mmap_test.c revision 288467 
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 288467 2015-10-01 22:19:41Z 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 devstatfd, shmfd, zerofd;
114
115	ATF_REQUIRE((devstatfd = open("/dev/devstat", O_RDONLY)) >= 0);
116	ATF_REQUIRE((shmfd = shm_open(SHM_ANON, O_RDWR, 0644)) >= 0);
117	ATF_REQUIRE(ftruncate(shmfd, getpagesize()) == 0);
118	ATF_REQUIRE((zerofd = open("/dev/zero", O_RDONLY)) >= 0);
119
120	/* These should work. */
121	checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON, -1, 0,
122	    "simple MAP_ANON");
123	checked_mmap(PROT_READ | PROT_WRITE, MAP_SHARED, shmfd, 0,
124	    "simple shm fd shared");
125	checked_mmap(PROT_READ | PROT_WRITE, MAP_PRIVATE, shmfd, 0,
126	    "simple shm fd private");
127	checked_mmap(PROT_READ, MAP_SHARED, zerofd, 0,
128	    "simple /dev/zero shared");
129	checked_mmap(PROT_READ | PROT_WRITE, MAP_PRIVATE, zerofd, 0,
130	    "simple /dev/zero private");
131	checked_mmap(PROT_READ, MAP_SHARED, devstatfd, 0,
132	    "simple /dev/devstat shared");
133
134#if 0
135	/*
136	 * These tests do not fail without r271635 and followup fixes.
137	 * Those changes will not be merged to stable/10 since they
138	 * are potentially disruptive.
139	 */
140
141	/* Extra PROT flags. */
142	checked_mmap(PROT_READ | PROT_WRITE | 0x100000, MAP_ANON, -1, EINVAL,
143	    "MAP_ANON with extra PROT flags");
144	checked_mmap(0xffff, MAP_SHARED, shmfd, EINVAL,
145	    "shm fd with garbage PROT");
146
147	/* Undefined flag. */
148	checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON | MAP_RESERVED0080, -1,
149	    EINVAL, "Undefined flag");
150
151	/* Both MAP_SHARED and MAP_PRIVATE */
152	checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE |
153	    MAP_SHARED, -1, EINVAL, "MAP_ANON with both SHARED and PRIVATE");
154	checked_mmap(PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_SHARED, shmfd,
155	    EINVAL, "shm fd with both SHARED and PRIVATE");
156
157	/* At least one of MAP_SHARED or MAP_PRIVATE without ANON */
158	checked_mmap(PROT_READ | PROT_WRITE, 0, shmfd, EINVAL,
159	    "shm fd without sharing flag");
160#endif
161
162	/* MAP_ANON with either sharing flag (impacts fork). */
163	checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON | MAP_SHARED, -1, 0,
164	    "shared MAP_ANON");
165	checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0,
166	    "private MAP_ANON");
167
168	/* MAP_ANON should require an fd of -1. */
169	checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, 0, EINVAL,
170	    "MAP_ANON with fd != -1");
171
172	/* Writable MAP_SHARED should fail on read-only descriptors. */
173	checked_mmap(PROT_READ | PROT_WRITE, MAP_SHARED, zerofd, EACCES,
174	    "MAP_SHARED of read-only /dev/zero");
175
176	/*
177	 * Character devices other than /dev/zero do not support private
178	 * mappings.
179	 */
180	checked_mmap(PROT_READ, MAP_PRIVATE, devstatfd, EINVAL,
181	    "MAP_PRIVATE of /dev/devstat");
182}
183
184ATF_TC_WITHOUT_HEAD(mmap__dev_zero_private);
185ATF_TC_BODY(mmap__dev_zero_private, tc)
186{
187	char *p1, *p2, *p3;
188	size_t i;
189	int fd;
190
191	ATF_REQUIRE((fd = open("/dev/zero", O_RDONLY)) >= 0);
192
193	p1 = mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE, MAP_PRIVATE, fd,
194	    0);
195	ATF_REQUIRE(p1 != MAP_FAILED);
196
197	p2 = mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE, MAP_PRIVATE, fd,
198	    0);
199	ATF_REQUIRE(p2 != MAP_FAILED);
200
201	for (i = 0; i < getpagesize(); i++)
202		ATF_REQUIRE_EQ_MSG(0, p1[i], "byte at p1[%zu] is %x", i, p1[i]);
203
204	ATF_REQUIRE(memcmp(p1, p2, getpagesize()) == 0);
205
206	p1[0] = 1;
207
208	ATF_REQUIRE(p2[0] == 0);
209
210	p2[0] = 2;
211
212	ATF_REQUIRE(p1[0] == 1);
213
214	p3 = mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE, MAP_PRIVATE, fd,
215	    0);
216	ATF_REQUIRE(p3 != MAP_FAILED);
217
218	ATF_REQUIRE(p3[0] == 0);
219}
220
221ATF_TC_WITHOUT_HEAD(mmap__dev_zero_shared);
222ATF_TC_BODY(mmap__dev_zero_shared, tc)
223{
224	char *p1, *p2, *p3;
225	size_t i;
226	int fd;
227
228	ATF_REQUIRE((fd = open("/dev/zero", O_RDWR)) >= 0);
229
230	p1 = mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE, MAP_SHARED, fd,
231	    0);
232	ATF_REQUIRE(p1 != MAP_FAILED);
233
234	p2 = mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE, MAP_SHARED, fd,
235	    0);
236	ATF_REQUIRE(p2 != MAP_FAILED);
237
238	for (i = 0; i < getpagesize(); i++)
239		ATF_REQUIRE_EQ_MSG(0, p1[i], "byte at p1[%zu] is %x", i, p1[i]);
240
241	ATF_REQUIRE(memcmp(p1, p2, getpagesize()) == 0);
242
243	p1[0] = 1;
244
245	ATF_REQUIRE(p2[0] == 0);
246
247	p2[0] = 2;
248
249	ATF_REQUIRE(p1[0] == 1);
250
251	p3 = mmap(NULL, getpagesize(), PROT_READ | PROT_WRITE, MAP_SHARED, fd,
252	    0);
253	ATF_REQUIRE(p3 != MAP_FAILED);
254
255	ATF_REQUIRE(p3[0] == 0);
256}
257
258ATF_TP_ADD_TCS(tp)
259{
260
261	ATF_TP_ADD_TC(tp, mmap__map_at_zero);
262	ATF_TP_ADD_TC(tp, mmap__bad_arguments);
263	ATF_TP_ADD_TC(tp, mmap__dev_zero_private);
264	ATF_TP_ADD_TC(tp, mmap__dev_zero_shared);
265
266	return (atf_no_error());
267}
268