From 705b89f19fff03054f7167e1785461492688d61b Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Wed, 15 Apr 2020 15:45:02 -0400
Subject: yylex: Make lexer fatal errors actually be fatal

When presented with a command that can't be tokenized to anything
smaller than YYLMAX characters, the parser calls YY_FATAL_ERROR(errmsg),
expecting that will stop further processing, as such:

  #define YY_DO_BEFORE_ACTION \
        yyg->yytext_ptr = yy_bp; \
        yyleng = (int) (yy_cp - yy_bp); \
        yyg->yy_hold_char = *yy_cp; \
        *yy_cp = '\0'; \
        if ( yyleng >= YYLMAX ) \
                YY_FATAL_ERROR( "token too large, exceeds YYLMAX" ); \
        yy_flex_strncpy( yytext, yyg->yytext_ptr, yyleng + 1 , yyscanner); \
        yyg->yy_c_buf_p = yy_cp;

The code flex generates expects that YY_FATAL_ERROR() will either return
for it or do some form of longjmp(), or handle the error in some way at
least, and so the strncpy() call isn't in an "else" clause, and thus if
YY_FATAL_ERROR() is *not* actually fatal, it does the call with the
questionable limit, and predictable results ensue.

Unfortunately, our implementation of YY_FATAL_ERROR() is:

   #define YY_FATAL_ERROR(msg)                     \
     do {                                          \
       grub_printf (_("fatal error: %s\n"), _(msg));     \
     } while (0)

The same pattern exists in yyless(), and similar problems exist in users
of YY_INPUT(), several places in the main parsing loop,
yy_get_next_buffer(), yy_load_buffer_state(), yyensure_buffer_stack,
yy_scan_buffer(), etc.

All of these callers expect YY_FATAL_ERROR() to actually be fatal, and
the things they do if it returns after calling it are wildly unsafe.

Fixes: CVE-2020-10713

Signed-off-by: Peter Jones <pjones@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/script/yylex.l | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/grub-core/script/yylex.l b/grub-core/script/yylex.l
index 7b44c37b7..b7203c823 100644
--- a/grub-core/script/yylex.l
+++ b/grub-core/script/yylex.l
@@ -37,11 +37,11 @@
 
 /* 
  * As we don't have access to yyscanner, we cannot do much except to
- * print the fatal error.
+ * print the fatal error and exit.
  */
 #define YY_FATAL_ERROR(msg)                     \
   do {                                          \
-    grub_printf (_("fatal error: %s\n"), _(msg));     \
+    grub_fatal (_("fatal error: %s\n"), _(msg));\
   } while (0)
 
 #define COPY(str, hint)                         \

From 016977edbd5d9f6fbab6412fb8b4d1f50eb432e7 Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Mon, 15 Jun 2020 10:58:42 -0400
Subject: safemath: Add some arithmetic primitives that check for
 overflow

This adds a new header, include/grub/safemath.h, that includes easy to
use wrappers for __builtin_{add,sub,mul}_overflow() declared like:

  bool OP(a, b, res)

where OP is grub_add, grub_sub or grub_mul. OP() returns true in the
case where the operation would overflow and res is not modified.
Otherwise, false is returned and the operation is executed.

These arithmetic primitives require newer compiler versions. So, bump
these requirements in the INSTALL file too.

Signed-off-by: Peter Jones <pjones@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 INSTALL                 | 22 ++--------------------
 include/grub/compiler.h |  8 ++++++++
 include/grub/safemath.h | 37 +++++++++++++++++++++++++++++++++++++
 3 files changed, 47 insertions(+), 20 deletions(-)
 create mode 100644 include/grub/safemath.h

diff --git a/INSTALL b/INSTALL
index 342c158e9..991479b52 100644
--- a/INSTALL
+++ b/INSTALL
@@ -11,27 +11,9 @@ GRUB depends on some software packages installed into your system. If
 you don't have any of them, please obtain and install them before
 configuring the GRUB.
 
-* GCC 4.1.3 or later
-  Note: older versions may work but support is limited
-
-  Experimental support for clang 3.3 or later (results in much bigger binaries)
+* GCC 5.1.0 or later
+  Experimental support for clang 3.8.0 or later (results in much bigger binaries)
   for i386, x86_64, arm (including thumb), arm64, mips(el), powerpc, sparc64
-  Note: clang 3.2 or later works for i386 and x86_64 targets but results in
-        much bigger binaries.
-	earlier versions not tested
-  Note: clang 3.2 or later works for arm
-	earlier versions not tested
-  Note: clang on arm64 is not supported due to
-	https://llvm.org/bugs/show_bug.cgi?id=26030
-  Note: clang 3.3 or later works for mips(el)
-	earlier versions fail to generate .reginfo and hence gprel relocations
-	fail.
-  Note: clang 3.2 or later works for powerpc
-	earlier versions not tested
-  Note: clang 3.5 or later works for sparc64
-        earlier versions return "error: unable to interface with target machine"
-  Note: clang has no support for ia64 and hence you can't compile GRUB
-	for ia64 with clang
 * GNU Make
 * GNU Bison 2.3 or later
 * GNU gettext 0.17 or later
diff --git a/include/grub/compiler.h b/include/grub/compiler.h
index c9e1d7a73..8f3be3ae7 100644
--- a/include/grub/compiler.h
+++ b/include/grub/compiler.h
@@ -48,4 +48,12 @@
 #  define WARN_UNUSED_RESULT
 #endif
 
+#if defined(__clang__) && defined(__clang_major__) && defined(__clang_minor__)
+#  define CLANG_PREREQ(maj,min) \
+          ((__clang_major__ > (maj)) || \
+	   (__clang_major__ == (maj) && __clang_minor__ >= (min)))
+#else
+#  define CLANG_PREREQ(maj,min) 0
+#endif
+
 #endif /* ! GRUB_COMPILER_HEADER */
diff --git a/include/grub/safemath.h b/include/grub/safemath.h
new file mode 100644
index 000000000..c17b89bba
--- /dev/null
+++ b/include/grub/safemath.h
@@ -0,0 +1,37 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2020  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *  Arithmetic operations that protect against overflow.
+ */
+
+#ifndef GRUB_SAFEMATH_H
+#define GRUB_SAFEMATH_H 1
+
+#include <grub/compiler.h>
+
+/* These appear in gcc 5.1 and clang 3.8. */
+#if GNUC_PREREQ(5, 1) || CLANG_PREREQ(3, 8)
+
+#define grub_add(a, b, res)	__builtin_add_overflow(a, b, res)
+#define grub_sub(a, b, res)	__builtin_sub_overflow(a, b, res)
+#define grub_mul(a, b, res)	__builtin_mul_overflow(a, b, res)
+
+#else
+#error gcc 5.1 or newer or clang 3.8 or newer is required
+#endif
+
+#endif /* GRUB_SAFEMATH_H */

From f80ca28e207484650fc7634545cd3dc6037de3c8 Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Mon, 15 Jun 2020 12:15:29 -0400
Subject: calloc: Make sure we always have an overflow-checking
 calloc() available

This tries to make sure that everywhere in this source tree, we always have
an appropriate version of calloc() (i.e. grub_calloc(), xcalloc(), etc.)
available, and that they all safely check for overflow and return NULL when
it would occur.

Signed-off-by: Peter Jones <pjones@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/kern/emu/misc.c          | 12 +++++++++
 grub-core/kern/emu/mm.c            | 10 ++++++++
 grub-core/kern/mm.c                | 40 ++++++++++++++++++++++++++++++
 grub-core/lib/libgcrypt_wrap/mem.c | 11 ++++++--
 grub-core/lib/posix_wrap/stdlib.h  |  8 +++++-
 include/grub/emu/misc.h            |  1 +
 include/grub/mm.h                  |  6 +++++
 7 files changed, 85 insertions(+), 3 deletions(-)

diff --git a/grub-core/kern/emu/misc.c b/grub-core/kern/emu/misc.c
index 65db79baa..dfd8a8ec4 100644
--- a/grub-core/kern/emu/misc.c
+++ b/grub-core/kern/emu/misc.c
@@ -85,6 +85,18 @@ grub_util_error (const char *fmt, ...)
   exit (1);
 }
 
+void *
+xcalloc (grub_size_t nmemb, grub_size_t size)
+{
+  void *p;
+
+  p = calloc (nmemb, size);
+  if (!p)
+    grub_util_error ("%s", _("out of memory"));
+
+  return p;
+}
+
 void *
 xmalloc (grub_size_t size)
 {
diff --git a/grub-core/kern/emu/mm.c b/grub-core/kern/emu/mm.c
index f262e95e3..145b01d37 100644
--- a/grub-core/kern/emu/mm.c
+++ b/grub-core/kern/emu/mm.c
@@ -25,6 +25,16 @@
 #include <string.h>
 #include <grub/i18n.h>
 
+void *
+grub_calloc (grub_size_t nmemb, grub_size_t size)
+{
+  void *ret;
+  ret = calloc (nmemb, size);
+  if (!ret)
+    grub_error (GRUB_ERR_OUT_OF_MEMORY, N_("out of memory"));
+  return ret;
+}
+
 void *
 grub_malloc (grub_size_t size)
 {
diff --git a/grub-core/kern/mm.c b/grub-core/kern/mm.c
index ee88ff611..f2822a836 100644
--- a/grub-core/kern/mm.c
+++ b/grub-core/kern/mm.c
@@ -67,8 +67,10 @@
 #include <grub/dl.h>
 #include <grub/i18n.h>
 #include <grub/mm_private.h>
+#include <grub/safemath.h>
 
 #ifdef MM_DEBUG
+# undef grub_calloc
 # undef grub_malloc
 # undef grub_zalloc
 # undef grub_realloc
@@ -375,6 +377,30 @@ grub_memalign (grub_size_t align, grub_size_t size)
   return 0;
 }
 
+/*
+ * Allocate NMEMB instances of SIZE bytes and return the pointer, or error on
+ * integer overflow.
+ */
+void *
+grub_calloc (grub_size_t nmemb, grub_size_t size)
+{
+  void *ret;
+  grub_size_t sz = 0;
+
+  if (grub_mul (nmemb, size, &sz))
+    {
+      grub_error (GRUB_ERR_OUT_OF_RANGE, N_("overflow is detected"));
+      return NULL;
+    }
+
+  ret = grub_memalign (0, sz);
+  if (!ret)
+    return NULL;
+
+  grub_memset (ret, 0, sz);
+  return ret;
+}
+
 /* Allocate SIZE bytes and return the pointer.  */
 void *
 grub_malloc (grub_size_t size)
@@ -561,6 +587,20 @@ grub_mm_dump (unsigned lineno)
   grub_printf ("\n");
 }
 
+void *
+grub_debug_calloc (const char *file, int line, grub_size_t nmemb, grub_size_t size)
+{
+  void *ptr;
+
+  if (grub_mm_debug)
+    grub_printf ("%s:%d: calloc (0x%" PRIxGRUB_SIZE ", 0x%" PRIxGRUB_SIZE ") = ",
+		 file, line, size);
+  ptr = grub_calloc (nmemb, size);
+  if (grub_mm_debug)
+    grub_printf ("%p\n", ptr);
+  return ptr;
+}
+
 void *
 grub_debug_malloc (const char *file, int line, grub_size_t size)
 {
diff --git a/grub-core/lib/libgcrypt_wrap/mem.c b/grub-core/lib/libgcrypt_wrap/mem.c
index beeb661a3..74c6eafe5 100644
--- a/grub-core/lib/libgcrypt_wrap/mem.c
+++ b/grub-core/lib/libgcrypt_wrap/mem.c
@@ -4,6 +4,7 @@
 #include <grub/crypto.h>
 #include <grub/dl.h>
 #include <grub/env.h>
+#include <grub/safemath.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
@@ -36,7 +37,10 @@ void *
 gcry_xcalloc (size_t n, size_t m)
 {
   void *ret;
-  ret = grub_zalloc (n * m);
+  size_t sz;
+  if (grub_mul (n, m, &sz))
+    grub_fatal ("gcry_xcalloc would overflow");
+  ret = grub_zalloc (sz);
   if (!ret)
     grub_fatal ("gcry_xcalloc failed");
   return ret;
@@ -56,7 +60,10 @@ void *
 gcry_xcalloc_secure (size_t n, size_t m)
 {
   void *ret;
-  ret = grub_zalloc (n * m);
+  size_t sz;
+  if (grub_mul (n, m, &sz))
+    grub_fatal ("gcry_xcalloc would overflow");
+  ret = grub_zalloc (sz);
   if (!ret)
     grub_fatal ("gcry_xcalloc failed");
   return ret;
diff --git a/grub-core/lib/posix_wrap/stdlib.h b/grub-core/lib/posix_wrap/stdlib.h
index 3b46f47ff..7a8d385e9 100644
--- a/grub-core/lib/posix_wrap/stdlib.h
+++ b/grub-core/lib/posix_wrap/stdlib.h
@@ -21,6 +21,7 @@
 
 #include <grub/mm.h>
 #include <grub/misc.h>
+#include <grub/safemath.h>
 
 static inline void 
 free (void *ptr)
@@ -37,7 +38,12 @@ malloc (grub_size_t size)
 static inline void *
 calloc (grub_size_t size, grub_size_t nelem)
 {
-  return grub_zalloc (size * nelem);
+  grub_size_t sz;
+
+  if (grub_mul (size, nelem, &sz))
+    return NULL;
+
+  return grub_zalloc (sz);
 }
 
 static inline void *
diff --git a/include/grub/emu/misc.h b/include/grub/emu/misc.h
index ce464cfd0..ff9c48a64 100644
--- a/include/grub/emu/misc.h
+++ b/include/grub/emu/misc.h
@@ -47,6 +47,7 @@ grub_util_device_is_mapped (const char *dev);
 #define GRUB_HOST_PRIuLONG_LONG "llu"
 #define GRUB_HOST_PRIxLONG_LONG "llx"
 
+void * EXPORT_FUNC(xcalloc) (grub_size_t nmemb, grub_size_t size) WARN_UNUSED_RESULT;
 void * EXPORT_FUNC(xmalloc) (grub_size_t size) WARN_UNUSED_RESULT;
 void * EXPORT_FUNC(xrealloc) (void *ptr, grub_size_t size) WARN_UNUSED_RESULT;
 char * EXPORT_FUNC(xstrdup) (const char *str) WARN_UNUSED_RESULT;
diff --git a/include/grub/mm.h b/include/grub/mm.h
index 28e2e53eb..9c38dd3ca 100644
--- a/include/grub/mm.h
+++ b/include/grub/mm.h
@@ -29,6 +29,7 @@
 #endif
 
 void grub_mm_init_region (void *addr, grub_size_t size);
+void *EXPORT_FUNC(grub_calloc) (grub_size_t nmemb, grub_size_t size);
 void *EXPORT_FUNC(grub_malloc) (grub_size_t size);
 void *EXPORT_FUNC(grub_zalloc) (grub_size_t size);
 void EXPORT_FUNC(grub_free) (void *ptr);
@@ -48,6 +49,9 @@ extern int EXPORT_VAR(grub_mm_debug);
 void grub_mm_dump_free (void);
 void grub_mm_dump (unsigned lineno);
 
+#define grub_calloc(nmemb, size)	\
+  grub_debug_calloc (GRUB_FILE, __LINE__, nmemb, size)
+
 #define grub_malloc(size)	\
   grub_debug_malloc (GRUB_FILE, __LINE__, size)
 
@@ -63,6 +67,8 @@ void grub_mm_dump (unsigned lineno);
 #define grub_free(ptr)	\
   grub_debug_free (GRUB_FILE, __LINE__, ptr)
 
+void *EXPORT_FUNC(grub_debug_calloc) (const char *file, int line,
+				      grub_size_t nmemb, grub_size_t size);
 void *EXPORT_FUNC(grub_debug_malloc) (const char *file, int line,
 				      grub_size_t size);
 void *EXPORT_FUNC(grub_debug_zalloc) (const char *file, int line,

From 65dfa11751111173ce6f492afce13d4a2c2b006c Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Mon, 15 Jun 2020 12:26:01 -0400
Subject: calloc: Use calloc() at most places

This modifies most of the places we do some form of:

  X = malloc(Y * Z);

to use calloc(Y, Z) instead.

Among other issues, this fixes:
  - allocation of integer overflow in grub_png_decode_image_header()
    reported by Chris Coulson,
  - allocation of integer overflow in luks_recover_key()
    reported by Chris Coulson,
  - allocation of integer overflow in grub_lvm_detect()
    reported by Chris Coulson.

Fixes: CVE-2020-14308

Signed-off-by: Peter Jones <pjones@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/bus/usb/usbhub.c                |  8 ++++----
 grub-core/commands/efi/lsefisystab.c      |  3 ++-
 grub-core/commands/legacycfg.c            |  6 +++---
 grub-core/commands/menuentry.c            |  2 +-
 grub-core/commands/nativedisk.c           |  2 +-
 grub-core/commands/parttool.c             | 12 +++++++++---
 grub-core/commands/regexp.c               |  2 +-
 grub-core/commands/search_wrap.c          |  2 +-
 grub-core/disk/diskfilter.c               |  4 ++--
 grub-core/disk/ieee1275/ofdisk.c          |  2 +-
 grub-core/disk/ldm.c                      | 14 +++++++-------
 grub-core/disk/luks.c                     |  2 +-
 grub-core/disk/lvm.c                      |  8 ++++----
 grub-core/disk/xen/xendisk.c              |  2 +-
 grub-core/efiemu/loadcore.c               |  2 +-
 grub-core/efiemu/mm.c                     |  6 +++---
 grub-core/font/font.c                     |  3 +--
 grub-core/fs/affs.c                       |  6 +++---
 grub-core/fs/btrfs.c                      |  6 +++---
 grub-core/fs/hfs.c                        |  2 +-
 grub-core/fs/hfsplus.c                    |  6 +++---
 grub-core/fs/iso9660.c                    |  2 +-
 grub-core/fs/ntfs.c                       |  4 ++--
 grub-core/fs/sfs.c                        |  2 +-
 grub-core/fs/tar.c                        |  2 +-
 grub-core/fs/udf.c                        |  4 ++--
 grub-core/fs/zfs/zfs.c                    |  4 ++--
 grub-core/gfxmenu/gui_string_util.c       |  2 +-
 grub-core/gfxmenu/widget-box.c            |  4 ++--
 grub-core/io/gzio.c                       |  2 +-
 grub-core/kern/efi/efi.c                  |  6 +++---
 grub-core/kern/emu/hostdisk.c             |  2 +-
 grub-core/kern/fs.c                       |  2 +-
 grub-core/kern/misc.c                     |  2 +-
 grub-core/kern/parser.c                   |  2 +-
 grub-core/kern/uboot/uboot.c              |  2 +-
 grub-core/lib/libgcrypt/cipher/ac.c       |  8 ++++----
 grub-core/lib/libgcrypt/cipher/primegen.c |  4 ++--
 grub-core/lib/libgcrypt/cipher/pubkey.c   |  4 ++--
 grub-core/lib/priority_queue.c            |  2 +-
 grub-core/lib/reed_solomon.c              |  7 +++----
 grub-core/lib/relocator.c                 | 10 +++++-----
 grub-core/lib/zstd/fse_decompress.c       |  2 +-
 grub-core/loader/arm/linux.c              |  2 +-
 grub-core/loader/efi/chainloader.c        |  2 +-
 grub-core/loader/i386/bsdXX.c             |  2 +-
 grub-core/loader/i386/xnu.c               |  4 ++--
 grub-core/loader/macho.c                  |  2 +-
 grub-core/loader/multiboot_elfxx.c        |  2 +-
 grub-core/loader/xnu.c                    |  2 +-
 grub-core/mmap/mmap.c                     |  4 ++--
 grub-core/net/bootp.c                     |  2 +-
 grub-core/net/dns.c                       | 10 +++++-----
 grub-core/net/net.c                       |  4 ++--
 grub-core/normal/charset.c                | 10 +++++-----
 grub-core/normal/cmdline.c                | 14 +++++++-------
 grub-core/normal/menu_entry.c             | 14 +++++++-------
 grub-core/normal/menu_text.c              |  4 ++--
 grub-core/normal/term.c                   |  4 ++--
 grub-core/osdep/linux/getroot.c           |  6 +++---
 grub-core/osdep/windows/getroot.c         |  2 +-
 grub-core/osdep/windows/hostdisk.c        |  4 ++--
 grub-core/osdep/windows/init.c            |  2 +-
 grub-core/osdep/windows/platform.c        |  4 ++--
 grub-core/osdep/windows/relpath.c         |  2 +-
 grub-core/partmap/gpt.c                   |  2 +-
 grub-core/partmap/msdos.c                 |  2 +-
 grub-core/script/execute.c                |  2 +-
 grub-core/tests/fake_input.c              |  2 +-
 grub-core/tests/video_checksum.c          |  6 +++---
 grub-core/video/capture.c                 |  2 +-
 grub-core/video/emu/sdl.c                 |  2 +-
 grub-core/video/i386/pc/vga.c             |  2 +-
 grub-core/video/readers/png.c             |  2 +-
 include/grub/unicode.h                    |  4 ++--
 util/getroot.c                            |  2 +-
 util/grub-file.c                          |  2 +-
 util/grub-fstest.c                        |  4 ++--
 util/grub-install-common.c                |  2 +-
 util/grub-install.c                       |  4 ++--
 util/grub-mkimagexx.c                     |  6 ++----
 util/grub-mkrescue.c                      |  4 ++--
 util/grub-mkstandalone.c                  |  2 +-
 util/grub-pe2elf.c                        | 12 +++++-------
 util/grub-probe.c                         |  4 ++--
 85 files changed, 175 insertions(+), 174 deletions(-)

diff --git a/grub-core/bus/usb/usbhub.c b/grub-core/bus/usb/usbhub.c
index 34a7ff1b5..a06cce302 100644
--- a/grub-core/bus/usb/usbhub.c
+++ b/grub-core/bus/usb/usbhub.c
@@ -149,8 +149,8 @@ grub_usb_add_hub (grub_usb_device_t dev)
   grub_usb_set_configuration (dev, 1);
 
   dev->nports = hubdesc.portcnt;
-  dev->children = grub_zalloc (hubdesc.portcnt * sizeof (dev->children[0]));
-  dev->ports = grub_zalloc (dev->nports * sizeof (dev->ports[0]));
+  dev->children = grub_calloc (hubdesc.portcnt, sizeof (dev->children[0]));
+  dev->ports = grub_calloc (dev->nports, sizeof (dev->ports[0]));
   if (!dev->children || !dev->ports)
     {
       grub_free (dev->children);
@@ -268,8 +268,8 @@ grub_usb_controller_dev_register_iter (grub_usb_controller_t controller, void *d
 
   /* Query the number of ports the root Hub has.  */
   hub->nports = controller->dev->hubports (controller);
-  hub->devices = grub_zalloc (sizeof (hub->devices[0]) * hub->nports);
-  hub->ports = grub_zalloc (sizeof (hub->ports[0]) * hub->nports);
+  hub->devices = grub_calloc (hub->nports, sizeof (hub->devices[0]));
+  hub->ports = grub_calloc (hub->nports, sizeof (hub->ports[0]));
   if (!hub->devices || !hub->ports)
     {
       grub_free (hub->devices);
diff --git a/grub-core/commands/efi/lsefisystab.c b/grub-core/commands/efi/lsefisystab.c
index df1030221..cd81507f5 100644
--- a/grub-core/commands/efi/lsefisystab.c
+++ b/grub-core/commands/efi/lsefisystab.c
@@ -71,7 +71,8 @@ grub_cmd_lsefisystab (struct grub_command *cmd __attribute__ ((unused)),
     grub_printf ("Vendor: ");
     
     for (vendor_utf16 = st->firmware_vendor; *vendor_utf16; vendor_utf16++);
-    vendor = grub_malloc (4 * (vendor_utf16 - st->firmware_vendor) + 1);
+    /* Allocate extra 3 bytes to simplify math. */
+    vendor = grub_calloc (4, vendor_utf16 - st->firmware_vendor + 1);
     if (!vendor)
       return grub_errno;
     *grub_utf16_to_utf8 ((grub_uint8_t *) vendor, st->firmware_vendor,
diff --git a/grub-core/commands/legacycfg.c b/grub-core/commands/legacycfg.c
index db7a8f002..5e3ec0d5e 100644
--- a/grub-core/commands/legacycfg.c
+++ b/grub-core/commands/legacycfg.c
@@ -314,7 +314,7 @@ grub_cmd_legacy_kernel (struct grub_command *mycmd __attribute__ ((unused)),
   if (argc < 2)
     return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
 
-  cutargs = grub_malloc (sizeof (cutargs[0]) * (argc - 1));
+  cutargs = grub_calloc (argc - 1, sizeof (cutargs[0]));
   if (!cutargs)
     return grub_errno;
   cutargc = argc - 1;
@@ -436,7 +436,7 @@ grub_cmd_legacy_kernel (struct grub_command *mycmd __attribute__ ((unused)),
 	    {
 	      char rbuf[3] = "-r";
 	      bsdargc = cutargc + 2;
-	      bsdargs = grub_malloc (sizeof (bsdargs[0]) * bsdargc);
+	      bsdargs = grub_calloc (bsdargc, sizeof (bsdargs[0]));
 	      if (!bsdargs)
 		{
 		  err = grub_errno;
@@ -559,7 +559,7 @@ grub_cmd_legacy_initrdnounzip (struct grub_command *mycmd __attribute__ ((unused
 	return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("can't find command `%s'"),
 			   "module");
 
-      newargs = grub_malloc ((argc + 1) * sizeof (newargs[0]));
+      newargs = grub_calloc (argc + 1, sizeof (newargs[0]));
       if (!newargs)
 	return grub_errno;
       grub_memcpy (newargs + 1, args, argc * sizeof (newargs[0]));
diff --git a/grub-core/commands/menuentry.c b/grub-core/commands/menuentry.c
index 2c5363da7..9164df744 100644
--- a/grub-core/commands/menuentry.c
+++ b/grub-core/commands/menuentry.c
@@ -154,7 +154,7 @@ grub_normal_add_menu_entry (int argc, const char **args,
     goto fail;
 
   /* Save argc, args to pass as parameters to block arg later. */
-  menu_args = grub_malloc (sizeof (char*) * (argc + 1));
+  menu_args = grub_calloc (argc + 1, sizeof (char *));
   if (! menu_args)
     goto fail;
 
diff --git a/grub-core/commands/nativedisk.c b/grub-core/commands/nativedisk.c
index 699447d11..7c8f97f6a 100644
--- a/grub-core/commands/nativedisk.c
+++ b/grub-core/commands/nativedisk.c
@@ -195,7 +195,7 @@ grub_cmd_nativedisk (grub_command_t cmd __attribute__ ((unused)),
   else
     path_prefix = prefix;
 
-  mods = grub_malloc (argc * sizeof (mods[0]));
+  mods = grub_calloc (argc, sizeof (mods[0]));
   if (!mods)
     return grub_errno;
 
diff --git a/grub-core/commands/parttool.c b/grub-core/commands/parttool.c
index 22b46b187..051e31320 100644
--- a/grub-core/commands/parttool.c
+++ b/grub-core/commands/parttool.c
@@ -59,7 +59,13 @@ grub_parttool_register(const char *part_name,
   for (nargs = 0; args[nargs].name != 0; nargs++);
   cur->nargs = nargs;
   cur->args = (struct grub_parttool_argdesc *)
-    grub_malloc ((nargs + 1) * sizeof (struct grub_parttool_argdesc));
+    grub_calloc (nargs + 1, sizeof (struct grub_parttool_argdesc));
+  if (!cur->args)
+    {
+      grub_free (cur);
+      curhandle--;
+      return -1;
+    }
   grub_memcpy (cur->args, args,
 	       (nargs + 1) * sizeof (struct grub_parttool_argdesc));
 
@@ -257,7 +263,7 @@ grub_cmd_parttool (grub_command_t cmd __attribute__ ((unused)),
 	return err;
       }
 
-  parsed = (int *) grub_zalloc (argc * sizeof (int));
+  parsed = (int *) grub_calloc (argc, sizeof (int));
 
   for (i = 1; i < argc; i++)
     if (! parsed[i])
@@ -290,7 +296,7 @@ grub_cmd_parttool (grub_command_t cmd __attribute__ ((unused)),
 	  }
 	ptool = cur;
 	pargs = (struct grub_parttool_args *)
-	  grub_zalloc (ptool->nargs * sizeof (struct grub_parttool_args));
+	  grub_calloc (ptool->nargs, sizeof (struct grub_parttool_args));
 	for (j = i; j < argc; j++)
 	  if (! parsed[j])
 	    {
diff --git a/grub-core/commands/regexp.c b/grub-core/commands/regexp.c
index f00b184c8..4019164f3 100644
--- a/grub-core/commands/regexp.c
+++ b/grub-core/commands/regexp.c
@@ -116,7 +116,7 @@ grub_cmd_regexp (grub_extcmd_context_t ctxt, int argc, char **args)
   if (ret)
     goto fail;
 
-  matches = grub_zalloc (sizeof (*matches) * (regex.re_nsub + 1));
+  matches = grub_calloc (regex.re_nsub + 1, sizeof (*matches));
   if (! matches)
     goto fail;
 
diff --git a/grub-core/commands/search_wrap.c b/grub-core/commands/search_wrap.c
index d7fd26b94..47fc8eb99 100644
--- a/grub-core/commands/search_wrap.c
+++ b/grub-core/commands/search_wrap.c
@@ -122,7 +122,7 @@ grub_cmd_search (grub_extcmd_context_t ctxt, int argc, char **args)
     for (i = 0; state[SEARCH_HINT_BAREMETAL].args[i]; i++)
       nhints++;
 
-  hints = grub_malloc (sizeof (hints[0]) * nhints);
+  hints = grub_calloc (nhints, sizeof (hints[0]));
   if (!hints)
     return grub_errno;
   j = 0;
diff --git a/grub-core/disk/diskfilter.c b/grub-core/disk/diskfilter.c
index c3b578acf..68ca9e0be 100644
--- a/grub-core/disk/diskfilter.c
+++ b/grub-core/disk/diskfilter.c
@@ -1134,7 +1134,7 @@ grub_diskfilter_make_raid (grub_size_t uuidlen, char *uuid, int nmemb,
   array->lvs->segments->node_count = nmemb;
   array->lvs->segments->raid_member_size = disk_size;
   array->lvs->segments->nodes
-    = grub_zalloc (nmemb * sizeof (array->lvs->segments->nodes[0]));
+    = grub_calloc (nmemb, sizeof (array->lvs->segments->nodes[0]));
   array->lvs->segments->stripe_size = stripe_size;
   for (i = 0; i < nmemb; i++)
     {
@@ -1226,7 +1226,7 @@ insert_array (grub_disk_t disk, const struct grub_diskfilter_pv_id *id,
 	  grub_partition_t p;
 	  for (p = disk->partition; p; p = p->parent)
 	    s++;
-	  pv->partmaps = xmalloc (s * sizeof (pv->partmaps[0]));
+	  pv->partmaps = xcalloc (s, sizeof (pv->partmaps[0]));
 	  s = 0;
 	  for (p = disk->partition; p; p = p->parent)
 	    pv->partmaps[s++] = xstrdup (p->partmap->name);
diff --git a/grub-core/disk/ieee1275/ofdisk.c b/grub-core/disk/ieee1275/ofdisk.c
index f73257e66..03674cb47 100644
--- a/grub-core/disk/ieee1275/ofdisk.c
+++ b/grub-core/disk/ieee1275/ofdisk.c
@@ -297,7 +297,7 @@ dev_iterate (const struct grub_ieee1275_devalias *alias)
       /* Power machines documentation specify 672 as maximum SAS disks in
          one system. Using a slightly larger value to be safe. */
       table_size = 768;
-      table = grub_malloc (table_size * sizeof (grub_uint64_t));
+      table = grub_calloc (table_size, sizeof (grub_uint64_t));
 
       if (!table)
         {
diff --git a/grub-core/disk/ldm.c b/grub-core/disk/ldm.c
index 2a22d2d6c..e6323701a 100644
--- a/grub-core/disk/ldm.c
+++ b/grub-core/disk/ldm.c
@@ -323,8 +323,8 @@ make_vg (grub_disk_t disk,
 	  lv->segments->type = GRUB_DISKFILTER_MIRROR;
 	  lv->segments->node_count = 0;
 	  lv->segments->node_alloc = 8;
-	  lv->segments->nodes = grub_zalloc (sizeof (*lv->segments->nodes)
-					     * lv->segments->node_alloc);
+	  lv->segments->nodes = grub_calloc (lv->segments->node_alloc,
+					     sizeof (*lv->segments->nodes));
 	  if (!lv->segments->nodes)
 	    goto fail2;
 	  ptr = vblk[i].dynamic;
@@ -543,8 +543,8 @@ make_vg (grub_disk_t disk,
 	    {
 	      comp->segment_alloc = 8;
 	      comp->segment_count = 0;
-	      comp->segments = grub_malloc (sizeof (*comp->segments)
-					    * comp->segment_alloc);
+	      comp->segments = grub_calloc (comp->segment_alloc,
+					    sizeof (*comp->segments));
 	      if (!comp->segments)
 		goto fail2;
 	    }
@@ -590,8 +590,8 @@ make_vg (grub_disk_t disk,
 		}
 	      comp->segments->node_count = read_int (ptr + 1, *ptr);
 	      comp->segments->node_alloc = comp->segments->node_count;
-	      comp->segments->nodes = grub_zalloc (sizeof (*comp->segments->nodes)
-						   * comp->segments->node_alloc);
+	      comp->segments->nodes = grub_calloc (comp->segments->node_alloc,
+						   sizeof (*comp->segments->nodes));
 	      if (!lv->segments->nodes)
 		goto fail2;
 	    }
@@ -1017,7 +1017,7 @@ grub_util_ldm_embed (struct grub_disk *disk, unsigned int *nsectors,
       *nsectors = lv->size;
       if (*nsectors > max_nsectors)
 	*nsectors = max_nsectors;
-      *sectors = grub_malloc (*nsectors * sizeof (**sectors));
+      *sectors = grub_calloc (*nsectors, sizeof (**sectors));
       if (!*sectors)
 	return grub_errno;
       for (i = 0; i < *nsectors; i++)
diff --git a/grub-core/disk/luks.c b/grub-core/disk/luks.c
index 86c50c612..18b3a8bb1 100644
--- a/grub-core/disk/luks.c
+++ b/grub-core/disk/luks.c
@@ -336,7 +336,7 @@ luks_recover_key (grub_disk_t source,
 	&& grub_be_to_cpu32 (header.keyblock[i].stripes) > max_stripes)
       max_stripes = grub_be_to_cpu32 (header.keyblock[i].stripes);
 
-  split_key = grub_malloc (keysize * max_stripes);
+  split_key = grub_calloc (keysize, max_stripes);
   if (!split_key)
     return grub_errno;
 
diff --git a/grub-core/disk/lvm.c b/grub-core/disk/lvm.c
index 7b265c780..d1df640b3 100644
--- a/grub-core/disk/lvm.c
+++ b/grub-core/disk/lvm.c
@@ -173,7 +173,7 @@ grub_lvm_detect (grub_disk_t disk,
      first one.  */
 
   /* Allocate buffer space for the circular worst-case scenario. */
-  metadatabuf = grub_malloc (2 * mda_size);
+  metadatabuf = grub_calloc (2, mda_size);
   if (! metadatabuf)
     goto fail;
 
@@ -426,7 +426,7 @@ grub_lvm_detect (grub_disk_t disk,
 #endif
 		  goto lvs_fail;
 		}
-	      lv->segments = grub_zalloc (sizeof (*seg) * lv->segment_count);
+	      lv->segments = grub_calloc (lv->segment_count, sizeof (*seg));
 	      seg = lv->segments;
 
 	      for (i = 0; i < lv->segment_count; i++)
@@ -483,8 +483,8 @@ grub_lvm_detect (grub_disk_t disk,
 		      if (seg->node_count != 1)
 			seg->stripe_size = grub_lvm_getvalue (&p, "stripe_size = ");
 
-		      seg->nodes = grub_zalloc (sizeof (*stripe)
-						* seg->node_count);
+		      seg->nodes = grub_calloc (seg->node_count,
+						sizeof (*stripe));
 		      stripe = seg->nodes;
 
 		      p = grub_strstr (p, "stripes = [");
diff --git a/grub-core/disk/xen/xendisk.c b/grub-core/disk/xen/xendisk.c
index 48476cbbf..d6612eebd 100644
--- a/grub-core/disk/xen/xendisk.c
+++ b/grub-core/disk/xen/xendisk.c
@@ -426,7 +426,7 @@ grub_xendisk_init (void)
   if (!ctr)
     return;
 
-  virtdisks = grub_malloc (ctr * sizeof (virtdisks[0]));
+  virtdisks = grub_calloc (ctr, sizeof (virtdisks[0]));
   if (!virtdisks)
     return;
   if (grub_xenstore_dir ("device/vbd", fill, &ctr))
diff --git a/grub-core/efiemu/loadcore.c b/grub-core/efiemu/loadcore.c
index 44085ef81..2b924623f 100644
--- a/grub-core/efiemu/loadcore.c
+++ b/grub-core/efiemu/loadcore.c
@@ -201,7 +201,7 @@ grub_efiemu_count_symbols (const Elf_Ehdr *e)
 
   grub_efiemu_nelfsyms = (unsigned) s->sh_size / (unsigned) s->sh_entsize;
   grub_efiemu_elfsyms = (struct grub_efiemu_elf_sym *)
-    grub_malloc (sizeof (struct grub_efiemu_elf_sym) * grub_efiemu_nelfsyms);
+    grub_calloc (grub_efiemu_nelfsyms, sizeof (struct grub_efiemu_elf_sym));
 
   /* Relocators */
   for (i = 0, s = (Elf_Shdr *) ((char *) e + e->e_shoff);
diff --git a/grub-core/efiemu/mm.c b/grub-core/efiemu/mm.c
index 52a032f7b..9b8e0d0ad 100644
--- a/grub-core/efiemu/mm.c
+++ b/grub-core/efiemu/mm.c
@@ -554,11 +554,11 @@ grub_efiemu_mmap_sort_and_uniq (void)
   /* Initialize variables*/
   grub_memset (present, 0, sizeof (int) * GRUB_EFI_MAX_MEMORY_TYPE);
   scanline_events = (struct grub_efiemu_mmap_scan *)
-    grub_malloc (sizeof (struct grub_efiemu_mmap_scan) * 2 * mmap_num);
+    grub_calloc (mmap_num, sizeof (struct grub_efiemu_mmap_scan) * 2);
 
   /* Number of chunks can't increase more than by factor of 2 */
   result = (grub_efi_memory_descriptor_t *)
-    grub_malloc (sizeof (grub_efi_memory_descriptor_t) * 2 * mmap_num);
+    grub_calloc (mmap_num, sizeof (grub_efi_memory_descriptor_t) * 2);
   if (!result || !scanline_events)
     {
       grub_free (result);
@@ -660,7 +660,7 @@ grub_efiemu_mm_do_alloc (void)
 
   /* Preallocate mmap */
   efiemu_mmap = (grub_efi_memory_descriptor_t *)
-    grub_malloc (mmap_reserved_size * sizeof (grub_efi_memory_descriptor_t));
+    grub_calloc (mmap_reserved_size, sizeof (grub_efi_memory_descriptor_t));
   if (!efiemu_mmap)
     {
       grub_efiemu_unload ();
diff --git a/grub-core/font/font.c b/grub-core/font/font.c
index 85a292557..8e118b315 100644
--- a/grub-core/font/font.c
+++ b/grub-core/font/font.c
@@ -293,8 +293,7 @@ load_font_index (grub_file_t file, grub_uint32_t sect_length, struct
   font->num_chars = sect_length / FONT_CHAR_INDEX_ENTRY_SIZE;
 
   /* Allocate the character index array.  */
-  font->char_index = grub_malloc (font->num_chars
-				  * sizeof (struct char_index_entry));
+  font->char_index = grub_calloc (font->num_chars, sizeof (struct char_index_entry));
   if (!font->char_index)
     return 1;
   font->bmp_idx = grub_malloc (0x10000 * sizeof (grub_uint16_t));
diff --git a/grub-core/fs/affs.c b/grub-core/fs/affs.c
index 6b6a2bc91..220b3712f 100644
--- a/grub-core/fs/affs.c
+++ b/grub-core/fs/affs.c
@@ -301,7 +301,7 @@ grub_affs_read_symlink (grub_fshelp_node_t node)
       return 0;
     }
   latin1[symlink_size] = 0;
-  utf8 = grub_malloc (symlink_size * GRUB_MAX_UTF8_PER_LATIN1 + 1);
+  utf8 = grub_calloc (GRUB_MAX_UTF8_PER_LATIN1 + 1, symlink_size);
   if (!utf8)
     {
       grub_free (latin1);
@@ -422,7 +422,7 @@ grub_affs_iterate_dir (grub_fshelp_node_t dir,
 	return 1;
     }
 
-  hashtable = grub_zalloc (data->htsize * sizeof (*hashtable));
+  hashtable = grub_calloc (data->htsize, sizeof (*hashtable));
   if (!hashtable)
     return 1;
 
@@ -628,7 +628,7 @@ grub_affs_label (grub_device_t device, char **label)
       len = file.namelen;
       if (len > sizeof (file.name))
 	len = sizeof (file.name);
-      *label = grub_malloc (len * GRUB_MAX_UTF8_PER_LATIN1 + 1);
+      *label = grub_calloc (GRUB_MAX_UTF8_PER_LATIN1 + 1, len);
       if (*label)
 	*grub_latin1_to_utf8 ((grub_uint8_t *) *label, file.name, len) = '\0';
     }
diff --git a/grub-core/fs/btrfs.c b/grub-core/fs/btrfs.c
index 63f9657a6..4b8380439 100644
--- a/grub-core/fs/btrfs.c
+++ b/grub-core/fs/btrfs.c
@@ -415,7 +415,7 @@ lower_bound (struct grub_btrfs_data *data,
     {
       desc->allocated = 16;
       desc->depth = 0;
-      desc->data = grub_malloc (sizeof (desc->data[0]) * desc->allocated);
+      desc->data = grub_calloc (desc->allocated, sizeof (desc->data[0]));
       if (!desc->data)
 	return grub_errno;
     }
@@ -754,7 +754,7 @@ raid56_read_retry (struct grub_btrfs_data *data,
   grub_err_t ret = GRUB_ERR_OUT_OF_MEMORY;
   grub_uint64_t i, failed_devices;
 
-  buffers = grub_zalloc (sizeof(*buffers) * nstripes);
+  buffers = grub_calloc (nstripes, sizeof (*buffers));
   if (!buffers)
     goto cleanup;
 
@@ -2167,7 +2167,7 @@ grub_btrfs_embed (grub_device_t device __attribute__ ((unused)),
   *nsectors = 64 * 2 - 1;
   if (*nsectors > max_nsectors)
     *nsectors = max_nsectors;
-  *sectors = grub_malloc (*nsectors * sizeof (**sectors));
+  *sectors = grub_calloc (*nsectors, sizeof (**sectors));
   if (!*sectors)
     return grub_errno;
   for (i = 0; i < *nsectors; i++)
diff --git a/grub-core/fs/hfs.c b/grub-core/fs/hfs.c
index ac0a40990..3fe842b4d 100644
--- a/grub-core/fs/hfs.c
+++ b/grub-core/fs/hfs.c
@@ -1360,7 +1360,7 @@ grub_hfs_label (grub_device_t device, char **label)
       grub_size_t len = data->sblock.volname[0];
       if (len > sizeof (data->sblock.volname) - 1)
 	len = sizeof (data->sblock.volname) - 1;
-      *label = grub_malloc (len * MAX_UTF8_PER_MAC_ROMAN + 1);
+      *label = grub_calloc (MAX_UTF8_PER_MAC_ROMAN + 1, len);
       if (*label)
 	macroman_to_utf8 (*label, data->sblock.volname + 1,
 			  len + 1, 0);
diff --git a/grub-core/fs/hfsplus.c b/grub-core/fs/hfsplus.c
index 54786bb1c..dae43becc 100644
--- a/grub-core/fs/hfsplus.c
+++ b/grub-core/fs/hfsplus.c
@@ -720,7 +720,7 @@ list_nodes (void *record, void *hook_arg)
   if (! filename)
     return 0;
 
-  keyname = grub_malloc (grub_be_to_cpu16 (catkey->namelen) * sizeof (*keyname));
+  keyname = grub_calloc (grub_be_to_cpu16 (catkey->namelen), sizeof (*keyname));
   if (!keyname)
     {
       grub_free (filename);
@@ -1007,7 +1007,7 @@ grub_hfsplus_label (grub_device_t device, char **label)
     grub_hfsplus_btree_recptr (&data->catalog_tree, node, ptr);
 
   label_len = grub_be_to_cpu16 (catkey->namelen);
-  label_name = grub_malloc (label_len * sizeof (*label_name));
+  label_name = grub_calloc (label_len, sizeof (*label_name));
   if (!label_name)
     {
       grub_free (node);
@@ -1029,7 +1029,7 @@ grub_hfsplus_label (grub_device_t device, char **label)
 	}
     }
 
-  *label = grub_malloc (label_len * GRUB_MAX_UTF8_PER_UTF16 + 1);
+  *label = grub_calloc (label_len, GRUB_MAX_UTF8_PER_UTF16 + 1);
   if (! *label)
     {
       grub_free (label_name);
diff --git a/grub-core/fs/iso9660.c b/grub-core/fs/iso9660.c
index 49c0c632b..4f1b52a55 100644
--- a/grub-core/fs/iso9660.c
+++ b/grub-core/fs/iso9660.c
@@ -331,7 +331,7 @@ grub_iso9660_convert_string (grub_uint8_t *us, int len)
   int i;
   grub_uint16_t t[MAX_NAMELEN / 2 + 1];
 
-  p = grub_malloc (len * GRUB_MAX_UTF8_PER_UTF16 + 1);
+  p = grub_calloc (len, GRUB_MAX_UTF8_PER_UTF16 + 1);
   if (! p)
     return NULL;
 
diff --git a/grub-core/fs/ntfs.c b/grub-core/fs/ntfs.c
index fc4e1f678..2f34f76da 100644
--- a/grub-core/fs/ntfs.c
+++ b/grub-core/fs/ntfs.c
@@ -556,8 +556,8 @@ get_utf8 (grub_uint8_t *in, grub_size_t len)
   grub_uint16_t *tmp;
   grub_size_t i;
 
-  buf = grub_malloc (len * GRUB_MAX_UTF8_PER_UTF16 + 1);
-  tmp = grub_malloc (len * sizeof (tmp[0]));
+  buf = grub_calloc (len, GRUB_MAX_UTF8_PER_UTF16 + 1);
+  tmp = grub_calloc (len, sizeof (tmp[0]));
   if (!buf || !tmp)
     {
       grub_free (buf);
diff --git a/grub-core/fs/sfs.c b/grub-core/fs/sfs.c
index 50c1fe72f..90f7fb379 100644
--- a/grub-core/fs/sfs.c
+++ b/grub-core/fs/sfs.c
@@ -266,7 +266,7 @@ grub_sfs_read_block (grub_fshelp_node_t node, grub_disk_addr_t fileblock)
       node->next_extent = node->block;
       node->cache_size = 0;
 
-      node->cache = grub_malloc (sizeof (node->cache[0]) * cache_size);
+      node->cache = grub_calloc (cache_size, sizeof (node->cache[0]));
       if (!node->cache)
 	{
 	  grub_errno = 0;
diff --git a/grub-core/fs/tar.c b/grub-core/fs/tar.c
index 7d63e0c99..c551ed6b5 100644
--- a/grub-core/fs/tar.c
+++ b/grub-core/fs/tar.c
@@ -120,7 +120,7 @@ grub_cpio_find_file (struct grub_archelp_data *data, char **name,
 	  if (data->linkname_alloc < linksize + 1)
 	    {
 	      char *n;
-	      n = grub_malloc (2 * (linksize + 1));
+	      n = grub_calloc (2, linksize + 1);
 	      if (!n)
 		return grub_errno;
 	      grub_free (data->linkname);
diff --git a/grub-core/fs/udf.c b/grub-core/fs/udf.c
index dc8b6e2d1..a83761674 100644
--- a/grub-core/fs/udf.c
+++ b/grub-core/fs/udf.c
@@ -873,7 +873,7 @@ read_string (const grub_uint8_t *raw, grub_size_t sz, char *outbuf)
     {
       unsigned i;
       utf16len = sz - 1;
-      utf16 = grub_malloc (utf16len * sizeof (utf16[0]));
+      utf16 = grub_calloc (utf16len, sizeof (utf16[0]));
       if (!utf16)
 	return NULL;
       for (i = 0; i < utf16len; i++)
@@ -883,7 +883,7 @@ read_string (const grub_uint8_t *raw, grub_size_t sz, char *outbuf)
     {
       unsigned i;
       utf16len = (sz - 1) / 2;
-      utf16 = grub_malloc (utf16len * sizeof (utf16[0]));
+      utf16 = grub_calloc (utf16len, sizeof (utf16[0]));
       if (!utf16)
 	return NULL;
       for (i = 0; i < utf16len; i++)
diff --git a/grub-core/fs/zfs/zfs.c b/grub-core/fs/zfs/zfs.c
index 2f72e42bf..381dde556 100644
--- a/grub-core/fs/zfs/zfs.c
+++ b/grub-core/fs/zfs/zfs.c
@@ -3325,7 +3325,7 @@ dnode_get_fullpath (const char *fullpath, struct subvolume *subvol,
 	}
       subvol->nkeys = 0;
       zap_iterate (&keychain_dn, 8, count_zap_keys, &ctx, data);
-      subvol->keyring = grub_zalloc (subvol->nkeys * sizeof (subvol->keyring[0]));
+      subvol->keyring = grub_calloc (subvol->nkeys, sizeof (subvol->keyring[0]));
       if (!subvol->keyring)
 	{
 	  grub_free (fsname);
@@ -4336,7 +4336,7 @@ grub_zfs_embed (grub_device_t device __attribute__ ((unused)),
   *nsectors = (VDEV_BOOT_SIZE >> GRUB_DISK_SECTOR_BITS);
   if (*nsectors > max_nsectors)
     *nsectors = max_nsectors;
-  *sectors = grub_malloc (*nsectors * sizeof (**sectors));
+  *sectors = grub_calloc (*nsectors, sizeof (**sectors));
   if (!*sectors)
     return grub_errno;
   for (i = 0; i < *nsectors; i++)
diff --git a/grub-core/gfxmenu/gui_string_util.c b/grub-core/gfxmenu/gui_string_util.c
index a9a415e31..ba1e1eab3 100644
--- a/grub-core/gfxmenu/gui_string_util.c
+++ b/grub-core/gfxmenu/gui_string_util.c
@@ -55,7 +55,7 @@ canonicalize_path (const char *path)
     if (*p == '/')
       components++;
 
-  char **path_array = grub_malloc (components * sizeof (*path_array));
+  char **path_array = grub_calloc (components, sizeof (*path_array));
   if (! path_array)
     return 0;
 
diff --git a/grub-core/gfxmenu/widget-box.c b/grub-core/gfxmenu/widget-box.c
index b60602889..470597ded 100644
--- a/grub-core/gfxmenu/widget-box.c
+++ b/grub-core/gfxmenu/widget-box.c
@@ -303,10 +303,10 @@ grub_gfxmenu_create_box (const char *pixmaps_prefix,
   box->content_height = 0;
   box->raw_pixmaps =
     (struct grub_video_bitmap **)
-    grub_malloc (BOX_NUM_PIXMAPS * sizeof (struct grub_video_bitmap *));
+    grub_calloc (BOX_NUM_PIXMAPS, sizeof (struct grub_video_bitmap *));
   box->scaled_pixmaps =
     (struct grub_video_bitmap **)
-    grub_malloc (BOX_NUM_PIXMAPS * sizeof (struct grub_video_bitmap *));
+    grub_calloc (BOX_NUM_PIXMAPS, sizeof (struct grub_video_bitmap *));
 
   /* Initialize all pixmap pointers to NULL so that proper destruction can
      be performed if an error is encountered partway through construction.  */
diff --git a/grub-core/io/gzio.c b/grub-core/io/gzio.c
index 6208a9763..43d98a7bd 100644
--- a/grub-core/io/gzio.c
+++ b/grub-core/io/gzio.c
@@ -554,7 +554,7 @@ huft_build (unsigned *b,	/* code lengths in bits (all assumed <= BMAX) */
 	      z = 1 << j;	/* table entries for j-bit table */
 
 	      /* allocate and link in new table */
-	      q = (struct huft *) grub_zalloc ((z + 1) * sizeof (struct huft));
+	      q = (struct huft *) grub_calloc (z + 1, sizeof (struct huft));
 	      if (! q)
 		{
 		  if (h)
diff --git a/grub-core/kern/efi/efi.c b/grub-core/kern/efi/efi.c
index 96204e39b..ad170c7ce 100644
--- a/grub-core/kern/efi/efi.c
+++ b/grub-core/kern/efi/efi.c
@@ -202,7 +202,7 @@ grub_efi_set_variable(const char *var, const grub_efi_guid_t *guid,
 
   len = grub_strlen (var);
   len16 = len * GRUB_MAX_UTF16_PER_UTF8;
-  var16 = grub_malloc ((len16 + 1) * sizeof (var16[0]));
+  var16 = grub_calloc (len16 + 1, sizeof (var16[0]));
   if (!var16)
     return grub_errno;
   len16 = grub_utf8_to_utf16 (var16, len16, (grub_uint8_t *) var, len, NULL);
@@ -237,7 +237,7 @@ grub_efi_get_variable (const char *var, const grub_efi_guid_t *guid,
 
   len = grub_strlen (var);
   len16 = len * GRUB_MAX_UTF16_PER_UTF8;
-  var16 = grub_malloc ((len16 + 1) * sizeof (var16[0]));
+  var16 = grub_calloc (len16 + 1, sizeof (var16[0]));
   if (!var16)
     return NULL;
   len16 = grub_utf8_to_utf16 (var16, len16, (grub_uint8_t *) var, len, NULL);
@@ -411,7 +411,7 @@ grub_efi_get_filename (grub_efi_device_path_t *dp0)
 	  while (len > 0 && fp->path_name[len - 1] == 0)
 	    len--;
 
-	  dup_name = grub_malloc (len * sizeof (*dup_name));
+	  dup_name = grub_calloc (len, sizeof (*dup_name));
 	  if (!dup_name)
 	    {
 	      grub_free (name);
diff --git a/grub-core/kern/emu/hostdisk.c b/grub-core/kern/emu/hostdisk.c
index 8ac523953..f90b6c9ce 100644
--- a/grub-core/kern/emu/hostdisk.c
+++ b/grub-core/kern/emu/hostdisk.c
@@ -627,7 +627,7 @@ static char *
 grub_util_path_concat_real (size_t n, int ext, va_list ap)
 {
   size_t totlen = 0;
-  char **l = xmalloc ((n + ext) * sizeof (l[0]));
+  char **l = xcalloc (n + ext, sizeof (l[0]));
   char *r, *p, *pi;
   size_t i;
   int first = 1;
diff --git a/grub-core/kern/fs.c b/grub-core/kern/fs.c
index 2b85f4950..f90be6566 100644
--- a/grub-core/kern/fs.c
+++ b/grub-core/kern/fs.c
@@ -151,7 +151,7 @@ grub_fs_blocklist_open (grub_file_t file, const char *name)
   while (p);
 
   /* Allocate a block list.  */
-  blocks = grub_zalloc (sizeof (struct grub_fs_block) * (num + 1));
+  blocks = grub_calloc (num + 1, sizeof (struct grub_fs_block));
   if (! blocks)
     return 0;
 
diff --git a/grub-core/kern/misc.c b/grub-core/kern/misc.c
index 18cad5803..83c068d61 100644
--- a/grub-core/kern/misc.c
+++ b/grub-core/kern/misc.c
@@ -691,7 +691,7 @@ parse_printf_args (const char *fmt0, struct printf_args *args,
     args->ptr = args->prealloc;
   else
     {
-      args->ptr = grub_malloc (args->count * sizeof (args->ptr[0]));
+      args->ptr = grub_calloc (args->count, sizeof (args->ptr[0]));
       if (!args->ptr)
 	{
 	  grub_errno = GRUB_ERR_NONE;
diff --git a/grub-core/kern/parser.c b/grub-core/kern/parser.c
index 78175aac2..619db3122 100644
--- a/grub-core/kern/parser.c
+++ b/grub-core/kern/parser.c
@@ -213,7 +213,7 @@ grub_parser_split_cmdline (const char *cmdline,
     return grub_errno;
   grub_memcpy (args, buffer, bp - buffer);
 
-  *argv = grub_malloc (sizeof (char *) * (*argc + 1));
+  *argv = grub_calloc (*argc + 1, sizeof (char *));
   if (!*argv)
     {
       grub_free (args);
diff --git a/grub-core/kern/uboot/uboot.c b/grub-core/kern/uboot/uboot.c
index be4816fe6..aac8f9ae1 100644
--- a/grub-core/kern/uboot/uboot.c
+++ b/grub-core/kern/uboot/uboot.c
@@ -133,7 +133,7 @@ grub_uboot_dev_enum (void)
     return num_devices;
 
   max_devices = 2;
-  enum_devices = grub_malloc (sizeof(struct device_info) * max_devices);
+  enum_devices = grub_calloc (max_devices, sizeof(struct device_info));
   if (!enum_devices)
     return 0;
 
diff --git a/grub-core/lib/libgcrypt/cipher/ac.c b/grub-core/lib/libgcrypt/cipher/ac.c
index f5e946a2d..63f6fcd11 100644
--- a/grub-core/lib/libgcrypt/cipher/ac.c
+++ b/grub-core/lib/libgcrypt/cipher/ac.c
@@ -185,7 +185,7 @@ ac_data_mpi_copy (gcry_ac_mpi_t *data_mpis, unsigned int data_mpis_n,
   gcry_mpi_t mpi;
   char *label;
 
-  data_mpis_new = gcry_malloc (sizeof (*data_mpis_new) * data_mpis_n);
+  data_mpis_new = gcry_calloc (data_mpis_n, sizeof (*data_mpis_new));
   if (! data_mpis_new)
     {
       err = gcry_error_from_errno (errno);
@@ -572,7 +572,7 @@ _gcry_ac_data_to_sexp (gcry_ac_data_t data, gcry_sexp_t *sexp,
     }
 
   /* Add MPI list.  */
-  arg_list = gcry_malloc (sizeof (*arg_list) * (data_n + 1));
+  arg_list = gcry_calloc (data_n + 1, sizeof (*arg_list));
   if (! arg_list)
     {
       err = gcry_error_from_errno (errno);
@@ -1283,7 +1283,7 @@ ac_data_construct (const char *identifier, int include_flags,
   /* We build a list of arguments to pass to
      gcry_sexp_build_array().  */
   data_length = _gcry_ac_data_length (data);
-  arg_list = gcry_malloc (sizeof (*arg_list) * (data_length * 2));
+  arg_list = gcry_calloc (data_length, sizeof (*arg_list) * 2);
   if (! arg_list)
     {
       err = gcry_error_from_errno (errno);
@@ -1593,7 +1593,7 @@ _gcry_ac_key_pair_generate (gcry_ac_handle_t handle, unsigned int nbits,
 	arg_list_n += 2;
 
   /* Allocate list.  */
-  arg_list = gcry_malloc (sizeof (*arg_list) * arg_list_n);
+  arg_list = gcry_calloc (arg_list_n, sizeof (*arg_list));
   if (! arg_list)
     {
       err = gcry_error_from_errno (errno);
diff --git a/grub-core/lib/libgcrypt/cipher/primegen.c b/grub-core/lib/libgcrypt/cipher/primegen.c
index 2788e349f..b12e79b19 100644
--- a/grub-core/lib/libgcrypt/cipher/primegen.c
+++ b/grub-core/lib/libgcrypt/cipher/primegen.c
@@ -383,7 +383,7 @@ prime_generate_internal (int need_q_factor,
     }
 
   /* Allocate an array to track pool usage. */
-  pool_in_use = gcry_malloc (n * sizeof *pool_in_use);
+  pool_in_use = gcry_calloc (n, sizeof *pool_in_use);
   if (!pool_in_use)
     {
       err = gpg_err_code_from_errno (errno);
@@ -765,7 +765,7 @@ gen_prime (unsigned int nbits, int secret, int randomlevel,
   if (nbits < 16)
     log_fatal ("can't generate a prime with less than %d bits\n", 16);
 
-  mods = gcry_xmalloc( no_of_small_prime_numbers * sizeof *mods );
+  mods = gcry_xcalloc( no_of_small_prime_numbers, sizeof *mods);
   /* Make nbits fit into gcry_mpi_t implementation. */
   val_2  = mpi_alloc_set_ui( 2 );
   val_3 = mpi_alloc_set_ui( 3);
diff --git a/grub-core/lib/libgcrypt/cipher/pubkey.c b/grub-core/lib/libgcrypt/cipher/pubkey.c
index 910982141..ca087ad75 100644
--- a/grub-core/lib/libgcrypt/cipher/pubkey.c
+++ b/grub-core/lib/libgcrypt/cipher/pubkey.c
@@ -2941,7 +2941,7 @@ gcry_pk_encrypt (gcry_sexp_t *r_ciph, gcry_sexp_t s_data, gcry_sexp_t s_pkey)
        * array to a format string, so we have to do it this way :-(.  */
       /* FIXME: There is now such a format specifier, so we can
          change the code to be more clear. */
-      arg_list = malloc (nelem * sizeof *arg_list);
+      arg_list = calloc (nelem, sizeof *arg_list);
       if (!arg_list)
         {
           rc = gpg_err_code_from_syserror ();
@@ -3233,7 +3233,7 @@ gcry_pk_sign (gcry_sexp_t *r_sig, gcry_sexp_t s_hash, gcry_sexp_t s_skey)
         }
       strcpy (p, "))");
 
-      arg_list = malloc (nelem * sizeof *arg_list);
+      arg_list = calloc (nelem, sizeof *arg_list);
       if (!arg_list)
         {
           rc = gpg_err_code_from_syserror ();
diff --git a/grub-core/lib/priority_queue.c b/grub-core/lib/priority_queue.c
index 659be0b7f..7d5e7c05a 100644
--- a/grub-core/lib/priority_queue.c
+++ b/grub-core/lib/priority_queue.c
@@ -92,7 +92,7 @@ grub_priority_queue_new (grub_size_t elsize,
 {
   struct grub_priority_queue *ret;
   void *els;
-  els = grub_malloc (elsize * 8);
+  els = grub_calloc (8, elsize);
   if (!els)
     return 0;
   ret = (struct grub_priority_queue *) grub_malloc (sizeof (*ret));
diff --git a/grub-core/lib/reed_solomon.c b/grub-core/lib/reed_solomon.c
index ee9fa7b4f..467305b46 100644
--- a/grub-core/lib/reed_solomon.c
+++ b/grub-core/lib/reed_solomon.c
@@ -20,6 +20,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
+#define xcalloc calloc
 #define xmalloc malloc
 #define grub_memset memset
 #define grub_memcpy memcpy
@@ -158,11 +159,9 @@ rs_encode (gf_single_t *data, grub_size_t s, grub_size_t rs)
   gf_single_t *rs_polynomial;
   int i, j;
   gf_single_t *m;
-  m = xmalloc ((s + rs) * sizeof (gf_single_t));
+  m = xcalloc (s + rs, sizeof (gf_single_t));
   grub_memcpy (m, data, s * sizeof (gf_single_t));
-  grub_memset (m + s, 0, rs * sizeof (gf_single_t));
-  rs_polynomial = xmalloc ((rs + 1) * sizeof (gf_single_t));
-  grub_memset (rs_polynomial, 0, (rs + 1) * sizeof (gf_single_t));
+  rs_polynomial = xcalloc (rs + 1, sizeof (gf_single_t));
   rs_polynomial[rs] = 1;
   /* Multiply with X - a^r */
   for (j = 0; j < rs; j++)
diff --git a/grub-core/lib/relocator.c b/grub-core/lib/relocator.c
index ea3ebc719..5847aac36 100644
--- a/grub-core/lib/relocator.c
+++ b/grub-core/lib/relocator.c
@@ -495,9 +495,9 @@ malloc_in_range (struct grub_relocator *rel,
   }
 #endif
 
-  eventt = grub_malloc (maxevents * sizeof (events[0]));
+  eventt = grub_calloc (maxevents, sizeof (events[0]));
   counter = grub_malloc ((DIGITSORT_MASK + 2) * sizeof (counter[0]));
-  events = grub_malloc (maxevents * sizeof (events[0]));
+  events = grub_calloc (maxevents, sizeof (events[0]));
   if (!events || !eventt || !counter)
     {
       grub_dprintf ("relocator", "events or counter allocation failed %d\n",
@@ -963,7 +963,7 @@ malloc_in_range (struct grub_relocator *rel,
 #endif
     unsigned cural = 0;
     int oom = 0;
-    res->subchunks = grub_malloc (sizeof (res->subchunks[0]) * nallocs);
+    res->subchunks = grub_calloc (nallocs, sizeof (res->subchunks[0]));
     if (!res->subchunks)
       oom = 1;
     res->nsubchunks = nallocs;
@@ -1562,8 +1562,8 @@ grub_relocator_prepare_relocs (struct grub_relocator *rel, grub_addr_t addr,
 	    count[(chunk->src & 0xff) + 1]++;
 	  }
     }
-    from = grub_malloc (nchunks * sizeof (sorted[0]));
-    to = grub_malloc (nchunks * sizeof (sorted[0]));
+    from = grub_calloc (nchunks, sizeof (sorted[0]));
+    to = grub_calloc (nchunks, sizeof (sorted[0]));
     if (!from || !to)
       {
 	grub_free (from);
diff --git a/grub-core/lib/zstd/fse_decompress.c b/grub-core/lib/zstd/fse_decompress.c
index 72bbead5b..2227b84bc 100644
--- a/grub-core/lib/zstd/fse_decompress.c
+++ b/grub-core/lib/zstd/fse_decompress.c
@@ -82,7 +82,7 @@
 FSE_DTable* FSE_createDTable (unsigned tableLog)
 {
     if (tableLog > FSE_TABLELOG_ABSOLUTE_MAX) tableLog = FSE_TABLELOG_ABSOLUTE_MAX;
-    return (FSE_DTable*)malloc( FSE_DTABLE_SIZE_U32(tableLog) * sizeof (U32) );
+    return (FSE_DTable*)calloc( FSE_DTABLE_SIZE_U32(tableLog), sizeof (U32) );
 }
 
 void FSE_freeDTable (FSE_DTable* dt)
diff --git a/grub-core/loader/arm/linux.c b/grub-core/loader/arm/linux.c
index 092e8e307..979d425df 100644
--- a/grub-core/loader/arm/linux.c
+++ b/grub-core/loader/arm/linux.c
@@ -82,7 +82,7 @@ linux_prepare_atag (void *target_atag)
 
   /* some place for cmdline, initrd and terminator.  */
   tmp_size = get_atag_size (atag_orig) + 20 + (arg_size) / 4;
-  tmp_atag = grub_malloc (tmp_size * sizeof (grub_uint32_t));
+  tmp_atag = grub_calloc (tmp_size, sizeof (grub_uint32_t));
   if (!tmp_atag)
     return grub_errno;
 
diff --git a/grub-core/loader/efi/chainloader.c b/grub-core/loader/efi/chainloader.c
index cd92ea3f2..daf8c6b54 100644
--- a/grub-core/loader/efi/chainloader.c
+++ b/grub-core/loader/efi/chainloader.c
@@ -116,7 +116,7 @@ copy_file_path (grub_efi_file_path_device_path_t *fp,
   fp->header.type = GRUB_EFI_MEDIA_DEVICE_PATH_TYPE;
   fp->header.subtype = GRUB_EFI_FILE_PATH_DEVICE_PATH_SUBTYPE;
 
-  path_name = grub_malloc (len * GRUB_MAX_UTF16_PER_UTF8 * sizeof (*path_name));
+  path_name = grub_calloc (len, GRUB_MAX_UTF16_PER_UTF8 * sizeof (*path_name));
   if (!path_name)
     return;
 
diff --git a/grub-core/loader/i386/bsdXX.c b/grub-core/loader/i386/bsdXX.c
index af6741d15..a8d8bf7da 100644
--- a/grub-core/loader/i386/bsdXX.c
+++ b/grub-core/loader/i386/bsdXX.c
@@ -48,7 +48,7 @@ read_headers (grub_file_t file, const char *filename, Elf_Ehdr *e, char **shdr)
   if (e->e_ident[EI_CLASS] != SUFFIX (ELFCLASS))
     return grub_error (GRUB_ERR_BAD_OS, N_("invalid arch-dependent ELF magic"));
 
-  *shdr = grub_malloc ((grub_uint32_t) e->e_shnum * e->e_shentsize);
+  *shdr = grub_calloc (e->e_shnum, e->e_shentsize);
   if (! *shdr)
     return grub_errno;
 
diff --git a/grub-core/loader/i386/xnu.c b/grub-core/loader/i386/xnu.c
index e64ed08f5..b7d176b5d 100644
--- a/grub-core/loader/i386/xnu.c
+++ b/grub-core/loader/i386/xnu.c
@@ -295,7 +295,7 @@ grub_xnu_devprop_add_property_utf8 (struct grub_xnu_devprop_device_descriptor *d
     return grub_errno;
 
   len = grub_strlen (name);
-  utf16 = grub_malloc (sizeof (grub_uint16_t) * len);
+  utf16 = grub_calloc (len, sizeof (grub_uint16_t));
   if (!utf16)
     {
       grub_free (utf8);
@@ -331,7 +331,7 @@ grub_xnu_devprop_add_property_utf16 (struct grub_xnu_devprop_device_descriptor *
   grub_uint16_t *utf16;
   grub_err_t err;
 
-  utf16 = grub_malloc (sizeof (grub_uint16_t) * namelen);
+  utf16 = grub_calloc (namelen, sizeof (grub_uint16_t));
   if (!utf16)
     return grub_errno;
   grub_memcpy (utf16, name, sizeof (grub_uint16_t) * namelen);
diff --git a/grub-core/loader/macho.c b/grub-core/loader/macho.c
index 085f9c689..05710c48e 100644
--- a/grub-core/loader/macho.c
+++ b/grub-core/loader/macho.c
@@ -97,7 +97,7 @@ grub_macho_file (grub_file_t file, const char *filename, int is_64bit)
       if (grub_file_seek (macho->file, sizeof (struct grub_macho_fat_header))
 	  == (grub_off_t) -1)
 	goto fail;
-      archs = grub_malloc (sizeof (struct grub_macho_fat_arch) * narchs);
+      archs = grub_calloc (narchs, sizeof (struct grub_macho_fat_arch));
       if (!archs)
 	goto fail;
       if (grub_file_read (macho->file, archs,
diff --git a/grub-core/loader/multiboot_elfxx.c b/grub-core/loader/multiboot_elfxx.c
index 70cd1db51..cc6853692 100644
--- a/grub-core/loader/multiboot_elfxx.c
+++ b/grub-core/loader/multiboot_elfxx.c
@@ -217,7 +217,7 @@ CONCAT(grub_multiboot_load_elf, XX) (mbi_load_data_t *mld)
     {
       grub_uint8_t *shdr, *shdrptr;
 
-      shdr = grub_malloc ((grub_uint32_t) ehdr->e_shnum * ehdr->e_shentsize);
+      shdr = grub_calloc (ehdr->e_shnum, ehdr->e_shentsize);
       if (!shdr)
 	return grub_errno;
       
diff --git a/grub-core/loader/xnu.c b/grub-core/loader/xnu.c
index 7f74d1d6f..77d7060e1 100644
--- a/grub-core/loader/xnu.c
+++ b/grub-core/loader/xnu.c
@@ -800,7 +800,7 @@ grub_cmd_xnu_mkext (grub_command_t cmd __attribute__ ((unused)),
   if (grub_be_to_cpu32 (head.magic) == GRUB_MACHO_FAT_MAGIC)
     {
       narchs = grub_be_to_cpu32 (head.nfat_arch);
-      archs = grub_malloc (sizeof (struct grub_macho_fat_arch) * narchs);
+      archs = grub_calloc (narchs, sizeof (struct grub_macho_fat_arch));
       if (! archs)
 	{
 	  grub_file_close (file);
diff --git a/grub-core/mmap/mmap.c b/grub-core/mmap/mmap.c
index 6a31cbae3..57b4e9a72 100644
--- a/grub-core/mmap/mmap.c
+++ b/grub-core/mmap/mmap.c
@@ -143,9 +143,9 @@ grub_mmap_iterate (grub_memory_hook_t hook, void *hook_data)
 
   /* Initialize variables. */
   ctx.scanline_events = (struct grub_mmap_scan *)
-    grub_malloc (sizeof (struct grub_mmap_scan) * 2 * mmap_num);
+    grub_calloc (mmap_num, sizeof (struct grub_mmap_scan) * 2);
 
-  present = grub_zalloc (sizeof (present[0]) * current_priority);
+  present = grub_calloc (current_priority, sizeof (present[0]));
 
   if (! ctx.scanline_events || !present)
     {
diff --git a/grub-core/net/bootp.c b/grub-core/net/bootp.c
index 558d97ba1..dd0ffcdae 100644
--- a/grub-core/net/bootp.c
+++ b/grub-core/net/bootp.c
@@ -1559,7 +1559,7 @@ grub_cmd_bootp (struct grub_command *cmd __attribute__ ((unused)),
   if (ncards == 0)
     return grub_error (GRUB_ERR_NET_NO_CARD, N_("no network card found"));
 
-  ifaces = grub_zalloc (ncards * sizeof (ifaces[0]));
+  ifaces = grub_calloc (ncards, sizeof (ifaces[0]));
   if (!ifaces)
     return grub_errno;
 
diff --git a/grub-core/net/dns.c b/grub-core/net/dns.c
index 5d9afe093..e332d5eb4 100644
--- a/grub-core/net/dns.c
+++ b/grub-core/net/dns.c
@@ -285,8 +285,8 @@ recv_hook (grub_net_udp_socket_t sock __attribute__ ((unused)),
       ptr++;
       ptr += 4;
     }
-  *data->addresses = grub_malloc (sizeof ((*data->addresses)[0])
-				 * grub_be_to_cpu16 (head->ancount));
+  *data->addresses = grub_calloc (grub_be_to_cpu16 (head->ancount),
+				  sizeof ((*data->addresses)[0]));
   if (!*data->addresses)
     {
       grub_errno = GRUB_ERR_NONE;
@@ -406,8 +406,8 @@ recv_hook (grub_net_udp_socket_t sock __attribute__ ((unused)),
       dns_cache[h].addresses = 0;
       dns_cache[h].name = grub_strdup (data->oname);
       dns_cache[h].naddresses = *data->naddresses;
-      dns_cache[h].addresses = grub_malloc (*data->naddresses
-					    * sizeof (dns_cache[h].addresses[0]));
+      dns_cache[h].addresses = grub_calloc (*data->naddresses,
+					    sizeof (dns_cache[h].addresses[0]));
       dns_cache[h].limit_time = grub_get_time_ms () + 1000 * ttl_all;
       if (!dns_cache[h].addresses || !dns_cache[h].name)
 	{
@@ -479,7 +479,7 @@ grub_net_dns_lookup (const char *name,
 	}
     }
 
-  sockets = grub_malloc (sizeof (sockets[0]) * n_servers);
+  sockets = grub_calloc (n_servers, sizeof (sockets[0]));
   if (!sockets)
     return grub_errno;
 
diff --git a/grub-core/net/net.c b/grub-core/net/net.c
index b917a75d5..fed7bc57c 100644
--- a/grub-core/net/net.c
+++ b/grub-core/net/net.c
@@ -333,8 +333,8 @@ grub_cmd_ipv6_autoconf (struct grub_command *cmd __attribute__ ((unused)),
     ncards++;
   }
 
-  ifaces = grub_zalloc (ncards * sizeof (ifaces[0]));
-  slaacs = grub_zalloc (ncards * sizeof (slaacs[0]));
+  ifaces = grub_calloc (ncards, sizeof (ifaces[0]));
+  slaacs = grub_calloc (ncards, sizeof (slaacs[0]));
   if (!ifaces || !slaacs)
     {
       grub_free (ifaces);
diff --git a/grub-core/normal/charset.c b/grub-core/normal/charset.c
index b0ab47d73..d57fb72fa 100644
--- a/grub-core/normal/charset.c
+++ b/grub-core/normal/charset.c
@@ -203,7 +203,7 @@ grub_utf8_to_ucs4_alloc (const char *msg, grub_uint32_t **unicode_msg,
 {
   grub_size_t msg_len = grub_strlen (msg);
 
-  *unicode_msg = grub_malloc (msg_len * sizeof (grub_uint32_t));
+  *unicode_msg = grub_calloc (msg_len, sizeof (grub_uint32_t));
  
   if (!*unicode_msg)
     return -1;
@@ -488,7 +488,7 @@ grub_unicode_aglomerate_comb (const grub_uint32_t *in, grub_size_t inlen,
 	    }
 	  else
 	    {
-	      n = grub_malloc (sizeof (n[0]) * (out->ncomb + 1));
+	      n = grub_calloc (out->ncomb + 1, sizeof (n[0]));
 	      if (!n)
 		{
 		  grub_errno = GRUB_ERR_NONE;
@@ -842,7 +842,7 @@ grub_bidi_line_logical_to_visual (const grub_uint32_t *logical,
       }							\
   }
 
-  visual = grub_malloc (sizeof (visual[0]) * logical_len);
+  visual = grub_calloc (logical_len, sizeof (visual[0]));
   if (!visual)
     return -1;
 
@@ -1165,8 +1165,8 @@ grub_bidi_logical_to_visual (const grub_uint32_t *logical,
 {
   const grub_uint32_t *line_start = logical, *ptr;
   struct grub_unicode_glyph *visual_ptr;
-  *visual_out = visual_ptr = grub_malloc (3 * sizeof (visual_ptr[0])
-					  * (logical_len + 2));
+  *visual_out = visual_ptr = grub_calloc (logical_len + 2,
+					  3 * sizeof (visual_ptr[0]));
   if (!visual_ptr)
     return -1;
   for (ptr = logical; ptr <= logical + logical_len; ptr++)
diff --git a/grub-core/normal/cmdline.c b/grub-core/normal/cmdline.c
index c037d5050..c57242e2e 100644
--- a/grub-core/normal/cmdline.c
+++ b/grub-core/normal/cmdline.c
@@ -41,7 +41,7 @@ grub_err_t
 grub_set_history (int newsize)
 {
   grub_uint32_t **old_hist_lines = hist_lines;
-  hist_lines = grub_malloc (sizeof (grub_uint32_t *) * newsize);
+  hist_lines = grub_calloc (newsize, sizeof (grub_uint32_t *));
 
   /* Copy the old lines into the new buffer.  */
   if (old_hist_lines)
@@ -114,7 +114,7 @@ static void
 grub_history_set (int pos, grub_uint32_t *s, grub_size_t len)
 {
   grub_free (hist_lines[pos]);
-  hist_lines[pos] = grub_malloc ((len + 1) * sizeof (grub_uint32_t));
+  hist_lines[pos] = grub_calloc (len + 1, sizeof (grub_uint32_t));
   if (!hist_lines[pos])
     {
       grub_print_error ();
@@ -349,7 +349,7 @@ grub_cmdline_get (const char *prompt_translated)
   char *ret;
   unsigned nterms;
 
-  buf = grub_malloc (max_len * sizeof (grub_uint32_t));
+  buf = grub_calloc (max_len, sizeof (grub_uint32_t));
   if (!buf)
     return 0;
 
@@ -377,7 +377,7 @@ grub_cmdline_get (const char *prompt_translated)
     FOR_ACTIVE_TERM_OUTPUTS(cur)
       nterms++;
 
-    cl_terms = grub_malloc (sizeof (cl_terms[0]) * nterms);
+    cl_terms = grub_calloc (nterms, sizeof (cl_terms[0]));
     if (!cl_terms)
       {
 	grub_free (buf);
@@ -385,7 +385,7 @@ grub_cmdline_get (const char *prompt_translated)
       }
     cl_term_cur = cl_terms;
 
-    unicode_msg = grub_malloc (msg_len * sizeof (grub_uint32_t));
+    unicode_msg = grub_calloc (msg_len, sizeof (grub_uint32_t));
     if (!unicode_msg)
       {
 	grub_free (buf);
@@ -495,7 +495,7 @@ grub_cmdline_get (const char *prompt_translated)
 		grub_uint32_t *insert;
 
 		insertlen = grub_strlen (insertu8);
-		insert = grub_malloc ((insertlen + 1) * sizeof (grub_uint32_t));
+		insert = grub_calloc (insertlen + 1, sizeof (grub_uint32_t));
 		if (!insert)
 		  {
 		    grub_free (insertu8);
@@ -602,7 +602,7 @@ grub_cmdline_get (const char *prompt_translated)
 
 	      grub_free (kill_buf);
 
-	      kill_buf = grub_malloc ((n + 1) * sizeof(grub_uint32_t));
+	      kill_buf = grub_calloc (n + 1, sizeof (grub_uint32_t));
 	      if (grub_errno)
 		{
 		  grub_print_error ();
diff --git a/grub-core/normal/menu_entry.c b/grub-core/normal/menu_entry.c
index cdf3590a3..1993995be 100644
--- a/grub-core/normal/menu_entry.c
+++ b/grub-core/normal/menu_entry.c
@@ -95,8 +95,8 @@ init_line (struct screen *screen, struct line *linep)
 {
   linep->len = 0;
   linep->max_len = 80;
-  linep->buf = grub_malloc ((linep->max_len + 1) * sizeof (linep->buf[0]));
-  linep->pos = grub_zalloc (screen->nterms * sizeof (linep->pos[0]));
+  linep->buf = grub_calloc (linep->max_len + 1, sizeof (linep->buf[0]));
+  linep->pos = grub_calloc (screen->nterms, sizeof (linep->pos[0]));
   if (! linep->buf || !linep->pos)
     {
       grub_free (linep->buf);
@@ -287,7 +287,7 @@ update_screen (struct screen *screen, struct per_term_screen *term_screen,
 	  pos = linep->pos + (term_screen - screen->terms);
 
 	  if (!*pos)
-	    *pos = grub_zalloc ((linep->len + 1) * sizeof (**pos));
+	    *pos = grub_calloc (linep->len + 1, sizeof (**pos));
 
 	  if (i == region_start || linep == screen->lines + screen->line
 	      || (i > region_start && mode == ALL_LINES))
@@ -471,7 +471,7 @@ insert_string (struct screen *screen, const char *s, int update)
 
 	  /* Insert the string.  */
 	  current_linep = screen->lines + screen->line;
-	  unicode_msg = grub_malloc ((p - s) * sizeof (grub_uint32_t));
+	  unicode_msg = grub_calloc (p - s, sizeof (grub_uint32_t));
 
 	  if (!unicode_msg)
 	    return 0;
@@ -1023,7 +1023,7 @@ complete (struct screen *screen, int continuous, int update)
   if (completion_buffer.buf)
     {
       buflen = grub_strlen (completion_buffer.buf);
-      ucs4 = grub_malloc (sizeof (grub_uint32_t) * (buflen + 1));
+      ucs4 = grub_calloc (buflen + 1, sizeof (grub_uint32_t));
       
       if (!ucs4)
 	{
@@ -1268,7 +1268,7 @@ grub_menu_entry_run (grub_menu_entry_t entry)
   for (i = 0; i < (unsigned) screen->num_lines; i++)
     {
       grub_free (screen->lines[i].pos);
-      screen->lines[i].pos = grub_zalloc (screen->nterms * sizeof (screen->lines[i].pos[0]));
+      screen->lines[i].pos = grub_calloc (screen->nterms, sizeof (screen->lines[i].pos[0]));
       if (! screen->lines[i].pos)
 	{
 	  grub_print_error ();
@@ -1278,7 +1278,7 @@ grub_menu_entry_run (grub_menu_entry_t entry)
 	}
     }
 
-  screen->terms = grub_zalloc (screen->nterms * sizeof (screen->terms[0]));
+  screen->terms = grub_calloc (screen->nterms, sizeof (screen->terms[0]));
   if (!screen->terms)
     {
       grub_print_error ();
diff --git a/grub-core/normal/menu_text.c b/grub-core/normal/menu_text.c
index e22bb91f6..18240e76c 100644
--- a/grub-core/normal/menu_text.c
+++ b/grub-core/normal/menu_text.c
@@ -78,7 +78,7 @@ grub_print_message_indented_real (const char *msg, int margin_left,
   grub_size_t msg_len = grub_strlen (msg) + 2;
   int ret = 0;
 
-  unicode_msg = grub_malloc (msg_len * sizeof (grub_uint32_t));
+  unicode_msg = grub_calloc (msg_len, sizeof (grub_uint32_t));
  
   if (!unicode_msg)
     return 0;
@@ -211,7 +211,7 @@ print_entry (int y, int highlight, grub_menu_entry_t entry,
 
   title = entry ? entry->title : "";
   title_len = grub_strlen (title);
-  unicode_title = grub_malloc (title_len * sizeof (*unicode_title));
+  unicode_title = grub_calloc (title_len, sizeof (*unicode_title));
   if (! unicode_title)
     /* XXX How to show this error?  */
     return;
diff --git a/grub-core/normal/term.c b/grub-core/normal/term.c
index a1e5c5a0d..cc8c173b6 100644
--- a/grub-core/normal/term.c
+++ b/grub-core/normal/term.c
@@ -264,7 +264,7 @@ grub_term_save_pos (void)
   FOR_ACTIVE_TERM_OUTPUTS(cur)
     cnt++;
 
-  ret = grub_malloc (cnt * sizeof (ret[0]));
+  ret = grub_calloc (cnt, sizeof (ret[0]));
   if (!ret)
     return NULL;
 
@@ -1013,7 +1013,7 @@ grub_xnputs (const char *str, grub_size_t msg_len)
 
   grub_error_push ();
 
-  unicode_str = grub_malloc (msg_len * sizeof (grub_uint32_t));
+  unicode_str = grub_calloc (msg_len, sizeof (grub_uint32_t));
  
   grub_error_pop ();
 
diff --git a/grub-core/osdep/linux/getroot.c b/grub-core/osdep/linux/getroot.c
index 7adc0f30e..a5bd0752f 100644
--- a/grub-core/osdep/linux/getroot.c
+++ b/grub-core/osdep/linux/getroot.c
@@ -168,7 +168,7 @@ grub_util_raid_getmembers (const char *name, int bootable)
   if (ret != 0)
     grub_util_error (_("ioctl GET_ARRAY_INFO error: %s"), strerror (errno));
 
-  devicelist = xmalloc ((info.nr_disks + 1) * sizeof (char *));
+  devicelist = xcalloc (info.nr_disks + 1, sizeof (char *));
 
   for (i = 0, j = 0; j < info.nr_disks; i++)
     {
@@ -241,7 +241,7 @@ grub_find_root_devices_from_btrfs (const char *dir)
       return NULL;
     }
 
-  ret = xmalloc ((fsi.num_devices + 1) * sizeof (ret[0]));
+  ret = xcalloc (fsi.num_devices + 1, sizeof (ret[0]));
 
   for (i = 1; i <= fsi.max_id && j < fsi.num_devices; i++)
     {
@@ -396,7 +396,7 @@ grub_find_root_devices_from_mountinfo (const char *dir, char **relroot)
   if (relroot)
     *relroot = NULL;
 
-  entries = xmalloc (entry_max * sizeof (*entries));
+  entries = xcalloc (entry_max, sizeof (*entries));
 
 again:
   fp = grub_util_fopen ("/proc/self/mountinfo", "r");
diff --git a/grub-core/osdep/windows/getroot.c b/grub-core/osdep/windows/getroot.c
index 661d95461..eada663b2 100644
--- a/grub-core/osdep/windows/getroot.c
+++ b/grub-core/osdep/windows/getroot.c
@@ -59,7 +59,7 @@ grub_get_mount_point (const TCHAR *path)
 
   for (ptr = path; *ptr; ptr++);
   allocsize = (ptr - path + 10) * 2;
-  out = xmalloc (allocsize * sizeof (out[0]));
+  out = xcalloc (allocsize, sizeof (out[0]));
 
   /* When pointing to EFI system partition GetVolumePathName fails
      for ESP root and returns abberant information for everything
diff --git a/grub-core/osdep/windows/hostdisk.c b/grub-core/osdep/windows/hostdisk.c
index 355100789..0be327394 100644
--- a/grub-core/osdep/windows/hostdisk.c
+++ b/grub-core/osdep/windows/hostdisk.c
@@ -111,7 +111,7 @@ grub_util_get_windows_path_real (const char *path)
 
   while (1)
     {
-      fpa = xmalloc (alloc * sizeof (fpa[0]));
+      fpa = xcalloc (alloc, sizeof (fpa[0]));
 
       len = GetFullPathName (tpath, alloc, fpa, NULL);
       if (len >= alloc)
@@ -399,7 +399,7 @@ grub_util_fd_opendir (const char *name)
   for (l = 0; name_windows[l]; l++);
   for (l--; l >= 0 && (name_windows[l] == '\\' || name_windows[l] == '/'); l--);
   l++;
-  pattern = xmalloc ((l + 3) * sizeof (pattern[0]));
+  pattern = xcalloc (l + 3, sizeof (pattern[0]));
   memcpy (pattern, name_windows, l * sizeof (pattern[0]));
   pattern[l] = '\\';
   pattern[l + 1] = '*';
diff --git a/grub-core/osdep/windows/init.c b/grub-core/osdep/windows/init.c
index e8ffd62c6..6297de632 100644
--- a/grub-core/osdep/windows/init.c
+++ b/grub-core/osdep/windows/init.c
@@ -161,7 +161,7 @@ grub_util_host_init (int *argc __attribute__ ((unused)),
   LPWSTR *targv;
 
   targv = CommandLineToArgvW (tcmdline, argc);
-  *argv = xmalloc ((*argc + 1) * sizeof (argv[0]));
+  *argv = xcalloc (*argc + 1, sizeof (argv[0]));
 
   for (i = 0; i < *argc; i++)
     (*argv)[i] = grub_util_tchar_to_utf8 (targv[i]); 
diff --git a/grub-core/osdep/windows/platform.c b/grub-core/osdep/windows/platform.c
index e19a3d9a8..cb626c8c3 100644
--- a/grub-core/osdep/windows/platform.c
+++ b/grub-core/osdep/windows/platform.c
@@ -231,8 +231,8 @@ grub_install_register_efi (grub_device_t efidir_grub_dev,
     grub_util_error ("%s", _("no EFI routines are available when running in BIOS mode"));
 
   distrib8_len = grub_strlen (efi_distributor);
-  distributor16 = xmalloc ((distrib8_len + 1) * GRUB_MAX_UTF16_PER_UTF8
-			   * sizeof (grub_uint16_t));
+  distributor16 = xcalloc (distrib8_len + 1,
+			   GRUB_MAX_UTF16_PER_UTF8 * sizeof (grub_uint16_t));
   distrib16_len = grub_utf8_to_utf16 (distributor16, distrib8_len * GRUB_MAX_UTF16_PER_UTF8,
 				      (const grub_uint8_t *) efi_distributor,
 				      distrib8_len, 0);
diff --git a/grub-core/osdep/windows/relpath.c b/grub-core/osdep/windows/relpath.c
index cb0861744..478e8ef14 100644
--- a/grub-core/osdep/windows/relpath.c
+++ b/grub-core/osdep/windows/relpath.c
@@ -72,7 +72,7 @@ grub_make_system_path_relative_to_its_root (const char *path)
       if (dirwindows[0] && dirwindows[1] == ':')
 	offset = 2;
     }
-  ret = xmalloc (sizeof (ret[0]) * (flen - offset + 2));
+  ret = xcalloc (flen - offset + 2, sizeof (ret[0]));
   if (dirwindows[offset] != '\\'
       && dirwindows[offset] != '/'
       && dirwindows[offset])
diff --git a/grub-core/partmap/gpt.c b/grub-core/partmap/gpt.c
index 103f6796f..72a2e37cd 100644
--- a/grub-core/partmap/gpt.c
+++ b/grub-core/partmap/gpt.c
@@ -199,7 +199,7 @@ gpt_partition_map_embed (struct grub_disk *disk, unsigned int *nsectors,
   *nsectors = ctx.len;
   if (*nsectors > max_nsectors)
     *nsectors = max_nsectors;
-  *sectors = grub_malloc (*nsectors * sizeof (**sectors));
+  *sectors = grub_calloc (*nsectors, sizeof (**sectors));
   if (!*sectors)
     return grub_errno;
   for (i = 0; i < *nsectors; i++)
diff --git a/grub-core/partmap/msdos.c b/grub-core/partmap/msdos.c
index 7b8e45076..ee3f24982 100644
--- a/grub-core/partmap/msdos.c
+++ b/grub-core/partmap/msdos.c
@@ -337,7 +337,7 @@ pc_partition_map_embed (struct grub_disk *disk, unsigned int *nsectors,
       avail_nsectors = *nsectors;
       if (*nsectors > max_nsectors)
 	*nsectors = max_nsectors;
-      *sectors = grub_malloc (*nsectors * sizeof (**sectors));
+      *sectors = grub_calloc (*nsectors, sizeof (**sectors));
       if (!*sectors)
 	return grub_errno;
       for (i = 0; i < *nsectors; i++)
diff --git a/grub-core/script/execute.c b/grub-core/script/execute.c
index ee299fd0e..c8d6806fe 100644
--- a/grub-core/script/execute.c
+++ b/grub-core/script/execute.c
@@ -553,7 +553,7 @@ gettext_append (struct grub_script_argv *result, const char *orig_str)
   for (iptr = orig_str; *iptr; iptr++)
     if (*iptr == '$')
       dollar_cnt++;
-  ctx.allowed_strings = grub_malloc (sizeof (ctx.allowed_strings[0]) * dollar_cnt);
+  ctx.allowed_strings = grub_calloc (dollar_cnt, sizeof (ctx.allowed_strings[0]));
 
   if (parse_string (orig_str, gettext_save_allow, &ctx, 0))
     goto fail;
diff --git a/grub-core/tests/fake_input.c b/grub-core/tests/fake_input.c
index 2d6085298..b5eb516be 100644
--- a/grub-core/tests/fake_input.c
+++ b/grub-core/tests/fake_input.c
@@ -49,7 +49,7 @@ grub_terminal_input_fake_sequence (int *seq_in, int nseq_in)
     saved = grub_term_inputs;
   if (seq)
     grub_free (seq);
-  seq = grub_malloc (nseq_in * sizeof (seq[0]));
+  seq = grub_calloc (nseq_in, sizeof (seq[0]));
   if (!seq)
     return;
 
diff --git a/grub-core/tests/video_checksum.c b/grub-core/tests/video_checksum.c
index 74d5b65e5..44d081069 100644
--- a/grub-core/tests/video_checksum.c
+++ b/grub-core/tests/video_checksum.c
@@ -336,7 +336,7 @@ grub_video_capture_write_bmp (const char *fname,
     {
     case 4:
       {
-	grub_uint8_t *buffer = xmalloc (mode_info->width * 3);
+	grub_uint8_t *buffer = xcalloc (3, mode_info->width);
 	grub_uint32_t rmask = ((1 << mode_info->red_mask_size) - 1);
 	grub_uint32_t gmask = ((1 << mode_info->green_mask_size) - 1);
 	grub_uint32_t bmask = ((1 << mode_info->blue_mask_size) - 1);
@@ -367,7 +367,7 @@ grub_video_capture_write_bmp (const char *fname,
       }
     case 3:
       {
-	grub_uint8_t *buffer = xmalloc (mode_info->width * 3);
+	grub_uint8_t *buffer = xcalloc (3, mode_info->width);
 	grub_uint32_t rmask = ((1 << mode_info->red_mask_size) - 1);
 	grub_uint32_t gmask = ((1 << mode_info->green_mask_size) - 1);
 	grub_uint32_t bmask = ((1 << mode_info->blue_mask_size) - 1);
@@ -407,7 +407,7 @@ grub_video_capture_write_bmp (const char *fname,
       }
     case 2:
       {
-	grub_uint8_t *buffer = xmalloc (mode_info->width * 3);
+	grub_uint8_t *buffer = xcalloc (3, mode_info->width);
 	grub_uint16_t rmask = ((1 << mode_info->red_mask_size) - 1);
 	grub_uint16_t gmask = ((1 << mode_info->green_mask_size) - 1);
 	grub_uint16_t bmask = ((1 << mode_info->blue_mask_size) - 1);
diff --git a/grub-core/video/capture.c b/grub-core/video/capture.c
index 4f83c7441..4d3195e01 100644
--- a/grub-core/video/capture.c
+++ b/grub-core/video/capture.c
@@ -89,7 +89,7 @@ grub_video_capture_start (const struct grub_video_mode_info *mode_info,
   framebuffer.mode_info = *mode_info;
   framebuffer.mode_info.blit_format = grub_video_get_blit_format (&framebuffer.mode_info);
 
-  framebuffer.ptr = grub_malloc (framebuffer.mode_info.height * framebuffer.mode_info.pitch);
+  framebuffer.ptr = grub_calloc (framebuffer.mode_info.height, framebuffer.mode_info.pitch);
   if (!framebuffer.ptr)
     return grub_errno;
   
diff --git a/grub-core/video/emu/sdl.c b/grub-core/video/emu/sdl.c
index a2f639f66..0ebab6f57 100644
--- a/grub-core/video/emu/sdl.c
+++ b/grub-core/video/emu/sdl.c
@@ -172,7 +172,7 @@ grub_video_sdl_set_palette (unsigned int start, unsigned int count,
       if (start + count > mode_info.number_of_colors)
 	count = mode_info.number_of_colors - start;
 
-      tmp = grub_malloc (count * sizeof (tmp[0]));
+      tmp = grub_calloc (count, sizeof (tmp[0]));
       for (i = 0; i < count; i++)
 	{
 	  tmp[i].r = palette_data[i].r;
diff --git a/grub-core/video/i386/pc/vga.c b/grub-core/video/i386/pc/vga.c
index 01f47112d..b2f776c99 100644
--- a/grub-core/video/i386/pc/vga.c
+++ b/grub-core/video/i386/pc/vga.c
@@ -127,7 +127,7 @@ grub_video_vga_setup (unsigned int width, unsigned int height,
 
   vga_height = height ? : 480;
 
-  framebuffer.temporary_buffer = grub_malloc (vga_height * VGA_WIDTH);
+  framebuffer.temporary_buffer = grub_calloc (vga_height, VGA_WIDTH);
   framebuffer.front_page = 0;
   framebuffer.back_page = 0;
   if (!framebuffer.temporary_buffer)
diff --git a/grub-core/video/readers/png.c b/grub-core/video/readers/png.c
index 777e71334..61bd64537 100644
--- a/grub-core/video/readers/png.c
+++ b/grub-core/video/readers/png.c
@@ -309,7 +309,7 @@ grub_png_decode_image_header (struct grub_png_data *data)
   if (data->is_16bit || data->is_gray || data->is_palette)
 #endif
     {
-      data->image_data = grub_malloc (data->image_height * data->row_bytes);
+      data->image_data = grub_calloc (data->image_height, data->row_bytes);
       if (grub_errno)
         return grub_errno;
 
diff --git a/include/grub/unicode.h b/include/grub/unicode.h
index a0403e91f..4de986a85 100644
--- a/include/grub/unicode.h
+++ b/include/grub/unicode.h
@@ -293,7 +293,7 @@ grub_unicode_glyph_dup (const struct grub_unicode_glyph *in)
   grub_memcpy (out, in, sizeof (*in));
   if (in->ncomb > ARRAY_SIZE (out->combining_inline))
     {
-      out->combining_ptr = grub_malloc (in->ncomb * sizeof (out->combining_ptr[0]));
+      out->combining_ptr = grub_calloc (in->ncomb, sizeof (out->combining_ptr[0]));
       if (!out->combining_ptr)
 	{
 	  grub_free (out);
@@ -315,7 +315,7 @@ grub_unicode_set_glyph (struct grub_unicode_glyph *out,
   grub_memcpy (out, in, sizeof (*in));
   if (in->ncomb > ARRAY_SIZE (out->combining_inline))
     {
-      out->combining_ptr = grub_malloc (in->ncomb * sizeof (out->combining_ptr[0]));
+      out->combining_ptr = grub_calloc (in->ncomb, sizeof (out->combining_ptr[0]));
       if (!out->combining_ptr)
 	return;
       grub_memcpy (out->combining_ptr, in->combining_ptr,
diff --git a/util/getroot.c b/util/getroot.c
index cdd41153c..6ae35ecaa 100644
--- a/util/getroot.c
+++ b/util/getroot.c
@@ -200,7 +200,7 @@ make_device_name (const char *drive)
   char *ret, *ptr;
   const char *iptr;
 
-  ret = xmalloc (strlen (drive) * 2);
+  ret = xcalloc (2, strlen (drive));
   ptr = ret;
   for (iptr = drive; *iptr; iptr++)
     {
diff --git a/util/grub-file.c b/util/grub-file.c
index 50c18b683..b2e7dd69f 100644
--- a/util/grub-file.c
+++ b/util/grub-file.c
@@ -54,7 +54,7 @@ main (int argc, char *argv[])
 
   grub_util_host_init (&argc, &argv);
 
-  argv2 = xmalloc (argc * sizeof (argv2[0]));
+  argv2 = xcalloc (argc, sizeof (argv2[0]));
 
   if (argc == 2 && strcmp (argv[1], "--version") == 0)
     {
diff --git a/util/grub-fstest.c b/util/grub-fstest.c
index f14e02d97..57246af7c 100644
--- a/util/grub-fstest.c
+++ b/util/grub-fstest.c
@@ -650,7 +650,7 @@ argp_parser (int key, char *arg, struct argp_state *state)
   if (args_count < num_disks)
     {
       if (args_count == 0)
-	images = xmalloc (num_disks * sizeof (images[0]));
+	images = xcalloc (num_disks, sizeof (images[0]));
       images[args_count] = grub_canonicalize_file_name (arg);
       args_count++;
       return 0;
@@ -734,7 +734,7 @@ main (int argc, char *argv[])
 
   grub_util_host_init (&argc, &argv);
 
-  args = xmalloc (argc * sizeof (args[0]));
+  args = xcalloc (argc, sizeof (args[0]));
 
   argp_parse (&argp, argc, argv, 0, 0, 0);
 
diff --git a/util/grub-install-common.c b/util/grub-install-common.c
index fdfe2c7ea..447504d3f 100644
--- a/util/grub-install-common.c
+++ b/util/grub-install-common.c
@@ -286,7 +286,7 @@ handle_install_list (struct install_list *il, const char *val,
       il->n_entries++;
     }
   il->n_alloc = il->n_entries + 1;
-  il->entries = xmalloc (il->n_alloc * sizeof (il->entries[0]));
+  il->entries = xcalloc (il->n_alloc, sizeof (il->entries[0]));
   ptr = val;
   for (ce = il->entries; ; ce++)
     {
diff --git a/util/grub-install.c b/util/grub-install.c
index 666cef3d2..bd6d8dbb3 100644
--- a/util/grub-install.c
+++ b/util/grub-install.c
@@ -655,7 +655,7 @@ device_map_check_duplicates (const char *dev_map)
   if (! fp)
     return;
 
-  d = xmalloc (alloced * sizeof (d[0]));
+  d = xcalloc (alloced, sizeof (d[0]));
 
   while (fgets (buf, sizeof (buf), fp))
     {
@@ -1374,7 +1374,7 @@ main (int argc, char *argv[])
       ndev++;
     }
 
-  grub_drives = xmalloc (sizeof (grub_drives[0]) * (ndev + 1)); 
+  grub_drives = xcalloc (ndev + 1, sizeof (grub_drives[0]));
 
   for (curdev = grub_devices, curdrive = grub_drives; *curdev; curdev++,
        curdrive++)
diff --git a/util/grub-mkimagexx.c b/util/grub-mkimagexx.c
index bc087c2b5..d97d0e7be 100644
--- a/util/grub-mkimagexx.c
+++ b/util/grub-mkimagexx.c
@@ -2294,10 +2294,8 @@ SUFFIX (grub_mkimage_load_image) (const char *kernel_path,
 		      + grub_host_to_target16 (e->e_shstrndx) * smd.section_entsize);
   smd.strtab = (char *) e + grub_host_to_target_addr (s->sh_offset);
 
-  smd.addrs = xmalloc (sizeof (*smd.addrs) * smd.num_sections);
-  memset (smd.addrs, 0, sizeof (*smd.addrs) * smd.num_sections);
-  smd.vaddrs = xmalloc (sizeof (*smd.vaddrs) * smd.num_sections);
-  memset (smd.vaddrs, 0, sizeof (*smd.vaddrs) * smd.num_sections);
+  smd.addrs = xcalloc (smd.num_sections, sizeof (*smd.addrs));
+  smd.vaddrs = xcalloc (smd.num_sections, sizeof (*smd.vaddrs));
 
   SUFFIX (locate_sections) (e, kernel_path, &smd, layout, image_target);
 
diff --git a/util/grub-mkrescue.c b/util/grub-mkrescue.c
index 45d6140d3..cb972f120 100644
--- a/util/grub-mkrescue.c
+++ b/util/grub-mkrescue.c
@@ -441,8 +441,8 @@ main (int argc, char *argv[])
   xorriso = xstrdup ("xorriso");
   label_font = grub_util_path_concat (2, pkgdatadir, "unicode.pf2");
 
-  argp_argv = xmalloc (sizeof (argp_argv[0]) * argc);
-  xorriso_tail_argv = xmalloc (sizeof (argp_argv[0]) * argc);
+  argp_argv = xcalloc (argc, sizeof (argp_argv[0]));
+  xorriso_tail_argv = xcalloc (argc, sizeof (argp_argv[0]));
 
   xorriso_tail_argc = 0;
   /* Program name */
diff --git a/util/grub-mkstandalone.c b/util/grub-mkstandalone.c
index 4907d44c0..edf309717 100644
--- a/util/grub-mkstandalone.c
+++ b/util/grub-mkstandalone.c
@@ -296,7 +296,7 @@ main (int argc, char *argv[])
   grub_util_host_init (&argc, &argv);
   grub_util_disable_fd_syncs ();
 
-  files = xmalloc ((argc + 1) * sizeof (files[0]));
+  files = xcalloc (argc + 1, sizeof (files[0]));
 
   argp_parse (&argp, argc, argv, 0, 0, 0);
 
diff --git a/util/grub-pe2elf.c b/util/grub-pe2elf.c
index 0d4084a10..11331294f 100644
--- a/util/grub-pe2elf.c
+++ b/util/grub-pe2elf.c
@@ -100,9 +100,9 @@ write_section_data (FILE* fp, const char *name, char *image,
   char *pe_strtab = (image + pe_chdr->symtab_offset
 		     + pe_chdr->num_symbols * sizeof (struct grub_pe32_symbol));
 
-  section_map = xmalloc ((2 * pe_chdr->num_sections + 5) * sizeof (int));
+  section_map = xcalloc (2 * pe_chdr->num_sections + 5, sizeof (int));
   section_map[0] = 0;
-  shdr = xmalloc ((2 * pe_chdr->num_sections + 5) * sizeof (shdr[0]));
+  shdr = xcalloc (2 * pe_chdr->num_sections + 5, sizeof (shdr[0]));
   idx = 1;
   idx_reloc = pe_chdr->num_sections + 1;
 
@@ -233,7 +233,7 @@ write_reloc_section (FILE* fp, const char *name, char *image,
 
       pe_sec = pe_shdr + shdr[i].sh_link;
       pe_rel = (struct grub_pe32_reloc *) (image + pe_sec->relocations_offset);
-      rel = (elf_reloc_t *) xmalloc (pe_sec->num_relocations * sizeof (elf_reloc_t));
+      rel = (elf_reloc_t *) xcalloc (pe_sec->num_relocations, sizeof (elf_reloc_t));
       num_rels = 0;
       modified = 0;
 
@@ -365,12 +365,10 @@ write_symbol_table (FILE* fp, const char *name, char *image,
   pe_symtab = (struct grub_pe32_symbol *) (image + pe_chdr->symtab_offset);
   pe_strtab = (char *) (pe_symtab + pe_chdr->num_symbols);
 
-  symtab = (Elf_Sym *) xmalloc ((pe_chdr->num_symbols + 1) *
-				sizeof (Elf_Sym));
-  memset (symtab, 0, (pe_chdr->num_symbols + 1) * sizeof (Elf_Sym));
+  symtab = (Elf_Sym *) xcalloc (pe_chdr->num_symbols + 1, sizeof (Elf_Sym));
   num_syms = 1;
 
-  symtab_map = (int *) xmalloc (pe_chdr->num_symbols * sizeof (int));
+  symtab_map = (int *) xcalloc (pe_chdr->num_symbols, sizeof (int));
 
   for (i = 0; i < (int) pe_chdr->num_symbols;
        i += pe_symtab->num_aux + 1, pe_symtab += pe_symtab->num_aux + 1)
diff --git a/util/grub-probe.c b/util/grub-probe.c
index 81d27eead..cbe6ed94c 100644
--- a/util/grub-probe.c
+++ b/util/grub-probe.c
@@ -361,8 +361,8 @@ probe (const char *path, char **device_names, char delim)
       grub_util_pull_device (*curdev);
       ndev++;
     }
-  
-  drives_names = xmalloc (sizeof (drives_names[0]) * (ndev + 1)); 
+
+  drives_names = xcalloc (ndev + 1, sizeof (drives_names[0]));
 
   for (curdev = device_names, curdrive = drives_names; *curdev; curdev++,
        curdrive++)

From d84e89f4734711d8ff3c84b6c58985c824b4d889 Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Mon, 15 Jun 2020 12:28:27 -0400
Subject: malloc: Use overflow checking primitives where we do
 complex allocations

This attempts to fix the places where we do the following where
arithmetic_expr may include unvalidated data:

  X = grub_malloc(arithmetic_expr);

It accomplishes this by doing the arithmetic ahead of time using grub_add(),
grub_sub(), grub_mul() and testing for overflow before proceeding.

Among other issues, this fixes:
  - allocation of integer overflow in grub_video_bitmap_create()
    reported by Chris Coulson,
  - allocation of integer overflow in grub_png_decode_image_header()
    reported by Chris Coulson,
  - allocation of integer overflow in grub_squash_read_symlink()
    reported by Chris Coulson,
  - allocation of integer overflow in grub_ext2_read_symlink()
    reported by Chris Coulson,
  - allocation of integer overflow in read_section_as_string()
    reported by Chris Coulson.

Fixes: CVE-2020-14309, CVE-2020-14310, CVE-2020-14311

Signed-off-by: Peter Jones <pjones@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/commands/legacycfg.c | 29 +++++++++++++++----
 grub-core/commands/wildcard.c  | 36 ++++++++++++++++++++----
 grub-core/disk/ldm.c           | 32 +++++++++++++++------
 grub-core/font/font.c          |  7 ++++-
 grub-core/fs/btrfs.c           | 28 +++++++++++++------
 grub-core/fs/ext2.c            | 10 ++++++-
 grub-core/fs/iso9660.c         | 51 ++++++++++++++++++++++++----------
 grub-core/fs/sfs.c             | 27 ++++++++++++++----
 grub-core/fs/squash4.c         | 45 ++++++++++++++++++++++--------
 grub-core/fs/udf.c             | 41 +++++++++++++++++----------
 grub-core/fs/xfs.c             | 11 +++++---
 grub-core/fs/zfs/zfs.c         | 22 ++++++++++-----
 grub-core/fs/zfs/zfscrypt.c    |  7 ++++-
 grub-core/lib/arg.c            | 20 +++++++++++--
 grub-core/loader/i386/bsd.c    |  8 +++++-
 grub-core/net/dns.c            |  9 +++++-
 grub-core/normal/charset.c     | 10 +++++--
 grub-core/normal/cmdline.c     | 14 ++++++++--
 grub-core/normal/menu_entry.c  | 13 +++++++--
 grub-core/script/argv.c        | 16 +++++++++--
 grub-core/script/lexer.c       | 21 ++++++++++++--
 grub-core/video/bitmap.c       | 25 +++++++++++------
 grub-core/video/readers/png.c  | 13 +++++++--
 23 files changed, 382 insertions(+), 113 deletions(-)

diff --git a/grub-core/commands/legacycfg.c b/grub-core/commands/legacycfg.c
index 5e3ec0d5e..cc5971f4d 100644
--- a/grub-core/commands/legacycfg.c
+++ b/grub-core/commands/legacycfg.c
@@ -32,6 +32,7 @@
 #include <grub/auth.h>
 #include <grub/disk.h>
 #include <grub/partition.h>
+#include <grub/safemath.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
@@ -104,13 +105,22 @@ legacy_file (const char *filename)
 	if (newsuffix)
 	  {
 	    char *t;
-	    
+	    grub_size_t sz;
+
+	    if (grub_add (grub_strlen (suffix), grub_strlen (newsuffix), &sz) ||
+		grub_add (sz, 1, &sz))
+	      {
+		grub_errno = GRUB_ERR_OUT_OF_RANGE;
+		goto fail_0;
+	      }
+
 	    t = suffix;
-	    suffix = grub_realloc (suffix, grub_strlen (suffix)
-				   + grub_strlen (newsuffix) + 1);
+	    suffix = grub_realloc (suffix, sz);
 	    if (!suffix)
 	      {
 		grub_free (t);
+
+ fail_0:
 		grub_free (entrysrc);
 		grub_free (parsed);
 		grub_free (newsuffix);
@@ -154,13 +164,22 @@ legacy_file (const char *filename)
 	  else
 	    {
 	      char *t;
+	      grub_size_t sz;
+
+	      if (grub_add (grub_strlen (entrysrc), grub_strlen (parsed), &sz) ||
+		  grub_add (sz, 1, &sz))
+		{
+		  grub_errno = GRUB_ERR_OUT_OF_RANGE;
+		  goto fail_1;
+		}
 
 	      t = entrysrc;
-	      entrysrc = grub_realloc (entrysrc, grub_strlen (entrysrc)
-				       + grub_strlen (parsed) + 1);
+	      entrysrc = grub_realloc (entrysrc, sz);
 	      if (!entrysrc)
 		{
 		  grub_free (t);
+
+ fail_1:
 		  grub_free (parsed);
 		  grub_free (suffix);
 		  return grub_errno;
diff --git a/grub-core/commands/wildcard.c b/grub-core/commands/wildcard.c
index 4a106ca04..cc3290311 100644
--- a/grub-core/commands/wildcard.c
+++ b/grub-core/commands/wildcard.c
@@ -23,6 +23,7 @@
 #include <grub/file.h>
 #include <grub/device.h>
 #include <grub/script_sh.h>
+#include <grub/safemath.h>
 
 #include <regex.h>
 
@@ -48,6 +49,7 @@ merge (char **dest, char **ps)
   int i;
   int j;
   char **p;
+  grub_size_t sz;
 
   if (! dest)
     return ps;
@@ -60,7 +62,12 @@ merge (char **dest, char **ps)
   for (j = 0; ps[j]; j++)
     ;
 
-  p = grub_realloc (dest, sizeof (char*) * (i + j + 1));
+  if (grub_add (i, j, &sz) ||
+      grub_add (sz, 1, &sz) ||
+      grub_mul (sz, sizeof (char *), &sz))
+    return dest;
+
+  p = grub_realloc (dest, sz);
   if (! p)
     {
       grub_free (dest);
@@ -115,8 +122,15 @@ make_regex (const char *start, const char *end, regex_t *regexp)
   char ch;
   int i = 0;
   unsigned len = end - start;
-  char *buffer = grub_malloc (len * 2 + 2 + 1); /* worst case size. */
+  char *buffer;
+  grub_size_t sz;
 
+  /* Worst case size is (len * 2 + 2 + 1). */
+  if (grub_mul (len, 2, &sz) ||
+      grub_add (sz, 3, &sz))
+    return 1;
+
+  buffer = grub_malloc (sz);
   if (! buffer)
     return 1;
 
@@ -226,6 +240,7 @@ match_devices_iter (const char *name, void *data)
   struct match_devices_ctx *ctx = data;
   char **t;
   char *buffer;
+  grub_size_t sz;
 
   /* skip partitions if asked to. */
   if (ctx->noparts && grub_strchr (name, ','))
@@ -239,11 +254,16 @@ match_devices_iter (const char *name, void *data)
   if (regexec (ctx->regexp, buffer, 0, 0, 0))
     {
       grub_dprintf ("expand", "not matched\n");
+ fail:
       grub_free (buffer);
       return 0;
     }
 
-  t = grub_realloc (ctx->devs, sizeof (char*) * (ctx->ndev + 2));
+  if (grub_add (ctx->ndev, 2, &sz) ||
+      grub_mul (sz, sizeof (char *), &sz))
+    goto fail;
+
+  t = grub_realloc (ctx->devs, sz);
   if (! t)
     {
       grub_free (buffer);
@@ -300,6 +320,7 @@ match_files_iter (const char *name,
   struct match_files_ctx *ctx = data;
   char **t;
   char *buffer;
+  grub_size_t sz;
 
   /* skip . and .. names */
   if (grub_strcmp(".", name) == 0 || grub_strcmp("..", name) == 0)
@@ -315,9 +336,14 @@ match_files_iter (const char *name,
   if (! buffer)
     return 1;
 
-  t = grub_realloc (ctx->files, sizeof (char*) * (ctx->nfile + 2));
-  if (! t)
+  if (grub_add (ctx->nfile, 2, &sz) ||
+      grub_mul (sz, sizeof (char *), &sz))
+    goto fail;
+
+  t = grub_realloc (ctx->files, sz);
+  if (!t)
     {
+ fail:
       grub_free (buffer);
       return 1;
     }
diff --git a/grub-core/disk/ldm.c b/grub-core/disk/ldm.c
index e6323701a..58f8a53e1 100644
--- a/grub-core/disk/ldm.c
+++ b/grub-core/disk/ldm.c
@@ -25,6 +25,7 @@
 #include <grub/msdos_partition.h>
 #include <grub/gpt_partition.h>
 #include <grub/i18n.h>
+#include <grub/safemath.h>
 
 #ifdef GRUB_UTIL
 #include <grub/emu/misc.h>
@@ -289,6 +290,7 @@ make_vg (grub_disk_t disk,
       struct grub_ldm_vblk vblk[GRUB_DISK_SECTOR_SIZE
 				/ sizeof (struct grub_ldm_vblk)];
       unsigned i;
+      grub_size_t sz;
       err = grub_disk_read (disk, cursec, 0,
 			    sizeof(vblk), &vblk);
       if (err)
@@ -350,7 +352,13 @@ make_vg (grub_disk_t disk,
 	      grub_free (lv);
 	      goto fail2;
 	    }
-	  lv->name = grub_malloc (*ptr + 1);
+	  if (grub_add (*ptr, 1, &sz))
+	    {
+	      grub_free (lv->internal_id);
+	      grub_free (lv);
+	      goto fail2;
+	    }
+	  lv->name = grub_malloc (sz);
 	  if (!lv->name)
 	    {
 	      grub_free (lv->internal_id);
@@ -599,10 +607,13 @@ make_vg (grub_disk_t disk,
 	  if (lv->segments->node_alloc == lv->segments->node_count)
 	    {
 	      void *t;
-	      lv->segments->node_alloc *= 2; 
-	      t = grub_realloc (lv->segments->nodes,
-				sizeof (*lv->segments->nodes)
-				* lv->segments->node_alloc);
+	      grub_size_t sz;
+
+	      if (grub_mul (lv->segments->node_alloc, 2, &lv->segments->node_alloc) ||
+		  grub_mul (lv->segments->node_alloc, sizeof (*lv->segments->nodes), &sz))
+		goto fail2;
+
+	      t = grub_realloc (lv->segments->nodes, sz);
 	      if (!t)
 		goto fail2;
 	      lv->segments->nodes = t;
@@ -723,10 +734,13 @@ make_vg (grub_disk_t disk,
 	      if (comp->segment_alloc == comp->segment_count)
 		{
 		  void *t;
-		  comp->segment_alloc *= 2;
-		  t = grub_realloc (comp->segments,
-				    comp->segment_alloc
-				    * sizeof (*comp->segments));
+		  grub_size_t sz;
+
+		  if (grub_mul (comp->segment_alloc, 2, &comp->segment_alloc) ||
+		      grub_mul (comp->segment_alloc, sizeof (*comp->segments), &sz))
+		    goto fail2;
+
+		  t = grub_realloc (comp->segments, sz);
 		  if (!t)
 		    goto fail2;
 		  comp->segments = t;
diff --git a/grub-core/font/font.c b/grub-core/font/font.c
index 8e118b315..5edb477ac 100644
--- a/grub-core/font/font.c
+++ b/grub-core/font/font.c
@@ -30,6 +30,7 @@
 #include <grub/unicode.h>
 #include <grub/fontformat.h>
 #include <grub/env.h>
+#include <grub/safemath.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
@@ -360,9 +361,13 @@ static char *
 read_section_as_string (struct font_file_section *section)
 {
   char *str;
+  grub_size_t sz;
   grub_ssize_t ret;
 
-  str = grub_malloc (section->length + 1);
+  if (grub_add (section->length, 1, &sz))
+    return NULL;
+
+  str = grub_malloc (sz);
   if (!str)
     return 0;
 
diff --git a/grub-core/fs/btrfs.c b/grub-core/fs/btrfs.c
index 4b8380439..27339bdb3 100644
--- a/grub-core/fs/btrfs.c
+++ b/grub-core/fs/btrfs.c
@@ -40,6 +40,7 @@
 #include <grub/btrfs.h>
 #include <grub/crypto.h>
 #include <grub/diskfilter.h>
+#include <grub/safemath.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
@@ -331,9 +332,13 @@ save_ref (struct grub_btrfs_leaf_descriptor *desc,
   if (desc->allocated < desc->depth)
     {
       void *newdata;
-      desc->allocated *= 2;
-      newdata = grub_realloc (desc->data, sizeof (desc->data[0])
-			      * desc->allocated);
+      grub_size_t sz;
+
+      if (grub_mul (desc->allocated, 2, &desc->allocated) ||
+	  grub_mul (desc->allocated, sizeof (desc->data[0]), &sz))
+	return GRUB_ERR_OUT_OF_RANGE;
+
+      newdata = grub_realloc (desc->data, sz);
       if (!newdata)
 	return grub_errno;
       desc->data = newdata;
@@ -624,16 +629,21 @@ find_device (struct grub_btrfs_data *data, grub_uint64_t id)
   if (data->n_devices_attached > data->n_devices_allocated)
     {
       void *tmp;
-      data->n_devices_allocated = 2 * data->n_devices_attached + 1;
-      data->devices_attached
-	= grub_realloc (tmp = data->devices_attached,
-			data->n_devices_allocated
-			* sizeof (data->devices_attached[0]));
+      grub_size_t sz;
+
+      if (grub_mul (data->n_devices_attached, 2, &data->n_devices_allocated) ||
+	  grub_add (data->n_devices_allocated, 1, &data->n_devices_allocated) ||
+	  grub_mul (data->n_devices_allocated, sizeof (data->devices_attached[0]), &sz))
+	goto fail;
+
+      data->devices_attached = grub_realloc (tmp = data->devices_attached, sz);
       if (!data->devices_attached)
 	{
+	  data->devices_attached = tmp;
+
+ fail:
 	  if (ctx.dev_found)
 	    grub_device_close (ctx.dev_found);
-	  data->devices_attached = tmp;
 	  return NULL;
 	}
     }
diff --git a/grub-core/fs/ext2.c b/grub-core/fs/ext2.c
index 9b389802a..ac33bcd68 100644
--- a/grub-core/fs/ext2.c
+++ b/grub-core/fs/ext2.c
@@ -46,6 +46,7 @@
 #include <grub/dl.h>
 #include <grub/types.h>
 #include <grub/fshelp.h>
+#include <grub/safemath.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
@@ -703,6 +704,7 @@ grub_ext2_read_symlink (grub_fshelp_node_t node)
 {
   char *symlink;
   struct grub_fshelp_node *diro = node;
+  grub_size_t sz;
 
   if (! diro->inode_read)
     {
@@ -717,7 +719,13 @@ grub_ext2_read_symlink (grub_fshelp_node_t node)
        }
     }
 
-  symlink = grub_malloc (grub_le_to_cpu32 (diro->inode.size) + 1);
+  if (grub_add (grub_le_to_cpu32 (diro->inode.size), 1, &sz))
+    {
+      grub_error (GRUB_ERR_OUT_OF_RANGE, N_("overflow is detected"));
+      return NULL;
+    }
+
+  symlink = grub_malloc (sz);
   if (! symlink)
     return 0;
 
diff --git a/grub-core/fs/iso9660.c b/grub-core/fs/iso9660.c
index 4f1b52a55..7ba5b300b 100644
--- a/grub-core/fs/iso9660.c
+++ b/grub-core/fs/iso9660.c
@@ -28,6 +28,7 @@
 #include <grub/fshelp.h>
 #include <grub/charset.h>
 #include <grub/datetime.h>
+#include <grub/safemath.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
@@ -531,8 +532,13 @@ add_part (struct iterate_dir_ctx *ctx,
 	  int len2)
 {
   int size = ctx->symlink ? grub_strlen (ctx->symlink) : 0;
+  grub_size_t sz;
 
-  ctx->symlink = grub_realloc (ctx->symlink, size + len2 + 1);
+  if (grub_add (size, len2, &sz) ||
+      grub_add (sz, 1, &sz))
+    return;
+
+  ctx->symlink = grub_realloc (ctx->symlink, sz);
   if (! ctx->symlink)
     return;
 
@@ -560,17 +566,24 @@ susp_iterate_dir (struct grub_iso9660_susp_entry *entry,
 	{
 	  grub_size_t off = 0, csize = 1;
 	  char *old;
+	  grub_size_t sz;
+
 	  csize = entry->len - 5;
 	  old = ctx->filename;
 	  if (ctx->filename_alloc)
 	    {
 	      off = grub_strlen (ctx->filename);
-	      ctx->filename = grub_realloc (ctx->filename, csize + off + 1);
+	      if (grub_add (csize, off, &sz) ||
+		  grub_add (sz, 1, &sz))
+		return GRUB_ERR_OUT_OF_RANGE;
+	      ctx->filename = grub_realloc (ctx->filename, sz);
 	    }
 	  else
 	    {
 	      off = 0;
-	      ctx->filename = grub_zalloc (csize + 1);
+	      if (grub_add (csize, 1, &sz))
+		return GRUB_ERR_OUT_OF_RANGE;
+	      ctx->filename = grub_zalloc (sz);
 	    }
 	  if (!ctx->filename)
 	    {
@@ -776,14 +789,18 @@ grub_iso9660_iterate_dir (grub_fshelp_node_t dir,
 	    if (node->have_dirents >= node->alloc_dirents)
 	      {
 		struct grub_fshelp_node *new_node;
-		node->alloc_dirents *= 2;
-		new_node = grub_realloc (node, 
-					 sizeof (struct grub_fshelp_node)
-					 + ((node->alloc_dirents
-					     - ARRAY_SIZE (node->dirents))
-					    * sizeof (node->dirents[0])));
+		grub_size_t sz;
+
+		if (grub_mul (node->alloc_dirents, 2, &node->alloc_dirents) ||
+		    grub_sub (node->alloc_dirents, ARRAY_SIZE (node->dirents), &sz) ||
+		    grub_mul (sz, sizeof (node->dirents[0]), &sz) ||
+		    grub_add (sz, sizeof (struct grub_fshelp_node), &sz))
+		  goto fail_0;
+
+		new_node = grub_realloc (node, sz);
 		if (!new_node)
 		  {
+ fail_0:
 		    if (ctx.filename_alloc)
 		      grub_free (ctx.filename);
 		    grub_free (node);
@@ -799,14 +816,18 @@ grub_iso9660_iterate_dir (grub_fshelp_node_t dir,
 		* sizeof (node->dirents[0]) < grub_strlen (ctx.symlink) + 1)
 	      {
 		struct grub_fshelp_node *new_node;
-		new_node = grub_realloc (node,
-					 sizeof (struct grub_fshelp_node)
-					 + ((node->alloc_dirents
-					     - ARRAY_SIZE (node->dirents))
-					    * sizeof (node->dirents[0]))
-					 + grub_strlen (ctx.symlink) + 1);
+		grub_size_t sz;
+
+		if (grub_sub (node->alloc_dirents, ARRAY_SIZE (node->dirents), &sz) ||
+		    grub_mul (sz, sizeof (node->dirents[0]), &sz) ||
+		    grub_add (sz, sizeof (struct grub_fshelp_node) + 1, &sz) ||
+		    grub_add (sz, grub_strlen (ctx.symlink), &sz))
+		  goto fail_1;
+
+		new_node = grub_realloc (node, sz);
 		if (!new_node)
 		  {
+ fail_1:
 		    if (ctx.filename_alloc)
 		      grub_free (ctx.filename);
 		    grub_free (node);
diff --git a/grub-core/fs/sfs.c b/grub-core/fs/sfs.c
index 90f7fb379..de2b107a4 100644
--- a/grub-core/fs/sfs.c
+++ b/grub-core/fs/sfs.c
@@ -26,6 +26,7 @@
 #include <grub/types.h>
 #include <grub/fshelp.h>
 #include <grub/charset.h>
+#include <grub/safemath.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
@@ -307,10 +308,15 @@ grub_sfs_read_block (grub_fshelp_node_t node, grub_disk_addr_t fileblock)
       if (node->cache && node->cache_size >= node->cache_allocated)
 	{
 	  struct cache_entry *e = node->cache;
-	  e = grub_realloc (node->cache,node->cache_allocated * 2
-			    * sizeof (e[0]));
+	  grub_size_t sz;
+
+	  if (grub_mul (node->cache_allocated, 2 * sizeof (e[0]), &sz))
+	    goto fail;
+
+	  e = grub_realloc (node->cache, sz);
 	  if (!e)
 	    {
+ fail:
 	      grub_errno = 0;
 	      grub_free (node->cache);
 	      node->cache = 0;
@@ -477,10 +483,16 @@ grub_sfs_create_node (struct grub_fshelp_node **node,
   grub_size_t len = grub_strlen (name);
   grub_uint8_t *name_u8;
   int ret;
+  grub_size_t sz;
+
+  if (grub_mul (len, GRUB_MAX_UTF8_PER_LATIN1, &sz) ||
+      grub_add (sz, 1, &sz))
+    return 1;
+
   *node = grub_malloc (sizeof (**node));
   if (!*node)
     return 1;
-  name_u8 = grub_malloc (len * GRUB_MAX_UTF8_PER_LATIN1 + 1);
+  name_u8 = grub_malloc (sz);
   if (!name_u8)
     {
       grub_free (*node);
@@ -724,8 +736,13 @@ grub_sfs_label (grub_device_t device, char **label)
   data = grub_sfs_mount (disk);
   if (data)
     {
-      grub_size_t len = grub_strlen (data->label);
-      *label = grub_malloc (len * GRUB_MAX_UTF8_PER_LATIN1 + 1);
+      grub_size_t sz, len = grub_strlen (data->label);
+
+      if (grub_mul (len, GRUB_MAX_UTF8_PER_LATIN1, &sz) ||
+	  grub_add (sz, 1, &sz))
+	return GRUB_ERR_OUT_OF_RANGE;
+
+      *label = grub_malloc (sz);
       if (*label)
 	*grub_latin1_to_utf8 ((grub_uint8_t *) *label,
 			      (const grub_uint8_t *) data->label,
diff --git a/grub-core/fs/squash4.c b/grub-core/fs/squash4.c
index 95d5c1e1f..785123894 100644
--- a/grub-core/fs/squash4.c
+++ b/grub-core/fs/squash4.c
@@ -26,6 +26,7 @@
 #include <grub/types.h>
 #include <grub/fshelp.h>
 #include <grub/deflate.h>
+#include <grub/safemath.h>
 #include <minilzo.h>
 
 #include "xz.h"
@@ -459,7 +460,17 @@ grub_squash_read_symlink (grub_fshelp_node_t node)
 {
   char *ret;
   grub_err_t err;
-  ret = grub_malloc (grub_le_to_cpu32 (node->ino.symlink.namelen) + 1);
+  grub_size_t sz;
+
+  if (grub_add (grub_le_to_cpu32 (node->ino.symlink.namelen), 1, &sz))
+    {
+      grub_error (GRUB_ERR_OUT_OF_RANGE, N_("overflow is detected"));
+      return NULL;
+    }
+
+  ret = grub_malloc (sz);
+  if (!ret)
+    return NULL;
 
   err = read_chunk (node->data, ret,
 		    grub_le_to_cpu32 (node->ino.symlink.namelen),
@@ -506,11 +517,16 @@ grub_squash_iterate_dir (grub_fshelp_node_t dir,
 
   {
     grub_fshelp_node_t node;
-    node = grub_malloc (sizeof (*node) + dir->stsize * sizeof (dir->stack[0]));
+    grub_size_t sz;
+
+    if (grub_mul (dir->stsize, sizeof (dir->stack[0]), &sz) ||
+	grub_add (sz, sizeof (*node), &sz))
+      return 0;
+
+    node = grub_malloc (sz);
     if (!node)
       return 0;
-    grub_memcpy (node, dir,
-		 sizeof (*node) + dir->stsize * sizeof (dir->stack[0]));
+    grub_memcpy (node, dir, sz);
     if (hook (".", GRUB_FSHELP_DIR, node, hook_data))
       return 1;
 
@@ -518,12 +534,15 @@ grub_squash_iterate_dir (grub_fshelp_node_t dir,
       {
 	grub_err_t err;
 
-	node = grub_malloc (sizeof (*node) + dir->stsize * sizeof (dir->stack[0]));
+	if (grub_mul (dir->stsize, sizeof (dir->stack[0]), &sz) ||
+	    grub_add (sz, sizeof (*node), &sz))
+	  return 0;
+
+	node = grub_malloc (sz);
 	if (!node)
 	  return 0;
 
-	grub_memcpy (node, dir,
-		     sizeof (*node) + dir->stsize * sizeof (dir->stack[0]));
+	grub_memcpy (node, dir, sz);
 
 	node->stsize--;
 	err = read_chunk (dir->data, &node->ino, sizeof (node->ino),
@@ -557,6 +576,7 @@ grub_squash_iterate_dir (grub_fshelp_node_t dir,
 	  enum grub_fshelp_filetype filetype = GRUB_FSHELP_REG;
 	  struct grub_squash_dirent di;
 	  struct grub_squash_inode ino;
+	  grub_size_t sz;
 
 	  err = read_chunk (dir->data, &di, sizeof (di),
 			    grub_le_to_cpu64 (dir->data->sb.diroffset)
@@ -589,13 +609,16 @@ grub_squash_iterate_dir (grub_fshelp_node_t dir,
 	  if (grub_le_to_cpu16 (di.type) == SQUASH_TYPE_SYMLINK)
 	    filetype = GRUB_FSHELP_SYMLINK;
 
-	  node = grub_malloc (sizeof (*node)
-			      + (dir->stsize + 1) * sizeof (dir->stack[0]));
+	  if (grub_add (dir->stsize, 1, &sz) ||
+	      grub_mul (sz, sizeof (dir->stack[0]), &sz) ||
+	      grub_add (sz, sizeof (*node), &sz))
+	    return 0;
+
+	  node = grub_malloc (sz);
 	  if (! node)
 	    return 0;
 
-	  grub_memcpy (node, dir,
-		       sizeof (*node) + dir->stsize * sizeof (dir->stack[0]));
+	  grub_memcpy (node, dir, sz - sizeof(dir->stack[0]));
 
 	  node->ino = ino;
 	  node->stack[node->stsize].ino_chunk = grub_le_to_cpu32 (dh.ino_chunk);
diff --git a/grub-core/fs/udf.c b/grub-core/fs/udf.c
index a83761674..21ac7f446 100644
--- a/grub-core/fs/udf.c
+++ b/grub-core/fs/udf.c
@@ -28,6 +28,7 @@
 #include <grub/charset.h>
 #include <grub/datetime.h>
 #include <grub/udf.h>
+#include <grub/safemath.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
@@ -890,9 +891,19 @@ read_string (const grub_uint8_t *raw, grub_size_t sz, char *outbuf)
 	utf16[i] = (raw[2 * i + 1] << 8) | raw[2*i + 2];
     }
   if (!outbuf)
-    outbuf = grub_malloc (utf16len * GRUB_MAX_UTF8_PER_UTF16 + 1);
+    {
+      grub_size_t size;
+
+      if (grub_mul (utf16len, GRUB_MAX_UTF8_PER_UTF16, &size) ||
+	  grub_add (size, 1, &size))
+	goto fail;
+
+      outbuf = grub_malloc (size);
+    }
   if (outbuf)
     *grub_utf16_to_utf8 ((grub_uint8_t *) outbuf, utf16, utf16len) = '\0';
+
+ fail:
   grub_free (utf16);
   return outbuf;
 }
@@ -1005,7 +1016,7 @@ grub_udf_read_symlink (grub_fshelp_node_t node)
   grub_size_t sz = U64 (node->block.fe.file_size);
   grub_uint8_t *raw;
   const grub_uint8_t *ptr;
-  char *out, *optr;
+  char *out = NULL, *optr;
 
   if (sz < 4)
     return NULL;
@@ -1013,14 +1024,16 @@ grub_udf_read_symlink (grub_fshelp_node_t node)
   if (!raw)
     return NULL;
   if (grub_udf_read_file (node, NULL, NULL, 0, sz, (char *) raw) < 0)
-    {
-      grub_free (raw);
-      return NULL;
-    }
+    goto fail_1;
 
-  out = grub_malloc (sz * 2 + 1);
+  if (grub_mul (sz, 2, &sz) ||
+      grub_add (sz, 1, &sz))
+    goto fail_0;
+
+  out = grub_malloc (sz);
   if (!out)
     {
+ fail_0:
       grub_free (raw);
       return NULL;
     }
@@ -1031,17 +1044,17 @@ grub_udf_read_symlink (grub_fshelp_node_t node)
     {
       grub_size_t s;
       if ((grub_size_t) (ptr - raw + 4) > sz)
-	goto fail;
+	goto fail_1;
       if (!(ptr[2] == 0 && ptr[3] == 0))
-	goto fail;
+	goto fail_1;
       s = 4 + ptr[1];
       if ((grub_size_t) (ptr - raw + s) > sz)
-	goto fail;
+	goto fail_1;
       switch (*ptr)
 	{
 	case 1:
 	  if (ptr[1])
-	    goto fail;
+	    goto fail_1;
 	  /* Fallthrough.  */
 	case 2:
 	  /* in 4 bytes. out: 1 byte.  */
@@ -1066,11 +1079,11 @@ grub_udf_read_symlink (grub_fshelp_node_t node)
 	  if (optr != out)
 	    *optr++ = '/';
 	  if (!read_string (ptr + 4, s - 4, optr))
-	    goto fail;
+	    goto fail_1;
 	  optr += grub_strlen (optr);
 	  break;
 	default:
-	  goto fail;
+	  goto fail_1;
 	}
       ptr += s;
     }
@@ -1078,7 +1091,7 @@ grub_udf_read_symlink (grub_fshelp_node_t node)
   grub_free (raw);
   return out;
 
- fail:
+ fail_1:
   grub_free (raw);
   grub_free (out);
   grub_error (GRUB_ERR_BAD_FS, "invalid symlink");
diff --git a/grub-core/fs/xfs.c b/grub-core/fs/xfs.c
index 96ffecbfc..ea6590290 100644
--- a/grub-core/fs/xfs.c
+++ b/grub-core/fs/xfs.c
@@ -25,6 +25,7 @@
 #include <grub/dl.h>
 #include <grub/types.h>
 #include <grub/fshelp.h>
+#include <grub/safemath.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
@@ -899,6 +900,7 @@ static struct grub_xfs_data *
 grub_xfs_mount (grub_disk_t disk)
 {
   struct grub_xfs_data *data = 0;
+  grub_size_t sz;
 
   data = grub_zalloc (sizeof (struct grub_xfs_data));
   if (!data)
@@ -913,10 +915,11 @@ grub_xfs_mount (grub_disk_t disk)
   if (!grub_xfs_sb_valid(data))
     goto fail;
 
-  data = grub_realloc (data,
-		       sizeof (struct grub_xfs_data)
-		       - sizeof (struct grub_xfs_inode)
-		       + grub_xfs_inode_size(data) + 1);
+  if (grub_add (grub_xfs_inode_size (data),
+      sizeof (struct grub_xfs_data) - sizeof (struct grub_xfs_inode) + 1, &sz))
+    goto fail;
+
+  data = grub_realloc (data, sz);
 
   if (! data)
     goto fail;
diff --git a/grub-core/fs/zfs/zfs.c b/grub-core/fs/zfs/zfs.c
index 381dde556..36d0373a6 100644
--- a/grub-core/fs/zfs/zfs.c
+++ b/grub-core/fs/zfs/zfs.c
@@ -55,6 +55,7 @@
 #include <grub/deflate.h>
 #include <grub/crypto.h>
 #include <grub/i18n.h>
+#include <grub/safemath.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
@@ -773,11 +774,14 @@ fill_vdev_info (struct grub_zfs_data *data,
   if (data->n_devices_attached > data->n_devices_allocated)
     {
       void *tmp;
-      data->n_devices_allocated = 2 * data->n_devices_attached + 1;
-      data->devices_attached
-	= grub_realloc (tmp = data->devices_attached,
-			data->n_devices_allocated
-			* sizeof (data->devices_attached[0]));
+      grub_size_t sz;
+
+      if (grub_mul (data->n_devices_attached, 2, &data->n_devices_allocated) ||
+	  grub_add (data->n_devices_allocated, 1, &data->n_devices_allocated) ||
+	  grub_mul (data->n_devices_allocated, sizeof (data->devices_attached[0]), &sz))
+	return GRUB_ERR_OUT_OF_RANGE;
+
+      data->devices_attached = grub_realloc (tmp = data->devices_attached, sz);
       if (!data->devices_attached)
 	{
 	  data->devices_attached = tmp;
@@ -3468,14 +3472,18 @@ grub_zfs_nvlist_lookup_nvlist (const char *nvlist, const char *name)
 {
   char *nvpair;
   char *ret;
-  grub_size_t size;
+  grub_size_t size, sz;
   int found;
 
   found = nvlist_find_value (nvlist, name, DATA_TYPE_NVLIST, &nvpair,
 			     &size, 0);
   if (!found)
     return 0;
-  ret = grub_zalloc (size + 3 * sizeof (grub_uint32_t));
+
+  if (grub_add (size, 3 * sizeof (grub_uint32_t), &sz))
+      return 0;
+
+  ret = grub_zalloc (sz);
   if (!ret)
     return 0;
   grub_memcpy (ret, nvlist, sizeof (grub_uint32_t));
diff --git a/grub-core/fs/zfs/zfscrypt.c b/grub-core/fs/zfs/zfscrypt.c
index 1402e0bc2..de3b015f5 100644
--- a/grub-core/fs/zfs/zfscrypt.c
+++ b/grub-core/fs/zfs/zfscrypt.c
@@ -22,6 +22,7 @@
 #include <grub/misc.h>
 #include <grub/disk.h>
 #include <grub/partition.h>
+#include <grub/safemath.h>
 #include <grub/dl.h>
 #include <grub/types.h>
 #include <grub/zfs/zfs.h>
@@ -82,9 +83,13 @@ grub_zfs_add_key (grub_uint8_t *key_in,
 		  int passphrase)
 {
   struct grub_zfs_wrap_key *key;
+  grub_size_t sz;
+
   if (!passphrase && keylen > 32)
     keylen = 32;
-  key = grub_malloc (sizeof (*key) + keylen);
+  if (grub_add (sizeof (*key), keylen, &sz))
+    return GRUB_ERR_OUT_OF_RANGE;
+  key = grub_malloc (sz);
   if (!key)
     return grub_errno;
   key->is_passphrase = passphrase;
diff --git a/grub-core/lib/arg.c b/grub-core/lib/arg.c
index fd7744a6f..3288609a5 100644
--- a/grub-core/lib/arg.c
+++ b/grub-core/lib/arg.c
@@ -23,6 +23,7 @@
 #include <grub/term.h>
 #include <grub/extcmd.h>
 #include <grub/i18n.h>
+#include <grub/safemath.h>
 
 /* Built-in parser for default options.  */
 static const struct grub_arg_option help_options[] =
@@ -216,7 +217,13 @@ static inline grub_err_t
 add_arg (char ***argl, int *num, char *s)
 {
   char **p = *argl;
-  *argl = grub_realloc (*argl, (++(*num) + 1) * sizeof (char *));
+  grub_size_t sz;
+
+  if (grub_add (++(*num), 1, &sz) ||
+      grub_mul (sz, sizeof (char *), &sz))
+    return grub_error (GRUB_ERR_OUT_OF_RANGE, N_("overflow is detected"));
+
+  *argl = grub_realloc (*argl, sz);
   if (! *argl)
     {
       grub_free (p);
@@ -431,6 +438,7 @@ grub_arg_list_alloc(grub_extcmd_t extcmd, int argc,
   grub_size_t argcnt;
   struct grub_arg_list *list;
   const struct grub_arg_option *options;
+  grub_size_t sz0, sz1;
 
   options = extcmd->options;
   if (! options)
@@ -443,7 +451,15 @@ grub_arg_list_alloc(grub_extcmd_t extcmd, int argc,
 	argcnt += ((grub_size_t) argc + 1) / 2 + 1; /* max possible for any option */
     }
 
-  list = grub_zalloc (sizeof (*list) * i + sizeof (char*) * argcnt);
+  if (grub_mul (sizeof (*list), i, &sz0) ||
+      grub_mul (sizeof (char *), argcnt, &sz1) ||
+      grub_add (sz0, sz1, &sz0))
+    {
+      grub_error (GRUB_ERR_OUT_OF_RANGE, N_("overflow is detected"));
+      return 0;
+    }
+
+  list = grub_zalloc (sz0);
   if (! list)
     return 0;
 
diff --git a/grub-core/loader/i386/bsd.c b/grub-core/loader/i386/bsd.c
index 3730ed382..b92cbe98d 100644
--- a/grub-core/loader/i386/bsd.c
+++ b/grub-core/loader/i386/bsd.c
@@ -35,6 +35,7 @@
 #include <grub/ns8250.h>
 #include <grub/bsdlabel.h>
 #include <grub/crypto.h>
+#include <grub/safemath.h>
 #include <grub/verify.h>
 #ifdef GRUB_MACHINE_PCBIOS
 #include <grub/machine/int.h>
@@ -1012,11 +1013,16 @@ grub_netbsd_add_modules (void)
   struct grub_netbsd_btinfo_modules *mods;
   unsigned i;
   grub_err_t err;
+  grub_size_t sz;
 
   for (mod = netbsd_mods; mod; mod = mod->next)
     modcnt++;
 
-  mods = grub_malloc (sizeof (*mods) + sizeof (mods->mods[0]) * modcnt);
+  if (grub_mul (modcnt, sizeof (mods->mods[0]), &sz) ||
+      grub_add (sz, sizeof (*mods), &sz))
+    return GRUB_ERR_OUT_OF_RANGE;
+
+  mods = grub_malloc (sz);
   if (!mods)
     return grub_errno;
 
diff --git a/grub-core/net/dns.c b/grub-core/net/dns.c
index e332d5eb4..906ec7d67 100644
--- a/grub-core/net/dns.c
+++ b/grub-core/net/dns.c
@@ -22,6 +22,7 @@
 #include <grub/i18n.h>
 #include <grub/err.h>
 #include <grub/time.h>
+#include <grub/safemath.h>
 
 struct dns_cache_element
 {
@@ -51,9 +52,15 @@ grub_net_add_dns_server (const struct grub_net_network_level_address *s)
     {
       int na = dns_servers_alloc * 2;
       struct grub_net_network_level_address *ns;
+      grub_size_t sz;
+
       if (na < 8)
 	na = 8;
-      ns = grub_realloc (dns_servers, na * sizeof (ns[0]));
+
+      if (grub_mul (na, sizeof (ns[0]), &sz))
+	return GRUB_ERR_OUT_OF_RANGE;
+
+      ns = grub_realloc (dns_servers, sz);
       if (!ns)
 	return grub_errno;
       dns_servers_alloc = na;
diff --git a/grub-core/normal/charset.c b/grub-core/normal/charset.c
index d57fb72fa..4dfcc3107 100644
--- a/grub-core/normal/charset.c
+++ b/grub-core/normal/charset.c
@@ -48,6 +48,7 @@
 #include <grub/unicode.h>
 #include <grub/term.h>
 #include <grub/normal.h>
+#include <grub/safemath.h>
 
 #if HAVE_FONT_SOURCE
 #include "widthspec.h"
@@ -464,6 +465,7 @@ grub_unicode_aglomerate_comb (const grub_uint32_t *in, grub_size_t inlen,
 	{
 	  struct grub_unicode_combining *n;
 	  unsigned j;
+	  grub_size_t sz;
 
 	  if (!haveout)
 	    continue;
@@ -477,10 +479,14 @@ grub_unicode_aglomerate_comb (const grub_uint32_t *in, grub_size_t inlen,
 	    n = out->combining_inline;
 	  else if (out->ncomb > (int) ARRAY_SIZE (out->combining_inline))
 	    {
-	      n = grub_realloc (out->combining_ptr,
-				sizeof (n[0]) * (out->ncomb + 1));
+	      if (grub_add (out->ncomb, 1, &sz) ||
+		  grub_mul (sz, sizeof (n[0]), &sz))
+		goto fail;
+
+	      n = grub_realloc (out->combining_ptr, sz);
 	      if (!n)
 		{
+ fail:
 		  grub_errno = GRUB_ERR_NONE;
 		  continue;
 		}
diff --git a/grub-core/normal/cmdline.c b/grub-core/normal/cmdline.c
index c57242e2e..de03fe63b 100644
--- a/grub-core/normal/cmdline.c
+++ b/grub-core/normal/cmdline.c
@@ -28,6 +28,7 @@
 #include <grub/env.h>
 #include <grub/i18n.h>
 #include <grub/charset.h>
+#include <grub/safemath.h>
 
 static grub_uint32_t *kill_buf;
 
@@ -307,12 +308,21 @@ cl_insert (struct cmdline_term *cl_terms, unsigned nterms,
   if (len + (*llen) >= (*max_len))
     {
       grub_uint32_t *nbuf;
-      (*max_len) *= 2;
-      nbuf = grub_realloc ((*buf), sizeof (grub_uint32_t) * (*max_len));
+      grub_size_t sz;
+
+      if (grub_mul (*max_len, 2, max_len) ||
+	  grub_mul (*max_len, sizeof (grub_uint32_t), &sz))
+	{
+	  grub_errno = GRUB_ERR_OUT_OF_RANGE;
+	  goto fail;
+	}
+
+      nbuf = grub_realloc ((*buf), sz);
       if (nbuf)
 	(*buf) = nbuf;
       else
 	{
+ fail:
 	  grub_print_error ();
 	  grub_errno = GRUB_ERR_NONE;
 	  (*max_len) /= 2;
diff --git a/grub-core/normal/menu_entry.c b/grub-core/normal/menu_entry.c
index 1993995be..50eef918c 100644
--- a/grub-core/normal/menu_entry.c
+++ b/grub-core/normal/menu_entry.c
@@ -27,6 +27,7 @@
 #include <grub/auth.h>
 #include <grub/i18n.h>
 #include <grub/charset.h>
+#include <grub/safemath.h>
 
 enum update_mode
   {
@@ -113,10 +114,18 @@ ensure_space (struct line *linep, int extra)
 {
   if (linep->max_len < linep->len + extra)
     {
-      linep->max_len = 2 * (linep->len + extra);
-      linep->buf = grub_realloc (linep->buf, (linep->max_len + 1) * sizeof (linep->buf[0]));
+      grub_size_t sz0, sz1;
+
+      if (grub_add (linep->len, extra, &sz0) ||
+	  grub_mul (sz0, 2, &sz0) ||
+	  grub_add (sz0, 1, &sz1) ||
+	  grub_mul (sz1, sizeof (linep->buf[0]), &sz1))
+	return 0;
+
+      linep->buf = grub_realloc (linep->buf, sz1);
       if (! linep->buf)
 	return 0;
+      linep->max_len = sz0;
     }
 
   return 1;
diff --git a/grub-core/script/argv.c b/grub-core/script/argv.c
index 217ec5d1e..5751fdd57 100644
--- a/grub-core/script/argv.c
+++ b/grub-core/script/argv.c
@@ -20,6 +20,7 @@
 #include <grub/mm.h>
 #include <grub/misc.h>
 #include <grub/script_sh.h>
+#include <grub/safemath.h>
 
 /* Return nearest power of two that is >= v.  */
 static unsigned
@@ -81,11 +82,16 @@ int
 grub_script_argv_next (struct grub_script_argv *argv)
 {
   char **p = argv->args;
+  grub_size_t sz;
 
   if (argv->args && argv->argc && argv->args[argv->argc - 1] == 0)
     return 0;
 
-  p = grub_realloc (p, round_up_exp ((argv->argc + 2) * sizeof (char *)));
+  if (grub_add (argv->argc, 2, &sz) ||
+      grub_mul (sz, sizeof (char *), &sz))
+    return 1;
+
+  p = grub_realloc (p, round_up_exp (sz));
   if (! p)
     return 1;
 
@@ -105,13 +111,19 @@ grub_script_argv_append (struct grub_script_argv *argv, const char *s,
 {
   grub_size_t a;
   char *p = argv->args[argv->argc - 1];
+  grub_size_t sz;
 
   if (! s)
     return 0;
 
   a = p ? grub_strlen (p) : 0;
 
-  p = grub_realloc (p, round_up_exp ((a + slen + 1) * sizeof (char)));
+  if (grub_add (a, slen, &sz) ||
+      grub_add (sz, 1, &sz) ||
+      grub_mul (sz, sizeof (char), &sz))
+    return 1;
+
+  p = grub_realloc (p, round_up_exp (sz));
   if (! p)
     return 1;
 
diff --git a/grub-core/script/lexer.c b/grub-core/script/lexer.c
index c6bd3172f..5fb0cbd0b 100644
--- a/grub-core/script/lexer.c
+++ b/grub-core/script/lexer.c
@@ -24,6 +24,7 @@
 #include <grub/mm.h>
 #include <grub/script_sh.h>
 #include <grub/i18n.h>
+#include <grub/safemath.h>
 
 #define yytext_ptr char *
 #include "grub_script.tab.h"
@@ -110,10 +111,14 @@ grub_script_lexer_record (struct grub_parser_param *parser, char *str)
       old = lexer->recording;
       if (lexer->recordlen < len)
 	lexer->recordlen = len;
-      lexer->recordlen *= 2;
+
+      if (grub_mul (lexer->recordlen, 2, &lexer->recordlen))
+	goto fail;
+
       lexer->recording = grub_realloc (lexer->recording, lexer->recordlen);
       if (!lexer->recording)
 	{
+ fail:
 	  grub_free (old);
 	  lexer->recordpos = 0;
 	  lexer->recordlen = 0;
@@ -130,7 +135,7 @@ int
 grub_script_lexer_yywrap (struct grub_parser_param *parserstate,
 			  const char *input)
 {
-  grub_size_t len = 0;
+  grub_size_t len = 0, sz;
   char *p = 0;
   char *line = 0;
   YY_BUFFER_STATE buffer;
@@ -168,12 +173,22 @@ grub_script_lexer_yywrap (struct grub_parser_param *parserstate,
     }
   else if (len && line[len - 1] != '\n')
     {
-      p = grub_realloc (line, len + 2);
+      if (grub_add (len, 2, &sz))
+	{
+	  grub_free (line);
+	  grub_script_yyerror (parserstate, N_("overflow is detected"));
+	  return 1;
+	}
+
+      p = grub_realloc (line, sz);
       if (p)
 	{
 	  p[len++] = '\n';
 	  p[len] = '\0';
 	}
+      else
+	grub_free (line);
+
       line = p;
     }
 
diff --git a/grub-core/video/bitmap.c b/grub-core/video/bitmap.c
index b2e031566..6256e209a 100644
--- a/grub-core/video/bitmap.c
+++ b/grub-core/video/bitmap.c
@@ -23,6 +23,7 @@
 #include <grub/mm.h>
 #include <grub/misc.h>
 #include <grub/i18n.h>
+#include <grub/safemath.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
@@ -58,7 +59,7 @@ grub_video_bitmap_create (struct grub_video_bitmap **bitmap,
                           enum grub_video_blit_format blit_format)
 {
   struct grub_video_mode_info *mode_info;
-  unsigned int size;
+  grub_size_t size;
 
   if (!bitmap)
     return grub_error (GRUB_ERR_BUG, "invalid argument");
@@ -137,19 +138,25 @@ grub_video_bitmap_create (struct grub_video_bitmap **bitmap,
 
   mode_info->pitch = width * mode_info->bytes_per_pixel;
 
-  /* Calculate size needed for the data.  */
-  size = (width * mode_info->bytes_per_pixel) * height;
+  /* Calculate size needed for the data. */
+  if (grub_mul (width, mode_info->bytes_per_pixel, &size) ||
+      grub_mul (size, height, &size))
+    {
+      grub_error (GRUB_ERR_OUT_OF_RANGE, N_("overflow is detected"));
+      goto fail;
+    }
 
   (*bitmap)->data = grub_zalloc (size);
   if (! (*bitmap)->data)
-    {
-      grub_free (*bitmap);
-      *bitmap = 0;
-
-      return grub_errno;
-    }
+    goto fail;
 
   return GRUB_ERR_NONE;
+
+ fail:
+  grub_free (*bitmap);
+  *bitmap = NULL;
+
+  return grub_errno;
 }
 
 /* Frees all resources allocated by bitmap.  */
diff --git a/grub-core/video/readers/png.c b/grub-core/video/readers/png.c
index 61bd64537..0157ff742 100644
--- a/grub-core/video/readers/png.c
+++ b/grub-core/video/readers/png.c
@@ -23,6 +23,7 @@
 #include <grub/mm.h>
 #include <grub/misc.h>
 #include <grub/bufio.h>
+#include <grub/safemath.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
@@ -301,9 +302,17 @@ grub_png_decode_image_header (struct grub_png_data *data)
       data->bpp <<= 1;
 
   data->color_bits = color_bits;
-  data->row_bytes = data->image_width * data->bpp;
+
+  if (grub_mul (data->image_width, data->bpp, &data->row_bytes))
+    return grub_error (GRUB_ERR_OUT_OF_RANGE, N_("overflow is detected"));
+
   if (data->color_bits <= 4)
-    data->row_bytes = (data->image_width * data->color_bits + 7) / 8;
+    {
+      if (grub_mul (data->image_width, data->color_bits + 7, &data->row_bytes))
+	return grub_error (GRUB_ERR_OUT_OF_RANGE, N_("overflow is detected"));
+
+      data->row_bytes >>= 3;
+    }
 
 #ifndef GRUB_CPU_WORDS_BIGENDIAN
   if (data->is_16bit || data->is_gray || data->is_palette)

From 99c176e216b7196ac8d2af2b9bc483070b1a170a Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Sat, 4 Jul 2020 12:25:09 -0400
Subject: iso9660: Don't leak memory on realloc() failures

Signed-off-by: Peter Jones <pjones@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/fs/iso9660.c | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/grub-core/fs/iso9660.c b/grub-core/fs/iso9660.c
index 7ba5b300b..5ec4433b8 100644
--- a/grub-core/fs/iso9660.c
+++ b/grub-core/fs/iso9660.c
@@ -533,14 +533,20 @@ add_part (struct iterate_dir_ctx *ctx,
 {
   int size = ctx->symlink ? grub_strlen (ctx->symlink) : 0;
   grub_size_t sz;
+  char *new;
 
   if (grub_add (size, len2, &sz) ||
       grub_add (sz, 1, &sz))
     return;
 
-  ctx->symlink = grub_realloc (ctx->symlink, sz);
-  if (! ctx->symlink)
-    return;
+  new = grub_realloc (ctx->symlink, sz);
+  if (!new)
+    {
+      grub_free (ctx->symlink);
+      ctx->symlink = NULL;
+      return;
+    }
+  ctx->symlink = new;
 
   grub_memcpy (ctx->symlink + size, part, len2);
   ctx->symlink[size + len2] = 0;  
@@ -634,7 +640,12 @@ susp_iterate_dir (struct grub_iso9660_susp_entry *entry,
 		   is the length.  Both are part of the `Component
 		   Record'.  */
 		if (ctx->symlink && !ctx->was_continue)
-		  add_part (ctx, "/", 1);
+		  {
+		    add_part (ctx, "/", 1);
+		    if (grub_errno)
+		      return grub_errno;
+		  }
+
 		add_part (ctx, (char *) &entry->data[pos + 2],
 			  entry->data[pos + 1]);
 		ctx->was_continue = (entry->data[pos] & 1);
@@ -653,6 +664,11 @@ susp_iterate_dir (struct grub_iso9660_susp_entry *entry,
 	      add_part (ctx, "/", 1);
 	      break;
 	    }
+
+	  /* Check if grub_realloc() failed in add_part(). */
+	  if (grub_errno)
+	    return grub_errno;
+
 	  /* In pos + 1 the length of the `Component Record' is
 	     stored.  */
 	  pos += entry->data[pos + 1] + 2;

From fcc11dc1e68192d50cfb914314fb5e2f0504c498 Mon Sep 17 00:00:00 2001
From: Daniel Kiper <daniel.kiper@oracle.com>
Date: Tue, 7 Jul 2020 15:36:26 +0200
Subject: font: Do not load more than one NAME section

The GRUB font file can have one NAME section only. Though if somebody
crafts a broken font file with many NAME sections and loads it then the
GRUB leaks memory. So, prevent against that by loading first NAME
section and failing in controlled way on following one.

Reported-by: Chris Coulson <chris.coulson@canonical.com>
Signed-off-by: Daniel Kiper <daniel.kiper@oracle.com>
Reviewed-by: Jan Setje-Eilers <jan.setjeeilers@oracle.com>
---
 grub-core/font/font.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/grub-core/font/font.c b/grub-core/font/font.c
index 5edb477ac..d09bb38d8 100644
--- a/grub-core/font/font.c
+++ b/grub-core/font/font.c
@@ -532,6 +532,12 @@ grub_font_load (const char *filename)
       if (grub_memcmp (section.name, FONT_FORMAT_SECTION_NAMES_FONT_NAME,
 		       sizeof (FONT_FORMAT_SECTION_NAMES_FONT_NAME) - 1) == 0)
 	{
+	  if (font->name != NULL)
+	    {
+	      grub_error (GRUB_ERR_BAD_FONT, "invalid font file: too many NAME sections");
+	      goto fail;
+	    }
+
 	  font->name = read_section_as_string (&section);
 	  if (!font->name)
 	    goto fail;

From e283bb250350e8c2f7edeb344a624c57c26b042f Mon Sep 17 00:00:00 2001
From: Alexey Makhalov <amakhalov@vmware.com>
Date: Wed, 8 Jul 2020 20:41:56 +0000
Subject: gfxmenu: Fix double free in load_image()

self->bitmap should be zeroed after free. Otherwise, there is a chance
to double free (USE_AFTER_FREE) it later in rescale_image().

Fixes: CID 292472

Signed-off-by: Alexey Makhalov <amakhalov@vmware.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/gfxmenu/gui_image.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/grub-core/gfxmenu/gui_image.c b/grub-core/gfxmenu/gui_image.c
index 29784ed2d..6b2e976f1 100644
--- a/grub-core/gfxmenu/gui_image.c
+++ b/grub-core/gfxmenu/gui_image.c
@@ -195,7 +195,10 @@ load_image (grub_gui_image_t self, const char *path)
     return grub_errno;
 
   if (self->bitmap && (self->bitmap != self->raw_bitmap))
-    grub_video_bitmap_destroy (self->bitmap);
+    {
+      grub_video_bitmap_destroy (self->bitmap);
+      self->bitmap = 0;
+    }
   if (self->raw_bitmap)
     grub_video_bitmap_destroy (self->raw_bitmap);
 

From 387219ffbb751afd336ebd71f1a375d9923ba416 Mon Sep 17 00:00:00 2001
From: Alexey Makhalov <amakhalov@vmware.com>
Date: Wed, 8 Jul 2020 21:30:43 +0000
Subject: xnu: Fix double free in grub_xnu_devprop_add_property()

grub_xnu_devprop_add_property() should not free utf8 and utf16 as it get
allocated and freed in the caller.

Minor improvement: do prop fields initialization after memory allocations.

Fixes: CID 292442, CID 292457, CID 292460, CID 292466

Signed-off-by: Alexey Makhalov <amakhalov@vmware.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/loader/i386/xnu.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/grub-core/loader/i386/xnu.c b/grub-core/loader/i386/xnu.c
index b7d176b5d..e9e119259 100644
--- a/grub-core/loader/i386/xnu.c
+++ b/grub-core/loader/i386/xnu.c
@@ -262,20 +262,19 @@ grub_xnu_devprop_add_property (struct grub_xnu_devprop_device_descriptor *dev,
   if (!prop)
     return grub_errno;
 
-  prop->name = utf8;
-  prop->name16 = utf16;
-  prop->name16len = utf16len;
-
-  prop->length = datalen;
-  prop->data = grub_malloc (prop->length);
+  prop->data = grub_malloc (datalen);
   if (!prop->data)
     {
-      grub_free (prop->name);
-      grub_free (prop->name16);
       grub_free (prop);
       return grub_errno;
     }
-  grub_memcpy (prop->data, data, prop->length);
+  grub_memcpy (prop->data, data, datalen);
+
+  prop->name = utf8;
+  prop->name16 = utf16;
+  prop->name16len = utf16len;
+  prop->length = datalen;
+
   grub_list_push (GRUB_AS_LIST_P (&dev->properties),
 		  GRUB_AS_LIST (prop));
   return GRUB_ERR_NONE;

From 8b93dd5ba38c2d726a08b271b14a74e8f960d147 Mon Sep 17 00:00:00 2001
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Date: Thu, 9 Jul 2020 03:05:23 +0000
Subject: lzma: Make sure we don't dereference past array

The two dimensional array p->posSlotEncoder[4][64] is being dereferenced
using the GetLenToPosState() macro which checks if len is less than 5,
and if so subtracts 2 from it. If len = 0, that is 0 - 2 = 4294967294.
Obviously we don't want to dereference that far out so we check if the
position found is greater or equal kNumLenToPosStates (4) and bail out.

N.B.: Upstream LZMA 18.05 and later has this function completely rewritten
without any history.

Fixes: CID 51526

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/lib/LzmaEnc.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/grub-core/lib/LzmaEnc.c b/grub-core/lib/LzmaEnc.c
index f2ec04a8c..753e56a95 100644
--- a/grub-core/lib/LzmaEnc.c
+++ b/grub-core/lib/LzmaEnc.c
@@ -1877,13 +1877,19 @@ static SRes LzmaEnc_CodeOneBlock(CLzmaEnc *p, Bool useLimits, UInt32 maxPackSize
       }
       else
       {
-        UInt32 posSlot;
+        UInt32 posSlot, lenToPosState;
         RangeEnc_EncodeBit(&p->rc, &p->isRep[p->state], 0);
         p->state = kMatchNextStates[p->state];
         LenEnc_Encode2(&p->lenEnc, &p->rc, len - LZMA_MATCH_LEN_MIN, posState, !p->fastMode, p->ProbPrices);
         pos -= LZMA_NUM_REPS;
         GetPosSlot(pos, posSlot);
-        RcTree_Encode(&p->rc, p->posSlotEncoder[GetLenToPosState(len)], kNumPosSlotBits, posSlot);
+        lenToPosState = GetLenToPosState(len);
+        if (lenToPosState >= kNumLenToPosStates)
+        {
+          p->result = SZ_ERROR_DATA;
+          return CheckErrors(p);
+        }
+        RcTree_Encode(&p->rc, p->posSlotEncoder[lenToPosState], kNumPosSlotBits, posSlot);
 
         if (posSlot >= kStartPosModelIndex)
         {

From 2328abbe2caa2129084da04a3e19461ddc571549 Mon Sep 17 00:00:00 2001
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Date: Tue, 7 Jul 2020 15:12:25 -0400
Subject: term: Fix overflow on user inputs

This requires a very weird input from the serial interface but can cause
an overflow in input_buf (keys) overwriting the next variable (npending)
with the user choice:

(pahole output)

struct grub_terminfo_input_state {
        int                        input_buf[6];         /*     0    24 */
        int                        npending;             /*    24     4 */ <- CORRUPT
        ...snip...

The magic string requires causing this is "ESC,O,],0,1,2,q" and we overflow
npending with "q" (aka increase npending to 161). The simplest fix is to
just to disallow overwrites input_buf, which exactly what this patch does.

Fixes: CID 292449

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/term/terminfo.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/grub-core/term/terminfo.c b/grub-core/term/terminfo.c
index 63892ad42..aa3a108ca 100644
--- a/grub-core/term/terminfo.c
+++ b/grub-core/term/terminfo.c
@@ -398,7 +398,7 @@ grub_terminfo_getwh (struct grub_term_output *term)
 }
 
 static void
-grub_terminfo_readkey (struct grub_term_input *term, int *keys, int *len,
+grub_terminfo_readkey (struct grub_term_input *term, int *keys, int *len, int max_len,
 		       int (*readkey) (struct grub_term_input *term))
 {
   int c;
@@ -414,6 +414,9 @@ grub_terminfo_readkey (struct grub_term_input *term, int *keys, int *len,
     if (c == -1)						\
       return;							\
 								\
+    if (*len >= max_len)                                       \
+      return;                                                   \
+                                                                \
     keys[*len] = c;						\
     (*len)++;							\
   }
@@ -602,8 +605,8 @@ grub_terminfo_getkey (struct grub_term_input *termi)
       return ret;
     }
 
-  grub_terminfo_readkey (termi, data->input_buf,
-			 &data->npending, data->readkey);
+  grub_terminfo_readkey (termi, data->input_buf, &data->npending,
+			 GRUB_TERMINFO_READKEY_MAX_LEN, data->readkey);
 
 #if defined(__powerpc__) && defined(GRUB_MACHINE_IEEE1275)
   if (data->npending == 1 && data->input_buf[0] == GRUB_TERM_ESC

From ba1d97845644290f03754432bcb6bbd6fefe7003 Mon Sep 17 00:00:00 2001
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Date: Tue, 7 Jul 2020 22:02:31 -0400
Subject: udf: Fix memory leak

Fixes: CID 73796

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Reviewed-by: Jan Setje-Eilers <jan.setjeeilers@oracle.com>
---
 grub-core/fs/udf.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/grub-core/fs/udf.c b/grub-core/fs/udf.c
index 21ac7f446..2ac5c1d00 100644
--- a/grub-core/fs/udf.c
+++ b/grub-core/fs/udf.c
@@ -965,8 +965,10 @@ grub_udf_iterate_dir (grub_fshelp_node_t dir,
 	    return 0;
 
           if (grub_udf_read_icb (dir->data, &dirent.icb, child))
-	    return 0;
-
+	    {
+	      grub_free (child);
+	      return 0;
+	    }
           if (dirent.characteristics & GRUB_UDF_FID_CHAR_PARENT)
 	    {
 	      /* This is the parent directory.  */
@@ -988,11 +990,18 @@ grub_udf_iterate_dir (grub_fshelp_node_t dir,
 				       dirent.file_ident_length,
 				       (char *) raw))
 		  != dirent.file_ident_length)
-		return 0;
+		{
+		  grub_free (child);
+		  return 0;
+		}
 
 	      filename = read_string (raw, dirent.file_ident_length, 0);
 	      if (!filename)
-		grub_print_error ();
+		{
+		  /* As the hook won't get called. */
+		  grub_free (child);
+		  grub_print_error ();
+		}
 
 	      if (filename && hook (filename, type, child, hook_data))
 		{

From 3b39c2023f3aa242b008385939a7394e5946e94b Mon Sep 17 00:00:00 2001
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Date: Fri, 26 Jun 2020 10:51:43 -0400
Subject: multiboot2: Fix memory leak if
 grub_create_loader_cmdline() fails

Fixes: CID 292468

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/loader/multiboot_mbi2.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/grub-core/loader/multiboot_mbi2.c b/grub-core/loader/multiboot_mbi2.c
index 53da78615..0efc66062 100644
--- a/grub-core/loader/multiboot_mbi2.c
+++ b/grub-core/loader/multiboot_mbi2.c
@@ -1070,7 +1070,11 @@ grub_multiboot2_add_module (grub_addr_t start, grub_size_t size,
   err = grub_create_loader_cmdline (argc, argv, newmod->cmdline,
 				    newmod->cmdline_size, GRUB_VERIFY_MODULE_CMDLINE);
   if (err)
-    return err;
+    {
+      grub_free (newmod->cmdline);
+      grub_free (newmod);
+      return err;
+    }
 
   if (modules_last)
     modules_last->next = newmod;

From 7726da0d972c3996b3ced02586204334eb03d472 Mon Sep 17 00:00:00 2001
From: Alexey Makhalov <amakhalov@vmware.com>
Date: Thu, 9 Jul 2020 08:10:40 +0000
Subject: tftp: Do not use priority queue

There is not need to reassemble the order of blocks. Per RFC 1350,
server must wait for the ACK, before sending next block. Data packets
can be served immediately without putting them to priority queue.

Logic to handle incoming packet is this:
  - if packet block id equal to expected block id, then
    process the packet,
  - if packet block id is less than expected - this is retransmit
    of old packet, then ACK it and drop the packet,
  - if packet block id is more than expected - that shouldn't
    happen, just drop the packet.

It makes the tftp receive path code simpler, smaller and faster.
As a benefit, this change fixes CID# 73624 and CID# 96690, caused
by following while loop:

  while (cmp_block (grub_be_to_cpu16 (tftph->u.data.block), data->block + 1) == 0)

where tftph pointer is not moving from one iteration to another, causing
to serve same packet again. Luckily, double serving didn't happen due to
data->block++ during the first iteration.

Fixes: CID 73624, CID 96690

Signed-off-by: Alexey Makhalov <amakhalov@vmware.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/net/tftp.c | 168 ++++++++++++++-----------------------------
 1 file changed, 53 insertions(+), 115 deletions(-)

diff --git a/grub-core/net/tftp.c b/grub-core/net/tftp.c
index a0817a075..84229d03d 100644
--- a/grub-core/net/tftp.c
+++ b/grub-core/net/tftp.c
@@ -25,7 +25,6 @@
 #include <grub/mm.h>
 #include <grub/dl.h>
 #include <grub/file.h>
-#include <grub/priority_queue.h>
 #include <grub/i18n.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
@@ -106,31 +105,8 @@ typedef struct tftp_data
   int have_oack;
   struct grub_error_saved save_err;
   grub_net_udp_socket_t sock;
-  grub_priority_queue_t pq;
 } *tftp_data_t;
 
-static int
-cmp_block (grub_uint16_t a, grub_uint16_t b)
-{
-  grub_int16_t i = (grub_int16_t) (a - b);
-  if (i > 0)
-    return +1;
-  if (i < 0)
-    return -1;
-  return 0;
-}
-
-static int
-cmp (const void *a__, const void *b__)
-{
-  struct grub_net_buff *a_ = *(struct grub_net_buff **) a__;
-  struct grub_net_buff *b_ = *(struct grub_net_buff **) b__;
-  struct tftphdr *a = (struct tftphdr *) a_->data;
-  struct tftphdr *b = (struct tftphdr *) b_->data;
-  /* We want the first elements to be on top.  */
-  return -cmp_block (grub_be_to_cpu16 (a->u.data.block), grub_be_to_cpu16 (b->u.data.block));
-}
-
 static grub_err_t
 ack (tftp_data_t data, grub_uint64_t block)
 {
@@ -207,73 +183,60 @@ tftp_receive (grub_net_udp_socket_t sock __attribute__ ((unused)),
 	  return GRUB_ERR_NONE;
 	}
 
-      err = grub_priority_queue_push (data->pq, &nb);
-      if (err)
-	return err;
-
-      {
-	struct grub_net_buff **nb_top_p, *nb_top;
-	while (1)
-	  {
-	    nb_top_p = grub_priority_queue_top (data->pq);
-	    if (!nb_top_p)
-	      return GRUB_ERR_NONE;
-	    nb_top = *nb_top_p;
-	    tftph = (struct tftphdr *) nb_top->data;
-	    if (cmp_block (grub_be_to_cpu16 (tftph->u.data.block), data->block + 1) >= 0)
-	      break;
-	    ack (data, grub_be_to_cpu16 (tftph->u.data.block));
-	    grub_netbuff_free (nb_top);
-	    grub_priority_queue_pop (data->pq);
-	  }
-	while (cmp_block (grub_be_to_cpu16 (tftph->u.data.block), data->block + 1) == 0)
-	  {
-	    unsigned size;
-
-	    grub_priority_queue_pop (data->pq);
-
-	    if (file->device->net->packs.count < 50)
+      /* Ack old/retransmitted block. */
+      if (grub_be_to_cpu16 (tftph->u.data.block) < data->block + 1)
+	ack (data, grub_be_to_cpu16 (tftph->u.data.block));
+      /* Ignore unexpected block. */
+      else if (grub_be_to_cpu16 (tftph->u.data.block) > data->block + 1)
+	grub_dprintf ("tftp", "TFTP unexpected block # %d\n", tftph->u.data.block);
+      else
+	{
+	  unsigned size;
+
+	  if (file->device->net->packs.count < 50)
+	    {
 	      err = ack (data, data->block + 1);
-	    else
-	      {
-		file->device->net->stall = 1;
-		err = 0;
-	      }
-	    if (err)
-	      return err;
-
-	    err = grub_netbuff_pull (nb_top, sizeof (tftph->opcode) +
-				     sizeof (tftph->u.data.block));
-	    if (err)
-	      return err;
-	    size = nb_top->tail - nb_top->data;
-
-	    data->block++;
-	    if (size < data->block_size)
-	      {
-		if (data->ack_sent < data->block)
-		  ack (data, data->block);
-		file->device->net->eof = 1;
-		file->device->net->stall = 1;
-		grub_net_udp_close (data->sock);
-		data->sock = NULL;
-	      }
-	    /* Prevent garbage in broken cards. Is it still necessary
-	       given that IP implementation has been fixed?
-	     */
-	    if (size > data->block_size)
-	      {
-		err = grub_netbuff_unput (nb_top, size - data->block_size);
-		if (err)
-		  return err;
-	      }
-	    /* If there is data, puts packet in socket list. */
-	    if ((nb_top->tail - nb_top->data) > 0)
-	      grub_net_put_packet (&file->device->net->packs, nb_top);
-	    else
-	      grub_netbuff_free (nb_top);
-	  }
-      }
+	      if (err)
+		return err;
+	    }
+	  else
+	    file->device->net->stall = 1;
+
+	  err = grub_netbuff_pull (nb, sizeof (tftph->opcode) +
+				   sizeof (tftph->u.data.block));
+	  if (err)
+	    return err;
+	  size = nb->tail - nb->data;
+
+	  data->block++;
+	  if (size < data->block_size)
+	    {
+	      if (data->ack_sent < data->block)
+		ack (data, data->block);
+	      file->device->net->eof = 1;
+	      file->device->net->stall = 1;
+	      grub_net_udp_close (data->sock);
+	      data->sock = NULL;
+	    }
+	  /*
+	   * Prevent garbage in broken cards. Is it still necessary
+	   * given that IP implementation has been fixed?
+	   */
+	  if (size > data->block_size)
+	    {
+	      err = grub_netbuff_unput (nb, size - data->block_size);
+	      if (err)
+		return err;
+	    }
+	  /* If there is data, puts packet in socket list. */
+	  if ((nb->tail - nb->data) > 0)
+	    {
+	      grub_net_put_packet (&file->device->net->packs, nb);
+	      /* Do not free nb. */
+	      return GRUB_ERR_NONE;
+	    }
+	}
+      grub_netbuff_free (nb);
       return GRUB_ERR_NONE;
     case TFTP_ERROR:
       data->have_oack = 1;
@@ -287,19 +250,6 @@ tftp_receive (grub_net_udp_socket_t sock __attribute__ ((unused)),
     }
 }
 
-static void
-destroy_pq (tftp_data_t data)
-{
-  struct grub_net_buff **nb_p;
-  while ((nb_p = grub_priority_queue_top (data->pq)))
-    {
-      grub_netbuff_free (*nb_p);
-      grub_priority_queue_pop (data->pq);
-    }
-
-  grub_priority_queue_destroy (data->pq);
-}
-
 static grub_err_t
 tftp_open (struct grub_file *file, const char *filename)
 {
@@ -322,17 +322,9 @@ tftp_open (struct grub_file *file, const char *filename)
   file->not_easily_seekable = 1;
   file->data = data;
 
-  data->pq = grub_priority_queue_new (sizeof (struct grub_net_buff *), cmp);
-  if (!data->pq)
-    {
-      grub_free (data);
-      return grub_errno;
-    }
-
   err = grub_net_resolve_address (file->device->net->server, &addr);
   if (err)
     {
-      destroy_pq (data);
       grub_free (data);
       return err;
     }
@@ -396,7 +338,6 @@ tftp_open (struct grub_file *file, const char *filename)
 				  file);
   if (!data->sock)
     {
-      destroy_pq (data);
       grub_free (data);
       return grub_errno;
     }
@@ -410,7 +351,6 @@ tftp_open (struct grub_file *file, const char *filename)
       if (err)
 	{
 	  grub_net_udp_close (data->sock);
-	  destroy_pq (data);
 	  grub_free (data);
 	  return err;
 	}
@@ -427,7 +367,6 @@ tftp_open (struct grub_file *file, const char *filename)
   if (grub_errno)
     {
       grub_net_udp_close (data->sock);
-      destroy_pq (data);
       grub_free (data);
       return grub_errno;
     }
@@ -470,7 +409,6 @@ tftp_close (struct grub_file *file)
 	grub_print_error ();
       grub_net_udp_close (data->sock);
     }
-  destroy_pq (data);
   grub_free (data);
   return GRUB_ERR_NONE;
 }

From f1e2fd65877424ee8d8d2bdd78ce28b420dee4d8 Mon Sep 17 00:00:00 2001
From: Alexey Makhalov <amakhalov@vmware.com>
Date: Wed, 15 Jul 2020 06:42:37 +0000
Subject: relocator: Protect grub_relocator_alloc_chunk_addr()
 input args against integer underflow/overflow

Use arithmetic macros from safemath.h to accomplish it. In this commit,
I didn't want to be too paranoid to check every possible math equation
for overflow/underflow. Only obvious places (with non zero chance of
overflow/underflow) were refactored.

Signed-off-by: Alexey Makhalov <amakhalov@vmware.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/loader/i386/linux.c    |  9 +++++++--
 grub-core/loader/i386/pc/linux.c |  9 +++++++--
 grub-core/loader/i386/xen.c      | 12 ++++++++++--
 grub-core/loader/xnu.c           | 11 +++++++----
 4 files changed, 31 insertions(+), 10 deletions(-)

diff --git a/grub-core/loader/i386/linux.c b/grub-core/loader/i386/linux.c
index 2eab9bb10..58d76fc0a 100644
--- a/grub-core/loader/i386/linux.c
+++ b/grub-core/loader/i386/linux.c
@@ -36,6 +36,7 @@
 #include <grub/lib/cmdline.h>
 #include <grub/linux.h>
 #include <grub/machine/kernel.h>
+#include <grub/safemath.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
@@ -549,9 +550,13 @@ grub_linux_boot (void)
 
   {
     grub_relocator_chunk_t ch;
+    grub_size_t sz;
+
+    if (grub_add (ctx.real_size, efi_mmap_size, &sz))
+      return GRUB_ERR_OUT_OF_RANGE;
+
     err = grub_relocator_alloc_chunk_addr (relocator, &ch,
-					   ctx.real_mode_target,
-					   (ctx.real_size + efi_mmap_size));
+					   ctx.real_mode_target, sz);
     if (err)
      return err;
     real_mode_mem = get_virtual_current_address (ch);
diff --git a/grub-core/loader/i386/pc/linux.c b/grub-core/loader/i386/pc/linux.c
index 47ea2945e..31f09922b 100644
--- a/grub-core/loader/i386/pc/linux.c
+++ b/grub-core/loader/i386/pc/linux.c
@@ -35,6 +35,7 @@
 #include <grub/i386/floppy.h>
 #include <grub/lib/cmdline.h>
 #include <grub/linux.h>
+#include <grub/safemath.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
@@ -218,8 +219,12 @@ grub_cmd_linux (grub_command_t cmd __attribute__ ((unused)),
     setup_sects = GRUB_LINUX_DEFAULT_SETUP_SECTS;
 
   real_size = setup_sects << GRUB_DISK_SECTOR_BITS;
-  grub_linux16_prot_size = grub_file_size (file)
-    - real_size - GRUB_DISK_SECTOR_SIZE;
+  if (grub_sub (grub_file_size (file), real_size, &grub_linux16_prot_size) ||
+      grub_sub (grub_linux16_prot_size, GRUB_DISK_SECTOR_SIZE, &grub_linux16_prot_size))
+    {
+      grub_error (GRUB_ERR_OUT_OF_RANGE, N_("overflow is detected"));
+      goto fail;
+    }
 
   if (! grub_linux_is_bzimage
       && GRUB_LINUX_ZIMAGE_ADDR + grub_linux16_prot_size
diff --git a/grub-core/loader/i386/xen.c b/grub-core/loader/i386/xen.c
index 8f662c8ac..cd24874ca 100644
--- a/grub-core/loader/i386/xen.c
+++ b/grub-core/loader/i386/xen.c
@@ -41,6 +41,7 @@
 #include <grub/linux.h>
 #include <grub/i386/memory.h>
 #include <grub/verify.h>
+#include <grub/safemath.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
@@ -636,6 +637,7 @@ grub_cmd_xen (grub_command_t cmd __attribute__ ((unused)),
   grub_relocator_chunk_t ch;
   grub_addr_t kern_start;
   grub_addr_t kern_end;
+  grub_size_t sz;
 
   if (argc == 0)
     return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
@@ -703,8 +705,14 @@ grub_cmd_xen (grub_command_t cmd __attribute__ ((unused)),
 
   xen_state.max_addr = ALIGN_UP (kern_end, PAGE_SIZE);
 
-  err = grub_relocator_alloc_chunk_addr (xen_state.relocator, &ch, kern_start,
-					 kern_end - kern_start);
+
+  if (grub_sub (kern_end, kern_start, &sz))
+    {
+      err = GRUB_ERR_OUT_OF_RANGE;
+      goto fail;
+    }
+
+  err = grub_relocator_alloc_chunk_addr (xen_state.relocator, &ch, kern_start, sz);
   if (err)
     goto fail;
   kern_chunk_src = get_virtual_current_address (ch);
diff --git a/grub-core/loader/xnu.c b/grub-core/loader/xnu.c
index 77d7060e1..9ae4ceb35 100644
--- a/grub-core/loader/xnu.c
+++ b/grub-core/loader/xnu.c
@@ -34,6 +34,7 @@
 #include <grub/env.h>
 #include <grub/i18n.h>
 #include <grub/verify.h>
+#include <grub/safemath.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
@@ -59,15 +60,17 @@ grub_xnu_heap_malloc (int size, void **src, grub_addr_t *target)
 {
   grub_err_t err;
   grub_relocator_chunk_t ch;
+  grub_addr_t tgt;
+
+  if (grub_add (grub_xnu_heap_target_start, grub_xnu_heap_size, &tgt))
+    return GRUB_ERR_OUT_OF_RANGE;
   
-  err = grub_relocator_alloc_chunk_addr (grub_xnu_relocator, &ch,
-					 grub_xnu_heap_target_start
-					 + grub_xnu_heap_size, size);
+  err = grub_relocator_alloc_chunk_addr (grub_xnu_relocator, &ch, tgt, size);
   if (err)
     return err;
 
   *src = get_virtual_current_address (ch);
-  *target = grub_xnu_heap_target_start + grub_xnu_heap_size;
+  *target = tgt;
   grub_xnu_heap_size += size;
   grub_dprintf ("xnu", "val=%p\n", *src);
   return GRUB_ERR_NONE;

From e39786ab462b1e4770fb35c736927286381ec47d Mon Sep 17 00:00:00 2001
From: Alexey Makhalov <amakhalov@vmware.com>
Date: Wed, 8 Jul 2020 01:44:38 +0000
Subject: relocator: Protect grub_relocator_alloc_chunk_align()
 max_addr against integer underflow

This commit introduces integer underflow mitigation in max_addr calculation
in grub_relocator_alloc_chunk_align() invocation.

It consists of 2 fixes:
  1. Introduced grub_relocator_alloc_chunk_align_safe() wrapper function to perform
     sanity check for min/max and size values, and to make safe invocation of
     grub_relocator_alloc_chunk_align() with validated max_addr value. Replace all
     invocations such as grub_relocator_alloc_chunk_align(..., min_addr, max_addr - size, size, ...)
     by grub_relocator_alloc_chunk_align_safe(..., min_addr, max_addr, size, ...).
  2. Introduced UP_TO_TOP32(s) macro for the cases where max_addr is 32-bit top
     address (0xffffffff - size + 1) or similar.

Signed-off-by: Alexey Makhalov <amakhalov@vmware.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/lib/i386/relocator.c        | 28 ++++++++++----------------
 grub-core/lib/mips/relocator.c        |  6 ++----
 grub-core/lib/powerpc/relocator.c     |  6 ++----
 grub-core/lib/x86_64/efi/relocator.c  |  7 +++----
 grub-core/loader/i386/linux.c         |  5 ++---
 grub-core/loader/i386/multiboot_mbi.c |  7 +++----
 grub-core/loader/i386/pc/linux.c      |  6 ++----
 grub-core/loader/mips/linux.c         |  9 +++------
 grub-core/loader/multiboot.c          |  2 +-
 grub-core/loader/multiboot_elfxx.c    | 10 ++++-----
 grub-core/loader/multiboot_mbi2.c     | 10 ++++-----
 grub-core/loader/xnu_resume.c         |  2 +-
 include/grub/relocator.h              | 29 +++++++++++++++++++++++++++
 13 files changed, 69 insertions(+), 58 deletions(-)

diff --git a/grub-core/lib/i386/relocator.c b/grub-core/lib/i386/relocator.c
index 71dd4f0ab..34cbe834f 100644
--- a/grub-core/lib/i386/relocator.c
+++ b/grub-core/lib/i386/relocator.c
@@ -83,11 +83,10 @@ grub_relocator32_boot (struct grub_relocator *rel,
   /* Specific memory range due to Global Descriptor Table for use by payload
      that we will store in returned chunk.  The address range and preference
      are based on "THE LINUX/x86 BOOT PROTOCOL" specification.  */
-  err = grub_relocator_alloc_chunk_align (rel, &ch, 0x1000,
-					  0x9a000 - RELOCATOR_SIZEOF (32),
-					  RELOCATOR_SIZEOF (32), 16,
-					  GRUB_RELOCATOR_PREFERENCE_LOW,
-					  avoid_efi_bootservices);
+  err = grub_relocator_alloc_chunk_align_safe (rel, &ch, 0x1000, 0x9a000,
+					       RELOCATOR_SIZEOF (32), 16,
+					       GRUB_RELOCATOR_PREFERENCE_LOW,
+					       avoid_efi_bootservices);
   if (err)
     return err;
 
@@ -125,13 +124,10 @@ grub_relocator16_boot (struct grub_relocator *rel,
   grub_relocator_chunk_t ch;
 
   /* Put it higher than the byte it checks for A20 check.  */
-  err = grub_relocator_alloc_chunk_align (rel, &ch, 0x8010,
-					  0xa0000 - RELOCATOR_SIZEOF (16)
-					  - GRUB_RELOCATOR16_STACK_SIZE,
-					  RELOCATOR_SIZEOF (16)
-					  + GRUB_RELOCATOR16_STACK_SIZE, 16,
-					  GRUB_RELOCATOR_PREFERENCE_NONE,
-					  0);
+  err = grub_relocator_alloc_chunk_align_safe (rel, &ch, 0x8010, 0xa0000,
+					       RELOCATOR_SIZEOF (16) +
+					       GRUB_RELOCATOR16_STACK_SIZE, 16,
+					       GRUB_RELOCATOR_PREFERENCE_NONE, 0);
   if (err)
     return err;
 
@@ -183,11 +179,9 @@ grub_relocator64_boot (struct grub_relocator *rel,
   void *relst;
   grub_relocator_chunk_t ch;
 
-  err = grub_relocator_alloc_chunk_align (rel, &ch, min_addr,
-					  max_addr - RELOCATOR_SIZEOF (64),
-					  RELOCATOR_SIZEOF (64), 16,
-					  GRUB_RELOCATOR_PREFERENCE_NONE,
-					  0);
+  err = grub_relocator_alloc_chunk_align_safe (rel, &ch, min_addr, max_addr,
+					       RELOCATOR_SIZEOF (64), 16,
+					       GRUB_RELOCATOR_PREFERENCE_NONE, 0);
   if (err)
     return err;
 
diff --git a/grub-core/lib/mips/relocator.c b/grub-core/lib/mips/relocator.c
index 9d5f49cb9..743b213e6 100644
--- a/grub-core/lib/mips/relocator.c
+++ b/grub-core/lib/mips/relocator.c
@@ -120,10 +120,8 @@ grub_relocator32_boot (struct grub_relocator *rel,
   unsigned i;
   grub_addr_t vtarget;
 
-  err = grub_relocator_alloc_chunk_align (rel, &ch, 0,
-					  (0xffffffff - stateset_size)
-					  + 1, stateset_size,
-					  sizeof (grub_uint32_t),
+  err = grub_relocator_alloc_chunk_align (rel, &ch, 0, UP_TO_TOP32 (stateset_size),
+					  stateset_size, sizeof (grub_uint32_t),
 					  GRUB_RELOCATOR_PREFERENCE_NONE, 0);
   if (err)
     return err;
diff --git a/grub-core/lib/powerpc/relocator.c b/grub-core/lib/powerpc/relocator.c
index bdf2b111b..8ffb8b686 100644
--- a/grub-core/lib/powerpc/relocator.c
+++ b/grub-core/lib/powerpc/relocator.c
@@ -115,10 +115,8 @@ grub_relocator32_boot (struct grub_relocator *rel,
   unsigned i;
   grub_relocator_chunk_t ch;
 
-  err = grub_relocator_alloc_chunk_align (rel, &ch, 0,
-					  (0xffffffff - stateset_size)
-					  + 1, stateset_size,
-					  sizeof (grub_uint32_t),
+  err = grub_relocator_alloc_chunk_align (rel, &ch, 0, UP_TO_TOP32 (stateset_size),
+					  stateset_size, sizeof (grub_uint32_t),
 					  GRUB_RELOCATOR_PREFERENCE_NONE, 0);
   if (err)
     return err;
diff --git a/grub-core/lib/x86_64/efi/relocator.c b/grub-core/lib/x86_64/efi/relocator.c
index 3caef7a40..7d200a125 100644
--- a/grub-core/lib/x86_64/efi/relocator.c
+++ b/grub-core/lib/x86_64/efi/relocator.c
@@ -50,10 +50,9 @@ grub_relocator64_efi_boot (struct grub_relocator *rel,
    * 64-bit relocator code may live above 4 GiB quite well.
    * However, I do not want ask for problems. Just in case.
    */
-  err = grub_relocator_alloc_chunk_align (rel, &ch, 0,
-					  0x100000000 - RELOCATOR_SIZEOF (64_efi),
-					  RELOCATOR_SIZEOF (64_efi), 16,
-					  GRUB_RELOCATOR_PREFERENCE_NONE, 1);
+  err = grub_relocator_alloc_chunk_align_safe (rel, &ch, 0, 0x100000000,
+					       RELOCATOR_SIZEOF (64_efi), 16,
+					       GRUB_RELOCATOR_PREFERENCE_NONE, 1);
   if (err)
     return err;
 
diff --git a/grub-core/loader/i386/linux.c b/grub-core/loader/i386/linux.c
index 58d76fc0a..c98fbbb37 100644
--- a/grub-core/loader/i386/linux.c
+++ b/grub-core/loader/i386/linux.c
@@ -183,9 +183,8 @@ allocate_pages (grub_size_t prot_size, grub_size_t *align,
 	for (; err && *align + 1 > min_align; (*align)--)
 	  {
 	    grub_errno = GRUB_ERR_NONE;
-	    err = grub_relocator_alloc_chunk_align (relocator, &ch,
-						    0x1000000,
-						    0xffffffff & ~prot_size,
+	    err = grub_relocator_alloc_chunk_align (relocator, &ch, 0x1000000,
+						    UP_TO_TOP32 (prot_size),
 						    prot_size, 1 << *align,
 						    GRUB_RELOCATOR_PREFERENCE_LOW,
 						    1);
diff --git a/grub-core/loader/i386/multiboot_mbi.c b/grub-core/loader/i386/multiboot_mbi.c
index ad3cc292f..a67d9d0a8 100644
--- a/grub-core/loader/i386/multiboot_mbi.c
+++ b/grub-core/loader/i386/multiboot_mbi.c
@@ -466,10 +466,9 @@ grub_multiboot_make_mbi (grub_uint32_t *target)
 
   bufsize = grub_multiboot_get_mbi_size ();
 
-  err = grub_relocator_alloc_chunk_align (grub_multiboot_relocator, &ch,
-					  0x10000, 0xa0000 - bufsize,
-					  bufsize, 4,
-					  GRUB_RELOCATOR_PREFERENCE_NONE, 0);
+  err = grub_relocator_alloc_chunk_align_safe (grub_multiboot_relocator, &ch,
+					       0x10000, 0xa0000, bufsize, 4,
+					       GRUB_RELOCATOR_PREFERENCE_NONE, 0);
   if (err)
     return err;
   ptrorig = get_virtual_current_address (ch);
diff --git a/grub-core/loader/i386/pc/linux.c b/grub-core/loader/i386/pc/linux.c
index 31f09922b..5fed5ffdf 100644
--- a/grub-core/loader/i386/pc/linux.c
+++ b/grub-core/loader/i386/pc/linux.c
@@ -453,10 +453,8 @@ grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
 
   {
     grub_relocator_chunk_t ch;
-    err = grub_relocator_alloc_chunk_align (relocator, &ch,
-					    addr_min, addr_max - size,
-					    size, 0x1000,
-					    GRUB_RELOCATOR_PREFERENCE_HIGH, 0);
+    err = grub_relocator_alloc_chunk_align_safe (relocator, &ch, addr_min, addr_max, size,
+						 0x1000, GRUB_RELOCATOR_PREFERENCE_HIGH, 0);
     if (err)
       return err;
     initrd_chunk = get_virtual_current_address (ch);
diff --git a/grub-core/loader/mips/linux.c b/grub-core/loader/mips/linux.c
index 7b723bf18..e4ed95921 100644
--- a/grub-core/loader/mips/linux.c
+++ b/grub-core/loader/mips/linux.c
@@ -442,12 +442,9 @@ grub_cmd_initrd (grub_command_t cmd __attribute__ ((unused)),
   {
     grub_relocator_chunk_t ch;
 
-    err = grub_relocator_alloc_chunk_align (relocator, &ch,
-					    (target_addr & 0x1fffffff)
-					    + linux_size + 0x10000,
-					    (0x10000000 - size),
-					    size, 0x10000,
-					    GRUB_RELOCATOR_PREFERENCE_NONE, 0);
+    err = grub_relocator_alloc_chunk_align_safe (relocator, &ch, (target_addr & 0x1fffffff) +
+						 linux_size + 0x10000, 0x10000000, size,
+						 0x10000, GRUB_RELOCATOR_PREFERENCE_NONE, 0);
 
     if (err)
       goto fail;
diff --git a/grub-core/loader/multiboot.c b/grub-core/loader/multiboot.c
index 4a98d7082..facb13f3d 100644
--- a/grub-core/loader/multiboot.c
+++ b/grub-core/loader/multiboot.c
@@ -403,7 +403,7 @@ grub_cmd_module (grub_command_t cmd __attribute__ ((unused)),
   {
     grub_relocator_chunk_t ch;
     err = grub_relocator_alloc_chunk_align (GRUB_MULTIBOOT (relocator), &ch,
-					    lowest_addr, (0xffffffff - size) + 1,
+					    lowest_addr, UP_TO_TOP32 (size),
 					    size, MULTIBOOT_MOD_ALIGN,
 					    GRUB_RELOCATOR_PREFERENCE_NONE, 1);
     if (err)
diff --git a/grub-core/loader/multiboot_elfxx.c b/grub-core/loader/multiboot_elfxx.c
index cc6853692..f2318e0d1 100644
--- a/grub-core/loader/multiboot_elfxx.c
+++ b/grub-core/loader/multiboot_elfxx.c
@@ -109,10 +109,10 @@ CONCAT(grub_multiboot_load_elf, XX) (mbi_load_data_t *mld)
       if (load_size > mld->max_addr || mld->min_addr > mld->max_addr - load_size)
 	return grub_error (GRUB_ERR_BAD_OS, "invalid min/max address and/or load size");
 
-      err = grub_relocator_alloc_chunk_align (GRUB_MULTIBOOT (relocator), &ch,
-					      mld->min_addr, mld->max_addr - load_size,
-					      load_size, mld->align ? mld->align : 1,
-					      mld->preference, mld->avoid_efi_boot_services);
+      err = grub_relocator_alloc_chunk_align_safe (GRUB_MULTIBOOT (relocator), &ch,
+						   mld->min_addr, mld->max_addr,
+						   load_size, mld->align ? mld->align : 1,
+						   mld->preference, mld->avoid_efi_boot_services);
 
       if (err)
         {
@@ -256,7 +256,7 @@ CONCAT(grub_multiboot_load_elf, XX) (mbi_load_data_t *mld)
 	    continue;
 
 	  err = grub_relocator_alloc_chunk_align (GRUB_MULTIBOOT (relocator), &ch, 0,
-						  (0xffffffff - sh->sh_size) + 1,
+						  UP_TO_TOP32 (sh->sh_size),
 						  sh->sh_size, sh->sh_addralign,
 						  GRUB_RELOCATOR_PREFERENCE_NONE,
 						  mld->avoid_efi_boot_services);
diff --git a/grub-core/loader/multiboot_mbi2.c b/grub-core/loader/multiboot_mbi2.c
index 0efc66062..03967839c 100644
--- a/grub-core/loader/multiboot_mbi2.c
+++ b/grub-core/loader/multiboot_mbi2.c
@@ -295,10 +295,10 @@ grub_multiboot2_load (grub_file_t file, const char *filename)
 	      return grub_error (GRUB_ERR_BAD_OS, "invalid min/max address and/or load size");
 	    }
 
-	  err = grub_relocator_alloc_chunk_align (grub_multiboot2_relocator, &ch,
-						  mld.min_addr, mld.max_addr - code_size,
-						  code_size, mld.align ? mld.align : 1,
-						  mld.preference, keep_bs);
+	  err = grub_relocator_alloc_chunk_align_safe (grub_multiboot2_relocator, &ch,
+						       mld.min_addr, mld.max_addr,
+						       code_size, mld.align ? mld.align : 1,
+						       mld.preference, keep_bs);
 	}
       else
 	err = grub_relocator_alloc_chunk_addr (grub_multiboot2_relocator,
@@ -708,7 +708,7 @@ grub_multiboot2_make_mbi (grub_uint32_t *target)
   COMPILE_TIME_ASSERT (MULTIBOOT_TAG_ALIGN % sizeof (grub_properly_aligned_t) == 0);
 
   err = grub_relocator_alloc_chunk_align (grub_multiboot2_relocator, &ch,
-					  0, 0xffffffff - bufsize,
+					  0, UP_TO_TOP32 (bufsize),
 					  bufsize, MULTIBOOT_TAG_ALIGN,
 					  GRUB_RELOCATOR_PREFERENCE_NONE, 1);
   if (err)
diff --git a/grub-core/loader/xnu_resume.c b/grub-core/loader/xnu_resume.c
index 8089804d4..d648ef0cd 100644
--- a/grub-core/loader/xnu_resume.c
+++ b/grub-core/loader/xnu_resume.c
@@ -129,7 +129,7 @@ grub_xnu_resume (char *imagename)
   {
     grub_relocator_chunk_t ch;
     err = grub_relocator_alloc_chunk_align (grub_xnu_relocator, &ch, 0,
-					    (0xffffffff - hibhead.image_size) + 1,
+					    UP_TO_TOP32 (hibhead.image_size),
 					    hibhead.image_size,
 					    GRUB_XNU_PAGESIZE,
 					    GRUB_RELOCATOR_PREFERENCE_NONE, 0);
diff --git a/include/grub/relocator.h b/include/grub/relocator.h
index 24d8672d2..1b3bdd92a 100644
--- a/include/grub/relocator.h
+++ b/include/grub/relocator.h
@@ -49,6 +49,35 @@ grub_relocator_alloc_chunk_align (struct grub_relocator *rel,
 				  int preference,
 				  int avoid_efi_boot_services);
 
+/*
+ * Wrapper for grub_relocator_alloc_chunk_align() with purpose of
+ * protecting against integer underflow.
+ *
+ * Compare to its callee, max_addr has different meaning here.
+ * It covers entire chunk and not just start address of the chunk.
+ */
+static inline grub_err_t
+grub_relocator_alloc_chunk_align_safe (struct grub_relocator *rel,
+				       grub_relocator_chunk_t *out,
+				       grub_phys_addr_t min_addr,
+				       grub_phys_addr_t max_addr,
+				       grub_size_t size, grub_size_t align,
+				       int preference,
+				       int avoid_efi_boot_services)
+{
+  /* Sanity check and ensure following equation (max_addr - size) is safe. */
+  if (max_addr < size || (max_addr - size) < min_addr)
+    return GRUB_ERR_OUT_OF_RANGE;
+
+  return grub_relocator_alloc_chunk_align (rel, out, min_addr,
+					   max_addr - size,
+					   size, align, preference,
+					   avoid_efi_boot_services);
+}
+
+/* Top 32-bit address minus s bytes and plus 1 byte. */
+#define UP_TO_TOP32(s)	((~(s) & 0xffffffff) + 1)
+
 #define GRUB_RELOCATOR_PREFERENCE_NONE 0
 #define GRUB_RELOCATOR_PREFERENCE_LOW 1
 #define GRUB_RELOCATOR_PREFERENCE_HIGH 2

From 7855b7e78de5f257fa686ec569bda27472c4f5da Mon Sep 17 00:00:00 2001
From: Chris Coulson <chris.coulson@canonical.com>
Date: Fri, 10 Jul 2020 11:21:14 +0100
Subject: script: Remove unused fields from grub_script_function
 struct

Signed-off-by: Chris Coulson <chris.coulson@canonical.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 include/grub/script_sh.h | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/include/grub/script_sh.h b/include/grub/script_sh.h
index 360c2be1f..b382bcf09 100644
--- a/include/grub/script_sh.h
+++ b/include/grub/script_sh.h
@@ -359,13 +359,8 @@ struct grub_script_function
   /* The script function.  */
   struct grub_script *func;
 
-  /* The flags.  */
-  unsigned flags;
-
   /* The next element.  */
   struct grub_script_function *next;
-
-  int references;
 };
 typedef struct grub_script_function *grub_script_function_t;
 

From fdc80d2460e5d3b54f5cde8657f9e171b0b9a376 Mon Sep 17 00:00:00 2001
From: Chris Coulson <chris.coulson@canonical.com>
Date: Fri, 10 Jul 2020 14:41:45 +0100
Subject: script: Avoid a use-after-free when redefining a
 function during execution

Defining a new function with the same name as a previously defined
function causes the grub_script and associated resources for the
previous function to be freed. If the previous function is currently
executing when a function with the same name is defined, this results
in use-after-frees when processing subsequent commands in the original
function.

Instead, reject a new function definition if it has the same name as
a previously defined function, and that function is currently being
executed. Although a behavioural change, this should be backwards
compatible with existing configurations because they can't be
dependent on the current behaviour without being broken.

Fixes: CVE-2020-15706

Signed-off-by: Chris Coulson <chris.coulson@canonical.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/script/execute.c  |  2 ++
 grub-core/script/function.c | 16 +++++++++++++---
 grub-core/script/parser.y   |  3 ++-
 include/grub/script_sh.h    |  2 ++
 4 files changed, 19 insertions(+), 4 deletions(-)

diff --git a/grub-core/script/execute.c b/grub-core/script/execute.c
index c8d6806fe..7e028e135 100644
--- a/grub-core/script/execute.c
+++ b/grub-core/script/execute.c
@@ -838,7 +838,9 @@ grub_script_function_call (grub_script_function_t func, int argc, char **args)
   old_scope = scope;
   scope = &new_scope;
 
+  func->executing++;
   ret = grub_script_execute (func->func);
+  func->executing--;
 
   function_return = 0;
   active_loops = loops;
diff --git a/grub-core/script/function.c b/grub-core/script/function.c
index d36655e51..3aad04bf9 100644
--- a/grub-core/script/function.c
+++ b/grub-core/script/function.c
@@ -34,6 +34,7 @@ grub_script_function_create (struct grub_script_arg *functionname_arg,
   func = (grub_script_function_t) grub_malloc (sizeof (*func));
   if (! func)
     return 0;
+  func->executing = 0;
 
   func->name = grub_strdup (functionname_arg->str);
   if (! func->name)
@@ -60,10 +61,19 @@ grub_script_function_create (struct grub_script_arg *functionname_arg,
       grub_script_function_t q;
 
       q = *p;
-      grub_script_free (q->func);
-      q->func = cmd;
       grub_free (func);
-      func = q;
+      if (q->executing > 0)
+        {
+          grub_error (GRUB_ERR_BAD_ARGUMENT,
+		      N_("attempt to redefine a function being executed"));
+          func = NULL;
+        }
+      else
+        {
+          grub_script_free (q->func);
+          q->func = cmd;
+          func = q;
+        }
     }
   else
     {
diff --git a/grub-core/script/parser.y b/grub-core/script/parser.y
index 4f0ab8319..f80b86b6f 100644
--- a/grub-core/script/parser.y
+++ b/grub-core/script/parser.y
@@ -289,7 +289,8 @@ function: "function" "name"
 	      grub_script_mem_free (state->func_mem);
 	    else {
 	      script->children = state->scripts;
-	      grub_script_function_create ($2, script);
+	      if (!grub_script_function_create ($2, script))
+		grub_script_free (script);
 	    }
 
 	    state->scripts = $<scripts>3;
diff --git a/include/grub/script_sh.h b/include/grub/script_sh.h
index b382bcf09..6c48e0751 100644
--- a/include/grub/script_sh.h
+++ b/include/grub/script_sh.h
@@ -361,6 +361,8 @@ struct grub_script_function
 
   /* The next element.  */
   struct grub_script_function *next;
+
+  unsigned executing;
 };
 typedef struct grub_script_function *grub_script_function_t;
 

From dcc097ac0531485f0785816469370bfcb1a29f60 Mon Sep 17 00:00:00 2001
From: Alexey Makhalov <amakhalov@vmware.com>
Date: Fri, 17 Jul 2020 05:17:26 +0000
Subject: relocator: Fix grub_relocator_alloc_chunk_align() top
 memory allocation

Current implementation of grub_relocator_alloc_chunk_align()
does not allow allocation of the top byte.

Assuming input args are:
  max_addr = 0xfffff000;
  size = 0x1000;

And this is valid. But following overflow protection will
unnecessarily move max_addr one byte down (to 0xffffefff):
  if (max_addr > ~size)
    max_addr = ~size;

~size + 1 will fix the situation. In addition, check size
for non zero to do not zero max_addr.

Signed-off-by: Alexey Makhalov <amakhalov@vmware.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/lib/relocator.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/grub-core/lib/relocator.c b/grub-core/lib/relocator.c
index 5847aac36..f2c1944c2 100644
--- a/grub-core/lib/relocator.c
+++ b/grub-core/lib/relocator.c
@@ -1386,8 +1386,8 @@ grub_relocator_alloc_chunk_align (struct grub_relocator *rel,
   };
   grub_addr_t min_addr2 = 0, max_addr2;
 
-  if (max_addr > ~size)
-    max_addr = ~size;
+  if (size && (max_addr > ~size))
+    max_addr = ~size + 1;
 
 #ifdef GRUB_MACHINE_PCBIOS
   if (min_addr < 0x1000)

From 2db482b906c425aa755fc78e8e8980659b92f5a1 Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Sun, 19 Jul 2020 14:43:31 -0400
Subject: hfsplus: fix two more overflows

Both node->size and node->namelen come from the supplied filesystem,
which may be user-supplied.  We can't trust them for the math unless we
know they don't overflow; making sure they go through calloc() first
will give us that.

Signed-off-by: Peter Jones <pjones@redhat.com>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
---
 grub-core/fs/hfsplus.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/grub-core/fs/hfsplus.c b/grub-core/fs/hfsplus.c
index dae43becc..9c4e4c88c 100644
--- a/grub-core/fs/hfsplus.c
+++ b/grub-core/fs/hfsplus.c
@@ -31,6 +31,7 @@
 #include <grub/hfs.h>
 #include <grub/charset.h>
 #include <grub/hfsplus.h>
+#include <grub/safemath.h>
 
 GRUB_MOD_LICENSE ("GPLv3+");
 
@@ -475,8 +476,12 @@ grub_hfsplus_read_symlink (grub_fshelp_node_t node)
 {
   char *symlink;
   grub_ssize_t numread;
+  grub_size_t sz = node->size;
 
-  symlink = grub_malloc (node->size + 1);
+  if (grub_add (sz, 1, &sz))
+    return NULL;
+
+  symlink = grub_malloc (sz);
   if (!symlink)
     return 0;
 
@@ -715,8 +720,8 @@ list_nodes (void *record, void *hook_arg)
   if (type == GRUB_FSHELP_UNKNOWN)
     return 0;
 
-  filename = grub_malloc (grub_be_to_cpu16 (catkey->namelen)
-			  * GRUB_MAX_UTF8_PER_UTF16 + 1);
+  filename = grub_calloc (grub_be_to_cpu16 (catkey->namelen),
+			  GRUB_MAX_UTF8_PER_UTF16 + 1);
   if (! filename)
     return 0;
 

From fc669c03dbffd20667f40a2375c30ef91cdc2707 Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Sun, 19 Jul 2020 15:48:20 -0400
Subject: lvm: fix two more potential data-dependent alloc
 overflows

It appears to be possible to make a (possibly invalid) lvm PV with a
metadata size field that overflows our type when adding it to the
address we've allocated.  Even if it doesn't, it may be possible to do
so with the math using the outcome of that as an operand.  Check them
both.

Signed-off-by: Peter Jones <pjones@redhat.com>
Signed-off-by: Darren Kenny <darren.kenny@oracle.com>
---
 grub-core/disk/lvm.c | 47 ++++++++++++++++++++++++++++++++++++--------
 1 file changed, 39 insertions(+), 8 deletions(-)

diff --git a/grub-core/disk/lvm.c b/grub-core/disk/lvm.c
index d1df640b3..e1299a348 100644
--- a/grub-core/disk/lvm.c
+++ b/grub-core/disk/lvm.c
@@ -25,6 +25,7 @@
 #include <grub/lvm.h>
 #include <grub/partition.h>
 #include <grub/i18n.h>
+#include <grub/safemath.h>
 
 #ifdef GRUB_UTIL
 #include <grub/emu/misc.h>
@@ -102,10 +103,11 @@ grub_lvm_detect (grub_disk_t disk,
 {
   grub_err_t err;
   grub_uint64_t mda_offset, mda_size;
+  grub_size_t ptr;
   char buf[GRUB_LVM_LABEL_SIZE];
   char vg_id[GRUB_LVM_ID_STRLEN+1];
   char pv_id[GRUB_LVM_ID_STRLEN+1];
-  char *metadatabuf, *p, *q, *vgname;
+  char *metadatabuf, *p, *q, *mda_end, *vgname;
   struct grub_lvm_label_header *lh = (struct grub_lvm_label_header *) buf;
   struct grub_lvm_pv_header *pvh;
   struct grub_lvm_disk_locn *dlocn;
@@ -205,19 +207,31 @@ grub_lvm_detect (grub_disk_t disk,
 		   grub_le_to_cpu64 (rlocn->size) -
 		   grub_le_to_cpu64 (mdah->size));
     }
-  p = q = metadatabuf + grub_le_to_cpu64 (rlocn->offset);
 
-  while (*q != ' ' && q < metadatabuf + mda_size)
-    q++;
-
-  if (q == metadatabuf + mda_size)
+  if (grub_add ((grub_size_t)metadatabuf,
+		(grub_size_t)grub_le_to_cpu64 (rlocn->offset),
+		&ptr))
     {
+error_parsing_metadata:
 #ifdef GRUB_UTIL
       grub_util_info ("error parsing metadata");
 #endif
       goto fail2;
     }
 
+  p = q = (char *)ptr;
+
+  if (grub_add ((grub_size_t)metadatabuf, (grub_size_t)mda_size, &ptr))
+    goto error_parsing_metadata;
+
+  mda_end = (char *)ptr;
+
+  while (*q != ' ' && q < mda_end)
+    q++;
+
+  if (q == mda_end)
+    goto error_parsing_metadata;
+
   vgname_len = q - p;
   vgname = grub_malloc (vgname_len + 1);
   if (!vgname)
@@ -367,8 +381,25 @@ grub_lvm_detect (grub_disk_t disk,
 	      {
 		const char *iptr;
 		char *optr;
-		lv->fullname = grub_malloc (sizeof ("lvm/") - 1 + 2 * vgname_len
-					    + 1 + 2 * s + 1);
+
+		/* this is kind of hard to read with our safe (but rather
+		 * baroque) math primatives, but it boils down to:
+		 *
+		 * sz0 = vgname_len * 2 + 1
+		 *       + s * 2 + 1
+		 *       + sizeof ("lvm/") - 1;
+		 */
+		grub_size_t sz0 = vgname_len, sz1 = s;
+
+		if (grub_mul (sz0, 2, &sz0) ||
+		    grub_add (sz0, 1, &sz0) ||
+		    grub_mul (sz1, 2, &sz1) ||
+		    grub_add (sz1, 1, &sz1) ||
+		    grub_add (sz0, sz1, &sz0) ||
+		    grub_add (sz0, sizeof ("lvm/") - 1, &sz0))
+		  goto lvs_fail;
+
+		lv->fullname = grub_malloc (sz0);
 		if (!lv->fullname)
 		  goto lvs_fail;
 

From c0a2098a2d47a752f9416a655a7010973298f66f Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Sun, 19 Jul 2020 16:08:08 -0400
Subject: emu: make grub_free(NULL) safe

The grub_free() implementation in kern/mm.c safely handles NULL
pointers, and code at many places depends on this.  We don't know that
the same is true on all host OSes, so we need to handle the same
behavior in grub-emu's implementation.

Signed-off-by: Peter Jones <pjones@redhat.com>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
---
 grub-core/kern/emu/mm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/grub-core/kern/emu/mm.c b/grub-core/kern/emu/mm.c
index 145b01d37..4d1046a21 100644
--- a/grub-core/kern/emu/mm.c
+++ b/grub-core/kern/emu/mm.c
@@ -60,7 +60,8 @@ grub_zalloc (grub_size_t size)
 void
 grub_free (void *ptr)
 {
-  free (ptr);
+  if (ptr)
+    free (ptr);
 }
 
 void *

From 9735a4b2f52caf79e5804ca3e959f0f444a8716c Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Sun, 19 Jul 2020 16:53:27 -0400
Subject: efi: fix some malformed device path arithmetic errors.

Several places we take the length of a device path and subtract 4 from
it, without ever checking that it's >= 4.  There are also cases where
this kind of malformation will result in unpredictable iteration,
including treating the length from one dp node as the type in the next
node.  These are all errors, no matter where the data comes from.

This patch adds a checking macro, GRUB_EFI_DEVICE_PATH_VALID(), which
can be used in several places, and makes GRUB_EFI_NEXT_DEVICE_PATH()
return NULL and GRUB_EFI_END_ENTIRE_DEVICE_PATH() evaluate as true when
the length is too small.  Additionally, it makes several places in the
code check for and return errors in these cases.

Signed-off-by: Peter Jones <pjones@redhat.com>
---
 grub-core/kern/efi/efi.c           | 67 +++++++++++++++++++++++++-----
 grub-core/loader/efi/chainloader.c | 19 ++++++++-
 grub-core/loader/i386/xnu.c        |  9 ++--
 include/grub/efi/api.h             | 14 ++++---
 4 files changed, 88 insertions(+), 21 deletions(-)

diff --git a/grub-core/kern/efi/efi.c b/grub-core/kern/efi/efi.c
index ad170c7ce..e12261fd5 100644
--- a/grub-core/kern/efi/efi.c
+++ b/grub-core/kern/efi/efi.c
@@ -360,7 +360,7 @@ grub_efi_get_filename (grub_efi_device_path_t *dp0)
 
   dp = dp0;
 
-  while (1)
+  while (dp)
     {
       grub_efi_uint8_t type = GRUB_EFI_DEVICE_PATH_TYPE (dp);
       grub_efi_uint8_t subtype = GRUB_EFI_DEVICE_PATH_SUBTYPE (dp);
@@ -370,9 +370,15 @@ grub_efi_get_filename (grub_efi_device_path_t *dp0)
       if (type == GRUB_EFI_MEDIA_DEVICE_PATH_TYPE
 	       && subtype == GRUB_EFI_FILE_PATH_DEVICE_PATH_SUBTYPE)
 	{
-	  grub_efi_uint16_t len;
-	  len = ((GRUB_EFI_DEVICE_PATH_LENGTH (dp) - 4)
-		 / sizeof (grub_efi_char16_t));
+	  grub_efi_uint16_t len = GRUB_EFI_DEVICE_PATH_LENGTH (dp);
+
+	  if (len < 4)
+	    {
+	      grub_error (GRUB_ERR_OUT_OF_RANGE,
+			  "malformed EFI Device Path node has length=%d", len);
+	      return NULL;
+	    }
+	  len = (len - 4) / sizeof (grub_efi_char16_t);
 	  filesize += GRUB_MAX_UTF8_PER_UTF16 * len + 2;
 	}
 
@@ -388,7 +394,7 @@ grub_efi_get_filename (grub_efi_device_path_t *dp0)
   if (!name)
     return NULL;
 
-  while (1)
+  while (dp)
     {
       grub_efi_uint8_t type = GRUB_EFI_DEVICE_PATH_TYPE (dp);
       grub_efi_uint8_t subtype = GRUB_EFI_DEVICE_PATH_SUBTYPE (dp);
@@ -404,8 +410,15 @@ grub_efi_get_filename (grub_efi_device_path_t *dp0)
 
 	  *p++ = '/';
 
-	  len = ((GRUB_EFI_DEVICE_PATH_LENGTH (dp) - 4)
-		 / sizeof (grub_efi_char16_t));
+	  len = GRUB_EFI_DEVICE_PATH_LENGTH (dp);
+	  if (len < 4)
+	    {
+	      grub_error (GRUB_ERR_OUT_OF_RANGE,
+			  "malformed EFI Device Path node has length=%d", len);
+	      return NULL;
+	    }
+
+	  len = (len - 4) / sizeof (grub_efi_char16_t);
 	  fp = (grub_efi_file_path_device_path_t *) dp;
 	  /* According to EFI spec Path Name is NULL terminated */
 	  while (len > 0 && fp->path_name[len - 1] == 0)
@@ -480,7 +493,26 @@ grub_efi_duplicate_device_path (const grub_efi_device_path_t *dp)
        ;
        p = GRUB_EFI_NEXT_DEVICE_PATH (p))
     {
-      total_size += GRUB_EFI_DEVICE_PATH_LENGTH (p);
+      grub_size_t len = GRUB_EFI_DEVICE_PATH_LENGTH (p);
+
+      /*
+       * In the event that we find a node that's completely garbage, for
+       * example if we get to 0x7f 0x01 0x02 0x00 ... (EndInstance with a size
+       * of 2), GRUB_EFI_END_ENTIRE_DEVICE_PATH() will be true and
+       * GRUB_EFI_NEXT_DEVICE_PATH() will return NULL, so we won't continue,
+       * and neither should our consumers, but there won't be any error raised
+       * even though the device path is junk.
+       *
+       * This keeps us from passing junk down back to our caller.
+       */
+      if (len < 4)
+	{
+	  grub_error (GRUB_ERR_OUT_OF_RANGE,
+		      "malformed EFI Device Path node has length=%d", len);
+	  return NULL;
+	}
+
+      total_size += len;
       if (GRUB_EFI_END_ENTIRE_DEVICE_PATH (p))
 	break;
     }
@@ -525,7 +557,7 @@ dump_vendor_path (const char *type, grub_efi_vendor_device_path_t *vendor)
 void
 grub_efi_print_device_path (grub_efi_device_path_t *dp)
 {
-  while (1)
+  while (GRUB_EFI_DEVICE_PATH_VALID (dp))
     {
       grub_efi_uint8_t type = GRUB_EFI_DEVICE_PATH_TYPE (dp);
       grub_efi_uint8_t subtype = GRUB_EFI_DEVICE_PATH_SUBTYPE (dp);
@@ -937,7 +969,11 @@ grub_efi_compare_device_paths (const grub_efi_device_path_t *dp1,
     /* Return non-zero.  */
     return 1;
 
-  while (1)
+  if (dp1 == dp2)
+    return 0;
+
+  while (GRUB_EFI_DEVICE_PATH_VALID (dp1)
+	 && GRUB_EFI_DEVICE_PATH_VALID (dp2))
     {
       grub_efi_uint8_t type1, type2;
       grub_efi_uint8_t subtype1, subtype2;
@@ -973,5 +1009,16 @@ grub_efi_compare_device_paths (const grub_efi_device_path_t *dp1,
       dp2 = (grub_efi_device_path_t *) ((char *) dp2 + len2);
     }
 
+  /*
+   * There's no "right" answer here, but we probably don't want to call a valid
+   * dp and an invalid dp equal, so pick one way or the other.
+   */
+  if (GRUB_EFI_DEVICE_PATH_VALID (dp1) &&
+      !GRUB_EFI_DEVICE_PATH_VALID (dp2))
+    return 1;
+  else if (!GRUB_EFI_DEVICE_PATH_VALID (dp1) &&
+	   GRUB_EFI_DEVICE_PATH_VALID (dp2))
+    return -1;
+
   return 0;
 }
diff --git a/grub-core/loader/efi/chainloader.c b/grub-core/loader/efi/chainloader.c
index daf8c6b54..978fab002 100644
--- a/grub-core/loader/efi/chainloader.c
+++ b/grub-core/loader/efi/chainloader.c
@@ -116,6 +116,12 @@ copy_file_path (grub_efi_file_path_device_path_t *fp,
   fp->header.type = GRUB_EFI_MEDIA_DEVICE_PATH_TYPE;
   fp->header.subtype = GRUB_EFI_FILE_PATH_DEVICE_PATH_SUBTYPE;
 
+  if (!GRUB_EFI_DEVICE_PATH_VALID ((grub_efi_device_path_t *)fp))
+    {
+      grub_error (GRUB_ERR_BAD_ARGUMENT, "EFI Device Path is invalid");
+      return;
+    }
+
   path_name = grub_calloc (len, GRUB_MAX_UTF16_PER_UTF8 * sizeof (*path_name));
   if (!path_name)
     return;
@@ -156,9 +162,18 @@ make_file_path (grub_efi_device_path_t *dp, const char *filename)
 
   size = 0;
   d = dp;
-  while (1)
+  while (d)
     {
-      size += GRUB_EFI_DEVICE_PATH_LENGTH (d);
+      grub_size_t len = GRUB_EFI_DEVICE_PATH_LENGTH (d);
+
+      if (len < 4)
+	{
+	  grub_error (GRUB_ERR_OUT_OF_RANGE,
+		      "malformed EFI Device Path node has length=%d", len);
+	  return NULL;
+	}
+
+      size += len;
       if ((GRUB_EFI_END_ENTIRE_DEVICE_PATH (d)))
 	break;
       d = GRUB_EFI_NEXT_DEVICE_PATH (d);
diff --git a/grub-core/loader/i386/xnu.c b/grub-core/loader/i386/xnu.c
index e9e119259..a70093607 100644
--- a/grub-core/loader/i386/xnu.c
+++ b/grub-core/loader/i386/xnu.c
@@ -515,14 +515,15 @@ grub_cmd_devprop_load (grub_command_t cmd __attribute__ ((unused)),
 
       devhead = buf;
       buf = devhead + 1;
-      dpstart = buf;
+      dp = dpstart = buf;
 
-      do
+      while (GRUB_EFI_DEVICE_PATH_VALID (dp) && buf < bufend)
 	{
-	  dp = buf;
 	  buf = (char *) buf + GRUB_EFI_DEVICE_PATH_LENGTH (dp);
+	  if (GRUB_EFI_END_ENTIRE_DEVICE_PATH (dp))
+	    break;
+	  dp = buf;
 	}
-      while (!GRUB_EFI_END_ENTIRE_DEVICE_PATH (dp) && buf < bufend);
 
       dev = grub_xnu_devprop_add_device (dpstart, (char *) buf
 					 - (char *) dpstart);
diff --git a/include/grub/efi/api.h b/include/grub/efi/api.h
index 75befd10e..a3f4df91d 100644
--- a/include/grub/efi/api.h
+++ b/include/grub/efi/api.h
@@ -635,6 +635,7 @@ typedef struct grub_efi_device_path grub_efi_device_path_protocol_t;
 #define GRUB_EFI_DEVICE_PATH_TYPE(dp)		((dp)->type & 0x7f)
 #define GRUB_EFI_DEVICE_PATH_SUBTYPE(dp)	((dp)->subtype)
 #define GRUB_EFI_DEVICE_PATH_LENGTH(dp)		((dp)->length)
+#define GRUB_EFI_DEVICE_PATH_VALID(dp)		((dp) != NULL && GRUB_EFI_DEVICE_PATH_LENGTH (dp) >= 4)
 
 /* The End of Device Path nodes.  */
 #define GRUB_EFI_END_DEVICE_PATH_TYPE			(0xff & 0x7f)
@@ -643,13 +644,16 @@ typedef struct grub_efi_device_path grub_efi_device_path_protocol_t;
 #define GRUB_EFI_END_THIS_DEVICE_PATH_SUBTYPE		0x01
 
 #define GRUB_EFI_END_ENTIRE_DEVICE_PATH(dp)	\
-  (GRUB_EFI_DEVICE_PATH_TYPE (dp) == GRUB_EFI_END_DEVICE_PATH_TYPE \
-   && (GRUB_EFI_DEVICE_PATH_SUBTYPE (dp) \
-       == GRUB_EFI_END_ENTIRE_DEVICE_PATH_SUBTYPE))
+  (!GRUB_EFI_DEVICE_PATH_VALID (dp) || \
+   (GRUB_EFI_DEVICE_PATH_TYPE (dp) == GRUB_EFI_END_DEVICE_PATH_TYPE \
+    && (GRUB_EFI_DEVICE_PATH_SUBTYPE (dp) \
+	== GRUB_EFI_END_ENTIRE_DEVICE_PATH_SUBTYPE)))
 
 #define GRUB_EFI_NEXT_DEVICE_PATH(dp)	\
-  ((grub_efi_device_path_t *) ((char *) (dp) \
-                               + GRUB_EFI_DEVICE_PATH_LENGTH (dp)))
+  (GRUB_EFI_DEVICE_PATH_VALID (dp) \
+   ? ((grub_efi_device_path_t *) \
+      ((char *) (dp) + GRUB_EFI_DEVICE_PATH_LENGTH (dp))) \
+   : NULL)
 
 /* Hardware Device Path.  */
 #define GRUB_EFI_HARDWARE_DEVICE_PATH_TYPE		1

From c5763039a630dee079f0afbd5ced9cd74efe0b71 Mon Sep 17 00:00:00 2001
From: Chris Coulson <chris.coulson@canonical.com>
Date: Wed, 22 Jul 2020 17:06:04 +0100
Subject: Fix a regression caused by "efi: fix some malformed
 device path arithmetic errors"

This commit introduced a bogus check inside copy_file_path to
determine whether the destination grub_efi_file_path_device_path_t
was valid before anything was copied to it. Depending on the
contents of the heap buffer, this check could fail which would
result in copy_file_path returning early.

Without any error propagated to the caller, make_file_path would
then try to advance the invalid device path node with
GRUB_EFI_NEXT_DEVICE_PATH, which would also fail, returning a NULL
pointer that would subsequently be dereferenced.

Remove the bogus check, and also propagate errors from copy_file_path.
---
 grub-core/loader/efi/chainloader.c | 25 +++++++++++++------------
 1 file changed, 13 insertions(+), 12 deletions(-)

diff --git a/grub-core/loader/efi/chainloader.c b/grub-core/loader/efi/chainloader.c
index 978fab002..e9b06242a 100644
--- a/grub-core/loader/efi/chainloader.c
+++ b/grub-core/loader/efi/chainloader.c
@@ -106,7 +106,7 @@ grub_chainloader_boot (void)
   return grub_errno;
 }
 
-static void
+static grub_err_t
 copy_file_path (grub_efi_file_path_device_path_t *fp,
 		const char *str, grub_efi_uint16_t len)
 {
@@ -116,15 +116,9 @@ copy_file_path (grub_efi_file_path_device_path_t *fp,
   fp->header.type = GRUB_EFI_MEDIA_DEVICE_PATH_TYPE;
   fp->header.subtype = GRUB_EFI_FILE_PATH_DEVICE_PATH_SUBTYPE;
 
-  if (!GRUB_EFI_DEVICE_PATH_VALID ((grub_efi_device_path_t *)fp))
-    {
-      grub_error (GRUB_ERR_BAD_ARGUMENT, "EFI Device Path is invalid");
-      return;
-    }
-
   path_name = grub_calloc (len, GRUB_MAX_UTF16_PER_UTF8 * sizeof (*path_name));
   if (!path_name)
-    return;
+    return grub_error (GRUB_ERR_OUT_OF_MEMORY, "failed to allocate path buffer");
 
   size = grub_utf8_to_utf16 (path_name, len * GRUB_MAX_UTF16_PER_UTF8,
 			     (const grub_uint8_t *) str, len, 0);
@@ -137,6 +131,7 @@ copy_file_path (grub_efi_file_path_device_path_t *fp,
   fp->path_name[size++] = '\0';
   fp->header.length = size * sizeof (grub_efi_char16_t) + sizeof (*fp);
   grub_free (path_name);
+  return GRUB_ERR_NONE;
 }
 
 static grub_efi_device_path_t *
@@ -195,13 +190,19 @@ make_file_path (grub_efi_device_path_t *dp, const char *filename)
   d = (grub_efi_device_path_t *) ((char *) file_path
 				  + ((char *) d - (char *) dp));
   grub_efi_print_device_path (d);
-  copy_file_path ((grub_efi_file_path_device_path_t *) d,
-		  dir_start, dir_end - dir_start);
+  if (copy_file_path ((grub_efi_file_path_device_path_t *) d,
+		      dir_start, dir_end - dir_start) != GRUB_ERR_NONE)
+    {
+    fail:
+      grub_free (file_path);
+      return 0;
+    }
 
   /* Fill the file path for the file.  */
   d = GRUB_EFI_NEXT_DEVICE_PATH (d);
-  copy_file_path ((grub_efi_file_path_device_path_t *) d,
-		  dir_end + 1, grub_strlen (dir_end + 1));
+  if (copy_file_path ((grub_efi_file_path_device_path_t *) d,
+		      dir_end + 1, grub_strlen (dir_end + 1)) != GRUB_ERR_NONE)
+    goto fail;
 
   /* Fill the end of device path nodes.  */
   d = GRUB_EFI_NEXT_DEVICE_PATH (d);

From 3e6aa687d9a2f8d172536a67d0d0f8bc7adb3108 Mon Sep 17 00:00:00 2001
From: Alexander Burmashev <alexander.burmashev@oracle.com>
Date: Wed, 22 Jul 2020 06:04:38 -0700
Subject: update safemath with fallback code for gcc older than
 5.1

The code used in the header was taken from linux kernel commit
f0907827a8a9152aedac2833ed1b674a7b2a44f2.  Rasmus Villemoes
<linux@rasmusvillemoes.dk>, the original author of the patch, was
contacted directly, confirmed his authorship of the code, and gave his
permission on treating that dual license as MIT and including into GRUB2
sources

Signed-off-by: Alex Burmashev <alexander.burmashev@oracle.com>
---
 include/grub/safemath.h | 119 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 118 insertions(+), 1 deletion(-)

diff --git a/include/grub/safemath.h b/include/grub/safemath.h
index c17b89bba..1ccac276b 100644
--- a/include/grub/safemath.h
+++ b/include/grub/safemath.h
@@ -31,7 +31,124 @@
 #define grub_mul(a, b, res)	__builtin_mul_overflow(a, b, res)
 
 #else
-#error gcc 5.1 or newer or clang 3.8 or newer is required
+/*
+ * Copyright 2020 Rasmus Villemoes
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+/*
+ * The code used in this header was taken from linux kernel commit
+ * f0907827a8a9152aedac2833ed1b674a7b2a44f2
+ * Rasmus Villemoes <linux@rasmusvillemoes.dk>, the original author of the
+ * patch, was contacted directly, confirmed his authorship of the code, and
+ * gave his permission on treating that dual license as MIT and including into
+ * GRUB2 sources
+ */
+
+#include <grub/types.h>
+#define is_signed_type(type)	(((type)(-1)) < (type)1)
+#define __type_half_max(type)	((type)1 << (8*sizeof(type) - 1 - is_signed_type(type)))
+#define type_max(T)		((T)((__type_half_max(T) - 1) + __type_half_max(T)))
+#define type_min(T)		((T)((T)-type_max(T)-(T)1))
+
+#define __unsigned_add_overflow(a, b, d) ({	\
+	typeof(+(a)) __a = (a);			\
+	typeof(+(b)) __b = (b);			\
+	typeof(d) __d = (d);			\
+	(void) (&__a == &__b);			\
+	(void) (&__a == __d);			\
+	*__d = __a + __b;			\
+	*__d < __a;				\
+})
+#define __unsigned_sub_overflow(a, b, d) ({     \
+	typeof(+(a)) __a = (a);			\
+	typeof(+(b)) __b = (b);			\
+	typeof(d) __d = (d);			\
+	(void) (&__a == &__b);			\
+	(void) (&__a == __d);			\
+	*__d = __a - __b;			\
+	__a < __b;				\
+})
+#define __unsigned_mul_overflow(a, b, d) ({		\
+	typeof(+(a)) __a = (a);				\
+	typeof(+(b)) __b = (b);				\
+	typeof(d) __d = (d);				\
+	(void) (&__a == &__b);				\
+	(void) (&__a == __d);				\
+	*__d = __a * __b;				\
+	__builtin_constant_p(__b) ?			\
+	  __b > 0 && __a > type_max(typeof(__a)) / __b :\
+	  __a > 0 && __b > type_max(typeof(__b)) / __a; \
+})
+
+#define __signed_add_overflow(a, b, d) ({		\
+	typeof(+(a)) __a = (a);				\
+	typeof(+(b)) __b = (b);				\
+	typeof(d) __d = (d);				\
+	(void) (&__a == &__b);				\
+	(void) (&__a == __d);				\
+	*__d = (grub_uint64_t)__a + (grub_uint64_t)__b;	\
+	(((~(__a ^ __b)) & (*__d ^ __a))		\
+		& type_min(typeof(__a))) != 0;		\
+})
+
+#define __signed_sub_overflow(a, b, d) ({		\
+	typeof(+(a)) __a = (a);				\
+	typeof(+(b)) __b = (b);				\
+	typeof(d) __d = (d);				\
+	(void) (&__a == &__b);				\
+	(void) (&__a == __d);				\
+	*__d = (grub_uint64_t)__a - (grub_uint64_t)__b;	\
+	((((__a ^ __b)) & (*__d ^ __a))			\
+		& type_min(typeof(__a))) != 0;		\
+})
+
+#define __signed_mul_overflow(a, b, d) ({			\
+	typeof(+(a)) __a = (a);					\
+	typeof(+(b)) __b = (b);					\
+	typeof(d) __d = (d);					\
+	typeof(+(a)) __tmax = type_max(typeof(+(a)));		\
+	typeof(+(a)) __tmin = type_min(typeof(+(a)));		\
+	(void) (&__a == &__b);					\
+	(void) (&__a == __d);					\
+	*__d = (grub_uint64_t)__a * (grub_uint64_t)__b;		\
+	(__b > 0   && (__a > __tmax/__b || __a < __tmin/__b)) ||\
+	(__b < (typeof(__b))-1  &&				\
+	 (__a > __tmin/__b || __a < __tmax/__b)) ||		\
+	(__b == (typeof(__b))-1 && __a == __tmin);		\
+})
+
+#define grub_add(a, b, d)					\
+	__builtin_choose_expr(is_signed_type(typeof(+(a))),	\
+			__signed_add_overflow(a, b, d),		\
+			__unsigned_add_overflow(a, b, d))
+
+#define grub_sub(a, b, d)					\
+	__builtin_choose_expr(is_signed_type(typeof(+(a))),	\
+			__signed_sub_overflow(a, b, d),		\
+			__unsigned_sub_overflow(a, b, d))
+
+#define grub_mul(a, b, d)					\
+	__builtin_choose_expr(is_signed_type(typeof(+(a))),	\
+			__signed_mul_overflow(a, b, d),		\
+			__unsigned_mul_overflow(a, b, d))
+
 #endif
 
 #endif /* GRUB_SAFEMATH_H */

From bb5fc65035e82509b0565bfe2994fbe6cc11016e Mon Sep 17 00:00:00 2001
From: Alexey Makhalov <amakhalov@vmware.com>
Date: Mon, 20 Jul 2020 23:03:05 +0000
Subject: efi: Fix use-after-free in halt/reboot path

commit 92bfc33db984 ("efi: Free malloc regions on exit")
introduced memory freeing in grub_efi_fini(), which is
used not only by exit path but by halt/reboot one as well.
As result of memory freeing, code and data regions used by
modules, such as halt, reboot, acpi (used by halt) also got
freed. After return to module code, CPU executes, filled
by UEFI firmware (tested with edk2), 0xAFAFAFAF pattern as
a code. Which leads to #UD exception later.

grub> halt
!!!! X64 Exception Type - 06(#UD - Invalid Opcode)  CPU Apic ID - 00000000 !!!!
RIP  - 0000000003F4EC28, CS  - 0000000000000038, RFLAGS - 0000000000200246
RAX  - 0000000000000000, RCX - 00000000061DA188, RDX - 0A74C0854DC35D41
RBX  - 0000000003E10E08, RSP - 0000000007F0F860, RBP - 0000000000000000
RSI  - 00000000064DB768, RDI - 000000000832C5C3
R8   - 0000000000000002, R9  - 0000000000000000, R10 - 00000000061E2E52
R11  - 0000000000000020, R12 - 0000000003EE5C1F, R13 - 00000000061E0FF4
R14  - 0000000003E10D80, R15 - 00000000061E2F60
DS   - 0000000000000030, ES  - 0000000000000030, FS  - 0000000000000030
GS   - 0000000000000030, SS  - 0000000000000030
CR0  - 0000000080010033, CR2 - 0000000000000000, CR3 - 0000000007C01000
CR4  - 0000000000000668, CR8 - 0000000000000000
DR0  - 0000000000000000, DR1 - 0000000000000000, DR2 - 0000000000000000
DR3  - 0000000000000000, DR6 - 00000000FFFF0FF0, DR7 - 0000000000000400
GDTR - 00000000079EEA98 0000000000000047, LDTR - 0000000000000000
IDTR - 0000000007598018 0000000000000FFF,   TR - 0000000000000000
FXSAVE_STATE - 0000000007F0F4C0

Proposal here is to continue to free allocated memory for
exit boot services path but keep it for halt/reboot path
as it won't be much security concern here.
Introduced GRUB_LOADER_FLAG_EFI_KEEP_ALLOCATED_MEMORY
loader flag to be used by efi halt/reboot path.

Signed-off-by: Alexey Makhalov <amakhalov@vmware.com>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
---
 grub-core/kern/arm/efi/init.c   | 3 +++
 grub-core/kern/arm64/efi/init.c | 3 +++
 grub-core/kern/efi/efi.c        | 3 ++-
 grub-core/kern/efi/init.c       | 1 -
 grub-core/kern/i386/efi/init.c  | 9 +++++++--
 grub-core/kern/ia64/efi/init.c  | 9 +++++++--
 grub-core/kern/riscv/efi/init.c | 3 +++
 grub-core/lib/efi/halt.c        | 3 ++-
 include/grub/loader.h           | 1 +
 9 files changed, 28 insertions(+), 7 deletions(-)

diff --git a/grub-core/kern/arm/efi/init.c b/grub-core/kern/arm/efi/init.c
index 06df60e2f..40c3b467f 100644
--- a/grub-core/kern/arm/efi/init.c
+++ b/grub-core/kern/arm/efi/init.c
@@ -71,4 +71,7 @@ grub_machine_fini (int flags)
   efi_call_1 (b->close_event, tmr_evt);
 
   grub_efi_fini ();
+
+  if (!(flags & GRUB_LOADER_FLAG_EFI_KEEP_ALLOCATED_MEMORY))
+    grub_efi_memory_fini ();
 }
diff --git a/grub-core/kern/arm64/efi/init.c b/grub-core/kern/arm64/efi/init.c
index 6224999ec..5010caefd 100644
--- a/grub-core/kern/arm64/efi/init.c
+++ b/grub-core/kern/arm64/efi/init.c
@@ -57,4 +57,7 @@ grub_machine_fini (int flags)
     return;
 
   grub_efi_fini ();
+
+  if (!(flags & GRUB_LOADER_FLAG_EFI_KEEP_ALLOCATED_MEMORY))
+    grub_efi_memory_fini ();
 }
diff --git a/grub-core/kern/efi/efi.c b/grub-core/kern/efi/efi.c
index e12261fd5..acb38d61f 100644
--- a/grub-core/kern/efi/efi.c
+++ b/grub-core/kern/efi/efi.c
@@ -157,7 +157,8 @@ grub_efi_get_loaded_image (grub_efi_handle_t image_handle)
 void
 grub_reboot (void)
 {
-  grub_machine_fini (GRUB_LOADER_FLAG_NORETURN);
+  grub_machine_fini (GRUB_LOADER_FLAG_NORETURN |
+		     GRUB_LOADER_FLAG_EFI_KEEP_ALLOCATED_MEMORY);
   efi_call_4 (grub_efi_system_table->runtime_services->reset_system,
               GRUB_EFI_RESET_COLD, GRUB_EFI_SUCCESS, 0, NULL);
   for (;;) ;
diff --git a/grub-core/kern/efi/init.c b/grub-core/kern/efi/init.c
index 3dfdf2d22..2c31847bf 100644
--- a/grub-core/kern/efi/init.c
+++ b/grub-core/kern/efi/init.c
@@ -80,5 +80,4 @@ grub_efi_fini (void)
 {
   grub_efidisk_fini ();
   grub_console_fini ();
-  grub_efi_memory_fini ();
 }
diff --git a/grub-core/kern/i386/efi/init.c b/grub-core/kern/i386/efi/init.c
index da499aba0..deb2eacd8 100644
--- a/grub-core/kern/i386/efi/init.c
+++ b/grub-core/kern/i386/efi/init.c
@@ -39,6 +39,11 @@ grub_machine_init (void)
 void
 grub_machine_fini (int flags)
 {
-  if (flags & GRUB_LOADER_FLAG_NORETURN)
-    grub_efi_fini ();
+  if (!(flags & GRUB_LOADER_FLAG_NORETURN))
+    return;
+
+  grub_efi_fini ();
+
+  if (!(flags & GRUB_LOADER_FLAG_EFI_KEEP_ALLOCATED_MEMORY))
+    grub_efi_memory_fini ();
 }
diff --git a/grub-core/kern/ia64/efi/init.c b/grub-core/kern/ia64/efi/init.c
index b5ecbd091..f1965571b 100644
--- a/grub-core/kern/ia64/efi/init.c
+++ b/grub-core/kern/ia64/efi/init.c
@@ -70,6 +70,11 @@ grub_machine_init (void)
 void
 grub_machine_fini (int flags)
 {
-  if (flags & GRUB_LOADER_FLAG_NORETURN)
-    grub_efi_fini ();
+  if (!(flags & GRUB_LOADER_FLAG_NORETURN))
+    return;
+
+  grub_efi_fini ();
+
+  if (!(flags & GRUB_LOADER_FLAG_EFI_KEEP_ALLOCATED_MEMORY))
+    grub_efi_memory_fini ();
 }
diff --git a/grub-core/kern/riscv/efi/init.c b/grub-core/kern/riscv/efi/init.c
index 7eb1969d0..38795fe67 100644
--- a/grub-core/kern/riscv/efi/init.c
+++ b/grub-core/kern/riscv/efi/init.c
@@ -73,4 +73,7 @@ grub_machine_fini (int flags)
     return;
 
   grub_efi_fini ();
+
+  if (!(flags & GRUB_LOADER_FLAG_EFI_KEEP_ALLOCATED_MEMORY))
+    grub_efi_memory_fini ();
 }
diff --git a/grub-core/lib/efi/halt.c b/grub-core/lib/efi/halt.c
index 5859f0498..29d413641 100644
--- a/grub-core/lib/efi/halt.c
+++ b/grub-core/lib/efi/halt.c
@@ -28,7 +28,8 @@
 void
 grub_halt (void)
 {
-  grub_machine_fini (GRUB_LOADER_FLAG_NORETURN);
+  grub_machine_fini (GRUB_LOADER_FLAG_NORETURN |
+		     GRUB_LOADER_FLAG_EFI_KEEP_ALLOCATED_MEMORY);
 #if !defined(__ia64__) && !defined(__arm__) && !defined(__aarch64__) && \
     !defined(__riscv)
   grub_acpi_halt ();
diff --git a/include/grub/loader.h b/include/grub/loader.h
index 7f82a499f..b20864282 100644
--- a/include/grub/loader.h
+++ b/include/grub/loader.h
@@ -33,6 +33,7 @@ enum
 {
   GRUB_LOADER_FLAG_NORETURN = 1,
   GRUB_LOADER_FLAG_PXE_NOT_UNLOAD = 2,
+  GRUB_LOADER_FLAG_EFI_KEEP_ALLOCATED_MEMORY = 4,
 };
 
 void EXPORT_FUNC (grub_loader_set) (grub_err_t (*boot) (void),

From 6d438b80c4cfe75a67f619918706630ccc2252b6 Mon Sep 17 00:00:00 2001
From: Peter Jones <pjones@redhat.com>
Date: Fri, 24 Jul 2020 13:57:27 -0400
Subject: linux loader: avoid overflow on initrd size calculation

Signed-off-by: Peter Jones <pjones@redhat.com>
---
 grub-core/loader/linux.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/grub-core/loader/linux.c b/grub-core/loader/linux.c
index 471b214d6..25624ebc1 100644
--- a/grub-core/loader/linux.c
+++ b/grub-core/loader/linux.c
@@ -151,8 +151,8 @@ grub_initrd_init (int argc, char *argv[],
   initrd_ctx->nfiles = 0;
   initrd_ctx->components = 0;
 
-  initrd_ctx->components = grub_zalloc (argc
-					* sizeof (initrd_ctx->components[0]));
+  initrd_ctx->components = grub_calloc (argc,
+					sizeof (initrd_ctx->components[0]));
   if (!initrd_ctx->components)
     return grub_errno;
 

From 81fae35a346bef8f7b27ba8d186a18ae21281755 Mon Sep 17 00:00:00 2001
From: Colin Watson <cjwatson@debian.org>
Date: Sat, 25 Jul 2020 12:15:37 +0100
Subject: linux: Fix integer overflows in initrd size handling

These could be triggered by a crafted filesystem with very large files.

Fixes: CVE-2020-15707

Signed-off-by: Colin Watson <cjwatson@debian.org>
Reviewed-by: Jan Setje-Eilers <jan.setjeeilers@oracle.com>
---
 grub-core/loader/linux.c | 74 +++++++++++++++++++++++++++++-----------
 1 file changed, 54 insertions(+), 20 deletions(-)

diff --git a/grub-core/loader/linux.c b/grub-core/loader/linux.c
index 25624ebc1..e9f819ee9 100644
--- a/grub-core/loader/linux.c
+++ b/grub-core/loader/linux.c
@@ -4,6 +4,7 @@
 #include <grub/misc.h>
 #include <grub/file.h>
 #include <grub/mm.h>
+#include <grub/safemath.h>
 
 struct newc_head
 {
@@ -98,13 +99,13 @@ free_dir (struct dir *root)
   grub_free (root);
 }
 
-static grub_size_t
+static grub_err_t
 insert_dir (const char *name, struct dir **root,
-	    grub_uint8_t *ptr)
+	    grub_uint8_t *ptr, grub_size_t *size)
 {
   struct dir *cur, **head = root;
   const char *cb, *ce = name;
-  grub_size_t size = 0;
+  *size = 0;
   while (1)
     {
       for (cb = ce; *cb == '/'; cb++);
@@ -130,14 +131,22 @@ insert_dir (const char *name, struct dir **root,
 	      ptr = make_header (ptr, name, ce - name,
 				 040777, 0);
 	    }
-	  size += ALIGN_UP ((ce - (char *) name)
-			    + sizeof (struct newc_head), 4);
+	  if (grub_add (*size,
+		        ALIGN_UP ((ce - (char *) name)
+				  + sizeof (struct newc_head), 4),
+			size))
+	    {
+	      grub_error (GRUB_ERR_OUT_OF_RANGE, N_("overflow is detected"));
+	      grub_free (n->name);
+	      grub_free (n);
+	      return grub_errno;
+	    }
 	  *head = n;
 	  cur = n;
 	}
       root = &cur->next;
     }
-  return size;
+  return GRUB_ERR_NONE;
 }
 
 grub_err_t
@@ -173,26 +182,33 @@ grub_initrd_init (int argc, char *argv[],
 	  eptr = grub_strchr (ptr, ':');
 	  if (eptr)
 	    {
+	      grub_size_t dir_size, name_len;
+
 	      initrd_ctx->components[i].newc_name = grub_strndup (ptr, eptr - ptr);
-	      if (!initrd_ctx->components[i].newc_name)
+	      if (!initrd_ctx->components[i].newc_name ||
+		  insert_dir (initrd_ctx->components[i].newc_name, &root, 0,
+			      &dir_size))
 		{
 		  grub_initrd_close (initrd_ctx);
 		  return grub_errno;
 		}
-	      initrd_ctx->size
-		+= ALIGN_UP (sizeof (struct newc_head)
-			    + grub_strlen (initrd_ctx->components[i].newc_name),
-			     4);
-	      initrd_ctx->size += insert_dir (initrd_ctx->components[i].newc_name,
-					      &root, 0);
+	      name_len = grub_strlen (initrd_ctx->components[i].newc_name);
+	      if (grub_add (initrd_ctx->size,
+			    ALIGN_UP (sizeof (struct newc_head) + name_len, 4),
+			    &initrd_ctx->size) ||
+		  grub_add (initrd_ctx->size, dir_size, &initrd_ctx->size))
+		goto overflow;
 	      newc = 1;
 	      fname = eptr + 1;
 	    }
 	}
       else if (newc)
 	{
-	  initrd_ctx->size += ALIGN_UP (sizeof (struct newc_head)
-					+ sizeof ("TRAILER!!!") - 1, 4);
+	  if (grub_add (initrd_ctx->size,
+			ALIGN_UP (sizeof (struct newc_head)
+				  + sizeof ("TRAILER!!!") - 1, 4),
+			&initrd_ctx->size))
+	    goto overflow;
 	  free_dir (root);
 	  root = 0;
 	  newc = 0;
@@ -208,19 +224,29 @@ grub_initrd_init (int argc, char *argv[],
       initrd_ctx->nfiles++;
       initrd_ctx->components[i].size
 	= grub_file_size (initrd_ctx->components[i].file);
-      initrd_ctx->size += initrd_ctx->components[i].size;
+      if (grub_add (initrd_ctx->size, initrd_ctx->components[i].size,
+		    &initrd_ctx->size))
+	goto overflow;
     }
 
   if (newc)
     {
       initrd_ctx->size = ALIGN_UP (initrd_ctx->size, 4);
-      initrd_ctx->size += ALIGN_UP (sizeof (struct newc_head)
-				    + sizeof ("TRAILER!!!") - 1, 4);
+      if (grub_add (initrd_ctx->size,
+		    ALIGN_UP (sizeof (struct newc_head)
+			      + sizeof ("TRAILER!!!") - 1, 4),
+		    &initrd_ctx->size))
+	goto overflow;
       free_dir (root);
       root = 0;
     }
   
   return GRUB_ERR_NONE;
+
+overflow:
+  free_dir (root);
+  grub_initrd_close (initrd_ctx);
+  return grub_error (GRUB_ERR_OUT_OF_RANGE, N_("overflow is detected"));
 }
 
 grub_size_t
@@ -261,8 +287,16 @@ grub_initrd_load (struct grub_linux_initrd_context *initrd_ctx,
 
       if (initrd_ctx->components[i].newc_name)
 	{
-	  ptr += insert_dir (initrd_ctx->components[i].newc_name,
-			     &root, ptr);
+	  grub_size_t dir_size;
+
+	  if (insert_dir (initrd_ctx->components[i].newc_name, &root, ptr,
+			  &dir_size))
+	    {
+	      free_dir (root);
+	      grub_initrd_close (initrd_ctx);
+	      return grub_errno;
+	    }
+	  ptr += dir_size;
 	  ptr = make_header (ptr, initrd_ctx->components[i].newc_name,
 			     grub_strlen (initrd_ctx->components[i].newc_name),
 			     0100777,