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/* Verify that child of the vfork-calling function can't return when
shadow stack is in use.
Copyright (C) 2020-2021 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 <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <x86intrin.h>
#include <support/test-driver.h>
#include <support/xsignal.h>
#include <support/xunistd.h>
__attribute__ ((noclone, noinline))
static void
do_test_1 (void)
{
pid_t p1;
int fd[2];
if (pipe (fd) == -1)
{
puts ("pipe failed");
_exit (EXIT_FAILURE);
}
if ((p1 = vfork ()) == 0)
{
pid_t p = getpid ();
TEMP_FAILURE_RETRY (write (fd[1], &p, sizeof (p)));
/* Child return should trigger SIGSEGV. */
return;
}
else if (p1 == -1)
{
puts ("vfork failed");
_exit (EXIT_FAILURE);
}
pid_t p2 = 0;
if (TEMP_FAILURE_RETRY (read (fd[0], &p2, sizeof (pid_t)))
!= sizeof (pid_t))
puts ("pipd read failed");
else
{
int r;
if (TEMP_FAILURE_RETRY (waitpid (p1, &r, 0)) != p1)
puts ("waitpid failed");
else if (r != 0)
puts ("pip write in child failed");
}
/* Parent exits immediately so that parent returns without triggering
SIGSEGV when shadow stack isn't in use. */
_exit (EXIT_FAILURE);
}
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 isn't in use. */
_exit (EXIT_FAILURE);
}
#define EXPECTED_SIGNAL (_get_ssp () == 0 ? 0 : SIGSEGV)
#include <support/test-driver.c>
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