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Commit | Line | Data |
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1 | /* | |
2 | * security/tomoyo/domain.c | |
3 | * | |
4 | * Domain transition functions for TOMOYO. | |
5 | * | |
6 | * Copyright (C) 2005-2010 NTT DATA CORPORATION | |
7 | */ | |
8 | ||
9 | #include "common.h" | |
10 | #include <linux/binfmts.h> | |
11 | #include <linux/slab.h> | |
12 | ||
13 | /* Variables definitions.*/ | |
14 | ||
15 | /* The initial domain. */ | |
16 | struct tomoyo_domain_info tomoyo_kernel_domain; | |
17 | ||
18 | /** | |
19 | * tomoyo_update_policy - Update an entry for exception policy. | |
20 | * | |
21 | * @new_entry: Pointer to "struct tomoyo_acl_info". | |
22 | * @size: Size of @new_entry in bytes. | |
23 | * @is_delete: True if it is a delete request. | |
24 | * @list: Pointer to "struct list_head". | |
25 | * @check_duplicate: Callback function to find duplicated entry. | |
26 | * | |
27 | * Returns 0 on success, negative value otherwise. | |
28 | * | |
29 | * Caller holds tomoyo_read_lock(). | |
30 | */ | |
31 | int tomoyo_update_policy(struct tomoyo_acl_head *new_entry, const int size, | |
32 | bool is_delete, struct list_head *list, | |
33 | bool (*check_duplicate) (const struct tomoyo_acl_head | |
34 | *, | |
35 | const struct tomoyo_acl_head | |
36 | *)) | |
37 | { | |
38 | int error = is_delete ? -ENOENT : -ENOMEM; | |
39 | struct tomoyo_acl_head *entry; | |
40 | ||
41 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) | |
42 | return -ENOMEM; | |
43 | list_for_each_entry_rcu(entry, list, list) { | |
44 | if (!check_duplicate(entry, new_entry)) | |
45 | continue; | |
46 | entry->is_deleted = is_delete; | |
47 | error = 0; | |
48 | break; | |
49 | } | |
50 | if (error && !is_delete) { | |
51 | entry = tomoyo_commit_ok(new_entry, size); | |
52 | if (entry) { | |
53 | list_add_tail_rcu(&entry->list, list); | |
54 | error = 0; | |
55 | } | |
56 | } | |
57 | mutex_unlock(&tomoyo_policy_lock); | |
58 | return error; | |
59 | } | |
60 | ||
61 | /** | |
62 | * tomoyo_update_domain - Update an entry for domain policy. | |
63 | * | |
64 | * @new_entry: Pointer to "struct tomoyo_acl_info". | |
65 | * @size: Size of @new_entry in bytes. | |
66 | * @is_delete: True if it is a delete request. | |
67 | * @domain: Pointer to "struct tomoyo_domain_info". | |
68 | * @check_duplicate: Callback function to find duplicated entry. | |
69 | * @merge_duplicate: Callback function to merge duplicated entry. | |
70 | * | |
71 | * Returns 0 on success, negative value otherwise. | |
72 | * | |
73 | * Caller holds tomoyo_read_lock(). | |
74 | */ | |
75 | int tomoyo_update_domain(struct tomoyo_acl_info *new_entry, const int size, | |
76 | bool is_delete, struct tomoyo_domain_info *domain, | |
77 | bool (*check_duplicate) (const struct tomoyo_acl_info | |
78 | *, | |
79 | const struct tomoyo_acl_info | |
80 | *), | |
81 | bool (*merge_duplicate) (struct tomoyo_acl_info *, | |
82 | struct tomoyo_acl_info *, | |
83 | const bool)) | |
84 | { | |
85 | int error = is_delete ? -ENOENT : -ENOMEM; | |
86 | struct tomoyo_acl_info *entry; | |
87 | ||
88 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) | |
89 | return error; | |
90 | list_for_each_entry_rcu(entry, &domain->acl_info_list, list) { | |
91 | if (!check_duplicate(entry, new_entry)) | |
92 | continue; | |
93 | if (merge_duplicate) | |
94 | entry->is_deleted = merge_duplicate(entry, new_entry, | |
95 | is_delete); | |
96 | else | |
97 | entry->is_deleted = is_delete; | |
98 | error = 0; | |
99 | break; | |
100 | } | |
101 | if (error && !is_delete) { | |
102 | entry = tomoyo_commit_ok(new_entry, size); | |
103 | if (entry) { | |
104 | list_add_tail_rcu(&entry->list, &domain->acl_info_list); | |
105 | error = 0; | |
106 | } | |
107 | } | |
108 | mutex_unlock(&tomoyo_policy_lock); | |
109 | return error; | |
110 | } | |
111 | ||
112 | void tomoyo_check_acl(struct tomoyo_request_info *r, | |
113 | bool (*check_entry) (const struct tomoyo_request_info *, | |
114 | const struct tomoyo_acl_info *)) | |
115 | { | |
116 | const struct tomoyo_domain_info *domain = r->domain; | |
117 | struct tomoyo_acl_info *ptr; | |
118 | ||
119 | list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { | |
120 | if (ptr->is_deleted || ptr->type != r->param_type) | |
121 | continue; | |
122 | if (check_entry(r, ptr)) { | |
123 | r->granted = true; | |
124 | return; | |
125 | } | |
126 | } | |
127 | r->granted = false; | |
128 | } | |
129 | ||
130 | /* The list for "struct tomoyo_domain_info". */ | |
131 | LIST_HEAD(tomoyo_domain_list); | |
132 | ||
133 | struct list_head tomoyo_policy_list[TOMOYO_MAX_POLICY]; | |
134 | struct list_head tomoyo_group_list[TOMOYO_MAX_GROUP]; | |
135 | ||
136 | /** | |
137 | * tomoyo_get_last_name - Get last component of a domainname. | |
138 | * | |
139 | * @domain: Pointer to "struct tomoyo_domain_info". | |
140 | * | |
141 | * Returns the last component of the domainname. | |
142 | */ | |
143 | const char *tomoyo_get_last_name(const struct tomoyo_domain_info *domain) | |
144 | { | |
145 | const char *cp0 = domain->domainname->name; | |
146 | const char *cp1 = strrchr(cp0, ' '); | |
147 | ||
148 | if (cp1) | |
149 | return cp1 + 1; | |
150 | return cp0; | |
151 | } | |
152 | ||
153 | static bool tomoyo_same_domain_initializer_entry(const struct tomoyo_acl_head * | |
154 | a, | |
155 | const struct tomoyo_acl_head * | |
156 | b) | |
157 | { | |
158 | const struct tomoyo_domain_initializer_entry *p1 = | |
159 | container_of(a, typeof(*p1), head); | |
160 | const struct tomoyo_domain_initializer_entry *p2 = | |
161 | container_of(b, typeof(*p2), head); | |
162 | return p1->is_not == p2->is_not && p1->is_last_name == p2->is_last_name | |
163 | && p1->domainname == p2->domainname | |
164 | && p1->program == p2->program; | |
165 | } | |
166 | ||
167 | /** | |
168 | * tomoyo_update_domain_initializer_entry - Update "struct tomoyo_domain_initializer_entry" list. | |
169 | * | |
170 | * @domainname: The name of domain. May be NULL. | |
171 | * @program: The name of program. | |
172 | * @is_not: True if it is "no_initialize_domain" entry. | |
173 | * @is_delete: True if it is a delete request. | |
174 | * | |
175 | * Returns 0 on success, negative value otherwise. | |
176 | * | |
177 | * Caller holds tomoyo_read_lock(). | |
178 | */ | |
179 | static int tomoyo_update_domain_initializer_entry(const char *domainname, | |
180 | const char *program, | |
181 | const bool is_not, | |
182 | const bool is_delete) | |
183 | { | |
184 | struct tomoyo_domain_initializer_entry e = { .is_not = is_not }; | |
185 | int error = is_delete ? -ENOENT : -ENOMEM; | |
186 | ||
187 | if (!tomoyo_correct_path(program)) | |
188 | return -EINVAL; | |
189 | if (domainname) { | |
190 | if (!tomoyo_domain_def(domainname) && | |
191 | tomoyo_correct_path(domainname)) | |
192 | e.is_last_name = true; | |
193 | else if (!tomoyo_correct_domain(domainname)) | |
194 | return -EINVAL; | |
195 | e.domainname = tomoyo_get_name(domainname); | |
196 | if (!e.domainname) | |
197 | goto out; | |
198 | } | |
199 | e.program = tomoyo_get_name(program); | |
200 | if (!e.program) | |
201 | goto out; | |
202 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, | |
203 | &tomoyo_policy_list | |
204 | [TOMOYO_ID_DOMAIN_INITIALIZER], | |
205 | tomoyo_same_domain_initializer_entry); | |
206 | out: | |
207 | tomoyo_put_name(e.domainname); | |
208 | tomoyo_put_name(e.program); | |
209 | return error; | |
210 | } | |
211 | ||
212 | /** | |
213 | * tomoyo_write_domain_initializer_policy - Write "struct tomoyo_domain_initializer_entry" list. | |
214 | * | |
215 | * @data: String to parse. | |
216 | * @is_not: True if it is "no_initialize_domain" entry. | |
217 | * @is_delete: True if it is a delete request. | |
218 | * | |
219 | * Returns 0 on success, negative value otherwise. | |
220 | * | |
221 | * Caller holds tomoyo_read_lock(). | |
222 | */ | |
223 | int tomoyo_write_domain_initializer_policy(char *data, const bool is_not, | |
224 | const bool is_delete) | |
225 | { | |
226 | char *cp = strstr(data, " from "); | |
227 | ||
228 | if (cp) { | |
229 | *cp = '\0'; | |
230 | return tomoyo_update_domain_initializer_entry(cp + 6, data, | |
231 | is_not, | |
232 | is_delete); | |
233 | } | |
234 | return tomoyo_update_domain_initializer_entry(NULL, data, is_not, | |
235 | is_delete); | |
236 | } | |
237 | ||
238 | /** | |
239 | * tomoyo_domain_initializer - Check whether the given program causes domainname reinitialization. | |
240 | * | |
241 | * @domainname: The name of domain. | |
242 | * @program: The name of program. | |
243 | * @last_name: The last component of @domainname. | |
244 | * | |
245 | * Returns true if executing @program reinitializes domain transition, | |
246 | * false otherwise. | |
247 | * | |
248 | * Caller holds tomoyo_read_lock(). | |
249 | */ | |
250 | static bool tomoyo_domain_initializer(const struct tomoyo_path_info * | |
251 | domainname, | |
252 | const struct tomoyo_path_info *program, | |
253 | const struct tomoyo_path_info * | |
254 | last_name) | |
255 | { | |
256 | struct tomoyo_domain_initializer_entry *ptr; | |
257 | bool flag = false; | |
258 | ||
259 | list_for_each_entry_rcu(ptr, &tomoyo_policy_list | |
260 | [TOMOYO_ID_DOMAIN_INITIALIZER], head.list) { | |
261 | if (ptr->head.is_deleted) | |
262 | continue; | |
263 | if (ptr->domainname) { | |
264 | if (!ptr->is_last_name) { | |
265 | if (ptr->domainname != domainname) | |
266 | continue; | |
267 | } else { | |
268 | if (tomoyo_pathcmp(ptr->domainname, last_name)) | |
269 | continue; | |
270 | } | |
271 | } | |
272 | if (tomoyo_pathcmp(ptr->program, program)) | |
273 | continue; | |
274 | if (ptr->is_not) { | |
275 | flag = false; | |
276 | break; | |
277 | } | |
278 | flag = true; | |
279 | } | |
280 | return flag; | |
281 | } | |
282 | ||
283 | static bool tomoyo_same_domain_keeper_entry(const struct tomoyo_acl_head *a, | |
284 | const struct tomoyo_acl_head *b) | |
285 | { | |
286 | const struct tomoyo_domain_keeper_entry *p1 = | |
287 | container_of(a, typeof(*p1), head); | |
288 | const struct tomoyo_domain_keeper_entry *p2 = | |
289 | container_of(b, typeof(*p2), head); | |
290 | return p1->is_not == p2->is_not && p1->is_last_name == p2->is_last_name | |
291 | && p1->domainname == p2->domainname | |
292 | && p1->program == p2->program; | |
293 | } | |
294 | ||
295 | /** | |
296 | * tomoyo_update_domain_keeper_entry - Update "struct tomoyo_domain_keeper_entry" list. | |
297 | * | |
298 | * @domainname: The name of domain. | |
299 | * @program: The name of program. May be NULL. | |
300 | * @is_not: True if it is "no_keep_domain" entry. | |
301 | * @is_delete: True if it is a delete request. | |
302 | * | |
303 | * Returns 0 on success, negative value otherwise. | |
304 | * | |
305 | * Caller holds tomoyo_read_lock(). | |
306 | */ | |
307 | static int tomoyo_update_domain_keeper_entry(const char *domainname, | |
308 | const char *program, | |
309 | const bool is_not, | |
310 | const bool is_delete) | |
311 | { | |
312 | struct tomoyo_domain_keeper_entry e = { .is_not = is_not }; | |
313 | int error = is_delete ? -ENOENT : -ENOMEM; | |
314 | ||
315 | if (!tomoyo_domain_def(domainname) && | |
316 | tomoyo_correct_path(domainname)) | |
317 | e.is_last_name = true; | |
318 | else if (!tomoyo_correct_domain(domainname)) | |
319 | return -EINVAL; | |
320 | if (program) { | |
321 | if (!tomoyo_correct_path(program)) | |
322 | return -EINVAL; | |
323 | e.program = tomoyo_get_name(program); | |
324 | if (!e.program) | |
325 | goto out; | |
326 | } | |
327 | e.domainname = tomoyo_get_name(domainname); | |
328 | if (!e.domainname) | |
329 | goto out; | |
330 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, | |
331 | &tomoyo_policy_list | |
332 | [TOMOYO_ID_DOMAIN_KEEPER], | |
333 | tomoyo_same_domain_keeper_entry); | |
334 | out: | |
335 | tomoyo_put_name(e.domainname); | |
336 | tomoyo_put_name(e.program); | |
337 | return error; | |
338 | } | |
339 | ||
340 | /** | |
341 | * tomoyo_write_domain_keeper_policy - Write "struct tomoyo_domain_keeper_entry" list. | |
342 | * | |
343 | * @data: String to parse. | |
344 | * @is_not: True if it is "no_keep_domain" entry. | |
345 | * @is_delete: True if it is a delete request. | |
346 | * | |
347 | * Caller holds tomoyo_read_lock(). | |
348 | */ | |
349 | int tomoyo_write_domain_keeper_policy(char *data, const bool is_not, | |
350 | const bool is_delete) | |
351 | { | |
352 | char *cp = strstr(data, " from "); | |
353 | ||
354 | if (cp) { | |
355 | *cp = '\0'; | |
356 | return tomoyo_update_domain_keeper_entry(cp + 6, data, is_not, | |
357 | is_delete); | |
358 | } | |
359 | return tomoyo_update_domain_keeper_entry(data, NULL, is_not, is_delete); | |
360 | } | |
361 | ||
362 | /** | |
363 | * tomoyo_domain_keeper - Check whether the given program causes domain transition suppression. | |
364 | * | |
365 | * @domainname: The name of domain. | |
366 | * @program: The name of program. | |
367 | * @last_name: The last component of @domainname. | |
368 | * | |
369 | * Returns true if executing @program supresses domain transition, | |
370 | * false otherwise. | |
371 | * | |
372 | * Caller holds tomoyo_read_lock(). | |
373 | */ | |
374 | static bool tomoyo_domain_keeper(const struct tomoyo_path_info *domainname, | |
375 | const struct tomoyo_path_info *program, | |
376 | const struct tomoyo_path_info *last_name) | |
377 | { | |
378 | struct tomoyo_domain_keeper_entry *ptr; | |
379 | bool flag = false; | |
380 | ||
381 | list_for_each_entry_rcu(ptr, | |
382 | &tomoyo_policy_list[TOMOYO_ID_DOMAIN_KEEPER], | |
383 | head.list) { | |
384 | if (ptr->head.is_deleted) | |
385 | continue; | |
386 | if (!ptr->is_last_name) { | |
387 | if (ptr->domainname != domainname) | |
388 | continue; | |
389 | } else { | |
390 | if (tomoyo_pathcmp(ptr->domainname, last_name)) | |
391 | continue; | |
392 | } | |
393 | if (ptr->program && tomoyo_pathcmp(ptr->program, program)) | |
394 | continue; | |
395 | if (ptr->is_not) { | |
396 | flag = false; | |
397 | break; | |
398 | } | |
399 | flag = true; | |
400 | } | |
401 | return flag; | |
402 | } | |
403 | ||
404 | static bool tomoyo_same_aggregator_entry(const struct tomoyo_acl_head *a, | |
405 | const struct tomoyo_acl_head *b) | |
406 | { | |
407 | const struct tomoyo_aggregator_entry *p1 = container_of(a, typeof(*p1), | |
408 | head); | |
409 | const struct tomoyo_aggregator_entry *p2 = container_of(b, typeof(*p2), | |
410 | head); | |
411 | return p1->original_name == p2->original_name && | |
412 | p1->aggregated_name == p2->aggregated_name; | |
413 | } | |
414 | ||
415 | /** | |
416 | * tomoyo_update_aggregator_entry - Update "struct tomoyo_aggregator_entry" list. | |
417 | * | |
418 | * @original_name: The original program's name. | |
419 | * @aggregated_name: The program name to use. | |
420 | * @is_delete: True if it is a delete request. | |
421 | * | |
422 | * Returns 0 on success, negative value otherwise. | |
423 | * | |
424 | * Caller holds tomoyo_read_lock(). | |
425 | */ | |
426 | static int tomoyo_update_aggregator_entry(const char *original_name, | |
427 | const char *aggregated_name, | |
428 | const bool is_delete) | |
429 | { | |
430 | struct tomoyo_aggregator_entry e = { }; | |
431 | int error = is_delete ? -ENOENT : -ENOMEM; | |
432 | ||
433 | if (!tomoyo_correct_path(original_name) || | |
434 | !tomoyo_correct_path(aggregated_name)) | |
435 | return -EINVAL; | |
436 | e.original_name = tomoyo_get_name(original_name); | |
437 | e.aggregated_name = tomoyo_get_name(aggregated_name); | |
438 | if (!e.original_name || !e.aggregated_name || | |
439 | e.aggregated_name->is_patterned) /* No patterns allowed. */ | |
440 | goto out; | |
441 | error = tomoyo_update_policy(&e.head, sizeof(e), is_delete, | |
442 | &tomoyo_policy_list[TOMOYO_ID_AGGREGATOR], | |
443 | tomoyo_same_aggregator_entry); | |
444 | out: | |
445 | tomoyo_put_name(e.original_name); | |
446 | tomoyo_put_name(e.aggregated_name); | |
447 | return error; | |
448 | } | |
449 | ||
450 | /** | |
451 | * tomoyo_write_aggregator_policy - Write "struct tomoyo_aggregator_entry" list. | |
452 | * | |
453 | * @data: String to parse. | |
454 | * @is_delete: True if it is a delete request. | |
455 | * | |
456 | * Returns 0 on success, negative value otherwise. | |
457 | * | |
458 | * Caller holds tomoyo_read_lock(). | |
459 | */ | |
460 | int tomoyo_write_aggregator_policy(char *data, const bool is_delete) | |
461 | { | |
462 | char *cp = strchr(data, ' '); | |
463 | ||
464 | if (!cp) | |
465 | return -EINVAL; | |
466 | *cp++ = '\0'; | |
467 | return tomoyo_update_aggregator_entry(data, cp, is_delete); | |
468 | } | |
469 | ||
470 | /** | |
471 | * tomoyo_find_or_assign_new_domain - Create a domain. | |
472 | * | |
473 | * @domainname: The name of domain. | |
474 | * @profile: Profile number to assign if the domain was newly created. | |
475 | * | |
476 | * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise. | |
477 | * | |
478 | * Caller holds tomoyo_read_lock(). | |
479 | */ | |
480 | struct tomoyo_domain_info *tomoyo_find_or_assign_new_domain(const char * | |
481 | domainname, | |
482 | const u8 profile) | |
483 | { | |
484 | struct tomoyo_domain_info *entry; | |
485 | struct tomoyo_domain_info *domain = NULL; | |
486 | const struct tomoyo_path_info *saved_domainname; | |
487 | bool found = false; | |
488 | ||
489 | if (!tomoyo_correct_domain(domainname)) | |
490 | return NULL; | |
491 | saved_domainname = tomoyo_get_name(domainname); | |
492 | if (!saved_domainname) | |
493 | return NULL; | |
494 | entry = kzalloc(sizeof(*entry), GFP_NOFS); | |
495 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) | |
496 | goto out; | |
497 | list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { | |
498 | if (domain->is_deleted || | |
499 | tomoyo_pathcmp(saved_domainname, domain->domainname)) | |
500 | continue; | |
501 | found = true; | |
502 | break; | |
503 | } | |
504 | if (!found && tomoyo_memory_ok(entry)) { | |
505 | INIT_LIST_HEAD(&entry->acl_info_list); | |
506 | entry->domainname = saved_domainname; | |
507 | saved_domainname = NULL; | |
508 | entry->profile = profile; | |
509 | list_add_tail_rcu(&entry->list, &tomoyo_domain_list); | |
510 | domain = entry; | |
511 | entry = NULL; | |
512 | found = true; | |
513 | } | |
514 | mutex_unlock(&tomoyo_policy_lock); | |
515 | out: | |
516 | tomoyo_put_name(saved_domainname); | |
517 | kfree(entry); | |
518 | return found ? domain : NULL; | |
519 | } | |
520 | ||
521 | /** | |
522 | * tomoyo_find_next_domain - Find a domain. | |
523 | * | |
524 | * @bprm: Pointer to "struct linux_binprm". | |
525 | * | |
526 | * Returns 0 on success, negative value otherwise. | |
527 | * | |
528 | * Caller holds tomoyo_read_lock(). | |
529 | */ | |
530 | int tomoyo_find_next_domain(struct linux_binprm *bprm) | |
531 | { | |
532 | struct tomoyo_request_info r; | |
533 | char *tmp = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS); | |
534 | struct tomoyo_domain_info *old_domain = tomoyo_domain(); | |
535 | struct tomoyo_domain_info *domain = NULL; | |
536 | const char *old_domain_name = old_domain->domainname->name; | |
537 | const char *original_name = bprm->filename; | |
538 | u8 mode; | |
539 | bool is_enforce; | |
540 | int retval = -ENOMEM; | |
541 | bool need_kfree = false; | |
542 | struct tomoyo_path_info rn = { }; /* real name */ | |
543 | struct tomoyo_path_info ln; /* last name */ | |
544 | ||
545 | ln.name = tomoyo_get_last_name(old_domain); | |
546 | tomoyo_fill_path_info(&ln); | |
547 | mode = tomoyo_init_request_info(&r, NULL, TOMOYO_MAC_FILE_EXECUTE); | |
548 | is_enforce = (mode == TOMOYO_CONFIG_ENFORCING); | |
549 | if (!tmp) | |
550 | goto out; | |
551 | ||
552 | retry: | |
553 | if (need_kfree) { | |
554 | kfree(rn.name); | |
555 | need_kfree = false; | |
556 | } | |
557 | /* Get symlink's pathname of program. */ | |
558 | retval = -ENOENT; | |
559 | rn.name = tomoyo_realpath_nofollow(original_name); | |
560 | if (!rn.name) | |
561 | goto out; | |
562 | tomoyo_fill_path_info(&rn); | |
563 | need_kfree = true; | |
564 | ||
565 | /* Check 'aggregator' directive. */ | |
566 | { | |
567 | struct tomoyo_aggregator_entry *ptr; | |
568 | list_for_each_entry_rcu(ptr, &tomoyo_policy_list | |
569 | [TOMOYO_ID_AGGREGATOR], head.list) { | |
570 | if (ptr->head.is_deleted || | |
571 | !tomoyo_path_matches_pattern(&rn, | |
572 | ptr->original_name)) | |
573 | continue; | |
574 | kfree(rn.name); | |
575 | need_kfree = false; | |
576 | /* This is OK because it is read only. */ | |
577 | rn = *ptr->aggregated_name; | |
578 | break; | |
579 | } | |
580 | } | |
581 | ||
582 | /* Check execute permission. */ | |
583 | retval = tomoyo_path_permission(&r, TOMOYO_TYPE_EXECUTE, &rn); | |
584 | if (retval == TOMOYO_RETRY_REQUEST) | |
585 | goto retry; | |
586 | if (retval < 0) | |
587 | goto out; | |
588 | ||
589 | if (tomoyo_domain_initializer(old_domain->domainname, &rn, &ln)) { | |
590 | /* Transit to the child of tomoyo_kernel_domain domain. */ | |
591 | snprintf(tmp, TOMOYO_EXEC_TMPSIZE - 1, | |
592 | TOMOYO_ROOT_NAME " " "%s", rn.name); | |
593 | } else if (old_domain == &tomoyo_kernel_domain && | |
594 | !tomoyo_policy_loaded) { | |
595 | /* | |
596 | * Needn't to transit from kernel domain before starting | |
597 | * /sbin/init. But transit from kernel domain if executing | |
598 | * initializers because they might start before /sbin/init. | |
599 | */ | |
600 | domain = old_domain; | |
601 | } else if (tomoyo_domain_keeper(old_domain->domainname, &rn, &ln)) { | |
602 | /* Keep current domain. */ | |
603 | domain = old_domain; | |
604 | } else { | |
605 | /* Normal domain transition. */ | |
606 | snprintf(tmp, TOMOYO_EXEC_TMPSIZE - 1, | |
607 | "%s %s", old_domain_name, rn.name); | |
608 | } | |
609 | if (domain || strlen(tmp) >= TOMOYO_EXEC_TMPSIZE - 10) | |
610 | goto done; | |
611 | domain = tomoyo_find_domain(tmp); | |
612 | if (domain) | |
613 | goto done; | |
614 | if (is_enforce) { | |
615 | int error = tomoyo_supervisor(&r, "# wants to create domain\n" | |
616 | "%s\n", tmp); | |
617 | if (error == TOMOYO_RETRY_REQUEST) | |
618 | goto retry; | |
619 | if (error < 0) | |
620 | goto done; | |
621 | } | |
622 | domain = tomoyo_find_or_assign_new_domain(tmp, old_domain->profile); | |
623 | done: | |
624 | if (domain) | |
625 | goto out; | |
626 | printk(KERN_WARNING "TOMOYO-ERROR: Domain '%s' not defined.\n", tmp); | |
627 | if (is_enforce) | |
628 | retval = -EPERM; | |
629 | else | |
630 | old_domain->transition_failed = true; | |
631 | out: | |
632 | if (!domain) | |
633 | domain = old_domain; | |
634 | /* Update reference count on "struct tomoyo_domain_info". */ | |
635 | atomic_inc(&domain->users); | |
636 | bprm->cred->security = domain; | |
637 | if (need_kfree) | |
638 | kfree(rn.name); | |
639 | kfree(tmp); | |
640 | return retval; | |
641 | } |