perf/x86/intel: Fix PMU read for auto-reload
[linux/fpc-iii.git] / security / tomoyo / domain.c
blobf6758dad981f7f32d8897f4f2c790ea69a168db0
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * security/tomoyo/domain.c
5 * Copyright (C) 2005-2011 NTT DATA CORPORATION
6 */
8 #include "common.h"
10 #include <linux/binfmts.h>
11 #include <linux/slab.h>
12 #include <linux/rculist.h>
14 /* Variables definitions.*/
16 /* The initial domain. */
17 struct tomoyo_domain_info tomoyo_kernel_domain;
19 /**
20 * tomoyo_update_policy - Update an entry for exception policy.
22 * @new_entry: Pointer to "struct tomoyo_acl_info".
23 * @size: Size of @new_entry in bytes.
24 * @param: Pointer to "struct tomoyo_acl_param".
25 * @check_duplicate: Callback function to find duplicated entry.
27 * Returns 0 on success, negative value otherwise.
29 * Caller holds tomoyo_read_lock().
31 int tomoyo_update_policy(struct tomoyo_acl_head *new_entry, const int size,
32 struct tomoyo_acl_param *param,
33 bool (*check_duplicate) (const struct tomoyo_acl_head
35 const struct tomoyo_acl_head
36 *))
38 int error = param->is_delete ? -ENOENT : -ENOMEM;
39 struct tomoyo_acl_head *entry;
40 struct list_head *list = param->list;
42 if (mutex_lock_interruptible(&tomoyo_policy_lock))
43 return -ENOMEM;
44 list_for_each_entry_rcu(entry, list, list) {
45 if (entry->is_deleted == TOMOYO_GC_IN_PROGRESS)
46 continue;
47 if (!check_duplicate(entry, new_entry))
48 continue;
49 entry->is_deleted = param->is_delete;
50 error = 0;
51 break;
53 if (error && !param->is_delete) {
54 entry = tomoyo_commit_ok(new_entry, size);
55 if (entry) {
56 list_add_tail_rcu(&entry->list, list);
57 error = 0;
60 mutex_unlock(&tomoyo_policy_lock);
61 return error;
64 /**
65 * tomoyo_same_acl_head - Check for duplicated "struct tomoyo_acl_info" entry.
67 * @a: Pointer to "struct tomoyo_acl_info".
68 * @b: Pointer to "struct tomoyo_acl_info".
70 * Returns true if @a == @b, false otherwise.
72 static inline bool tomoyo_same_acl_head(const struct tomoyo_acl_info *a,
73 const struct tomoyo_acl_info *b)
75 return a->type == b->type && a->cond == b->cond;
78 /**
79 * tomoyo_update_domain - Update an entry for domain policy.
81 * @new_entry: Pointer to "struct tomoyo_acl_info".
82 * @size: Size of @new_entry in bytes.
83 * @param: Pointer to "struct tomoyo_acl_param".
84 * @check_duplicate: Callback function to find duplicated entry.
85 * @merge_duplicate: Callback function to merge duplicated entry.
87 * Returns 0 on success, negative value otherwise.
89 * Caller holds tomoyo_read_lock().
91 int tomoyo_update_domain(struct tomoyo_acl_info *new_entry, const int size,
92 struct tomoyo_acl_param *param,
93 bool (*check_duplicate) (const struct tomoyo_acl_info
95 const struct tomoyo_acl_info
96 *),
97 bool (*merge_duplicate) (struct tomoyo_acl_info *,
98 struct tomoyo_acl_info *,
99 const bool))
101 const bool is_delete = param->is_delete;
102 int error = is_delete ? -ENOENT : -ENOMEM;
103 struct tomoyo_acl_info *entry;
104 struct list_head * const list = param->list;
106 if (param->data[0]) {
107 new_entry->cond = tomoyo_get_condition(param);
108 if (!new_entry->cond)
109 return -EINVAL;
111 * Domain transition preference is allowed for only
112 * "file execute" entries.
114 if (new_entry->cond->transit &&
115 !(new_entry->type == TOMOYO_TYPE_PATH_ACL &&
116 container_of(new_entry, struct tomoyo_path_acl, head)
117 ->perm == 1 << TOMOYO_TYPE_EXECUTE))
118 goto out;
120 if (mutex_lock_interruptible(&tomoyo_policy_lock))
121 goto out;
122 list_for_each_entry_rcu(entry, list, list) {
123 if (entry->is_deleted == TOMOYO_GC_IN_PROGRESS)
124 continue;
125 if (!tomoyo_same_acl_head(entry, new_entry) ||
126 !check_duplicate(entry, new_entry))
127 continue;
128 if (merge_duplicate)
129 entry->is_deleted = merge_duplicate(entry, new_entry,
130 is_delete);
131 else
132 entry->is_deleted = is_delete;
133 error = 0;
134 break;
136 if (error && !is_delete) {
137 entry = tomoyo_commit_ok(new_entry, size);
138 if (entry) {
139 list_add_tail_rcu(&entry->list, list);
140 error = 0;
143 mutex_unlock(&tomoyo_policy_lock);
144 out:
145 tomoyo_put_condition(new_entry->cond);
146 return error;
150 * tomoyo_check_acl - Do permission check.
152 * @r: Pointer to "struct tomoyo_request_info".
153 * @check_entry: Callback function to check type specific parameters.
155 * Returns 0 on success, negative value otherwise.
157 * Caller holds tomoyo_read_lock().
159 void tomoyo_check_acl(struct tomoyo_request_info *r,
160 bool (*check_entry) (struct tomoyo_request_info *,
161 const struct tomoyo_acl_info *))
163 const struct tomoyo_domain_info *domain = r->domain;
164 struct tomoyo_acl_info *ptr;
165 bool retried = false;
166 const struct list_head *list = &domain->acl_info_list;
168 retry:
169 list_for_each_entry_rcu(ptr, list, list) {
170 if (ptr->is_deleted || ptr->type != r->param_type)
171 continue;
172 if (!check_entry(r, ptr))
173 continue;
174 if (!tomoyo_condition(r, ptr->cond))
175 continue;
176 r->matched_acl = ptr;
177 r->granted = true;
178 return;
180 if (!retried) {
181 retried = true;
182 list = &domain->ns->acl_group[domain->group];
183 goto retry;
185 r->granted = false;
188 /* The list for "struct tomoyo_domain_info". */
189 LIST_HEAD(tomoyo_domain_list);
192 * tomoyo_last_word - Get last component of a domainname.
194 * @name: Domainname to check.
196 * Returns the last word of @domainname.
198 static const char *tomoyo_last_word(const char *name)
200 const char *cp = strrchr(name, ' ');
201 if (cp)
202 return cp + 1;
203 return name;
207 * tomoyo_same_transition_control - Check for duplicated "struct tomoyo_transition_control" entry.
209 * @a: Pointer to "struct tomoyo_acl_head".
210 * @b: Pointer to "struct tomoyo_acl_head".
212 * Returns true if @a == @b, false otherwise.
214 static bool tomoyo_same_transition_control(const struct tomoyo_acl_head *a,
215 const struct tomoyo_acl_head *b)
217 const struct tomoyo_transition_control *p1 = container_of(a,
218 typeof(*p1),
219 head);
220 const struct tomoyo_transition_control *p2 = container_of(b,
221 typeof(*p2),
222 head);
223 return p1->type == p2->type && p1->is_last_name == p2->is_last_name
224 && p1->domainname == p2->domainname
225 && p1->program == p2->program;
229 * tomoyo_write_transition_control - Write "struct tomoyo_transition_control" list.
231 * @param: Pointer to "struct tomoyo_acl_param".
232 * @type: Type of this entry.
234 * Returns 0 on success, negative value otherwise.
236 int tomoyo_write_transition_control(struct tomoyo_acl_param *param,
237 const u8 type)
239 struct tomoyo_transition_control e = { .type = type };
240 int error = param->is_delete ? -ENOENT : -ENOMEM;
241 char *program = param->data;
242 char *domainname = strstr(program, " from ");
243 if (domainname) {
244 *domainname = '\0';
245 domainname += 6;
246 } else if (type == TOMOYO_TRANSITION_CONTROL_NO_KEEP ||
247 type == TOMOYO_TRANSITION_CONTROL_KEEP) {
248 domainname = program;
249 program = NULL;
251 if (program && strcmp(program, "any")) {
252 if (!tomoyo_correct_path(program))
253 return -EINVAL;
254 e.program = tomoyo_get_name(program);
255 if (!e.program)
256 goto out;
258 if (domainname && strcmp(domainname, "any")) {
259 if (!tomoyo_correct_domain(domainname)) {
260 if (!tomoyo_correct_path(domainname))
261 goto out;
262 e.is_last_name = true;
264 e.domainname = tomoyo_get_name(domainname);
265 if (!e.domainname)
266 goto out;
268 param->list = &param->ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL];
269 error = tomoyo_update_policy(&e.head, sizeof(e), param,
270 tomoyo_same_transition_control);
271 out:
272 tomoyo_put_name(e.domainname);
273 tomoyo_put_name(e.program);
274 return error;
278 * tomoyo_scan_transition - Try to find specific domain transition type.
280 * @list: Pointer to "struct list_head".
281 * @domainname: The name of current domain.
282 * @program: The name of requested program.
283 * @last_name: The last component of @domainname.
284 * @type: One of values in "enum tomoyo_transition_type".
286 * Returns true if found one, false otherwise.
288 * Caller holds tomoyo_read_lock().
290 static inline bool tomoyo_scan_transition
291 (const struct list_head *list, const struct tomoyo_path_info *domainname,
292 const struct tomoyo_path_info *program, const char *last_name,
293 const enum tomoyo_transition_type type)
295 const struct tomoyo_transition_control *ptr;
296 list_for_each_entry_rcu(ptr, list, head.list) {
297 if (ptr->head.is_deleted || ptr->type != type)
298 continue;
299 if (ptr->domainname) {
300 if (!ptr->is_last_name) {
301 if (ptr->domainname != domainname)
302 continue;
303 } else {
305 * Use direct strcmp() since this is
306 * unlikely used.
308 if (strcmp(ptr->domainname->name, last_name))
309 continue;
312 if (ptr->program && tomoyo_pathcmp(ptr->program, program))
313 continue;
314 return true;
316 return false;
320 * tomoyo_transition_type - Get domain transition type.
322 * @ns: Pointer to "struct tomoyo_policy_namespace".
323 * @domainname: The name of current domain.
324 * @program: The name of requested program.
326 * Returns TOMOYO_TRANSITION_CONTROL_TRANSIT if executing @program causes
327 * domain transition across namespaces, TOMOYO_TRANSITION_CONTROL_INITIALIZE if
328 * executing @program reinitializes domain transition within that namespace,
329 * TOMOYO_TRANSITION_CONTROL_KEEP if executing @program stays at @domainname ,
330 * others otherwise.
332 * Caller holds tomoyo_read_lock().
334 static enum tomoyo_transition_type tomoyo_transition_type
335 (const struct tomoyo_policy_namespace *ns,
336 const struct tomoyo_path_info *domainname,
337 const struct tomoyo_path_info *program)
339 const char *last_name = tomoyo_last_word(domainname->name);
340 enum tomoyo_transition_type type = TOMOYO_TRANSITION_CONTROL_NO_RESET;
341 while (type < TOMOYO_MAX_TRANSITION_TYPE) {
342 const struct list_head * const list =
343 &ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL];
344 if (!tomoyo_scan_transition(list, domainname, program,
345 last_name, type)) {
346 type++;
347 continue;
349 if (type != TOMOYO_TRANSITION_CONTROL_NO_RESET &&
350 type != TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE)
351 break;
353 * Do not check for reset_domain if no_reset_domain matched.
354 * Do not check for initialize_domain if no_initialize_domain
355 * matched.
357 type++;
358 type++;
360 return type;
364 * tomoyo_same_aggregator - Check for duplicated "struct tomoyo_aggregator" entry.
366 * @a: Pointer to "struct tomoyo_acl_head".
367 * @b: Pointer to "struct tomoyo_acl_head".
369 * Returns true if @a == @b, false otherwise.
371 static bool tomoyo_same_aggregator(const struct tomoyo_acl_head *a,
372 const struct tomoyo_acl_head *b)
374 const struct tomoyo_aggregator *p1 = container_of(a, typeof(*p1),
375 head);
376 const struct tomoyo_aggregator *p2 = container_of(b, typeof(*p2),
377 head);
378 return p1->original_name == p2->original_name &&
379 p1->aggregated_name == p2->aggregated_name;
383 * tomoyo_write_aggregator - Write "struct tomoyo_aggregator" list.
385 * @param: Pointer to "struct tomoyo_acl_param".
387 * Returns 0 on success, negative value otherwise.
389 * Caller holds tomoyo_read_lock().
391 int tomoyo_write_aggregator(struct tomoyo_acl_param *param)
393 struct tomoyo_aggregator e = { };
394 int error = param->is_delete ? -ENOENT : -ENOMEM;
395 const char *original_name = tomoyo_read_token(param);
396 const char *aggregated_name = tomoyo_read_token(param);
397 if (!tomoyo_correct_word(original_name) ||
398 !tomoyo_correct_path(aggregated_name))
399 return -EINVAL;
400 e.original_name = tomoyo_get_name(original_name);
401 e.aggregated_name = tomoyo_get_name(aggregated_name);
402 if (!e.original_name || !e.aggregated_name ||
403 e.aggregated_name->is_patterned) /* No patterns allowed. */
404 goto out;
405 param->list = &param->ns->policy_list[TOMOYO_ID_AGGREGATOR];
406 error = tomoyo_update_policy(&e.head, sizeof(e), param,
407 tomoyo_same_aggregator);
408 out:
409 tomoyo_put_name(e.original_name);
410 tomoyo_put_name(e.aggregated_name);
411 return error;
415 * tomoyo_find_namespace - Find specified namespace.
417 * @name: Name of namespace to find.
418 * @len: Length of @name.
420 * Returns pointer to "struct tomoyo_policy_namespace" if found,
421 * NULL otherwise.
423 * Caller holds tomoyo_read_lock().
425 static struct tomoyo_policy_namespace *tomoyo_find_namespace
426 (const char *name, const unsigned int len)
428 struct tomoyo_policy_namespace *ns;
429 list_for_each_entry(ns, &tomoyo_namespace_list, namespace_list) {
430 if (strncmp(name, ns->name, len) ||
431 (name[len] && name[len] != ' '))
432 continue;
433 return ns;
435 return NULL;
439 * tomoyo_assign_namespace - Create a new namespace.
441 * @domainname: Name of namespace to create.
443 * Returns pointer to "struct tomoyo_policy_namespace" on success,
444 * NULL otherwise.
446 * Caller holds tomoyo_read_lock().
448 struct tomoyo_policy_namespace *tomoyo_assign_namespace(const char *domainname)
450 struct tomoyo_policy_namespace *ptr;
451 struct tomoyo_policy_namespace *entry;
452 const char *cp = domainname;
453 unsigned int len = 0;
454 while (*cp && *cp++ != ' ')
455 len++;
456 ptr = tomoyo_find_namespace(domainname, len);
457 if (ptr)
458 return ptr;
459 if (len >= TOMOYO_EXEC_TMPSIZE - 10 || !tomoyo_domain_def(domainname))
460 return NULL;
461 entry = kzalloc(sizeof(*entry) + len + 1, GFP_NOFS);
462 if (!entry)
463 return NULL;
464 if (mutex_lock_interruptible(&tomoyo_policy_lock))
465 goto out;
466 ptr = tomoyo_find_namespace(domainname, len);
467 if (!ptr && tomoyo_memory_ok(entry)) {
468 char *name = (char *) (entry + 1);
469 ptr = entry;
470 memmove(name, domainname, len);
471 name[len] = '\0';
472 entry->name = name;
473 tomoyo_init_policy_namespace(entry);
474 entry = NULL;
476 mutex_unlock(&tomoyo_policy_lock);
477 out:
478 kfree(entry);
479 return ptr;
483 * tomoyo_namespace_jump - Check for namespace jump.
485 * @domainname: Name of domain.
487 * Returns true if namespace differs, false otherwise.
489 static bool tomoyo_namespace_jump(const char *domainname)
491 const char *namespace = tomoyo_current_namespace()->name;
492 const int len = strlen(namespace);
493 return strncmp(domainname, namespace, len) ||
494 (domainname[len] && domainname[len] != ' ');
498 * tomoyo_assign_domain - Create a domain or a namespace.
500 * @domainname: The name of domain.
501 * @transit: True if transit to domain found or created.
503 * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise.
505 * Caller holds tomoyo_read_lock().
507 struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname,
508 const bool transit)
510 struct tomoyo_domain_info e = { };
511 struct tomoyo_domain_info *entry = tomoyo_find_domain(domainname);
512 bool created = false;
513 if (entry) {
514 if (transit) {
516 * Since namespace is created at runtime, profiles may
517 * not be created by the moment the process transits to
518 * that domain. Do not perform domain transition if
519 * profile for that domain is not yet created.
521 if (tomoyo_policy_loaded &&
522 !entry->ns->profile_ptr[entry->profile])
523 return NULL;
525 return entry;
527 /* Requested domain does not exist. */
528 /* Don't create requested domain if domainname is invalid. */
529 if (strlen(domainname) >= TOMOYO_EXEC_TMPSIZE - 10 ||
530 !tomoyo_correct_domain(domainname))
531 return NULL;
533 * Since definition of profiles and acl_groups may differ across
534 * namespaces, do not inherit "use_profile" and "use_group" settings
535 * by automatically creating requested domain upon domain transition.
537 if (transit && tomoyo_namespace_jump(domainname))
538 return NULL;
539 e.ns = tomoyo_assign_namespace(domainname);
540 if (!e.ns)
541 return NULL;
543 * "use_profile" and "use_group" settings for automatically created
544 * domains are inherited from current domain. These are 0 for manually
545 * created domains.
547 if (transit) {
548 const struct tomoyo_domain_info *domain = tomoyo_domain();
549 e.profile = domain->profile;
550 e.group = domain->group;
552 e.domainname = tomoyo_get_name(domainname);
553 if (!e.domainname)
554 return NULL;
555 if (mutex_lock_interruptible(&tomoyo_policy_lock))
556 goto out;
557 entry = tomoyo_find_domain(domainname);
558 if (!entry) {
559 entry = tomoyo_commit_ok(&e, sizeof(e));
560 if (entry) {
561 INIT_LIST_HEAD(&entry->acl_info_list);
562 list_add_tail_rcu(&entry->list, &tomoyo_domain_list);
563 created = true;
566 mutex_unlock(&tomoyo_policy_lock);
567 out:
568 tomoyo_put_name(e.domainname);
569 if (entry && transit) {
570 if (created) {
571 struct tomoyo_request_info r;
572 tomoyo_init_request_info(&r, entry,
573 TOMOYO_MAC_FILE_EXECUTE);
574 r.granted = false;
575 tomoyo_write_log(&r, "use_profile %u\n",
576 entry->profile);
577 tomoyo_write_log(&r, "use_group %u\n", entry->group);
578 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
581 return entry;
585 * tomoyo_environ - Check permission for environment variable names.
587 * @ee: Pointer to "struct tomoyo_execve".
589 * Returns 0 on success, negative value otherwise.
591 static int tomoyo_environ(struct tomoyo_execve *ee)
593 struct tomoyo_request_info *r = &ee->r;
594 struct linux_binprm *bprm = ee->bprm;
595 /* env_page.data is allocated by tomoyo_dump_page(). */
596 struct tomoyo_page_dump env_page = { };
597 char *arg_ptr; /* Size is TOMOYO_EXEC_TMPSIZE bytes */
598 int arg_len = 0;
599 unsigned long pos = bprm->p;
600 int offset = pos % PAGE_SIZE;
601 int argv_count = bprm->argc;
602 int envp_count = bprm->envc;
603 int error = -ENOMEM;
605 ee->r.type = TOMOYO_MAC_ENVIRON;
606 ee->r.profile = r->domain->profile;
607 ee->r.mode = tomoyo_get_mode(r->domain->ns, ee->r.profile,
608 TOMOYO_MAC_ENVIRON);
609 if (!r->mode || !envp_count)
610 return 0;
611 arg_ptr = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS);
612 if (!arg_ptr)
613 goto out;
614 while (error == -ENOMEM) {
615 if (!tomoyo_dump_page(bprm, pos, &env_page))
616 goto out;
617 pos += PAGE_SIZE - offset;
618 /* Read. */
619 while (argv_count && offset < PAGE_SIZE) {
620 if (!env_page.data[offset++])
621 argv_count--;
623 if (argv_count) {
624 offset = 0;
625 continue;
627 while (offset < PAGE_SIZE) {
628 const unsigned char c = env_page.data[offset++];
630 if (c && arg_len < TOMOYO_EXEC_TMPSIZE - 10) {
631 if (c == '=') {
632 arg_ptr[arg_len++] = '\0';
633 } else if (c == '\\') {
634 arg_ptr[arg_len++] = '\\';
635 arg_ptr[arg_len++] = '\\';
636 } else if (c > ' ' && c < 127) {
637 arg_ptr[arg_len++] = c;
638 } else {
639 arg_ptr[arg_len++] = '\\';
640 arg_ptr[arg_len++] = (c >> 6) + '0';
641 arg_ptr[arg_len++]
642 = ((c >> 3) & 7) + '0';
643 arg_ptr[arg_len++] = (c & 7) + '0';
645 } else {
646 arg_ptr[arg_len] = '\0';
648 if (c)
649 continue;
650 if (tomoyo_env_perm(r, arg_ptr)) {
651 error = -EPERM;
652 break;
654 if (!--envp_count) {
655 error = 0;
656 break;
658 arg_len = 0;
660 offset = 0;
662 out:
663 if (r->mode != TOMOYO_CONFIG_ENFORCING)
664 error = 0;
665 kfree(env_page.data);
666 kfree(arg_ptr);
667 return error;
671 * tomoyo_find_next_domain - Find a domain.
673 * @bprm: Pointer to "struct linux_binprm".
675 * Returns 0 on success, negative value otherwise.
677 * Caller holds tomoyo_read_lock().
679 int tomoyo_find_next_domain(struct linux_binprm *bprm)
681 struct tomoyo_domain_info *old_domain = tomoyo_domain();
682 struct tomoyo_domain_info *domain = NULL;
683 const char *original_name = bprm->filename;
684 int retval = -ENOMEM;
685 bool reject_on_transition_failure = false;
686 const struct tomoyo_path_info *candidate;
687 struct tomoyo_path_info exename;
688 struct tomoyo_execve *ee = kzalloc(sizeof(*ee), GFP_NOFS);
690 if (!ee)
691 return -ENOMEM;
692 ee->tmp = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS);
693 if (!ee->tmp) {
694 kfree(ee);
695 return -ENOMEM;
697 /* ee->dump->data is allocated by tomoyo_dump_page(). */
698 tomoyo_init_request_info(&ee->r, NULL, TOMOYO_MAC_FILE_EXECUTE);
699 ee->r.ee = ee;
700 ee->bprm = bprm;
701 ee->r.obj = &ee->obj;
702 ee->obj.path1 = bprm->file->f_path;
703 /* Get symlink's pathname of program. */
704 retval = -ENOENT;
705 exename.name = tomoyo_realpath_nofollow(original_name);
706 if (!exename.name)
707 goto out;
708 tomoyo_fill_path_info(&exename);
709 retry:
710 /* Check 'aggregator' directive. */
712 struct tomoyo_aggregator *ptr;
713 struct list_head *list =
714 &old_domain->ns->policy_list[TOMOYO_ID_AGGREGATOR];
715 /* Check 'aggregator' directive. */
716 candidate = &exename;
717 list_for_each_entry_rcu(ptr, list, head.list) {
718 if (ptr->head.is_deleted ||
719 !tomoyo_path_matches_pattern(&exename,
720 ptr->original_name))
721 continue;
722 candidate = ptr->aggregated_name;
723 break;
727 /* Check execute permission. */
728 retval = tomoyo_execute_permission(&ee->r, candidate);
729 if (retval == TOMOYO_RETRY_REQUEST)
730 goto retry;
731 if (retval < 0)
732 goto out;
734 * To be able to specify domainnames with wildcards, use the
735 * pathname specified in the policy (which may contain
736 * wildcard) rather than the pathname passed to execve()
737 * (which never contains wildcard).
739 if (ee->r.param.path.matched_path)
740 candidate = ee->r.param.path.matched_path;
743 * Check for domain transition preference if "file execute" matched.
744 * If preference is given, make do_execve() fail if domain transition
745 * has failed, for domain transition preference should be used with
746 * destination domain defined.
748 if (ee->transition) {
749 const char *domainname = ee->transition->name;
750 reject_on_transition_failure = true;
751 if (!strcmp(domainname, "keep"))
752 goto force_keep_domain;
753 if (!strcmp(domainname, "child"))
754 goto force_child_domain;
755 if (!strcmp(domainname, "reset"))
756 goto force_reset_domain;
757 if (!strcmp(domainname, "initialize"))
758 goto force_initialize_domain;
759 if (!strcmp(domainname, "parent")) {
760 char *cp;
761 strncpy(ee->tmp, old_domain->domainname->name,
762 TOMOYO_EXEC_TMPSIZE - 1);
763 cp = strrchr(ee->tmp, ' ');
764 if (cp)
765 *cp = '\0';
766 } else if (*domainname == '<')
767 strncpy(ee->tmp, domainname, TOMOYO_EXEC_TMPSIZE - 1);
768 else
769 snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
770 old_domain->domainname->name, domainname);
771 goto force_jump_domain;
774 * No domain transition preference specified.
775 * Calculate domain to transit to.
777 switch (tomoyo_transition_type(old_domain->ns, old_domain->domainname,
778 candidate)) {
779 case TOMOYO_TRANSITION_CONTROL_RESET:
780 force_reset_domain:
781 /* Transit to the root of specified namespace. */
782 snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "<%s>",
783 candidate->name);
785 * Make do_execve() fail if domain transition across namespaces
786 * has failed.
788 reject_on_transition_failure = true;
789 break;
790 case TOMOYO_TRANSITION_CONTROL_INITIALIZE:
791 force_initialize_domain:
792 /* Transit to the child of current namespace's root. */
793 snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
794 old_domain->ns->name, candidate->name);
795 break;
796 case TOMOYO_TRANSITION_CONTROL_KEEP:
797 force_keep_domain:
798 /* Keep current domain. */
799 domain = old_domain;
800 break;
801 default:
802 if (old_domain == &tomoyo_kernel_domain &&
803 !tomoyo_policy_loaded) {
805 * Needn't to transit from kernel domain before
806 * starting /sbin/init. But transit from kernel domain
807 * if executing initializers because they might start
808 * before /sbin/init.
810 domain = old_domain;
811 break;
813 force_child_domain:
814 /* Normal domain transition. */
815 snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
816 old_domain->domainname->name, candidate->name);
817 break;
819 force_jump_domain:
820 if (!domain)
821 domain = tomoyo_assign_domain(ee->tmp, true);
822 if (domain)
823 retval = 0;
824 else if (reject_on_transition_failure) {
825 printk(KERN_WARNING "ERROR: Domain '%s' not ready.\n",
826 ee->tmp);
827 retval = -ENOMEM;
828 } else if (ee->r.mode == TOMOYO_CONFIG_ENFORCING)
829 retval = -ENOMEM;
830 else {
831 retval = 0;
832 if (!old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED]) {
833 old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED] = true;
834 ee->r.granted = false;
835 tomoyo_write_log(&ee->r, "%s", tomoyo_dif
836 [TOMOYO_DIF_TRANSITION_FAILED]);
837 printk(KERN_WARNING
838 "ERROR: Domain '%s' not defined.\n", ee->tmp);
841 out:
842 if (!domain)
843 domain = old_domain;
844 /* Update reference count on "struct tomoyo_domain_info". */
845 atomic_inc(&domain->users);
846 bprm->cred->security = domain;
847 kfree(exename.name);
848 if (!retval) {
849 ee->r.domain = domain;
850 retval = tomoyo_environ(ee);
852 kfree(ee->tmp);
853 kfree(ee->dump.data);
854 kfree(ee);
855 return retval;
859 * tomoyo_dump_page - Dump a page to buffer.
861 * @bprm: Pointer to "struct linux_binprm".
862 * @pos: Location to dump.
863 * @dump: Poiner to "struct tomoyo_page_dump".
865 * Returns true on success, false otherwise.
867 bool tomoyo_dump_page(struct linux_binprm *bprm, unsigned long pos,
868 struct tomoyo_page_dump *dump)
870 struct page *page;
872 /* dump->data is released by tomoyo_find_next_domain(). */
873 if (!dump->data) {
874 dump->data = kzalloc(PAGE_SIZE, GFP_NOFS);
875 if (!dump->data)
876 return false;
878 /* Same with get_arg_page(bprm, pos, 0) in fs/exec.c */
879 #ifdef CONFIG_MMU
881 * This is called at execve() time in order to dig around
882 * in the argv/environment of the new proceess
883 * (represented by bprm). 'current' is the process doing
884 * the execve().
886 if (get_user_pages_remote(current, bprm->mm, pos, 1,
887 FOLL_FORCE, &page, NULL, NULL) <= 0)
888 return false;
889 #else
890 page = bprm->page[pos / PAGE_SIZE];
891 #endif
892 if (page != dump->page) {
893 const unsigned int offset = pos % PAGE_SIZE;
895 * Maybe kmap()/kunmap() should be used here.
896 * But remove_arg_zero() uses kmap_atomic()/kunmap_atomic().
897 * So do I.
899 char *kaddr = kmap_atomic(page);
901 dump->page = page;
902 memcpy(dump->data + offset, kaddr + offset,
903 PAGE_SIZE - offset);
904 kunmap_atomic(kaddr);
906 /* Same with put_arg_page(page) in fs/exec.c */
907 #ifdef CONFIG_MMU
908 put_page(page);
909 #endif
910 return true;