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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> | |
8e274523 | 24 | #include <stdlib.h> |
5c0532d1 | 25 | #include <unistd.h> |
1829dc9d | 26 | #include <ftw.h> |
8e274523 | 27 | |
b5efdb8a | 28 | #include "alloc-util.h" |
64824462 | 29 | #include "bus-util.h" |
4349cd7c LP |
30 | #include "cgroup-util.h" |
31 | #include "dev-setup.h" | |
32 | #include "efivars.h" | |
33 | #include "label.h" | |
8e274523 | 34 | #include "log.h" |
c9af1080 | 35 | #include "macro.h" |
4349cd7c | 36 | #include "missing.h" |
49e942b2 | 37 | #include "mkdir.h" |
4349cd7c LP |
38 | #include "mount-setup.h" |
39 | #include "mount-util.h" | |
9eb977db | 40 | #include "path-util.h" |
4349cd7c | 41 | #include "set.h" |
8552b176 | 42 | #include "smack-util.h" |
4349cd7c | 43 | #include "strv.h" |
ee104e11 | 44 | #include "user-util.h" |
4349cd7c LP |
45 | #include "util.h" |
46 | #include "virt.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[] = { |
68d4c452 LP |
75 | { "sysfs", "/sys", "sysfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
76 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
77 | { "proc", "/proc", "proc", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, | |
78 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
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 |
68d4c452 LP |
84 | { "smackfs", "/sys/fs/smackfs", "smackfs", "smackfsdef=*", MS_NOSUID|MS_NOEXEC|MS_NODEV, |
85 | mac_smack_use, MNT_FATAL }, | |
86 | { "tmpfs", "/dev/shm", "tmpfs", "mode=1777,smackfsroot=*", MS_NOSUID|MS_NODEV|MS_STRICTATIME, | |
87 | mac_smack_use, MNT_FATAL }, | |
d407c940 | 88 | #endif |
68d4c452 LP |
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 | 93 | #ifdef HAVE_SMACK |
68d4c452 LP |
94 | { "tmpfs", "/run", "tmpfs", "mode=755,smackfsroot=*", MS_NOSUID|MS_NODEV|MS_STRICTATIME, |
95 | mac_smack_use, MNT_FATAL }, | |
d407c940 | 96 | #endif |
68d4c452 LP |
97 | { "tmpfs", "/run", "tmpfs", "mode=755", MS_NOSUID|MS_NODEV|MS_STRICTATIME, |
98 | NULL, MNT_FATAL|MNT_IN_CONTAINER }, | |
efdb0237 LP |
99 | { "cgroup", "/sys/fs/cgroup", "cgroup", "__DEVEL__sane_behavior", MS_NOSUID|MS_NOEXEC|MS_NODEV, |
100 | cg_is_unified_wanted, MNT_FATAL|MNT_IN_CONTAINER }, | |
68d4c452 | 101 | { "tmpfs", "/sys/fs/cgroup", "tmpfs", "mode=755", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME, |
efdb0237 | 102 | cg_is_legacy_wanted, MNT_FATAL|MNT_IN_CONTAINER }, |
68d4c452 | 103 | { "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd,xattr", MS_NOSUID|MS_NOEXEC|MS_NODEV, |
efdb0237 | 104 | cg_is_legacy_wanted, MNT_IN_CONTAINER }, |
68d4c452 | 105 | { "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd", MS_NOSUID|MS_NOEXEC|MS_NODEV, |
efdb0237 | 106 | cg_is_legacy_wanted, MNT_FATAL|MNT_IN_CONTAINER }, |
68d4c452 LP |
107 | { "pstore", "/sys/fs/pstore", "pstore", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
108 | NULL, MNT_NONE }, | |
c06bf414 | 109 | #ifdef ENABLE_EFI |
68d4c452 LP |
110 | { "efivarfs", "/sys/firmware/efi/efivars", "efivarfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
111 | is_efi_boot, MNT_NONE }, | |
c06bf414 | 112 | #endif |
63cc4c31 | 113 | { "kdbusfs", "/sys/fs/kdbus", "kdbusfs", NULL, MS_NOSUID|MS_NOEXEC|MS_NODEV, |
1f49dffc | 114 | is_kdbus_wanted, MNT_IN_CONTAINER }, |
63cc4c31 DM |
115 | }; |
116 | ||
949c6510 | 117 | /* These are API file systems that might be mounted by other software, |
46ff0ed7 | 118 | * we just list them here so that we know that we should ignore them */ |
949c6510 | 119 | |
eaeb18db LP |
120 | static const char ignore_paths[] = |
121 | /* SELinux file systems */ | |
122 | "/sys/fs/selinux\0" | |
eaeb18db LP |
123 | /* Container bind mounts */ |
124 | "/proc/sys\0" | |
125 | "/dev/console\0" | |
c481f78b | 126 | "/proc/kmsg\0"; |
949c6510 | 127 | |
dad08730 LP |
128 | bool mount_point_is_api(const char *path) { |
129 | unsigned i; | |
130 | ||
131 | /* Checks if this mount point is considered "API", and hence | |
132 | * should be ignored */ | |
133 | ||
ca714c0e | 134 | for (i = 0; i < ELEMENTSOF(mount_table); i ++) |
449ddb2d | 135 | if (path_equal(path, mount_table[i].where)) |
dad08730 LP |
136 | return true; |
137 | ||
57f2a956 KS |
138 | return path_startswith(path, "/sys/fs/cgroup/"); |
139 | } | |
140 | ||
141 | bool mount_point_ignore(const char *path) { | |
eaeb18db | 142 | const char *i; |
57f2a956 | 143 | |
eaeb18db LP |
144 | NULSTR_FOREACH(i, ignore_paths) |
145 | if (path_equal(path, i)) | |
949c6510 LP |
146 | return true; |
147 | ||
57f2a956 | 148 | return false; |
dad08730 LP |
149 | } |
150 | ||
4ef31082 | 151 | static int mount_one(const MountPoint *p, bool relabel) { |
8e274523 LP |
152 | int r; |
153 | ||
ca714c0e | 154 | assert(p); |
8e274523 | 155 | |
6aa220e0 KS |
156 | if (p->condition_fn && !p->condition_fn()) |
157 | return 0; | |
158 | ||
51b4af2c | 159 | /* Relabel first, just in case */ |
4ef31082 | 160 | if (relabel) |
c9bc0764 | 161 | label_fix(p->where, true, true); |
51b4af2c | 162 | |
e26d6ce5 | 163 | r = path_is_mount_point(p->where, AT_SYMLINK_FOLLOW); |
64f75d7a | 164 | if (r < 0 && r != -ENOENT) |
8e274523 | 165 | return r; |
8e274523 | 166 | if (r > 0) |
51b4af2c | 167 | return 0; |
8e274523 | 168 | |
c481f78b | 169 | /* Skip securityfs in a container */ |
75f86906 | 170 | if (!(p->mode & MNT_IN_CONTAINER) && detect_container() > 0) |
c481f78b LP |
171 | return 0; |
172 | ||
a04f58d6 LP |
173 | /* The access mode here doesn't really matter too much, since |
174 | * the mounted file system will take precedence anyway. */ | |
c4bfd169 LP |
175 | if (relabel) |
176 | mkdir_p_label(p->where, 0755); | |
177 | else | |
178 | mkdir_p(p->where, 0755); | |
a04f58d6 | 179 | |
8e274523 | 180 | log_debug("Mounting %s to %s of type %s with options %s.", |
ca714c0e LP |
181 | p->what, |
182 | p->where, | |
183 | p->type, | |
184 | strna(p->options)); | |
185 | ||
186 | if (mount(p->what, | |
187 | p->where, | |
188 | p->type, | |
189 | p->flags, | |
190 | p->options) < 0) { | |
99a17ada | 191 | log_full((p->mode & MNT_FATAL) ? LOG_ERR : LOG_DEBUG, "Failed to mount %s at %s: %m", p->type, p->where); |
6aa220e0 | 192 | return (p->mode & MNT_FATAL) ? -errno : 0; |
8e274523 LP |
193 | } |
194 | ||
51b4af2c | 195 | /* Relabel again, since we now mounted something fresh here */ |
4ef31082 | 196 | if (relabel) |
c9bc0764 | 197 | label_fix(p->where, false, false); |
5275d3c1 | 198 | |
0c85a4f3 | 199 | return 1; |
8e274523 LP |
200 | } |
201 | ||
4ef31082 LP |
202 | int mount_setup_early(void) { |
203 | unsigned i; | |
204 | int r = 0; | |
205 | ||
206 | assert_cc(N_EARLY_MOUNT <= ELEMENTSOF(mount_table)); | |
207 | ||
208 | /* Do a minimal mount of /proc and friends to enable the most | |
209 | * basic stuff, such as SELinux */ | |
210 | for (i = 0; i < N_EARLY_MOUNT; i ++) { | |
211 | int j; | |
212 | ||
213 | j = mount_one(mount_table + i, false); | |
7ff307bc | 214 | if (j != 0 && r >= 0) |
4ef31082 LP |
215 | r = j; |
216 | } | |
217 | ||
218 | return r; | |
219 | } | |
220 | ||
0c85a4f3 | 221 | int mount_cgroup_controllers(char ***join_controllers) { |
a6b26d90 | 222 | _cleanup_set_free_free_ Set *controllers = NULL; |
a641dcd9 | 223 | int r; |
2076ca54 | 224 | |
efdb0237 LP |
225 | if (!cg_is_legacy_wanted()) |
226 | return 0; | |
227 | ||
670802d4 | 228 | /* Mount all available cgroup controllers that are built into the kernel. */ |
2076ca54 | 229 | |
d5099efc | 230 | controllers = set_new(&string_hash_ops); |
a6b26d90 ZJS |
231 | if (!controllers) |
232 | return log_oom(); | |
0c85a4f3 | 233 | |
b12afc8c LP |
234 | r = cg_kernel_controllers(controllers); |
235 | if (r < 0) | |
236 | return log_error_errno(r, "Failed to enumerate cgroup controllers: %m"); | |
0c85a4f3 LP |
237 | |
238 | for (;;) { | |
a641dcd9 | 239 | _cleanup_free_ char *options = NULL, *controller = NULL, *where = NULL; |
a6b26d90 ZJS |
240 | MountPoint p = { |
241 | .what = "cgroup", | |
242 | .type = "cgroup", | |
243 | .flags = MS_NOSUID|MS_NOEXEC|MS_NODEV, | |
244 | .mode = MNT_IN_CONTAINER, | |
245 | }; | |
0c85a4f3 LP |
246 | char ***k = NULL; |
247 | ||
248 | controller = set_steal_first(controllers); | |
249 | if (!controller) | |
250 | break; | |
251 | ||
252 | if (join_controllers) | |
253 | for (k = join_controllers; *k; k++) | |
254 | if (strv_find(*k, controller)) | |
255 | break; | |
256 | ||
257 | if (k && *k) { | |
258 | char **i, **j; | |
259 | ||
260 | for (i = *k, j = *k; *i; i++) { | |
261 | ||
262 | if (!streq(*i, controller)) { | |
a641dcd9 | 263 | _cleanup_free_ char *t; |
0c85a4f3 LP |
264 | |
265 | t = set_remove(controllers, *i); | |
266 | if (!t) { | |
267 | free(*i); | |
268 | continue; | |
269 | } | |
0c85a4f3 LP |
270 | } |
271 | ||
272 | *(j++) = *i; | |
273 | } | |
274 | ||
275 | *j = NULL; | |
276 | ||
277 | options = strv_join(*k, ","); | |
a6b26d90 ZJS |
278 | if (!options) |
279 | return log_oom(); | |
0c85a4f3 LP |
280 | } else { |
281 | options = controller; | |
282 | controller = NULL; | |
283 | } | |
284 | ||
a641dcd9 LP |
285 | where = strappend("/sys/fs/cgroup/", options); |
286 | if (!where) | |
287 | return log_oom(); | |
288 | ||
289 | p.where = where; | |
0c85a4f3 | 290 | p.options = options; |
2076ca54 | 291 | |
4ef31082 | 292 | r = mount_one(&p, true); |
a6b26d90 ZJS |
293 | if (r < 0) |
294 | return r; | |
0c85a4f3 LP |
295 | |
296 | if (r > 0 && k && *k) { | |
297 | char **i; | |
298 | ||
299 | for (i = *k; *i; i++) { | |
a641dcd9 LP |
300 | _cleanup_free_ char *t = NULL; |
301 | ||
302 | t = strappend("/sys/fs/cgroup/", *i); | |
303 | if (!t) | |
304 | return log_oom(); | |
0c85a4f3 LP |
305 | |
306 | r = symlink(options, t); | |
4a62c710 MS |
307 | if (r < 0 && errno != EEXIST) |
308 | return log_error_errno(errno, "Failed to create symlink %s: %m", t); | |
f8c1a81c SW |
309 | #ifdef SMACK_RUN_LABEL |
310 | r = mac_smack_copy(t, options); | |
311 | if (r < 0 && r != -EOPNOTSUPP) | |
312 | return log_error_errno(r, "Failed to copy smack label from %s to %s: %m", options, t); | |
313 | #endif | |
0c85a4f3 LP |
314 | } |
315 | } | |
2076ca54 LP |
316 | } |
317 | ||
679142ce LP |
318 | /* Now that we mounted everything, let's make the tmpfs the |
319 | * cgroup file systems are mounted into read-only. */ | |
b12afc8c | 320 | (void) mount("tmpfs", "/sys/fs/cgroup", "tmpfs", MS_REMOUNT|MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME|MS_RDONLY, "mode=755"); |
679142ce | 321 | |
a6b26d90 | 322 | return 0; |
2076ca54 LP |
323 | } |
324 | ||
0fff82e5 | 325 | #if defined(HAVE_SELINUX) || defined(HAVE_SMACK) |
1829dc9d LP |
326 | static int nftw_cb( |
327 | const char *fpath, | |
328 | const struct stat *sb, | |
329 | int tflag, | |
330 | struct FTW *ftwbuf) { | |
331 | ||
9fe117ea | 332 | /* No need to label /dev twice in a row... */ |
edb49778 LP |
333 | if (_unlikely_(ftwbuf->level == 0)) |
334 | return FTW_CONTINUE; | |
335 | ||
c9bc0764 | 336 | label_fix(fpath, false, false); |
af65c248 | 337 | |
edb49778 | 338 | /* /run/initramfs is static data and big, no need to |
af65c248 | 339 | * dynamically relabel its contents at boot... */ |
edb49778 LP |
340 | if (_unlikely_(ftwbuf->level == 1 && |
341 | tflag == FTW_D && | |
342 | streq(fpath, "/run/initramfs"))) | |
343 | return FTW_SKIP_SUBTREE; | |
9fe117ea | 344 | |
edb49778 | 345 | return FTW_CONTINUE; |
1829dc9d | 346 | }; |
0fff82e5 | 347 | #endif |
1829dc9d | 348 | |
0b3325e7 | 349 | int mount_setup(bool loaded_policy) { |
dad08730 | 350 | unsigned i; |
68d4c452 | 351 | int r = 0; |
8e274523 | 352 | |
4ef31082 | 353 | for (i = 0; i < ELEMENTSOF(mount_table); i ++) { |
68d4c452 | 354 | int j; |
4ef31082 | 355 | |
68d4c452 | 356 | j = mount_one(mount_table + i, loaded_policy); |
7ff307bc | 357 | if (j != 0 && r >= 0) |
68d4c452 | 358 | r = j; |
4ef31082 | 359 | } |
8e274523 | 360 | |
68d4c452 LP |
361 | if (r < 0) |
362 | return r; | |
363 | ||
0fff82e5 | 364 | #if defined(HAVE_SELINUX) || defined(HAVE_SMACK) |
f1d19aa4 LP |
365 | /* Nodes in devtmpfs and /run need to be manually updated for |
366 | * the appropriate labels, after mounting. The other virtual | |
367 | * API file systems like /sys and /proc do not need that, they | |
368 | * use the same label for all their files. */ | |
0b3325e7 LP |
369 | if (loaded_policy) { |
370 | usec_t before_relabel, after_relabel; | |
371 | char timespan[FORMAT_TIMESPAN_MAX]; | |
372 | ||
373 | before_relabel = now(CLOCK_MONOTONIC); | |
374 | ||
edb49778 LP |
375 | nftw("/dev", nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL); |
376 | nftw("/run", nftw_cb, 64, FTW_MOUNT|FTW_PHYS|FTW_ACTIONRETVAL); | |
0b3325e7 LP |
377 | |
378 | after_relabel = now(CLOCK_MONOTONIC); | |
379 | ||
380 | log_info("Relabelled /dev and /run in %s.", | |
2fa4092c | 381 | format_timespan(timespan, sizeof(timespan), after_relabel - before_relabel, 0)); |
3bbecb2f | 382 | } |
0fff82e5 | 383 | #endif |
1829dc9d | 384 | |
5c0532d1 | 385 | /* Create a few default symlinks, which are normally created |
f1d19aa4 | 386 | * by udevd, but some scripts might need them before we start |
5c0532d1 | 387 | * udevd. */ |
03cfe0d5 | 388 | dev_setup(NULL, UID_INVALID, GID_INVALID); |
5c0532d1 | 389 | |
b3ac5f8c LP |
390 | /* Mark the root directory as shared in regards to mount |
391 | * propagation. The kernel defaults to "private", but we think | |
392 | * it makes more sense to have a default of "shared" so that | |
393 | * nspawn and the container tools work out of the box. If | |
394 | * specific setups need other settings they can reset the | |
395 | * propagation mode to private if needed. */ | |
75f86906 | 396 | if (detect_container() <= 0) |
c481f78b | 397 | if (mount(NULL, "/", NULL, MS_REC|MS_SHARED, NULL) < 0) |
56f64d95 | 398 | log_warning_errno(errno, "Failed to set up the root directory for shared mount propagation: %m"); |
b3ac5f8c | 399 | |
66e41181 LP |
400 | /* Create a few directories we always want around, Note that |
401 | * sd_booted() checks for /run/systemd/system, so this mkdir | |
402 | * really needs to stay for good, otherwise software that | |
403 | * copied sd-daemon.c into their sources will misdetect | |
404 | * systemd. */ | |
d2e54fae KS |
405 | mkdir_label("/run/systemd", 0755); |
406 | mkdir_label("/run/systemd/system", 0755); | |
c17ec25e | 407 | mkdir_label("/run/systemd/inaccessible", 0000); |
b925e726 | 408 | |
0c85a4f3 | 409 | return 0; |
8e274523 | 410 | } |