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Commit | Line | Data |
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576f946d | 1 | /* |
2 | * lxc: linux Container library | |
3 | * | |
4 | * (C) Copyright IBM Corp. 2007, 2008 | |
5 | * | |
6 | * Authors: | |
9afe19d6 | 7 | * Daniel Lezcano <daniel.lezcano at free.fr> |
576f946d | 8 | * |
9 | * This library is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * This library is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with this library; if not, write to the Free Software | |
250b1eec | 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
576f946d | 22 | */ |
d06245b8 NC |
23 | #include "config.h" |
24 | ||
576f946d | 25 | #include <stdio.h> |
576f946d | 26 | #include <stdlib.h> |
27 | #include <errno.h> | |
576f946d | 28 | #include <unistd.h> |
29 | #include <string.h> | |
341a9bd8 | 30 | #include <dirent.h> |
576f946d | 31 | #include <fcntl.h> |
8b276860 | 32 | #include <grp.h> |
b98f7d6e | 33 | #include <ctype.h> |
576f946d | 34 | #include <sys/types.h> |
35 | #include <sys/stat.h> | |
36 | #include <sys/param.h> | |
37 | #include <sys/inotify.h> | |
aae1f3c4 | 38 | #include <sys/mount.h> |
576f946d | 39 | #include <netinet/in.h> |
40 | #include <net/if.h> | |
41 | ||
e2bcd7db | 42 | #include "error.h" |
ae5c8b8e | 43 | #include "commands.h" |
b98f7d6e SH |
44 | #include "list.h" |
45 | #include "conf.h" | |
33ad9f1a | 46 | #include "utils.h" |
4ec31c52 | 47 | #include "bdev/bdev.h" |
f2363e38 ÇO |
48 | #include "log.h" |
49 | #include "cgroup.h" | |
50 | #include "start.h" | |
484ed030 | 51 | #include "state.h" |
36eb9bde | 52 | |
edaf8b1b SG |
53 | #if IS_BIONIC |
54 | #include <../include/lxcmntent.h> | |
55 | #else | |
56 | #include <mntent.h> | |
57 | #endif | |
58 | ||
4fb3cba5 DE |
59 | struct cgroup_hierarchy; |
60 | struct cgroup_meta_data; | |
61 | struct cgroup_mount_point; | |
62 | ||
63 | /* | |
64 | * cgroup_meta_data: the metadata about the cgroup infrastructure on this | |
65 | * host | |
66 | */ | |
67 | struct cgroup_meta_data { | |
68 | ptrdiff_t ref; /* simple refcount */ | |
69 | struct cgroup_hierarchy **hierarchies; | |
70 | struct cgroup_mount_point **mount_points; | |
71 | int maximum_hierarchy; | |
72 | }; | |
73 | ||
74 | /* | |
75 | * cgroup_hierarchy: describes a single cgroup hierarchy | |
76 | * (may have multiple mount points) | |
77 | */ | |
78 | struct cgroup_hierarchy { | |
79 | int index; | |
80 | bool used; /* false if the hierarchy should be ignored by lxc */ | |
81 | char **subsystems; | |
82 | struct cgroup_mount_point *rw_absolute_mount_point; | |
83 | struct cgroup_mount_point *ro_absolute_mount_point; | |
84 | struct cgroup_mount_point **all_mount_points; | |
85 | size_t all_mount_point_capacity; | |
86 | }; | |
87 | ||
88 | /* | |
89 | * cgroup_mount_point: a mount point to where a hierarchy | |
90 | * is mounted to | |
91 | */ | |
92 | struct cgroup_mount_point { | |
93 | struct cgroup_hierarchy *hierarchy; | |
94 | char *mount_point; | |
95 | char *mount_prefix; | |
96 | bool read_only; | |
97 | bool need_cpuset_init; | |
98 | }; | |
99 | ||
100 | /* | |
101 | * cgroup_process_info: describes the membership of a | |
102 | * process to the different cgroup | |
103 | * hierarchies | |
104 | * | |
105 | * Note this is the per-process info tracked by the cgfs_ops. | |
106 | * This is not used with cgmanager. | |
107 | */ | |
108 | struct cgroup_process_info { | |
109 | struct cgroup_process_info *next; | |
110 | struct cgroup_meta_data *meta_ref; | |
111 | struct cgroup_hierarchy *hierarchy; | |
112 | char *cgroup_path; | |
113 | char *cgroup_path_sub; | |
114 | char **created_paths; | |
115 | size_t created_paths_capacity; | |
116 | size_t created_paths_count; | |
117 | struct cgroup_mount_point *designated_mount_point; | |
118 | }; | |
119 | ||
120 | struct cgfs_data { | |
121 | char *name; | |
122 | const char *cgroup_pattern; | |
123 | struct cgroup_meta_data *meta; | |
124 | struct cgroup_process_info *info; | |
125 | }; | |
126 | ||
127 | lxc_log_define(lxc_cgfs, lxc); | |
576f946d | 128 | |
33ad9f1a CS |
129 | static struct cgroup_process_info *lxc_cgroup_process_info_getx(const char *proc_pid_cgroup_str, struct cgroup_meta_data *meta); |
130 | static char **subsystems_from_mount_options(const char *mount_options, char **kernel_list); | |
131 | static void lxc_cgroup_mount_point_free(struct cgroup_mount_point *mp); | |
132 | static void lxc_cgroup_hierarchy_free(struct cgroup_hierarchy *h); | |
133 | static bool is_valid_cgroup(const char *name); | |
33ad9f1a | 134 | static int create_cgroup(struct cgroup_mount_point *mp, const char *path); |
603c64c2 | 135 | static int remove_cgroup(struct cgroup_mount_point *mp, const char *path, bool recurse); |
33ad9f1a CS |
136 | static char *cgroup_to_absolute_path(struct cgroup_mount_point *mp, const char *path, const char *suffix); |
137 | static struct cgroup_process_info *find_info_for_subsystem(struct cgroup_process_info *info, const char *subsystem); | |
138 | static int do_cgroup_get(const char *cgroup_path, const char *sub_filename, char *value, size_t len); | |
139 | static int do_cgroup_set(const char *cgroup_path, const char *sub_filename, const char *value); | |
4fb3cba5 DE |
140 | static bool cgroup_devices_has_allow_or_deny(struct cgfs_data *d, char *v, bool for_allow); |
141 | static int do_setup_cgroup_limits(struct cgfs_data *d, struct lxc_list *cgroup_settings, bool do_devices); | |
33ad9f1a CS |
142 | static int cgroup_recursive_task_count(const char *cgroup_path); |
143 | static int count_lines(const char *fn); | |
1ea59ad2 | 144 | static int handle_cgroup_settings(struct cgroup_mount_point *mp, char *cgroup_path); |
d703c2b1 | 145 | static bool init_cpuset_if_needed(struct cgroup_mount_point *mp, const char *path); |
33ad9f1a | 146 | |
4fb3cba5 DE |
147 | static struct cgroup_meta_data *lxc_cgroup_load_meta2(const char **subsystem_whitelist); |
148 | static struct cgroup_meta_data *lxc_cgroup_get_meta(struct cgroup_meta_data *meta_data); | |
149 | static struct cgroup_meta_data *lxc_cgroup_put_meta(struct cgroup_meta_data *meta_data); | |
150 | ||
151 | /* free process membership information */ | |
152 | static void lxc_cgroup_process_info_free(struct cgroup_process_info *info); | |
153 | static void lxc_cgroup_process_info_free_and_remove(struct cgroup_process_info *info); | |
154 | ||
d4ef7c50 | 155 | static struct cgroup_ops cgfs_ops; |
d4ef7c50 | 156 | |
603c64c2 SH |
157 | static int cgroup_rmdir(char *dirname) |
158 | { | |
159 | struct dirent dirent, *direntp; | |
160 | int saved_errno = 0; | |
161 | DIR *dir; | |
162 | int ret, failed=0; | |
163 | char pathname[MAXPATHLEN]; | |
164 | ||
165 | dir = opendir(dirname); | |
166 | if (!dir) { | |
167 | ERROR("%s: failed to open %s", __func__, dirname); | |
168 | return -1; | |
169 | } | |
170 | ||
171 | while (!readdir_r(dir, &dirent, &direntp)) { | |
172 | struct stat mystat; | |
173 | int rc; | |
174 | ||
175 | if (!direntp) | |
176 | break; | |
177 | ||
178 | if (!strcmp(direntp->d_name, ".") || | |
179 | !strcmp(direntp->d_name, "..")) | |
180 | continue; | |
181 | ||
182 | rc = snprintf(pathname, MAXPATHLEN, "%s/%s", dirname, direntp->d_name); | |
183 | if (rc < 0 || rc >= MAXPATHLEN) { | |
184 | ERROR("pathname too long"); | |
185 | failed=1; | |
186 | if (!saved_errno) | |
187 | saved_errno = -ENOMEM; | |
188 | continue; | |
189 | } | |
190 | ret = lstat(pathname, &mystat); | |
191 | if (ret) { | |
192 | SYSERROR("%s: failed to stat %s", __func__, pathname); | |
193 | failed=1; | |
194 | if (!saved_errno) | |
195 | saved_errno = errno; | |
196 | continue; | |
197 | } | |
198 | if (S_ISDIR(mystat.st_mode)) { | |
199 | if (cgroup_rmdir(pathname) < 0) { | |
200 | if (!saved_errno) | |
201 | saved_errno = errno; | |
202 | failed=1; | |
203 | } | |
204 | } | |
205 | } | |
206 | ||
207 | if (rmdir(dirname) < 0) { | |
208 | SYSERROR("%s: failed to delete %s", __func__, dirname); | |
209 | if (!saved_errno) | |
210 | saved_errno = errno; | |
211 | failed=1; | |
212 | } | |
213 | ||
214 | ret = closedir(dir); | |
215 | if (ret) { | |
216 | SYSERROR("%s: failed to close directory %s", __func__, dirname); | |
217 | if (!saved_errno) | |
218 | saved_errno = errno; | |
219 | failed=1; | |
220 | } | |
221 | ||
222 | errno = saved_errno; | |
223 | return failed ? -1 : 0; | |
224 | } | |
225 | ||
4fb3cba5 | 226 | static struct cgroup_meta_data *lxc_cgroup_load_meta() |
33ad9f1a CS |
227 | { |
228 | const char *cgroup_use = NULL; | |
229 | char **cgroup_use_list = NULL; | |
230 | struct cgroup_meta_data *md = NULL; | |
231 | int saved_errno; | |
232 | ||
233 | errno = 0; | |
593e8478 | 234 | cgroup_use = lxc_global_config_value("lxc.cgroup.use"); |
33ad9f1a CS |
235 | if (!cgroup_use && errno != 0) |
236 | return NULL; | |
237 | if (cgroup_use) { | |
238 | cgroup_use_list = lxc_string_split_and_trim(cgroup_use, ','); | |
239 | if (!cgroup_use_list) | |
240 | return NULL; | |
241 | } | |
576f946d | 242 | |
33ad9f1a CS |
243 | md = lxc_cgroup_load_meta2((const char **)cgroup_use_list); |
244 | saved_errno = errno; | |
245 | lxc_free_array((void **)cgroup_use_list, free); | |
246 | errno = saved_errno; | |
247 | return md; | |
248 | } | |
fd37327f | 249 | |
b653309a | 250 | /* Step 1: determine all kernel subsystems */ |
4fb3cba5 | 251 | static bool find_cgroup_subsystems(char ***kernel_subsystems) |
1d39a065 | 252 | { |
b653309a SH |
253 | FILE *proc_cgroups; |
254 | bool bret = false; | |
33ad9f1a CS |
255 | char *line = NULL; |
256 | size_t sz = 0; | |
b653309a SH |
257 | size_t kernel_subsystems_count = 0; |
258 | size_t kernel_subsystems_capacity = 0; | |
259 | int r; | |
1d39a065 | 260 | |
33ad9f1a CS |
261 | proc_cgroups = fopen_cloexec("/proc/cgroups", "r"); |
262 | if (!proc_cgroups) | |
b653309a | 263 | return false; |
1d39a065 | 264 | |
33ad9f1a CS |
265 | while (getline(&line, &sz, proc_cgroups) != -1) { |
266 | char *tab1; | |
267 | char *tab2; | |
268 | int hierarchy_number; | |
1d39a065 | 269 | |
33ad9f1a CS |
270 | if (line[0] == '#') |
271 | continue; | |
272 | if (!line[0]) | |
273 | continue; | |
1d39a065 | 274 | |
33ad9f1a CS |
275 | tab1 = strchr(line, '\t'); |
276 | if (!tab1) | |
8900b9eb | 277 | continue; |
33ad9f1a CS |
278 | *tab1++ = '\0'; |
279 | tab2 = strchr(tab1, '\t'); | |
280 | if (!tab2) | |
281 | continue; | |
282 | *tab2 = '\0'; | |
fd37327f | 283 | |
33ad9f1a CS |
284 | tab2 = NULL; |
285 | hierarchy_number = strtoul(tab1, &tab2, 10); | |
286 | if (!tab2 || *tab2) | |
287 | continue; | |
288 | (void)hierarchy_number; | |
289 | ||
b653309a | 290 | r = lxc_grow_array((void ***)kernel_subsystems, &kernel_subsystems_capacity, kernel_subsystems_count + 1, 12); |
33ad9f1a | 291 | if (r < 0) |
b653309a SH |
292 | goto out; |
293 | (*kernel_subsystems)[kernel_subsystems_count] = strdup(line); | |
294 | if (!(*kernel_subsystems)[kernel_subsystems_count]) | |
295 | goto out; | |
33ad9f1a | 296 | kernel_subsystems_count++; |
bcbd102c | 297 | } |
b653309a | 298 | bret = true; |
0d9f8e18 | 299 | |
b653309a | 300 | out: |
33ad9f1a | 301 | fclose(proc_cgroups); |
0ccf7c2a | 302 | free(line); |
b653309a SH |
303 | return bret; |
304 | } | |
305 | ||
306 | /* Step 2: determine all hierarchies (by reading /proc/self/cgroup), | |
307 | * since mount points don't specify hierarchy number and | |
308 | * /proc/cgroups does not contain named hierarchies | |
309 | */ | |
310 | static bool find_cgroup_hierarchies(struct cgroup_meta_data *meta_data, | |
311 | bool all_kernel_subsystems, bool all_named_subsystems, | |
312 | const char **subsystem_whitelist) | |
313 | { | |
314 | FILE *proc_self_cgroup; | |
315 | char *line = NULL; | |
316 | size_t sz = 0; | |
317 | int r; | |
318 | bool bret = false; | |
319 | size_t hierarchy_capacity = 0; | |
ef6e34ee | 320 | |
33ad9f1a CS |
321 | proc_self_cgroup = fopen_cloexec("/proc/self/cgroup", "r"); |
322 | /* if for some reason (because of setns() and pid namespace for example), | |
323 | * /proc/self is not valid, we try /proc/1/cgroup... */ | |
324 | if (!proc_self_cgroup) | |
325 | proc_self_cgroup = fopen_cloexec("/proc/1/cgroup", "r"); | |
326 | if (!proc_self_cgroup) | |
b653309a | 327 | return false; |
33ad9f1a CS |
328 | |
329 | while (getline(&line, &sz, proc_self_cgroup) != -1) { | |
330 | /* file format: hierarchy:subsystems:group, | |
331 | * we only extract hierarchy and subsystems | |
332 | * here */ | |
333 | char *colon1; | |
334 | char *colon2; | |
335 | int hierarchy_number; | |
336 | struct cgroup_hierarchy *h = NULL; | |
337 | char **p; | |
338 | ||
339 | if (!line[0]) | |
340 | continue; | |
ad08bbb7 | 341 | |
33ad9f1a CS |
342 | colon1 = strchr(line, ':'); |
343 | if (!colon1) | |
8900b9eb | 344 | continue; |
33ad9f1a CS |
345 | *colon1++ = '\0'; |
346 | colon2 = strchr(colon1, ':'); | |
347 | if (!colon2) | |
348 | continue; | |
349 | *colon2 = '\0'; | |
ad08bbb7 | 350 | |
33ad9f1a CS |
351 | colon2 = NULL; |
352 | hierarchy_number = strtoul(line, &colon2, 10); | |
353 | if (!colon2 || *colon2) | |
354 | continue; | |
576f946d | 355 | |
33ad9f1a CS |
356 | if (hierarchy_number > meta_data->maximum_hierarchy) { |
357 | /* lxc_grow_array will never shrink, so even if we find a lower | |
358 | * hierarchy number here, the array will never be smaller | |
359 | */ | |
360 | r = lxc_grow_array((void ***)&meta_data->hierarchies, &hierarchy_capacity, hierarchy_number + 1, 12); | |
361 | if (r < 0) | |
b653309a | 362 | goto out; |
5193cc3d | 363 | |
33ad9f1a CS |
364 | meta_data->maximum_hierarchy = hierarchy_number; |
365 | } | |
fd37327f | 366 | |
33ad9f1a CS |
367 | /* this shouldn't happen, we had this already */ |
368 | if (meta_data->hierarchies[hierarchy_number]) | |
b653309a | 369 | goto out; |
33ad9f1a CS |
370 | |
371 | h = calloc(1, sizeof(struct cgroup_hierarchy)); | |
372 | if (!h) | |
b653309a | 373 | goto out; |
33ad9f1a CS |
374 | |
375 | meta_data->hierarchies[hierarchy_number] = h; | |
376 | ||
377 | h->index = hierarchy_number; | |
378 | h->subsystems = lxc_string_split_and_trim(colon1, ','); | |
379 | if (!h->subsystems) | |
b653309a | 380 | goto out; |
33ad9f1a CS |
381 | /* see if this hierarchy should be considered */ |
382 | if (!all_kernel_subsystems || !all_named_subsystems) { | |
383 | for (p = h->subsystems; *p; p++) { | |
384 | if (!strncmp(*p, "name=", 5)) { | |
385 | if (all_named_subsystems || (subsystem_whitelist && lxc_string_in_array(*p, subsystem_whitelist))) { | |
386 | h->used = true; | |
387 | break; | |
388 | } | |
389 | } else { | |
390 | if (all_kernel_subsystems || (subsystem_whitelist && lxc_string_in_array(*p, subsystem_whitelist))) { | |
391 | h->used = true; | |
392 | break; | |
393 | } | |
394 | } | |
395 | } | |
396 | } else { | |
397 | /* we want all hierarchy anyway */ | |
398 | h->used = true; | |
ae5c8b8e | 399 | } |
ae5c8b8e | 400 | } |
b653309a | 401 | bret = true; |
0b9c21ab | 402 | |
b653309a | 403 | out: |
33ad9f1a | 404 | fclose(proc_self_cgroup); |
0ccf7c2a | 405 | free(line); |
b653309a SH |
406 | return bret; |
407 | } | |
408 | ||
409 | /* Step 3: determine all mount points of each hierarchy */ | |
410 | static bool find_hierarchy_mountpts( struct cgroup_meta_data *meta_data, char **kernel_subsystems) | |
411 | { | |
412 | bool bret = false; | |
413 | FILE *proc_self_mountinfo; | |
414 | char *line = NULL; | |
415 | size_t sz = 0; | |
416 | char **tokens = NULL; | |
417 | size_t mount_point_count = 0; | |
418 | size_t mount_point_capacity = 0; | |
419 | size_t token_capacity = 0; | |
420 | int r; | |
421 | ||
33ad9f1a CS |
422 | proc_self_mountinfo = fopen_cloexec("/proc/self/mountinfo", "r"); |
423 | /* if for some reason (because of setns() and pid namespace for example), | |
424 | * /proc/self is not valid, we try /proc/1/cgroup... */ | |
425 | if (!proc_self_mountinfo) | |
426 | proc_self_mountinfo = fopen_cloexec("/proc/1/mountinfo", "r"); | |
427 | if (!proc_self_mountinfo) | |
b653309a | 428 | return false; |
33ad9f1a CS |
429 | |
430 | while (getline(&line, &sz, proc_self_mountinfo) != -1) { | |
178938fe | 431 | char *token, *line_tok, *saveptr = NULL; |
33ad9f1a CS |
432 | size_t i, j, k; |
433 | struct cgroup_mount_point *mount_point; | |
434 | struct cgroup_hierarchy *h; | |
435 | char **subsystems; | |
436 | ||
437 | if (line[0] && line[strlen(line) - 1] == '\n') | |
438 | line[strlen(line) - 1] = '\0'; | |
439 | ||
178938fe | 440 | for (i = 0, line_tok = line; (token = strtok_r(line_tok, " ", &saveptr)); line_tok = NULL) { |
33ad9f1a CS |
441 | r = lxc_grow_array((void ***)&tokens, &token_capacity, i + 1, 64); |
442 | if (r < 0) | |
b653309a | 443 | goto out; |
33ad9f1a CS |
444 | tokens[i++] = token; |
445 | } | |
b98f7d6e | 446 | |
33ad9f1a CS |
447 | /* layout of /proc/self/mountinfo: |
448 | * 0: id | |
449 | * 1: parent id | |
450 | * 2: device major:minor | |
451 | * 3: mount prefix | |
8900b9eb | 452 | * 4: mount point |
33ad9f1a CS |
453 | * 5: per-mount options |
454 | * [optional X]: additional data | |
455 | * X+7: "-" | |
456 | * X+8: type | |
457 | * X+9: source | |
458 | * X+10: per-superblock options | |
459 | */ | |
460 | for (j = 6; j < i && tokens[j]; j++) | |
461 | if (!strcmp(tokens[j], "-")) | |
462 | break; | |
fd4f5a56 | 463 | |
33ad9f1a CS |
464 | /* could not find separator */ |
465 | if (j >= i || !tokens[j]) | |
466 | continue; | |
467 | /* there should be exactly three fields after | |
468 | * the separator | |
469 | */ | |
470 | if (i != j + 4) | |
471 | continue; | |
fd4f5a56 | 472 | |
33ad9f1a CS |
473 | /* not a cgroup filesystem */ |
474 | if (strcmp(tokens[j + 1], "cgroup") != 0) | |
475 | continue; | |
b98f7d6e | 476 | |
33ad9f1a CS |
477 | subsystems = subsystems_from_mount_options(tokens[j + 3], kernel_subsystems); |
478 | if (!subsystems) | |
b653309a | 479 | goto out; |
33ad9f1a CS |
480 | |
481 | h = NULL; | |
482 | for (k = 1; k <= meta_data->maximum_hierarchy; k++) { | |
483 | if (meta_data->hierarchies[k] && | |
484 | meta_data->hierarchies[k]->subsystems[0] && | |
485 | lxc_string_in_array(meta_data->hierarchies[k]->subsystems[0], (const char **)subsystems)) { | |
486 | /* TODO: we could also check if the lists really match completely, | |
487 | * just to have an additional sanity check */ | |
488 | h = meta_data->hierarchies[k]; | |
b98f7d6e | 489 | break; |
33ad9f1a | 490 | } |
b98f7d6e | 491 | } |
33ad9f1a CS |
492 | lxc_free_array((void **)subsystems, free); |
493 | ||
494 | r = lxc_grow_array((void ***)&meta_data->mount_points, &mount_point_capacity, mount_point_count + 1, 12); | |
495 | if (r < 0) | |
b653309a | 496 | goto out; |
33ad9f1a CS |
497 | |
498 | /* create mount point object */ | |
499 | mount_point = calloc(1, sizeof(*mount_point)); | |
500 | if (!mount_point) | |
b653309a | 501 | goto out; |
33ad9f1a CS |
502 | |
503 | meta_data->mount_points[mount_point_count++] = mount_point; | |
504 | ||
505 | mount_point->hierarchy = h; | |
506 | mount_point->mount_point = strdup(tokens[4]); | |
507 | mount_point->mount_prefix = strdup(tokens[3]); | |
508 | if (!mount_point->mount_point || !mount_point->mount_prefix) | |
b653309a | 509 | goto out; |
33ad9f1a CS |
510 | mount_point->read_only = !lxc_string_in_list("rw", tokens[5], ','); |
511 | ||
512 | if (!strcmp(mount_point->mount_prefix, "/")) { | |
513 | if (mount_point->read_only) { | |
514 | if (!h->ro_absolute_mount_point) | |
515 | h->ro_absolute_mount_point = mount_point; | |
516 | } else { | |
517 | if (!h->rw_absolute_mount_point) | |
518 | h->rw_absolute_mount_point = mount_point; | |
519 | } | |
b98f7d6e | 520 | } |
ae5c8b8e | 521 | |
33ad9f1a CS |
522 | k = lxc_array_len((void **)h->all_mount_points); |
523 | r = lxc_grow_array((void ***)&h->all_mount_points, &h->all_mount_point_capacity, k + 1, 4); | |
524 | if (r < 0) | |
b653309a | 525 | goto out; |
33ad9f1a | 526 | h->all_mount_points[k] = mount_point; |
fd4f5a56 | 527 | } |
b653309a SH |
528 | bret = true; |
529 | ||
530 | out: | |
b653309a | 531 | fclose(proc_self_mountinfo); |
b653309a | 532 | free(tokens); |
2cdafc54 | 533 | free(line); |
b653309a SH |
534 | return bret; |
535 | } | |
536 | ||
4fb3cba5 | 537 | static struct cgroup_meta_data *lxc_cgroup_load_meta2(const char **subsystem_whitelist) |
b653309a SH |
538 | { |
539 | bool all_kernel_subsystems = true; | |
540 | bool all_named_subsystems = false; | |
541 | struct cgroup_meta_data *meta_data = NULL; | |
542 | char **kernel_subsystems = NULL; | |
543 | int saved_errno = 0; | |
544 | ||
545 | /* if the subsystem whitelist is not specified, include all | |
546 | * hierarchies that contain kernel subsystems by default but | |
547 | * no hierarchies that only contain named subsystems | |
548 | * | |
549 | * if it is specified, the specifier @all will select all | |
550 | * hierarchies, @kernel will select all hierarchies with | |
551 | * kernel subsystems and @named will select all named | |
552 | * hierarchies | |
553 | */ | |
554 | all_kernel_subsystems = subsystem_whitelist ? | |
555 | (lxc_string_in_array("@kernel", subsystem_whitelist) || lxc_string_in_array("@all", subsystem_whitelist)) : | |
556 | true; | |
557 | all_named_subsystems = subsystem_whitelist ? | |
558 | (lxc_string_in_array("@named", subsystem_whitelist) || lxc_string_in_array("@all", subsystem_whitelist)) : | |
79c59e6b | 559 | true; |
b653309a SH |
560 | |
561 | meta_data = calloc(1, sizeof(struct cgroup_meta_data)); | |
562 | if (!meta_data) | |
563 | return NULL; | |
564 | meta_data->ref = 1; | |
565 | ||
566 | if (!find_cgroup_subsystems(&kernel_subsystems)) | |
567 | goto out_error; | |
568 | ||
569 | if (!find_cgroup_hierarchies(meta_data, all_kernel_subsystems, | |
570 | all_named_subsystems, subsystem_whitelist)) | |
571 | goto out_error; | |
572 | ||
573 | if (!find_hierarchy_mountpts(meta_data, kernel_subsystems)) | |
574 | goto out_error; | |
fd4f5a56 | 575 | |
33ad9f1a CS |
576 | /* oops, we couldn't find anything */ |
577 | if (!meta_data->hierarchies || !meta_data->mount_points) { | |
578 | errno = EINVAL; | |
579 | goto out_error; | |
ae5c8b8e | 580 | } |
fd4f5a56 | 581 | |
3a0abb3a | 582 | lxc_free_array((void **)kernel_subsystems, free); |
33ad9f1a CS |
583 | return meta_data; |
584 | ||
585 | out_error: | |
586 | saved_errno = errno; | |
33ad9f1a CS |
587 | lxc_free_array((void **)kernel_subsystems, free); |
588 | lxc_cgroup_put_meta(meta_data); | |
589 | errno = saved_errno; | |
590 | return NULL; | |
fd4f5a56 DL |
591 | } |
592 | ||
4fb3cba5 | 593 | static struct cgroup_meta_data *lxc_cgroup_get_meta(struct cgroup_meta_data *meta_data) |
e14f67a7 | 594 | { |
33ad9f1a CS |
595 | meta_data->ref++; |
596 | return meta_data; | |
597 | } | |
e14f67a7 | 598 | |
4fb3cba5 | 599 | static struct cgroup_meta_data *lxc_cgroup_put_meta(struct cgroup_meta_data *meta_data) |
33ad9f1a CS |
600 | { |
601 | size_t i; | |
602 | if (!meta_data) | |
603 | return NULL; | |
604 | if (--meta_data->ref > 0) | |
605 | return meta_data; | |
606 | lxc_free_array((void **)meta_data->mount_points, (lxc_free_fn)lxc_cgroup_mount_point_free); | |
607 | if (meta_data->hierarchies) { | |
608 | for (i = 0; i <= meta_data->maximum_hierarchy; i++) | |
609 | lxc_cgroup_hierarchy_free(meta_data->hierarchies[i]); | |
e14f67a7 | 610 | } |
33ad9f1a | 611 | free(meta_data->hierarchies); |
178938fe | 612 | free(meta_data); |
33ad9f1a | 613 | return NULL; |
e14f67a7 U |
614 | } |
615 | ||
4fb3cba5 | 616 | static struct cgroup_hierarchy *lxc_cgroup_find_hierarchy(struct cgroup_meta_data *meta_data, const char *subsystem) |
e14f67a7 | 617 | { |
33ad9f1a CS |
618 | size_t i; |
619 | for (i = 0; i <= meta_data->maximum_hierarchy; i++) { | |
620 | struct cgroup_hierarchy *h = meta_data->hierarchies[i]; | |
621 | if (h && lxc_string_in_array(subsystem, (const char **)h->subsystems)) | |
622 | return h; | |
e14f67a7 | 623 | } |
e14f67a7 U |
624 | return NULL; |
625 | } | |
626 | ||
4fb3cba5 | 627 | static struct cgroup_mount_point *lxc_cgroup_find_mount_point(struct cgroup_hierarchy *hierarchy, const char *group, bool should_be_writable) |
b98f7d6e | 628 | { |
33ad9f1a CS |
629 | struct cgroup_mount_point **mps; |
630 | struct cgroup_mount_point *current_result = NULL; | |
631 | ssize_t quality = -1; | |
b98f7d6e | 632 | |
33ad9f1a CS |
633 | /* trivial case */ |
634 | if (hierarchy->rw_absolute_mount_point) | |
635 | return hierarchy->rw_absolute_mount_point; | |
636 | if (!should_be_writable && hierarchy->ro_absolute_mount_point) | |
637 | return hierarchy->ro_absolute_mount_point; | |
b98f7d6e | 638 | |
33ad9f1a CS |
639 | for (mps = hierarchy->all_mount_points; mps && *mps; mps++) { |
640 | struct cgroup_mount_point *mp = *mps; | |
641 | size_t prefix_len = mp->mount_prefix ? strlen(mp->mount_prefix) : 0; | |
b98f7d6e | 642 | |
33ad9f1a CS |
643 | if (prefix_len == 1 && mp->mount_prefix[0] == '/') |
644 | prefix_len = 0; | |
b98f7d6e | 645 | |
33ad9f1a CS |
646 | if (should_be_writable && mp->read_only) |
647 | continue; | |
648 | ||
649 | if (!prefix_len || | |
650 | (strncmp(group, mp->mount_prefix, prefix_len) == 0 && | |
651 | (group[prefix_len] == '\0' || group[prefix_len] == '/'))) { | |
652 | /* search for the best quality match, i.e. the match with the | |
653 | * shortest prefix where this group is still contained | |
654 | */ | |
655 | if (quality == -1 || prefix_len < quality) { | |
656 | current_result = mp; | |
657 | quality = prefix_len; | |
658 | } | |
b98f7d6e SH |
659 | } |
660 | } | |
661 | ||
33ad9f1a CS |
662 | if (!current_result) |
663 | errno = ENOENT; | |
664 | return current_result; | |
b98f7d6e SH |
665 | } |
666 | ||
4fb3cba5 | 667 | static char *lxc_cgroup_find_abs_path(const char *subsystem, const char *group, bool should_be_writable, const char *suffix) |
b98f7d6e | 668 | { |
33ad9f1a CS |
669 | struct cgroup_meta_data *meta_data; |
670 | struct cgroup_hierarchy *h; | |
671 | struct cgroup_mount_point *mp; | |
672 | char *result; | |
673 | int saved_errno; | |
674 | ||
675 | meta_data = lxc_cgroup_load_meta(); | |
676 | if (!meta_data) | |
677 | return NULL; | |
b98f7d6e | 678 | |
33ad9f1a CS |
679 | h = lxc_cgroup_find_hierarchy(meta_data, subsystem); |
680 | if (!h) | |
681 | goto out_error; | |
b98f7d6e | 682 | |
33ad9f1a CS |
683 | mp = lxc_cgroup_find_mount_point(h, group, should_be_writable); |
684 | if (!mp) | |
685 | goto out_error; | |
b98f7d6e | 686 | |
33ad9f1a CS |
687 | result = cgroup_to_absolute_path(mp, group, suffix); |
688 | if (!result) | |
689 | goto out_error; | |
b98f7d6e | 690 | |
33ad9f1a CS |
691 | lxc_cgroup_put_meta(meta_data); |
692 | return result; | |
b98f7d6e | 693 | |
33ad9f1a CS |
694 | out_error: |
695 | saved_errno = errno; | |
696 | lxc_cgroup_put_meta(meta_data); | |
697 | errno = saved_errno; | |
698 | return NULL; | |
b98f7d6e SH |
699 | } |
700 | ||
4fb3cba5 | 701 | static struct cgroup_process_info *lxc_cgroup_process_info_get(pid_t pid, struct cgroup_meta_data *meta) |
fd4f5a56 | 702 | { |
33ad9f1a CS |
703 | char pid_buf[32]; |
704 | snprintf(pid_buf, 32, "/proc/%lu/cgroup", (unsigned long)pid); | |
705 | return lxc_cgroup_process_info_getx(pid_buf, meta); | |
c8f7c563 CS |
706 | } |
707 | ||
4fb3cba5 | 708 | static struct cgroup_process_info *lxc_cgroup_process_info_get_init(struct cgroup_meta_data *meta) |
c8f7c563 | 709 | { |
33ad9f1a CS |
710 | return lxc_cgroup_process_info_get(1, meta); |
711 | } | |
b98f7d6e | 712 | |
4fb3cba5 | 713 | static struct cgroup_process_info *lxc_cgroup_process_info_get_self(struct cgroup_meta_data *meta) |
33ad9f1a CS |
714 | { |
715 | struct cgroup_process_info *i; | |
716 | i = lxc_cgroup_process_info_getx("/proc/self/cgroup", meta); | |
717 | if (!i) | |
718 | i = lxc_cgroup_process_info_get(getpid(), meta); | |
719 | return i; | |
720 | } | |
ae5c8b8e | 721 | |
692ba18f SH |
722 | /* |
723 | * If a controller has ns cgroup mounted, then in that cgroup the handler->pid | |
724 | * is already in a new cgroup named after the pid. 'mnt' is passed in as | |
725 | * the full current cgroup. Say that is /sys/fs/cgroup/lxc/2975 and the container | |
726 | * name is c1. . We want to rename the cgroup directory to /sys/fs/cgroup/lxc/c1, | |
727 | * and return the string /sys/fs/cgroup/lxc/c1. | |
728 | */ | |
cea0552e | 729 | static char *cgroup_rename_nsgroup(const char *mountpath, const char *oldname, pid_t pid, const char *name) |
692ba18f SH |
730 | { |
731 | char *dir, *fulloldpath; | |
732 | char *newname, *fullnewpath; | |
cea0552e | 733 | int len, newlen, ret; |
692ba18f SH |
734 | |
735 | /* | |
736 | * if cgroup is mounted at /cgroup and task is in cgroup /ab/, pid 2375 and | |
737 | * name is c1, | |
738 | * dir: /ab | |
739 | * fulloldpath = /cgroup/ab/2375 | |
740 | * fullnewpath = /cgroup/ab/c1 | |
741 | * newname = /ab/c1 | |
742 | */ | |
743 | dir = alloca(strlen(oldname) + 1); | |
744 | strcpy(dir, oldname); | |
745 | ||
cea0552e SH |
746 | len = strlen(oldname) + strlen(mountpath) + 22; |
747 | fulloldpath = alloca(len); | |
748 | ret = snprintf(fulloldpath, len, "%s/%s/%ld", mountpath, oldname, (unsigned long)pid); | |
749 | if (ret < 0 || ret >= len) | |
750 | return NULL; | |
692ba18f SH |
751 | |
752 | len = strlen(dir) + strlen(name) + 2; | |
753 | newname = malloc(len); | |
754 | if (!newname) { | |
755 | SYSERROR("Out of memory"); | |
756 | return NULL; | |
757 | } | |
cea0552e SH |
758 | ret = snprintf(newname, len, "%s/%s", dir, name); |
759 | if (ret < 0 || ret >= len) { | |
760 | free(newname); | |
761 | return NULL; | |
762 | } | |
692ba18f | 763 | |
cea0552e SH |
764 | newlen = strlen(mountpath) + len + 2; |
765 | fullnewpath = alloca(newlen); | |
766 | ret = snprintf(fullnewpath, newlen, "%s/%s", mountpath, newname); | |
767 | if (ret < 0 || ret >= newlen) { | |
768 | free(newname); | |
769 | return NULL; | |
770 | } | |
692ba18f SH |
771 | |
772 | if (access(fullnewpath, F_OK) == 0) { | |
773 | if (rmdir(fullnewpath) != 0) { | |
774 | SYSERROR("container cgroup %s already exists.", fullnewpath); | |
775 | free(newname); | |
776 | return NULL; | |
777 | } | |
778 | } | |
779 | if (rename(fulloldpath, fullnewpath)) { | |
780 | SYSERROR("failed to rename cgroup %s->%s", fulloldpath, fullnewpath); | |
781 | free(newname); | |
782 | return NULL; | |
783 | } | |
784 | ||
785 | DEBUG("'%s' renamed to '%s'", oldname, newname); | |
786 | ||
787 | return newname; | |
788 | } | |
789 | ||
33ad9f1a | 790 | /* create a new cgroup */ |
4fb3cba5 | 791 | static struct cgroup_process_info *lxc_cgroupfs_create(const char *name, const char *path_pattern, struct cgroup_meta_data *meta_data, const char *sub_pattern) |
33ad9f1a | 792 | { |
001b026e | 793 | char **cgroup_path_components = NULL; |
33ad9f1a CS |
794 | char **p = NULL; |
795 | char *path_so_far = NULL; | |
796 | char **new_cgroup_paths = NULL; | |
797 | char **new_cgroup_paths_sub = NULL; | |
798 | struct cgroup_mount_point *mp; | |
799 | struct cgroup_hierarchy *h; | |
800 | struct cgroup_process_info *base_info = NULL; | |
801 | struct cgroup_process_info *info_ptr; | |
802 | int saved_errno; | |
803 | int r; | |
804 | unsigned suffix = 0; | |
805 | bool had_sub_pattern = false; | |
806 | size_t i; | |
ae5c8b8e | 807 | |
33ad9f1a CS |
808 | if (!is_valid_cgroup(name)) { |
809 | ERROR("Invalid cgroup name: '%s'", name); | |
810 | errno = EINVAL; | |
811 | return NULL; | |
ae5c8b8e SH |
812 | } |
813 | ||
33ad9f1a CS |
814 | if (!strstr(path_pattern, "%n")) { |
815 | ERROR("Invalid cgroup path pattern: '%s'; contains no %%n for specifying container name", path_pattern); | |
816 | errno = EINVAL; | |
817 | return NULL; | |
818 | } | |
fd37327f | 819 | |
33ad9f1a CS |
820 | /* we will modify the result of this operation directly, |
821 | * so we don't have to copy the data structure | |
822 | */ | |
823 | base_info = (path_pattern[0] == '/') ? | |
824 | lxc_cgroup_process_info_get_init(meta_data) : | |
825 | lxc_cgroup_process_info_get_self(meta_data); | |
826 | if (!base_info) | |
827 | return NULL; | |
c8f7c563 | 828 | |
33ad9f1a CS |
829 | new_cgroup_paths = calloc(meta_data->maximum_hierarchy + 1, sizeof(char *)); |
830 | if (!new_cgroup_paths) | |
831 | goto out_initial_error; | |
832 | ||
833 | new_cgroup_paths_sub = calloc(meta_data->maximum_hierarchy + 1, sizeof(char *)); | |
834 | if (!new_cgroup_paths_sub) | |
835 | goto out_initial_error; | |
836 | ||
837 | /* find mount points we can use */ | |
838 | for (info_ptr = base_info; info_ptr; info_ptr = info_ptr->next) { | |
839 | h = info_ptr->hierarchy; | |
840 | mp = lxc_cgroup_find_mount_point(h, info_ptr->cgroup_path, true); | |
841 | if (!mp) { | |
842 | ERROR("Could not find writable mount point for cgroup hierarchy %d while trying to create cgroup.", h->index); | |
843 | goto out_initial_error; | |
844 | } | |
845 | info_ptr->designated_mount_point = mp; | |
460a1cf0 | 846 | |
692ba18f SH |
847 | if (lxc_string_in_array("ns", (const char **)h->subsystems)) |
848 | continue; | |
2edb53c7 SH |
849 | if (handle_cgroup_settings(mp, info_ptr->cgroup_path) < 0) { |
850 | ERROR("Could not set clone_children to 1 for cpuset hierarchy in parent cgroup."); | |
33ad9f1a | 851 | goto out_initial_error; |
2edb53c7 | 852 | } |
33ad9f1a | 853 | } |
b98f7d6e | 854 | |
33ad9f1a CS |
855 | /* normalize the path */ |
856 | cgroup_path_components = lxc_normalize_path(path_pattern); | |
857 | if (!cgroup_path_components) | |
858 | goto out_initial_error; | |
859 | ||
860 | /* go through the path components to see if we can create them */ | |
861 | for (p = cgroup_path_components; *p || (sub_pattern && !had_sub_pattern); p++) { | |
862 | /* we only want to create the same component with -1, -2, etc. | |
863 | * if the component contains the container name itself, otherwise | |
864 | * it's not an error if it already exists | |
865 | */ | |
866 | char *p_eff = *p ? *p : (char *)sub_pattern; | |
867 | bool contains_name = strstr(p_eff, "%n"); | |
868 | char *current_component = NULL; | |
869 | char *current_subpath = NULL; | |
870 | char *current_entire_path = NULL; | |
871 | char *parts[3]; | |
872 | size_t j = 0; | |
873 | i = 0; | |
874 | ||
875 | /* if we are processing the subpattern, we want to make sure | |
876 | * loop is ended the next time around | |
877 | */ | |
878 | if (!*p) { | |
879 | had_sub_pattern = true; | |
880 | p--; | |
881 | } | |
b98f7d6e | 882 | |
33ad9f1a | 883 | goto find_name_on_this_level; |
4fb3cba5 | 884 | |
33ad9f1a CS |
885 | cleanup_name_on_this_level: |
886 | /* This is reached if we found a name clash. | |
887 | * In that case, remove the cgroup from all previous hierarchies | |
888 | */ | |
889 | for (j = 0, info_ptr = base_info; j < i && info_ptr; info_ptr = info_ptr->next, j++) { | |
603c64c2 | 890 | r = remove_cgroup(info_ptr->designated_mount_point, info_ptr->created_paths[info_ptr->created_paths_count - 1], false); |
33ad9f1a CS |
891 | if (r < 0) |
892 | WARN("could not clean up cgroup we created when trying to create container"); | |
893 | free(info_ptr->created_paths[info_ptr->created_paths_count - 1]); | |
894 | info_ptr->created_paths[--info_ptr->created_paths_count] = NULL; | |
895 | } | |
896 | if (current_component != current_subpath) | |
897 | free(current_subpath); | |
898 | if (current_component != p_eff) | |
899 | free(current_component); | |
900 | current_component = current_subpath = NULL; | |
901 | /* try again with another suffix */ | |
902 | ++suffix; | |
4fb3cba5 | 903 | |
33ad9f1a CS |
904 | find_name_on_this_level: |
905 | /* determine name of the path component we should create */ | |
906 | if (contains_name && suffix > 0) { | |
907 | char *buf = calloc(strlen(name) + 32, 1); | |
908 | if (!buf) | |
909 | goto out_initial_error; | |
910 | snprintf(buf, strlen(name) + 32, "%s-%u", name, suffix); | |
911 | current_component = lxc_string_replace("%n", buf, p_eff); | |
912 | free(buf); | |
913 | } else { | |
914 | current_component = contains_name ? lxc_string_replace("%n", name, p_eff) : p_eff; | |
915 | } | |
916 | parts[0] = path_so_far; | |
917 | parts[1] = current_component; | |
918 | parts[2] = NULL; | |
919 | current_subpath = path_so_far ? lxc_string_join("/", (const char **)parts, false) : current_component; | |
920 | ||
921 | /* Now go through each hierarchy and try to create the | |
922 | * corresponding cgroup | |
923 | */ | |
924 | for (i = 0, info_ptr = base_info; info_ptr; info_ptr = info_ptr->next, i++) { | |
925 | char *parts2[3]; | |
692ba18f SH |
926 | |
927 | if (lxc_string_in_array("ns", (const char **)info_ptr->hierarchy->subsystems)) | |
928 | continue; | |
33ad9f1a CS |
929 | current_entire_path = NULL; |
930 | ||
931 | parts2[0] = !strcmp(info_ptr->cgroup_path, "/") ? "" : info_ptr->cgroup_path; | |
932 | parts2[1] = current_subpath; | |
933 | parts2[2] = NULL; | |
934 | current_entire_path = lxc_string_join("/", (const char **)parts2, false); | |
935 | ||
936 | if (!*p) { | |
937 | /* we are processing the subpath, so only update that one */ | |
938 | free(new_cgroup_paths_sub[i]); | |
939 | new_cgroup_paths_sub[i] = strdup(current_entire_path); | |
940 | if (!new_cgroup_paths_sub[i]) | |
941 | goto cleanup_from_error; | |
942 | } else { | |
943 | /* remember which path was used on this controller */ | |
944 | free(new_cgroup_paths[i]); | |
945 | new_cgroup_paths[i] = strdup(current_entire_path); | |
946 | if (!new_cgroup_paths[i]) | |
947 | goto cleanup_from_error; | |
948 | } | |
fd4f5a56 | 949 | |
33ad9f1a CS |
950 | r = create_cgroup(info_ptr->designated_mount_point, current_entire_path); |
951 | if (r < 0 && errno == EEXIST && contains_name) { | |
952 | /* name clash => try new name with new suffix */ | |
953 | free(current_entire_path); | |
954 | current_entire_path = NULL; | |
955 | goto cleanup_name_on_this_level; | |
956 | } else if (r < 0 && errno != EEXIST) { | |
b38b62a6 | 957 | SYSERROR("Could not create cgroup '%s' in '%s'.", current_entire_path, info_ptr->designated_mount_point->mount_point); |
33ad9f1a CS |
958 | goto cleanup_from_error; |
959 | } else if (r == 0) { | |
960 | /* successfully created */ | |
961 | r = lxc_grow_array((void ***)&info_ptr->created_paths, &info_ptr->created_paths_capacity, info_ptr->created_paths_count + 1, 8); | |
962 | if (r < 0) | |
963 | goto cleanup_from_error; | |
d703c2b1 | 964 | if (!init_cpuset_if_needed(info_ptr->designated_mount_point, current_entire_path)) { |
b38b62a6 | 965 | ERROR("Failed to initialize cpuset for '%s' in '%s'.", current_entire_path, info_ptr->designated_mount_point->mount_point); |
d703c2b1 RV |
966 | goto cleanup_from_error; |
967 | } | |
33ad9f1a CS |
968 | info_ptr->created_paths[info_ptr->created_paths_count++] = current_entire_path; |
969 | } else { | |
970 | /* if we didn't create the cgroup, then we have to make sure that | |
971 | * further cgroups will be created properly | |
972 | */ | |
d703c2b1 | 973 | if (handle_cgroup_settings(info_ptr->designated_mount_point, info_ptr->cgroup_path) < 0) { |
f6ac3b9e | 974 | ERROR("Could not set clone_children to 1 for cpuset hierarchy in pre-existing cgroup."); |
33ad9f1a | 975 | goto cleanup_from_error; |
f6ac3b9e | 976 | } |
d703c2b1 RV |
977 | if (!init_cpuset_if_needed(info_ptr->designated_mount_point, info_ptr->cgroup_path)) { |
978 | ERROR("Failed to initialize cpuset in pre-existing '%s'.", info_ptr->cgroup_path); | |
979 | goto cleanup_from_error; | |
980 | } | |
33ad9f1a CS |
981 | |
982 | /* already existed but path component of pattern didn't contain '%n', | |
983 | * so this is not an error; but then we don't need current_entire_path | |
984 | * anymore... | |
985 | */ | |
986 | free(current_entire_path); | |
987 | current_entire_path = NULL; | |
988 | } | |
989 | } | |
fd4f5a56 | 990 | |
33ad9f1a CS |
991 | /* save path so far */ |
992 | free(path_so_far); | |
993 | path_so_far = strdup(current_subpath); | |
994 | if (!path_so_far) | |
995 | goto cleanup_from_error; | |
996 | ||
997 | /* cleanup */ | |
998 | if (current_component != current_subpath) | |
999 | free(current_subpath); | |
1000 | if (current_component != p_eff) | |
1001 | free(current_component); | |
1002 | current_component = current_subpath = NULL; | |
1003 | continue; | |
4fb3cba5 | 1004 | |
33ad9f1a | 1005 | cleanup_from_error: |
ec64264d | 1006 | /* called if an error occurred in the loop, so we |
33ad9f1a CS |
1007 | * do some additional cleanup here |
1008 | */ | |
1009 | saved_errno = errno; | |
1010 | if (current_component != current_subpath) | |
1011 | free(current_subpath); | |
1012 | if (current_component != p_eff) | |
1013 | free(current_component); | |
1014 | free(current_entire_path); | |
1015 | errno = saved_errno; | |
1016 | goto out_initial_error; | |
fd4f5a56 DL |
1017 | } |
1018 | ||
33ad9f1a CS |
1019 | /* we're done, now update the paths */ |
1020 | for (i = 0, info_ptr = base_info; info_ptr; info_ptr = info_ptr->next, i++) { | |
47d8fb3b CS |
1021 | /* ignore legacy 'ns' subsystem here, lxc_cgroup_create_legacy |
1022 | * will take care of it | |
1023 | * Since we do a continue in above loop, new_cgroup_paths[i] is | |
1024 | * unset anyway, as is new_cgroup_paths_sub[i] | |
692ba18f | 1025 | */ |
47d8fb3b CS |
1026 | if (lxc_string_in_array("ns", (const char **)info_ptr->hierarchy->subsystems)) |
1027 | continue; | |
1028 | free(info_ptr->cgroup_path); | |
1029 | info_ptr->cgroup_path = new_cgroup_paths[i]; | |
1030 | info_ptr->cgroup_path_sub = new_cgroup_paths_sub[i]; | |
fd4f5a56 | 1031 | } |
33ad9f1a CS |
1032 | /* don't use lxc_free_array since we used the array members |
1033 | * to store them in our result... | |
1034 | */ | |
1035 | free(new_cgroup_paths); | |
1036 | free(new_cgroup_paths_sub); | |
1037 | free(path_so_far); | |
1038 | lxc_free_array((void **)cgroup_path_components, free); | |
1039 | return base_info; | |
1040 | ||
1041 | out_initial_error: | |
1042 | saved_errno = errno; | |
1043 | free(path_so_far); | |
1044 | lxc_cgroup_process_info_free_and_remove(base_info); | |
1045 | lxc_free_array((void **)new_cgroup_paths, free); | |
1046 | lxc_free_array((void **)new_cgroup_paths_sub, free); | |
1047 | lxc_free_array((void **)cgroup_path_components, free); | |
1048 | errno = saved_errno; | |
1049 | return NULL; | |
c8f7c563 CS |
1050 | } |
1051 | ||
4fb3cba5 | 1052 | static int lxc_cgroup_create_legacy(struct cgroup_process_info *base_info, const char *name, pid_t pid) |
47d8fb3b CS |
1053 | { |
1054 | struct cgroup_process_info *info_ptr; | |
1055 | int r; | |
1056 | ||
1057 | for (info_ptr = base_info; info_ptr; info_ptr = info_ptr->next) { | |
1058 | if (!lxc_string_in_array("ns", (const char **)info_ptr->hierarchy->subsystems)) | |
1059 | continue; | |
1060 | /* | |
1061 | * For any path which has ns cgroup mounted, handler->pid is already | |
1062 | * moved into a container called '%d % (handler->pid)'. Rename it to | |
1063 | * the cgroup name and record that. | |
1064 | */ | |
1065 | char *tmp = cgroup_rename_nsgroup((const char *)info_ptr->designated_mount_point->mount_point, | |
1066 | info_ptr->cgroup_path, pid, name); | |
1067 | if (!tmp) | |
1068 | return -1; | |
1069 | free(info_ptr->cgroup_path); | |
1070 | info_ptr->cgroup_path = tmp; | |
1071 | r = lxc_grow_array((void ***)&info_ptr->created_paths, &info_ptr->created_paths_capacity, info_ptr->created_paths_count + 1, 8); | |
1072 | if (r < 0) | |
1073 | return -1; | |
1074 | tmp = strdup(tmp); | |
1075 | if (!tmp) | |
1076 | return -1; | |
1077 | info_ptr->created_paths[info_ptr->created_paths_count++] = tmp; | |
1078 | } | |
1079 | return 0; | |
1080 | } | |
1081 | ||
33ad9f1a | 1082 | /* get the cgroup membership of a given container */ |
4fb3cba5 | 1083 | static struct cgroup_process_info *lxc_cgroup_get_container_info(const char *name, const char *lxcpath, struct cgroup_meta_data *meta_data) |
c8f7c563 | 1084 | { |
33ad9f1a CS |
1085 | struct cgroup_process_info *result = NULL; |
1086 | int saved_errno = 0; | |
1087 | size_t i; | |
1088 | struct cgroup_process_info **cptr = &result; | |
1089 | struct cgroup_process_info *entry = NULL; | |
1090 | char *path = NULL; | |
1091 | ||
1092 | for (i = 0; i <= meta_data->maximum_hierarchy; i++) { | |
1093 | struct cgroup_hierarchy *h = meta_data->hierarchies[i]; | |
1094 | if (!h || !h->used) | |
1095 | continue; | |
c8f7c563 | 1096 | |
33ad9f1a CS |
1097 | /* use the command interface to look for the cgroup */ |
1098 | path = lxc_cmd_get_cgroup_path(name, lxcpath, h->subsystems[0]); | |
c661b0a8 DE |
1099 | if (!path) { |
1100 | h->used = false; | |
1101 | WARN("Not attaching to cgroup %s unknown to %s %s", h->subsystems[0], lxcpath, name); | |
1102 | continue; | |
1103 | } | |
33ad9f1a CS |
1104 | |
1105 | entry = calloc(1, sizeof(struct cgroup_process_info)); | |
1106 | if (!entry) | |
1107 | goto out_error; | |
1108 | entry->meta_ref = lxc_cgroup_get_meta(meta_data); | |
1109 | entry->hierarchy = h; | |
1110 | entry->cgroup_path = path; | |
1111 | path = NULL; | |
1112 | ||
1113 | /* it is not an error if we don't find anything here, | |
1114 | * it is up to the caller to decide what to do in that | |
1115 | * case */ | |
1116 | entry->designated_mount_point = lxc_cgroup_find_mount_point(h, entry->cgroup_path, true); | |
1117 | ||
1118 | *cptr = entry; | |
1119 | cptr = &entry->next; | |
1120 | entry = NULL; | |
c8f7c563 CS |
1121 | } |
1122 | ||
33ad9f1a CS |
1123 | return result; |
1124 | out_error: | |
1125 | saved_errno = errno; | |
1126 | free(path); | |
1127 | lxc_cgroup_process_info_free(result); | |
1128 | lxc_cgroup_process_info_free(entry); | |
1129 | errno = saved_errno; | |
1130 | return NULL; | |
fd4f5a56 DL |
1131 | } |
1132 | ||
33ad9f1a | 1133 | /* move a processs to the cgroups specified by the membership */ |
4fb3cba5 | 1134 | static int lxc_cgroupfs_enter(struct cgroup_process_info *info, pid_t pid, bool enter_sub) |
4f17323e | 1135 | { |
33ad9f1a CS |
1136 | char pid_buf[32]; |
1137 | char *cgroup_tasks_fn; | |
1138 | int r; | |
1139 | struct cgroup_process_info *info_ptr; | |
1140 | ||
1141 | snprintf(pid_buf, 32, "%lu", (unsigned long)pid); | |
1142 | for (info_ptr = info; info_ptr; info_ptr = info_ptr->next) { | |
1143 | char *cgroup_path = (enter_sub && info_ptr->cgroup_path_sub) ? | |
1144 | info_ptr->cgroup_path_sub : | |
1145 | info_ptr->cgroup_path; | |
1146 | ||
1147 | if (!info_ptr->designated_mount_point) { | |
1148 | info_ptr->designated_mount_point = lxc_cgroup_find_mount_point(info_ptr->hierarchy, cgroup_path, true); | |
1149 | if (!info_ptr->designated_mount_point) { | |
1150 | SYSERROR("Could not add pid %lu to cgroup %s: internal error (couldn't find any writable mountpoint to cgroup filesystem)", (unsigned long)pid, cgroup_path); | |
1151 | return -1; | |
1152 | } | |
1153 | } | |
4f17323e | 1154 | |
33ad9f1a CS |
1155 | cgroup_tasks_fn = cgroup_to_absolute_path(info_ptr->designated_mount_point, cgroup_path, "/tasks"); |
1156 | if (!cgroup_tasks_fn) { | |
1157 | SYSERROR("Could not add pid %lu to cgroup %s: internal error", (unsigned long)pid, cgroup_path); | |
1158 | return -1; | |
1159 | } | |
4f17323e | 1160 | |
33ad9f1a | 1161 | r = lxc_write_to_file(cgroup_tasks_fn, pid_buf, strlen(pid_buf), false); |
5903da82 | 1162 | free(cgroup_tasks_fn); |
33ad9f1a CS |
1163 | if (r < 0) { |
1164 | SYSERROR("Could not add pid %lu to cgroup %s: internal error", (unsigned long)pid, cgroup_path); | |
1165 | return -1; | |
1166 | } | |
4f17323e CS |
1167 | } |
1168 | ||
33ad9f1a | 1169 | return 0; |
4f17323e CS |
1170 | } |
1171 | ||
33ad9f1a CS |
1172 | /* free process membership information */ |
1173 | void lxc_cgroup_process_info_free(struct cgroup_process_info *info) | |
fc7de561 | 1174 | { |
33ad9f1a CS |
1175 | struct cgroup_process_info *next; |
1176 | if (!info) | |
b98f7d6e | 1177 | return; |
33ad9f1a CS |
1178 | next = info->next; |
1179 | lxc_cgroup_put_meta(info->meta_ref); | |
1180 | free(info->cgroup_path); | |
1181 | free(info->cgroup_path_sub); | |
1182 | lxc_free_array((void **)info->created_paths, free); | |
1183 | free(info); | |
1184 | lxc_cgroup_process_info_free(next); | |
fc7de561 SH |
1185 | } |
1186 | ||
33ad9f1a CS |
1187 | /* free process membership information and remove cgroups that were created */ |
1188 | void lxc_cgroup_process_info_free_and_remove(struct cgroup_process_info *info) | |
b98f7d6e | 1189 | { |
33ad9f1a CS |
1190 | struct cgroup_process_info *next; |
1191 | char **pp; | |
1192 | if (!info) | |
1193 | return; | |
1194 | next = info->next; | |
603c64c2 | 1195 | { |
33ad9f1a CS |
1196 | struct cgroup_mount_point *mp = info->designated_mount_point; |
1197 | if (!mp) | |
1198 | mp = lxc_cgroup_find_mount_point(info->hierarchy, info->cgroup_path, true); | |
1199 | if (mp) | |
1200 | /* ignore return value here, perhaps we created the | |
1201 | * '/lxc' cgroup in this container but another container | |
1202 | * is still running (for example) | |
1203 | */ | |
603c64c2 SH |
1204 | (void)remove_cgroup(mp, info->cgroup_path, true); |
1205 | } | |
1206 | for (pp = info->created_paths; pp && *pp; pp++); | |
1207 | for ((void)(pp && --pp); info->created_paths && pp >= info->created_paths; --pp) { | |
33ad9f1a | 1208 | free(*pp); |
b98f7d6e | 1209 | } |
33ad9f1a CS |
1210 | free(info->created_paths); |
1211 | lxc_cgroup_put_meta(info->meta_ref); | |
1212 | free(info->cgroup_path); | |
1213 | free(info->cgroup_path_sub); | |
1214 | free(info); | |
9431aa65 | 1215 | lxc_cgroup_process_info_free_and_remove(next); |
33ad9f1a | 1216 | } |
b98f7d6e | 1217 | |
4fb3cba5 | 1218 | static char *lxc_cgroup_get_hierarchy_path_data(const char *subsystem, struct cgfs_data *d) |
33ad9f1a | 1219 | { |
d4ef7c50 SH |
1220 | struct cgroup_process_info *info = d->info; |
1221 | info = find_info_for_subsystem(info, subsystem); | |
33ad9f1a CS |
1222 | if (!info) |
1223 | return NULL; | |
f348e47c | 1224 | prune_init_scope(info->cgroup_path); |
33ad9f1a | 1225 | return info->cgroup_path; |
b98f7d6e SH |
1226 | } |
1227 | ||
4fb3cba5 | 1228 | static char *lxc_cgroup_get_hierarchy_abs_path_data(const char *subsystem, struct cgfs_data *d) |
b98f7d6e | 1229 | { |
d4ef7c50 | 1230 | struct cgroup_process_info *info = d->info; |
33ad9f1a | 1231 | struct cgroup_mount_point *mp = NULL; |
d4ef7c50 SH |
1232 | |
1233 | info = find_info_for_subsystem(info, subsystem); | |
33ad9f1a CS |
1234 | if (!info) |
1235 | return NULL; | |
1236 | if (info->designated_mount_point) { | |
8900b9eb | 1237 | mp = info->designated_mount_point; |
33ad9f1a CS |
1238 | } else { |
1239 | mp = lxc_cgroup_find_mount_point(info->hierarchy, info->cgroup_path, true); | |
1240 | if (!mp) | |
1241 | return NULL; | |
b98f7d6e | 1242 | } |
33ad9f1a | 1243 | return cgroup_to_absolute_path(mp, info->cgroup_path, NULL); |
b98f7d6e | 1244 | } |
55c76589 | 1245 | |
4fb3cba5 | 1246 | static char *lxc_cgroup_get_hierarchy_abs_path(const char *subsystem, const char *name, const char *lxcpath) |
9a93d992 | 1247 | { |
33ad9f1a CS |
1248 | struct cgroup_meta_data *meta; |
1249 | struct cgroup_process_info *base_info, *info; | |
1250 | struct cgroup_mount_point *mp; | |
1251 | char *result = NULL; | |
33ad9f1a CS |
1252 | |
1253 | meta = lxc_cgroup_load_meta(); | |
1254 | if (!meta) | |
9a93d992 | 1255 | return NULL; |
33ad9f1a CS |
1256 | base_info = lxc_cgroup_get_container_info(name, lxcpath, meta); |
1257 | if (!base_info) | |
178938fe | 1258 | goto out1; |
33ad9f1a CS |
1259 | info = find_info_for_subsystem(base_info, subsystem); |
1260 | if (!info) | |
178938fe | 1261 | goto out2; |
33ad9f1a | 1262 | if (info->designated_mount_point) { |
8900b9eb | 1263 | mp = info->designated_mount_point; |
33ad9f1a CS |
1264 | } else { |
1265 | mp = lxc_cgroup_find_mount_point(info->hierarchy, info->cgroup_path, true); | |
1266 | if (!mp) | |
178938fe | 1267 | goto out3; |
33ad9f1a CS |
1268 | } |
1269 | result = cgroup_to_absolute_path(mp, info->cgroup_path, NULL); | |
178938fe | 1270 | out3: |
178938fe | 1271 | out2: |
33ad9f1a | 1272 | lxc_cgroup_process_info_free(base_info); |
178938fe | 1273 | out1: |
33ad9f1a | 1274 | lxc_cgroup_put_meta(meta); |
33ad9f1a CS |
1275 | return result; |
1276 | } | |
9a93d992 | 1277 | |
4fb3cba5 | 1278 | static int lxc_cgroup_set_data(const char *filename, const char *value, struct cgfs_data *d) |
33ad9f1a CS |
1279 | { |
1280 | char *subsystem = NULL, *p, *path; | |
1281 | int ret = -1; | |
9a93d992 | 1282 | |
33ad9f1a CS |
1283 | subsystem = alloca(strlen(filename) + 1); |
1284 | strcpy(subsystem, filename); | |
46cd2845 | 1285 | if ((p = strchr(subsystem, '.')) != NULL) |
33ad9f1a | 1286 | *p = '\0'; |
9a93d992 | 1287 | |
4fb3cba5 | 1288 | path = lxc_cgroup_get_hierarchy_abs_path_data(subsystem, d); |
33ad9f1a CS |
1289 | if (path) { |
1290 | ret = do_cgroup_set(path, filename, value); | |
1291 | free(path); | |
9a93d992 | 1292 | } |
33ad9f1a CS |
1293 | return ret; |
1294 | } | |
9a93d992 | 1295 | |
4fb3cba5 | 1296 | static int lxc_cgroupfs_set(const char *filename, const char *value, const char *name, const char *lxcpath) |
9a93d992 | 1297 | { |
33ad9f1a CS |
1298 | char *subsystem = NULL, *p, *path; |
1299 | int ret = -1; | |
9a93d992 | 1300 | |
33ad9f1a CS |
1301 | subsystem = alloca(strlen(filename) + 1); |
1302 | strcpy(subsystem, filename); | |
46cd2845 | 1303 | if ((p = strchr(subsystem, '.')) != NULL) |
33ad9f1a | 1304 | *p = '\0'; |
9a93d992 | 1305 | |
33ad9f1a CS |
1306 | path = lxc_cgroup_get_hierarchy_abs_path(subsystem, name, lxcpath); |
1307 | if (path) { | |
1308 | ret = do_cgroup_set(path, filename, value); | |
1309 | free(path); | |
1310 | } | |
b98f7d6e | 1311 | return ret; |
9a93d992 SH |
1312 | } |
1313 | ||
4fb3cba5 | 1314 | static int lxc_cgroupfs_get(const char *filename, char *value, size_t len, const char *name, const char *lxcpath) |
9a93d992 | 1315 | { |
33ad9f1a CS |
1316 | char *subsystem = NULL, *p, *path; |
1317 | int ret = -1; | |
1318 | ||
1319 | subsystem = alloca(strlen(filename) + 1); | |
1320 | strcpy(subsystem, filename); | |
46cd2845 | 1321 | if ((p = strchr(subsystem, '.')) != NULL) |
33ad9f1a CS |
1322 | *p = '\0'; |
1323 | ||
1324 | path = lxc_cgroup_get_hierarchy_abs_path(subsystem, name, lxcpath); | |
1325 | if (path) { | |
1326 | ret = do_cgroup_get(path, filename, value, len); | |
1327 | free(path); | |
9a93d992 | 1328 | } |
33ad9f1a | 1329 | return ret; |
9a93d992 SH |
1330 | } |
1331 | ||
4fb3cba5 | 1332 | static bool cgroupfs_mount_cgroup(void *hdata, const char *root, int type) |
aae1f3c4 CS |
1333 | { |
1334 | size_t bufsz = strlen(root) + sizeof("/sys/fs/cgroup"); | |
1335 | char *path = NULL; | |
1336 | char **parts = NULL; | |
1337 | char *dirname = NULL; | |
1338 | char *abs_path = NULL; | |
1339 | char *abs_path2 = NULL; | |
d4ef7c50 SH |
1340 | struct cgfs_data *cgfs_d; |
1341 | struct cgroup_process_info *info, *base_info; | |
aae1f3c4 CS |
1342 | int r, saved_errno = 0; |
1343 | ||
4fb3cba5 DE |
1344 | cgfs_d = hdata; |
1345 | if (!cgfs_d) | |
1346 | return false; | |
d4ef7c50 SH |
1347 | base_info = cgfs_d->info; |
1348 | ||
0769b82a CS |
1349 | /* If we get passed the _NOSPEC types, we default to _MIXED, since we don't |
1350 | * have access to the lxc_conf object at this point. It really should be up | |
1351 | * to the caller to fix this, but this doesn't really hurt. | |
1352 | */ | |
1353 | if (type == LXC_AUTO_CGROUP_FULL_NOSPEC) | |
1354 | type = LXC_AUTO_CGROUP_FULL_MIXED; | |
1355 | else if (type == LXC_AUTO_CGROUP_NOSPEC) | |
1356 | type = LXC_AUTO_CGROUP_MIXED; | |
1357 | ||
7997d7da CS |
1358 | if (type < LXC_AUTO_CGROUP_RO || type > LXC_AUTO_CGROUP_FULL_MIXED) { |
1359 | ERROR("could not mount cgroups into container: invalid type specified internally"); | |
1360 | errno = EINVAL; | |
c476bdce | 1361 | return false; |
7997d7da CS |
1362 | } |
1363 | ||
aae1f3c4 CS |
1364 | path = calloc(1, bufsz); |
1365 | if (!path) | |
c476bdce | 1366 | return false; |
aae1f3c4 | 1367 | snprintf(path, bufsz, "%s/sys/fs/cgroup", root); |
592fd47a SH |
1368 | r = safe_mount("cgroup_root", path, "tmpfs", |
1369 | MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_RELATIME, | |
1370 | "size=10240k,mode=755", | |
1371 | root); | |
aae1f3c4 CS |
1372 | if (r < 0) { |
1373 | SYSERROR("could not mount tmpfs to /sys/fs/cgroup in the container"); | |
c476bdce | 1374 | return false; |
aae1f3c4 CS |
1375 | } |
1376 | ||
1377 | /* now mount all the hierarchies we care about */ | |
1378 | for (info = base_info; info; info = info->next) { | |
1379 | size_t subsystem_count, i; | |
1380 | struct cgroup_mount_point *mp = info->designated_mount_point; | |
1381 | if (!mp) | |
1382 | mp = lxc_cgroup_find_mount_point(info->hierarchy, info->cgroup_path, true); | |
1383 | if (!mp) { | |
1384 | SYSERROR("could not find original mount point for cgroup hierarchy while trying to mount cgroup filesystem"); | |
1385 | goto out_error; | |
1386 | } | |
1387 | ||
1388 | subsystem_count = lxc_array_len((void **)info->hierarchy->subsystems); | |
1389 | parts = calloc(subsystem_count + 1, sizeof(char *)); | |
1390 | if (!parts) | |
1391 | goto out_error; | |
1392 | ||
1393 | for (i = 0; i < subsystem_count; i++) { | |
1394 | if (!strncmp(info->hierarchy->subsystems[i], "name=", 5)) | |
1395 | parts[i] = info->hierarchy->subsystems[i] + 5; | |
1396 | else | |
1397 | parts[i] = info->hierarchy->subsystems[i]; | |
1398 | } | |
1399 | dirname = lxc_string_join(",", (const char **)parts, false); | |
1400 | if (!dirname) | |
1401 | goto out_error; | |
1402 | ||
1403 | /* create subsystem directory */ | |
1404 | abs_path = lxc_append_paths(path, dirname); | |
1405 | if (!abs_path) | |
1406 | goto out_error; | |
1407 | r = mkdir_p(abs_path, 0755); | |
1408 | if (r < 0 && errno != EEXIST) { | |
1409 | SYSERROR("could not create cgroup subsystem directory /sys/fs/cgroup/%s", dirname); | |
1410 | goto out_error; | |
1411 | } | |
1412 | ||
aae1f3c4 CS |
1413 | abs_path2 = lxc_append_paths(abs_path, info->cgroup_path); |
1414 | if (!abs_path2) | |
1415 | goto out_error; | |
aae1f3c4 | 1416 | |
7997d7da CS |
1417 | if (type == LXC_AUTO_CGROUP_FULL_RO || type == LXC_AUTO_CGROUP_FULL_RW || type == LXC_AUTO_CGROUP_FULL_MIXED) { |
1418 | /* bind-mount the cgroup entire filesystem there */ | |
1419 | if (strcmp(mp->mount_prefix, "/") != 0) { | |
1420 | /* FIXME: maybe we should just try to remount the entire hierarchy | |
1421 | * with a regular mount command? may that works? */ | |
1422 | ERROR("could not automatically mount cgroup-full to /sys/fs/cgroup/%s: host has no mount point for this cgroup filesystem that has access to the root cgroup", dirname); | |
1423 | goto out_error; | |
1424 | } | |
1425 | r = mount(mp->mount_point, abs_path, "none", MS_BIND, 0); | |
1426 | if (r < 0) { | |
1427 | SYSERROR("error bind-mounting %s to %s", mp->mount_point, abs_path); | |
1428 | goto out_error; | |
1429 | } | |
f8f3c3c0 SG |
1430 | /* main cgroup path should be read-only */ |
1431 | if (type == LXC_AUTO_CGROUP_FULL_RO || type == LXC_AUTO_CGROUP_FULL_MIXED) { | |
1432 | r = mount(NULL, abs_path, NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL); | |
1433 | if (r < 0) { | |
1434 | SYSERROR("error re-mounting %s readonly", abs_path); | |
1435 | goto out_error; | |
1436 | } | |
1437 | } | |
7997d7da CS |
1438 | /* own cgroup should be read-write */ |
1439 | if (type == LXC_AUTO_CGROUP_FULL_MIXED) { | |
1440 | r = mount(abs_path2, abs_path2, NULL, MS_BIND, NULL); | |
1441 | if (r < 0) { | |
1442 | SYSERROR("error bind-mounting %s onto itself", abs_path2); | |
1443 | goto out_error; | |
1444 | } | |
1445 | r = mount(NULL, abs_path2, NULL, MS_REMOUNT|MS_BIND, NULL); | |
1446 | if (r < 0) { | |
1447 | SYSERROR("error re-mounting %s readwrite", abs_path2); | |
1448 | goto out_error; | |
1449 | } | |
1450 | } | |
1451 | } else { | |
1452 | /* create path for container's cgroup */ | |
1453 | r = mkdir_p(abs_path2, 0755); | |
1454 | if (r < 0 && errno != EEXIST) { | |
1455 | SYSERROR("could not create cgroup directory /sys/fs/cgroup/%s%s", dirname, info->cgroup_path); | |
1456 | goto out_error; | |
1457 | } | |
aae1f3c4 | 1458 | |
b46f0553 CS |
1459 | /* for read-only and mixed cases, we have to bind-mount the tmpfs directory |
1460 | * that points to the hierarchy itself (i.e. /sys/fs/cgroup/cpu etc.) onto | |
1461 | * itself and then bind-mount it read-only, since we keep the tmpfs itself | |
1462 | * read-write (see comment below) | |
1463 | */ | |
1464 | if (type == LXC_AUTO_CGROUP_MIXED || type == LXC_AUTO_CGROUP_RO) { | |
1465 | r = mount(abs_path, abs_path, NULL, MS_BIND, NULL); | |
1466 | if (r < 0) { | |
1467 | SYSERROR("error bind-mounting %s onto itself", abs_path); | |
1468 | goto out_error; | |
1469 | } | |
1470 | r = mount(NULL, abs_path, NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL); | |
1471 | if (r < 0) { | |
1472 | SYSERROR("error re-mounting %s readonly", abs_path); | |
1473 | goto out_error; | |
1474 | } | |
1475 | } | |
1476 | ||
7997d7da CS |
1477 | free(abs_path); |
1478 | abs_path = NULL; | |
1479 | ||
1480 | /* bind-mount container's cgroup to that directory */ | |
1481 | abs_path = cgroup_to_absolute_path(mp, info->cgroup_path, NULL); | |
1482 | if (!abs_path) | |
1483 | goto out_error; | |
1484 | r = mount(abs_path, abs_path2, "none", MS_BIND, 0); | |
1485 | if (r < 0) { | |
1486 | SYSERROR("error bind-mounting %s to %s", abs_path, abs_path2); | |
1487 | goto out_error; | |
1488 | } | |
1489 | if (type == LXC_AUTO_CGROUP_RO) { | |
1490 | r = mount(NULL, abs_path2, NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL); | |
1491 | if (r < 0) { | |
1492 | SYSERROR("error re-mounting %s readonly", abs_path2); | |
1493 | goto out_error; | |
1494 | } | |
1495 | } | |
aae1f3c4 CS |
1496 | } |
1497 | ||
1498 | free(abs_path); | |
1499 | free(abs_path2); | |
1500 | abs_path = NULL; | |
1501 | abs_path2 = NULL; | |
1502 | ||
1503 | /* add symlinks for every single subsystem */ | |
1504 | if (subsystem_count > 1) { | |
1505 | for (i = 0; i < subsystem_count; i++) { | |
1506 | abs_path = lxc_append_paths(path, parts[i]); | |
1507 | if (!abs_path) | |
1508 | goto out_error; | |
1509 | r = symlink(dirname, abs_path); | |
1510 | if (r < 0) | |
1511 | WARN("could not create symlink %s -> %s in /sys/fs/cgroup of container", parts[i], dirname); | |
1512 | free(abs_path); | |
1513 | abs_path = NULL; | |
1514 | } | |
1515 | } | |
1516 | free(dirname); | |
1517 | free(parts); | |
1518 | dirname = NULL; | |
1519 | parts = NULL; | |
1520 | } | |
1521 | ||
b46f0553 CS |
1522 | /* We used to remount the entire tmpfs readonly if any :ro or |
1523 | * :mixed mode was specified. However, Ubuntu's mountall has the | |
1524 | * unfortunate behavior to block bootup if /sys/fs/cgroup is | |
1525 | * mounted read-only and cannot be remounted read-write. | |
1526 | * (mountall reads /lib/init/fstab and tries to (re-)mount all of | |
1527 | * these if they are not already mounted with the right options; | |
1528 | * it contains an entry for /sys/fs/cgroup. In case it can't do | |
1529 | * that, it prompts for the user to either manually fix it or | |
1530 | * boot anyway. But without user input, booting of the container | |
1531 | * hangs.) | |
1532 | * | |
1533 | * Instead of remounting the entire tmpfs readonly, we only | |
1534 | * remount the paths readonly that are part of the cgroup | |
1535 | * hierarchy. | |
f8f3c3c0 | 1536 | */ |
f8f3c3c0 | 1537 | |
aae1f3c4 CS |
1538 | free(path); |
1539 | ||
c476bdce | 1540 | return true; |
aae1f3c4 CS |
1541 | |
1542 | out_error: | |
1543 | saved_errno = errno; | |
1544 | free(path); | |
1545 | free(dirname); | |
1546 | free(parts); | |
1547 | free(abs_path); | |
1548 | free(abs_path2); | |
1549 | errno = saved_errno; | |
c476bdce | 1550 | return false; |
aae1f3c4 CS |
1551 | } |
1552 | ||
4fb3cba5 | 1553 | static int cgfs_nrtasks(void *hdata) |
33ad9f1a | 1554 | { |
4fb3cba5 DE |
1555 | struct cgfs_data *d = hdata; |
1556 | struct cgroup_process_info *info; | |
33ad9f1a CS |
1557 | struct cgroup_mount_point *mp = NULL; |
1558 | char *abs_path = NULL; | |
1559 | int ret; | |
460a1cf0 | 1560 | |
4fb3cba5 DE |
1561 | if (!d) { |
1562 | errno = ENOENT; | |
1563 | return -1; | |
1564 | } | |
1565 | ||
1566 | info = d->info; | |
33ad9f1a CS |
1567 | if (!info) { |
1568 | errno = ENOENT; | |
1569 | return -1; | |
b98f7d6e | 1570 | } |
c8f7c563 | 1571 | |
33ad9f1a | 1572 | if (info->designated_mount_point) { |
8900b9eb | 1573 | mp = info->designated_mount_point; |
33ad9f1a CS |
1574 | } else { |
1575 | mp = lxc_cgroup_find_mount_point(info->hierarchy, info->cgroup_path, false); | |
1576 | if (!mp) | |
1577 | return -1; | |
c8f7c563 CS |
1578 | } |
1579 | ||
33ad9f1a CS |
1580 | abs_path = cgroup_to_absolute_path(mp, info->cgroup_path, NULL); |
1581 | if (!abs_path) | |
1582 | return -1; | |
1583 | ||
1584 | ret = cgroup_recursive_task_count(abs_path); | |
1585 | free(abs_path); | |
1586 | return ret; | |
c8f7c563 CS |
1587 | } |
1588 | ||
574c4428 QH |
1589 | static struct cgroup_process_info * |
1590 | lxc_cgroup_process_info_getx(const char *proc_pid_cgroup_str, | |
1591 | struct cgroup_meta_data *meta) | |
d08ba6ec | 1592 | { |
33ad9f1a CS |
1593 | struct cgroup_process_info *result = NULL; |
1594 | FILE *proc_pid_cgroup = NULL; | |
1595 | char *line = NULL; | |
1596 | size_t sz = 0; | |
1597 | int saved_errno = 0; | |
1598 | struct cgroup_process_info **cptr = &result; | |
1599 | struct cgroup_process_info *entry = NULL; | |
1600 | ||
1601 | proc_pid_cgroup = fopen_cloexec(proc_pid_cgroup_str, "r"); | |
1602 | if (!proc_pid_cgroup) | |
b98f7d6e | 1603 | return NULL; |
1ac470c0 | 1604 | |
33ad9f1a CS |
1605 | while (getline(&line, &sz, proc_pid_cgroup) != -1) { |
1606 | /* file format: hierarchy:subsystems:group */ | |
1607 | char *colon1; | |
1608 | char *colon2; | |
1609 | char *endptr; | |
1610 | int hierarchy_number; | |
1611 | struct cgroup_hierarchy *h = NULL; | |
fd4f5a56 | 1612 | |
33ad9f1a | 1613 | if (!line[0]) |
ae5c8b8e | 1614 | continue; |
b98f7d6e | 1615 | |
33ad9f1a CS |
1616 | if (line[strlen(line) - 1] == '\n') |
1617 | line[strlen(line) - 1] = '\0'; | |
1618 | ||
1619 | colon1 = strchr(line, ':'); | |
1620 | if (!colon1) | |
8900b9eb | 1621 | continue; |
33ad9f1a CS |
1622 | *colon1++ = '\0'; |
1623 | colon2 = strchr(colon1, ':'); | |
1624 | if (!colon2) | |
ae5c8b8e | 1625 | continue; |
33ad9f1a | 1626 | *colon2++ = '\0'; |
e4659536 | 1627 | |
33ad9f1a CS |
1628 | endptr = NULL; |
1629 | hierarchy_number = strtoul(line, &endptr, 10); | |
1630 | if (!endptr || *endptr) | |
9a93d992 | 1631 | continue; |
9a93d992 | 1632 | |
33ad9f1a CS |
1633 | if (hierarchy_number > meta->maximum_hierarchy) { |
1634 | /* we encountered a hierarchy we didn't have before, | |
1635 | * so probably somebody remounted some stuff in the | |
1636 | * mean time... | |
1637 | */ | |
1638 | errno = EAGAIN; | |
1639 | goto out_error; | |
b98f7d6e | 1640 | } |
33ad9f1a CS |
1641 | |
1642 | h = meta->hierarchies[hierarchy_number]; | |
1643 | if (!h) { | |
1644 | /* we encountered a hierarchy that was thought to be | |
1645 | * dead before, so probably somebody remounted some | |
1646 | * stuff in the mean time... | |
1647 | */ | |
1648 | errno = EAGAIN; | |
1649 | goto out_error; | |
b98f7d6e | 1650 | } |
33ad9f1a CS |
1651 | |
1652 | /* we are told that we should ignore this hierarchy */ | |
1653 | if (!h->used) | |
b98f7d6e | 1654 | continue; |
5193cc3d | 1655 | |
33ad9f1a CS |
1656 | entry = calloc(1, sizeof(struct cgroup_process_info)); |
1657 | if (!entry) | |
1658 | goto out_error; | |
fd4f5a56 | 1659 | |
33ad9f1a CS |
1660 | entry->meta_ref = lxc_cgroup_get_meta(meta); |
1661 | entry->hierarchy = h; | |
1662 | entry->cgroup_path = strdup(colon2); | |
1663 | if (!entry->cgroup_path) | |
1664 | goto out_error; | |
3939a22a | 1665 | prune_init_scope(entry->cgroup_path); |
d08ba6ec | 1666 | |
33ad9f1a CS |
1667 | *cptr = entry; |
1668 | cptr = &entry->next; | |
1669 | entry = NULL; | |
b98f7d6e | 1670 | } |
b98f7d6e | 1671 | |
33ad9f1a CS |
1672 | fclose(proc_pid_cgroup); |
1673 | free(line); | |
1674 | return result; | |
1675 | ||
1676 | out_error: | |
1677 | saved_errno = errno; | |
1678 | if (proc_pid_cgroup) | |
1679 | fclose(proc_pid_cgroup); | |
1680 | lxc_cgroup_process_info_free(result); | |
1681 | lxc_cgroup_process_info_free(entry); | |
1682 | free(line); | |
1683 | errno = saved_errno; | |
ae5c8b8e | 1684 | return NULL; |
36b86299 DL |
1685 | } |
1686 | ||
574c4428 QH |
1687 | static char **subsystems_from_mount_options(const char *mount_options, |
1688 | char **kernel_list) | |
36b86299 | 1689 | { |
33ad9f1a CS |
1690 | char *token, *str, *saveptr = NULL; |
1691 | char **result = NULL; | |
1692 | size_t result_capacity = 0; | |
8900b9eb | 1693 | size_t result_count = 0; |
33ad9f1a CS |
1694 | int saved_errno; |
1695 | int r; | |
ef342abb | 1696 | |
33ad9f1a CS |
1697 | str = alloca(strlen(mount_options)+1); |
1698 | strcpy(str, mount_options); | |
1699 | for (; (token = strtok_r(str, ",", &saveptr)); str = NULL) { | |
1700 | /* we have a subsystem if it's either in the list of | |
1701 | * subsystems provided by the kernel OR if it starts | |
1702 | * with name= for named hierarchies | |
1703 | */ | |
1704 | if (!strncmp(token, "name=", 5) || lxc_string_in_array(token, (const char **)kernel_list)) { | |
1705 | r = lxc_grow_array((void ***)&result, &result_capacity, result_count + 1, 12); | |
1706 | if (r < 0) | |
1707 | goto out_free; | |
1708 | result[result_count + 1] = NULL; | |
1709 | result[result_count] = strdup(token); | |
1710 | if (!result[result_count]) | |
1711 | goto out_free; | |
1712 | result_count++; | |
1713 | } | |
ae5c8b8e | 1714 | } |
f0e64b8b | 1715 | |
33ad9f1a CS |
1716 | return result; |
1717 | ||
1718 | out_free: | |
1719 | saved_errno = errno; | |
1720 | lxc_free_array((void**)result, free); | |
1721 | errno = saved_errno; | |
1722 | return NULL; | |
b98f7d6e SH |
1723 | } |
1724 | ||
574c4428 | 1725 | static void lxc_cgroup_mount_point_free(struct cgroup_mount_point *mp) |
b98f7d6e | 1726 | { |
33ad9f1a CS |
1727 | if (!mp) |
1728 | return; | |
1729 | free(mp->mount_point); | |
1730 | free(mp->mount_prefix); | |
1731 | free(mp); | |
bcbd102c SH |
1732 | } |
1733 | ||
574c4428 | 1734 | static void lxc_cgroup_hierarchy_free(struct cgroup_hierarchy *h) |
341a9bd8 | 1735 | { |
33ad9f1a CS |
1736 | if (!h) |
1737 | return; | |
1738 | lxc_free_array((void **)h->subsystems, free); | |
8bfcb981 | 1739 | free(h->all_mount_points); |
33ad9f1a CS |
1740 | free(h); |
1741 | } | |
341a9bd8 | 1742 | |
574c4428 | 1743 | static bool is_valid_cgroup(const char *name) |
33ad9f1a CS |
1744 | { |
1745 | const char *p; | |
1746 | for (p = name; *p; p++) { | |
28bb9321 QH |
1747 | /* Use the ASCII printable characters range(32 - 127) |
1748 | * is reasonable, we kick out 32(SPACE) because it'll | |
1749 | * break legacy lxc-ls | |
1750 | */ | |
1751 | if (*p <= 32 || *p >= 127 || *p == '/') | |
33ad9f1a | 1752 | return false; |
341a9bd8 | 1753 | } |
33ad9f1a CS |
1754 | return strcmp(name, ".") != 0 && strcmp(name, "..") != 0; |
1755 | } | |
341a9bd8 | 1756 | |
574c4428 QH |
1757 | static int create_or_remove_cgroup(bool do_remove, |
1758 | struct cgroup_mount_point *mp, const char *path, int recurse) | |
33ad9f1a CS |
1759 | { |
1760 | int r, saved_errno = 0; | |
1761 | char *buf = cgroup_to_absolute_path(mp, path, NULL); | |
1762 | if (!buf) | |
1763 | return -1; | |
341a9bd8 | 1764 | |
33ad9f1a | 1765 | /* create or remove directory */ |
603c64c2 SH |
1766 | if (do_remove) { |
1767 | if (recurse) | |
1768 | r = cgroup_rmdir(buf); | |
1769 | else | |
1770 | r = rmdir(buf); | |
1771 | } else | |
1772 | r = mkdir(buf, 0777); | |
33ad9f1a CS |
1773 | saved_errno = errno; |
1774 | free(buf); | |
1775 | errno = saved_errno; | |
1776 | return r; | |
341a9bd8 | 1777 | } |
bcbd102c | 1778 | |
574c4428 | 1779 | static int create_cgroup(struct cgroup_mount_point *mp, const char *path) |
a6ddef61 | 1780 | { |
603c64c2 | 1781 | return create_or_remove_cgroup(false, mp, path, false); |
a6ddef61 MN |
1782 | } |
1783 | ||
574c4428 QH |
1784 | static int remove_cgroup(struct cgroup_mount_point *mp, |
1785 | const char *path, bool recurse) | |
576f946d | 1786 | { |
603c64c2 | 1787 | return create_or_remove_cgroup(true, mp, path, recurse); |
33ad9f1a | 1788 | } |
576f946d | 1789 | |
574c4428 QH |
1790 | static char *cgroup_to_absolute_path(struct cgroup_mount_point *mp, |
1791 | const char *path, const char *suffix) | |
33ad9f1a CS |
1792 | { |
1793 | /* first we have to make sure we subtract the mount point's prefix */ | |
1794 | char *prefix = mp->mount_prefix; | |
1795 | char *buf; | |
1796 | ssize_t len, rv; | |
1797 | ||
1798 | /* we want to make sure only absolute paths to cgroups are passed to us */ | |
1799 | if (path[0] != '/') { | |
1800 | errno = EINVAL; | |
1801 | return NULL; | |
1802 | } | |
b98f7d6e | 1803 | |
33ad9f1a CS |
1804 | if (prefix && !strcmp(prefix, "/")) |
1805 | prefix = NULL; | |
b98f7d6e | 1806 | |
33ad9f1a CS |
1807 | /* prefix doesn't match */ |
1808 | if (prefix && strncmp(prefix, path, strlen(prefix)) != 0) { | |
1809 | errno = EINVAL; | |
1810 | return NULL; | |
1811 | } | |
1812 | /* if prefix is /foo and path is /foobar */ | |
1813 | if (prefix && path[strlen(prefix)] != '/' && path[strlen(prefix)] != '\0') { | |
1814 | errno = EINVAL; | |
1815 | return NULL; | |
1816 | } | |
b98f7d6e | 1817 | |
33ad9f1a CS |
1818 | /* remove prefix from path */ |
1819 | path += prefix ? strlen(prefix) : 0; | |
b98f7d6e | 1820 | |
33ad9f1a CS |
1821 | len = strlen(mp->mount_point) + strlen(path) + (suffix ? strlen(suffix) : 0); |
1822 | buf = calloc(len + 1, 1); | |
50266dc6 DE |
1823 | if (!buf) |
1824 | return NULL; | |
33ad9f1a | 1825 | rv = snprintf(buf, len + 1, "%s%s%s", mp->mount_point, path, suffix ? suffix : ""); |
8900b9eb | 1826 | if (rv > len) { |
33ad9f1a CS |
1827 | free(buf); |
1828 | errno = ENOMEM; | |
8900b9eb | 1829 | return NULL; |
8b92dc3a | 1830 | } |
576f946d | 1831 | |
33ad9f1a | 1832 | return buf; |
e0f888d9 | 1833 | } |
283678ed | 1834 | |
574c4428 QH |
1835 | static struct cgroup_process_info * |
1836 | find_info_for_subsystem(struct cgroup_process_info *info, const char *subsystem) | |
283678ed | 1837 | { |
33ad9f1a CS |
1838 | struct cgroup_process_info *info_ptr; |
1839 | for (info_ptr = info; info_ptr; info_ptr = info_ptr->next) { | |
1840 | struct cgroup_hierarchy *h = info_ptr->hierarchy; | |
1841 | if (lxc_string_in_array(subsystem, (const char **)h->subsystems)) | |
1842 | return info_ptr; | |
b98f7d6e | 1843 | } |
33ad9f1a CS |
1844 | errno = ENOENT; |
1845 | return NULL; | |
1846 | } | |
283678ed | 1847 | |
574c4428 QH |
1848 | static int do_cgroup_get(const char *cgroup_path, const char *sub_filename, |
1849 | char *value, size_t len) | |
33ad9f1a CS |
1850 | { |
1851 | const char *parts[3] = { | |
1852 | cgroup_path, | |
1853 | sub_filename, | |
1854 | NULL | |
1855 | }; | |
1856 | char *filename; | |
1857 | int ret, saved_errno; | |
1858 | ||
1859 | filename = lxc_string_join("/", parts, false); | |
1860 | if (!filename) | |
1861 | return -1; | |
1862 | ||
1863 | ret = lxc_read_from_file(filename, value, len); | |
1864 | saved_errno = errno; | |
1865 | free(filename); | |
1866 | errno = saved_errno; | |
1867 | return ret; | |
283678ed | 1868 | } |
b113383b | 1869 | |
574c4428 QH |
1870 | static int do_cgroup_set(const char *cgroup_path, const char *sub_filename, |
1871 | const char *value) | |
b113383b | 1872 | { |
33ad9f1a CS |
1873 | const char *parts[3] = { |
1874 | cgroup_path, | |
1875 | sub_filename, | |
1876 | NULL | |
1877 | }; | |
1878 | char *filename; | |
1879 | int ret, saved_errno; | |
b113383b | 1880 | |
33ad9f1a CS |
1881 | filename = lxc_string_join("/", parts, false); |
1882 | if (!filename) | |
1883 | return -1; | |
b113383b | 1884 | |
33ad9f1a CS |
1885 | ret = lxc_write_to_file(filename, value, strlen(value), false); |
1886 | saved_errno = errno; | |
1887 | free(filename); | |
1888 | errno = saved_errno; | |
1889 | return ret; | |
b98f7d6e SH |
1890 | } |
1891 | ||
4fb3cba5 | 1892 | static int do_setup_cgroup_limits(struct cgfs_data *d, |
574c4428 | 1893 | struct lxc_list *cgroup_settings, bool do_devices) |
b98f7d6e | 1894 | { |
365d180a | 1895 | struct lxc_list *iterator, *sorted_cgroup_settings, *next; |
b98f7d6e SH |
1896 | struct lxc_cgroup *cg; |
1897 | int ret = -1; | |
1898 | ||
33ad9f1a | 1899 | if (lxc_list_empty(cgroup_settings)) |
b98f7d6e SH |
1900 | return 0; |
1901 | ||
aaf26830 | 1902 | sorted_cgroup_settings = sort_cgroup_settings(cgroup_settings); |
fac7c663 KT |
1903 | if (!sorted_cgroup_settings) { |
1904 | return -1; | |
1905 | } | |
aaf26830 KT |
1906 | |
1907 | lxc_list_for_each(iterator, sorted_cgroup_settings) { | |
b98f7d6e SH |
1908 | cg = iterator->elem; |
1909 | ||
33ad9f1a | 1910 | if (do_devices == !strncmp("devices", cg->subsystem, 7)) { |
b98f7d6e | 1911 | if (strcmp(cg->subsystem, "devices.deny") == 0 && |
4fb3cba5 | 1912 | cgroup_devices_has_allow_or_deny(d, cg->value, false)) |
b98f7d6e SH |
1913 | continue; |
1914 | if (strcmp(cg->subsystem, "devices.allow") == 0 && | |
4fb3cba5 | 1915 | cgroup_devices_has_allow_or_deny(d, cg->value, true)) |
b98f7d6e | 1916 | continue; |
4fb3cba5 | 1917 | if (lxc_cgroup_set_data(cg->subsystem, cg->value, d)) { |
959aee9c | 1918 | ERROR("Error setting %s to %s for %s", |
4fb3cba5 | 1919 | cg->subsystem, cg->value, d->name); |
b98f7d6e SH |
1920 | goto out; |
1921 | } | |
b113383b | 1922 | } |
b98f7d6e SH |
1923 | |
1924 | DEBUG("cgroup '%s' set to '%s'", cg->subsystem, cg->value); | |
b113383b SH |
1925 | } |
1926 | ||
b98f7d6e SH |
1927 | ret = 0; |
1928 | INFO("cgroup has been setup"); | |
1929 | out: | |
365d180a | 1930 | lxc_list_for_each_safe(iterator, sorted_cgroup_settings, next) { |
aaf26830 KT |
1931 | lxc_list_del(iterator); |
1932 | free(iterator); | |
1933 | } | |
365d180a | 1934 | free(sorted_cgroup_settings); |
b113383b SH |
1935 | return ret; |
1936 | } | |
b98f7d6e | 1937 | |
4fb3cba5 | 1938 | static bool cgroup_devices_has_allow_or_deny(struct cgfs_data *d, |
574c4428 | 1939 | char *v, bool for_allow) |
33ad9f1a CS |
1940 | { |
1941 | char *path; | |
1942 | FILE *devices_list; | |
8900b9eb | 1943 | char *line = NULL; |
33ad9f1a CS |
1944 | size_t sz = 0; |
1945 | bool ret = !for_allow; | |
1946 | const char *parts[3] = { | |
1947 | NULL, | |
1948 | "devices.list", | |
1949 | NULL | |
1950 | }; | |
1951 | ||
1952 | // XXX FIXME if users could use something other than 'lxc.devices.deny = a'. | |
1953 | // not sure they ever do, but they *could* | |
1954 | // right now, I'm assuming they do NOT | |
1955 | if (!for_allow && strcmp(v, "a") != 0 && strcmp(v, "a *:* rwm") != 0) | |
1956 | return false; | |
1957 | ||
4fb3cba5 | 1958 | parts[0] = (const char *)lxc_cgroup_get_hierarchy_abs_path_data("devices", d); |
33ad9f1a CS |
1959 | if (!parts[0]) |
1960 | return false; | |
1961 | path = lxc_string_join("/", parts, false); | |
1962 | if (!path) { | |
1963 | free((void *)parts[0]); | |
1964 | return false; | |
1965 | } | |
1966 | ||
1967 | devices_list = fopen_cloexec(path, "r"); | |
1968 | if (!devices_list) { | |
1969 | free(path); | |
1970 | return false; | |
1971 | } | |
1972 | ||
1973 | while (getline(&line, &sz, devices_list) != -1) { | |
1974 | size_t len = strlen(line); | |
1975 | if (len > 0 && line[len-1] == '\n') | |
1976 | line[len-1] = '\0'; | |
1977 | if (strcmp(line, "a *:* rwm") == 0) { | |
1978 | ret = for_allow; | |
1979 | goto out; | |
1980 | } else if (for_allow && strcmp(line, v) == 0) { | |
1981 | ret = true; | |
8900b9eb | 1982 | goto out; |
33ad9f1a CS |
1983 | } |
1984 | } | |
1985 | ||
1986 | out: | |
1987 | fclose(devices_list); | |
1988 | free(line); | |
1989 | free(path); | |
1990 | return ret; | |
1991 | } | |
1992 | ||
574c4428 | 1993 | static int cgroup_recursive_task_count(const char *cgroup_path) |
b98f7d6e | 1994 | { |
33ad9f1a CS |
1995 | DIR *d; |
1996 | struct dirent *dent_buf; | |
1997 | struct dirent *dent; | |
8900b9eb | 1998 | ssize_t name_max; |
33ad9f1a CS |
1999 | int n = 0, r; |
2000 | ||
2001 | /* see man readdir_r(3) */ | |
2002 | name_max = pathconf(cgroup_path, _PC_NAME_MAX); | |
2003 | if (name_max <= 0) | |
2004 | name_max = 255; | |
2005 | dent_buf = malloc(offsetof(struct dirent, d_name) + name_max + 1); | |
2006 | if (!dent_buf) | |
2007 | return -1; | |
2008 | ||
2009 | d = opendir(cgroup_path); | |
034ef75d SH |
2010 | if (!d) { |
2011 | free(dent_buf); | |
33ad9f1a | 2012 | return 0; |
034ef75d | 2013 | } |
33ad9f1a CS |
2014 | |
2015 | while (readdir_r(d, dent_buf, &dent) == 0 && dent) { | |
2016 | const char *parts[3] = { | |
2017 | cgroup_path, | |
2018 | dent->d_name, | |
2019 | NULL | |
2020 | }; | |
2021 | char *sub_path; | |
2022 | struct stat st; | |
2023 | ||
2024 | if (!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, "..")) | |
2025 | continue; | |
2026 | sub_path = lxc_string_join("/", parts, false); | |
2027 | if (!sub_path) { | |
2028 | closedir(d); | |
2029 | free(dent_buf); | |
2030 | return -1; | |
2031 | } | |
2032 | r = stat(sub_path, &st); | |
2033 | if (r < 0) { | |
2034 | closedir(d); | |
2035 | free(dent_buf); | |
2036 | free(sub_path); | |
2037 | return -1; | |
2038 | } | |
2039 | if (S_ISDIR(st.st_mode)) { | |
2040 | r = cgroup_recursive_task_count(sub_path); | |
2041 | if (r >= 0) | |
2042 | n += r; | |
2043 | } else if (!strcmp(dent->d_name, "tasks")) { | |
2044 | r = count_lines(sub_path); | |
2045 | if (r >= 0) | |
2046 | n += r; | |
2047 | } | |
2048 | free(sub_path); | |
2049 | } | |
2050 | closedir(d); | |
2051 | free(dent_buf); | |
2052 | ||
2053 | return n; | |
2054 | } | |
2055 | ||
574c4428 | 2056 | static int count_lines(const char *fn) |
33ad9f1a CS |
2057 | { |
2058 | FILE *f; | |
2059 | char *line = NULL; | |
2060 | size_t sz = 0; | |
2061 | int n = 0; | |
2062 | ||
2063 | f = fopen_cloexec(fn, "r"); | |
2064 | if (!f) | |
2065 | return -1; | |
2066 | ||
2067 | while (getline(&line, &sz, f) != -1) { | |
2068 | n++; | |
2069 | } | |
2070 | free(line); | |
2071 | fclose(f); | |
2072 | return n; | |
b98f7d6e SH |
2073 | } |
2074 | ||
574c4428 QH |
2075 | static int handle_cgroup_settings(struct cgroup_mount_point *mp, |
2076 | char *cgroup_path) | |
b98f7d6e | 2077 | { |
33ad9f1a | 2078 | int r, saved_errno = 0; |
7e7243e1 | 2079 | char buf[2]; |
1ea59ad2 | 2080 | |
934b1673 SH |
2081 | mp->need_cpuset_init = false; |
2082 | ||
1ea59ad2 SH |
2083 | /* If this is the memory cgroup, we want to enforce hierarchy. |
2084 | * But don't fail if for some reason we can't. | |
2085 | */ | |
2edb53c7 SH |
2086 | if (lxc_string_in_array("memory", (const char **)mp->hierarchy->subsystems)) { |
2087 | char *cc_path = cgroup_to_absolute_path(mp, cgroup_path, "/memory.use_hierarchy"); | |
2088 | if (cc_path) { | |
2089 | r = lxc_read_from_file(cc_path, buf, 1); | |
2090 | if (r < 1 || buf[0] != '1') { | |
2091 | r = lxc_write_to_file(cc_path, "1", 1, false); | |
2092 | if (r < 0) | |
a8916143 | 2093 | SYSERROR("failed to set memory.use_hierarchy to 1; continuing"); |
2edb53c7 | 2094 | } |
1ea59ad2 SH |
2095 | free(cc_path); |
2096 | } | |
2edb53c7 | 2097 | } |
1ea59ad2 | 2098 | |
33ad9f1a CS |
2099 | /* if this is a cpuset hierarchy, we have to set cgroup.clone_children in |
2100 | * the base cgroup, otherwise containers will start with an empty cpuset.mems | |
2101 | * and cpuset.cpus and then | |
2102 | */ | |
2edb53c7 SH |
2103 | if (lxc_string_in_array("cpuset", (const char **)mp->hierarchy->subsystems)) { |
2104 | char *cc_path = cgroup_to_absolute_path(mp, cgroup_path, "/cgroup.clone_children"); | |
d703c2b1 RV |
2105 | struct stat sb; |
2106 | ||
33ad9f1a | 2107 | if (!cc_path) |
2edb53c7 | 2108 | return -1; |
d703c2b1 RV |
2109 | /* cgroup.clone_children is not available when running under |
2110 | * older kernel versions; in this case, we'll initialize | |
2111 | * cpuset.cpus and cpuset.mems later, after the new cgroup | |
2112 | * was created | |
2113 | */ | |
2114 | if (stat(cc_path, &sb) != 0 && errno == ENOENT) { | |
934b1673 | 2115 | mp->need_cpuset_init = true; |
d703c2b1 RV |
2116 | free(cc_path); |
2117 | return 0; | |
2118 | } | |
7e7243e1 SH |
2119 | r = lxc_read_from_file(cc_path, buf, 1); |
2120 | if (r == 1 && buf[0] == '1') { | |
2121 | free(cc_path); | |
2edb53c7 | 2122 | return 0; |
7e7243e1 | 2123 | } |
33ad9f1a | 2124 | r = lxc_write_to_file(cc_path, "1", 1, false); |
2edb53c7 SH |
2125 | saved_errno = errno; |
2126 | free(cc_path); | |
2127 | errno = saved_errno; | |
2128 | return r < 0 ? -1 : 0; | |
33ad9f1a CS |
2129 | } |
2130 | return 0; | |
b98f7d6e | 2131 | } |
484ed030 | 2132 | |
934b1673 | 2133 | static int cgroup_read_from_file(const char *fn, char buf[], size_t bufsize) |
d703c2b1 RV |
2134 | { |
2135 | int ret = lxc_read_from_file(fn, buf, bufsize); | |
2136 | if (ret < 0) { | |
2137 | SYSERROR("failed to read %s", fn); | |
934b1673 | 2138 | return ret; |
d703c2b1 RV |
2139 | } |
2140 | if (ret == bufsize) { | |
934b1673 SH |
2141 | if (bufsize > 0) { |
2142 | /* obviously this wasn't empty */ | |
2143 | buf[bufsize-1] = '\0'; | |
2144 | return ret; | |
2145 | } | |
2146 | /* Callers don't do this, but regression/sanity check */ | |
2147 | ERROR("%s: was not expecting 0 bufsize", __func__); | |
2148 | return -1; | |
d703c2b1 RV |
2149 | } |
2150 | buf[ret] = '\0'; | |
934b1673 | 2151 | return ret; |
d703c2b1 RV |
2152 | } |
2153 | ||
2154 | static bool do_init_cpuset_file(struct cgroup_mount_point *mp, | |
2155 | const char *path, const char *name) | |
2156 | { | |
934b1673 SH |
2157 | char value[1024]; |
2158 | char *childfile, *parentfile = NULL, *tmp; | |
2159 | int ret; | |
2160 | bool ok = false; | |
2161 | ||
d703c2b1 RV |
2162 | childfile = cgroup_to_absolute_path(mp, path, name); |
2163 | if (!childfile) | |
2164 | return false; | |
2165 | ||
2166 | /* don't overwrite a non-empty value in the file */ | |
934b1673 SH |
2167 | ret = cgroup_read_from_file(childfile, value, sizeof(value)); |
2168 | if (ret < 0) | |
2169 | goto out; | |
d703c2b1 | 2170 | if (value[0] != '\0' && value[0] != '\n') { |
934b1673 SH |
2171 | ok = true; |
2172 | goto out; | |
d703c2b1 RV |
2173 | } |
2174 | ||
2175 | /* path to the same name in the parent cgroup */ | |
2176 | parentfile = strdup(path); | |
2177 | if (!parentfile) | |
934b1673 SH |
2178 | goto out; |
2179 | ||
d703c2b1 | 2180 | tmp = strrchr(parentfile, '/'); |
934b1673 SH |
2181 | if (!tmp) |
2182 | goto out; | |
d703c2b1 RV |
2183 | if (tmp == parentfile) |
2184 | tmp++; /* keep the '/' at the start */ | |
2185 | *tmp = '\0'; | |
2186 | tmp = parentfile; | |
2187 | parentfile = cgroup_to_absolute_path(mp, tmp, name); | |
2188 | free(tmp); | |
934b1673 SH |
2189 | if (!parentfile) |
2190 | goto out; | |
d703c2b1 RV |
2191 | |
2192 | /* copy from parent to child cgroup */ | |
934b1673 SH |
2193 | ret = cgroup_read_from_file(parentfile, value, sizeof(value)); |
2194 | if (ret < 0) | |
2195 | goto out; | |
2196 | if (ret == sizeof(value)) { | |
2197 | /* If anyone actually sees this error, we can address it */ | |
2198 | ERROR("parent cpuset value too long"); | |
2199 | goto out; | |
d703c2b1 RV |
2200 | } |
2201 | ok = (lxc_write_to_file(childfile, value, strlen(value), false) >= 0); | |
2202 | if (!ok) | |
2203 | SYSERROR("failed writing %s", childfile); | |
b1dad6f6 RV |
2204 | |
2205 | out: | |
f10fad2f | 2206 | free(parentfile); |
d703c2b1 | 2207 | free(childfile); |
d703c2b1 RV |
2208 | return ok; |
2209 | } | |
2210 | ||
2211 | static bool init_cpuset_if_needed(struct cgroup_mount_point *mp, | |
2212 | const char *path) | |
2213 | { | |
2214 | /* the files we have to handle here are only in cpuset hierarchies */ | |
2215 | if (!lxc_string_in_array("cpuset", | |
2216 | (const char **)mp->hierarchy->subsystems)) | |
2217 | return true; | |
2218 | ||
b1dad6f6 RV |
2219 | if (!mp->need_cpuset_init) |
2220 | return true; | |
2221 | ||
d703c2b1 RV |
2222 | return (do_init_cpuset_file(mp, path, "/cpuset.cpus") && |
2223 | do_init_cpuset_file(mp, path, "/cpuset.mems") ); | |
2224 | } | |
2225 | ||
4fb3cba5 | 2226 | struct cgroup_ops *cgfs_ops_init(void) |
484ed030 | 2227 | { |
4fb3cba5 | 2228 | return &cgfs_ops; |
d4ef7c50 | 2229 | } |
484ed030 | 2230 | |
4fb3cba5 | 2231 | static void *cgfs_init(const char *name) |
d4ef7c50 | 2232 | { |
4fb3cba5 | 2233 | struct cgfs_data *d; |
484ed030 | 2234 | |
4fb3cba5 DE |
2235 | d = malloc(sizeof(*d)); |
2236 | if (!d) | |
2237 | return NULL; | |
484ed030 | 2238 | |
4fb3cba5 DE |
2239 | memset(d, 0, sizeof(*d)); |
2240 | d->name = strdup(name); | |
2241 | if (!d->name) | |
2242 | goto err1; | |
2243 | ||
5e1c5795 | 2244 | d->cgroup_pattern = lxc_global_config_value("lxc.cgroup.pattern"); |
4fb3cba5 DE |
2245 | |
2246 | d->meta = lxc_cgroup_load_meta(); | |
2247 | if (!d->meta) { | |
2248 | ERROR("cgroupfs failed to detect cgroup metadata"); | |
2249 | goto err2; | |
2250 | } | |
2251 | return d; | |
2252 | ||
2253 | err2: | |
2254 | free(d->name); | |
2255 | err1: | |
2256 | free(d); | |
2257 | return NULL; | |
d4ef7c50 | 2258 | } |
484ed030 | 2259 | |
4fb3cba5 | 2260 | static void cgfs_destroy(void *hdata) |
d4ef7c50 | 2261 | { |
4fb3cba5 DE |
2262 | struct cgfs_data *d = hdata; |
2263 | ||
d4ef7c50 SH |
2264 | if (!d) |
2265 | return; | |
f10fad2f | 2266 | free(d->name); |
c55d4505 ME |
2267 | lxc_cgroup_process_info_free_and_remove(d->info); |
2268 | lxc_cgroup_put_meta(d->meta); | |
d4ef7c50 | 2269 | free(d); |
d4ef7c50 | 2270 | } |
484ed030 | 2271 | |
4fb3cba5 | 2272 | static inline bool cgfs_create(void *hdata) |
d4ef7c50 | 2273 | { |
4fb3cba5 DE |
2274 | struct cgfs_data *d = hdata; |
2275 | struct cgroup_process_info *i; | |
2276 | struct cgroup_meta_data *md; | |
484ed030 | 2277 | |
4fb3cba5 | 2278 | if (!d) |
d4ef7c50 | 2279 | return false; |
4fb3cba5 DE |
2280 | md = d->meta; |
2281 | i = lxc_cgroupfs_create(d->name, d->cgroup_pattern, md, NULL); | |
d4ef7c50 SH |
2282 | if (!i) |
2283 | return false; | |
2284 | d->info = i; | |
2285 | return true; | |
2286 | } | |
484ed030 | 2287 | |
4fb3cba5 | 2288 | static inline bool cgfs_enter(void *hdata, pid_t pid) |
d4ef7c50 | 2289 | { |
4fb3cba5 DE |
2290 | struct cgfs_data *d = hdata; |
2291 | struct cgroup_process_info *i; | |
d4ef7c50 | 2292 | int ret; |
4fb3cba5 DE |
2293 | |
2294 | if (!d) | |
2295 | return false; | |
2296 | i = d->info; | |
2297 | ret = lxc_cgroupfs_enter(i, pid, false); | |
484ed030 | 2298 | |
d4ef7c50 SH |
2299 | return ret == 0; |
2300 | } | |
2301 | ||
4fb3cba5 | 2302 | static inline bool cgfs_create_legacy(void *hdata, pid_t pid) |
d4ef7c50 | 2303 | { |
4fb3cba5 DE |
2304 | struct cgfs_data *d = hdata; |
2305 | struct cgroup_process_info *i; | |
2306 | ||
2307 | if (!d) | |
2308 | return false; | |
2309 | i = d->info; | |
2310 | if (lxc_cgroup_create_legacy(i, d->name, pid) < 0) { | |
2311 | ERROR("failed to create legacy ns cgroups for '%s'", d->name); | |
d4ef7c50 | 2312 | return false; |
484ed030 | 2313 | } |
d4ef7c50 SH |
2314 | return true; |
2315 | } | |
484ed030 | 2316 | |
4fb3cba5 | 2317 | static const char *cgfs_get_cgroup(void *hdata, const char *subsystem) |
d4ef7c50 | 2318 | { |
4fb3cba5 DE |
2319 | struct cgfs_data *d = hdata; |
2320 | ||
2321 | if (!d) | |
2322 | return NULL; | |
2323 | return lxc_cgroup_get_hierarchy_path_data(subsystem, d); | |
484ed030 SH |
2324 | } |
2325 | ||
2ba7a429 TA |
2326 | static const char *cgfs_canonical_path(void *hdata) |
2327 | { | |
2328 | struct cgfs_data *d = hdata; | |
2329 | struct cgroup_process_info *info_ptr; | |
2330 | char *path = NULL; | |
2331 | ||
2332 | if (!d) | |
2333 | return NULL; | |
2334 | ||
2335 | for (info_ptr = d->info; info_ptr; info_ptr = info_ptr->next) { | |
2336 | if (!path) | |
2337 | path = info_ptr->cgroup_path; | |
2338 | else if (strcmp(path, info_ptr->cgroup_path) != 0) { | |
2339 | ERROR("not all paths match %s, %s has path %s", path, | |
2340 | info_ptr->hierarchy->subsystems[0], info_ptr->cgroup_path); | |
2341 | return NULL; | |
2342 | } | |
2343 | } | |
2344 | ||
2345 | return path; | |
2346 | } | |
2347 | ||
06078509 TA |
2348 | static bool cgfs_escape(void) |
2349 | { | |
2350 | struct cgroup_meta_data *md; | |
2351 | int i; | |
2352 | bool ret = false; | |
2353 | ||
2354 | md = lxc_cgroup_load_meta(); | |
2355 | if (!md) | |
2356 | return false; | |
2357 | ||
2358 | for (i = 1; i <= md->maximum_hierarchy; i++) { | |
2359 | struct cgroup_hierarchy *h = md->hierarchies[i]; | |
2360 | struct cgroup_mount_point *mp; | |
2361 | char *tasks; | |
2362 | FILE *f; | |
2363 | int written; | |
2364 | ||
2365 | if (!h) { | |
2366 | WARN("not escaping hierarchy %d", i); | |
2367 | continue; | |
2368 | } | |
2369 | ||
2370 | mp = lxc_cgroup_find_mount_point(h, "/", true); | |
2371 | if (!mp) | |
2372 | goto out; | |
2373 | ||
2374 | tasks = cgroup_to_absolute_path(mp, "/", "tasks"); | |
2375 | if (!tasks) | |
2376 | goto out; | |
2377 | ||
2378 | f = fopen(tasks, "a"); | |
2379 | free(tasks); | |
2380 | if (!f) | |
2381 | goto out; | |
2382 | ||
2383 | written = fprintf(f, "%d\n", getpid()); | |
2384 | fclose(f); | |
2385 | if (written < 0) { | |
2386 | SYSERROR("writing tasks failed\n"); | |
2387 | goto out; | |
2388 | } | |
2389 | } | |
2390 | ||
2391 | ret = true; | |
2392 | out: | |
2393 | lxc_cgroup_put_meta(md); | |
2394 | return ret; | |
2395 | } | |
2396 | ||
4fb3cba5 | 2397 | static bool cgfs_unfreeze(void *hdata) |
0086f499 | 2398 | { |
4fb3cba5 | 2399 | struct cgfs_data *d = hdata; |
0086f499 SH |
2400 | char *cgabspath, *cgrelpath; |
2401 | int ret; | |
2402 | ||
4fb3cba5 DE |
2403 | if (!d) |
2404 | return false; | |
2405 | ||
2406 | cgrelpath = lxc_cgroup_get_hierarchy_path_data("freezer", d); | |
0086f499 SH |
2407 | cgabspath = lxc_cgroup_find_abs_path("freezer", cgrelpath, true, NULL); |
2408 | if (!cgabspath) | |
ecfcb3f0 | 2409 | return false; |
0086f499 SH |
2410 | |
2411 | ret = do_cgroup_set(cgabspath, "freezer.state", "THAWED"); | |
2412 | free(cgabspath); | |
ecfcb3f0 | 2413 | return ret == 0; |
0086f499 SH |
2414 | } |
2415 | ||
4fb3cba5 DE |
2416 | static bool cgroupfs_setup_limits(void *hdata, struct lxc_list *cgroup_conf, |
2417 | bool with_devices) | |
9daf6f5d | 2418 | { |
4fb3cba5 DE |
2419 | struct cgfs_data *d = hdata; |
2420 | ||
2421 | if (!d) | |
2422 | return false; | |
2423 | return do_setup_cgroup_limits(d, cgroup_conf, with_devices) == 0; | |
9daf6f5d SH |
2424 | } |
2425 | ||
4fb3cba5 | 2426 | static bool lxc_cgroupfs_attach(const char *name, const char *lxcpath, pid_t pid) |
5d897655 SH |
2427 | { |
2428 | struct cgroup_meta_data *meta_data; | |
2429 | struct cgroup_process_info *container_info; | |
2430 | int ret; | |
2431 | ||
2432 | meta_data = lxc_cgroup_load_meta(); | |
2433 | if (!meta_data) { | |
2434 | ERROR("could not move attached process %d to cgroup of container", pid); | |
2435 | return false; | |
2436 | } | |
2437 | ||
2438 | container_info = lxc_cgroup_get_container_info(name, lxcpath, meta_data); | |
2439 | lxc_cgroup_put_meta(meta_data); | |
2440 | if (!container_info) { | |
2441 | ERROR("could not move attached process %d to cgroup of container", pid); | |
2442 | return false; | |
2443 | } | |
2444 | ||
2445 | ret = lxc_cgroupfs_enter(container_info, pid, false); | |
2446 | lxc_cgroup_process_info_free(container_info); | |
2447 | if (ret < 0) { | |
2448 | ERROR("could not move attached process %d to cgroup of container", pid); | |
2449 | return false; | |
2450 | } | |
2451 | return true; | |
2452 | } | |
2453 | ||
8b276860 SH |
2454 | struct chown_data { |
2455 | const char *cgroup_path; | |
2456 | uid_t origuid; | |
2457 | }; | |
2458 | ||
2459 | /* | |
2460 | * TODO - someone should refactor this to unshare once passing all the paths | |
2461 | * to be chowned in one go | |
2462 | */ | |
2463 | static int chown_cgroup_wrapper(void *data) | |
2464 | { | |
2465 | struct chown_data *arg = data; | |
2466 | uid_t destuid; | |
2467 | char *fpath; | |
2468 | ||
2469 | ||
2470 | if (setresgid(0,0,0) < 0) | |
2471 | SYSERROR("Failed to setgid to 0"); | |
2472 | if (setresuid(0,0,0) < 0) | |
2473 | SYSERROR("Failed to setuid to 0"); | |
2474 | if (setgroups(0, NULL) < 0) | |
2475 | SYSERROR("Failed to clear groups"); | |
2476 | destuid = get_ns_uid(arg->origuid); | |
2477 | ||
2478 | if (chown(arg->cgroup_path, destuid, 0) < 0) | |
2479 | SYSERROR("Failed chowning %s to %d", arg->cgroup_path, (int)destuid); | |
2480 | ||
2481 | fpath = lxc_append_paths(arg->cgroup_path, "tasks"); | |
2482 | if (!fpath) | |
2483 | return -1; | |
2484 | if (chown(fpath, destuid, 0) < 0) | |
2485 | SYSERROR("Error chowning %s\n", fpath); | |
2486 | free(fpath); | |
2487 | fpath = lxc_append_paths(arg->cgroup_path, "cgroup.procs"); | |
2488 | if (!fpath) | |
2489 | return -1; | |
2490 | if (chown(fpath, destuid, 0) < 0) | |
2491 | SYSERROR("Error chowning %s", fpath); | |
2492 | free(fpath); | |
2493 | ||
2494 | return 0; | |
2495 | } | |
2496 | ||
2497 | static bool do_cgfs_chown(char *cgroup_path, struct lxc_conf *conf) | |
2498 | { | |
2499 | struct chown_data data; | |
2500 | char *fpath; | |
2501 | ||
2502 | if (lxc_list_empty(&conf->id_map)) | |
2503 | /* If there's no mapping then we don't need to chown */ | |
2504 | return true; | |
2505 | ||
2506 | data.cgroup_path = cgroup_path; | |
2507 | data.origuid = geteuid(); | |
2508 | ||
2509 | /* Unpriv users can't chown it themselves, so chown from | |
2510 | * a child namespace mapping both our own and the target uid | |
2511 | */ | |
2512 | if (userns_exec_1(conf, chown_cgroup_wrapper, &data) < 0) { | |
2513 | ERROR("Error requesting cgroup chown in new namespace"); | |
2514 | return false; | |
2515 | } | |
2516 | ||
2517 | /* | |
2518 | * Now chmod 775 the directory else the container cannot create cgroups. | |
2519 | * This can't be done in the child namespace because it only group-owns | |
2520 | * the cgroup | |
2521 | */ | |
2522 | if (chmod(cgroup_path, 0775) < 0) { | |
2523 | SYSERROR("Error chmoding %s\n", cgroup_path); | |
2524 | return false; | |
2525 | } | |
2526 | fpath = lxc_append_paths(cgroup_path, "tasks"); | |
2527 | if (!fpath) | |
2528 | return false; | |
2529 | if (chmod(fpath, 0664) < 0) | |
2530 | SYSERROR("Error chmoding %s\n", fpath); | |
2531 | free(fpath); | |
2532 | fpath = lxc_append_paths(cgroup_path, "cgroup.procs"); | |
2533 | if (!fpath) | |
2534 | return false; | |
2535 | if (chmod(fpath, 0664) < 0) | |
2536 | SYSERROR("Error chmoding %s\n", fpath); | |
2537 | free(fpath); | |
2538 | ||
2539 | return true; | |
2540 | } | |
2541 | ||
2542 | static bool cgfs_chown(void *hdata, struct lxc_conf *conf) | |
2543 | { | |
2544 | struct cgfs_data *d = hdata; | |
2545 | struct cgroup_process_info *info_ptr; | |
2546 | char *cgpath; | |
2547 | bool r = true; | |
2548 | ||
2549 | if (!d) | |
2550 | return false; | |
2551 | ||
2552 | for (info_ptr = d->info; info_ptr; info_ptr = info_ptr->next) { | |
2553 | if (!info_ptr->designated_mount_point) { | |
2554 | info_ptr->designated_mount_point = lxc_cgroup_find_mount_point(info_ptr->hierarchy, info_ptr->cgroup_path, true); | |
2555 | if (!info_ptr->designated_mount_point) { | |
2556 | SYSERROR("Could not chown cgroup %s: internal error (couldn't find any writable mountpoint to cgroup filesystem)", info_ptr->cgroup_path); | |
2557 | return false; | |
2558 | } | |
2559 | } | |
2560 | ||
2561 | cgpath = cgroup_to_absolute_path(info_ptr->designated_mount_point, info_ptr->cgroup_path, NULL); | |
2562 | if (!cgpath) { | |
2563 | SYSERROR("Could not chown cgroup %s: internal error", info_ptr->cgroup_path); | |
2564 | continue; | |
2565 | } | |
2566 | r = do_cgfs_chown(cgpath, conf); | |
2567 | if (!r) { | |
2568 | ERROR("Failed chowning %s\n", cgpath); | |
2569 | free(cgpath); | |
2570 | return false; | |
2571 | } | |
2572 | free(cgpath); | |
2573 | } | |
2574 | ||
2575 | return true; | |
2576 | } | |
2577 | ||
d4ef7c50 | 2578 | static struct cgroup_ops cgfs_ops = { |
d4ef7c50 | 2579 | .init = cgfs_init, |
4fb3cba5 | 2580 | .destroy = cgfs_destroy, |
d4ef7c50 SH |
2581 | .create = cgfs_create, |
2582 | .enter = cgfs_enter, | |
2583 | .create_legacy = cgfs_create_legacy, | |
2584 | .get_cgroup = cgfs_get_cgroup, | |
2ba7a429 | 2585 | .canonical_path = cgfs_canonical_path, |
06078509 | 2586 | .escape = cgfs_escape, |
d4ef7c50 SH |
2587 | .get = lxc_cgroupfs_get, |
2588 | .set = lxc_cgroupfs_set, | |
4fb3cba5 | 2589 | .unfreeze = cgfs_unfreeze, |
9daf6f5d | 2590 | .setup_limits = cgroupfs_setup_limits, |
d4ef7c50 | 2591 | .name = "cgroupfs", |
5d897655 | 2592 | .attach = lxc_cgroupfs_attach, |
8b276860 | 2593 | .chown = cgfs_chown, |
c476bdce | 2594 | .mount_cgroup = cgroupfs_mount_cgroup, |
4fb3cba5 | 2595 | .nrtasks = cgfs_nrtasks, |
23befb18 | 2596 | .driver = CGFS, |
d4ef7c50 | 2597 | }; |