Tetsuo Handa | 847b173 | 2010-02-11 09:43:54 +0900 | [diff] [blame] | 1 | /* |
| 2 | * security/tomoyo/gc.c |
| 3 | * |
| 4 | * Implementation of the Domain-Based Mandatory Access Control. |
| 5 | * |
| 6 | * Copyright (C) 2005-2010 NTT DATA CORPORATION |
| 7 | * |
| 8 | */ |
| 9 | |
| 10 | #include "common.h" |
| 11 | #include <linux/kthread.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 12 | #include <linux/slab.h> |
Tetsuo Handa | 847b173 | 2010-02-11 09:43:54 +0900 | [diff] [blame] | 13 | |
| 14 | enum tomoyo_gc_id { |
Tetsuo Handa | 7762fbf | 2010-05-10 17:30:26 +0900 | [diff] [blame] | 15 | TOMOYO_ID_PATH_GROUP, |
| 16 | TOMOYO_ID_PATH_GROUP_MEMBER, |
Tetsuo Handa | 4c3e9e2 | 2010-05-17 10:06:58 +0900 | [diff] [blame] | 17 | TOMOYO_ID_NUMBER_GROUP, |
| 18 | TOMOYO_ID_NUMBER_GROUP_MEMBER, |
Tetsuo Handa | 847b173 | 2010-02-11 09:43:54 +0900 | [diff] [blame] | 19 | TOMOYO_ID_DOMAIN_INITIALIZER, |
| 20 | TOMOYO_ID_DOMAIN_KEEPER, |
Tetsuo Handa | 1084307 | 2010-06-03 20:38:03 +0900 | [diff] [blame^] | 21 | TOMOYO_ID_AGGREGATOR, |
Tetsuo Handa | 847b173 | 2010-02-11 09:43:54 +0900 | [diff] [blame] | 22 | TOMOYO_ID_ALIAS, |
| 23 | TOMOYO_ID_GLOBALLY_READABLE, |
| 24 | TOMOYO_ID_PATTERN, |
| 25 | TOMOYO_ID_NO_REWRITE, |
| 26 | TOMOYO_ID_MANAGER, |
| 27 | TOMOYO_ID_NAME, |
| 28 | TOMOYO_ID_ACL, |
| 29 | TOMOYO_ID_DOMAIN |
| 30 | }; |
| 31 | |
| 32 | struct tomoyo_gc_entry { |
| 33 | struct list_head list; |
| 34 | int type; |
| 35 | void *element; |
| 36 | }; |
| 37 | static LIST_HEAD(tomoyo_gc_queue); |
| 38 | static DEFINE_MUTEX(tomoyo_gc_mutex); |
| 39 | |
| 40 | /* Caller holds tomoyo_policy_lock mutex. */ |
| 41 | static bool tomoyo_add_to_gc(const int type, void *element) |
| 42 | { |
| 43 | struct tomoyo_gc_entry *entry = kzalloc(sizeof(*entry), GFP_ATOMIC); |
| 44 | if (!entry) |
| 45 | return false; |
| 46 | entry->type = type; |
| 47 | entry->element = element; |
| 48 | list_add(&entry->list, &tomoyo_gc_queue); |
| 49 | return true; |
| 50 | } |
| 51 | |
| 52 | static void tomoyo_del_allow_read |
| 53 | (struct tomoyo_globally_readable_file_entry *ptr) |
| 54 | { |
| 55 | tomoyo_put_name(ptr->filename); |
| 56 | } |
| 57 | |
| 58 | static void tomoyo_del_file_pattern(struct tomoyo_pattern_entry *ptr) |
| 59 | { |
| 60 | tomoyo_put_name(ptr->pattern); |
| 61 | } |
| 62 | |
| 63 | static void tomoyo_del_no_rewrite(struct tomoyo_no_rewrite_entry *ptr) |
| 64 | { |
| 65 | tomoyo_put_name(ptr->pattern); |
| 66 | } |
| 67 | |
| 68 | static void tomoyo_del_domain_initializer |
| 69 | (struct tomoyo_domain_initializer_entry *ptr) |
| 70 | { |
| 71 | tomoyo_put_name(ptr->domainname); |
| 72 | tomoyo_put_name(ptr->program); |
| 73 | } |
| 74 | |
| 75 | static void tomoyo_del_domain_keeper(struct tomoyo_domain_keeper_entry *ptr) |
| 76 | { |
| 77 | tomoyo_put_name(ptr->domainname); |
| 78 | tomoyo_put_name(ptr->program); |
| 79 | } |
| 80 | |
Tetsuo Handa | 1084307 | 2010-06-03 20:38:03 +0900 | [diff] [blame^] | 81 | static void tomoyo_del_aggregator(struct tomoyo_aggregator_entry *ptr) |
| 82 | { |
| 83 | tomoyo_put_name(ptr->original_name); |
| 84 | tomoyo_put_name(ptr->aggregated_name); |
| 85 | } |
| 86 | |
Tetsuo Handa | 847b173 | 2010-02-11 09:43:54 +0900 | [diff] [blame] | 87 | static void tomoyo_del_alias(struct tomoyo_alias_entry *ptr) |
| 88 | { |
| 89 | tomoyo_put_name(ptr->original_name); |
| 90 | tomoyo_put_name(ptr->aliased_name); |
| 91 | } |
| 92 | |
| 93 | static void tomoyo_del_manager(struct tomoyo_policy_manager_entry *ptr) |
| 94 | { |
| 95 | tomoyo_put_name(ptr->manager); |
| 96 | } |
| 97 | |
| 98 | static void tomoyo_del_acl(struct tomoyo_acl_info *acl) |
| 99 | { |
| 100 | switch (acl->type) { |
Tetsuo Handa | 7ef6123 | 2010-02-16 08:03:30 +0900 | [diff] [blame] | 101 | case TOMOYO_TYPE_PATH_ACL: |
Tetsuo Handa | 847b173 | 2010-02-11 09:43:54 +0900 | [diff] [blame] | 102 | { |
Tetsuo Handa | 7ef6123 | 2010-02-16 08:03:30 +0900 | [diff] [blame] | 103 | struct tomoyo_path_acl *entry |
Tetsuo Handa | 847b173 | 2010-02-11 09:43:54 +0900 | [diff] [blame] | 104 | = container_of(acl, typeof(*entry), head); |
Tetsuo Handa | 7762fbf | 2010-05-10 17:30:26 +0900 | [diff] [blame] | 105 | tomoyo_put_name_union(&entry->name); |
Tetsuo Handa | 847b173 | 2010-02-11 09:43:54 +0900 | [diff] [blame] | 106 | } |
| 107 | break; |
Tetsuo Handa | 7ef6123 | 2010-02-16 08:03:30 +0900 | [diff] [blame] | 108 | case TOMOYO_TYPE_PATH2_ACL: |
Tetsuo Handa | 847b173 | 2010-02-11 09:43:54 +0900 | [diff] [blame] | 109 | { |
Tetsuo Handa | 7ef6123 | 2010-02-16 08:03:30 +0900 | [diff] [blame] | 110 | struct tomoyo_path2_acl *entry |
Tetsuo Handa | 847b173 | 2010-02-11 09:43:54 +0900 | [diff] [blame] | 111 | = container_of(acl, typeof(*entry), head); |
Tetsuo Handa | 7762fbf | 2010-05-10 17:30:26 +0900 | [diff] [blame] | 112 | tomoyo_put_name_union(&entry->name1); |
| 113 | tomoyo_put_name_union(&entry->name2); |
Tetsuo Handa | 847b173 | 2010-02-11 09:43:54 +0900 | [diff] [blame] | 114 | } |
| 115 | break; |
Tetsuo Handa | a1f9bb6 | 2010-05-17 10:09:15 +0900 | [diff] [blame] | 116 | case TOMOYO_TYPE_PATH_NUMBER_ACL: |
| 117 | { |
| 118 | struct tomoyo_path_number_acl *entry |
| 119 | = container_of(acl, typeof(*entry), head); |
| 120 | tomoyo_put_name_union(&entry->name); |
| 121 | tomoyo_put_number_union(&entry->number); |
| 122 | } |
| 123 | break; |
| 124 | case TOMOYO_TYPE_PATH_NUMBER3_ACL: |
| 125 | { |
| 126 | struct tomoyo_path_number3_acl *entry |
| 127 | = container_of(acl, typeof(*entry), head); |
| 128 | tomoyo_put_name_union(&entry->name); |
| 129 | tomoyo_put_number_union(&entry->mode); |
| 130 | tomoyo_put_number_union(&entry->major); |
| 131 | tomoyo_put_number_union(&entry->minor); |
| 132 | } |
| 133 | break; |
Tetsuo Handa | 2106ccd | 2010-05-17 10:10:31 +0900 | [diff] [blame] | 134 | case TOMOYO_TYPE_MOUNT_ACL: |
| 135 | { |
| 136 | struct tomoyo_mount_acl *entry |
| 137 | = container_of(acl, typeof(*entry), head); |
| 138 | tomoyo_put_name_union(&entry->dev_name); |
| 139 | tomoyo_put_name_union(&entry->dir_name); |
| 140 | tomoyo_put_name_union(&entry->fs_type); |
| 141 | tomoyo_put_number_union(&entry->flags); |
| 142 | } |
| 143 | break; |
Tetsuo Handa | 847b173 | 2010-02-11 09:43:54 +0900 | [diff] [blame] | 144 | default: |
| 145 | printk(KERN_WARNING "Unknown type\n"); |
| 146 | break; |
| 147 | } |
| 148 | } |
| 149 | |
| 150 | static bool tomoyo_del_domain(struct tomoyo_domain_info *domain) |
| 151 | { |
| 152 | struct tomoyo_acl_info *acl; |
| 153 | struct tomoyo_acl_info *tmp; |
| 154 | /* |
| 155 | * Since we don't protect whole execve() operation using SRCU, |
| 156 | * we need to recheck domain->users at this point. |
| 157 | * |
| 158 | * (1) Reader starts SRCU section upon execve(). |
| 159 | * (2) Reader traverses tomoyo_domain_list and finds this domain. |
| 160 | * (3) Writer marks this domain as deleted. |
| 161 | * (4) Garbage collector removes this domain from tomoyo_domain_list |
| 162 | * because this domain is marked as deleted and used by nobody. |
| 163 | * (5) Reader saves reference to this domain into |
| 164 | * "struct linux_binprm"->cred->security . |
| 165 | * (6) Reader finishes SRCU section, although execve() operation has |
| 166 | * not finished yet. |
| 167 | * (7) Garbage collector waits for SRCU synchronization. |
| 168 | * (8) Garbage collector kfree() this domain because this domain is |
| 169 | * used by nobody. |
| 170 | * (9) Reader finishes execve() operation and restores this domain from |
| 171 | * "struct linux_binprm"->cred->security. |
| 172 | * |
| 173 | * By updating domain->users at (5), we can solve this race problem |
| 174 | * by rechecking domain->users at (8). |
| 175 | */ |
| 176 | if (atomic_read(&domain->users)) |
| 177 | return false; |
| 178 | list_for_each_entry_safe(acl, tmp, &domain->acl_info_list, list) { |
| 179 | tomoyo_del_acl(acl); |
| 180 | tomoyo_memory_free(acl); |
| 181 | } |
| 182 | tomoyo_put_name(domain->domainname); |
| 183 | return true; |
| 184 | } |
| 185 | |
| 186 | |
| 187 | static void tomoyo_del_name(const struct tomoyo_name_entry *ptr) |
| 188 | { |
| 189 | } |
| 190 | |
Tetsuo Handa | 7762fbf | 2010-05-10 17:30:26 +0900 | [diff] [blame] | 191 | static void tomoyo_del_path_group_member(struct tomoyo_path_group_member |
| 192 | *member) |
| 193 | { |
| 194 | tomoyo_put_name(member->member_name); |
| 195 | } |
| 196 | |
| 197 | static void tomoyo_del_path_group(struct tomoyo_path_group *group) |
| 198 | { |
| 199 | tomoyo_put_name(group->group_name); |
| 200 | } |
| 201 | |
Tetsuo Handa | 4c3e9e2 | 2010-05-17 10:06:58 +0900 | [diff] [blame] | 202 | static void tomoyo_del_number_group_member(struct tomoyo_number_group_member |
| 203 | *member) |
| 204 | { |
| 205 | } |
| 206 | |
| 207 | static void tomoyo_del_number_group(struct tomoyo_number_group *group) |
| 208 | { |
| 209 | tomoyo_put_name(group->group_name); |
| 210 | } |
| 211 | |
Tetsuo Handa | 847b173 | 2010-02-11 09:43:54 +0900 | [diff] [blame] | 212 | static void tomoyo_collect_entry(void) |
| 213 | { |
Tetsuo Handa | 2928238 | 2010-05-06 00:18:15 +0900 | [diff] [blame] | 214 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
| 215 | return; |
Tetsuo Handa | 847b173 | 2010-02-11 09:43:54 +0900 | [diff] [blame] | 216 | { |
| 217 | struct tomoyo_globally_readable_file_entry *ptr; |
| 218 | list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, |
| 219 | list) { |
| 220 | if (!ptr->is_deleted) |
| 221 | continue; |
| 222 | if (tomoyo_add_to_gc(TOMOYO_ID_GLOBALLY_READABLE, ptr)) |
| 223 | list_del_rcu(&ptr->list); |
| 224 | else |
| 225 | break; |
| 226 | } |
| 227 | } |
| 228 | { |
| 229 | struct tomoyo_pattern_entry *ptr; |
| 230 | list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { |
| 231 | if (!ptr->is_deleted) |
| 232 | continue; |
| 233 | if (tomoyo_add_to_gc(TOMOYO_ID_PATTERN, ptr)) |
| 234 | list_del_rcu(&ptr->list); |
| 235 | else |
| 236 | break; |
| 237 | } |
| 238 | } |
| 239 | { |
| 240 | struct tomoyo_no_rewrite_entry *ptr; |
| 241 | list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) { |
| 242 | if (!ptr->is_deleted) |
| 243 | continue; |
| 244 | if (tomoyo_add_to_gc(TOMOYO_ID_NO_REWRITE, ptr)) |
| 245 | list_del_rcu(&ptr->list); |
| 246 | else |
| 247 | break; |
| 248 | } |
| 249 | } |
| 250 | { |
| 251 | struct tomoyo_domain_initializer_entry *ptr; |
| 252 | list_for_each_entry_rcu(ptr, &tomoyo_domain_initializer_list, |
| 253 | list) { |
| 254 | if (!ptr->is_deleted) |
| 255 | continue; |
| 256 | if (tomoyo_add_to_gc(TOMOYO_ID_DOMAIN_INITIALIZER, ptr)) |
| 257 | list_del_rcu(&ptr->list); |
| 258 | else |
| 259 | break; |
| 260 | } |
| 261 | } |
| 262 | { |
| 263 | struct tomoyo_domain_keeper_entry *ptr; |
| 264 | list_for_each_entry_rcu(ptr, &tomoyo_domain_keeper_list, list) { |
| 265 | if (!ptr->is_deleted) |
| 266 | continue; |
| 267 | if (tomoyo_add_to_gc(TOMOYO_ID_DOMAIN_KEEPER, ptr)) |
| 268 | list_del_rcu(&ptr->list); |
| 269 | else |
| 270 | break; |
| 271 | } |
| 272 | } |
| 273 | { |
Tetsuo Handa | 1084307 | 2010-06-03 20:38:03 +0900 | [diff] [blame^] | 274 | struct tomoyo_aggregator_entry *ptr; |
| 275 | list_for_each_entry_rcu(ptr, &tomoyo_aggregator_list, list) { |
| 276 | if (!ptr->is_deleted) |
| 277 | continue; |
| 278 | if (tomoyo_add_to_gc(TOMOYO_ID_AGGREGATOR, ptr)) |
| 279 | list_del_rcu(&ptr->list); |
| 280 | else |
| 281 | break; |
| 282 | } |
| 283 | } |
| 284 | { |
Tetsuo Handa | 847b173 | 2010-02-11 09:43:54 +0900 | [diff] [blame] | 285 | struct tomoyo_alias_entry *ptr; |
| 286 | list_for_each_entry_rcu(ptr, &tomoyo_alias_list, list) { |
| 287 | if (!ptr->is_deleted) |
| 288 | continue; |
| 289 | if (tomoyo_add_to_gc(TOMOYO_ID_ALIAS, ptr)) |
| 290 | list_del_rcu(&ptr->list); |
| 291 | else |
| 292 | break; |
| 293 | } |
| 294 | } |
| 295 | { |
| 296 | struct tomoyo_policy_manager_entry *ptr; |
| 297 | list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, |
| 298 | list) { |
| 299 | if (!ptr->is_deleted) |
| 300 | continue; |
| 301 | if (tomoyo_add_to_gc(TOMOYO_ID_MANAGER, ptr)) |
| 302 | list_del_rcu(&ptr->list); |
| 303 | else |
| 304 | break; |
| 305 | } |
| 306 | } |
| 307 | { |
| 308 | struct tomoyo_domain_info *domain; |
| 309 | list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { |
| 310 | struct tomoyo_acl_info *acl; |
| 311 | list_for_each_entry_rcu(acl, &domain->acl_info_list, |
| 312 | list) { |
| 313 | switch (acl->type) { |
Tetsuo Handa | 7ef6123 | 2010-02-16 08:03:30 +0900 | [diff] [blame] | 314 | case TOMOYO_TYPE_PATH_ACL: |
Tetsuo Handa | 847b173 | 2010-02-11 09:43:54 +0900 | [diff] [blame] | 315 | if (container_of(acl, |
Tetsuo Handa | 7ef6123 | 2010-02-16 08:03:30 +0900 | [diff] [blame] | 316 | struct tomoyo_path_acl, |
Tetsuo Handa | a1f9bb6 | 2010-05-17 10:09:15 +0900 | [diff] [blame] | 317 | head)->perm) |
Tetsuo Handa | 847b173 | 2010-02-11 09:43:54 +0900 | [diff] [blame] | 318 | continue; |
| 319 | break; |
Tetsuo Handa | 7ef6123 | 2010-02-16 08:03:30 +0900 | [diff] [blame] | 320 | case TOMOYO_TYPE_PATH2_ACL: |
Tetsuo Handa | 847b173 | 2010-02-11 09:43:54 +0900 | [diff] [blame] | 321 | if (container_of(acl, |
Tetsuo Handa | 7ef6123 | 2010-02-16 08:03:30 +0900 | [diff] [blame] | 322 | struct tomoyo_path2_acl, |
Tetsuo Handa | 847b173 | 2010-02-11 09:43:54 +0900 | [diff] [blame] | 323 | head)->perm) |
| 324 | continue; |
| 325 | break; |
Tetsuo Handa | a1f9bb6 | 2010-05-17 10:09:15 +0900 | [diff] [blame] | 326 | case TOMOYO_TYPE_PATH_NUMBER_ACL: |
| 327 | if (container_of(acl, |
| 328 | struct tomoyo_path_number_acl, |
| 329 | head)->perm) |
| 330 | continue; |
| 331 | break; |
| 332 | case TOMOYO_TYPE_PATH_NUMBER3_ACL: |
| 333 | if (container_of(acl, |
| 334 | struct tomoyo_path_number3_acl, |
| 335 | head)->perm) |
| 336 | continue; |
| 337 | break; |
Tetsuo Handa | 847b173 | 2010-02-11 09:43:54 +0900 | [diff] [blame] | 338 | default: |
| 339 | continue; |
| 340 | } |
| 341 | if (tomoyo_add_to_gc(TOMOYO_ID_ACL, acl)) |
| 342 | list_del_rcu(&acl->list); |
| 343 | else |
| 344 | break; |
| 345 | } |
| 346 | if (!domain->is_deleted || atomic_read(&domain->users)) |
| 347 | continue; |
| 348 | /* |
| 349 | * Nobody is referring this domain. But somebody may |
| 350 | * refer this domain after successful execve(). |
| 351 | * We recheck domain->users after SRCU synchronization. |
| 352 | */ |
| 353 | if (tomoyo_add_to_gc(TOMOYO_ID_DOMAIN, domain)) |
| 354 | list_del_rcu(&domain->list); |
| 355 | else |
| 356 | break; |
| 357 | } |
| 358 | } |
Tetsuo Handa | 847b173 | 2010-02-11 09:43:54 +0900 | [diff] [blame] | 359 | { |
| 360 | int i; |
| 361 | for (i = 0; i < TOMOYO_MAX_HASH; i++) { |
| 362 | struct tomoyo_name_entry *ptr; |
| 363 | list_for_each_entry_rcu(ptr, &tomoyo_name_list[i], |
| 364 | list) { |
| 365 | if (atomic_read(&ptr->users)) |
| 366 | continue; |
| 367 | if (tomoyo_add_to_gc(TOMOYO_ID_NAME, ptr)) |
| 368 | list_del_rcu(&ptr->list); |
| 369 | else { |
| 370 | i = TOMOYO_MAX_HASH; |
| 371 | break; |
| 372 | } |
| 373 | } |
| 374 | } |
| 375 | } |
Tetsuo Handa | 7762fbf | 2010-05-10 17:30:26 +0900 | [diff] [blame] | 376 | { |
| 377 | struct tomoyo_path_group *group; |
| 378 | list_for_each_entry_rcu(group, &tomoyo_path_group_list, list) { |
| 379 | struct tomoyo_path_group_member *member; |
| 380 | list_for_each_entry_rcu(member, &group->member_list, |
| 381 | list) { |
| 382 | if (!member->is_deleted) |
| 383 | continue; |
| 384 | if (tomoyo_add_to_gc(TOMOYO_ID_PATH_GROUP_MEMBER, |
| 385 | member)) |
| 386 | list_del_rcu(&member->list); |
| 387 | else |
| 388 | break; |
| 389 | } |
| 390 | if (!list_empty(&group->member_list) || |
| 391 | atomic_read(&group->users)) |
| 392 | continue; |
| 393 | if (tomoyo_add_to_gc(TOMOYO_ID_PATH_GROUP, group)) |
| 394 | list_del_rcu(&group->list); |
| 395 | else |
| 396 | break; |
| 397 | } |
| 398 | } |
Tetsuo Handa | 4c3e9e2 | 2010-05-17 10:06:58 +0900 | [diff] [blame] | 399 | { |
| 400 | struct tomoyo_number_group *group; |
| 401 | list_for_each_entry_rcu(group, &tomoyo_number_group_list, list) { |
| 402 | struct tomoyo_number_group_member *member; |
| 403 | list_for_each_entry_rcu(member, &group->member_list, |
| 404 | list) { |
| 405 | if (!member->is_deleted) |
| 406 | continue; |
| 407 | if (tomoyo_add_to_gc(TOMOYO_ID_NUMBER_GROUP_MEMBER, |
| 408 | member)) |
| 409 | list_del_rcu(&member->list); |
| 410 | else |
| 411 | break; |
| 412 | } |
| 413 | if (!list_empty(&group->member_list) || |
| 414 | atomic_read(&group->users)) |
| 415 | continue; |
| 416 | if (tomoyo_add_to_gc(TOMOYO_ID_NUMBER_GROUP, group)) |
| 417 | list_del_rcu(&group->list); |
| 418 | else |
| 419 | break; |
| 420 | } |
| 421 | } |
Tetsuo Handa | 2928238 | 2010-05-06 00:18:15 +0900 | [diff] [blame] | 422 | mutex_unlock(&tomoyo_policy_lock); |
Tetsuo Handa | 847b173 | 2010-02-11 09:43:54 +0900 | [diff] [blame] | 423 | } |
| 424 | |
| 425 | static void tomoyo_kfree_entry(void) |
| 426 | { |
| 427 | struct tomoyo_gc_entry *p; |
| 428 | struct tomoyo_gc_entry *tmp; |
| 429 | |
| 430 | list_for_each_entry_safe(p, tmp, &tomoyo_gc_queue, list) { |
| 431 | switch (p->type) { |
| 432 | case TOMOYO_ID_DOMAIN_INITIALIZER: |
| 433 | tomoyo_del_domain_initializer(p->element); |
| 434 | break; |
| 435 | case TOMOYO_ID_DOMAIN_KEEPER: |
| 436 | tomoyo_del_domain_keeper(p->element); |
| 437 | break; |
Tetsuo Handa | 1084307 | 2010-06-03 20:38:03 +0900 | [diff] [blame^] | 438 | case TOMOYO_ID_AGGREGATOR: |
| 439 | tomoyo_del_aggregator(p->element); |
| 440 | break; |
Tetsuo Handa | 847b173 | 2010-02-11 09:43:54 +0900 | [diff] [blame] | 441 | case TOMOYO_ID_ALIAS: |
| 442 | tomoyo_del_alias(p->element); |
| 443 | break; |
| 444 | case TOMOYO_ID_GLOBALLY_READABLE: |
| 445 | tomoyo_del_allow_read(p->element); |
| 446 | break; |
| 447 | case TOMOYO_ID_PATTERN: |
| 448 | tomoyo_del_file_pattern(p->element); |
| 449 | break; |
| 450 | case TOMOYO_ID_NO_REWRITE: |
| 451 | tomoyo_del_no_rewrite(p->element); |
| 452 | break; |
| 453 | case TOMOYO_ID_MANAGER: |
| 454 | tomoyo_del_manager(p->element); |
| 455 | break; |
| 456 | case TOMOYO_ID_NAME: |
| 457 | tomoyo_del_name(p->element); |
| 458 | break; |
| 459 | case TOMOYO_ID_ACL: |
| 460 | tomoyo_del_acl(p->element); |
| 461 | break; |
| 462 | case TOMOYO_ID_DOMAIN: |
| 463 | if (!tomoyo_del_domain(p->element)) |
| 464 | continue; |
| 465 | break; |
Tetsuo Handa | 7762fbf | 2010-05-10 17:30:26 +0900 | [diff] [blame] | 466 | case TOMOYO_ID_PATH_GROUP_MEMBER: |
| 467 | tomoyo_del_path_group_member(p->element); |
| 468 | break; |
| 469 | case TOMOYO_ID_PATH_GROUP: |
| 470 | tomoyo_del_path_group(p->element); |
| 471 | break; |
Tetsuo Handa | 4c3e9e2 | 2010-05-17 10:06:58 +0900 | [diff] [blame] | 472 | case TOMOYO_ID_NUMBER_GROUP_MEMBER: |
| 473 | tomoyo_del_number_group_member(p->element); |
| 474 | break; |
| 475 | case TOMOYO_ID_NUMBER_GROUP: |
| 476 | tomoyo_del_number_group(p->element); |
| 477 | break; |
Tetsuo Handa | 847b173 | 2010-02-11 09:43:54 +0900 | [diff] [blame] | 478 | default: |
| 479 | printk(KERN_WARNING "Unknown type\n"); |
| 480 | break; |
| 481 | } |
| 482 | tomoyo_memory_free(p->element); |
| 483 | list_del(&p->list); |
| 484 | kfree(p); |
| 485 | } |
| 486 | } |
| 487 | |
| 488 | static int tomoyo_gc_thread(void *unused) |
| 489 | { |
| 490 | daemonize("GC for TOMOYO"); |
| 491 | if (mutex_trylock(&tomoyo_gc_mutex)) { |
| 492 | int i; |
| 493 | for (i = 0; i < 10; i++) { |
| 494 | tomoyo_collect_entry(); |
| 495 | if (list_empty(&tomoyo_gc_queue)) |
| 496 | break; |
| 497 | synchronize_srcu(&tomoyo_ss); |
| 498 | tomoyo_kfree_entry(); |
| 499 | } |
| 500 | mutex_unlock(&tomoyo_gc_mutex); |
| 501 | } |
| 502 | do_exit(0); |
| 503 | } |
| 504 | |
| 505 | void tomoyo_run_gc(void) |
| 506 | { |
| 507 | struct task_struct *task = kthread_create(tomoyo_gc_thread, NULL, |
| 508 | "GC for TOMOYO"); |
| 509 | if (!IS_ERR(task)) |
| 510 | wake_up_process(task); |
| 511 | } |