mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-24 05:50:14 +00:00
9556acd249
Checked on aarch64, armhf, x86_64, and i686. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
84 lines
2.1 KiB
C
84 lines
2.1 KiB
C
/* Make sure longjmp fortification catches bad signal stacks.
|
|
Copyright (C) 2013-2023 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/>. */
|
|
|
|
#include <setjmp.h>
|
|
#include <signal.h>
|
|
#include <string.h>
|
|
|
|
static char buf[SIGSTKSZ * 4];
|
|
static jmp_buf jb;
|
|
|
|
static void
|
|
handler (int sig)
|
|
{
|
|
if (sig == SIGUSR1)
|
|
{
|
|
if (setjmp (jb) != 0)
|
|
{
|
|
puts ("setjmp should not have been called");
|
|
kill (getpid (), SIGTERM);
|
|
}
|
|
}
|
|
else if (sig == SIGABRT)
|
|
{
|
|
/* Yeah it worked. */
|
|
_exit (0);
|
|
}
|
|
}
|
|
|
|
static int
|
|
do_test (void)
|
|
{
|
|
stack_t ss;
|
|
|
|
set_fortify_handler (handler);
|
|
|
|
/* Create a valid signal stack and enable it. */
|
|
ss.ss_sp = buf;
|
|
ss.ss_size = sizeof (buf);
|
|
ss.ss_flags = 0;
|
|
if (sigaltstack (&ss, NULL) < 0)
|
|
{
|
|
printf ("first sigaltstack failed: %m\n");
|
|
return 1;
|
|
}
|
|
|
|
/* Trigger the signal handler which will create a jmpbuf that points to the
|
|
end of the signal stack. */
|
|
signal (SIGUSR1, handler);
|
|
kill (getpid (), SIGUSR1);
|
|
|
|
/* Shrink the signal stack so the jmpbuf is now invalid.
|
|
We adjust the start & end to handle stacks that grow up & down. */
|
|
ss.ss_sp = buf + sizeof (buf) / 2;
|
|
ss.ss_size = sizeof (buf) / 4;
|
|
if (sigaltstack (&ss, NULL) < 0)
|
|
{
|
|
printf ("second sigaltstack failed: %m\n");
|
|
return 1;
|
|
}
|
|
|
|
/* This should fail. */
|
|
longjmp (jb, 1);
|
|
|
|
puts ("longjmp returned and shouldn't");
|
|
return 1;
|
|
}
|
|
|
|
#include <support/test-driver.c>
|