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hv: rename prep_negotiate_resp() to vmbus_prep_negotiate_resp()
[zen-stable.git] / security / tomoyo / condition.c
blob8a05f71eaf6744a71116f4afe39f9a4a8fb23074
1 /*
2 * security/tomoyo/condition.c
3 *
4 * Copyright (C) 2005-2011 NTT DATA CORPORATION
5 */
6
7 #include "common.h"
8 #include <linux/slab.h>
9
10 /* List of "struct tomoyo_condition". */
11 LIST_HEAD(tomoyo_condition_list);
12
13 /**
14 * tomoyo_argv - Check argv[] in "struct linux_binbrm".
15 *
16 * @index: Index number of @arg_ptr.
17 * @arg_ptr: Contents of argv[@index].
18 * @argc: Length of @argv.
19 * @argv: Pointer to "struct tomoyo_argv".
20 * @checked: Set to true if @argv[@index] was found.
21 *
22 * Returns true on success, false otherwise.
23 */
24 static bool tomoyo_argv(const unsigned int index, const char *arg_ptr,
25 const int argc, const struct tomoyo_argv *argv,
26 u8 *checked)
27 {
28 int i;
29 struct tomoyo_path_info arg;
30 arg.name = arg_ptr;
31 for (i = 0; i < argc; argv++, checked++, i++) {
32 bool result;
33 if (index != argv->index)
34 continue;
35 *checked = 1;
36 tomoyo_fill_path_info(&arg);
37 result = tomoyo_path_matches_pattern(&arg, argv->value);
38 if (argv->is_not)
39 result = !result;
40 if (!result)
41 return false;
42 }
43 return true;
44 }
45
46 /**
47 * tomoyo_envp - Check envp[] in "struct linux_binbrm".
48 *
49 * @env_name: The name of environment variable.
50 * @env_value: The value of environment variable.
51 * @envc: Length of @envp.
52 * @envp: Pointer to "struct tomoyo_envp".
53 * @checked: Set to true if @envp[@env_name] was found.
54 *
55 * Returns true on success, false otherwise.
56 */
57 static bool tomoyo_envp(const char *env_name, const char *env_value,
58 const int envc, const struct tomoyo_envp *envp,
59 u8 *checked)
60 {
61 int i;
62 struct tomoyo_path_info name;
63 struct tomoyo_path_info value;
64 name.name = env_name;
65 tomoyo_fill_path_info(&name);
66 value.name = env_value;
67 tomoyo_fill_path_info(&value);
68 for (i = 0; i < envc; envp++, checked++, i++) {
69 bool result;
70 if (!tomoyo_path_matches_pattern(&name, envp->name))
71 continue;
72 *checked = 1;
73 if (envp->value) {
74 result = tomoyo_path_matches_pattern(&value,
75 envp->value);
76 if (envp->is_not)
77 result = !result;
78 } else {
79 result = true;
80 if (!envp->is_not)
81 result = !result;
82 }
83 if (!result)
84 return false;
85 }
86 return true;
87 }
88
89 /**
90 * tomoyo_scan_bprm - Scan "struct linux_binprm".
91 *
92 * @ee: Pointer to "struct tomoyo_execve".
93 * @argc: Length of @argc.
94 * @argv: Pointer to "struct tomoyo_argv".
95 * @envc: Length of @envp.
96 * @envp: Poiner to "struct tomoyo_envp".
97 *
98 * Returns true on success, false otherwise.
99 */
100 static bool tomoyo_scan_bprm(struct tomoyo_execve *ee,
101 const u16 argc, const struct tomoyo_argv *argv,
102 const u16 envc, const struct tomoyo_envp *envp)
103 {
104 struct linux_binprm *bprm = ee->bprm;
105 struct tomoyo_page_dump *dump = &ee->dump;
106 char *arg_ptr = ee->tmp;
107 int arg_len = 0;
108 unsigned long pos = bprm->p;
109 int offset = pos % PAGE_SIZE;
110 int argv_count = bprm->argc;
111 int envp_count = bprm->envc;
112 bool result = true;
113 u8 local_checked[32];
114 u8 *checked;
115 if (argc + envc <= sizeof(local_checked)) {
116 checked = local_checked;
117 memset(local_checked, 0, sizeof(local_checked));
118 } else {
119 checked = kzalloc(argc + envc, GFP_NOFS);
120 if (!checked)
121 return false;
122 }
123 while (argv_count || envp_count) {
124 if (!tomoyo_dump_page(bprm, pos, dump)) {
125 result = false;
126 goto out;
127 }
128 pos += PAGE_SIZE - offset;
129 while (offset < PAGE_SIZE) {
130 /* Read. */
131 const char *kaddr = dump->data;
132 const unsigned char c = kaddr[offset++];
133 if (c && arg_len < TOMOYO_EXEC_TMPSIZE - 10) {
134 if (c == '\\') {
135 arg_ptr[arg_len++] = '\\';
136 arg_ptr[arg_len++] = '\\';
137 } else if (c > ' ' && c < 127) {
138 arg_ptr[arg_len++] = c;
139 } else {
140 arg_ptr[arg_len++] = '\\';
141 arg_ptr[arg_len++] = (c >> 6) + '0';
142 arg_ptr[arg_len++] =
143 ((c >> 3) & 7) + '0';
144 arg_ptr[arg_len++] = (c & 7) + '0';
145 }
146 } else {
147 arg_ptr[arg_len] = '\0';
148 }
149 if (c)
150 continue;
151 /* Check. */
152 if (argv_count) {
153 if (!tomoyo_argv(bprm->argc - argv_count,
154 arg_ptr, argc, argv,
155 checked)) {
156 result = false;
157 break;
158 }
159 argv_count--;
160 } else if (envp_count) {
161 char *cp = strchr(arg_ptr, '=');
162 if (cp) {
163 *cp = '\0';
164 if (!tomoyo_envp(arg_ptr, cp + 1,
165 envc, envp,
166 checked + argc)) {
167 result = false;
168 break;
169 }
170 }
171 envp_count--;
172 } else {
173 break;
174 }
175 arg_len = 0;
176 }
177 offset = 0;
178 if (!result)
179 break;
180 }
181 out:
182 if (result) {
183 int i;
184 /* Check not-yet-checked entries. */
185 for (i = 0; i < argc; i++) {
186 if (checked[i])
187 continue;
188 /*
189 * Return true only if all unchecked indexes in
190 * bprm->argv[] are not matched.
191 */
192 if (argv[i].is_not)
193 continue;
194 result = false;
195 break;
196 }
197 for (i = 0; i < envc; envp++, i++) {
198 if (checked[argc + i])
199 continue;
200 /*
201 * Return true only if all unchecked environ variables
202 * in bprm->envp[] are either undefined or not matched.
203 */
204 if ((!envp->value && !envp->is_not) ||
205 (envp->value && envp->is_not))
206 continue;
207 result = false;
208 break;
209 }
210 }
211 if (checked != local_checked)
212 kfree(checked);
213 return result;
214 }
215
216 /**
217 * tomoyo_scan_exec_realpath - Check "exec.realpath" parameter of "struct tomoyo_condition".
218 *
219 * @file: Pointer to "struct file".
220 * @ptr: Pointer to "struct tomoyo_name_union".
221 * @match: True if "exec.realpath=", false if "exec.realpath!=".
222 *
223 * Returns true on success, false otherwise.
224 */
225 static bool tomoyo_scan_exec_realpath(struct file *file,
226 const struct tomoyo_name_union *ptr,
227 const bool match)
228 {
229 bool result;
230 struct tomoyo_path_info exe;
231 if (!file)
232 return false;
233 exe.name = tomoyo_realpath_from_path(&file->f_path);
234 if (!exe.name)
235 return false;
236 tomoyo_fill_path_info(&exe);
237 result = tomoyo_compare_name_union(&exe, ptr);
238 kfree(exe.name);
239 return result == match;
240 }
241
242 /**
243 * tomoyo_get_dqword - tomoyo_get_name() for a quoted string.
244 *
245 * @start: String to save.
246 *
247 * Returns pointer to "struct tomoyo_path_info" on success, NULL otherwise.
248 */
249 static const struct tomoyo_path_info *tomoyo_get_dqword(char *start)
250 {
251 char *cp = start + strlen(start) - 1;
252 if (cp == start || *start++ != '"' || *cp != '"')
253 return NULL;
254 *cp = '\0';
255 if (*start && !tomoyo_correct_word(start))
256 return NULL;
257 return tomoyo_get_name(start);
258 }
259
260 /**
261 * tomoyo_parse_name_union_quoted - Parse a quoted word.
262 *
263 * @param: Pointer to "struct tomoyo_acl_param".
264 * @ptr: Pointer to "struct tomoyo_name_union".
265 *
266 * Returns true on success, false otherwise.
267 */
268 static bool tomoyo_parse_name_union_quoted(struct tomoyo_acl_param *param,
269 struct tomoyo_name_union *ptr)
270 {
271 char *filename = param->data;
272 if (*filename == '@')
273 return tomoyo_parse_name_union(param, ptr);
274 ptr->filename = tomoyo_get_dqword(filename);
275 return ptr->filename != NULL;
276 }
277
278 /**
279 * tomoyo_parse_argv - Parse an argv[] condition part.
280 *
281 * @left: Lefthand value.
282 * @right: Righthand value.
283 * @argv: Pointer to "struct tomoyo_argv".
284 *
285 * Returns true on success, false otherwise.
286 */
287 static bool tomoyo_parse_argv(char *left, char *right,
288 struct tomoyo_argv *argv)
289 {
290 if (tomoyo_parse_ulong(&argv->index, &left) !=
291 TOMOYO_VALUE_TYPE_DECIMAL || *left++ != ']' || *left)
292 return false;
293 argv->value = tomoyo_get_dqword(right);
294 return argv->value != NULL;
295 }
296
297 /**
298 * tomoyo_parse_envp - Parse an envp[] condition part.
299 *
300 * @left: Lefthand value.
301 * @right: Righthand value.
302 * @envp: Pointer to "struct tomoyo_envp".
303 *
304 * Returns true on success, false otherwise.
305 */
306 static bool tomoyo_parse_envp(char *left, char *right,
307 struct tomoyo_envp *envp)
308 {
309 const struct tomoyo_path_info *name;
310 const struct tomoyo_path_info *value;
311 char *cp = left + strlen(left) - 1;
312 if (*cp-- != ']' || *cp != '"')
313 goto out;
314 *cp = '\0';
315 if (!tomoyo_correct_word(left))
316 goto out;
317 name = tomoyo_get_name(left);
318 if (!name)
319 goto out;
320 if (!strcmp(right, "NULL")) {
321 value = NULL;
322 } else {
323 value = tomoyo_get_dqword(right);
324 if (!value) {
325 tomoyo_put_name(name);
326 goto out;
327 }
328 }
329 envp->name = name;
330 envp->value = value;
331 return true;
332 out:
333 return false;
334 }
335
336 /**
337 * tomoyo_same_condition - Check for duplicated "struct tomoyo_condition" entry.
338 *
339 * @a: Pointer to "struct tomoyo_condition".
340 * @b: Pointer to "struct tomoyo_condition".
341 *
342 * Returns true if @a == @b, false otherwise.
343 */
344 static inline bool tomoyo_same_condition(const struct tomoyo_condition *a,
345 const struct tomoyo_condition *b)
346 {
347 return a->size == b->size && a->condc == b->condc &&
348 a->numbers_count == b->numbers_count &&
349 a->names_count == b->names_count &&
350 a->argc == b->argc && a->envc == b->envc &&
351 !memcmp(a + 1, b + 1, a->size - sizeof(*a));
352 }
353
354 /**
355 * tomoyo_condition_type - Get condition type.
356 *
357 * @word: Keyword string.
358 *
359 * Returns one of values in "enum tomoyo_conditions_index" on success,
360 * TOMOYO_MAX_CONDITION_KEYWORD otherwise.
361 */
362 static u8 tomoyo_condition_type(const char *word)
363 {
364 u8 i;
365 for (i = 0; i < TOMOYO_MAX_CONDITION_KEYWORD; i++) {
366 if (!strcmp(word, tomoyo_condition_keyword[i]))
367 break;
368 }
369 return i;
370 }
371
372 /* Define this to enable debug mode. */
373 /* #define DEBUG_CONDITION */
374
375 #ifdef DEBUG_CONDITION
376 #define dprintk printk
377 #else
378 #define dprintk(...) do { } while (0)
379 #endif
380
381 /**
382 * tomoyo_commit_condition - Commit "struct tomoyo_condition".
383 *
384 * @entry: Pointer to "struct tomoyo_condition".
385 *
386 * Returns pointer to "struct tomoyo_condition" on success, NULL otherwise.
387 *
388 * This function merges duplicated entries. This function returns NULL if
389 * @entry is not duplicated but memory quota for policy has exceeded.
390 */
391 static struct tomoyo_condition *tomoyo_commit_condition
392 (struct tomoyo_condition *entry)
393 {
394 struct tomoyo_condition *ptr;
395 bool found = false;
396 if (mutex_lock_interruptible(&tomoyo_policy_lock)) {
397 dprintk(KERN_WARNING "%u: %s failed\n", __LINE__, __func__);
398 ptr = NULL;
399 found = true;
400 goto out;
401 }
402 list_for_each_entry_rcu(ptr, &tomoyo_condition_list, head.list) {
403 if (!tomoyo_same_condition(ptr, entry))
404 continue;
405 /* Same entry found. Share this entry. */
406 atomic_inc(&ptr->head.users);
407 found = true;
408 break;
409 }
410 if (!found) {
411 if (tomoyo_memory_ok(entry)) {
412 atomic_set(&entry->head.users, 1);
413 list_add_rcu(&entry->head.list,
414 &tomoyo_condition_list);
415 } else {
416 found = true;
417 ptr = NULL;
418 }
419 }
420 mutex_unlock(&tomoyo_policy_lock);
421 out:
422 if (found) {
423 tomoyo_del_condition(&entry->head.list);
424 kfree(entry);
425 entry = ptr;
426 }
427 return entry;
428 }
429
430 /**
431 * tomoyo_get_condition - Parse condition part.
432 *
433 * @param: Pointer to "struct tomoyo_acl_param".
434 *
435 * Returns pointer to "struct tomoyo_condition" on success, NULL otherwise.
436 */
437 struct tomoyo_condition *tomoyo_get_condition(struct tomoyo_acl_param *param)
438 {
439 struct tomoyo_condition *entry = NULL;
440 struct tomoyo_condition_element *condp = NULL;
441 struct tomoyo_number_union *numbers_p = NULL;
442 struct tomoyo_name_union *names_p = NULL;
443 struct tomoyo_argv *argv = NULL;
444 struct tomoyo_envp *envp = NULL;
445 struct tomoyo_condition e = { };
446 char * const start_of_string = param->data;
447 char * const end_of_string = start_of_string + strlen(start_of_string);
448 char *pos;
449 rerun:
450 pos = start_of_string;
451 while (1) {
452 u8 left = -1;
453 u8 right = -1;
454 char *left_word = pos;
455 char *cp;
456 char *right_word;
457 bool is_not;
458 if (!*left_word)
459 break;
460 /*
461 * Since left-hand condition does not allow use of "path_group"
462 * or "number_group" and environment variable's names do not
463 * accept '=', it is guaranteed that the original line consists
464 * of one or more repetition of $left$operator$right blocks
465 * where "$left is free from '=' and ' '" and "$operator is
466 * either '=' or '!='" and "$right is free from ' '".
467 * Therefore, we can reconstruct the original line at the end
468 * of dry run even if we overwrite $operator with '\0'.
469 */
470 cp = strchr(pos, ' ');
471 if (cp) {
472 *cp = '\0'; /* Will restore later. */
473 pos = cp + 1;
474 } else {
475 pos = "";
476 }
477 right_word = strchr(left_word, '=');
478 if (!right_word || right_word == left_word)
479 goto out;
480 is_not = *(right_word - 1) == '!';
481 if (is_not)
482 *(right_word++ - 1) = '\0'; /* Will restore later. */
483 else if (*(right_word + 1) != '=')
484 *right_word++ = '\0'; /* Will restore later. */
485 else
486 goto out;
487 dprintk(KERN_WARNING "%u: <%s>%s=<%s>\n", __LINE__, left_word,
488 is_not ? "!" : "", right_word);
489 if (!strncmp(left_word, "exec.argv[", 10)) {
490 if (!argv) {
491 e.argc++;
492 e.condc++;
493 } else {
494 e.argc--;
495 e.condc--;
496 left = TOMOYO_ARGV_ENTRY;
497 argv->is_not = is_not;
498 if (!tomoyo_parse_argv(left_word + 10,
499 right_word, argv++))
500 goto out;
501 }
502 goto store_value;
503 }
504 if (!strncmp(left_word, "exec.envp[\"", 11)) {
505 if (!envp) {
506 e.envc++;
507 e.condc++;
508 } else {
509 e.envc--;
510 e.condc--;
511 left = TOMOYO_ENVP_ENTRY;
512 envp->is_not = is_not;
513 if (!tomoyo_parse_envp(left_word + 11,
514 right_word, envp++))
515 goto out;
516 }
517 goto store_value;
518 }
519 left = tomoyo_condition_type(left_word);
520 dprintk(KERN_WARNING "%u: <%s> left=%u\n", __LINE__, left_word,
521 left);
522 if (left == TOMOYO_MAX_CONDITION_KEYWORD) {
523 if (!numbers_p) {
524 e.numbers_count++;
525 } else {
526 e.numbers_count--;
527 left = TOMOYO_NUMBER_UNION;
528 param->data = left_word;
529 if (*left_word == '@' ||
530 !tomoyo_parse_number_union(param,
531 numbers_p++))
532 goto out;
533 }
534 }
535 if (!condp)
536 e.condc++;
537 else
538 e.condc--;
539 if (left == TOMOYO_EXEC_REALPATH ||
540 left == TOMOYO_SYMLINK_TARGET) {
541 if (!names_p) {
542 e.names_count++;
543 } else {
544 e.names_count--;
545 right = TOMOYO_NAME_UNION;
546 param->data = right_word;
547 if (!tomoyo_parse_name_union_quoted(param,
548 names_p++))
549 goto out;
550 }
551 goto store_value;
552 }
553 right = tomoyo_condition_type(right_word);
554 if (right == TOMOYO_MAX_CONDITION_KEYWORD) {
555 if (!numbers_p) {
556 e.numbers_count++;
557 } else {
558 e.numbers_count--;
559 right = TOMOYO_NUMBER_UNION;
560 param->data = right_word;
561 if (!tomoyo_parse_number_union(param,
562 numbers_p++))
563 goto out;
564 }
565 }
566 store_value:
567 if (!condp) {
568 dprintk(KERN_WARNING "%u: dry_run left=%u right=%u "
569 "match=%u\n", __LINE__, left, right, !is_not);
570 continue;
571 }
572 condp->left = left;
573 condp->right = right;
574 condp->equals = !is_not;
575 dprintk(KERN_WARNING "%u: left=%u right=%u match=%u\n",
576 __LINE__, condp->left, condp->right,
577 condp->equals);
578 condp++;
579 }
580 dprintk(KERN_INFO "%u: cond=%u numbers=%u names=%u ac=%u ec=%u\n",
581 __LINE__, e.condc, e.numbers_count, e.names_count, e.argc,
582 e.envc);
583 if (entry) {
584 BUG_ON(e.names_count | e.numbers_count | e.argc | e.envc |
585 e.condc);
586 return tomoyo_commit_condition(entry);
587 }
588 e.size = sizeof(*entry)
589 + e.condc * sizeof(struct tomoyo_condition_element)
590 + e.numbers_count * sizeof(struct tomoyo_number_union)
591 + e.names_count * sizeof(struct tomoyo_name_union)
592 + e.argc * sizeof(struct tomoyo_argv)
593 + e.envc * sizeof(struct tomoyo_envp);
594 entry = kzalloc(e.size, GFP_NOFS);
595 if (!entry)
596 return NULL;
597 *entry = e;
598 condp = (struct tomoyo_condition_element *) (entry + 1);
599 numbers_p = (struct tomoyo_number_union *) (condp + e.condc);
600 names_p = (struct tomoyo_name_union *) (numbers_p + e.numbers_count);
601 argv = (struct tomoyo_argv *) (names_p + e.names_count);
602 envp = (struct tomoyo_envp *) (argv + e.argc);
603 {
604 bool flag = false;
605 for (pos = start_of_string; pos < end_of_string; pos++) {
606 if (*pos)
607 continue;
608 if (flag) /* Restore " ". */
609 *pos = ' ';
610 else if (*(pos + 1) == '=') /* Restore "!=". */
611 *pos = '!';
612 else /* Restore "=". */
613 *pos = '=';
614 flag = !flag;
615 }
616 }
617 goto rerun;
618 out:
619 dprintk(KERN_WARNING "%u: %s failed\n", __LINE__, __func__);
620 if (entry) {
621 tomoyo_del_condition(&entry->head.list);
622 kfree(entry);
623 }
624 return NULL;
625 }
626
627 /**
628 * tomoyo_get_attributes - Revalidate "struct inode".
629 *
630 * @obj: Pointer to "struct tomoyo_obj_info".
631 *
632 * Returns nothing.
633 */
634 void tomoyo_get_attributes(struct tomoyo_obj_info *obj)
635 {
636 u8 i;
637 struct dentry *dentry = NULL;
638
639 for (i = 0; i < TOMOYO_MAX_PATH_STAT; i++) {
640 struct inode *inode;
641 switch (i) {
642 case TOMOYO_PATH1:
643 dentry = obj->path1.dentry;
644 if (!dentry)
645 continue;
646 break;
647 case TOMOYO_PATH2:
648 dentry = obj->path2.dentry;
649 if (!dentry)
650 continue;
651 break;
652 default:
653 if (!dentry)
654 continue;
655 dentry = dget_parent(dentry);
656 break;
657 }
658 inode = dentry->d_inode;
659 if (inode) {
660 struct tomoyo_mini_stat *stat = &obj->stat[i];
661 stat->uid = inode->i_uid;
662 stat->gid = inode->i_gid;
663 stat->ino = inode->i_ino;
664 stat->mode = inode->i_mode;
665 stat->dev = inode->i_sb->s_dev;
666 stat->rdev = inode->i_rdev;
667 obj->stat_valid[i] = true;
668 }
669 if (i & 1) /* i == TOMOYO_PATH1_PARENT ||
670 i == TOMOYO_PATH2_PARENT */
671 dput(dentry);
672 }
673 }
674
675 /**
676 * tomoyo_condition - Check condition part.
677 *
678 * @r: Pointer to "struct tomoyo_request_info".
679 * @cond: Pointer to "struct tomoyo_condition". Maybe NULL.
680 *
681 * Returns true on success, false otherwise.
682 *
683 * Caller holds tomoyo_read_lock().
684 */
685 bool tomoyo_condition(struct tomoyo_request_info *r,
686 const struct tomoyo_condition *cond)
687 {
688 u32 i;
689 unsigned long min_v[2] = { 0, 0 };
690 unsigned long max_v[2] = { 0, 0 };
691 const struct tomoyo_condition_element *condp;
692 const struct tomoyo_number_union *numbers_p;
693 const struct tomoyo_name_union *names_p;
694 const struct tomoyo_argv *argv;
695 const struct tomoyo_envp *envp;
696 struct tomoyo_obj_info *obj;
697 u16 condc;
698 u16 argc;
699 u16 envc;
700 struct linux_binprm *bprm = NULL;
701 if (!cond)
702 return true;
703 condc = cond->condc;
704 argc = cond->argc;
705 envc = cond->envc;
706 obj = r->obj;
707 if (r->ee)
708 bprm = r->ee->bprm;
709 if (!bprm && (argc || envc))
710 return false;
711 condp = (struct tomoyo_condition_element *) (cond + 1);
712 numbers_p = (const struct tomoyo_number_union *) (condp + condc);
713 names_p = (const struct tomoyo_name_union *)
714 (numbers_p + cond->numbers_count);
715 argv = (const struct tomoyo_argv *) (names_p + cond->names_count);
716 envp = (const struct tomoyo_envp *) (argv + argc);
717 for (i = 0; i < condc; i++) {
718 const bool match = condp->equals;
719 const u8 left = condp->left;
720 const u8 right = condp->right;
721 bool is_bitop[2] = { false, false };
722 u8 j;
723 condp++;
724 /* Check argv[] and envp[] later. */
725 if (left == TOMOYO_ARGV_ENTRY || left == TOMOYO_ENVP_ENTRY)
726 continue;
727 /* Check string expressions. */
728 if (right == TOMOYO_NAME_UNION) {
729 const struct tomoyo_name_union *ptr = names_p++;
730 switch (left) {
731 struct tomoyo_path_info *symlink;
732 struct tomoyo_execve *ee;
733 struct file *file;
734 case TOMOYO_SYMLINK_TARGET:
735 symlink = obj ? obj->symlink_target : NULL;
736 if (!symlink ||
737 !tomoyo_compare_name_union(symlink, ptr)
738 == match)
739 goto out;
740 break;
741 case TOMOYO_EXEC_REALPATH:
742 ee = r->ee;
743 file = ee ? ee->bprm->file : NULL;
744 if (!tomoyo_scan_exec_realpath(file, ptr,
745 match))
746 goto out;
747 break;
748 }
749 continue;
750 }
751 /* Check numeric or bit-op expressions. */
752 for (j = 0; j < 2; j++) {
753 const u8 index = j ? right : left;
754 unsigned long value = 0;
755 switch (index) {
756 case TOMOYO_TASK_UID:
757 value = current_uid();
758 break;
759 case TOMOYO_TASK_EUID:
760 value = current_euid();
761 break;
762 case TOMOYO_TASK_SUID:
763 value = current_suid();
764 break;
765 case TOMOYO_TASK_FSUID:
766 value = current_fsuid();
767 break;
768 case TOMOYO_TASK_GID:
769 value = current_gid();
770 break;
771 case TOMOYO_TASK_EGID:
772 value = current_egid();
773 break;
774 case TOMOYO_TASK_SGID:
775 value = current_sgid();
776 break;
777 case TOMOYO_TASK_FSGID:
778 value = current_fsgid();
779 break;
780 case TOMOYO_TASK_PID:
781 value = tomoyo_sys_getpid();
782 break;
783 case TOMOYO_TASK_PPID:
784 value = tomoyo_sys_getppid();
785 break;
786 case TOMOYO_TYPE_IS_SOCKET:
787 value = S_IFSOCK;
788 break;
789 case TOMOYO_TYPE_IS_SYMLINK:
790 value = S_IFLNK;
791 break;
792 case TOMOYO_TYPE_IS_FILE:
793 value = S_IFREG;
794 break;
795 case TOMOYO_TYPE_IS_BLOCK_DEV:
796 value = S_IFBLK;
797 break;
798 case TOMOYO_TYPE_IS_DIRECTORY:
799 value = S_IFDIR;
800 break;
801 case TOMOYO_TYPE_IS_CHAR_DEV:
802 value = S_IFCHR;
803 break;
804 case TOMOYO_TYPE_IS_FIFO:
805 value = S_IFIFO;
806 break;
807 case TOMOYO_MODE_SETUID:
808 value = S_ISUID;
809 break;
810 case TOMOYO_MODE_SETGID:
811 value = S_ISGID;
812 break;
813 case TOMOYO_MODE_STICKY:
814 value = S_ISVTX;
815 break;
816 case TOMOYO_MODE_OWNER_READ:
817 value = S_IRUSR;
818 break;
819 case TOMOYO_MODE_OWNER_WRITE:
820 value = S_IWUSR;
821 break;
822 case TOMOYO_MODE_OWNER_EXECUTE:
823 value = S_IXUSR;
824 break;
825 case TOMOYO_MODE_GROUP_READ:
826 value = S_IRGRP;
827 break;
828 case TOMOYO_MODE_GROUP_WRITE:
829 value = S_IWGRP;
830 break;
831 case TOMOYO_MODE_GROUP_EXECUTE:
832 value = S_IXGRP;
833 break;
834 case TOMOYO_MODE_OTHERS_READ:
835 value = S_IROTH;
836 break;
837 case TOMOYO_MODE_OTHERS_WRITE:
838 value = S_IWOTH;
839 break;
840 case TOMOYO_MODE_OTHERS_EXECUTE:
841 value = S_IXOTH;
842 break;
843 case TOMOYO_EXEC_ARGC:
844 if (!bprm)
845 goto out;
846 value = bprm->argc;
847 break;
848 case TOMOYO_EXEC_ENVC:
849 if (!bprm)
850 goto out;
851 value = bprm->envc;
852 break;
853 case TOMOYO_NUMBER_UNION:
854 /* Fetch values later. */
855 break;
856 default:
857 if (!obj)
858 goto out;
859 if (!obj->validate_done) {
860 tomoyo_get_attributes(obj);
861 obj->validate_done = true;
862 }
863 {
864 u8 stat_index;
865 struct tomoyo_mini_stat *stat;
866 switch (index) {
867 case TOMOYO_PATH1_UID:
868 case TOMOYO_PATH1_GID:
869 case TOMOYO_PATH1_INO:
870 case TOMOYO_PATH1_MAJOR:
871 case TOMOYO_PATH1_MINOR:
872 case TOMOYO_PATH1_TYPE:
873 case TOMOYO_PATH1_DEV_MAJOR:
874 case TOMOYO_PATH1_DEV_MINOR:
875 case TOMOYO_PATH1_PERM:
876 stat_index = TOMOYO_PATH1;
877 break;
878 case TOMOYO_PATH2_UID:
879 case TOMOYO_PATH2_GID:
880 case TOMOYO_PATH2_INO:
881 case TOMOYO_PATH2_MAJOR:
882 case TOMOYO_PATH2_MINOR:
883 case TOMOYO_PATH2_TYPE:
884 case TOMOYO_PATH2_DEV_MAJOR:
885 case TOMOYO_PATH2_DEV_MINOR:
886 case TOMOYO_PATH2_PERM:
887 stat_index = TOMOYO_PATH2;
888 break;
889 case TOMOYO_PATH1_PARENT_UID:
890 case TOMOYO_PATH1_PARENT_GID:
891 case TOMOYO_PATH1_PARENT_INO:
892 case TOMOYO_PATH1_PARENT_PERM:
893 stat_index =
894 TOMOYO_PATH1_PARENT;
895 break;
896 case TOMOYO_PATH2_PARENT_UID:
897 case TOMOYO_PATH2_PARENT_GID:
898 case TOMOYO_PATH2_PARENT_INO:
899 case TOMOYO_PATH2_PARENT_PERM:
900 stat_index =
901 TOMOYO_PATH2_PARENT;
902 break;
903 default:
904 goto out;
905 }
906 if (!obj->stat_valid[stat_index])
907 goto out;
908 stat = &obj->stat[stat_index];
909 switch (index) {
910 case TOMOYO_PATH1_UID:
911 case TOMOYO_PATH2_UID:
912 case TOMOYO_PATH1_PARENT_UID:
913 case TOMOYO_PATH2_PARENT_UID:
914 value = stat->uid;
915 break;
916 case TOMOYO_PATH1_GID:
917 case TOMOYO_PATH2_GID:
918 case TOMOYO_PATH1_PARENT_GID:
919 case TOMOYO_PATH2_PARENT_GID:
920 value = stat->gid;
921 break;
922 case TOMOYO_PATH1_INO:
923 case TOMOYO_PATH2_INO:
924 case TOMOYO_PATH1_PARENT_INO:
925 case TOMOYO_PATH2_PARENT_INO:
926 value = stat->ino;
927 break;
928 case TOMOYO_PATH1_MAJOR:
929 case TOMOYO_PATH2_MAJOR:
930 value = MAJOR(stat->dev);
931 break;
932 case TOMOYO_PATH1_MINOR:
933 case TOMOYO_PATH2_MINOR:
934 value = MINOR(stat->dev);
935 break;
936 case TOMOYO_PATH1_TYPE:
937 case TOMOYO_PATH2_TYPE:
938 value = stat->mode & S_IFMT;
939 break;
940 case TOMOYO_PATH1_DEV_MAJOR:
941 case TOMOYO_PATH2_DEV_MAJOR:
942 value = MAJOR(stat->rdev);
943 break;
944 case TOMOYO_PATH1_DEV_MINOR:
945 case TOMOYO_PATH2_DEV_MINOR:
946 value = MINOR(stat->rdev);
947 break;
948 case TOMOYO_PATH1_PERM:
949 case TOMOYO_PATH2_PERM:
950 case TOMOYO_PATH1_PARENT_PERM:
951 case TOMOYO_PATH2_PARENT_PERM:
952 value = stat->mode & S_IALLUGO;
953 break;
954 }
955 }
956 break;
957 }
958 max_v[j] = value;
959 min_v[j] = value;
960 switch (index) {
961 case TOMOYO_MODE_SETUID:
962 case TOMOYO_MODE_SETGID:
963 case TOMOYO_MODE_STICKY:
964 case TOMOYO_MODE_OWNER_READ:
965 case TOMOYO_MODE_OWNER_WRITE:
966 case TOMOYO_MODE_OWNER_EXECUTE:
967 case TOMOYO_MODE_GROUP_READ:
968 case TOMOYO_MODE_GROUP_WRITE:
969 case TOMOYO_MODE_GROUP_EXECUTE:
970 case TOMOYO_MODE_OTHERS_READ:
971 case TOMOYO_MODE_OTHERS_WRITE:
972 case TOMOYO_MODE_OTHERS_EXECUTE:
973 is_bitop[j] = true;
974 }
975 }
976 if (left == TOMOYO_NUMBER_UNION) {
977 /* Fetch values now. */
978 const struct tomoyo_number_union *ptr = numbers_p++;
979 min_v[0] = ptr->values[0];
980 max_v[0] = ptr->values[1];
981 }
982 if (right == TOMOYO_NUMBER_UNION) {
983 /* Fetch values now. */
984 const struct tomoyo_number_union *ptr = numbers_p++;
985 if (ptr->group) {
986 if (tomoyo_number_matches_group(min_v[0],
987 max_v[0],
988 ptr->group)
989 == match)
990 continue;
991 } else {
992 if ((min_v[0] <= ptr->values[1] &&
993 max_v[0] >= ptr->values[0]) == match)
994 continue;
995 }
996 goto out;
997 }
998 /*
999 * Bit operation is valid only when counterpart value
1000 * represents permission.
1001 */
1002 if (is_bitop[0] && is_bitop[1]) {
1003 goto out;
1004 } else if (is_bitop[0]) {
1005 switch (right) {
1006 case TOMOYO_PATH1_PERM:
1007 case TOMOYO_PATH1_PARENT_PERM:
1008 case TOMOYO_PATH2_PERM:
1009 case TOMOYO_PATH2_PARENT_PERM:
1010 if (!(max_v[0] & max_v[1]) == !match)
1011 continue;
1012 }
1013 goto out;
1014 } else if (is_bitop[1]) {
1015 switch (left) {
1016 case TOMOYO_PATH1_PERM:
1017 case TOMOYO_PATH1_PARENT_PERM:
1018 case TOMOYO_PATH2_PERM:
1019 case TOMOYO_PATH2_PARENT_PERM:
1020 if (!(max_v[0] & max_v[1]) == !match)
1021 continue;
1022 }
1023 goto out;
1024 }
1025 /* Normal value range comparison. */
1026 if ((min_v[0] <= max_v[1] && max_v[0] >= min_v[1]) == match)
1027 continue;
1028 out:
1029 return false;
1030 }
1031 /* Check argv[] and envp[] now. */
1032 if (r->ee && (argc || envc))
1033 return tomoyo_scan_bprm(r->ee, argc, argv, envc, envp);
1034 return true;
1035 }