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/* Verify that child of the vfork-calling function can't return when
shadow stack is in use.
Copyright (C) 2020-2024 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 <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <x86intrin.h>
#include <support/test-driver.h>
__attribute__ ((noclone, noinline))
static void
do_test_1 (void)
{
pid_t p1;
/* NB: Since child return pops shadow stack which is shared with
parent, child must not return after vfork. */
if ((p1 = vfork ()) == 0)
{
/* Child return should trigger SIGSEGV due to shadow stack
mismatch. */
return;
}
else if (p1 == -1)
{
puts ("vfork failed");
_exit (EXIT_FAILURE);
}
int r;
if (TEMP_FAILURE_RETRY (waitpid (p1, &r, 0)) != p1)
{
puts ("waitpid failed");
_exit (EXIT_FAILURE);
}
if (!WIFSIGNALED (r) || WTERMSIG (r) != SIGSEGV)
{
puts ("Child not terminated with SIGSEGV");
_exit (EXIT_FAILURE);
}
/* Parent exits immediately so that parent returns without triggering
SIGSEGV when shadow stack is in use. */
_exit (EXIT_SUCCESS);
}
static int
do_test (void)
{
/* NB: This test should trigger SIGSEGV with shadow stack enabled. */
if (_get_ssp () == 0)
return EXIT_UNSUPPORTED;
do_test_1 ();
/* Child exits immediately so that child returns without triggering
SIGSEGV when shadow stack is in use. */
_exit (EXIT_FAILURE);
}
#include <support/test-driver.c>
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