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Preserve message printed before abort.

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The terminal output etc is not visible in a core file.  The new
libc-internal variable __abort_msg will point to a string with the
message which has been printed before the abort in case abort is
called from inside libc.  BZ #10217
This commit is contained in:
Ulrich Drepper 2009-06-15 16:17:09 -07:00
parent 6355c99740
commit 48dcd0ba84
8 changed files with 67 additions and 11 deletions
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11
ChangeLog
View File

@ -1,5 +1,16 @@
2009-06-15 Ulrich Drepper <drepper@redhat.com>
[BZ #10217]
* stdlib/abort.c: Define variable __abort_msg.
* stdlib/Versions: Export __abort_msg with GLIBC_PRIVATE version.
* include/stdlib.h: Declare __abort_msg.
* assert/assert-perr.c: Don't free buffer for message immediately.
Store atomically in __abort_msg and free old buffer if necessary.
* assert/assert.c: Likewise.
* sysdeps/posix/libc_fatal.c: Allocate buffer for message, copy it,
store pointer in __abort_msg, and possibly free old string.
* sysdeps/unix/sysv/linux/libc_fatal.c: Likewise.
* time/tzfile.c (__tzfile_read): Correct computation of tzspec_len.
[BZ #10211]

10
assert/assert-perr.c
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@ -1,4 +1,4 @@
/* Copyright (C) 1994-1998,2001,2002,2005 Free Software Foundation, Inc.
/* Copyright (C) 1994-1998,2001,2002,2005,2009 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
@ -17,6 +17,7 @@
02111-1307 USA. */
#include <assert.h>
#include <atomic.h>
#include <libintl.h>
#include <stdio.h>
#include <stdlib.h>
@ -64,9 +65,10 @@ __assert_perror_fail (int errnum,
(void) __fxprintf (NULL, "%s", buf);
(void) fflush (stderr);
/* We have to free the buffer since the appplication might catch the
SIGABRT. */
free (buf);
/* We have to free the old buffer since the application might
catch the SIGABRT signal. */
char *old = atomic_exchange_acq (&__abort_msg, buf);
free (old);
}
else
{

11
assert/assert.c
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@ -1,4 +1,4 @@
/* Copyright (C) 1991,1994-1996,1998,2001,2002,2005
/* Copyright (C) 1991,1994-1996,1998,2001,2002,2005,2009
Free Software Foundation, Inc.
This file is part of the GNU C Library.
@ -18,6 +18,7 @@
02111-1307 USA. */
#include <assert.h>
#include <atomic.h>
#include <libintl.h>
#include <stdio.h>
#include <stdlib.h>
@ -43,6 +44,7 @@ extern const char *__progname;
# include FATAL_PREPARE_INCLUDE
#endif
#undef __assert_fail
void
__assert_fail (const char *assertion, const char *file, unsigned int line,
@ -64,9 +66,10 @@ __assert_fail (const char *assertion, const char *file, unsigned int line,
(void) __fxprintf (NULL, "%s", buf);
(void) fflush (stderr);
/* We have to free the buffer since the application might catch the
SIGABRT. */
free (buf);
/* We have to free the old buffer since the application might
catch the SIGABRT signal. */
char *old = atomic_exchange_acq (&__abort_msg, buf);
free (old);
}
else
{

3
include/stdlib.h
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@ -221,6 +221,9 @@ extern int __qfcvt_r (long double __value, int __ndigit,
extern void *__default_morecore (ptrdiff_t) __THROW;
libc_hidden_proto (__default_morecore)
extern char *__abort_msg;
libc_hidden_proto (__abort_msg)
__END_DECLS
#undef __Need_M_And_C

2
stdlib/Versions
View File

@ -104,5 +104,7 @@ libc {
# functions which have an additional interface since they are
# are cancelable.
__libc_system;
# Variable which needs a dynamic symbol table entry.
__abort_msg;
}
}

6
stdlib/abort.c
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@ -1,4 +1,4 @@
/* Copyright (C) 1991,93,95,96,97,98,2001,02 Free Software Foundation, Inc.
/* Copyright (C) 1991,93,1995-1998,2001,02,2009 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
@ -36,6 +36,10 @@
# define fflush(s) _IO_flush_all_lockp (0)
#endif
/* Exported variable to locate abort message in core files etc. */
char *__abort_msg __attribute__ ((nocommon));
libc_hidden_def (__abort_msg)
/* We must avoid to run in circles. Therefore we remember how far we
already got. */
static int stage;

17
sysdeps/posix/libc_fatal.c
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@ -1,4 +1,4 @@
/* Copyright (C) 1993,1994,1995,1997,2000,2004,2005
/* Copyright (C) 1993-1995,1997,2000,2004,2005,2009
Free Software Foundation, Inc.
This file is part of the GNU C Library.
@ -17,6 +17,7 @@
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <atomic.h>
#include <errno.h>
#include <fcntl.h>
#include <paths.h>
@ -123,6 +124,20 @@ __libc_message (int do_abort, const char *fmt, ...)
if (TEMP_FAILURE_RETRY (__writev (fd, iov, nlist)) == total)
written = true;
char *buf = do_abort ? malloc (total + 1) : NULL;
if (buf != NULL)
{
char *wp = buf;
for (int cnt = 0; cnt < nlist; ++cnt)
wp = mempcpy (wp, iov[cnt].iov_base, iov[cnt].iov_len);
*wp = '\0';
/* We have to free the old buffer since the application might
catch the SIGABRT signal. */
char *old = atomic_exchange_acq (&__abort_msg, buf);
free (old);
}
}
va_end (ap);

18
sysdeps/unix/sysv/linux/libc_fatal.c
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@ -1,4 +1,5 @@
/* Copyright (C) 1993-1995,1997,2000,2002-2005 Free Software Foundation, Inc.
/* Copyright (C) 1993-1995,1997,2000,2002-2005,2009
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
@ -16,6 +17,7 @@
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <atomic.h>
#include <errno.h>
#include <fcntl.h>
#include <paths.h>
@ -131,6 +133,20 @@ __libc_message (int do_abort, const char *fmt, ...)
if (cnt == total)
written = true;
char *buf = do_abort ? malloc (total + 1) : NULL;
if (buf != NULL)
{
char *wp = buf;
for (int cnt = 0; cnt < nlist; ++cnt)
wp = mempcpy (wp, iov[cnt].iov_base, iov[cnt].iov_len);
*wp = '\0';
/* We have to free the old buffer since the application might
catch the SIGABRT signal. */
char *old = atomic_exchange_acq (&__abort_msg, buf);
free (old);
}
}
va_end (ap);