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d6c9574f | 1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
8e274523 LP |
2 | |
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
8e274523 LP |
11 | (at your option) any later version. |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 16 | Lesser General Public License for more details. |
8e274523 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
8e274523 LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
22 | #include <sys/mount.h> | |
23 | #include <errno.h> | |
24 | #include <sys/stat.h> | |
25 | #include <stdlib.h> | |
26 | #include <string.h> | |
27 | #include <libgen.h> | |
28 | #include <assert.h> | |
5c0532d1 | 29 | #include <unistd.h> |
1829dc9d | 30 | #include <ftw.h> |
8e274523 LP |
31 | |
32 | #include "mount-setup.h" | |
5ba2dc25 | 33 | #include "dev-setup.h" |
8e274523 | 34 | #include "log.h" |
c9af1080 LP |
35 | #include "macro.h" |
36 | #include "util.h" | |
5275d3c1 | 37 | #include "label.h" |
0c85a4f3 LP |
38 | #include "set.h" |
39 | #include "strv.h" | |
49e942b2 | 40 | #include "mkdir.h" |
9eb977db | 41 | #include "path-util.h" |
48ac500b | 42 | #include "missing.h" |
c481f78b | 43 | #include "virt.h" |
34e5a31e | 44 | #include "efivars.h" |
8552b176 | 45 | #include "smack-util.h" |
7f112f50 | 46 | #include "def.h" |
bef2733f | 47 | |
6aa220e0 KS |
48 | typedef enum MountMode { |
49 | MNT_NONE = 0, | |
50 | MNT_FATAL = 1 << 0, | |
51 | MNT_IN_CONTAINER = 1 << 1, | |
52 | } MountMode; | |
53 | ||
ca714c0e LP |
54 | typedef struct MountPoint { |
55 | const char *what; | |
56 | const char *where; | |
57 | const char *type; | |
58 | const char *options; | |
59 | unsigned long flags; | |
6aa220e0 KS |
60 | bool (*condition_fn)(void); |
61 | MountMode mode; | |
ca714c0e LP |
62 | } MountPoint; |
63 | ||
4ef31082 | 64 | /* The first three entries we might need before SELinux is up. The |
160481f6 | 65 | * fourth (securityfs) is needed by IMA to load a custom policy. The |
7c96ab1d LP |
66 | * other ones we can delay until SELinux and IMA are loaded. When |
67 | * SMACK is enabled we need smackfs, too, so it's a fifth one. */ | |
68 | #ifdef HAVE_SMACK | |
ffbd2c4d | 69 | #define N_EARLY_MOUNT 5 |
7c96ab1d LP |
70 | #else |
71 | #define N_EARLY_MOUNT 4 | |
72 | #endif | |
4ef31082 | 73 | |
ca714c0e | 74 | static const MountPoint mount_table[] = { |
6aa220e0 KS |
75 | { "sysfs", "/sys", "sysfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
76 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
d1d8e5d4 RLM |
77 | { "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
78 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
6aa220e0 KS |
79 | { "devtmpfs", "/dev", "devtmpfs", "mode=755", MS_NOSUID|MS_STRICTATIME, |
80 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
81 | { "securityfs", "/sys/kernel/security", "securityfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, | |
82 | NULL, MNT_NONE }, | |
d407c940 | 83 | #ifdef HAVE_SMACK |
8552b176 AK |
84 | { "smackfs", "/sys/fs/smackfs", "smackfs", "smackfsdef=*", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME, |
85 | use_smack, MNT_FATAL }, | |
d407c940 | 86 | { "tmpfs", "/dev/shm", "tmpfs", "mode=1777,smackfsroot=*", MS_NOSUID|MS_NODEV|MS_STRICTATIME, |
8552b176 | 87 | use_smack, MNT_FATAL }, |
d407c940 | 88 | #endif |
6aa220e0 KS |
89 | { "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME, |
90 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
91 | { "devpts", "/dev/pts", "devpts", "mode=620,gid=" STRINGIFY(TTY_GID), MS_NOSUID|MS_NOEXEC, | |
92 | NULL, MNT_IN_CONTAINER }, | |
d407c940 AK |
93 | #ifdef HAVE_SMACK |
94 | { "tmpfs", "/run", "tmpfs", "mode=755,smackfsroot=*", MS_NOSUID|MS_NODEV|MS_STRICTATIME, | |
8552b176 | 95 | use_smack, MNT_FATAL }, |
d407c940 | 96 | #endif |
6aa220e0 KS |
97 | { "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME, |
98 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
99 | { "tmpfs", "/sys/fs/cgroup", "tmpfs", "mode=755", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME, | |
99a17ada | 100 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, |
0ee67958 | 101 | { "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd,xattr", MS_NOSUID|MS_NOEXEC|MS_NODEV, |
908f8b9c | 102 | NULL, MNT_IN_CONTAINER }, |
0ee67958 | 103 | { "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd", MS_NOSUID|MS_NOEXEC|MS_NODEV, |
99a17ada | 104 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, |
c06bf414 KS |
105 | { "pstore", "/sys/fs/pstore", "pstore", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
106 | NULL, MNT_NONE }, | |
107 | #ifdef ENABLE_EFI | |
108 | { "efivarfs", "/sys/firmware/efi/efivars", "efivarfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, | |
109 | is_efi_boot, MNT_NONE }, | |
110 | #endif | |
8e274523 LP |
111 | }; |
112 | ||
949c6510 | 113 | /* These are API file systems that might be mounted by other software, |
46ff0ed7 | 114 | * we just list them here so that we know that we should ignore them */ |
949c6510 | 115 | |
eaeb18db LP |
116 | static const char ignore_paths[] = |
117 | /* SELinux file systems */ | |
118 | "/sys/fs/selinux\0" | |
119 | "/selinux\0" | |
120 | /* Legacy cgroup mount points */ | |
121 | "/dev/cgroup\0" | |
122 | "/cgroup\0" | |
123 | /* Legacy kernel file system */ | |
124 | "/proc/bus/usb\0" | |
125 | /* Container bind mounts */ | |
126 | "/proc/sys\0" | |
127 | "/dev/console\0" | |
c481f78b | 128 | "/proc/kmsg\0"; |
949c6510 | 129 | |
dad08730 LP |
130 | bool mount_point_is_api(const char *path) { |
131 | unsigned i; | |
132 | ||
133 | /* Checks if this mount point is considered "API", and hence | |
134 | * should be ignored */ | |
135 | ||
ca714c0e | 136 | for (i = 0; i < ELEMENTSOF(mount_table); i ++) |
449ddb2d | 137 | if (path_equal(path, mount_table[i].where)) |
dad08730 LP |
138 | return true; |
139 | ||
57f2a956 KS |
140 | return path_startswith(path, "/sys/fs/cgroup/"); |
141 | } | |
142 | ||
143 | bool mount_point_ignore(const char *path) { | |
eaeb18db | 144 | const char *i; |
57f2a956 | 145 | |
eaeb18db LP |
146 | NULSTR_FOREACH(i, ignore_paths) |
147 | if (path_equal(path, i)) | |
949c6510 LP |
148 | return true; |
149 | ||
57f2a956 | 150 | return false; |
dad08730 LP |
151 | } |
152 | ||
4ef31082 | 153 | static int mount_one(const MountPoint *p, bool relabel) { |
8e274523 LP |
154 | int r; |
155 | ||
ca714c0e | 156 | assert(p); |
8e274523 | 157 | |
6aa220e0 KS |
158 | if (p->condition_fn && !p->condition_fn()) |
159 | return 0; | |
160 | ||
51b4af2c | 161 | /* Relabel first, just in case */ |
4ef31082 | 162 | if (relabel) |
c9bc0764 | 163 | label_fix(p->where, true, true); |
51b4af2c | 164 | |
c481f78b LP |
165 | r = path_is_mount_point(p->where, true); |
166 | if (r < 0) | |
8e274523 LP |
167 | return r; |
168 | ||
169 | if (r > 0) | |
51b4af2c | 170 | return 0; |
8e274523 | 171 | |
c481f78b | 172 | /* Skip securityfs in a container */ |
6aa220e0 | 173 | if (!(p->mode & MNT_IN_CONTAINER) && detect_container(NULL) > 0) |
c481f78b LP |
174 | return 0; |
175 | ||
a04f58d6 LP |
176 | /* The access mode here doesn't really matter too much, since |
177 | * the mounted file system will take precedence anyway. */ | |
c4bfd169 LP |
178 | if (relabel) |
179 | mkdir_p_label(p->where, 0755); | |
180 | else | |
181 | mkdir_p(p->where, 0755); | |
a04f58d6 | 182 | |
8e274523 | 183 | log_debug("Mounting %s to %s of type %s with options %s.", |
ca714c0e LP |
184 | p->what, |
185 | p->where, | |
186 | p->type, | |
187 | strna(p->options)); | |
188 | ||
189 | if (mount(p->what, | |
190 | p->where, | |
191 | p->type, | |
192 | p->flags, | |
193 | p->options) < 0) { | |
99a17ada | 194 | log_full((p->mode & MNT_FATAL) ? LOG_ERR : LOG_DEBUG, "Failed to mount %s at %s: %m", p->type, p->where); |
6aa220e0 | 195 | return (p->mode & MNT_FATAL) ? -errno : 0; |
8e274523 LP |
196 | } |
197 | ||
51b4af2c | 198 | /* Relabel again, since we now mounted something fresh here */ |
4ef31082 | 199 | if (relabel) |
c9bc0764 | 200 | label_fix(p->where, false, false); |
5275d3c1 | 201 | |
0c85a4f3 | 202 | return 1; |
8e274523 LP |
203 | } |
204 | ||
4ef31082 LP |
205 | int mount_setup_early(void) { |
206 | unsigned i; | |
207 | int r = 0; | |
208 | ||
209 | assert_cc(N_EARLY_MOUNT <= ELEMENTSOF(mount_table)); | |
210 | ||
211 | /* Do a minimal mount of /proc and friends to enable the most | |
212 | * basic stuff, such as SELinux */ | |
213 | for (i = 0; i < N_EARLY_MOUNT; i ++) { | |
214 | int j; | |
215 | ||
216 | j = mount_one(mount_table + i, false); | |
217 | if (r == 0) | |
218 | r = j; | |
219 | } | |
220 | ||
221 | return r; | |
222 | } | |
223 | ||
0c85a4f3 | 224 | int mount_cgroup_controllers(char ***join_controllers) { |
a6b26d90 ZJS |
225 | _cleanup_set_free_free_ Set *controllers = NULL; |
226 | _cleanup_fclose_ FILE *f; | |
a641dcd9 LP |
227 | char buf[LINE_MAX]; |
228 | int r; | |
2076ca54 | 229 | |
670802d4 | 230 | /* Mount all available cgroup controllers that are built into the kernel. */ |
2076ca54 | 231 | |
0c85a4f3 LP |
232 | f = fopen("/proc/cgroups", "re"); |
233 | if (!f) { | |
016e9849 LP |
234 | log_error("Failed to enumerate cgroup controllers: %m"); |
235 | return 0; | |
236 | } | |
2076ca54 | 237 | |
d5099efc | 238 | controllers = set_new(&string_hash_ops); |
a6b26d90 ZJS |
239 | if (!controllers) |
240 | return log_oom(); | |
0c85a4f3 | 241 | |
2076ca54 | 242 | /* Ignore the header line */ |
bab45044 | 243 | (void) fgets(buf, sizeof(buf), f); |
2076ca54 LP |
244 | |
245 | for (;;) { | |
0c85a4f3 LP |
246 | char *controller; |
247 | int enabled = 0; | |
2076ca54 | 248 | |
16f6682d | 249 | if (fscanf(f, "%ms %*i %*i %i", &controller, &enabled) != 2) { |
2076ca54 LP |
250 | |
251 | if (feof(f)) | |
252 | break; | |
253 | ||
254 | log_error("Failed to parse /proc/cgroups."); | |
a6b26d90 | 255 | return -EIO; |
2076ca54 LP |
256 | } |
257 | ||
600a328f LP |
258 | if (!enabled) { |
259 | free(controller); | |
260 | continue; | |
261 | } | |
262 | ||
ef42202a | 263 | r = set_consume(controllers, controller); |
0c85a4f3 LP |
264 | if (r < 0) { |
265 | log_error("Failed to add controller to set."); | |
a6b26d90 | 266 | return r; |
0c85a4f3 LP |
267 | } |
268 | } | |
269 | ||
270 | for (;;) { | |
a641dcd9 | 271 | _cleanup_free_ char *options = NULL, *controller = NULL, *where = NULL; |
a6b26d90 ZJS |
272 | MountPoint p = { |
273 | .what = "cgroup", | |
274 | .type = "cgroup", | |
275 | .flags = MS_NOSUID|MS_NOEXEC|MS_NODEV, | |
276 | .mode = MNT_IN_CONTAINER, | |
277 | }; | |
0c85a4f3 LP |
278 | char ***k = NULL; |
279 | ||
280 | controller = set_steal_first(controllers); | |
281 | if (!controller) | |
282 | break; | |
283 | ||
284 | if (join_controllers) | |
285 | for (k = join_controllers; *k; k++) | |
286 | if (strv_find(*k, controller)) | |
287 | break; | |
288 | ||
289 | if (k && *k) { | |
290 | char **i, **j; | |
291 | ||
292 | for (i = *k, j = *k; *i; i++) { | |
293 | ||
294 | if (!streq(*i, controller)) { | |
a641dcd9 | 295 | _cleanup_free_ char *t; |
0c85a4f3 LP |
296 | |
297 | t = set_remove(controllers, *i); | |
298 | if (!t) { | |
299 | free(*i); | |
300 | continue; | |
301 | } | |
0c85a4f3 LP |
302 | } |
303 | ||
304 | *(j++) = *i; | |
305 | } | |
306 | ||
307 | *j = NULL; | |
308 | ||
309 | options = strv_join(*k, ","); | |
a6b26d90 ZJS |
310 | if (!options) |
311 | return log_oom(); | |
0c85a4f3 LP |
312 | } else { |
313 | options = controller; | |
314 | controller = NULL; | |
315 | } | |
316 | ||
a641dcd9 LP |
317 | where = strappend("/sys/fs/cgroup/", options); |
318 | if (!where) | |
319 | return log_oom(); | |
320 | ||
321 | p.where = where; | |
0c85a4f3 | 322 | p.options = options; |
2076ca54 | 323 | |
4ef31082 | 324 | r = mount_one(&p, true); |
a6b26d90 ZJS |
325 | if (r < 0) |
326 | return r; | |
0c85a4f3 LP |
327 | |
328 | if (r > 0 && k && *k) { | |
329 | char **i; | |
330 | ||
331 | for (i = *k; *i; i++) { | |
a641dcd9 LP |
332 | _cleanup_free_ char *t = NULL; |
333 | ||
334 | t = strappend("/sys/fs/cgroup/", *i); | |
335 | if (!t) | |
336 | return log_oom(); | |
0c85a4f3 LP |
337 | |
338 | r = symlink(options, t); | |
0c85a4f3 | 339 | if (r < 0 && errno != EEXIST) { |
c79bb9e4 | 340 | log_error("Failed to create symlink %s: %m", t); |
a6b26d90 | 341 | return -errno; |
0c85a4f3 LP |
342 | } |
343 | } | |
344 | } | |
2076ca54 LP |
345 | } |
346 | ||
679142ce LP |
347 | /* Now that we mounted everything, let's make the tmpfs the |
348 | * cgroup file systems are mounted into read-only. */ | |
349 | mount("tmpfs", "/sys/fs/cgroup", "tmpfs", MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME|MS_RDONLY, "mode=755"); | |
350 | ||
a6b26d90 | 351 | return 0; |
2076ca54 LP |
352 | } |
353 | ||
0fff82e5 | 354 | #if defined(HAVE_SELINUX) || defined(HAVE_SMACK) |
1829dc9d LP |
355 | static int nftw_cb( |
356 | const char *fpath, | |
357 | const struct stat *sb, | |
358 | int tflag, | |
359 | struct FTW *ftwbuf) { | |
360 | ||
9fe117ea | 361 | /* No need to label /dev twice in a row... */ |
edb49778 LP |
362 | if (_unlikely_(ftwbuf->level == 0)) |
363 | return FTW_CONTINUE; | |
364 | ||
c9bc0764 | 365 | label_fix(fpath, false, false); |
af65c248 | 366 | |
edb49778 | 367 | /* /run/initramfs is static data and big, no need to |
af65c248 | 368 | * dynamically relabel its contents at boot... */ |
edb49778 LP |
369 | if (_unlikely_(ftwbuf->level == 1 && |
370 | tflag == FTW_D && | |
371 | streq(fpath, "/run/initramfs"))) | |
372 | return FTW_SKIP_SUBTREE; | |
9fe117ea | 373 | |
edb49778 | 374 | return FTW_CONTINUE; |
1829dc9d | 375 | }; |
0fff82e5 | 376 | #endif |
1829dc9d | 377 | |
0b3325e7 | 378 | int mount_setup(bool loaded_policy) { |
8e274523 | 379 | int r; |
dad08730 | 380 | unsigned i; |
8e274523 | 381 | |
4ef31082 LP |
382 | for (i = 0; i < ELEMENTSOF(mount_table); i ++) { |
383 | r = mount_one(mount_table + i, true); | |
384 | ||
385 | if (r < 0) | |
8e274523 | 386 | return r; |
4ef31082 | 387 | } |
8e274523 | 388 | |
0fff82e5 | 389 | #if defined(HAVE_SELINUX) || defined(HAVE_SMACK) |
f1d19aa4 LP |
390 | /* Nodes in devtmpfs and /run need to be manually updated for |
391 | * the appropriate labels, after mounting. The other virtual | |
392 | * API file systems like /sys and /proc do not need that, they | |
393 | * use the same label for all their files. */ | |
0b3325e7 LP |
394 | if (loaded_policy) { |
395 | usec_t before_relabel, after_relabel; | |
396 | char timespan[FORMAT_TIMESPAN_MAX]; | |
397 | ||
398 | before_relabel = now(CLOCK_MONOTONIC); | |
399 | ||
edb49778 LP |
400 | nftw("/dev", nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL); |
401 | nftw("/run", nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL); | |
0b3325e7 LP |
402 | |
403 | after_relabel = now(CLOCK_MONOTONIC); | |
404 | ||
405 | log_info("Relabelled /dev and /run in %s.", | |
2fa4092c | 406 | format_timespan(timespan, sizeof(timespan), after_relabel - before_relabel, 0)); |
3bbecb2f | 407 | } |
0fff82e5 | 408 | #endif |
1829dc9d | 409 | |
5c0532d1 | 410 | /* Create a few default symlinks, which are normally created |
f1d19aa4 | 411 | * by udevd, but some scripts might need them before we start |
5c0532d1 | 412 | * udevd. */ |
01ed0e23 | 413 | dev_setup(NULL); |
5c0532d1 | 414 | |
b3ac5f8c LP |
415 | /* Mark the root directory as shared in regards to mount |
416 | * propagation. The kernel defaults to "private", but we think | |
417 | * it makes more sense to have a default of "shared" so that | |
418 | * nspawn and the container tools work out of the box. If | |
419 | * specific setups need other settings they can reset the | |
420 | * propagation mode to private if needed. */ | |
c481f78b LP |
421 | if (detect_container(NULL) <= 0) |
422 | if (mount(NULL, "/", NULL, MS_REC|MS_SHARED, NULL) < 0) | |
423 | log_warning("Failed to set up the root directory for shared mount propagation: %m"); | |
b3ac5f8c | 424 | |
66e41181 LP |
425 | /* Create a few directories we always want around, Note that |
426 | * sd_booted() checks for /run/systemd/system, so this mkdir | |
427 | * really needs to stay for good, otherwise software that | |
428 | * copied sd-daemon.c into their sources will misdetect | |
429 | * systemd. */ | |
d2e54fae KS |
430 | mkdir_label("/run/systemd", 0755); |
431 | mkdir_label("/run/systemd/system", 0755); | |
c17ec25e | 432 | mkdir_label("/run/systemd/inaccessible", 0000); |
b925e726 | 433 | |
0c85a4f3 | 434 | return 0; |
8e274523 | 435 | } |