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