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[4] = {
32 "disabled", "learning", "permissive", "enforcing"
35 /* String table for /sys/kernel/security/tomoyo/profile */
36 static const char *tomoyo_mac_keywords[TOMOYO_MAX_MAC_INDEX
37 + TOMOYO_MAX_MAC_CATEGORY_INDEX] = {
38 [TOMOYO_MAC_FILE_EXECUTE] = "file::execute",
39 [TOMOYO_MAC_FILE_OPEN] = "file::open",
40 [TOMOYO_MAC_FILE_CREATE] = "file::create",
41 [TOMOYO_MAC_FILE_UNLINK] = "file::unlink",
42 [TOMOYO_MAC_FILE_MKDIR] = "file::mkdir",
43 [TOMOYO_MAC_FILE_RMDIR] = "file::rmdir",
44 [TOMOYO_MAC_FILE_MKFIFO] = "file::mkfifo",
45 [TOMOYO_MAC_FILE_MKSOCK] = "file::mksock",
46 [TOMOYO_MAC_FILE_TRUNCATE] = "file::truncate",
47 [TOMOYO_MAC_FILE_SYMLINK] = "file::symlink",
48 [TOMOYO_MAC_FILE_REWRITE] = "file::rewrite",
49 [TOMOYO_MAC_FILE_MKBLOCK] = "file::mkblock",
50 [TOMOYO_MAC_FILE_MKCHAR] = "file::mkchar",
51 [TOMOYO_MAC_FILE_LINK] = "file::link",
52 [TOMOYO_MAC_FILE_RENAME] = "file::rename",
53 [TOMOYO_MAC_FILE_CHMOD] = "file::chmod",
54 [TOMOYO_MAC_FILE_CHOWN] = "file::chown",
55 [TOMOYO_MAC_FILE_CHGRP] = "file::chgrp",
56 [TOMOYO_MAC_FILE_IOCTL] = "file::ioctl",
57 [TOMOYO_MAC_FILE_CHROOT] = "file::chroot",
58 [TOMOYO_MAC_FILE_MOUNT] = "file::mount",
59 [TOMOYO_MAC_FILE_UMOUNT] = "file::umount",
60 [TOMOYO_MAC_FILE_PIVOT_ROOT] = "file::pivot_root",
61 [TOMOYO_MAX_MAC_INDEX + TOMOYO_MAC_CATEGORY_FILE] = "file",
64 /* Permit policy management by non-root user? */
65 static bool tomoyo_manage_by_non_root;
67 /* Utility functions. */
70 * tomoyo_yesno - Return "yes" or "no".
74 static const char *tomoyo_yesno(const unsigned int value)
76 return value ? "yes" : "no";
80 * tomoyo_print_name_union - Print a tomoyo_name_union.
82 * @head: Pointer to "struct tomoyo_io_buffer".
83 * @ptr: Pointer to "struct tomoyo_name_union".
85 * Returns true on success, false otherwise.
87 static bool tomoyo_print_name_union(struct tomoyo_io_buffer *head,
88 const struct tomoyo_name_union *ptr)
90 int pos = head->read_avail;
91 if (pos && head->read_buf[pos - 1] == ' ')
94 return tomoyo_io_printf(head, " @%s",
95 ptr->group->group_name->name);
96 return tomoyo_io_printf(head, " %s", ptr->filename->name);
100 * tomoyo_print_number_union - Print a tomoyo_number_union.
102 * @head: Pointer to "struct tomoyo_io_buffer".
103 * @ptr: Pointer to "struct tomoyo_number_union".
105 * Returns true on success, false otherwise.
107 bool tomoyo_print_number_union(struct tomoyo_io_buffer *head,
108 const struct tomoyo_number_union *ptr)
114 if (!tomoyo_io_printf(head, " "))
117 return tomoyo_io_printf(head, "@%s",
118 ptr->group->group_name->name);
119 min_type = ptr->min_type;
120 max_type = ptr->max_type;
121 min = ptr->values[0];
122 max = ptr->values[1];
124 case TOMOYO_VALUE_TYPE_HEXADECIMAL:
125 if (!tomoyo_io_printf(head, "0x%lX", min))
128 case TOMOYO_VALUE_TYPE_OCTAL:
129 if (!tomoyo_io_printf(head, "0%lo", min))
133 if (!tomoyo_io_printf(head, "%lu", min))
137 if (min == max && min_type == max_type)
140 case TOMOYO_VALUE_TYPE_HEXADECIMAL:
141 return tomoyo_io_printf(head, "-0x%lX", max);
142 case TOMOYO_VALUE_TYPE_OCTAL:
143 return tomoyo_io_printf(head, "-0%lo", max);
145 return tomoyo_io_printf(head, "-%lu", max);
150 * tomoyo_io_printf - Transactional 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 * Returns true if output was written, false otherwise.
157 * The snprintf() will truncate, but tomoyo_io_printf() won't.
159 bool tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
163 int pos = head->read_avail;
164 int size = head->readbuf_size - pos;
169 len = vsnprintf(head->read_buf + pos, size, fmt, args);
171 if (pos + len >= head->readbuf_size)
173 head->read_avail += len;
178 * tomoyo_find_or_assign_new_profile - Create a new profile.
180 * @profile: Profile number to create.
182 * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
184 static struct tomoyo_profile *tomoyo_find_or_assign_new_profile
185 (const unsigned int profile)
187 struct tomoyo_profile *ptr;
188 struct tomoyo_profile *entry;
189 if (profile >= TOMOYO_MAX_PROFILES)
191 ptr = tomoyo_profile_ptr[profile];
194 entry = kzalloc(sizeof(*entry), GFP_NOFS);
195 if (mutex_lock_interruptible(&tomoyo_policy_lock))
197 ptr = tomoyo_profile_ptr[profile];
198 if (!ptr && tomoyo_memory_ok(entry)) {
200 ptr->learning = &tomoyo_default_profile.preference;
201 ptr->permissive = &tomoyo_default_profile.preference;
202 ptr->enforcing = &tomoyo_default_profile.preference;
203 ptr->default_config = TOMOYO_CONFIG_DISABLED;
204 memset(ptr->config, TOMOYO_CONFIG_USE_DEFAULT,
205 sizeof(ptr->config));
206 mb(); /* Avoid out-of-order execution. */
207 tomoyo_profile_ptr[profile] = ptr;
210 mutex_unlock(&tomoyo_policy_lock);
217 * tomoyo_profile - Find a profile.
219 * @profile: Profile number to find.
221 * Returns pointer to "struct tomoyo_profile".
223 struct tomoyo_profile *tomoyo_profile(const u8 profile)
225 struct tomoyo_profile *ptr = tomoyo_profile_ptr[profile];
226 if (!tomoyo_policy_loaded)
227 return &tomoyo_default_profile;
233 * tomoyo_write_profile - Write profile table.
235 * @head: Pointer to "struct tomoyo_io_buffer".
237 * Returns 0 on success, negative value otherwise.
239 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
241 char *data = head->write_buf;
246 bool use_default = false;
248 struct tomoyo_profile *profile;
249 if (sscanf(data, "PROFILE_VERSION=%u", &tomoyo_profile_version) == 1)
251 i = simple_strtoul(data, &cp, 10);
253 profile = &tomoyo_default_profile;
258 profile = tomoyo_find_or_assign_new_profile(i);
262 cp = strchr(data, '=');
266 if (profile != &tomoyo_default_profile)
267 use_default = strstr(cp, "use_default") != NULL;
268 if (strstr(cp, "verbose=yes"))
270 else if (strstr(cp, "verbose=no"))
274 if (!strcmp(data, "PREFERENCE::enforcing")) {
276 profile->enforcing = &tomoyo_default_profile.preference;
279 profile->enforcing = &profile->preference;
281 profile->preference.enforcing_verbose = value;
284 if (!strcmp(data, "PREFERENCE::permissive")) {
286 profile->permissive = &tomoyo_default_profile.preference;
289 profile->permissive = &profile->preference;
291 profile->preference.permissive_verbose = value;
294 if (!strcmp(data, "PREFERENCE::learning")) {
297 profile->learning = &tomoyo_default_profile.preference;
300 profile->learning = &profile->preference;
302 profile->preference.learning_verbose = value;
303 cp2 = strstr(cp, "max_entry=");
305 sscanf(cp2 + 10, "%u",
306 &profile->preference.learning_max_entry);
309 if (profile == &tomoyo_default_profile)
311 if (!strcmp(data, "COMMENT")) {
312 const struct tomoyo_path_info *old_comment = profile->comment;
313 profile->comment = tomoyo_get_name(cp);
314 tomoyo_put_name(old_comment);
317 if (!strcmp(data, "CONFIG")) {
318 i = TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX;
319 config = profile->default_config;
320 } else if (tomoyo_str_starts(&data, "CONFIG::")) {
322 for (i = 0; i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
323 if (strcmp(data, tomoyo_mac_keywords[i]))
325 config = profile->config[i];
328 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
334 config = TOMOYO_CONFIG_USE_DEFAULT;
336 for (mode = 3; mode >= 0; mode--)
337 if (strstr(cp, tomoyo_mode_4[mode]))
339 * Update lower 3 bits in order to distinguish
340 * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
342 config = (config & ~7) | mode;
344 if (i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
345 profile->config[i] = config;
346 else if (config != TOMOYO_CONFIG_USE_DEFAULT)
347 profile->default_config = config;
352 * tomoyo_read_profile - Read profile table.
354 * @head: Pointer to "struct tomoyo_io_buffer".
358 static int tomoyo_read_profile(struct tomoyo_io_buffer *head)
365 tomoyo_io_printf(head, "PROFILE_VERSION=%s\n", "20090903");
366 tomoyo_io_printf(head, "PREFERENCE::learning={ verbose=%s "
368 tomoyo_yesno(tomoyo_default_profile.preference.
370 tomoyo_default_profile.preference.learning_max_entry);
371 tomoyo_io_printf(head, "PREFERENCE::permissive={ verbose=%s }\n",
372 tomoyo_yesno(tomoyo_default_profile.preference.
373 permissive_verbose));
374 tomoyo_io_printf(head, "PREFERENCE::enforcing={ verbose=%s }\n",
375 tomoyo_yesno(tomoyo_default_profile.preference.
379 for (index = head->read_step; index < TOMOYO_MAX_PROFILES; index++) {
384 const struct tomoyo_profile *profile
385 = tomoyo_profile_ptr[index];
386 const struct tomoyo_path_info *comment;
387 head->read_step = index;
390 pos = head->read_avail;
391 comment = profile->comment;
392 done = tomoyo_io_printf(head, "%u-COMMENT=%s\n", index,
393 comment ? comment->name : "");
396 config = profile->default_config;
397 if (!tomoyo_io_printf(head, "%u-CONFIG={ mode=%s }\n", index,
398 tomoyo_mode_4[config & 3]))
400 for (i = 0; i < TOMOYO_MAX_MAC_INDEX +
401 TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
402 config = profile->config[i];
403 if (config == TOMOYO_CONFIG_USE_DEFAULT)
405 if (!tomoyo_io_printf(head,
406 "%u-CONFIG::%s={ mode=%s }\n",
407 index, tomoyo_mac_keywords[i],
408 tomoyo_mode_4[config & 3]))
411 if (profile->learning != &tomoyo_default_profile.preference &&
412 !tomoyo_io_printf(head, "%u-PREFERENCE::learning={ "
413 "verbose=%s max_entry=%u }\n", index,
414 tomoyo_yesno(profile->preference.
416 profile->preference.learning_max_entry))
418 if (profile->permissive != &tomoyo_default_profile.preference
419 && !tomoyo_io_printf(head, "%u-PREFERENCE::permissive={ "
420 "verbose=%s }\n", index,
421 tomoyo_yesno(profile->preference.
422 permissive_verbose)))
424 if (profile->enforcing != &tomoyo_default_profile.preference &&
425 !tomoyo_io_printf(head, "%u-PREFERENCE::enforcing={ "
426 "verbose=%s }\n", index,
427 tomoyo_yesno(profile->preference.
432 head->read_avail = pos;
435 if (index == TOMOYO_MAX_PROFILES)
436 head->read_eof = true;
441 * tomoyo_policy_manager_list is used for holding list of domainnames or
442 * programs which are permitted to modify configuration via
443 * /sys/kernel/security/tomoyo/ interface.
445 * An entry is added by
447 * # echo '<kernel> /sbin/mingetty /bin/login /bin/bash' > \
448 * /sys/kernel/security/tomoyo/manager
449 * (if you want to specify by a domainname)
453 * # echo '/usr/sbin/tomoyo-editpolicy' > /sys/kernel/security/tomoyo/manager
454 * (if you want to specify by a program's location)
458 * # echo 'delete <kernel> /sbin/mingetty /bin/login /bin/bash' > \
459 * /sys/kernel/security/tomoyo/manager
463 * # echo 'delete /usr/sbin/tomoyo-editpolicy' > \
464 * /sys/kernel/security/tomoyo/manager
466 * and all entries are retrieved by
468 * # cat /sys/kernel/security/tomoyo/manager
470 LIST_HEAD(tomoyo_policy_manager_list);
473 * tomoyo_update_manager_entry - Add a manager entry.
475 * @manager: The path to manager or the domainnamme.
476 * @is_delete: True if it is a delete request.
478 * Returns 0 on success, negative value otherwise.
480 * Caller holds tomoyo_read_lock().
482 static int tomoyo_update_manager_entry(const char *manager,
483 const bool is_delete)
485 struct tomoyo_policy_manager_entry *ptr;
486 struct tomoyo_policy_manager_entry e = { };
487 int error = is_delete ? -ENOENT : -ENOMEM;
489 if (tomoyo_is_domain_def(manager)) {
490 if (!tomoyo_is_correct_domain(manager))
494 if (!tomoyo_is_correct_path(manager))
497 e.manager = tomoyo_get_name(manager);
500 if (mutex_lock_interruptible(&tomoyo_policy_lock))
502 list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, head.list) {
503 if (ptr->manager != e.manager)
505 ptr->head.is_deleted = is_delete;
509 if (!is_delete && error) {
510 struct tomoyo_policy_manager_entry *entry =
511 tomoyo_commit_ok(&e, sizeof(e));
513 list_add_tail_rcu(&entry->head.list,
514 &tomoyo_policy_manager_list);
518 mutex_unlock(&tomoyo_policy_lock);
520 tomoyo_put_name(e.manager);
525 * tomoyo_write_manager_policy - Write manager policy.
527 * @head: Pointer to "struct tomoyo_io_buffer".
529 * Returns 0 on success, negative value otherwise.
531 * Caller holds tomoyo_read_lock().
533 static int tomoyo_write_manager_policy(struct tomoyo_io_buffer *head)
535 char *data = head->write_buf;
536 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
538 if (!strcmp(data, "manage_by_non_root")) {
539 tomoyo_manage_by_non_root = !is_delete;
542 return tomoyo_update_manager_entry(data, is_delete);
546 * tomoyo_read_manager_policy - Read manager policy.
548 * @head: Pointer to "struct tomoyo_io_buffer".
552 * Caller holds tomoyo_read_lock().
554 static int tomoyo_read_manager_policy(struct tomoyo_io_buffer *head)
556 struct list_head *pos;
561 list_for_each_cookie(pos, head->read_var2,
562 &tomoyo_policy_manager_list) {
563 struct tomoyo_policy_manager_entry *ptr;
564 ptr = list_entry(pos, struct tomoyo_policy_manager_entry,
566 if (ptr->head.is_deleted)
568 done = tomoyo_io_printf(head, "%s\n", ptr->manager->name);
572 head->read_eof = done;
577 * tomoyo_is_policy_manager - Check whether the current process is a policy manager.
579 * Returns true if the current process is permitted to modify policy
580 * via /sys/kernel/security/tomoyo/ interface.
582 * Caller holds tomoyo_read_lock().
584 static bool tomoyo_is_policy_manager(void)
586 struct tomoyo_policy_manager_entry *ptr;
588 const struct task_struct *task = current;
589 const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
592 if (!tomoyo_policy_loaded)
594 if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
596 list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, head.list) {
597 if (!ptr->head.is_deleted && ptr->is_domain
598 && !tomoyo_pathcmp(domainname, ptr->manager)) {
605 exe = tomoyo_get_exe();
608 list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, head.list) {
609 if (!ptr->head.is_deleted && !ptr->is_domain
610 && !strcmp(exe, ptr->manager->name)) {
615 if (!found) { /* Reduce error messages. */
616 static pid_t last_pid;
617 const pid_t pid = current->pid;
618 if (last_pid != pid) {
619 printk(KERN_WARNING "%s ( %s ) is not permitted to "
620 "update policies.\n", domainname->name, exe);
629 * tomoyo_is_select_one - Parse select command.
631 * @head: Pointer to "struct tomoyo_io_buffer".
632 * @data: String to parse.
634 * Returns true on success, false otherwise.
636 * Caller holds tomoyo_read_lock().
638 static bool tomoyo_is_select_one(struct tomoyo_io_buffer *head,
642 struct tomoyo_domain_info *domain = NULL;
643 bool global_pid = false;
645 if (sscanf(data, "pid=%u", &pid) == 1 ||
646 (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
647 struct task_struct *p;
649 read_lock(&tasklist_lock);
651 p = find_task_by_pid_ns(pid, &init_pid_ns);
653 p = find_task_by_vpid(pid);
655 domain = tomoyo_real_domain(p);
656 read_unlock(&tasklist_lock);
658 } else if (!strncmp(data, "domain=", 7)) {
659 if (tomoyo_is_domain_def(data + 7))
660 domain = tomoyo_find_domain(data + 7);
663 head->write_var1 = domain;
664 /* Accessing read_buf is safe because head->io_sem is held. */
666 return true; /* Do nothing if open(O_WRONLY). */
667 head->read_avail = 0;
668 tomoyo_io_printf(head, "# select %s\n", data);
669 head->read_single_domain = true;
670 head->read_eof = !domain;
672 struct tomoyo_domain_info *d;
673 head->read_var1 = NULL;
674 list_for_each_entry_rcu(d, &tomoyo_domain_list, list) {
677 head->read_var1 = &d->list;
679 head->read_var2 = NULL;
682 if (domain->is_deleted)
683 tomoyo_io_printf(head, "# This is a deleted domain.\n");
689 * tomoyo_delete_domain - Delete a domain.
691 * @domainname: The name of domain.
695 * Caller holds tomoyo_read_lock().
697 static int tomoyo_delete_domain(char *domainname)
699 struct tomoyo_domain_info *domain;
700 struct tomoyo_path_info name;
702 name.name = domainname;
703 tomoyo_fill_path_info(&name);
704 if (mutex_lock_interruptible(&tomoyo_policy_lock))
706 /* Is there an active domain? */
707 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
708 /* Never delete tomoyo_kernel_domain */
709 if (domain == &tomoyo_kernel_domain)
711 if (domain->is_deleted ||
712 tomoyo_pathcmp(domain->domainname, &name))
714 domain->is_deleted = true;
717 mutex_unlock(&tomoyo_policy_lock);
722 * tomoyo_write_domain_policy2 - Write domain policy.
724 * @head: Pointer to "struct tomoyo_io_buffer".
726 * Returns 0 on success, negative value otherwise.
728 * Caller holds tomoyo_read_lock().
730 static int tomoyo_write_domain_policy2(char *data,
731 struct tomoyo_domain_info *domain,
732 const bool is_delete)
734 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_MOUNT))
735 return tomoyo_write_mount_policy(data, domain, is_delete);
736 return tomoyo_write_file_policy(data, domain, is_delete);
740 * tomoyo_write_domain_policy - Write domain policy.
742 * @head: Pointer to "struct tomoyo_io_buffer".
744 * Returns 0 on success, negative value otherwise.
746 * Caller holds tomoyo_read_lock().
748 static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head)
750 char *data = head->write_buf;
751 struct tomoyo_domain_info *domain = head->write_var1;
752 bool is_delete = false;
753 bool is_select = false;
754 unsigned int profile;
756 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE))
758 else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT))
760 if (is_select && tomoyo_is_select_one(head, data))
762 /* Don't allow updating policies by non manager programs. */
763 if (!tomoyo_is_policy_manager())
765 if (tomoyo_is_domain_def(data)) {
768 tomoyo_delete_domain(data);
770 domain = tomoyo_find_domain(data);
772 domain = tomoyo_find_or_assign_new_domain(data, 0);
773 head->write_var1 = domain;
779 if (sscanf(data, TOMOYO_KEYWORD_USE_PROFILE "%u", &profile) == 1
780 && profile < TOMOYO_MAX_PROFILES) {
781 if (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded)
782 domain->profile = (u8) profile;
785 if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) {
786 domain->ignore_global_allow_read = !is_delete;
789 if (!strcmp(data, TOMOYO_KEYWORD_QUOTA_EXCEEDED)) {
790 domain->quota_warned = !is_delete;
793 if (!strcmp(data, TOMOYO_KEYWORD_TRANSITION_FAILED)) {
794 domain->transition_failed = !is_delete;
797 return tomoyo_write_domain_policy2(data, domain, is_delete);
801 * tomoyo_print_path_acl - Print a single path ACL entry.
803 * @head: Pointer to "struct tomoyo_io_buffer".
804 * @ptr: Pointer to "struct tomoyo_path_acl".
806 * Returns true on success, false otherwise.
808 static bool tomoyo_print_path_acl(struct tomoyo_io_buffer *head,
809 struct tomoyo_path_acl *ptr)
813 const u16 perm = ptr->perm;
815 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
816 if (!(perm & (1 << bit)))
818 /* Print "read/write" instead of "read" and "write". */
819 if ((bit == TOMOYO_TYPE_READ || bit == TOMOYO_TYPE_WRITE)
820 && (perm & (1 << TOMOYO_TYPE_READ_WRITE)))
822 pos = head->read_avail;
823 if (!tomoyo_io_printf(head, "allow_%s ",
824 tomoyo_path2keyword(bit)) ||
825 !tomoyo_print_name_union(head, &ptr->name) ||
826 !tomoyo_io_printf(head, "\n"))
832 head->read_bit = bit;
833 head->read_avail = pos;
838 * tomoyo_print_path2_acl - Print a double path ACL entry.
840 * @head: Pointer to "struct tomoyo_io_buffer".
841 * @ptr: Pointer to "struct tomoyo_path2_acl".
843 * Returns true on success, false otherwise.
845 static bool tomoyo_print_path2_acl(struct tomoyo_io_buffer *head,
846 struct tomoyo_path2_acl *ptr)
849 const u8 perm = ptr->perm;
852 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
853 if (!(perm & (1 << bit)))
855 pos = head->read_avail;
856 if (!tomoyo_io_printf(head, "allow_%s ",
857 tomoyo_path22keyword(bit)) ||
858 !tomoyo_print_name_union(head, &ptr->name1) ||
859 !tomoyo_print_name_union(head, &ptr->name2) ||
860 !tomoyo_io_printf(head, "\n"))
866 head->read_bit = bit;
867 head->read_avail = pos;
872 * tomoyo_print_path_number_acl - Print a path_number ACL entry.
874 * @head: Pointer to "struct tomoyo_io_buffer".
875 * @ptr: Pointer to "struct tomoyo_path_number_acl".
877 * Returns true on success, false otherwise.
879 static bool tomoyo_print_path_number_acl(struct tomoyo_io_buffer *head,
880 struct tomoyo_path_number_acl *ptr)
884 const u8 perm = ptr->perm;
885 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION;
887 if (!(perm & (1 << bit)))
889 pos = head->read_avail;
890 if (!tomoyo_io_printf(head, "allow_%s",
891 tomoyo_path_number2keyword(bit)) ||
892 !tomoyo_print_name_union(head, &ptr->name) ||
893 !tomoyo_print_number_union(head, &ptr->number) ||
894 !tomoyo_io_printf(head, "\n"))
900 head->read_bit = bit;
901 head->read_avail = pos;
906 * tomoyo_print_path_number3_acl - Print a path_number3 ACL entry.
908 * @head: Pointer to "struct tomoyo_io_buffer".
909 * @ptr: Pointer to "struct tomoyo_path_number3_acl".
911 * Returns true on success, false otherwise.
913 static bool tomoyo_print_path_number3_acl(struct tomoyo_io_buffer *head,
914 struct tomoyo_path_number3_acl *ptr)
918 const u16 perm = ptr->perm;
919 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER3_OPERATION;
921 if (!(perm & (1 << bit)))
923 pos = head->read_avail;
924 if (!tomoyo_io_printf(head, "allow_%s",
925 tomoyo_path_number32keyword(bit)) ||
926 !tomoyo_print_name_union(head, &ptr->name) ||
927 !tomoyo_print_number_union(head, &ptr->mode) ||
928 !tomoyo_print_number_union(head, &ptr->major) ||
929 !tomoyo_print_number_union(head, &ptr->minor) ||
930 !tomoyo_io_printf(head, "\n"))
936 head->read_bit = bit;
937 head->read_avail = pos;
942 * tomoyo_print_mount_acl - Print a mount ACL entry.
944 * @head: Pointer to "struct tomoyo_io_buffer".
945 * @ptr: Pointer to "struct tomoyo_mount_acl".
947 * Returns true on success, false otherwise.
949 static bool tomoyo_print_mount_acl(struct tomoyo_io_buffer *head,
950 struct tomoyo_mount_acl *ptr)
952 const int pos = head->read_avail;
953 if (!tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_MOUNT) ||
954 !tomoyo_print_name_union(head, &ptr->dev_name) ||
955 !tomoyo_print_name_union(head, &ptr->dir_name) ||
956 !tomoyo_print_name_union(head, &ptr->fs_type) ||
957 !tomoyo_print_number_union(head, &ptr->flags) ||
958 !tomoyo_io_printf(head, "\n")) {
959 head->read_avail = pos;
966 * tomoyo_print_entry - Print an ACL entry.
968 * @head: Pointer to "struct tomoyo_io_buffer".
969 * @ptr: Pointer to an ACL entry.
971 * Returns true on success, false otherwise.
973 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
974 struct tomoyo_acl_info *ptr)
976 const u8 acl_type = ptr->type;
980 if (acl_type == TOMOYO_TYPE_PATH_ACL) {
981 struct tomoyo_path_acl *acl
982 = container_of(ptr, struct tomoyo_path_acl, head);
983 return tomoyo_print_path_acl(head, acl);
985 if (acl_type == TOMOYO_TYPE_PATH2_ACL) {
986 struct tomoyo_path2_acl *acl
987 = container_of(ptr, struct tomoyo_path2_acl, head);
988 return tomoyo_print_path2_acl(head, acl);
990 if (acl_type == TOMOYO_TYPE_PATH_NUMBER_ACL) {
991 struct tomoyo_path_number_acl *acl
992 = container_of(ptr, struct tomoyo_path_number_acl,
994 return tomoyo_print_path_number_acl(head, acl);
996 if (acl_type == TOMOYO_TYPE_PATH_NUMBER3_ACL) {
997 struct tomoyo_path_number3_acl *acl
998 = container_of(ptr, struct tomoyo_path_number3_acl,
1000 return tomoyo_print_path_number3_acl(head, acl);
1002 if (acl_type == TOMOYO_TYPE_MOUNT_ACL) {
1003 struct tomoyo_mount_acl *acl
1004 = container_of(ptr, struct tomoyo_mount_acl, head);
1005 return tomoyo_print_mount_acl(head, acl);
1007 BUG(); /* This must not happen. */
1012 * tomoyo_read_domain_policy - Read domain policy.
1014 * @head: Pointer to "struct tomoyo_io_buffer".
1018 * Caller holds tomoyo_read_lock().
1020 static int tomoyo_read_domain_policy(struct tomoyo_io_buffer *head)
1022 struct list_head *dpos;
1023 struct list_head *apos;
1028 if (head->read_step == 0)
1029 head->read_step = 1;
1030 list_for_each_cookie(dpos, head->read_var1, &tomoyo_domain_list) {
1031 struct tomoyo_domain_info *domain;
1032 const char *quota_exceeded = "";
1033 const char *transition_failed = "";
1034 const char *ignore_global_allow_read = "";
1035 domain = list_entry(dpos, struct tomoyo_domain_info, list);
1036 if (head->read_step != 1)
1038 if (domain->is_deleted && !head->read_single_domain)
1040 /* Print domainname and flags. */
1041 if (domain->quota_warned)
1042 quota_exceeded = "quota_exceeded\n";
1043 if (domain->transition_failed)
1044 transition_failed = "transition_failed\n";
1045 if (domain->ignore_global_allow_read)
1046 ignore_global_allow_read
1047 = TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n";
1048 done = tomoyo_io_printf(head, "%s\n" TOMOYO_KEYWORD_USE_PROFILE
1050 domain->domainname->name,
1051 domain->profile, quota_exceeded,
1053 ignore_global_allow_read);
1056 head->read_step = 2;
1058 if (head->read_step == 3)
1060 /* Print ACL entries in the domain. */
1061 list_for_each_cookie(apos, head->read_var2,
1062 &domain->acl_info_list) {
1063 struct tomoyo_acl_info *ptr
1064 = list_entry(apos, struct tomoyo_acl_info,
1066 done = tomoyo_print_entry(head, ptr);
1072 head->read_step = 3;
1074 done = tomoyo_io_printf(head, "\n");
1077 head->read_step = 1;
1078 if (head->read_single_domain)
1081 head->read_eof = done;
1086 * tomoyo_write_domain_profile - Assign profile for specified domain.
1088 * @head: Pointer to "struct tomoyo_io_buffer".
1090 * Returns 0 on success, -EINVAL otherwise.
1092 * This is equivalent to doing
1094 * ( echo "select " $domainname; echo "use_profile " $profile ) |
1095 * /usr/sbin/tomoyo-loadpolicy -d
1097 * Caller holds tomoyo_read_lock().
1099 static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head)
1101 char *data = head->write_buf;
1102 char *cp = strchr(data, ' ');
1103 struct tomoyo_domain_info *domain;
1104 unsigned long profile;
1109 domain = tomoyo_find_domain(cp + 1);
1110 if (strict_strtoul(data, 10, &profile))
1112 if (domain && profile < TOMOYO_MAX_PROFILES
1113 && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded))
1114 domain->profile = (u8) profile;
1119 * tomoyo_read_domain_profile - Read only domainname and profile.
1121 * @head: Pointer to "struct tomoyo_io_buffer".
1123 * Returns list of profile number and domainname pairs.
1125 * This is equivalent to doing
1127 * grep -A 1 '^<kernel>' /sys/kernel/security/tomoyo/domain_policy |
1128 * awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" )
1129 * domainname = $0; } else if ( $1 == "use_profile" ) {
1130 * print $2 " " domainname; domainname = ""; } } ; '
1132 * Caller holds tomoyo_read_lock().
1134 static int tomoyo_read_domain_profile(struct tomoyo_io_buffer *head)
1136 struct list_head *pos;
1141 list_for_each_cookie(pos, head->read_var1, &tomoyo_domain_list) {
1142 struct tomoyo_domain_info *domain;
1143 domain = list_entry(pos, struct tomoyo_domain_info, list);
1144 if (domain->is_deleted)
1146 done = tomoyo_io_printf(head, "%u %s\n", domain->profile,
1147 domain->domainname->name);
1151 head->read_eof = done;
1156 * tomoyo_write_pid: Specify PID to obtain domainname.
1158 * @head: Pointer to "struct tomoyo_io_buffer".
1162 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1165 /* No error check. */
1166 strict_strtoul(head->write_buf, 10, &pid);
1167 head->read_step = (int) pid;
1168 head->read_eof = false;
1173 * tomoyo_read_pid - Get domainname of the specified PID.
1175 * @head: Pointer to "struct tomoyo_io_buffer".
1177 * Returns the domainname which the specified PID is in on success,
1178 * empty string otherwise.
1179 * The PID is specified by tomoyo_write_pid() so that the user can obtain
1180 * using read()/write() interface rather than sysctl() interface.
1182 static int tomoyo_read_pid(struct tomoyo_io_buffer *head)
1184 if (head->read_avail == 0 && !head->read_eof) {
1185 const int pid = head->read_step;
1186 struct task_struct *p;
1187 struct tomoyo_domain_info *domain = NULL;
1189 read_lock(&tasklist_lock);
1190 p = find_task_by_vpid(pid);
1192 domain = tomoyo_real_domain(p);
1193 read_unlock(&tasklist_lock);
1196 tomoyo_io_printf(head, "%d %u %s", pid, domain->profile,
1197 domain->domainname->name);
1198 head->read_eof = true;
1204 * tomoyo_write_exception_policy - Write exception policy.
1206 * @head: Pointer to "struct tomoyo_io_buffer".
1208 * Returns 0 on success, negative value otherwise.
1210 * Caller holds tomoyo_read_lock().
1212 static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head)
1214 char *data = head->write_buf;
1215 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
1217 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_KEEP_DOMAIN))
1218 return tomoyo_write_domain_keeper_policy(data, false,
1220 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_KEEP_DOMAIN))
1221 return tomoyo_write_domain_keeper_policy(data, true, is_delete);
1222 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_INITIALIZE_DOMAIN))
1223 return tomoyo_write_domain_initializer_policy(data, false,
1225 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN))
1226 return tomoyo_write_domain_initializer_policy(data, true,
1228 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_AGGREGATOR))
1229 return tomoyo_write_aggregator_policy(data, is_delete);
1230 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALIAS))
1231 return tomoyo_write_alias_policy(data, is_delete);
1232 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_ALLOW_READ))
1233 return tomoyo_write_globally_readable_policy(data, is_delete);
1234 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_FILE_PATTERN))
1235 return tomoyo_write_pattern_policy(data, is_delete);
1236 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DENY_REWRITE))
1237 return tomoyo_write_no_rewrite_policy(data, is_delete);
1238 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_PATH_GROUP))
1239 return tomoyo_write_path_group_policy(data, is_delete);
1240 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NUMBER_GROUP))
1241 return tomoyo_write_number_group_policy(data, is_delete);
1246 * tomoyo_read_exception_policy - Read exception policy.
1248 * @head: Pointer to "struct tomoyo_io_buffer".
1250 * Returns 0 on success, -EINVAL otherwise.
1252 * Caller holds tomoyo_read_lock().
1254 static int tomoyo_read_exception_policy(struct tomoyo_io_buffer *head)
1256 if (!head->read_eof) {
1257 switch (head->read_step) {
1259 head->read_var2 = NULL;
1260 head->read_step = 1;
1262 if (!tomoyo_read_domain_keeper_policy(head))
1264 head->read_var2 = NULL;
1265 head->read_step = 2;
1267 if (!tomoyo_read_globally_readable_policy(head))
1269 head->read_var2 = NULL;
1270 head->read_step = 3;
1272 head->read_var2 = NULL;
1273 head->read_step = 4;
1275 if (!tomoyo_read_domain_initializer_policy(head))
1277 head->read_var2 = NULL;
1278 head->read_step = 5;
1280 if (!tomoyo_read_alias_policy(head))
1282 head->read_var2 = NULL;
1283 head->read_step = 6;
1285 if (!tomoyo_read_aggregator_policy(head))
1287 head->read_var2 = NULL;
1288 head->read_step = 7;
1290 if (!tomoyo_read_file_pattern(head))
1292 head->read_var2 = NULL;
1293 head->read_step = 8;
1295 if (!tomoyo_read_no_rewrite_policy(head))
1297 head->read_var2 = NULL;
1298 head->read_step = 9;
1300 if (!tomoyo_read_path_group_policy(head))
1302 head->read_var1 = NULL;
1303 head->read_var2 = NULL;
1304 head->read_step = 10;
1306 if (!tomoyo_read_number_group_policy(head))
1308 head->read_var1 = NULL;
1309 head->read_var2 = NULL;
1310 head->read_step = 11;
1312 head->read_eof = true;
1322 * tomoyo_print_header - Get header line of audit log.
1324 * @r: Pointer to "struct tomoyo_request_info".
1326 * Returns string representation.
1328 * This function uses kmalloc(), so caller must kfree() if this function
1329 * didn't return NULL.
1331 static char *tomoyo_print_header(struct tomoyo_request_info *r)
1333 static const char *tomoyo_mode_4[4] = {
1334 "disabled", "learning", "permissive", "enforcing"
1337 const pid_t gpid = task_pid_nr(current);
1338 static const int tomoyo_buffer_len = 4096;
1339 char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS);
1342 do_gettimeofday(&tv);
1343 snprintf(buffer, tomoyo_buffer_len - 1,
1344 "#timestamp=%lu profile=%u mode=%s (global-pid=%u)"
1345 " task={ pid=%u ppid=%u uid=%u gid=%u euid=%u"
1346 " egid=%u suid=%u sgid=%u fsuid=%u fsgid=%u }",
1347 tv.tv_sec, r->profile, tomoyo_mode_4[r->mode], gpid,
1348 (pid_t) sys_getpid(), (pid_t) sys_getppid(),
1349 current_uid(), current_gid(), current_euid(),
1350 current_egid(), current_suid(), current_sgid(),
1351 current_fsuid(), current_fsgid());
1356 * tomoyo_init_audit_log - Allocate buffer for audit logs.
1358 * @len: Required size.
1359 * @r: Pointer to "struct tomoyo_request_info".
1361 * Returns pointer to allocated memory.
1363 * The @len is updated to add the header lines' size on success.
1365 * This function uses kzalloc(), so caller must kfree() if this function
1366 * didn't return NULL.
1368 static char *tomoyo_init_audit_log(int *len, struct tomoyo_request_info *r)
1372 const char *domainname;
1374 r->domain = tomoyo_domain();
1375 domainname = r->domain->domainname->name;
1376 header = tomoyo_print_header(r);
1379 *len += strlen(domainname) + strlen(header) + 10;
1380 buf = kzalloc(*len, GFP_NOFS);
1382 snprintf(buf, (*len) - 1, "%s\n%s\n", header, domainname);
1387 /* Wait queue for tomoyo_query_list. */
1388 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1390 /* Lock for manipulating tomoyo_query_list. */
1391 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1393 /* Structure for query. */
1394 struct tomoyo_query_entry {
1395 struct list_head list;
1398 unsigned int serial;
1403 /* The list for "struct tomoyo_query_entry". */
1404 static LIST_HEAD(tomoyo_query_list);
1407 * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1410 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1413 * tomoyo_supervisor - Ask for the supervisor's decision.
1415 * @r: Pointer to "struct tomoyo_request_info".
1416 * @fmt: The printf()'s format string, followed by parameters.
1418 * Returns 0 if the supervisor decided to permit the access request which
1419 * violated the policy in enforcing mode, TOMOYO_RETRY_REQUEST if the
1420 * supervisor decided to retry the access request which violated the policy in
1421 * enforcing mode, 0 if it is not in enforcing mode, -EPERM otherwise.
1423 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
1429 static unsigned int tomoyo_serial;
1430 struct tomoyo_query_entry *tomoyo_query_entry = NULL;
1431 bool quota_exceeded = false;
1435 case TOMOYO_CONFIG_LEARNING:
1436 if (!tomoyo_domain_quota_is_ok(r))
1438 va_start(args, fmt);
1439 len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 4;
1441 buffer = kmalloc(len, GFP_NOFS);
1444 va_start(args, fmt);
1445 vsnprintf(buffer, len - 1, fmt, args);
1447 tomoyo_normalize_line(buffer);
1448 tomoyo_write_domain_policy2(buffer, r->domain, false);
1451 case TOMOYO_CONFIG_PERMISSIVE:
1455 r->domain = tomoyo_domain();
1456 if (!atomic_read(&tomoyo_query_observers))
1458 va_start(args, fmt);
1459 len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 32;
1461 header = tomoyo_init_audit_log(&len, r);
1464 tomoyo_query_entry = kzalloc(sizeof(*tomoyo_query_entry), GFP_NOFS);
1465 if (!tomoyo_query_entry)
1467 tomoyo_query_entry->query = kzalloc(len, GFP_NOFS);
1468 if (!tomoyo_query_entry->query)
1470 len = ksize(tomoyo_query_entry->query);
1471 INIT_LIST_HEAD(&tomoyo_query_entry->list);
1472 spin_lock(&tomoyo_query_list_lock);
1473 if (tomoyo_quota_for_query && tomoyo_query_memory_size + len +
1474 sizeof(*tomoyo_query_entry) >= tomoyo_quota_for_query) {
1475 quota_exceeded = true;
1477 tomoyo_query_memory_size += len + sizeof(*tomoyo_query_entry);
1478 tomoyo_query_entry->serial = tomoyo_serial++;
1480 spin_unlock(&tomoyo_query_list_lock);
1483 pos = snprintf(tomoyo_query_entry->query, len - 1, "Q%u-%hu\n%s",
1484 tomoyo_query_entry->serial, r->retry, header);
1487 va_start(args, fmt);
1488 vsnprintf(tomoyo_query_entry->query + pos, len - 1 - pos, fmt, args);
1489 tomoyo_query_entry->query_len = strlen(tomoyo_query_entry->query) + 1;
1491 spin_lock(&tomoyo_query_list_lock);
1492 list_add_tail(&tomoyo_query_entry->list, &tomoyo_query_list);
1493 spin_unlock(&tomoyo_query_list_lock);
1494 /* Give 10 seconds for supervisor's opinion. */
1495 for (tomoyo_query_entry->timer = 0;
1496 atomic_read(&tomoyo_query_observers) && tomoyo_query_entry->timer < 100;
1497 tomoyo_query_entry->timer++) {
1498 wake_up(&tomoyo_query_wait);
1499 set_current_state(TASK_INTERRUPTIBLE);
1500 schedule_timeout(HZ / 10);
1501 if (tomoyo_query_entry->answer)
1504 spin_lock(&tomoyo_query_list_lock);
1505 list_del(&tomoyo_query_entry->list);
1506 tomoyo_query_memory_size -= len + sizeof(*tomoyo_query_entry);
1507 spin_unlock(&tomoyo_query_list_lock);
1508 switch (tomoyo_query_entry->answer) {
1509 case 3: /* Asked to retry by administrator. */
1510 error = TOMOYO_RETRY_REQUEST;
1514 /* Granted by administrator. */
1521 /* Rejected by administrator. */
1525 if (tomoyo_query_entry)
1526 kfree(tomoyo_query_entry->query);
1527 kfree(tomoyo_query_entry);
1533 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
1535 * @file: Pointer to "struct file".
1536 * @wait: Pointer to "poll_table".
1538 * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
1540 * Waits for access requests which violated policy in enforcing mode.
1542 static int tomoyo_poll_query(struct file *file, poll_table *wait)
1544 struct list_head *tmp;
1547 for (i = 0; i < 2; i++) {
1548 spin_lock(&tomoyo_query_list_lock);
1549 list_for_each(tmp, &tomoyo_query_list) {
1550 struct tomoyo_query_entry *ptr
1551 = list_entry(tmp, struct tomoyo_query_entry,
1558 spin_unlock(&tomoyo_query_list_lock);
1560 return POLLIN | POLLRDNORM;
1563 poll_wait(file, &tomoyo_query_wait, wait);
1569 * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
1571 * @head: Pointer to "struct tomoyo_io_buffer".
1575 static int tomoyo_read_query(struct tomoyo_io_buffer *head)
1577 struct list_head *tmp;
1581 if (head->read_avail)
1583 if (head->read_buf) {
1584 kfree(head->read_buf);
1585 head->read_buf = NULL;
1586 head->readbuf_size = 0;
1588 spin_lock(&tomoyo_query_list_lock);
1589 list_for_each(tmp, &tomoyo_query_list) {
1590 struct tomoyo_query_entry *ptr
1591 = list_entry(tmp, struct tomoyo_query_entry, list);
1594 if (pos++ != head->read_step)
1596 len = ptr->query_len;
1599 spin_unlock(&tomoyo_query_list_lock);
1601 head->read_step = 0;
1604 buf = kzalloc(len, GFP_NOFS);
1608 spin_lock(&tomoyo_query_list_lock);
1609 list_for_each(tmp, &tomoyo_query_list) {
1610 struct tomoyo_query_entry *ptr
1611 = list_entry(tmp, struct tomoyo_query_entry, list);
1614 if (pos++ != head->read_step)
1617 * Some query can be skipped because tomoyo_query_list
1618 * can change, but I don't care.
1620 if (len == ptr->query_len)
1621 memmove(buf, ptr->query, len);
1624 spin_unlock(&tomoyo_query_list_lock);
1626 head->read_avail = len;
1627 head->readbuf_size = head->read_avail;
1628 head->read_buf = buf;
1637 * tomoyo_write_answer - Write the supervisor's decision.
1639 * @head: Pointer to "struct tomoyo_io_buffer".
1641 * Returns 0 on success, -EINVAL otherwise.
1643 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
1645 char *data = head->write_buf;
1646 struct list_head *tmp;
1647 unsigned int serial;
1648 unsigned int answer;
1649 spin_lock(&tomoyo_query_list_lock);
1650 list_for_each(tmp, &tomoyo_query_list) {
1651 struct tomoyo_query_entry *ptr
1652 = list_entry(tmp, struct tomoyo_query_entry, list);
1655 spin_unlock(&tomoyo_query_list_lock);
1656 if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
1658 spin_lock(&tomoyo_query_list_lock);
1659 list_for_each(tmp, &tomoyo_query_list) {
1660 struct tomoyo_query_entry *ptr
1661 = list_entry(tmp, struct tomoyo_query_entry, list);
1662 if (ptr->serial != serial)
1665 ptr->answer = answer;
1668 spin_unlock(&tomoyo_query_list_lock);
1673 * tomoyo_read_version: Get version.
1675 * @head: Pointer to "struct tomoyo_io_buffer".
1677 * Returns version information.
1679 static int tomoyo_read_version(struct tomoyo_io_buffer *head)
1681 if (!head->read_eof) {
1682 tomoyo_io_printf(head, "2.3.0-pre");
1683 head->read_eof = true;
1689 * tomoyo_read_self_domain - Get the current process's domainname.
1691 * @head: Pointer to "struct tomoyo_io_buffer".
1693 * Returns the current process's domainname.
1695 static int tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
1697 if (!head->read_eof) {
1699 * tomoyo_domain()->domainname != NULL
1700 * because every process belongs to a domain and
1701 * the domain's name cannot be NULL.
1703 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name);
1704 head->read_eof = true;
1710 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
1712 * @type: Type of interface.
1713 * @file: Pointer to "struct file".
1715 * Associates policy handler and returns 0 on success, -ENOMEM otherwise.
1717 * Caller acquires tomoyo_read_lock().
1719 int tomoyo_open_control(const u8 type, struct file *file)
1721 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
1725 mutex_init(&head->io_sem);
1728 case TOMOYO_DOMAINPOLICY:
1729 /* /sys/kernel/security/tomoyo/domain_policy */
1730 head->write = tomoyo_write_domain_policy;
1731 head->read = tomoyo_read_domain_policy;
1733 case TOMOYO_EXCEPTIONPOLICY:
1734 /* /sys/kernel/security/tomoyo/exception_policy */
1735 head->write = tomoyo_write_exception_policy;
1736 head->read = tomoyo_read_exception_policy;
1738 case TOMOYO_SELFDOMAIN:
1739 /* /sys/kernel/security/tomoyo/self_domain */
1740 head->read = tomoyo_read_self_domain;
1742 case TOMOYO_DOMAIN_STATUS:
1743 /* /sys/kernel/security/tomoyo/.domain_status */
1744 head->write = tomoyo_write_domain_profile;
1745 head->read = tomoyo_read_domain_profile;
1747 case TOMOYO_PROCESS_STATUS:
1748 /* /sys/kernel/security/tomoyo/.process_status */
1749 head->write = tomoyo_write_pid;
1750 head->read = tomoyo_read_pid;
1752 case TOMOYO_VERSION:
1753 /* /sys/kernel/security/tomoyo/version */
1754 head->read = tomoyo_read_version;
1755 head->readbuf_size = 128;
1757 case TOMOYO_MEMINFO:
1758 /* /sys/kernel/security/tomoyo/meminfo */
1759 head->write = tomoyo_write_memory_quota;
1760 head->read = tomoyo_read_memory_counter;
1761 head->readbuf_size = 512;
1763 case TOMOYO_PROFILE:
1764 /* /sys/kernel/security/tomoyo/profile */
1765 head->write = tomoyo_write_profile;
1766 head->read = tomoyo_read_profile;
1768 case TOMOYO_QUERY: /* /sys/kernel/security/tomoyo/query */
1769 head->poll = tomoyo_poll_query;
1770 head->write = tomoyo_write_answer;
1771 head->read = tomoyo_read_query;
1773 case TOMOYO_MANAGER:
1774 /* /sys/kernel/security/tomoyo/manager */
1775 head->write = tomoyo_write_manager_policy;
1776 head->read = tomoyo_read_manager_policy;
1779 if (!(file->f_mode & FMODE_READ)) {
1781 * No need to allocate read_buf since it is not opened
1786 } else if (!head->poll) {
1787 /* Don't allocate read_buf for poll() access. */
1788 if (!head->readbuf_size)
1789 head->readbuf_size = 4096 * 2;
1790 head->read_buf = kzalloc(head->readbuf_size, GFP_NOFS);
1791 if (!head->read_buf) {
1796 if (!(file->f_mode & FMODE_WRITE)) {
1798 * No need to allocate write_buf since it is not opened
1802 } else if (head->write) {
1803 head->writebuf_size = 4096 * 2;
1804 head->write_buf = kzalloc(head->writebuf_size, GFP_NOFS);
1805 if (!head->write_buf) {
1806 kfree(head->read_buf);
1811 if (type != TOMOYO_QUERY)
1812 head->reader_idx = tomoyo_read_lock();
1813 file->private_data = head;
1815 * Call the handler now if the file is
1816 * /sys/kernel/security/tomoyo/self_domain
1817 * so that the user can use
1818 * cat < /sys/kernel/security/tomoyo/self_domain"
1819 * to know the current process's domainname.
1821 if (type == TOMOYO_SELFDOMAIN)
1822 tomoyo_read_control(file, NULL, 0);
1824 * If the file is /sys/kernel/security/tomoyo/query , increment the
1826 * The obserber counter is used by tomoyo_supervisor() to see if
1827 * there is some process monitoring /sys/kernel/security/tomoyo/query.
1829 else if (type == TOMOYO_QUERY)
1830 atomic_inc(&tomoyo_query_observers);
1835 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
1837 * @file: Pointer to "struct file".
1838 * @wait: Pointer to "poll_table".
1840 * Waits for read readiness.
1841 * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd .
1843 int tomoyo_poll_control(struct file *file, poll_table *wait)
1845 struct tomoyo_io_buffer *head = file->private_data;
1848 return head->poll(file, wait);
1852 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
1854 * @file: Pointer to "struct file".
1855 * @buffer: Poiner to buffer to write to.
1856 * @buffer_len: Size of @buffer.
1858 * Returns bytes read on success, negative value otherwise.
1860 * Caller holds tomoyo_read_lock().
1862 int tomoyo_read_control(struct file *file, char __user *buffer,
1863 const int buffer_len)
1866 struct tomoyo_io_buffer *head = file->private_data;
1871 if (mutex_lock_interruptible(&head->io_sem))
1873 /* Call the policy handler. */
1874 len = head->read(head);
1877 /* Write to buffer. */
1878 len = head->read_avail;
1879 if (len > buffer_len)
1883 /* head->read_buf changes by some functions. */
1884 cp = head->read_buf;
1885 if (copy_to_user(buffer, cp, len)) {
1889 head->read_avail -= len;
1890 memmove(cp, cp + len, head->read_avail);
1892 mutex_unlock(&head->io_sem);
1897 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
1899 * @file: Pointer to "struct file".
1900 * @buffer: Pointer to buffer to read from.
1901 * @buffer_len: Size of @buffer.
1903 * Returns @buffer_len on success, negative value otherwise.
1905 * Caller holds tomoyo_read_lock().
1907 int tomoyo_write_control(struct file *file, const char __user *buffer,
1908 const int buffer_len)
1910 struct tomoyo_io_buffer *head = file->private_data;
1911 int error = buffer_len;
1912 int avail_len = buffer_len;
1913 char *cp0 = head->write_buf;
1917 if (!access_ok(VERIFY_READ, buffer, buffer_len))
1919 /* Don't allow updating policies by non manager programs. */
1920 if (head->write != tomoyo_write_pid &&
1921 head->write != tomoyo_write_domain_policy &&
1922 !tomoyo_is_policy_manager())
1924 if (mutex_lock_interruptible(&head->io_sem))
1926 /* Read a line and dispatch it to the policy handler. */
1927 while (avail_len > 0) {
1929 if (head->write_avail >= head->writebuf_size - 1) {
1932 } else if (get_user(c, buffer)) {
1938 cp0[head->write_avail++] = c;
1941 cp0[head->write_avail - 1] = '\0';
1942 head->write_avail = 0;
1943 tomoyo_normalize_line(cp0);
1946 mutex_unlock(&head->io_sem);
1951 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
1953 * @file: Pointer to "struct file".
1955 * Releases memory and returns 0.
1957 * Caller looses tomoyo_read_lock().
1959 int tomoyo_close_control(struct file *file)
1961 struct tomoyo_io_buffer *head = file->private_data;
1962 const bool is_write = !!head->write_buf;
1965 * If the file is /sys/kernel/security/tomoyo/query , decrement the
1968 if (head->type == TOMOYO_QUERY)
1969 atomic_dec(&tomoyo_query_observers);
1971 tomoyo_read_unlock(head->reader_idx);
1972 /* Release memory used for policy I/O. */
1973 kfree(head->read_buf);
1974 head->read_buf = NULL;
1975 kfree(head->write_buf);
1976 head->write_buf = NULL;
1979 file->private_data = NULL;
1986 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
1988 void tomoyo_check_profile(void)
1990 struct tomoyo_domain_info *domain;
1991 const int idx = tomoyo_read_lock();
1992 tomoyo_policy_loaded = true;
1993 /* Check all profiles currently assigned to domains are defined. */
1994 list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) {
1995 const u8 profile = domain->profile;
1996 if (tomoyo_profile_ptr[profile])
1998 panic("Profile %u (used by '%s') not defined.\n",
1999 profile, domain->domainname->name);
2001 tomoyo_read_unlock(idx);
2002 if (tomoyo_profile_version != 20090903)
2003 panic("Profile version %u is not supported.\n",
2004 tomoyo_profile_version);
2005 printk(KERN_INFO "TOMOYO: 2.3.0-pre 2010/06/03\n");
2006 printk(KERN_INFO "Mandatory Access Control activated.\n");