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x86/cet: Update tst-cet-vfork-1

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Change tst-cet-vfork-1.c to verify that vfork child return triggers
SIGSEGV due to shadow stack mismatch.
This commit is contained in:
H.J. Lu 2022-01-16 12:09:57 -08:00
parent 980450f126
commit 1a23b39f9d
1 changed files with 17 additions and 26 deletions
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39
sysdeps/unix/sysv/linux/x86/tst-cet-vfork-1.c
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@ -18,34 +18,26 @@
<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);
}
/* NB: Since child return pops shadow stack which is shared with
parent, child must not return after vfork. */
if ((p1 = vfork ()) == 0)
{
pid_t p = getpid ();
TEMP_FAILURE_RETRY (write (fd[1], &p, sizeof (p)));
/* Child return should trigger SIGSEGV. */
/* Child return should trigger SIGSEGV due to shadow stack
mismatch. */
return;
}
else if (p1 == -1)
@ -54,22 +46,22 @@ do_test_1 (void)
_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");
_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 isn't in use. */
_exit (EXIT_FAILURE);
SIGSEGV when shadow stack is in use. */
_exit (EXIT_SUCCESS);
}
static int
@ -80,9 +72,8 @@ do_test (void)
return EXIT_UNSUPPORTED;
do_test_1 ();
/* Child exits immediately so that child returns without triggering
SIGSEGV when shadow stack isn't in use. */
SIGSEGV when shadow stack is in use. */
_exit (EXIT_FAILURE);
}
#define EXPECTED_SIGNAL (_get_ssp () == 0 ? 0 : SIGSEGV)
#include <support/test-driver.c>