1 // SPDX-License-Identifier: GPL-2.0
3 * security/tomoyo/domain.c
5 * Copyright (C) 2005-2011 NTT DATA CORPORATION
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;
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
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))
44 list_for_each_entry_rcu(entry, list, list) {
45 if (entry->is_deleted == TOMOYO_GC_IN_PROGRESS)
47 if (!check_duplicate(entry, new_entry))
49 entry->is_deleted = param->is_delete;
53 if (error && !param->is_delete) {
54 entry = tomoyo_commit_ok(new_entry, size);
56 list_add_tail_rcu(&entry->list, list);
60 mutex_unlock(&tomoyo_policy_lock);
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;
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
97 bool (*merge_duplicate)(struct tomoyo_acl_info *,
98 struct tomoyo_acl_info *,
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)
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))
120 if (mutex_lock_interruptible(&tomoyo_policy_lock))
122 list_for_each_entry_rcu(entry, list, list) {
123 if (entry->is_deleted == TOMOYO_GC_IN_PROGRESS)
125 if (!tomoyo_same_acl_head(entry, new_entry) ||
126 !check_duplicate(entry, new_entry))
129 entry->is_deleted = merge_duplicate(entry, new_entry,
132 entry->is_deleted = is_delete;
136 if (error && !is_delete) {
137 entry = tomoyo_commit_ok(new_entry, size);
139 list_add_tail_rcu(&entry->list, list);
143 mutex_unlock(&tomoyo_policy_lock);
145 tomoyo_put_condition(new_entry->cond);
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 const struct list_head *list = &domain->acl_info_list;
169 list_for_each_entry_rcu(ptr, list, list) {
170 if (ptr->is_deleted || ptr->type != r->param_type)
172 if (!check_entry(r, ptr))
174 if (!tomoyo_condition(r, ptr->cond))
176 r->matched_acl = ptr;
180 for (; i < TOMOYO_MAX_ACL_GROUPS; i++) {
181 if (!test_bit(i, domain->group))
183 list = &domain->ns->acl_group[i++];
189 /* The list for "struct tomoyo_domain_info". */
190 LIST_HEAD(tomoyo_domain_list);
193 * tomoyo_last_word - Get last component of a domainname.
195 * @name: Domainname to check.
197 * Returns the last word of @domainname.
199 static const char *tomoyo_last_word(const char *name)
201 const char *cp = strrchr(name, ' ');
209 * tomoyo_same_transition_control - Check for duplicated "struct tomoyo_transition_control" entry.
211 * @a: Pointer to "struct tomoyo_acl_head".
212 * @b: Pointer to "struct tomoyo_acl_head".
214 * Returns true if @a == @b, false otherwise.
216 static bool tomoyo_same_transition_control(const struct tomoyo_acl_head *a,
217 const struct tomoyo_acl_head *b)
219 const struct tomoyo_transition_control *p1 = container_of(a,
222 const struct tomoyo_transition_control *p2 = container_of(b,
226 return p1->type == p2->type && p1->is_last_name == p2->is_last_name
227 && p1->domainname == p2->domainname
228 && p1->program == p2->program;
232 * tomoyo_write_transition_control - Write "struct tomoyo_transition_control" list.
234 * @param: Pointer to "struct tomoyo_acl_param".
235 * @type: Type of this entry.
237 * Returns 0 on success, negative value otherwise.
239 int tomoyo_write_transition_control(struct tomoyo_acl_param *param,
242 struct tomoyo_transition_control e = { .type = type };
243 int error = param->is_delete ? -ENOENT : -ENOMEM;
244 char *program = param->data;
245 char *domainname = strstr(program, " from ");
250 } else if (type == TOMOYO_TRANSITION_CONTROL_NO_KEEP ||
251 type == TOMOYO_TRANSITION_CONTROL_KEEP) {
252 domainname = program;
255 if (program && strcmp(program, "any")) {
256 if (!tomoyo_correct_path(program))
258 e.program = tomoyo_get_name(program);
262 if (domainname && strcmp(domainname, "any")) {
263 if (!tomoyo_correct_domain(domainname)) {
264 if (!tomoyo_correct_path(domainname))
266 e.is_last_name = true;
268 e.domainname = tomoyo_get_name(domainname);
272 param->list = ¶m->ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL];
273 error = tomoyo_update_policy(&e.head, sizeof(e), param,
274 tomoyo_same_transition_control);
276 tomoyo_put_name(e.domainname);
277 tomoyo_put_name(e.program);
282 * tomoyo_scan_transition - Try to find specific domain transition type.
284 * @list: Pointer to "struct list_head".
285 * @domainname: The name of current domain.
286 * @program: The name of requested program.
287 * @last_name: The last component of @domainname.
288 * @type: One of values in "enum tomoyo_transition_type".
290 * Returns true if found one, false otherwise.
292 * Caller holds tomoyo_read_lock().
294 static inline bool tomoyo_scan_transition
295 (const struct list_head *list, const struct tomoyo_path_info *domainname,
296 const struct tomoyo_path_info *program, const char *last_name,
297 const enum tomoyo_transition_type type)
299 const struct tomoyo_transition_control *ptr;
301 list_for_each_entry_rcu(ptr, list, head.list) {
302 if (ptr->head.is_deleted || ptr->type != type)
304 if (ptr->domainname) {
305 if (!ptr->is_last_name) {
306 if (ptr->domainname != domainname)
310 * Use direct strcmp() since this is
313 if (strcmp(ptr->domainname->name, last_name))
317 if (ptr->program && tomoyo_pathcmp(ptr->program, program))
325 * tomoyo_transition_type - Get domain transition type.
327 * @ns: Pointer to "struct tomoyo_policy_namespace".
328 * @domainname: The name of current domain.
329 * @program: The name of requested program.
331 * Returns TOMOYO_TRANSITION_CONTROL_TRANSIT if executing @program causes
332 * domain transition across namespaces, TOMOYO_TRANSITION_CONTROL_INITIALIZE if
333 * executing @program reinitializes domain transition within that namespace,
334 * TOMOYO_TRANSITION_CONTROL_KEEP if executing @program stays at @domainname ,
337 * Caller holds tomoyo_read_lock().
339 static enum tomoyo_transition_type tomoyo_transition_type
340 (const struct tomoyo_policy_namespace *ns,
341 const struct tomoyo_path_info *domainname,
342 const struct tomoyo_path_info *program)
344 const char *last_name = tomoyo_last_word(domainname->name);
345 enum tomoyo_transition_type type = TOMOYO_TRANSITION_CONTROL_NO_RESET;
347 while (type < TOMOYO_MAX_TRANSITION_TYPE) {
348 const struct list_head * const list =
349 &ns->policy_list[TOMOYO_ID_TRANSITION_CONTROL];
351 if (!tomoyo_scan_transition(list, domainname, program,
356 if (type != TOMOYO_TRANSITION_CONTROL_NO_RESET &&
357 type != TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE)
360 * Do not check for reset_domain if no_reset_domain matched.
361 * Do not check for initialize_domain if no_initialize_domain
371 * tomoyo_same_aggregator - Check for duplicated "struct tomoyo_aggregator" entry.
373 * @a: Pointer to "struct tomoyo_acl_head".
374 * @b: Pointer to "struct tomoyo_acl_head".
376 * Returns true if @a == @b, false otherwise.
378 static bool tomoyo_same_aggregator(const struct tomoyo_acl_head *a,
379 const struct tomoyo_acl_head *b)
381 const struct tomoyo_aggregator *p1 = container_of(a, typeof(*p1),
383 const struct tomoyo_aggregator *p2 = container_of(b, typeof(*p2),
386 return p1->original_name == p2->original_name &&
387 p1->aggregated_name == p2->aggregated_name;
391 * tomoyo_write_aggregator - Write "struct tomoyo_aggregator" list.
393 * @param: Pointer to "struct tomoyo_acl_param".
395 * Returns 0 on success, negative value otherwise.
397 * Caller holds tomoyo_read_lock().
399 int tomoyo_write_aggregator(struct tomoyo_acl_param *param)
401 struct tomoyo_aggregator e = { };
402 int error = param->is_delete ? -ENOENT : -ENOMEM;
403 const char *original_name = tomoyo_read_token(param);
404 const char *aggregated_name = tomoyo_read_token(param);
406 if (!tomoyo_correct_word(original_name) ||
407 !tomoyo_correct_path(aggregated_name))
409 e.original_name = tomoyo_get_name(original_name);
410 e.aggregated_name = tomoyo_get_name(aggregated_name);
411 if (!e.original_name || !e.aggregated_name ||
412 e.aggregated_name->is_patterned) /* No patterns allowed. */
414 param->list = ¶m->ns->policy_list[TOMOYO_ID_AGGREGATOR];
415 error = tomoyo_update_policy(&e.head, sizeof(e), param,
416 tomoyo_same_aggregator);
418 tomoyo_put_name(e.original_name);
419 tomoyo_put_name(e.aggregated_name);
424 * tomoyo_find_namespace - Find specified namespace.
426 * @name: Name of namespace to find.
427 * @len: Length of @name.
429 * Returns pointer to "struct tomoyo_policy_namespace" if found,
432 * Caller holds tomoyo_read_lock().
434 static struct tomoyo_policy_namespace *tomoyo_find_namespace
435 (const char *name, const unsigned int len)
437 struct tomoyo_policy_namespace *ns;
439 list_for_each_entry(ns, &tomoyo_namespace_list, namespace_list) {
440 if (strncmp(name, ns->name, len) ||
441 (name[len] && name[len] != ' '))
449 * tomoyo_assign_namespace - Create a new namespace.
451 * @domainname: Name of namespace to create.
453 * Returns pointer to "struct tomoyo_policy_namespace" on success,
456 * Caller holds tomoyo_read_lock().
458 struct tomoyo_policy_namespace *tomoyo_assign_namespace(const char *domainname)
460 struct tomoyo_policy_namespace *ptr;
461 struct tomoyo_policy_namespace *entry;
462 const char *cp = domainname;
463 unsigned int len = 0;
465 while (*cp && *cp++ != ' ')
467 ptr = tomoyo_find_namespace(domainname, len);
470 if (len >= TOMOYO_EXEC_TMPSIZE - 10 || !tomoyo_domain_def(domainname))
472 entry = kzalloc(sizeof(*entry) + len + 1, GFP_NOFS);
475 if (mutex_lock_interruptible(&tomoyo_policy_lock))
477 ptr = tomoyo_find_namespace(domainname, len);
478 if (!ptr && tomoyo_memory_ok(entry)) {
479 char *name = (char *) (entry + 1);
482 memmove(name, domainname, len);
485 tomoyo_init_policy_namespace(entry);
488 mutex_unlock(&tomoyo_policy_lock);
495 * tomoyo_namespace_jump - Check for namespace jump.
497 * @domainname: Name of domain.
499 * Returns true if namespace differs, false otherwise.
501 static bool tomoyo_namespace_jump(const char *domainname)
503 const char *namespace = tomoyo_current_namespace()->name;
504 const int len = strlen(namespace);
506 return strncmp(domainname, namespace, len) ||
507 (domainname[len] && domainname[len] != ' ');
511 * tomoyo_assign_domain - Create a domain or a namespace.
513 * @domainname: The name of domain.
514 * @transit: True if transit to domain found or created.
516 * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise.
518 * Caller holds tomoyo_read_lock().
520 struct tomoyo_domain_info *tomoyo_assign_domain(const char *domainname,
523 struct tomoyo_domain_info e = { };
524 struct tomoyo_domain_info *entry = tomoyo_find_domain(domainname);
525 bool created = false;
530 * Since namespace is created at runtime, profiles may
531 * not be created by the moment the process transits to
532 * that domain. Do not perform domain transition if
533 * profile for that domain is not yet created.
535 if (tomoyo_policy_loaded &&
536 !entry->ns->profile_ptr[entry->profile])
541 /* Requested domain does not exist. */
542 /* Don't create requested domain if domainname is invalid. */
543 if (strlen(domainname) >= TOMOYO_EXEC_TMPSIZE - 10 ||
544 !tomoyo_correct_domain(domainname))
547 * Since definition of profiles and acl_groups may differ across
548 * namespaces, do not inherit "use_profile" and "use_group" settings
549 * by automatically creating requested domain upon domain transition.
551 if (transit && tomoyo_namespace_jump(domainname))
553 e.ns = tomoyo_assign_namespace(domainname);
557 * "use_profile" and "use_group" settings for automatically created
558 * domains are inherited from current domain. These are 0 for manually
562 const struct tomoyo_domain_info *domain = tomoyo_domain();
564 e.profile = domain->profile;
565 memcpy(e.group, domain->group, sizeof(e.group));
567 e.domainname = tomoyo_get_name(domainname);
570 if (mutex_lock_interruptible(&tomoyo_policy_lock))
572 entry = tomoyo_find_domain(domainname);
574 entry = tomoyo_commit_ok(&e, sizeof(e));
576 INIT_LIST_HEAD(&entry->acl_info_list);
577 list_add_tail_rcu(&entry->list, &tomoyo_domain_list);
581 mutex_unlock(&tomoyo_policy_lock);
583 tomoyo_put_name(e.domainname);
584 if (entry && transit) {
586 struct tomoyo_request_info r;
589 tomoyo_init_request_info(&r, entry,
590 TOMOYO_MAC_FILE_EXECUTE);
592 tomoyo_write_log(&r, "use_profile %u\n",
594 for (i = 0; i < TOMOYO_MAX_ACL_GROUPS; i++)
595 if (test_bit(i, entry->group))
596 tomoyo_write_log(&r, "use_group %u\n",
598 tomoyo_update_stat(TOMOYO_STAT_POLICY_UPDATES);
605 * tomoyo_environ - Check permission for environment variable names.
607 * @ee: Pointer to "struct tomoyo_execve".
609 * Returns 0 on success, negative value otherwise.
611 static int tomoyo_environ(struct tomoyo_execve *ee)
613 struct tomoyo_request_info *r = &ee->r;
614 struct linux_binprm *bprm = ee->bprm;
615 /* env_page.data is allocated by tomoyo_dump_page(). */
616 struct tomoyo_page_dump env_page = { };
617 char *arg_ptr; /* Size is TOMOYO_EXEC_TMPSIZE bytes */
619 unsigned long pos = bprm->p;
620 int offset = pos % PAGE_SIZE;
621 int argv_count = bprm->argc;
622 int envp_count = bprm->envc;
625 ee->r.type = TOMOYO_MAC_ENVIRON;
626 ee->r.profile = r->domain->profile;
627 ee->r.mode = tomoyo_get_mode(r->domain->ns, ee->r.profile,
629 if (!r->mode || !envp_count)
631 arg_ptr = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS);
634 while (error == -ENOMEM) {
635 if (!tomoyo_dump_page(bprm, pos, &env_page))
637 pos += PAGE_SIZE - offset;
639 while (argv_count && offset < PAGE_SIZE) {
640 if (!env_page.data[offset++])
647 while (offset < PAGE_SIZE) {
648 const unsigned char c = env_page.data[offset++];
650 if (c && arg_len < TOMOYO_EXEC_TMPSIZE - 10) {
652 arg_ptr[arg_len++] = '\0';
653 } else if (c == '\\') {
654 arg_ptr[arg_len++] = '\\';
655 arg_ptr[arg_len++] = '\\';
656 } else if (c > ' ' && c < 127) {
657 arg_ptr[arg_len++] = c;
659 arg_ptr[arg_len++] = '\\';
660 arg_ptr[arg_len++] = (c >> 6) + '0';
662 = ((c >> 3) & 7) + '0';
663 arg_ptr[arg_len++] = (c & 7) + '0';
666 arg_ptr[arg_len] = '\0';
670 if (tomoyo_env_perm(r, arg_ptr)) {
683 if (r->mode != TOMOYO_CONFIG_ENFORCING)
685 kfree(env_page.data);
691 * tomoyo_find_next_domain - Find a domain.
693 * @bprm: Pointer to "struct linux_binprm".
695 * Returns 0 on success, negative value otherwise.
697 * Caller holds tomoyo_read_lock().
699 int tomoyo_find_next_domain(struct linux_binprm *bprm)
701 struct tomoyo_domain_info *old_domain = tomoyo_domain();
702 struct tomoyo_domain_info *domain = NULL;
703 const char *original_name = bprm->filename;
704 int retval = -ENOMEM;
705 bool reject_on_transition_failure = false;
706 const struct tomoyo_path_info *candidate;
707 struct tomoyo_path_info exename;
708 struct tomoyo_execve *ee = kzalloc(sizeof(*ee), GFP_NOFS);
712 ee->tmp = kzalloc(TOMOYO_EXEC_TMPSIZE, GFP_NOFS);
717 /* ee->dump->data is allocated by tomoyo_dump_page(). */
718 tomoyo_init_request_info(&ee->r, NULL, TOMOYO_MAC_FILE_EXECUTE);
721 ee->r.obj = &ee->obj;
722 ee->obj.path1 = bprm->file->f_path;
723 /* Get symlink's pathname of program. */
725 exename.name = tomoyo_realpath_nofollow(original_name);
728 tomoyo_fill_path_info(&exename);
730 /* Check 'aggregator' directive. */
732 struct tomoyo_aggregator *ptr;
733 struct list_head *list =
734 &old_domain->ns->policy_list[TOMOYO_ID_AGGREGATOR];
736 /* Check 'aggregator' directive. */
737 candidate = &exename;
738 list_for_each_entry_rcu(ptr, list, head.list) {
739 if (ptr->head.is_deleted ||
740 !tomoyo_path_matches_pattern(&exename,
743 candidate = ptr->aggregated_name;
748 /* Check execute permission. */
749 retval = tomoyo_execute_permission(&ee->r, candidate);
750 if (retval == TOMOYO_RETRY_REQUEST)
755 * To be able to specify domainnames with wildcards, use the
756 * pathname specified in the policy (which may contain
757 * wildcard) rather than the pathname passed to execve()
758 * (which never contains wildcard).
760 if (ee->r.param.path.matched_path)
761 candidate = ee->r.param.path.matched_path;
764 * Check for domain transition preference if "file execute" matched.
765 * If preference is given, make do_execve() fail if domain transition
766 * has failed, for domain transition preference should be used with
767 * destination domain defined.
769 if (ee->transition) {
770 const char *domainname = ee->transition->name;
772 reject_on_transition_failure = true;
773 if (!strcmp(domainname, "keep"))
774 goto force_keep_domain;
775 if (!strcmp(domainname, "child"))
776 goto force_child_domain;
777 if (!strcmp(domainname, "reset"))
778 goto force_reset_domain;
779 if (!strcmp(domainname, "initialize"))
780 goto force_initialize_domain;
781 if (!strcmp(domainname, "parent")) {
784 strncpy(ee->tmp, old_domain->domainname->name,
785 TOMOYO_EXEC_TMPSIZE - 1);
786 cp = strrchr(ee->tmp, ' ');
789 } else if (*domainname == '<')
790 strncpy(ee->tmp, domainname, TOMOYO_EXEC_TMPSIZE - 1);
792 snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
793 old_domain->domainname->name, domainname);
794 goto force_jump_domain;
797 * No domain transition preference specified.
798 * Calculate domain to transit to.
800 switch (tomoyo_transition_type(old_domain->ns, old_domain->domainname,
802 case TOMOYO_TRANSITION_CONTROL_RESET:
804 /* Transit to the root of specified namespace. */
805 snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "<%s>",
808 * Make do_execve() fail if domain transition across namespaces
811 reject_on_transition_failure = true;
813 case TOMOYO_TRANSITION_CONTROL_INITIALIZE:
814 force_initialize_domain:
815 /* Transit to the child of current namespace's root. */
816 snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
817 old_domain->ns->name, candidate->name);
819 case TOMOYO_TRANSITION_CONTROL_KEEP:
821 /* Keep current domain. */
825 if (old_domain == &tomoyo_kernel_domain &&
826 !tomoyo_policy_loaded) {
828 * Needn't to transit from kernel domain before
829 * starting /sbin/init. But transit from kernel domain
830 * if executing initializers because they might start
837 /* Normal domain transition. */
838 snprintf(ee->tmp, TOMOYO_EXEC_TMPSIZE - 1, "%s %s",
839 old_domain->domainname->name, candidate->name);
844 domain = tomoyo_assign_domain(ee->tmp, true);
847 else if (reject_on_transition_failure) {
848 pr_warn("ERROR: Domain '%s' not ready.\n", ee->tmp);
850 } else if (ee->r.mode == TOMOYO_CONFIG_ENFORCING)
854 if (!old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED]) {
855 old_domain->flags[TOMOYO_DIF_TRANSITION_FAILED] = true;
856 ee->r.granted = false;
857 tomoyo_write_log(&ee->r, "%s", tomoyo_dif
858 [TOMOYO_DIF_TRANSITION_FAILED]);
859 pr_warn("ERROR: Domain '%s' not defined.\n", ee->tmp);
865 /* Update reference count on "struct tomoyo_domain_info". */
867 struct tomoyo_task *s = tomoyo_task(current);
869 s->old_domain_info = s->domain_info;
870 s->domain_info = domain;
871 atomic_inc(&domain->users);
875 ee->r.domain = domain;
876 retval = tomoyo_environ(ee);
879 kfree(ee->dump.data);
885 * tomoyo_dump_page - Dump a page to buffer.
887 * @bprm: Pointer to "struct linux_binprm".
888 * @pos: Location to dump.
889 * @dump: Poiner to "struct tomoyo_page_dump".
891 * Returns true on success, false otherwise.
893 bool tomoyo_dump_page(struct linux_binprm *bprm, unsigned long pos,
894 struct tomoyo_page_dump *dump)
898 /* dump->data is released by tomoyo_find_next_domain(). */
900 dump->data = kzalloc(PAGE_SIZE, GFP_NOFS);
904 /* Same with get_arg_page(bprm, pos, 0) in fs/exec.c */
907 * This is called at execve() time in order to dig around
908 * in the argv/environment of the new proceess
909 * (represented by bprm). 'current' is the process doing
912 if (get_user_pages_remote(current, bprm->mm, pos, 1,
913 FOLL_FORCE, &page, NULL, NULL) <= 0)
916 page = bprm->page[pos / PAGE_SIZE];
918 if (page != dump->page) {
919 const unsigned int offset = pos % PAGE_SIZE;
921 * Maybe kmap()/kunmap() should be used here.
922 * But remove_arg_zero() uses kmap_atomic()/kunmap_atomic().
925 char *kaddr = kmap_atomic(page);
928 memcpy(dump->data + offset, kaddr + offset,
930 kunmap_atomic(kaddr);
932 /* Same with put_arg_page(page) in fs/exec.c */