Update based on upstream

1 files changed, 308 insertions, 0 deletions

diff --git a/0001-nptl_db-Support-different-libpthread-ld.so-load-orde.patch b/0001-nptl_db-Support-different-libpthread-ld.so-load-orde.patch
new file mode 100644
index 000000000000..0b9c2efd4fe1
--- /dev/null
+++ b/0001-nptl_db-Support-different-libpthread-ld.so-load-orde.patch
@@ -0,0 +1,308 @@
+From a64afc225240b2b27129ccfb0516d7c958b98040 Mon Sep 17 00:00:00 2001
+From: Florian Weimer <fweimer@redhat.com>
+Date: Wed, 21 Apr 2021 11:50:43 +0200
+Subject: [PATCH 364/576] nptl_db: Support different libpthread/ld.so load
+ orders (bug 27744)
+
+libthread_db is loaded once GDB encounters libpthread, and at this
+point, ld.so may not have been processed by GDB yet. As a result,
+_rtld_global cannot be accessed by regular means from libthread_db.
+To make this work until GDB can be fixed, acess _rtld_global through
+a pointer stored in libpthread.
+
+The new test does not reproduce bug 27744 with
+--disable-hardcoded-path-in-tests, but is still a valid smoke test.
+With --enable-hardcoded-path-in-tests, it is necessary to avoid
+add-symbol-file because this can tickle a GDB bug.
+
+Fixes commit 1daccf403b1bd86370eb94edca794dc106d02039 ("nptl: Move
+stack list variables into _rtld_global").
+
+Tested-by: Emil Velikov <emil.velikov@collabora.com>
+---
+ nptl/Makefile                        |  19 +++-
+ nptl/pthread_create.c                |   8 ++
+ nptl/tst-pthread-gdb-attach-static.c |   1 +
+ nptl/tst-pthread-gdb-attach.c        | 143 +++++++++++++++++++++++++++
+ nptl_db/structs.def                  |   3 +-
+ nptl_db/td_init.c                    |  15 +--
+ nptl_db/thread_dbP.h                 |   2 +
+ 7 files changed, 180 insertions(+), 11 deletions(-)
+ create mode 100644 nptl/tst-pthread-gdb-attach-static.c
+ create mode 100644 nptl/tst-pthread-gdb-attach.c
+
+diff --git a/nptl/Makefile b/nptl/Makefile
+index 8fe92d43fa..e665d37e52 100644
+--- a/nptl/Makefile
++++ b/nptl/Makefile
+@@ -313,7 +313,8 @@ tests = tst-attr2 tst-attr3 tst-default-attr \
+ 	tst-thread-affinity-sched \
+ 	tst-pthread-defaultattr-free \
+ 	tst-pthread-attr-sigmask \
+-	tst-pthread-timedlock-lockloop
++	tst-pthread-timedlock-lockloop \
++	tst-pthread-gdb-attach tst-pthread-gdb-attach-static
+ 
+ tests-container =  tst-pthread-getattr
+ 
+@@ -359,6 +360,19 @@ CPPFLAGS-test-cond-printers.c := $(CFLAGS-printers-tests)
+ CPPFLAGS-test-rwlockattr-printers.c := $(CFLAGS-printers-tests)
+ CPPFLAGS-test-rwlock-printers.c := $(CFLAGS-printers-tests)
+ 
++# Reuse the CFLAGS setting for the GDB attaching test.  It needs
++# debugging information.
++CFLAGS-tst-pthread-gdb-attach.c := $(CFLAGS-printers-tests)
++CPPFLAGS-tst-pthread-gdb-attach.c := $(CFLAGS-printers-tests)
++ifeq ($(build-shared)$(build-hardcoded-path-in-tests),yesno)
++CPPFLAGS-tst-pthread-gdb-attach.c += -DDO_ADD_SYMBOL_FILE=1
++else
++CPPFLAGS-tst-pthread-gdb-attach.c += -DDO_ADD_SYMBOL_FILE=0
++endif
++CFLAGS-tst-pthread-gdb-attach-static.c := $(CFLAGS-printers-tests)
++CPPFLAGS-tst-pthread-gdb-attach-static.c := \
++  $(CFLAGS-printers-tests) -DDO_ADD_SYMBOL_FILE=0
++
+ ifeq ($(build-shared),yes)
+ tests-printers-libs := $(shared-thread-library)
+ else
+@@ -430,7 +444,8 @@ link-libc-static := $(common-objpfx)libc.a $(static-gnulib) \
+ tests-static += tst-stackguard1-static \
+ 		tst-cancel24-static \
+ 		tst-mutex8-static tst-mutexpi8-static tst-sem11-static \
+-		tst-sem12-static tst-cond11-static
++		tst-sem12-static tst-cond11-static \
++		tst-pthread-gdb-attach-static
+ 
+ tests += tst-cancel24-static
+ 
+diff --git a/nptl/pthread_create.c b/nptl/pthread_create.c
+index 6c645aff48..f13d8e44a4 100644
+--- a/nptl/pthread_create.c
++++ b/nptl/pthread_create.c
+@@ -51,6 +51,14 @@ static td_thr_events_t __nptl_threads_events __attribute_used__;
+ /* Pointer to descriptor with the last event.  */
+ static struct pthread *__nptl_last_event __attribute_used__;
+ 
++#ifdef SHARED
++/* This variable is used to access _rtld_global from libthread_db.  If
++   GDB loads libpthread before ld.so, it is not possible to resolve
++   _rtld_global directly during libpthread initialization.  */
++static struct rtld_global *__nptl_rtld_global __attribute_used__
++  = &_rtld_global;
++#endif
++
+ /* Number of threads running.  */
+ unsigned int __nptl_nthreads = 1;
+ 
+diff --git a/nptl/tst-pthread-gdb-attach-static.c b/nptl/tst-pthread-gdb-attach-static.c
+new file mode 100644
+index 0000000000..e159632cac
+--- /dev/null
++++ b/nptl/tst-pthread-gdb-attach-static.c
+@@ -0,0 +1 @@
++#include "tst-pthread-gdb-attach.c"
+diff --git a/nptl/tst-pthread-gdb-attach.c b/nptl/tst-pthread-gdb-attach.c
+new file mode 100644
+index 0000000000..0603ad844d
+--- /dev/null
++++ b/nptl/tst-pthread-gdb-attach.c
+@@ -0,0 +1,143 @@
++/* Smoke testing GDB process attach with thread-local variable access.
++   Copyright (C) 2021 Free Software Foundation, Inc.
++   This file is part of the GNU C Library.
++
++   The GNU C Library is free software; you can redistribute it and/or
++   modify it under the terms of the GNU Lesser General Public
++   License as published by the Free Software Foundation; either
++   version 2.1 of the License, or (at your option) any later version.
++
++   The GNU C Library 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
++   Lesser General Public License for more details.
++
++   You should have received a copy of the GNU Lesser General Public
++   License along with the GNU C Library; if not, see
++   <https://www.gnu.org/licenses/>.  */
++
++/* This test runs GDB against a forked copy of itself, to check
++   whether libthread_db can be loaded, and that access to thread-local
++   variables works.  */
++
++#include <errno.h>
++#include <stdlib.h>
++#include <support/check.h>
++#include <support/support.h>
++#include <support/temp_file.h>
++#include <support/test-driver.h>
++#include <support/xstdio.h>
++#include <support/xthread.h>
++#include <support/xunistd.h>
++#include <unistd.h>
++
++/* Starts out as zero, changed to 1 or 2 by the debugger, depending on
++   the thread.  */
++__thread volatile int altered_by_debugger;
++
++/* Writes the GDB script to run the test to PATH.  */
++static void
++write_gdbscript (const char *path, int tested_pid)
++{
++  FILE *fp = xfopen (path, "w");
++  fprintf (fp,
++           "set trace-commands on\n"
++           "set debug libthread-db 1\n"
++#if DO_ADD_SYMBOL_FILE
++           /* Do not do this unconditionally to work around a GDB
++              assertion failure: ../../gdb/symtab.c:6404:
++              internal-error: CORE_ADDR get_msymbol_address(objfile*,
++              const minimal_symbol*): Assertion `(objf->flags &
++              OBJF_MAINLINE) == 0' failed.  */
++           "add-symbol-file %1$s/nptl/tst-pthread-gdb-attach\n"
++#endif
++           "set auto-load safe-path %1$s/nptl_db\n"
++           "set libthread-db-search-path %1$s/nptl_db\n"
++           "attach %2$d\n",
++           support_objdir_root, tested_pid);
++  fputs ("break debugger_inspection_point\n"
++         "continue\n"
++         "thread 1\n"
++         "print altered_by_debugger\n"
++         "print altered_by_debugger = 1\n"
++         "thread 2\n"
++         "print altered_by_debugger\n"
++         "print altered_by_debugger = 2\n"
++         "continue\n",
++         fp);
++  xfclose (fp);
++}
++
++/* The test sets a breakpoint on this function and alters the
++   altered_by_debugger thread-local variable.  */
++void __attribute__ ((weak))
++debugger_inspection_point (void)
++{
++}
++
++/* Thread function for the test thread in the subprocess.  */
++static void *
++subprocess_thread (void *closure)
++{
++  /* Wait until altered_by_debugger changes the value away from 0.  */
++  while (altered_by_debugger == 0)
++    {
++      usleep (100 * 1000);
++      debugger_inspection_point ();
++    }
++
++  TEST_COMPARE (altered_by_debugger, 2);
++  return NULL;
++}
++
++/* This function implements the subprocess under test.  It creates a
++   second thread, waiting for its value to change to 2, and checks
++   that the main thread also changed its value to 1.  */
++static void
++in_subprocess (void)
++{
++  pthread_t thr = xpthread_create (NULL, subprocess_thread, NULL);
++  TEST_VERIFY (xpthread_join (thr) == NULL);
++  TEST_COMPARE (altered_by_debugger, 1);
++  _exit (0);
++}
++
++static int
++do_test (void)
++{
++  pid_t tested_pid = xfork ();
++  if (tested_pid == 0)
++    in_subprocess ();
++  char *tested_pid_string = xasprintf ("%d", tested_pid);
++
++  char *gdbscript;
++  xclose (create_temp_file ("tst-pthread-gdb-attach-", &gdbscript));
++  write_gdbscript (gdbscript, tested_pid);
++
++  pid_t gdb_pid = xfork ();
++  if (gdb_pid == 0)
++    {
++      clearenv ();
++      xdup2 (STDOUT_FILENO, STDERR_FILENO);
++      execlp ("gdb", "gdb", "-nx", "-batch", "-x", gdbscript, NULL);
++      if (errno == ENOENT)
++        _exit (EXIT_UNSUPPORTED);
++      else
++        _exit (1);
++    }
++
++  int status;
++  TEST_COMPARE (xwaitpid (gdb_pid, &status, 0), gdb_pid);
++  if (WIFEXITED (status) && WEXITSTATUS (status) == EXIT_UNSUPPORTED)
++    /* gdb is not installed.  */
++    return EXIT_UNSUPPORTED;
++  TEST_COMPARE (status, 0);
++  TEST_COMPARE (xwaitpid (tested_pid, &status, 0), tested_pid);
++  TEST_COMPARE (status, 0);
++
++  free (tested_pid_string);
++  free (gdbscript);
++  return 0;
++}
++
++#include <support/test-driver.c>
+diff --git a/nptl_db/structs.def b/nptl_db/structs.def
+index 999a9fc35a..8a613dd2f5 100644
+--- a/nptl_db/structs.def
++++ b/nptl_db/structs.def
+@@ -100,8 +100,7 @@ DB_STRUCT_FIELD (pthread, dtvp)
+ #endif
+ 
+ #if !(IS_IN (libpthread) && !defined SHARED)
+-DB_STRUCT (rtld_global)
+-DB_RTLD_VARIABLE (_rtld_global)
++DB_VARIABLE (__nptl_rtld_global)
+ #endif
+ DB_RTLD_GLOBAL_FIELD (dl_tls_dtv_slotinfo_list)
+ DB_RTLD_GLOBAL_FIELD (dl_stack_user)
+diff --git a/nptl_db/td_init.c b/nptl_db/td_init.c
+index 1d15681228..06b5adc5c2 100644
+--- a/nptl_db/td_init.c
++++ b/nptl_db/td_init.c
+@@ -33,13 +33,14 @@ td_init (void)
+ bool
+ __td_ta_rtld_global (td_thragent_t *ta)
+ {
+-  if (ta->ta_addr__rtld_global == 0
+-      && td_mod_lookup (ta->ph, LD_SO, SYM__rtld_global,
+-                        &ta->ta_addr__rtld_global) != PS_OK)
++  if (ta->ta_addr__rtld_global == 0)
+     {
+-      ta->ta_addr__rtld_global = (void*)-1;
+-      return false;
++      psaddr_t rtldglobalp;
++      if (DB_GET_VALUE (rtldglobalp, ta, __nptl_rtld_global, 0) == TD_OK)
++        ta->ta_addr__rtld_global = rtldglobalp;
++      else
++        ta->ta_addr__rtld_global = (void *) -1;
+     }
+-  else
+-    return ta->ta_addr__rtld_global != (void*)-1;
++
++  return ta->ta_addr__rtld_global != (void *)-1;
+ }
+diff --git a/nptl_db/thread_dbP.h b/nptl_db/thread_dbP.h
+index 580a70c471..712fa3aeb6 100644
+--- a/nptl_db/thread_dbP.h
++++ b/nptl_db/thread_dbP.h
+@@ -108,6 +108,8 @@ struct td_thragent
+ # undef DB_SYMBOL
+ # undef DB_VARIABLE
+ 
++  psaddr_t ta_addr__rtld_global;
++
+   /* The method of locating a thread's th_unique value.  */
+   enum
+     {
+-- 
+2.31.1
+