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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
15ae422b LP |
2 | /*** |
3 | This file is part of systemd. | |
4 | ||
5 | Copyright 2010 Lennart Poettering | |
6 | ||
7 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
8 | under the terms of the GNU Lesser General Public License as published by |
9 | the Free Software Foundation; either version 2.1 of the License, or | |
15ae422b LP |
10 | (at your option) any later version. |
11 | ||
12 | systemd is distributed in the hope that it will be useful, but | |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 15 | Lesser General Public License for more details. |
15ae422b | 16 | |
5430f7f2 | 17 | You should have received a copy of the GNU Lesser General Public License |
15ae422b LP |
18 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
19 | ***/ | |
20 | ||
21 | #include <errno.h> | |
07630cea | 22 | #include <sched.h> |
15ae422b | 23 | #include <stdio.h> |
07630cea LP |
24 | #include <string.h> |
25 | #include <sys/mount.h> | |
15ae422b | 26 | #include <sys/stat.h> |
07630cea | 27 | #include <unistd.h> |
25e870b5 | 28 | #include <linux/fs.h> |
15ae422b | 29 | |
b5efdb8a | 30 | #include "alloc-util.h" |
10404d52 | 31 | #include "base-filesystem.h" |
7f112f50 | 32 | #include "dev-setup.h" |
3ffd4af2 | 33 | #include "fd-util.h" |
d944dc95 | 34 | #include "fs-util.h" |
e908468b | 35 | #include "label.h" |
915e6d16 | 36 | #include "loop-util.h" |
07630cea LP |
37 | #include "loopback-setup.h" |
38 | #include "missing.h" | |
39 | #include "mkdir.h" | |
4349cd7c | 40 | #include "mount-util.h" |
3ffd4af2 | 41 | #include "namespace.h" |
07630cea | 42 | #include "path-util.h" |
d7b8eec7 | 43 | #include "selinux-util.h" |
2583fbea | 44 | #include "socket-util.h" |
36ce7110 | 45 | #include "stat-util.h" |
8b43440b | 46 | #include "string-table.h" |
07630cea LP |
47 | #include "string-util.h" |
48 | #include "strv.h" | |
affb60b1 | 49 | #include "umask-util.h" |
ee104e11 | 50 | #include "user-util.h" |
07630cea | 51 | #include "util.h" |
15ae422b | 52 | |
737ba3c8 | 53 | #define DEV_MOUNT_OPTIONS (MS_NOSUID|MS_STRICTATIME|MS_NOEXEC) |
54 | ||
c17ec25e | 55 | typedef enum MountMode { |
15ae422b LP |
56 | /* This is ordered by priority! */ |
57 | INACCESSIBLE, | |
d2d6c096 LP |
58 | BIND_MOUNT, |
59 | BIND_MOUNT_RECURSIVE, | |
ac0930c8 | 60 | PRIVATE_TMP, |
7f112f50 | 61 | PRIVATE_DEV, |
5d997827 | 62 | BIND_DEV, |
6c47cd7d | 63 | EMPTY_DIR, |
5d997827 LP |
64 | SYSFS, |
65 | PROCFS, | |
66 | READONLY, | |
59eeb84b | 67 | READWRITE, |
c17ec25e | 68 | } MountMode; |
15ae422b | 69 | |
34de407a | 70 | typedef struct MountEntry { |
5327c910 | 71 | const char *path_const; /* Memory allocated on stack or static */ |
cfbeb4ef | 72 | MountMode mode:5; |
5327c910 LP |
73 | bool ignore:1; /* Ignore if path does not exist? */ |
74 | bool has_prefix:1; /* Already is prefixed by the root dir? */ | |
cfbeb4ef | 75 | bool read_only:1; /* Shall this mount point be read-only? */ |
55fe7432 | 76 | char *path_malloc; /* Use this instead of 'path_const' if we had to allocate memory */ |
d2d6c096 LP |
77 | const char *source_const; /* The source path, for bind mounts */ |
78 | char *source_malloc; | |
34de407a | 79 | } MountEntry; |
15ae422b | 80 | |
5d997827 LP |
81 | /* If MountAPIVFS= is used, let's mount /sys and /proc into the it, but only as a fallback if the user hasn't mounted |
82 | * something there already. These mounts are hence overriden by any other explicitly configured mounts. */ | |
83 | static const MountEntry apivfs_table[] = { | |
84 | { "/proc", PROCFS, false }, | |
85 | { "/dev", BIND_DEV, false }, | |
86 | { "/sys", SYSFS, false }, | |
87 | }; | |
f471b2af | 88 | |
11a30cec | 89 | /* ProtectKernelTunables= option and the related filesystem APIs */ |
34de407a | 90 | static const MountEntry protect_kernel_tunables_table[] = { |
c6232fb0 LP |
91 | { "/proc/sys", READONLY, false }, |
92 | { "/proc/sysrq-trigger", READONLY, true }, | |
93 | { "/proc/latency_stats", READONLY, true }, | |
94 | { "/proc/mtrr", READONLY, true }, | |
aa70f38b | 95 | { "/proc/apm", READONLY, true }, /* Obsolete API, there's no point in permitting access to this, ever */ |
c6232fb0 LP |
96 | { "/proc/acpi", READONLY, true }, |
97 | { "/proc/timer_stats", READONLY, true }, | |
98 | { "/proc/asound", READONLY, true }, | |
99 | { "/proc/bus", READONLY, true }, | |
100 | { "/proc/fs", READONLY, true }, | |
101 | { "/proc/irq", READONLY, true }, | |
102 | { "/sys", READONLY, false }, | |
103 | { "/sys/kernel/debug", READONLY, true }, | |
104 | { "/sys/kernel/tracing", READONLY, true }, | |
105 | { "/sys/fs/cgroup", READWRITE, false }, /* READONLY is set by ProtectControlGroups= option */ | |
3a0bf6d6 | 106 | { "/sys/fs/selinux", READWRITE, true }, |
11a30cec DH |
107 | }; |
108 | ||
c575770b | 109 | /* ProtectKernelModules= option */ |
34de407a | 110 | static const MountEntry protect_kernel_modules_table[] = { |
349cc4a5 | 111 | #if HAVE_SPLIT_USR |
c6232fb0 | 112 | { "/lib/modules", INACCESSIBLE, true }, |
c575770b | 113 | #endif |
c6232fb0 | 114 | { "/usr/lib/modules", INACCESSIBLE, true }, |
c575770b DH |
115 | }; |
116 | ||
b6c432ca DH |
117 | /* |
118 | * ProtectHome=read-only table, protect $HOME and $XDG_RUNTIME_DIR and rest of | |
119 | * system should be protected by ProtectSystem= | |
120 | */ | |
34de407a | 121 | static const MountEntry protect_home_read_only_table[] = { |
c6232fb0 LP |
122 | { "/home", READONLY, true }, |
123 | { "/run/user", READONLY, true }, | |
124 | { "/root", READONLY, true }, | |
b6c432ca DH |
125 | }; |
126 | ||
127 | /* ProtectHome=yes table */ | |
34de407a | 128 | static const MountEntry protect_home_yes_table[] = { |
c6232fb0 LP |
129 | { "/home", INACCESSIBLE, true }, |
130 | { "/run/user", INACCESSIBLE, true }, | |
131 | { "/root", INACCESSIBLE, true }, | |
b6c432ca DH |
132 | }; |
133 | ||
f471b2af | 134 | /* ProtectSystem=yes table */ |
34de407a | 135 | static const MountEntry protect_system_yes_table[] = { |
c6232fb0 LP |
136 | { "/usr", READONLY, false }, |
137 | { "/boot", READONLY, true }, | |
138 | { "/efi", READONLY, true }, | |
f471b2af DH |
139 | }; |
140 | ||
141 | /* ProtectSystem=full includes ProtectSystem=yes */ | |
34de407a | 142 | static const MountEntry protect_system_full_table[] = { |
c6232fb0 LP |
143 | { "/usr", READONLY, false }, |
144 | { "/boot", READONLY, true }, | |
145 | { "/efi", READONLY, true }, | |
146 | { "/etc", READONLY, false }, | |
f471b2af DH |
147 | }; |
148 | ||
149 | /* | |
150 | * ProtectSystem=strict table. In this strict mode, we mount everything | |
151 | * read-only, except for /proc, /dev, /sys which are the kernel API VFS, | |
152 | * which are left writable, but PrivateDevices= + ProtectKernelTunables= | |
153 | * protect those, and these options should be fully orthogonal. | |
154 | * (And of course /home and friends are also left writable, as ProtectHome= | |
155 | * shall manage those, orthogonally). | |
156 | */ | |
34de407a | 157 | static const MountEntry protect_system_strict_table[] = { |
ddbe0412 LP |
158 | { "/", READONLY, false }, |
159 | { "/proc", READWRITE, false }, /* ProtectKernelTunables= */ | |
160 | { "/sys", READWRITE, false }, /* ProtectKernelTunables= */ | |
161 | { "/dev", READWRITE, false }, /* PrivateDevices= */ | |
162 | { "/home", READWRITE, true }, /* ProtectHome= */ | |
163 | { "/run/user", READWRITE, true }, /* ProtectHome= */ | |
164 | { "/root", READWRITE, true }, /* ProtectHome= */ | |
f471b2af DH |
165 | }; |
166 | ||
34de407a | 167 | static const char *mount_entry_path(const MountEntry *p) { |
f0a4feb0 DH |
168 | assert(p); |
169 | ||
5327c910 LP |
170 | /* Returns the path of this bind mount. If the malloc()-allocated ->path_buffer field is set we return that, |
171 | * otherwise the stack/static ->path field is returned. */ | |
f0a4feb0 | 172 | |
5327c910 | 173 | return p->path_malloc ?: p->path_const; |
f0a4feb0 DH |
174 | } |
175 | ||
34de407a | 176 | static bool mount_entry_read_only(const MountEntry *p) { |
cfbeb4ef LP |
177 | assert(p); |
178 | ||
179 | return p->read_only || IN_SET(p->mode, READONLY, INACCESSIBLE); | |
180 | } | |
181 | ||
d2d6c096 LP |
182 | static const char *mount_entry_source(const MountEntry *p) { |
183 | assert(p); | |
184 | ||
185 | return p->source_malloc ?: p->source_const; | |
186 | } | |
187 | ||
1eb7e08e LP |
188 | static void mount_entry_done(MountEntry *p) { |
189 | assert(p); | |
190 | ||
191 | p->path_malloc = mfree(p->path_malloc); | |
192 | p->source_malloc = mfree(p->source_malloc); | |
193 | } | |
194 | ||
d18aff04 | 195 | static int append_access_mounts(MountEntry **p, char **strv, MountMode mode, bool forcibly_require_prefix) { |
15ae422b LP |
196 | char **i; |
197 | ||
613b411c LP |
198 | assert(p); |
199 | ||
5327c910 LP |
200 | /* Adds a list of user-supplied READWRITE/READONLY/INACCESSIBLE entries */ |
201 | ||
15ae422b | 202 | STRV_FOREACH(i, strv) { |
5327c910 LP |
203 | bool ignore = false, needs_prefix = false; |
204 | const char *e = *i; | |
15ae422b | 205 | |
5327c910 LP |
206 | /* Look for any prefixes */ |
207 | if (startswith(e, "-")) { | |
208 | e++; | |
9c94d52e | 209 | ignore = true; |
ea92ae33 | 210 | } |
5327c910 LP |
211 | if (startswith(e, "+")) { |
212 | e++; | |
213 | needs_prefix = true; | |
214 | } | |
ea92ae33 | 215 | |
5327c910 | 216 | if (!path_is_absolute(e)) |
15ae422b LP |
217 | return -EINVAL; |
218 | ||
34de407a | 219 | *((*p)++) = (MountEntry) { |
5327c910 LP |
220 | .path_const = e, |
221 | .mode = mode, | |
222 | .ignore = ignore, | |
d18aff04 | 223 | .has_prefix = !needs_prefix && !forcibly_require_prefix, |
5327c910 | 224 | }; |
15ae422b LP |
225 | } |
226 | ||
227 | return 0; | |
228 | } | |
229 | ||
6c47cd7d LP |
230 | static int append_empty_dir_mounts(MountEntry **p, char **strv) { |
231 | char **i; | |
232 | ||
233 | assert(p); | |
234 | ||
235 | /* Adds tmpfs mounts to provide readable but empty directories. This is primarily used to implement the | |
236 | * "/private/" boundary directories for DynamicUser=1. */ | |
237 | ||
238 | STRV_FOREACH(i, strv) { | |
239 | ||
240 | *((*p)++) = (MountEntry) { | |
241 | .path_const = *i, | |
242 | .mode = EMPTY_DIR, | |
243 | .ignore = false, | |
244 | .has_prefix = false, | |
245 | .read_only = true, | |
246 | }; | |
247 | } | |
248 | ||
249 | return 0; | |
250 | } | |
251 | ||
d2d6c096 LP |
252 | static int append_bind_mounts(MountEntry **p, const BindMount *binds, unsigned n) { |
253 | unsigned i; | |
254 | ||
255 | assert(p); | |
256 | ||
257 | for (i = 0; i < n; i++) { | |
258 | const BindMount *b = binds + i; | |
259 | ||
260 | *((*p)++) = (MountEntry) { | |
261 | .path_const = b->destination, | |
262 | .mode = b->recursive ? BIND_MOUNT_RECURSIVE : BIND_MOUNT, | |
263 | .read_only = b->read_only, | |
264 | .source_const = b->source, | |
265 | }; | |
266 | } | |
267 | ||
268 | return 0; | |
269 | } | |
270 | ||
34de407a | 271 | static int append_static_mounts(MountEntry **p, const MountEntry *mounts, unsigned n, bool ignore_protect) { |
f471b2af | 272 | unsigned i; |
11a30cec DH |
273 | |
274 | assert(p); | |
f471b2af | 275 | assert(mounts); |
11a30cec | 276 | |
5327c910 | 277 | /* Adds a list of static pre-defined entries */ |
f471b2af | 278 | |
5327c910 | 279 | for (i = 0; i < n; i++) |
34de407a LP |
280 | *((*p)++) = (MountEntry) { |
281 | .path_const = mount_entry_path(mounts+i), | |
5327c910 LP |
282 | .mode = mounts[i].mode, |
283 | .ignore = mounts[i].ignore || ignore_protect, | |
284 | }; | |
f471b2af DH |
285 | |
286 | return 0; | |
287 | } | |
288 | ||
34de407a | 289 | static int append_protect_home(MountEntry **p, ProtectHome protect_home, bool ignore_protect) { |
c575770b DH |
290 | assert(p); |
291 | ||
5327c910 | 292 | switch (protect_home) { |
b6c432ca | 293 | |
5327c910 | 294 | case PROTECT_HOME_NO: |
b6c432ca DH |
295 | return 0; |
296 | ||
b6c432ca | 297 | case PROTECT_HOME_READ_ONLY: |
5327c910 LP |
298 | return append_static_mounts(p, protect_home_read_only_table, ELEMENTSOF(protect_home_read_only_table), ignore_protect); |
299 | ||
b6c432ca | 300 | case PROTECT_HOME_YES: |
5327c910 LP |
301 | return append_static_mounts(p, protect_home_yes_table, ELEMENTSOF(protect_home_yes_table), ignore_protect); |
302 | ||
b6c432ca | 303 | default: |
5327c910 | 304 | assert_not_reached("Unexpected ProtectHome= value"); |
b6c432ca | 305 | } |
b6c432ca DH |
306 | } |
307 | ||
34de407a | 308 | static int append_protect_system(MountEntry **p, ProtectSystem protect_system, bool ignore_protect) { |
f471b2af DH |
309 | assert(p); |
310 | ||
5327c910 LP |
311 | switch (protect_system) { |
312 | ||
313 | case PROTECT_SYSTEM_NO: | |
f471b2af DH |
314 | return 0; |
315 | ||
f471b2af | 316 | case PROTECT_SYSTEM_STRICT: |
5327c910 LP |
317 | return append_static_mounts(p, protect_system_strict_table, ELEMENTSOF(protect_system_strict_table), ignore_protect); |
318 | ||
f471b2af | 319 | case PROTECT_SYSTEM_YES: |
5327c910 LP |
320 | return append_static_mounts(p, protect_system_yes_table, ELEMENTSOF(protect_system_yes_table), ignore_protect); |
321 | ||
f471b2af | 322 | case PROTECT_SYSTEM_FULL: |
5327c910 LP |
323 | return append_static_mounts(p, protect_system_full_table, ELEMENTSOF(protect_system_full_table), ignore_protect); |
324 | ||
f471b2af | 325 | default: |
5327c910 | 326 | assert_not_reached("Unexpected ProtectSystem= value"); |
f471b2af | 327 | } |
11a30cec DH |
328 | } |
329 | ||
c17ec25e | 330 | static int mount_path_compare(const void *a, const void *b) { |
34de407a | 331 | const MountEntry *p = a, *q = b; |
a0827e2b | 332 | int d; |
15ae422b | 333 | |
6ee1a919 | 334 | /* If the paths are not equal, then order prefixes first */ |
34de407a | 335 | d = path_compare(mount_entry_path(p), mount_entry_path(q)); |
6ee1a919 LP |
336 | if (d != 0) |
337 | return d; | |
15ae422b | 338 | |
6ee1a919 LP |
339 | /* If the paths are equal, check the mode */ |
340 | if (p->mode < q->mode) | |
341 | return -1; | |
15ae422b | 342 | |
6ee1a919 LP |
343 | if (p->mode > q->mode) |
344 | return 1; | |
15ae422b | 345 | |
6ee1a919 | 346 | return 0; |
15ae422b LP |
347 | } |
348 | ||
34de407a | 349 | static int prefix_where_needed(MountEntry *m, unsigned n, const char *root_directory) { |
5327c910 LP |
350 | unsigned i; |
351 | ||
352 | /* Prefixes all paths in the bind mount table with the root directory if it is specified and the entry needs | |
353 | * that. */ | |
354 | ||
355 | if (!root_directory) | |
356 | return 0; | |
357 | ||
358 | for (i = 0; i < n; i++) { | |
359 | char *s; | |
360 | ||
361 | if (m[i].has_prefix) | |
362 | continue; | |
363 | ||
34de407a | 364 | s = prefix_root(root_directory, mount_entry_path(m+i)); |
5327c910 LP |
365 | if (!s) |
366 | return -ENOMEM; | |
367 | ||
e282f51f | 368 | free_and_replace(m[i].path_malloc, s); |
5327c910 LP |
369 | m[i].has_prefix = true; |
370 | } | |
371 | ||
372 | return 0; | |
373 | } | |
374 | ||
34de407a LP |
375 | static void drop_duplicates(MountEntry *m, unsigned *n) { |
376 | MountEntry *f, *t, *previous; | |
15ae422b | 377 | |
c17ec25e | 378 | assert(m); |
15ae422b | 379 | assert(n); |
15ae422b | 380 | |
fe3c2583 LP |
381 | /* Drops duplicate entries. Expects that the array is properly ordered already. */ |
382 | ||
1d54cd5d | 383 | for (f = m, t = m, previous = NULL; f < m + *n; f++) { |
15ae422b | 384 | |
fe3c2583 LP |
385 | /* The first one wins (which is the one with the more restrictive mode), see mount_path_compare() |
386 | * above. */ | |
34de407a LP |
387 | if (previous && path_equal(mount_entry_path(f), mount_entry_path(previous))) { |
388 | log_debug("%s is duplicate.", mount_entry_path(f)); | |
389 | previous->read_only = previous->read_only || mount_entry_read_only(f); /* Propagate the read-only flag to the remaining entry */ | |
1eb7e08e | 390 | mount_entry_done(f); |
15ae422b | 391 | continue; |
fe3c2583 | 392 | } |
15ae422b | 393 | |
e2d7c1a0 | 394 | *t = *f; |
15ae422b | 395 | previous = t; |
fe3c2583 LP |
396 | t++; |
397 | } | |
398 | ||
399 | *n = t - m; | |
400 | } | |
401 | ||
34de407a LP |
402 | static void drop_inaccessible(MountEntry *m, unsigned *n) { |
403 | MountEntry *f, *t; | |
fe3c2583 LP |
404 | const char *clear = NULL; |
405 | ||
406 | assert(m); | |
407 | assert(n); | |
408 | ||
409 | /* Drops all entries obstructed by another entry further up the tree. Expects that the array is properly | |
410 | * ordered already. */ | |
411 | ||
1d54cd5d | 412 | for (f = m, t = m; f < m + *n; f++) { |
fe3c2583 LP |
413 | |
414 | /* If we found a path set for INACCESSIBLE earlier, and this entry has it as prefix we should drop | |
415 | * it, as inaccessible paths really should drop the entire subtree. */ | |
34de407a LP |
416 | if (clear && path_startswith(mount_entry_path(f), clear)) { |
417 | log_debug("%s is masked by %s.", mount_entry_path(f), clear); | |
1eb7e08e | 418 | mount_entry_done(f); |
fe3c2583 LP |
419 | continue; |
420 | } | |
15ae422b | 421 | |
34de407a | 422 | clear = f->mode == INACCESSIBLE ? mount_entry_path(f) : NULL; |
fe3c2583 LP |
423 | |
424 | *t = *f; | |
15ae422b LP |
425 | t++; |
426 | } | |
427 | ||
c17ec25e | 428 | *n = t - m; |
15ae422b LP |
429 | } |
430 | ||
34de407a LP |
431 | static void drop_nop(MountEntry *m, unsigned *n) { |
432 | MountEntry *f, *t; | |
7648a565 LP |
433 | |
434 | assert(m); | |
435 | assert(n); | |
436 | ||
437 | /* Drops all entries which have an immediate parent that has the same type, as they are redundant. Assumes the | |
438 | * list is ordered by prefixes. */ | |
439 | ||
1d54cd5d | 440 | for (f = m, t = m; f < m + *n; f++) { |
7648a565 LP |
441 | |
442 | /* Only suppress such subtrees for READONLY and READWRITE entries */ | |
443 | if (IN_SET(f->mode, READONLY, READWRITE)) { | |
34de407a | 444 | MountEntry *p; |
7648a565 LP |
445 | bool found = false; |
446 | ||
447 | /* Now let's find the first parent of the entry we are looking at. */ | |
448 | for (p = t-1; p >= m; p--) { | |
34de407a | 449 | if (path_startswith(mount_entry_path(f), mount_entry_path(p))) { |
7648a565 LP |
450 | found = true; |
451 | break; | |
452 | } | |
453 | } | |
454 | ||
455 | /* We found it, let's see if it's the same mode, if so, we can drop this entry */ | |
456 | if (found && p->mode == f->mode) { | |
34de407a | 457 | log_debug("%s is redundant by %s", mount_entry_path(f), mount_entry_path(p)); |
1eb7e08e | 458 | mount_entry_done(f); |
7648a565 LP |
459 | continue; |
460 | } | |
461 | } | |
462 | ||
463 | *t = *f; | |
464 | t++; | |
465 | } | |
466 | ||
467 | *n = t - m; | |
468 | } | |
469 | ||
34de407a LP |
470 | static void drop_outside_root(const char *root_directory, MountEntry *m, unsigned *n) { |
471 | MountEntry *f, *t; | |
cd2902c9 LP |
472 | |
473 | assert(m); | |
474 | assert(n); | |
475 | ||
1d54cd5d | 476 | /* Nothing to do */ |
cd2902c9 LP |
477 | if (!root_directory) |
478 | return; | |
479 | ||
480 | /* Drops all mounts that are outside of the root directory. */ | |
481 | ||
1d54cd5d | 482 | for (f = m, t = m; f < m + *n; f++) { |
cd2902c9 | 483 | |
34de407a LP |
484 | if (!path_startswith(mount_entry_path(f), root_directory)) { |
485 | log_debug("%s is outside of root directory.", mount_entry_path(f)); | |
1eb7e08e | 486 | mount_entry_done(f); |
cd2902c9 LP |
487 | continue; |
488 | } | |
489 | ||
490 | *t = *f; | |
491 | t++; | |
492 | } | |
493 | ||
494 | *n = t - m; | |
495 | } | |
496 | ||
414b304b | 497 | static int clone_device_node(const char *d, const char *temporary_mount) { |
6f7f3a33 | 498 | const char *dn; |
b5e99f23 ДГ |
499 | struct stat st; |
500 | int r; | |
501 | ||
414b304b | 502 | if (stat(d, &st) < 0) { |
b5e99f23 ДГ |
503 | if (errno == ENOENT) |
504 | return 0; | |
505 | return -errno; | |
506 | } | |
507 | ||
508 | if (!S_ISBLK(st.st_mode) && | |
509 | !S_ISCHR(st.st_mode)) | |
510 | return -EINVAL; | |
511 | ||
512 | if (st.st_rdev == 0) | |
513 | return 0; | |
514 | ||
6f7f3a33 | 515 | dn = strjoina(temporary_mount, d); |
b5e99f23 ДГ |
516 | |
517 | mac_selinux_create_file_prepare(d, st.st_mode); | |
518 | r = mknod(dn, st.st_mode, st.st_rdev); | |
519 | mac_selinux_create_file_clear(); | |
b5e99f23 | 520 | if (r < 0) |
225874dc | 521 | return log_debug_errno(errno, "mknod failed for %s: %m", d); |
b5e99f23 | 522 | |
98b1d2b8 | 523 | return 1; |
b5e99f23 ДГ |
524 | } |
525 | ||
5d997827 | 526 | static int mount_private_dev(MountEntry *m) { |
7f112f50 LP |
527 | static const char devnodes[] = |
528 | "/dev/null\0" | |
529 | "/dev/zero\0" | |
530 | "/dev/full\0" | |
531 | "/dev/random\0" | |
532 | "/dev/urandom\0" | |
533 | "/dev/tty\0"; | |
534 | ||
2b85f4e1 | 535 | char temporary_mount[] = "/tmp/namespace-dev-XXXXXX"; |
63cc4c31 | 536 | const char *d, *dev = NULL, *devpts = NULL, *devshm = NULL, *devhugepages = NULL, *devmqueue = NULL, *devlog = NULL, *devptmx = NULL; |
7f112f50 LP |
537 | _cleanup_umask_ mode_t u; |
538 | int r; | |
539 | ||
540 | assert(m); | |
541 | ||
542 | u = umask(0000); | |
543 | ||
2b85f4e1 LP |
544 | if (!mkdtemp(temporary_mount)) |
545 | return -errno; | |
546 | ||
63c372cb | 547 | dev = strjoina(temporary_mount, "/dev"); |
dc751688 | 548 | (void) mkdir(dev, 0755); |
737ba3c8 | 549 | if (mount("tmpfs", dev, "tmpfs", DEV_MOUNT_OPTIONS, "mode=755") < 0) { |
2b85f4e1 LP |
550 | r = -errno; |
551 | goto fail; | |
552 | } | |
553 | ||
63c372cb | 554 | devpts = strjoina(temporary_mount, "/dev/pts"); |
dc751688 | 555 | (void) mkdir(devpts, 0755); |
2b85f4e1 LP |
556 | if (mount("/dev/pts", devpts, NULL, MS_BIND, NULL) < 0) { |
557 | r = -errno; | |
558 | goto fail; | |
559 | } | |
560 | ||
414b304b ДГ |
561 | /* /dev/ptmx can either be a device node or a symlink to /dev/pts/ptmx |
562 | * when /dev/ptmx a device node, /dev/pts/ptmx has 000 permissions making it inaccessible | |
563 | * thus, in that case make a clone | |
564 | * | |
565 | * in nspawn and other containers it will be a symlink, in that case make it a symlink | |
566 | */ | |
36ce7110 LP |
567 | r = is_symlink("/dev/ptmx"); |
568 | if (r < 0) | |
3164e3cb | 569 | goto fail; |
36ce7110 | 570 | if (r > 0) { |
414b304b ДГ |
571 | devptmx = strjoina(temporary_mount, "/dev/ptmx"); |
572 | if (symlink("pts/ptmx", devptmx) < 0) { | |
573 | r = -errno; | |
574 | goto fail; | |
575 | } | |
576 | } else { | |
577 | r = clone_device_node("/dev/ptmx", temporary_mount); | |
152c475f LP |
578 | if (r < 0) |
579 | goto fail; | |
580 | if (r == 0) { | |
581 | r = -ENXIO; | |
414b304b | 582 | goto fail; |
152c475f | 583 | } |
414b304b | 584 | } |
e06b6479 | 585 | |
63c372cb | 586 | devshm = strjoina(temporary_mount, "/dev/shm"); |
8d953682 | 587 | (void) mkdir(devshm, 0755); |
2b85f4e1 LP |
588 | r = mount("/dev/shm", devshm, NULL, MS_BIND, NULL); |
589 | if (r < 0) { | |
590 | r = -errno; | |
591 | goto fail; | |
592 | } | |
593 | ||
63c372cb | 594 | devmqueue = strjoina(temporary_mount, "/dev/mqueue"); |
dc751688 | 595 | (void) mkdir(devmqueue, 0755); |
3164e3cb | 596 | (void) mount("/dev/mqueue", devmqueue, NULL, MS_BIND, NULL); |
2b85f4e1 | 597 | |
63c372cb | 598 | devhugepages = strjoina(temporary_mount, "/dev/hugepages"); |
dc751688 | 599 | (void) mkdir(devhugepages, 0755); |
3164e3cb | 600 | (void) mount("/dev/hugepages", devhugepages, NULL, MS_BIND, NULL); |
2b85f4e1 | 601 | |
63c372cb | 602 | devlog = strjoina(temporary_mount, "/dev/log"); |
3164e3cb | 603 | (void) symlink("/run/systemd/journal/dev-log", devlog); |
82d25240 | 604 | |
7f112f50 | 605 | NULSTR_FOREACH(d, devnodes) { |
b5e99f23 ДГ |
606 | r = clone_device_node(d, temporary_mount); |
607 | if (r < 0) | |
2b85f4e1 | 608 | goto fail; |
7f112f50 LP |
609 | } |
610 | ||
03cfe0d5 | 611 | dev_setup(temporary_mount, UID_INVALID, GID_INVALID); |
7f112f50 | 612 | |
ee818b89 AC |
613 | /* Create the /dev directory if missing. It is more likely to be |
614 | * missing when the service is started with RootDirectory. This is | |
615 | * consistent with mount units creating the mount points when missing. | |
616 | */ | |
34de407a | 617 | (void) mkdir_p_label(mount_entry_path(m), 0755); |
ee818b89 | 618 | |
9e5f8252 | 619 | /* Unmount everything in old /dev */ |
34de407a LP |
620 | umount_recursive(mount_entry_path(m), 0); |
621 | if (mount(dev, mount_entry_path(m), NULL, MS_MOVE, NULL) < 0) { | |
2b85f4e1 LP |
622 | r = -errno; |
623 | goto fail; | |
624 | } | |
7f112f50 | 625 | |
2b85f4e1 LP |
626 | rmdir(dev); |
627 | rmdir(temporary_mount); | |
7f112f50 | 628 | |
2b85f4e1 | 629 | return 0; |
7f112f50 | 630 | |
2b85f4e1 LP |
631 | fail: |
632 | if (devpts) | |
633 | umount(devpts); | |
7f112f50 | 634 | |
2b85f4e1 LP |
635 | if (devshm) |
636 | umount(devshm); | |
7f112f50 | 637 | |
2b85f4e1 LP |
638 | if (devhugepages) |
639 | umount(devhugepages); | |
7f112f50 | 640 | |
2b85f4e1 LP |
641 | if (devmqueue) |
642 | umount(devmqueue); | |
7f112f50 | 643 | |
d267c5aa ZJS |
644 | umount(dev); |
645 | rmdir(dev); | |
2b85f4e1 | 646 | rmdir(temporary_mount); |
7f112f50 | 647 | |
2b85f4e1 | 648 | return r; |
7f112f50 LP |
649 | } |
650 | ||
2a2969fd | 651 | static int mount_bind_dev(const MountEntry *m) { |
5d997827 LP |
652 | int r; |
653 | ||
654 | assert(m); | |
655 | ||
656 | /* Implements the little brother of mount_private_dev(): simply bind mounts the host's /dev into the service's | |
657 | * /dev. This is only used when RootDirectory= is set. */ | |
658 | ||
645767d6 LP |
659 | (void) mkdir_p_label(mount_entry_path(m), 0755); |
660 | ||
5d997827 LP |
661 | r = path_is_mount_point(mount_entry_path(m), NULL, 0); |
662 | if (r < 0) | |
663 | return log_debug_errno(r, "Unable to determine whether /dev is already mounted: %m"); | |
664 | if (r > 0) /* make this a NOP if /dev is already a mount point */ | |
665 | return 0; | |
666 | ||
667 | if (mount("/dev", mount_entry_path(m), NULL, MS_BIND|MS_REC, NULL) < 0) | |
668 | return log_debug_errno(errno, "Failed to bind mount %s: %m", mount_entry_path(m)); | |
669 | ||
670 | return 1; | |
671 | } | |
672 | ||
2a2969fd | 673 | static int mount_sysfs(const MountEntry *m) { |
5d997827 LP |
674 | int r; |
675 | ||
676 | assert(m); | |
677 | ||
645767d6 LP |
678 | (void) mkdir_p_label(mount_entry_path(m), 0755); |
679 | ||
5d997827 LP |
680 | r = path_is_mount_point(mount_entry_path(m), NULL, 0); |
681 | if (r < 0) | |
682 | return log_debug_errno(r, "Unable to determine whether /sys is already mounted: %m"); | |
683 | if (r > 0) /* make this a NOP if /sys is already a mount point */ | |
684 | return 0; | |
685 | ||
686 | /* Bind mount the host's version so that we get all child mounts of it, too. */ | |
687 | if (mount("/sys", mount_entry_path(m), NULL, MS_BIND|MS_REC, NULL) < 0) | |
688 | return log_debug_errno(errno, "Failed to mount %s: %m", mount_entry_path(m)); | |
689 | ||
690 | return 1; | |
691 | } | |
692 | ||
2a2969fd | 693 | static int mount_procfs(const MountEntry *m) { |
5d997827 LP |
694 | int r; |
695 | ||
696 | assert(m); | |
697 | ||
645767d6 LP |
698 | (void) mkdir_p_label(mount_entry_path(m), 0755); |
699 | ||
5d997827 LP |
700 | r = path_is_mount_point(mount_entry_path(m), NULL, 0); |
701 | if (r < 0) | |
702 | return log_debug_errno(r, "Unable to determine whether /proc is already mounted: %m"); | |
703 | if (r > 0) /* make this a NOP if /proc is already a mount point */ | |
704 | return 0; | |
705 | ||
706 | /* Mount a new instance, so that we get the one that matches our user namespace, if we are running in one */ | |
707 | if (mount("proc", mount_entry_path(m), "proc", MS_NOSUID|MS_NOEXEC|MS_NODEV, NULL) < 0) | |
708 | return log_debug_errno(errno, "Failed to mount %s: %m", mount_entry_path(m)); | |
709 | ||
710 | return 1; | |
711 | } | |
712 | ||
2a2969fd | 713 | static int mount_empty_dir(const MountEntry *m) { |
6c47cd7d LP |
714 | assert(m); |
715 | ||
716 | /* First, get rid of everything that is below if there is anything. Then, overmount with our new empty dir */ | |
717 | ||
718 | (void) mkdir_p_label(mount_entry_path(m), 0755); | |
719 | (void) umount_recursive(mount_entry_path(m), 0); | |
720 | ||
721 | if (mount("tmpfs", mount_entry_path(m), "tmpfs", MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME, "mode=755") < 0) | |
722 | return log_debug_errno(errno, "Failed to mount %s: %m", mount_entry_path(m)); | |
723 | ||
724 | return 1; | |
725 | } | |
726 | ||
d2d6c096 LP |
727 | static int mount_entry_chase( |
728 | const char *root_directory, | |
2a2969fd | 729 | const MountEntry *m, |
d2d6c096 LP |
730 | const char *path, |
731 | char **location) { | |
732 | ||
8fceda93 LP |
733 | char *chased; |
734 | int r; | |
f863b1c6 | 735 | unsigned flags = 0; |
8fceda93 LP |
736 | |
737 | assert(m); | |
738 | ||
739 | /* Since mount() will always follow symlinks and we need to take the different root directory into account we | |
d2d6c096 LP |
740 | * chase the symlinks on our own first. This is called for the destination path, as well as the source path (if |
741 | * that applies). The result is stored in "location". */ | |
8fceda93 | 742 | |
f863b1c6 ZJS |
743 | if (IN_SET(m->mode, |
744 | BIND_MOUNT, | |
745 | BIND_MOUNT_RECURSIVE, | |
746 | PRIVATE_TMP, | |
f863b1c6 ZJS |
747 | PRIVATE_DEV, |
748 | BIND_DEV, | |
749 | EMPTY_DIR, | |
750 | SYSFS, | |
751 | PROCFS)) | |
752 | flags |= CHASE_NONEXISTENT; | |
753 | ||
754 | r = chase_symlinks(path, root_directory, flags, &chased); | |
8fceda93 | 755 | if (r == -ENOENT && m->ignore) { |
d2d6c096 | 756 | log_debug_errno(r, "Path %s does not exist, ignoring.", path); |
8fceda93 LP |
757 | return 0; |
758 | } | |
759 | if (r < 0) | |
d2d6c096 | 760 | return log_debug_errno(r, "Failed to follow symlinks on %s: %m", path); |
8fceda93 | 761 | |
d2d6c096 | 762 | log_debug("Followed symlinks %s → %s.", path, chased); |
8fceda93 | 763 | |
d2d6c096 LP |
764 | free(*location); |
765 | *location = chased; | |
8fceda93 LP |
766 | |
767 | return 1; | |
768 | } | |
769 | ||
ac0930c8 | 770 | static int apply_mount( |
8fceda93 | 771 | const char *root_directory, |
89bd586c | 772 | MountEntry *m) { |
ac0930c8 | 773 | |
a227a4be | 774 | bool rbind = true, make = false; |
15ae422b | 775 | const char *what; |
15ae422b | 776 | int r; |
15ae422b | 777 | |
c17ec25e | 778 | assert(m); |
15ae422b | 779 | |
d2d6c096 | 780 | r = mount_entry_chase(root_directory, m, mount_entry_path(m), &m->path_malloc); |
8fceda93 LP |
781 | if (r <= 0) |
782 | return r; | |
783 | ||
34de407a | 784 | log_debug("Applying namespace mount on %s", mount_entry_path(m)); |
fe3c2583 | 785 | |
c17ec25e | 786 | switch (m->mode) { |
15ae422b | 787 | |
160cfdbe LP |
788 | case INACCESSIBLE: { |
789 | struct stat target; | |
6d313367 LP |
790 | |
791 | /* First, get rid of everything that is below if there | |
792 | * is anything... Then, overmount it with an | |
c4b41707 | 793 | * inaccessible path. */ |
34de407a | 794 | (void) umount_recursive(mount_entry_path(m), 0); |
6d313367 | 795 | |
34de407a LP |
796 | if (lstat(mount_entry_path(m), &target) < 0) |
797 | return log_debug_errno(errno, "Failed to lstat() %s to determine what to mount over it: %m", mount_entry_path(m)); | |
15ae422b | 798 | |
c4b41707 | 799 | what = mode_to_inaccessible_node(target.st_mode); |
5fd7cf6f LP |
800 | if (!what) { |
801 | log_debug("File type not supported for inaccessible mounts. Note that symlinks are not allowed"); | |
c4b41707 AP |
802 | return -ELOOP; |
803 | } | |
804 | break; | |
160cfdbe | 805 | } |
fe3c2583 | 806 | |
15ae422b | 807 | case READONLY: |
15ae422b | 808 | case READWRITE: |
8fceda93 | 809 | r = path_is_mount_point(mount_entry_path(m), root_directory, 0); |
d944dc95 | 810 | if (r < 0) |
34de407a | 811 | return log_debug_errno(r, "Failed to determine whether %s is already a mount point: %m", mount_entry_path(m)); |
6b7c9f8b LP |
812 | if (r > 0) /* Nothing to do here, it is already a mount. We just later toggle the MS_RDONLY bit for the mount point if needed. */ |
813 | return 0; | |
6b7c9f8b | 814 | /* This isn't a mount point yet, let's make it one. */ |
34de407a | 815 | what = mount_entry_path(m); |
6b7c9f8b | 816 | break; |
15ae422b | 817 | |
d2d6c096 LP |
818 | case BIND_MOUNT: |
819 | rbind = false; | |
d2d6c096 | 820 | |
4831981d | 821 | _fallthrough_; |
d2d6c096 LP |
822 | case BIND_MOUNT_RECURSIVE: |
823 | /* Also chase the source mount */ | |
5d997827 | 824 | |
d2d6c096 LP |
825 | r = mount_entry_chase(root_directory, m, mount_entry_source(m), &m->source_malloc); |
826 | if (r <= 0) | |
827 | return r; | |
828 | ||
829 | what = mount_entry_source(m); | |
a227a4be | 830 | make = true; |
d2d6c096 LP |
831 | break; |
832 | ||
6c47cd7d LP |
833 | case EMPTY_DIR: |
834 | return mount_empty_dir(m); | |
835 | ||
ac0930c8 | 836 | case PRIVATE_TMP: |
89bd586c | 837 | what = mount_entry_source(m); |
a227a4be | 838 | make = true; |
15ae422b | 839 | break; |
e364ad06 | 840 | |
d6797c92 | 841 | case PRIVATE_DEV: |
5d997827 LP |
842 | return mount_private_dev(m); |
843 | ||
844 | case BIND_DEV: | |
845 | return mount_bind_dev(m); | |
846 | ||
847 | case SYSFS: | |
848 | return mount_sysfs(m); | |
849 | ||
850 | case PROCFS: | |
851 | return mount_procfs(m); | |
d6797c92 | 852 | |
e364ad06 LP |
853 | default: |
854 | assert_not_reached("Unknown mode"); | |
15ae422b LP |
855 | } |
856 | ||
ac0930c8 | 857 | assert(what); |
15ae422b | 858 | |
a227a4be LP |
859 | if (mount(what, mount_entry_path(m), NULL, MS_BIND|(rbind ? MS_REC : 0), NULL) < 0) { |
860 | bool try_again = false; | |
861 | r = -errno; | |
862 | ||
863 | if (r == -ENOENT && make) { | |
864 | struct stat st; | |
865 | ||
866 | /* Hmm, either the source or the destination are missing. Let's see if we can create the destination, then try again */ | |
867 | ||
868 | if (stat(what, &st) >= 0) { | |
869 | ||
870 | (void) mkdir_parents(mount_entry_path(m), 0755); | |
871 | ||
872 | if (S_ISDIR(st.st_mode)) | |
873 | try_again = mkdir(mount_entry_path(m), 0755) >= 0; | |
874 | else | |
875 | try_again = touch(mount_entry_path(m)) >= 0; | |
876 | } | |
877 | } | |
878 | ||
879 | if (try_again) { | |
880 | if (mount(what, mount_entry_path(m), NULL, MS_BIND|(rbind ? MS_REC : 0), NULL) < 0) | |
881 | r = -errno; | |
882 | else | |
883 | r = 0; | |
884 | } | |
885 | ||
886 | if (r < 0) | |
887 | return log_debug_errno(r, "Failed to mount %s to %s: %m", what, mount_entry_path(m)); | |
888 | } | |
6b7c9f8b | 889 | |
34de407a | 890 | log_debug("Successfully mounted %s to %s", what, mount_entry_path(m)); |
6b7c9f8b | 891 | return 0; |
ac0930c8 | 892 | } |
15ae422b | 893 | |
2a2969fd | 894 | static int make_read_only(const MountEntry *m, char **blacklist, FILE *proc_self_mountinfo) { |
6b7c9f8b | 895 | int r = 0; |
15ae422b | 896 | |
c17ec25e | 897 | assert(m); |
ac9de0b3 | 898 | assert(proc_self_mountinfo); |
ac0930c8 | 899 | |
34de407a | 900 | if (mount_entry_read_only(m)) |
ac9de0b3 | 901 | r = bind_remount_recursive_with_mountinfo(mount_entry_path(m), true, blacklist, proc_self_mountinfo); |
13e785f7 | 902 | else if (m->mode == PRIVATE_DEV) { /* Superblock can be readonly but the submounts can't */ |
34de407a | 903 | if (mount(NULL, mount_entry_path(m), NULL, MS_REMOUNT|DEV_MOUNT_OPTIONS|MS_RDONLY, NULL) < 0) |
6b7c9f8b | 904 | r = -errno; |
737ba3c8 | 905 | } else |
6b7c9f8b LP |
906 | return 0; |
907 | ||
908 | /* Not that we only turn on the MS_RDONLY flag here, we never turn it off. Something that was marked read-only | |
909 | * already stays this way. This improves compatibility with container managers, where we won't attempt to undo | |
910 | * read-only mounts already applied. */ | |
ac0930c8 | 911 | |
8fceda93 LP |
912 | if (r == -ENOENT && m->ignore) |
913 | r = 0; | |
5327c910 | 914 | |
1d54cd5d | 915 | return r; |
d944dc95 LP |
916 | } |
917 | ||
bb0ff3fb | 918 | static bool namespace_info_mount_apivfs(const char *root_directory, const NamespaceInfo *ns_info) { |
5d997827 LP |
919 | assert(ns_info); |
920 | ||
9c988f93 DH |
921 | /* |
922 | * ProtectControlGroups= and ProtectKernelTunables= imply MountAPIVFS=, | |
923 | * since to protect the API VFS mounts, they need to be around in the | |
924 | * first place... and RootDirectory= or RootImage= need to be set. | |
925 | */ | |
5d997827 | 926 | |
9c988f93 DH |
927 | /* root_directory should point to a mount point */ |
928 | return root_directory && | |
929 | (ns_info->mount_apivfs || | |
930 | ns_info->protect_control_groups || | |
931 | ns_info->protect_kernel_tunables); | |
5d997827 LP |
932 | } |
933 | ||
2652c6c1 | 934 | static unsigned namespace_calculate_mounts( |
9c988f93 | 935 | const char* root_directory, |
bb0ff3fb | 936 | const NamespaceInfo *ns_info, |
2652c6c1 DH |
937 | char** read_write_paths, |
938 | char** read_only_paths, | |
939 | char** inaccessible_paths, | |
6c47cd7d | 940 | char** empty_directories, |
d2d6c096 | 941 | unsigned n_bind_mounts, |
2652c6c1 DH |
942 | const char* tmp_dir, |
943 | const char* var_tmp_dir, | |
2652c6c1 DH |
944 | ProtectHome protect_home, |
945 | ProtectSystem protect_system) { | |
946 | ||
b6c432ca | 947 | unsigned protect_home_cnt; |
f471b2af DH |
948 | unsigned protect_system_cnt = |
949 | (protect_system == PROTECT_SYSTEM_STRICT ? | |
950 | ELEMENTSOF(protect_system_strict_table) : | |
951 | ((protect_system == PROTECT_SYSTEM_FULL) ? | |
952 | ELEMENTSOF(protect_system_full_table) : | |
953 | ((protect_system == PROTECT_SYSTEM_YES) ? | |
954 | ELEMENTSOF(protect_system_yes_table) : 0))); | |
955 | ||
b6c432ca DH |
956 | protect_home_cnt = |
957 | (protect_home == PROTECT_HOME_YES ? | |
958 | ELEMENTSOF(protect_home_yes_table) : | |
959 | ((protect_home == PROTECT_HOME_READ_ONLY) ? | |
960 | ELEMENTSOF(protect_home_read_only_table) : 0)); | |
961 | ||
2652c6c1 DH |
962 | return !!tmp_dir + !!var_tmp_dir + |
963 | strv_length(read_write_paths) + | |
964 | strv_length(read_only_paths) + | |
965 | strv_length(inaccessible_paths) + | |
6c47cd7d | 966 | strv_length(empty_directories) + |
d2d6c096 | 967 | n_bind_mounts + |
c575770b DH |
968 | ns_info->private_dev + |
969 | (ns_info->protect_kernel_tunables ? ELEMENTSOF(protect_kernel_tunables_table) : 0) + | |
970 | (ns_info->protect_control_groups ? 1 : 0) + | |
971 | (ns_info->protect_kernel_modules ? ELEMENTSOF(protect_kernel_modules_table) : 0) + | |
5d997827 | 972 | protect_home_cnt + protect_system_cnt + |
9c988f93 | 973 | (namespace_info_mount_apivfs(root_directory, ns_info) ? ELEMENTSOF(apivfs_table) : 0); |
2652c6c1 DH |
974 | } |
975 | ||
613b411c | 976 | int setup_namespace( |
ee818b89 | 977 | const char* root_directory, |
915e6d16 | 978 | const char* root_image, |
bb0ff3fb | 979 | const NamespaceInfo *ns_info, |
2a624c36 AP |
980 | char** read_write_paths, |
981 | char** read_only_paths, | |
982 | char** inaccessible_paths, | |
6c47cd7d | 983 | char** empty_directories, |
d2d6c096 LP |
984 | const BindMount *bind_mounts, |
985 | unsigned n_bind_mounts, | |
a004cb4c LP |
986 | const char* tmp_dir, |
987 | const char* var_tmp_dir, | |
1b8689f9 LP |
988 | ProtectHome protect_home, |
989 | ProtectSystem protect_system, | |
915e6d16 LP |
990 | unsigned long mount_flags, |
991 | DissectImageFlags dissect_image_flags) { | |
15ae422b | 992 | |
915e6d16 | 993 | _cleanup_(loop_device_unrefp) LoopDevice *loop_device = NULL; |
78ebe980 | 994 | _cleanup_(decrypted_image_unrefp) DecryptedImage *decrypted_image = NULL; |
915e6d16 | 995 | _cleanup_(dissected_image_unrefp) DissectedImage *dissected_image = NULL; |
78ebe980 | 996 | _cleanup_free_ void *root_hash = NULL; |
34de407a | 997 | MountEntry *m, *mounts = NULL; |
78ebe980 | 998 | size_t root_hash_size = 0; |
d944dc95 | 999 | bool make_slave = false; |
e908468b | 1000 | const char *root; |
f0a4feb0 | 1001 | unsigned n_mounts; |
d18aff04 | 1002 | bool require_prefix = false; |
c17ec25e | 1003 | int r = 0; |
15ae422b | 1004 | |
915e6d16 LP |
1005 | assert(ns_info); |
1006 | ||
613b411c | 1007 | if (mount_flags == 0) |
c17ec25e | 1008 | mount_flags = MS_SHARED; |
ac0930c8 | 1009 | |
915e6d16 LP |
1010 | if (root_image) { |
1011 | dissect_image_flags |= DISSECT_IMAGE_REQUIRE_ROOT; | |
1012 | ||
1013 | if (protect_system == PROTECT_SYSTEM_STRICT && strv_isempty(read_write_paths)) | |
1014 | dissect_image_flags |= DISSECT_IMAGE_READ_ONLY; | |
1015 | ||
1016 | r = loop_device_make_by_path(root_image, | |
1017 | dissect_image_flags & DISSECT_IMAGE_READ_ONLY ? O_RDONLY : O_RDWR, | |
1018 | &loop_device); | |
1019 | if (r < 0) | |
1020 | return r; | |
1021 | ||
78ebe980 LP |
1022 | r = root_hash_load(root_image, &root_hash, &root_hash_size); |
1023 | if (r < 0) | |
1024 | return r; | |
1025 | ||
1026 | r = dissect_image(loop_device->fd, root_hash, root_hash_size, dissect_image_flags, &dissected_image); | |
1027 | if (r < 0) | |
1028 | return r; | |
1029 | ||
1030 | r = dissected_image_decrypt(dissected_image, NULL, root_hash, root_hash_size, dissect_image_flags, &decrypted_image); | |
915e6d16 LP |
1031 | if (r < 0) |
1032 | return r; | |
915e6d16 LP |
1033 | } |
1034 | ||
e908468b LP |
1035 | if (root_directory) |
1036 | root = root_directory; | |
1037 | else if (root_image || n_bind_mounts > 0) { | |
1038 | ||
1039 | /* If we are booting from an image, create a mount point for the image, if it's still missing. We use | |
1040 | * the same mount point for all images, which is safe, since they all live in their own namespaces | |
1041 | * after all, and hence won't see each other. We also use such a root directory whenever there are bind | |
1042 | * mounts configured, so that their source mounts are never obstructed by mounts we already applied | |
1043 | * while we are applying them. */ | |
1044 | ||
1045 | root = "/run/systemd/unit-root"; | |
1046 | (void) mkdir_label(root, 0700); | |
d18aff04 | 1047 | require_prefix = true; |
e908468b LP |
1048 | } else |
1049 | root = NULL; | |
1050 | ||
cfbeb4ef | 1051 | n_mounts = namespace_calculate_mounts( |
e908468b | 1052 | root, |
cfbeb4ef LP |
1053 | ns_info, |
1054 | read_write_paths, | |
1055 | read_only_paths, | |
1056 | inaccessible_paths, | |
6c47cd7d | 1057 | empty_directories, |
f5c52a77 | 1058 | n_bind_mounts, |
cfbeb4ef LP |
1059 | tmp_dir, var_tmp_dir, |
1060 | protect_home, protect_system); | |
613b411c | 1061 | |
2652c6c1 | 1062 | /* Set mount slave mode */ |
e908468b | 1063 | if (root || n_mounts > 0) |
d944dc95 LP |
1064 | make_slave = true; |
1065 | ||
f0a4feb0 | 1066 | if (n_mounts > 0) { |
34de407a | 1067 | m = mounts = (MountEntry *) alloca0(n_mounts * sizeof(MountEntry)); |
d18aff04 | 1068 | r = append_access_mounts(&m, read_write_paths, READWRITE, require_prefix); |
613b411c | 1069 | if (r < 0) |
f0a4feb0 | 1070 | goto finish; |
613b411c | 1071 | |
d18aff04 | 1072 | r = append_access_mounts(&m, read_only_paths, READONLY, require_prefix); |
613b411c | 1073 | if (r < 0) |
f0a4feb0 | 1074 | goto finish; |
613b411c | 1075 | |
d18aff04 | 1076 | r = append_access_mounts(&m, inaccessible_paths, INACCESSIBLE, require_prefix); |
613b411c | 1077 | if (r < 0) |
f0a4feb0 | 1078 | goto finish; |
7ff7394d | 1079 | |
6c47cd7d LP |
1080 | r = append_empty_dir_mounts(&m, empty_directories); |
1081 | if (r < 0) | |
1082 | goto finish; | |
1083 | ||
d2d6c096 LP |
1084 | r = append_bind_mounts(&m, bind_mounts, n_bind_mounts); |
1085 | if (r < 0) | |
1086 | goto finish; | |
1087 | ||
613b411c | 1088 | if (tmp_dir) { |
34de407a | 1089 | *(m++) = (MountEntry) { |
5327c910 LP |
1090 | .path_const = "/tmp", |
1091 | .mode = PRIVATE_TMP, | |
89bd586c | 1092 | .source_const = tmp_dir, |
5327c910 | 1093 | }; |
613b411c | 1094 | } |
7ff7394d | 1095 | |
613b411c | 1096 | if (var_tmp_dir) { |
34de407a | 1097 | *(m++) = (MountEntry) { |
5327c910 | 1098 | .path_const = "/var/tmp", |
89bd586c YW |
1099 | .mode = PRIVATE_TMP, |
1100 | .source_const = var_tmp_dir, | |
5327c910 | 1101 | }; |
7ff7394d | 1102 | } |
ac0930c8 | 1103 | |
c575770b | 1104 | if (ns_info->private_dev) { |
34de407a | 1105 | *(m++) = (MountEntry) { |
5327c910 LP |
1106 | .path_const = "/dev", |
1107 | .mode = PRIVATE_DEV, | |
1108 | }; | |
7f112f50 LP |
1109 | } |
1110 | ||
c575770b | 1111 | if (ns_info->protect_kernel_tunables) { |
5327c910 | 1112 | r = append_static_mounts(&m, protect_kernel_tunables_table, ELEMENTSOF(protect_kernel_tunables_table), ns_info->ignore_protect_paths); |
c575770b | 1113 | if (r < 0) |
f0a4feb0 | 1114 | goto finish; |
c575770b DH |
1115 | } |
1116 | ||
1117 | if (ns_info->protect_kernel_modules) { | |
5327c910 | 1118 | r = append_static_mounts(&m, protect_kernel_modules_table, ELEMENTSOF(protect_kernel_modules_table), ns_info->ignore_protect_paths); |
c575770b | 1119 | if (r < 0) |
f0a4feb0 | 1120 | goto finish; |
c575770b | 1121 | } |
59eeb84b | 1122 | |
c575770b | 1123 | if (ns_info->protect_control_groups) { |
34de407a | 1124 | *(m++) = (MountEntry) { |
5327c910 LP |
1125 | .path_const = "/sys/fs/cgroup", |
1126 | .mode = READONLY, | |
1127 | }; | |
59eeb84b LP |
1128 | } |
1129 | ||
5327c910 | 1130 | r = append_protect_home(&m, protect_home, ns_info->ignore_protect_paths); |
b6c432ca | 1131 | if (r < 0) |
f0a4feb0 | 1132 | goto finish; |
417116f2 | 1133 | |
5327c910 | 1134 | r = append_protect_system(&m, protect_system, false); |
f471b2af | 1135 | if (r < 0) |
f0a4feb0 | 1136 | goto finish; |
417116f2 | 1137 | |
e908468b | 1138 | if (namespace_info_mount_apivfs(root, ns_info)) { |
5d997827 LP |
1139 | r = append_static_mounts(&m, apivfs_table, ELEMENTSOF(apivfs_table), ns_info->ignore_protect_paths); |
1140 | if (r < 0) | |
1141 | goto finish; | |
1142 | } | |
1143 | ||
f0a4feb0 | 1144 | assert(mounts + n_mounts == m); |
ac0930c8 | 1145 | |
5327c910 | 1146 | /* Prepend the root directory where that's necessary */ |
e908468b | 1147 | r = prefix_where_needed(mounts, n_mounts, root); |
5327c910 LP |
1148 | if (r < 0) |
1149 | goto finish; | |
1150 | ||
34de407a | 1151 | qsort(mounts, n_mounts, sizeof(MountEntry), mount_path_compare); |
fe3c2583 | 1152 | |
f0a4feb0 | 1153 | drop_duplicates(mounts, &n_mounts); |
e908468b | 1154 | drop_outside_root(root, mounts, &n_mounts); |
f0a4feb0 DH |
1155 | drop_inaccessible(mounts, &n_mounts); |
1156 | drop_nop(mounts, &n_mounts); | |
15ae422b LP |
1157 | } |
1158 | ||
d944dc95 LP |
1159 | if (unshare(CLONE_NEWNS) < 0) { |
1160 | r = -errno; | |
1161 | goto finish; | |
1162 | } | |
1e4e94c8 | 1163 | |
d944dc95 | 1164 | if (make_slave) { |
c2c13f2d LP |
1165 | /* Remount / as SLAVE so that nothing now mounted in the namespace |
1166 | shows up in the parent */ | |
d944dc95 LP |
1167 | if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL) < 0) { |
1168 | r = -errno; | |
1169 | goto finish; | |
1170 | } | |
ee818b89 AC |
1171 | } |
1172 | ||
915e6d16 | 1173 | if (root_image) { |
e908468b | 1174 | /* A root image is specified, mount it to the right place */ |
2d3a5a73 | 1175 | r = dissected_image_mount(dissected_image, root, UID_INVALID, dissect_image_flags); |
915e6d16 LP |
1176 | if (r < 0) |
1177 | goto finish; | |
1178 | ||
07ce7407 TM |
1179 | if (decrypted_image) { |
1180 | r = decrypted_image_relinquish(decrypted_image); | |
1181 | if (r < 0) | |
1182 | goto finish; | |
1183 | } | |
78ebe980 | 1184 | |
915e6d16 LP |
1185 | loop_device_relinquish(loop_device); |
1186 | ||
1187 | } else if (root_directory) { | |
1188 | ||
e908468b LP |
1189 | /* A root directory is specified. Turn its directory into bind mount, if it isn't one yet. */ |
1190 | r = path_is_mount_point(root, NULL, AT_SYMLINK_FOLLOW); | |
8f1ad200 | 1191 | if (r < 0) |
d944dc95 | 1192 | goto finish; |
8f1ad200 | 1193 | if (r == 0) { |
e908468b | 1194 | if (mount(root, root, NULL, MS_BIND|MS_REC, NULL) < 0) { |
8f1ad200 LP |
1195 | r = -errno; |
1196 | goto finish; | |
1197 | } | |
d944dc95 | 1198 | } |
e908468b LP |
1199 | |
1200 | } else if (root) { | |
1201 | ||
1202 | /* Let's mount the main root directory to the root directory to use */ | |
1203 | if (mount("/", root, NULL, MS_BIND|MS_REC, NULL) < 0) { | |
1204 | r = -errno; | |
1205 | goto finish; | |
1206 | } | |
ee818b89 | 1207 | } |
c2c13f2d | 1208 | |
4e0c20de LP |
1209 | /* Try to set up the new root directory before mounting anything else there. */ |
1210 | if (root_image || root_directory) | |
1211 | (void) base_filesystem_create(root, UID_INVALID, GID_INVALID); | |
1212 | ||
f0a4feb0 | 1213 | if (n_mounts > 0) { |
ac9de0b3 | 1214 | _cleanup_fclose_ FILE *proc_self_mountinfo = NULL; |
6b7c9f8b LP |
1215 | char **blacklist; |
1216 | unsigned j; | |
1217 | ||
ac9de0b3 TR |
1218 | /* Open /proc/self/mountinfo now as it may become unavailable if we mount anything on top of /proc. |
1219 | * For example, this is the case with the option: 'InaccessiblePaths=/proc' */ | |
1220 | proc_self_mountinfo = fopen("/proc/self/mountinfo", "re"); | |
1221 | if (!proc_self_mountinfo) { | |
1222 | r = -errno; | |
1223 | goto finish; | |
1224 | } | |
1225 | ||
6b7c9f8b | 1226 | /* First round, add in all special mounts we need */ |
f0a4feb0 | 1227 | for (m = mounts; m < mounts + n_mounts; ++m) { |
89bd586c | 1228 | r = apply_mount(root, m); |
c2c13f2d | 1229 | if (r < 0) |
d944dc95 | 1230 | goto finish; |
c2c13f2d | 1231 | } |
15ae422b | 1232 | |
6b7c9f8b | 1233 | /* Create a blacklist we can pass to bind_mount_recursive() */ |
f0a4feb0 DH |
1234 | blacklist = newa(char*, n_mounts+1); |
1235 | for (j = 0; j < n_mounts; j++) | |
34de407a | 1236 | blacklist[j] = (char*) mount_entry_path(mounts+j); |
6b7c9f8b LP |
1237 | blacklist[j] = NULL; |
1238 | ||
1239 | /* Second round, flip the ro bits if necessary. */ | |
f0a4feb0 | 1240 | for (m = mounts; m < mounts + n_mounts; ++m) { |
ac9de0b3 | 1241 | r = make_read_only(m, blacklist, proc_self_mountinfo); |
c2c13f2d | 1242 | if (r < 0) |
d944dc95 | 1243 | goto finish; |
c2c13f2d | 1244 | } |
15ae422b LP |
1245 | } |
1246 | ||
e908468b | 1247 | if (root) { |
ee818b89 | 1248 | /* MS_MOVE does not work on MS_SHARED so the remount MS_SHARED will be done later */ |
e908468b | 1249 | r = mount_move_root(root); |
d944dc95 LP |
1250 | if (r < 0) |
1251 | goto finish; | |
ee818b89 AC |
1252 | } |
1253 | ||
55fe7432 | 1254 | /* Remount / as the desired mode. Note that this will not |
c2c13f2d LP |
1255 | * reestablish propagation from our side to the host, since |
1256 | * what's disconnected is disconnected. */ | |
d944dc95 LP |
1257 | if (mount(NULL, "/", NULL, mount_flags | MS_REC, NULL) < 0) { |
1258 | r = -errno; | |
1259 | goto finish; | |
1260 | } | |
15ae422b | 1261 | |
d944dc95 | 1262 | r = 0; |
15ae422b | 1263 | |
d944dc95 | 1264 | finish: |
f0a4feb0 | 1265 | for (m = mounts; m < mounts + n_mounts; m++) |
1eb7e08e | 1266 | mount_entry_done(m); |
613b411c LP |
1267 | |
1268 | return r; | |
1269 | } | |
1270 | ||
d2d6c096 LP |
1271 | void bind_mount_free_many(BindMount *b, unsigned n) { |
1272 | unsigned i; | |
1273 | ||
1274 | assert(b || n == 0); | |
1275 | ||
1276 | for (i = 0; i < n; i++) { | |
1277 | free(b[i].source); | |
1278 | free(b[i].destination); | |
1279 | } | |
1280 | ||
1281 | free(b); | |
1282 | } | |
1283 | ||
1284 | int bind_mount_add(BindMount **b, unsigned *n, const BindMount *item) { | |
1285 | _cleanup_free_ char *s = NULL, *d = NULL; | |
1286 | BindMount *c; | |
1287 | ||
1288 | assert(b); | |
1289 | assert(n); | |
1290 | assert(item); | |
1291 | ||
1292 | s = strdup(item->source); | |
1293 | if (!s) | |
1294 | return -ENOMEM; | |
1295 | ||
1296 | d = strdup(item->destination); | |
1297 | if (!d) | |
1298 | return -ENOMEM; | |
1299 | ||
1300 | c = realloc_multiply(*b, sizeof(BindMount), *n + 1); | |
1301 | if (!c) | |
1302 | return -ENOMEM; | |
1303 | ||
1304 | *b = c; | |
1305 | ||
1306 | c[(*n) ++] = (BindMount) { | |
1307 | .source = s, | |
1308 | .destination = d, | |
1309 | .read_only = item->read_only, | |
1310 | .recursive = item->recursive, | |
1311 | .ignore_enoent = item->ignore_enoent, | |
1312 | }; | |
1313 | ||
1314 | s = d = NULL; | |
1315 | return 0; | |
1316 | } | |
1317 | ||
613b411c LP |
1318 | static int setup_one_tmp_dir(const char *id, const char *prefix, char **path) { |
1319 | _cleanup_free_ char *x = NULL; | |
6b46ea73 LP |
1320 | char bid[SD_ID128_STRING_MAX]; |
1321 | sd_id128_t boot_id; | |
1322 | int r; | |
613b411c LP |
1323 | |
1324 | assert(id); | |
1325 | assert(prefix); | |
1326 | assert(path); | |
1327 | ||
6b46ea73 LP |
1328 | /* We include the boot id in the directory so that after a |
1329 | * reboot we can easily identify obsolete directories. */ | |
1330 | ||
1331 | r = sd_id128_get_boot(&boot_id); | |
1332 | if (r < 0) | |
1333 | return r; | |
1334 | ||
605405c6 | 1335 | x = strjoin(prefix, "/systemd-private-", sd_id128_to_string(boot_id, bid), "-", id, "-XXXXXX"); |
613b411c LP |
1336 | if (!x) |
1337 | return -ENOMEM; | |
1338 | ||
1339 | RUN_WITH_UMASK(0077) | |
1340 | if (!mkdtemp(x)) | |
1341 | return -errno; | |
1342 | ||
1343 | RUN_WITH_UMASK(0000) { | |
1344 | char *y; | |
1345 | ||
63c372cb | 1346 | y = strjoina(x, "/tmp"); |
613b411c LP |
1347 | |
1348 | if (mkdir(y, 0777 | S_ISVTX) < 0) | |
1349 | return -errno; | |
c17ec25e | 1350 | } |
15ae422b | 1351 | |
613b411c LP |
1352 | *path = x; |
1353 | x = NULL; | |
1354 | ||
1355 | return 0; | |
1356 | } | |
1357 | ||
1358 | int setup_tmp_dirs(const char *id, char **tmp_dir, char **var_tmp_dir) { | |
1359 | char *a, *b; | |
1360 | int r; | |
1361 | ||
1362 | assert(id); | |
1363 | assert(tmp_dir); | |
1364 | assert(var_tmp_dir); | |
1365 | ||
1366 | r = setup_one_tmp_dir(id, "/tmp", &a); | |
1367 | if (r < 0) | |
1368 | return r; | |
1369 | ||
1370 | r = setup_one_tmp_dir(id, "/var/tmp", &b); | |
1371 | if (r < 0) { | |
1372 | char *t; | |
1373 | ||
63c372cb | 1374 | t = strjoina(a, "/tmp"); |
613b411c LP |
1375 | rmdir(t); |
1376 | rmdir(a); | |
1377 | ||
1378 | free(a); | |
1379 | return r; | |
1380 | } | |
1381 | ||
1382 | *tmp_dir = a; | |
1383 | *var_tmp_dir = b; | |
1384 | ||
1385 | return 0; | |
1386 | } | |
1387 | ||
1388 | int setup_netns(int netns_storage_socket[2]) { | |
1389 | _cleanup_close_ int netns = -1; | |
3ee897d6 | 1390 | int r, q; |
613b411c LP |
1391 | |
1392 | assert(netns_storage_socket); | |
1393 | assert(netns_storage_socket[0] >= 0); | |
1394 | assert(netns_storage_socket[1] >= 0); | |
1395 | ||
1396 | /* We use the passed socketpair as a storage buffer for our | |
76cd584b LP |
1397 | * namespace reference fd. Whatever process runs this first |
1398 | * shall create a new namespace, all others should just join | |
1399 | * it. To serialize that we use a file lock on the socket | |
1400 | * pair. | |
613b411c LP |
1401 | * |
1402 | * It's a bit crazy, but hey, works great! */ | |
1403 | ||
1404 | if (lockf(netns_storage_socket[0], F_LOCK, 0) < 0) | |
1405 | return -errno; | |
1406 | ||
3ee897d6 LP |
1407 | netns = receive_one_fd(netns_storage_socket[0], MSG_DONTWAIT); |
1408 | if (netns == -EAGAIN) { | |
613b411c LP |
1409 | /* Nothing stored yet, so let's create a new namespace */ |
1410 | ||
1411 | if (unshare(CLONE_NEWNET) < 0) { | |
1412 | r = -errno; | |
1413 | goto fail; | |
1414 | } | |
1415 | ||
1416 | loopback_setup(); | |
1417 | ||
1418 | netns = open("/proc/self/ns/net", O_RDONLY|O_CLOEXEC|O_NOCTTY); | |
1419 | if (netns < 0) { | |
1420 | r = -errno; | |
1421 | goto fail; | |
1422 | } | |
1423 | ||
1424 | r = 1; | |
613b411c | 1425 | |
3ee897d6 LP |
1426 | } else if (netns < 0) { |
1427 | r = netns; | |
1428 | goto fail; | |
613b411c | 1429 | |
3ee897d6 LP |
1430 | } else { |
1431 | /* Yay, found something, so let's join the namespace */ | |
613b411c LP |
1432 | if (setns(netns, CLONE_NEWNET) < 0) { |
1433 | r = -errno; | |
1434 | goto fail; | |
1435 | } | |
1436 | ||
1437 | r = 0; | |
1438 | } | |
1439 | ||
3ee897d6 LP |
1440 | q = send_one_fd(netns_storage_socket[1], netns, MSG_DONTWAIT); |
1441 | if (q < 0) { | |
1442 | r = q; | |
613b411c LP |
1443 | goto fail; |
1444 | } | |
1445 | ||
1446 | fail: | |
fe048ce5 | 1447 | (void) lockf(netns_storage_socket[0], F_ULOCK, 0); |
15ae422b LP |
1448 | return r; |
1449 | } | |
417116f2 | 1450 | |
6e2d7c4f MS |
1451 | bool ns_type_supported(NamespaceType type) { |
1452 | const char *t, *ns_proc; | |
1453 | ||
0fa5b831 LP |
1454 | t = namespace_type_to_string(type); |
1455 | if (!t) /* Don't know how to translate this? Then it's not supported */ | |
6e2d7c4f MS |
1456 | return false; |
1457 | ||
6e2d7c4f | 1458 | ns_proc = strjoina("/proc/self/ns/", t); |
6e2d7c4f MS |
1459 | return access(ns_proc, F_OK) == 0; |
1460 | } | |
1461 | ||
1b8689f9 LP |
1462 | static const char *const protect_home_table[_PROTECT_HOME_MAX] = { |
1463 | [PROTECT_HOME_NO] = "no", | |
1464 | [PROTECT_HOME_YES] = "yes", | |
1465 | [PROTECT_HOME_READ_ONLY] = "read-only", | |
417116f2 LP |
1466 | }; |
1467 | ||
1b8689f9 LP |
1468 | DEFINE_STRING_TABLE_LOOKUP(protect_home, ProtectHome); |
1469 | ||
5e1c6154 YW |
1470 | ProtectHome parse_protect_home_or_bool(const char *s) { |
1471 | int r; | |
1472 | ||
1473 | r = parse_boolean(s); | |
1474 | if (r > 0) | |
1475 | return PROTECT_HOME_YES; | |
1476 | if (r == 0) | |
1477 | return PROTECT_HOME_NO; | |
1478 | ||
1479 | return protect_home_from_string(s); | |
1480 | } | |
1481 | ||
1b8689f9 LP |
1482 | static const char *const protect_system_table[_PROTECT_SYSTEM_MAX] = { |
1483 | [PROTECT_SYSTEM_NO] = "no", | |
1484 | [PROTECT_SYSTEM_YES] = "yes", | |
1485 | [PROTECT_SYSTEM_FULL] = "full", | |
3f815163 | 1486 | [PROTECT_SYSTEM_STRICT] = "strict", |
1b8689f9 LP |
1487 | }; |
1488 | ||
1489 | DEFINE_STRING_TABLE_LOOKUP(protect_system, ProtectSystem); | |
6e2d7c4f | 1490 | |
03c791aa YW |
1491 | ProtectSystem parse_protect_system_or_bool(const char *s) { |
1492 | int r; | |
1493 | ||
1494 | r = parse_boolean(s); | |
1495 | if (r > 0) | |
1496 | return PROTECT_SYSTEM_YES; | |
1497 | if (r == 0) | |
1498 | return PROTECT_SYSTEM_NO; | |
1499 | ||
1500 | return protect_system_from_string(s); | |
1501 | } | |
1502 | ||
6e2d7c4f MS |
1503 | static const char* const namespace_type_table[] = { |
1504 | [NAMESPACE_MOUNT] = "mnt", | |
1505 | [NAMESPACE_CGROUP] = "cgroup", | |
1506 | [NAMESPACE_UTS] = "uts", | |
1507 | [NAMESPACE_IPC] = "ipc", | |
1508 | [NAMESPACE_USER] = "user", | |
1509 | [NAMESPACE_PID] = "pid", | |
1510 | [NAMESPACE_NET] = "net", | |
1511 | }; | |
1512 | ||
1513 | DEFINE_STRING_TABLE_LOOKUP(namespace_type, NamespaceType); |