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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" |
8e274523 | 45 | |
bef2733f LP |
46 | #ifndef TTY_GID |
47 | #define TTY_GID 5 | |
48 | #endif | |
49 | ||
6aa220e0 KS |
50 | typedef enum MountMode { |
51 | MNT_NONE = 0, | |
52 | MNT_FATAL = 1 << 0, | |
53 | MNT_IN_CONTAINER = 1 << 1, | |
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 RS |
67 | * fourth (securityfs) is needed by IMA to load a custom policy. The |
68 | * other ones we can delay until SELinux and IMA are loaded. */ | |
ffbd2c4d | 69 | #define N_EARLY_MOUNT 5 |
4ef31082 | 70 | |
ca714c0e | 71 | static const MountPoint mount_table[] = { |
6aa220e0 KS |
72 | { "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
73 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
74 | { "sysfs", "/sys", "sysfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, | |
75 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
76 | { "devtmpfs", "/dev", "devtmpfs", "mode=755", MS_NOSUID|MS_STRICTATIME, | |
77 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
78 | { "securityfs", "/sys/kernel/security", "securityfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, | |
79 | NULL, MNT_NONE }, | |
ffbd2c4d NC |
80 | { "smackfs", "/sys/fs/smackfs", "smackfs", "smackfsdef=*", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME, |
81 | NULL, MNT_NONE }, | |
d407c940 AK |
82 | #ifdef HAVE_SMACK |
83 | { "tmpfs", "/dev/shm", "tmpfs", "mode=1777,smackfsroot=*", MS_NOSUID|MS_NODEV|MS_STRICTATIME, | |
84 | NULL, MNT_IN_CONTAINER }, | |
85 | #endif | |
6aa220e0 KS |
86 | { "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV|MS_STRICTATIME, |
87 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
88 | { "devpts", "/dev/pts", "devpts", "mode=620,gid=" STRINGIFY(TTY_GID), MS_NOSUID|MS_NOEXEC, | |
89 | NULL, MNT_IN_CONTAINER }, | |
d407c940 AK |
90 | #ifdef HAVE_SMACK |
91 | { "tmpfs", "/run", "tmpfs", "mode=755,smackfsroot=*", MS_NOSUID|MS_NODEV|MS_STRICTATIME, | |
92 | NULL, MNT_IN_CONTAINER }, | |
93 | #endif | |
6aa220e0 KS |
94 | { "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME, |
95 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
96 | { "tmpfs", "/sys/fs/cgroup", "tmpfs", "mode=755", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME, | |
97 | NULL, MNT_IN_CONTAINER }, | |
0ee67958 ZJS |
98 | #ifdef HAVE_XATTR |
99 | { "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd,xattr", MS_NOSUID|MS_NOEXEC|MS_NODEV, | |
100 | NULL, MNT_IN_CONTAINER }, | |
101 | #endif | |
102 | { "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd", MS_NOSUID|MS_NOEXEC|MS_NODEV, | |
6aa220e0 | 103 | NULL, MNT_IN_CONTAINER }, |
c06bf414 KS |
104 | { "pstore", "/sys/fs/pstore", "pstore", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
105 | NULL, MNT_NONE }, | |
106 | #ifdef ENABLE_EFI | |
107 | { "efivarfs", "/sys/firmware/efi/efivars", "efivarfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, | |
108 | is_efi_boot, MNT_NONE }, | |
109 | #endif | |
8e274523 LP |
110 | }; |
111 | ||
949c6510 | 112 | /* These are API file systems that might be mounted by other software, |
46ff0ed7 | 113 | * we just list them here so that we know that we should ignore them */ |
949c6510 | 114 | |
eaeb18db LP |
115 | static const char ignore_paths[] = |
116 | /* SELinux file systems */ | |
117 | "/sys/fs/selinux\0" | |
118 | "/selinux\0" | |
119 | /* Legacy cgroup mount points */ | |
120 | "/dev/cgroup\0" | |
121 | "/cgroup\0" | |
122 | /* Legacy kernel file system */ | |
123 | "/proc/bus/usb\0" | |
124 | /* Container bind mounts */ | |
125 | "/proc/sys\0" | |
126 | "/dev/console\0" | |
c481f78b | 127 | "/proc/kmsg\0"; |
949c6510 | 128 | |
dad08730 LP |
129 | bool mount_point_is_api(const char *path) { |
130 | unsigned i; | |
131 | ||
132 | /* Checks if this mount point is considered "API", and hence | |
133 | * should be ignored */ | |
134 | ||
ca714c0e | 135 | for (i = 0; i < ELEMENTSOF(mount_table); i ++) |
449ddb2d | 136 | if (path_equal(path, mount_table[i].where)) |
dad08730 LP |
137 | return true; |
138 | ||
57f2a956 KS |
139 | return path_startswith(path, "/sys/fs/cgroup/"); |
140 | } | |
141 | ||
142 | bool mount_point_ignore(const char *path) { | |
eaeb18db | 143 | const char *i; |
57f2a956 | 144 | |
eaeb18db LP |
145 | NULSTR_FOREACH(i, ignore_paths) |
146 | if (path_equal(path, i)) | |
949c6510 LP |
147 | return true; |
148 | ||
57f2a956 | 149 | return false; |
dad08730 LP |
150 | } |
151 | ||
4ef31082 | 152 | static int mount_one(const MountPoint *p, bool relabel) { |
8e274523 LP |
153 | int r; |
154 | ||
ca714c0e | 155 | assert(p); |
8e274523 | 156 | |
6aa220e0 KS |
157 | if (p->condition_fn && !p->condition_fn()) |
158 | return 0; | |
159 | ||
51b4af2c | 160 | /* Relabel first, just in case */ |
4ef31082 | 161 | if (relabel) |
c9bc0764 | 162 | label_fix(p->where, true, true); |
51b4af2c | 163 | |
c481f78b LP |
164 | r = path_is_mount_point(p->where, true); |
165 | if (r < 0) | |
8e274523 LP |
166 | return r; |
167 | ||
168 | if (r > 0) | |
51b4af2c | 169 | return 0; |
8e274523 | 170 | |
c481f78b | 171 | /* Skip securityfs in a container */ |
6aa220e0 | 172 | if (!(p->mode & MNT_IN_CONTAINER) && detect_container(NULL) > 0) |
c481f78b LP |
173 | return 0; |
174 | ||
a04f58d6 LP |
175 | /* The access mode here doesn't really matter too much, since |
176 | * the mounted file system will take precedence anyway. */ | |
d2e54fae | 177 | mkdir_p_label(p->where, 0755); |
a04f58d6 | 178 | |
8e274523 | 179 | log_debug("Mounting %s to %s of type %s with options %s.", |
ca714c0e LP |
180 | p->what, |
181 | p->where, | |
182 | p->type, | |
183 | strna(p->options)); | |
184 | ||
185 | if (mount(p->what, | |
186 | p->where, | |
187 | p->type, | |
188 | p->flags, | |
189 | p->options) < 0) { | |
6aa220e0 KS |
190 | log_full((p->mode & MNT_FATAL) ? LOG_ERR : LOG_DEBUG, "Failed to mount %s: %s", p->where, strerror(errno)); |
191 | return (p->mode & MNT_FATAL) ? -errno : 0; | |
8e274523 LP |
192 | } |
193 | ||
51b4af2c | 194 | /* Relabel again, since we now mounted something fresh here */ |
4ef31082 | 195 | if (relabel) |
c9bc0764 | 196 | label_fix(p->where, false, false); |
5275d3c1 | 197 | |
0c85a4f3 | 198 | return 1; |
8e274523 LP |
199 | } |
200 | ||
4ef31082 LP |
201 | int mount_setup_early(void) { |
202 | unsigned i; | |
203 | int r = 0; | |
204 | ||
205 | assert_cc(N_EARLY_MOUNT <= ELEMENTSOF(mount_table)); | |
206 | ||
207 | /* Do a minimal mount of /proc and friends to enable the most | |
208 | * basic stuff, such as SELinux */ | |
209 | for (i = 0; i < N_EARLY_MOUNT; i ++) { | |
210 | int j; | |
211 | ||
212 | j = mount_one(mount_table + i, false); | |
213 | if (r == 0) | |
214 | r = j; | |
215 | } | |
216 | ||
217 | return r; | |
218 | } | |
219 | ||
0c85a4f3 | 220 | int mount_cgroup_controllers(char ***join_controllers) { |
2076ca54 | 221 | int r; |
20c03b7b | 222 | char buf[LINE_MAX]; |
a6b26d90 ZJS |
223 | _cleanup_set_free_free_ Set *controllers = NULL; |
224 | _cleanup_fclose_ FILE *f; | |
2076ca54 | 225 | |
670802d4 | 226 | /* Mount all available cgroup controllers that are built into the kernel. */ |
2076ca54 | 227 | |
0c85a4f3 LP |
228 | f = fopen("/proc/cgroups", "re"); |
229 | if (!f) { | |
016e9849 LP |
230 | log_error("Failed to enumerate cgroup controllers: %m"); |
231 | return 0; | |
232 | } | |
2076ca54 | 233 | |
0c85a4f3 | 234 | controllers = set_new(string_hash_func, string_compare_func); |
a6b26d90 ZJS |
235 | if (!controllers) |
236 | return log_oom(); | |
0c85a4f3 | 237 | |
2076ca54 | 238 | /* Ignore the header line */ |
bab45044 | 239 | (void) fgets(buf, sizeof(buf), f); |
2076ca54 LP |
240 | |
241 | for (;;) { | |
0c85a4f3 LP |
242 | char *controller; |
243 | int enabled = 0; | |
2076ca54 | 244 | |
16f6682d | 245 | if (fscanf(f, "%ms %*i %*i %i", &controller, &enabled) != 2) { |
2076ca54 LP |
246 | |
247 | if (feof(f)) | |
248 | break; | |
249 | ||
250 | log_error("Failed to parse /proc/cgroups."); | |
a6b26d90 | 251 | return -EIO; |
2076ca54 LP |
252 | } |
253 | ||
600a328f LP |
254 | if (!enabled) { |
255 | free(controller); | |
256 | continue; | |
257 | } | |
258 | ||
ef42202a | 259 | r = set_consume(controllers, controller); |
0c85a4f3 LP |
260 | if (r < 0) { |
261 | log_error("Failed to add controller to set."); | |
a6b26d90 | 262 | return r; |
0c85a4f3 LP |
263 | } |
264 | } | |
265 | ||
266 | for (;;) { | |
a6b26d90 ZJS |
267 | MountPoint p = { |
268 | .what = "cgroup", | |
269 | .type = "cgroup", | |
270 | .flags = MS_NOSUID|MS_NOEXEC|MS_NODEV, | |
271 | .mode = MNT_IN_CONTAINER, | |
272 | }; | |
0c85a4f3 | 273 | char ***k = NULL; |
a6b26d90 | 274 | _cleanup_free_ char *options = NULL, *controller; |
0c85a4f3 LP |
275 | |
276 | controller = set_steal_first(controllers); | |
277 | if (!controller) | |
278 | break; | |
279 | ||
280 | if (join_controllers) | |
281 | for (k = join_controllers; *k; k++) | |
282 | if (strv_find(*k, controller)) | |
283 | break; | |
284 | ||
285 | if (k && *k) { | |
286 | char **i, **j; | |
287 | ||
288 | for (i = *k, j = *k; *i; i++) { | |
289 | ||
290 | if (!streq(*i, controller)) { | |
a6b26d90 | 291 | char _cleanup_free_ *t; |
0c85a4f3 LP |
292 | |
293 | t = set_remove(controllers, *i); | |
294 | if (!t) { | |
295 | free(*i); | |
296 | continue; | |
297 | } | |
0c85a4f3 LP |
298 | } |
299 | ||
300 | *(j++) = *i; | |
301 | } | |
302 | ||
303 | *j = NULL; | |
304 | ||
305 | options = strv_join(*k, ","); | |
a6b26d90 ZJS |
306 | if (!options) |
307 | return log_oom(); | |
0c85a4f3 LP |
308 | } else { |
309 | options = controller; | |
310 | controller = NULL; | |
311 | } | |
312 | ||
a6b26d90 | 313 | p.where = strappenda("/sys/fs/cgroup/", options); |
0c85a4f3 | 314 | p.options = options; |
2076ca54 | 315 | |
4ef31082 | 316 | r = mount_one(&p, true); |
a6b26d90 ZJS |
317 | if (r < 0) |
318 | return r; | |
0c85a4f3 LP |
319 | |
320 | if (r > 0 && k && *k) { | |
321 | char **i; | |
322 | ||
323 | for (i = *k; *i; i++) { | |
a6b26d90 | 324 | char *t = strappenda("/sys/fs/cgroup/", *i); |
0c85a4f3 LP |
325 | |
326 | r = symlink(options, t); | |
0c85a4f3 | 327 | if (r < 0 && errno != EEXIST) { |
c79bb9e4 | 328 | log_error("Failed to create symlink %s: %m", t); |
a6b26d90 | 329 | return -errno; |
0c85a4f3 LP |
330 | } |
331 | } | |
332 | } | |
2076ca54 LP |
333 | } |
334 | ||
a6b26d90 | 335 | return 0; |
2076ca54 LP |
336 | } |
337 | ||
1829dc9d LP |
338 | static int nftw_cb( |
339 | const char *fpath, | |
340 | const struct stat *sb, | |
341 | int tflag, | |
342 | struct FTW *ftwbuf) { | |
343 | ||
9fe117ea | 344 | /* No need to label /dev twice in a row... */ |
edb49778 LP |
345 | if (_unlikely_(ftwbuf->level == 0)) |
346 | return FTW_CONTINUE; | |
347 | ||
c9bc0764 | 348 | label_fix(fpath, false, false); |
af65c248 | 349 | |
edb49778 | 350 | /* /run/initramfs is static data and big, no need to |
af65c248 | 351 | * dynamically relabel its contents at boot... */ |
edb49778 LP |
352 | if (_unlikely_(ftwbuf->level == 1 && |
353 | tflag == FTW_D && | |
354 | streq(fpath, "/run/initramfs"))) | |
355 | return FTW_SKIP_SUBTREE; | |
9fe117ea | 356 | |
edb49778 | 357 | return FTW_CONTINUE; |
1829dc9d LP |
358 | }; |
359 | ||
0b3325e7 | 360 | int mount_setup(bool loaded_policy) { |
8e274523 | 361 | int r; |
dad08730 | 362 | unsigned i; |
8e274523 | 363 | |
4ef31082 LP |
364 | for (i = 0; i < ELEMENTSOF(mount_table); i ++) { |
365 | r = mount_one(mount_table + i, true); | |
366 | ||
367 | if (r < 0) | |
8e274523 | 368 | return r; |
4ef31082 | 369 | } |
8e274523 | 370 | |
f1d19aa4 LP |
371 | /* Nodes in devtmpfs and /run need to be manually updated for |
372 | * the appropriate labels, after mounting. The other virtual | |
373 | * API file systems like /sys and /proc do not need that, they | |
374 | * use the same label for all their files. */ | |
0b3325e7 LP |
375 | if (loaded_policy) { |
376 | usec_t before_relabel, after_relabel; | |
377 | char timespan[FORMAT_TIMESPAN_MAX]; | |
378 | ||
379 | before_relabel = now(CLOCK_MONOTONIC); | |
380 | ||
edb49778 LP |
381 | nftw("/dev", nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL); |
382 | nftw("/run", nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL); | |
0b3325e7 LP |
383 | |
384 | after_relabel = now(CLOCK_MONOTONIC); | |
385 | ||
386 | log_info("Relabelled /dev and /run in %s.", | |
2fa4092c | 387 | format_timespan(timespan, sizeof(timespan), after_relabel - before_relabel, 0)); |
3bbecb2f | 388 | } |
1829dc9d | 389 | |
5c0532d1 | 390 | /* Create a few default symlinks, which are normally created |
f1d19aa4 | 391 | * by udevd, but some scripts might need them before we start |
5c0532d1 | 392 | * udevd. */ |
01ed0e23 | 393 | dev_setup(NULL); |
5c0532d1 | 394 | |
b3ac5f8c LP |
395 | /* Mark the root directory as shared in regards to mount |
396 | * propagation. The kernel defaults to "private", but we think | |
397 | * it makes more sense to have a default of "shared" so that | |
398 | * nspawn and the container tools work out of the box. If | |
399 | * specific setups need other settings they can reset the | |
400 | * propagation mode to private if needed. */ | |
c481f78b LP |
401 | if (detect_container(NULL) <= 0) |
402 | if (mount(NULL, "/", NULL, MS_REC|MS_SHARED, NULL) < 0) | |
403 | log_warning("Failed to set up the root directory for shared mount propagation: %m"); | |
b3ac5f8c | 404 | |
66e41181 LP |
405 | /* Create a few directories we always want around, Note that |
406 | * sd_booted() checks for /run/systemd/system, so this mkdir | |
407 | * really needs to stay for good, otherwise software that | |
408 | * copied sd-daemon.c into their sources will misdetect | |
409 | * systemd. */ | |
d2e54fae KS |
410 | mkdir_label("/run/systemd", 0755); |
411 | mkdir_label("/run/systemd/system", 0755); | |
c17ec25e | 412 | mkdir_label("/run/systemd/inaccessible", 0000); |
b925e726 | 413 | |
0c85a4f3 | 414 | return 0; |
8e274523 | 415 | } |