| 1 |
/* |
| 2 |
* security/ccsecurity/gc.c |
| 3 |
* |
| 4 |
* Copyright (C) 2005-2009 NTT DATA CORPORATION |
| 5 |
* |
| 6 |
* Version: 1.7.0-pre 2009/08/08 |
| 7 |
* |
| 8 |
* This file is applicable to both 2.4.30 and 2.6.11 and later. |
| 9 |
* See README.ccs for ChangeLog. |
| 10 |
* |
| 11 |
*/ |
| 12 |
|
| 13 |
#include <linux/version.h> |
| 14 |
#include "internal.h" |
| 15 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
| 16 |
#include <linux/kthread.h> |
| 17 |
#endif |
| 18 |
|
| 19 |
enum ccs_gc_id { |
| 20 |
CCS_ID_RESERVEDPORT, |
| 21 |
CCS_ID_ADDRESS_GROUP, |
| 22 |
CCS_ID_ADDRESS_GROUP_MEMBER, |
| 23 |
CCS_ID_PATH_GROUP, |
| 24 |
CCS_ID_PATH_GROUP_MEMBER, |
| 25 |
CCS_ID_NUMBER_GROUP, |
| 26 |
CCS_ID_NUMBER_GROUP_MEMBER, |
| 27 |
CCS_ID_GLOBAL_ENV, |
| 28 |
CCS_ID_AGGREGATOR, |
| 29 |
CCS_ID_DOMAIN_INITIALIZER, |
| 30 |
CCS_ID_DOMAIN_KEEPER, |
| 31 |
CCS_ID_GLOBALLY_READABLE, |
| 32 |
CCS_ID_PATTERN, |
| 33 |
CCS_ID_NO_REWRITE, |
| 34 |
CCS_ID_MANAGER, |
| 35 |
CCS_ID_ACL, |
| 36 |
CCS_ID_DOMAIN |
| 37 |
}; |
| 38 |
|
| 39 |
struct ccs_gc_entry { |
| 40 |
struct list_head list; |
| 41 |
int type; |
| 42 |
void *element; |
| 43 |
}; |
| 44 |
|
| 45 |
/* Caller holds ccs_policy_lock mutex. */ |
| 46 |
static bool ccs_add_to_gc(const int type, void *element, struct list_head *head) |
| 47 |
{ |
| 48 |
struct ccs_gc_entry *entry = kzalloc(sizeof(*entry), GFP_ATOMIC); |
| 49 |
if (!entry) |
| 50 |
return false; |
| 51 |
entry->type = type; |
| 52 |
entry->element = element; |
| 53 |
list_add(&entry->list, head); |
| 54 |
return true; |
| 55 |
} |
| 56 |
|
| 57 |
static size_t ccs_del_allow_read(struct ccs_globally_readable_file_entry *ptr) |
| 58 |
{ |
| 59 |
ccs_put_name(ptr->filename); |
| 60 |
return sizeof(*ptr); |
| 61 |
} |
| 62 |
|
| 63 |
static size_t ccs_del_allow_env(struct ccs_globally_usable_env_entry *ptr) |
| 64 |
{ |
| 65 |
ccs_put_name(ptr->env); |
| 66 |
return sizeof(*ptr); |
| 67 |
} |
| 68 |
|
| 69 |
static size_t ccs_del_file_pattern(struct ccs_pattern_entry *ptr) |
| 70 |
{ |
| 71 |
ccs_put_name(ptr->pattern); |
| 72 |
return sizeof(*ptr); |
| 73 |
} |
| 74 |
|
| 75 |
static size_t ccs_del_no_rewrite(struct ccs_no_rewrite_entry *ptr) |
| 76 |
{ |
| 77 |
ccs_put_name(ptr->pattern); |
| 78 |
return sizeof(*ptr); |
| 79 |
} |
| 80 |
|
| 81 |
static size_t ccs_del_domain_initializer(struct ccs_domain_initializer_entry * |
| 82 |
ptr) |
| 83 |
{ |
| 84 |
ccs_put_name(ptr->domainname); |
| 85 |
ccs_put_name(ptr->program); |
| 86 |
return sizeof(*ptr); |
| 87 |
} |
| 88 |
|
| 89 |
static size_t ccs_del_domain_keeper(struct ccs_domain_keeper_entry *ptr) |
| 90 |
{ |
| 91 |
ccs_put_name(ptr->domainname); |
| 92 |
ccs_put_name(ptr->program); |
| 93 |
return sizeof(*ptr); |
| 94 |
} |
| 95 |
|
| 96 |
static size_t ccs_del_aggregator(struct ccs_aggregator_entry *ptr) |
| 97 |
{ |
| 98 |
ccs_put_name(ptr->original_name); |
| 99 |
ccs_put_name(ptr->aggregated_name); |
| 100 |
return sizeof(*ptr); |
| 101 |
} |
| 102 |
|
| 103 |
static size_t ccs_del_manager(struct ccs_policy_manager_entry *ptr) |
| 104 |
{ |
| 105 |
ccs_put_name(ptr->manager); |
| 106 |
return sizeof(*ptr); |
| 107 |
} |
| 108 |
|
| 109 |
/* For compatibility with older kernels. */ |
| 110 |
#ifndef for_each_process |
| 111 |
#define for_each_process for_each_task |
| 112 |
#endif |
| 113 |
|
| 114 |
/** |
| 115 |
* ccs_used_by_task - Check whether the given pointer is referenced by a task. |
| 116 |
* |
| 117 |
* @domain: Pointer to "struct ccs_domain_info". |
| 118 |
* |
| 119 |
* Returns true if @ptr is in use, false otherwise. |
| 120 |
*/ |
| 121 |
static bool ccs_used_by_task(struct ccs_domain_info *domain) |
| 122 |
{ |
| 123 |
bool in_use = false; |
| 124 |
struct task_struct *p; |
| 125 |
/***** CRITICAL SECTION START *****/ |
| 126 |
read_lock(&tasklist_lock); |
| 127 |
for_each_process(p) { |
| 128 |
if (p->ccs_domain_info != domain) |
| 129 |
continue; |
| 130 |
in_use = true; |
| 131 |
break; |
| 132 |
} |
| 133 |
read_unlock(&tasklist_lock); |
| 134 |
/***** CRITICAL SECTION END *****/ |
| 135 |
return in_use; |
| 136 |
} |
| 137 |
|
| 138 |
static size_t ccs_del_acl(struct ccs_acl_info *acl) |
| 139 |
{ |
| 140 |
size_t size; |
| 141 |
ccs_put_condition(acl->cond); |
| 142 |
switch (ccs_acl_type1(acl)) { |
| 143 |
case CCS_TYPE_SINGLE_PATH_ACL: |
| 144 |
{ |
| 145 |
struct ccs_single_path_acl_record *entry; |
| 146 |
size = sizeof(*entry); |
| 147 |
entry = container_of(acl, typeof(*entry), head); |
| 148 |
ccs_put_name_union(&entry->name); |
| 149 |
} |
| 150 |
break; |
| 151 |
case CCS_TYPE_MKDEV_ACL: |
| 152 |
{ |
| 153 |
struct ccs_mkdev_acl_record *entry; |
| 154 |
size = sizeof(*entry); |
| 155 |
entry = container_of(acl, typeof(*entry), head); |
| 156 |
ccs_put_name_union(&entry->name); |
| 157 |
ccs_put_number_union(&entry->major); |
| 158 |
ccs_put_number_union(&entry->minor); |
| 159 |
} |
| 160 |
break; |
| 161 |
case CCS_TYPE_DOUBLE_PATH_ACL: |
| 162 |
{ |
| 163 |
struct ccs_double_path_acl_record *entry; |
| 164 |
size = sizeof(*entry); |
| 165 |
entry = container_of(acl, typeof(*entry), head); |
| 166 |
ccs_put_name_union(&entry->name1); |
| 167 |
ccs_put_name_union(&entry->name2); |
| 168 |
} |
| 169 |
break; |
| 170 |
case CCS_TYPE_IP_NETWORK_ACL: |
| 171 |
{ |
| 172 |
struct ccs_ip_network_acl_record *entry; |
| 173 |
size = sizeof(*entry); |
| 174 |
entry = container_of(acl, typeof(*entry), head); |
| 175 |
switch (entry->record_type) { |
| 176 |
case CCS_IP_RECORD_TYPE_ADDRESS_GROUP: |
| 177 |
ccs_put_address_group(entry->address.group); |
| 178 |
break; |
| 179 |
case CCS_IP_RECORD_TYPE_IPv6: |
| 180 |
ccs_put_ipv6_address(entry->address.ipv6.min); |
| 181 |
ccs_put_ipv6_address(entry->address.ipv6.max); |
| 182 |
break; |
| 183 |
} |
| 184 |
ccs_put_number_union(&entry->port); |
| 185 |
} |
| 186 |
break; |
| 187 |
case CCS_TYPE_PATH_NUMBER_ACL: |
| 188 |
{ |
| 189 |
struct ccs_path_number_acl_record *entry; |
| 190 |
size = sizeof(*entry); |
| 191 |
entry = container_of(acl, typeof(*entry), head); |
| 192 |
ccs_put_name_union(&entry->name); |
| 193 |
ccs_put_number_union(&entry->number); |
| 194 |
} |
| 195 |
break; |
| 196 |
case CCS_TYPE_ENV_ACL: |
| 197 |
{ |
| 198 |
struct ccs_env_acl_record *entry; |
| 199 |
size = sizeof(*entry); |
| 200 |
entry = container_of(acl, typeof(*entry), head); |
| 201 |
ccs_put_name(entry->env); |
| 202 |
} |
| 203 |
break; |
| 204 |
case CCS_TYPE_CAPABILITY_ACL: |
| 205 |
{ |
| 206 |
struct ccs_capability_acl_record *entry; |
| 207 |
size = sizeof(*entry); |
| 208 |
entry = container_of(acl, typeof(*entry), head); |
| 209 |
} |
| 210 |
break; |
| 211 |
case CCS_TYPE_SIGNAL_ACL: |
| 212 |
{ |
| 213 |
struct ccs_signal_acl_record *entry; |
| 214 |
size = sizeof(*entry); |
| 215 |
entry = container_of(acl, typeof(*entry), head); |
| 216 |
ccs_put_name(entry->domainname); |
| 217 |
} |
| 218 |
break; |
| 219 |
case CCS_TYPE_EXECUTE_HANDLER: |
| 220 |
case CCS_TYPE_DENIED_EXECUTE_HANDLER: |
| 221 |
{ |
| 222 |
struct ccs_execute_handler_record *entry; |
| 223 |
size = sizeof(*entry); |
| 224 |
entry = container_of(acl, typeof(*entry), head); |
| 225 |
ccs_put_name(entry->handler); |
| 226 |
} |
| 227 |
break; |
| 228 |
case CCS_TYPE_MOUNT_ACL: |
| 229 |
{ |
| 230 |
struct ccs_mount_acl_record *entry; |
| 231 |
size = sizeof(*entry); |
| 232 |
entry = container_of(acl, typeof(*entry), head); |
| 233 |
ccs_put_name_union(&entry->dev_name); |
| 234 |
ccs_put_name_union(&entry->dir_name); |
| 235 |
ccs_put_name_union(&entry->fs_type); |
| 236 |
ccs_put_number_union(&entry->flags); |
| 237 |
} |
| 238 |
break; |
| 239 |
case CCS_TYPE_UMOUNT_ACL: |
| 240 |
{ |
| 241 |
struct ccs_umount_acl_record *entry; |
| 242 |
size = sizeof(*entry); |
| 243 |
entry = container_of(acl, typeof(*entry), head); |
| 244 |
ccs_put_name_union(&entry->dir); |
| 245 |
} |
| 246 |
break; |
| 247 |
case CCS_TYPE_CHROOT_ACL: |
| 248 |
{ |
| 249 |
struct ccs_chroot_acl_record *entry; |
| 250 |
size = sizeof(*entry); |
| 251 |
entry = container_of(acl, typeof(*entry), head); |
| 252 |
ccs_put_name_union(&entry->dir); |
| 253 |
} |
| 254 |
break; |
| 255 |
case CCS_TYPE_PIVOT_ROOT_ACL: |
| 256 |
{ |
| 257 |
struct ccs_pivot_root_acl_record *entry; |
| 258 |
size = sizeof(*entry); |
| 259 |
entry = container_of(acl, typeof(*entry), head); |
| 260 |
ccs_put_name_union(&entry->old_root); |
| 261 |
ccs_put_name_union(&entry->new_root); |
| 262 |
} |
| 263 |
break; |
| 264 |
default: |
| 265 |
size = 0; |
| 266 |
printk(KERN_WARNING "Unknown type\n"); |
| 267 |
break; |
| 268 |
} |
| 269 |
return size; |
| 270 |
} |
| 271 |
|
| 272 |
static size_t ccs_del_domain(struct ccs_domain_info *domain) |
| 273 |
{ |
| 274 |
struct ccs_acl_info *acl; |
| 275 |
struct ccs_acl_info *tmp; |
| 276 |
if (ccs_used_by_task(domain)) |
| 277 |
return 0; |
| 278 |
list_for_each_entry_safe(acl, tmp, &domain->acl_info_list, list) { |
| 279 |
size_t size = ccs_del_acl(acl); |
| 280 |
ccs_memory_free(acl, size); |
| 281 |
} |
| 282 |
ccs_put_name(domain->domainname); |
| 283 |
return sizeof(*domain); |
| 284 |
} |
| 285 |
|
| 286 |
static size_t ccs_del_path_group_member(struct ccs_path_group_member *member) |
| 287 |
{ |
| 288 |
ccs_put_name(member->member_name); |
| 289 |
return sizeof(*member); |
| 290 |
} |
| 291 |
|
| 292 |
static size_t ccs_del_path_group(struct ccs_path_group *group) |
| 293 |
{ |
| 294 |
ccs_put_name(group->group_name); |
| 295 |
return sizeof(*group); |
| 296 |
} |
| 297 |
|
| 298 |
static size_t ccs_del_address_group_member |
| 299 |
(struct ccs_address_group_member *member) |
| 300 |
{ |
| 301 |
if (member->is_ipv6) { |
| 302 |
ccs_put_ipv6_address(member->min.ipv6); |
| 303 |
ccs_put_ipv6_address(member->max.ipv6); |
| 304 |
} |
| 305 |
return sizeof(*member); |
| 306 |
} |
| 307 |
|
| 308 |
static size_t ccs_del_address_group(struct ccs_address_group_entry *group) |
| 309 |
{ |
| 310 |
ccs_put_name(group->group_name); |
| 311 |
return sizeof(*group); |
| 312 |
} |
| 313 |
|
| 314 |
static size_t ccs_del_number_group_member |
| 315 |
(struct ccs_number_group_member *member) |
| 316 |
{ |
| 317 |
return sizeof(*member); |
| 318 |
} |
| 319 |
|
| 320 |
static size_t ccs_del_number_group(struct ccs_number_group *group) |
| 321 |
{ |
| 322 |
ccs_put_name(group->group_name); |
| 323 |
return sizeof(*group); |
| 324 |
} |
| 325 |
|
| 326 |
static size_t ccs_del_reservedport(struct ccs_reserved_entry *ptr) |
| 327 |
{ |
| 328 |
return sizeof(*ptr); |
| 329 |
} |
| 330 |
|
| 331 |
static int ccs_gc_thread(void *unused) |
| 332 |
{ |
| 333 |
static DEFINE_MUTEX(ccs_gc_mutex); |
| 334 |
static LIST_HEAD(ccs_gc_queue); |
| 335 |
if (!mutex_trylock(&ccs_gc_mutex)) |
| 336 |
goto out; |
| 337 |
mutex_lock(&ccs_policy_lock); |
| 338 |
{ |
| 339 |
struct ccs_globally_readable_file_entry *ptr; |
| 340 |
list_for_each_entry_rcu(ptr, &ccs_globally_readable_list, |
| 341 |
list) { |
| 342 |
if (!ptr->is_deleted) |
| 343 |
continue; |
| 344 |
if (ccs_add_to_gc(CCS_ID_GLOBALLY_READABLE, ptr, |
| 345 |
&ccs_gc_queue)) |
| 346 |
list_del_rcu(&ptr->list); |
| 347 |
else |
| 348 |
break; |
| 349 |
} |
| 350 |
} |
| 351 |
{ |
| 352 |
struct ccs_globally_usable_env_entry *ptr; |
| 353 |
list_for_each_entry_rcu(ptr, &ccs_globally_usable_env_list, |
| 354 |
list) { |
| 355 |
if (!ptr->is_deleted) |
| 356 |
continue; |
| 357 |
if (ccs_add_to_gc(CCS_ID_GLOBAL_ENV, ptr, |
| 358 |
&ccs_gc_queue)) |
| 359 |
list_del_rcu(&ptr->list); |
| 360 |
else |
| 361 |
break; |
| 362 |
} |
| 363 |
} |
| 364 |
{ |
| 365 |
struct ccs_pattern_entry *ptr; |
| 366 |
list_for_each_entry_rcu(ptr, &ccs_pattern_list, list) { |
| 367 |
if (!ptr->is_deleted) |
| 368 |
continue; |
| 369 |
if (ccs_add_to_gc(CCS_ID_PATTERN, ptr, |
| 370 |
&ccs_gc_queue)) |
| 371 |
list_del_rcu(&ptr->list); |
| 372 |
else |
| 373 |
break; |
| 374 |
} |
| 375 |
} |
| 376 |
{ |
| 377 |
struct ccs_no_rewrite_entry *ptr; |
| 378 |
list_for_each_entry_rcu(ptr, &ccs_no_rewrite_list, list) { |
| 379 |
if (!ptr->is_deleted) |
| 380 |
continue; |
| 381 |
if (ccs_add_to_gc(CCS_ID_NO_REWRITE, ptr, |
| 382 |
&ccs_gc_queue)) |
| 383 |
list_del_rcu(&ptr->list); |
| 384 |
else |
| 385 |
break; |
| 386 |
} |
| 387 |
} |
| 388 |
{ |
| 389 |
struct ccs_domain_initializer_entry *ptr; |
| 390 |
list_for_each_entry_rcu(ptr, &ccs_domain_initializer_list, |
| 391 |
list) { |
| 392 |
if (!ptr->is_deleted) |
| 393 |
continue; |
| 394 |
if (ccs_add_to_gc(CCS_ID_DOMAIN_INITIALIZER, |
| 395 |
ptr, &ccs_gc_queue)) |
| 396 |
list_del_rcu(&ptr->list); |
| 397 |
else |
| 398 |
break; |
| 399 |
} |
| 400 |
} |
| 401 |
{ |
| 402 |
struct ccs_domain_keeper_entry *ptr; |
| 403 |
list_for_each_entry_rcu(ptr, &ccs_domain_keeper_list, list) { |
| 404 |
if (!ptr->is_deleted) |
| 405 |
continue; |
| 406 |
if (ccs_add_to_gc(CCS_ID_DOMAIN_KEEPER, ptr, |
| 407 |
&ccs_gc_queue)) |
| 408 |
list_del_rcu(&ptr->list); |
| 409 |
else |
| 410 |
break; |
| 411 |
} |
| 412 |
} |
| 413 |
{ |
| 414 |
struct ccs_policy_manager_entry *ptr; |
| 415 |
list_for_each_entry_rcu(ptr, &ccs_policy_manager_list, list) { |
| 416 |
if (!ptr->is_deleted) |
| 417 |
continue; |
| 418 |
if (ccs_add_to_gc(CCS_ID_MANAGER, ptr, &ccs_gc_queue)) |
| 419 |
list_del_rcu(&ptr->list); |
| 420 |
else |
| 421 |
break; |
| 422 |
} |
| 423 |
} |
| 424 |
{ |
| 425 |
struct ccs_aggregator_entry *ptr; |
| 426 |
list_for_each_entry_rcu(ptr, &ccs_aggregator_list, list) { |
| 427 |
if (!ptr->is_deleted) |
| 428 |
continue; |
| 429 |
if (ccs_add_to_gc(CCS_ID_AGGREGATOR, ptr, |
| 430 |
&ccs_gc_queue)) |
| 431 |
list_del_rcu(&ptr->list); |
| 432 |
else |
| 433 |
break; |
| 434 |
} |
| 435 |
} |
| 436 |
{ |
| 437 |
struct ccs_domain_info *domain; |
| 438 |
list_for_each_entry_rcu(domain, &ccs_domain_list, list) { |
| 439 |
struct ccs_acl_info *acl; |
| 440 |
list_for_each_entry_rcu(acl, &domain->acl_info_list, |
| 441 |
list) { |
| 442 |
if (!(acl->type & CCS_ACL_DELETED)) |
| 443 |
continue; |
| 444 |
if (ccs_add_to_gc(CCS_ID_ACL, acl, |
| 445 |
&ccs_gc_queue)) |
| 446 |
list_del_rcu(&acl->list); |
| 447 |
else |
| 448 |
break; |
| 449 |
} |
| 450 |
if (!domain->is_deleted || |
| 451 |
ccs_used_by_task(domain)) |
| 452 |
continue; |
| 453 |
if (ccs_add_to_gc(CCS_ID_DOMAIN, domain, &ccs_gc_queue)) |
| 454 |
list_del_rcu(&domain->list); |
| 455 |
else |
| 456 |
break; |
| 457 |
} |
| 458 |
} |
| 459 |
{ |
| 460 |
struct ccs_path_group *group; |
| 461 |
list_for_each_entry_rcu(group, &ccs_path_group_list, list) { |
| 462 |
struct ccs_path_group_member *member; |
| 463 |
list_for_each_entry_rcu(member, |
| 464 |
&group->path_group_member_list, |
| 465 |
list) { |
| 466 |
if (!member->is_deleted) |
| 467 |
continue; |
| 468 |
if (ccs_add_to_gc(CCS_ID_PATH_GROUP_MEMBER, |
| 469 |
member, &ccs_gc_queue)) |
| 470 |
list_del_rcu(&member->list); |
| 471 |
else |
| 472 |
break; |
| 473 |
} |
| 474 |
if (!list_empty(&group->path_group_member_list) || |
| 475 |
atomic_read(&group->users)) |
| 476 |
continue; |
| 477 |
if (ccs_add_to_gc(CCS_ID_PATH_GROUP, group, |
| 478 |
&ccs_gc_queue)) |
| 479 |
list_del_rcu(&group->list); |
| 480 |
else |
| 481 |
break; |
| 482 |
} |
| 483 |
} |
| 484 |
{ |
| 485 |
struct ccs_address_group_entry *group; |
| 486 |
list_for_each_entry_rcu(group, &ccs_address_group_list, list) { |
| 487 |
struct ccs_address_group_member *member; |
| 488 |
list_for_each_entry_rcu(member, |
| 489 |
&group->address_group_member_list, |
| 490 |
list) { |
| 491 |
if (!member->is_deleted) |
| 492 |
break; |
| 493 |
if (ccs_add_to_gc(CCS_ID_ADDRESS_GROUP_MEMBER, |
| 494 |
member, &ccs_gc_queue)) |
| 495 |
list_del_rcu(&member->list); |
| 496 |
else |
| 497 |
break; |
| 498 |
} |
| 499 |
if (!list_empty(&group->address_group_member_list) || |
| 500 |
atomic_read(&group->users)) |
| 501 |
continue; |
| 502 |
if (ccs_add_to_gc(CCS_ID_ADDRESS_GROUP, group, |
| 503 |
&ccs_gc_queue)) |
| 504 |
list_del_rcu(&group->list); |
| 505 |
else |
| 506 |
break; |
| 507 |
} |
| 508 |
} |
| 509 |
{ |
| 510 |
struct ccs_number_group *group; |
| 511 |
list_for_each_entry_rcu(group, &ccs_number_group_list, list) { |
| 512 |
struct ccs_number_group_member *member; |
| 513 |
list_for_each_entry_rcu(member, |
| 514 |
&group-> |
| 515 |
number_group_member_list, |
| 516 |
list) { |
| 517 |
if (!member->is_deleted) |
| 518 |
continue; |
| 519 |
if (ccs_add_to_gc(CCS_ID_NUMBER_GROUP_MEMBER, |
| 520 |
member, &ccs_gc_queue)) |
| 521 |
list_del_rcu(&member->list); |
| 522 |
else |
| 523 |
break; |
| 524 |
} |
| 525 |
if (!list_empty(&group->number_group_member_list) || |
| 526 |
atomic_read(&group->users)) |
| 527 |
continue; |
| 528 |
if (ccs_add_to_gc(CCS_ID_NUMBER_GROUP, group, |
| 529 |
&ccs_gc_queue)) |
| 530 |
list_del_rcu(&group->list); |
| 531 |
else |
| 532 |
break; |
| 533 |
} |
| 534 |
} |
| 535 |
{ |
| 536 |
struct ccs_reserved_entry *ptr; |
| 537 |
list_for_each_entry_rcu(ptr, &ccs_reservedport_list, list) { |
| 538 |
if (!ptr->is_deleted) |
| 539 |
continue; |
| 540 |
if (ccs_add_to_gc(CCS_ID_RESERVEDPORT, ptr, |
| 541 |
&ccs_gc_queue)) |
| 542 |
list_del_rcu(&ptr->list); |
| 543 |
else |
| 544 |
break; |
| 545 |
} |
| 546 |
} |
| 547 |
mutex_unlock(&ccs_policy_lock); |
| 548 |
if (list_empty(&ccs_gc_queue)) |
| 549 |
goto done; |
| 550 |
synchronize_srcu(&ccs_ss); |
| 551 |
{ |
| 552 |
struct ccs_gc_entry *p; |
| 553 |
struct ccs_gc_entry *tmp; |
| 554 |
size_t size = 0; |
| 555 |
list_for_each_entry_safe(p, tmp, &ccs_gc_queue, list) { |
| 556 |
switch (p->type) { |
| 557 |
case CCS_ID_DOMAIN_INITIALIZER: |
| 558 |
size = ccs_del_domain_initializer(p->element); |
| 559 |
break; |
| 560 |
case CCS_ID_DOMAIN_KEEPER: |
| 561 |
size = ccs_del_domain_keeper(p->element); |
| 562 |
break; |
| 563 |
case CCS_ID_GLOBALLY_READABLE: |
| 564 |
size = ccs_del_allow_read(p->element); |
| 565 |
break; |
| 566 |
case CCS_ID_PATTERN: |
| 567 |
size = ccs_del_file_pattern(p->element); |
| 568 |
break; |
| 569 |
case CCS_ID_NO_REWRITE: |
| 570 |
size = ccs_del_no_rewrite(p->element); |
| 571 |
break; |
| 572 |
case CCS_ID_MANAGER: |
| 573 |
size = ccs_del_manager(p->element); |
| 574 |
break; |
| 575 |
case CCS_ID_GLOBAL_ENV: |
| 576 |
size = ccs_del_allow_env(p->element); |
| 577 |
break; |
| 578 |
case CCS_ID_AGGREGATOR: |
| 579 |
size = ccs_del_aggregator(p->element); |
| 580 |
break; |
| 581 |
case CCS_ID_PATH_GROUP_MEMBER: |
| 582 |
size = ccs_del_path_group_member(p->element); |
| 583 |
break; |
| 584 |
case CCS_ID_PATH_GROUP: |
| 585 |
size = ccs_del_path_group(p->element); |
| 586 |
break; |
| 587 |
case CCS_ID_ADDRESS_GROUP_MEMBER: |
| 588 |
size = ccs_del_address_group_member(p->element); |
| 589 |
break; |
| 590 |
case CCS_ID_ADDRESS_GROUP: |
| 591 |
size = ccs_del_address_group(p->element); |
| 592 |
break; |
| 593 |
case CCS_ID_NUMBER_GROUP_MEMBER: |
| 594 |
size = ccs_del_number_group_member(p->element); |
| 595 |
break; |
| 596 |
case CCS_ID_NUMBER_GROUP: |
| 597 |
size = ccs_del_number_group(p->element); |
| 598 |
break; |
| 599 |
case CCS_ID_RESERVEDPORT: |
| 600 |
size = ccs_del_reservedport(p->element); |
| 601 |
break; |
| 602 |
case CCS_ID_ACL: |
| 603 |
size = ccs_del_acl(p->element); |
| 604 |
break; |
| 605 |
case CCS_ID_DOMAIN: |
| 606 |
size = ccs_del_domain(p->element); |
| 607 |
if (!size) |
| 608 |
continue; |
| 609 |
break; |
| 610 |
default: |
| 611 |
size = 0; |
| 612 |
printk(KERN_WARNING "Unknown type\n"); |
| 613 |
break; |
| 614 |
} |
| 615 |
ccs_memory_free(p->element, size); |
| 616 |
list_del(&p->list); |
| 617 |
kfree(p); |
| 618 |
} |
| 619 |
} |
| 620 |
done: |
| 621 |
mutex_unlock(&ccs_gc_mutex); |
| 622 |
out: |
| 623 |
do_exit(0); |
| 624 |
} |
| 625 |
|
| 626 |
void ccs_run_gc(void) |
| 627 |
{ |
| 628 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 5, 0) |
| 629 |
struct task_struct *task = kthread_create(ccs_gc_thread, NULL, |
| 630 |
"GC for CCS"); |
| 631 |
if (!IS_ERR(task)) |
| 632 |
wake_up_process(task); |
| 633 |
#else |
| 634 |
kernel_thread(ccs_gc_thread, NULL, 0); |
| 635 |
#endif |
| 636 |
} |
| 637 |
|
| 638 |
#ifndef _LINUX_SRCU_H |
| 639 |
|
| 640 |
static DEFINE_SPINLOCK(ccs_counter_lock); |
| 641 |
|
| 642 |
int srcu_read_lock(struct srcu_struct *sp) |
| 643 |
{ |
| 644 |
int idx; |
| 645 |
spin_lock(&ccs_counter_lock); |
| 646 |
idx = sp->counter_idx; |
| 647 |
sp->counter[idx]++; |
| 648 |
spin_unlock(&ccs_counter_lock); |
| 649 |
return idx; |
| 650 |
} |
| 651 |
|
| 652 |
void srcu_read_unlock(struct srcu_struct *sp, const int idx) |
| 653 |
{ |
| 654 |
spin_lock(&ccs_counter_lock); |
| 655 |
sp->counter[idx]--; |
| 656 |
spin_unlock(&ccs_counter_lock); |
| 657 |
} |
| 658 |
|
| 659 |
void synchronize_srcu(struct srcu_struct *sp) |
| 660 |
{ |
| 661 |
int idx; |
| 662 |
int v; |
| 663 |
spin_lock(&ccs_counter_lock); |
| 664 |
idx = sp->counter_idx; |
| 665 |
sp->counter_idx ^= 1; |
| 666 |
v = sp->counter[idx]; |
| 667 |
spin_unlock(&ccs_counter_lock); |
| 668 |
while (v) { |
| 669 |
ssleep(1); |
| 670 |
spin_lock(&ccs_counter_lock); |
| 671 |
v = sp->counter[idx]; |
| 672 |
spin_unlock(&ccs_counter_lock); |
| 673 |
} |
| 674 |
} |
| 675 |
|
| 676 |
#endif |
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