Branch data Line data Source code
1 : : /* SPDX-License-Identifier: LGPL-2.1+ */
2 : :
3 : : #include <errno.h>
4 : : #include <ftw.h>
5 : : #include <stdlib.h>
6 : : #include <sys/mount.h>
7 : : #include <sys/statvfs.h>
8 : : #include <unistd.h>
9 : :
10 : : #include "alloc-util.h"
11 : : #include "bus-util.h"
12 : : #include "cgroup-util.h"
13 : : #include "dev-setup.h"
14 : : #include "dirent-util.h"
15 : : #include "efivars.h"
16 : : #include "fd-util.h"
17 : : #include "fileio.h"
18 : : #include "fs-util.h"
19 : : #include "label.h"
20 : : #include "log.h"
21 : : #include "macro.h"
22 : : #include "missing.h"
23 : : #include "mkdir.h"
24 : : #include "mount-setup.h"
25 : : #include "mountpoint-util.h"
26 : : #include "nulstr-util.h"
27 : : #include "path-util.h"
28 : : #include "set.h"
29 : : #include "smack-util.h"
30 : : #include "strv.h"
31 : : #include "user-util.h"
32 : : #include "virt.h"
33 : :
34 : : typedef enum MountMode {
35 : : MNT_NONE = 0,
36 : : MNT_FATAL = 1 << 0,
37 : : MNT_IN_CONTAINER = 1 << 1,
38 : : MNT_CHECK_WRITABLE = 1 << 2,
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
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. */
55 : : #if ENABLE_SMACK
56 : : #define N_EARLY_MOUNT 5
57 : : #else
58 : : #define N_EARLY_MOUNT 4
59 : : #endif
60 : :
61 : : static const MountPoint mount_table[] = {
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 },
70 : : #if ENABLE_SMACK
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 },
75 : : #endif
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 },
80 : : #if ENABLE_SMACK
81 : : { "tmpfs", "/run", "tmpfs", "mode=755,smackfsroot=*", MS_NOSUID|MS_NODEV|MS_STRICTATIME,
82 : : mac_smack_use, MNT_FATAL },
83 : : #endif
84 : : { "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME,
85 : : NULL, MNT_FATAL|MNT_IN_CONTAINER },
86 : : { "cgroup2", "/sys/fs/cgroup", "cgroup2", "nsdelegate", MS_NOSUID|MS_NOEXEC|MS_NODEV,
87 : : cg_is_unified_wanted, MNT_IN_CONTAINER|MNT_CHECK_WRITABLE },
88 : : { "cgroup2", "/sys/fs/cgroup", "cgroup2", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
89 : : cg_is_unified_wanted, MNT_IN_CONTAINER|MNT_CHECK_WRITABLE },
90 : : { "tmpfs", "/sys/fs/cgroup", "tmpfs", "mode=755", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME,
91 : : cg_is_legacy_wanted, MNT_FATAL|MNT_IN_CONTAINER },
92 : : { "cgroup2", "/sys/fs/cgroup/unified", "cgroup2", "nsdelegate", MS_NOSUID|MS_NOEXEC|MS_NODEV,
93 : : cg_is_hybrid_wanted, MNT_IN_CONTAINER|MNT_CHECK_WRITABLE },
94 : : { "cgroup2", "/sys/fs/cgroup/unified", "cgroup2", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
95 : : cg_is_hybrid_wanted, MNT_IN_CONTAINER|MNT_CHECK_WRITABLE },
96 : : { "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd,xattr", MS_NOSUID|MS_NOEXEC|MS_NODEV,
97 : : cg_is_legacy_wanted, MNT_IN_CONTAINER },
98 : : { "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd", MS_NOSUID|MS_NOEXEC|MS_NODEV,
99 : : cg_is_legacy_wanted, MNT_FATAL|MNT_IN_CONTAINER },
100 : : { "pstore", "/sys/fs/pstore", "pstore", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
101 : : NULL, MNT_NONE },
102 : : #if ENABLE_EFI
103 : : { "efivarfs", "/sys/firmware/efi/efivars", "efivarfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV,
104 : : is_efi_boot, MNT_NONE },
105 : : #endif
106 : : { "bpf", "/sys/fs/bpf", "bpf", "mode=700", MS_NOSUID|MS_NOEXEC|MS_NODEV,
107 : : NULL, MNT_NONE, },
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"
116 : : /* Container bind mounts */
117 : : "/proc/sys\0"
118 : : "/dev/console\0"
119 : : "/proc/kmsg\0";
120 : :
121 : 2728 : 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 [ + + ]: 49932 : for (i = 0; i < ELEMENTSOF(mount_table); i ++)
128 [ + + ]: 47828 : if (path_equal(path, mount_table[i].where))
129 : 624 : return true;
130 : :
131 : 2104 : return path_startswith(path, "/sys/fs/cgroup/");
132 : : }
133 : :
134 : 1584 : bool mount_point_ignore(const char *path) {
135 : : const char *i;
136 : :
137 [ + - + + ]: 7728 : NULSTR_FOREACH(i, ignore_paths)
138 [ + + ]: 6192 : if (path_equal(path, i))
139 : 48 : return true;
140 : :
141 : 1536 : return false;
142 : : }
143 : :
144 : 0 : static int mount_one(const MountPoint *p, bool relabel) {
145 : : int r, priority;
146 : :
147 [ # # ]: 0 : assert(p);
148 : :
149 [ # # ]: 0 : priority = (p->mode & MNT_FATAL) ? LOG_ERR : LOG_DEBUG;
150 : :
151 [ # # # # ]: 0 : if (p->condition_fn && !p->condition_fn())
152 : 0 : return 0;
153 : :
154 : : /* Relabel first, just in case */
155 [ # # ]: 0 : if (relabel)
156 : 0 : (void) label_fix(p->where, LABEL_IGNORE_ENOENT|LABEL_IGNORE_EROFS);
157 : :
158 : 0 : r = path_is_mount_point(p->where, NULL, AT_SYMLINK_FOLLOW);
159 [ # # # # ]: 0 : if (r < 0 && r != -ENOENT) {
160 [ # # ]: 0 : log_full_errno(priority, r, "Failed to determine whether %s is a mount point: %m", p->where);
161 [ # # ]: 0 : return (p->mode & MNT_FATAL) ? r : 0;
162 : : }
163 [ # # ]: 0 : if (r > 0)
164 : 0 : return 0;
165 : :
166 : : /* Skip securityfs in a container */
167 [ # # # # ]: 0 : if (!(p->mode & MNT_IN_CONTAINER) && detect_container() > 0)
168 : 0 : return 0;
169 : :
170 : : /* The access mode here doesn't really matter too much, since
171 : : * the mounted file system will take precedence anyway. */
172 [ # # ]: 0 : if (relabel)
173 : 0 : (void) mkdir_p_label(p->where, 0755);
174 : : else
175 : 0 : (void) mkdir_p(p->where, 0755);
176 : :
177 [ # # ]: 0 : 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 [ # # ]: 0 : if (mount(p->what,
184 : : p->where,
185 : : p->type,
186 : : p->flags,
187 : 0 : p->options) < 0) {
188 [ # # ]: 0 : log_full_errno(priority, errno, "Failed to mount %s at %s: %m", p->type, p->where);
189 [ # # ]: 0 : return (p->mode & MNT_FATAL) ? -errno : 0;
190 : : }
191 : :
192 : : /* Relabel again, since we now mounted something fresh here */
193 [ # # ]: 0 : if (relabel)
194 : 0 : (void) label_fix(p->where, 0);
195 : :
196 [ # # ]: 0 : if (p->mode & MNT_CHECK_WRITABLE) {
197 [ # # ]: 0 : if (access(p->where, W_OK) < 0) {
198 : 0 : r = -errno;
199 : :
200 : 0 : (void) umount(p->where);
201 : 0 : (void) rmdir(p->where);
202 : :
203 [ # # ]: 0 : log_full_errno(priority, r, "Mount point %s not writable after mounting: %m", p->where);
204 [ # # ]: 0 : return (p->mode & MNT_FATAL) ? r : 0;
205 : : }
206 : : }
207 : :
208 : 0 : return 1;
209 : : }
210 : :
211 : 0 : static int mount_points_setup(unsigned n, bool loaded_policy) {
212 : : unsigned i;
213 : 0 : int r = 0;
214 : :
215 [ # # ]: 0 : for (i = 0; i < n; i ++) {
216 : : int j;
217 : :
218 : 0 : j = mount_one(mount_table + i, loaded_policy);
219 [ # # # # ]: 0 : if (j != 0 && r >= 0)
220 : 0 : r = j;
221 : : }
222 : :
223 : 0 : return r;
224 : : }
225 : :
226 : 0 : 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 : 0 : return mount_points_setup(N_EARLY_MOUNT, false);
232 : : }
233 : :
234 : 0 : 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 [ # # ]: 0 : 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 [ # # # # : 0 : STRV_FOREACH_PAIR(x, y, pairs) {
# # ]
251 [ # # ]: 0 : if (streq(controller, *x))
252 : 0 : return *y;
253 [ # # ]: 0 : if (streq(controller, *y))
254 : 0 : return *x;
255 : : }
256 : :
257 : 0 : return NULL;
258 : : }
259 : :
260 : 0 : static int symlink_controller(const char *target, const char *alias) {
261 : : const char *a;
262 : : int r;
263 : :
264 [ # # ]: 0 : assert(target);
265 [ # # ]: 0 : assert(alias);
266 : :
267 [ # # # # : 0 : a = strjoina("/sys/fs/cgroup/", alias);
# # # # #
# # # ]
268 : :
269 : 0 : r = symlink_idempotent(target, a, false);
270 [ # # ]: 0 : if (r < 0)
271 [ # # ]: 0 : 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 : 0 : return 0;
284 : : }
285 : :
286 : 0 : int mount_cgroup_controllers(void) {
287 : 0 : _cleanup_set_free_free_ Set *controllers = NULL;
288 : : int r;
289 : :
290 [ # # ]: 0 : if (!cg_is_legacy_wanted())
291 : 0 : return 0;
292 : :
293 : : /* Mount all available cgroup controllers that are built into the kernel. */
294 : 0 : r = cg_kernel_controllers(&controllers);
295 [ # # ]: 0 : if (r < 0)
296 [ # # ]: 0 : return log_error_errno(r, "Failed to enumerate cgroup controllers: %m");
297 : :
298 : 0 : for (;;) {
299 [ # # # # : 0 : _cleanup_free_ char *options = NULL, *controller = NULL, *where = NULL;
# # # #
# ]
300 : : const char *other_controller;
301 : 0 : MountPoint p = {
302 : : .what = "cgroup",
303 : : .type = "cgroup",
304 : : .flags = MS_NOSUID|MS_NOEXEC|MS_NODEV,
305 : : .mode = MNT_IN_CONTAINER,
306 : : };
307 : :
308 : 0 : controller = set_steal_first(controllers);
309 [ # # ]: 0 : if (!controller)
310 : 0 : break;
311 : :
312 : : /* Check if we shall mount this together with another controller */
313 : 0 : other_controller = join_with(controller);
314 [ # # ]: 0 : if (other_controller) {
315 [ # # ]: 0 : _cleanup_free_ char *c = NULL;
316 : :
317 : : /* Check if the other controller is actually available in the kernel too */
318 : 0 : c = set_remove(controllers, other_controller);
319 [ # # ]: 0 : if (c) {
320 : :
321 : : /* Join the two controllers into one string, and maintain a stable ordering */
322 [ # # ]: 0 : if (strcmp(controller, other_controller) < 0)
323 : 0 : options = strjoin(controller, ",", other_controller);
324 : : else
325 : 0 : options = strjoin(other_controller, ",", controller);
326 [ # # ]: 0 : if (!options)
327 : 0 : return log_oom();
328 : : }
329 : : }
330 : :
331 : : /* The simple case, where there's only one controller to mount together */
332 [ # # ]: 0 : if (!options)
333 : 0 : options = TAKE_PTR(controller);
334 : :
335 : 0 : where = path_join("/sys/fs/cgroup", options);
336 [ # # ]: 0 : if (!where)
337 : 0 : return log_oom();
338 : :
339 : 0 : p.where = where;
340 : 0 : p.options = options;
341 : :
342 : 0 : r = mount_one(&p, true);
343 [ # # ]: 0 : if (r < 0)
344 : 0 : return r;
345 : :
346 : : /* Create symlinks from the individual controller names, in case we have a joined mount */
347 [ # # ]: 0 : if (controller)
348 : 0 : (void) symlink_controller(options, controller);
349 [ # # ]: 0 : if (other_controller)
350 : 0 : (void) symlink_controller(options, other_controller);
351 : : }
352 : :
353 : : /* Now that we mounted everything, let's make the tmpfs the cgroup file systems are mounted into read-only. */
354 : 0 : (void) mount("tmpfs", "/sys/fs/cgroup", "tmpfs", MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME|MS_RDONLY, "mode=755");
355 : :
356 : 0 : return 0;
357 : : }
358 : :
359 : : #if HAVE_SELINUX || ENABLE_SMACK
360 : 0 : 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 [ # # ]: 0 : if (_unlikely_(ftwbuf->level == 0))
368 : 0 : return FTW_CONTINUE;
369 : :
370 : 0 : (void) label_fix(fpath, 0);
371 : :
372 : : /* /run/initramfs is static data and big, no need to
373 : : * dynamically relabel its contents at boot... */
374 [ # # # # : 0 : if (_unlikely_(ftwbuf->level == 1 &&
# # # # ]
375 : : tflag == FTW_D &&
376 : : streq(fpath, "/run/initramfs")))
377 : 0 : return FTW_SKIP_SUBTREE;
378 : :
379 : 0 : return FTW_CONTINUE;
380 : : };
381 : :
382 : 0 : static int relabel_cgroup_filesystems(void) {
383 : : int r;
384 : : struct statfs st;
385 : :
386 : 0 : r = cg_all_unified();
387 [ # # ]: 0 : 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 [ # # ]: 0 : if (statfs("/sys/fs/cgroup", &st) < 0)
393 [ # # ]: 0 : return log_error_errno(errno, "Failed to determine mount flags for /sys/fs/cgroup: %m");
394 : :
395 [ # # ]: 0 : if (st.f_flags & ST_RDONLY)
396 : 0 : (void) mount(NULL, "/sys/fs/cgroup", NULL, MS_REMOUNT, NULL);
397 : :
398 : 0 : (void) label_fix("/sys/fs/cgroup", 0);
399 : 0 : (void) nftw("/sys/fs/cgroup", nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL);
400 : :
401 [ # # ]: 0 : if (st.f_flags & ST_RDONLY)
402 : 0 : (void) mount(NULL, "/sys/fs/cgroup", NULL, MS_REMOUNT|MS_RDONLY, NULL);
403 : :
404 [ # # ]: 0 : } else if (r < 0)
405 [ # # ]: 0 : return log_error_errno(r, "Failed to determine whether we are in all unified mode: %m");
406 : :
407 : 0 : return 0;
408 : : }
409 : :
410 : 0 : static int relabel_extra(void) {
411 : 0 : _cleanup_closedir_ DIR *d = NULL;
412 : 0 : 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 : 0 : d = opendir("/run/systemd/relabel-extra.d/");
423 [ # # ]: 0 : if (!d) {
424 [ # # ]: 0 : if (errno == ENOENT)
425 : 0 : return 0;
426 : :
427 [ # # ]: 0 : return log_warning_errno(errno, "Failed to open /run/systemd/relabel-extra.d/, ignoring: %m");
428 : : }
429 : :
430 : 0 : for (;;) {
431 [ # # # # ]: 0 : _cleanup_fclose_ FILE *f = NULL;
432 [ # # # # ]: 0 : _cleanup_close_ int fd = -1;
433 : : struct dirent *de;
434 : :
435 : 0 : errno = 0;
436 : 0 : de = readdir_no_dot(d);
437 [ # # ]: 0 : if (!de) {
438 [ # # ]: 0 : if (errno != 0)
439 [ # # ]: 0 : return log_error_errno(errno, "Failed read directory /run/systemd/relabel-extra.d/, ignoring: %m");
440 : 0 : break;
441 : : }
442 : :
443 [ # # ]: 0 : if (hidden_or_backup_file(de->d_name))
444 : 0 : continue;
445 : :
446 [ # # ]: 0 : if (!endswith(de->d_name, ".relabel"))
447 : 0 : continue;
448 : :
449 [ # # # # ]: 0 : if (!IN_SET(de->d_type, DT_REG, DT_UNKNOWN))
450 : 0 : continue;
451 : :
452 : 0 : fd = openat(dirfd(d), de->d_name, O_RDONLY|O_CLOEXEC|O_NONBLOCK);
453 [ # # ]: 0 : if (fd < 0) {
454 [ # # ]: 0 : log_warning_errno(errno, "Failed to open /run/systemd/relabel-extra.d/%s, ignoring: %m", de->d_name);
455 : 0 : continue;
456 : : }
457 : :
458 : 0 : f = fdopen(fd, "r");
459 [ # # ]: 0 : if (!f) {
460 [ # # ]: 0 : log_warning_errno(errno, "Failed to convert file descriptor into file object, ignoring: %m");
461 : 0 : continue;
462 : : }
463 : 0 : TAKE_FD(fd);
464 : :
465 : 0 : for (;;) {
466 [ # # # ]: 0 : _cleanup_free_ char *line = NULL;
467 : :
468 : 0 : r = read_line(f, LONG_LINE_MAX, &line);
469 [ # # ]: 0 : if (r < 0) {
470 [ # # ]: 0 : log_warning_errno(r, "Failed to read from /run/systemd/relabel-extra.d/%s, ignoring: %m", de->d_name);
471 : 0 : break;
472 : : }
473 [ # # ]: 0 : if (r == 0) /* EOF */
474 : 0 : break;
475 : :
476 : 0 : path_simplify(line, true);
477 : :
478 [ # # ]: 0 : if (!path_is_normalized(line)) {
479 [ # # ]: 0 : log_warning("Path to relabel is not normalized, ignoring: %s", line);
480 : 0 : continue;
481 : : }
482 : :
483 [ # # ]: 0 : if (!path_is_absolute(line)) {
484 [ # # ]: 0 : log_warning("Path to relabel is not absolute, ignoring: %s", line);
485 : 0 : continue;
486 : : }
487 : :
488 [ # # ]: 0 : log_debug("Relabelling additional file/directory '%s'.", line);
489 : 0 : (void) nftw(line, nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL);
490 : 0 : c++;
491 : : }
492 : :
493 [ # # ]: 0 : if (unlinkat(dirfd(d), de->d_name, 0) < 0)
494 [ # # ]: 0 : 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 [ # # ]: 0 : if (rmdir("/run/systemd/relabel-extra.d") < 0)
499 [ # # ]: 0 : log_warning_errno(errno, "Failed to remove /run/systemd/relabel-extra.d/ directory: %m");
500 : :
501 : 0 : return c;
502 : : }
503 : : #endif
504 : :
505 : 0 : int mount_setup(bool loaded_policy) {
506 : 0 : int r = 0;
507 : :
508 : 0 : r = mount_points_setup(ELEMENTSOF(mount_table), loaded_policy);
509 [ # # ]: 0 : if (r < 0)
510 : 0 : return r;
511 : :
512 : : #if HAVE_SELINUX || ENABLE_SMACK
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 [ # # ]: 0 : if (loaded_policy) {
518 : : usec_t before_relabel, after_relabel;
519 : : char timespan[FORMAT_TIMESPAN_MAX];
520 : : const char *i;
521 : : int n_extra;
522 : :
523 : 0 : before_relabel = now(CLOCK_MONOTONIC);
524 : :
525 [ # # ]: 0 : FOREACH_STRING(i, "/dev", "/dev/shm", "/run")
526 : 0 : (void) nftw(i, nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL);
527 : :
528 : 0 : (void) relabel_cgroup_filesystems();
529 : :
530 : 0 : n_extra = relabel_extra();
531 : :
532 : 0 : after_relabel = now(CLOCK_MONOTONIC);
533 : :
534 [ # # # # ]: 0 : log_info("Relabelled /dev, /dev/shm, /run, /sys/fs/cgroup%s in %s.",
535 : : n_extra > 0 ? ", additional files" : "",
536 : : format_timespan(timespan, sizeof(timespan), after_relabel - before_relabel, 0));
537 : : }
538 : : #endif
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. */
543 : 0 : dev_setup(NULL, UID_INVALID, GID_INVALID);
544 : :
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). */
551 [ # # ]: 0 : if (detect_container() <= 0)
552 [ # # ]: 0 : if (mount(NULL, "/", NULL, MS_REC|MS_SHARED, NULL) < 0)
553 [ # # ]: 0 : log_warning_errno(errno, "Failed to set up the root directory for shared mount propagation: %m");
554 : :
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. */
558 : 0 : (void) mkdir_label("/run/systemd", 0755);
559 : 0 : (void) mkdir_label("/run/systemd/system", 0755);
560 : :
561 : : /* Also create /run/systemd/inaccessible nodes, so that we always have something to mount inaccessible nodes
562 : : * from. */
563 : 0 : (void) make_inaccessible_nodes(NULL, UID_INVALID, GID_INVALID);
564 : :
565 : 0 : return 0;
566 : : }
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