2 * Copyright (c) 2009 Simon L. Nielsen <simon@FreeBSD.org>,
3 * Bjoern A. Zeeb <bz@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
27 #include <sys/param.h>
29 #include <sys/sysctl.h>
41 int ok[2]; /* Depending on security.bsd.map_at_zero {0, !=0}. */
42 } map_at_zero_tests[] = {
43 { (void *)0, { 0, 1 } }, /* Test sysctl. */
44 { (void *)1, { 0, 0 } },
45 { (void *)(PAGE_SIZE - 1), { 0, 0 } },
46 { (void *)PAGE_SIZE, { 1, 1 } },
47 { (void *)-1, { 0, 0 } },
48 { (void *)(-PAGE_SIZE), { 0, 0 } },
49 { (void *)(-1 - PAGE_SIZE), { 0, 0 } },
50 { (void *)(-1 - PAGE_SIZE - 1), { 0, 0 } },
51 { (void *)(0x1000 * PAGE_SIZE), { 1, 1 } },
54 #define MAP_AT_ZERO "security.bsd.map_at_zero"
57 #define ALLOW_WX "kern.elf64.allow_wx"
59 #define ALLOW_WX "kern.elf32.allow_wx"
62 ATF_TC_WITHOUT_HEAD(mmap__map_at_zero);
63 ATF_TC_BODY(mmap__map_at_zero, tc)
72 len = sizeof(map_at_zero);
73 if (sysctlbyname(MAP_AT_ZERO, &map_at_zero, &len, NULL, 0) == -1) {
74 atf_tc_skip("sysctl for %s failed: %s\n", MAP_AT_ZERO,
79 len = sizeof(allow_wx);
80 if (sysctlbyname(ALLOW_WX, &allow_wx, &len, NULL, 0) == -1) {
81 if (errno == ENOENT) {
82 /* Allow W+X if sysctl isn't present */
85 atf_tc_skip("sysctl for %s failed: %s\n", ALLOW_WX,
91 /* Normalize to 0 or 1 for array access. */
92 map_at_zero = !!map_at_zero;
94 for (i = 0; i < nitems(map_at_zero_tests); i++) {
95 prot_flags = PROT_READ | PROT_WRITE;
97 prot_flags |= PROT_EXEC;
98 p = mmap((void *)map_at_zero_tests[i].addr, PAGE_SIZE,
99 prot_flags, MAP_ANON | MAP_FIXED, -1, 0);
100 if (p == MAP_FAILED) {
101 ATF_CHECK_MSG(map_at_zero_tests[i].ok[map_at_zero] == 0,
102 "mmap(%p, ...) failed", map_at_zero_tests[i].addr);
104 ATF_CHECK_MSG(map_at_zero_tests[i].ok[map_at_zero] == 1,
105 "mmap(%p, ...) succeeded: p=%p\n",
106 map_at_zero_tests[i].addr, p);
112 checked_mmap(int prot, int flags, int fd, int error, const char *msg)
117 ATF_REQUIRE((pagesize = getpagesize()) > 0);
118 p = mmap(NULL, pagesize, prot, flags, fd, 0);
119 if (p == MAP_FAILED) {
121 ATF_CHECK_MSG(0, "%s failed with errno %d", msg,
124 ATF_CHECK_EQ_MSG(error, errno,
125 "%s failed with wrong errno %d (expected %d)", msg,
128 ATF_CHECK_MSG(error == 0, "%s succeeded", msg);
133 ATF_TC_WITHOUT_HEAD(mmap__bad_arguments);
134 ATF_TC_BODY(mmap__bad_arguments, tc)
136 int devstatfd, pagesize, shmfd, zerofd;
138 ATF_REQUIRE((pagesize = getpagesize()) > 0);
139 ATF_REQUIRE((devstatfd = open("/dev/devstat", O_RDONLY)) >= 0);
140 ATF_REQUIRE((shmfd = shm_open(SHM_ANON, O_RDWR, 0644)) >= 0);
141 ATF_REQUIRE(ftruncate(shmfd, pagesize) == 0);
142 ATF_REQUIRE((zerofd = open("/dev/zero", O_RDONLY)) >= 0);
144 /* These should work. */
145 checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON, -1, 0,
147 checked_mmap(PROT_READ | PROT_WRITE, MAP_SHARED, shmfd, 0,
148 "simple shm fd shared");
149 checked_mmap(PROT_READ | PROT_WRITE, MAP_PRIVATE, shmfd, 0,
150 "simple shm fd private");
151 checked_mmap(PROT_READ, MAP_SHARED, zerofd, 0,
152 "simple /dev/zero shared");
153 checked_mmap(PROT_READ | PROT_WRITE, MAP_PRIVATE, zerofd, 0,
154 "simple /dev/zero private");
155 checked_mmap(PROT_READ, MAP_SHARED, devstatfd, 0,
156 "simple /dev/devstat shared");
158 /* Extra PROT flags. */
159 checked_mmap(PROT_READ | PROT_WRITE | 0x100000, MAP_ANON, -1, EINVAL,
160 "MAP_ANON with extra PROT flags");
161 checked_mmap(0xffff, MAP_SHARED, shmfd, EINVAL,
162 "shm fd with garbage PROT");
164 /* Undefined flag. */
165 checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON | MAP_RESERVED0080, -1,
166 EINVAL, "Undefined flag");
168 /* Both MAP_SHARED and MAP_PRIVATE */
169 checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE |
170 MAP_SHARED, -1, EINVAL, "MAP_ANON with both SHARED and PRIVATE");
171 checked_mmap(PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_SHARED, shmfd,
172 EINVAL, "shm fd with both SHARED and PRIVATE");
174 /* At least one of MAP_SHARED or MAP_PRIVATE without ANON */
175 checked_mmap(PROT_READ | PROT_WRITE, 0, shmfd, EINVAL,
176 "shm fd without sharing flag");
178 /* MAP_ANON with either sharing flag (impacts fork). */
179 checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON | MAP_SHARED, -1, 0,
181 checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0,
184 /* MAP_ANON should require an fd of -1. */
185 checked_mmap(PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE, 0, EINVAL,
186 "MAP_ANON with fd != -1");
188 /* Writable MAP_SHARED should fail on read-only descriptors. */
189 checked_mmap(PROT_READ | PROT_WRITE, MAP_SHARED, zerofd, EACCES,
190 "MAP_SHARED of read-only /dev/zero");
193 * Character devices other than /dev/zero do not support private
196 checked_mmap(PROT_READ, MAP_PRIVATE, devstatfd, EINVAL,
197 "MAP_PRIVATE of /dev/devstat");
204 ATF_TC_WITHOUT_HEAD(mmap__dev_zero_private);
205 ATF_TC_BODY(mmap__dev_zero_private, tc)
210 ATF_REQUIRE((pagesize = getpagesize()) > 0);
211 ATF_REQUIRE((fd = open("/dev/zero", O_RDONLY)) >= 0);
213 p1 = mmap(NULL, pagesize, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
214 ATF_REQUIRE(p1 != MAP_FAILED);
216 p2 = mmap(NULL, pagesize, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
217 ATF_REQUIRE(p2 != MAP_FAILED);
219 for (i = 0; i < pagesize; i++)
220 ATF_REQUIRE_EQ_MSG(0, p1[i], "byte at p1[%d] is %x", i, p1[i]);
222 ATF_REQUIRE(memcmp(p1, p2, pagesize) == 0);
226 ATF_REQUIRE(p2[0] == 0);
230 ATF_REQUIRE(p1[0] == 1);
232 p3 = mmap(NULL, pagesize, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
233 ATF_REQUIRE(p3 != MAP_FAILED);
235 ATF_REQUIRE(p3[0] == 0);
237 munmap(p1, pagesize);
238 munmap(p2, pagesize);
239 munmap(p3, pagesize);
243 ATF_TC_WITHOUT_HEAD(mmap__dev_zero_shared);
244 ATF_TC_BODY(mmap__dev_zero_shared, tc)
249 ATF_REQUIRE((pagesize = getpagesize()) > 0);
250 ATF_REQUIRE((fd = open("/dev/zero", O_RDWR)) >= 0);
252 p1 = mmap(NULL, pagesize, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
253 ATF_REQUIRE(p1 != MAP_FAILED);
255 p2 = mmap(NULL, pagesize, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
256 ATF_REQUIRE(p2 != MAP_FAILED);
258 for (i = 0; i < pagesize; i++)
259 ATF_REQUIRE_EQ_MSG(0, p1[i], "byte at p1[%d] is %x", i, p1[i]);
261 ATF_REQUIRE(memcmp(p1, p2, pagesize) == 0);
265 ATF_REQUIRE(p2[0] == 0);
269 ATF_REQUIRE(p1[0] == 1);
271 p3 = mmap(NULL, pagesize, PROT_READ | PROT_WRITE, MAP_SHARED, fd,
273 ATF_REQUIRE(p3 != MAP_FAILED);
275 ATF_REQUIRE(p3[0] == 0);
277 munmap(p1, pagesize);
278 munmap(p2, pagesize);
279 munmap(p3, pagesize);
283 ATF_TC_WITHOUT_HEAD(mmap__write_only);
284 ATF_TC_BODY(mmap__write_only, tc)
289 ATF_REQUIRE((pagesize = getpagesize()) > 0);
290 p = mmap(NULL, pagesize, PROT_WRITE, MAP_ANON, -1, 0);
291 ATF_REQUIRE(p != MAP_FAILED);
293 *(volatile uint32_t *)p = 0x12345678;
301 ATF_TP_ADD_TC(tp, mmap__map_at_zero);
302 ATF_TP_ADD_TC(tp, mmap__bad_arguments);
303 ATF_TP_ADD_TC(tp, mmap__dev_zero_private);
304 ATF_TP_ADD_TC(tp, mmap__dev_zero_shared);
305 ATF_TP_ADD_TC(tp, mmap__write_only);
307 return (atf_no_error());