Branch data Line data Source code
1 : : /* SPDX-License-Identifier: LGPL-2.1+ */
2 : :
3 : : #include <sys/mount.h>
4 : : #include <unistd.h>
5 : :
6 : : #include "alloc-util.h"
7 : : #include "def.h"
8 : : #include "fd-util.h"
9 : : #include "fileio.h"
10 : : #include "hashmap.h"
11 : : #include "log.h"
12 : : #include "mountpoint-util.h"
13 : : #include "path-util.h"
14 : : #include "rm-rf.h"
15 : : #include "string-util.h"
16 : : #include "tests.h"
17 : :
18 : 28 : static void test_mount_propagation_flags(const char *name, int ret, unsigned long expected) {
19 : : long unsigned flags;
20 : :
21 [ + - ]: 28 : log_info("/* %s(%s) */", __func__, name);
22 : :
23 [ - + ]: 28 : assert_se(mount_propagation_flags_from_string(name, &flags) == ret);
24 : :
25 [ + + ]: 28 : if (ret >= 0) {
26 : : const char *c;
27 : :
28 [ - + ]: 20 : assert_se(flags == expected);
29 : :
30 : 20 : c = mount_propagation_flags_to_string(flags);
31 [ + + ]: 20 : if (isempty(name))
32 [ - + ]: 8 : assert_se(isempty(c));
33 : : else
34 [ - + ]: 12 : assert_se(streq(c, name));
35 : : }
36 : 28 : }
37 : :
38 : 4 : static void test_mnt_id(void) {
39 : 4 : _cleanup_fclose_ FILE *f = NULL;
40 : 4 : _cleanup_hashmap_free_free_ Hashmap *h = NULL;
41 : : Iterator i;
42 : : char *p;
43 : : void *k;
44 : : int r;
45 : :
46 [ + - ]: 4 : log_info("/* %s */", __func__);
47 : :
48 [ - + ]: 4 : assert_se(f = fopen("/proc/self/mountinfo", "re"));
49 [ - + ]: 4 : assert_se(h = hashmap_new(&trivial_hash_ops));
50 : :
51 : 156 : for (;;) {
52 [ + + + + ]: 164 : _cleanup_free_ char *line = NULL, *path = NULL;
53 : : int mnt_id;
54 : :
55 : 160 : r = read_line(f, LONG_LINE_MAX, &line);
56 [ + + ]: 160 : if (r == 0)
57 : 4 : break;
58 [ - + ]: 156 : assert_se(r > 0);
59 : :
60 [ - + ]: 156 : assert_se(sscanf(line, "%i %*s %*s %*s %ms", &mnt_id, &path) == 2);
61 : : #if HAS_FEATURE_MEMORY_SANITIZER
62 : : /* We don't know the length of the string, so we need to unpoison it one char at a time */
63 : : for (const char *c = path; ;c++) {
64 : : msan_unpoison(c, 1);
65 : : if (!*c)
66 : : break;
67 : : }
68 : : #endif
69 [ + - ]: 156 : log_debug("mountinfo: %s → %i", path, mnt_id);
70 : :
71 [ - + ]: 156 : assert_se(hashmap_put(h, INT_TO_PTR(mnt_id), path) >= 0);
72 : 156 : path = NULL;
73 : : }
74 : :
75 [ + + ]: 160 : HASHMAP_FOREACH_KEY(p, k, h, i) {
76 : 156 : int mnt_id = PTR_TO_INT(k), mnt_id2;
77 : :
78 : 156 : r = path_get_mnt_id(p, &mnt_id2);
79 [ + + ]: 156 : if (r < 0) {
80 [ + - ]: 4 : log_debug_errno(r, "Failed to get the mnt id of %s: %m\n", p);
81 : 152 : continue;
82 : : }
83 : :
84 [ + - ]: 152 : log_debug("mnt ids of %s are %i, %i\n", p, mnt_id, mnt_id2);
85 : :
86 [ + + ]: 152 : if (mnt_id == mnt_id2)
87 : 148 : continue;
88 : :
89 : : /* The ids don't match? If so, then there are two mounts on the same path, let's check if
90 : : * that's really the case */
91 : 4 : char *t = hashmap_get(h, INT_TO_PTR(mnt_id2));
92 [ + - ]: 4 : log_debug("the other path for mnt id %i is %s\n", mnt_id2, t);
93 [ - + ]: 4 : assert_se(path_equal(p, t));
94 : : }
95 : 4 : }
96 : :
97 : 4 : static void test_path_is_mount_point(void) {
98 : : int fd;
99 : 4 : char tmp_dir[] = "/tmp/test-path-is-mount-point-XXXXXX";
100 : 4 : _cleanup_free_ char *file1 = NULL, *file2 = NULL, *link1 = NULL, *link2 = NULL;
101 : 4 : _cleanup_free_ char *dir1 = NULL, *dir1file = NULL, *dirlink1 = NULL, *dirlink1file = NULL;
102 : 4 : _cleanup_free_ char *dir2 = NULL, *dir2file = NULL;
103 : :
104 [ + - ]: 4 : log_info("/* %s */", __func__);
105 : :
106 [ - + ]: 4 : assert_se(path_is_mount_point("/", NULL, AT_SYMLINK_FOLLOW) > 0);
107 [ - + ]: 4 : assert_se(path_is_mount_point("/", NULL, 0) > 0);
108 [ - + ]: 4 : assert_se(path_is_mount_point("//", NULL, AT_SYMLINK_FOLLOW) > 0);
109 [ - + ]: 4 : assert_se(path_is_mount_point("//", NULL, 0) > 0);
110 : :
111 [ - + ]: 4 : assert_se(path_is_mount_point("/proc", NULL, AT_SYMLINK_FOLLOW) > 0);
112 [ - + ]: 4 : assert_se(path_is_mount_point("/proc", NULL, 0) > 0);
113 [ - + ]: 4 : assert_se(path_is_mount_point("/proc/", NULL, AT_SYMLINK_FOLLOW) > 0);
114 [ - + ]: 4 : assert_se(path_is_mount_point("/proc/", NULL, 0) > 0);
115 : :
116 [ - + ]: 4 : assert_se(path_is_mount_point("/proc/1", NULL, AT_SYMLINK_FOLLOW) == 0);
117 [ - + ]: 4 : assert_se(path_is_mount_point("/proc/1", NULL, 0) == 0);
118 [ - + ]: 4 : assert_se(path_is_mount_point("/proc/1/", NULL, AT_SYMLINK_FOLLOW) == 0);
119 [ - + ]: 4 : assert_se(path_is_mount_point("/proc/1/", NULL, 0) == 0);
120 : :
121 [ - + ]: 4 : assert_se(path_is_mount_point("/sys", NULL, AT_SYMLINK_FOLLOW) > 0);
122 [ - + ]: 4 : assert_se(path_is_mount_point("/sys", NULL, 0) > 0);
123 [ - + ]: 4 : assert_se(path_is_mount_point("/sys/", NULL, AT_SYMLINK_FOLLOW) > 0);
124 [ - + ]: 4 : assert_se(path_is_mount_point("/sys/", NULL, 0) > 0);
125 : :
126 : : /* we'll create a hierarchy of different kinds of dir/file/link
127 : : * layouts:
128 : : *
129 : : * <tmp>/file1, <tmp>/file2
130 : : * <tmp>/link1 -> file1, <tmp>/link2 -> file2
131 : : * <tmp>/dir1/
132 : : * <tmp>/dir1/file
133 : : * <tmp>/dirlink1 -> dir1
134 : : * <tmp>/dirlink1file -> dirlink1/file
135 : : * <tmp>/dir2/
136 : : * <tmp>/dir2/file
137 : : */
138 : :
139 : : /* file mountpoints */
140 [ - + ]: 4 : assert_se(mkdtemp(tmp_dir) != NULL);
141 : 4 : file1 = path_join(tmp_dir, "file1");
142 [ - + ]: 4 : assert_se(file1);
143 : 4 : file2 = path_join(tmp_dir, "file2");
144 [ - + ]: 4 : assert_se(file2);
145 : 4 : fd = open(file1, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0664);
146 [ - + ]: 4 : assert_se(fd > 0);
147 : 4 : close(fd);
148 : 4 : fd = open(file2, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0664);
149 [ - + ]: 4 : assert_se(fd > 0);
150 : 4 : close(fd);
151 : 4 : link1 = path_join(tmp_dir, "link1");
152 [ - + ]: 4 : assert_se(link1);
153 [ - + ]: 4 : assert_se(symlink("file1", link1) == 0);
154 : 4 : link2 = path_join(tmp_dir, "link2");
155 [ - + ]: 4 : assert_se(link1);
156 [ - + ]: 4 : assert_se(symlink("file2", link2) == 0);
157 : :
158 [ - + ]: 4 : assert_se(path_is_mount_point(file1, NULL, AT_SYMLINK_FOLLOW) == 0);
159 [ - + ]: 4 : assert_se(path_is_mount_point(file1, NULL, 0) == 0);
160 [ - + ]: 4 : assert_se(path_is_mount_point(link1, NULL, AT_SYMLINK_FOLLOW) == 0);
161 [ - + ]: 4 : assert_se(path_is_mount_point(link1, NULL, 0) == 0);
162 : :
163 : : /* directory mountpoints */
164 : 4 : dir1 = path_join(tmp_dir, "dir1");
165 [ - + ]: 4 : assert_se(dir1);
166 [ - + ]: 4 : assert_se(mkdir(dir1, 0755) == 0);
167 : 4 : dirlink1 = path_join(tmp_dir, "dirlink1");
168 [ - + ]: 4 : assert_se(dirlink1);
169 [ - + ]: 4 : assert_se(symlink("dir1", dirlink1) == 0);
170 : 4 : dirlink1file = path_join(tmp_dir, "dirlink1file");
171 [ - + ]: 4 : assert_se(dirlink1file);
172 [ - + ]: 4 : assert_se(symlink("dirlink1/file", dirlink1file) == 0);
173 : 4 : dir2 = path_join(tmp_dir, "dir2");
174 [ - + ]: 4 : assert_se(dir2);
175 [ - + ]: 4 : assert_se(mkdir(dir2, 0755) == 0);
176 : :
177 [ - + ]: 4 : assert_se(path_is_mount_point(dir1, NULL, AT_SYMLINK_FOLLOW) == 0);
178 [ - + ]: 4 : assert_se(path_is_mount_point(dir1, NULL, 0) == 0);
179 [ - + ]: 4 : assert_se(path_is_mount_point(dirlink1, NULL, AT_SYMLINK_FOLLOW) == 0);
180 [ - + ]: 4 : assert_se(path_is_mount_point(dirlink1, NULL, 0) == 0);
181 : :
182 : : /* file in subdirectory mountpoints */
183 : 4 : dir1file = path_join(dir1, "file");
184 [ - + ]: 4 : assert_se(dir1file);
185 : 4 : fd = open(dir1file, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0664);
186 [ - + ]: 4 : assert_se(fd > 0);
187 : 4 : close(fd);
188 : :
189 [ - + ]: 4 : assert_se(path_is_mount_point(dir1file, NULL, AT_SYMLINK_FOLLOW) == 0);
190 [ - + ]: 4 : assert_se(path_is_mount_point(dir1file, NULL, 0) == 0);
191 [ - + ]: 4 : assert_se(path_is_mount_point(dirlink1file, NULL, AT_SYMLINK_FOLLOW) == 0);
192 [ - + ]: 4 : assert_se(path_is_mount_point(dirlink1file, NULL, 0) == 0);
193 : :
194 : : /* these tests will only work as root */
195 [ - + ]: 4 : if (mount(file1, file2, NULL, MS_BIND, NULL) >= 0) {
196 : : int rf, rt, rdf, rdt, rlf, rlt, rl1f, rl1t;
197 : : const char *file2d;
198 : :
199 : : /* files */
200 : : /* capture results in vars, to avoid dangling mounts on failure */
201 [ # # ]: 0 : log_info("%s: %s", __func__, file2);
202 : 0 : rf = path_is_mount_point(file2, NULL, 0);
203 : 0 : rt = path_is_mount_point(file2, NULL, AT_SYMLINK_FOLLOW);
204 : :
205 [ # # # # : 0 : file2d = strjoina(file2, "/");
# # # # #
# # # ]
206 [ # # ]: 0 : log_info("%s: %s", __func__, file2d);
207 : 0 : rdf = path_is_mount_point(file2d, NULL, 0);
208 : 0 : rdt = path_is_mount_point(file2d, NULL, AT_SYMLINK_FOLLOW);
209 : :
210 [ # # ]: 0 : log_info("%s: %s", __func__, link2);
211 : 0 : rlf = path_is_mount_point(link2, NULL, 0);
212 : 0 : rlt = path_is_mount_point(link2, NULL, AT_SYMLINK_FOLLOW);
213 : :
214 [ # # ]: 0 : assert_se(umount(file2) == 0);
215 : :
216 [ # # ]: 0 : assert_se(rf == 1);
217 [ # # ]: 0 : assert_se(rt == 1);
218 [ # # ]: 0 : assert_se(rdf == -ENOTDIR);
219 [ # # ]: 0 : assert_se(rdt == -ENOTDIR);
220 [ # # ]: 0 : assert_se(rlf == 0);
221 [ # # ]: 0 : assert_se(rlt == 1);
222 : :
223 : : /* dirs */
224 : 0 : dir2file = path_join(dir2, "file");
225 [ # # ]: 0 : assert_se(dir2file);
226 : 0 : fd = open(dir2file, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0664);
227 [ # # ]: 0 : assert_se(fd > 0);
228 : 0 : close(fd);
229 : :
230 [ # # ]: 0 : assert_se(mount(dir2, dir1, NULL, MS_BIND, NULL) >= 0);
231 : :
232 [ # # ]: 0 : log_info("%s: %s", __func__, dir1);
233 : 0 : rf = path_is_mount_point(dir1, NULL, 0);
234 : 0 : rt = path_is_mount_point(dir1, NULL, AT_SYMLINK_FOLLOW);
235 [ # # ]: 0 : log_info("%s: %s", __func__, dirlink1);
236 : 0 : rlf = path_is_mount_point(dirlink1, NULL, 0);
237 : 0 : rlt = path_is_mount_point(dirlink1, NULL, AT_SYMLINK_FOLLOW);
238 [ # # ]: 0 : log_info("%s: %s", __func__, dirlink1file);
239 : : /* its parent is a mount point, but not /file itself */
240 : 0 : rl1f = path_is_mount_point(dirlink1file, NULL, 0);
241 : 0 : rl1t = path_is_mount_point(dirlink1file, NULL, AT_SYMLINK_FOLLOW);
242 : :
243 [ # # ]: 0 : assert_se(umount(dir1) == 0);
244 : :
245 [ # # ]: 0 : assert_se(rf == 1);
246 [ # # ]: 0 : assert_se(rt == 1);
247 [ # # ]: 0 : assert_se(rlf == 0);
248 [ # # ]: 0 : assert_se(rlt == 1);
249 [ # # ]: 0 : assert_se(rl1f == 0);
250 [ # # ]: 0 : assert_se(rl1t == 0);
251 : :
252 : : } else
253 : 4 : printf("Skipping bind mount file test: %m\n");
254 : :
255 [ - + ]: 4 : assert_se(rm_rf(tmp_dir, REMOVE_ROOT|REMOVE_PHYSICAL) == 0);
256 : 4 : }
257 : :
258 : 4 : int main(int argc, char *argv[]) {
259 : 4 : test_setup_logging(LOG_DEBUG);
260 : :
261 : 4 : test_mount_propagation_flags("shared", 0, MS_SHARED);
262 : 4 : test_mount_propagation_flags("slave", 0, MS_SLAVE);
263 : 4 : test_mount_propagation_flags("private", 0, MS_PRIVATE);
264 : 4 : test_mount_propagation_flags(NULL, 0, 0);
265 : 4 : test_mount_propagation_flags("", 0, 0);
266 : 4 : test_mount_propagation_flags("xxxx", -EINVAL, 0);
267 : 4 : test_mount_propagation_flags(" ", -EINVAL, 0);
268 : :
269 : 4 : test_mnt_id();
270 : 4 : test_path_is_mount_point();
271 : :
272 : 4 : return 0;
273 : : }
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