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89 lines
2.4 KiB
C
89 lines
2.4 KiB
C
/* Verify that child of the vfork-calling function can't return when
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shadow stack is in use.
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Copyright (C) 2020-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <x86intrin.h>
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#include <support/test-driver.h>
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#include <support/xsignal.h>
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#include <support/xunistd.h>
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__attribute__ ((noclone, noinline))
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static void
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do_test_1 (void)
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{
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pid_t p1;
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int fd[2];
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if (pipe (fd) == -1)
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{
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puts ("pipe failed");
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_exit (EXIT_FAILURE);
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}
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if ((p1 = vfork ()) == 0)
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{
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pid_t p = getpid ();
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TEMP_FAILURE_RETRY (write (fd[1], &p, sizeof (p)));
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/* Child return should trigger SIGSEGV. */
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return;
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}
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else if (p1 == -1)
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{
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puts ("vfork failed");
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_exit (EXIT_FAILURE);
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}
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pid_t p2 = 0;
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if (TEMP_FAILURE_RETRY (read (fd[0], &p2, sizeof (pid_t)))
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!= sizeof (pid_t))
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puts ("pipd read failed");
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else
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{
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int r;
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if (TEMP_FAILURE_RETRY (waitpid (p1, &r, 0)) != p1)
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puts ("waitpid failed");
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else if (r != 0)
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puts ("pip write in child failed");
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}
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/* Parent exits immediately so that parent returns without triggering
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SIGSEGV when shadow stack isn't in use. */
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_exit (EXIT_FAILURE);
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}
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static int
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do_test (void)
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{
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/* NB: This test should trigger SIGSEGV with shadow stack enabled. */
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if (_get_ssp () == 0)
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return EXIT_UNSUPPORTED;
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do_test_1 ();
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/* Child exits immediately so that child returns without triggering
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SIGSEGV when shadow stack isn't in use. */
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_exit (EXIT_FAILURE);
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}
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#define EXPECTED_SIGNAL (_get_ssp () == 0 ? 0 : SIGSEGV)
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#include <support/test-driver.c>
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