1 /* $OpenBSD: ftruncate.c,v 1.1 2018/07/08 02:14:54 anton Exp $ */
2 /*
3 * Copyright (c) 2018 Anton Lindqvist <anton@openbsd.org>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18 /*
19 * Regression test for NULL-deref inside vn_writechk().
20 */
21
22 #include <err.h>
23 #include <fcntl.h>
24 #include <stdio.h>
25 #include <unistd.h>
26 #include <stdlib.h>
27
28 int
main(void)29 main(void)
30 {
31 const char *path = "/dev/bpf";
32 int fd;
33
34 fd = open(path, O_RDWR);
35 if (fd == -1)
36 err(1, "open: %s", path);
37 if (ftruncate(fd, 0) == -1)
38 err(1, "ftruncate");
39 close(fd);
40
41 return 0;
42 }
43