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Use mmap for allocation of buffers used for __abort_msg

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This commit is contained in:
Ulrich Drepper
2011-05-15 00:34:48 -04:00
parent fc317541ab
commit f8a3b5bf8f
9 changed files with 131 additions and 95 deletions
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33
sysdeps/posix/libc_fatal.c
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@ -1,4 +1,4 @@
/* Copyright (C) 1993-1995,1997,2000,2004,2005,2009
/* Copyright (C) 1993-1995,1997,2000,2004,2005,2009,2011
Free Software Foundation, Inc.
This file is part of the GNU C Library.
@ -20,6 +20,7 @@
#include <atomic.h>
#include <errno.h>
#include <fcntl.h>
#include <ldsodefs.h>
#include <paths.h>
#include <stdarg.h>
#include <stdbool.h>
@ -125,18 +126,28 @@ __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)
if (do_abort)
{
char *wp = buf;
for (int cnt = 0; cnt < nlist; ++cnt)
wp = mempcpy (wp, iov[cnt].iov_base, iov[cnt].iov_len);
*wp = '\0';
total = ((total + 1 + GLRO(dl_pagesize) - 1)
& ~(GLRO(dl_pagesize) - 1));
struct abort_msg_s *buf = __mmap (NULL, total,
PROT_READ | PROT_WRITE,
MAP_ANON | MAP_PRIVATE, -1, 0);
if (buf != MAP_FAILED)
{
buf->size = total;
char *wp = buf->msg;
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);
/* We have to free the old buffer since the application might
catch the SIGABRT signal. */
struct abort_msg_s *old = atomic_exchange_acq (&__abort_msg,
buf);
if (old != NULL)
__munmap (old, old->size);
}
}
}