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52ad194e | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
663996b3 | 2 | |
663996b3 | 3 | #include <errno.h> |
db2df898 | 4 | #include <ftw.h> |
663996b3 | 5 | #include <stdlib.h> |
db2df898 | 6 | #include <sys/mount.h> |
b012e921 | 7 | #include <sys/statvfs.h> |
663996b3 | 8 | #include <unistd.h> |
663996b3 | 9 | |
db2df898 | 10 | #include "alloc-util.h" |
fb183854 | 11 | #include "bus-util.h" |
db2df898 MP |
12 | #include "cgroup-util.h" |
13 | #include "dev-setup.h" | |
6e866b33 | 14 | #include "dirent-util.h" |
db2df898 | 15 | #include "efivars.h" |
6e866b33 | 16 | #include "fd-util.h" |
52ad194e | 17 | #include "fileio.h" |
5a920b42 | 18 | #include "fs-util.h" |
db2df898 | 19 | #include "label.h" |
663996b3 MS |
20 | #include "log.h" |
21 | #include "macro.h" | |
db2df898 | 22 | #include "missing.h" |
663996b3 | 23 | #include "mkdir.h" |
db2df898 | 24 | #include "mount-setup.h" |
6e866b33 | 25 | #include "mountpoint-util.h" |
663996b3 | 26 | #include "path-util.h" |
db2df898 | 27 | #include "set.h" |
60f067b4 | 28 | #include "smack-util.h" |
db2df898 MP |
29 | #include "strv.h" |
30 | #include "user-util.h" | |
31 | #include "util.h" | |
32 | #include "virt.h" | |
663996b3 MS |
33 | |
34 | typedef enum MountMode { | |
b012e921 MB |
35 | MNT_NONE = 0, |
36 | MNT_FATAL = 1 << 0, | |
37 | MNT_IN_CONTAINER = 1 << 1, | |
38 | MNT_CHECK_WRITABLE = 1 << 2, | |
663996b3 MS |
39 | } MountMode; |
40 | ||
41 | typedef struct MountPoint { | |
42 | const char *what; | |
43 | const char *where; | |
44 | const char *type; | |
45 | const char *options; | |
46 | unsigned long flags; | |
47 | bool (*condition_fn)(void); | |
48 | MountMode mode; | |
49 | } MountPoint; | |
50 | ||
51 | /* The first three entries we might need before SELinux is up. The | |
52 | * fourth (securityfs) is needed by IMA to load a custom policy. The | |
5eef597e MP |
53 | * other ones we can delay until SELinux and IMA are loaded. When |
54 | * SMACK is enabled we need smackfs, too, so it's a fifth one. */ | |
f5e65279 | 55 | #if ENABLE_SMACK |
663996b3 | 56 | #define N_EARLY_MOUNT 5 |
5eef597e MP |
57 | #else |
58 | #define N_EARLY_MOUNT 4 | |
59 | #endif | |
663996b3 MS |
60 | |
61 | static const MountPoint mount_table[] = { | |
f47781d8 MP |
62 | { "sysfs", "/sys", "sysfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
63 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
64 | { "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, | |
65 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
66 | { "devtmpfs", "/dev", "devtmpfs", "mode=755", MS_NOSUID|MS_STRICTATIME, | |
67 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
68 | { "securityfs", "/sys/kernel/security", "securityfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, | |
69 | NULL, MNT_NONE }, | |
f5e65279 | 70 | #if ENABLE_SMACK |
f47781d8 MP |
71 | { "smackfs", "/sys/fs/smackfs", "smackfs", "smackfsdef=*", MS_NOSUID|MS_NOEXEC|MS_NODEV, |
72 | mac_smack_use, MNT_FATAL }, | |
73 | { "tmpfs", "/dev/shm", "tmpfs", "mode=1777,smackfsroot=*", MS_NOSUID|MS_NODEV|MS_STRICTATIME, | |
74 | mac_smack_use, MNT_FATAL }, | |
60f067b4 | 75 | #endif |
f47781d8 MP |
76 | { "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME, |
77 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
78 | { "devpts", "/dev/pts", "devpts", "mode=620,gid=" STRINGIFY(TTY_GID), MS_NOSUID|MS_NOEXEC, | |
79 | NULL, MNT_IN_CONTAINER }, | |
f5e65279 | 80 | #if ENABLE_SMACK |
f47781d8 MP |
81 | { "tmpfs", "/run", "tmpfs", "mode=755,smackfsroot=*", MS_NOSUID|MS_NODEV|MS_STRICTATIME, |
82 | mac_smack_use, MNT_FATAL }, | |
60f067b4 | 83 | #endif |
f47781d8 MP |
84 | { "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME, |
85 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
98393f85 | 86 | { "cgroup2", "/sys/fs/cgroup", "cgroup2", "nsdelegate", MS_NOSUID|MS_NOEXEC|MS_NODEV, |
52ad194e | 87 | cg_is_unified_wanted, MNT_IN_CONTAINER|MNT_CHECK_WRITABLE }, |
98393f85 | 88 | { "cgroup2", "/sys/fs/cgroup", "cgroup2", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
52ad194e | 89 | cg_is_unified_wanted, MNT_IN_CONTAINER|MNT_CHECK_WRITABLE }, |
f47781d8 | 90 | { "tmpfs", "/sys/fs/cgroup", "tmpfs", "mode=755", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME, |
d9dfd233 | 91 | cg_is_legacy_wanted, MNT_FATAL|MNT_IN_CONTAINER }, |
98393f85 | 92 | { "cgroup2", "/sys/fs/cgroup/unified", "cgroup2", "nsdelegate", MS_NOSUID|MS_NOEXEC|MS_NODEV, |
52ad194e | 93 | cg_is_hybrid_wanted, MNT_IN_CONTAINER|MNT_CHECK_WRITABLE }, |
98393f85 | 94 | { "cgroup2", "/sys/fs/cgroup/unified", "cgroup2", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
52ad194e | 95 | cg_is_hybrid_wanted, MNT_IN_CONTAINER|MNT_CHECK_WRITABLE }, |
f47781d8 | 96 | { "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd,xattr", MS_NOSUID|MS_NOEXEC|MS_NODEV, |
2897b343 | 97 | cg_is_legacy_wanted, MNT_IN_CONTAINER }, |
f47781d8 | 98 | { "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd", MS_NOSUID|MS_NOEXEC|MS_NODEV, |
2897b343 | 99 | cg_is_legacy_wanted, MNT_FATAL|MNT_IN_CONTAINER }, |
f47781d8 MP |
100 | { "pstore", "/sys/fs/pstore", "pstore", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
101 | NULL, MNT_NONE }, | |
f5e65279 | 102 | #if ENABLE_EFI |
f47781d8 MP |
103 | { "efivarfs", "/sys/firmware/efi/efivars", "efivarfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
104 | is_efi_boot, MNT_NONE }, | |
105 | #endif | |
98393f85 MB |
106 | { "bpf", "/sys/fs/bpf", "bpf", "mode=700", MS_NOSUID|MS_NOEXEC|MS_NODEV, |
107 | NULL, MNT_NONE, }, | |
663996b3 MS |
108 | }; |
109 | ||
110 | /* These are API file systems that might be mounted by other software, | |
111 | * we just list them here so that we know that we should ignore them */ | |
112 | ||
113 | static const char ignore_paths[] = | |
114 | /* SELinux file systems */ | |
115 | "/sys/fs/selinux\0" | |
663996b3 MS |
116 | /* Container bind mounts */ |
117 | "/proc/sys\0" | |
118 | "/dev/console\0" | |
119 | "/proc/kmsg\0"; | |
120 | ||
121 | bool mount_point_is_api(const char *path) { | |
122 | unsigned i; | |
123 | ||
124 | /* Checks if this mount point is considered "API", and hence | |
125 | * should be ignored */ | |
126 | ||
127 | for (i = 0; i < ELEMENTSOF(mount_table); i ++) | |
128 | if (path_equal(path, mount_table[i].where)) | |
129 | return true; | |
130 | ||
131 | return path_startswith(path, "/sys/fs/cgroup/"); | |
132 | } | |
133 | ||
134 | bool mount_point_ignore(const char *path) { | |
135 | const char *i; | |
136 | ||
137 | NULSTR_FOREACH(i, ignore_paths) | |
138 | if (path_equal(path, i)) | |
139 | return true; | |
140 | ||
141 | return false; | |
142 | } | |
143 | ||
144 | static int mount_one(const MountPoint *p, bool relabel) { | |
1d42b86d | 145 | int r, priority; |
663996b3 MS |
146 | |
147 | assert(p); | |
148 | ||
1d42b86d MB |
149 | priority = (p->mode & MNT_FATAL) ? LOG_ERR : LOG_DEBUG; |
150 | ||
663996b3 MS |
151 | if (p->condition_fn && !p->condition_fn()) |
152 | return 0; | |
153 | ||
154 | /* Relabel first, just in case */ | |
155 | if (relabel) | |
b012e921 | 156 | (void) label_fix(p->where, LABEL_IGNORE_ENOENT|LABEL_IGNORE_EROFS); |
663996b3 | 157 | |
2897b343 | 158 | r = path_is_mount_point(p->where, NULL, AT_SYMLINK_FOLLOW); |
4c89c718 | 159 | if (r < 0 && r != -ENOENT) { |
1d42b86d | 160 | log_full_errno(priority, r, "Failed to determine whether %s is a mount point: %m", p->where); |
4c89c718 MP |
161 | return (p->mode & MNT_FATAL) ? r : 0; |
162 | } | |
663996b3 MS |
163 | if (r > 0) |
164 | return 0; | |
165 | ||
166 | /* Skip securityfs in a container */ | |
6300502b | 167 | if (!(p->mode & MNT_IN_CONTAINER) && detect_container() > 0) |
663996b3 MS |
168 | return 0; |
169 | ||
170 | /* The access mode here doesn't really matter too much, since | |
171 | * the mounted file system will take precedence anyway. */ | |
60f067b4 | 172 | if (relabel) |
4c89c718 | 173 | (void) mkdir_p_label(p->where, 0755); |
60f067b4 | 174 | else |
4c89c718 | 175 | (void) mkdir_p(p->where, 0755); |
663996b3 MS |
176 | |
177 | log_debug("Mounting %s to %s of type %s with options %s.", | |
178 | p->what, | |
179 | p->where, | |
180 | p->type, | |
181 | strna(p->options)); | |
182 | ||
183 | if (mount(p->what, | |
184 | p->where, | |
185 | p->type, | |
186 | p->flags, | |
187 | p->options) < 0) { | |
1d42b86d | 188 | log_full_errno(priority, errno, "Failed to mount %s at %s: %m", p->type, p->where); |
663996b3 MS |
189 | return (p->mode & MNT_FATAL) ? -errno : 0; |
190 | } | |
191 | ||
192 | /* Relabel again, since we now mounted something fresh here */ | |
193 | if (relabel) | |
b012e921 | 194 | (void) label_fix(p->where, 0); |
663996b3 | 195 | |
52ad194e | 196 | if (p->mode & MNT_CHECK_WRITABLE) { |
1d42b86d MB |
197 | if (access(p->where, W_OK) < 0) { |
198 | r = -errno; | |
199 | ||
52ad194e MB |
200 | (void) umount(p->where); |
201 | (void) rmdir(p->where); | |
1d42b86d MB |
202 | |
203 | log_full_errno(priority, r, "Mount point %s not writable after mounting: %m", p->where); | |
52ad194e MB |
204 | return (p->mode & MNT_FATAL) ? r : 0; |
205 | } | |
206 | } | |
207 | ||
663996b3 MS |
208 | return 1; |
209 | } | |
210 | ||
4c89c718 | 211 | static int mount_points_setup(unsigned n, bool loaded_policy) { |
663996b3 MS |
212 | unsigned i; |
213 | int r = 0; | |
214 | ||
4c89c718 | 215 | for (i = 0; i < n; i ++) { |
663996b3 MS |
216 | int j; |
217 | ||
4c89c718 | 218 | j = mount_one(mount_table + i, loaded_policy); |
6300502b | 219 | if (j != 0 && r >= 0) |
663996b3 MS |
220 | r = j; |
221 | } | |
222 | ||
223 | return r; | |
224 | } | |
225 | ||
4c89c718 MP |
226 | int mount_setup_early(void) { |
227 | assert_cc(N_EARLY_MOUNT <= ELEMENTSOF(mount_table)); | |
228 | ||
229 | /* Do a minimal mount of /proc and friends to enable the most | |
230 | * basic stuff, such as SELinux */ | |
231 | return mount_points_setup(N_EARLY_MOUNT, false); | |
232 | } | |
233 | ||
6e866b33 MB |
234 | static const char *join_with(const char *controller) { |
235 | ||
236 | static const char* const pairs[] = { | |
237 | "cpu", "cpuacct", | |
238 | "net_cls", "net_prio", | |
239 | NULL | |
240 | }; | |
241 | ||
242 | const char *const *x, *const *y; | |
243 | ||
244 | assert(controller); | |
245 | ||
246 | /* This will lookup which controller to mount another controller with. Input is a controller name, and output | |
247 | * is the other controller name. The function works both ways: you can input one and get the other, and input | |
248 | * the other to get the one. */ | |
249 | ||
250 | STRV_FOREACH_PAIR(x, y, pairs) { | |
251 | if (streq(controller, *x)) | |
252 | return *y; | |
253 | if (streq(controller, *y)) | |
254 | return *x; | |
255 | } | |
256 | ||
257 | return NULL; | |
258 | } | |
259 | ||
260 | static int symlink_controller(const char *target, const char *alias) { | |
261 | const char *a; | |
262 | int r; | |
263 | ||
264 | assert(target); | |
265 | assert(alias); | |
266 | ||
267 | a = strjoina("/sys/fs/cgroup/", alias); | |
268 | ||
269 | r = symlink_idempotent(target, a, false); | |
270 | if (r < 0) | |
271 | return log_error_errno(r, "Failed to create symlink %s: %m", a); | |
272 | ||
273 | #ifdef SMACK_RUN_LABEL | |
274 | const char *p; | |
275 | ||
276 | p = strjoina("/sys/fs/cgroup/", target); | |
277 | ||
278 | r = mac_smack_copy(a, p); | |
279 | if (r < 0 && r != -EOPNOTSUPP) | |
280 | return log_error_errno(r, "Failed to copy smack label from %s to %s: %m", p, a); | |
281 | #endif | |
282 | ||
283 | return 0; | |
284 | } | |
285 | ||
286 | int mount_cgroup_controllers(void) { | |
663996b3 | 287 | _cleanup_set_free_free_ Set *controllers = NULL; |
60f067b4 | 288 | int r; |
663996b3 | 289 | |
d9dfd233 MP |
290 | if (!cg_is_legacy_wanted()) |
291 | return 0; | |
292 | ||
663996b3 | 293 | /* Mount all available cgroup controllers that are built into the kernel. */ |
52ad194e | 294 | r = cg_kernel_controllers(&controllers); |
e735f4d4 MP |
295 | if (r < 0) |
296 | return log_error_errno(r, "Failed to enumerate cgroup controllers: %m"); | |
663996b3 MS |
297 | |
298 | for (;;) { | |
60f067b4 | 299 | _cleanup_free_ char *options = NULL, *controller = NULL, *where = NULL; |
6e866b33 | 300 | const char *other_controller; |
663996b3 MS |
301 | MountPoint p = { |
302 | .what = "cgroup", | |
303 | .type = "cgroup", | |
304 | .flags = MS_NOSUID|MS_NOEXEC|MS_NODEV, | |
305 | .mode = MNT_IN_CONTAINER, | |
306 | }; | |
663996b3 MS |
307 | |
308 | controller = set_steal_first(controllers); | |
309 | if (!controller) | |
310 | break; | |
311 | ||
6e866b33 MB |
312 | /* Check if we shall mount this together with another controller */ |
313 | other_controller = join_with(controller); | |
314 | if (other_controller) { | |
315 | _cleanup_free_ char *c = NULL; | |
316 | ||
317 | /* Check if the other controller is actually available in the kernel too */ | |
318 | c = set_remove(controllers, other_controller); | |
319 | if (c) { | |
320 | ||
321 | /* Join the two controllers into one string, and maintain a stable ordering */ | |
322 | if (strcmp(controller, other_controller) < 0) | |
323 | options = strjoin(controller, ",", other_controller); | |
324 | else | |
325 | options = strjoin(other_controller, ",", controller); | |
326 | if (!options) | |
327 | return log_oom(); | |
663996b3 | 328 | } |
6e866b33 | 329 | } |
663996b3 | 330 | |
6e866b33 MB |
331 | /* The simple case, where there's only one controller to mount together */ |
332 | if (!options) | |
b012e921 | 333 | options = TAKE_PTR(controller); |
663996b3 | 334 | |
60f067b4 JS |
335 | where = strappend("/sys/fs/cgroup/", options); |
336 | if (!where) | |
337 | return log_oom(); | |
338 | ||
339 | p.where = where; | |
663996b3 MS |
340 | p.options = options; |
341 | ||
342 | r = mount_one(&p, true); | |
343 | if (r < 0) | |
344 | return r; | |
345 | ||
6e866b33 MB |
346 | /* Create symlinks from the individual controller names, in case we have a joined mount */ |
347 | if (controller) | |
348 | (void) symlink_controller(options, controller); | |
349 | if (other_controller) | |
350 | (void) symlink_controller(options, other_controller); | |
663996b3 MS |
351 | } |
352 | ||
6e866b33 | 353 | /* Now that we mounted everything, let's make the tmpfs the cgroup file systems are mounted into read-only. */ |
e735f4d4 | 354 | (void) mount("tmpfs", "/sys/fs/cgroup", "tmpfs", MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME|MS_RDONLY, "mode=755"); |
60f067b4 | 355 | |
663996b3 MS |
356 | return 0; |
357 | } | |
358 | ||
f5e65279 | 359 | #if HAVE_SELINUX || ENABLE_SMACK |
663996b3 MS |
360 | static int nftw_cb( |
361 | const char *fpath, | |
362 | const struct stat *sb, | |
363 | int tflag, | |
364 | struct FTW *ftwbuf) { | |
365 | ||
366 | /* No need to label /dev twice in a row... */ | |
367 | if (_unlikely_(ftwbuf->level == 0)) | |
368 | return FTW_CONTINUE; | |
369 | ||
b012e921 | 370 | (void) label_fix(fpath, 0); |
663996b3 MS |
371 | |
372 | /* /run/initramfs is static data and big, no need to | |
373 | * dynamically relabel its contents at boot... */ | |
374 | if (_unlikely_(ftwbuf->level == 1 && | |
375 | tflag == FTW_D && | |
376 | streq(fpath, "/run/initramfs"))) | |
377 | return FTW_SKIP_SUBTREE; | |
378 | ||
379 | return FTW_CONTINUE; | |
380 | }; | |
b012e921 MB |
381 | |
382 | static int relabel_cgroup_filesystems(void) { | |
383 | int r; | |
384 | struct statfs st; | |
385 | ||
386 | r = cg_all_unified(); | |
387 | if (r == 0) { | |
388 | /* Temporarily remount the root cgroup filesystem to give it a proper label. Do this | |
389 | only when the filesystem has been already populated by a previous instance of systemd | |
390 | running from initrd. Otherwise don't remount anything and leave the filesystem read-write | |
391 | for the cgroup filesystems to be mounted inside. */ | |
392 | if (statfs("/sys/fs/cgroup", &st) < 0) | |
393 | return log_error_errno(errno, "Failed to determine mount flags for /sys/fs/cgroup: %m"); | |
394 | ||
395 | if (st.f_flags & ST_RDONLY) | |
396 | (void) mount(NULL, "/sys/fs/cgroup", NULL, MS_REMOUNT, NULL); | |
397 | ||
398 | (void) label_fix("/sys/fs/cgroup", 0); | |
399 | (void) nftw("/sys/fs/cgroup", nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL); | |
400 | ||
401 | if (st.f_flags & ST_RDONLY) | |
402 | (void) mount(NULL, "/sys/fs/cgroup", NULL, MS_REMOUNT|MS_RDONLY, NULL); | |
403 | ||
404 | } else if (r < 0) | |
405 | return log_error_errno(r, "Failed to determine whether we are in all unified mode: %m"); | |
406 | ||
407 | return 0; | |
408 | } | |
6e866b33 MB |
409 | |
410 | static int relabel_extra(void) { | |
411 | _cleanup_closedir_ DIR *d = NULL; | |
412 | int r, c = 0; | |
413 | ||
414 | /* Support for relabelling additional files or directories after loading the policy. For this, code in the | |
415 | * initrd simply has to drop in *.relabel files into /run/systemd/relabel-extra.d/. We'll read all such files | |
416 | * expecting one absolute path by line and will relabel each (and everyone below that in case the path refers | |
417 | * to a directory). These drop-in files are supposed to be absolutely minimal, and do not understand comments | |
418 | * and such. After the operation succeeded the files are removed, and the drop-in directory as well, if | |
419 | * possible. | |
420 | */ | |
421 | ||
422 | d = opendir("/run/systemd/relabel-extra.d/"); | |
423 | if (!d) { | |
424 | if (errno == ENOENT) | |
425 | return 0; | |
426 | ||
427 | return log_warning_errno(errno, "Failed to open /run/systemd/relabel-extra.d/, ignoring: %m"); | |
428 | } | |
429 | ||
430 | for (;;) { | |
431 | _cleanup_fclose_ FILE *f = NULL; | |
432 | _cleanup_close_ int fd = -1; | |
433 | struct dirent *de; | |
434 | ||
435 | errno = 0; | |
436 | de = readdir_no_dot(d); | |
437 | if (!de) { | |
438 | if (errno != 0) | |
439 | return log_error_errno(errno, "Failed read directory /run/systemd/relabel-extra.d/, ignoring: %m"); | |
440 | break; | |
441 | } | |
442 | ||
443 | if (hidden_or_backup_file(de->d_name)) | |
444 | continue; | |
445 | ||
446 | if (!endswith(de->d_name, ".relabel")) | |
447 | continue; | |
448 | ||
449 | if (!IN_SET(de->d_type, DT_REG, DT_UNKNOWN)) | |
450 | continue; | |
451 | ||
452 | fd = openat(dirfd(d), de->d_name, O_RDONLY|O_CLOEXEC|O_NONBLOCK); | |
453 | if (fd < 0) { | |
454 | log_warning_errno(errno, "Failed to open /run/systemd/relabel-extra.d/%s, ignoring: %m", de->d_name); | |
455 | continue; | |
456 | } | |
457 | ||
458 | f = fdopen(fd, "r"); | |
459 | if (!f) { | |
460 | log_warning_errno(errno, "Failed to convert file descriptor into file object, ignoring: %m"); | |
461 | continue; | |
462 | } | |
463 | TAKE_FD(fd); | |
464 | ||
465 | for (;;) { | |
466 | _cleanup_free_ char *line = NULL; | |
467 | ||
468 | r = read_line(f, LONG_LINE_MAX, &line); | |
469 | if (r < 0) { | |
470 | log_warning_errno(r, "Failed to read from /run/systemd/relabel-extra.d/%s, ignoring: %m", de->d_name); | |
471 | break; | |
472 | } | |
473 | if (r == 0) /* EOF */ | |
474 | break; | |
475 | ||
476 | path_simplify(line, true); | |
477 | ||
478 | if (!path_is_normalized(line)) { | |
479 | log_warning("Path to relabel is not normalized, ignoring: %s", line); | |
480 | continue; | |
481 | } | |
482 | ||
483 | if (!path_is_absolute(line)) { | |
484 | log_warning("Path to relabel is not absolute, ignoring: %s", line); | |
485 | continue; | |
486 | } | |
487 | ||
488 | log_debug("Relabelling additional file/directory '%s'.", line); | |
489 | (void) nftw(line, nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL); | |
490 | c++; | |
491 | } | |
492 | ||
493 | if (unlinkat(dirfd(d), de->d_name, 0) < 0) | |
494 | log_warning_errno(errno, "Failed to remove /run/systemd/relabel-extra.d/%s, ignoring: %m", de->d_name); | |
495 | } | |
496 | ||
497 | /* Remove when we completing things. */ | |
498 | if (rmdir("/run/systemd/relabel-extra.d") < 0) | |
499 | log_warning_errno(errno, "Failed to remove /run/systemd/relabel-extra.d/ directory: %m"); | |
500 | ||
501 | return c; | |
502 | } | |
5eef597e | 503 | #endif |
663996b3 MS |
504 | |
505 | int mount_setup(bool loaded_policy) { | |
f47781d8 | 506 | int r = 0; |
663996b3 | 507 | |
4c89c718 | 508 | r = mount_points_setup(ELEMENTSOF(mount_table), loaded_policy); |
f47781d8 MP |
509 | if (r < 0) |
510 | return r; | |
511 | ||
f5e65279 | 512 | #if HAVE_SELINUX || ENABLE_SMACK |
663996b3 MS |
513 | /* Nodes in devtmpfs and /run need to be manually updated for |
514 | * the appropriate labels, after mounting. The other virtual | |
515 | * API file systems like /sys and /proc do not need that, they | |
516 | * use the same label for all their files. */ | |
517 | if (loaded_policy) { | |
518 | usec_t before_relabel, after_relabel; | |
519 | char timespan[FORMAT_TIMESPAN_MAX]; | |
6e866b33 MB |
520 | const char *i; |
521 | int n_extra; | |
663996b3 MS |
522 | |
523 | before_relabel = now(CLOCK_MONOTONIC); | |
524 | ||
6e866b33 MB |
525 | FOREACH_STRING(i, "/dev", "/dev/shm", "/run") |
526 | (void) nftw(i, nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL); | |
663996b3 | 527 | |
6e866b33 MB |
528 | (void) relabel_cgroup_filesystems(); |
529 | ||
530 | n_extra = relabel_extra(); | |
52ad194e | 531 | |
663996b3 MS |
532 | after_relabel = now(CLOCK_MONOTONIC); |
533 | ||
6e866b33 MB |
534 | log_info("Relabelled /dev, /dev/shm, /run, /sys/fs/cgroup%s in %s.", |
535 | n_extra > 0 ? ", additional files" : "", | |
663996b3 MS |
536 | format_timespan(timespan, sizeof(timespan), after_relabel - before_relabel, 0)); |
537 | } | |
5eef597e | 538 | #endif |
663996b3 MS |
539 | |
540 | /* Create a few default symlinks, which are normally created | |
541 | * by udevd, but some scripts might need them before we start | |
542 | * udevd. */ | |
e3bff60a | 543 | dev_setup(NULL, UID_INVALID, GID_INVALID); |
663996b3 | 544 | |
2897b343 MP |
545 | /* Mark the root directory as shared in regards to mount propagation. The kernel defaults to "private", but we |
546 | * think it makes more sense to have a default of "shared" so that nspawn and the container tools work out of | |
547 | * the box. If specific setups need other settings they can reset the propagation mode to private if | |
548 | * needed. Note that we set this only when we are invoked directly by the kernel. If we are invoked by a | |
549 | * container manager we assume the container manager knows what it is doing (for example, because it set up | |
550 | * some directories with different propagation modes). */ | |
6300502b | 551 | if (detect_container() <= 0) |
663996b3 | 552 | if (mount(NULL, "/", NULL, MS_REC|MS_SHARED, NULL) < 0) |
f47781d8 | 553 | log_warning_errno(errno, "Failed to set up the root directory for shared mount propagation: %m"); |
663996b3 | 554 | |
2897b343 MP |
555 | /* Create a few directories we always want around, Note that sd_booted() checks for /run/systemd/system, so |
556 | * this mkdir really needs to stay for good, otherwise software that copied sd-daemon.c into their sources will | |
557 | * misdetect systemd. */ | |
5a920b42 MP |
558 | (void) mkdir_label("/run/systemd", 0755); |
559 | (void) mkdir_label("/run/systemd/system", 0755); | |
2897b343 | 560 | |
6e866b33 MB |
561 | /* Also create /run/systemd/inaccessible nodes, so that we always have something to mount inaccessible nodes |
562 | * from. */ | |
563 | (void) make_inaccessible_nodes(NULL, UID_INVALID, GID_INVALID); | |
b012e921 | 564 | |
663996b3 MS |
565 | return 0; |
566 | } |