1 /* Make sure longjmp fortification catches bad signal stacks.
2 Copyright (C) 2013-2024 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
23 static char buf[SIGSTKSZ * 4];
33 puts ("setjmp should not have been called");
34 kill (getpid (), SIGTERM);
37 else if (sig == SIGABRT)
49 set_fortify_handler (handler);
51 /* Create a valid signal stack and enable it. */
53 ss.ss_size = sizeof (buf);
55 if (sigaltstack (&ss, NULL) < 0)
57 printf ("first sigaltstack failed: %m\n");
61 /* Trigger the signal handler which will create a jmpbuf that points to the
62 end of the signal stack. */
63 signal (SIGUSR1, handler);
64 kill (getpid (), SIGUSR1);
66 /* Shrink the signal stack so the jmpbuf is now invalid.
67 We adjust the start & end to handle stacks that grow up & down. */
68 ss.ss_sp = buf + sizeof (buf) / 2;
69 ss.ss_size = sizeof (buf) / 4;
70 if (sigaltstack (&ss, NULL) < 0)
72 printf ("second sigaltstack failed: %m\n");
76 /* This should fail. */
79 puts ("longjmp returned and shouldn't");
83 #include <support/test-driver.c>