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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 LP |
22 | #include "mount-setup.h" |
23 | #include "mount-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 | ||
0c85a4f3 | 232 | int mount_cgroup_controllers(char ***join_controllers) { |
a6b26d90 | 233 | _cleanup_set_free_free_ Set *controllers = NULL; |
5cbaad2f | 234 | bool has_argument = !!join_controllers; |
a641dcd9 | 235 | int r; |
2076ca54 | 236 | |
efdb0237 LP |
237 | if (!cg_is_legacy_wanted()) |
238 | return 0; | |
239 | ||
670802d4 | 240 | /* Mount all available cgroup controllers that are built into the kernel. */ |
2076ca54 | 241 | |
5cbaad2f | 242 | if (!has_argument) |
56c8d744 ZJS |
243 | /* The defaults: |
244 | * mount "cpu" + "cpuacct" together, and "net_cls" + "net_prio". | |
245 | * | |
246 | * We'd like to add "cpuset" to the mix, but "cpuset" doesn't really | |
247 | * work for groups with no initialized attributes. | |
248 | */ | |
249 | join_controllers = (char**[]) { | |
250 | STRV_MAKE("cpu", "cpuacct"), | |
251 | STRV_MAKE("net_cls", "net_prio"), | |
252 | NULL, | |
253 | }; | |
254 | ||
6925a0de | 255 | r = cg_kernel_controllers(&controllers); |
b12afc8c LP |
256 | if (r < 0) |
257 | return log_error_errno(r, "Failed to enumerate cgroup controllers: %m"); | |
0c85a4f3 LP |
258 | |
259 | for (;;) { | |
a641dcd9 | 260 | _cleanup_free_ char *options = NULL, *controller = NULL, *where = NULL; |
a6b26d90 ZJS |
261 | MountPoint p = { |
262 | .what = "cgroup", | |
263 | .type = "cgroup", | |
264 | .flags = MS_NOSUID|MS_NOEXEC|MS_NODEV, | |
265 | .mode = MNT_IN_CONTAINER, | |
266 | }; | |
0c85a4f3 LP |
267 | char ***k = NULL; |
268 | ||
269 | controller = set_steal_first(controllers); | |
270 | if (!controller) | |
271 | break; | |
272 | ||
56c8d744 ZJS |
273 | for (k = join_controllers; *k; k++) |
274 | if (strv_find(*k, controller)) | |
275 | break; | |
0c85a4f3 | 276 | |
f1470e42 | 277 | if (*k) { |
0c85a4f3 LP |
278 | char **i, **j; |
279 | ||
280 | for (i = *k, j = *k; *i; i++) { | |
281 | ||
282 | if (!streq(*i, controller)) { | |
a641dcd9 | 283 | _cleanup_free_ char *t; |
0c85a4f3 LP |
284 | |
285 | t = set_remove(controllers, *i); | |
286 | if (!t) { | |
5cbaad2f YW |
287 | if (has_argument) |
288 | free(*i); | |
0c85a4f3 LP |
289 | continue; |
290 | } | |
0c85a4f3 LP |
291 | } |
292 | ||
293 | *(j++) = *i; | |
294 | } | |
295 | ||
296 | *j = NULL; | |
297 | ||
298 | options = strv_join(*k, ","); | |
a6b26d90 ZJS |
299 | if (!options) |
300 | return log_oom(); | |
ae2a15bc LP |
301 | } else |
302 | options = TAKE_PTR(controller); | |
0c85a4f3 | 303 | |
a641dcd9 LP |
304 | where = strappend("/sys/fs/cgroup/", options); |
305 | if (!where) | |
306 | return log_oom(); | |
307 | ||
308 | p.where = where; | |
0c85a4f3 | 309 | p.options = options; |
2076ca54 | 310 | |
4ef31082 | 311 | r = mount_one(&p, true); |
a6b26d90 ZJS |
312 | if (r < 0) |
313 | return r; | |
0c85a4f3 | 314 | |
6978efcf | 315 | if (r > 0 && *k) { |
0c85a4f3 LP |
316 | char **i; |
317 | ||
318 | for (i = *k; *i; i++) { | |
a641dcd9 LP |
319 | _cleanup_free_ char *t = NULL; |
320 | ||
321 | t = strappend("/sys/fs/cgroup/", *i); | |
322 | if (!t) | |
323 | return log_oom(); | |
0c85a4f3 LP |
324 | |
325 | r = symlink(options, t); | |
ea2b93a8 | 326 | if (r >= 0) { |
f8c1a81c | 327 | #ifdef SMACK_RUN_LABEL |
ea2b93a8 PO |
328 | _cleanup_free_ char *src; |
329 | src = strappend("/sys/fs/cgroup/", options); | |
330 | if (!src) | |
331 | return log_oom(); | |
332 | r = mac_smack_copy(t, src); | |
333 | if (r < 0 && r != -EOPNOTSUPP) | |
334 | return log_error_errno(r, "Failed to copy smack label from %s to %s: %m", src, t); | |
f8c1a81c | 335 | #endif |
ea2b93a8 PO |
336 | } else if (errno != EEXIST) |
337 | return log_error_errno(errno, "Failed to create symlink %s: %m", t); | |
0c85a4f3 LP |
338 | } |
339 | } | |
2076ca54 LP |
340 | } |
341 | ||
679142ce LP |
342 | /* Now that we mounted everything, let's make the tmpfs the |
343 | * cgroup file systems are mounted into read-only. */ | |
b12afc8c | 344 | (void) mount("tmpfs", "/sys/fs/cgroup", "tmpfs", MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME|MS_RDONLY, "mode=755"); |
679142ce | 345 | |
a6b26d90 | 346 | return 0; |
2076ca54 LP |
347 | } |
348 | ||
f9fa32f0 | 349 | #if HAVE_SELINUX || ENABLE_SMACK |
1829dc9d LP |
350 | static int nftw_cb( |
351 | const char *fpath, | |
352 | const struct stat *sb, | |
353 | int tflag, | |
354 | struct FTW *ftwbuf) { | |
355 | ||
9fe117ea | 356 | /* No need to label /dev twice in a row... */ |
edb49778 LP |
357 | if (_unlikely_(ftwbuf->level == 0)) |
358 | return FTW_CONTINUE; | |
359 | ||
08c84981 | 360 | (void) label_fix(fpath, 0); |
af65c248 | 361 | |
edb49778 | 362 | /* /run/initramfs is static data and big, no need to |
af65c248 | 363 | * dynamically relabel its contents at boot... */ |
edb49778 LP |
364 | if (_unlikely_(ftwbuf->level == 1 && |
365 | tflag == FTW_D && | |
366 | streq(fpath, "/run/initramfs"))) | |
367 | return FTW_SKIP_SUBTREE; | |
9fe117ea | 368 | |
edb49778 | 369 | return FTW_CONTINUE; |
1829dc9d | 370 | }; |
6f7729c1 KN |
371 | |
372 | static int relabel_cgroup_filesystems(void) { | |
373 | int r; | |
374 | struct statfs st; | |
375 | ||
376 | r = cg_all_unified(); | |
377 | if (r == 0) { | |
378 | /* Temporarily remount the root cgroup filesystem to give it a proper label. Do this | |
379 | only when the filesystem has been already populated by a previous instance of systemd | |
380 | running from initrd. Otherwise don't remount anything and leave the filesystem read-write | |
381 | for the cgroup filesystems to be mounted inside. */ | |
771b7ead | 382 | if (statfs("/sys/fs/cgroup", &st) < 0) |
6f7729c1 | 383 | return log_error_errno(errno, "Failed to determine mount flags for /sys/fs/cgroup: %m"); |
6f7729c1 KN |
384 | |
385 | if (st.f_flags & ST_RDONLY) | |
386 | (void) mount(NULL, "/sys/fs/cgroup", NULL, MS_REMOUNT, NULL); | |
387 | ||
388 | (void) label_fix("/sys/fs/cgroup", 0); | |
771b7ead | 389 | (void) nftw("/sys/fs/cgroup", nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL); |
6f7729c1 KN |
390 | |
391 | if (st.f_flags & ST_RDONLY) | |
392 | (void) mount(NULL, "/sys/fs/cgroup", NULL, MS_REMOUNT|MS_RDONLY, NULL); | |
771b7ead | 393 | |
6f7729c1 KN |
394 | } else if (r < 0) |
395 | return log_error_errno(r, "Failed to determine whether we are in all unified mode: %m"); | |
396 | ||
397 | return 0; | |
398 | } | |
0fff82e5 | 399 | #endif |
1829dc9d | 400 | |
0b3325e7 | 401 | int mount_setup(bool loaded_policy) { |
68d4c452 | 402 | int r = 0; |
8e274523 | 403 | |
400fac06 | 404 | r = mount_points_setup(ELEMENTSOF(mount_table), loaded_policy); |
68d4c452 LP |
405 | if (r < 0) |
406 | return r; | |
407 | ||
f9fa32f0 | 408 | #if HAVE_SELINUX || ENABLE_SMACK |
f1d19aa4 LP |
409 | /* Nodes in devtmpfs and /run need to be manually updated for |
410 | * the appropriate labels, after mounting. The other virtual | |
411 | * API file systems like /sys and /proc do not need that, they | |
412 | * use the same label for all their files. */ | |
0b3325e7 LP |
413 | if (loaded_policy) { |
414 | usec_t before_relabel, after_relabel; | |
415 | char timespan[FORMAT_TIMESPAN_MAX]; | |
416 | ||
417 | before_relabel = now(CLOCK_MONOTONIC); | |
418 | ||
771b7ead LP |
419 | (void) nftw("/dev", nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL); |
420 | (void) nftw("/dev/shm", nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL); | |
421 | (void) nftw("/run", nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL); | |
0b3325e7 | 422 | |
6f7729c1 KN |
423 | r = relabel_cgroup_filesystems(); |
424 | if (r < 0) | |
425 | return r; | |
8739f23e | 426 | |
0b3325e7 LP |
427 | after_relabel = now(CLOCK_MONOTONIC); |
428 | ||
8739f23e | 429 | log_info("Relabelled /dev, /run and /sys/fs/cgroup in %s.", |
2fa4092c | 430 | format_timespan(timespan, sizeof(timespan), after_relabel - before_relabel, 0)); |
3bbecb2f | 431 | } |
0fff82e5 | 432 | #endif |
1829dc9d | 433 | |
5c0532d1 | 434 | /* Create a few default symlinks, which are normally created |
f1d19aa4 | 435 | * by udevd, but some scripts might need them before we start |
5c0532d1 | 436 | * udevd. */ |
03cfe0d5 | 437 | dev_setup(NULL, UID_INVALID, GID_INVALID); |
5c0532d1 | 438 | |
dee22f39 LP |
439 | /* Mark the root directory as shared in regards to mount propagation. The kernel defaults to "private", but we |
440 | * think it makes more sense to have a default of "shared" so that nspawn and the container tools work out of | |
441 | * the box. If specific setups need other settings they can reset the propagation mode to private if | |
442 | * needed. Note that we set this only when we are invoked directly by the kernel. If we are invoked by a | |
443 | * container manager we assume the container manager knows what it is doing (for example, because it set up | |
444 | * some directories with different propagation modes). */ | |
75f86906 | 445 | if (detect_container() <= 0) |
c481f78b | 446 | if (mount(NULL, "/", NULL, MS_REC|MS_SHARED, NULL) < 0) |
56f64d95 | 447 | log_warning_errno(errno, "Failed to set up the root directory for shared mount propagation: %m"); |
b3ac5f8c | 448 | |
dee22f39 LP |
449 | /* Create a few directories we always want around, Note that sd_booted() checks for /run/systemd/system, so |
450 | * this mkdir really needs to stay for good, otherwise software that copied sd-daemon.c into their sources will | |
451 | * misdetect systemd. */ | |
c4b41707 AP |
452 | (void) mkdir_label("/run/systemd", 0755); |
453 | (void) mkdir_label("/run/systemd/system", 0755); | |
dee22f39 | 454 | |
fe80fcc7 | 455 | /* Set up inaccessible (and empty) file nodes of all types */ |
dee22f39 | 456 | (void) mkdir_label("/run/systemd/inaccessible", 0000); |
c4b41707 AP |
457 | (void) mknod("/run/systemd/inaccessible/reg", S_IFREG | 0000, 0); |
458 | (void) mkdir_label("/run/systemd/inaccessible/dir", 0000); | |
c4b41707 AP |
459 | (void) mkfifo("/run/systemd/inaccessible/fifo", 0000); |
460 | (void) mknod("/run/systemd/inaccessible/sock", S_IFSOCK | 0000, 0); | |
b925e726 | 461 | |
fe80fcc7 LP |
462 | /* The following two are likely to fail if we lack the privs for it (for example in an userns environment, if |
463 | * CAP_SYS_MKNOD is missing, or if a device node policy prohibit major/minor of 0 device nodes to be | |
464 | * created). But that's entirely fine. Consumers of these files should carry fallback to use a different node | |
465 | * then, for example /run/systemd/inaccessible/sock, which is close enough in behaviour and semantics for most | |
466 | * uses. */ | |
467 | (void) mknod("/run/systemd/inaccessible/chr", S_IFCHR | 0000, makedev(0, 0)); | |
468 | (void) mknod("/run/systemd/inaccessible/blk", S_IFBLK | 0000, makedev(0, 0)); | |
469 | ||
0c85a4f3 | 470 | return 0; |
8e274523 | 471 | } |