Update to 2.26-3

1 files changed, 110 insertions, 0 deletions

diff --git a/0001-Don-t-use-IFUNC-resolver-for-longjmp-or-system-in-li.patch b/0001-Don-t-use-IFUNC-resolver-for-longjmp-or-system-in-li.patch
new file mode 100644
index 000000000000..5bd40130dee2
--- /dev/null
+++ b/0001-Don-t-use-IFUNC-resolver-for-longjmp-or-system-in-li.patch
@@ -0,0 +1,110 @@
+From fc5ad7024c620cdfe9b76e94638aac83b99c5bf8 Mon Sep 17 00:00:00 2001
+From: Andreas Schwab <schwab@suse.de>
+Date: Tue, 8 Aug 2017 16:21:58 +0200
+Subject: [PATCH] Don't use IFUNC resolver for longjmp or system in libpthread
+ (bug 21041)
+
+Unlike the vfork forwarder and like the fork forwarder as in bug 19861,
+there won't be a problem when the compiler does not turn this into a tail
+call.
+---
+ nptl/pt-longjmp.c | 31 ++++++++++---------------------
+ nptl/pt-system.c  | 24 ++++++++----------------
+ 3 files changed, 18 insertions(+), 37 deletions(-)
+
+diff --git a/nptl/pt-longjmp.c b/nptl/pt-longjmp.c
+index 2ef757e687f..8f3c6b3a09f 100644
+--- a/nptl/pt-longjmp.c
++++ b/nptl/pt-longjmp.c
+@@ -25,21 +25,14 @@
+    symbol in libpthread, but the historical ABI requires it.  For static
+    linking, there is no need to provide anything here--the libc version
+    will be linked in.  For shared library ABI compatibility, there must be
+-   longjmp and siglongjmp symbols in libpthread.so; so we define them using
+-   IFUNC to redirect to the libc function.  */
++   longjmp and siglongjmp symbols in libpthread.so.
+ 
+-#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_22)
+-
+-# if HAVE_IFUNC
+-
+-#  undef INIT_ARCH
+-#  define INIT_ARCH()
+-#  define DEFINE_LONGJMP(name) libc_ifunc (name, &__libc_longjmp)
+-
+-extern __typeof(longjmp) longjmp_ifunc;
+-extern __typeof(siglongjmp) siglongjmp_ifunc;
++   With an IFUNC resolver, it would be possible to avoid the indirection,
++   but the IFUNC resolver might run before the __libc_longjmp symbol has
++   been relocated, in which case the IFUNC resolver would not be able to
++   provide the correct address.  */
+ 
+-# else  /* !HAVE_IFUNC */
++#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_22)
+ 
+ static void __attribute__ ((noreturn, used))
+ longjmp_compat (jmp_buf env, int val)
+@@ -47,14 +40,10 @@ longjmp_compat (jmp_buf env, int val)
+   __libc_longjmp (env, val);
+ }
+ 
+-# define DEFINE_LONGJMP(name) strong_alias (longjmp_compat, name)
+-
+-# endif  /* HAVE_IFUNC */
+-
+-DEFINE_LONGJMP (longjmp_ifunc)
+-compat_symbol (libpthread, longjmp_ifunc, longjmp, GLIBC_2_0);
++strong_alias (longjmp_compat, longjmp_alias)
++compat_symbol (libpthread, longjmp_alias, longjmp, GLIBC_2_0);
+ 
+-strong_alias (longjmp_ifunc, siglongjmp_ifunc)
+-compat_symbol (libpthread, siglongjmp_ifunc, siglongjmp, GLIBC_2_0);
++strong_alias (longjmp_alias, siglongjmp_alias)
++compat_symbol (libpthread, siglongjmp_alias, siglongjmp, GLIBC_2_0);
+ 
+ #endif
+diff --git a/nptl/pt-system.c b/nptl/pt-system.c
+index f8ca6ba0d94..b30ddf2b398 100644
+--- a/nptl/pt-system.c
++++ b/nptl/pt-system.c
+@@ -25,29 +25,21 @@
+    libpthread, but the historical ABI requires it.  For static linking,
+    there is no need to provide anything here--the libc version will be
+    linked in.  For shared library ABI compatibility, there must be a
+-   'system' symbol in libpthread.so; so we define it using IFUNC to
+-   redirect to the libc function.  */
++   'system' symbol in libpthread.so.
+ 
+-#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_22)
+-
+-# if HAVE_IFUNC
+-
+-extern __typeof(system) system_ifunc;
+-#  undef INIT_ARCH
+-#  define INIT_ARCH()
+-libc_ifunc (system_ifunc, &__libc_system)
++   With an IFUNC resolver, it would be possible to avoid the indirection,
++   but the IFUNC resolver might run before the __libc_system symbol has
++   been relocated, in which case the IFUNC resolver would not be able to
++   provide the correct address.  */
+ 
+-# else  /* !HAVE_IFUNC */
++#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_22)
+ 
+ static int __attribute__ ((used))
+ system_compat (const char *line)
+ {
+   return __libc_system (line);
+ }
+-strong_alias (system_compat, system_ifunc)
+-
+-# endif  /* HAVE_IFUNC */
+-
+-compat_symbol (libpthread, system_ifunc, system, GLIBC_2_0);
++strong_alias (system_compat, system_alias)
++compat_symbol (libpthread, system_alias, system, GLIBC_2_0);
+ 
+ #endif
+-- 
+2.14.1
+