mmap_test.c revision 288466 
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 288466 2015-10-01 22:17:27Z 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#include <fcntl.h>
36#include <stdarg.h>
37#include <stdio.h>
38#include <stdlib.h>
39
40static const struct {
41	void	*addr;
42	int	ok[2];	/* Depending on security.bsd.map_at_zero {0, !=0}. */
43} map_at_zero_tests[] = {
44	{ (void *)0,			{ 0, 1 } }, /* Test sysctl. */
45	{ (void *)1,			{ 0, 0 } },
46	{ (void *)(PAGE_SIZE - 1),	{ 0, 0 } },
47	{ (void *)PAGE_SIZE,		{ 1, 1 } },
48	{ (void *)-1,			{ 0, 0 } },
49	{ (void *)(-PAGE_SIZE),		{ 0, 0 } },
50	{ (void *)(-1 - PAGE_SIZE),	{ 0, 0 } },
51	{ (void *)(-1 - PAGE_SIZE - 1),	{ 0, 0 } },
52	{ (void *)(0x1000 * PAGE_SIZE),	{ 1, 1 } },
53};
54
55#define	MAP_AT_ZERO	"security.bsd.map_at_zero"
56
57ATF_TC_WITHOUT_HEAD(mmap__map_at_zero);
58ATF_TC_BODY(mmap__map_at_zero, tc)
59{
60	void *p;
61	size_t len;
62	unsigned int i;
63	int map_at_zero;
64
65	len = sizeof(map_at_zero);
66	if (sysctlbyname(MAP_AT_ZERO, &map_at_zero, &len, NULL, 0) == -1) {
67		atf_tc_skip("sysctl for %s failed: %s\n", MAP_AT_ZERO,
68		    strerror(errno));
69		return;
70	}
71
72	/* Normalize to 0 or 1 for array access. */
73	map_at_zero = !!map_at_zero;
74
75	for (i = 0; i < nitems(map_at_zero_tests); i++) {
76		p = mmap((void *)map_at_zero_tests[i].addr, PAGE_SIZE,
77		    PROT_READ | PROT_WRITE | PROT_EXEC, MAP_ANON | MAP_FIXED,
78		    -1, 0);
79		if (p == MAP_FAILED) {
80			ATF_CHECK_MSG(map_at_zero_tests[i].ok[map_at_zero] == 0,
81			    "mmap(%p, ...) failed", map_at_zero_tests[i].addr);
82		} else {
83			ATF_CHECK_MSG(map_at_zero_tests[i].ok[map_at_zero] == 1,
84			    "mmap(%p, ...) succeeded: p=%p\n",
85			    map_at_zero_tests[i].addr, p);
86		}
87	}
88}
89
90static void
91checked_mmap(int prot, int flags, int fd, int error, const char *msg)
92{
93	void *p;
94
95	p = mmap(NULL, getpagesize(), prot, flags, fd, 0);
96	if (p == MAP_FAILED) {
97		if (error == 0)
98			ATF_CHECK_MSG(0, "%s failed with errno %d", msg,
99			    errno);
100		else
101			ATF_CHECK_EQ_MSG(error, errno,
102			    "%s failed with wrong errno %d (expected %d)", msg,
103			    errno, error);
104	} else {
105		ATF_CHECK_MSG(error == 0, "%s succeeded", msg);
106		munmap(p, getpagesize());
107	}
108}
109
110ATF_TC_WITHOUT_HEAD(mmap__bad_arguments);
111ATF_TC_BODY(mmap__bad_arguments, tc)
112{
113	int fd;
114
115	ATF_REQUIRE((fd = shm_open(SHM_ANON, O_RDWR, 0644)) >= 0);
116	ATF_REQUIRE(ftruncate(fd, getpagesize()) == 0);
117
118	/* These should work. */
119	checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON, -1, 0,
120	    "simple MAP_ANON");
121	checked_mmap(PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0,
122	    "simple shm fd shared");
123	checked_mmap(PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0,
124	    "simple shm fd private");
125
126#if 0
127	/*
128	 * These tests do not fail without r271635 and followup fixes.
129	 * Those changes will not be merged to stable/10 since they
130	 * are potentially disruptive.
131	 */
132
133	/* Extra PROT flags. */
134	checked_mmap(PROT_READ | PROT_WRITE | 0x100000, MAP_ANON, -1, EINVAL,
135	    "MAP_ANON with extra PROT flags");
136	checked_mmap(0xffff, MAP_SHARED, fd, EINVAL,
137	    "shm fd with garbage PROT");
138
139	/* Undefined flag. */
140	checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON | MAP_RESERVED0080, -1,
141	    EINVAL, "Undefined flag");
142
143	/* Both MAP_SHARED and MAP_PRIVATE */
144	checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE |
145	    MAP_SHARED, -1, EINVAL, "MAP_ANON with both SHARED and PRIVATE");
146	checked_mmap(PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_SHARED, fd,
147	    EINVAL, "shm fd with both SHARED and PRIVATE");
148
149	/* At least one of MAP_SHARED or MAP_PRIVATE without ANON */
150	checked_mmap(PROT_READ | PROT_WRITE, 0, fd, EINVAL,
151	    "shm fd without sharing flag");
152#endif
153
154	/* MAP_ANON with either sharing flag (impacts fork). */
155	checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON | MAP_SHARED, -1, 0,
156	    "shared MAP_ANON");
157	checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0,
158	    "private MAP_ANON");
159
160	/* MAP_ANON should require an fd of -1. */
161	checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, 0, EINVAL,
162	    "MAP_ANON with fd != -1");
163}
164
165ATF_TP_ADD_TCS(tp)
166{
167
168	ATF_TP_ADD_TC(tp, mmap__map_at_zero);
169	ATF_TP_ADD_TC(tp, mmap__bad_arguments);
170
171	return (atf_no_error());
172}
173