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