glibc/debug/segfault.c
Paul Eggert 5a82c74822 Prefer https to http for gnu.org and fsf.org URLs
Also, change sources.redhat.com to sourceware.org.
This patch was automatically generated by running the following shell
script, which uses GNU sed, and which avoids modifying files imported
from upstream:

sed -ri '
  s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g
  s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g
' \
  $(find $(git ls-files) -prune -type f \
      ! -name '*.po' \
      ! -name 'ChangeLog*' \
      ! -path COPYING ! -path COPYING.LIB \
      ! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \
      ! -path manual/texinfo.tex ! -path scripts/config.guess \
      ! -path scripts/config.sub ! -path scripts/install-sh \
      ! -path scripts/mkinstalldirs ! -path scripts/move-if-change \
      ! -path INSTALL ! -path  locale/programs/charmap-kw.h \
      ! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \
      ! '(' -name configure \
            -execdir test -f configure.ac -o -f configure.in ';' ')' \
      ! '(' -name preconfigure \
            -execdir test -f preconfigure.ac ';' ')' \
      -print)

and then by running 'make dist-prepare' to regenerate files built
from the altered files, and then executing the following to cleanup:

  chmod a+x sysdeps/unix/sysv/linux/riscv/configure
  # Omit irrelevant whitespace and comment-only changes,
  # perhaps from a slightly-different Autoconf version.
  git checkout -f \
    sysdeps/csky/configure \
    sysdeps/hppa/configure \
    sysdeps/riscv/configure \
    sysdeps/unix/sysv/linux/csky/configure
  # Omit changes that caused a pre-commit check to fail like this:
  # remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines
  git checkout -f \
    sysdeps/powerpc/powerpc64/ppc-mcount.S \
    sysdeps/unix/sysv/linux/s390/s390-64/syscall.S
  # Omit change that caused a pre-commit check to fail like this:
  # remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline
  git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 02:43:31 -07:00

221 lines
5.8 KiB
C

/* Catch segmentation faults and print backtrace.
Copyright (C) 1998-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
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/>. */
#include <alloca.h>
#include <ctype.h>
#include <errno.h>
#include <execinfo.h>
#include <fcntl.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <_itoa.h>
#include <ldsodefs.h>
/* This file defines macros to access the content of the sigcontext element
passed up by the signal handler. */
#include <sigcontextinfo.h>
#ifdef SA_SIGINFO
# define SIGCONTEXT siginfo_t *info, void *
#endif
/* Get code to possibly dump the content of all registers. */
#include <register-dump.h>
/* We'll use this a lot. */
#define WRITE_STRING(s) write (fd, s, strlen (s))
/* Name of the output file. */
static const char *fname;
/* We better should not use `strerror' since it can call far too many
other functions which might fail. Do it here ourselves. */
static void
write_strsignal (int fd, int signal)
{
if (signal < 0 || signal >= _NSIG || _sys_siglist[signal] == NULL)
{
char buf[30];
char *ptr = _itoa_word (signal, &buf[sizeof (buf)], 10, 0);
WRITE_STRING ("signal ");
write (fd, buf, &buf[sizeof (buf)] - ptr);
}
else
WRITE_STRING (_sys_siglist[signal]);
}
/* This function is called when a segmentation fault is caught. The system
is in an unstable state now. This means especially that malloc() might
not work anymore. */
static void
catch_segfault (int signal, SIGCONTEXT ctx)
{
int fd, cnt, i;
void **arr;
struct sigaction sa;
uintptr_t pc;
/* This is the name of the file we are writing to. If none is given
or we cannot write to this file write to stderr. */
fd = 2;
if (fname != NULL)
{
fd = open (fname, O_TRUNC | O_WRONLY | O_CREAT, 0666);
if (fd == -1)
fd = 2;
}
WRITE_STRING ("*** ");
write_strsignal (fd, signal);
WRITE_STRING ("\n");
#ifdef REGISTER_DUMP
REGISTER_DUMP;
#endif
WRITE_STRING ("\nBacktrace:\n");
/* Get the backtrace. */
arr = alloca (256 * sizeof (void *));
cnt = backtrace (arr, 256);
/* Now try to locate the PC from signal context in the backtrace.
Normally it will be found at arr[2], but it might appear later
if there were some signal handler wrappers. Allow a few bytes
difference to cope with as many arches as possible. */
pc = sigcontext_get_pc (ctx);
for (i = 0; i < cnt; ++i)
if ((uintptr_t) arr[i] >= pc - 16 && (uintptr_t) arr[i] <= pc + 16)
break;
/* If we haven't found it, better dump full backtrace even including
the signal handler frames instead of not dumping anything. */
if (i == cnt)
i = 0;
/* Now generate nicely formatted output. */
__backtrace_symbols_fd (arr + i, cnt - i, fd);
#ifdef HAVE_PROC_SELF
/* Now the link map. */
int mapfd = open ("/proc/self/maps", O_RDONLY);
if (mapfd != -1)
{
write (fd, "\nMemory map:\n\n", 14);
char buf[256];
ssize_t n;
while ((n = TEMP_FAILURE_RETRY (read (mapfd, buf, sizeof (buf)))) > 0)
TEMP_FAILURE_RETRY (write (fd, buf, n));
close (mapfd);
}
#endif
/* Pass on the signal (so that a core file is produced). */
sa.sa_handler = SIG_DFL;
sigemptyset (&sa.sa_mask);
sa.sa_flags = 0;
sigaction (signal, &sa, NULL);
raise (signal);
}
static void
__attribute__ ((constructor))
install_handler (void)
{
struct sigaction sa;
const char *sigs = getenv ("SEGFAULT_SIGNALS");
const char *name;
#ifdef SA_SIGINFO
sa.sa_sigaction = catch_segfault;
sa.sa_flags = SA_SIGINFO;
#else
sa.sa_handler = (void*) catch_segfault;
sa.sa_flags = 0;
#endif
sigemptyset (&sa.sa_mask);
sa.sa_flags |= SA_RESTART;
/* Maybe we are expected to use an alternative stack. */
if (getenv ("SEGFAULT_USE_ALTSTACK") != 0)
{
void *stack_mem = malloc (2 * SIGSTKSZ);
stack_t ss;
if (stack_mem != NULL)
{
ss.ss_sp = stack_mem;
ss.ss_flags = 0;
ss.ss_size = 2 * SIGSTKSZ;
if (sigaltstack (&ss, NULL) == 0)
sa.sa_flags |= SA_ONSTACK;
}
}
if (sigs == NULL)
sigaction (SIGSEGV, &sa, NULL);
else if (sigs[0] == '\0')
/* Do not do anything. */
return;
else
{
const char *where;
int all = __strcasecmp (sigs, "all") == 0;
#define INSTALL_FOR_SIG(sig, name) \
where = __strcasestr (sigs, name); \
if (all || (where != NULL \
&& (where == sigs || !isalnum (where[-1])) \
&& !isalnum (where[sizeof (name) - 1]))) \
sigaction (sig, &sa, NULL);
INSTALL_FOR_SIG (SIGSEGV, "segv");
INSTALL_FOR_SIG (SIGILL, "ill");
#ifdef SIGBUS
INSTALL_FOR_SIG (SIGBUS, "bus");
#endif
#ifdef SIGSTKFLT
INSTALL_FOR_SIG (SIGSTKFLT, "stkflt");
#endif
INSTALL_FOR_SIG (SIGABRT, "abrt");
INSTALL_FOR_SIG (SIGFPE, "fpe");
}
/* Preserve the output file name if there is any given. */
name = getenv ("SEGFAULT_OUTPUT_NAME");
if (name != NULL && name[0] != '\0')
{
int ret = access (name, R_OK | W_OK);
if (ret == 0 || (ret == -1 && errno == ENOENT))
fname = __strdup (name);
}
}