mmap_test.c revision 288465 
1/*-
2 * Copyright (c) 2009	Simon L. Nielsen <simon@FreeBSD.org>,
3 * 			Bjoern A. Zeeb <bz@FreeBSD.org>
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: stable/10/tests/sys/vm/mmap_test.c 288465 2015-10-01 22:08:16Z jhb $
27 */
28
29#include <sys/param.h>
30#include <sys/mman.h>
31#include <sys/sysctl.h>
32
33#include <atf-c.h>
34#include <errno.h>
35
36static const struct {
37	void	*addr;
38	int	ok[2];	/* Depending on security.bsd.map_at_zero {0, !=0}. */
39} map_at_zero_tests[] = {
40	{ (void *)0,			{ 0, 1 } }, /* Test sysctl. */
41	{ (void *)1,			{ 0, 0 } },
42	{ (void *)(PAGE_SIZE - 1),	{ 0, 0 } },
43	{ (void *)PAGE_SIZE,		{ 1, 1 } },
44	{ (void *)-1,			{ 0, 0 } },
45	{ (void *)(-PAGE_SIZE),		{ 0, 0 } },
46	{ (void *)(-1 - PAGE_SIZE),	{ 0, 0 } },
47	{ (void *)(-1 - PAGE_SIZE - 1),	{ 0, 0 } },
48	{ (void *)(0x1000 * PAGE_SIZE),	{ 1, 1 } },
49};
50
51#define	MAP_AT_ZERO	"security.bsd.map_at_zero"
52
53ATF_TC_WITHOUT_HEAD(mmap__map_at_zero);
54ATF_TC_BODY(mmap__map_at_zero, tc)
55{
56	void *p;
57	size_t len;
58	unsigned int i;
59	int map_at_zero;
60
61	len = sizeof(map_at_zero);
62	if (sysctlbyname(MAP_AT_ZERO, &map_at_zero, &len, NULL, 0) == -1) {
63		atf_tc_skip("sysctl for %s failed: %s\n", MAP_AT_ZERO,
64		    strerror(errno));
65		return;
66	}
67
68	/* Normalize to 0 or 1 for array access. */
69	map_at_zero = !!map_at_zero;
70
71	for (i = 0; i < nitems(map_at_zero_tests); i++) {
72		p = mmap((void *)map_at_zero_tests[i].addr, PAGE_SIZE,
73		    PROT_READ | PROT_WRITE | PROT_EXEC, MAP_ANON | MAP_FIXED,
74		    -1, 0);
75		if (p == MAP_FAILED) {
76			ATF_CHECK_MSG(map_at_zero_tests[i].ok[map_at_zero] == 0,
77			    "mmap(%p, ...) failed", map_at_zero_tests[i].addr);
78		} else {
79			ATF_CHECK_MSG(map_at_zero_tests[i].ok[map_at_zero] == 1,
80			    "mmap(%p, ...) succeeded: p=%p\n",
81			    map_at_zero_tests[i].addr, p);
82		}
83	}
84}
85
86ATF_TP_ADD_TCS(tp)
87{
88
89	ATF_TP_ADD_TC(tp, mmap__map_at_zero);
90
91	return (atf_no_error());
92}
93