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_GETATTR] = "file::getattr",
43 [TOMOYO_MAC_FILE_MKDIR] = "file::mkdir",
44 [TOMOYO_MAC_FILE_RMDIR] = "file::rmdir",
45 [TOMOYO_MAC_FILE_MKFIFO] = "file::mkfifo",
46 [TOMOYO_MAC_FILE_MKSOCK] = "file::mksock",
47 [TOMOYO_MAC_FILE_TRUNCATE] = "file::truncate",
48 [TOMOYO_MAC_FILE_SYMLINK] = "file::symlink",
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;
114 /* Add '\0' for query. */
116 if (!head->read_user_buf_avail ||
117 copy_to_user(head->read_user_buf, "", 1))
119 head->read_user_buf_avail--;
120 head->read_user_buf++;
123 for (len = 0; len < head->r.w_pos; len++)
124 head->r.w[len] = head->r.w[len + 1];
131 * tomoyo_set_string - Queue string to "struct tomoyo_io_buffer" structure.
133 * @head: Pointer to "struct tomoyo_io_buffer".
134 * @string: String to print.
136 * Note that @string has to be kept valid until @head is kfree()d.
137 * This means that char[] allocated on stack memory cannot be passed to
138 * this function. Use tomoyo_io_printf() for char[] allocated on stack memory.
140 static void tomoyo_set_string(struct tomoyo_io_buffer *head, const char *string)
142 if (head->r.w_pos < TOMOYO_MAX_IO_READ_QUEUE) {
143 head->r.w[head->r.w_pos++] = string;
150 * tomoyo_io_printf - printf() to "struct tomoyo_io_buffer" structure.
152 * @head: Pointer to "struct tomoyo_io_buffer".
153 * @fmt: The printf()'s format string, followed by parameters.
155 void tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
159 int pos = head->r.avail;
160 int size = head->readbuf_size - pos;
164 len = vsnprintf(head->read_buf + pos, size, fmt, args) + 1;
166 if (pos + len >= head->readbuf_size) {
170 head->r.avail += len;
171 tomoyo_set_string(head, head->read_buf + pos);
174 static void tomoyo_set_space(struct tomoyo_io_buffer *head)
176 tomoyo_set_string(head, " ");
179 static bool tomoyo_set_lf(struct tomoyo_io_buffer *head)
181 tomoyo_set_string(head, "\n");
182 return !head->r.w_pos;
186 * tomoyo_print_name_union - Print a tomoyo_name_union.
188 * @head: Pointer to "struct tomoyo_io_buffer".
189 * @ptr: Pointer to "struct tomoyo_name_union".
191 static void tomoyo_print_name_union(struct tomoyo_io_buffer *head,
192 const struct tomoyo_name_union *ptr)
194 tomoyo_set_space(head);
196 tomoyo_set_string(head, "@");
197 tomoyo_set_string(head, ptr->group->group_name->name);
199 tomoyo_set_string(head, ptr->filename->name);
204 * tomoyo_print_number_union - Print a tomoyo_number_union.
206 * @head: Pointer to "struct tomoyo_io_buffer".
207 * @ptr: Pointer to "struct tomoyo_number_union".
209 static void tomoyo_print_number_union(struct tomoyo_io_buffer *head,
210 const struct tomoyo_number_union *ptr)
212 tomoyo_set_space(head);
214 tomoyo_set_string(head, "@");
215 tomoyo_set_string(head, ptr->group->group_name->name);
218 unsigned long min = ptr->values[0];
219 const unsigned long max = ptr->values[1];
220 u8 min_type = ptr->value_type[0];
221 const u8 max_type = ptr->value_type[1];
224 for (i = 0; i < 2; i++) {
226 case TOMOYO_VALUE_TYPE_HEXADECIMAL:
227 tomoyo_addprintf(buffer, sizeof(buffer),
230 case TOMOYO_VALUE_TYPE_OCTAL:
231 tomoyo_addprintf(buffer, sizeof(buffer),
235 tomoyo_addprintf(buffer, sizeof(buffer),
239 if (min == max && min_type == max_type)
241 tomoyo_addprintf(buffer, sizeof(buffer), "-");
245 tomoyo_io_printf(head, "%s", buffer);
250 * tomoyo_assign_profile - Create a new profile.
252 * @profile: Profile number to create.
254 * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
256 static struct tomoyo_profile *tomoyo_assign_profile(const unsigned int profile)
258 struct tomoyo_profile *ptr;
259 struct tomoyo_profile *entry;
260 if (profile >= TOMOYO_MAX_PROFILES)
262 ptr = tomoyo_profile_ptr[profile];
265 entry = kzalloc(sizeof(*entry), GFP_NOFS);
266 if (mutex_lock_interruptible(&tomoyo_policy_lock))
268 ptr = tomoyo_profile_ptr[profile];
269 if (!ptr && tomoyo_memory_ok(entry)) {
271 ptr->learning = &tomoyo_default_profile.preference;
272 ptr->permissive = &tomoyo_default_profile.preference;
273 ptr->enforcing = &tomoyo_default_profile.preference;
274 ptr->default_config = TOMOYO_CONFIG_DISABLED;
275 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
276 sizeof(ptr->config));
277 mb(); /* Avoid out-of-order execution. */
278 tomoyo_profile_ptr[profile] = ptr;
281 mutex_unlock(&tomoyo_policy_lock);
288 * tomoyo_profile - Find a profile.
290 * @profile: Profile number to find.
292 * Returns pointer to "struct tomoyo_profile".
294 struct tomoyo_profile *tomoyo_profile(const u8 profile)
296 struct tomoyo_profile *ptr = tomoyo_profile_ptr[profile];
297 if (!tomoyo_policy_loaded)
298 return &tomoyo_default_profile;
303 static s8 tomoyo_find_yesno(const char *string, const char *find)
305 const char *cp = strstr(string, find);
308 if (!strncmp(cp, "=yes", 4))
310 else if (!strncmp(cp, "=no", 3))
316 static void tomoyo_set_bool(bool *b, const char *string, const char *find)
318 switch (tomoyo_find_yesno(string, find)) {
328 static void tomoyo_set_uint(unsigned int *i, const char *string,
331 const char *cp = strstr(string, find);
333 sscanf(cp + strlen(find), "=%u", i);
336 static void tomoyo_set_pref(const char *name, const char *value,
337 const bool use_default,
338 struct tomoyo_profile *profile)
340 struct tomoyo_preference **pref;
342 if (!strcmp(name, "enforcing")) {
344 pref = &profile->enforcing;
347 profile->enforcing = &profile->preference;
348 verbose = &profile->preference.enforcing_verbose;
351 if (!strcmp(name, "permissive")) {
353 pref = &profile->permissive;
356 profile->permissive = &profile->preference;
357 verbose = &profile->preference.permissive_verbose;
360 if (!strcmp(name, "learning")) {
362 pref = &profile->learning;
365 profile->learning = &profile->preference;
366 tomoyo_set_uint(&profile->preference.learning_max_entry, value,
368 verbose = &profile->preference.learning_verbose;
373 *pref = &tomoyo_default_profile.preference;
376 tomoyo_set_bool(verbose, value, "verbose");
379 static int tomoyo_set_mode(char *name, const char *value,
380 const bool use_default,
381 struct tomoyo_profile *profile)
385 if (!strcmp(name, "CONFIG")) {
386 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
387 config = profile->default_config;
388 } else if (tomoyo_str_starts(&name, "CONFIG::")) {
390 for (i = 0; i < TOMOYO_MAX_MAC_INDEX
391 + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
392 if (strcmp(name, tomoyo_mac_keywords[i]))
394 config = profile->config[i];
397 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
403 config = TOMOYO_CONFIG_USE_DEFAULT;
406 for (mode = 0; mode < 4; mode++)
407 if (strstr(value, tomoyo_mode[mode]))
409 * Update lower 3 bits in order to distinguish
410 * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
412 config = (config & ~7) | mode;
414 if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
415 profile->config[i] = config;
416 else if (config != TOMOYO_CONFIG_USE_DEFAULT)
417 profile->default_config = config;
422 * tomoyo_write_profile - Write profile table.
424 * @head: Pointer to "struct tomoyo_io_buffer".
426 * Returns 0 on success, negative value otherwise.
428 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
430 char *data = head->write_buf;
432 bool use_default = false;
434 struct tomoyo_profile *profile;
435 if (sscanf(data, "PROFILE_VERSION=%u", &tomoyo_profile_version) == 1)
437 i = simple_strtoul(data, &cp, 10);
439 profile = &tomoyo_default_profile;
444 profile = tomoyo_assign_profile(i);
448 cp = strchr(data, '=');
452 if (profile != &tomoyo_default_profile)
453 use_default = strstr(cp, "use_default") != NULL;
454 if (tomoyo_str_starts(&data, "PREFERENCE::")) {
455 tomoyo_set_pref(data, cp, use_default, profile);
458 if (profile == &tomoyo_default_profile)
460 if (!strcmp(data, "COMMENT")) {
461 static DEFINE_SPINLOCK(lock);
462 const struct tomoyo_path_info *new_comment
463 = tomoyo_get_name(cp);
464 const struct tomoyo_path_info *old_comment;
468 old_comment = profile->comment;
469 profile->comment = new_comment;
471 tomoyo_put_name(old_comment);
474 return tomoyo_set_mode(data, cp, use_default, profile);
477 static void tomoyo_print_preference(struct tomoyo_io_buffer *head,
480 struct tomoyo_preference *pref = &tomoyo_default_profile.preference;
481 const struct tomoyo_profile *profile = idx >= 0 ?
482 tomoyo_profile_ptr[idx] : NULL;
483 char buffer[16] = "";
485 buffer[sizeof(buffer) - 1] = '\0';
486 snprintf(buffer, sizeof(buffer) - 1, "%u-", idx);
489 pref = profile->learning;
490 if (pref == &tomoyo_default_profile.preference)
493 tomoyo_io_printf(head, "%sPREFERENCE::%s={ "
494 "verbose=%s max_entry=%u }\n",
496 tomoyo_yesno(pref->learning_verbose),
497 pref->learning_max_entry);
500 pref = profile->permissive;
501 if (pref == &tomoyo_default_profile.preference)
504 tomoyo_io_printf(head, "%sPREFERENCE::%s={ verbose=%s }\n",
505 buffer, "permissive",
506 tomoyo_yesno(pref->permissive_verbose));
509 pref = profile->enforcing;
510 if (pref == &tomoyo_default_profile.preference)
513 tomoyo_io_printf(head, "%sPREFERENCE::%s={ verbose=%s }\n",
515 tomoyo_yesno(pref->enforcing_verbose));
518 static void tomoyo_print_config(struct tomoyo_io_buffer *head, const u8 config)
520 tomoyo_io_printf(head, "={ mode=%s }\n", tomoyo_mode[config & 3]);
524 * tomoyo_read_profile - Read profile table.
526 * @head: Pointer to "struct tomoyo_io_buffer".
528 static void tomoyo_read_profile(struct tomoyo_io_buffer *head)
531 const struct tomoyo_profile *profile;
533 index = head->r.index;
534 profile = tomoyo_profile_ptr[index];
535 switch (head->r.step) {
537 tomoyo_io_printf(head, "PROFILE_VERSION=%s\n", "20090903");
538 tomoyo_print_preference(head, -1);
542 for ( ; head->r.index < TOMOYO_MAX_PROFILES;
544 if (tomoyo_profile_ptr[head->r.index])
546 if (head->r.index == TOMOYO_MAX_PROFILES)
552 const struct tomoyo_path_info *comment =
554 tomoyo_io_printf(head, "%u-COMMENT=", index);
555 tomoyo_set_string(head, comment ? comment->name : "");
562 tomoyo_io_printf(head, "%u-%s", index, "CONFIG");
563 tomoyo_print_config(head, profile->default_config);
569 for ( ; head->r.bit < TOMOYO_MAX_MAC_INDEX
570 + TOMOYO_MAX_MAC_CATEGORY_INDEX; head->r.bit++) {
571 const u8 i = head->r.bit;
572 const u8 config = profile->config[i];
573 if (config == TOMOYO_CONFIG_USE_DEFAULT)
575 tomoyo_io_printf(head, "%u-%s%s", index, "CONFIG::",
576 tomoyo_mac_keywords[i]);
577 tomoyo_print_config(head, config);
581 if (head->r.bit == TOMOYO_MAX_MAC_INDEX
582 + TOMOYO_MAX_MAC_CATEGORY_INDEX) {
583 tomoyo_print_preference(head, index);
589 if (tomoyo_flush(head))
593 static bool tomoyo_same_manager(const struct tomoyo_acl_head *a,
594 const struct tomoyo_acl_head *b)
596 return container_of(a, struct tomoyo_manager, head)->manager ==
597 container_of(b, struct tomoyo_manager, head)->manager;
601 * tomoyo_update_manager_entry - Add a manager entry.
603 * @manager: The path to manager or the domainnamme.
604 * @is_delete: True if it is a delete request.
606 * Returns 0 on success, negative value otherwise.
608 * Caller holds tomoyo_read_lock().
610 static int tomoyo_update_manager_entry(const char *manager,
611 const bool is_delete)
613 struct tomoyo_manager e = { };
616 if (tomoyo_domain_def(manager)) {
617 if (!tomoyo_correct_domain(manager))
621 if (!tomoyo_correct_path(manager))
624 e.manager = tomoyo_get_name(manager);
627 error = tomoyo_update_policy(&e.head, sizeof(e), is_delete,
628 &tomoyo_policy_list[TOMOYO_ID_MANAGER],
629 tomoyo_same_manager);
630 tomoyo_put_name(e.manager);
635 * tomoyo_write_manager - Write manager policy.
637 * @head: Pointer to "struct tomoyo_io_buffer".
639 * Returns 0 on success, negative value otherwise.
641 * Caller holds tomoyo_read_lock().
643 static int tomoyo_write_manager(struct tomoyo_io_buffer *head)
645 char *data = head->write_buf;
646 bool is_delete = tomoyo_str_starts(&data, "delete ");
648 if (!strcmp(data, "manage_by_non_root")) {
649 tomoyo_manage_by_non_root = !is_delete;
652 return tomoyo_update_manager_entry(data, is_delete);
656 * tomoyo_read_manager - Read manager policy.
658 * @head: Pointer to "struct tomoyo_io_buffer".
660 * Caller holds tomoyo_read_lock().
662 static void tomoyo_read_manager(struct tomoyo_io_buffer *head)
666 list_for_each_cookie(head->r.acl,
667 &tomoyo_policy_list[TOMOYO_ID_MANAGER]) {
668 struct tomoyo_manager *ptr =
669 list_entry(head->r.acl, typeof(*ptr), head.list);
670 if (ptr->head.is_deleted)
672 if (!tomoyo_flush(head))
674 tomoyo_set_string(head, ptr->manager->name);
681 * tomoyo_manager - Check whether the current process is a policy manager.
683 * Returns true if the current process is permitted to modify policy
684 * via /sys/kernel/security/tomoyo/ interface.
686 * Caller holds tomoyo_read_lock().
688 static bool tomoyo_manager(void)
690 struct tomoyo_manager *ptr;
692 const struct task_struct *task = current;
693 const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
696 if (!tomoyo_policy_loaded)
698 if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
700 list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_MANAGER],
702 if (!ptr->head.is_deleted && ptr->is_domain
703 && !tomoyo_pathcmp(domainname, ptr->manager)) {
710 exe = tomoyo_get_exe();
713 list_for_each_entry_rcu(ptr, &tomoyo_policy_list[TOMOYO_ID_MANAGER],
715 if (!ptr->head.is_deleted && !ptr->is_domain
716 && !strcmp(exe, ptr->manager->name)) {
721 if (!found) { /* Reduce error messages. */
722 static pid_t last_pid;
723 const pid_t pid = current->pid;
724 if (last_pid != pid) {
725 printk(KERN_WARNING "%s ( %s ) is not permitted to "
726 "update policies.\n", domainname->name, exe);
735 * tomoyo_select_one - Parse select command.
737 * @head: Pointer to "struct tomoyo_io_buffer".
738 * @data: String to parse.
740 * Returns true on success, false otherwise.
742 * Caller holds tomoyo_read_lock().
744 static bool tomoyo_select_one(struct tomoyo_io_buffer *head, const char *data)
747 struct tomoyo_domain_info *domain = NULL;
748 bool global_pid = false;
750 if (!strcmp(data, "allow_execute")) {
751 head->r.print_execute_only = true;
754 if (sscanf(data, "pid=%u", &pid) == 1 ||
755 (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
756 struct task_struct *p;
758 read_lock(&tasklist_lock);
760 p = find_task_by_pid_ns(pid, &init_pid_ns);
762 p = find_task_by_vpid(pid);
764 domain = tomoyo_real_domain(p);
765 read_unlock(&tasklist_lock);
767 } else if (!strncmp(data, "domain=", 7)) {
768 if (tomoyo_domain_def(data + 7))
769 domain = tomoyo_find_domain(data + 7);
772 head->w.domain = domain;
773 /* Accessing read_buf is safe because head->io_sem is held. */
775 return true; /* Do nothing if open(O_WRONLY). */
776 memset(&head->r, 0, sizeof(head->r));
777 head->r.print_this_domain_only = true;
779 head->r.domain = &domain->list;
782 tomoyo_io_printf(head, "# select %s\n", data);
783 if (domain && domain->is_deleted)
784 tomoyo_io_printf(head, "# This is a deleted domain.\n");
789 * tomoyo_delete_domain - Delete a domain.
791 * @domainname: The name of domain.
795 * Caller holds tomoyo_read_lock().
797 static int tomoyo_delete_domain(char *domainname)
799 struct tomoyo_domain_info *domain;
800 struct tomoyo_path_info name;
802 name.name = domainname;
803 tomoyo_fill_path_info(&name);
804 if (mutex_lock_interruptible(&tomoyo_policy_lock))
806 /* Is there an active domain? */
807 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
808 /* Never delete tomoyo_kernel_domain */
809 if (domain == &tomoyo_kernel_domain)
811 if (domain->is_deleted ||
812 tomoyo_pathcmp(domain->domainname, &name))
814 domain->is_deleted = true;
817 mutex_unlock(&tomoyo_policy_lock);
822 * tomoyo_write_domain2 - Write domain policy.
824 * @head: Pointer to "struct tomoyo_io_buffer".
826 * Returns 0 on success, negative value otherwise.
828 * Caller holds tomoyo_read_lock().
830 static int tomoyo_write_domain2(char *data, struct tomoyo_domain_info *domain,
831 const bool is_delete)
833 if (tomoyo_str_starts(&data, "allow_mount "))
834 return tomoyo_write_mount(data, domain, is_delete);
835 return tomoyo_write_file(data, domain, is_delete);
839 * tomoyo_write_domain - Write domain policy.
841 * @head: Pointer to "struct tomoyo_io_buffer".
843 * Returns 0 on success, negative value otherwise.
845 * Caller holds tomoyo_read_lock().
847 static int tomoyo_write_domain(struct tomoyo_io_buffer *head)
849 char *data = head->write_buf;
850 struct tomoyo_domain_info *domain = head->w.domain;
851 bool is_delete = false;
852 bool is_select = false;
853 unsigned int profile;
855 if (tomoyo_str_starts(&data, "delete "))
857 else if (tomoyo_str_starts(&data, "select "))
859 if (is_select && tomoyo_select_one(head, data))
861 /* Don't allow updating policies by non manager programs. */
862 if (!tomoyo_manager())
864 if (tomoyo_domain_def(data)) {
867 tomoyo_delete_domain(data);
869 domain = tomoyo_find_domain(data);
871 domain = tomoyo_assign_domain(data, 0);
872 head->w.domain = domain;
878 if (sscanf(data, "use_profile %u", &profile) == 1
879 && profile < TOMOYO_MAX_PROFILES) {
880 if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)
881 domain->profile = (u8) profile;
884 if (!strcmp(data, "quota_exceeded")) {
885 domain->quota_warned = !is_delete;
888 if (!strcmp(data, "transition_failed")) {
889 domain->transition_failed = !is_delete;
892 return tomoyo_write_domain2(data, domain, is_delete);
896 * tomoyo_fns - Find next set bit.
898 * @perm: 8 bits value.
899 * @bit: First bit to find.
901 * Returns next on-bit on success, 8 otherwise.
903 static u8 tomoyo_fns(const u8 perm, u8 bit)
905 for ( ; bit < 8; bit++)
906 if (perm & (1 << bit))
912 * tomoyo_print_entry - Print an ACL entry.
914 * @head: Pointer to "struct tomoyo_io_buffer".
915 * @acl: Pointer to an ACL entry.
917 * Returns true on success, false otherwise.
919 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
920 struct tomoyo_acl_info *acl)
922 const u8 acl_type = acl->type;
929 if (!tomoyo_flush(head))
931 else if (acl_type == TOMOYO_TYPE_PATH_ACL) {
932 struct tomoyo_path_acl *ptr =
933 container_of(acl, typeof(*ptr), head);
934 const u16 perm = ptr->perm;
935 for ( ; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
936 if (!(perm & (1 << bit)))
938 if (head->r.print_execute_only &&
939 bit != TOMOYO_TYPE_EXECUTE)
943 if (bit >= TOMOYO_MAX_PATH_OPERATION)
945 tomoyo_io_printf(head, "allow_%s", tomoyo_path_keyword[bit]);
946 tomoyo_print_name_union(head, &ptr->name);
947 } else if (head->r.print_execute_only) {
949 } else if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
950 struct tomoyo_path2_acl *ptr =
951 container_of(acl, typeof(*ptr), head);
952 bit = tomoyo_fns(ptr->perm, bit);
953 if (bit >= TOMOYO_MAX_PATH2_OPERATION)
955 tomoyo_io_printf(head, "allow_%s", tomoyo_path2_keyword[bit]);
956 tomoyo_print_name_union(head, &ptr->name1);
957 tomoyo_print_name_union(head, &ptr->name2);
958 } else if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
959 struct tomoyo_path_number_acl *ptr =
960 container_of(acl, typeof(*ptr), head);
961 bit = tomoyo_fns(ptr->perm, bit);
962 if (bit >= TOMOYO_MAX_PATH_NUMBER_OPERATION)
964 tomoyo_io_printf(head, "allow_%s",
965 tomoyo_path_number_keyword[bit]);
966 tomoyo_print_name_union(head, &ptr->name);
967 tomoyo_print_number_union(head, &ptr->number);
968 } else if (acl_type == TOMOYO_TYPE_MKDEV_ACL) {
969 struct tomoyo_mkdev_acl *ptr =
970 container_of(acl, typeof(*ptr), head);
971 bit = tomoyo_fns(ptr->perm, bit);
972 if (bit >= TOMOYO_MAX_MKDEV_OPERATION)
974 tomoyo_io_printf(head, "allow_%s", tomoyo_mkdev_keyword[bit]);
975 tomoyo_print_name_union(head, &ptr->name);
976 tomoyo_print_number_union(head, &ptr->mode);
977 tomoyo_print_number_union(head, &ptr->major);
978 tomoyo_print_number_union(head, &ptr->minor);
979 } else if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
980 struct tomoyo_mount_acl *ptr =
981 container_of(acl, typeof(*ptr), head);
982 tomoyo_io_printf(head, "allow_mount");
983 tomoyo_print_name_union(head, &ptr->dev_name);
984 tomoyo_print_name_union(head, &ptr->dir_name);
985 tomoyo_print_name_union(head, &ptr->fs_type);
986 tomoyo_print_number_union(head, &ptr->flags);
988 head->r.bit = bit + 1;
989 tomoyo_io_printf(head, "\n");
990 if (acl_type != TOMOYO_TYPE_MOUNT_ACL)
998 * tomoyo_read_domain2 - Read domain policy.
1000 * @head: Pointer to "struct tomoyo_io_buffer".
1001 * @domain: Pointer to "struct tomoyo_domain_info".
1003 * Caller holds tomoyo_read_lock().
1005 * Returns true on success, false otherwise.
1007 static bool tomoyo_read_domain2(struct tomoyo_io_buffer *head,
1008 struct tomoyo_domain_info *domain)
1010 list_for_each_cookie(head->r.acl, &domain->acl_info_list) {
1011 struct tomoyo_acl_info *ptr =
1012 list_entry(head->r.acl, typeof(*ptr), list);
1013 if (!tomoyo_print_entry(head, ptr))
1021 * tomoyo_read_domain - Read domain policy.
1023 * @head: Pointer to "struct tomoyo_io_buffer".
1025 * Caller holds tomoyo_read_lock().
1027 static void tomoyo_read_domain(struct tomoyo_io_buffer *head)
1031 list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1032 struct tomoyo_domain_info *domain =
1033 list_entry(head->r.domain, typeof(*domain), list);
1034 switch (head->r.step) {
1036 if (domain->is_deleted &&
1037 !head->r.print_this_domain_only)
1039 /* Print domainname and flags. */
1040 tomoyo_set_string(head, domain->domainname->name);
1041 tomoyo_set_lf(head);
1042 tomoyo_io_printf(head, "use_profile %u\n",
1044 if (domain->quota_warned)
1045 tomoyo_set_string(head, "quota_exceeded\n");
1046 if (domain->transition_failed)
1047 tomoyo_set_string(head, "transition_failed\n");
1049 tomoyo_set_lf(head);
1052 if (!tomoyo_read_domain2(head, domain))
1055 if (!tomoyo_set_lf(head))
1060 if (head->r.print_this_domain_only)
1069 * tomoyo_write_domain_profile - Assign profile for specified domain.
1071 * @head: Pointer to "struct tomoyo_io_buffer".
1073 * Returns 0 on success, -EINVAL otherwise.
1075 * This is equivalent to doing
1077 * ( echo "select " $domainname; echo "use_profile " $profile ) |
1078 * /usr/sbin/tomoyo-loadpolicy -d
1080 * Caller holds tomoyo_read_lock().
1082 static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head)
1084 char *data = head->write_buf;
1085 char *cp = strchr(data, ' ');
1086 struct tomoyo_domain_info *domain;
1087 unsigned long profile;
1092 domain = tomoyo_find_domain(cp + 1);
1093 if (strict_strtoul(data, 10, &profile))
1095 if (domain && profile < TOMOYO_MAX_PROFILES
1096 && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded))
1097 domain->profile = (u8) profile;
1102 * tomoyo_read_domain_profile - Read only domainname and profile.
1104 * @head: Pointer to "struct tomoyo_io_buffer".
1106 * Returns list of profile number and domainname pairs.
1108 * This is equivalent to doing
1110 * grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy |
1111 * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" )
1112 * domainname = $0; } else if ( $1 == "use_profile" ) {
1113 * print $2 " " domainname; domainname = ""; } } ; '
1115 * Caller holds tomoyo_read_lock().
1117 static void tomoyo_read_domain_profile(struct tomoyo_io_buffer *head)
1121 list_for_each_cookie(head->r.domain, &tomoyo_domain_list) {
1122 struct tomoyo_domain_info *domain =
1123 list_entry(head->r.domain, typeof(*domain), list);
1124 if (domain->is_deleted)
1126 if (!tomoyo_flush(head))
1128 tomoyo_io_printf(head, "%u ", domain->profile);
1129 tomoyo_set_string(head, domain->domainname->name);
1130 tomoyo_set_lf(head);
1136 * tomoyo_write_pid: Specify PID to obtain domainname.
1138 * @head: Pointer to "struct tomoyo_io_buffer".
1142 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1144 head->r.eof = false;
1149 * tomoyo_read_pid - Get domainname of the specified PID.
1151 * @head: Pointer to "struct tomoyo_io_buffer".
1153 * Returns the domainname which the specified PID is in on success,
1154 * empty string otherwise.
1155 * The PID is specified by tomoyo_write_pid() so that the user can obtain
1156 * using read()/write() interface rather than sysctl() interface.
1158 static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
1160 char *buf = head->write_buf;
1161 bool global_pid = false;
1163 struct task_struct *p;
1164 struct tomoyo_domain_info *domain = NULL;
1166 /* Accessing write_buf is safe because head->io_sem is held. */
1169 return; /* Do nothing if open(O_RDONLY). */
1171 if (head->r.w_pos || head->r.eof)
1174 if (tomoyo_str_starts(&buf, "global-pid "))
1176 pid = (unsigned int) simple_strtoul(buf, NULL, 10);
1178 read_lock(&tasklist_lock);
1180 p = find_task_by_pid_ns(pid, &init_pid_ns);
1182 p = find_task_by_vpid(pid);
1184 domain = tomoyo_real_domain(p);
1185 read_unlock(&tasklist_lock);
1189 tomoyo_io_printf(head, "%u %u ", pid, domain->profile);
1190 tomoyo_set_string(head, domain->domainname->name);
1193 static const char *tomoyo_transition_type[TOMOYO_MAX_TRANSITION_TYPE] = {
1194 [TOMOYO_TRANSITION_CONTROL_NO_INITIALIZE] = "no_initialize_domain",
1195 [TOMOYO_TRANSITION_CONTROL_INITIALIZE] = "initialize_domain",
1196 [TOMOYO_TRANSITION_CONTROL_NO_KEEP] = "no_keep_domain",
1197 [TOMOYO_TRANSITION_CONTROL_KEEP] = "keep_domain",
1200 static const char *tomoyo_group_name[TOMOYO_MAX_GROUP] = {
1201 [TOMOYO_PATH_GROUP] = "path_group ",
1202 [TOMOYO_NUMBER_GROUP] = "number_group ",
1206 * tomoyo_write_exception - Write exception policy.
1208 * @head: Pointer to "struct tomoyo_io_buffer".
1210 * Returns 0 on success, negative value otherwise.
1212 * Caller holds tomoyo_read_lock().
1214 static int tomoyo_write_exception(struct tomoyo_io_buffer *head)
1216 char *data = head->write_buf;
1217 bool is_delete = tomoyo_str_starts(&data, "delete ");
1219 static const struct {
1220 const char *keyword;
1221 int (*write) (char *, const bool);
1222 } tomoyo_callback[1] = {
1223 { "aggregator ", tomoyo_write_aggregator },
1226 for (i = 0; i < TOMOYO_MAX_TRANSITION_TYPE; i++)
1227 if (tomoyo_str_starts(&data, tomoyo_transition_type[i]))
1228 return tomoyo_write_transition_control(data, is_delete,
1230 for (i = 0; i < 1; i++)
1231 if (tomoyo_str_starts(&data, tomoyo_callback[i].keyword))
1232 return tomoyo_callback[i].write(data, is_delete);
1233 for (i = 0; i < TOMOYO_MAX_GROUP; i++)
1234 if (tomoyo_str_starts(&data, tomoyo_group_name[i]))
1235 return tomoyo_write_group(data, is_delete, i);
1240 * tomoyo_read_group - Read "struct tomoyo_path_group"/"struct tomoyo_number_group" list.
1242 * @head: Pointer to "struct tomoyo_io_buffer".
1243 * @idx: Index number.
1245 * Returns true on success, false otherwise.
1247 * Caller holds tomoyo_read_lock().
1249 static bool tomoyo_read_group(struct tomoyo_io_buffer *head, const int idx)
1251 list_for_each_cookie(head->r.group, &tomoyo_group_list[idx]) {
1252 struct tomoyo_group *group =
1253 list_entry(head->r.group, typeof(*group), head.list);
1254 list_for_each_cookie(head->r.acl, &group->member_list) {
1255 struct tomoyo_acl_head *ptr =
1256 list_entry(head->r.acl, typeof(*ptr), list);
1257 if (ptr->is_deleted)
1259 if (!tomoyo_flush(head))
1261 tomoyo_set_string(head, tomoyo_group_name[idx]);
1262 tomoyo_set_string(head, group->group_name->name);
1263 if (idx == TOMOYO_PATH_GROUP) {
1264 tomoyo_set_space(head);
1265 tomoyo_set_string(head, container_of
1266 (ptr, struct tomoyo_path_group,
1267 head)->member_name->name);
1268 } else if (idx == TOMOYO_NUMBER_GROUP) {
1269 tomoyo_print_number_union(head, &container_of
1271 struct tomoyo_number_group,
1274 tomoyo_set_lf(head);
1278 head->r.group = NULL;
1283 * tomoyo_read_policy - Read "struct tomoyo_..._entry" list.
1285 * @head: Pointer to "struct tomoyo_io_buffer".
1286 * @idx: Index number.
1288 * Returns true on success, false otherwise.
1290 * Caller holds tomoyo_read_lock().
1292 static bool tomoyo_read_policy(struct tomoyo_io_buffer *head, const int idx)
1294 list_for_each_cookie(head->r.acl, &tomoyo_policy_list[idx]) {
1295 struct tomoyo_acl_head *acl =
1296 container_of(head->r.acl, typeof(*acl), list);
1297 if (acl->is_deleted)
1299 if (!tomoyo_flush(head))
1302 case TOMOYO_ID_TRANSITION_CONTROL:
1304 struct tomoyo_transition_control *ptr =
1305 container_of(acl, typeof(*ptr), head);
1306 tomoyo_set_string(head,
1307 tomoyo_transition_type
1310 tomoyo_set_string(head,
1311 ptr->program->name);
1312 if (ptr->program && ptr->domainname)
1313 tomoyo_set_string(head, " from ");
1314 if (ptr->domainname)
1315 tomoyo_set_string(head,
1320 case TOMOYO_ID_AGGREGATOR:
1322 struct tomoyo_aggregator *ptr =
1323 container_of(acl, typeof(*ptr), head);
1324 tomoyo_set_string(head, "aggregator ");
1325 tomoyo_set_string(head,
1326 ptr->original_name->name);
1327 tomoyo_set_space(head);
1328 tomoyo_set_string(head,
1329 ptr->aggregated_name->name);
1335 tomoyo_set_lf(head);
1342 * tomoyo_read_exception - Read exception policy.
1344 * @head: Pointer to "struct tomoyo_io_buffer".
1346 * Caller holds tomoyo_read_lock().
1348 static void tomoyo_read_exception(struct tomoyo_io_buffer *head)
1352 while (head->r.step < TOMOYO_MAX_POLICY &&
1353 tomoyo_read_policy(head, head->r.step))
1355 if (head->r.step < TOMOYO_MAX_POLICY)
1357 while (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP &&
1358 tomoyo_read_group(head, head->r.step - TOMOYO_MAX_POLICY))
1360 if (head->r.step < TOMOYO_MAX_POLICY + TOMOYO_MAX_GROUP)
1366 * tomoyo_print_header - Get header line of audit log.
1368 * @r: Pointer to "struct tomoyo_request_info".
1370 * Returns string representation.
1372 * This function uses kmalloc(), so caller must kfree() if this function
1373 * didn't return NULL.
1375 static char *tomoyo_print_header(struct tomoyo_request_info *r)
1378 const pid_t gpid = task_pid_nr(current);
1379 static const int tomoyo_buffer_len = 4096;
1380 char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS);
1384 do_gettimeofday(&tv);
1386 ppid = task_tgid_vnr(current->real_parent);
1388 snprintf(buffer, tomoyo_buffer_len - 1,
1389 "#timestamp=%lu profile=%u mode=%s (global-pid=%u)"
1390 " task={ pid=%u ppid=%u uid=%u gid=%u euid=%u"
1391 " egid=%u suid=%u sgid=%u fsuid=%u fsgid=%u }",
1392 tv.tv_sec, r->profile, tomoyo_mode[r->mode], gpid,
1393 task_tgid_vnr(current), ppid,
1394 current_uid(), current_gid(), current_euid(),
1395 current_egid(), current_suid(), current_sgid(),
1396 current_fsuid(), current_fsgid());
1401 * tomoyo_init_audit_log - Allocate buffer for audit logs.
1403 * @len: Required size.
1404 * @r: Pointer to "struct tomoyo_request_info".
1406 * Returns pointer to allocated memory.
1408 * The @len is updated to add the header lines' size on success.
1410 * This function uses kzalloc(), so caller must kfree() if this function
1411 * didn't return NULL.
1413 static char *tomoyo_init_audit_log(int *len, struct tomoyo_request_info *r)
1417 const char *domainname;
1419 r->domain = tomoyo_domain();
1420 domainname = r->domain->domainname->name;
1421 header = tomoyo_print_header(r);
1424 *len += strlen(domainname) + strlen(header) + 10;
1425 buf = kzalloc(*len, GFP_NOFS);
1427 snprintf(buf, (*len) - 1, "%s\n%s\n", header, domainname);
1432 /* Wait queue for tomoyo_query_list. */
1433 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1435 /* Lock for manipulating tomoyo_query_list. */
1436 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1438 /* Structure for query. */
1439 struct tomoyo_query {
1440 struct list_head list;
1443 unsigned int serial;
1448 /* The list for "struct tomoyo_query". */
1449 static LIST_HEAD(tomoyo_query_list);
1452 * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1455 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1458 * tomoyo_supervisor - Ask for the supervisor's decision.
1460 * @r: Pointer to "struct tomoyo_request_info".
1461 * @fmt: The printf()'s format string, followed by parameters.
1463 * Returns 0 if the supervisor decided to permit the access request which
1464 * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1465 * supervisor decided to retry the access request which violated the policy in
1466 * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1468 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
1474 static unsigned int tomoyo_serial;
1475 struct tomoyo_query *entry = NULL;
1476 bool quota_exceeded = false;
1480 case TOMOYO_CONFIG_LEARNING:
1481 if (!tomoyo_domain_quota_is_ok(r))
1483 va_start(args, fmt);
1484 len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 4;
1486 buffer = kmalloc(len, GFP_NOFS);
1489 va_start(args, fmt);
1490 vsnprintf(buffer, len - 1, fmt, args);
1492 tomoyo_normalize_line(buffer);
1493 tomoyo_write_domain2(buffer, r->domain, false);
1496 case TOMOYO_CONFIG_PERMISSIVE:
1500 r->domain = tomoyo_domain();
1501 if (!atomic_read(&tomoyo_query_observers))
1503 va_start(args, fmt);
1504 len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 32;
1506 header = tomoyo_init_audit_log(&len, r);
1509 entry = kzalloc(sizeof(*entry), GFP_NOFS);
1512 entry->query = kzalloc(len, GFP_NOFS);
1515 len = ksize(entry->query);
1516 spin_lock(&tomoyo_query_list_lock);
1517 if (tomoyo_quota_for_query && tomoyo_query_memory_size + len +
1518 sizeof(*entry) >= tomoyo_quota_for_query) {
1519 quota_exceeded = true;
1521 tomoyo_query_memory_size += len + sizeof(*entry);
1522 entry->serial = tomoyo_serial++;
1524 spin_unlock(&tomoyo_query_list_lock);
1527 pos = snprintf(entry->query, len - 1, "Q%u-%hu\n%s",
1528 entry->serial, r->retry, header);
1531 va_start(args, fmt);
1532 vsnprintf(entry->query + pos, len - 1 - pos, fmt, args);
1533 entry->query_len = strlen(entry->query) + 1;
1535 spin_lock(&tomoyo_query_list_lock);
1536 list_add_tail(&entry->list, &tomoyo_query_list);
1537 spin_unlock(&tomoyo_query_list_lock);
1538 /* Give 10 seconds for supervisor's opinion. */
1539 for (entry->timer = 0;
1540 atomic_read(&tomoyo_query_observers) && entry->timer < 100;
1542 wake_up(&tomoyo_query_wait);
1543 set_current_state(TASK_INTERRUPTIBLE);
1544 schedule_timeout(HZ / 10);
1548 spin_lock(&tomoyo_query_list_lock);
1549 list_del(&entry->list);
1550 tomoyo_query_memory_size -= len + sizeof(*entry);
1551 spin_unlock(&tomoyo_query_list_lock);
1552 switch (entry->answer) {
1553 case 3: /* Asked to retry by administrator. */
1554 error = TOMOYO_RETRY_REQUEST;
1558 /* Granted by administrator. */
1565 /* Rejected by administrator. */
1570 kfree(entry->query);
1577 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
1579 * @file: Pointer to "struct file".
1580 * @wait: Pointer to "poll_table".
1582 * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
1584 * Waits for access requests which violated policy in enforcing mode.
1586 static int tomoyo_poll_query(struct file *file, poll_table *wait)
1588 struct list_head *tmp;
1591 for (i = 0; i < 2; i++) {
1592 spin_lock(&tomoyo_query_list_lock);
1593 list_for_each(tmp, &tomoyo_query_list) {
1594 struct tomoyo_query *ptr =
1595 list_entry(tmp, typeof(*ptr), list);
1601 spin_unlock(&tomoyo_query_list_lock);
1603 return POLLIN | POLLRDNORM;
1606 poll_wait(file, &tomoyo_query_wait, wait);
1612 * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
1614 * @head: Pointer to "struct tomoyo_io_buffer".
1616 static void tomoyo_read_query(struct tomoyo_io_buffer *head)
1618 struct list_head *tmp;
1624 if (head->read_buf) {
1625 kfree(head->read_buf);
1626 head->read_buf = NULL;
1628 spin_lock(&tomoyo_query_list_lock);
1629 list_for_each(tmp, &tomoyo_query_list) {
1630 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
1633 if (pos++ != head->r.query_index)
1635 len = ptr->query_len;
1638 spin_unlock(&tomoyo_query_list_lock);
1640 head->r.query_index = 0;
1643 buf = kzalloc(len, GFP_NOFS);
1647 spin_lock(&tomoyo_query_list_lock);
1648 list_for_each(tmp, &tomoyo_query_list) {
1649 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
1652 if (pos++ != head->r.query_index)
1655 * Some query can be skipped because tomoyo_query_list
1656 * can change, but I don't care.
1658 if (len == ptr->query_len)
1659 memmove(buf, ptr->query, len);
1662 spin_unlock(&tomoyo_query_list_lock);
1664 head->read_buf = buf;
1665 head->r.w[head->r.w_pos++] = buf;
1666 head->r.query_index++;
1673 * tomoyo_write_answer - Write the supervisor's decision.
1675 * @head: Pointer to "struct tomoyo_io_buffer".
1677 * Returns 0 on success, -EINVAL otherwise.
1679 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
1681 char *data = head->write_buf;
1682 struct list_head *tmp;
1683 unsigned int serial;
1684 unsigned int answer;
1685 spin_lock(&tomoyo_query_list_lock);
1686 list_for_each(tmp, &tomoyo_query_list) {
1687 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
1690 spin_unlock(&tomoyo_query_list_lock);
1691 if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
1693 spin_lock(&tomoyo_query_list_lock);
1694 list_for_each(tmp, &tomoyo_query_list) {
1695 struct tomoyo_query *ptr = list_entry(tmp, typeof(*ptr), list);
1696 if (ptr->serial != serial)
1699 ptr->answer = answer;
1702 spin_unlock(&tomoyo_query_list_lock);
1707 * tomoyo_read_version: Get version.
1709 * @head: Pointer to "struct tomoyo_io_buffer".
1711 * Returns version information.
1713 static void tomoyo_read_version(struct tomoyo_io_buffer *head)
1716 tomoyo_io_printf(head, "2.3.0");
1722 * tomoyo_read_self_domain - Get the current process's domainname.
1724 * @head: Pointer to "struct tomoyo_io_buffer".
1726 * Returns the current process's domainname.
1728 static void tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
1732 * tomoyo_domain()->domainname != NULL
1733 * because every process belongs to a domain and
1734 * the domain's name cannot be NULL.
1736 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name);
1742 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
1744 * @type: Type of interface.
1745 * @file: Pointer to "struct file".
1747 * Associates policy handler and returns 0 on success, -ENOMEM otherwise.
1749 * Caller acquires tomoyo_read_lock().
1751 int tomoyo_open_control(const u8 type, struct file *file)
1753 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
1757 mutex_init(&head->io_sem);
1760 case TOMOYO_DOMAINPOLICY:
1761 /* /sys/kernel/security/tomoyo/domain_policy */
1762 head->write = tomoyo_write_domain;
1763 head->read = tomoyo_read_domain;
1765 case TOMOYO_EXCEPTIONPOLICY:
1766 /* /sys/kernel/security/tomoyo/exception_policy */
1767 head->write = tomoyo_write_exception;
1768 head->read = tomoyo_read_exception;
1770 case TOMOYO_SELFDOMAIN:
1771 /* /sys/kernel/security/tomoyo/self_domain */
1772 head->read = tomoyo_read_self_domain;
1774 case TOMOYO_DOMAIN_STATUS:
1775 /* /sys/kernel/security/tomoyo/.domain_status */
1776 head->write = tomoyo_write_domain_profile;
1777 head->read = tomoyo_read_domain_profile;
1779 case TOMOYO_PROCESS_STATUS:
1780 /* /sys/kernel/security/tomoyo/.process_status */
1781 head->write = tomoyo_write_pid;
1782 head->read = tomoyo_read_pid;
1784 case TOMOYO_VERSION:
1785 /* /sys/kernel/security/tomoyo/version */
1786 head->read = tomoyo_read_version;
1787 head->readbuf_size = 128;
1789 case TOMOYO_MEMINFO:
1790 /* /sys/kernel/security/tomoyo/meminfo */
1791 head->write = tomoyo_write_memory_quota;
1792 head->read = tomoyo_read_memory_counter;
1793 head->readbuf_size = 512;
1795 case TOMOYO_PROFILE:
1796 /* /sys/kernel/security/tomoyo/profile */
1797 head->write = tomoyo_write_profile;
1798 head->read = tomoyo_read_profile;
1800 case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
1801 head->poll = tomoyo_poll_query;
1802 head->write = tomoyo_write_answer;
1803 head->read = tomoyo_read_query;
1805 case TOMOYO_MANAGER:
1806 /* /sys/kernel/security/tomoyo/manager */
1807 head->write = tomoyo_write_manager;
1808 head->read = tomoyo_read_manager;
1811 if (!(file->f_mode & FMODE_READ)) {
1813 * No need to allocate read_buf since it is not opened
1818 } else if (!head->poll) {
1819 /* Don't allocate read_buf for poll() access. */
1820 if (!head->readbuf_size)
1821 head->readbuf_size = 4096 * 2;
1822 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
1823 if (!head->read_buf) {
1828 if (!(file->f_mode & FMODE_WRITE)) {
1830 * No need to allocate write_buf since it is not opened
1834 } else if (head->write) {
1835 head->writebuf_size = 4096 * 2;
1836 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
1837 if (!head->write_buf) {
1838 kfree(head->read_buf);
1843 if (type != TOMOYO_QUERY)
1844 head->reader_idx = tomoyo_read_lock();
1845 file->private_data = head;
1847 * If the file is /sys/kernel/security/tomoyo/query , increment the
1849 * The obserber counter is used by tomoyo_supervisor() to see if
1850 * there is some process monitoring /sys/kernel/security/tomoyo/query.
1852 if (type == TOMOYO_QUERY)
1853 atomic_inc(&tomoyo_query_observers);
1858 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
1860 * @file: Pointer to "struct file".
1861 * @wait: Pointer to "poll_table".
1863 * Waits for read readiness.
1864 * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd .
1866 int tomoyo_poll_control(struct file *file, poll_table *wait)
1868 struct tomoyo_io_buffer *head = file->private_data;
1871 return head->poll(file, wait);
1875 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
1877 * @head: Pointer to "struct tomoyo_io_buffer".
1878 * @buffer: Poiner to buffer to write to.
1879 * @buffer_len: Size of @buffer.
1881 * Returns bytes read on success, negative value otherwise.
1883 * Caller holds tomoyo_read_lock().
1885 int tomoyo_read_control(struct tomoyo_io_buffer *head, char __user *buffer,
1886 const int buffer_len)
1892 if (mutex_lock_interruptible(&head->io_sem))
1894 head->read_user_buf = buffer;
1895 head->read_user_buf_avail = buffer_len;
1896 if (tomoyo_flush(head))
1897 /* Call the policy handler. */
1900 len = head->read_user_buf - buffer;
1901 mutex_unlock(&head->io_sem);
1906 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
1908 * @head: Pointer to "struct tomoyo_io_buffer".
1909 * @buffer: Pointer to buffer to read from.
1910 * @buffer_len: Size of @buffer.
1912 * Returns @buffer_len on success, negative value otherwise.
1914 * Caller holds tomoyo_read_lock().
1916 int tomoyo_write_control(struct tomoyo_io_buffer *head,
1917 const char __user *buffer, const int buffer_len)
1919 int error = buffer_len;
1920 int avail_len = buffer_len;
1921 char *cp0 = head->write_buf;
1925 if (!access_ok(VERIFY_READ, buffer, buffer_len))
1927 /* Don't allow updating policies by non manager programs. */
1928 if (head->write != tomoyo_write_pid &&
1929 head->write != tomoyo_write_domain && !tomoyo_manager())
1931 if (mutex_lock_interruptible(&head->io_sem))
1933 /* Read a line and dispatch it to the policy handler. */
1934 while (avail_len > 0) {
1936 if (head->w.avail >= head->writebuf_size - 1) {
1939 } else if (get_user(c, buffer)) {
1945 cp0[head->w.avail++] = c;
1948 cp0[head->w.avail - 1] = '\0';
1950 tomoyo_normalize_line(cp0);
1953 mutex_unlock(&head->io_sem);
1958 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
1960 * @head: Pointer to "struct tomoyo_io_buffer".
1962 * Releases memory and returns 0.
1964 * Caller looses tomoyo_read_lock().
1966 int tomoyo_close_control(struct tomoyo_io_buffer *head)
1968 const bool is_write = !!head->write_buf;
1971 * If the file is /sys/kernel/security/tomoyo/query , decrement the
1974 if (head->type == TOMOYO_QUERY)
1975 atomic_dec(&tomoyo_query_observers);
1977 tomoyo_read_unlock(head->reader_idx);
1978 /* Release memory used for policy I/O. */
1979 kfree(head->read_buf);
1980 head->read_buf = NULL;
1981 kfree(head->write_buf);
1982 head->write_buf = NULL;
1990 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
1992 void tomoyo_check_profile(void)
1994 struct tomoyo_domain_info *domain;
1995 const int idx = tomoyo_read_lock();
1996 tomoyo_policy_loaded = true;
1997 /* Check all profiles currently assigned to domains are defined. */
1998 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1999 const u8 profile = domain->profile;
2000 if (tomoyo_profile_ptr[profile])
2002 printk(KERN_ERR "You need to define profile %u before using it.\n",
2004 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.3/ "
2005 "for more information.\n");
2006 panic("Profile %u (used by '%s') not defined.\n",
2007 profile, domain->domainname->name);
2009 tomoyo_read_unlock(idx);
2010 if (tomoyo_profile_version != 20090903) {
2011 printk(KERN_ERR "You need to install userland programs for "
2012 "TOMOYO 2.3 and initialize policy configuration.\n");
2013 printk(KERN_ERR "Please see http://tomoyo.sourceforge.jp/2.3/ "
2014 "for more information.\n");
2015 panic("Profile version %u is not supported.\n",
2016 tomoyo_profile_version);
2018 printk(KERN_INFO "TOMOYO: 2.3.0\n");
2019 printk(KERN_INFO "Mandatory Access Control activated.\n");