xref: /openbsd-src/regress/sys/kern/stackpivot/syscall/stackpivot.c (revision 802163a16b27f525fc2afe5dae956e57fc08dbe6)

/*
 * Copyright (c) 2018 Todd Mortimer <mortimer@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include "../pivot.h"

void doexit() {
    _exit(0);
}

int main() {
    /* set up an alt stack on the heap that just calls doexit */
    size_t *newstack = calloc(10, sizeof(size_t));
    printf("non-MAP_STACK stack at %p\n", newstack);
    newstack[0] = (size_t)doexit;
    pivot(newstack);
    return 0;
}