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>
12 #include <linux/hardirq.h>
15 /* String table for functionality that takes 4 modes. */
16 static const char *tomoyo_mode_4[4] = {
17 "disabled", "learning", "permissive", "enforcing"
19 /* String table for functionality that takes 2 modes. */
20 static const char *tomoyo_mode_2[4] = {
21 "disabled", "enabled", "enabled", "enabled"
25 * tomoyo_control_array is a static data which contains
27 * (1) functionality name used by /sys/kernel/security/tomoyo/profile .
28 * (2) initial values for "struct tomoyo_profile".
29 * (3) max values for "struct tomoyo_profile".
33 unsigned int current_value;
34 const unsigned int max_value;
35 } tomoyo_control_array[TOMOYO_MAX_CONTROL_INDEX] = {
36 [TOMOYO_MAC_FOR_FILE] = { "MAC_FOR_FILE", 0, 3 },
37 [TOMOYO_MAX_ACCEPT_ENTRY] = { "MAX_ACCEPT_ENTRY", 2048, INT_MAX },
38 [TOMOYO_VERBOSE] = { "TOMOYO_VERBOSE", 1, 1 },
42 * tomoyo_profile is a structure which is used for holding the mode of access
43 * controls. TOMOYO has 4 modes: disabled, learning, permissive, enforcing.
44 * An administrator can define up to 256 profiles.
45 * The ->profile of "struct tomoyo_domain_info" is used for remembering
46 * the profile's number (0 - 255) assigned to that domain.
48 static struct tomoyo_profile {
49 unsigned int value[TOMOYO_MAX_CONTROL_INDEX];
50 const struct tomoyo_path_info *comment;
51 } *tomoyo_profile_ptr[TOMOYO_MAX_PROFILES];
53 /* Permit policy management by non-root user? */
54 static bool tomoyo_manage_by_non_root;
56 /* Utility functions. */
59 * tomoyo_print_name_union - Print a tomoyo_name_union.
61 * @head: Pointer to "struct tomoyo_io_buffer".
62 * @ptr: Pointer to "struct tomoyo_name_union".
64 * Returns true on success, false otherwise.
66 static bool tomoyo_print_name_union(struct tomoyo_io_buffer *head,
67 const struct tomoyo_name_union *ptr)
69 int pos = head->read_avail;
70 if (pos && head->read_buf[pos - 1] == ' ')
73 return tomoyo_io_printf(head, " @%s",
74 ptr->group->group_name->name);
75 return tomoyo_io_printf(head, " %s", ptr->filename->name);
79 * tomoyo_print_number_union - Print a tomoyo_number_union.
81 * @head: Pointer to "struct tomoyo_io_buffer".
82 * @ptr: Pointer to "struct tomoyo_number_union".
84 * Returns true on success, false otherwise.
86 bool tomoyo_print_number_union(struct tomoyo_io_buffer *head,
87 const struct tomoyo_number_union *ptr)
93 if (!tomoyo_io_printf(head, " "))
96 return tomoyo_io_printf(head, "@%s",
97 ptr->group->group_name->name);
98 min_type = ptr->min_type;
99 max_type = ptr->max_type;
100 min = ptr->values[0];
101 max = ptr->values[1];
103 case TOMOYO_VALUE_TYPE_HEXADECIMAL:
104 if (!tomoyo_io_printf(head, "0x%lX", min))
107 case TOMOYO_VALUE_TYPE_OCTAL:
108 if (!tomoyo_io_printf(head, "0%lo", min))
112 if (!tomoyo_io_printf(head, "%lu", min))
116 if (min == max && min_type == max_type)
119 case TOMOYO_VALUE_TYPE_HEXADECIMAL:
120 return tomoyo_io_printf(head, "-0x%lX", max);
121 case TOMOYO_VALUE_TYPE_OCTAL:
122 return tomoyo_io_printf(head, "-0%lo", max);
124 return tomoyo_io_printf(head, "-%lu", max);
129 * tomoyo_io_printf - Transactional printf() to "struct tomoyo_io_buffer" structure.
131 * @head: Pointer to "struct tomoyo_io_buffer".
132 * @fmt: The printf()'s format string, followed by parameters.
134 * Returns true if output was written, false otherwise.
136 * The snprintf() will truncate, but tomoyo_io_printf() won't.
138 bool tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
142 int pos = head->read_avail;
143 int size = head->readbuf_size - pos;
148 len = vsnprintf(head->read_buf + pos, size, fmt, args);
150 if (pos + len >= head->readbuf_size)
152 head->read_avail += len;
157 * tomoyo_check_flags - Check mode for specified functionality.
159 * @domain: Pointer to "struct tomoyo_domain_info".
160 * @index: The functionality to check mode.
162 * TOMOYO checks only process context.
163 * This code disables TOMOYO's enforcement in case the function is called from
166 unsigned int tomoyo_check_flags(const struct tomoyo_domain_info *domain,
169 const u8 profile = domain->profile;
171 if (WARN_ON(in_interrupt()))
173 return tomoyo_policy_loaded && index < TOMOYO_MAX_CONTROL_INDEX
174 #if TOMOYO_MAX_PROFILES != 256
175 && profile < TOMOYO_MAX_PROFILES
177 && tomoyo_profile_ptr[profile] ?
178 tomoyo_profile_ptr[profile]->value[index] : 0;
182 * tomoyo_verbose_mode - Check whether TOMOYO is verbose mode.
184 * @domain: Pointer to "struct tomoyo_domain_info".
186 * Returns true if domain policy violation warning should be printed to
189 bool tomoyo_verbose_mode(const struct tomoyo_domain_info *domain)
191 return tomoyo_check_flags(domain, TOMOYO_VERBOSE) != 0;
195 * tomoyo_find_or_assign_new_profile - Create a new profile.
197 * @profile: Profile number to create.
199 * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
201 static struct tomoyo_profile *tomoyo_find_or_assign_new_profile(const unsigned
204 struct tomoyo_profile *ptr = NULL;
207 if (profile >= TOMOYO_MAX_PROFILES)
209 if (mutex_lock_interruptible(&tomoyo_policy_lock))
211 ptr = tomoyo_profile_ptr[profile];
214 ptr = kmalloc(sizeof(*ptr), GFP_NOFS);
215 if (!tomoyo_memory_ok(ptr)) {
220 for (i = 0; i < TOMOYO_MAX_CONTROL_INDEX; i++)
221 ptr->value[i] = tomoyo_control_array[i].current_value;
222 mb(); /* Avoid out-of-order execution. */
223 tomoyo_profile_ptr[profile] = ptr;
225 mutex_unlock(&tomoyo_policy_lock);
230 * tomoyo_write_profile - Write to profile table.
232 * @head: Pointer to "struct tomoyo_io_buffer".
234 * Returns 0 on success, negative value otherwise.
236 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
238 char *data = head->write_buf;
242 struct tomoyo_profile *profile;
245 cp = strchr(data, '-');
248 if (strict_strtoul(data, 10, &num))
252 profile = tomoyo_find_or_assign_new_profile(num);
255 cp = strchr(data, '=');
259 if (!strcmp(data, "COMMENT")) {
260 const struct tomoyo_path_info *old_comment = profile->comment;
261 profile->comment = tomoyo_get_name(cp + 1);
262 tomoyo_put_name(old_comment);
265 for (i = 0; i < TOMOYO_MAX_CONTROL_INDEX; i++) {
266 if (strcmp(data, tomoyo_control_array[i].keyword))
268 if (sscanf(cp + 1, "%u", &value) != 1) {
273 modes = tomoyo_mode_2;
276 modes = tomoyo_mode_4;
279 for (j = 0; j < 4; j++) {
280 if (strcmp(cp + 1, modes[j]))
287 } else if (value > tomoyo_control_array[i].max_value) {
288 value = tomoyo_control_array[i].max_value;
290 profile->value[i] = value;
297 * tomoyo_read_profile - Read from profile table.
299 * @head: Pointer to "struct tomoyo_io_buffer".
303 static int tomoyo_read_profile(struct tomoyo_io_buffer *head)
305 static const int total = TOMOYO_MAX_CONTROL_INDEX + 1;
310 for (step = head->read_step; step < TOMOYO_MAX_PROFILES * total;
312 const u8 index = step / total;
313 u8 type = step % total;
314 const struct tomoyo_profile *profile
315 = tomoyo_profile_ptr[index];
316 head->read_step = step;
319 if (!type) { /* Print profile' comment tag. */
320 if (!tomoyo_io_printf(head, "%u-COMMENT=%s\n",
321 index, profile->comment ?
322 profile->comment->name : ""))
327 if (type < TOMOYO_MAX_CONTROL_INDEX) {
328 const unsigned int value = profile->value[type];
329 const char **modes = NULL;
331 = tomoyo_control_array[type].keyword;
332 switch (tomoyo_control_array[type].max_value) {
334 modes = tomoyo_mode_4;
337 modes = tomoyo_mode_2;
341 if (!tomoyo_io_printf(head, "%u-%s=%s\n", index,
342 keyword, modes[value]))
345 if (!tomoyo_io_printf(head, "%u-%s=%u\n", index,
351 if (step == TOMOYO_MAX_PROFILES * total)
352 head->read_eof = true;
357 * tomoyo_policy_manager_list is used for holding list of domainnames or
358 * programs which are permitted to modify configuration via
359 * /sys/kernel/security/tomoyo/ interface.
361 * An entry is added by
363 * # echo '<kernel> /sbin/mingetty /bin/login /bin/bash' > \
364 * /sys/kernel/security/tomoyo/manager
365 * (if you want to specify by a domainname)
369 * # echo '/usr/lib/ccs/editpolicy' > /sys/kernel/security/tomoyo/manager
370 * (if you want to specify by a program's location)
374 * # echo 'delete <kernel> /sbin/mingetty /bin/login /bin/bash' > \
375 * /sys/kernel/security/tomoyo/manager
379 * # echo 'delete /usr/lib/ccs/editpolicy' > \
380 * /sys/kernel/security/tomoyo/manager
382 * and all entries are retrieved by
384 * # cat /sys/kernel/security/tomoyo/manager
386 LIST_HEAD(tomoyo_policy_manager_list);
389 * tomoyo_update_manager_entry - Add a manager entry.
391 * @manager: The path to manager or the domainnamme.
392 * @is_delete: True if it is a delete request.
394 * Returns 0 on success, negative value otherwise.
396 * Caller holds tomoyo_read_lock().
398 static int tomoyo_update_manager_entry(const char *manager,
399 const bool is_delete)
401 struct tomoyo_policy_manager_entry *ptr;
402 struct tomoyo_policy_manager_entry e = { };
403 int error = is_delete ? -ENOENT : -ENOMEM;
405 if (tomoyo_is_domain_def(manager)) {
406 if (!tomoyo_is_correct_domain(manager))
410 if (!tomoyo_is_correct_path(manager, 1, -1, -1))
413 e.manager = tomoyo_get_name(manager);
416 if (mutex_lock_interruptible(&tomoyo_policy_lock))
418 list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) {
419 if (ptr->manager != e.manager)
421 ptr->is_deleted = is_delete;
425 if (!is_delete && error) {
426 struct tomoyo_policy_manager_entry *entry =
427 tomoyo_commit_ok(&e, sizeof(e));
429 list_add_tail_rcu(&entry->list,
430 &tomoyo_policy_manager_list);
434 mutex_unlock(&tomoyo_policy_lock);
436 tomoyo_put_name(e.manager);
441 * tomoyo_write_manager_policy - Write manager policy.
443 * @head: Pointer to "struct tomoyo_io_buffer".
445 * Returns 0 on success, negative value otherwise.
447 * Caller holds tomoyo_read_lock().
449 static int tomoyo_write_manager_policy(struct tomoyo_io_buffer *head)
451 char *data = head->write_buf;
452 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
454 if (!strcmp(data, "manage_by_non_root")) {
455 tomoyo_manage_by_non_root = !is_delete;
458 return tomoyo_update_manager_entry(data, is_delete);
462 * tomoyo_read_manager_policy - Read manager policy.
464 * @head: Pointer to "struct tomoyo_io_buffer".
468 * Caller holds tomoyo_read_lock().
470 static int tomoyo_read_manager_policy(struct tomoyo_io_buffer *head)
472 struct list_head *pos;
477 list_for_each_cookie(pos, head->read_var2,
478 &tomoyo_policy_manager_list) {
479 struct tomoyo_policy_manager_entry *ptr;
480 ptr = list_entry(pos, struct tomoyo_policy_manager_entry,
484 done = tomoyo_io_printf(head, "%s\n", ptr->manager->name);
488 head->read_eof = done;
493 * tomoyo_is_policy_manager - Check whether the current process is a policy manager.
495 * Returns true if the current process is permitted to modify policy
496 * via /sys/kernel/security/tomoyo/ interface.
498 * Caller holds tomoyo_read_lock().
500 static bool tomoyo_is_policy_manager(void)
502 struct tomoyo_policy_manager_entry *ptr;
504 const struct task_struct *task = current;
505 const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
508 if (!tomoyo_policy_loaded)
510 if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
512 list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) {
513 if (!ptr->is_deleted && ptr->is_domain
514 && !tomoyo_pathcmp(domainname, ptr->manager)) {
521 exe = tomoyo_get_exe();
524 list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) {
525 if (!ptr->is_deleted && !ptr->is_domain
526 && !strcmp(exe, ptr->manager->name)) {
531 if (!found) { /* Reduce error messages. */
532 static pid_t last_pid;
533 const pid_t pid = current->pid;
534 if (last_pid != pid) {
535 printk(KERN_WARNING "%s ( %s ) is not permitted to "
536 "update policies.\n", domainname->name, exe);
545 * tomoyo_is_select_one - Parse select command.
547 * @head: Pointer to "struct tomoyo_io_buffer".
548 * @data: String to parse.
550 * Returns true on success, false otherwise.
552 * Caller holds tomoyo_read_lock().
554 static bool tomoyo_is_select_one(struct tomoyo_io_buffer *head,
558 struct tomoyo_domain_info *domain = NULL;
560 if (sscanf(data, "pid=%u", &pid) == 1) {
561 struct task_struct *p;
563 read_lock(&tasklist_lock);
564 p = find_task_by_vpid(pid);
566 domain = tomoyo_real_domain(p);
567 read_unlock(&tasklist_lock);
569 } else if (!strncmp(data, "domain=", 7)) {
570 if (tomoyo_is_domain_def(data + 7))
571 domain = tomoyo_find_domain(data + 7);
574 head->write_var1 = domain;
575 /* Accessing read_buf is safe because head->io_sem is held. */
577 return true; /* Do nothing if open(O_WRONLY). */
578 head->read_avail = 0;
579 tomoyo_io_printf(head, "# select %s\n", data);
580 head->read_single_domain = true;
581 head->read_eof = !domain;
583 struct tomoyo_domain_info *d;
584 head->read_var1 = NULL;
585 list_for_each_entry_rcu(d, &tomoyo_domain_list, list) {
588 head->read_var1 = &d->list;
590 head->read_var2 = NULL;
593 if (domain->is_deleted)
594 tomoyo_io_printf(head, "# This is a deleted domain.\n");
600 * tomoyo_delete_domain - Delete a domain.
602 * @domainname: The name of domain.
606 * Caller holds tomoyo_read_lock().
608 static int tomoyo_delete_domain(char *domainname)
610 struct tomoyo_domain_info *domain;
611 struct tomoyo_path_info name;
613 name.name = domainname;
614 tomoyo_fill_path_info(&name);
615 if (mutex_lock_interruptible(&tomoyo_policy_lock))
617 /* Is there an active domain? */
618 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
619 /* Never delete tomoyo_kernel_domain */
620 if (domain == &tomoyo_kernel_domain)
622 if (domain->is_deleted ||
623 tomoyo_pathcmp(domain->domainname, &name))
625 domain->is_deleted = true;
628 mutex_unlock(&tomoyo_policy_lock);
633 * tomoyo_write_domain_policy2 - Write domain policy.
635 * @head: Pointer to "struct tomoyo_io_buffer".
637 * Returns 0 on success, negative value otherwise.
639 * Caller holds tomoyo_read_lock().
641 static int tomoyo_write_domain_policy2(char *data,
642 struct tomoyo_domain_info *domain,
643 const bool is_delete)
645 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_MOUNT))
646 return tomoyo_write_mount_policy(data, domain, is_delete);
647 return tomoyo_write_file_policy(data, domain, is_delete);
651 * tomoyo_write_domain_policy - Write domain policy.
653 * @head: Pointer to "struct tomoyo_io_buffer".
655 * Returns 0 on success, negative value otherwise.
657 * Caller holds tomoyo_read_lock().
659 static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head)
661 char *data = head->write_buf;
662 struct tomoyo_domain_info *domain = head->write_var1;
663 bool is_delete = false;
664 bool is_select = false;
665 unsigned int profile;
667 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE))
669 else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT))
671 if (is_select && tomoyo_is_select_one(head, data))
673 /* Don't allow updating policies by non manager programs. */
674 if (!tomoyo_is_policy_manager())
676 if (tomoyo_is_domain_def(data)) {
679 tomoyo_delete_domain(data);
681 domain = tomoyo_find_domain(data);
683 domain = tomoyo_find_or_assign_new_domain(data, 0);
684 head->write_var1 = domain;
690 if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1
691 && profile < TOMOYO_MAX_PROFILES) {
692 if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)
693 domain->profile = (u8) profile;
696 if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) {
697 domain->ignore_global_allow_read = !is_delete;
700 return tomoyo_write_domain_policy2(data, domain, is_delete);
704 * tomoyo_print_path_acl - Print a single path ACL entry.
706 * @head: Pointer to "struct tomoyo_io_buffer".
707 * @ptr: Pointer to "struct tomoyo_path_acl".
709 * Returns true on success, false otherwise.
711 static bool tomoyo_print_path_acl(struct tomoyo_io_buffer *head,
712 struct tomoyo_path_acl *ptr)
716 const u16 perm = ptr->perm;
718 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
719 if (!(perm & (1 << bit)))
721 /* Print "read/write" instead of "read" and "write". */
722 if ((bit == TOMOYO_TYPE_READ || bit == TOMOYO_TYPE_WRITE)
723 && (perm & (1 << TOMOYO_TYPE_READ_WRITE)))
725 pos = head->read_avail;
726 if (!tomoyo_io_printf(head, "allow_%s ",
727 tomoyo_path2keyword(bit)) ||
728 !tomoyo_print_name_union(head, &ptr->name) ||
729 !tomoyo_io_printf(head, "\n"))
735 head->read_bit = bit;
736 head->read_avail = pos;
741 * tomoyo_print_path2_acl - Print a double path ACL entry.
743 * @head: Pointer to "struct tomoyo_io_buffer".
744 * @ptr: Pointer to "struct tomoyo_path2_acl".
746 * Returns true on success, false otherwise.
748 static bool tomoyo_print_path2_acl(struct tomoyo_io_buffer *head,
749 struct tomoyo_path2_acl *ptr)
752 const u8 perm = ptr->perm;
755 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
756 if (!(perm & (1 << bit)))
758 pos = head->read_avail;
759 if (!tomoyo_io_printf(head, "allow_%s ",
760 tomoyo_path22keyword(bit)) ||
761 !tomoyo_print_name_union(head, &ptr->name1) ||
762 !tomoyo_print_name_union(head, &ptr->name2) ||
763 !tomoyo_io_printf(head, "\n"))
769 head->read_bit = bit;
770 head->read_avail = pos;
775 * tomoyo_print_path_number_acl - Print a path_number ACL entry.
777 * @head: Pointer to "struct tomoyo_io_buffer".
778 * @ptr: Pointer to "struct tomoyo_path_number_acl".
780 * Returns true on success, false otherwise.
782 static bool tomoyo_print_path_number_acl(struct tomoyo_io_buffer *head,
783 struct tomoyo_path_number_acl *ptr)
787 const u8 perm = ptr->perm;
788 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION;
790 if (!(perm & (1 << bit)))
792 pos = head->read_avail;
793 if (!tomoyo_io_printf(head, "allow_%s",
794 tomoyo_path_number2keyword(bit)) ||
795 !tomoyo_print_name_union(head, &ptr->name) ||
796 !tomoyo_print_number_union(head, &ptr->number) ||
797 !tomoyo_io_printf(head, "\n"))
803 head->read_bit = bit;
804 head->read_avail = pos;
809 * tomoyo_print_path_number3_acl - Print a path_number3 ACL entry.
811 * @head: Pointer to "struct tomoyo_io_buffer".
812 * @ptr: Pointer to "struct tomoyo_path_number3_acl".
814 * Returns true on success, false otherwise.
816 static bool tomoyo_print_path_number3_acl(struct tomoyo_io_buffer *head,
817 struct tomoyo_path_number3_acl *ptr)
821 const u16 perm = ptr->perm;
822 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER3_OPERATION;
824 if (!(perm & (1 << bit)))
826 pos = head->read_avail;
827 if (!tomoyo_io_printf(head, "allow_%s",
828 tomoyo_path_number32keyword(bit)) ||
829 !tomoyo_print_name_union(head, &ptr->name) ||
830 !tomoyo_print_number_union(head, &ptr->mode) ||
831 !tomoyo_print_number_union(head, &ptr->major) ||
832 !tomoyo_print_number_union(head, &ptr->minor) ||
833 !tomoyo_io_printf(head, "\n"))
839 head->read_bit = bit;
840 head->read_avail = pos;
845 * tomoyo_print_mount_acl - Print a mount ACL entry.
847 * @head: Pointer to "struct tomoyo_io_buffer".
848 * @ptr: Pointer to "struct tomoyo_mount_acl".
850 * Returns true on success, false otherwise.
852 static bool tomoyo_print_mount_acl(struct tomoyo_io_buffer *head,
853 struct tomoyo_mount_acl *ptr)
855 const int pos = head->read_avail;
856 if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_MOUNT) ||
857 !tomoyo_print_name_union(head, &ptr->dev_name) ||
858 !tomoyo_print_name_union(head, &ptr->dir_name) ||
859 !tomoyo_print_name_union(head, &ptr->fs_type) ||
860 !tomoyo_print_number_union(head, &ptr->flags) ||
861 !tomoyo_io_printf(head, "\n")) {
862 head->read_avail = pos;
869 * tomoyo_print_entry - Print an ACL entry.
871 * @head: Pointer to "struct tomoyo_io_buffer".
872 * @ptr: Pointer to an ACL entry.
874 * Returns true on success, false otherwise.
876 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
877 struct tomoyo_acl_info *ptr)
879 const u8 acl_type = ptr->type;
881 if (acl_type == TOMOYO_TYPE_PATH_ACL) {
882 struct tomoyo_path_acl *acl
883 = container_of(ptr, struct tomoyo_path_acl, head);
884 return tomoyo_print_path_acl(head, acl);
886 if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
887 struct tomoyo_path2_acl *acl
888 = container_of(ptr, struct tomoyo_path2_acl, head);
889 return tomoyo_print_path2_acl(head, acl);
891 if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
892 struct tomoyo_path_number_acl *acl
893 = container_of(ptr, struct tomoyo_path_number_acl,
895 return tomoyo_print_path_number_acl(head, acl);
897 if (acl_type == TOMOYO_TYPE_PATH_NUMBER3_ACL) {
898 struct tomoyo_path_number3_acl *acl
899 = container_of(ptr, struct tomoyo_path_number3_acl,
901 return tomoyo_print_path_number3_acl(head, acl);
903 if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
904 struct tomoyo_mount_acl *acl
905 = container_of(ptr, struct tomoyo_mount_acl, head);
906 return tomoyo_print_mount_acl(head, acl);
908 BUG(); /* This must not happen. */
913 * tomoyo_read_domain_policy - Read domain policy.
915 * @head: Pointer to "struct tomoyo_io_buffer".
919 * Caller holds tomoyo_read_lock().
921 static int tomoyo_read_domain_policy(struct tomoyo_io_buffer *head)
923 struct list_head *dpos;
924 struct list_head *apos;
929 if (head->read_step == 0)
931 list_for_each_cookie(dpos, head->read_var1, &tomoyo_domain_list) {
932 struct tomoyo_domain_info *domain;
933 const char *quota_exceeded = "";
934 const char *transition_failed = "";
935 const char *ignore_global_allow_read = "";
936 domain = list_entry(dpos, struct tomoyo_domain_info, list);
937 if (head->read_step != 1)
939 if (domain->is_deleted && !head->read_single_domain)
941 /* Print domainname and flags. */
942 if (domain->quota_warned)
943 quota_exceeded = "quota_exceeded\n";
944 if (domain->transition_failed)
945 transition_failed = "transition_failed\n";
946 if (domain->ignore_global_allow_read)
947 ignore_global_allow_read
948 = TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n";
949 done = tomoyo_io_printf(head, "%s\n" TOMOYO_KEYWORD_USE_PROFILE
951 domain->domainname->name,
952 domain->profile, quota_exceeded,
954 ignore_global_allow_read);
959 if (head->read_step == 3)
961 /* Print ACL entries in the domain. */
962 list_for_each_cookie(apos, head->read_var2,
963 &domain->acl_info_list) {
964 struct tomoyo_acl_info *ptr
965 = list_entry(apos, struct tomoyo_acl_info,
967 done = tomoyo_print_entry(head, ptr);
975 done = tomoyo_io_printf(head, "\n");
979 if (head->read_single_domain)
982 head->read_eof = done;
987 * tomoyo_write_domain_profile - Assign profile for specified domain.
989 * @head: Pointer to "struct tomoyo_io_buffer".
991 * Returns 0 on success, -EINVAL otherwise.
993 * This is equivalent to doing
995 * ( echo "select " $domainname; echo "use_profile " $profile ) |
996 * /usr/lib/ccs/loadpolicy -d
998 * Caller holds tomoyo_read_lock().
1000 static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head)
1002 char *data = head->write_buf;
1003 char *cp = strchr(data, ' ');
1004 struct tomoyo_domain_info *domain;
1005 unsigned long profile;
1010 domain = tomoyo_find_domain(cp + 1);
1011 if (strict_strtoul(data, 10, &profile))
1013 if (domain && profile < TOMOYO_MAX_PROFILES
1014 && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded))
1015 domain->profile = (u8) profile;
1020 * tomoyo_read_domain_profile - Read only domainname and profile.
1022 * @head: Pointer to "struct tomoyo_io_buffer".
1024 * Returns list of profile number and domainname pairs.
1026 * This is equivalent to doing
1028 * grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy |
1029 * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" )
1030 * domainname = $0; } else if ( $1 == "use_profile" ) {
1031 * print $2 " " domainname; domainname = ""; } } ; '
1033 * Caller holds tomoyo_read_lock().
1035 static int tomoyo_read_domain_profile(struct tomoyo_io_buffer *head)
1037 struct list_head *pos;
1042 list_for_each_cookie(pos, head->read_var1, &tomoyo_domain_list) {
1043 struct tomoyo_domain_info *domain;
1044 domain = list_entry(pos, struct tomoyo_domain_info, list);
1045 if (domain->is_deleted)
1047 done = tomoyo_io_printf(head, "%u %s\n", domain->profile,
1048 domain->domainname->name);
1052 head->read_eof = done;
1057 * tomoyo_write_pid: Specify PID to obtain domainname.
1059 * @head: Pointer to "struct tomoyo_io_buffer".
1063 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1066 /* No error check. */
1067 strict_strtoul(head->write_buf, 10, &pid);
1068 head->read_step = (int) pid;
1069 head->read_eof = false;
1074 * tomoyo_read_pid - Get domainname of the specified PID.
1076 * @head: Pointer to "struct tomoyo_io_buffer".
1078 * Returns the domainname which the specified PID is in on success,
1079 * empty string otherwise.
1080 * The PID is specified by tomoyo_write_pid() so that the user can obtain
1081 * using read()/write() interface rather than sysctl() interface.
1083 static int tomoyo_read_pid(struct tomoyo_io_buffer *head)
1085 if (head->read_avail == 0 && !head->read_eof) {
1086 const int pid = head->read_step;
1087 struct task_struct *p;
1088 struct tomoyo_domain_info *domain = NULL;
1090 read_lock(&tasklist_lock);
1091 p = find_task_by_vpid(pid);
1093 domain = tomoyo_real_domain(p);
1094 read_unlock(&tasklist_lock);
1097 tomoyo_io_printf(head, "%d %u %s", pid, domain->profile,
1098 domain->domainname->name);
1099 head->read_eof = true;
1105 * tomoyo_write_exception_policy - Write exception policy.
1107 * @head: Pointer to "struct tomoyo_io_buffer".
1109 * Returns 0 on success, negative value otherwise.
1111 * Caller holds tomoyo_read_lock().
1113 static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head)
1115 char *data = head->write_buf;
1116 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
1118 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_KEEP_DOMAIN))
1119 return tomoyo_write_domain_keeper_policy(data, false,
1121 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_KEEP_DOMAIN))
1122 return tomoyo_write_domain_keeper_policy(data, true, is_delete);
1123 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_INITIALIZE_DOMAIN))
1124 return tomoyo_write_domain_initializer_policy(data, false,
1126 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN))
1127 return tomoyo_write_domain_initializer_policy(data, true,
1129 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALIAS))
1130 return tomoyo_write_alias_policy(data, is_delete);
1131 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ))
1132 return tomoyo_write_globally_readable_policy(data, is_delete);
1133 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN))
1134 return tomoyo_write_pattern_policy(data, is_delete);
1135 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE))
1136 return tomoyo_write_no_rewrite_policy(data, is_delete);
1137 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_PATH_GROUP))
1138 return tomoyo_write_path_group_policy(data, is_delete);
1139 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NUMBER_GROUP))
1140 return tomoyo_write_number_group_policy(data, is_delete);
1145 * tomoyo_read_exception_policy - Read exception policy.
1147 * @head: Pointer to "struct tomoyo_io_buffer".
1149 * Returns 0 on success, -EINVAL otherwise.
1151 * Caller holds tomoyo_read_lock().
1153 static int tomoyo_read_exception_policy(struct tomoyo_io_buffer *head)
1155 if (!head->read_eof) {
1156 switch (head->read_step) {
1158 head->read_var2 = NULL;
1159 head->read_step = 1;
1161 if (!tomoyo_read_domain_keeper_policy(head))
1163 head->read_var2 = NULL;
1164 head->read_step = 2;
1166 if (!tomoyo_read_globally_readable_policy(head))
1168 head->read_var2 = NULL;
1169 head->read_step = 3;
1171 head->read_var2 = NULL;
1172 head->read_step = 4;
1174 if (!tomoyo_read_domain_initializer_policy(head))
1176 head->read_var2 = NULL;
1177 head->read_step = 5;
1179 if (!tomoyo_read_alias_policy(head))
1181 head->read_var2 = NULL;
1182 head->read_step = 6;
1184 head->read_var2 = NULL;
1185 head->read_step = 7;
1187 if (!tomoyo_read_file_pattern(head))
1189 head->read_var2 = NULL;
1190 head->read_step = 8;
1192 if (!tomoyo_read_no_rewrite_policy(head))
1194 head->read_var2 = NULL;
1195 head->read_step = 9;
1197 if (!tomoyo_read_path_group_policy(head))
1199 head->read_var1 = NULL;
1200 head->read_var2 = NULL;
1201 head->read_step = 10;
1203 if (!tomoyo_read_number_group_policy(head))
1205 head->read_var1 = NULL;
1206 head->read_var2 = NULL;
1207 head->read_step = 11;
1209 head->read_eof = true;
1219 * tomoyo_print_header - Get header line of audit log.
1221 * @r: Pointer to "struct tomoyo_request_info".
1223 * Returns string representation.
1225 * This function uses kmalloc(), so caller must kfree() if this function
1226 * didn't return NULL.
1228 static char *tomoyo_print_header(struct tomoyo_request_info *r)
1230 static const char *tomoyo_mode_4[4] = {
1231 "disabled", "learning", "permissive", "enforcing"
1234 const pid_t gpid = task_pid_nr(current);
1235 static const int tomoyo_buffer_len = 4096;
1236 char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS);
1239 do_gettimeofday(&tv);
1240 snprintf(buffer, tomoyo_buffer_len - 1,
1241 "#timestamp=%lu profile=%u mode=%s (global-pid=%u)"
1242 " task={ pid=%u ppid=%u uid=%u gid=%u euid=%u"
1243 " egid=%u suid=%u sgid=%u fsuid=%u fsgid=%u }",
1244 tv.tv_sec, r->profile, tomoyo_mode_4[r->mode], gpid,
1245 (pid_t) sys_getpid(), (pid_t) sys_getppid(),
1246 current_uid(), current_gid(), current_euid(),
1247 current_egid(), current_suid(), current_sgid(),
1248 current_fsuid(), current_fsgid());
1253 * tomoyo_init_audit_log - Allocate buffer for audit logs.
1255 * @len: Required size.
1256 * @r: Pointer to "struct tomoyo_request_info".
1258 * Returns pointer to allocated memory.
1260 * The @len is updated to add the header lines' size on success.
1262 * This function uses kzalloc(), so caller must kfree() if this function
1263 * didn't return NULL.
1265 static char *tomoyo_init_audit_log(int *len, struct tomoyo_request_info *r)
1269 const char *domainname;
1271 r->domain = tomoyo_domain();
1272 domainname = r->domain->domainname->name;
1273 header = tomoyo_print_header(r);
1276 *len += strlen(domainname) + strlen(header) + 10;
1277 buf = kzalloc(*len, GFP_NOFS);
1279 snprintf(buf, (*len) - 1, "%s\n%s\n", header, domainname);
1284 /* Wait queue for tomoyo_query_list. */
1285 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1287 /* Lock for manipulating tomoyo_query_list. */
1288 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1290 /* Structure for query. */
1291 struct tomoyo_query_entry {
1292 struct list_head list;
1295 unsigned int serial;
1300 /* The list for "struct tomoyo_query_entry". */
1301 static LIST_HEAD(tomoyo_query_list);
1304 * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1307 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1310 * tomoyo_supervisor - Ask for the supervisor's decision.
1312 * @r: Pointer to "struct tomoyo_request_info".
1313 * @fmt: The printf()'s format string, followed by parameters.
1315 * Returns 0 if the supervisor decided to permit the access request which
1316 * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1317 * supervisor decided to retry the access request which violated the policy in
1318 * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1320 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
1326 static unsigned int tomoyo_serial;
1327 struct tomoyo_query_entry *tomoyo_query_entry = NULL;
1328 bool quota_exceeded = false;
1332 case TOMOYO_CONFIG_LEARNING:
1333 if (!tomoyo_domain_quota_is_ok(r))
1335 va_start(args, fmt);
1336 len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 4;
1338 buffer = kmalloc(len, GFP_NOFS);
1341 va_start(args, fmt);
1342 vsnprintf(buffer, len - 1, fmt, args);
1344 tomoyo_normalize_line(buffer);
1345 tomoyo_write_domain_policy2(buffer, r->domain, false);
1348 case TOMOYO_CONFIG_PERMISSIVE:
1352 r->domain = tomoyo_domain();
1353 if (!atomic_read(&tomoyo_query_observers))
1355 va_start(args, fmt);
1356 len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 32;
1358 header = tomoyo_init_audit_log(&len, r);
1361 tomoyo_query_entry = kzalloc(sizeof(*tomoyo_query_entry), GFP_NOFS);
1362 if (!tomoyo_query_entry)
1364 tomoyo_query_entry->query = kzalloc(len, GFP_NOFS);
1365 if (!tomoyo_query_entry->query)
1367 len = ksize(tomoyo_query_entry->query);
1368 INIT_LIST_HEAD(&tomoyo_query_entry->list);
1369 spin_lock(&tomoyo_query_list_lock);
1370 if (tomoyo_quota_for_query && tomoyo_query_memory_size + len +
1371 sizeof(*tomoyo_query_entry) >= tomoyo_quota_for_query) {
1372 quota_exceeded = true;
1374 tomoyo_query_memory_size += len + sizeof(*tomoyo_query_entry);
1375 tomoyo_query_entry->serial = tomoyo_serial++;
1377 spin_unlock(&tomoyo_query_list_lock);
1380 pos = snprintf(tomoyo_query_entry->query, len - 1, "Q%u-%hu\n%s",
1381 tomoyo_query_entry->serial, r->retry, header);
1384 va_start(args, fmt);
1385 vsnprintf(tomoyo_query_entry->query + pos, len - 1 - pos, fmt, args);
1386 tomoyo_query_entry->query_len = strlen(tomoyo_query_entry->query) + 1;
1388 spin_lock(&tomoyo_query_list_lock);
1389 list_add_tail(&tomoyo_query_entry->list, &tomoyo_query_list);
1390 spin_unlock(&tomoyo_query_list_lock);
1391 /* Give 10 seconds for supervisor's opinion. */
1392 for (tomoyo_query_entry->timer = 0;
1393 atomic_read(&tomoyo_query_observers) && tomoyo_query_entry->timer < 100;
1394 tomoyo_query_entry->timer++) {
1395 wake_up(&tomoyo_query_wait);
1396 set_current_state(TASK_INTERRUPTIBLE);
1397 schedule_timeout(HZ / 10);
1398 if (tomoyo_query_entry->answer)
1401 spin_lock(&tomoyo_query_list_lock);
1402 list_del(&tomoyo_query_entry->list);
1403 tomoyo_query_memory_size -= len + sizeof(*tomoyo_query_entry);
1404 spin_unlock(&tomoyo_query_list_lock);
1405 switch (tomoyo_query_entry->answer) {
1406 case 3: /* Asked to retry by administrator. */
1407 error = TOMOYO_RETRY_REQUEST;
1411 /* Granted by administrator. */
1418 /* Rejected by administrator. */
1422 if (tomoyo_query_entry)
1423 kfree(tomoyo_query_entry->query);
1424 kfree(tomoyo_query_entry);
1430 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
1432 * @file: Pointer to "struct file".
1433 * @wait: Pointer to "poll_table".
1435 * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
1437 * Waits for access requests which violated policy in enforcing mode.
1439 static int tomoyo_poll_query(struct file *file, poll_table *wait)
1441 struct list_head *tmp;
1444 for (i = 0; i < 2; i++) {
1445 spin_lock(&tomoyo_query_list_lock);
1446 list_for_each(tmp, &tomoyo_query_list) {
1447 struct tomoyo_query_entry *ptr
1448 = list_entry(tmp, struct tomoyo_query_entry,
1455 spin_unlock(&tomoyo_query_list_lock);
1457 return POLLIN | POLLRDNORM;
1460 poll_wait(file, &tomoyo_query_wait, wait);
1466 * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
1468 * @head: Pointer to "struct tomoyo_io_buffer".
1472 static int tomoyo_read_query(struct tomoyo_io_buffer *head)
1474 struct list_head *tmp;
1478 if (head->read_avail)
1480 if (head->read_buf) {
1481 kfree(head->read_buf);
1482 head->read_buf = NULL;
1483 head->readbuf_size = 0;
1485 spin_lock(&tomoyo_query_list_lock);
1486 list_for_each(tmp, &tomoyo_query_list) {
1487 struct tomoyo_query_entry *ptr
1488 = list_entry(tmp, struct tomoyo_query_entry, list);
1491 if (pos++ != head->read_step)
1493 len = ptr->query_len;
1496 spin_unlock(&tomoyo_query_list_lock);
1498 head->read_step = 0;
1501 buf = kzalloc(len, GFP_NOFS);
1505 spin_lock(&tomoyo_query_list_lock);
1506 list_for_each(tmp, &tomoyo_query_list) {
1507 struct tomoyo_query_entry *ptr
1508 = list_entry(tmp, struct tomoyo_query_entry, list);
1511 if (pos++ != head->read_step)
1514 * Some query can be skipped because tomoyo_query_list
1515 * can change, but I don't care.
1517 if (len == ptr->query_len)
1518 memmove(buf, ptr->query, len);
1521 spin_unlock(&tomoyo_query_list_lock);
1523 head->read_avail = len;
1524 head->readbuf_size = head->read_avail;
1525 head->read_buf = buf;
1534 * tomoyo_write_answer - Write the supervisor's decision.
1536 * @head: Pointer to "struct tomoyo_io_buffer".
1538 * Returns 0 on success, -EINVAL otherwise.
1540 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
1542 char *data = head->write_buf;
1543 struct list_head *tmp;
1544 unsigned int serial;
1545 unsigned int answer;
1546 spin_lock(&tomoyo_query_list_lock);
1547 list_for_each(tmp, &tomoyo_query_list) {
1548 struct tomoyo_query_entry *ptr
1549 = list_entry(tmp, struct tomoyo_query_entry, list);
1552 spin_unlock(&tomoyo_query_list_lock);
1553 if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
1555 spin_lock(&tomoyo_query_list_lock);
1556 list_for_each(tmp, &tomoyo_query_list) {
1557 struct tomoyo_query_entry *ptr
1558 = list_entry(tmp, struct tomoyo_query_entry, list);
1559 if (ptr->serial != serial)
1562 ptr->answer = answer;
1565 spin_unlock(&tomoyo_query_list_lock);
1570 * tomoyo_read_version: Get version.
1572 * @head: Pointer to "struct tomoyo_io_buffer".
1574 * Returns version information.
1576 static int tomoyo_read_version(struct tomoyo_io_buffer *head)
1578 if (!head->read_eof) {
1579 tomoyo_io_printf(head, "2.2.0");
1580 head->read_eof = true;
1586 * tomoyo_read_self_domain - Get the current process's domainname.
1588 * @head: Pointer to "struct tomoyo_io_buffer".
1590 * Returns the current process's domainname.
1592 static int tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
1594 if (!head->read_eof) {
1596 * tomoyo_domain()->domainname != NULL
1597 * because every process belongs to a domain and
1598 * the domain's name cannot be NULL.
1600 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name);
1601 head->read_eof = true;
1607 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
1609 * @type: Type of interface.
1610 * @file: Pointer to "struct file".
1612 * Associates policy handler and returns 0 on success, -ENOMEM otherwise.
1614 * Caller acquires tomoyo_read_lock().
1616 int tomoyo_open_control(const u8 type, struct file *file)
1618 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
1622 mutex_init(&head->io_sem);
1625 case TOMOYO_DOMAINPOLICY:
1626 /* /sys/kernel/security/tomoyo/domain_policy */
1627 head->write = tomoyo_write_domain_policy;
1628 head->read = tomoyo_read_domain_policy;
1630 case TOMOYO_EXCEPTIONPOLICY:
1631 /* /sys/kernel/security/tomoyo/exception_policy */
1632 head->write = tomoyo_write_exception_policy;
1633 head->read = tomoyo_read_exception_policy;
1635 case TOMOYO_SELFDOMAIN:
1636 /* /sys/kernel/security/tomoyo/self_domain */
1637 head->read = tomoyo_read_self_domain;
1639 case TOMOYO_DOMAIN_STATUS:
1640 /* /sys/kernel/security/tomoyo/.domain_status */
1641 head->write = tomoyo_write_domain_profile;
1642 head->read = tomoyo_read_domain_profile;
1644 case TOMOYO_PROCESS_STATUS:
1645 /* /sys/kernel/security/tomoyo/.process_status */
1646 head->write = tomoyo_write_pid;
1647 head->read = tomoyo_read_pid;
1649 case TOMOYO_VERSION:
1650 /* /sys/kernel/security/tomoyo/version */
1651 head->read = tomoyo_read_version;
1652 head->readbuf_size = 128;
1654 case TOMOYO_MEMINFO:
1655 /* /sys/kernel/security/tomoyo/meminfo */
1656 head->write = tomoyo_write_memory_quota;
1657 head->read = tomoyo_read_memory_counter;
1658 head->readbuf_size = 512;
1660 case TOMOYO_PROFILE:
1661 /* /sys/kernel/security/tomoyo/profile */
1662 head->write = tomoyo_write_profile;
1663 head->read = tomoyo_read_profile;
1665 case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
1666 head->poll = tomoyo_poll_query;
1667 head->write = tomoyo_write_answer;
1668 head->read = tomoyo_read_query;
1670 case TOMOYO_MANAGER:
1671 /* /sys/kernel/security/tomoyo/manager */
1672 head->write = tomoyo_write_manager_policy;
1673 head->read = tomoyo_read_manager_policy;
1676 if (!(file->f_mode & FMODE_READ)) {
1678 * No need to allocate read_buf since it is not opened
1683 } else if (!head->poll) {
1684 /* Don't allocate read_buf for poll() access. */
1685 if (!head->readbuf_size)
1686 head->readbuf_size = 4096 * 2;
1687 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
1688 if (!head->read_buf) {
1693 if (!(file->f_mode & FMODE_WRITE)) {
1695 * No need to allocate write_buf since it is not opened
1699 } else if (head->write) {
1700 head->writebuf_size = 4096 * 2;
1701 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
1702 if (!head->write_buf) {
1703 kfree(head->read_buf);
1708 if (type != TOMOYO_QUERY)
1709 head->reader_idx = tomoyo_read_lock();
1710 file->private_data = head;
1712 * Call the handler now if the file is
1713 * /sys/kernel/security/tomoyo/self_domain
1714 * so that the user can use
1715 * cat < /sys/kernel/security/tomoyo/self_domain"
1716 * to know the current process's domainname.
1718 if (type == TOMOYO_SELFDOMAIN)
1719 tomoyo_read_control(file, NULL, 0);
1721 * If the file is /sys/kernel/security/tomoyo/query , increment the
1723 * The obserber counter is used by tomoyo_supervisor() to see if
1724 * there is some process monitoring /sys/kernel/security/tomoyo/query.
1726 else if (type == TOMOYO_QUERY)
1727 atomic_inc(&tomoyo_query_observers);
1732 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
1734 * @file: Pointer to "struct file".
1735 * @wait: Pointer to "poll_table".
1737 * Waits for read readiness.
1738 * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd .
1740 int tomoyo_poll_control(struct file *file, poll_table *wait)
1742 struct tomoyo_io_buffer *head = file->private_data;
1745 return head->poll(file, wait);
1749 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
1751 * @file: Pointer to "struct file".
1752 * @buffer: Poiner to buffer to write to.
1753 * @buffer_len: Size of @buffer.
1755 * Returns bytes read on success, negative value otherwise.
1757 * Caller holds tomoyo_read_lock().
1759 int tomoyo_read_control(struct file *file, char __user *buffer,
1760 const int buffer_len)
1763 struct tomoyo_io_buffer *head = file->private_data;
1768 if (mutex_lock_interruptible(&head->io_sem))
1770 /* Call the policy handler. */
1771 len = head->read(head);
1774 /* Write to buffer. */
1775 len = head->read_avail;
1776 if (len > buffer_len)
1780 /* head->read_buf changes by some functions. */
1781 cp = head->read_buf;
1782 if (copy_to_user(buffer, cp, len)) {
1786 head->read_avail -= len;
1787 memmove(cp, cp + len, head->read_avail);
1789 mutex_unlock(&head->io_sem);
1794 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
1796 * @file: Pointer to "struct file".
1797 * @buffer: Pointer to buffer to read from.
1798 * @buffer_len: Size of @buffer.
1800 * Returns @buffer_len on success, negative value otherwise.
1802 * Caller holds tomoyo_read_lock().
1804 int tomoyo_write_control(struct file *file, const char __user *buffer,
1805 const int buffer_len)
1807 struct tomoyo_io_buffer *head = file->private_data;
1808 int error = buffer_len;
1809 int avail_len = buffer_len;
1810 char *cp0 = head->write_buf;
1814 if (!access_ok(VERIFY_READ, buffer, buffer_len))
1816 /* Don't allow updating policies by non manager programs. */
1817 if (head->write != tomoyo_write_pid &&
1818 head->write != tomoyo_write_domain_policy &&
1819 !tomoyo_is_policy_manager())
1821 if (mutex_lock_interruptible(&head->io_sem))
1823 /* Read a line and dispatch it to the policy handler. */
1824 while (avail_len > 0) {
1826 if (head->write_avail >= head->writebuf_size - 1) {
1829 } else if (get_user(c, buffer)) {
1835 cp0[head->write_avail++] = c;
1838 cp0[head->write_avail - 1] = '\0';
1839 head->write_avail = 0;
1840 tomoyo_normalize_line(cp0);
1843 mutex_unlock(&head->io_sem);
1848 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
1850 * @file: Pointer to "struct file".
1852 * Releases memory and returns 0.
1854 * Caller looses tomoyo_read_lock().
1856 int tomoyo_close_control(struct file *file)
1858 struct tomoyo_io_buffer *head = file->private_data;
1859 const bool is_write = !!head->write_buf;
1862 * If the file is /sys/kernel/security/tomoyo/query , decrement the
1865 if (head->type == TOMOYO_QUERY)
1866 atomic_dec(&tomoyo_query_observers);
1868 tomoyo_read_unlock(head->reader_idx);
1869 /* Release memory used for policy I/O. */
1870 kfree(head->read_buf);
1871 head->read_buf = NULL;
1872 kfree(head->write_buf);
1873 head->write_buf = NULL;
1876 file->private_data = NULL;
1883 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
1885 void tomoyo_check_profile(void)
1887 struct tomoyo_domain_info *domain;
1888 const int idx = tomoyo_read_lock();
1889 tomoyo_policy_loaded = true;
1890 /* Check all profiles currently assigned to domains are defined. */
1891 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1892 const u8 profile = domain->profile;
1893 if (tomoyo_profile_ptr[profile])
1895 panic("Profile %u (used by '%s') not defined.\n",
1896 profile, domain->domainname->name);
1898 tomoyo_read_unlock(idx);
1899 printk(KERN_INFO "TOMOYO: 2.2.0 2009/04/01\n");
1900 printk(KERN_INFO "Mandatory Access Control activated.\n");