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  * $FreeBSD$
28  */
29 
30 #include <sys/param.h>
31 #include <sys/mman.h>
32 
33 #include <err.h>
34 #include <stdint.h>
35 #include <stdlib.h>
36 
37 /*
38  * This program is intended to create a bunch of segment mappings, then dump
39  * core.
40  */
41 int
42 main(int argc __unused, char **argv __unused)
43 {
44 	void *v;
45 	unsigned i;
46 
47 	for (i = 0; i < UINT16_MAX + 1000; i++) {
48 		/*
49 		 * Alternate protections; otherwise the kernel will just extend
50 		 * the adjacent same-protection previous mapping.
51 		 */
52 		v = mmap(NULL, PAGE_SIZE,
53 		    (((i % 2) == 0) ? PROT_READ : 0) | PROT_WRITE,
54 		    MAP_ANON | MAP_PRIVATE, -1, 0);
55 		if (v == MAP_FAILED)
56 			err(1, "mmap");
57 	}
58 
59 	/* Dump core. */
60 	abort();
61 }
62