1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0
2 /* 2 /*
3 * security/tomoyo/gc.c 3 * security/tomoyo/gc.c
4 * 4 *
5 * Copyright (C) 2005-2011 NTT DATA CORPORATI 5 * Copyright (C) 2005-2011 NTT DATA CORPORATION
6 */ 6 */
7 7
8 #include "common.h" 8 #include "common.h"
9 #include <linux/kthread.h> 9 #include <linux/kthread.h>
10 #include <linux/slab.h> 10 #include <linux/slab.h>
11 11
12 /** 12 /**
13 * tomoyo_memory_free - Free memory for elemen 13 * tomoyo_memory_free - Free memory for elements.
14 * 14 *
15 * @ptr: Pointer to allocated memory. 15 * @ptr: Pointer to allocated memory.
16 * 16 *
17 * Returns nothing. 17 * Returns nothing.
18 * 18 *
19 * Caller holds tomoyo_policy_lock mutex. 19 * Caller holds tomoyo_policy_lock mutex.
20 */ 20 */
21 static inline void tomoyo_memory_free(void *pt 21 static inline void tomoyo_memory_free(void *ptr)
22 { 22 {
23 tomoyo_memory_used[TOMOYO_MEMORY_POLIC 23 tomoyo_memory_used[TOMOYO_MEMORY_POLICY] -= ksize(ptr);
24 kfree(ptr); 24 kfree(ptr);
25 } 25 }
26 26
27 /* The list for "struct tomoyo_io_buffer". */ 27 /* The list for "struct tomoyo_io_buffer". */
28 static LIST_HEAD(tomoyo_io_buffer_list); 28 static LIST_HEAD(tomoyo_io_buffer_list);
29 /* Lock for protecting tomoyo_io_buffer_list. 29 /* Lock for protecting tomoyo_io_buffer_list. */
30 static DEFINE_SPINLOCK(tomoyo_io_buffer_list_l 30 static DEFINE_SPINLOCK(tomoyo_io_buffer_list_lock);
31 31
32 /** 32 /**
33 * tomoyo_struct_used_by_io_buffer - Check whe 33 * tomoyo_struct_used_by_io_buffer - Check whether the list element is used by /sys/kernel/security/tomoyo/ users or not.
34 * 34 *
35 * @element: Pointer to "struct list_head". 35 * @element: Pointer to "struct list_head".
36 * 36 *
37 * Returns true if @element is used by /sys/ke 37 * Returns true if @element is used by /sys/kernel/security/tomoyo/ users,
38 * false otherwise. 38 * false otherwise.
39 */ 39 */
40 static bool tomoyo_struct_used_by_io_buffer(co 40 static bool tomoyo_struct_used_by_io_buffer(const struct list_head *element)
41 { 41 {
42 struct tomoyo_io_buffer *head; 42 struct tomoyo_io_buffer *head;
43 bool in_use = false; 43 bool in_use = false;
44 44
45 spin_lock(&tomoyo_io_buffer_list_lock) 45 spin_lock(&tomoyo_io_buffer_list_lock);
46 list_for_each_entry(head, &tomoyo_io_b 46 list_for_each_entry(head, &tomoyo_io_buffer_list, list) {
47 head->users++; 47 head->users++;
48 spin_unlock(&tomoyo_io_buffer_ 48 spin_unlock(&tomoyo_io_buffer_list_lock);
49 mutex_lock(&head->io_sem); 49 mutex_lock(&head->io_sem);
50 if (head->r.domain == element 50 if (head->r.domain == element || head->r.group == element ||
51 head->r.acl == element || 51 head->r.acl == element || &head->w.domain->list == element)
52 in_use = true; 52 in_use = true;
53 mutex_unlock(&head->io_sem); 53 mutex_unlock(&head->io_sem);
54 spin_lock(&tomoyo_io_buffer_li 54 spin_lock(&tomoyo_io_buffer_list_lock);
55 head->users--; 55 head->users--;
56 if (in_use) 56 if (in_use)
57 break; 57 break;
58 } 58 }
59 spin_unlock(&tomoyo_io_buffer_list_loc 59 spin_unlock(&tomoyo_io_buffer_list_lock);
60 return in_use; 60 return in_use;
61 } 61 }
62 62
63 /** 63 /**
64 * tomoyo_name_used_by_io_buffer - Check wheth 64 * tomoyo_name_used_by_io_buffer - Check whether the string is used by /sys/kernel/security/tomoyo/ users or not.
65 * 65 *
66 * @string: String to check. 66 * @string: String to check.
67 * 67 *
68 * Returns true if @string is used by /sys/ker 68 * Returns true if @string is used by /sys/kernel/security/tomoyo/ users,
69 * false otherwise. 69 * false otherwise.
70 */ 70 */
71 static bool tomoyo_name_used_by_io_buffer(cons 71 static bool tomoyo_name_used_by_io_buffer(const char *string)
72 { 72 {
73 struct tomoyo_io_buffer *head; 73 struct tomoyo_io_buffer *head;
74 const size_t size = strlen(string) + 1 74 const size_t size = strlen(string) + 1;
75 bool in_use = false; 75 bool in_use = false;
76 76
77 spin_lock(&tomoyo_io_buffer_list_lock) 77 spin_lock(&tomoyo_io_buffer_list_lock);
78 list_for_each_entry(head, &tomoyo_io_b 78 list_for_each_entry(head, &tomoyo_io_buffer_list, list) {
79 int i; 79 int i;
80 80
81 head->users++; 81 head->users++;
82 spin_unlock(&tomoyo_io_buffer_ 82 spin_unlock(&tomoyo_io_buffer_list_lock);
83 mutex_lock(&head->io_sem); 83 mutex_lock(&head->io_sem);
84 for (i = 0; i < TOMOYO_MAX_IO_ 84 for (i = 0; i < TOMOYO_MAX_IO_READ_QUEUE; i++) {
85 const char *w = head-> 85 const char *w = head->r.w[i];
86 86
87 if (w < string || w > 87 if (w < string || w > string + size)
88 continue; 88 continue;
89 in_use = true; 89 in_use = true;
90 break; 90 break;
91 } 91 }
92 mutex_unlock(&head->io_sem); 92 mutex_unlock(&head->io_sem);
93 spin_lock(&tomoyo_io_buffer_li 93 spin_lock(&tomoyo_io_buffer_list_lock);
94 head->users--; 94 head->users--;
95 if (in_use) 95 if (in_use)
96 break; 96 break;
97 } 97 }
98 spin_unlock(&tomoyo_io_buffer_list_loc 98 spin_unlock(&tomoyo_io_buffer_list_lock);
99 return in_use; 99 return in_use;
100 } 100 }
101 101
102 /** 102 /**
103 * tomoyo_del_transition_control - Delete memb 103 * tomoyo_del_transition_control - Delete members in "struct tomoyo_transition_control".
104 * 104 *
105 * @element: Pointer to "struct list_head". 105 * @element: Pointer to "struct list_head".
106 * 106 *
107 * Returns nothing. 107 * Returns nothing.
108 */ 108 */
109 static inline void tomoyo_del_transition_contr 109 static inline void tomoyo_del_transition_control(struct list_head *element)
110 { 110 {
111 struct tomoyo_transition_control *ptr 111 struct tomoyo_transition_control *ptr =
112 container_of(element, typeof(* 112 container_of(element, typeof(*ptr), head.list);
113 113
114 tomoyo_put_name(ptr->domainname); 114 tomoyo_put_name(ptr->domainname);
115 tomoyo_put_name(ptr->program); 115 tomoyo_put_name(ptr->program);
116 } 116 }
117 117
118 /** 118 /**
119 * tomoyo_del_aggregator - Delete members in " 119 * tomoyo_del_aggregator - Delete members in "struct tomoyo_aggregator".
120 * 120 *
121 * @element: Pointer to "struct list_head". 121 * @element: Pointer to "struct list_head".
122 * 122 *
123 * Returns nothing. 123 * Returns nothing.
124 */ 124 */
125 static inline void tomoyo_del_aggregator(struc 125 static inline void tomoyo_del_aggregator(struct list_head *element)
126 { 126 {
127 struct tomoyo_aggregator *ptr = 127 struct tomoyo_aggregator *ptr =
128 container_of(element, typeof(* 128 container_of(element, typeof(*ptr), head.list);
129 129
130 tomoyo_put_name(ptr->original_name); 130 tomoyo_put_name(ptr->original_name);
131 tomoyo_put_name(ptr->aggregated_name); 131 tomoyo_put_name(ptr->aggregated_name);
132 } 132 }
133 133
134 /** 134 /**
135 * tomoyo_del_manager - Delete members in "str 135 * tomoyo_del_manager - Delete members in "struct tomoyo_manager".
136 * 136 *
137 * @element: Pointer to "struct list_head". 137 * @element: Pointer to "struct list_head".
138 * 138 *
139 * Returns nothing. 139 * Returns nothing.
140 */ 140 */
141 static inline void tomoyo_del_manager(struct l 141 static inline void tomoyo_del_manager(struct list_head *element)
142 { 142 {
143 struct tomoyo_manager *ptr = 143 struct tomoyo_manager *ptr =
144 container_of(element, typeof(* 144 container_of(element, typeof(*ptr), head.list);
145 145
146 tomoyo_put_name(ptr->manager); 146 tomoyo_put_name(ptr->manager);
147 } 147 }
148 148
149 /** 149 /**
150 * tomoyo_del_acl - Delete members in "struct 150 * tomoyo_del_acl - Delete members in "struct tomoyo_acl_info".
151 * 151 *
152 * @element: Pointer to "struct list_head". 152 * @element: Pointer to "struct list_head".
153 * 153 *
154 * Returns nothing. 154 * Returns nothing.
155 */ 155 */
156 static void tomoyo_del_acl(struct list_head *e 156 static void tomoyo_del_acl(struct list_head *element)
157 { 157 {
158 struct tomoyo_acl_info *acl = 158 struct tomoyo_acl_info *acl =
159 container_of(element, typeof(* 159 container_of(element, typeof(*acl), list);
160 160
161 tomoyo_put_condition(acl->cond); 161 tomoyo_put_condition(acl->cond);
162 switch (acl->type) { 162 switch (acl->type) {
163 case TOMOYO_TYPE_PATH_ACL: 163 case TOMOYO_TYPE_PATH_ACL:
164 { 164 {
165 struct tomoyo_path_acl 165 struct tomoyo_path_acl *entry
166 = container_of 166 = container_of(acl, typeof(*entry), head);
167 tomoyo_put_name_union( 167 tomoyo_put_name_union(&entry->name);
168 } 168 }
169 break; 169 break;
170 case TOMOYO_TYPE_PATH2_ACL: 170 case TOMOYO_TYPE_PATH2_ACL:
171 { 171 {
172 struct tomoyo_path2_ac 172 struct tomoyo_path2_acl *entry
173 = container_of 173 = container_of(acl, typeof(*entry), head);
174 tomoyo_put_name_union( 174 tomoyo_put_name_union(&entry->name1);
175 tomoyo_put_name_union( 175 tomoyo_put_name_union(&entry->name2);
176 } 176 }
177 break; 177 break;
178 case TOMOYO_TYPE_PATH_NUMBER_ACL: 178 case TOMOYO_TYPE_PATH_NUMBER_ACL:
179 { 179 {
180 struct tomoyo_path_num 180 struct tomoyo_path_number_acl *entry
181 = container_of 181 = container_of(acl, typeof(*entry), head);
182 tomoyo_put_name_union( 182 tomoyo_put_name_union(&entry->name);
183 tomoyo_put_number_unio 183 tomoyo_put_number_union(&entry->number);
184 } 184 }
185 break; 185 break;
186 case TOMOYO_TYPE_MKDEV_ACL: 186 case TOMOYO_TYPE_MKDEV_ACL:
187 { 187 {
188 struct tomoyo_mkdev_ac 188 struct tomoyo_mkdev_acl *entry
189 = container_of 189 = container_of(acl, typeof(*entry), head);
190 tomoyo_put_name_union( 190 tomoyo_put_name_union(&entry->name);
191 tomoyo_put_number_unio 191 tomoyo_put_number_union(&entry->mode);
192 tomoyo_put_number_unio 192 tomoyo_put_number_union(&entry->major);
193 tomoyo_put_number_unio 193 tomoyo_put_number_union(&entry->minor);
194 } 194 }
195 break; 195 break;
196 case TOMOYO_TYPE_MOUNT_ACL: 196 case TOMOYO_TYPE_MOUNT_ACL:
197 { 197 {
198 struct tomoyo_mount_ac 198 struct tomoyo_mount_acl *entry
199 = container_of 199 = container_of(acl, typeof(*entry), head);
200 tomoyo_put_name_union( 200 tomoyo_put_name_union(&entry->dev_name);
201 tomoyo_put_name_union( 201 tomoyo_put_name_union(&entry->dir_name);
202 tomoyo_put_name_union( 202 tomoyo_put_name_union(&entry->fs_type);
203 tomoyo_put_number_unio 203 tomoyo_put_number_union(&entry->flags);
204 } 204 }
205 break; 205 break;
206 case TOMOYO_TYPE_ENV_ACL: 206 case TOMOYO_TYPE_ENV_ACL:
207 { 207 {
208 struct tomoyo_env_acl 208 struct tomoyo_env_acl *entry =
209 container_of(a 209 container_of(acl, typeof(*entry), head);
210 210
211 tomoyo_put_name(entry- 211 tomoyo_put_name(entry->env);
212 } 212 }
213 break; 213 break;
214 case TOMOYO_TYPE_INET_ACL: 214 case TOMOYO_TYPE_INET_ACL:
215 { 215 {
216 struct tomoyo_inet_acl 216 struct tomoyo_inet_acl *entry =
217 container_of(a 217 container_of(acl, typeof(*entry), head);
218 218
219 tomoyo_put_group(entry 219 tomoyo_put_group(entry->address.group);
220 tomoyo_put_number_unio 220 tomoyo_put_number_union(&entry->port);
221 } 221 }
222 break; 222 break;
223 case TOMOYO_TYPE_UNIX_ACL: 223 case TOMOYO_TYPE_UNIX_ACL:
224 { 224 {
225 struct tomoyo_unix_acl 225 struct tomoyo_unix_acl *entry =
226 container_of(a 226 container_of(acl, typeof(*entry), head);
227 227
228 tomoyo_put_name_union( 228 tomoyo_put_name_union(&entry->name);
229 } 229 }
230 break; 230 break;
231 case TOMOYO_TYPE_MANUAL_TASK_ACL: 231 case TOMOYO_TYPE_MANUAL_TASK_ACL:
232 { 232 {
233 struct tomoyo_task_acl 233 struct tomoyo_task_acl *entry =
234 container_of(a 234 container_of(acl, typeof(*entry), head);
235 235
236 tomoyo_put_name(entry- 236 tomoyo_put_name(entry->domainname);
237 } 237 }
238 break; 238 break;
239 } 239 }
240 } 240 }
241 241
242 /** 242 /**
243 * tomoyo_del_domain - Delete members in "stru 243 * tomoyo_del_domain - Delete members in "struct tomoyo_domain_info".
244 * 244 *
245 * @element: Pointer to "struct list_head". 245 * @element: Pointer to "struct list_head".
246 * 246 *
247 * Returns nothing. 247 * Returns nothing.
248 * 248 *
249 * Caller holds tomoyo_policy_lock mutex. 249 * Caller holds tomoyo_policy_lock mutex.
250 */ 250 */
251 static inline void tomoyo_del_domain(struct li 251 static inline void tomoyo_del_domain(struct list_head *element)
252 { 252 {
253 struct tomoyo_domain_info *domain = 253 struct tomoyo_domain_info *domain =
254 container_of(element, typeof(* 254 container_of(element, typeof(*domain), list);
255 struct tomoyo_acl_info *acl; 255 struct tomoyo_acl_info *acl;
256 struct tomoyo_acl_info *tmp; 256 struct tomoyo_acl_info *tmp;
257 257
258 /* 258 /*
259 * Since this domain is referenced fro 259 * Since this domain is referenced from neither
260 * "struct tomoyo_io_buffer" nor "stru 260 * "struct tomoyo_io_buffer" nor "struct cred"->security, we can delete
261 * elements without checking for is_de 261 * elements without checking for is_deleted flag.
262 */ 262 */
263 list_for_each_entry_safe(acl, tmp, &do 263 list_for_each_entry_safe(acl, tmp, &domain->acl_info_list, list) {
264 tomoyo_del_acl(&acl->list); 264 tomoyo_del_acl(&acl->list);
265 tomoyo_memory_free(acl); 265 tomoyo_memory_free(acl);
266 } 266 }
267 tomoyo_put_name(domain->domainname); 267 tomoyo_put_name(domain->domainname);
268 } 268 }
269 269
270 /** 270 /**
271 * tomoyo_del_condition - Delete members in "s 271 * tomoyo_del_condition - Delete members in "struct tomoyo_condition".
272 * 272 *
273 * @element: Pointer to "struct list_head". 273 * @element: Pointer to "struct list_head".
274 * 274 *
275 * Returns nothing. 275 * Returns nothing.
276 */ 276 */
277 void tomoyo_del_condition(struct list_head *el 277 void tomoyo_del_condition(struct list_head *element)
278 { 278 {
279 struct tomoyo_condition *cond = contai 279 struct tomoyo_condition *cond = container_of(element, typeof(*cond),
280 280 head.list);
281 const u16 condc = cond->condc; 281 const u16 condc = cond->condc;
282 const u16 numbers_count = cond->number 282 const u16 numbers_count = cond->numbers_count;
283 const u16 names_count = cond->names_co 283 const u16 names_count = cond->names_count;
284 const u16 argc = cond->argc; 284 const u16 argc = cond->argc;
285 const u16 envc = cond->envc; 285 const u16 envc = cond->envc;
286 unsigned int i; 286 unsigned int i;
287 const struct tomoyo_condition_element 287 const struct tomoyo_condition_element *condp
288 = (const struct tomoyo_conditi 288 = (const struct tomoyo_condition_element *) (cond + 1);
289 struct tomoyo_number_union *numbers_p 289 struct tomoyo_number_union *numbers_p
290 = (struct tomoyo_number_union 290 = (struct tomoyo_number_union *) (condp + condc);
291 struct tomoyo_name_union *names_p 291 struct tomoyo_name_union *names_p
292 = (struct tomoyo_name_union *) 292 = (struct tomoyo_name_union *) (numbers_p + numbers_count);
293 const struct tomoyo_argv *argv 293 const struct tomoyo_argv *argv
294 = (const struct tomoyo_argv *) 294 = (const struct tomoyo_argv *) (names_p + names_count);
295 const struct tomoyo_envp *envp 295 const struct tomoyo_envp *envp
296 = (const struct tomoyo_envp *) 296 = (const struct tomoyo_envp *) (argv + argc);
297 297
298 for (i = 0; i < numbers_count; i++) 298 for (i = 0; i < numbers_count; i++)
299 tomoyo_put_number_union(number 299 tomoyo_put_number_union(numbers_p++);
300 for (i = 0; i < names_count; i++) 300 for (i = 0; i < names_count; i++)
301 tomoyo_put_name_union(names_p+ 301 tomoyo_put_name_union(names_p++);
302 for (i = 0; i < argc; argv++, i++) 302 for (i = 0; i < argc; argv++, i++)
303 tomoyo_put_name(argv->value); 303 tomoyo_put_name(argv->value);
304 for (i = 0; i < envc; envp++, i++) { 304 for (i = 0; i < envc; envp++, i++) {
305 tomoyo_put_name(envp->name); 305 tomoyo_put_name(envp->name);
306 tomoyo_put_name(envp->value); 306 tomoyo_put_name(envp->value);
307 } 307 }
308 } 308 }
309 309
310 /** 310 /**
311 * tomoyo_del_name - Delete members in "struct 311 * tomoyo_del_name - Delete members in "struct tomoyo_name".
312 * 312 *
313 * @element: Pointer to "struct list_head". 313 * @element: Pointer to "struct list_head".
314 * 314 *
315 * Returns nothing. 315 * Returns nothing.
316 */ 316 */
317 static inline void tomoyo_del_name(struct list 317 static inline void tomoyo_del_name(struct list_head *element)
318 { 318 {
319 /* Nothing to do. */ 319 /* Nothing to do. */
320 } 320 }
321 321
322 /** 322 /**
323 * tomoyo_del_path_group - Delete members in " 323 * tomoyo_del_path_group - Delete members in "struct tomoyo_path_group".
324 * 324 *
325 * @element: Pointer to "struct list_head". 325 * @element: Pointer to "struct list_head".
326 * 326 *
327 * Returns nothing. 327 * Returns nothing.
328 */ 328 */
329 static inline void tomoyo_del_path_group(struc 329 static inline void tomoyo_del_path_group(struct list_head *element)
330 { 330 {
331 struct tomoyo_path_group *member = 331 struct tomoyo_path_group *member =
332 container_of(element, typeof(* 332 container_of(element, typeof(*member), head.list);
333 333
334 tomoyo_put_name(member->member_name); 334 tomoyo_put_name(member->member_name);
335 } 335 }
336 336
337 /** 337 /**
338 * tomoyo_del_group - Delete "struct tomoyo_gr 338 * tomoyo_del_group - Delete "struct tomoyo_group".
339 * 339 *
340 * @element: Pointer to "struct list_head". 340 * @element: Pointer to "struct list_head".
341 * 341 *
342 * Returns nothing. 342 * Returns nothing.
343 */ 343 */
344 static inline void tomoyo_del_group(struct lis 344 static inline void tomoyo_del_group(struct list_head *element)
345 { 345 {
346 struct tomoyo_group *group = 346 struct tomoyo_group *group =
347 container_of(element, typeof(* 347 container_of(element, typeof(*group), head.list);
348 348
349 tomoyo_put_name(group->group_name); 349 tomoyo_put_name(group->group_name);
350 } 350 }
351 351
352 /** 352 /**
353 * tomoyo_del_address_group - Delete members i 353 * tomoyo_del_address_group - Delete members in "struct tomoyo_address_group".
354 * 354 *
355 * @element: Pointer to "struct list_head". 355 * @element: Pointer to "struct list_head".
356 * 356 *
357 * Returns nothing. 357 * Returns nothing.
358 */ 358 */
359 static inline void tomoyo_del_address_group(st 359 static inline void tomoyo_del_address_group(struct list_head *element)
360 { 360 {
361 /* Nothing to do. */ 361 /* Nothing to do. */
362 } 362 }
363 363
364 /** 364 /**
365 * tomoyo_del_number_group - Delete members in 365 * tomoyo_del_number_group - Delete members in "struct tomoyo_number_group".
366 * 366 *
367 * @element: Pointer to "struct list_head". 367 * @element: Pointer to "struct list_head".
368 * 368 *
369 * Returns nothing. 369 * Returns nothing.
370 */ 370 */
371 static inline void tomoyo_del_number_group(str 371 static inline void tomoyo_del_number_group(struct list_head *element)
372 { 372 {
373 /* Nothing to do. */ 373 /* Nothing to do. */
374 } 374 }
375 375
376 /** 376 /**
377 * tomoyo_try_to_gc - Try to kfree() an entry. 377 * tomoyo_try_to_gc - Try to kfree() an entry.
378 * 378 *
379 * @type: One of values in "enum tomoyo_pol 379 * @type: One of values in "enum tomoyo_policy_id".
380 * @element: Pointer to "struct list_head". 380 * @element: Pointer to "struct list_head".
381 * 381 *
382 * Returns nothing. 382 * Returns nothing.
383 * 383 *
384 * Caller holds tomoyo_policy_lock mutex. 384 * Caller holds tomoyo_policy_lock mutex.
385 */ 385 */
386 static void tomoyo_try_to_gc(const enum tomoyo 386 static void tomoyo_try_to_gc(const enum tomoyo_policy_id type,
387 struct list_head 387 struct list_head *element)
388 { 388 {
389 /* 389 /*
390 * __list_del_entry() guarantees that 390 * __list_del_entry() guarantees that the list element became no longer
391 * reachable from the list which the e 391 * reachable from the list which the element was originally on (e.g.
392 * tomoyo_domain_list). Also, synchron 392 * tomoyo_domain_list). Also, synchronize_srcu() guarantees that the
393 * list element became no longer refer 393 * list element became no longer referenced by syscall users.
394 */ 394 */
395 __list_del_entry(element); 395 __list_del_entry(element);
396 mutex_unlock(&tomoyo_policy_lock); 396 mutex_unlock(&tomoyo_policy_lock);
397 synchronize_srcu(&tomoyo_ss); 397 synchronize_srcu(&tomoyo_ss);
398 /* 398 /*
399 * However, there are two users which 399 * However, there are two users which may still be using the list
400 * element. We need to defer until bot 400 * element. We need to defer until both users forget this element.
401 * 401 *
402 * Don't kfree() until "struct tomoyo_ 402 * Don't kfree() until "struct tomoyo_io_buffer"->r.{domain,group,acl}
403 * and "struct tomoyo_io_buffer"->w.do 403 * and "struct tomoyo_io_buffer"->w.domain forget this element.
404 */ 404 */
405 if (tomoyo_struct_used_by_io_buffer(el 405 if (tomoyo_struct_used_by_io_buffer(element))
406 goto reinject; 406 goto reinject;
407 switch (type) { 407 switch (type) {
408 case TOMOYO_ID_TRANSITION_CONTROL: 408 case TOMOYO_ID_TRANSITION_CONTROL:
409 tomoyo_del_transition_control( 409 tomoyo_del_transition_control(element);
410 break; 410 break;
411 case TOMOYO_ID_MANAGER: 411 case TOMOYO_ID_MANAGER:
412 tomoyo_del_manager(element); 412 tomoyo_del_manager(element);
413 break; 413 break;
414 case TOMOYO_ID_AGGREGATOR: 414 case TOMOYO_ID_AGGREGATOR:
415 tomoyo_del_aggregator(element) 415 tomoyo_del_aggregator(element);
416 break; 416 break;
417 case TOMOYO_ID_GROUP: 417 case TOMOYO_ID_GROUP:
418 tomoyo_del_group(element); 418 tomoyo_del_group(element);
419 break; 419 break;
420 case TOMOYO_ID_PATH_GROUP: 420 case TOMOYO_ID_PATH_GROUP:
421 tomoyo_del_path_group(element) 421 tomoyo_del_path_group(element);
422 break; 422 break;
423 case TOMOYO_ID_ADDRESS_GROUP: 423 case TOMOYO_ID_ADDRESS_GROUP:
424 tomoyo_del_address_group(eleme 424 tomoyo_del_address_group(element);
425 break; 425 break;
426 case TOMOYO_ID_NUMBER_GROUP: 426 case TOMOYO_ID_NUMBER_GROUP:
427 tomoyo_del_number_group(elemen 427 tomoyo_del_number_group(element);
428 break; 428 break;
429 case TOMOYO_ID_CONDITION: 429 case TOMOYO_ID_CONDITION:
430 tomoyo_del_condition(element); 430 tomoyo_del_condition(element);
431 break; 431 break;
432 case TOMOYO_ID_NAME: 432 case TOMOYO_ID_NAME:
433 /* 433 /*
434 * Don't kfree() until all "st 434 * Don't kfree() until all "struct tomoyo_io_buffer"->r.w[]
435 * forget this element. 435 * forget this element.
436 */ 436 */
437 if (tomoyo_name_used_by_io_buf 437 if (tomoyo_name_used_by_io_buffer
438 (container_of(element, typ 438 (container_of(element, typeof(struct tomoyo_name),
439 head.list)-> 439 head.list)->entry.name))
440 goto reinject; 440 goto reinject;
441 tomoyo_del_name(element); 441 tomoyo_del_name(element);
442 break; 442 break;
443 case TOMOYO_ID_ACL: 443 case TOMOYO_ID_ACL:
444 tomoyo_del_acl(element); 444 tomoyo_del_acl(element);
445 break; 445 break;
446 case TOMOYO_ID_DOMAIN: 446 case TOMOYO_ID_DOMAIN:
447 /* 447 /*
448 * Don't kfree() until all "st 448 * Don't kfree() until all "struct cred"->security forget this
449 * element. 449 * element.
450 */ 450 */
451 if (atomic_read(&container_of 451 if (atomic_read(&container_of
452 (element, type 452 (element, typeof(struct tomoyo_domain_info),
453 list)->users) 453 list)->users))
454 goto reinject; 454 goto reinject;
455 break; 455 break;
456 case TOMOYO_MAX_POLICY: 456 case TOMOYO_MAX_POLICY:
457 break; 457 break;
458 } 458 }
459 mutex_lock(&tomoyo_policy_lock); 459 mutex_lock(&tomoyo_policy_lock);
460 if (type == TOMOYO_ID_DOMAIN) 460 if (type == TOMOYO_ID_DOMAIN)
461 tomoyo_del_domain(element); 461 tomoyo_del_domain(element);
462 tomoyo_memory_free(element); 462 tomoyo_memory_free(element);
463 return; 463 return;
464 reinject: 464 reinject:
465 /* 465 /*
466 * We can safely reinject this element 466 * We can safely reinject this element here because
467 * (1) Appending list elements and rem 467 * (1) Appending list elements and removing list elements are protected
468 * by tomoyo_policy_lock mutex. 468 * by tomoyo_policy_lock mutex.
469 * (2) Only this function removes list 469 * (2) Only this function removes list elements and this function is
470 * exclusively executed by tomoyo_ 470 * exclusively executed by tomoyo_gc_mutex mutex.
471 * are true. 471 * are true.
472 */ 472 */
473 mutex_lock(&tomoyo_policy_lock); 473 mutex_lock(&tomoyo_policy_lock);
474 list_add_rcu(element, element->prev); 474 list_add_rcu(element, element->prev);
475 } 475 }
476 476
477 /** 477 /**
478 * tomoyo_collect_member - Delete elements wit 478 * tomoyo_collect_member - Delete elements with "struct tomoyo_acl_head".
479 * 479 *
480 * @id: One of values in "enum tomoyo 480 * @id: One of values in "enum tomoyo_policy_id".
481 * @member_list: Pointer to "struct list_head" 481 * @member_list: Pointer to "struct list_head".
482 * 482 *
483 * Returns nothing. 483 * Returns nothing.
484 */ 484 */
485 static void tomoyo_collect_member(const enum t 485 static void tomoyo_collect_member(const enum tomoyo_policy_id id,
486 struct list_ 486 struct list_head *member_list)
487 { 487 {
488 struct tomoyo_acl_head *member; 488 struct tomoyo_acl_head *member;
489 struct tomoyo_acl_head *tmp; 489 struct tomoyo_acl_head *tmp;
490 490
491 list_for_each_entry_safe(member, tmp, 491 list_for_each_entry_safe(member, tmp, member_list, list) {
492 if (!member->is_deleted) 492 if (!member->is_deleted)
493 continue; 493 continue;
494 member->is_deleted = TOMOYO_GC 494 member->is_deleted = TOMOYO_GC_IN_PROGRESS;
495 tomoyo_try_to_gc(id, &member-> 495 tomoyo_try_to_gc(id, &member->list);
496 } 496 }
497 } 497 }
498 498
499 /** 499 /**
500 * tomoyo_collect_acl - Delete elements in "st 500 * tomoyo_collect_acl - Delete elements in "struct tomoyo_domain_info".
501 * 501 *
502 * @list: Pointer to "struct list_head". 502 * @list: Pointer to "struct list_head".
503 * 503 *
504 * Returns nothing. 504 * Returns nothing.
505 */ 505 */
506 static void tomoyo_collect_acl(struct list_hea 506 static void tomoyo_collect_acl(struct list_head *list)
507 { 507 {
508 struct tomoyo_acl_info *acl; 508 struct tomoyo_acl_info *acl;
509 struct tomoyo_acl_info *tmp; 509 struct tomoyo_acl_info *tmp;
510 510
511 list_for_each_entry_safe(acl, tmp, lis 511 list_for_each_entry_safe(acl, tmp, list, list) {
512 if (!acl->is_deleted) 512 if (!acl->is_deleted)
513 continue; 513 continue;
514 acl->is_deleted = TOMOYO_GC_IN 514 acl->is_deleted = TOMOYO_GC_IN_PROGRESS;
515 tomoyo_try_to_gc(TOMOYO_ID_ACL 515 tomoyo_try_to_gc(TOMOYO_ID_ACL, &acl->list);
516 } 516 }
517 } 517 }
518 518
519 /** 519 /**
520 * tomoyo_collect_entry - Try to kfree() delet 520 * tomoyo_collect_entry - Try to kfree() deleted elements.
521 * 521 *
522 * Returns nothing. 522 * Returns nothing.
523 */ 523 */
524 static void tomoyo_collect_entry(void) 524 static void tomoyo_collect_entry(void)
525 { 525 {
526 int i; 526 int i;
527 enum tomoyo_policy_id id; 527 enum tomoyo_policy_id id;
528 struct tomoyo_policy_namespace *ns; 528 struct tomoyo_policy_namespace *ns;
529 529
530 mutex_lock(&tomoyo_policy_lock); 530 mutex_lock(&tomoyo_policy_lock);
531 { 531 {
532 struct tomoyo_domain_info *dom 532 struct tomoyo_domain_info *domain;
533 struct tomoyo_domain_info *tmp 533 struct tomoyo_domain_info *tmp;
534 534
535 list_for_each_entry_safe(domai 535 list_for_each_entry_safe(domain, tmp, &tomoyo_domain_list,
536 list) 536 list) {
537 tomoyo_collect_acl(&do 537 tomoyo_collect_acl(&domain->acl_info_list);
538 if (!domain->is_delete 538 if (!domain->is_deleted || atomic_read(&domain->users))
539 continue; 539 continue;
540 tomoyo_try_to_gc(TOMOY 540 tomoyo_try_to_gc(TOMOYO_ID_DOMAIN, &domain->list);
541 } 541 }
542 } 542 }
543 list_for_each_entry(ns, &tomoyo_namesp 543 list_for_each_entry(ns, &tomoyo_namespace_list, namespace_list) {
544 for (id = 0; id < TOMOYO_MAX_P 544 for (id = 0; id < TOMOYO_MAX_POLICY; id++)
545 tomoyo_collect_member( 545 tomoyo_collect_member(id, &ns->policy_list[id]);
546 for (i = 0; i < TOMOYO_MAX_ACL 546 for (i = 0; i < TOMOYO_MAX_ACL_GROUPS; i++)
547 tomoyo_collect_acl(&ns 547 tomoyo_collect_acl(&ns->acl_group[i]);
548 } 548 }
549 { 549 {
550 struct tomoyo_shared_acl_head 550 struct tomoyo_shared_acl_head *ptr;
551 struct tomoyo_shared_acl_head 551 struct tomoyo_shared_acl_head *tmp;
552 552
553 list_for_each_entry_safe(ptr, 553 list_for_each_entry_safe(ptr, tmp, &tomoyo_condition_list,
554 list) 554 list) {
555 if (atomic_read(&ptr-> 555 if (atomic_read(&ptr->users) > 0)
556 continue; 556 continue;
557 atomic_set(&ptr->users 557 atomic_set(&ptr->users, TOMOYO_GC_IN_PROGRESS);
558 tomoyo_try_to_gc(TOMOY 558 tomoyo_try_to_gc(TOMOYO_ID_CONDITION, &ptr->list);
559 } 559 }
560 } 560 }
561 list_for_each_entry(ns, &tomoyo_namesp 561 list_for_each_entry(ns, &tomoyo_namespace_list, namespace_list) {
562 for (i = 0; i < TOMOYO_MAX_GRO 562 for (i = 0; i < TOMOYO_MAX_GROUP; i++) {
563 struct list_head *list 563 struct list_head *list = &ns->group_list[i];
564 struct tomoyo_group *g 564 struct tomoyo_group *group;
565 struct tomoyo_group *t 565 struct tomoyo_group *tmp;
566 566
567 switch (i) { 567 switch (i) {
568 case 0: 568 case 0:
569 id = TOMOYO_ID 569 id = TOMOYO_ID_PATH_GROUP;
570 break; 570 break;
571 case 1: 571 case 1:
572 id = TOMOYO_ID 572 id = TOMOYO_ID_NUMBER_GROUP;
573 break; 573 break;
574 default: 574 default:
575 id = TOMOYO_ID 575 id = TOMOYO_ID_ADDRESS_GROUP;
576 break; 576 break;
577 } 577 }
578 list_for_each_entry_sa 578 list_for_each_entry_safe(group, tmp, list, head.list) {
579 tomoyo_collect 579 tomoyo_collect_member(id, &group->member_list);
580 if (!list_empt 580 if (!list_empty(&group->member_list) ||
581 atomic_rea 581 atomic_read(&group->head.users) > 0)
582 contin 582 continue;
583 atomic_set(&gr 583 atomic_set(&group->head.users,
584 TOM 584 TOMOYO_GC_IN_PROGRESS);
585 tomoyo_try_to_ 585 tomoyo_try_to_gc(TOMOYO_ID_GROUP,
586 586 &group->head.list);
587 } 587 }
588 } 588 }
589 } 589 }
590 for (i = 0; i < TOMOYO_MAX_HASH; i++) 590 for (i = 0; i < TOMOYO_MAX_HASH; i++) {
591 struct list_head *list = &tomo 591 struct list_head *list = &tomoyo_name_list[i];
592 struct tomoyo_shared_acl_head 592 struct tomoyo_shared_acl_head *ptr;
593 struct tomoyo_shared_acl_head 593 struct tomoyo_shared_acl_head *tmp;
594 594
595 list_for_each_entry_safe(ptr, 595 list_for_each_entry_safe(ptr, tmp, list, list) {
596 if (atomic_read(&ptr-> 596 if (atomic_read(&ptr->users) > 0)
597 continue; 597 continue;
598 atomic_set(&ptr->users 598 atomic_set(&ptr->users, TOMOYO_GC_IN_PROGRESS);
599 tomoyo_try_to_gc(TOMOY 599 tomoyo_try_to_gc(TOMOYO_ID_NAME, &ptr->list);
600 } 600 }
601 } 601 }
602 mutex_unlock(&tomoyo_policy_lock); 602 mutex_unlock(&tomoyo_policy_lock);
603 } 603 }
604 604
605 /** 605 /**
606 * tomoyo_gc_thread - Garbage collector thread 606 * tomoyo_gc_thread - Garbage collector thread function.
607 * 607 *
608 * @unused: Unused. 608 * @unused: Unused.
609 * 609 *
610 * Returns 0. 610 * Returns 0.
611 */ 611 */
612 static int tomoyo_gc_thread(void *unused) 612 static int tomoyo_gc_thread(void *unused)
613 { 613 {
614 /* Garbage collector thread is exclusi 614 /* Garbage collector thread is exclusive. */
615 static DEFINE_MUTEX(tomoyo_gc_mutex); 615 static DEFINE_MUTEX(tomoyo_gc_mutex);
616 616
617 if (!mutex_trylock(&tomoyo_gc_mutex)) 617 if (!mutex_trylock(&tomoyo_gc_mutex))
618 goto out; 618 goto out;
619 tomoyo_collect_entry(); 619 tomoyo_collect_entry();
620 { 620 {
621 struct tomoyo_io_buffer *head; 621 struct tomoyo_io_buffer *head;
622 struct tomoyo_io_buffer *tmp; 622 struct tomoyo_io_buffer *tmp;
623 623
624 spin_lock(&tomoyo_io_buffer_li 624 spin_lock(&tomoyo_io_buffer_list_lock);
625 list_for_each_entry_safe(head, 625 list_for_each_entry_safe(head, tmp, &tomoyo_io_buffer_list,
626 list) 626 list) {
627 if (head->users) 627 if (head->users)
628 continue; 628 continue;
629 list_del(&head->list); 629 list_del(&head->list);
630 kfree(head->read_buf); 630 kfree(head->read_buf);
631 kfree(head->write_buf) 631 kfree(head->write_buf);
632 kfree(head); 632 kfree(head);
633 } 633 }
634 spin_unlock(&tomoyo_io_buffer_ 634 spin_unlock(&tomoyo_io_buffer_list_lock);
635 } 635 }
636 mutex_unlock(&tomoyo_gc_mutex); 636 mutex_unlock(&tomoyo_gc_mutex);
637 out: 637 out:
638 /* This acts as do_exit(0). */ 638 /* This acts as do_exit(0). */
639 return 0; 639 return 0;
640 } 640 }
641 641
642 /** 642 /**
643 * tomoyo_notify_gc - Register/unregister /sys 643 * tomoyo_notify_gc - Register/unregister /sys/kernel/security/tomoyo/ users.
644 * 644 *
645 * @head: Pointer to "struct tomoyo_io_ 645 * @head: Pointer to "struct tomoyo_io_buffer".
646 * @is_register: True if register, false if un 646 * @is_register: True if register, false if unregister.
647 * 647 *
648 * Returns nothing. 648 * Returns nothing.
649 */ 649 */
650 void tomoyo_notify_gc(struct tomoyo_io_buffer 650 void tomoyo_notify_gc(struct tomoyo_io_buffer *head, const bool is_register)
651 { 651 {
652 bool is_write = false; 652 bool is_write = false;
653 653
654 spin_lock(&tomoyo_io_buffer_list_lock) 654 spin_lock(&tomoyo_io_buffer_list_lock);
655 if (is_register) { 655 if (is_register) {
656 head->users = 1; 656 head->users = 1;
657 list_add(&head->list, &tomoyo_ 657 list_add(&head->list, &tomoyo_io_buffer_list);
658 } else { 658 } else {
659 is_write = head->write_buf != 659 is_write = head->write_buf != NULL;
660 if (!--head->users) { 660 if (!--head->users) {
661 list_del(&head->list); 661 list_del(&head->list);
662 kfree(head->read_buf); 662 kfree(head->read_buf);
663 kfree(head->write_buf) 663 kfree(head->write_buf);
664 kfree(head); 664 kfree(head);
665 } 665 }
666 } 666 }
667 spin_unlock(&tomoyo_io_buffer_list_loc 667 spin_unlock(&tomoyo_io_buffer_list_lock);
668 if (is_write) 668 if (is_write)
669 kthread_run(tomoyo_gc_thread, 669 kthread_run(tomoyo_gc_thread, NULL, "GC for TOMOYO");
670 } 670 }
671 671
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.