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86 lines
2.2 KiB
C
86 lines
2.2 KiB
C
/* Make sure longjmp fortification catches bad signal stacks.
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Copyright (C) 2013-2020 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 <setjmp.h>
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#include <signal.h>
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#include <string.h>
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static int do_test (void);
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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static char buf[SIGSTKSZ * 4];
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static jmp_buf jb;
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static void
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handler (int sig)
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{
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if (sig == SIGUSR1)
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{
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if (setjmp (jb) != 0)
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{
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puts ("setjmp should not have been called");
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kill (getpid (), SIGTERM);
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}
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}
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else if (sig == SIGABRT)
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{
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/* Yeah it worked. */
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_exit (0);
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}
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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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stack_t ss;
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set_fortify_handler (handler);
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/* Create a valid signal stack and enable it. */
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ss.ss_sp = buf;
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ss.ss_size = sizeof (buf);
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ss.ss_flags = 0;
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if (sigaltstack (&ss, NULL) < 0)
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{
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printf ("first sigaltstack failed: %m\n");
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return 1;
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}
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/* Trigger the signal handler which will create a jmpbuf that points to the
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end of the signal stack. */
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signal (SIGUSR1, handler);
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kill (getpid (), SIGUSR1);
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/* Shrink the signal stack so the jmpbuf is now invalid.
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We adjust the start & end to handle stacks that grow up & down. */
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ss.ss_sp = buf + sizeof (buf) / 2;
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ss.ss_size = sizeof (buf) / 4;
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if (sigaltstack (&ss, NULL) < 0)
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{
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printf ("second sigaltstack failed: %m\n");
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return 1;
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}
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/* This should fail. */
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longjmp (jb, 1);
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puts ("longjmp returned and shouldn't");
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return 1;
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}
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