]>
Commit | Line | Data |
---|---|---|
db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
15ae422b LP |
2 | |
3 | #include <errno.h> | |
e08f94ac | 4 | #include <linux/loop.h> |
07630cea | 5 | #include <sched.h> |
15ae422b | 6 | #include <stdio.h> |
07630cea | 7 | #include <sys/mount.h> |
07630cea | 8 | #include <unistd.h> |
25e870b5 | 9 | #include <linux/fs.h> |
15ae422b | 10 | |
b5efdb8a | 11 | #include "alloc-util.h" |
10404d52 | 12 | #include "base-filesystem.h" |
7f112f50 | 13 | #include "dev-setup.h" |
3ffd4af2 | 14 | #include "fd-util.h" |
e5f10caf | 15 | #include "format-util.h" |
d944dc95 | 16 | #include "fs-util.h" |
e908468b | 17 | #include "label.h" |
b3d13314 | 18 | #include "list.h" |
915e6d16 | 19 | #include "loop-util.h" |
07630cea | 20 | #include "loopback-setup.h" |
07630cea | 21 | #include "mkdir.h" |
4349cd7c | 22 | #include "mount-util.h" |
049af8ad | 23 | #include "mountpoint-util.h" |
0cb8e3d1 | 24 | #include "namespace-util.h" |
3ffd4af2 | 25 | #include "namespace.h" |
d8b4d14d | 26 | #include "nulstr-util.h" |
07630cea | 27 | #include "path-util.h" |
d7b8eec7 | 28 | #include "selinux-util.h" |
2583fbea | 29 | #include "socket-util.h" |
760877e9 | 30 | #include "sort-util.h" |
36ce7110 | 31 | #include "stat-util.h" |
8b43440b | 32 | #include "string-table.h" |
07630cea LP |
33 | #include "string-util.h" |
34 | #include "strv.h" | |
a652f050 | 35 | #include "tmpfile-util.h" |
affb60b1 | 36 | #include "umask-util.h" |
ee104e11 | 37 | #include "user-util.h" |
15ae422b | 38 | |
737ba3c8 | 39 | #define DEV_MOUNT_OPTIONS (MS_NOSUID|MS_STRICTATIME|MS_NOEXEC) |
40 | ||
c17ec25e | 41 | typedef enum MountMode { |
15ae422b LP |
42 | /* This is ordered by priority! */ |
43 | INACCESSIBLE, | |
b3d13314 | 44 | MOUNT_IMAGES, |
d2d6c096 LP |
45 | BIND_MOUNT, |
46 | BIND_MOUNT_RECURSIVE, | |
ac0930c8 | 47 | PRIVATE_TMP, |
56a13a49 | 48 | PRIVATE_TMP_READONLY, |
7f112f50 | 49 | PRIVATE_DEV, |
5d997827 | 50 | BIND_DEV, |
6c47cd7d | 51 | EMPTY_DIR, |
5d997827 LP |
52 | SYSFS, |
53 | PROCFS, | |
54 | READONLY, | |
59eeb84b | 55 | READWRITE, |
2abd4e38 | 56 | TMPFS, |
1e05071d | 57 | READWRITE_IMPLICIT, /* Should have the lowest priority. */ |
5beb8688 | 58 | _MOUNT_MODE_MAX, |
c17ec25e | 59 | } MountMode; |
15ae422b | 60 | |
34de407a | 61 | typedef struct MountEntry { |
5327c910 | 62 | const char *path_const; /* Memory allocated on stack or static */ |
cfbeb4ef | 63 | MountMode mode:5; |
5327c910 LP |
64 | bool ignore:1; /* Ignore if path does not exist? */ |
65 | bool has_prefix:1; /* Already is prefixed by the root dir? */ | |
cfbeb4ef | 66 | bool read_only:1; /* Shall this mount point be read-only? */ |
9ce4e4b0 | 67 | bool nosuid:1; /* Shall set MS_NOSUID on the mount itself */ |
088696fe | 68 | bool applied:1; /* Already applied */ |
55fe7432 | 69 | char *path_malloc; /* Use this instead of 'path_const' if we had to allocate memory */ |
b3d13314 | 70 | const char *source_const; /* The source path, for bind mounts or images */ |
d2d6c096 | 71 | char *source_malloc; |
2abd4e38 YW |
72 | const char *options_const;/* Mount options for tmpfs */ |
73 | char *options_malloc; | |
74 | unsigned long flags; /* Mount flags used by EMPTY_DIR and TMPFS. Do not include MS_RDONLY here, but please use read_only. */ | |
088696fe | 75 | unsigned n_followed; |
427353f6 | 76 | LIST_HEAD(MountOptions, image_options); |
34de407a | 77 | } MountEntry; |
15ae422b | 78 | |
5d997827 | 79 | /* If MountAPIVFS= is used, let's mount /sys and /proc into the it, but only as a fallback if the user hasn't mounted |
3fe91079 | 80 | * something there already. These mounts are hence overridden by any other explicitly configured mounts. */ |
5d997827 LP |
81 | static const MountEntry apivfs_table[] = { |
82 | { "/proc", PROCFS, false }, | |
83 | { "/dev", BIND_DEV, false }, | |
84 | { "/sys", SYSFS, false }, | |
85 | }; | |
f471b2af | 86 | |
11a30cec | 87 | /* ProtectKernelTunables= option and the related filesystem APIs */ |
34de407a | 88 | static const MountEntry protect_kernel_tunables_table[] = { |
1e05071d YW |
89 | { "/proc/acpi", READONLY, true }, |
90 | { "/proc/apm", READONLY, true }, /* Obsolete API, there's no point in permitting access to this, ever */ | |
91 | { "/proc/asound", READONLY, true }, | |
92 | { "/proc/bus", READONLY, true }, | |
93 | { "/proc/fs", READONLY, true }, | |
94 | { "/proc/irq", READONLY, true }, | |
95 | { "/proc/kallsyms", INACCESSIBLE, true }, | |
96 | { "/proc/kcore", INACCESSIBLE, true }, | |
97 | { "/proc/latency_stats", READONLY, true }, | |
98 | { "/proc/mtrr", READONLY, true }, | |
99 | { "/proc/scsi", READONLY, true }, | |
4e399953 | 100 | { "/proc/sys", READONLY, true }, |
1e05071d YW |
101 | { "/proc/sysrq-trigger", READONLY, true }, |
102 | { "/proc/timer_stats", READONLY, true }, | |
103 | { "/sys", READONLY, false }, | |
104 | { "/sys/fs/bpf", READONLY, true }, | |
105 | { "/sys/fs/cgroup", READWRITE_IMPLICIT, false }, /* READONLY is set by ProtectControlGroups= option */ | |
106 | { "/sys/fs/selinux", READWRITE_IMPLICIT, true }, | |
107 | { "/sys/kernel/debug", READONLY, true }, | |
108 | { "/sys/kernel/tracing", READONLY, true }, | |
11a30cec DH |
109 | }; |
110 | ||
c575770b | 111 | /* ProtectKernelModules= option */ |
34de407a | 112 | static const MountEntry protect_kernel_modules_table[] = { |
349cc4a5 | 113 | #if HAVE_SPLIT_USR |
c6232fb0 | 114 | { "/lib/modules", INACCESSIBLE, true }, |
c575770b | 115 | #endif |
c6232fb0 | 116 | { "/usr/lib/modules", INACCESSIBLE, true }, |
c575770b DH |
117 | }; |
118 | ||
94a7b275 KK |
119 | /* ProtectKernelLogs= option */ |
120 | static const MountEntry protect_kernel_logs_table[] = { | |
121 | { "/proc/kmsg", INACCESSIBLE, true }, | |
122 | { "/dev/kmsg", INACCESSIBLE, true }, | |
123 | }; | |
124 | ||
b6c432ca DH |
125 | /* |
126 | * ProtectHome=read-only table, protect $HOME and $XDG_RUNTIME_DIR and rest of | |
127 | * system should be protected by ProtectSystem= | |
128 | */ | |
34de407a | 129 | static const MountEntry protect_home_read_only_table[] = { |
c6232fb0 LP |
130 | { "/home", READONLY, true }, |
131 | { "/run/user", READONLY, true }, | |
132 | { "/root", READONLY, true }, | |
b6c432ca DH |
133 | }; |
134 | ||
e4da7d8c YW |
135 | /* ProtectHome=tmpfs table */ |
136 | static const MountEntry protect_home_tmpfs_table[] = { | |
7d85383e TM |
137 | { "/home", TMPFS, true, .read_only = true, .options_const = "mode=0755" TMPFS_LIMITS_EMPTY_OR_ALMOST, .flags = MS_NODEV|MS_STRICTATIME }, |
138 | { "/run/user", TMPFS, true, .read_only = true, .options_const = "mode=0755" TMPFS_LIMITS_EMPTY_OR_ALMOST, .flags = MS_NODEV|MS_STRICTATIME }, | |
139 | { "/root", TMPFS, true, .read_only = true, .options_const = "mode=0700" TMPFS_LIMITS_EMPTY_OR_ALMOST, .flags = MS_NODEV|MS_STRICTATIME }, | |
e4da7d8c YW |
140 | }; |
141 | ||
b6c432ca | 142 | /* ProtectHome=yes table */ |
34de407a | 143 | static const MountEntry protect_home_yes_table[] = { |
c6232fb0 LP |
144 | { "/home", INACCESSIBLE, true }, |
145 | { "/run/user", INACCESSIBLE, true }, | |
146 | { "/root", INACCESSIBLE, true }, | |
b6c432ca DH |
147 | }; |
148 | ||
f471b2af | 149 | /* ProtectSystem=yes table */ |
34de407a | 150 | static const MountEntry protect_system_yes_table[] = { |
c6232fb0 LP |
151 | { "/usr", READONLY, false }, |
152 | { "/boot", READONLY, true }, | |
153 | { "/efi", READONLY, true }, | |
7486f305 AB |
154 | #if HAVE_SPLIT_USR |
155 | { "/lib", READONLY, true }, | |
156 | { "/lib64", READONLY, true }, | |
157 | { "/bin", READONLY, true }, | |
671f0f8d | 158 | # if HAVE_SPLIT_BIN |
7486f305 | 159 | { "/sbin", READONLY, true }, |
671f0f8d | 160 | # endif |
7486f305 | 161 | #endif |
f471b2af DH |
162 | }; |
163 | ||
164 | /* ProtectSystem=full includes ProtectSystem=yes */ | |
34de407a | 165 | static const MountEntry protect_system_full_table[] = { |
c6232fb0 LP |
166 | { "/usr", READONLY, false }, |
167 | { "/boot", READONLY, true }, | |
168 | { "/efi", READONLY, true }, | |
169 | { "/etc", READONLY, false }, | |
7486f305 AB |
170 | #if HAVE_SPLIT_USR |
171 | { "/lib", READONLY, true }, | |
172 | { "/lib64", READONLY, true }, | |
173 | { "/bin", READONLY, true }, | |
671f0f8d | 174 | # if HAVE_SPLIT_BIN |
7486f305 | 175 | { "/sbin", READONLY, true }, |
671f0f8d | 176 | # endif |
7486f305 | 177 | #endif |
f471b2af DH |
178 | }; |
179 | ||
180 | /* | |
181 | * ProtectSystem=strict table. In this strict mode, we mount everything | |
182 | * read-only, except for /proc, /dev, /sys which are the kernel API VFS, | |
183 | * which are left writable, but PrivateDevices= + ProtectKernelTunables= | |
184 | * protect those, and these options should be fully orthogonal. | |
185 | * (And of course /home and friends are also left writable, as ProtectHome= | |
186 | * shall manage those, orthogonally). | |
187 | */ | |
34de407a | 188 | static const MountEntry protect_system_strict_table[] = { |
1e05071d YW |
189 | { "/", READONLY, false }, |
190 | { "/proc", READWRITE_IMPLICIT, false }, /* ProtectKernelTunables= */ | |
191 | { "/sys", READWRITE_IMPLICIT, false }, /* ProtectKernelTunables= */ | |
192 | { "/dev", READWRITE_IMPLICIT, false }, /* PrivateDevices= */ | |
193 | { "/home", READWRITE_IMPLICIT, true }, /* ProtectHome= */ | |
194 | { "/run/user", READWRITE_IMPLICIT, true }, /* ProtectHome= */ | |
195 | { "/root", READWRITE_IMPLICIT, true }, /* ProtectHome= */ | |
f471b2af DH |
196 | }; |
197 | ||
5beb8688 YW |
198 | static const char * const mount_mode_table[_MOUNT_MODE_MAX] = { |
199 | [INACCESSIBLE] = "inaccessible", | |
200 | [BIND_MOUNT] = "bind", | |
201 | [BIND_MOUNT_RECURSIVE] = "rbind", | |
202 | [PRIVATE_TMP] = "private-tmp", | |
203 | [PRIVATE_DEV] = "private-dev", | |
204 | [BIND_DEV] = "bind-dev", | |
205 | [EMPTY_DIR] = "empty", | |
206 | [SYSFS] = "sysfs", | |
207 | [PROCFS] = "procfs", | |
208 | [READONLY] = "read-only", | |
209 | [READWRITE] = "read-write", | |
210 | [TMPFS] = "tmpfs", | |
b3d13314 | 211 | [MOUNT_IMAGES] = "mount-images", |
5beb8688 YW |
212 | [READWRITE_IMPLICIT] = "rw-implicit", |
213 | }; | |
214 | ||
215 | DEFINE_PRIVATE_STRING_TABLE_LOOKUP_TO_STRING(mount_mode, MountMode); | |
216 | ||
34de407a | 217 | static const char *mount_entry_path(const MountEntry *p) { |
f0a4feb0 DH |
218 | assert(p); |
219 | ||
5327c910 LP |
220 | /* Returns the path of this bind mount. If the malloc()-allocated ->path_buffer field is set we return that, |
221 | * otherwise the stack/static ->path field is returned. */ | |
f0a4feb0 | 222 | |
5327c910 | 223 | return p->path_malloc ?: p->path_const; |
f0a4feb0 DH |
224 | } |
225 | ||
34de407a | 226 | static bool mount_entry_read_only(const MountEntry *p) { |
cfbeb4ef LP |
227 | assert(p); |
228 | ||
56a13a49 | 229 | return p->read_only || IN_SET(p->mode, READONLY, INACCESSIBLE, PRIVATE_TMP_READONLY); |
cfbeb4ef LP |
230 | } |
231 | ||
d2d6c096 LP |
232 | static const char *mount_entry_source(const MountEntry *p) { |
233 | assert(p); | |
234 | ||
235 | return p->source_malloc ?: p->source_const; | |
236 | } | |
237 | ||
2abd4e38 YW |
238 | static const char *mount_entry_options(const MountEntry *p) { |
239 | assert(p); | |
240 | ||
241 | return p->options_malloc ?: p->options_const; | |
242 | } | |
243 | ||
1eb7e08e LP |
244 | static void mount_entry_done(MountEntry *p) { |
245 | assert(p); | |
246 | ||
247 | p->path_malloc = mfree(p->path_malloc); | |
248 | p->source_malloc = mfree(p->source_malloc); | |
2abd4e38 | 249 | p->options_malloc = mfree(p->options_malloc); |
427353f6 | 250 | p->image_options = mount_options_free_all(p->image_options); |
1eb7e08e LP |
251 | } |
252 | ||
d18aff04 | 253 | static int append_access_mounts(MountEntry **p, char **strv, MountMode mode, bool forcibly_require_prefix) { |
15ae422b LP |
254 | char **i; |
255 | ||
613b411c LP |
256 | assert(p); |
257 | ||
1e05071d | 258 | /* Adds a list of user-supplied READWRITE/READWRITE_IMPLICIT/READONLY/INACCESSIBLE entries */ |
5327c910 | 259 | |
15ae422b | 260 | STRV_FOREACH(i, strv) { |
5327c910 LP |
261 | bool ignore = false, needs_prefix = false; |
262 | const char *e = *i; | |
15ae422b | 263 | |
5327c910 LP |
264 | /* Look for any prefixes */ |
265 | if (startswith(e, "-")) { | |
266 | e++; | |
9c94d52e | 267 | ignore = true; |
ea92ae33 | 268 | } |
5327c910 LP |
269 | if (startswith(e, "+")) { |
270 | e++; | |
271 | needs_prefix = true; | |
272 | } | |
ea92ae33 | 273 | |
baaa35ad ZJS |
274 | if (!path_is_absolute(e)) |
275 | return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), | |
276 | "Path is not absolute: %s", e); | |
15ae422b | 277 | |
34de407a | 278 | *((*p)++) = (MountEntry) { |
5327c910 LP |
279 | .path_const = e, |
280 | .mode = mode, | |
281 | .ignore = ignore, | |
d18aff04 | 282 | .has_prefix = !needs_prefix && !forcibly_require_prefix, |
5327c910 | 283 | }; |
15ae422b LP |
284 | } |
285 | ||
286 | return 0; | |
287 | } | |
288 | ||
6c47cd7d LP |
289 | static int append_empty_dir_mounts(MountEntry **p, char **strv) { |
290 | char **i; | |
291 | ||
292 | assert(p); | |
293 | ||
294 | /* Adds tmpfs mounts to provide readable but empty directories. This is primarily used to implement the | |
295 | * "/private/" boundary directories for DynamicUser=1. */ | |
296 | ||
297 | STRV_FOREACH(i, strv) { | |
298 | ||
299 | *((*p)++) = (MountEntry) { | |
300 | .path_const = *i, | |
301 | .mode = EMPTY_DIR, | |
302 | .ignore = false, | |
6c47cd7d | 303 | .read_only = true, |
7d85383e | 304 | .options_const = "mode=755" TMPFS_LIMITS_EMPTY_OR_ALMOST, |
2abd4e38 | 305 | .flags = MS_NOSUID|MS_NOEXEC|MS_NODEV|MS_STRICTATIME, |
6c47cd7d LP |
306 | }; |
307 | } | |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
da6053d0 LP |
312 | static int append_bind_mounts(MountEntry **p, const BindMount *binds, size_t n) { |
313 | size_t i; | |
d2d6c096 LP |
314 | |
315 | assert(p); | |
316 | ||
317 | for (i = 0; i < n; i++) { | |
318 | const BindMount *b = binds + i; | |
319 | ||
320 | *((*p)++) = (MountEntry) { | |
321 | .path_const = b->destination, | |
322 | .mode = b->recursive ? BIND_MOUNT_RECURSIVE : BIND_MOUNT, | |
323 | .read_only = b->read_only, | |
9ce4e4b0 | 324 | .nosuid = b->nosuid, |
d2d6c096 | 325 | .source_const = b->source, |
4ca763a9 | 326 | .ignore = b->ignore_enoent, |
d2d6c096 LP |
327 | }; |
328 | } | |
329 | ||
330 | return 0; | |
331 | } | |
332 | ||
b3d13314 LB |
333 | static int append_mount_images(MountEntry **p, const MountImage *mount_images, size_t n) { |
334 | assert(p); | |
335 | ||
336 | for (size_t i = 0; i < n; i++) { | |
337 | const MountImage *m = mount_images + i; | |
338 | ||
339 | *((*p)++) = (MountEntry) { | |
340 | .path_const = m->destination, | |
341 | .mode = MOUNT_IMAGES, | |
342 | .source_const = m->source, | |
427353f6 | 343 | .image_options = m->mount_options, |
b3d13314 LB |
344 | .ignore = m->ignore_enoent, |
345 | }; | |
346 | } | |
347 | ||
348 | return 0; | |
349 | } | |
350 | ||
da6053d0 | 351 | static int append_tmpfs_mounts(MountEntry **p, const TemporaryFileSystem *tmpfs, size_t n) { |
2abd4e38 YW |
352 | assert(p); |
353 | ||
b67ec8e5 | 354 | for (size_t i = 0; i < n; i++) { |
2abd4e38 YW |
355 | const TemporaryFileSystem *t = tmpfs + i; |
356 | _cleanup_free_ char *o = NULL, *str = NULL; | |
ad8e66dc | 357 | unsigned long flags; |
2abd4e38 | 358 | bool ro = false; |
b67ec8e5 | 359 | int r; |
2abd4e38 | 360 | |
baaa35ad ZJS |
361 | if (!path_is_absolute(t->path)) |
362 | return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), | |
363 | "Path is not absolute: %s", | |
364 | t->path); | |
2abd4e38 | 365 | |
b67ec8e5 | 366 | str = strjoin("mode=0755" NESTED_TMPFS_LIMITS ",", t->options); |
ad8e66dc AJ |
367 | if (!str) |
368 | return -ENOMEM; | |
2abd4e38 | 369 | |
ad8e66dc AJ |
370 | r = mount_option_mangle(str, MS_NODEV|MS_STRICTATIME, &flags, &o); |
371 | if (r < 0) | |
372 | return log_debug_errno(r, "Failed to parse mount option '%s': %m", str); | |
2abd4e38 | 373 | |
ad8e66dc AJ |
374 | ro = flags & MS_RDONLY; |
375 | if (ro) | |
376 | flags ^= MS_RDONLY; | |
2abd4e38 YW |
377 | |
378 | *((*p)++) = (MountEntry) { | |
379 | .path_const = t->path, | |
380 | .mode = TMPFS, | |
381 | .read_only = ro, | |
ad8e66dc | 382 | .options_malloc = TAKE_PTR(o), |
2abd4e38 YW |
383 | .flags = flags, |
384 | }; | |
2abd4e38 YW |
385 | } |
386 | ||
387 | return 0; | |
388 | } | |
389 | ||
da6053d0 LP |
390 | static int append_static_mounts(MountEntry **p, const MountEntry *mounts, size_t n, bool ignore_protect) { |
391 | size_t i; | |
11a30cec DH |
392 | |
393 | assert(p); | |
f471b2af | 394 | assert(mounts); |
11a30cec | 395 | |
5327c910 | 396 | /* Adds a list of static pre-defined entries */ |
f471b2af | 397 | |
5327c910 | 398 | for (i = 0; i < n; i++) |
34de407a LP |
399 | *((*p)++) = (MountEntry) { |
400 | .path_const = mount_entry_path(mounts+i), | |
5327c910 LP |
401 | .mode = mounts[i].mode, |
402 | .ignore = mounts[i].ignore || ignore_protect, | |
403 | }; | |
f471b2af DH |
404 | |
405 | return 0; | |
406 | } | |
407 | ||
34de407a | 408 | static int append_protect_home(MountEntry **p, ProtectHome protect_home, bool ignore_protect) { |
c575770b DH |
409 | assert(p); |
410 | ||
5327c910 | 411 | switch (protect_home) { |
b6c432ca | 412 | |
5327c910 | 413 | case PROTECT_HOME_NO: |
b6c432ca DH |
414 | return 0; |
415 | ||
b6c432ca | 416 | case PROTECT_HOME_READ_ONLY: |
5327c910 LP |
417 | return append_static_mounts(p, protect_home_read_only_table, ELEMENTSOF(protect_home_read_only_table), ignore_protect); |
418 | ||
e4da7d8c YW |
419 | case PROTECT_HOME_TMPFS: |
420 | return append_static_mounts(p, protect_home_tmpfs_table, ELEMENTSOF(protect_home_tmpfs_table), ignore_protect); | |
421 | ||
b6c432ca | 422 | case PROTECT_HOME_YES: |
5327c910 LP |
423 | return append_static_mounts(p, protect_home_yes_table, ELEMENTSOF(protect_home_yes_table), ignore_protect); |
424 | ||
b6c432ca | 425 | default: |
5327c910 | 426 | assert_not_reached("Unexpected ProtectHome= value"); |
b6c432ca | 427 | } |
b6c432ca DH |
428 | } |
429 | ||
34de407a | 430 | static int append_protect_system(MountEntry **p, ProtectSystem protect_system, bool ignore_protect) { |
f471b2af DH |
431 | assert(p); |
432 | ||
5327c910 LP |
433 | switch (protect_system) { |
434 | ||
435 | case PROTECT_SYSTEM_NO: | |
f471b2af DH |
436 | return 0; |
437 | ||
f471b2af | 438 | case PROTECT_SYSTEM_STRICT: |
5327c910 LP |
439 | return append_static_mounts(p, protect_system_strict_table, ELEMENTSOF(protect_system_strict_table), ignore_protect); |
440 | ||
f471b2af | 441 | case PROTECT_SYSTEM_YES: |
5327c910 LP |
442 | return append_static_mounts(p, protect_system_yes_table, ELEMENTSOF(protect_system_yes_table), ignore_protect); |
443 | ||
f471b2af | 444 | case PROTECT_SYSTEM_FULL: |
5327c910 LP |
445 | return append_static_mounts(p, protect_system_full_table, ELEMENTSOF(protect_system_full_table), ignore_protect); |
446 | ||
f471b2af | 447 | default: |
5327c910 | 448 | assert_not_reached("Unexpected ProtectSystem= value"); |
f471b2af | 449 | } |
11a30cec DH |
450 | } |
451 | ||
93bab288 | 452 | static int mount_path_compare(const MountEntry *a, const MountEntry *b) { |
a0827e2b | 453 | int d; |
15ae422b | 454 | |
6ee1a919 | 455 | /* If the paths are not equal, then order prefixes first */ |
93bab288 | 456 | d = path_compare(mount_entry_path(a), mount_entry_path(b)); |
6ee1a919 LP |
457 | if (d != 0) |
458 | return d; | |
15ae422b | 459 | |
6ee1a919 | 460 | /* If the paths are equal, check the mode */ |
93bab288 | 461 | return CMP((int) a->mode, (int) b->mode); |
15ae422b LP |
462 | } |
463 | ||
da6053d0 LP |
464 | static int prefix_where_needed(MountEntry *m, size_t n, const char *root_directory) { |
465 | size_t i; | |
5327c910 | 466 | |
4a756839 | 467 | /* Prefixes all paths in the bind mount table with the root directory if the entry needs that. */ |
5327c910 LP |
468 | |
469 | for (i = 0; i < n; i++) { | |
470 | char *s; | |
471 | ||
472 | if (m[i].has_prefix) | |
473 | continue; | |
474 | ||
c6134d3e | 475 | s = path_join(root_directory, mount_entry_path(m+i)); |
5327c910 LP |
476 | if (!s) |
477 | return -ENOMEM; | |
478 | ||
e282f51f | 479 | free_and_replace(m[i].path_malloc, s); |
5327c910 LP |
480 | m[i].has_prefix = true; |
481 | } | |
482 | ||
483 | return 0; | |
484 | } | |
485 | ||
da6053d0 | 486 | static void drop_duplicates(MountEntry *m, size_t *n) { |
34de407a | 487 | MountEntry *f, *t, *previous; |
15ae422b | 488 | |
c17ec25e | 489 | assert(m); |
15ae422b | 490 | assert(n); |
15ae422b | 491 | |
fe3c2583 LP |
492 | /* Drops duplicate entries. Expects that the array is properly ordered already. */ |
493 | ||
1d54cd5d | 494 | for (f = m, t = m, previous = NULL; f < m + *n; f++) { |
15ae422b | 495 | |
fe3c2583 | 496 | /* The first one wins (which is the one with the more restrictive mode), see mount_path_compare() |
088696fe LP |
497 | * above. Note that we only drop duplicates that haven't been mounted yet. */ |
498 | if (previous && | |
499 | path_equal(mount_entry_path(f), mount_entry_path(previous)) && | |
500 | !f->applied && !previous->applied) { | |
5beb8688 | 501 | log_debug("%s (%s) is duplicate.", mount_entry_path(f), mount_mode_to_string(f->mode)); |
34de407a | 502 | previous->read_only = previous->read_only || mount_entry_read_only(f); /* Propagate the read-only flag to the remaining entry */ |
1eb7e08e | 503 | mount_entry_done(f); |
15ae422b | 504 | continue; |
fe3c2583 | 505 | } |
15ae422b | 506 | |
e2d7c1a0 | 507 | *t = *f; |
15ae422b | 508 | previous = t; |
fe3c2583 LP |
509 | t++; |
510 | } | |
511 | ||
512 | *n = t - m; | |
513 | } | |
514 | ||
da6053d0 | 515 | static void drop_inaccessible(MountEntry *m, size_t *n) { |
34de407a | 516 | MountEntry *f, *t; |
fe3c2583 LP |
517 | const char *clear = NULL; |
518 | ||
519 | assert(m); | |
520 | assert(n); | |
521 | ||
522 | /* Drops all entries obstructed by another entry further up the tree. Expects that the array is properly | |
523 | * ordered already. */ | |
524 | ||
1d54cd5d | 525 | for (f = m, t = m; f < m + *n; f++) { |
fe3c2583 LP |
526 | |
527 | /* If we found a path set for INACCESSIBLE earlier, and this entry has it as prefix we should drop | |
528 | * it, as inaccessible paths really should drop the entire subtree. */ | |
34de407a LP |
529 | if (clear && path_startswith(mount_entry_path(f), clear)) { |
530 | log_debug("%s is masked by %s.", mount_entry_path(f), clear); | |
1eb7e08e | 531 | mount_entry_done(f); |
fe3c2583 LP |
532 | continue; |
533 | } | |
15ae422b | 534 | |
34de407a | 535 | clear = f->mode == INACCESSIBLE ? mount_entry_path(f) : NULL; |
fe3c2583 LP |
536 | |
537 | *t = *f; | |
15ae422b LP |
538 | t++; |
539 | } | |
540 | ||
c17ec25e | 541 | *n = t - m; |
15ae422b LP |
542 | } |
543 | ||
da6053d0 | 544 | static void drop_nop(MountEntry *m, size_t *n) { |
34de407a | 545 | MountEntry *f, *t; |
7648a565 LP |
546 | |
547 | assert(m); | |
548 | assert(n); | |
549 | ||
550 | /* Drops all entries which have an immediate parent that has the same type, as they are redundant. Assumes the | |
551 | * list is ordered by prefixes. */ | |
552 | ||
1d54cd5d | 553 | for (f = m, t = m; f < m + *n; f++) { |
7648a565 | 554 | |
1e05071d YW |
555 | /* Only suppress such subtrees for READONLY, READWRITE and READWRITE_IMPLICIT entries */ |
556 | if (IN_SET(f->mode, READONLY, READWRITE, READWRITE_IMPLICIT)) { | |
34de407a | 557 | MountEntry *p; |
7648a565 LP |
558 | bool found = false; |
559 | ||
560 | /* Now let's find the first parent of the entry we are looking at. */ | |
561 | for (p = t-1; p >= m; p--) { | |
34de407a | 562 | if (path_startswith(mount_entry_path(f), mount_entry_path(p))) { |
7648a565 LP |
563 | found = true; |
564 | break; | |
565 | } | |
566 | } | |
567 | ||
568 | /* We found it, let's see if it's the same mode, if so, we can drop this entry */ | |
569 | if (found && p->mode == f->mode) { | |
5beb8688 YW |
570 | log_debug("%s (%s) is made redundant by %s (%s)", |
571 | mount_entry_path(f), mount_mode_to_string(f->mode), | |
572 | mount_entry_path(p), mount_mode_to_string(p->mode)); | |
1eb7e08e | 573 | mount_entry_done(f); |
7648a565 LP |
574 | continue; |
575 | } | |
576 | } | |
577 | ||
578 | *t = *f; | |
579 | t++; | |
580 | } | |
581 | ||
582 | *n = t - m; | |
583 | } | |
584 | ||
da6053d0 | 585 | static void drop_outside_root(const char *root_directory, MountEntry *m, size_t *n) { |
34de407a | 586 | MountEntry *f, *t; |
cd2902c9 LP |
587 | |
588 | assert(m); | |
589 | assert(n); | |
590 | ||
1d54cd5d | 591 | /* Nothing to do */ |
cd2902c9 LP |
592 | if (!root_directory) |
593 | return; | |
594 | ||
595 | /* Drops all mounts that are outside of the root directory. */ | |
596 | ||
1d54cd5d | 597 | for (f = m, t = m; f < m + *n; f++) { |
cd2902c9 | 598 | |
34de407a LP |
599 | if (!path_startswith(mount_entry_path(f), root_directory)) { |
600 | log_debug("%s is outside of root directory.", mount_entry_path(f)); | |
1eb7e08e | 601 | mount_entry_done(f); |
cd2902c9 LP |
602 | continue; |
603 | } | |
604 | ||
605 | *t = *f; | |
606 | t++; | |
607 | } | |
608 | ||
609 | *n = t - m; | |
610 | } | |
611 | ||
b2a60844 LP |
612 | static int clone_device_node( |
613 | const char *d, | |
614 | const char *temporary_mount, | |
615 | bool *make_devnode) { | |
616 | ||
617 | _cleanup_free_ char *sl = NULL; | |
618 | const char *dn, *bn, *t; | |
b5e99f23 ДГ |
619 | struct stat st; |
620 | int r; | |
621 | ||
414b304b | 622 | if (stat(d, &st) < 0) { |
b2a60844 LP |
623 | if (errno == ENOENT) { |
624 | log_debug_errno(errno, "Device node '%s' to clone does not exist, ignoring.", d); | |
af984e13 | 625 | return -ENXIO; |
b2a60844 LP |
626 | } |
627 | ||
628 | return log_debug_errno(errno, "Failed to stat() device node '%s' to clone, ignoring: %m", d); | |
b5e99f23 ДГ |
629 | } |
630 | ||
631 | if (!S_ISBLK(st.st_mode) && | |
baaa35ad ZJS |
632 | !S_ISCHR(st.st_mode)) |
633 | return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), | |
634 | "Device node '%s' to clone is not a device node, ignoring.", | |
635 | d); | |
b5e99f23 | 636 | |
6f7f3a33 | 637 | dn = strjoina(temporary_mount, d); |
b5e99f23 | 638 | |
b2a60844 | 639 | /* First, try to create device node properly */ |
16498617 CB |
640 | if (*make_devnode) { |
641 | mac_selinux_create_file_prepare(d, st.st_mode); | |
642 | r = mknod(dn, st.st_mode, st.st_rdev); | |
643 | mac_selinux_create_file_clear(); | |
b2a60844 LP |
644 | if (r >= 0) |
645 | goto add_symlink; | |
16498617 CB |
646 | if (errno != EPERM) |
647 | return log_debug_errno(errno, "mknod failed for %s: %m", d); | |
648 | ||
b2a60844 | 649 | /* This didn't work, let's not try this again for the next iterations. */ |
16498617 CB |
650 | *make_devnode = false; |
651 | } | |
652 | ||
2aed63f4 | 653 | /* We're about to fall back to bind-mounting the device |
1acf344d CG |
654 | * node. So create a dummy bind-mount target. |
655 | * Do not prepare device-node SELinux label (see issue 13762) */ | |
16498617 | 656 | r = mknod(dn, S_IFREG, 0); |
16498617 | 657 | if (r < 0 && errno != EEXIST) |
b2a60844 | 658 | return log_debug_errno(errno, "mknod() fallback failed for '%s': %m", d); |
16498617 | 659 | |
21935150 LP |
660 | /* Fallback to bind-mounting: The assumption here is that all used device nodes carry standard |
661 | * properties. Specifically, the devices nodes we bind-mount should either be owned by root:root or | |
662 | * root:tty (e.g. /dev/tty, /dev/ptmx) and should not carry ACLs. */ | |
663 | r = mount_nofollow_verbose(LOG_DEBUG, d, dn, NULL, MS_BIND, NULL); | |
664 | if (r < 0) | |
665 | return r; | |
b2a60844 LP |
666 | |
667 | add_symlink: | |
668 | bn = path_startswith(d, "/dev/"); | |
669 | if (!bn) | |
670 | return 0; | |
671 | ||
672 | /* Create symlinks like /dev/char/1:9 → ../urandom */ | |
cbc056c8 ZJS |
673 | if (asprintf(&sl, "%s/dev/%s/%u:%u", |
674 | temporary_mount, | |
675 | S_ISCHR(st.st_mode) ? "char" : "block", | |
676 | major(st.st_rdev), minor(st.st_rdev)) < 0) | |
b2a60844 LP |
677 | return log_oom(); |
678 | ||
679 | (void) mkdir_parents(sl, 0755); | |
680 | ||
681 | t = strjoina("../", bn); | |
b2a60844 | 682 | if (symlink(t, sl) < 0) |
2e4a4fae | 683 | log_debug_errno(errno, "Failed to symlink '%s' to '%s', ignoring: %m", t, sl); |
b5e99f23 | 684 | |
af984e13 | 685 | return 0; |
b5e99f23 ДГ |
686 | } |
687 | ||
5d997827 | 688 | static int mount_private_dev(MountEntry *m) { |
7f112f50 LP |
689 | static const char devnodes[] = |
690 | "/dev/null\0" | |
691 | "/dev/zero\0" | |
692 | "/dev/full\0" | |
693 | "/dev/random\0" | |
694 | "/dev/urandom\0" | |
695 | "/dev/tty\0"; | |
696 | ||
2b85f4e1 | 697 | char temporary_mount[] = "/tmp/namespace-dev-XXXXXX"; |
63cc4c31 | 698 | const char *d, *dev = NULL, *devpts = NULL, *devshm = NULL, *devhugepages = NULL, *devmqueue = NULL, *devlog = NULL, *devptmx = NULL; |
16498617 | 699 | bool can_mknod = true; |
7f112f50 LP |
700 | _cleanup_umask_ mode_t u; |
701 | int r; | |
702 | ||
703 | assert(m); | |
704 | ||
705 | u = umask(0000); | |
706 | ||
2b85f4e1 | 707 | if (!mkdtemp(temporary_mount)) |
2e4a4fae | 708 | return log_debug_errno(errno, "Failed to create temporary directory '%s': %m", temporary_mount); |
2b85f4e1 | 709 | |
63c372cb | 710 | dev = strjoina(temporary_mount, "/dev"); |
dc751688 | 711 | (void) mkdir(dev, 0755); |
21935150 LP |
712 | r = mount_nofollow_verbose(LOG_DEBUG, "tmpfs", dev, "tmpfs", DEV_MOUNT_OPTIONS, "mode=755" TMPFS_LIMITS_DEV); |
713 | if (r < 0) | |
2b85f4e1 | 714 | goto fail; |
21935150 | 715 | |
c3151977 TM |
716 | r = label_fix_container(dev, "/dev", 0); |
717 | if (r < 0) { | |
718 | log_debug_errno(errno, "Failed to fix label of '%s' as /dev: %m", dev); | |
719 | goto fail; | |
720 | } | |
2b85f4e1 | 721 | |
63c372cb | 722 | devpts = strjoina(temporary_mount, "/dev/pts"); |
dc751688 | 723 | (void) mkdir(devpts, 0755); |
21935150 LP |
724 | r = mount_nofollow_verbose(LOG_DEBUG, "/dev/pts", devpts, NULL, MS_BIND, NULL); |
725 | if (r < 0) | |
2b85f4e1 | 726 | goto fail; |
2b85f4e1 | 727 | |
2e4a4fae YW |
728 | /* /dev/ptmx can either be a device node or a symlink to /dev/pts/ptmx. |
729 | * When /dev/ptmx a device node, /dev/pts/ptmx has 000 permissions making it inaccessible. | |
730 | * Thus, in that case make a clone. | |
731 | * In nspawn and other containers it will be a symlink, in that case make it a symlink. */ | |
36ce7110 | 732 | r = is_symlink("/dev/ptmx"); |
2e4a4fae YW |
733 | if (r < 0) { |
734 | log_debug_errno(r, "Failed to detect whether /dev/ptmx is a symlink or not: %m"); | |
3164e3cb | 735 | goto fail; |
2e4a4fae | 736 | } else if (r > 0) { |
414b304b ДГ |
737 | devptmx = strjoina(temporary_mount, "/dev/ptmx"); |
738 | if (symlink("pts/ptmx", devptmx) < 0) { | |
2e4a4fae | 739 | r = log_debug_errno(errno, "Failed to create a symlink '%s' to pts/ptmx: %m", devptmx); |
414b304b ДГ |
740 | goto fail; |
741 | } | |
742 | } else { | |
16498617 | 743 | r = clone_device_node("/dev/ptmx", temporary_mount, &can_mknod); |
152c475f LP |
744 | if (r < 0) |
745 | goto fail; | |
414b304b | 746 | } |
e06b6479 | 747 | |
63c372cb | 748 | devshm = strjoina(temporary_mount, "/dev/shm"); |
8d953682 | 749 | (void) mkdir(devshm, 0755); |
21935150 LP |
750 | r = mount_nofollow_verbose(LOG_DEBUG, "/dev/shm", devshm, NULL, MS_BIND, NULL); |
751 | if (r < 0) | |
2b85f4e1 | 752 | goto fail; |
2b85f4e1 | 753 | |
63c372cb | 754 | devmqueue = strjoina(temporary_mount, "/dev/mqueue"); |
dc751688 | 755 | (void) mkdir(devmqueue, 0755); |
21935150 | 756 | (void) mount_nofollow_verbose(LOG_DEBUG, "/dev/mqueue", devmqueue, NULL, MS_BIND, NULL); |
2b85f4e1 | 757 | |
63c372cb | 758 | devhugepages = strjoina(temporary_mount, "/dev/hugepages"); |
dc751688 | 759 | (void) mkdir(devhugepages, 0755); |
21935150 | 760 | (void) mount_nofollow_verbose(LOG_DEBUG, "/dev/hugepages", devhugepages, NULL, MS_BIND, NULL); |
2b85f4e1 | 761 | |
63c372cb | 762 | devlog = strjoina(temporary_mount, "/dev/log"); |
2e4a4fae YW |
763 | if (symlink("/run/systemd/journal/dev-log", devlog) < 0) |
764 | log_debug_errno(errno, "Failed to create a symlink '%s' to /run/systemd/journal/dev-log, ignoring: %m", devlog); | |
82d25240 | 765 | |
7f112f50 | 766 | NULSTR_FOREACH(d, devnodes) { |
16498617 | 767 | r = clone_device_node(d, temporary_mount, &can_mknod); |
37b22b3b | 768 | /* ENXIO means the *source* is not a device file, skip creation in that case */ |
af984e13 | 769 | if (r < 0 && r != -ENXIO) |
2b85f4e1 | 770 | goto fail; |
7f112f50 LP |
771 | } |
772 | ||
2e4a4fae YW |
773 | r = dev_setup(temporary_mount, UID_INVALID, GID_INVALID); |
774 | if (r < 0) | |
105a1a36 | 775 | log_debug_errno(r, "Failed to set up basic device tree at '%s', ignoring: %m", temporary_mount); |
7f112f50 | 776 | |
ee818b89 AC |
777 | /* Create the /dev directory if missing. It is more likely to be |
778 | * missing when the service is started with RootDirectory. This is | |
779 | * consistent with mount units creating the mount points when missing. | |
780 | */ | |
34de407a | 781 | (void) mkdir_p_label(mount_entry_path(m), 0755); |
ee818b89 | 782 | |
9e5f8252 | 783 | /* Unmount everything in old /dev */ |
2e4a4fae YW |
784 | r = umount_recursive(mount_entry_path(m), 0); |
785 | if (r < 0) | |
786 | log_debug_errno(r, "Failed to unmount directories below '%s', ignoring: %m", mount_entry_path(m)); | |
787 | ||
21935150 LP |
788 | r = mount_nofollow_verbose(LOG_DEBUG, dev, mount_entry_path(m), NULL, MS_MOVE, NULL); |
789 | if (r < 0) | |
2b85f4e1 | 790 | goto fail; |
7f112f50 | 791 | |
1019a48f LP |
792 | (void) rmdir(dev); |
793 | (void) rmdir(temporary_mount); | |
7f112f50 | 794 | |
2b85f4e1 | 795 | return 0; |
7f112f50 | 796 | |
2b85f4e1 LP |
797 | fail: |
798 | if (devpts) | |
21935150 | 799 | (void) umount_verbose(LOG_DEBUG, devpts, UMOUNT_NOFOLLOW); |
7f112f50 | 800 | |
2b85f4e1 | 801 | if (devshm) |
21935150 | 802 | (void) umount_verbose(LOG_DEBUG, devshm, UMOUNT_NOFOLLOW); |
7f112f50 | 803 | |
2b85f4e1 | 804 | if (devhugepages) |
21935150 | 805 | (void) umount_verbose(LOG_DEBUG, devhugepages, UMOUNT_NOFOLLOW); |
7f112f50 | 806 | |
2b85f4e1 | 807 | if (devmqueue) |
21935150 | 808 | (void) umount_verbose(LOG_DEBUG, devmqueue, UMOUNT_NOFOLLOW); |
7f112f50 | 809 | |
21935150 | 810 | (void) umount_verbose(LOG_DEBUG, dev, UMOUNT_NOFOLLOW); |
1019a48f LP |
811 | (void) rmdir(dev); |
812 | (void) rmdir(temporary_mount); | |
7f112f50 | 813 | |
2b85f4e1 | 814 | return r; |
7f112f50 LP |
815 | } |
816 | ||
2a2969fd | 817 | static int mount_bind_dev(const MountEntry *m) { |
5d997827 LP |
818 | int r; |
819 | ||
820 | assert(m); | |
821 | ||
822 | /* Implements the little brother of mount_private_dev(): simply bind mounts the host's /dev into the service's | |
823 | * /dev. This is only used when RootDirectory= is set. */ | |
824 | ||
645767d6 LP |
825 | (void) mkdir_p_label(mount_entry_path(m), 0755); |
826 | ||
5d997827 LP |
827 | r = path_is_mount_point(mount_entry_path(m), NULL, 0); |
828 | if (r < 0) | |
829 | return log_debug_errno(r, "Unable to determine whether /dev is already mounted: %m"); | |
830 | if (r > 0) /* make this a NOP if /dev is already a mount point */ | |
831 | return 0; | |
832 | ||
21935150 LP |
833 | r = mount_nofollow_verbose(LOG_DEBUG, "/dev", mount_entry_path(m), NULL, MS_BIND|MS_REC, NULL); |
834 | if (r < 0) | |
835 | return r; | |
5d997827 LP |
836 | |
837 | return 1; | |
838 | } | |
839 | ||
2a2969fd | 840 | static int mount_sysfs(const MountEntry *m) { |
5d997827 LP |
841 | int r; |
842 | ||
843 | assert(m); | |
844 | ||
645767d6 LP |
845 | (void) mkdir_p_label(mount_entry_path(m), 0755); |
846 | ||
5d997827 LP |
847 | r = path_is_mount_point(mount_entry_path(m), NULL, 0); |
848 | if (r < 0) | |
849 | return log_debug_errno(r, "Unable to determine whether /sys is already mounted: %m"); | |
850 | if (r > 0) /* make this a NOP if /sys is already a mount point */ | |
851 | return 0; | |
852 | ||
853 | /* Bind mount the host's version so that we get all child mounts of it, too. */ | |
21935150 LP |
854 | r = mount_nofollow_verbose(LOG_DEBUG, "/sys", mount_entry_path(m), NULL, MS_BIND|MS_REC, NULL); |
855 | if (r < 0) | |
856 | return r; | |
5d997827 LP |
857 | |
858 | return 1; | |
859 | } | |
860 | ||
4e399953 LP |
861 | static int mount_procfs(const MountEntry *m, const NamespaceInfo *ns_info) { |
862 | const char *entry_path; | |
21935150 | 863 | int r; |
5d997827 LP |
864 | |
865 | assert(m); | |
4e399953 | 866 | assert(ns_info); |
5d997827 | 867 | |
4e399953 | 868 | entry_path = mount_entry_path(m); |
645767d6 | 869 | |
4e399953 LP |
870 | /* Mount a new instance, so that we get the one that matches our user namespace, if we are running in |
871 | * one. i.e we don't reuse existing mounts here under any condition, we want a new instance owned by | |
872 | * our user namespace and with our hidepid= settings applied. Hence, let's get rid of everything | |
873 | * mounted on /proc/ first. */ | |
5d997827 | 874 | |
4e399953 LP |
875 | (void) mkdir_p_label(entry_path, 0755); |
876 | (void) umount_recursive(entry_path, 0); | |
877 | ||
878 | if (ns_info->protect_proc != PROTECT_PROC_DEFAULT || | |
879 | ns_info->proc_subset != PROC_SUBSET_ALL) { | |
880 | _cleanup_free_ char *opts = NULL; | |
881 | ||
882 | /* Starting with kernel 5.8 procfs' hidepid= logic is truly per-instance (previously it | |
883 | * pretended to be per-instance but actually was per-namespace), hence let's make use of it | |
884 | * if requested. To make sure this logic succeeds only on kernels where hidepid= is | |
885 | * per-instance, we'll exclusively use the textual value for hidepid=, since support was | |
886 | * added in the same commit: if it's supported it is thus also per-instance. */ | |
887 | ||
888 | opts = strjoin("hidepid=", | |
889 | ns_info->protect_proc == PROTECT_PROC_DEFAULT ? "off" : | |
890 | protect_proc_to_string(ns_info->protect_proc), | |
891 | ns_info->proc_subset == PROC_SUBSET_PID ? ",subset=pid" : ""); | |
892 | if (!opts) | |
893 | return -ENOMEM; | |
894 | ||
21935150 LP |
895 | r = mount_nofollow_verbose(LOG_DEBUG, "proc", entry_path, "proc", MS_NOSUID|MS_NOEXEC|MS_NODEV, opts); |
896 | if (r < 0) { | |
897 | if (r != -EINVAL) | |
898 | return r; | |
4e399953 LP |
899 | |
900 | /* If this failed with EINVAL then this likely means the textual hidepid= stuff is | |
901 | * not supported by the kernel, and thus the per-instance hidepid= neither, which | |
902 | * means we really don't want to use it, since it would affect our host's /proc | |
903 | * mount. Hence let's gracefully fallback to a classic, unrestricted version. */ | |
904 | } else | |
905 | return 1; | |
906 | } | |
907 | ||
21935150 LP |
908 | r = mount_nofollow_verbose(LOG_DEBUG, "proc", entry_path, "proc", MS_NOSUID|MS_NOEXEC|MS_NODEV, NULL); |
909 | if (r < 0) | |
910 | return r; | |
5d997827 LP |
911 | |
912 | return 1; | |
913 | } | |
914 | ||
2abd4e38 | 915 | static int mount_tmpfs(const MountEntry *m) { |
df6b900a | 916 | const char *entry_path, *inner_path; |
abad72be | 917 | int r; |
abad72be | 918 | |
6c47cd7d LP |
919 | assert(m); |
920 | ||
df6b900a LP |
921 | entry_path = mount_entry_path(m); |
922 | inner_path = m->path_const; | |
923 | ||
2abd4e38 | 924 | /* First, get rid of everything that is below if there is anything. Then, overmount with our new tmpfs */ |
6c47cd7d | 925 | |
abad72be CG |
926 | (void) mkdir_p_label(entry_path, 0755); |
927 | (void) umount_recursive(entry_path, 0); | |
6c47cd7d | 928 | |
21935150 LP |
929 | r = mount_nofollow_verbose(LOG_DEBUG, "tmpfs", entry_path, "tmpfs", m->flags, mount_entry_options(m)); |
930 | if (r < 0) | |
931 | return r; | |
abad72be | 932 | |
df6b900a | 933 | r = label_fix_container(entry_path, inner_path, 0); |
abad72be | 934 | if (r < 0) |
df6b900a | 935 | return log_debug_errno(r, "Failed to fix label of '%s' as '%s': %m", entry_path, inner_path); |
6c47cd7d LP |
936 | |
937 | return 1; | |
938 | } | |
939 | ||
b3d13314 LB |
940 | static int mount_images(const MountEntry *m) { |
941 | _cleanup_(loop_device_unrefp) LoopDevice *loop_device = NULL; | |
942 | _cleanup_(decrypted_image_unrefp) DecryptedImage *decrypted_image = NULL; | |
943 | _cleanup_(dissected_image_unrefp) DissectedImage *dissected_image = NULL; | |
aee36b4e | 944 | _cleanup_(verity_settings_done) VeritySettings verity = VERITY_SETTINGS_DEFAULT; |
89e62e0b | 945 | DissectImageFlags dissect_image_flags; |
b3d13314 LB |
946 | int r; |
947 | ||
89e62e0b LP |
948 | assert(m); |
949 | ||
950 | r = verity_settings_load(&verity, mount_entry_source(m), NULL, NULL); | |
b3d13314 LB |
951 | if (r < 0) |
952 | return log_debug_errno(r, "Failed to load root hash: %m"); | |
b3d13314 | 953 | |
89e62e0b LP |
954 | dissect_image_flags = |
955 | (m->read_only ? DISSECT_IMAGE_READ_ONLY : 0) | | |
956 | (verity.data_path ? DISSECT_IMAGE_NO_PARTITION_TABLE : 0); | |
957 | ||
958 | r = loop_device_make_by_path( | |
959 | mount_entry_source(m), | |
960 | m->read_only ? O_RDONLY : -1 /* < 0 means writable if possible, read-only as fallback */, | |
961 | verity.data_path ? 0 : LO_FLAGS_PARTSCAN, | |
962 | &loop_device); | |
b3d13314 LB |
963 | if (r < 0) |
964 | return log_debug_errno(r, "Failed to create loop device for image: %m"); | |
965 | ||
89e62e0b LP |
966 | r = dissect_image( |
967 | loop_device->fd, | |
968 | &verity, | |
969 | m->image_options, | |
970 | dissect_image_flags, | |
971 | &dissected_image); | |
b3d13314 | 972 | /* No partition table? Might be a single-filesystem image, try again */ |
89e62e0b LP |
973 | if (!verity.data_path && r == -ENOPKG) |
974 | r = dissect_image( | |
975 | loop_device->fd, | |
976 | &verity, | |
977 | m->image_options, | |
978 | dissect_image_flags|DISSECT_IMAGE_NO_PARTITION_TABLE, | |
979 | &dissected_image); | |
b3d13314 LB |
980 | if (r < 0) |
981 | return log_debug_errno(r, "Failed to dissect image: %m"); | |
982 | ||
89e62e0b LP |
983 | r = dissected_image_decrypt( |
984 | dissected_image, | |
985 | NULL, | |
986 | &verity, | |
987 | dissect_image_flags, | |
988 | &decrypted_image); | |
b3d13314 LB |
989 | if (r < 0) |
990 | return log_debug_errno(r, "Failed to decrypt dissected image: %m"); | |
991 | ||
992 | r = mkdir_p_label(mount_entry_path(m), 0755); | |
993 | if (r < 0) | |
994 | return log_debug_errno(r, "Failed to create destination directory %s: %m", mount_entry_path(m)); | |
995 | r = umount_recursive(mount_entry_path(m), 0); | |
996 | if (r < 0) | |
997 | return log_debug_errno(r, "Failed to umount under destination directory %s: %m", mount_entry_path(m)); | |
998 | ||
999 | r = dissected_image_mount(dissected_image, mount_entry_path(m), UID_INVALID, dissect_image_flags); | |
1000 | if (r < 0) | |
1001 | return log_debug_errno(r, "Failed to mount image: %m"); | |
1002 | ||
1003 | if (decrypted_image) { | |
1004 | r = decrypted_image_relinquish(decrypted_image); | |
1005 | if (r < 0) | |
1006 | return log_debug_errno(r, "Failed to relinquish decrypted image: %m"); | |
1007 | } | |
1008 | ||
1009 | loop_device_relinquish(loop_device); | |
1010 | ||
1011 | return 1; | |
1012 | } | |
1013 | ||
088696fe | 1014 | static int follow_symlink( |
d2d6c096 | 1015 | const char *root_directory, |
088696fe | 1016 | MountEntry *m) { |
d2d6c096 | 1017 | |
088696fe | 1018 | _cleanup_free_ char *target = NULL; |
8fceda93 LP |
1019 | int r; |
1020 | ||
088696fe LP |
1021 | /* Let's chase symlinks, but only one step at a time. That's because depending where the symlink points we |
1022 | * might need to change the order in which we mount stuff. Hence: let's normalize piecemeal, and do one step at | |
1023 | * a time by specifying CHASE_STEP. This function returns 0 if we resolved one step, and > 0 if we reached the | |
1024 | * end and already have a fully normalized name. */ | |
8fceda93 | 1025 | |
a5648b80 | 1026 | r = chase_symlinks(mount_entry_path(m), root_directory, CHASE_STEP|CHASE_NONEXISTENT, &target, NULL); |
088696fe LP |
1027 | if (r < 0) |
1028 | return log_debug_errno(r, "Failed to chase symlinks '%s': %m", mount_entry_path(m)); | |
1029 | if (r > 0) /* Reached the end, nothing more to resolve */ | |
1030 | return 1; | |
8fceda93 | 1031 | |
baaa35ad ZJS |
1032 | if (m->n_followed >= CHASE_SYMLINKS_MAX) /* put a boundary on things */ |
1033 | return log_debug_errno(SYNTHETIC_ERRNO(ELOOP), | |
1034 | "Symlink loop on '%s'.", | |
1035 | mount_entry_path(m)); | |
8fceda93 | 1036 | |
088696fe | 1037 | log_debug("Followed mount entry path symlink %s → %s.", mount_entry_path(m), target); |
8fceda93 | 1038 | |
088696fe LP |
1039 | free_and_replace(m->path_malloc, target); |
1040 | m->has_prefix = true; | |
8fceda93 | 1041 | |
088696fe LP |
1042 | m->n_followed ++; |
1043 | ||
1044 | return 0; | |
8fceda93 LP |
1045 | } |
1046 | ||
ac0930c8 | 1047 | static int apply_mount( |
8fceda93 | 1048 | const char *root_directory, |
4e399953 LP |
1049 | MountEntry *m, |
1050 | const NamespaceInfo *ns_info) { | |
ac0930c8 | 1051 | |
e5f10caf | 1052 | _cleanup_free_ char *inaccessible = NULL; |
a227a4be | 1053 | bool rbind = true, make = false; |
15ae422b | 1054 | const char *what; |
15ae422b | 1055 | int r; |
15ae422b | 1056 | |
c17ec25e | 1057 | assert(m); |
4e399953 | 1058 | assert(ns_info); |
15ae422b | 1059 | |
34de407a | 1060 | log_debug("Applying namespace mount on %s", mount_entry_path(m)); |
fe3c2583 | 1061 | |
c17ec25e | 1062 | switch (m->mode) { |
15ae422b | 1063 | |
160cfdbe | 1064 | case INACCESSIBLE: { |
e5f10caf AZ |
1065 | _cleanup_free_ char *tmp = NULL; |
1066 | const char *runtime_dir; | |
160cfdbe | 1067 | struct stat target; |
6d313367 LP |
1068 | |
1069 | /* First, get rid of everything that is below if there | |
1070 | * is anything... Then, overmount it with an | |
c4b41707 | 1071 | * inaccessible path. */ |
34de407a | 1072 | (void) umount_recursive(mount_entry_path(m), 0); |
6d313367 | 1073 | |
088696fe LP |
1074 | if (lstat(mount_entry_path(m), &target) < 0) { |
1075 | if (errno == ENOENT && m->ignore) | |
1076 | return 0; | |
1077 | ||
cbc056c8 ZJS |
1078 | return log_debug_errno(errno, "Failed to lstat() %s to determine what to mount over it: %m", |
1079 | mount_entry_path(m)); | |
088696fe | 1080 | } |
15ae422b | 1081 | |
e5f10caf | 1082 | if (geteuid() == 0) |
48b747fa | 1083 | runtime_dir = "/run"; |
e5f10caf | 1084 | else { |
48b747fa LP |
1085 | if (asprintf(&tmp, "/run/user/" UID_FMT, geteuid()) < 0) |
1086 | return -ENOMEM; | |
e5f10caf AZ |
1087 | |
1088 | runtime_dir = tmp; | |
1089 | } | |
1090 | ||
1091 | r = mode_to_inaccessible_node(runtime_dir, target.st_mode, &inaccessible); | |
1092 | if (r < 0) | |
baaa35ad ZJS |
1093 | return log_debug_errno(SYNTHETIC_ERRNO(ELOOP), |
1094 | "File type not supported for inaccessible mounts. Note that symlinks are not allowed"); | |
e5f10caf | 1095 | what = inaccessible; |
c4b41707 | 1096 | break; |
160cfdbe | 1097 | } |
fe3c2583 | 1098 | |
15ae422b | 1099 | case READONLY: |
15ae422b | 1100 | case READWRITE: |
1e05071d | 1101 | case READWRITE_IMPLICIT: |
8fceda93 | 1102 | r = path_is_mount_point(mount_entry_path(m), root_directory, 0); |
088696fe LP |
1103 | if (r == -ENOENT && m->ignore) |
1104 | return 0; | |
d944dc95 | 1105 | if (r < 0) |
cbc056c8 ZJS |
1106 | return log_debug_errno(r, "Failed to determine whether %s is already a mount point: %m", |
1107 | mount_entry_path(m)); | |
1108 | if (r > 0) /* Nothing to do here, it is already a mount. We just later toggle the MS_RDONLY | |
1109 | * bit for the mount point if needed. */ | |
6b7c9f8b | 1110 | return 0; |
6b7c9f8b | 1111 | /* This isn't a mount point yet, let's make it one. */ |
34de407a | 1112 | what = mount_entry_path(m); |
6b7c9f8b | 1113 | break; |
15ae422b | 1114 | |
d2d6c096 LP |
1115 | case BIND_MOUNT: |
1116 | rbind = false; | |
d2d6c096 | 1117 | |
4831981d | 1118 | _fallthrough_; |
088696fe LP |
1119 | case BIND_MOUNT_RECURSIVE: { |
1120 | _cleanup_free_ char *chased = NULL; | |
5d997827 | 1121 | |
cbc056c8 ZJS |
1122 | /* Since mount() will always follow symlinks we chase the symlinks on our own first. Note |
1123 | * that bind mount source paths are always relative to the host root, hence we pass NULL as | |
1124 | * root directory to chase_symlinks() here. */ | |
088696fe | 1125 | |
a5648b80 | 1126 | r = chase_symlinks(mount_entry_source(m), NULL, CHASE_TRAIL_SLASH, &chased, NULL); |
088696fe LP |
1127 | if (r == -ENOENT && m->ignore) { |
1128 | log_debug_errno(r, "Path %s does not exist, ignoring.", mount_entry_source(m)); | |
1129 | return 0; | |
1130 | } | |
1131 | if (r < 0) | |
1132 | return log_debug_errno(r, "Failed to follow symlinks on %s: %m", mount_entry_source(m)); | |
1133 | ||
1134 | log_debug("Followed source symlinks %s → %s.", mount_entry_source(m), chased); | |
1135 | ||
1136 | free_and_replace(m->source_malloc, chased); | |
d2d6c096 LP |
1137 | |
1138 | what = mount_entry_source(m); | |
a227a4be | 1139 | make = true; |
d2d6c096 | 1140 | break; |
088696fe | 1141 | } |
d2d6c096 | 1142 | |
6c47cd7d | 1143 | case EMPTY_DIR: |
2abd4e38 YW |
1144 | case TMPFS: |
1145 | return mount_tmpfs(m); | |
6c47cd7d | 1146 | |
ac0930c8 | 1147 | case PRIVATE_TMP: |
56a13a49 | 1148 | case PRIVATE_TMP_READONLY: |
89bd586c | 1149 | what = mount_entry_source(m); |
a227a4be | 1150 | make = true; |
15ae422b | 1151 | break; |
e364ad06 | 1152 | |
d6797c92 | 1153 | case PRIVATE_DEV: |
5d997827 LP |
1154 | return mount_private_dev(m); |
1155 | ||
1156 | case BIND_DEV: | |
1157 | return mount_bind_dev(m); | |
1158 | ||
1159 | case SYSFS: | |
1160 | return mount_sysfs(m); | |
1161 | ||
1162 | case PROCFS: | |
4e399953 | 1163 | return mount_procfs(m, ns_info); |
d6797c92 | 1164 | |
b3d13314 LB |
1165 | case MOUNT_IMAGES: |
1166 | return mount_images(m); | |
1167 | ||
e364ad06 LP |
1168 | default: |
1169 | assert_not_reached("Unknown mode"); | |
15ae422b LP |
1170 | } |
1171 | ||
ac0930c8 | 1172 | assert(what); |
15ae422b | 1173 | |
21935150 LP |
1174 | r = mount_nofollow_verbose(LOG_DEBUG, what, mount_entry_path(m), NULL, MS_BIND|(rbind ? MS_REC : 0), NULL); |
1175 | if (r < 0) { | |
a227a4be | 1176 | bool try_again = false; |
a227a4be LP |
1177 | |
1178 | if (r == -ENOENT && make) { | |
1179 | struct stat st; | |
1180 | ||
cbc056c8 ZJS |
1181 | /* Hmm, either the source or the destination are missing. Let's see if we can create |
1182 | the destination, then try again. */ | |
a227a4be | 1183 | |
e8717862 | 1184 | if (stat(what, &st) < 0) |
5dc60faa | 1185 | log_error_errno(errno, "Mount point source '%s' is not accessible: %m", what); |
e8717862 LP |
1186 | else { |
1187 | int q; | |
a227a4be LP |
1188 | |
1189 | (void) mkdir_parents(mount_entry_path(m), 0755); | |
1190 | ||
1191 | if (S_ISDIR(st.st_mode)) | |
e8717862 | 1192 | q = mkdir(mount_entry_path(m), 0755) < 0 ? -errno : 0; |
a227a4be | 1193 | else |
e8717862 LP |
1194 | q = touch(mount_entry_path(m)); |
1195 | ||
1196 | if (q < 0) | |
cbc056c8 ZJS |
1197 | log_error_errno(q, "Failed to create destination mount point node '%s': %m", |
1198 | mount_entry_path(m)); | |
e8717862 LP |
1199 | else |
1200 | try_again = true; | |
a227a4be LP |
1201 | } |
1202 | } | |
1203 | ||
21935150 LP |
1204 | if (try_again) |
1205 | r = mount_nofollow_verbose(LOG_DEBUG, what, mount_entry_path(m), NULL, MS_BIND|(rbind ? MS_REC : 0), NULL); | |
a227a4be | 1206 | if (r < 0) |
5dc60faa | 1207 | return log_error_errno(r, "Failed to mount %s to %s: %m", what, mount_entry_path(m)); |
a227a4be | 1208 | } |
6b7c9f8b | 1209 | |
34de407a | 1210 | log_debug("Successfully mounted %s to %s", what, mount_entry_path(m)); |
6b7c9f8b | 1211 | return 0; |
ac0930c8 | 1212 | } |
15ae422b | 1213 | |
6b000af4 | 1214 | static int make_read_only(const MountEntry *m, char **deny_list, FILE *proc_self_mountinfo) { |
9ce4e4b0 | 1215 | unsigned long new_flags = 0, flags_mask = 0; |
763a260a | 1216 | bool submounts = false; |
6b7c9f8b | 1217 | int r = 0; |
15ae422b | 1218 | |
c17ec25e | 1219 | assert(m); |
ac9de0b3 | 1220 | assert(proc_self_mountinfo); |
ac0930c8 | 1221 | |
9ce4e4b0 LP |
1222 | if (mount_entry_read_only(m) || m->mode == PRIVATE_DEV) { |
1223 | new_flags |= MS_RDONLY; | |
1224 | flags_mask |= MS_RDONLY; | |
1225 | } | |
1226 | ||
1227 | if (m->nosuid) { | |
1228 | new_flags |= MS_NOSUID; | |
1229 | flags_mask |= MS_NOSUID; | |
1230 | } | |
1231 | ||
1232 | if (flags_mask == 0) /* No Change? */ | |
6b7c9f8b LP |
1233 | return 0; |
1234 | ||
9ce4e4b0 LP |
1235 | /* We generally apply these changes recursively, except for /dev, and the cases we know there's |
1236 | * nothing further down. Set /dev readonly, but not submounts like /dev/shm. Also, we only set the | |
1237 | * per-mount read-only flag. We can't set it on the superblock, if we are inside a user namespace | |
1238 | * and running Linux <= 4.17. */ | |
1239 | submounts = | |
1240 | mount_entry_read_only(m) && | |
1241 | !IN_SET(m->mode, EMPTY_DIR, TMPFS); | |
1242 | if (submounts) | |
6b000af4 | 1243 | r = bind_remount_recursive_with_mountinfo(mount_entry_path(m), new_flags, flags_mask, deny_list, proc_self_mountinfo); |
9ce4e4b0 | 1244 | else |
7cce68e1 | 1245 | r = bind_remount_one_with_mountinfo(mount_entry_path(m), new_flags, flags_mask, proc_self_mountinfo); |
9ce4e4b0 | 1246 | |
867189b5 LP |
1247 | /* Not that we only turn on the MS_RDONLY flag here, we never turn it off. Something that was marked |
1248 | * read-only already stays this way. This improves compatibility with container managers, where we | |
1249 | * won't attempt to undo read-only mounts already applied. */ | |
ac0930c8 | 1250 | |
8fceda93 | 1251 | if (r == -ENOENT && m->ignore) |
867189b5 | 1252 | return 0; |
763a260a | 1253 | if (r < 0) |
9ce4e4b0 | 1254 | return log_debug_errno(r, "Failed to re-mount '%s'%s: %m", mount_entry_path(m), |
763a260a | 1255 | submounts ? " and its submounts" : ""); |
763a260a | 1256 | return 0; |
d944dc95 LP |
1257 | } |
1258 | ||
9b68367b | 1259 | static bool namespace_info_mount_apivfs(const NamespaceInfo *ns_info) { |
5d997827 LP |
1260 | assert(ns_info); |
1261 | ||
9c988f93 DH |
1262 | /* |
1263 | * ProtectControlGroups= and ProtectKernelTunables= imply MountAPIVFS=, | |
1264 | * since to protect the API VFS mounts, they need to be around in the | |
9b68367b | 1265 | * first place... |
9c988f93 | 1266 | */ |
5d997827 | 1267 | |
9b68367b YW |
1268 | return ns_info->mount_apivfs || |
1269 | ns_info->protect_control_groups || | |
4e399953 LP |
1270 | ns_info->protect_kernel_tunables || |
1271 | ns_info->protect_proc != PROTECT_PROC_DEFAULT || | |
1272 | ns_info->proc_subset != PROC_SUBSET_ALL; | |
5d997827 LP |
1273 | } |
1274 | ||
da6053d0 | 1275 | static size_t namespace_calculate_mounts( |
bb0ff3fb | 1276 | const NamespaceInfo *ns_info, |
2652c6c1 DH |
1277 | char** read_write_paths, |
1278 | char** read_only_paths, | |
1279 | char** inaccessible_paths, | |
6c47cd7d | 1280 | char** empty_directories, |
da6053d0 LP |
1281 | size_t n_bind_mounts, |
1282 | size_t n_temporary_filesystems, | |
b3d13314 | 1283 | size_t n_mount_images, |
2652c6c1 DH |
1284 | const char* tmp_dir, |
1285 | const char* var_tmp_dir, | |
bbb4e7f3 | 1286 | const char *creds_path, |
52b3d652 | 1287 | const char* log_namespace) { |
2652c6c1 | 1288 | |
da6053d0 LP |
1289 | size_t protect_home_cnt; |
1290 | size_t protect_system_cnt = | |
52b3d652 | 1291 | (ns_info->protect_system == PROTECT_SYSTEM_STRICT ? |
f471b2af | 1292 | ELEMENTSOF(protect_system_strict_table) : |
52b3d652 | 1293 | ((ns_info->protect_system == PROTECT_SYSTEM_FULL) ? |
f471b2af | 1294 | ELEMENTSOF(protect_system_full_table) : |
52b3d652 | 1295 | ((ns_info->protect_system == PROTECT_SYSTEM_YES) ? |
f471b2af DH |
1296 | ELEMENTSOF(protect_system_yes_table) : 0))); |
1297 | ||
b6c432ca | 1298 | protect_home_cnt = |
52b3d652 | 1299 | (ns_info->protect_home == PROTECT_HOME_YES ? |
b6c432ca | 1300 | ELEMENTSOF(protect_home_yes_table) : |
52b3d652 | 1301 | ((ns_info->protect_home == PROTECT_HOME_READ_ONLY) ? |
e4da7d8c | 1302 | ELEMENTSOF(protect_home_read_only_table) : |
52b3d652 | 1303 | ((ns_info->protect_home == PROTECT_HOME_TMPFS) ? |
e4da7d8c | 1304 | ELEMENTSOF(protect_home_tmpfs_table) : 0))); |
b6c432ca | 1305 | |
2652c6c1 DH |
1306 | return !!tmp_dir + !!var_tmp_dir + |
1307 | strv_length(read_write_paths) + | |
1308 | strv_length(read_only_paths) + | |
1309 | strv_length(inaccessible_paths) + | |
6c47cd7d | 1310 | strv_length(empty_directories) + |
d2d6c096 | 1311 | n_bind_mounts + |
b3d13314 | 1312 | n_mount_images + |
2abd4e38 | 1313 | n_temporary_filesystems + |
c575770b DH |
1314 | ns_info->private_dev + |
1315 | (ns_info->protect_kernel_tunables ? ELEMENTSOF(protect_kernel_tunables_table) : 0) + | |
c575770b | 1316 | (ns_info->protect_kernel_modules ? ELEMENTSOF(protect_kernel_modules_table) : 0) + |
94a7b275 KK |
1317 | (ns_info->protect_kernel_logs ? ELEMENTSOF(protect_kernel_logs_table) : 0) + |
1318 | (ns_info->protect_control_groups ? 1 : 0) + | |
5d997827 | 1319 | protect_home_cnt + protect_system_cnt + |
aecd5ac6 | 1320 | (ns_info->protect_hostname ? 2 : 0) + |
91dd5f7c | 1321 | (namespace_info_mount_apivfs(ns_info) ? ELEMENTSOF(apivfs_table) : 0) + |
bbb4e7f3 | 1322 | (creds_path ? 2 : 1) + |
91dd5f7c | 1323 | !!log_namespace; |
2652c6c1 DH |
1324 | } |
1325 | ||
da6053d0 | 1326 | static void normalize_mounts(const char *root_directory, MountEntry *mounts, size_t *n_mounts) { |
9b68367b | 1327 | assert(root_directory); |
f8b64b57 LP |
1328 | assert(n_mounts); |
1329 | assert(mounts || *n_mounts == 0); | |
1330 | ||
93bab288 | 1331 | typesafe_qsort(mounts, *n_mounts, mount_path_compare); |
f8b64b57 LP |
1332 | |
1333 | drop_duplicates(mounts, n_mounts); | |
1334 | drop_outside_root(root_directory, mounts, n_mounts); | |
1335 | drop_inaccessible(mounts, n_mounts); | |
1336 | drop_nop(mounts, n_mounts); | |
1337 | } | |
1338 | ||
c8c535d5 LP |
1339 | static bool root_read_only( |
1340 | char **read_only_paths, | |
1341 | ProtectSystem protect_system) { | |
1342 | ||
1343 | /* Determine whether the root directory is going to be read-only given the configured settings. */ | |
1344 | ||
1345 | if (protect_system == PROTECT_SYSTEM_STRICT) | |
1346 | return true; | |
1347 | ||
de46b2be | 1348 | if (prefixed_path_strv_contains(read_only_paths, "/")) |
c8c535d5 LP |
1349 | return true; |
1350 | ||
1351 | return false; | |
1352 | } | |
1353 | ||
1354 | static bool home_read_only( | |
1355 | char** read_only_paths, | |
1356 | char** inaccessible_paths, | |
1357 | char** empty_directories, | |
1358 | const BindMount *bind_mounts, | |
1359 | size_t n_bind_mounts, | |
1360 | const TemporaryFileSystem *temporary_filesystems, | |
1361 | size_t n_temporary_filesystems, | |
1362 | ProtectHome protect_home) { | |
1363 | ||
1364 | size_t i; | |
1365 | ||
1366 | /* Determine whether the /home directory is going to be read-only given the configured settings. Yes, | |
1367 | * this is a bit sloppy, since we don't bother checking for cases where / is affected by multiple | |
1368 | * settings. */ | |
1369 | ||
1370 | if (protect_home != PROTECT_HOME_NO) | |
1371 | return true; | |
1372 | ||
de46b2be TM |
1373 | if (prefixed_path_strv_contains(read_only_paths, "/home") || |
1374 | prefixed_path_strv_contains(inaccessible_paths, "/home") || | |
1375 | prefixed_path_strv_contains(empty_directories, "/home")) | |
c8c535d5 LP |
1376 | return true; |
1377 | ||
1378 | for (i = 0; i < n_temporary_filesystems; i++) | |
1379 | if (path_equal(temporary_filesystems[i].path, "/home")) | |
1380 | return true; | |
1381 | ||
1382 | /* If /home is overmounted with some dir from the host it's not writable. */ | |
1383 | for (i = 0; i < n_bind_mounts; i++) | |
1384 | if (path_equal(bind_mounts[i].destination, "/home")) | |
1385 | return true; | |
1386 | ||
1387 | return false; | |
1388 | } | |
1389 | ||
89e62e0b LP |
1390 | static int verity_settings_prepare( |
1391 | VeritySettings *verity, | |
1392 | const char *root_image, | |
1393 | const void *root_hash, | |
1394 | size_t root_hash_size, | |
1395 | const char *root_hash_path, | |
1396 | const void *root_hash_sig, | |
1397 | size_t root_hash_sig_size, | |
1398 | const char *root_hash_sig_path, | |
1399 | const char *verity_data_path) { | |
1400 | ||
1401 | int r; | |
1402 | ||
1403 | assert(verity); | |
1404 | ||
1405 | if (root_hash) { | |
1406 | void *d; | |
1407 | ||
1408 | d = memdup(root_hash, root_hash_size); | |
1409 | if (!d) | |
1410 | return -ENOMEM; | |
1411 | ||
1412 | free_and_replace(verity->root_hash, d); | |
1413 | verity->root_hash_size = root_hash_size; | |
aee36b4e | 1414 | verity->designator = PARTITION_ROOT; |
89e62e0b LP |
1415 | } |
1416 | ||
1417 | if (root_hash_sig) { | |
1418 | void *d; | |
1419 | ||
1420 | d = memdup(root_hash_sig, root_hash_sig_size); | |
1421 | if (!d) | |
1422 | return -ENOMEM; | |
1423 | ||
1424 | free_and_replace(verity->root_hash_sig, d); | |
1425 | verity->root_hash_sig_size = root_hash_sig_size; | |
aee36b4e | 1426 | verity->designator = PARTITION_ROOT; |
89e62e0b LP |
1427 | } |
1428 | ||
1429 | if (verity_data_path) { | |
1430 | r = free_and_strdup(&verity->data_path, verity_data_path); | |
1431 | if (r < 0) | |
1432 | return r; | |
1433 | } | |
1434 | ||
1435 | r = verity_settings_load( | |
1436 | verity, | |
1437 | root_image, | |
1438 | root_hash_path, | |
1439 | root_hash_sig_path); | |
1440 | if (r < 0) | |
1441 | return log_debug_errno(r, "Failed to load root hash: %m"); | |
1442 | ||
1443 | return 0; | |
1444 | } | |
1445 | ||
613b411c | 1446 | int setup_namespace( |
ee818b89 | 1447 | const char* root_directory, |
915e6d16 | 1448 | const char* root_image, |
18d73705 | 1449 | const MountOptions *root_image_options, |
bb0ff3fb | 1450 | const NamespaceInfo *ns_info, |
2a624c36 AP |
1451 | char** read_write_paths, |
1452 | char** read_only_paths, | |
1453 | char** inaccessible_paths, | |
6c47cd7d | 1454 | char** empty_directories, |
d2d6c096 | 1455 | const BindMount *bind_mounts, |
da6053d0 | 1456 | size_t n_bind_mounts, |
2abd4e38 | 1457 | const TemporaryFileSystem *temporary_filesystems, |
da6053d0 | 1458 | size_t n_temporary_filesystems, |
b3d13314 LB |
1459 | const MountImage *mount_images, |
1460 | size_t n_mount_images, | |
a004cb4c LP |
1461 | const char* tmp_dir, |
1462 | const char* var_tmp_dir, | |
bbb4e7f3 | 1463 | const char *creds_path, |
91dd5f7c | 1464 | const char *log_namespace, |
915e6d16 | 1465 | unsigned long mount_flags, |
0389f4fa LB |
1466 | const void *root_hash, |
1467 | size_t root_hash_size, | |
1468 | const char *root_hash_path, | |
d4d55b0d LB |
1469 | const void *root_hash_sig, |
1470 | size_t root_hash_sig_size, | |
1471 | const char *root_hash_sig_path, | |
89e62e0b | 1472 | const char *verity_data_path, |
7cc5ef5f ZJS |
1473 | DissectImageFlags dissect_image_flags, |
1474 | char **error_path) { | |
15ae422b | 1475 | |
915e6d16 | 1476 | _cleanup_(loop_device_unrefp) LoopDevice *loop_device = NULL; |
78ebe980 | 1477 | _cleanup_(decrypted_image_unrefp) DecryptedImage *decrypted_image = NULL; |
915e6d16 | 1478 | _cleanup_(dissected_image_unrefp) DissectedImage *dissected_image = NULL; |
aee36b4e | 1479 | _cleanup_(verity_settings_done) VeritySettings verity = VERITY_SETTINGS_DEFAULT; |
5f7a690a | 1480 | MountEntry *m = NULL, *mounts = NULL; |
d18aff04 | 1481 | bool require_prefix = false; |
9b68367b | 1482 | const char *root; |
89e62e0b LP |
1483 | size_t n_mounts; |
1484 | int r; | |
15ae422b | 1485 | |
915e6d16 LP |
1486 | assert(ns_info); |
1487 | ||
613b411c | 1488 | if (mount_flags == 0) |
c17ec25e | 1489 | mount_flags = MS_SHARED; |
ac0930c8 | 1490 | |
915e6d16 LP |
1491 | if (root_image) { |
1492 | dissect_image_flags |= DISSECT_IMAGE_REQUIRE_ROOT; | |
1493 | ||
c8c535d5 LP |
1494 | /* Make the whole image read-only if we can determine that we only access it in a read-only fashion. */ |
1495 | if (root_read_only(read_only_paths, | |
52b3d652 | 1496 | ns_info->protect_system) && |
c8c535d5 LP |
1497 | home_read_only(read_only_paths, inaccessible_paths, empty_directories, |
1498 | bind_mounts, n_bind_mounts, temporary_filesystems, n_temporary_filesystems, | |
52b3d652 | 1499 | ns_info->protect_home) && |
c9ef8573 | 1500 | strv_isempty(read_write_paths)) |
915e6d16 LP |
1501 | dissect_image_flags |= DISSECT_IMAGE_READ_ONLY; |
1502 | ||
89e62e0b LP |
1503 | r = verity_settings_prepare( |
1504 | &verity, | |
1505 | root_image, | |
1506 | root_hash, root_hash_size, root_hash_path, | |
1507 | root_hash_sig, root_hash_sig_size, root_hash_sig_path, | |
1508 | verity_data_path); | |
915e6d16 | 1509 | if (r < 0) |
89e62e0b LP |
1510 | return r; |
1511 | ||
1512 | SET_FLAG(dissect_image_flags, DISSECT_IMAGE_NO_PARTITION_TABLE, verity.data_path); | |
915e6d16 | 1513 | |
89e62e0b LP |
1514 | r = loop_device_make_by_path( |
1515 | root_image, | |
1516 | FLAGS_SET(dissect_image_flags, DISSECT_IMAGE_READ_ONLY) ? O_RDONLY : -1 /* < 0 means writable if possible, read-only as fallback */, | |
1517 | FLAGS_SET(dissect_image_flags, DISSECT_IMAGE_NO_PARTITION_TABLE) ? 0 : LO_FLAGS_PARTSCAN, | |
1518 | &loop_device); | |
78ebe980 | 1519 | if (r < 0) |
89e62e0b LP |
1520 | return log_debug_errno(r, "Failed to create loop device for root image: %m"); |
1521 | ||
1522 | r = dissect_image( | |
1523 | loop_device->fd, | |
1524 | &verity, | |
1525 | root_image_options, | |
1526 | dissect_image_flags, | |
1527 | &dissected_image); | |
78ebe980 | 1528 | if (r < 0) |
763a260a | 1529 | return log_debug_errno(r, "Failed to dissect image: %m"); |
78ebe980 | 1530 | |
89e62e0b LP |
1531 | r = dissected_image_decrypt( |
1532 | dissected_image, | |
1533 | NULL, | |
1534 | &verity, | |
1535 | dissect_image_flags, | |
1536 | &decrypted_image); | |
915e6d16 | 1537 | if (r < 0) |
763a260a | 1538 | return log_debug_errno(r, "Failed to decrypt dissected image: %m"); |
915e6d16 LP |
1539 | } |
1540 | ||
e908468b LP |
1541 | if (root_directory) |
1542 | root = root_directory; | |
0722b359 JS |
1543 | else { |
1544 | /* Always create the mount namespace in a temporary directory, instead of operating | |
1545 | * directly in the root. The temporary directory prevents any mounts from being | |
1546 | * potentially obscured my other mounts we already applied. | |
1547 | * We use the same mount point for all images, which is safe, since they all live | |
1548 | * in their own namespaces after all, and hence won't see each other. */ | |
e908468b LP |
1549 | |
1550 | root = "/run/systemd/unit-root"; | |
1551 | (void) mkdir_label(root, 0700); | |
d18aff04 | 1552 | require_prefix = true; |
0722b359 | 1553 | } |
e908468b | 1554 | |
cfbeb4ef LP |
1555 | n_mounts = namespace_calculate_mounts( |
1556 | ns_info, | |
1557 | read_write_paths, | |
1558 | read_only_paths, | |
1559 | inaccessible_paths, | |
6c47cd7d | 1560 | empty_directories, |
f5c52a77 | 1561 | n_bind_mounts, |
2abd4e38 | 1562 | n_temporary_filesystems, |
b3d13314 | 1563 | n_mount_images, |
cfbeb4ef | 1564 | tmp_dir, var_tmp_dir, |
bbb4e7f3 | 1565 | creds_path, |
52b3d652 | 1566 | log_namespace); |
613b411c | 1567 | |
f0a4feb0 | 1568 | if (n_mounts > 0) { |
5f7a690a LP |
1569 | m = mounts = new0(MountEntry, n_mounts); |
1570 | if (!mounts) | |
1571 | return -ENOMEM; | |
1572 | ||
d18aff04 | 1573 | r = append_access_mounts(&m, read_write_paths, READWRITE, require_prefix); |
613b411c | 1574 | if (r < 0) |
f0a4feb0 | 1575 | goto finish; |
613b411c | 1576 | |
d18aff04 | 1577 | r = append_access_mounts(&m, read_only_paths, READONLY, require_prefix); |
613b411c | 1578 | if (r < 0) |
f0a4feb0 | 1579 | goto finish; |
613b411c | 1580 | |
d18aff04 | 1581 | r = append_access_mounts(&m, inaccessible_paths, INACCESSIBLE, require_prefix); |
613b411c | 1582 | if (r < 0) |
f0a4feb0 | 1583 | goto finish; |
7ff7394d | 1584 | |
6c47cd7d LP |
1585 | r = append_empty_dir_mounts(&m, empty_directories); |
1586 | if (r < 0) | |
1587 | goto finish; | |
1588 | ||
d2d6c096 LP |
1589 | r = append_bind_mounts(&m, bind_mounts, n_bind_mounts); |
1590 | if (r < 0) | |
1591 | goto finish; | |
1592 | ||
2abd4e38 YW |
1593 | r = append_tmpfs_mounts(&m, temporary_filesystems, n_temporary_filesystems); |
1594 | if (r < 0) | |
1595 | goto finish; | |
1596 | ||
613b411c | 1597 | if (tmp_dir) { |
56a13a49 ZJS |
1598 | bool ro = streq(tmp_dir, RUN_SYSTEMD_EMPTY); |
1599 | ||
34de407a | 1600 | *(m++) = (MountEntry) { |
5327c910 | 1601 | .path_const = "/tmp", |
56a13a49 | 1602 | .mode = ro ? PRIVATE_TMP_READONLY : PRIVATE_TMP, |
89bd586c | 1603 | .source_const = tmp_dir, |
5327c910 | 1604 | }; |
613b411c | 1605 | } |
7ff7394d | 1606 | |
613b411c | 1607 | if (var_tmp_dir) { |
56a13a49 ZJS |
1608 | bool ro = streq(var_tmp_dir, RUN_SYSTEMD_EMPTY); |
1609 | ||
34de407a | 1610 | *(m++) = (MountEntry) { |
5327c910 | 1611 | .path_const = "/var/tmp", |
56a13a49 | 1612 | .mode = ro ? PRIVATE_TMP_READONLY : PRIVATE_TMP, |
89bd586c | 1613 | .source_const = var_tmp_dir, |
5327c910 | 1614 | }; |
7ff7394d | 1615 | } |
ac0930c8 | 1616 | |
b3d13314 LB |
1617 | r = append_mount_images(&m, mount_images, n_mount_images); |
1618 | if (r < 0) | |
1619 | goto finish; | |
1620 | ||
d46b79bb | 1621 | if (ns_info->private_dev) |
34de407a | 1622 | *(m++) = (MountEntry) { |
5327c910 LP |
1623 | .path_const = "/dev", |
1624 | .mode = PRIVATE_DEV, | |
9ce4e4b0 | 1625 | .flags = DEV_MOUNT_OPTIONS, |
5327c910 | 1626 | }; |
7f112f50 | 1627 | |
c575770b | 1628 | if (ns_info->protect_kernel_tunables) { |
cbc056c8 ZJS |
1629 | r = append_static_mounts(&m, |
1630 | protect_kernel_tunables_table, | |
1631 | ELEMENTSOF(protect_kernel_tunables_table), | |
1632 | ns_info->ignore_protect_paths); | |
c575770b | 1633 | if (r < 0) |
f0a4feb0 | 1634 | goto finish; |
c575770b DH |
1635 | } |
1636 | ||
1637 | if (ns_info->protect_kernel_modules) { | |
cbc056c8 ZJS |
1638 | r = append_static_mounts(&m, |
1639 | protect_kernel_modules_table, | |
1640 | ELEMENTSOF(protect_kernel_modules_table), | |
1641 | ns_info->ignore_protect_paths); | |
c575770b | 1642 | if (r < 0) |
f0a4feb0 | 1643 | goto finish; |
c575770b | 1644 | } |
59eeb84b | 1645 | |
94a7b275 | 1646 | if (ns_info->protect_kernel_logs) { |
cbc056c8 ZJS |
1647 | r = append_static_mounts(&m, |
1648 | protect_kernel_logs_table, | |
1649 | ELEMENTSOF(protect_kernel_logs_table), | |
1650 | ns_info->ignore_protect_paths); | |
94a7b275 KK |
1651 | if (r < 0) |
1652 | goto finish; | |
1653 | } | |
1654 | ||
d46b79bb | 1655 | if (ns_info->protect_control_groups) |
34de407a | 1656 | *(m++) = (MountEntry) { |
5327c910 LP |
1657 | .path_const = "/sys/fs/cgroup", |
1658 | .mode = READONLY, | |
1659 | }; | |
59eeb84b | 1660 | |
52b3d652 | 1661 | r = append_protect_home(&m, ns_info->protect_home, ns_info->ignore_protect_paths); |
b6c432ca | 1662 | if (r < 0) |
f0a4feb0 | 1663 | goto finish; |
417116f2 | 1664 | |
52b3d652 | 1665 | r = append_protect_system(&m, ns_info->protect_system, false); |
f471b2af | 1666 | if (r < 0) |
f0a4feb0 | 1667 | goto finish; |
417116f2 | 1668 | |
9b68367b | 1669 | if (namespace_info_mount_apivfs(ns_info)) { |
cbc056c8 ZJS |
1670 | r = append_static_mounts(&m, |
1671 | apivfs_table, | |
1672 | ELEMENTSOF(apivfs_table), | |
1673 | ns_info->ignore_protect_paths); | |
5d997827 LP |
1674 | if (r < 0) |
1675 | goto finish; | |
1676 | } | |
1677 | ||
aecd5ac6 TM |
1678 | if (ns_info->protect_hostname) { |
1679 | *(m++) = (MountEntry) { | |
1680 | .path_const = "/proc/sys/kernel/hostname", | |
1681 | .mode = READONLY, | |
1682 | }; | |
1683 | *(m++) = (MountEntry) { | |
1684 | .path_const = "/proc/sys/kernel/domainname", | |
1685 | .mode = READONLY, | |
1686 | }; | |
1687 | } | |
1688 | ||
bbb4e7f3 LP |
1689 | if (creds_path) { |
1690 | /* If our service has a credentials store configured, then bind that one in, but hide | |
1691 | * everything else. */ | |
1692 | ||
1693 | *(m++) = (MountEntry) { | |
1694 | .path_const = "/run/credentials", | |
1695 | .mode = TMPFS, | |
1696 | .read_only = true, | |
1697 | .options_const = "mode=0755" TMPFS_LIMITS_EMPTY_OR_ALMOST, | |
1698 | .flags = MS_NODEV|MS_STRICTATIME|MS_NOSUID|MS_NOEXEC, | |
1699 | }; | |
1700 | ||
1701 | *(m++) = (MountEntry) { | |
1702 | .path_const = creds_path, | |
1703 | .mode = BIND_MOUNT, | |
1704 | .read_only = true, | |
1705 | .source_const = creds_path, | |
1706 | }; | |
1707 | } else { | |
1708 | /* If our service has no credentials store configured, then make the whole | |
1709 | * credentials tree inaccessible wholesale. */ | |
1710 | ||
1711 | *(m++) = (MountEntry) { | |
1712 | .path_const = "/run/credentials", | |
1713 | .mode = INACCESSIBLE, | |
1714 | .ignore = true, | |
1715 | }; | |
1716 | } | |
1717 | ||
91dd5f7c LP |
1718 | if (log_namespace) { |
1719 | _cleanup_free_ char *q; | |
1720 | ||
1721 | q = strjoin("/run/systemd/journal.", log_namespace); | |
1722 | if (!q) { | |
1723 | r = -ENOMEM; | |
1724 | goto finish; | |
1725 | } | |
1726 | ||
1727 | *(m++) = (MountEntry) { | |
1728 | .path_const = "/run/systemd/journal", | |
1729 | .mode = BIND_MOUNT_RECURSIVE, | |
1730 | .read_only = true, | |
1731 | .source_malloc = TAKE_PTR(q), | |
1732 | }; | |
1733 | } | |
1734 | ||
f0a4feb0 | 1735 | assert(mounts + n_mounts == m); |
ac0930c8 | 1736 | |
5327c910 | 1737 | /* Prepend the root directory where that's necessary */ |
e908468b | 1738 | r = prefix_where_needed(mounts, n_mounts, root); |
5327c910 LP |
1739 | if (r < 0) |
1740 | goto finish; | |
1741 | ||
839f1877 | 1742 | normalize_mounts(root, mounts, &n_mounts); |
15ae422b LP |
1743 | } |
1744 | ||
1beab8b0 LP |
1745 | /* All above is just preparation, figuring out what to do. Let's now actually start doing something. */ |
1746 | ||
d944dc95 | 1747 | if (unshare(CLONE_NEWNS) < 0) { |
763a260a | 1748 | r = log_debug_errno(errno, "Failed to unshare the mount namespace: %m"); |
1beab8b0 | 1749 | if (IN_SET(r, -EACCES, -EPERM, -EOPNOTSUPP, -ENOSYS)) |
cbc056c8 ZJS |
1750 | /* If the kernel doesn't support namespaces, or when there's a MAC or seccomp filter |
1751 | * in place that doesn't allow us to create namespaces (or a missing cap), then | |
1752 | * propagate a recognizable error back, which the caller can use to detect this case | |
1753 | * (and only this) and optionally continue without namespacing applied. */ | |
1beab8b0 LP |
1754 | r = -ENOANO; |
1755 | ||
d944dc95 LP |
1756 | goto finish; |
1757 | } | |
1e4e94c8 | 1758 | |
9b68367b YW |
1759 | /* Remount / as SLAVE so that nothing now mounted in the namespace |
1760 | * shows up in the parent */ | |
1761 | if (mount(NULL, "/", NULL, MS_SLAVE|MS_REC, NULL) < 0) { | |
763a260a | 1762 | r = log_debug_errno(errno, "Failed to remount '/' as SLAVE: %m"); |
9b68367b | 1763 | goto finish; |
ee818b89 AC |
1764 | } |
1765 | ||
915e6d16 | 1766 | if (root_image) { |
e908468b | 1767 | /* A root image is specified, mount it to the right place */ |
2d3a5a73 | 1768 | r = dissected_image_mount(dissected_image, root, UID_INVALID, dissect_image_flags); |
763a260a YW |
1769 | if (r < 0) { |
1770 | log_debug_errno(r, "Failed to mount root image: %m"); | |
915e6d16 | 1771 | goto finish; |
763a260a | 1772 | } |
915e6d16 | 1773 | |
07ce7407 TM |
1774 | if (decrypted_image) { |
1775 | r = decrypted_image_relinquish(decrypted_image); | |
763a260a YW |
1776 | if (r < 0) { |
1777 | log_debug_errno(r, "Failed to relinquish decrypted image: %m"); | |
07ce7407 | 1778 | goto finish; |
763a260a | 1779 | } |
07ce7407 | 1780 | } |
78ebe980 | 1781 | |
915e6d16 LP |
1782 | loop_device_relinquish(loop_device); |
1783 | ||
1784 | } else if (root_directory) { | |
1785 | ||
e908468b LP |
1786 | /* A root directory is specified. Turn its directory into bind mount, if it isn't one yet. */ |
1787 | r = path_is_mount_point(root, NULL, AT_SYMLINK_FOLLOW); | |
763a260a YW |
1788 | if (r < 0) { |
1789 | log_debug_errno(r, "Failed to detect that %s is a mount point or not: %m", root); | |
d944dc95 | 1790 | goto finish; |
763a260a | 1791 | } |
8f1ad200 | 1792 | if (r == 0) { |
21935150 LP |
1793 | r = mount_nofollow_verbose(LOG_DEBUG, root, root, NULL, MS_BIND|MS_REC, NULL); |
1794 | if (r < 0) | |
8f1ad200 | 1795 | goto finish; |
d944dc95 | 1796 | } |
e908468b | 1797 | |
9b68367b | 1798 | } else { |
e908468b | 1799 | /* Let's mount the main root directory to the root directory to use */ |
21935150 LP |
1800 | r = mount_nofollow_verbose(LOG_DEBUG, "/", root, NULL, MS_BIND|MS_REC, NULL); |
1801 | if (r < 0) | |
e908468b | 1802 | goto finish; |
ee818b89 | 1803 | } |
c2c13f2d | 1804 | |
4e0c20de LP |
1805 | /* Try to set up the new root directory before mounting anything else there. */ |
1806 | if (root_image || root_directory) | |
1807 | (void) base_filesystem_create(root, UID_INVALID, GID_INVALID); | |
1808 | ||
f0a4feb0 | 1809 | if (n_mounts > 0) { |
ac9de0b3 | 1810 | _cleanup_fclose_ FILE *proc_self_mountinfo = NULL; |
6b000af4 | 1811 | _cleanup_free_ char **deny_list = NULL; |
da6053d0 | 1812 | size_t j; |
6b7c9f8b | 1813 | |
cbc056c8 ZJS |
1814 | /* Open /proc/self/mountinfo now as it may become unavailable if we mount anything on top of |
1815 | * /proc. For example, this is the case with the option: 'InaccessiblePaths=/proc'. */ | |
ac9de0b3 TR |
1816 | proc_self_mountinfo = fopen("/proc/self/mountinfo", "re"); |
1817 | if (!proc_self_mountinfo) { | |
763a260a | 1818 | r = log_debug_errno(errno, "Failed to open /proc/self/mountinfo: %m"); |
7cc5ef5f ZJS |
1819 | if (error_path) |
1820 | *error_path = strdup("/proc/self/mountinfo"); | |
ac9de0b3 TR |
1821 | goto finish; |
1822 | } | |
1823 | ||
088696fe LP |
1824 | /* First round, establish all mounts we need */ |
1825 | for (;;) { | |
1826 | bool again = false; | |
1827 | ||
1828 | for (m = mounts; m < mounts + n_mounts; ++m) { | |
1829 | ||
1830 | if (m->applied) | |
1831 | continue; | |
1832 | ||
1833 | r = follow_symlink(root, m); | |
7cc5ef5f ZJS |
1834 | if (r < 0) { |
1835 | if (error_path && mount_entry_path(m)) | |
1836 | *error_path = strdup(mount_entry_path(m)); | |
088696fe | 1837 | goto finish; |
7cc5ef5f | 1838 | } |
088696fe | 1839 | if (r == 0) { |
cbc056c8 ZJS |
1840 | /* We hit a symlinked mount point. The entry got rewritten and might |
1841 | * point to a very different place now. Let's normalize the changed | |
1842 | * list, and start from the beginning. After all to mount the entry | |
1843 | * at the new location we might need some other mounts first */ | |
088696fe LP |
1844 | again = true; |
1845 | break; | |
1846 | } | |
1847 | ||
4e399953 | 1848 | r = apply_mount(root, m, ns_info); |
7cc5ef5f ZJS |
1849 | if (r < 0) { |
1850 | if (error_path && mount_entry_path(m)) | |
1851 | *error_path = strdup(mount_entry_path(m)); | |
088696fe | 1852 | goto finish; |
7cc5ef5f | 1853 | } |
088696fe LP |
1854 | |
1855 | m->applied = true; | |
1856 | } | |
1857 | ||
1858 | if (!again) | |
1859 | break; | |
1860 | ||
839f1877 | 1861 | normalize_mounts(root, mounts, &n_mounts); |
c2c13f2d | 1862 | } |
15ae422b | 1863 | |
6b000af4 LP |
1864 | /* Create a deny list we can pass to bind_mount_recursive() */ |
1865 | deny_list = new(char*, n_mounts+1); | |
1866 | if (!deny_list) { | |
5f7a690a LP |
1867 | r = -ENOMEM; |
1868 | goto finish; | |
1869 | } | |
f0a4feb0 | 1870 | for (j = 0; j < n_mounts; j++) |
6b000af4 LP |
1871 | deny_list[j] = (char*) mount_entry_path(mounts+j); |
1872 | deny_list[j] = NULL; | |
6b7c9f8b LP |
1873 | |
1874 | /* Second round, flip the ro bits if necessary. */ | |
f0a4feb0 | 1875 | for (m = mounts; m < mounts + n_mounts; ++m) { |
6b000af4 | 1876 | r = make_read_only(m, deny_list, proc_self_mountinfo); |
7cc5ef5f ZJS |
1877 | if (r < 0) { |
1878 | if (error_path && mount_entry_path(m)) | |
1879 | *error_path = strdup(mount_entry_path(m)); | |
d944dc95 | 1880 | goto finish; |
7cc5ef5f | 1881 | } |
c2c13f2d | 1882 | } |
15ae422b LP |
1883 | } |
1884 | ||
9b68367b YW |
1885 | /* MS_MOVE does not work on MS_SHARED so the remount MS_SHARED will be done later */ |
1886 | r = mount_move_root(root); | |
763a260a YW |
1887 | if (r < 0) { |
1888 | log_debug_errno(r, "Failed to mount root with MS_MOVE: %m"); | |
9b68367b | 1889 | goto finish; |
763a260a | 1890 | } |
ee818b89 | 1891 | |
55fe7432 | 1892 | /* Remount / as the desired mode. Note that this will not |
c2c13f2d LP |
1893 | * reestablish propagation from our side to the host, since |
1894 | * what's disconnected is disconnected. */ | |
d944dc95 | 1895 | if (mount(NULL, "/", NULL, mount_flags | MS_REC, NULL) < 0) { |
763a260a | 1896 | r = log_debug_errno(errno, "Failed to remount '/' with desired mount flags: %m"); |
d944dc95 LP |
1897 | goto finish; |
1898 | } | |
15ae422b | 1899 | |
d944dc95 | 1900 | r = 0; |
15ae422b | 1901 | |
d944dc95 | 1902 | finish: |
0cd41757 LP |
1903 | if (n_mounts > 0) |
1904 | for (m = mounts; m < mounts + n_mounts; m++) | |
1905 | mount_entry_done(m); | |
613b411c | 1906 | |
5f7a690a LP |
1907 | free(mounts); |
1908 | ||
613b411c LP |
1909 | return r; |
1910 | } | |
1911 | ||
da6053d0 LP |
1912 | void bind_mount_free_many(BindMount *b, size_t n) { |
1913 | size_t i; | |
d2d6c096 LP |
1914 | |
1915 | assert(b || n == 0); | |
1916 | ||
1917 | for (i = 0; i < n; i++) { | |
1918 | free(b[i].source); | |
1919 | free(b[i].destination); | |
1920 | } | |
1921 | ||
1922 | free(b); | |
1923 | } | |
1924 | ||
da6053d0 | 1925 | int bind_mount_add(BindMount **b, size_t *n, const BindMount *item) { |
d2d6c096 LP |
1926 | _cleanup_free_ char *s = NULL, *d = NULL; |
1927 | BindMount *c; | |
1928 | ||
1929 | assert(b); | |
1930 | assert(n); | |
1931 | assert(item); | |
1932 | ||
1933 | s = strdup(item->source); | |
1934 | if (!s) | |
1935 | return -ENOMEM; | |
1936 | ||
1937 | d = strdup(item->destination); | |
1938 | if (!d) | |
1939 | return -ENOMEM; | |
1940 | ||
aa484f35 | 1941 | c = reallocarray(*b, *n + 1, sizeof(BindMount)); |
d2d6c096 LP |
1942 | if (!c) |
1943 | return -ENOMEM; | |
1944 | ||
1945 | *b = c; | |
1946 | ||
1947 | c[(*n) ++] = (BindMount) { | |
1cc6c93a YW |
1948 | .source = TAKE_PTR(s), |
1949 | .destination = TAKE_PTR(d), | |
d2d6c096 | 1950 | .read_only = item->read_only, |
9ce4e4b0 | 1951 | .nosuid = item->nosuid, |
d2d6c096 LP |
1952 | .recursive = item->recursive, |
1953 | .ignore_enoent = item->ignore_enoent, | |
1954 | }; | |
1955 | ||
d2d6c096 LP |
1956 | return 0; |
1957 | } | |
1958 | ||
b3d13314 LB |
1959 | MountImage* mount_image_free_many(MountImage *m, size_t *n) { |
1960 | size_t i; | |
1961 | ||
1962 | assert(n); | |
1963 | assert(m || *n == 0); | |
1964 | ||
1965 | for (i = 0; i < *n; i++) { | |
1966 | free(m[i].source); | |
1967 | free(m[i].destination); | |
427353f6 | 1968 | mount_options_free_all(m[i].mount_options); |
b3d13314 LB |
1969 | } |
1970 | ||
1971 | free(m); | |
1972 | *n = 0; | |
1973 | return NULL; | |
1974 | } | |
1975 | ||
1976 | int mount_image_add(MountImage **m, size_t *n, const MountImage *item) { | |
1977 | _cleanup_free_ char *s = NULL, *d = NULL; | |
427353f6 LB |
1978 | _cleanup_(mount_options_free_allp) MountOptions *options = NULL; |
1979 | MountOptions *i; | |
b3d13314 LB |
1980 | MountImage *c; |
1981 | ||
1982 | assert(m); | |
1983 | assert(n); | |
1984 | assert(item); | |
1985 | ||
1986 | s = strdup(item->source); | |
1987 | if (!s) | |
1988 | return -ENOMEM; | |
1989 | ||
1990 | d = strdup(item->destination); | |
1991 | if (!d) | |
1992 | return -ENOMEM; | |
1993 | ||
427353f6 LB |
1994 | LIST_FOREACH(mount_options, i, item->mount_options) { |
1995 | _cleanup_(mount_options_free_allp) MountOptions *o; | |
1996 | ||
1997 | o = new(MountOptions, 1); | |
1998 | if (!o) | |
1999 | return -ENOMEM; | |
2000 | ||
2001 | *o = (MountOptions) { | |
2002 | .partition_designator = i->partition_designator, | |
2003 | .options = strdup(i->options), | |
2004 | }; | |
2005 | if (!o->options) | |
2006 | return -ENOMEM; | |
2007 | ||
2008 | LIST_APPEND(mount_options, options, TAKE_PTR(o)); | |
2009 | } | |
2010 | ||
b3d13314 LB |
2011 | c = reallocarray(*m, *n + 1, sizeof(MountImage)); |
2012 | if (!c) | |
2013 | return -ENOMEM; | |
2014 | ||
2015 | *m = c; | |
2016 | ||
2017 | c[(*n) ++] = (MountImage) { | |
2018 | .source = TAKE_PTR(s), | |
2019 | .destination = TAKE_PTR(d), | |
427353f6 | 2020 | .mount_options = TAKE_PTR(options), |
b3d13314 LB |
2021 | .ignore_enoent = item->ignore_enoent, |
2022 | }; | |
2023 | ||
2024 | return 0; | |
2025 | } | |
2026 | ||
da6053d0 LP |
2027 | void temporary_filesystem_free_many(TemporaryFileSystem *t, size_t n) { |
2028 | size_t i; | |
2abd4e38 YW |
2029 | |
2030 | assert(t || n == 0); | |
2031 | ||
2032 | for (i = 0; i < n; i++) { | |
2033 | free(t[i].path); | |
2034 | free(t[i].options); | |
2035 | } | |
2036 | ||
2037 | free(t); | |
2038 | } | |
2039 | ||
2040 | int temporary_filesystem_add( | |
2041 | TemporaryFileSystem **t, | |
da6053d0 | 2042 | size_t *n, |
2abd4e38 YW |
2043 | const char *path, |
2044 | const char *options) { | |
2045 | ||
2046 | _cleanup_free_ char *p = NULL, *o = NULL; | |
2047 | TemporaryFileSystem *c; | |
2048 | ||
2049 | assert(t); | |
2050 | assert(n); | |
2051 | assert(path); | |
2052 | ||
2053 | p = strdup(path); | |
2054 | if (!p) | |
2055 | return -ENOMEM; | |
2056 | ||
2057 | if (!isempty(options)) { | |
2058 | o = strdup(options); | |
2059 | if (!o) | |
2060 | return -ENOMEM; | |
2061 | } | |
2062 | ||
aa484f35 | 2063 | c = reallocarray(*t, *n + 1, sizeof(TemporaryFileSystem)); |
2abd4e38 YW |
2064 | if (!c) |
2065 | return -ENOMEM; | |
2066 | ||
2067 | *t = c; | |
2068 | ||
2069 | c[(*n) ++] = (TemporaryFileSystem) { | |
1cc6c93a YW |
2070 | .path = TAKE_PTR(p), |
2071 | .options = TAKE_PTR(o), | |
2abd4e38 YW |
2072 | }; |
2073 | ||
2abd4e38 YW |
2074 | return 0; |
2075 | } | |
2076 | ||
a652f050 JR |
2077 | static int make_tmp_prefix(const char *prefix) { |
2078 | _cleanup_free_ char *t = NULL; | |
2079 | int r; | |
2080 | ||
2081 | /* Don't do anything unless we know the dir is actually missing */ | |
2082 | r = access(prefix, F_OK); | |
2083 | if (r >= 0) | |
2084 | return 0; | |
2085 | if (errno != ENOENT) | |
2086 | return -errno; | |
2087 | ||
2088 | r = mkdir_parents(prefix, 0755); | |
2089 | if (r < 0) | |
2090 | return r; | |
2091 | ||
2092 | r = tempfn_random(prefix, NULL, &t); | |
2093 | if (r < 0) | |
2094 | return r; | |
2095 | ||
2096 | if (mkdir(t, 0777) < 0) | |
2097 | return -errno; | |
2098 | ||
2099 | if (chmod(t, 01777) < 0) { | |
2100 | r = -errno; | |
2101 | (void) rmdir(t); | |
2102 | return r; | |
2103 | } | |
2104 | ||
2105 | if (rename(t, prefix) < 0) { | |
2106 | r = -errno; | |
2107 | (void) rmdir(t); | |
2108 | return r == -EEXIST ? 0 : r; /* it's fine if someone else created the dir by now */ | |
2109 | } | |
2110 | ||
2111 | return 0; | |
2112 | ||
2113 | } | |
2114 | ||
56a13a49 | 2115 | static int setup_one_tmp_dir(const char *id, const char *prefix, char **path, char **tmp_path) { |
613b411c | 2116 | _cleanup_free_ char *x = NULL; |
19cd4e19 | 2117 | _cleanup_free_ char *y = NULL; |
6b46ea73 LP |
2118 | char bid[SD_ID128_STRING_MAX]; |
2119 | sd_id128_t boot_id; | |
56a13a49 | 2120 | bool rw = true; |
6b46ea73 | 2121 | int r; |
613b411c LP |
2122 | |
2123 | assert(id); | |
2124 | assert(prefix); | |
2125 | assert(path); | |
2126 | ||
6b46ea73 LP |
2127 | /* We include the boot id in the directory so that after a |
2128 | * reboot we can easily identify obsolete directories. */ | |
2129 | ||
2130 | r = sd_id128_get_boot(&boot_id); | |
2131 | if (r < 0) | |
2132 | return r; | |
2133 | ||
605405c6 | 2134 | x = strjoin(prefix, "/systemd-private-", sd_id128_to_string(boot_id, bid), "-", id, "-XXXXXX"); |
613b411c LP |
2135 | if (!x) |
2136 | return -ENOMEM; | |
2137 | ||
a652f050 JR |
2138 | r = make_tmp_prefix(prefix); |
2139 | if (r < 0) | |
2140 | return r; | |
2141 | ||
613b411c | 2142 | RUN_WITH_UMASK(0077) |
56a13a49 ZJS |
2143 | if (!mkdtemp(x)) { |
2144 | if (errno == EROFS || ERRNO_IS_DISK_SPACE(errno)) | |
2145 | rw = false; | |
2146 | else | |
2147 | return -errno; | |
2148 | } | |
613b411c | 2149 | |
56a13a49 | 2150 | if (rw) { |
19cd4e19 | 2151 | y = strjoin(x, "/tmp"); |
2152 | if (!y) | |
2153 | return -ENOMEM; | |
2154 | ||
2155 | RUN_WITH_UMASK(0000) { | |
2156 | if (mkdir(y, 0777 | S_ISVTX) < 0) | |
2157 | return -errno; | |
2158 | } | |
2159 | ||
2160 | r = label_fix_container(y, prefix, 0); | |
56a13a49 ZJS |
2161 | if (r < 0) |
2162 | return r; | |
19cd4e19 | 2163 | |
2164 | if (tmp_path) | |
2165 | *tmp_path = TAKE_PTR(y); | |
56a13a49 ZJS |
2166 | } else { |
2167 | /* Trouble: we failed to create the directory. Instead of failing, let's simulate /tmp being | |
2168 | * read-only. This way the service will get the EROFS result as if it was writing to the real | |
2169 | * file system. */ | |
2170 | r = mkdir_p(RUN_SYSTEMD_EMPTY, 0500); | |
2171 | if (r < 0) | |
2172 | return r; | |
613b411c | 2173 | |
3f181262 LP |
2174 | r = free_and_strdup(&x, RUN_SYSTEMD_EMPTY); |
2175 | if (r < 0) | |
2176 | return r; | |
c17ec25e | 2177 | } |
15ae422b | 2178 | |
1cc6c93a | 2179 | *path = TAKE_PTR(x); |
613b411c LP |
2180 | return 0; |
2181 | } | |
2182 | ||
2183 | int setup_tmp_dirs(const char *id, char **tmp_dir, char **var_tmp_dir) { | |
56a13a49 ZJS |
2184 | _cleanup_(namespace_cleanup_tmpdirp) char *a = NULL; |
2185 | _cleanup_(rmdir_and_freep) char *a_tmp = NULL; | |
2186 | char *b; | |
613b411c LP |
2187 | int r; |
2188 | ||
2189 | assert(id); | |
2190 | assert(tmp_dir); | |
2191 | assert(var_tmp_dir); | |
2192 | ||
56a13a49 | 2193 | r = setup_one_tmp_dir(id, "/tmp", &a, &a_tmp); |
613b411c LP |
2194 | if (r < 0) |
2195 | return r; | |
2196 | ||
56a13a49 ZJS |
2197 | r = setup_one_tmp_dir(id, "/var/tmp", &b, NULL); |
2198 | if (r < 0) | |
613b411c | 2199 | return r; |
613b411c | 2200 | |
56a13a49 ZJS |
2201 | a_tmp = mfree(a_tmp); /* avoid rmdir */ |
2202 | *tmp_dir = TAKE_PTR(a); | |
2203 | *var_tmp_dir = TAKE_PTR(b); | |
613b411c LP |
2204 | |
2205 | return 0; | |
2206 | } | |
2207 | ||
2caa38e9 | 2208 | int setup_netns(const int netns_storage_socket[static 2]) { |
613b411c | 2209 | _cleanup_close_ int netns = -1; |
3ee897d6 | 2210 | int r, q; |
613b411c LP |
2211 | |
2212 | assert(netns_storage_socket); | |
2213 | assert(netns_storage_socket[0] >= 0); | |
2214 | assert(netns_storage_socket[1] >= 0); | |
2215 | ||
2216 | /* We use the passed socketpair as a storage buffer for our | |
76cd584b LP |
2217 | * namespace reference fd. Whatever process runs this first |
2218 | * shall create a new namespace, all others should just join | |
2219 | * it. To serialize that we use a file lock on the socket | |
2220 | * pair. | |
613b411c LP |
2221 | * |
2222 | * It's a bit crazy, but hey, works great! */ | |
2223 | ||
2224 | if (lockf(netns_storage_socket[0], F_LOCK, 0) < 0) | |
2225 | return -errno; | |
2226 | ||
3ee897d6 LP |
2227 | netns = receive_one_fd(netns_storage_socket[0], MSG_DONTWAIT); |
2228 | if (netns == -EAGAIN) { | |
44ffcbae | 2229 | /* Nothing stored yet, so let's create a new namespace. */ |
613b411c LP |
2230 | |
2231 | if (unshare(CLONE_NEWNET) < 0) { | |
2232 | r = -errno; | |
2233 | goto fail; | |
2234 | } | |
2235 | ||
44ffcbae | 2236 | (void) loopback_setup(); |
613b411c LP |
2237 | |
2238 | netns = open("/proc/self/ns/net", O_RDONLY|O_CLOEXEC|O_NOCTTY); | |
2239 | if (netns < 0) { | |
2240 | r = -errno; | |
2241 | goto fail; | |
2242 | } | |
2243 | ||
2244 | r = 1; | |
613b411c | 2245 | |
3ee897d6 LP |
2246 | } else if (netns < 0) { |
2247 | r = netns; | |
2248 | goto fail; | |
613b411c | 2249 | |
3ee897d6 LP |
2250 | } else { |
2251 | /* Yay, found something, so let's join the namespace */ | |
613b411c LP |
2252 | if (setns(netns, CLONE_NEWNET) < 0) { |
2253 | r = -errno; | |
2254 | goto fail; | |
2255 | } | |
2256 | ||
2257 | r = 0; | |
2258 | } | |
2259 | ||
3ee897d6 LP |
2260 | q = send_one_fd(netns_storage_socket[1], netns, MSG_DONTWAIT); |
2261 | if (q < 0) { | |
2262 | r = q; | |
613b411c LP |
2263 | goto fail; |
2264 | } | |
2265 | ||
2266 | fail: | |
fe048ce5 | 2267 | (void) lockf(netns_storage_socket[0], F_ULOCK, 0); |
15ae422b LP |
2268 | return r; |
2269 | } | |
417116f2 | 2270 | |
2caa38e9 | 2271 | int open_netns_path(const int netns_storage_socket[static 2], const char *path) { |
51af7fb2 LP |
2272 | _cleanup_close_ int netns = -1; |
2273 | int q, r; | |
2274 | ||
2275 | assert(netns_storage_socket); | |
2276 | assert(netns_storage_socket[0] >= 0); | |
2277 | assert(netns_storage_socket[1] >= 0); | |
2278 | assert(path); | |
2279 | ||
2280 | /* If the storage socket doesn't contain a netns fd yet, open one via the file system and store it in | |
2281 | * it. This is supposed to be called ahead of time, i.e. before setup_netns() which will allocate a | |
2282 | * new anonymous netns if needed. */ | |
2283 | ||
2284 | if (lockf(netns_storage_socket[0], F_LOCK, 0) < 0) | |
2285 | return -errno; | |
2286 | ||
2287 | netns = receive_one_fd(netns_storage_socket[0], MSG_DONTWAIT); | |
2288 | if (netns == -EAGAIN) { | |
2289 | /* Nothing stored yet. Open the file from the file system. */ | |
2290 | ||
2291 | netns = open(path, O_RDONLY|O_NOCTTY|O_CLOEXEC); | |
2292 | if (netns < 0) { | |
2293 | r = -errno; | |
2294 | goto fail; | |
2295 | } | |
2296 | ||
2297 | r = fd_is_network_ns(netns); | |
2298 | if (r == 0) { /* Not a netns? Refuse early. */ | |
2299 | r = -EINVAL; | |
2300 | goto fail; | |
2301 | } | |
2302 | if (r < 0 && r != -EUCLEAN) /* EUCLEAN: we don't know */ | |
2303 | goto fail; | |
2304 | ||
2305 | r = 1; | |
2306 | ||
2307 | } else if (netns < 0) { | |
2308 | r = netns; | |
2309 | goto fail; | |
2310 | } else | |
2311 | r = 0; /* Already allocated */ | |
2312 | ||
2313 | q = send_one_fd(netns_storage_socket[1], netns, MSG_DONTWAIT); | |
2314 | if (q < 0) { | |
2315 | r = q; | |
2316 | goto fail; | |
2317 | } | |
2318 | ||
2319 | fail: | |
2320 | (void) lockf(netns_storage_socket[0], F_ULOCK, 0); | |
2321 | return r; | |
2322 | } | |
2323 | ||
6e2d7c4f MS |
2324 | bool ns_type_supported(NamespaceType type) { |
2325 | const char *t, *ns_proc; | |
2326 | ||
0fa5b831 LP |
2327 | t = namespace_type_to_string(type); |
2328 | if (!t) /* Don't know how to translate this? Then it's not supported */ | |
6e2d7c4f MS |
2329 | return false; |
2330 | ||
6e2d7c4f | 2331 | ns_proc = strjoina("/proc/self/ns/", t); |
6e2d7c4f MS |
2332 | return access(ns_proc, F_OK) == 0; |
2333 | } | |
2334 | ||
1b8689f9 | 2335 | static const char *const protect_home_table[_PROTECT_HOME_MAX] = { |
cbc056c8 ZJS |
2336 | [PROTECT_HOME_NO] = "no", |
2337 | [PROTECT_HOME_YES] = "yes", | |
1b8689f9 | 2338 | [PROTECT_HOME_READ_ONLY] = "read-only", |
cbc056c8 | 2339 | [PROTECT_HOME_TMPFS] = "tmpfs", |
417116f2 LP |
2340 | }; |
2341 | ||
1e8c7bd5 | 2342 | DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(protect_home, ProtectHome, PROTECT_HOME_YES); |
5e1c6154 | 2343 | |
1b8689f9 | 2344 | static const char *const protect_system_table[_PROTECT_SYSTEM_MAX] = { |
cbc056c8 ZJS |
2345 | [PROTECT_SYSTEM_NO] = "no", |
2346 | [PROTECT_SYSTEM_YES] = "yes", | |
2347 | [PROTECT_SYSTEM_FULL] = "full", | |
3f815163 | 2348 | [PROTECT_SYSTEM_STRICT] = "strict", |
1b8689f9 LP |
2349 | }; |
2350 | ||
1e8c7bd5 | 2351 | DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(protect_system, ProtectSystem, PROTECT_SYSTEM_YES); |
03c791aa | 2352 | |
6e2d7c4f | 2353 | static const char* const namespace_type_table[] = { |
cbc056c8 | 2354 | [NAMESPACE_MOUNT] = "mnt", |
6e2d7c4f | 2355 | [NAMESPACE_CGROUP] = "cgroup", |
cbc056c8 ZJS |
2356 | [NAMESPACE_UTS] = "uts", |
2357 | [NAMESPACE_IPC] = "ipc", | |
2358 | [NAMESPACE_USER] = "user", | |
2359 | [NAMESPACE_PID] = "pid", | |
2360 | [NAMESPACE_NET] = "net", | |
6e2d7c4f MS |
2361 | }; |
2362 | ||
2363 | DEFINE_STRING_TABLE_LOOKUP(namespace_type, NamespaceType); | |
4e399953 LP |
2364 | |
2365 | static const char* const protect_proc_table[_PROTECT_PROC_MAX] = { | |
2366 | [PROTECT_PROC_DEFAULT] = "default", | |
2367 | [PROTECT_PROC_NOACCESS] = "noaccess", | |
2368 | [PROTECT_PROC_INVISIBLE] = "invisible", | |
2369 | [PROTECT_PROC_PTRACEABLE] = "ptraceable", | |
2370 | }; | |
2371 | ||
2372 | DEFINE_STRING_TABLE_LOOKUP(protect_proc, ProtectProc); | |
2373 | ||
2374 | static const char* const proc_subset_table[_PROC_SUBSET_MAX] = { | |
2375 | [PROC_SUBSET_ALL] = "all", | |
2376 | [PROC_SUBSET_PID] = "pid", | |
2377 | }; | |
2378 | ||
2379 | DEFINE_STRING_TABLE_LOOKUP(proc_subset, ProcSubset); |