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TOMOYO: Use callback for updating entries.
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / security / tomoyo / common.c
blob6556e5d27d7412a4aff6b0ddbe2be12c22f80118
1 /*
2 * security/tomoyo/common.c
3 *
4 * Common functions for TOMOYO.
5 *
6 * Copyright (C) 2005-2010 NTT DATA CORPORATION
7 */
8
9 #include <linux/uaccess.h>
10 #include <linux/slab.h>
11 #include <linux/security.h>
12 #include "common.h"
13
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
22 };
23
24 /* Profile version. Currently only 20090903 is defined. */
25 static unsigned int tomoyo_profile_version;
26
27 /* Profile table. Memory is allocated as needed. */
28 static struct tomoyo_profile *tomoyo_profile_ptr[TOMOYO_MAX_PROFILES];
29
30 /* String table for functionality that takes 4 modes. */
31 static const char *tomoyo_mode_4[4] = {
32 "disabled", "learning", "permissive", "enforcing"
33 };
34
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",
62 };
63
64 /* Permit policy management by non-root user? */
65 static bool tomoyo_manage_by_non_root;
66
67 /* Utility functions. */
68
69 /**
70 * tomoyo_yesno - Return "yes" or "no".
71 *
72 * @value: Bool value.
73 */
74 static const char *tomoyo_yesno(const unsigned int value)
75 {
76 return value ? "yes" : "no";
77 }
78
79 /**
80 * tomoyo_print_name_union - Print a tomoyo_name_union.
81 *
82 * @head: Pointer to "struct tomoyo_io_buffer".
83 * @ptr: Pointer to "struct tomoyo_name_union".
84 *
85 * Returns true on success, false otherwise.
86 */
87 static bool tomoyo_print_name_union(struct tomoyo_io_buffer *head,
88 const struct tomoyo_name_union *ptr)
89 {
90 int pos = head->read_avail;
91 if (pos && head->read_buf[pos - 1] == ' ')
92 head->read_avail--;
93 if (ptr->is_group)
94 return tomoyo_io_printf(head, " @%s",
95 ptr->group->group_name->name);
96 return tomoyo_io_printf(head, " %s", ptr->filename->name);
97 }
98
99 /**
100 * tomoyo_print_number_union - Print a tomoyo_number_union.
101 *
102 * @head: Pointer to "struct tomoyo_io_buffer".
103 * @ptr: Pointer to "struct tomoyo_number_union".
104 *
105 * Returns true on success, false otherwise.
106 */
107 bool tomoyo_print_number_union(struct tomoyo_io_buffer *head,
108 const struct tomoyo_number_union *ptr)
109 {
110 unsigned long min;
111 unsigned long max;
112 u8 min_type;
113 u8 max_type;
114 if (!tomoyo_io_printf(head, " "))
115 return false;
116 if (ptr->is_group)
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];
123 switch (min_type) {
124 case TOMOYO_VALUE_TYPE_HEXADECIMAL:
125 if (!tomoyo_io_printf(head, "0x%lX", min))
126 return false;
127 break;
128 case TOMOYO_VALUE_TYPE_OCTAL:
129 if (!tomoyo_io_printf(head, "0%lo", min))
130 return false;
131 break;
132 default:
133 if (!tomoyo_io_printf(head, "%lu", min))
134 return false;
135 break;
136 }
137 if (min == max && min_type == max_type)
138 return true;
139 switch (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);
144 default:
145 return tomoyo_io_printf(head, "-%lu", max);
146 }
147 }
148
149 /**
150 * tomoyo_io_printf - Transactional printf() to "struct tomoyo_io_buffer" structure.
151 *
152 * @head: Pointer to "struct tomoyo_io_buffer".
153 * @fmt: The printf()'s format string, followed by parameters.
154 *
155 * Returns true if output was written, false otherwise.
156 *
157 * The snprintf() will truncate, but tomoyo_io_printf() won't.
158 */
159 bool tomoyo_io_printf(struct tomoyo_io_buffer *head, const char *fmt, ...)
160 {
161 va_list args;
162 int len;
163 int pos = head->read_avail;
164 int size = head->readbuf_size - pos;
165
166 if (size <= 0)
167 return false;
168 va_start(args, fmt);
169 len = vsnprintf(head->read_buf + pos, size, fmt, args);
170 va_end(args);
171 if (pos + len >= head->readbuf_size)
172 return false;
173 head->read_avail += len;
174 return true;
175 }
176
177 /**
178 * tomoyo_find_or_assign_new_profile - Create a new profile.
179 *
180 * @profile: Profile number to create.
181 *
182 * Returns pointer to "struct tomoyo_profile" on success, NULL otherwise.
183 */
184 static struct tomoyo_profile *tomoyo_find_or_assign_new_profile
185 (const unsigned int profile)
186 {
187 struct tomoyo_profile *ptr;
188 struct tomoyo_profile *entry;
189 if (profile >= TOMOYO_MAX_PROFILES)
190 return NULL;
191 ptr = tomoyo_profile_ptr[profile];
192 if (ptr)
193 return ptr;
194 entry = kzalloc(sizeof(*entry), GFP_NOFS);
195 if (mutex_lock_interruptible(&tomoyo_policy_lock))
196 goto out;
197 ptr = tomoyo_profile_ptr[profile];
198 if (!ptr && tomoyo_memory_ok(entry)) {
199 ptr = 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;
208 entry = NULL;
209 }
210 mutex_unlock(&tomoyo_policy_lock);
211 out:
212 kfree(entry);
213 return ptr;
214 }
215
216 /**
217 * tomoyo_profile - Find a profile.
218 *
219 * @profile: Profile number to find.
220 *
221 * Returns pointer to "struct tomoyo_profile".
222 */
223 struct tomoyo_profile *tomoyo_profile(const u8 profile)
224 {
225 struct tomoyo_profile *ptr = tomoyo_profile_ptr[profile];
226 if (!tomoyo_policy_loaded)
227 return &tomoyo_default_profile;
228 BUG_ON(!ptr);
229 return ptr;
230 }
231
232 /**
233 * tomoyo_write_profile - Write profile table.
234 *
235 * @head: Pointer to "struct tomoyo_io_buffer".
236 *
237 * Returns 0 on success, negative value otherwise.
238 */
239 static int tomoyo_write_profile(struct tomoyo_io_buffer *head)
240 {
241 char *data = head->write_buf;
242 unsigned int i;
243 int value;
244 int mode;
245 u8 config;
246 bool use_default = false;
247 char *cp;
248 struct tomoyo_profile *profile;
249 if (sscanf(data, "PROFILE_VERSION=%u", &tomoyo_profile_version) == 1)
250 return 0;
251 i = simple_strtoul(data, &cp, 10);
252 if (data == cp) {
253 profile = &tomoyo_default_profile;
254 } else {
255 if (*cp != '-')
256 return -EINVAL;
257 data = cp + 1;
258 profile = tomoyo_find_or_assign_new_profile(i);
259 if (!profile)
260 return -EINVAL;
261 }
262 cp = strchr(data, '=');
263 if (!cp)
264 return -EINVAL;
265 *cp++ = '\0';
266 if (profile != &tomoyo_default_profile)
267 use_default = strstr(cp, "use_default") != NULL;
268 if (strstr(cp, "verbose=yes"))
269 value = 1;
270 else if (strstr(cp, "verbose=no"))
271 value = 0;
272 else
273 value = -1;
274 if (!strcmp(data, "PREFERENCE::enforcing")) {
275 if (use_default) {
276 profile->enforcing = &tomoyo_default_profile.preference;
277 return 0;
278 }
279 profile->enforcing = &profile->preference;
280 if (value >= 0)
281 profile->preference.enforcing_verbose = value;
282 return 0;
283 }
284 if (!strcmp(data, "PREFERENCE::permissive")) {
285 if (use_default) {
286 profile->permissive = &tomoyo_default_profile.preference;
287 return 0;
288 }
289 profile->permissive = &profile->preference;
290 if (value >= 0)
291 profile->preference.permissive_verbose = value;
292 return 0;
293 }
294 if (!strcmp(data, "PREFERENCE::learning")) {
295 char *cp2;
296 if (use_default) {
297 profile->learning = &tomoyo_default_profile.preference;
298 return 0;
299 }
300 profile->learning = &profile->preference;
301 if (value >= 0)
302 profile->preference.learning_verbose = value;
303 cp2 = strstr(cp, "max_entry=");
304 if (cp2)
305 sscanf(cp2 + 10, "%u",
306 &profile->preference.learning_max_entry);
307 return 0;
308 }
309 if (profile == &tomoyo_default_profile)
310 return -EINVAL;
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);
315 return 0;
316 }
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::")) {
321 config = 0;
322 for (i = 0; i < TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX; i++) {
323 if (strcmp(data, tomoyo_mac_keywords[i]))
324 continue;
325 config = profile->config[i];
326 break;
327 }
328 if (i == TOMOYO_MAX_MAC_INDEX + TOMOYO_MAX_MAC_CATEGORY_INDEX)
329 return -EINVAL;
330 } else {
331 return -EINVAL;
332 }
333 if (use_default) {
334 config = TOMOYO_CONFIG_USE_DEFAULT;
335 } else {
336 for (mode = 3; mode >= 0; mode--)
337 if (strstr(cp, tomoyo_mode_4[mode]))
338 /*
339 * Update lower 3 bits in order to distinguish
340 * 'config' from 'TOMOYO_CONFIG_USE_DEAFULT'.
341 */
342 config = (config & ~7) | mode;
343 }
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;
348 return 0;
349 }
350
351 /**
352 * tomoyo_read_profile - Read profile table.
353 *
354 * @head: Pointer to "struct tomoyo_io_buffer".
355 *
356 * Returns 0.
357 */
358 static int tomoyo_read_profile(struct tomoyo_io_buffer *head)
359 {
360 int index;
361 if (head->read_eof)
362 return 0;
363 if (head->read_bit)
364 goto body;
365 tomoyo_io_printf(head, "PROFILE_VERSION=%s\n", "20090903");
366 tomoyo_io_printf(head, "PREFERENCE::learning={ verbose=%s "
367 "max_entry=%u }\n",
368 tomoyo_yesno(tomoyo_default_profile.preference.
369 learning_verbose),
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.
376 enforcing_verbose));
377 head->read_bit = 1;
378 body:
379 for (index = head->read_step; index < TOMOYO_MAX_PROFILES; index++) {
380 bool done;
381 u8 config;
382 int i;
383 int pos;
384 const struct tomoyo_profile *profile
385 = tomoyo_profile_ptr[index];
386 const struct tomoyo_path_info *comment;
387 head->read_step = index;
388 if (!profile)
389 continue;
390 pos = head->read_avail;
391 comment = profile->comment;
392 done = tomoyo_io_printf(head, "%u-COMMENT=%s\n", index,
393 comment ? comment->name : "");
394 if (!done)
395 goto out;
396 config = profile->default_config;
397 if (!tomoyo_io_printf(head, "%u-CONFIG={ mode=%s }\n", index,
398 tomoyo_mode_4[config & 3]))
399 goto out;
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)
404 continue;
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]))
409 goto out;
410 }
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.
415 learning_verbose),
416 profile->preference.learning_max_entry))
417 goto out;
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)))
423 goto out;
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.
428 enforcing_verbose)))
429 goto out;
430 continue;
431 out:
432 head->read_avail = pos;
433 break;
434 }
435 if (index == TOMOYO_MAX_PROFILES)
436 head->read_eof = true;
437 return 0;
438 }
439
440 /*
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.
444 *
445 * An entry is added by
446 *
447 * # echo '<kernel> /sbin/mingetty /bin/login /bin/bash' > \
448 * /sys/kernel/security/tomoyo/manager
449 * (if you want to specify by a domainname)
450 *
451 * or
452 *
453 * # echo '/usr/sbin/tomoyo-editpolicy' > /sys/kernel/security/tomoyo/manager
454 * (if you want to specify by a program's location)
455 *
456 * and is deleted by
457 *
458 * # echo 'delete <kernel> /sbin/mingetty /bin/login /bin/bash' > \
459 * /sys/kernel/security/tomoyo/manager
460 *
461 * or
462 *
463 * # echo 'delete /usr/sbin/tomoyo-editpolicy' > \
464 * /sys/kernel/security/tomoyo/manager
465 *
466 * and all entries are retrieved by
467 *
468 * # cat /sys/kernel/security/tomoyo/manager
469 */
470 LIST_HEAD(tomoyo_policy_manager_list);
471
472 /**
473 * tomoyo_update_manager_entry - Add a manager entry.
474 *
475 * @manager: The path to manager or the domainnamme.
476 * @is_delete: True if it is a delete request.
477 *
478 * Returns 0 on success, negative value otherwise.
479 *
480 * Caller holds tomoyo_read_lock().
481 */
482 static int tomoyo_update_manager_entry(const char *manager,
483 const bool is_delete)
484 {
485 struct tomoyo_policy_manager_entry *ptr;
486 struct tomoyo_policy_manager_entry e = { };
487 int error = is_delete ? -ENOENT : -ENOMEM;
488
489 if (tomoyo_is_domain_def(manager)) {
490 if (!tomoyo_is_correct_domain(manager))
491 return -EINVAL;
492 e.is_domain = true;
493 } else {
494 if (!tomoyo_is_correct_path(manager))
495 return -EINVAL;
496 }
497 e.manager = tomoyo_get_name(manager);
498 if (!e.manager)
499 return -ENOMEM;
500 if (mutex_lock_interruptible(&tomoyo_policy_lock))
501 goto out;
502 list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) {
503 if (ptr->manager != e.manager)
504 continue;
505 ptr->is_deleted = is_delete;
506 error = 0;
507 break;
508 }
509 if (!is_delete && error) {
510 struct tomoyo_policy_manager_entry *entry =
511 tomoyo_commit_ok(&e, sizeof(e));
512 if (entry) {
513 list_add_tail_rcu(&entry->list,
514 &tomoyo_policy_manager_list);
515 error = 0;
516 }
517 }
518 mutex_unlock(&tomoyo_policy_lock);
519 out:
520 tomoyo_put_name(e.manager);
521 return error;
522 }
523
524 /**
525 * tomoyo_write_manager_policy - Write manager policy.
526 *
527 * @head: Pointer to "struct tomoyo_io_buffer".
528 *
529 * Returns 0 on success, negative value otherwise.
530 *
531 * Caller holds tomoyo_read_lock().
532 */
533 static int tomoyo_write_manager_policy(struct tomoyo_io_buffer *head)
534 {
535 char *data = head->write_buf;
536 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
537
538 if (!strcmp(data, "manage_by_non_root")) {
539 tomoyo_manage_by_non_root = !is_delete;
540 return 0;
541 }
542 return tomoyo_update_manager_entry(data, is_delete);
543 }
544
545 /**
546 * tomoyo_read_manager_policy - Read manager policy.
547 *
548 * @head: Pointer to "struct tomoyo_io_buffer".
549 *
550 * Returns 0.
551 *
552 * Caller holds tomoyo_read_lock().
553 */
554 static int tomoyo_read_manager_policy(struct tomoyo_io_buffer *head)
555 {
556 struct list_head *pos;
557 bool done = true;
558
559 if (head->read_eof)
560 return 0;
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,
565 list);
566 if (ptr->is_deleted)
567 continue;
568 done = tomoyo_io_printf(head, "%s\n", ptr->manager->name);
569 if (!done)
570 break;
571 }
572 head->read_eof = done;
573 return 0;
574 }
575
576 /**
577 * tomoyo_is_policy_manager - Check whether the current process is a policy manager.
578 *
579 * Returns true if the current process is permitted to modify policy
580 * via /sys/kernel/security/tomoyo/ interface.
581 *
582 * Caller holds tomoyo_read_lock().
583 */
584 static bool tomoyo_is_policy_manager(void)
585 {
586 struct tomoyo_policy_manager_entry *ptr;
587 const char *exe;
588 const struct task_struct *task = current;
589 const struct tomoyo_path_info *domainname = tomoyo_domain()->domainname;
590 bool found = false;
591
592 if (!tomoyo_policy_loaded)
593 return true;
594 if (!tomoyo_manage_by_non_root && (task->cred->uid || task->cred->euid))
595 return false;
596 list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) {
597 if (!ptr->is_deleted && ptr->is_domain
598 && !tomoyo_pathcmp(domainname, ptr->manager)) {
599 found = true;
600 break;
601 }
602 }
603 if (found)
604 return true;
605 exe = tomoyo_get_exe();
606 if (!exe)
607 return false;
608 list_for_each_entry_rcu(ptr, &tomoyo_policy_manager_list, list) {
609 if (!ptr->is_deleted && !ptr->is_domain
610 && !strcmp(exe, ptr->manager->name)) {
611 found = true;
612 break;
613 }
614 }
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);
621 last_pid = pid;
622 }
623 }
624 kfree(exe);
625 return found;
626 }
627
628 /**
629 * tomoyo_is_select_one - Parse select command.
630 *
631 * @head: Pointer to "struct tomoyo_io_buffer".
632 * @data: String to parse.
633 *
634 * Returns true on success, false otherwise.
635 *
636 * Caller holds tomoyo_read_lock().
637 */
638 static bool tomoyo_is_select_one(struct tomoyo_io_buffer *head,
639 const char *data)
640 {
641 unsigned int pid;
642 struct tomoyo_domain_info *domain = NULL;
643 bool global_pid = false;
644
645 if (sscanf(data, "pid=%u", &pid) == 1 ||
646 (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
647 struct task_struct *p;
648 rcu_read_lock();
649 read_lock(&tasklist_lock);
650 if (global_pid)
651 p = find_task_by_pid_ns(pid, &init_pid_ns);
652 else
653 p = find_task_by_vpid(pid);
654 if (p)
655 domain = tomoyo_real_domain(p);
656 read_unlock(&tasklist_lock);
657 rcu_read_unlock();
658 } else if (!strncmp(data, "domain=", 7)) {
659 if (tomoyo_is_domain_def(data + 7))
660 domain = tomoyo_find_domain(data + 7);
661 } else
662 return false;
663 head->write_var1 = domain;
664 /* Accessing read_buf is safe because head->io_sem is held. */
665 if (!head->read_buf)
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;
671 if (domain) {
672 struct tomoyo_domain_info *d;
673 head->read_var1 = NULL;
674 list_for_each_entry_rcu(d, &tomoyo_domain_list, list) {
675 if (d == domain)
676 break;
677 head->read_var1 = &d->list;
678 }
679 head->read_var2 = NULL;
680 head->read_bit = 0;
681 head->read_step = 0;
682 if (domain->is_deleted)
683 tomoyo_io_printf(head, "# This is a deleted domain.\n");
684 }
685 return true;
686 }
687
688 /**
689 * tomoyo_delete_domain - Delete a domain.
690 *
691 * @domainname: The name of domain.
692 *
693 * Returns 0.
694 *
695 * Caller holds tomoyo_read_lock().
696 */
697 static int tomoyo_delete_domain(char *domainname)
698 {
699 struct tomoyo_domain_info *domain;
700 struct tomoyo_path_info name;
701
702 name.name = domainname;
703 tomoyo_fill_path_info(&name);
704 if (mutex_lock_interruptible(&tomoyo_policy_lock))
705 return 0;
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)
710 continue;
711 if (domain->is_deleted ||
712 tomoyo_pathcmp(domain->domainname, &name))
713 continue;
714 domain->is_deleted = true;
715 break;
716 }
717 mutex_unlock(&tomoyo_policy_lock);
718 return 0;
719 }
720
721 /**
722 * tomoyo_write_domain_policy2 - Write domain policy.
723 *
724 * @head: Pointer to "struct tomoyo_io_buffer".
725 *
726 * Returns 0 on success, negative value otherwise.
727 *
728 * Caller holds tomoyo_read_lock().
729 */
730 static int tomoyo_write_domain_policy2(char *data,
731 struct tomoyo_domain_info *domain,
732 const bool is_delete)
733 {
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);
737 }
738
739 /**
740 * tomoyo_write_domain_policy - Write domain policy.
741 *
742 * @head: Pointer to "struct tomoyo_io_buffer".
743 *
744 * Returns 0 on success, negative value otherwise.
745 *
746 * Caller holds tomoyo_read_lock().
747 */
748 static int tomoyo_write_domain_policy(struct tomoyo_io_buffer *head)
749 {
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;
755
756 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE))
757 is_delete = true;
758 else if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_SELECT))
759 is_select = true;
760 if (is_select && tomoyo_is_select_one(head, data))
761 return 0;
762 /* Don't allow updating policies by non manager programs. */
763 if (!tomoyo_is_policy_manager())
764 return -EPERM;
765 if (tomoyo_is_domain_def(data)) {
766 domain = NULL;
767 if (is_delete)
768 tomoyo_delete_domain(data);
769 else if (is_select)
770 domain = tomoyo_find_domain(data);
771 else
772 domain = tomoyo_find_or_assign_new_domain(data, 0);
773 head->write_var1 = domain;
774 return 0;
775 }
776 if (!domain)
777 return -EINVAL;
778
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;
783 return 0;
784 }
785 if (!strcmp(data, TOMOYO_KEYWORD_IGNORE_GLOBAL_ALLOW_READ)) {
786 domain->ignore_global_allow_read = !is_delete;
787 return 0;
788 }
789 if (!strcmp(data, TOMOYO_KEYWORD_QUOTA_EXCEEDED)) {
790 domain->quota_warned = !is_delete;
791 return 0;
792 }
793 if (!strcmp(data, TOMOYO_KEYWORD_TRANSITION_FAILED)) {
794 domain->transition_failed = !is_delete;
795 return 0;
796 }
797 return tomoyo_write_domain_policy2(data, domain, is_delete);
798 }
799
800 /**
801 * tomoyo_print_path_acl - Print a single path ACL entry.
802 *
803 * @head: Pointer to "struct tomoyo_io_buffer".
804 * @ptr: Pointer to "struct tomoyo_path_acl".
805 *
806 * Returns true on success, false otherwise.
807 */
808 static bool tomoyo_print_path_acl(struct tomoyo_io_buffer *head,
809 struct tomoyo_path_acl *ptr)
810 {
811 int pos;
812 u8 bit;
813 const u16 perm = ptr->perm;
814
815 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_OPERATION; bit++) {
816 if (!(perm & (1 << bit)))
817 continue;
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)))
821 continue;
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"))
827 goto out;
828 }
829 head->read_bit = 0;
830 return true;
831 out:
832 head->read_bit = bit;
833 head->read_avail = pos;
834 return false;
835 }
836
837 /**
838 * tomoyo_print_path2_acl - Print a double path ACL entry.
839 *
840 * @head: Pointer to "struct tomoyo_io_buffer".
841 * @ptr: Pointer to "struct tomoyo_path2_acl".
842 *
843 * Returns true on success, false otherwise.
844 */
845 static bool tomoyo_print_path2_acl(struct tomoyo_io_buffer *head,
846 struct tomoyo_path2_acl *ptr)
847 {
848 int pos;
849 const u8 perm = ptr->perm;
850 u8 bit;
851
852 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH2_OPERATION; bit++) {
853 if (!(perm & (1 << bit)))
854 continue;
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"))
861 goto out;
862 }
863 head->read_bit = 0;
864 return true;
865 out:
866 head->read_bit = bit;
867 head->read_avail = pos;
868 return false;
869 }
870
871 /**
872 * tomoyo_print_path_number_acl - Print a path_number ACL entry.
873 *
874 * @head: Pointer to "struct tomoyo_io_buffer".
875 * @ptr: Pointer to "struct tomoyo_path_number_acl".
876 *
877 * Returns true on success, false otherwise.
878 */
879 static bool tomoyo_print_path_number_acl(struct tomoyo_io_buffer *head,
880 struct tomoyo_path_number_acl *ptr)
881 {
882 int pos;
883 u8 bit;
884 const u8 perm = ptr->perm;
885 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER_OPERATION;
886 bit++) {
887 if (!(perm & (1 << bit)))
888 continue;
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"))
895 goto out;
896 }
897 head->read_bit = 0;
898 return true;
899 out:
900 head->read_bit = bit;
901 head->read_avail = pos;
902 return false;
903 }
904
905 /**
906 * tomoyo_print_path_number3_acl - Print a path_number3 ACL entry.
907 *
908 * @head: Pointer to "struct tomoyo_io_buffer".
909 * @ptr: Pointer to "struct tomoyo_path_number3_acl".
910 *
911 * Returns true on success, false otherwise.
912 */
913 static bool tomoyo_print_path_number3_acl(struct tomoyo_io_buffer *head,
914 struct tomoyo_path_number3_acl *ptr)
915 {
916 int pos;
917 u8 bit;
918 const u16 perm = ptr->perm;
919 for (bit = head->read_bit; bit < TOMOYO_MAX_PATH_NUMBER3_OPERATION;
920 bit++) {
921 if (!(perm & (1 << bit)))
922 continue;
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"))
931 goto out;
932 }
933 head->read_bit = 0;
934 return true;
935 out:
936 head->read_bit = bit;
937 head->read_avail = pos;
938 return false;
939 }
940
941 /**
942 * tomoyo_print_mount_acl - Print a mount ACL entry.
943 *
944 * @head: Pointer to "struct tomoyo_io_buffer".
945 * @ptr: Pointer to "struct tomoyo_mount_acl".
946 *
947 * Returns true on success, false otherwise.
948 */
949 static bool tomoyo_print_mount_acl(struct tomoyo_io_buffer *head,
950 struct tomoyo_mount_acl *ptr)
951 {
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;
960 return false;
961 }
962 return true;
963 }
964
965 /**
966 * tomoyo_print_entry - Print an ACL entry.
967 *
968 * @head: Pointer to "struct tomoyo_io_buffer".
969 * @ptr: Pointer to an ACL entry.
970 *
971 * Returns true on success, false otherwise.
972 */
973 static bool tomoyo_print_entry(struct tomoyo_io_buffer *head,
974 struct tomoyo_acl_info *ptr)
975 {
976 const u8 acl_type = ptr->type;
977
978 if (ptr->is_deleted)
979 return true;
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);
984 }
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);
989 }
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,
993 head);
994 return tomoyo_print_path_number_acl(head, acl);
995 }
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,
999 head);
1000 return tomoyo_print_path_number3_acl(head, acl);
1001 }
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);
1006 }
1007 BUG(); /* This must not happen. */
1008 return false;
1009 }
1010
1011 /**
1012 * tomoyo_read_domain_policy - Read domain policy.
1013 *
1014 * @head: Pointer to "struct tomoyo_io_buffer".
1015 *
1016 * Returns 0.
1017 *
1018 * Caller holds tomoyo_read_lock().
1019 */
1020 static int tomoyo_read_domain_policy(struct tomoyo_io_buffer *head)
1021 {
1022 struct list_head *dpos;
1023 struct list_head *apos;
1024 bool done = true;
1025
1026 if (head->read_eof)
1027 return 0;
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)
1037 goto acl_loop;
1038 if (domain->is_deleted && !head->read_single_domain)
1039 continue;
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
1049 "%u\n%s%s%s\n",
1050 domain->domainname->name,
1051 domain->profile, quota_exceeded,
1052 transition_failed,
1053 ignore_global_allow_read);
1054 if (!done)
1055 break;
1056 head->read_step = 2;
1057 acl_loop:
1058 if (head->read_step == 3)
1059 goto tail_mark;
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,
1065 list);
1066 done = tomoyo_print_entry(head, ptr);
1067 if (!done)
1068 break;
1069 }
1070 if (!done)
1071 break;
1072 head->read_step = 3;
1073 tail_mark:
1074 done = tomoyo_io_printf(head, "\n");
1075 if (!done)
1076 break;
1077 head->read_step = 1;
1078 if (head->read_single_domain)
1079 break;
1080 }
1081 head->read_eof = done;
1082 return 0;
1083 }
1084
1085 /**
1086 * tomoyo_write_domain_profile - Assign profile for specified domain.
1087 *
1088 * @head: Pointer to "struct tomoyo_io_buffer".
1089 *
1090 * Returns 0 on success, -EINVAL otherwise.
1091 *
1092 * This is equivalent to doing
1093 *
1094 * ( echo "select " $domainname; echo "use_profile " $profile ) |
1095 * /usr/sbin/tomoyo-loadpolicy -d
1096 *
1097 * Caller holds tomoyo_read_lock().
1098 */
1099 static int tomoyo_write_domain_profile(struct tomoyo_io_buffer *head)
1100 {
1101 char *data = head->write_buf;
1102 char *cp = strchr(data, ' ');
1103 struct tomoyo_domain_info *domain;
1104 unsigned long profile;
1105
1106 if (!cp)
1107 return -EINVAL;
1108 *cp = '\0';
1109 domain = tomoyo_find_domain(cp + 1);
1110 if (strict_strtoul(data, 10, &profile))
1111 return -EINVAL;
1112 if (domain && profile < TOMOYO_MAX_PROFILES
1113 && (tomoyo_profile_ptr[profile] || !tomoyo_policy_loaded))
1114 domain->profile = (u8) profile;
1115 return 0;
1116 }
1117
1118 /**
1119 * tomoyo_read_domain_profile - Read only domainname and profile.
1120 *
1121 * @head: Pointer to "struct tomoyo_io_buffer".
1122 *
1123 * Returns list of profile number and domainname pairs.
1124 *
1125 * This is equivalent to doing
1126 *
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 = ""; } } ; '
1131 *
1132 * Caller holds tomoyo_read_lock().
1133 */
1134 static int tomoyo_read_domain_profile(struct tomoyo_io_buffer *head)
1135 {
1136 struct list_head *pos;
1137 bool done = true;
1138
1139 if (head->read_eof)
1140 return 0;
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)
1145 continue;
1146 done = tomoyo_io_printf(head, "%u %s\n", domain->profile,
1147 domain->domainname->name);
1148 if (!done)
1149 break;
1150 }
1151 head->read_eof = done;
1152 return 0;
1153 }
1154
1155 /**
1156 * tomoyo_write_pid: Specify PID to obtain domainname.
1157 *
1158 * @head: Pointer to "struct tomoyo_io_buffer".
1159 *
1160 * Returns 0.
1161 */
1162 static int tomoyo_write_pid(struct tomoyo_io_buffer *head)
1163 {
1164 unsigned long pid;
1165 /* No error check. */
1166 strict_strtoul(head->write_buf, 10, &pid);
1167 head->read_step = (int) pid;
1168 head->read_eof = false;
1169 return 0;
1170 }
1171
1172 /**
1173 * tomoyo_read_pid - Get domainname of the specified PID.
1174 *
1175 * @head: Pointer to "struct tomoyo_io_buffer".
1176 *
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.
1181 */
1182 static int tomoyo_read_pid(struct tomoyo_io_buffer *head)
1183 {
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;
1188 rcu_read_lock();
1189 read_lock(&tasklist_lock);
1190 p = find_task_by_vpid(pid);
1191 if (p)
1192 domain = tomoyo_real_domain(p);
1193 read_unlock(&tasklist_lock);
1194 rcu_read_unlock();
1195 if (domain)
1196 tomoyo_io_printf(head, "%d %u %s", pid, domain->profile,
1197 domain->domainname->name);
1198 head->read_eof = true;
1199 }
1200 return 0;
1201 }
1202
1203 /**
1204 * tomoyo_write_exception_policy - Write exception policy.
1205 *
1206 * @head: Pointer to "struct tomoyo_io_buffer".
1207 *
1208 * Returns 0 on success, negative value otherwise.
1209 *
1210 * Caller holds tomoyo_read_lock().
1211 */
1212 static int tomoyo_write_exception_policy(struct tomoyo_io_buffer *head)
1213 {
1214 char *data = head->write_buf;
1215 bool is_delete = tomoyo_str_starts(&data, TOMOYO_KEYWORD_DELETE);
1216
1217 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_KEEP_DOMAIN))
1218 return tomoyo_write_domain_keeper_policy(data, false,
1219 is_delete);
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,
1224 is_delete);
1225 if (tomoyo_str_starts(&data, TOMOYO_KEYWORD_NO_INITIALIZE_DOMAIN))
1226 return tomoyo_write_domain_initializer_policy(data, true,
1227 is_delete);
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);
1242 return -EINVAL;
1243 }
1244
1245 /**
1246 * tomoyo_read_exception_policy - Read exception policy.
1247 *
1248 * @head: Pointer to "struct tomoyo_io_buffer".
1249 *
1250 * Returns 0 on success, -EINVAL otherwise.
1251 *
1252 * Caller holds tomoyo_read_lock().
1253 */
1254 static int tomoyo_read_exception_policy(struct tomoyo_io_buffer *head)
1255 {
1256 if (!head->read_eof) {
1257 switch (head->read_step) {
1258 case 0:
1259 head->read_var2 = NULL;
1260 head->read_step = 1;
1261 case 1:
1262 if (!tomoyo_read_domain_keeper_policy(head))
1263 break;
1264 head->read_var2 = NULL;
1265 head->read_step = 2;
1266 case 2:
1267 if (!tomoyo_read_globally_readable_policy(head))
1268 break;
1269 head->read_var2 = NULL;
1270 head->read_step = 3;
1271 case 3:
1272 head->read_var2 = NULL;
1273 head->read_step = 4;
1274 case 4:
1275 if (!tomoyo_read_domain_initializer_policy(head))
1276 break;
1277 head->read_var2 = NULL;
1278 head->read_step = 5;
1279 case 5:
1280 if (!tomoyo_read_alias_policy(head))
1281 break;
1282 head->read_var2 = NULL;
1283 head->read_step = 6;
1284 case 6:
1285 if (!tomoyo_read_aggregator_policy(head))
1286 break;
1287 head->read_var2 = NULL;
1288 head->read_step = 7;
1289 case 7:
1290 if (!tomoyo_read_file_pattern(head))
1291 break;
1292 head->read_var2 = NULL;
1293 head->read_step = 8;
1294 case 8:
1295 if (!tomoyo_read_no_rewrite_policy(head))
1296 break;
1297 head->read_var2 = NULL;
1298 head->read_step = 9;
1299 case 9:
1300 if (!tomoyo_read_path_group_policy(head))
1301 break;
1302 head->read_var1 = NULL;
1303 head->read_var2 = NULL;
1304 head->read_step = 10;
1305 case 10:
1306 if (!tomoyo_read_number_group_policy(head))
1307 break;
1308 head->read_var1 = NULL;
1309 head->read_var2 = NULL;
1310 head->read_step = 11;
1311 case 11:
1312 head->read_eof = true;
1313 break;
1314 default:
1315 return -EINVAL;
1316 }
1317 }
1318 return 0;
1319 }
1320
1321 /**
1322 * tomoyo_print_header - Get header line of audit log.
1323 *
1324 * @r: Pointer to "struct tomoyo_request_info".
1325 *
1326 * Returns string representation.
1327 *
1328 * This function uses kmalloc(), so caller must kfree() if this function
1329 * didn't return NULL.
1330 */
1331 static char *tomoyo_print_header(struct tomoyo_request_info *r)
1332 {
1333 static const char *tomoyo_mode_4[4] = {
1334 "disabled", "learning", "permissive", "enforcing"
1335 };
1336 struct timeval tv;
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);
1340 if (!buffer)
1341 return NULL;
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());
1352 return buffer;
1353 }
1354
1355 /**
1356 * tomoyo_init_audit_log - Allocate buffer for audit logs.
1357 *
1358 * @len: Required size.
1359 * @r: Pointer to "struct tomoyo_request_info".
1360 *
1361 * Returns pointer to allocated memory.
1362 *
1363 * The @len is updated to add the header lines' size on success.
1364 *
1365 * This function uses kzalloc(), so caller must kfree() if this function
1366 * didn't return NULL.
1367 */
1368 static char *tomoyo_init_audit_log(int *len, struct tomoyo_request_info *r)
1369 {
1370 char *buf = NULL;
1371 const char *header;
1372 const char *domainname;
1373 if (!r->domain)
1374 r->domain = tomoyo_domain();
1375 domainname = r->domain->domainname->name;
1376 header = tomoyo_print_header(r);
1377 if (!header)
1378 return NULL;
1379 *len += strlen(domainname) + strlen(header) + 10;
1380 buf = kzalloc(*len, GFP_NOFS);
1381 if (buf)
1382 snprintf(buf, (*len) - 1, "%s\n%s\n", header, domainname);
1383 kfree(header);
1384 return buf;
1385 }
1386
1387 /* Wait queue for tomoyo_query_list. */
1388 static DECLARE_WAIT_QUEUE_HEAD(tomoyo_query_wait);
1389
1390 /* Lock for manipulating tomoyo_query_list. */
1391 static DEFINE_SPINLOCK(tomoyo_query_list_lock);
1392
1393 /* Structure for query. */
1394 struct tomoyo_query_entry {
1395 struct list_head list;
1396 char *query;
1397 int query_len;
1398 unsigned int serial;
1399 int timer;
1400 int answer;
1401 };
1402
1403 /* The list for "struct tomoyo_query_entry". */
1404 static LIST_HEAD(tomoyo_query_list);
1405
1406 /*
1407 * Number of "struct file" referring /sys/kernel/security/tomoyo/query
1408 * interface.
1409 */
1410 static atomic_t tomoyo_query_observers = ATOMIC_INIT(0);
1411
1412 /**
1413 * tomoyo_supervisor - Ask for the supervisor's decision.
1414 *
1415 * @r: Pointer to "struct tomoyo_request_info".
1416 * @fmt: The printf()'s format string, followed by parameters.
1417 *
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.
1422 */
1423 int tomoyo_supervisor(struct tomoyo_request_info *r, const char *fmt, ...)
1424 {
1425 va_list args;
1426 int error = -EPERM;
1427 int pos;
1428 int len;
1429 static unsigned int tomoyo_serial;
1430 struct tomoyo_query_entry *tomoyo_query_entry = NULL;
1431 bool quota_exceeded = false;
1432 char *header;
1433 switch (r->mode) {
1434 char *buffer;
1435 case TOMOYO_CONFIG_LEARNING:
1436 if (!tomoyo_domain_quota_is_ok(r))
1437 return 0;
1438 va_start(args, fmt);
1439 len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 4;
1440 va_end(args);
1441 buffer = kmalloc(len, GFP_NOFS);
1442 if (!buffer)
1443 return 0;
1444 va_start(args, fmt);
1445 vsnprintf(buffer, len - 1, fmt, args);
1446 va_end(args);
1447 tomoyo_normalize_line(buffer);
1448 tomoyo_write_domain_policy2(buffer, r->domain, false);
1449 kfree(buffer);
1450 /* fall through */
1451 case TOMOYO_CONFIG_PERMISSIVE:
1452 return 0;
1453 }
1454 if (!r->domain)
1455 r->domain = tomoyo_domain();
1456 if (!atomic_read(&tomoyo_query_observers))
1457 return -EPERM;
1458 va_start(args, fmt);
1459 len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 32;
1460 va_end(args);
1461 header = tomoyo_init_audit_log(&len, r);
1462 if (!header)
1463 goto out;
1464 tomoyo_query_entry = kzalloc(sizeof(*tomoyo_query_entry), GFP_NOFS);
1465 if (!tomoyo_query_entry)
1466 goto out;
1467 tomoyo_query_entry->query = kzalloc(len, GFP_NOFS);
1468 if (!tomoyo_query_entry->query)
1469 goto out;
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;
1476 } else {
1477 tomoyo_query_memory_size += len + sizeof(*tomoyo_query_entry);
1478 tomoyo_query_entry->serial = tomoyo_serial++;
1479 }
1480 spin_unlock(&tomoyo_query_list_lock);
1481 if (quota_exceeded)
1482 goto out;
1483 pos = snprintf(tomoyo_query_entry->query, len - 1, "Q%u-%hu\n%s",
1484 tomoyo_query_entry->serial, r->retry, header);
1485 kfree(header);
1486 header = NULL;
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;
1490 va_end(args);
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)
1502 break;
1503 }
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;
1511 r->retry++;
1512 break;
1513 case 1:
1514 /* Granted by administrator. */
1515 error = 0;
1516 break;
1517 case 0:
1518 /* Timed out. */
1519 break;
1520 default:
1521 /* Rejected by administrator. */
1522 break;
1523 }
1524 out:
1525 if (tomoyo_query_entry)
1526 kfree(tomoyo_query_entry->query);
1527 kfree(tomoyo_query_entry);
1528 kfree(header);
1529 return error;
1530 }
1531
1532 /**
1533 * tomoyo_poll_query - poll() for /sys/kernel/security/tomoyo/query.
1534 *
1535 * @file: Pointer to "struct file".
1536 * @wait: Pointer to "poll_table".
1537 *
1538 * Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise.
1539 *
1540 * Waits for access requests which violated policy in enforcing mode.
1541 */
1542 static int tomoyo_poll_query(struct file *file, poll_table *wait)
1543 {
1544 struct list_head *tmp;
1545 bool found = false;
1546 u8 i;
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,
1552 list);
1553 if (ptr->answer)
1554 continue;
1555 found = true;
1556 break;
1557 }
1558 spin_unlock(&tomoyo_query_list_lock);
1559 if (found)
1560 return POLLIN | POLLRDNORM;
1561 if (i)
1562 break;
1563 poll_wait(file, &tomoyo_query_wait, wait);
1564 }
1565 return 0;
1566 }
1567
1568 /**
1569 * tomoyo_read_query - Read access requests which violated policy in enforcing mode.
1570 *
1571 * @head: Pointer to "struct tomoyo_io_buffer".
1572 *
1573 * Returns 0.
1574 */
1575 static int tomoyo_read_query(struct tomoyo_io_buffer *head)
1576 {
1577 struct list_head *tmp;
1578 int pos = 0;
1579 int len = 0;
1580 char *buf;
1581 if (head->read_avail)
1582 return 0;
1583 if (head->read_buf) {
1584 kfree(head->read_buf);
1585 head->read_buf = NULL;
1586 head->readbuf_size = 0;
1587 }
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);
1592 if (ptr->answer)
1593 continue;
1594 if (pos++ != head->read_step)
1595 continue;
1596 len = ptr->query_len;
1597 break;
1598 }
1599 spin_unlock(&tomoyo_query_list_lock);
1600 if (!len) {
1601 head->read_step = 0;
1602 return 0;
1603 }
1604 buf = kzalloc(len, GFP_NOFS);
1605 if (!buf)
1606 return 0;
1607 pos = 0;
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);
1612 if (ptr->answer)
1613 continue;
1614 if (pos++ != head->read_step)
1615 continue;
1616 /*
1617 * Some query can be skipped because tomoyo_query_list
1618 * can change, but I don't care.
1619 */
1620 if (len == ptr->query_len)
1621 memmove(buf, ptr->query, len);
1622 break;
1623 }
1624 spin_unlock(&tomoyo_query_list_lock);
1625 if (buf[0]) {
1626 head->read_avail = len;
1627 head->readbuf_size = head->read_avail;
1628 head->read_buf = buf;
1629 head->read_step++;
1630 } else {
1631 kfree(buf);
1632 }
1633 return 0;
1634 }
1635
1636 /**
1637 * tomoyo_write_answer - Write the supervisor's decision.
1638 *
1639 * @head: Pointer to "struct tomoyo_io_buffer".
1640 *
1641 * Returns 0 on success, -EINVAL otherwise.
1642 */
1643 static int tomoyo_write_answer(struct tomoyo_io_buffer *head)
1644 {
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);
1653 ptr->timer = 0;
1654 }
1655 spin_unlock(&tomoyo_query_list_lock);
1656 if (sscanf(data, "A%u=%u", &serial, &answer) != 2)
1657 return -EINVAL;
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)
1663 continue;
1664 if (!ptr->answer)
1665 ptr->answer = answer;
1666 break;
1667 }
1668 spin_unlock(&tomoyo_query_list_lock);
1669 return 0;
1670 }
1671
1672 /**
1673 * tomoyo_read_version: Get version.
1674 *
1675 * @head: Pointer to "struct tomoyo_io_buffer".
1676 *
1677 * Returns version information.
1678 */
1679 static int tomoyo_read_version(struct tomoyo_io_buffer *head)
1680 {
1681 if (!head->read_eof) {
1682 tomoyo_io_printf(head, "2.3.0-pre");
1683 head->read_eof = true;
1684 }
1685 return 0;
1686 }
1687
1688 /**
1689 * tomoyo_read_self_domain - Get the current process's domainname.
1690 *
1691 * @head: Pointer to "struct tomoyo_io_buffer".
1692 *
1693 * Returns the current process's domainname.
1694 */
1695 static int tomoyo_read_self_domain(struct tomoyo_io_buffer *head)
1696 {
1697 if (!head->read_eof) {
1698 /*
1699 * tomoyo_domain()->domainname != NULL
1700 * because every process belongs to a domain and
1701 * the domain's name cannot be NULL.
1702 */
1703 tomoyo_io_printf(head, "%s", tomoyo_domain()->domainname->name);
1704 head->read_eof = true;
1705 }
1706 return 0;
1707 }
1708
1709 /**
1710 * tomoyo_open_control - open() for /sys/kernel/security/tomoyo/ interface.
1711 *
1712 * @type: Type of interface.
1713 * @file: Pointer to "struct file".
1714 *
1715 * Associates policy handler and returns 0 on success, -ENOMEM otherwise.
1716 *
1717 * Caller acquires tomoyo_read_lock().
1718 */
1719 int tomoyo_open_control(const u8 type, struct file *file)
1720 {
1721 struct tomoyo_io_buffer *head = kzalloc(sizeof(*head), GFP_NOFS);
1722
1723 if (!head)
1724 return -ENOMEM;
1725 mutex_init(&head->io_sem);
1726 head->type = type;
1727 switch (type) {
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;
1732 break;
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;
1737 break;
1738 case TOMOYO_SELFDOMAIN:
1739 /* /sys/kernel/security/tomoyo/self_domain */
1740 head->read = tomoyo_read_self_domain;
1741 break;
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;
1746 break;
1747 case TOMOYO_PROCESS_STATUS:
1748 /* /sys/kernel/security/tomoyo/.process_status */
1749 head->write = tomoyo_write_pid;
1750 head->read = tomoyo_read_pid;
1751 break;
1752 case TOMOYO_VERSION:
1753 /* /sys/kernel/security/tomoyo/version */
1754 head->read = tomoyo_read_version;
1755 head->readbuf_size = 128;
1756 break;
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;
1762 break;
1763 case TOMOYO_PROFILE:
1764 /* /sys/kernel/security/tomoyo/profile */
1765 head->write = tomoyo_write_profile;
1766 head->read = tomoyo_read_profile;
1767 break;
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;
1772 break;
1773 case TOMOYO_MANAGER:
1774 /* /sys/kernel/security/tomoyo/manager */
1775 head->write = tomoyo_write_manager_policy;
1776 head->read = tomoyo_read_manager_policy;
1777 break;
1778 }
1779 if (!(file->f_mode & FMODE_READ)) {
1780 /*
1781 * No need to allocate read_buf since it is not opened
1782 * for reading.
1783 */
1784 head->read = NULL;
1785 head->poll = NULL;
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) {
1792 kfree(head);
1793 return -ENOMEM;
1794 }
1795 }
1796 if (!(file->f_mode & FMODE_WRITE)) {
1797 /*
1798 * No need to allocate write_buf since it is not opened
1799 * for writing.
1800 */
1801 head->write = NULL;
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);
1807 kfree(head);
1808 return -ENOMEM;
1809 }
1810 }
1811 if (type != TOMOYO_QUERY)
1812 head->reader_idx = tomoyo_read_lock();
1813 file->private_data = head;
1814 /*
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.
1820 */
1821 if (type == TOMOYO_SELFDOMAIN)
1822 tomoyo_read_control(file, NULL, 0);
1823 /*
1824 * If the file is /sys/kernel/security/tomoyo/query , increment the
1825 * observer counter.
1826 * The obserber counter is used by tomoyo_supervisor() to see if
1827 * there is some process monitoring /sys/kernel/security/tomoyo/query.
1828 */
1829 else if (type == TOMOYO_QUERY)
1830 atomic_inc(&tomoyo_query_observers);
1831 return 0;
1832 }
1833
1834 /**
1835 * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
1836 *
1837 * @file: Pointer to "struct file".
1838 * @wait: Pointer to "poll_table".
1839 *
1840 * Waits for read readiness.
1841 * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd .
1842 */
1843 int tomoyo_poll_control(struct file *file, poll_table *wait)
1844 {
1845 struct tomoyo_io_buffer *head = file->private_data;
1846 if (!head->poll)
1847 return -ENOSYS;
1848 return head->poll(file, wait);
1849 }
1850
1851 /**
1852 * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
1853 *
1854 * @file: Pointer to "struct file".
1855 * @buffer: Poiner to buffer to write to.
1856 * @buffer_len: Size of @buffer.
1857 *
1858 * Returns bytes read on success, negative value otherwise.
1859 *
1860 * Caller holds tomoyo_read_lock().
1861 */
1862 int tomoyo_read_control(struct file *file, char __user *buffer,
1863 const int buffer_len)
1864 {
1865 int len = 0;
1866 struct tomoyo_io_buffer *head = file->private_data;
1867 char *cp;
1868
1869 if (!head->read)
1870 return -ENOSYS;
1871 if (mutex_lock_interruptible(&head->io_sem))
1872 return -EINTR;
1873 /* Call the policy handler. */
1874 len = head->read(head);
1875 if (len < 0)
1876 goto out;
1877 /* Write to buffer. */
1878 len = head->read_avail;
1879 if (len > buffer_len)
1880 len = buffer_len;
1881 if (!len)
1882 goto out;
1883 /* head->read_buf changes by some functions. */
1884 cp = head->read_buf;
1885 if (copy_to_user(buffer, cp, len)) {
1886 len = -EFAULT;
1887 goto out;
1888 }
1889 head->read_avail -= len;
1890 memmove(cp, cp + len, head->read_avail);
1891 out:
1892 mutex_unlock(&head->io_sem);
1893 return len;
1894 }
1895
1896 /**
1897 * tomoyo_write_control - write() for /sys/kernel/security/tomoyo/ interface.
1898 *
1899 * @file: Pointer to "struct file".
1900 * @buffer: Pointer to buffer to read from.
1901 * @buffer_len: Size of @buffer.
1902 *
1903 * Returns @buffer_len on success, negative value otherwise.
1904 *
1905 * Caller holds tomoyo_read_lock().
1906 */
1907 int tomoyo_write_control(struct file *file, const char __user *buffer,
1908 const int buffer_len)
1909 {
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;
1914
1915 if (!head->write)
1916 return -ENOSYS;
1917 if (!access_ok(VERIFY_READ, buffer, buffer_len))
1918 return -EFAULT;
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())
1923 return -EPERM;
1924 if (mutex_lock_interruptible(&head->io_sem))
1925 return -EINTR;
1926 /* Read a line and dispatch it to the policy handler. */
1927 while (avail_len > 0) {
1928 char c;
1929 if (head->write_avail >= head->writebuf_size - 1) {
1930 error = -ENOMEM;
1931 break;
1932 } else if (get_user(c, buffer)) {
1933 error = -EFAULT;
1934 break;
1935 }
1936 buffer++;
1937 avail_len--;
1938 cp0[head->write_avail++] = c;
1939 if (c != '\n')
1940 continue;
1941 cp0[head->write_avail - 1] = '\0';
1942 head->write_avail = 0;
1943 tomoyo_normalize_line(cp0);
1944 head->write(head);
1945 }
1946 mutex_unlock(&head->io_sem);
1947 return error;
1948 }
1949
1950 /**
1951 * tomoyo_close_control - close() for /sys/kernel/security/tomoyo/ interface.
1952 *
1953 * @file: Pointer to "struct file".
1954 *
1955 * Releases memory and returns 0.
1956 *
1957 * Caller looses tomoyo_read_lock().
1958 */
1959 int tomoyo_close_control(struct file *file)
1960 {
1961 struct tomoyo_io_buffer *head = file->private_data;
1962 const bool is_write = !!head->write_buf;
1963
1964 /*
1965 * If the file is /sys/kernel/security/tomoyo/query , decrement the
1966 * observer counter.
1967 */
1968 if (head->type == TOMOYO_QUERY)
1969 atomic_dec(&tomoyo_query_observers);
1970 else
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;
1977 kfree(head);
1978 head = NULL;
1979 file->private_data = NULL;
1980 if (is_write)
1981 tomoyo_run_gc();
1982 return 0;
1983 }
1984
1985 /**
1986 * tomoyo_check_profile - Check all profiles currently assigned to domains are defined.
1987 */
1988 void tomoyo_check_profile(void)
1989 {
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])
1997 continue;
1998 panic("Profile %u (used by '%s') not defined.\n",
1999 profile, domain->domainname->name);
2000 }
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");
2007 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree