1 /*
2 * Copyright (c) 2016, Conrad Meyer
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 *
11 * 2. Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
25 * POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include <sys/param.h>
29 #include <sys/mman.h>
30
31 #include <err.h>
32 #include <stdint.h>
33 #include <stdlib.h>
34 #include <unistd.h>
35
36 /*
37 * This program is intended to create a bunch of segment mappings, then dump
38 * core.
39 */
40 int
main(int argc __unused,char ** argv __unused)41 main(int argc __unused, char **argv __unused)
42 {
43 void *v;
44 size_t i, pages, page_size;
45
46 page_size = getpagesize();
47 pages = UINT16_MAX + 1000;
48 v = mmap(NULL, pages * page_size, PROT_READ | PROT_WRITE,
49 MAP_ANON | MAP_PRIVATE, -1, 0);
50 if (v == NULL)
51 err(1, "mmap");
52 for (i = 0; i < pages; i += 2) {
53 /*
54 * Alternate protections to interleave RW and R PT_LOAD
55 * segments.
56 */
57 if (mprotect((char *)v + i * page_size, page_size,
58 PROT_READ) != 0)
59 err(1, "mprotect");
60 }
61
62 /* Dump core. */
63 abort();
64 }
65