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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
8e274523 | 2 | |
8e274523 | 3 | #include <errno.h> |
cf0fbc49 | 4 | #include <ftw.h> |
8e274523 | 5 | #include <stdlib.h> |
cf0fbc49 | 6 | #include <sys/mount.h> |
6f7729c1 | 7 | #include <sys/statvfs.h> |
5c0532d1 | 8 | #include <unistd.h> |
8e274523 | 9 | |
b5efdb8a | 10 | #include "alloc-util.h" |
64824462 | 11 | #include "bus-util.h" |
4349cd7c LP |
12 | #include "cgroup-util.h" |
13 | #include "dev-setup.h" | |
14 | #include "efivars.h" | |
e07aefbd | 15 | #include "fileio.h" |
c4b41707 | 16 | #include "fs-util.h" |
4349cd7c | 17 | #include "label.h" |
8e274523 | 18 | #include "log.h" |
c9af1080 | 19 | #include "macro.h" |
4349cd7c | 20 | #include "missing.h" |
49e942b2 | 21 | #include "mkdir.h" |
4349cd7c | 22 | #include "mount-setup.h" |
049af8ad | 23 | #include "mountpoint-util.h" |
9eb977db | 24 | #include "path-util.h" |
4349cd7c | 25 | #include "set.h" |
8552b176 | 26 | #include "smack-util.h" |
4349cd7c | 27 | #include "strv.h" |
ee104e11 | 28 | #include "user-util.h" |
4349cd7c LP |
29 | #include "util.h" |
30 | #include "virt.h" | |
bef2733f | 31 | |
6aa220e0 | 32 | typedef enum MountMode { |
ef31828d LP |
33 | MNT_NONE = 0, |
34 | MNT_FATAL = 1 << 0, | |
35 | MNT_IN_CONTAINER = 1 << 1, | |
36 | MNT_CHECK_WRITABLE = 1 << 2, | |
6aa220e0 KS |
37 | } MountMode; |
38 | ||
ca714c0e LP |
39 | typedef struct MountPoint { |
40 | const char *what; | |
41 | const char *where; | |
42 | const char *type; | |
43 | const char *options; | |
44 | unsigned long flags; | |
6aa220e0 KS |
45 | bool (*condition_fn)(void); |
46 | MountMode mode; | |
ca714c0e LP |
47 | } MountPoint; |
48 | ||
4ef31082 | 49 | /* The first three entries we might need before SELinux is up. The |
160481f6 | 50 | * fourth (securityfs) is needed by IMA to load a custom policy. The |
7c96ab1d LP |
51 | * other ones we can delay until SELinux and IMA are loaded. When |
52 | * SMACK is enabled we need smackfs, too, so it's a fifth one. */ | |
f9fa32f0 | 53 | #if ENABLE_SMACK |
ffbd2c4d | 54 | #define N_EARLY_MOUNT 5 |
7c96ab1d LP |
55 | #else |
56 | #define N_EARLY_MOUNT 4 | |
57 | #endif | |
4ef31082 | 58 | |
ca714c0e | 59 | static const MountPoint mount_table[] = { |
68d4c452 LP |
60 | { "sysfs", "/sys", "sysfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
61 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
62 | { "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, | |
63 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
64 | { "devtmpfs", "/dev", "devtmpfs", "mode=755", MS_NOSUID|MS_STRICTATIME, | |
65 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
66 | { "securityfs", "/sys/kernel/security", "securityfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, | |
67 | NULL, MNT_NONE }, | |
f9fa32f0 | 68 | #if ENABLE_SMACK |
68d4c452 LP |
69 | { "smackfs", "/sys/fs/smackfs", "smackfs", "smackfsdef=*", MS_NOSUID|MS_NOEXEC|MS_NODEV, |
70 | mac_smack_use, MNT_FATAL }, | |
71 | { "tmpfs", "/dev/shm", "tmpfs", "mode=1777,smackfsroot=*", MS_NOSUID|MS_NODEV|MS_STRICTATIME, | |
72 | mac_smack_use, MNT_FATAL }, | |
d407c940 | 73 | #endif |
68d4c452 LP |
74 | { "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME, |
75 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
76 | { "devpts", "/dev/pts", "devpts", "mode=620,gid=" STRINGIFY(TTY_GID), MS_NOSUID|MS_NOEXEC, | |
77 | NULL, MNT_IN_CONTAINER }, | |
f9fa32f0 | 78 | #if ENABLE_SMACK |
68d4c452 LP |
79 | { "tmpfs", "/run", "tmpfs", "mode=755,smackfsroot=*", MS_NOSUID|MS_NODEV|MS_STRICTATIME, |
80 | mac_smack_use, MNT_FATAL }, | |
d407c940 | 81 | #endif |
68d4c452 LP |
82 | { "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME, |
83 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
65900808 | 84 | { "cgroup2", "/sys/fs/cgroup", "cgroup2", "nsdelegate", MS_NOSUID|MS_NOEXEC|MS_NODEV, |
2d56b80a | 85 | cg_is_unified_wanted, MNT_IN_CONTAINER|MNT_CHECK_WRITABLE }, |
65900808 | 86 | { "cgroup2", "/sys/fs/cgroup", "cgroup2", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
2d56b80a | 87 | cg_is_unified_wanted, MNT_IN_CONTAINER|MNT_CHECK_WRITABLE }, |
68d4c452 | 88 | { "tmpfs", "/sys/fs/cgroup", "tmpfs", "mode=755", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME, |
efdb0237 | 89 | cg_is_legacy_wanted, MNT_FATAL|MNT_IN_CONTAINER }, |
65900808 | 90 | { "cgroup2", "/sys/fs/cgroup/unified", "cgroup2", "nsdelegate", MS_NOSUID|MS_NOEXEC|MS_NODEV, |
e07aefbd | 91 | cg_is_hybrid_wanted, MNT_IN_CONTAINER|MNT_CHECK_WRITABLE }, |
65900808 | 92 | { "cgroup2", "/sys/fs/cgroup/unified", "cgroup2", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
e07aefbd | 93 | cg_is_hybrid_wanted, MNT_IN_CONTAINER|MNT_CHECK_WRITABLE }, |
68d4c452 | 94 | { "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd,xattr", MS_NOSUID|MS_NOEXEC|MS_NODEV, |
2977724b | 95 | cg_is_legacy_wanted, MNT_IN_CONTAINER }, |
68d4c452 | 96 | { "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd", MS_NOSUID|MS_NOEXEC|MS_NODEV, |
2977724b | 97 | cg_is_legacy_wanted, MNT_FATAL|MNT_IN_CONTAINER }, |
68d4c452 LP |
98 | { "pstore", "/sys/fs/pstore", "pstore", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
99 | NULL, MNT_NONE }, | |
349cc4a5 | 100 | #if ENABLE_EFI |
68d4c452 LP |
101 | { "efivarfs", "/sys/firmware/efi/efivars", "efivarfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
102 | is_efi_boot, MNT_NONE }, | |
c06bf414 | 103 | #endif |
39f305a9 | 104 | { "bpf", "/sys/fs/bpf", "bpf", "mode=700", MS_NOSUID|MS_NOEXEC|MS_NODEV, |
43b7f24b | 105 | NULL, MNT_NONE, }, |
63cc4c31 DM |
106 | }; |
107 | ||
949c6510 | 108 | /* These are API file systems that might be mounted by other software, |
46ff0ed7 | 109 | * we just list them here so that we know that we should ignore them */ |
949c6510 | 110 | |
eaeb18db LP |
111 | static const char ignore_paths[] = |
112 | /* SELinux file systems */ | |
113 | "/sys/fs/selinux\0" | |
eaeb18db LP |
114 | /* Container bind mounts */ |
115 | "/proc/sys\0" | |
116 | "/dev/console\0" | |
c481f78b | 117 | "/proc/kmsg\0"; |
949c6510 | 118 | |
dad08730 LP |
119 | bool mount_point_is_api(const char *path) { |
120 | unsigned i; | |
121 | ||
122 | /* Checks if this mount point is considered "API", and hence | |
123 | * should be ignored */ | |
124 | ||
ca714c0e | 125 | for (i = 0; i < ELEMENTSOF(mount_table); i ++) |
449ddb2d | 126 | if (path_equal(path, mount_table[i].where)) |
dad08730 LP |
127 | return true; |
128 | ||
57f2a956 KS |
129 | return path_startswith(path, "/sys/fs/cgroup/"); |
130 | } | |
131 | ||
132 | bool mount_point_ignore(const char *path) { | |
eaeb18db | 133 | const char *i; |
57f2a956 | 134 | |
eaeb18db LP |
135 | NULSTR_FOREACH(i, ignore_paths) |
136 | if (path_equal(path, i)) | |
949c6510 LP |
137 | return true; |
138 | ||
57f2a956 | 139 | return false; |
dad08730 LP |
140 | } |
141 | ||
4ef31082 | 142 | static int mount_one(const MountPoint *p, bool relabel) { |
713a8875 | 143 | int r, priority; |
8e274523 | 144 | |
ca714c0e | 145 | assert(p); |
8e274523 | 146 | |
713a8875 LP |
147 | priority = (p->mode & MNT_FATAL) ? LOG_ERR : LOG_DEBUG; |
148 | ||
6aa220e0 KS |
149 | if (p->condition_fn && !p->condition_fn()) |
150 | return 0; | |
151 | ||
51b4af2c | 152 | /* Relabel first, just in case */ |
4ef31082 | 153 | if (relabel) |
08c84981 | 154 | (void) label_fix(p->where, LABEL_IGNORE_ENOENT|LABEL_IGNORE_EROFS); |
51b4af2c | 155 | |
e1873695 | 156 | r = path_is_mount_point(p->where, NULL, AT_SYMLINK_FOLLOW); |
1411b094 | 157 | if (r < 0 && r != -ENOENT) { |
713a8875 | 158 | log_full_errno(priority, r, "Failed to determine whether %s is a mount point: %m", p->where); |
1411b094 LP |
159 | return (p->mode & MNT_FATAL) ? r : 0; |
160 | } | |
8e274523 | 161 | if (r > 0) |
51b4af2c | 162 | return 0; |
8e274523 | 163 | |
c481f78b | 164 | /* Skip securityfs in a container */ |
75f86906 | 165 | if (!(p->mode & MNT_IN_CONTAINER) && detect_container() > 0) |
c481f78b LP |
166 | return 0; |
167 | ||
a04f58d6 LP |
168 | /* The access mode here doesn't really matter too much, since |
169 | * the mounted file system will take precedence anyway. */ | |
c4bfd169 | 170 | if (relabel) |
1411b094 | 171 | (void) mkdir_p_label(p->where, 0755); |
c4bfd169 | 172 | else |
1411b094 | 173 | (void) mkdir_p(p->where, 0755); |
a04f58d6 | 174 | |
8e274523 | 175 | log_debug("Mounting %s to %s of type %s with options %s.", |
ca714c0e LP |
176 | p->what, |
177 | p->where, | |
178 | p->type, | |
179 | strna(p->options)); | |
180 | ||
181 | if (mount(p->what, | |
182 | p->where, | |
183 | p->type, | |
184 | p->flags, | |
185 | p->options) < 0) { | |
713a8875 | 186 | log_full_errno(priority, errno, "Failed to mount %s at %s: %m", p->type, p->where); |
6aa220e0 | 187 | return (p->mode & MNT_FATAL) ? -errno : 0; |
8e274523 LP |
188 | } |
189 | ||
51b4af2c | 190 | /* Relabel again, since we now mounted something fresh here */ |
4ef31082 | 191 | if (relabel) |
08c84981 | 192 | (void) label_fix(p->where, 0); |
5275d3c1 | 193 | |
e07aefbd | 194 | if (p->mode & MNT_CHECK_WRITABLE) { |
713a8875 LP |
195 | if (access(p->where, W_OK) < 0) { |
196 | r = -errno; | |
197 | ||
e07aefbd | 198 | (void) umount(p->where); |
1ff654e2 | 199 | (void) rmdir(p->where); |
713a8875 LP |
200 | |
201 | log_full_errno(priority, r, "Mount point %s not writable after mounting: %m", p->where); | |
e07aefbd CB |
202 | return (p->mode & MNT_FATAL) ? r : 0; |
203 | } | |
204 | } | |
205 | ||
0c85a4f3 | 206 | return 1; |
8e274523 LP |
207 | } |
208 | ||
400fac06 | 209 | static int mount_points_setup(unsigned n, bool loaded_policy) { |
4ef31082 LP |
210 | unsigned i; |
211 | int r = 0; | |
212 | ||
400fac06 | 213 | for (i = 0; i < n; i ++) { |
4ef31082 LP |
214 | int j; |
215 | ||
400fac06 | 216 | j = mount_one(mount_table + i, loaded_policy); |
7ff307bc | 217 | if (j != 0 && r >= 0) |
4ef31082 LP |
218 | r = j; |
219 | } | |
220 | ||
221 | return r; | |
222 | } | |
223 | ||
400fac06 AK |
224 | int mount_setup_early(void) { |
225 | assert_cc(N_EARLY_MOUNT <= ELEMENTSOF(mount_table)); | |
226 | ||
227 | /* Do a minimal mount of /proc and friends to enable the most | |
228 | * basic stuff, such as SELinux */ | |
229 | return mount_points_setup(N_EARLY_MOUNT, false); | |
230 | } | |
231 | ||
143fadf3 LP |
232 | static const char *join_with(const char *controller) { |
233 | ||
234 | static const char* const pairs[] = { | |
235 | "cpu", "cpuacct", | |
236 | "net_cls", "net_prio", | |
237 | NULL | |
238 | }; | |
239 | ||
240 | const char *const *x, *const *y; | |
241 | ||
242 | assert(controller); | |
243 | ||
244 | /* This will lookup which controller to mount another controller with. Input is a controller name, and output | |
245 | * is the other controller name. The function works both ways: you can input one and get the other, and input | |
246 | * the other to get the one. */ | |
247 | ||
248 | STRV_FOREACH_PAIR(x, y, pairs) { | |
249 | if (streq(controller, *x)) | |
250 | return *y; | |
251 | if (streq(controller, *y)) | |
252 | return *x; | |
253 | } | |
254 | ||
255 | return NULL; | |
256 | } | |
257 | ||
258 | static int symlink_controller(const char *target, const char *alias) { | |
259 | const char *a; | |
260 | int r; | |
261 | ||
262 | assert(target); | |
263 | assert(alias); | |
264 | ||
265 | a = strjoina("/sys/fs/cgroup/", alias); | |
266 | ||
267 | r = symlink_idempotent(target, a, false); | |
268 | if (r < 0) | |
269 | return log_error_errno(r, "Failed to create symlink %s: %m", a); | |
270 | ||
271 | #ifdef SMACK_RUN_LABEL | |
272 | const char *p; | |
273 | ||
274 | p = strjoina("/sys/fs/cgroup/", target); | |
275 | ||
276 | r = mac_smack_copy(a, p); | |
277 | if (r < 0 && r != -EOPNOTSUPP) | |
278 | return log_error_errno(r, "Failed to copy smack label from %s to %s: %m", p, a); | |
279 | #endif | |
280 | ||
281 | return 0; | |
282 | } | |
283 | ||
284 | int mount_cgroup_controllers(void) { | |
a6b26d90 | 285 | _cleanup_set_free_free_ Set *controllers = NULL; |
a641dcd9 | 286 | int r; |
2076ca54 | 287 | |
efdb0237 LP |
288 | if (!cg_is_legacy_wanted()) |
289 | return 0; | |
290 | ||
670802d4 | 291 | /* Mount all available cgroup controllers that are built into the kernel. */ |
6925a0de | 292 | r = cg_kernel_controllers(&controllers); |
b12afc8c LP |
293 | if (r < 0) |
294 | return log_error_errno(r, "Failed to enumerate cgroup controllers: %m"); | |
0c85a4f3 LP |
295 | |
296 | for (;;) { | |
a641dcd9 | 297 | _cleanup_free_ char *options = NULL, *controller = NULL, *where = NULL; |
143fadf3 | 298 | const char *other_controller; |
a6b26d90 ZJS |
299 | MountPoint p = { |
300 | .what = "cgroup", | |
301 | .type = "cgroup", | |
302 | .flags = MS_NOSUID|MS_NOEXEC|MS_NODEV, | |
303 | .mode = MNT_IN_CONTAINER, | |
304 | }; | |
0c85a4f3 LP |
305 | |
306 | controller = set_steal_first(controllers); | |
307 | if (!controller) | |
308 | break; | |
309 | ||
143fadf3 LP |
310 | /* Check if we shall mount this together with another controller */ |
311 | other_controller = join_with(controller); | |
312 | if (other_controller) { | |
313 | _cleanup_free_ char *c = NULL; | |
314 | ||
315 | /* Check if the other controller is actually available in the kernel too */ | |
316 | c = set_remove(controllers, other_controller); | |
317 | if (c) { | |
318 | ||
319 | /* Join the two controllers into one string, and maintain a stable ordering */ | |
320 | if (strcmp(controller, other_controller) < 0) | |
321 | options = strjoin(controller, ",", other_controller); | |
322 | else | |
323 | options = strjoin(other_controller, ",", controller); | |
324 | if (!options) | |
325 | return log_oom(); | |
0c85a4f3 | 326 | } |
143fadf3 | 327 | } |
0c85a4f3 | 328 | |
143fadf3 LP |
329 | /* The simple case, where there's only one controller to mount together */ |
330 | if (!options) | |
ae2a15bc | 331 | options = TAKE_PTR(controller); |
0c85a4f3 | 332 | |
a641dcd9 LP |
333 | where = strappend("/sys/fs/cgroup/", options); |
334 | if (!where) | |
335 | return log_oom(); | |
336 | ||
337 | p.where = where; | |
0c85a4f3 | 338 | p.options = options; |
2076ca54 | 339 | |
4ef31082 | 340 | r = mount_one(&p, true); |
a6b26d90 ZJS |
341 | if (r < 0) |
342 | return r; | |
0c85a4f3 | 343 | |
143fadf3 LP |
344 | /* Create symlinks from the individual controller names, in case we have a joined mount */ |
345 | if (controller) | |
346 | (void) symlink_controller(options, controller); | |
347 | if (other_controller) | |
348 | (void) symlink_controller(options, other_controller); | |
2076ca54 LP |
349 | } |
350 | ||
143fadf3 | 351 | /* Now that we mounted everything, let's make the tmpfs the cgroup file systems are mounted into read-only. */ |
b12afc8c | 352 | (void) mount("tmpfs", "/sys/fs/cgroup", "tmpfs", MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME|MS_RDONLY, "mode=755"); |
679142ce | 353 | |
a6b26d90 | 354 | return 0; |
2076ca54 LP |
355 | } |
356 | ||
f9fa32f0 | 357 | #if HAVE_SELINUX || ENABLE_SMACK |
1829dc9d LP |
358 | static int nftw_cb( |
359 | const char *fpath, | |
360 | const struct stat *sb, | |
361 | int tflag, | |
362 | struct FTW *ftwbuf) { | |
363 | ||
9fe117ea | 364 | /* No need to label /dev twice in a row... */ |
edb49778 LP |
365 | if (_unlikely_(ftwbuf->level == 0)) |
366 | return FTW_CONTINUE; | |
367 | ||
08c84981 | 368 | (void) label_fix(fpath, 0); |
af65c248 | 369 | |
edb49778 | 370 | /* /run/initramfs is static data and big, no need to |
af65c248 | 371 | * dynamically relabel its contents at boot... */ |
edb49778 LP |
372 | if (_unlikely_(ftwbuf->level == 1 && |
373 | tflag == FTW_D && | |
374 | streq(fpath, "/run/initramfs"))) | |
375 | return FTW_SKIP_SUBTREE; | |
9fe117ea | 376 | |
edb49778 | 377 | return FTW_CONTINUE; |
1829dc9d | 378 | }; |
6f7729c1 KN |
379 | |
380 | static int relabel_cgroup_filesystems(void) { | |
381 | int r; | |
382 | struct statfs st; | |
383 | ||
384 | r = cg_all_unified(); | |
385 | if (r == 0) { | |
386 | /* Temporarily remount the root cgroup filesystem to give it a proper label. Do this | |
387 | only when the filesystem has been already populated by a previous instance of systemd | |
388 | running from initrd. Otherwise don't remount anything and leave the filesystem read-write | |
389 | for the cgroup filesystems to be mounted inside. */ | |
771b7ead | 390 | if (statfs("/sys/fs/cgroup", &st) < 0) |
6f7729c1 | 391 | return log_error_errno(errno, "Failed to determine mount flags for /sys/fs/cgroup: %m"); |
6f7729c1 KN |
392 | |
393 | if (st.f_flags & ST_RDONLY) | |
394 | (void) mount(NULL, "/sys/fs/cgroup", NULL, MS_REMOUNT, NULL); | |
395 | ||
396 | (void) label_fix("/sys/fs/cgroup", 0); | |
771b7ead | 397 | (void) nftw("/sys/fs/cgroup", nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL); |
6f7729c1 KN |
398 | |
399 | if (st.f_flags & ST_RDONLY) | |
400 | (void) mount(NULL, "/sys/fs/cgroup", NULL, MS_REMOUNT|MS_RDONLY, NULL); | |
771b7ead | 401 | |
6f7729c1 KN |
402 | } else if (r < 0) |
403 | return log_error_errno(r, "Failed to determine whether we are in all unified mode: %m"); | |
404 | ||
405 | return 0; | |
406 | } | |
0fff82e5 | 407 | #endif |
1829dc9d | 408 | |
0b3325e7 | 409 | int mount_setup(bool loaded_policy) { |
68d4c452 | 410 | int r = 0; |
8e274523 | 411 | |
400fac06 | 412 | r = mount_points_setup(ELEMENTSOF(mount_table), loaded_policy); |
68d4c452 LP |
413 | if (r < 0) |
414 | return r; | |
415 | ||
f9fa32f0 | 416 | #if HAVE_SELINUX || ENABLE_SMACK |
f1d19aa4 LP |
417 | /* Nodes in devtmpfs and /run need to be manually updated for |
418 | * the appropriate labels, after mounting. The other virtual | |
419 | * API file systems like /sys and /proc do not need that, they | |
420 | * use the same label for all their files. */ | |
0b3325e7 LP |
421 | if (loaded_policy) { |
422 | usec_t before_relabel, after_relabel; | |
423 | char timespan[FORMAT_TIMESPAN_MAX]; | |
424 | ||
425 | before_relabel = now(CLOCK_MONOTONIC); | |
426 | ||
771b7ead LP |
427 | (void) nftw("/dev", nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL); |
428 | (void) nftw("/dev/shm", nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL); | |
429 | (void) nftw("/run", nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL); | |
0b3325e7 | 430 | |
6f7729c1 KN |
431 | r = relabel_cgroup_filesystems(); |
432 | if (r < 0) | |
433 | return r; | |
8739f23e | 434 | |
0b3325e7 LP |
435 | after_relabel = now(CLOCK_MONOTONIC); |
436 | ||
8739f23e | 437 | log_info("Relabelled /dev, /run and /sys/fs/cgroup in %s.", |
2fa4092c | 438 | format_timespan(timespan, sizeof(timespan), after_relabel - before_relabel, 0)); |
3bbecb2f | 439 | } |
0fff82e5 | 440 | #endif |
1829dc9d | 441 | |
5c0532d1 | 442 | /* Create a few default symlinks, which are normally created |
f1d19aa4 | 443 | * by udevd, but some scripts might need them before we start |
5c0532d1 | 444 | * udevd. */ |
03cfe0d5 | 445 | dev_setup(NULL, UID_INVALID, GID_INVALID); |
5c0532d1 | 446 | |
dee22f39 LP |
447 | /* Mark the root directory as shared in regards to mount propagation. The kernel defaults to "private", but we |
448 | * think it makes more sense to have a default of "shared" so that nspawn and the container tools work out of | |
449 | * the box. If specific setups need other settings they can reset the propagation mode to private if | |
450 | * needed. Note that we set this only when we are invoked directly by the kernel. If we are invoked by a | |
451 | * container manager we assume the container manager knows what it is doing (for example, because it set up | |
452 | * some directories with different propagation modes). */ | |
75f86906 | 453 | if (detect_container() <= 0) |
c481f78b | 454 | if (mount(NULL, "/", NULL, MS_REC|MS_SHARED, NULL) < 0) |
56f64d95 | 455 | log_warning_errno(errno, "Failed to set up the root directory for shared mount propagation: %m"); |
b3ac5f8c | 456 | |
dee22f39 LP |
457 | /* Create a few directories we always want around, Note that sd_booted() checks for /run/systemd/system, so |
458 | * this mkdir really needs to stay for good, otherwise software that copied sd-daemon.c into their sources will | |
459 | * misdetect systemd. */ | |
c4b41707 AP |
460 | (void) mkdir_label("/run/systemd", 0755); |
461 | (void) mkdir_label("/run/systemd/system", 0755); | |
dee22f39 | 462 | |
30874dda LP |
463 | /* Also create /run/systemd/inaccessible nodes, so that we always have something to mount inaccessible nodes |
464 | * from. */ | |
465 | (void) make_inaccessible_nodes(NULL, UID_INVALID, GID_INVALID); | |
fe80fcc7 | 466 | |
0c85a4f3 | 467 | return 0; |
8e274523 | 468 | } |