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103 lines
2.1 KiB
C
103 lines
2.1 KiB
C
/* Test the stack guard.
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Copyright (C) 2000-2023 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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#define _GNU_SOURCE
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#include <pthread.h>
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#include <assert.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <stdio.h>
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size_t stacksize;
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void *
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thr (void *arg)
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{
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int i;
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char *foo;
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foo = alloca (3 * stacksize / 4);
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for (i = 0; i < sizeof foo; i++)
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foo[i] = -1;
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return (void *) 1;
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}
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int
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main (int argc, char *argv[])
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{
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error_t err;
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pid_t child;
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child = fork ();
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switch (child)
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{
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case -1:
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error (1, errno, "fork");
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break;
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case 0:
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{
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pthread_attr_t attr;
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pthread_t tid;
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void *ret;
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err = pthread_attr_init (&attr);
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assert_perror (err);
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err = pthread_attr_getstacksize (&attr, &stacksize);
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assert_perror (err);
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err = pthread_attr_setguardsize (&attr, stacksize / 2);
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if (err == ENOTSUP)
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{
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printf ("Stack guard attribute not supported.\n");
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return 1;
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}
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assert_perror (err);
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err = pthread_create (&tid, &attr, thr, 0);
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assert_perror (err);
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err = pthread_attr_destroy (&attr);
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assert_perror (err);
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err = pthread_join (tid, &ret);
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/* Should never be successful. */
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printf ("Thread did not segfault!?!\n");
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assert_perror (err);
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return 0;
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}
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default:
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{
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pid_t pid;
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int status;
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pid = waitpid (child, &status, 0);
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printf ("pid = %d; child = %d; status = %d\n", pid, child, status);
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assert (pid == child);
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assert (status != 0);
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}
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}
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return 0;
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}
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