TOMOYO: Allow controlling generation of access granted logs for per an entry basis.
[linux-3.10.git] / security / tomoyo / condition.c
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                 a->grant_log == b->grant_log &&
352                 !memcmp(a + 1, b + 1, a->size - sizeof(*a));
353 }
354
355 /**
356  * tomoyo_condition_type - Get condition type.
357  *
358  * @word: Keyword string.
359  *
360  * Returns one of values in "enum tomoyo_conditions_index" on success,
361  * TOMOYO_MAX_CONDITION_KEYWORD otherwise.
362  */
363 static u8 tomoyo_condition_type(const char *word)
364 {
365         u8 i;
366         for (i = 0; i < TOMOYO_MAX_CONDITION_KEYWORD; i++) {
367                 if (!strcmp(word, tomoyo_condition_keyword[i]))
368                         break;
369         }
370         return i;
371 }
372
373 /* Define this to enable debug mode. */
374 /* #define DEBUG_CONDITION */
375
376 #ifdef DEBUG_CONDITION
377 #define dprintk printk
378 #else
379 #define dprintk(...) do { } while (0)
380 #endif
381
382 /**
383  * tomoyo_commit_condition - Commit "struct tomoyo_condition".
384  *
385  * @entry: Pointer to "struct tomoyo_condition".
386  *
387  * Returns pointer to "struct tomoyo_condition" on success, NULL otherwise.
388  *
389  * This function merges duplicated entries. This function returns NULL if
390  * @entry is not duplicated but memory quota for policy has exceeded.
391  */
392 static struct tomoyo_condition *tomoyo_commit_condition
393 (struct tomoyo_condition *entry)
394 {
395         struct tomoyo_condition *ptr;
396         bool found = false;
397         if (mutex_lock_interruptible(&tomoyo_policy_lock)) {
398                 dprintk(KERN_WARNING "%u: %s failed\n", __LINE__, __func__);
399                 ptr = NULL;
400                 found = true;
401                 goto out;
402         }
403         list_for_each_entry_rcu(ptr, &tomoyo_condition_list, head.list) {
404                 if (!tomoyo_same_condition(ptr, entry))
405                         continue;
406                 /* Same entry found. Share this entry. */
407                 atomic_inc(&ptr->head.users);
408                 found = true;
409                 break;
410         }
411         if (!found) {
412                 if (tomoyo_memory_ok(entry)) {
413                         atomic_set(&entry->head.users, 1);
414                         list_add_rcu(&entry->head.list,
415                                      &tomoyo_condition_list);
416                 } else {
417                         found = true;
418                         ptr = NULL;
419                 }
420         }
421         mutex_unlock(&tomoyo_policy_lock);
422 out:
423         if (found) {
424                 tomoyo_del_condition(&entry->head.list);
425                 kfree(entry);
426                 entry = ptr;
427         }
428         return entry;
429 }
430
431 /**
432  * tomoyo_get_condition - Parse condition part.
433  *
434  * @param: Pointer to "struct tomoyo_acl_param".
435  *
436  * Returns pointer to "struct tomoyo_condition" on success, NULL otherwise.
437  */
438 struct tomoyo_condition *tomoyo_get_condition(struct tomoyo_acl_param *param)
439 {
440         struct tomoyo_condition *entry = NULL;
441         struct tomoyo_condition_element *condp = NULL;
442         struct tomoyo_number_union *numbers_p = NULL;
443         struct tomoyo_name_union *names_p = NULL;
444         struct tomoyo_argv *argv = NULL;
445         struct tomoyo_envp *envp = NULL;
446         struct tomoyo_condition e = { };
447         char * const start_of_string = param->data;
448         char * const end_of_string = start_of_string + strlen(start_of_string);
449         char *pos;
450 rerun:
451         pos = start_of_string;
452         while (1) {
453                 u8 left = -1;
454                 u8 right = -1;
455                 char *left_word = pos;
456                 char *cp;
457                 char *right_word;
458                 bool is_not;
459                 if (!*left_word)
460                         break;
461                 /*
462                  * Since left-hand condition does not allow use of "path_group"
463                  * or "number_group" and environment variable's names do not
464                  * accept '=', it is guaranteed that the original line consists
465                  * of one or more repetition of $left$operator$right blocks
466                  * where "$left is free from '=' and ' '" and "$operator is
467                  * either '=' or '!='" and "$right is free from ' '".
468                  * Therefore, we can reconstruct the original line at the end
469                  * of dry run even if we overwrite $operator with '\0'.
470                  */
471                 cp = strchr(pos, ' ');
472                 if (cp) {
473                         *cp = '\0'; /* Will restore later. */
474                         pos = cp + 1;
475                 } else {
476                         pos = "";
477                 }
478                 right_word = strchr(left_word, '=');
479                 if (!right_word || right_word == left_word)
480                         goto out;
481                 is_not = *(right_word - 1) == '!';
482                 if (is_not)
483                         *(right_word++ - 1) = '\0'; /* Will restore later. */
484                 else if (*(right_word + 1) != '=')
485                         *right_word++ = '\0'; /* Will restore later. */
486                 else
487                         goto out;
488                 dprintk(KERN_WARNING "%u: <%s>%s=<%s>\n", __LINE__, left_word,
489                         is_not ? "!" : "", right_word);
490                 if (!strcmp(left_word, "grant_log")) {
491                         if (entry) {
492                                 if (is_not ||
493                                     entry->grant_log != TOMOYO_GRANTLOG_AUTO)
494                                         goto out;
495                                 else if (!strcmp(right_word, "yes"))
496                                         entry->grant_log = TOMOYO_GRANTLOG_YES;
497                                 else if (!strcmp(right_word, "no"))
498                                         entry->grant_log = TOMOYO_GRANTLOG_NO;
499                                 else
500                                         goto out;
501                         }
502                         continue;
503                 }
504                 if (!strncmp(left_word, "exec.argv[", 10)) {
505                         if (!argv) {
506                                 e.argc++;
507                                 e.condc++;
508                         } else {
509                                 e.argc--;
510                                 e.condc--;
511                                 left = TOMOYO_ARGV_ENTRY;
512                                 argv->is_not = is_not;
513                                 if (!tomoyo_parse_argv(left_word + 10,
514                                                        right_word, argv++))
515                                         goto out;
516                         }
517                         goto store_value;
518                 }
519                 if (!strncmp(left_word, "exec.envp[\"", 11)) {
520                         if (!envp) {
521                                 e.envc++;
522                                 e.condc++;
523                         } else {
524                                 e.envc--;
525                                 e.condc--;
526                                 left = TOMOYO_ENVP_ENTRY;
527                                 envp->is_not = is_not;
528                                 if (!tomoyo_parse_envp(left_word + 11,
529                                                        right_word, envp++))
530                                         goto out;
531                         }
532                         goto store_value;
533                 }
534                 left = tomoyo_condition_type(left_word);
535                 dprintk(KERN_WARNING "%u: <%s> left=%u\n", __LINE__, left_word,
536                         left);
537                 if (left == TOMOYO_MAX_CONDITION_KEYWORD) {
538                         if (!numbers_p) {
539                                 e.numbers_count++;
540                         } else {
541                                 e.numbers_count--;
542                                 left = TOMOYO_NUMBER_UNION;
543                                 param->data = left_word;
544                                 if (*left_word == '@' ||
545                                     !tomoyo_parse_number_union(param,
546                                                                numbers_p++))
547                                         goto out;
548                         }
549                 }
550                 if (!condp)
551                         e.condc++;
552                 else
553                         e.condc--;
554                 if (left == TOMOYO_EXEC_REALPATH ||
555                     left == TOMOYO_SYMLINK_TARGET) {
556                         if (!names_p) {
557                                 e.names_count++;
558                         } else {
559                                 e.names_count--;
560                                 right = TOMOYO_NAME_UNION;
561                                 param->data = right_word;
562                                 if (!tomoyo_parse_name_union_quoted(param,
563                                                                     names_p++))
564                                         goto out;
565                         }
566                         goto store_value;
567                 }
568                 right = tomoyo_condition_type(right_word);
569                 if (right == TOMOYO_MAX_CONDITION_KEYWORD) {
570                         if (!numbers_p) {
571                                 e.numbers_count++;
572                         } else {
573                                 e.numbers_count--;
574                                 right = TOMOYO_NUMBER_UNION;
575                                 param->data = right_word;
576                                 if (!tomoyo_parse_number_union(param,
577                                                                numbers_p++))
578                                         goto out;
579                         }
580                 }
581 store_value:
582                 if (!condp) {
583                         dprintk(KERN_WARNING "%u: dry_run left=%u right=%u "
584                                 "match=%u\n", __LINE__, left, right, !is_not);
585                         continue;
586                 }
587                 condp->left = left;
588                 condp->right = right;
589                 condp->equals = !is_not;
590                 dprintk(KERN_WARNING "%u: left=%u right=%u match=%u\n",
591                         __LINE__, condp->left, condp->right,
592                         condp->equals);
593                 condp++;
594         }
595         dprintk(KERN_INFO "%u: cond=%u numbers=%u names=%u ac=%u ec=%u\n",
596                 __LINE__, e.condc, e.numbers_count, e.names_count, e.argc,
597                 e.envc);
598         if (entry) {
599                 BUG_ON(e.names_count | e.numbers_count | e.argc | e.envc |
600                        e.condc);
601                 return tomoyo_commit_condition(entry);
602         }
603         e.size = sizeof(*entry)
604                 + e.condc * sizeof(struct tomoyo_condition_element)
605                 + e.numbers_count * sizeof(struct tomoyo_number_union)
606                 + e.names_count * sizeof(struct tomoyo_name_union)
607                 + e.argc * sizeof(struct tomoyo_argv)
608                 + e.envc * sizeof(struct tomoyo_envp);
609         entry = kzalloc(e.size, GFP_NOFS);
610         if (!entry)
611                 return NULL;
612         *entry = e;
613         condp = (struct tomoyo_condition_element *) (entry + 1);
614         numbers_p = (struct tomoyo_number_union *) (condp + e.condc);
615         names_p = (struct tomoyo_name_union *) (numbers_p + e.numbers_count);
616         argv = (struct tomoyo_argv *) (names_p + e.names_count);
617         envp = (struct tomoyo_envp *) (argv + e.argc);
618         {
619                 bool flag = false;
620                 for (pos = start_of_string; pos < end_of_string; pos++) {
621                         if (*pos)
622                                 continue;
623                         if (flag) /* Restore " ". */
624                                 *pos = ' ';
625                         else if (*(pos + 1) == '=') /* Restore "!=". */
626                                 *pos = '!';
627                         else /* Restore "=". */
628                                 *pos = '=';
629                         flag = !flag;
630                 }
631         }
632         goto rerun;
633 out:
634         dprintk(KERN_WARNING "%u: %s failed\n", __LINE__, __func__);
635         if (entry) {
636                 tomoyo_del_condition(&entry->head.list);
637                 kfree(entry);
638         }
639         return NULL;
640 }
641
642 /**
643  * tomoyo_get_attributes - Revalidate "struct inode".
644  *
645  * @obj: Pointer to "struct tomoyo_obj_info".
646  *
647  * Returns nothing.
648  */
649 void tomoyo_get_attributes(struct tomoyo_obj_info *obj)
650 {
651         u8 i;
652         struct dentry *dentry = NULL;
653
654         for (i = 0; i < TOMOYO_MAX_PATH_STAT; i++) {
655                 struct inode *inode;
656                 switch (i) {
657                 case TOMOYO_PATH1:
658                         dentry = obj->path1.dentry;
659                         if (!dentry)
660                                 continue;
661                         break;
662                 case TOMOYO_PATH2:
663                         dentry = obj->path2.dentry;
664                         if (!dentry)
665                                 continue;
666                         break;
667                 default:
668                         if (!dentry)
669                                 continue;
670                         dentry = dget_parent(dentry);
671                         break;
672                 }
673                 inode = dentry->d_inode;
674                 if (inode) {
675                         struct tomoyo_mini_stat *stat = &obj->stat[i];
676                         stat->uid  = inode->i_uid;
677                         stat->gid  = inode->i_gid;
678                         stat->ino  = inode->i_ino;
679                         stat->mode = inode->i_mode;
680                         stat->dev  = inode->i_sb->s_dev;
681                         stat->rdev = inode->i_rdev;
682                         obj->stat_valid[i] = true;
683                 }
684                 if (i & 1) /* i == TOMOYO_PATH1_PARENT ||
685                               i == TOMOYO_PATH2_PARENT */
686                         dput(dentry);
687         }
688 }
689
690 /**
691  * tomoyo_condition - Check condition part.
692  *
693  * @r:    Pointer to "struct tomoyo_request_info".
694  * @cond: Pointer to "struct tomoyo_condition". Maybe NULL.
695  *
696  * Returns true on success, false otherwise.
697  *
698  * Caller holds tomoyo_read_lock().
699  */
700 bool tomoyo_condition(struct tomoyo_request_info *r,
701                       const struct tomoyo_condition *cond)
702 {
703         u32 i;
704         unsigned long min_v[2] = { 0, 0 };
705         unsigned long max_v[2] = { 0, 0 };
706         const struct tomoyo_condition_element *condp;
707         const struct tomoyo_number_union *numbers_p;
708         const struct tomoyo_name_union *names_p;
709         const struct tomoyo_argv *argv;
710         const struct tomoyo_envp *envp;
711         struct tomoyo_obj_info *obj;
712         u16 condc;
713         u16 argc;
714         u16 envc;
715         struct linux_binprm *bprm = NULL;
716         if (!cond)
717                 return true;
718         condc = cond->condc;
719         argc = cond->argc;
720         envc = cond->envc;
721         obj = r->obj;
722         if (r->ee)
723                 bprm = r->ee->bprm;
724         if (!bprm && (argc || envc))
725                 return false;
726         condp = (struct tomoyo_condition_element *) (cond + 1);
727         numbers_p = (const struct tomoyo_number_union *) (condp + condc);
728         names_p = (const struct tomoyo_name_union *)
729                 (numbers_p + cond->numbers_count);
730         argv = (const struct tomoyo_argv *) (names_p + cond->names_count);
731         envp = (const struct tomoyo_envp *) (argv + argc);
732         for (i = 0; i < condc; i++) {
733                 const bool match = condp->equals;
734                 const u8 left = condp->left;
735                 const u8 right = condp->right;
736                 bool is_bitop[2] = { false, false };
737                 u8 j;
738                 condp++;
739                 /* Check argv[] and envp[] later. */
740                 if (left == TOMOYO_ARGV_ENTRY || left == TOMOYO_ENVP_ENTRY)
741                         continue;
742                 /* Check string expressions. */
743                 if (right == TOMOYO_NAME_UNION) {
744                         const struct tomoyo_name_union *ptr = names_p++;
745                         switch (left) {
746                                 struct tomoyo_path_info *symlink;
747                                 struct tomoyo_execve *ee;
748                                 struct file *file;
749                         case TOMOYO_SYMLINK_TARGET:
750                                 symlink = obj ? obj->symlink_target : NULL;
751                                 if (!symlink ||
752                                     !tomoyo_compare_name_union(symlink, ptr)
753                                     == match)
754                                         goto out;
755                                 break;
756                         case TOMOYO_EXEC_REALPATH:
757                                 ee = r->ee;
758                                 file = ee ? ee->bprm->file : NULL;
759                                 if (!tomoyo_scan_exec_realpath(file, ptr,
760                                                                match))
761                                         goto out;
762                                 break;
763                         }
764                         continue;
765                 }
766                 /* Check numeric or bit-op expressions. */
767                 for (j = 0; j < 2; j++) {
768                         const u8 index = j ? right : left;
769                         unsigned long value = 0;
770                         switch (index) {
771                         case TOMOYO_TASK_UID:
772                                 value = current_uid();
773                                 break;
774                         case TOMOYO_TASK_EUID:
775                                 value = current_euid();
776                                 break;
777                         case TOMOYO_TASK_SUID:
778                                 value = current_suid();
779                                 break;
780                         case TOMOYO_TASK_FSUID:
781                                 value = current_fsuid();
782                                 break;
783                         case TOMOYO_TASK_GID:
784                                 value = current_gid();
785                                 break;
786                         case TOMOYO_TASK_EGID:
787                                 value = current_egid();
788                                 break;
789                         case TOMOYO_TASK_SGID:
790                                 value = current_sgid();
791                                 break;
792                         case TOMOYO_TASK_FSGID:
793                                 value = current_fsgid();
794                                 break;
795                         case TOMOYO_TASK_PID:
796                                 value = tomoyo_sys_getpid();
797                                 break;
798                         case TOMOYO_TASK_PPID:
799                                 value = tomoyo_sys_getppid();
800                                 break;
801                         case TOMOYO_TYPE_IS_SOCKET:
802                                 value = S_IFSOCK;
803                                 break;
804                         case TOMOYO_TYPE_IS_SYMLINK:
805                                 value = S_IFLNK;
806                                 break;
807                         case TOMOYO_TYPE_IS_FILE:
808                                 value = S_IFREG;
809                                 break;
810                         case TOMOYO_TYPE_IS_BLOCK_DEV:
811                                 value = S_IFBLK;
812                                 break;
813                         case TOMOYO_TYPE_IS_DIRECTORY:
814                                 value = S_IFDIR;
815                                 break;
816                         case TOMOYO_TYPE_IS_CHAR_DEV:
817                                 value = S_IFCHR;
818                                 break;
819                         case TOMOYO_TYPE_IS_FIFO:
820                                 value = S_IFIFO;
821                                 break;
822                         case TOMOYO_MODE_SETUID:
823                                 value = S_ISUID;
824                                 break;
825                         case TOMOYO_MODE_SETGID:
826                                 value = S_ISGID;
827                                 break;
828                         case TOMOYO_MODE_STICKY:
829                                 value = S_ISVTX;
830                                 break;
831                         case TOMOYO_MODE_OWNER_READ:
832                                 value = S_IRUSR;
833                                 break;
834                         case TOMOYO_MODE_OWNER_WRITE:
835                                 value = S_IWUSR;
836                                 break;
837                         case TOMOYO_MODE_OWNER_EXECUTE:
838                                 value = S_IXUSR;
839                                 break;
840                         case TOMOYO_MODE_GROUP_READ:
841                                 value = S_IRGRP;
842                                 break;
843                         case TOMOYO_MODE_GROUP_WRITE:
844                                 value = S_IWGRP;
845                                 break;
846                         case TOMOYO_MODE_GROUP_EXECUTE:
847                                 value = S_IXGRP;
848                                 break;
849                         case TOMOYO_MODE_OTHERS_READ:
850                                 value = S_IROTH;
851                                 break;
852                         case TOMOYO_MODE_OTHERS_WRITE:
853                                 value = S_IWOTH;
854                                 break;
855                         case TOMOYO_MODE_OTHERS_EXECUTE:
856                                 value = S_IXOTH;
857                                 break;
858                         case TOMOYO_EXEC_ARGC:
859                                 if (!bprm)
860                                         goto out;
861                                 value = bprm->argc;
862                                 break;
863                         case TOMOYO_EXEC_ENVC:
864                                 if (!bprm)
865                                         goto out;
866                                 value = bprm->envc;
867                                 break;
868                         case TOMOYO_NUMBER_UNION:
869                                 /* Fetch values later. */
870                                 break;
871                         default:
872                                 if (!obj)
873                                         goto out;
874                                 if (!obj->validate_done) {
875                                         tomoyo_get_attributes(obj);
876                                         obj->validate_done = true;
877                                 }
878                                 {
879                                         u8 stat_index;
880                                         struct tomoyo_mini_stat *stat;
881                                         switch (index) {
882                                         case TOMOYO_PATH1_UID:
883                                         case TOMOYO_PATH1_GID:
884                                         case TOMOYO_PATH1_INO:
885                                         case TOMOYO_PATH1_MAJOR:
886                                         case TOMOYO_PATH1_MINOR:
887                                         case TOMOYO_PATH1_TYPE:
888                                         case TOMOYO_PATH1_DEV_MAJOR:
889                                         case TOMOYO_PATH1_DEV_MINOR:
890                                         case TOMOYO_PATH1_PERM:
891                                                 stat_index = TOMOYO_PATH1;
892                                                 break;
893                                         case TOMOYO_PATH2_UID:
894                                         case TOMOYO_PATH2_GID:
895                                         case TOMOYO_PATH2_INO:
896                                         case TOMOYO_PATH2_MAJOR:
897                                         case TOMOYO_PATH2_MINOR:
898                                         case TOMOYO_PATH2_TYPE:
899                                         case TOMOYO_PATH2_DEV_MAJOR:
900                                         case TOMOYO_PATH2_DEV_MINOR:
901                                         case TOMOYO_PATH2_PERM:
902                                                 stat_index = TOMOYO_PATH2;
903                                                 break;
904                                         case TOMOYO_PATH1_PARENT_UID:
905                                         case TOMOYO_PATH1_PARENT_GID:
906                                         case TOMOYO_PATH1_PARENT_INO:
907                                         case TOMOYO_PATH1_PARENT_PERM:
908                                                 stat_index =
909                                                         TOMOYO_PATH1_PARENT;
910                                                 break;
911                                         case TOMOYO_PATH2_PARENT_UID:
912                                         case TOMOYO_PATH2_PARENT_GID:
913                                         case TOMOYO_PATH2_PARENT_INO:
914                                         case TOMOYO_PATH2_PARENT_PERM:
915                                                 stat_index =
916                                                         TOMOYO_PATH2_PARENT;
917                                                 break;
918                                         default:
919                                                 goto out;
920                                         }
921                                         if (!obj->stat_valid[stat_index])
922                                                 goto out;
923                                         stat = &obj->stat[stat_index];
924                                         switch (index) {
925                                         case TOMOYO_PATH1_UID:
926                                         case TOMOYO_PATH2_UID:
927                                         case TOMOYO_PATH1_PARENT_UID:
928                                         case TOMOYO_PATH2_PARENT_UID:
929                                                 value = stat->uid;
930                                                 break;
931                                         case TOMOYO_PATH1_GID:
932                                         case TOMOYO_PATH2_GID:
933                                         case TOMOYO_PATH1_PARENT_GID:
934                                         case TOMOYO_PATH2_PARENT_GID:
935                                                 value = stat->gid;
936                                                 break;
937                                         case TOMOYO_PATH1_INO:
938                                         case TOMOYO_PATH2_INO:
939                                         case TOMOYO_PATH1_PARENT_INO:
940                                         case TOMOYO_PATH2_PARENT_INO:
941                                                 value = stat->ino;
942                                                 break;
943                                         case TOMOYO_PATH1_MAJOR:
944                                         case TOMOYO_PATH2_MAJOR:
945                                                 value = MAJOR(stat->dev);
946                                                 break;
947                                         case TOMOYO_PATH1_MINOR:
948                                         case TOMOYO_PATH2_MINOR:
949                                                 value = MINOR(stat->dev);
950                                                 break;
951                                         case TOMOYO_PATH1_TYPE:
952                                         case TOMOYO_PATH2_TYPE:
953                                                 value = stat->mode & S_IFMT;
954                                                 break;
955                                         case TOMOYO_PATH1_DEV_MAJOR:
956                                         case TOMOYO_PATH2_DEV_MAJOR:
957                                                 value = MAJOR(stat->rdev);
958                                                 break;
959                                         case TOMOYO_PATH1_DEV_MINOR:
960                                         case TOMOYO_PATH2_DEV_MINOR:
961                                                 value = MINOR(stat->rdev);
962                                                 break;
963                                         case TOMOYO_PATH1_PERM:
964                                         case TOMOYO_PATH2_PERM:
965                                         case TOMOYO_PATH1_PARENT_PERM:
966                                         case TOMOYO_PATH2_PARENT_PERM:
967                                                 value = stat->mode & S_IALLUGO;
968                                                 break;
969                                         }
970                                 }
971                                 break;
972                         }
973                         max_v[j] = value;
974                         min_v[j] = value;
975                         switch (index) {
976                         case TOMOYO_MODE_SETUID:
977                         case TOMOYO_MODE_SETGID:
978                         case TOMOYO_MODE_STICKY:
979                         case TOMOYO_MODE_OWNER_READ:
980                         case TOMOYO_MODE_OWNER_WRITE:
981                         case TOMOYO_MODE_OWNER_EXECUTE:
982                         case TOMOYO_MODE_GROUP_READ:
983                         case TOMOYO_MODE_GROUP_WRITE:
984                         case TOMOYO_MODE_GROUP_EXECUTE:
985                         case TOMOYO_MODE_OTHERS_READ:
986                         case TOMOYO_MODE_OTHERS_WRITE:
987                         case TOMOYO_MODE_OTHERS_EXECUTE:
988                                 is_bitop[j] = true;
989                         }
990                 }
991                 if (left == TOMOYO_NUMBER_UNION) {
992                         /* Fetch values now. */
993                         const struct tomoyo_number_union *ptr = numbers_p++;
994                         min_v[0] = ptr->values[0];
995                         max_v[0] = ptr->values[1];
996                 }
997                 if (right == TOMOYO_NUMBER_UNION) {
998                         /* Fetch values now. */
999                         const struct tomoyo_number_union *ptr = numbers_p++;
1000                         if (ptr->group) {
1001                                 if (tomoyo_number_matches_group(min_v[0],
1002                                                                 max_v[0],
1003                                                                 ptr->group)
1004                                     == match)
1005                                         continue;
1006                         } else {
1007                                 if ((min_v[0] <= ptr->values[1] &&
1008                                      max_v[0] >= ptr->values[0]) == match)
1009                                         continue;
1010                         }
1011                         goto out;
1012                 }
1013                 /*
1014                  * Bit operation is valid only when counterpart value
1015                  * represents permission.
1016                  */
1017                 if (is_bitop[0] && is_bitop[1]) {
1018                         goto out;
1019                 } else if (is_bitop[0]) {
1020                         switch (right) {
1021                         case TOMOYO_PATH1_PERM:
1022                         case TOMOYO_PATH1_PARENT_PERM:
1023                         case TOMOYO_PATH2_PERM:
1024                         case TOMOYO_PATH2_PARENT_PERM:
1025                                 if (!(max_v[0] & max_v[1]) == !match)
1026                                         continue;
1027                         }
1028                         goto out;
1029                 } else if (is_bitop[1]) {
1030                         switch (left) {
1031                         case TOMOYO_PATH1_PERM:
1032                         case TOMOYO_PATH1_PARENT_PERM:
1033                         case TOMOYO_PATH2_PERM:
1034                         case TOMOYO_PATH2_PARENT_PERM:
1035                                 if (!(max_v[0] & max_v[1]) == !match)
1036                                         continue;
1037                         }
1038                         goto out;
1039                 }
1040                 /* Normal value range comparison. */
1041                 if ((min_v[0] <= max_v[1] && max_v[0] >= min_v[1]) == match)
1042                         continue;
1043 out:
1044                 return false;
1045         }
1046         /* Check argv[] and envp[] now. */
1047         if (r->ee && (argc || envc))
1048                 return tomoyo_scan_bprm(r->ee, argc, argv, envc, envp);
1049         return true;
1050 }