mmap_test.c revision 299057 
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 299057 2016-05-04 07:35:43Z ngie $
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	int pagesize;
95
96	ATF_REQUIRE((pagesize = getpagesize()) > 0);
97	p = mmap(NULL, pagesize, prot, flags, fd, 0);
98	if (p == MAP_FAILED) {
99		if (error == 0)
100			ATF_CHECK_MSG(0, "%s failed with errno %d", msg,
101			    errno);
102		else
103			ATF_CHECK_EQ_MSG(error, errno,
104			    "%s failed with wrong errno %d (expected %d)", msg,
105			    errno, error);
106	} else {
107		ATF_CHECK_MSG(error == 0, "%s succeeded", msg);
108		munmap(p, pagesize);
109	}
110}
111
112ATF_TC_WITHOUT_HEAD(mmap__bad_arguments);
113ATF_TC_BODY(mmap__bad_arguments, tc)
114{
115	int devstatfd, pagesize, shmfd, zerofd;
116
117	ATF_REQUIRE((pagesize = getpagesize()) > 0);
118	ATF_REQUIRE((devstatfd = open("/dev/devstat", O_RDONLY)) >= 0);
119	ATF_REQUIRE((shmfd = shm_open(SHM_ANON, O_RDWR, 0644)) >= 0);
120	ATF_REQUIRE(ftruncate(shmfd, pagesize) == 0);
121	ATF_REQUIRE((zerofd = open("/dev/zero", O_RDONLY)) >= 0);
122
123	/* These should work. */
124	checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON, -1, 0,
125	    "simple MAP_ANON");
126	checked_mmap(PROT_READ | PROT_WRITE, MAP_SHARED, shmfd, 0,
127	    "simple shm fd shared");
128	checked_mmap(PROT_READ | PROT_WRITE, MAP_PRIVATE, shmfd, 0,
129	    "simple shm fd private");
130	checked_mmap(PROT_READ, MAP_SHARED, zerofd, 0,
131	    "simple /dev/zero shared");
132	checked_mmap(PROT_READ | PROT_WRITE, MAP_PRIVATE, zerofd, 0,
133	    "simple /dev/zero private");
134	checked_mmap(PROT_READ, MAP_SHARED, devstatfd, 0,
135	    "simple /dev/devstat shared");
136
137#if 0
138	/*
139	 * These tests do not fail without r271635 and followup fixes.
140	 * Those changes will not be merged to stable/10 since they
141	 * are potentially disruptive.
142	 */
143
144	/* Extra PROT flags. */
145	checked_mmap(PROT_READ | PROT_WRITE | 0x100000, MAP_ANON, -1, EINVAL,
146	    "MAP_ANON with extra PROT flags");
147	checked_mmap(0xffff, MAP_SHARED, shmfd, EINVAL,
148	    "shm fd with garbage PROT");
149
150	/* Undefined flag. */
151	checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON | MAP_RESERVED0080, -1,
152	    EINVAL, "Undefined flag");
153
154	/* Both MAP_SHARED and MAP_PRIVATE */
155	checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE |
156	    MAP_SHARED, -1, EINVAL, "MAP_ANON with both SHARED and PRIVATE");
157	checked_mmap(PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_SHARED, shmfd,
158	    EINVAL, "shm fd with both SHARED and PRIVATE");
159
160	/* At least one of MAP_SHARED or MAP_PRIVATE without ANON */
161	checked_mmap(PROT_READ | PROT_WRITE, 0, shmfd, EINVAL,
162	    "shm fd without sharing flag");
163#endif
164
165	/* MAP_ANON with either sharing flag (impacts fork). */
166	checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON | MAP_SHARED, -1, 0,
167	    "shared MAP_ANON");
168	checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0,
169	    "private MAP_ANON");
170
171	/* MAP_ANON should require an fd of -1. */
172	checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, 0, EINVAL,
173	    "MAP_ANON with fd != -1");
174
175	/* Writable MAP_SHARED should fail on read-only descriptors. */
176	checked_mmap(PROT_READ | PROT_WRITE, MAP_SHARED, zerofd, EACCES,
177	    "MAP_SHARED of read-only /dev/zero");
178
179	/*
180	 * Character devices other than /dev/zero do not support private
181	 * mappings.
182	 */
183	checked_mmap(PROT_READ, MAP_PRIVATE, devstatfd, EINVAL,
184	    "MAP_PRIVATE of /dev/devstat");
185
186	close(devstatfd);
187	close(shmfd);
188	close(zerofd);
189}
190
191ATF_TC_WITHOUT_HEAD(mmap__dev_zero_private);
192ATF_TC_BODY(mmap__dev_zero_private, tc)
193{
194	char *p1, *p2, *p3;
195	size_t i;
196	int fd, pagesize;
197
198	ATF_REQUIRE((pagesize = getpagesize()) > 0);
199	ATF_REQUIRE((fd = open("/dev/zero", O_RDONLY)) >= 0);
200
201	p1 = mmap(NULL, pagesize, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
202	ATF_REQUIRE(p1 != MAP_FAILED);
203
204	p2 = mmap(NULL, pagesize, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
205	ATF_REQUIRE(p2 != MAP_FAILED);
206
207	for (i = 0; i < pagesize; i++)
208		ATF_REQUIRE_EQ_MSG(0, p1[i], "byte at p1[%zu] is %x", i, p1[i]);
209
210	ATF_REQUIRE(memcmp(p1, p2, pagesize) == 0);
211
212	p1[0] = 1;
213
214	ATF_REQUIRE(p2[0] == 0);
215
216	p2[0] = 2;
217
218	ATF_REQUIRE(p1[0] == 1);
219
220	p3 = mmap(NULL, pagesize, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
221	ATF_REQUIRE(p3 != MAP_FAILED);
222
223	ATF_REQUIRE(p3[0] == 0);
224
225	munmap(p1, pagesize);
226	munmap(p2, pagesize);
227	munmap(p3, pagesize);
228	close(fd);
229}
230
231ATF_TC_WITHOUT_HEAD(mmap__dev_zero_shared);
232ATF_TC_BODY(mmap__dev_zero_shared, tc)
233{
234	char *p1, *p2, *p3;
235	size_t i;
236	int fd, pagesize;
237
238	ATF_REQUIRE((pagesize = getpagesize()) > 0);
239	ATF_REQUIRE((fd = open("/dev/zero", O_RDWR)) >= 0);
240
241	p1 = mmap(NULL, pagesize, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
242	ATF_REQUIRE(p1 != MAP_FAILED);
243
244	p2 = mmap(NULL, pagesize, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
245	ATF_REQUIRE(p2 != MAP_FAILED);
246
247	for (i = 0; i < pagesize; i++)
248		ATF_REQUIRE_EQ_MSG(0, p1[i], "byte at p1[%zu] is %x", i, p1[i]);
249
250	ATF_REQUIRE(memcmp(p1, p2, pagesize) == 0);
251
252	p1[0] = 1;
253
254	ATF_REQUIRE(p2[0] == 0);
255
256	p2[0] = 2;
257
258	ATF_REQUIRE(p1[0] == 1);
259
260	p3 = mmap(NULL, pagesize, PROT_READ | PROT_WRITE, MAP_SHARED, fd,
261	    0);
262	ATF_REQUIRE(p3 != MAP_FAILED);
263
264	ATF_REQUIRE(p3[0] == 0);
265
266	munmap(p1, pagesize);
267	munmap(p2, pagesize);
268	munmap(p3, pagesize);
269	close(fd);
270}
271
272ATF_TP_ADD_TCS(tp)
273{
274
275	ATF_TP_ADD_TC(tp, mmap__map_at_zero);
276	ATF_TP_ADD_TC(tp, mmap__bad_arguments);
277	ATF_TP_ADD_TC(tp, mmap__dev_zero_private);
278	ATF_TP_ADD_TC(tp, mmap__dev_zero_shared);
279
280	return (atf_no_error());
281}
282