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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
8e274523 LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2010 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
8 | under the terms of the GNU Lesser General Public License as published by |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
8e274523 LP |
10 | (at your option) any later version. |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 15 | Lesser General Public License for more details. |
8e274523 | 16 | |
5430f7f2 | 17 | You should have received a copy of the GNU Lesser General Public License |
8e274523 LP |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
19 | ***/ | |
20 | ||
8e274523 | 21 | #include <errno.h> |
cf0fbc49 | 22 | #include <ftw.h> |
8e274523 | 23 | #include <stdlib.h> |
cf0fbc49 | 24 | #include <sys/mount.h> |
5c0532d1 | 25 | #include <unistd.h> |
8e274523 | 26 | |
b5efdb8a | 27 | #include "alloc-util.h" |
64824462 | 28 | #include "bus-util.h" |
4349cd7c LP |
29 | #include "cgroup-util.h" |
30 | #include "dev-setup.h" | |
31 | #include "efivars.h" | |
e07aefbd | 32 | #include "fileio.h" |
c4b41707 | 33 | #include "fs-util.h" |
4349cd7c | 34 | #include "label.h" |
8e274523 | 35 | #include "log.h" |
c9af1080 | 36 | #include "macro.h" |
4349cd7c | 37 | #include "missing.h" |
49e942b2 | 38 | #include "mkdir.h" |
4349cd7c LP |
39 | #include "mount-setup.h" |
40 | #include "mount-util.h" | |
9eb977db | 41 | #include "path-util.h" |
4349cd7c | 42 | #include "set.h" |
8552b176 | 43 | #include "smack-util.h" |
4349cd7c | 44 | #include "strv.h" |
ee104e11 | 45 | #include "user-util.h" |
4349cd7c LP |
46 | #include "util.h" |
47 | #include "virt.h" | |
bef2733f | 48 | |
6aa220e0 | 49 | typedef enum MountMode { |
e07aefbd CB |
50 | MNT_NONE = 0, |
51 | MNT_FATAL = 1 << 0, | |
52 | MNT_IN_CONTAINER = 1 << 1, | |
53 | MNT_CHECK_WRITABLE = 1 << 2, | |
6aa220e0 KS |
54 | } MountMode; |
55 | ||
ca714c0e LP |
56 | typedef struct MountPoint { |
57 | const char *what; | |
58 | const char *where; | |
59 | const char *type; | |
60 | const char *options; | |
61 | unsigned long flags; | |
6aa220e0 KS |
62 | bool (*condition_fn)(void); |
63 | MountMode mode; | |
ca714c0e LP |
64 | } MountPoint; |
65 | ||
4ef31082 | 66 | /* The first three entries we might need before SELinux is up. The |
160481f6 | 67 | * fourth (securityfs) is needed by IMA to load a custom policy. The |
7c96ab1d LP |
68 | * other ones we can delay until SELinux and IMA are loaded. When |
69 | * SMACK is enabled we need smackfs, too, so it's a fifth one. */ | |
f9fa32f0 | 70 | #if ENABLE_SMACK |
ffbd2c4d | 71 | #define N_EARLY_MOUNT 5 |
7c96ab1d LP |
72 | #else |
73 | #define N_EARLY_MOUNT 4 | |
74 | #endif | |
4ef31082 | 75 | |
ca714c0e | 76 | static const MountPoint mount_table[] = { |
68d4c452 LP |
77 | { "sysfs", "/sys", "sysfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
78 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
79 | { "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, | |
80 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
81 | { "devtmpfs", "/dev", "devtmpfs", "mode=755", MS_NOSUID|MS_STRICTATIME, | |
82 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
83 | { "securityfs", "/sys/kernel/security", "securityfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, | |
84 | NULL, MNT_NONE }, | |
f9fa32f0 | 85 | #if ENABLE_SMACK |
68d4c452 LP |
86 | { "smackfs", "/sys/fs/smackfs", "smackfs", "smackfsdef=*", MS_NOSUID|MS_NOEXEC|MS_NODEV, |
87 | mac_smack_use, MNT_FATAL }, | |
88 | { "tmpfs", "/dev/shm", "tmpfs", "mode=1777,smackfsroot=*", MS_NOSUID|MS_NODEV|MS_STRICTATIME, | |
89 | mac_smack_use, MNT_FATAL }, | |
d407c940 | 90 | #endif |
68d4c452 LP |
91 | { "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME, |
92 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
93 | { "devpts", "/dev/pts", "devpts", "mode=620,gid=" STRINGIFY(TTY_GID), MS_NOSUID|MS_NOEXEC, | |
94 | NULL, MNT_IN_CONTAINER }, | |
f9fa32f0 | 95 | #if ENABLE_SMACK |
68d4c452 LP |
96 | { "tmpfs", "/run", "tmpfs", "mode=755,smackfsroot=*", MS_NOSUID|MS_NODEV|MS_STRICTATIME, |
97 | mac_smack_use, MNT_FATAL }, | |
d407c940 | 98 | #endif |
68d4c452 LP |
99 | { "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME, |
100 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
65900808 | 101 | { "cgroup2", "/sys/fs/cgroup", "cgroup2", "nsdelegate", MS_NOSUID|MS_NOEXEC|MS_NODEV, |
2d56b80a | 102 | cg_is_unified_wanted, MNT_IN_CONTAINER|MNT_CHECK_WRITABLE }, |
65900808 | 103 | { "cgroup2", "/sys/fs/cgroup", "cgroup2", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
2d56b80a | 104 | cg_is_unified_wanted, MNT_IN_CONTAINER|MNT_CHECK_WRITABLE }, |
68d4c452 | 105 | { "tmpfs", "/sys/fs/cgroup", "tmpfs", "mode=755", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME, |
efdb0237 | 106 | cg_is_legacy_wanted, MNT_FATAL|MNT_IN_CONTAINER }, |
65900808 | 107 | { "cgroup2", "/sys/fs/cgroup/unified", "cgroup2", "nsdelegate", MS_NOSUID|MS_NOEXEC|MS_NODEV, |
e07aefbd | 108 | cg_is_hybrid_wanted, MNT_IN_CONTAINER|MNT_CHECK_WRITABLE }, |
65900808 | 109 | { "cgroup2", "/sys/fs/cgroup/unified", "cgroup2", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
e07aefbd | 110 | cg_is_hybrid_wanted, MNT_IN_CONTAINER|MNT_CHECK_WRITABLE }, |
68d4c452 | 111 | { "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd,xattr", MS_NOSUID|MS_NOEXEC|MS_NODEV, |
2977724b | 112 | cg_is_legacy_wanted, MNT_IN_CONTAINER }, |
68d4c452 | 113 | { "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd", MS_NOSUID|MS_NOEXEC|MS_NODEV, |
2977724b | 114 | cg_is_legacy_wanted, MNT_FATAL|MNT_IN_CONTAINER }, |
68d4c452 LP |
115 | { "pstore", "/sys/fs/pstore", "pstore", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
116 | NULL, MNT_NONE }, | |
349cc4a5 | 117 | #if ENABLE_EFI |
68d4c452 LP |
118 | { "efivarfs", "/sys/firmware/efi/efivars", "efivarfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
119 | is_efi_boot, MNT_NONE }, | |
c06bf414 | 120 | #endif |
43b7f24b LP |
121 | { "bpf", "/sys/fs/bpf", "bpf", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
122 | NULL, MNT_NONE, }, | |
63cc4c31 DM |
123 | }; |
124 | ||
949c6510 | 125 | /* These are API file systems that might be mounted by other software, |
46ff0ed7 | 126 | * we just list them here so that we know that we should ignore them */ |
949c6510 | 127 | |
eaeb18db LP |
128 | static const char ignore_paths[] = |
129 | /* SELinux file systems */ | |
130 | "/sys/fs/selinux\0" | |
eaeb18db LP |
131 | /* Container bind mounts */ |
132 | "/proc/sys\0" | |
133 | "/dev/console\0" | |
c481f78b | 134 | "/proc/kmsg\0"; |
949c6510 | 135 | |
dad08730 LP |
136 | bool mount_point_is_api(const char *path) { |
137 | unsigned i; | |
138 | ||
139 | /* Checks if this mount point is considered "API", and hence | |
140 | * should be ignored */ | |
141 | ||
ca714c0e | 142 | for (i = 0; i < ELEMENTSOF(mount_table); i ++) |
449ddb2d | 143 | if (path_equal(path, mount_table[i].where)) |
dad08730 LP |
144 | return true; |
145 | ||
57f2a956 KS |
146 | return path_startswith(path, "/sys/fs/cgroup/"); |
147 | } | |
148 | ||
149 | bool mount_point_ignore(const char *path) { | |
eaeb18db | 150 | const char *i; |
57f2a956 | 151 | |
eaeb18db LP |
152 | NULSTR_FOREACH(i, ignore_paths) |
153 | if (path_equal(path, i)) | |
949c6510 LP |
154 | return true; |
155 | ||
57f2a956 | 156 | return false; |
dad08730 LP |
157 | } |
158 | ||
4ef31082 | 159 | static int mount_one(const MountPoint *p, bool relabel) { |
713a8875 | 160 | int r, priority; |
8e274523 | 161 | |
ca714c0e | 162 | assert(p); |
8e274523 | 163 | |
713a8875 LP |
164 | priority = (p->mode & MNT_FATAL) ? LOG_ERR : LOG_DEBUG; |
165 | ||
6aa220e0 KS |
166 | if (p->condition_fn && !p->condition_fn()) |
167 | return 0; | |
168 | ||
51b4af2c | 169 | /* Relabel first, just in case */ |
4ef31082 | 170 | if (relabel) |
1411b094 | 171 | (void) label_fix(p->where, true, true); |
51b4af2c | 172 | |
e1873695 | 173 | r = path_is_mount_point(p->where, NULL, AT_SYMLINK_FOLLOW); |
1411b094 | 174 | if (r < 0 && r != -ENOENT) { |
713a8875 | 175 | log_full_errno(priority, r, "Failed to determine whether %s is a mount point: %m", p->where); |
1411b094 LP |
176 | return (p->mode & MNT_FATAL) ? r : 0; |
177 | } | |
8e274523 | 178 | if (r > 0) |
51b4af2c | 179 | return 0; |
8e274523 | 180 | |
c481f78b | 181 | /* Skip securityfs in a container */ |
75f86906 | 182 | if (!(p->mode & MNT_IN_CONTAINER) && detect_container() > 0) |
c481f78b LP |
183 | return 0; |
184 | ||
a04f58d6 LP |
185 | /* The access mode here doesn't really matter too much, since |
186 | * the mounted file system will take precedence anyway. */ | |
c4bfd169 | 187 | if (relabel) |
1411b094 | 188 | (void) mkdir_p_label(p->where, 0755); |
c4bfd169 | 189 | else |
1411b094 | 190 | (void) mkdir_p(p->where, 0755); |
a04f58d6 | 191 | |
8e274523 | 192 | log_debug("Mounting %s to %s of type %s with options %s.", |
ca714c0e LP |
193 | p->what, |
194 | p->where, | |
195 | p->type, | |
196 | strna(p->options)); | |
197 | ||
198 | if (mount(p->what, | |
199 | p->where, | |
200 | p->type, | |
201 | p->flags, | |
202 | p->options) < 0) { | |
713a8875 | 203 | log_full_errno(priority, errno, "Failed to mount %s at %s: %m", p->type, p->where); |
6aa220e0 | 204 | return (p->mode & MNT_FATAL) ? -errno : 0; |
8e274523 LP |
205 | } |
206 | ||
51b4af2c | 207 | /* Relabel again, since we now mounted something fresh here */ |
4ef31082 | 208 | if (relabel) |
1411b094 | 209 | (void) label_fix(p->where, false, false); |
5275d3c1 | 210 | |
e07aefbd | 211 | if (p->mode & MNT_CHECK_WRITABLE) { |
713a8875 LP |
212 | if (access(p->where, W_OK) < 0) { |
213 | r = -errno; | |
214 | ||
e07aefbd | 215 | (void) umount(p->where); |
1ff654e2 | 216 | (void) rmdir(p->where); |
713a8875 LP |
217 | |
218 | log_full_errno(priority, r, "Mount point %s not writable after mounting: %m", p->where); | |
e07aefbd CB |
219 | return (p->mode & MNT_FATAL) ? r : 0; |
220 | } | |
221 | } | |
222 | ||
0c85a4f3 | 223 | return 1; |
8e274523 LP |
224 | } |
225 | ||
400fac06 | 226 | static int mount_points_setup(unsigned n, bool loaded_policy) { |
4ef31082 LP |
227 | unsigned i; |
228 | int r = 0; | |
229 | ||
400fac06 | 230 | for (i = 0; i < n; i ++) { |
4ef31082 LP |
231 | int j; |
232 | ||
400fac06 | 233 | j = mount_one(mount_table + i, loaded_policy); |
7ff307bc | 234 | if (j != 0 && r >= 0) |
4ef31082 LP |
235 | r = j; |
236 | } | |
237 | ||
238 | return r; | |
239 | } | |
240 | ||
400fac06 AK |
241 | int mount_setup_early(void) { |
242 | assert_cc(N_EARLY_MOUNT <= ELEMENTSOF(mount_table)); | |
243 | ||
244 | /* Do a minimal mount of /proc and friends to enable the most | |
245 | * basic stuff, such as SELinux */ | |
246 | return mount_points_setup(N_EARLY_MOUNT, false); | |
247 | } | |
248 | ||
0c85a4f3 | 249 | int mount_cgroup_controllers(char ***join_controllers) { |
a6b26d90 | 250 | _cleanup_set_free_free_ Set *controllers = NULL; |
a641dcd9 | 251 | int r; |
2076ca54 | 252 | |
efdb0237 LP |
253 | if (!cg_is_legacy_wanted()) |
254 | return 0; | |
255 | ||
670802d4 | 256 | /* Mount all available cgroup controllers that are built into the kernel. */ |
2076ca54 | 257 | |
56c8d744 ZJS |
258 | if (!join_controllers) |
259 | /* The defaults: | |
260 | * mount "cpu" + "cpuacct" together, and "net_cls" + "net_prio". | |
261 | * | |
262 | * We'd like to add "cpuset" to the mix, but "cpuset" doesn't really | |
263 | * work for groups with no initialized attributes. | |
264 | */ | |
265 | join_controllers = (char**[]) { | |
266 | STRV_MAKE("cpu", "cpuacct"), | |
267 | STRV_MAKE("net_cls", "net_prio"), | |
268 | NULL, | |
269 | }; | |
270 | ||
6925a0de | 271 | r = cg_kernel_controllers(&controllers); |
b12afc8c LP |
272 | if (r < 0) |
273 | return log_error_errno(r, "Failed to enumerate cgroup controllers: %m"); | |
0c85a4f3 LP |
274 | |
275 | for (;;) { | |
a641dcd9 | 276 | _cleanup_free_ char *options = NULL, *controller = NULL, *where = NULL; |
a6b26d90 ZJS |
277 | MountPoint p = { |
278 | .what = "cgroup", | |
279 | .type = "cgroup", | |
280 | .flags = MS_NOSUID|MS_NOEXEC|MS_NODEV, | |
281 | .mode = MNT_IN_CONTAINER, | |
282 | }; | |
0c85a4f3 LP |
283 | char ***k = NULL; |
284 | ||
285 | controller = set_steal_first(controllers); | |
286 | if (!controller) | |
287 | break; | |
288 | ||
56c8d744 ZJS |
289 | for (k = join_controllers; *k; k++) |
290 | if (strv_find(*k, controller)) | |
291 | break; | |
0c85a4f3 LP |
292 | |
293 | if (k && *k) { | |
294 | char **i, **j; | |
295 | ||
296 | for (i = *k, j = *k; *i; i++) { | |
297 | ||
298 | if (!streq(*i, controller)) { | |
a641dcd9 | 299 | _cleanup_free_ char *t; |
0c85a4f3 LP |
300 | |
301 | t = set_remove(controllers, *i); | |
302 | if (!t) { | |
303 | free(*i); | |
304 | continue; | |
305 | } | |
0c85a4f3 LP |
306 | } |
307 | ||
308 | *(j++) = *i; | |
309 | } | |
310 | ||
311 | *j = NULL; | |
312 | ||
313 | options = strv_join(*k, ","); | |
a6b26d90 ZJS |
314 | if (!options) |
315 | return log_oom(); | |
0c85a4f3 LP |
316 | } else { |
317 | options = controller; | |
318 | controller = NULL; | |
319 | } | |
320 | ||
a641dcd9 LP |
321 | where = strappend("/sys/fs/cgroup/", options); |
322 | if (!where) | |
323 | return log_oom(); | |
324 | ||
325 | p.where = where; | |
0c85a4f3 | 326 | p.options = options; |
2076ca54 | 327 | |
4ef31082 | 328 | r = mount_one(&p, true); |
a6b26d90 ZJS |
329 | if (r < 0) |
330 | return r; | |
0c85a4f3 LP |
331 | |
332 | if (r > 0 && k && *k) { | |
333 | char **i; | |
334 | ||
335 | for (i = *k; *i; i++) { | |
a641dcd9 LP |
336 | _cleanup_free_ char *t = NULL; |
337 | ||
338 | t = strappend("/sys/fs/cgroup/", *i); | |
339 | if (!t) | |
340 | return log_oom(); | |
0c85a4f3 LP |
341 | |
342 | r = symlink(options, t); | |
ea2b93a8 | 343 | if (r >= 0) { |
f8c1a81c | 344 | #ifdef SMACK_RUN_LABEL |
ea2b93a8 PO |
345 | _cleanup_free_ char *src; |
346 | src = strappend("/sys/fs/cgroup/", options); | |
347 | if (!src) | |
348 | return log_oom(); | |
349 | r = mac_smack_copy(t, src); | |
350 | if (r < 0 && r != -EOPNOTSUPP) | |
351 | return log_error_errno(r, "Failed to copy smack label from %s to %s: %m", src, t); | |
f8c1a81c | 352 | #endif |
ea2b93a8 PO |
353 | } else if (errno != EEXIST) |
354 | return log_error_errno(errno, "Failed to create symlink %s: %m", t); | |
0c85a4f3 LP |
355 | } |
356 | } | |
2076ca54 LP |
357 | } |
358 | ||
679142ce LP |
359 | /* Now that we mounted everything, let's make the tmpfs the |
360 | * cgroup file systems are mounted into read-only. */ | |
b12afc8c | 361 | (void) mount("tmpfs", "/sys/fs/cgroup", "tmpfs", MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME|MS_RDONLY, "mode=755"); |
679142ce | 362 | |
a6b26d90 | 363 | return 0; |
2076ca54 LP |
364 | } |
365 | ||
f9fa32f0 | 366 | #if HAVE_SELINUX || ENABLE_SMACK |
1829dc9d LP |
367 | static int nftw_cb( |
368 | const char *fpath, | |
369 | const struct stat *sb, | |
370 | int tflag, | |
371 | struct FTW *ftwbuf) { | |
372 | ||
9fe117ea | 373 | /* No need to label /dev twice in a row... */ |
edb49778 LP |
374 | if (_unlikely_(ftwbuf->level == 0)) |
375 | return FTW_CONTINUE; | |
376 | ||
c9bc0764 | 377 | label_fix(fpath, false, false); |
af65c248 | 378 | |
edb49778 | 379 | /* /run/initramfs is static data and big, no need to |
af65c248 | 380 | * dynamically relabel its contents at boot... */ |
edb49778 LP |
381 | if (_unlikely_(ftwbuf->level == 1 && |
382 | tflag == FTW_D && | |
383 | streq(fpath, "/run/initramfs"))) | |
384 | return FTW_SKIP_SUBTREE; | |
9fe117ea | 385 | |
edb49778 | 386 | return FTW_CONTINUE; |
1829dc9d | 387 | }; |
0fff82e5 | 388 | #endif |
1829dc9d | 389 | |
0b3325e7 | 390 | int mount_setup(bool loaded_policy) { |
68d4c452 | 391 | int r = 0; |
8e274523 | 392 | |
400fac06 | 393 | r = mount_points_setup(ELEMENTSOF(mount_table), loaded_policy); |
68d4c452 LP |
394 | if (r < 0) |
395 | return r; | |
396 | ||
f9fa32f0 | 397 | #if HAVE_SELINUX || ENABLE_SMACK |
f1d19aa4 LP |
398 | /* Nodes in devtmpfs and /run need to be manually updated for |
399 | * the appropriate labels, after mounting. The other virtual | |
400 | * API file systems like /sys and /proc do not need that, they | |
401 | * use the same label for all their files. */ | |
0b3325e7 LP |
402 | if (loaded_policy) { |
403 | usec_t before_relabel, after_relabel; | |
404 | char timespan[FORMAT_TIMESPAN_MAX]; | |
405 | ||
406 | before_relabel = now(CLOCK_MONOTONIC); | |
407 | ||
edb49778 | 408 | nftw("/dev", nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL); |
cacf980e | 409 | nftw("/dev/shm", nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL); |
edb49778 | 410 | nftw("/run", nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL); |
0b3325e7 | 411 | |
8739f23e KN |
412 | /* Temporarily remount the root cgroup filesystem to give it a proper label. */ |
413 | r = cg_all_unified(); | |
414 | if (r == 0) { | |
415 | (void) mount(NULL, "/sys/fs/cgroup", NULL, MS_REMOUNT, NULL); | |
416 | label_fix("/sys/fs/cgroup", false, false); | |
417 | nftw("/sys/fs/cgroup", nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL); | |
418 | (void) mount(NULL, "/sys/fs/cgroup", NULL, MS_REMOUNT|MS_RDONLY, NULL); | |
419 | } else if (r < 0) | |
420 | return log_error_errno(r, "Failed to determine whether we are in all unified mode: %m"); | |
421 | ||
0b3325e7 LP |
422 | after_relabel = now(CLOCK_MONOTONIC); |
423 | ||
8739f23e | 424 | log_info("Relabelled /dev, /run and /sys/fs/cgroup in %s.", |
2fa4092c | 425 | format_timespan(timespan, sizeof(timespan), after_relabel - before_relabel, 0)); |
3bbecb2f | 426 | } |
0fff82e5 | 427 | #endif |
1829dc9d | 428 | |
5c0532d1 | 429 | /* Create a few default symlinks, which are normally created |
f1d19aa4 | 430 | * by udevd, but some scripts might need them before we start |
5c0532d1 | 431 | * udevd. */ |
03cfe0d5 | 432 | dev_setup(NULL, UID_INVALID, GID_INVALID); |
5c0532d1 | 433 | |
dee22f39 LP |
434 | /* Mark the root directory as shared in regards to mount propagation. The kernel defaults to "private", but we |
435 | * think it makes more sense to have a default of "shared" so that nspawn and the container tools work out of | |
436 | * the box. If specific setups need other settings they can reset the propagation mode to private if | |
437 | * needed. Note that we set this only when we are invoked directly by the kernel. If we are invoked by a | |
438 | * container manager we assume the container manager knows what it is doing (for example, because it set up | |
439 | * some directories with different propagation modes). */ | |
75f86906 | 440 | if (detect_container() <= 0) |
c481f78b | 441 | if (mount(NULL, "/", NULL, MS_REC|MS_SHARED, NULL) < 0) |
56f64d95 | 442 | log_warning_errno(errno, "Failed to set up the root directory for shared mount propagation: %m"); |
b3ac5f8c | 443 | |
dee22f39 LP |
444 | /* Create a few directories we always want around, Note that sd_booted() checks for /run/systemd/system, so |
445 | * this mkdir really needs to stay for good, otherwise software that copied sd-daemon.c into their sources will | |
446 | * misdetect systemd. */ | |
c4b41707 AP |
447 | (void) mkdir_label("/run/systemd", 0755); |
448 | (void) mkdir_label("/run/systemd/system", 0755); | |
dee22f39 | 449 | |
c4b41707 | 450 | /* Set up inaccessible items */ |
dee22f39 | 451 | (void) mkdir_label("/run/systemd/inaccessible", 0000); |
c4b41707 AP |
452 | (void) mknod("/run/systemd/inaccessible/reg", S_IFREG | 0000, 0); |
453 | (void) mkdir_label("/run/systemd/inaccessible/dir", 0000); | |
454 | (void) mknod("/run/systemd/inaccessible/chr", S_IFCHR | 0000, makedev(0, 0)); | |
455 | (void) mknod("/run/systemd/inaccessible/blk", S_IFBLK | 0000, makedev(0, 0)); | |
456 | (void) mkfifo("/run/systemd/inaccessible/fifo", 0000); | |
457 | (void) mknod("/run/systemd/inaccessible/sock", S_IFSOCK | 0000, 0); | |
b925e726 | 458 | |
0c85a4f3 | 459 | return 0; |
8e274523 | 460 | } |