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/12/tests/sys/vm/mmap_test.c 313657 2017-02-11 20:31:57Z 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
40 static 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
57 ATF_TC_WITHOUT_HEAD(mmap__map_at_zero);
ATF_TC_BODY(mmap__map_at_zero,tc)58 ATF_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
90 static void
checked_mmap(int prot,int flags,int fd,int error,const char * msg)91 checked_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
112 ATF_TC_WITHOUT_HEAD(mmap__bad_arguments);
ATF_TC_BODY(mmap__bad_arguments,tc)113 ATF_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 /* Extra PROT flags. */
138 checked_mmap(PROT_READ | PROT_WRITE | 0x100000, MAP_ANON, -1, EINVAL,
139 "MAP_ANON with extra PROT flags");
140 checked_mmap(0xffff, MAP_SHARED, shmfd, EINVAL,
141 "shm fd with garbage PROT");
142
143 /* Undefined flag. */
144 checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON | MAP_RESERVED0080, -1,
145 EINVAL, "Undefined flag");
146
147 /* Both MAP_SHARED and MAP_PRIVATE */
148 checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE |
149 MAP_SHARED, -1, EINVAL, "MAP_ANON with both SHARED and PRIVATE");
150 checked_mmap(PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_SHARED, shmfd,
151 EINVAL, "shm fd with both SHARED and PRIVATE");
152
153 /* At least one of MAP_SHARED or MAP_PRIVATE without ANON */
154 checked_mmap(PROT_READ | PROT_WRITE, 0, shmfd, EINVAL,
155 "shm fd without sharing flag");
156
157 /* MAP_ANON with either sharing flag (impacts fork). */
158 checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON | MAP_SHARED, -1, 0,
159 "shared MAP_ANON");
160 checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0,
161 "private MAP_ANON");
162
163 /* MAP_ANON should require an fd of -1. */
164 checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, 0, EINVAL,
165 "MAP_ANON with fd != -1");
166
167 /* Writable MAP_SHARED should fail on read-only descriptors. */
168 checked_mmap(PROT_READ | PROT_WRITE, MAP_SHARED, zerofd, EACCES,
169 "MAP_SHARED of read-only /dev/zero");
170
171 /*
172 * Character devices other than /dev/zero do not support private
173 * mappings.
174 */
175 checked_mmap(PROT_READ, MAP_PRIVATE, devstatfd, EINVAL,
176 "MAP_PRIVATE of /dev/devstat");
177
178 close(devstatfd);
179 close(shmfd);
180 close(zerofd);
181 }
182
183 ATF_TC_WITHOUT_HEAD(mmap__dev_zero_private);
ATF_TC_BODY(mmap__dev_zero_private,tc)184 ATF_TC_BODY(mmap__dev_zero_private, tc)
185 {
186 char *p1, *p2, *p3;
187 int fd, i, pagesize;
188
189 ATF_REQUIRE((pagesize = getpagesize()) > 0);
190 ATF_REQUIRE((fd = open("/dev/zero", O_RDONLY)) >= 0);
191
192 p1 = mmap(NULL, pagesize, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
193 ATF_REQUIRE(p1 != MAP_FAILED);
194
195 p2 = mmap(NULL, pagesize, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
196 ATF_REQUIRE(p2 != MAP_FAILED);
197
198 for (i = 0; i < pagesize; i++)
199 ATF_REQUIRE_EQ_MSG(0, p1[i], "byte at p1[%d] is %x", i, p1[i]);
200
201 ATF_REQUIRE(memcmp(p1, p2, pagesize) == 0);
202
203 p1[0] = 1;
204
205 ATF_REQUIRE(p2[0] == 0);
206
207 p2[0] = 2;
208
209 ATF_REQUIRE(p1[0] == 1);
210
211 p3 = mmap(NULL, pagesize, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
212 ATF_REQUIRE(p3 != MAP_FAILED);
213
214 ATF_REQUIRE(p3[0] == 0);
215
216 munmap(p1, pagesize);
217 munmap(p2, pagesize);
218 munmap(p3, pagesize);
219 close(fd);
220 }
221
222 ATF_TC_WITHOUT_HEAD(mmap__dev_zero_shared);
ATF_TC_BODY(mmap__dev_zero_shared,tc)223 ATF_TC_BODY(mmap__dev_zero_shared, tc)
224 {
225 char *p1, *p2, *p3;
226 int fd, i, pagesize;
227
228 ATF_REQUIRE((pagesize = getpagesize()) > 0);
229 ATF_REQUIRE((fd = open("/dev/zero", O_RDWR)) >= 0);
230
231 p1 = mmap(NULL, pagesize, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
232 ATF_REQUIRE(p1 != MAP_FAILED);
233
234 p2 = mmap(NULL, pagesize, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
235 ATF_REQUIRE(p2 != MAP_FAILED);
236
237 for (i = 0; i < pagesize; i++)
238 ATF_REQUIRE_EQ_MSG(0, p1[i], "byte at p1[%d] is %x", i, p1[i]);
239
240 ATF_REQUIRE(memcmp(p1, p2, pagesize) == 0);
241
242 p1[0] = 1;
243
244 ATF_REQUIRE(p2[0] == 0);
245
246 p2[0] = 2;
247
248 ATF_REQUIRE(p1[0] == 1);
249
250 p3 = mmap(NULL, pagesize, PROT_READ | PROT_WRITE, MAP_SHARED, fd,
251 0);
252 ATF_REQUIRE(p3 != MAP_FAILED);
253
254 ATF_REQUIRE(p3[0] == 0);
255
256 munmap(p1, pagesize);
257 munmap(p2, pagesize);
258 munmap(p3, pagesize);
259 close(fd);
260 }
261
ATF_TP_ADD_TCS(tp)262 ATF_TP_ADD_TCS(tp)
263 {
264
265 ATF_TP_ADD_TC(tp, mmap__map_at_zero);
266 ATF_TP_ADD_TC(tp, mmap__bad_arguments);
267 ATF_TP_ADD_TC(tp, mmap__dev_zero_private);
268 ATF_TP_ADD_TC(tp, mmap__dev_zero_shared);
269
270 return (atf_no_error());
271 }
272