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/* Test the stack guard.
Copyright (C) 2000-2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#define _GNU_SOURCE
#include <pthread.h>
#include <assert.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <stdio.h>
size_t stacksize;
void *
thr (void *arg)
{
int i;
char *foo;
foo = alloca (3 * stacksize / 4);
for (i = 0; i < sizeof foo; i++)
foo[i] = -1;
return (void *) 1;
}
int
main (int argc, char *argv[])
{
error_t err;
pid_t child;
child = fork ();
switch (child)
{
case -1:
error (1, errno, "fork");
break;
case 0:
{
pthread_attr_t attr;
pthread_t tid;
void *ret;
err = pthread_attr_init (&attr);
assert_perror (err);
err = pthread_attr_getstacksize (&attr, &stacksize);
assert_perror (err);
err = pthread_attr_setguardsize (&attr, stacksize / 2);
if (err == ENOTSUP)
{
printf ("Stack guard attribute not supported.\n");
return 1;
}
assert_perror (err);
err = pthread_create (&tid, &attr, thr, 0);
assert_perror (err);
err = pthread_attr_destroy (&attr);
assert_perror (err);
err = pthread_join (tid, &ret);
/* Should never be successful. */
printf ("Thread did not segfault!?!\n");
assert_perror (err);
return 0;
}
default:
{
pid_t pid;
int status;
pid = waitpid (child, &status, 0);
printf ("pid = %d; child = %d; status = %d\n", pid, child, status);
assert (pid == child);
assert (status != 0);
}
}
return 0;
}
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