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 #include <unistd.h>
37 
38 /*
39  * This program is intended to create a bunch of segment mappings, then dump
40  * core.
41  */
42 int
43 main(int argc __unused, char **argv __unused)
44 {
45 	void *v;
46 	size_t i, pages, page_size;
47 
48 	page_size = getpagesize();
49 	pages = UINT16_MAX + 1000;
50 	v = mmap(NULL, pages * page_size, PROT_READ | PROT_WRITE,
51 	    MAP_ANON | MAP_PRIVATE, -1, 0);
52 	if (v == NULL)
53 		err(1, "mmap");
54 	for (i = 0; i < pages; i += 2) {
55 		/*
56 		 * Alternate protections to interleave RW and R PT_LOAD
57 		 * segments.
58 		 */
59 		if (mprotect((char *)v + i * page_size, page_size,
60 		    PROT_READ) != 0)
61 			err(1, "mprotect");
62 	}
63 
64 	/* Dump core. */
65 	abort();
66 }
67