1 /* $OpenBSD: t_msync.c,v 1.2 2021/12/13 16:56:48 deraadt Exp $ */
2 /* $NetBSD: t_msync.c,v 1.3 2017/01/14 20:52:42 christos Exp $ */
3
4 /*-
5 * Copyright (c) 2011 The NetBSD Foundation, Inc.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to The NetBSD Foundation
9 * by Jukka Ruohonen.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #include "macros.h"
34
35 #include <sys/mman.h>
36
37 #include "atf-c.h"
38 #include <errno.h>
39 #include <fcntl.h>
40 #include <limits.h>
41 #include <stdlib.h>
42 #include <string.h>
43 #include <unistd.h>
44
45 static long page = 0;
46 static const off_t off = 512;
47 static const char path[] = "msync";
48
49 static const char *msync_sync(const char *, int);
50
51 static const char *
msync_sync(const char * garbage,int flags)52 msync_sync(const char *garbage, int flags)
53 {
54 char *buf, *map = MAP_FAILED;
55 const char *str = NULL;
56 size_t len;
57 int fd, rv;
58
59 /*
60 * Create a temporary file, write
61 * one page to it, and map the file.
62 */
63 buf = malloc(page);
64
65 if (buf == NULL)
66 return NULL;
67
68 memset(buf, 'x', page);
69
70 fd = open(path, O_RDWR | O_CREAT, 0700);
71
72 if (fd < 0) {
73 free(buf);
74 return "failed to open";
75 }
76
77 ATF_REQUIRE_MSG(write(fd, buf, page) != -1, "write(2) failed: %s",
78 strerror(errno));
79
80 map = mmap(NULL, page, PROT_READ | PROT_WRITE, MAP_FILE|MAP_PRIVATE,
81 fd, 0);
82
83 if (map == MAP_FAILED) {
84 str = "failed to map";
85 goto out;
86 }
87
88 /*
89 * Seek to an arbitrary offset and
90 * write garbage to this position.
91 */
92 if (lseek(fd, off, SEEK_SET) != off) {
93 str = "failed to seek";
94 goto out;
95 }
96
97 len = strlen(garbage);
98 rv = write(fd, garbage, len);
99
100 if (rv != (ssize_t)len) {
101 str = "failed to write garbage";
102 goto out;
103 }
104
105 /*
106 * Synchronize the mapping and verify
107 * that garbage is at the given offset.
108 */
109 if (msync(map, page, flags) != 0) {
110 str = "failed to msync";
111 goto out;
112 }
113
114 if (memcmp(map + off, garbage, len) != 0) {
115 str = "msync did not synchronize";
116 goto out;
117 }
118
119 out:
120 free(buf);
121
122 (void)close(fd);
123 (void)unlink(path);
124
125 if (map != MAP_FAILED)
126 (void)munmap(map, page);
127
128 return str;
129 }
130
131 ATF_TC(msync_async);
ATF_TC_HEAD(msync_async,tc)132 ATF_TC_HEAD(msync_async, tc)
133 {
134 atf_tc_set_md_var(tc, "descr", "Test of msync(2), MS_ASYNC");
135 }
136
ATF_TC_BODY(msync_async,tc)137 ATF_TC_BODY(msync_async, tc)
138 {
139 const char *str;
140
141 str = msync_sync("garbage", MS_ASYNC);
142
143 if (str != NULL)
144 atf_tc_fail("%s", str);
145 }
146
147 ATF_TC(msync_err);
ATF_TC_HEAD(msync_err,tc)148 ATF_TC_HEAD(msync_err, tc)
149 {
150 atf_tc_set_md_var(tc, "descr", "Test error conditions in msync(2)");
151 }
152
ATF_TC_BODY(msync_err,tc)153 ATF_TC_BODY(msync_err, tc)
154 {
155
156 char *map = MAP_FAILED;
157
158 /*
159 * Test that invalid flags error out.
160 */
161 ATF_REQUIRE(msync_sync("error", -1) != NULL);
162 ATF_REQUIRE(msync_sync("error", INT_MAX) != NULL);
163
164 errno = 0;
165
166 /*
167 * Map a page and then unmap to get an unmapped address.
168 */
169 map = mmap(NULL, page, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE,
170 -1, 0);
171 ATF_REQUIRE(map != MAP_FAILED);
172
173 (void)munmap(map, page);
174
175 ATF_REQUIRE(msync(map, page, MS_SYNC) != 0);
176 ATF_REQUIRE(errno == EFAULT);
177 }
178
179 ATF_TC(msync_invalidate);
ATF_TC_HEAD(msync_invalidate,tc)180 ATF_TC_HEAD(msync_invalidate, tc)
181 {
182 atf_tc_set_md_var(tc, "descr", "Test of msync(2), MS_INVALIDATE");
183 }
184
ATF_TC_BODY(msync_invalidate,tc)185 ATF_TC_BODY(msync_invalidate, tc)
186 {
187 const char *str;
188
189 str = msync_sync("garbage", MS_INVALIDATE);
190
191 if (str != NULL)
192 atf_tc_fail("%s", str);
193 }
194
195 ATF_TC(msync_sync);
ATF_TC_HEAD(msync_sync,tc)196 ATF_TC_HEAD(msync_sync, tc)
197 {
198 atf_tc_set_md_var(tc, "descr", "Test of msync(2), MS_SYNC");
199 }
200
ATF_TC_BODY(msync_sync,tc)201 ATF_TC_BODY(msync_sync, tc)
202 {
203 const char *str;
204
205 str = msync_sync("garbage", MS_SYNC);
206
207 if (str != NULL)
208 atf_tc_fail("%s", str);
209 }
210
ATF_TP_ADD_TCS(tp)211 ATF_TP_ADD_TCS(tp)
212 {
213
214 page = sysconf(_SC_PAGESIZE);
215
216 ATF_REQUIRE(page >= 0);
217 ATF_REQUIRE(page > off);
218
219 ATF_TP_ADD_TC(tp, msync_async);
220 ATF_TP_ADD_TC(tp, msync_err);
221 ATF_TP_ADD_TC(tp, msync_invalidate);
222 ATF_TP_ADD_TC(tp, msync_sync);
223
224 return atf_no_error();
225 }
226