2 * security/tomoyo/common.c
4 * Common functions for TOMOYO.
6 * Copyright (C) 2005-2010 NTT DATA CORPORATION
9 #include <linux/uaccess.h>
10 #include <linux/slab.h>
11 #include <linux/security.h>
14 static struct tomoyo_profile tomoyo_default_profile = {
15 .learning = &tomoyo_default_profile.preference,
16 .permissive = &tomoyo_default_profile.preference,
17 .enforcing = &tomoyo_default_profile.preference,
18 .preference.enforcing_verbose = true,
19 .preference.learning_max_entry = 2048,
20 .preference.learning_verbose = false,
21 .preference.permissive_verbose = true
24 /* Profile version. Currently only 20090903 is defined. */
25 static unsigned int tomoyo_profile_version;
27 /* Profile table. Memory is allocated as needed. */
28 static struct tomoyo_profile *tomoyo_profile_ptr[TOMOYO_MAX_PROFILES];
30 /* String table for functionality that takes 4 modes. */
31 static const char *tomoyo_mode[4] = {
32 "disabled", "learning", "permissive", "enforcing"
35 /* String table for /sys/kernel/security/tomoyo/profile */
36 static const char *tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
37 + TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
38 [TOMOYO_MAC_FILE_EXECUTE] = "file::execute",
39 [TOMOYO_MAC_FILE_OPEN] = "file::open",
40 [TOMOYO_MAC_FILE_CREATE] = "file::create",
41 [TOMOYO_MAC_FILE_UNLINK] = "file::unlink",
42 [TOMOYO_MAC_FILE_MKDIR] = "file::mkdir",
43 [TOMOYO_MAC_FILE_RMDIR] = "file::rmdir",
44 [TOMOYO_MAC_FILE_MKFIFO] = "file::mkfifo",
45 [TOMOYO_MAC_FILE_MKSOCK] = "file::mksock",
46 [TOMOYO_MAC_FILE_TRUNCATE] = "file::truncate",
47 [TOMOYO_MAC_FILE_SYMLINK] = "file::symlink",
48 [TOMOYO_MAC_FILE_REWRITE] = "file::rewrite",
49 [TOMOYO_MAC_FILE_MKBLOCK] = "file::mkblock",
50 [TOMOYO_MAC_FILE_MKCHAR] = "file::mkchar",
51 [TOMOYO_MAC_FILE_LINK] = "file::link",
52 [TOMOYO_MAC_FILE_RENAME] = "file::rename",
53 [TOMOYO_MAC_FILE_CHMOD] = "file::chmod",
54 [TOMOYO_MAC_FILE_CHOWN] = "file::chown",
55 [TOMOYO_MAC_FILE_CHGRP] = "file::chgrp",
56 [TOMOYO_MAC_FILE_IOCTL] = "file::ioctl",
57 [TOMOYO_MAC_FILE_CHROOT] = "file::chroot",
58 [TOMOYO_MAC_FILE_MOUNT] = "file::mount",
59 [TOMOYO_MAC_FILE_UMOUNT] = "file::umount",
60 [TOMOYO_MAC_FILE_PIVOT_ROOT] = "file::pivot_root",
61 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file",
64 /* Permit policy management by non-root user? */
65 static bool tomoyo_manage_by_non_root;
67 /* Utility functions. */
70 * tomoyo_yesno - Return "yes" or "no".
74 static const char *tomoyo_yesno(const unsigned int value)
76 return value ? "yes" : "no";
79 static void tomoyo_addprintf(char *buffer, int len, const char *fmt, ...)
82 const int pos = strlen(buffer);
84 vsnprintf(buffer + pos, len - pos - 1, fmt, args);
89 * tomoyo_flush - Flush queued string to userspace's buffer.
91 * @head: Pointer to "struct tomoyo_io_buffer".
93 * Returns true if all data was flushed, false otherwise.
95 static bool tomoyo_flush(struct tomoyo_io_buffer *head)
97 while (head->r.w_pos) {
98 const char *w = head->r.w[0];
101 if (len > head->read_user_buf_avail)
102 len = head->read_user_buf_avail;
105 if (copy_to_user(head->read_user_buf, w, len))
107 head->read_user_buf_avail -= len;
108 head->read_user_buf += len;
115 /* Add '\0' for query. */
117 if (!head->read_user_buf_avail ||
118 copy_to_user(head->read_user_buf, "", 1))
120 head->read_user_buf_avail--;
121 head->read_user_buf++;
124 for (len = 0; len < head->r.w_pos; len++)
125 head->r.w[len] = head->r.w[len + 1];
132 * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure.
134 * @head: Pointer to "struct tomoyo_io_buffer".
135 * @string: String to print.
137 * Note that @string has to be kept valid until @head is kfree()d.
138 * This means that char[] allocated on stack memory cannot be passed to
139 * this function. Use tomoyo_io_printf() for char[] allocated on stack memory.
141 static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string)
143 if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) {
144 head->r.w[head->r.w_pos++] = string;
151 * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
153 * @head: Pointer to "struct tomoyo_io_buffer".
154 * @fmt: The printf()'s format string, followed by parameters.
156 void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
160 int pos = head->r.avail;
161 int size = head->readbuf_size - pos;
165 len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
167 if (pos + len >= head->readbuf_size) {
171 head->r.avail += len;
172 tomoyo_set_string(head, head->read_buf + pos);
175 static void tomoyo_set_space(struct tomoyo_io_buffer *head)
177 tomoyo_set_string(head, " ");
180 static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
182 tomoyo_set_string(head, "\n");
183 return !head->r.w_pos;
187 * tomoyo_print_name_union - Print a tomoyo_name_union.
189 * @head: Pointer to "struct tomoyo_io_buffer".
190 * @ptr: Pointer to "struct tomoyo_name_union".
192 static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
193 const struct tomoyo_name_union *ptr)
195 tomoyo_set_space(head);
197 tomoyo_set_string(head, "@");
198 tomoyo_set_string(head, ptr->group->group_name->name);
200 tomoyo_set_string(head, ptr->filename->name);
205 * tomoyo_print_number_union - Print a tomoyo_number_union.
207 * @head: Pointer to "struct tomoyo_io_buffer".
208 * @ptr: Pointer to "struct tomoyo_number_union".
210 static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
211 const struct tomoyo_number_union *ptr)
213 tomoyo_set_space(head);
215 tomoyo_set_string(head, "@");
216 tomoyo_set_string(head, ptr->group->group_name->name);
219 unsigned long min = ptr->values[0];
220 const unsigned long max = ptr->values[1];
221 u8 min_type = ptr->min_type;
222 const u8 max_type = ptr->max_type;
225 for (i = 0; i < 2; i++) {
227 case TOMOYO_VALUE_TYPE_HEXADECIMAL:
228 tomoyo_addprintf(buffer, sizeof(buffer),
231 case TOMOYO_VALUE_TYPE_OCTAL:
232 tomoyo_addprintf(buffer, sizeof(buffer),
236 tomoyo_addprintf(buffer, sizeof(buffer),
240 if (min == max && min_type == max_type)
242 tomoyo_addprintf(buffer, sizeof(buffer), "-");
246 tomoyo_io_printf(head, "%s", buffer);
251 * tomoyo_assign_profile - Create a new profile.
253 * @profile: Profile number to create.
255 * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
257 static struct tomoyo_profile *tomoyo_assign_profile(const unsigned int profile)
259 struct tomoyo_profile *ptr;
260 struct tomoyo_profile *entry;
261 if (profile >= TOMOYO_MAX_PROFILES)
263 ptr = tomoyo_profile_ptr[profile];
266 entry = kzalloc(sizeof(*entry), GFP_NOFS);
267 if (mutex_lock_interruptible(&tomoyo_policy_lock))
269 ptr = tomoyo_profile_ptr[profile];
270 if (!ptr && tomoyo_memory_ok(entry)) {
272 ptr->learning = &tomoyo_default_profile.preference;
273 ptr->permissive = &tomoyo_default_profile.preference;
274 ptr->enforcing = &tomoyo_default_profile.preference;
275 ptr->default_config = TOMOYO_CONFIG_DISABLED;
276 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
277 sizeof(ptr->config));
278 mb(); /* Avoid out-of-order execution. */
279 tomoyo_profile_ptr[profile] = ptr;
282 mutex_unlock(&tomoyo_policy_lock);
289 * tomoyo_profile - Find a profile.
291 * @profile: Profile number to find.
293 * Returns pointer to "struct tomoyo_profile".
295 struct tomoyo_profile *tomoyo_profile(const u8 profile)
297 struct tomoyo_profile *ptr = tomoyo_profile_ptr[profile];
298 if (!tomoyo_policy_loaded)
299 return &tomoyo_default_profile;
304 static s8 tomoyo_find_yesno(const char *string, const char *find)
306 const char *cp = strstr(string, find);
309 if (!strncmp(cp, "=yes", 4))
311 else if (!strncmp(cp, "=no", 3))
317 static void tomoyo_set_bool(bool *b, const char *string, const char *find)
319 switch (tomoyo_find_yesno(string, find)) {
329 static void tomoyo_set_uint(unsigned int *i, const char *string,
332 const char *cp = strstr(string, find);
334 sscanf(cp + strlen(find), "=%u", i);
337 static void tomoyo_set_pref(const char *name, const char *value,
338 const bool use_default,
339 struct tomoyo_profile *profile)
341 struct tomoyo_preference **pref;
343 if (!strcmp(name, "enforcing")) {
345 pref = &profile->enforcing;
348 profile->enforcing = &profile->preference;
349 verbose = &profile->preference.enforcing_verbose;
352 if (!strcmp(name, "permissive")) {
354 pref = &profile->permissive;
357 profile->permissive = &profile->preference;
358 verbose = &profile->preference.permissive_verbose;
361 if (!strcmp(name, "learning")) {
363 pref = &profile->learning;
366 profile->learning = &profile->preference;
367 tomoyo_set_uint(&profile->preference.learning_max_entry, value,
369 verbose = &profile->preference.learning_verbose;
374 *pref = &tomoyo_default_profile.preference;
377 tomoyo_set_bool(verbose, value, "verbose");
380 static int tomoyo_set_mode(char *name, const char *value,
381 const bool use_default,
382 struct tomoyo_profile *profile)
386 if (!strcmp(name, "CONFIG")) {
387 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
388 config = profile->default_config;
389 } else if (tomoyo_str_starts(&name, "CONFIG::")) {
391 for (i = 0; i < TOMOYO_MAX_MAC_INDEX
392 + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
393 if (strcmp(name, tomoyo_mac_keywords[i]))
395 config = profile->config[i];
398 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
404 config = TOMOYO_CONFIG_USE_DEFAULT;
407 for (mode = 0; mode < 4; mode++)
408 if (strstr(value, tomoyo_mode[mode]))
410 * Update lower 3 bits in order to distinguish
411 * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
413 config = (config & ~7) | mode;
415 if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
416 profile->config[i] = config;
417 else if (config != TOMOYO_CONFIG_USE_DEFAULT)
418 profile->default_config = config;
423 * tomoyo_write_profile - Write profile table.
425 * @head: Pointer to "struct tomoyo_io_buffer".
427 * Returns 0 on success, negative value otherwise.
429 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
431 char *data = head->write_buf;
433 bool use_default = false;
435 struct tomoyo_profile *profile;
436 if (sscanf(data, "PROFILE_VERSION=%u", &tomoyo_profile_version) == 1)
438 i = simple_strtoul(data, &cp, 10);
440 profile = &tomoyo_default_profile;
445 profile = tomoyo_assign_profile(i);
449 cp = strchr(data, '=');
453 if (profile != &tomoyo_default_profile)
454 use_default = strstr(cp, "use_default") != NULL;
455 if (tomoyo_str_starts(&data, "PREFERENCE::")) {
456 tomoyo_set_pref(data, cp, use_default, profile);
459 if (profile == &tomoyo_default_profile)
461 if (!strcmp(data, "COMMENT")) {
462 const struct tomoyo_path_info *old_comment = profile->comment;
463 profile->comment = tomoyo_get_name(cp);
464 tomoyo_put_name(old_comment);
467 return tomoyo_set_mode(data, cp, use_default, profile);
470 static void tomoyo_print_preference(struct tomoyo_io_buffer *head,
473 struct tomoyo_preference *pref = &tomoyo_default_profile.preference;
474 const struct tomoyo_profile *profile = idx >= 0 ?
475 tomoyo_profile_ptr[idx] : NULL;
476 char buffer[16] = "";
478 buffer[sizeof(buffer) - 1] = '\0';
479 snprintf(buffer, sizeof(buffer) - 1, "%u-", idx);
482 pref = profile->learning;
483 if (pref == &tomoyo_default_profile.preference)
486 tomoyo_io_printf(head, "%sPREFERENCE::%s={ "
487 "verbose=%s max_entry=%u }\n",
489 tomoyo_yesno(pref->learning_verbose),
490 pref->learning_max_entry);
493 pref = profile->permissive;
494 if (pref == &tomoyo_default_profile.preference)
497 tomoyo_io_printf(head, "%sPREFERENCE::%s={ verbose=%s }\n",
498 buffer, "permissive",
499 tomoyo_yesno(pref->permissive_verbose));
502 pref = profile->enforcing;
503 if (pref == &tomoyo_default_profile.preference)
506 tomoyo_io_printf(head, "%sPREFERENCE::%s={ verbose=%s }\n",
508 tomoyo_yesno(pref->enforcing_verbose));
511 static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
513 tomoyo_io_printf(head, "={ mode=%s }\n", tomoyo_mode[config & 3]);
517 * tomoyo_read_profile - Read profile table.
519 * @head: Pointer to "struct tomoyo_io_buffer".
521 static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
524 const struct tomoyo_profile *profile;
526 index = head->r.index;
527 profile = tomoyo_profile_ptr[index];
528 switch (head->r.step) {
530 tomoyo_io_printf(head, "PROFILE_VERSION=%s\n", "20090903");
531 tomoyo_print_preference(head, -1);
535 for ( ; head->r.index < TOMOYO_MAX_PROFILES;
537 if (tomoyo_profile_ptr[head->r.index])
539 if (head->r.index == TOMOYO_MAX_PROFILES)
545 const struct tomoyo_path_info *comment =
547 tomoyo_io_printf(head, "%u-COMMENT=", index);
548 tomoyo_set_string(head, comment ? comment->name : "");
555 tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
556 tomoyo_print_config(head, profile->default_config);
562 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
563 + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
564 const u8 i = head->r.bit;
565 const u8 config = profile->config[i];
566 if (config == TOMOYO_CONFIG_USE_DEFAULT)
568 tomoyo_io_printf(head, "%u-%s%s", index, "CONFIG::",
569 tomoyo_mac_keywords[i]);
570 tomoyo_print_config(head, config);
574 if (head->r.bit == TOMOYO_MAX_MAC_INDEX
575 + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
576 tomoyo_print_preference(head, index);
582 if (tomoyo_flush(head))
586 static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
587 const struct tomoyo_acl_head *b)
589 return container_of(a, struct tomoyo_manager, head)->manager ==
590 container_of(b, struct tomoyo_manager, head)->manager;
594 * tomoyo_update_manager_entry - Add a manager entry.
596 * @manager: The path to manager or the domainnamme.
597 * @is_delete: True if it is a delete request.
599 * Returns 0 on success, negative value otherwise.
601 * Caller holds tomoyo_read_lock().
603 static int tomoyo_update_manager_entry(const char *manager,
604 const bool is_delete)
606 struct tomoyo_manager e = { };
609 if (tomoyo_domain_def(manager)) {
610 if (!tomoyo_correct_domain(manager))
614 if (!tomoyo_correct_path(manager))
617 e.manager = tomoyo_get_name(manager);
620 error = tomoyo_update_policy(&e.head, sizeof(e), is_delete,
621 &tomoyo_policy_list[TOMOYO_ID_MANAGER],
622 tomoyo_same_manager);
623 tomoyo_put_name(e.manager);
628 * tomoyo_write_manager - Write manager policy.
630 * @head: Pointer to "struct tomoyo_io_buffer".
632 * Returns 0 on success, negative value otherwise.
634 * Caller holds tomoyo_read_lock().
636 static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
638 char *data = head->write_buf;
639 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
641 if (!strcmp(data, "manage_by_non_root")) {
642 tomoyo_manage_by_non_root = !is_delete;
645 return tomoyo_update_manager_entry(data, is_delete);
649 * tomoyo_read_manager - Read manager policy.
651 * @head: Pointer to "struct tomoyo_io_buffer".
653 * Caller holds tomoyo_read_lock().
655 static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
659 list_for_each_cookie(head->r.acl,
660 &tomoyo_policy_list[TOMOYO_ID_MANAGER]) {
661 struct tomoyo_manager *ptr =
662 list_entry(head->r.acl, typeof(*ptr), head.list);
663 if (ptr->head.is_deleted)
665 if (!tomoyo_flush(head))
667 tomoyo_set_string(head, ptr->manager->name);
674 * tomoyo_manager - Check whether the current process is a policy manager.
676 * Returns true if the current process is permitted to modify policy
677 * via /sys/kernel/security/tomoyo/ interface.
679 * Caller holds tomoyo_read_lock().
681 static bool tomoyo_manager(void)
683 struct tomoyo_manager *ptr;
685 const struct task_struct *task = current;
686 const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
689 if (!tomoyo_policy_loaded)
691 if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
693 list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_MANAGER],
695 if (!ptr->head.is_deleted && ptr->is_domain
696 && !tomoyo_pathcmp(domainname, ptr->manager)) {
703 exe = tomoyo_get_exe();
706 list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_MANAGER],
708 if (!ptr->head.is_deleted && !ptr->is_domain
709 && !strcmp(exe, ptr->manager->name)) {
714 if (!found) { /* Reduce error messages. */
715 static pid_t last_pid;
716 const pid_t pid = current->pid;
717 if (last_pid != pid) {
718 printk(KERN_WARNING "%s ( %s ) is not permitted to "
719 "update policies.\n", domainname->name, exe);
728 * tomoyo_select_one - Parse select command.
730 * @head: Pointer to "struct tomoyo_io_buffer".
731 * @data: String to parse.
733 * Returns true on success, false otherwise.
735 * Caller holds tomoyo_read_lock().
737 static bool tomoyo_select_one(struct tomoyo_io_buffer *head, const char *data)
740 struct tomoyo_domain_info *domain = NULL;
741 bool global_pid = false;
743 if (!strcmp(data, "allow_execute")) {
744 head->r.print_execute_only = true;
747 if (sscanf(data, "pid=%u", &pid) == 1 ||
748 (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
749 struct task_struct *p;
751 read_lock(&tasklist_lock);
753 p = find_task_by_pid_ns(pid, &init_pid_ns);
755 p = find_task_by_vpid(pid);
757 domain = tomoyo_real_domain(p);
758 read_unlock(&tasklist_lock);
760 } else if (!strncmp(data, "domain=", 7)) {
761 if (tomoyo_domain_def(data + 7))
762 domain = tomoyo_find_domain(data + 7);
765 head->write_var1 = domain;
766 /* Accessing read_buf is safe because head->io_sem is held. */
768 return true; /* Do nothing if open(O_WRONLY). */
769 memset(&head->r, 0, sizeof(head->r));
770 head->r.print_this_domain_only = true;
772 head->r.domain = &domain->list;
775 tomoyo_io_printf(head, "# select %s\n", data);
776 if (domain && domain->is_deleted)
777 tomoyo_io_printf(head, "# This is a deleted domain.\n");
782 * tomoyo_delete_domain - Delete a domain.
784 * @domainname: The name of domain.
788 * Caller holds tomoyo_read_lock().
790 static int tomoyo_delete_domain(char *domainname)
792 struct tomoyo_domain_info *domain;
793 struct tomoyo_path_info name;
795 name.name = domainname;
796 tomoyo_fill_path_info(&name);
797 if (mutex_lock_interruptible(&tomoyo_policy_lock))
799 /* Is there an active domain? */
800 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
801 /* Never delete tomoyo_kernel_domain */
802 if (domain == &tomoyo_kernel_domain)
804 if (domain->is_deleted ||
805 tomoyo_pathcmp(domain->domainname, &name))
807 domain->is_deleted = true;
810 mutex_unlock(&tomoyo_policy_lock);
815 * tomoyo_write_domain2 - Write domain policy.
817 * @head: Pointer to "struct tomoyo_io_buffer".
819 * Returns 0 on success, negative value otherwise.
821 * Caller holds tomoyo_read_lock().
823 static int tomoyo_write_domain2(char *data, struct tomoyo_domain_info *domain,
824 const bool is_delete)
826 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_MOUNT))
827 return tomoyo_write_mount(data, domain, is_delete);
828 return tomoyo_write_file(data, domain, is_delete);
832 * tomoyo_write_domain - Write domain policy.
834 * @head: Pointer to "struct tomoyo_io_buffer".
836 * Returns 0 on success, negative value otherwise.
838 * Caller holds tomoyo_read_lock().
840 static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
842 char *data = head->write_buf;
843 struct tomoyo_domain_info *domain = head->write_var1;
844 bool is_delete = false;
845 bool is_select = false;
846 unsigned int profile;
848 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE))
850 else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT))
852 if (is_select && tomoyo_select_one(head, data))
854 /* Don't allow updating policies by non manager programs. */
855 if (!tomoyo_manager())
857 if (tomoyo_domain_def(data)) {
860 tomoyo_delete_domain(data);
862 domain = tomoyo_find_domain(data);
864 domain = tomoyo_assign_domain(data, 0);
865 head->write_var1 = domain;
871 if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1
872 && profile < TOMOYO_MAX_PROFILES) {
873 if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)
874 domain->profile = (u8) profile;
877 if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) {
878 domain->ignore_global_allow_read = !is_delete;
881 if (!strcmp(data, TOMOYO_KEYWORD_QUOTA_EXCEEDED)) {
882 domain->quota_warned = !is_delete;
885 if (!strcmp(data, TOMOYO_KEYWORD_TRANSITION_FAILED)) {
886 domain->transition_failed = !is_delete;
889 return tomoyo_write_domain2(data, domain, is_delete);
893 * tomoyo_fns - Find next set bit.
895 * @perm: 8 bits value.
896 * @bit: First bit to find.
898 * Returns next on-bit on success, 8 otherwise.
900 static u8 tomoyo_fns(const u8 perm, u8 bit)
902 for ( ; bit < 8; bit++)
903 if (perm & (1 << bit))
909 * tomoyo_print_entry - Print an ACL entry.
911 * @head: Pointer to "struct tomoyo_io_buffer".
912 * @acl: Pointer to an ACL entry.
914 * Returns true on success, false otherwise.
916 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
917 struct tomoyo_acl_info *acl)
919 const u8 acl_type = acl->type;
926 if (!tomoyo_flush(head))
928 else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
929 struct tomoyo_path_acl *ptr =
930 container_of(acl, typeof(*ptr), head);
931 const u16 perm = ptr->perm;
932 for ( ; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
933 if (!(perm & (1 << bit)))
935 if (head->r.print_execute_only &&
936 bit != TOMOYO_TYPE_EXECUTE)
938 /* Print "read/write" instead of "read" and "write". */
939 if ((bit == TOMOYO_TYPE_READ ||
940 bit == TOMOYO_TYPE_WRITE)
941 && (perm & (1 << TOMOYO_TYPE_READ_WRITE)))
945 if (bit >= TOMOYO_MAX_PATH_OPERATION)
947 tomoyo_io_printf(head, "allow_%s", tomoyo_path_keyword[bit]);
948 tomoyo_print_name_union(head, &ptr->name);
949 } else if (head->r.print_execute_only) {
951 } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
952 struct tomoyo_path2_acl *ptr =
953 container_of(acl, typeof(*ptr), head);
954 bit = tomoyo_fns(ptr->perm, bit);
955 if (bit >= TOMOYO_MAX_PATH2_OPERATION)
957 tomoyo_io_printf(head, "allow_%s", tomoyo_path2_keyword[bit]);
958 tomoyo_print_name_union(head, &ptr->name1);
959 tomoyo_print_name_union(head, &ptr->name2);
960 } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
961 struct tomoyo_path_number_acl *ptr =
962 container_of(acl, typeof(*ptr), head);
963 bit = tomoyo_fns(ptr->perm, bit);
964 if (bit >= TOMOYO_MAX_PATH_NUMBER_OPERATION)
966 tomoyo_io_printf(head, "allow_%s",
967 tomoyo_path_number_keyword[bit]);
968 tomoyo_print_name_union(head, &ptr->name);
969 tomoyo_print_number_union(head, &ptr->number);
970 } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
971 struct tomoyo_mkdev_acl *ptr =
972 container_of(acl, typeof(*ptr), head);
973 bit = tomoyo_fns(ptr->perm, bit);
974 if (bit >= TOMOYO_MAX_MKDEV_OPERATION)
976 tomoyo_io_printf(head, "allow_%s", tomoyo_mkdev_keyword[bit]);
977 tomoyo_print_name_union(head, &ptr->name);
978 tomoyo_print_number_union(head, &ptr->mode);
979 tomoyo_print_number_union(head, &ptr->major);
980 tomoyo_print_number_union(head, &ptr->minor);
981 } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
982 struct tomoyo_mount_acl *ptr =
983 container_of(acl, typeof(*ptr), head);
984 tomoyo_io_printf(head, "allow_mount");
985 tomoyo_print_name_union(head, &ptr->dev_name);
986 tomoyo_print_name_union(head, &ptr->dir_name);
987 tomoyo_print_name_union(head, &ptr->fs_type);
988 tomoyo_print_number_union(head, &ptr->flags);
990 head->r.bit = bit + 1;
991 tomoyo_io_printf(head, "\n");
992 if (acl_type != TOMOYO_TYPE_MOUNT_ACL)
1000 * tomoyo_read_domain2 - Read domain policy.
1002 * @head: Pointer to "struct tomoyo_io_buffer".
1003 * @domain: Pointer to "struct tomoyo_domain_info".
1005 * Caller holds tomoyo_read_lock().
1007 * Returns true on success, false otherwise.
1009 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1010 struct tomoyo_domain_info *domain)
1012 list_for_each_cookie(head->r.acl, &domain->acl_info_list) {
1013 struct tomoyo_acl_info *ptr =
1014 list_entry(head->r.acl, typeof(*ptr), list);
1015 if (!tomoyo_print_entry(head, ptr))
1023 * tomoyo_read_domain - Read domain policy.
1025 * @head: Pointer to "struct tomoyo_io_buffer".
1027 * Caller holds tomoyo_read_lock().
1029 static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1033 list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1034 struct tomoyo_domain_info *domain =
1035 list_entry(head->r.domain, typeof(*domain), list);
1036 switch (head->r.step) {
1038 if (domain->is_deleted &&
1039 !head->r.print_this_domain_only)
1041 /* Print domainname and flags. */
1042 tomoyo_set_string(head, domain->domainname->name);
1043 tomoyo_set_lf(head);
1044 tomoyo_io_printf(head,
1045 TOMOYO_KEYWORD_USE_PROFILE "%u\n",
1047 if (domain->quota_warned)
1048 tomoyo_set_string(head, "quota_exceeded\n");
1049 if (domain->transition_failed)
1050 tomoyo_set_string(head, "transition_failed\n");
1051 if (domain->ignore_global_allow_read)
1052 tomoyo_set_string(head,
1053 TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ
1056 tomoyo_set_lf(head);
1059 if (!tomoyo_read_domain2(head, domain))
1062 if (!tomoyo_set_lf(head))
1067 if (head->r.print_this_domain_only)
1076 * tomoyo_write_domain_profile - Assign profile for specified domain.
1078 * @head: Pointer to "struct tomoyo_io_buffer".
1080 * Returns 0 on success, -EINVAL otherwise.
1082 * This is equivalent to doing
1084 * ( echo "select " $domainname; echo "use_profile " $profile ) |
1085 * /usr/sbin/tomoyo-loadpolicy -d
1087 * Caller holds tomoyo_read_lock().
1089 static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head)
1091 char *data = head->write_buf;
1092 char *cp = strchr(data, ' ');
1093 struct tomoyo_domain_info *domain;
1094 unsigned long profile;
1099 domain = tomoyo_find_domain(cp + 1);
1100 if (strict_strtoul(data, 10, &profile))
1102 if (domain && profile < TOMOYO_MAX_PROFILES
1103 && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded))
1104 domain->profile = (u8) profile;
1109 * tomoyo_read_domain_profile - Read only domainname and profile.
1111 * @head: Pointer to "struct tomoyo_io_buffer".
1113 * Returns list of profile number and domainname pairs.
1115 * This is equivalent to doing
1117 * grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy |
1118 * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" )
1119 * domainname = $0; } else if ( $1 == "use_profile" ) {
1120 * print $2 " " domainname; domainname = ""; } } ; '
1122 * Caller holds tomoyo_read_lock().
1124 static void tomoyo_read_domain_profile(struct tomoyo_io_buffer *head)
1128 list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1129 struct tomoyo_domain_info *domain =
1130 list_entry(head->r.domain, typeof(*domain), list);
1131 if (domain->is_deleted)
1133 if (!tomoyo_flush(head))
1135 tomoyo_io_printf(head, "%u ", domain->profile);
1136 tomoyo_set_string(head, domain->domainname->name);
1137 tomoyo_set_lf(head);
1143 * tomoyo_write_pid: Specify PID to obtain domainname.
1145 * @head: Pointer to "struct tomoyo_io_buffer".
1149 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1151 head->r.eof = false;
1156 * tomoyo_read_pid - Get domainname of the specified PID.
1158 * @head: Pointer to "struct tomoyo_io_buffer".
1160 * Returns the domainname which the specified PID is in on success,
1161 * empty string otherwise.
1162 * The PID is specified by tomoyo_write_pid() so that the user can obtain
1163 * using read()/write() interface rather than sysctl() interface.
1165 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1167 char *buf = head->write_buf;
1168 bool global_pid = false;
1170 struct task_struct *p;
1171 struct tomoyo_domain_info *domain = NULL;
1173 /* Accessing write_buf is safe because head->io_sem is held. */
1176 return; /* Do nothing if open(O_RDONLY). */
1178 if (head->r.w_pos || head->r.eof)
1181 if (tomoyo_str_starts(&buf, "global-pid "))
1183 pid = (unsigned int) simple_strtoul(buf, NULL, 10);
1185 read_lock(&tasklist_lock);
1187 p = find_task_by_pid_ns(pid, &init_pid_ns);
1189 p = find_task_by_vpid(pid);
1191 domain = tomoyo_real_domain(p);
1192 read_unlock(&tasklist_lock);
1196 tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1197 tomoyo_set_string(head, domain->domainname->name);
1200 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1201 [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE]
1202 = TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN,
1203 [TOMOYO_TRANSITION_CONTROL_INITIALIZE]
1204 = TOMOYO_KEYWORD_INITIALIZE_DOMAIN,
1205 [TOMOYO_TRANSITION_CONTROL_NO_KEEP] = TOMOYO_KEYWORD_NO_KEEP_DOMAIN,
1206 [TOMOYO_TRANSITION_CONTROL_KEEP] = TOMOYO_KEYWORD_KEEP_DOMAIN
1209 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1210 [TOMOYO_PATH_GROUP] = TOMOYO_KEYWORD_PATH_GROUP,
1211 [TOMOYO_NUMBER_GROUP] = TOMOYO_KEYWORD_NUMBER_GROUP
1215 * tomoyo_write_exception - Write exception policy.
1217 * @head: Pointer to "struct tomoyo_io_buffer".
1219 * Returns 0 on success, negative value otherwise.
1221 * Caller holds tomoyo_read_lock().
1223 static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1225 char *data = head->write_buf;
1226 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
1228 static const struct {
1229 const char *keyword;
1230 int (*write) (char *, const bool);
1231 } tomoyo_callback[4] = {
1232 { TOMOYO_KEYWORD_AGGREGATOR, tomoyo_write_aggregator },
1233 { TOMOYO_KEYWORD_FILE_PATTERN, tomoyo_write_pattern },
1234 { TOMOYO_KEYWORD_DENY_REWRITE, tomoyo_write_no_rewrite },
1235 { TOMOYO_KEYWORD_ALLOW_READ, tomoyo_write_globally_readable },
1238 for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1239 if (tomoyo_str_starts(&data, tomoyo_transition_type[i]))
1240 return tomoyo_write_transition_control(data, is_delete,
1242 for (i = 0; i < 4; i++)
1243 if (tomoyo_str_starts(&data, tomoyo_callback[i].keyword))
1244 return tomoyo_callback[i].write(data, is_delete);
1245 for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1246 if (tomoyo_str_starts(&data, tomoyo_group_name[i]))
1247 return tomoyo_write_group(data, is_delete, i);
1252 * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group" list.
1254 * @head: Pointer to "struct tomoyo_io_buffer".
1255 * @idx: Index number.
1257 * Returns true on success, false otherwise.
1259 * Caller holds tomoyo_read_lock().
1261 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1263 list_for_each_cookie(head->r.group, &tomoyo_group_list[idx]) {
1264 struct tomoyo_group *group =
1265 list_entry(head->r.group, typeof(*group), list);
1266 list_for_each_cookie(head->r.acl, &group->member_list) {
1267 struct tomoyo_acl_head *ptr =
1268 list_entry(head->r.acl, typeof(*ptr), list);
1269 if (ptr->is_deleted)
1271 if (!tomoyo_flush(head))
1273 tomoyo_set_string(head, tomoyo_group_name[idx]);
1274 tomoyo_set_string(head, group->group_name->name);
1275 if (idx == TOMOYO_PATH_GROUP) {
1276 tomoyo_set_space(head);
1277 tomoyo_set_string(head, container_of
1278 (ptr, struct tomoyo_path_group,
1279 head)->member_name->name);
1280 } else if (idx == TOMOYO_NUMBER_GROUP) {
1281 tomoyo_print_number_union(head, &container_of
1283 struct tomoyo_number_group,
1286 tomoyo_set_lf(head);
1290 head->r.group = NULL;
1295 * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1297 * @head: Pointer to "struct tomoyo_io_buffer".
1298 * @idx: Index number.
1300 * Returns true on success, false otherwise.
1302 * Caller holds tomoyo_read_lock().
1304 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1306 list_for_each_cookie(head->r.acl, &tomoyo_policy_list[idx]) {
1307 struct tomoyo_acl_head *acl =
1308 container_of(head->r.acl, typeof(*acl), list);
1309 if (acl->is_deleted)
1311 if (!tomoyo_flush(head))
1314 case TOMOYO_ID_TRANSITION_CONTROL:
1316 struct tomoyo_transition_control *ptr =
1317 container_of(acl, typeof(*ptr), head);
1318 tomoyo_set_string(head,
1319 tomoyo_transition_type
1322 tomoyo_set_string(head,
1323 ptr->program->name);
1324 if (ptr->program && ptr->domainname)
1325 tomoyo_set_string(head, " from ");
1326 if (ptr->domainname)
1327 tomoyo_set_string(head,
1332 case TOMOYO_ID_GLOBALLY_READABLE:
1334 struct tomoyo_readable_file *ptr =
1335 container_of(acl, typeof(*ptr), head);
1336 tomoyo_set_string(head,
1337 TOMOYO_KEYWORD_ALLOW_READ);
1338 tomoyo_set_string(head, ptr->filename->name);
1341 case TOMOYO_ID_AGGREGATOR:
1343 struct tomoyo_aggregator *ptr =
1344 container_of(acl, typeof(*ptr), head);
1345 tomoyo_set_string(head,
1346 TOMOYO_KEYWORD_AGGREGATOR);
1347 tomoyo_set_string(head,
1348 ptr->original_name->name);
1349 tomoyo_set_space(head);
1350 tomoyo_set_string(head,
1351 ptr->aggregated_name->name);
1354 case TOMOYO_ID_PATTERN:
1356 struct tomoyo_no_pattern *ptr =
1357 container_of(acl, typeof(*ptr), head);
1358 tomoyo_set_string(head,
1359 TOMOYO_KEYWORD_FILE_PATTERN);
1360 tomoyo_set_string(head, ptr->pattern->name);
1363 case TOMOYO_ID_NO_REWRITE:
1365 struct tomoyo_no_rewrite *ptr =
1366 container_of(acl, typeof(*ptr), head);
1367 tomoyo_set_string(head,
1368 TOMOYO_KEYWORD_DENY_REWRITE);
1369 tomoyo_set_string(head, ptr->pattern->name);
1375 tomoyo_set_lf(head);
1382 * tomoyo_read_exception - Read exception policy.
1384 * @head: Pointer to "struct tomoyo_io_buffer".
1386 * Caller holds tomoyo_read_lock().
1388 static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1392 while (head->r.step < TOMOYO_MAX_POLICY &&
1393 tomoyo_read_policy(head, head->r.step))
1395 if (head->r.step < TOMOYO_MAX_POLICY)
1397 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1398 tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1400 if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1406 * tomoyo_print_header - Get header line of audit log.
1408 * @r: Pointer to "struct tomoyo_request_info".
1410 * Returns string representation.
1412 * This function uses kmalloc(), so caller must kfree() if this function
1413 * didn't return NULL.
1415 static char *tomoyo_print_header(struct tomoyo_request_info *r)
1418 const pid_t gpid = task_pid_nr(current);
1419 static const int tomoyo_buffer_len = 4096;
1420 char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS);
1424 do_gettimeofday(&tv);
1426 ppid = task_tgid_vnr(current->real_parent);
1428 snprintf(buffer, tomoyo_buffer_len - 1,
1429 "#timestamp=%lu profile=%u mode=%s (global-pid=%u)"
1430 " task={ pid=%u ppid=%u uid=%u gid=%u euid=%u"
1431 " egid=%u suid=%u sgid=%u fsuid=%u fsgid=%u }",
1432 tv.tv_sec, r->profile, tomoyo_mode[r->mode], gpid,
1433 task_tgid_vnr(current), ppid,
1434 current_uid(), current_gid(), current_euid(),
1435 current_egid(), current_suid(), current_sgid(),
1436 current_fsuid(), current_fsgid());
1441 * tomoyo_init_audit_log - Allocate buffer for audit logs.
1443 * @len: Required size.
1444 * @r: Pointer to "struct tomoyo_request_info".
1446 * Returns pointer to allocated memory.
1448 * The @len is updated to add the header lines' size on success.
1450 * This function uses kzalloc(), so caller must kfree() if this function
1451 * didn't return NULL.
1453 static char *tomoyo_init_audit_log(int *len, struct tomoyo_request_info *r)
1457 const char *domainname;
1459 r->domain = tomoyo_domain();
1460 domainname = r->domain->domainname->name;
1461 header = tomoyo_print_header(r);
1464 *len += strlen(domainname) + strlen(header) + 10;
1465 buf = kzalloc(*len, GFP_NOFS);
1467 snprintf(buf, (*len) - 1, "%s\n%s\n", header, domainname);
1472 /* Wait queue for tomoyo_query_list. */
1473 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1475 /* Lock for manipulating tomoyo_query_list. */
1476 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1478 /* Structure for query. */
1479 struct tomoyo_query {
1480 struct list_head list;
1483 unsigned int serial;
1488 /* The list for "struct tomoyo_query". */
1489 static LIST_HEAD(tomoyo_query_list);
1492 * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1495 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1498 * tomoyo_supervisor - Ask for the supervisor's decision.
1500 * @r: Pointer to "struct tomoyo_request_info".
1501 * @fmt: The printf()'s format string, followed by parameters.
1503 * Returns 0 if the supervisor decided to permit the access request which
1504 * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1505 * supervisor decided to retry the access request which violated the policy in
1506 * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1508 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
1514 static unsigned int tomoyo_serial;
1515 struct tomoyo_query *entry = NULL;
1516 bool quota_exceeded = false;
1520 case TOMOYO_CONFIG_LEARNING:
1521 if (!tomoyo_domain_quota_is_ok(r))
1523 va_start(args, fmt);
1524 len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 4;
1526 buffer = kmalloc(len, GFP_NOFS);
1529 va_start(args, fmt);
1530 vsnprintf(buffer, len - 1, fmt, args);
1532 tomoyo_normalize_line(buffer);
1533 tomoyo_write_domain2(buffer, r->domain, false);
1536 case TOMOYO_CONFIG_PERMISSIVE:
1540 r->domain = tomoyo_domain();
1541 if (!atomic_read(&tomoyo_query_observers))
1543 va_start(args, fmt);
1544 len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 32;
1546 header = tomoyo_init_audit_log(&len, r);
1549 entry = kzalloc(sizeof(*entry), GFP_NOFS);
1552 entry->query = kzalloc(len, GFP_NOFS);
1555 len = ksize(entry->query);
1556 spin_lock(&tomoyo_query_list_lock);
1557 if (tomoyo_quota_for_query && tomoyo_query_memory_size + len +
1558 sizeof(*entry) >= tomoyo_quota_for_query) {
1559 quota_exceeded = true;
1561 tomoyo_query_memory_size += len + sizeof(*entry);
1562 entry->serial = tomoyo_serial++;
1564 spin_unlock(&tomoyo_query_list_lock);
1567 pos = snprintf(entry->query, len - 1, "Q%u-%hu\n%s",
1568 entry->serial, r->retry, header);
1571 va_start(args, fmt);
1572 vsnprintf(entry->query + pos, len - 1 - pos, fmt, args);
1573 entry->query_len = strlen(entry->query) + 1;
1575 spin_lock(&tomoyo_query_list_lock);
1576 list_add_tail(&entry->list, &tomoyo_query_list);
1577 spin_unlock(&tomoyo_query_list_lock);
1578 /* Give 10 seconds for supervisor's opinion. */
1579 for (entry->timer = 0;
1580 atomic_read(&tomoyo_query_observers) && entry->timer < 100;
1582 wake_up(&tomoyo_query_wait);
1583 set_current_state(TASK_INTERRUPTIBLE);
1584 schedule_timeout(HZ / 10);
1588 spin_lock(&tomoyo_query_list_lock);
1589 list_del(&entry->list);
1590 tomoyo_query_memory_size -= len + sizeof(*entry);
1591 spin_unlock(&tomoyo_query_list_lock);
1592 switch (entry->answer) {
1593 case 3: /* Asked to retry by administrator. */
1594 error = TOMOYO_RETRY_REQUEST;
1598 /* Granted by administrator. */
1605 /* Rejected by administrator. */
1610 kfree(entry->query);
1617 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
1619 * @file: Pointer to "struct file".
1620 * @wait: Pointer to "poll_table".
1622 * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
1624 * Waits for access requests which violated policy in enforcing mode.
1626 static int tomoyo_poll_query(struct file *file, poll_table *wait)
1628 struct list_head *tmp;
1631 for (i = 0; i < 2; i++) {
1632 spin_lock(&tomoyo_query_list_lock);
1633 list_for_each(tmp, &tomoyo_query_list) {
1634 struct tomoyo_query *ptr =
1635 list_entry(tmp, typeof(*ptr), list);
1641 spin_unlock(&tomoyo_query_list_lock);
1643 return POLLIN | POLLRDNORM;
1646 poll_wait(file, &tomoyo_query_wait, wait);
1652 * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
1654 * @head: Pointer to "struct tomoyo_io_buffer".
1656 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
1658 struct list_head *tmp;
1664 if (head->read_buf) {
1665 kfree(head->read_buf);
1666 head->read_buf = NULL;
1668 spin_lock(&tomoyo_query_list_lock);
1669 list_for_each(tmp, &tomoyo_query_list) {
1670 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
1673 if (pos++ != head->r.query_index)
1675 len = ptr->query_len;
1678 spin_unlock(&tomoyo_query_list_lock);
1680 head->r.query_index = 0;
1683 buf = kzalloc(len, GFP_NOFS);
1687 spin_lock(&tomoyo_query_list_lock);
1688 list_for_each(tmp, &tomoyo_query_list) {
1689 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
1692 if (pos++ != head->r.query_index)
1695 * Some query can be skipped because tomoyo_query_list
1696 * can change, but I don't care.
1698 if (len == ptr->query_len)
1699 memmove(buf, ptr->query, len);
1702 spin_unlock(&tomoyo_query_list_lock);
1704 head->read_buf = buf;
1705 head->r.w[head->r.w_pos++] = buf;
1706 head->r.query_index++;
1713 * tomoyo_write_answer - Write the supervisor's decision.
1715 * @head: Pointer to "struct tomoyo_io_buffer".
1717 * Returns 0 on success, -EINVAL otherwise.
1719 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
1721 char *data = head->write_buf;
1722 struct list_head *tmp;
1723 unsigned int serial;
1724 unsigned int answer;
1725 spin_lock(&tomoyo_query_list_lock);
1726 list_for_each(tmp, &tomoyo_query_list) {
1727 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
1730 spin_unlock(&tomoyo_query_list_lock);
1731 if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
1733 spin_lock(&tomoyo_query_list_lock);
1734 list_for_each(tmp, &tomoyo_query_list) {
1735 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
1736 if (ptr->serial != serial)
1739 ptr->answer = answer;
1742 spin_unlock(&tomoyo_query_list_lock);
1747 * tomoyo_read_version: Get version.
1749 * @head: Pointer to "struct tomoyo_io_buffer".
1751 * Returns version information.
1753 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
1756 tomoyo_io_printf(head, "2.3.0");
1762 * tomoyo_read_self_domain - Get the current process's domainname.
1764 * @head: Pointer to "struct tomoyo_io_buffer".
1766 * Returns the current process's domainname.
1768 static void tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
1772 * tomoyo_domain()->domainname != NULL
1773 * because every process belongs to a domain and
1774 * the domain's name cannot be NULL.
1776 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name);
1782 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
1784 * @type: Type of interface.
1785 * @file: Pointer to "struct file".
1787 * Associates policy handler and returns 0 on success, -ENOMEM otherwise.
1789 * Caller acquires tomoyo_read_lock().
1791 int tomoyo_open_control(const u8 type, struct file *file)
1793 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
1797 mutex_init(&head->io_sem);
1800 case TOMOYO_DOMAINPOLICY:
1801 /* /sys/kernel/security/tomoyo/domain_policy */
1802 head->write = tomoyo_write_domain;
1803 head->read = tomoyo_read_domain;
1805 case TOMOYO_EXCEPTIONPOLICY:
1806 /* /sys/kernel/security/tomoyo/exception_policy */
1807 head->write = tomoyo_write_exception;
1808 head->read = tomoyo_read_exception;
1810 case TOMOYO_SELFDOMAIN:
1811 /* /sys/kernel/security/tomoyo/self_domain */
1812 head->read = tomoyo_read_self_domain;
1814 case TOMOYO_DOMAIN_STATUS:
1815 /* /sys/kernel/security/tomoyo/.domain_status */
1816 head->write = tomoyo_write_domain_profile;
1817 head->read = tomoyo_read_domain_profile;
1819 case TOMOYO_PROCESS_STATUS:
1820 /* /sys/kernel/security/tomoyo/.process_status */
1821 head->write = tomoyo_write_pid;
1822 head->read = tomoyo_read_pid;
1824 case TOMOYO_VERSION:
1825 /* /sys/kernel/security/tomoyo/version */
1826 head->read = tomoyo_read_version;
1827 head->readbuf_size = 128;
1829 case TOMOYO_MEMINFO:
1830 /* /sys/kernel/security/tomoyo/meminfo */
1831 head->write = tomoyo_write_memory_quota;
1832 head->read = tomoyo_read_memory_counter;
1833 head->readbuf_size = 512;
1835 case TOMOYO_PROFILE:
1836 /* /sys/kernel/security/tomoyo/profile */
1837 head->write = tomoyo_write_profile;
1838 head->read = tomoyo_read_profile;
1840 case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
1841 head->poll = tomoyo_poll_query;
1842 head->write = tomoyo_write_answer;
1843 head->read = tomoyo_read_query;
1845 case TOMOYO_MANAGER:
1846 /* /sys/kernel/security/tomoyo/manager */
1847 head->write = tomoyo_write_manager;
1848 head->read = tomoyo_read_manager;
1851 if (!(file->f_mode & FMODE_READ)) {
1853 * No need to allocate read_buf since it is not opened
1858 } else if (!head->poll) {
1859 /* Don't allocate read_buf for poll() access. */
1860 if (!head->readbuf_size)
1861 head->readbuf_size = 4096 * 2;
1862 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
1863 if (!head->read_buf) {
1868 if (!(file->f_mode & FMODE_WRITE)) {
1870 * No need to allocate write_buf since it is not opened
1874 } else if (head->write) {
1875 head->writebuf_size = 4096 * 2;
1876 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
1877 if (!head->write_buf) {
1878 kfree(head->read_buf);
1883 if (type != TOMOYO_QUERY)
1884 head->reader_idx = tomoyo_read_lock();
1885 file->private_data = head;
1887 * Call the handler now if the file is
1888 * /sys/kernel/security/tomoyo/self_domain
1889 * so that the user can use
1890 * cat < /sys/kernel/security/tomoyo/self_domain"
1891 * to know the current process's domainname.
1893 if (type == TOMOYO_SELFDOMAIN)
1894 tomoyo_read_control(file, NULL, 0);
1896 * If the file is /sys/kernel/security/tomoyo/query , increment the
1898 * The obserber counter is used by tomoyo_supervisor() to see if
1899 * there is some process monitoring /sys/kernel/security/tomoyo/query.
1901 else if (type == TOMOYO_QUERY)
1902 atomic_inc(&tomoyo_query_observers);
1907 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
1909 * @file: Pointer to "struct file".
1910 * @wait: Pointer to "poll_table".
1912 * Waits for read readiness.
1913 * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd .
1915 int tomoyo_poll_control(struct file *file, poll_table *wait)
1917 struct tomoyo_io_buffer *head = file->private_data;
1920 return head->poll(file, wait);
1924 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
1926 * @file: Pointer to "struct file".
1927 * @buffer: Poiner to buffer to write to.
1928 * @buffer_len: Size of @buffer.
1930 * Returns bytes read on success, negative value otherwise.
1932 * Caller holds tomoyo_read_lock().
1934 int tomoyo_read_control(struct file *file, char __user *buffer,
1935 const int buffer_len)
1938 struct tomoyo_io_buffer *head = file->private_data;
1942 if (mutex_lock_interruptible(&head->io_sem))
1944 head->read_user_buf = buffer;
1945 head->read_user_buf_avail = buffer_len;
1946 if (tomoyo_flush(head))
1947 /* Call the policy handler. */
1950 len = head->read_user_buf - buffer;
1951 mutex_unlock(&head->io_sem);
1956 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
1958 * @file: Pointer to "struct file".
1959 * @buffer: Pointer to buffer to read from.
1960 * @buffer_len: Size of @buffer.
1962 * Returns @buffer_len on success, negative value otherwise.
1964 * Caller holds tomoyo_read_lock().
1966 int tomoyo_write_control(struct file *file, const char __user *buffer,
1967 const int buffer_len)
1969 struct tomoyo_io_buffer *head = file->private_data;
1970 int error = buffer_len;
1971 int avail_len = buffer_len;
1972 char *cp0 = head->write_buf;
1976 if (!access_ok(VERIFY_READ, buffer, buffer_len))
1978 /* Don't allow updating policies by non manager programs. */
1979 if (head->write != tomoyo_write_pid &&
1980 head->write != tomoyo_write_domain && !tomoyo_manager())
1982 if (mutex_lock_interruptible(&head->io_sem))
1984 /* Read a line and dispatch it to the policy handler. */
1985 while (avail_len > 0) {
1987 if (head->write_avail >= head->writebuf_size - 1) {
1990 } else if (get_user(c, buffer)) {
1996 cp0[head->write_avail++] = c;
1999 cp0[head->write_avail - 1] = '\0';
2000 head->write_avail = 0;
2001 tomoyo_normalize_line(cp0);
2004 mutex_unlock(&head->io_sem);
2009 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
2011 * @file: Pointer to "struct file".
2013 * Releases memory and returns 0.
2015 * Caller looses tomoyo_read_lock().
2017 int tomoyo_close_control(struct file *file)
2019 struct tomoyo_io_buffer *head = file->private_data;
2020 const bool is_write = !!head->write_buf;
2023 * If the file is /sys/kernel/security/tomoyo/query , decrement the
2026 if (head->type == TOMOYO_QUERY)
2027 atomic_dec(&tomoyo_query_observers);
2029 tomoyo_read_unlock(head->reader_idx);
2030 /* Release memory used for policy I/O. */
2031 kfree(head->read_buf);
2032 head->read_buf = NULL;
2033 kfree(head->write_buf);
2034 head->write_buf = NULL;
2037 file->private_data = NULL;
2044 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
2046 void tomoyo_check_profile(void)
2048 struct tomoyo_domain_info *domain;
2049 const int idx = tomoyo_read_lock();
2050 tomoyo_policy_loaded = true;
2051 /* Check all profiles currently assigned to domains are defined. */
2052 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
2053 const u8 profile = domain->profile;
2054 if (tomoyo_profile_ptr[profile])
2056 printk(KERN_ERR "You need to define profile %u before using it.\n",
2058 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.3/ "
2059 "for more information.\n");
2060 panic("Profile %u (used by '%s') not defined.\n",
2061 profile, domain->domainname->name);
2063 tomoyo_read_unlock(idx);
2064 if (tomoyo_profile_version != 20090903) {
2065 printk(KERN_ERR "You need to install userland programs for "
2066 "TOMOYO 2.3 and initialize policy configuration.\n");
2067 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.3/ "
2068 "for more information.\n");
2069 panic("Profile version %u is not supported.\n",
2070 tomoyo_profile_version);
2072 printk(KERN_INFO "TOMOYO: 2.3.0\n");
2073 printk(KERN_INFO "Mandatory Access Control activated.\n");