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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" | |
65e183d7 | 14 | #include "dirent-util.h" |
4349cd7c | 15 | #include "efivars.h" |
65e183d7 | 16 | #include "fd-util.h" |
e07aefbd | 17 | #include "fileio.h" |
c4b41707 | 18 | #include "fs-util.h" |
4349cd7c | 19 | #include "label.h" |
8e274523 | 20 | #include "log.h" |
c9af1080 | 21 | #include "macro.h" |
4349cd7c | 22 | #include "missing.h" |
49e942b2 | 23 | #include "mkdir.h" |
4349cd7c | 24 | #include "mount-setup.h" |
049af8ad | 25 | #include "mountpoint-util.h" |
d8b4d14d | 26 | #include "nulstr-util.h" |
9eb977db | 27 | #include "path-util.h" |
4349cd7c | 28 | #include "set.h" |
8552b176 | 29 | #include "smack-util.h" |
4349cd7c | 30 | #include "strv.h" |
ee104e11 | 31 | #include "user-util.h" |
4349cd7c | 32 | #include "virt.h" |
bef2733f | 33 | |
6aa220e0 | 34 | typedef enum MountMode { |
ef31828d LP |
35 | MNT_NONE = 0, |
36 | MNT_FATAL = 1 << 0, | |
37 | MNT_IN_CONTAINER = 1 << 1, | |
38 | MNT_CHECK_WRITABLE = 1 << 2, | |
6aa220e0 KS |
39 | } MountMode; |
40 | ||
ca714c0e LP |
41 | typedef struct MountPoint { |
42 | const char *what; | |
43 | const char *where; | |
44 | const char *type; | |
45 | const char *options; | |
46 | unsigned long flags; | |
6aa220e0 KS |
47 | bool (*condition_fn)(void); |
48 | MountMode mode; | |
ca714c0e LP |
49 | } MountPoint; |
50 | ||
4ef31082 | 51 | /* The first three entries we might need before SELinux is up. The |
160481f6 | 52 | * fourth (securityfs) is needed by IMA to load a custom policy. The |
7c96ab1d LP |
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. */ | |
f9fa32f0 | 55 | #if ENABLE_SMACK |
ffbd2c4d | 56 | #define N_EARLY_MOUNT 5 |
7c96ab1d LP |
57 | #else |
58 | #define N_EARLY_MOUNT 4 | |
59 | #endif | |
4ef31082 | 60 | |
ca714c0e | 61 | static const MountPoint mount_table[] = { |
68d4c452 LP |
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 }, | |
f9fa32f0 | 70 | #if ENABLE_SMACK |
68d4c452 LP |
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 }, | |
d407c940 | 75 | #endif |
68d4c452 LP |
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 }, | |
f9fa32f0 | 80 | #if ENABLE_SMACK |
68d4c452 LP |
81 | { "tmpfs", "/run", "tmpfs", "mode=755,smackfsroot=*", MS_NOSUID|MS_NODEV|MS_STRICTATIME, |
82 | mac_smack_use, MNT_FATAL }, | |
d407c940 | 83 | #endif |
68d4c452 LP |
84 | { "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME, |
85 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
65900808 | 86 | { "cgroup2", "/sys/fs/cgroup", "cgroup2", "nsdelegate", MS_NOSUID|MS_NOEXEC|MS_NODEV, |
2d56b80a | 87 | cg_is_unified_wanted, MNT_IN_CONTAINER|MNT_CHECK_WRITABLE }, |
65900808 | 88 | { "cgroup2", "/sys/fs/cgroup", "cgroup2", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
2d56b80a | 89 | cg_is_unified_wanted, MNT_IN_CONTAINER|MNT_CHECK_WRITABLE }, |
68d4c452 | 90 | { "tmpfs", "/sys/fs/cgroup", "tmpfs", "mode=755", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME, |
efdb0237 | 91 | cg_is_legacy_wanted, MNT_FATAL|MNT_IN_CONTAINER }, |
65900808 | 92 | { "cgroup2", "/sys/fs/cgroup/unified", "cgroup2", "nsdelegate", MS_NOSUID|MS_NOEXEC|MS_NODEV, |
e07aefbd | 93 | cg_is_hybrid_wanted, MNT_IN_CONTAINER|MNT_CHECK_WRITABLE }, |
65900808 | 94 | { "cgroup2", "/sys/fs/cgroup/unified", "cgroup2", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
e07aefbd | 95 | cg_is_hybrid_wanted, MNT_IN_CONTAINER|MNT_CHECK_WRITABLE }, |
68d4c452 | 96 | { "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd,xattr", MS_NOSUID|MS_NOEXEC|MS_NODEV, |
2977724b | 97 | cg_is_legacy_wanted, MNT_IN_CONTAINER }, |
68d4c452 | 98 | { "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd", MS_NOSUID|MS_NOEXEC|MS_NODEV, |
2977724b | 99 | cg_is_legacy_wanted, MNT_FATAL|MNT_IN_CONTAINER }, |
68d4c452 LP |
100 | { "pstore", "/sys/fs/pstore", "pstore", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
101 | NULL, MNT_NONE }, | |
349cc4a5 | 102 | #if ENABLE_EFI |
68d4c452 LP |
103 | { "efivarfs", "/sys/firmware/efi/efivars", "efivarfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
104 | is_efi_boot, MNT_NONE }, | |
c06bf414 | 105 | #endif |
39f305a9 | 106 | { "bpf", "/sys/fs/bpf", "bpf", "mode=700", MS_NOSUID|MS_NOEXEC|MS_NODEV, |
43b7f24b | 107 | NULL, MNT_NONE, }, |
63cc4c31 DM |
108 | }; |
109 | ||
949c6510 | 110 | /* These are API file systems that might be mounted by other software, |
46ff0ed7 | 111 | * we just list them here so that we know that we should ignore them */ |
949c6510 | 112 | |
eaeb18db LP |
113 | static const char ignore_paths[] = |
114 | /* SELinux file systems */ | |
115 | "/sys/fs/selinux\0" | |
eaeb18db LP |
116 | /* Container bind mounts */ |
117 | "/proc/sys\0" | |
118 | "/dev/console\0" | |
c481f78b | 119 | "/proc/kmsg\0"; |
949c6510 | 120 | |
dad08730 LP |
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 | ||
ca714c0e | 127 | for (i = 0; i < ELEMENTSOF(mount_table); i ++) |
449ddb2d | 128 | if (path_equal(path, mount_table[i].where)) |
dad08730 LP |
129 | return true; |
130 | ||
57f2a956 KS |
131 | return path_startswith(path, "/sys/fs/cgroup/"); |
132 | } | |
133 | ||
134 | bool mount_point_ignore(const char *path) { | |
eaeb18db | 135 | const char *i; |
57f2a956 | 136 | |
eaeb18db LP |
137 | NULSTR_FOREACH(i, ignore_paths) |
138 | if (path_equal(path, i)) | |
949c6510 LP |
139 | return true; |
140 | ||
57f2a956 | 141 | return false; |
dad08730 LP |
142 | } |
143 | ||
4ef31082 | 144 | static int mount_one(const MountPoint *p, bool relabel) { |
713a8875 | 145 | int r, priority; |
8e274523 | 146 | |
ca714c0e | 147 | assert(p); |
8e274523 | 148 | |
713a8875 LP |
149 | priority = (p->mode & MNT_FATAL) ? LOG_ERR : LOG_DEBUG; |
150 | ||
6aa220e0 KS |
151 | if (p->condition_fn && !p->condition_fn()) |
152 | return 0; | |
153 | ||
51b4af2c | 154 | /* Relabel first, just in case */ |
4ef31082 | 155 | if (relabel) |
08c84981 | 156 | (void) label_fix(p->where, LABEL_IGNORE_ENOENT|LABEL_IGNORE_EROFS); |
51b4af2c | 157 | |
e1873695 | 158 | r = path_is_mount_point(p->where, NULL, AT_SYMLINK_FOLLOW); |
1411b094 | 159 | if (r < 0 && r != -ENOENT) { |
713a8875 | 160 | log_full_errno(priority, r, "Failed to determine whether %s is a mount point: %m", p->where); |
1411b094 LP |
161 | return (p->mode & MNT_FATAL) ? r : 0; |
162 | } | |
8e274523 | 163 | if (r > 0) |
51b4af2c | 164 | return 0; |
8e274523 | 165 | |
c481f78b | 166 | /* Skip securityfs in a container */ |
75f86906 | 167 | if (!(p->mode & MNT_IN_CONTAINER) && detect_container() > 0) |
c481f78b LP |
168 | return 0; |
169 | ||
a04f58d6 LP |
170 | /* The access mode here doesn't really matter too much, since |
171 | * the mounted file system will take precedence anyway. */ | |
c4bfd169 | 172 | if (relabel) |
1411b094 | 173 | (void) mkdir_p_label(p->where, 0755); |
c4bfd169 | 174 | else |
1411b094 | 175 | (void) mkdir_p(p->where, 0755); |
a04f58d6 | 176 | |
8e274523 | 177 | log_debug("Mounting %s to %s of type %s with options %s.", |
ca714c0e LP |
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) { | |
713a8875 | 188 | log_full_errno(priority, errno, "Failed to mount %s at %s: %m", p->type, p->where); |
6aa220e0 | 189 | return (p->mode & MNT_FATAL) ? -errno : 0; |
8e274523 LP |
190 | } |
191 | ||
51b4af2c | 192 | /* Relabel again, since we now mounted something fresh here */ |
4ef31082 | 193 | if (relabel) |
08c84981 | 194 | (void) label_fix(p->where, 0); |
5275d3c1 | 195 | |
e07aefbd | 196 | if (p->mode & MNT_CHECK_WRITABLE) { |
713a8875 LP |
197 | if (access(p->where, W_OK) < 0) { |
198 | r = -errno; | |
199 | ||
e07aefbd | 200 | (void) umount(p->where); |
1ff654e2 | 201 | (void) rmdir(p->where); |
713a8875 LP |
202 | |
203 | log_full_errno(priority, r, "Mount point %s not writable after mounting: %m", p->where); | |
e07aefbd CB |
204 | return (p->mode & MNT_FATAL) ? r : 0; |
205 | } | |
206 | } | |
207 | ||
0c85a4f3 | 208 | return 1; |
8e274523 LP |
209 | } |
210 | ||
400fac06 | 211 | static int mount_points_setup(unsigned n, bool loaded_policy) { |
4ef31082 LP |
212 | unsigned i; |
213 | int r = 0; | |
214 | ||
400fac06 | 215 | for (i = 0; i < n; i ++) { |
4ef31082 LP |
216 | int j; |
217 | ||
400fac06 | 218 | j = mount_one(mount_table + i, loaded_policy); |
7ff307bc | 219 | if (j != 0 && r >= 0) |
4ef31082 LP |
220 | r = j; |
221 | } | |
222 | ||
223 | return r; | |
224 | } | |
225 | ||
400fac06 AK |
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 | ||
143fadf3 LP |
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) { | |
a6b26d90 | 287 | _cleanup_set_free_free_ Set *controllers = NULL; |
a641dcd9 | 288 | int r; |
2076ca54 | 289 | |
efdb0237 LP |
290 | if (!cg_is_legacy_wanted()) |
291 | return 0; | |
292 | ||
670802d4 | 293 | /* Mount all available cgroup controllers that are built into the kernel. */ |
6925a0de | 294 | r = cg_kernel_controllers(&controllers); |
b12afc8c LP |
295 | if (r < 0) |
296 | return log_error_errno(r, "Failed to enumerate cgroup controllers: %m"); | |
0c85a4f3 LP |
297 | |
298 | for (;;) { | |
a641dcd9 | 299 | _cleanup_free_ char *options = NULL, *controller = NULL, *where = NULL; |
143fadf3 | 300 | const char *other_controller; |
a6b26d90 ZJS |
301 | MountPoint p = { |
302 | .what = "cgroup", | |
303 | .type = "cgroup", | |
304 | .flags = MS_NOSUID|MS_NOEXEC|MS_NODEV, | |
305 | .mode = MNT_IN_CONTAINER, | |
306 | }; | |
0c85a4f3 LP |
307 | |
308 | controller = set_steal_first(controllers); | |
309 | if (!controller) | |
310 | break; | |
311 | ||
143fadf3 LP |
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(); | |
0c85a4f3 | 328 | } |
143fadf3 | 329 | } |
0c85a4f3 | 330 | |
143fadf3 LP |
331 | /* The simple case, where there's only one controller to mount together */ |
332 | if (!options) | |
ae2a15bc | 333 | options = TAKE_PTR(controller); |
0c85a4f3 | 334 | |
b910cc72 | 335 | where = path_join("/sys/fs/cgroup", options); |
a641dcd9 LP |
336 | if (!where) |
337 | return log_oom(); | |
338 | ||
339 | p.where = where; | |
0c85a4f3 | 340 | p.options = options; |
2076ca54 | 341 | |
4ef31082 | 342 | r = mount_one(&p, true); |
a6b26d90 ZJS |
343 | if (r < 0) |
344 | return r; | |
0c85a4f3 | 345 | |
143fadf3 LP |
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); | |
2076ca54 LP |
351 | } |
352 | ||
143fadf3 | 353 | /* Now that we mounted everything, let's make the tmpfs the cgroup file systems are mounted into read-only. */ |
b12afc8c | 354 | (void) mount("tmpfs", "/sys/fs/cgroup", "tmpfs", MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME|MS_RDONLY, "mode=755"); |
679142ce | 355 | |
a6b26d90 | 356 | return 0; |
2076ca54 LP |
357 | } |
358 | ||
f9fa32f0 | 359 | #if HAVE_SELINUX || ENABLE_SMACK |
1829dc9d LP |
360 | static int nftw_cb( |
361 | const char *fpath, | |
362 | const struct stat *sb, | |
363 | int tflag, | |
364 | struct FTW *ftwbuf) { | |
365 | ||
9fe117ea | 366 | /* No need to label /dev twice in a row... */ |
edb49778 LP |
367 | if (_unlikely_(ftwbuf->level == 0)) |
368 | return FTW_CONTINUE; | |
369 | ||
08c84981 | 370 | (void) label_fix(fpath, 0); |
af65c248 | 371 | |
edb49778 | 372 | /* /run/initramfs is static data and big, no need to |
af65c248 | 373 | * dynamically relabel its contents at boot... */ |
edb49778 LP |
374 | if (_unlikely_(ftwbuf->level == 1 && |
375 | tflag == FTW_D && | |
376 | streq(fpath, "/run/initramfs"))) | |
377 | return FTW_SKIP_SUBTREE; | |
9fe117ea | 378 | |
edb49778 | 379 | return FTW_CONTINUE; |
1829dc9d | 380 | }; |
6f7729c1 KN |
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. */ | |
771b7ead | 392 | if (statfs("/sys/fs/cgroup", &st) < 0) |
6f7729c1 | 393 | return log_error_errno(errno, "Failed to determine mount flags for /sys/fs/cgroup: %m"); |
6f7729c1 KN |
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); | |
771b7ead | 399 | (void) nftw("/sys/fs/cgroup", nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL); |
6f7729c1 KN |
400 | |
401 | if (st.f_flags & ST_RDONLY) | |
402 | (void) mount(NULL, "/sys/fs/cgroup", NULL, MS_REMOUNT|MS_RDONLY, NULL); | |
771b7ead | 403 | |
6f7729c1 KN |
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 | } | |
65e183d7 LP |
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 | } | |
0fff82e5 | 503 | #endif |
1829dc9d | 504 | |
0b3325e7 | 505 | int mount_setup(bool loaded_policy) { |
68d4c452 | 506 | int r = 0; |
8e274523 | 507 | |
400fac06 | 508 | r = mount_points_setup(ELEMENTSOF(mount_table), loaded_policy); |
68d4c452 LP |
509 | if (r < 0) |
510 | return r; | |
511 | ||
f9fa32f0 | 512 | #if HAVE_SELINUX || ENABLE_SMACK |
f1d19aa4 LP |
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. */ | |
0b3325e7 LP |
517 | if (loaded_policy) { |
518 | usec_t before_relabel, after_relabel; | |
519 | char timespan[FORMAT_TIMESPAN_MAX]; | |
c4217b43 | 520 | const char *i; |
65e183d7 | 521 | int n_extra; |
0b3325e7 LP |
522 | |
523 | before_relabel = now(CLOCK_MONOTONIC); | |
524 | ||
c4217b43 LP |
525 | FOREACH_STRING(i, "/dev", "/dev/shm", "/run") |
526 | (void) nftw(i, nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL); | |
0b3325e7 | 527 | |
70a74ec6 | 528 | (void) relabel_cgroup_filesystems(); |
8739f23e | 529 | |
65e183d7 LP |
530 | n_extra = relabel_extra(); |
531 | ||
0b3325e7 LP |
532 | after_relabel = now(CLOCK_MONOTONIC); |
533 | ||
65e183d7 LP |
534 | log_info("Relabelled /dev, /dev/shm, /run, /sys/fs/cgroup%s in %s.", |
535 | n_extra > 0 ? ", additional files" : "", | |
2fa4092c | 536 | format_timespan(timespan, sizeof(timespan), after_relabel - before_relabel, 0)); |
3bbecb2f | 537 | } |
0fff82e5 | 538 | #endif |
1829dc9d | 539 | |
5c0532d1 | 540 | /* Create a few default symlinks, which are normally created |
f1d19aa4 | 541 | * by udevd, but some scripts might need them before we start |
5c0532d1 | 542 | * udevd. */ |
03cfe0d5 | 543 | dev_setup(NULL, UID_INVALID, GID_INVALID); |
5c0532d1 | 544 | |
dee22f39 LP |
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). */ | |
75f86906 | 551 | if (detect_container() <= 0) |
c481f78b | 552 | if (mount(NULL, "/", NULL, MS_REC|MS_SHARED, NULL) < 0) |
56f64d95 | 553 | log_warning_errno(errno, "Failed to set up the root directory for shared mount propagation: %m"); |
b3ac5f8c | 554 | |
dee22f39 LP |
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. */ | |
c4b41707 AP |
558 | (void) mkdir_label("/run/systemd", 0755); |
559 | (void) mkdir_label("/run/systemd/system", 0755); | |
dee22f39 | 560 | |
30874dda LP |
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); | |
fe80fcc7 | 564 | |
0c85a4f3 | 565 | return 0; |
8e274523 | 566 | } |