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x86: i8259A: remove redundant irq_descinitialization
[wrt350n-kernel.git] / security / selinux / ss / policydb.c
blobbd7d6a00342daa1a36ffcd244e0ac2eb02fdab79
1 /*
2 * Implementation of the policy database.
3 *
4 * Author : Stephen Smalley, <sds@epoch.ncsc.mil>
5 */
6
7 /*
8 * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
9 *
10 * Support for enhanced MLS infrastructure.
11 *
12 * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
13 *
14 * Added conditional policy language extensions
15 *
16 * Updated: Hewlett-Packard <paul.moore@hp.com>
17 *
18 * Added support for the policy capability bitmap
19 *
20 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
21 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
22 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
23 * This program is free software; you can redistribute it and/or modify
24 * it under the terms of the GNU General Public License as published by
25 * the Free Software Foundation, version 2.
26 */
27
28 #include <linux/kernel.h>
29 #include <linux/sched.h>
30 #include <linux/slab.h>
31 #include <linux/string.h>
32 #include <linux/errno.h>
33 #include "security.h"
34
35 #include "policydb.h"
36 #include "conditional.h"
37 #include "mls.h"
38
39 #define _DEBUG_HASHES
40
41 #ifdef DEBUG_HASHES
42 static char *symtab_name[SYM_NUM] = {
43 "common prefixes",
44 "classes",
45 "roles",
46 "types",
47 "users",
48 "bools",
49 "levels",
50 "categories",
51 };
52 #endif
53
54 int selinux_mls_enabled = 0;
55
56 static unsigned int symtab_sizes[SYM_NUM] = {
57 2,
58 32,
59 16,
60 512,
61 128,
62 16,
63 16,
64 16,
65 };
66
67 struct policydb_compat_info {
68 int version;
69 int sym_num;
70 int ocon_num;
71 };
72
73 /* These need to be updated if SYM_NUM or OCON_NUM changes */
74 static struct policydb_compat_info policydb_compat[] = {
75 {
76 .version = POLICYDB_VERSION_BASE,
77 .sym_num = SYM_NUM - 3,
78 .ocon_num = OCON_NUM - 1,
79 },
80 {
81 .version = POLICYDB_VERSION_BOOL,
82 .sym_num = SYM_NUM - 2,
83 .ocon_num = OCON_NUM - 1,
84 },
85 {
86 .version = POLICYDB_VERSION_IPV6,
87 .sym_num = SYM_NUM - 2,
88 .ocon_num = OCON_NUM,
89 },
90 {
91 .version = POLICYDB_VERSION_NLCLASS,
92 .sym_num = SYM_NUM - 2,
93 .ocon_num = OCON_NUM,
94 },
95 {
96 .version = POLICYDB_VERSION_MLS,
97 .sym_num = SYM_NUM,
98 .ocon_num = OCON_NUM,
99 },
100 {
101 .version = POLICYDB_VERSION_AVTAB,
102 .sym_num = SYM_NUM,
103 .ocon_num = OCON_NUM,
104 },
105 {
106 .version = POLICYDB_VERSION_RANGETRANS,
107 .sym_num = SYM_NUM,
108 .ocon_num = OCON_NUM,
109 },
110 {
111 .version = POLICYDB_VERSION_POLCAP,
112 .sym_num = SYM_NUM,
113 .ocon_num = OCON_NUM,
114 }
115 };
116
117 static struct policydb_compat_info *policydb_lookup_compat(int version)
118 {
119 int i;
120 struct policydb_compat_info *info = NULL;
121
122 for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) {
123 if (policydb_compat[i].version == version) {
124 info = &policydb_compat[i];
125 break;
126 }
127 }
128 return info;
129 }
130
131 /*
132 * Initialize the role table.
133 */
134 static int roles_init(struct policydb *p)
135 {
136 char *key = NULL;
137 int rc;
138 struct role_datum *role;
139
140 role = kzalloc(sizeof(*role), GFP_KERNEL);
141 if (!role) {
142 rc = -ENOMEM;
143 goto out;
144 }
145 role->value = ++p->p_roles.nprim;
146 if (role->value != OBJECT_R_VAL) {
147 rc = -EINVAL;
148 goto out_free_role;
149 }
150 key = kmalloc(strlen(OBJECT_R)+1,GFP_KERNEL);
151 if (!key) {
152 rc = -ENOMEM;
153 goto out_free_role;
154 }
155 strcpy(key, OBJECT_R);
156 rc = hashtab_insert(p->p_roles.table, key, role);
157 if (rc)
158 goto out_free_key;
159 out:
160 return rc;
161
162 out_free_key:
163 kfree(key);
164 out_free_role:
165 kfree(role);
166 goto out;
167 }
168
169 /*
170 * Initialize a policy database structure.
171 */
172 static int policydb_init(struct policydb *p)
173 {
174 int i, rc;
175
176 memset(p, 0, sizeof(*p));
177
178 for (i = 0; i < SYM_NUM; i++) {
179 rc = symtab_init(&p->symtab[i], symtab_sizes[i]);
180 if (rc)
181 goto out_free_symtab;
182 }
183
184 rc = avtab_init(&p->te_avtab);
185 if (rc)
186 goto out_free_symtab;
187
188 rc = roles_init(p);
189 if (rc)
190 goto out_free_symtab;
191
192 rc = cond_policydb_init(p);
193 if (rc)
194 goto out_free_symtab;
195
196 ebitmap_init(&p->policycaps);
197
198 out:
199 return rc;
200
201 out_free_symtab:
202 for (i = 0; i < SYM_NUM; i++)
203 hashtab_destroy(p->symtab[i].table);
204 goto out;
205 }
206
207 /*
208 * The following *_index functions are used to
209 * define the val_to_name and val_to_struct arrays
210 * in a policy database structure. The val_to_name
211 * arrays are used when converting security context
212 * structures into string representations. The
213 * val_to_struct arrays are used when the attributes
214 * of a class, role, or user are needed.
215 */
216
217 static int common_index(void *key, void *datum, void *datap)
218 {
219 struct policydb *p;
220 struct common_datum *comdatum;
221
222 comdatum = datum;
223 p = datap;
224 if (!comdatum->value || comdatum->value > p->p_commons.nprim)
225 return -EINVAL;
226 p->p_common_val_to_name[comdatum->value - 1] = key;
227 return 0;
228 }
229
230 static int class_index(void *key, void *datum, void *datap)
231 {
232 struct policydb *p;
233 struct class_datum *cladatum;
234
235 cladatum = datum;
236 p = datap;
237 if (!cladatum->value || cladatum->value > p->p_classes.nprim)
238 return -EINVAL;
239 p->p_class_val_to_name[cladatum->value - 1] = key;
240 p->class_val_to_struct[cladatum->value - 1] = cladatum;
241 return 0;
242 }
243
244 static int role_index(void *key, void *datum, void *datap)
245 {
246 struct policydb *p;
247 struct role_datum *role;
248
249 role = datum;
250 p = datap;
251 if (!role->value || role->value > p->p_roles.nprim)
252 return -EINVAL;
253 p->p_role_val_to_name[role->value - 1] = key;
254 p->role_val_to_struct[role->value - 1] = role;
255 return 0;
256 }
257
258 static int type_index(void *key, void *datum, void *datap)
259 {
260 struct policydb *p;
261 struct type_datum *typdatum;
262
263 typdatum = datum;
264 p = datap;
265
266 if (typdatum->primary) {
267 if (!typdatum->value || typdatum->value > p->p_types.nprim)
268 return -EINVAL;
269 p->p_type_val_to_name[typdatum->value - 1] = key;
270 }
271
272 return 0;
273 }
274
275 static int user_index(void *key, void *datum, void *datap)
276 {
277 struct policydb *p;
278 struct user_datum *usrdatum;
279
280 usrdatum = datum;
281 p = datap;
282 if (!usrdatum->value || usrdatum->value > p->p_users.nprim)
283 return -EINVAL;
284 p->p_user_val_to_name[usrdatum->value - 1] = key;
285 p->user_val_to_struct[usrdatum->value - 1] = usrdatum;
286 return 0;
287 }
288
289 static int sens_index(void *key, void *datum, void *datap)
290 {
291 struct policydb *p;
292 struct level_datum *levdatum;
293
294 levdatum = datum;
295 p = datap;
296
297 if (!levdatum->isalias) {
298 if (!levdatum->level->sens ||
299 levdatum->level->sens > p->p_levels.nprim)
300 return -EINVAL;
301 p->p_sens_val_to_name[levdatum->level->sens - 1] = key;
302 }
303
304 return 0;
305 }
306
307 static int cat_index(void *key, void *datum, void *datap)
308 {
309 struct policydb *p;
310 struct cat_datum *catdatum;
311
312 catdatum = datum;
313 p = datap;
314
315 if (!catdatum->isalias) {
316 if (!catdatum->value || catdatum->value > p->p_cats.nprim)
317 return -EINVAL;
318 p->p_cat_val_to_name[catdatum->value - 1] = key;
319 }
320
321 return 0;
322 }
323
324 static int (*index_f[SYM_NUM]) (void *key, void *datum, void *datap) =
325 {
326 common_index,
327 class_index,
328 role_index,
329 type_index,
330 user_index,
331 cond_index_bool,
332 sens_index,
333 cat_index,
334 };
335
336 /*
337 * Define the common val_to_name array and the class
338 * val_to_name and val_to_struct arrays in a policy
339 * database structure.
340 *
341 * Caller must clean up upon failure.
342 */
343 static int policydb_index_classes(struct policydb *p)
344 {
345 int rc;
346
347 p->p_common_val_to_name =
348 kmalloc(p->p_commons.nprim * sizeof(char *), GFP_KERNEL);
349 if (!p->p_common_val_to_name) {
350 rc = -ENOMEM;
351 goto out;
352 }
353
354 rc = hashtab_map(p->p_commons.table, common_index, p);
355 if (rc)
356 goto out;
357
358 p->class_val_to_struct =
359 kmalloc(p->p_classes.nprim * sizeof(*(p->class_val_to_struct)), GFP_KERNEL);
360 if (!p->class_val_to_struct) {
361 rc = -ENOMEM;
362 goto out;
363 }
364
365 p->p_class_val_to_name =
366 kmalloc(p->p_classes.nprim * sizeof(char *), GFP_KERNEL);
367 if (!p->p_class_val_to_name) {
368 rc = -ENOMEM;
369 goto out;
370 }
371
372 rc = hashtab_map(p->p_classes.table, class_index, p);
373 out:
374 return rc;
375 }
376
377 #ifdef DEBUG_HASHES
378 static void symtab_hash_eval(struct symtab *s)
379 {
380 int i;
381
382 for (i = 0; i < SYM_NUM; i++) {
383 struct hashtab *h = s[i].table;
384 struct hashtab_info info;
385
386 hashtab_stat(h, &info);
387 printk(KERN_DEBUG "%s: %d entries and %d/%d buckets used, "
388 "longest chain length %d\n", symtab_name[i], h->nel,
389 info.slots_used, h->size, info.max_chain_len);
390 }
391 }
392 #endif
393
394 /*
395 * Define the other val_to_name and val_to_struct arrays
396 * in a policy database structure.
397 *
398 * Caller must clean up on failure.
399 */
400 static int policydb_index_others(struct policydb *p)
401 {
402 int i, rc = 0;
403
404 printk(KERN_DEBUG "security: %d users, %d roles, %d types, %d bools",
405 p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim, p->p_bools.nprim);
406 if (selinux_mls_enabled)
407 printk(", %d sens, %d cats", p->p_levels.nprim,
408 p->p_cats.nprim);
409 printk("\n");
410
411 printk(KERN_DEBUG "security: %d classes, %d rules\n",
412 p->p_classes.nprim, p->te_avtab.nel);
413
414 #ifdef DEBUG_HASHES
415 avtab_hash_eval(&p->te_avtab, "rules");
416 symtab_hash_eval(p->symtab);
417 #endif
418
419 p->role_val_to_struct =
420 kmalloc(p->p_roles.nprim * sizeof(*(p->role_val_to_struct)),
421 GFP_KERNEL);
422 if (!p->role_val_to_struct) {
423 rc = -ENOMEM;
424 goto out;
425 }
426
427 p->user_val_to_struct =
428 kmalloc(p->p_users.nprim * sizeof(*(p->user_val_to_struct)),
429 GFP_KERNEL);
430 if (!p->user_val_to_struct) {
431 rc = -ENOMEM;
432 goto out;
433 }
434
435 if (cond_init_bool_indexes(p)) {
436 rc = -ENOMEM;
437 goto out;
438 }
439
440 for (i = SYM_ROLES; i < SYM_NUM; i++) {
441 p->sym_val_to_name[i] =
442 kmalloc(p->symtab[i].nprim * sizeof(char *), GFP_KERNEL);
443 if (!p->sym_val_to_name[i]) {
444 rc = -ENOMEM;
445 goto out;
446 }
447 rc = hashtab_map(p->symtab[i].table, index_f[i], p);
448 if (rc)
449 goto out;
450 }
451
452 out:
453 return rc;
454 }
455
456 /*
457 * The following *_destroy functions are used to
458 * free any memory allocated for each kind of
459 * symbol data in the policy database.
460 */
461
462 static int perm_destroy(void *key, void *datum, void *p)
463 {
464 kfree(key);
465 kfree(datum);
466 return 0;
467 }
468
469 static int common_destroy(void *key, void *datum, void *p)
470 {
471 struct common_datum *comdatum;
472
473 kfree(key);
474 comdatum = datum;
475 hashtab_map(comdatum->permissions.table, perm_destroy, NULL);
476 hashtab_destroy(comdatum->permissions.table);
477 kfree(datum);
478 return 0;
479 }
480
481 static int cls_destroy(void *key, void *datum, void *p)
482 {
483 struct class_datum *cladatum;
484 struct constraint_node *constraint, *ctemp;
485 struct constraint_expr *e, *etmp;
486
487 kfree(key);
488 cladatum = datum;
489 hashtab_map(cladatum->permissions.table, perm_destroy, NULL);
490 hashtab_destroy(cladatum->permissions.table);
491 constraint = cladatum->constraints;
492 while (constraint) {
493 e = constraint->expr;
494 while (e) {
495 ebitmap_destroy(&e->names);
496 etmp = e;
497 e = e->next;
498 kfree(etmp);
499 }
500 ctemp = constraint;
501 constraint = constraint->next;
502 kfree(ctemp);
503 }
504
505 constraint = cladatum->validatetrans;
506 while (constraint) {
507 e = constraint->expr;
508 while (e) {
509 ebitmap_destroy(&e->names);
510 etmp = e;
511 e = e->next;
512 kfree(etmp);
513 }
514 ctemp = constraint;
515 constraint = constraint->next;
516 kfree(ctemp);
517 }
518
519 kfree(cladatum->comkey);
520 kfree(datum);
521 return 0;
522 }
523
524 static int role_destroy(void *key, void *datum, void *p)
525 {
526 struct role_datum *role;
527
528 kfree(key);
529 role = datum;
530 ebitmap_destroy(&role->dominates);
531 ebitmap_destroy(&role->types);
532 kfree(datum);
533 return 0;
534 }
535
536 static int type_destroy(void *key, void *datum, void *p)
537 {
538 kfree(key);
539 kfree(datum);
540 return 0;
541 }
542
543 static int user_destroy(void *key, void *datum, void *p)
544 {
545 struct user_datum *usrdatum;
546
547 kfree(key);
548 usrdatum = datum;
549 ebitmap_destroy(&usrdatum->roles);
550 ebitmap_destroy(&usrdatum->range.level[0].cat);
551 ebitmap_destroy(&usrdatum->range.level[1].cat);
552 ebitmap_destroy(&usrdatum->dfltlevel.cat);
553 kfree(datum);
554 return 0;
555 }
556
557 static int sens_destroy(void *key, void *datum, void *p)
558 {
559 struct level_datum *levdatum;
560
561 kfree(key);
562 levdatum = datum;
563 ebitmap_destroy(&levdatum->level->cat);
564 kfree(levdatum->level);
565 kfree(datum);
566 return 0;
567 }
568
569 static int cat_destroy(void *key, void *datum, void *p)
570 {
571 kfree(key);
572 kfree(datum);
573 return 0;
574 }
575
576 static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) =
577 {
578 common_destroy,
579 cls_destroy,
580 role_destroy,
581 type_destroy,
582 user_destroy,
583 cond_destroy_bool,
584 sens_destroy,
585 cat_destroy,
586 };
587
588 static void ocontext_destroy(struct ocontext *c, int i)
589 {
590 context_destroy(&c->context[0]);
591 context_destroy(&c->context[1]);
592 if (i == OCON_ISID || i == OCON_FS ||
593 i == OCON_NETIF || i == OCON_FSUSE)
594 kfree(c->u.name);
595 kfree(c);
596 }
597
598 /*
599 * Free any memory allocated by a policy database structure.
600 */
601 void policydb_destroy(struct policydb *p)
602 {
603 struct ocontext *c, *ctmp;
604 struct genfs *g, *gtmp;
605 int i;
606 struct role_allow *ra, *lra = NULL;
607 struct role_trans *tr, *ltr = NULL;
608 struct range_trans *rt, *lrt = NULL;
609
610 for (i = 0; i < SYM_NUM; i++) {
611 cond_resched();
612 hashtab_map(p->symtab[i].table, destroy_f[i], NULL);
613 hashtab_destroy(p->symtab[i].table);
614 }
615
616 for (i = 0; i < SYM_NUM; i++)
617 kfree(p->sym_val_to_name[i]);
618
619 kfree(p->class_val_to_struct);
620 kfree(p->role_val_to_struct);
621 kfree(p->user_val_to_struct);
622
623 avtab_destroy(&p->te_avtab);
624
625 for (i = 0; i < OCON_NUM; i++) {
626 cond_resched();
627 c = p->ocontexts[i];
628 while (c) {
629 ctmp = c;
630 c = c->next;
631 ocontext_destroy(ctmp,i);
632 }
633 p->ocontexts[i] = NULL;
634 }
635
636 g = p->genfs;
637 while (g) {
638 cond_resched();
639 kfree(g->fstype);
640 c = g->head;
641 while (c) {
642 ctmp = c;
643 c = c->next;
644 ocontext_destroy(ctmp,OCON_FSUSE);
645 }
646 gtmp = g;
647 g = g->next;
648 kfree(gtmp);
649 }
650 p->genfs = NULL;
651
652 cond_policydb_destroy(p);
653
654 for (tr = p->role_tr; tr; tr = tr->next) {
655 cond_resched();
656 kfree(ltr);
657 ltr = tr;
658 }
659 kfree(ltr);
660
661 for (ra = p->role_allow; ra; ra = ra -> next) {
662 cond_resched();
663 kfree(lra);
664 lra = ra;
665 }
666 kfree(lra);
667
668 for (rt = p->range_tr; rt; rt = rt -> next) {
669 cond_resched();
670 if (lrt) {
671 ebitmap_destroy(&lrt->target_range.level[0].cat);
672 ebitmap_destroy(&lrt->target_range.level[1].cat);
673 kfree(lrt);
674 }
675 lrt = rt;
676 }
677 if (lrt) {
678 ebitmap_destroy(&lrt->target_range.level[0].cat);
679 ebitmap_destroy(&lrt->target_range.level[1].cat);
680 kfree(lrt);
681 }
682
683 if (p->type_attr_map) {
684 for (i = 0; i < p->p_types.nprim; i++)
685 ebitmap_destroy(&p->type_attr_map[i]);
686 }
687 kfree(p->type_attr_map);
688 kfree(p->undefined_perms);
689 ebitmap_destroy(&p->policycaps);
690
691 return;
692 }
693
694 /*
695 * Load the initial SIDs specified in a policy database
696 * structure into a SID table.
697 */
698 int policydb_load_isids(struct policydb *p, struct sidtab *s)
699 {
700 struct ocontext *head, *c;
701 int rc;
702
703 rc = sidtab_init(s);
704 if (rc) {
705 printk(KERN_ERR "security: out of memory on SID table init\n");
706 goto out;
707 }
708
709 head = p->ocontexts[OCON_ISID];
710 for (c = head; c; c = c->next) {
711 if (!c->context[0].user) {
712 printk(KERN_ERR "security: SID %s was never "
713 "defined.\n", c->u.name);
714 rc = -EINVAL;
715 goto out;
716 }
717 if (sidtab_insert(s, c->sid[0], &c->context[0])) {
718 printk(KERN_ERR "security: unable to load initial "
719 "SID %s.\n", c->u.name);
720 rc = -EINVAL;
721 goto out;
722 }
723 }
724 out:
725 return rc;
726 }
727
728 int policydb_class_isvalid(struct policydb *p, unsigned int class)
729 {
730 if (!class || class > p->p_classes.nprim)
731 return 0;
732 return 1;
733 }
734
735 int policydb_role_isvalid(struct policydb *p, unsigned int role)
736 {
737 if (!role || role > p->p_roles.nprim)
738 return 0;
739 return 1;
740 }
741
742 int policydb_type_isvalid(struct policydb *p, unsigned int type)
743 {
744 if (!type || type > p->p_types.nprim)
745 return 0;
746 return 1;
747 }
748
749 /*
750 * Return 1 if the fields in the security context
751 * structure `c' are valid. Return 0 otherwise.
752 */
753 int policydb_context_isvalid(struct policydb *p, struct context *c)
754 {
755 struct role_datum *role;
756 struct user_datum *usrdatum;
757
758 if (!c->role || c->role > p->p_roles.nprim)
759 return 0;
760
761 if (!c->user || c->user > p->p_users.nprim)
762 return 0;
763
764 if (!c->type || c->type > p->p_types.nprim)
765 return 0;
766
767 if (c->role != OBJECT_R_VAL) {
768 /*
769 * Role must be authorized for the type.
770 */
771 role = p->role_val_to_struct[c->role - 1];
772 if (!ebitmap_get_bit(&role->types,
773 c->type - 1))
774 /* role may not be associated with type */
775 return 0;
776
777 /*
778 * User must be authorized for the role.
779 */
780 usrdatum = p->user_val_to_struct[c->user - 1];
781 if (!usrdatum)
782 return 0;
783
784 if (!ebitmap_get_bit(&usrdatum->roles,
785 c->role - 1))
786 /* user may not be associated with role */
787 return 0;
788 }
789
790 if (!mls_context_isvalid(p, c))
791 return 0;
792
793 return 1;
794 }
795
796 /*
797 * Read a MLS range structure from a policydb binary
798 * representation file.
799 */
800 static int mls_read_range_helper(struct mls_range *r, void *fp)
801 {
802 __le32 buf[2];
803 u32 items;
804 int rc;
805
806 rc = next_entry(buf, fp, sizeof(u32));
807 if (rc < 0)
808 goto out;
809
810 items = le32_to_cpu(buf[0]);
811 if (items > ARRAY_SIZE(buf)) {
812 printk(KERN_ERR "security: mls: range overflow\n");
813 rc = -EINVAL;
814 goto out;
815 }
816 rc = next_entry(buf, fp, sizeof(u32) * items);
817 if (rc < 0) {
818 printk(KERN_ERR "security: mls: truncated range\n");
819 goto out;
820 }
821 r->level[0].sens = le32_to_cpu(buf[0]);
822 if (items > 1)
823 r->level[1].sens = le32_to_cpu(buf[1]);
824 else
825 r->level[1].sens = r->level[0].sens;
826
827 rc = ebitmap_read(&r->level[0].cat, fp);
828 if (rc) {
829 printk(KERN_ERR "security: mls: error reading low "
830 "categories\n");
831 goto out;
832 }
833 if (items > 1) {
834 rc = ebitmap_read(&r->level[1].cat, fp);
835 if (rc) {
836 printk(KERN_ERR "security: mls: error reading high "
837 "categories\n");
838 goto bad_high;
839 }
840 } else {
841 rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat);
842 if (rc) {
843 printk(KERN_ERR "security: mls: out of memory\n");
844 goto bad_high;
845 }
846 }
847
848 rc = 0;
849 out:
850 return rc;
851 bad_high:
852 ebitmap_destroy(&r->level[0].cat);
853 goto out;
854 }
855
856 /*
857 * Read and validate a security context structure
858 * from a policydb binary representation file.
859 */
860 static int context_read_and_validate(struct context *c,
861 struct policydb *p,
862 void *fp)
863 {
864 __le32 buf[3];
865 int rc;
866
867 rc = next_entry(buf, fp, sizeof buf);
868 if (rc < 0) {
869 printk(KERN_ERR "security: context truncated\n");
870 goto out;
871 }
872 c->user = le32_to_cpu(buf[0]);
873 c->role = le32_to_cpu(buf[1]);
874 c->type = le32_to_cpu(buf[2]);
875 if (p->policyvers >= POLICYDB_VERSION_MLS) {
876 if (mls_read_range_helper(&c->range, fp)) {
877 printk(KERN_ERR "security: error reading MLS range of "
878 "context\n");
879 rc = -EINVAL;
880 goto out;
881 }
882 }
883
884 if (!policydb_context_isvalid(p, c)) {
885 printk(KERN_ERR "security: invalid security context\n");
886 context_destroy(c);
887 rc = -EINVAL;
888 }
889 out:
890 return rc;
891 }
892
893 /*
894 * The following *_read functions are used to
895 * read the symbol data from a policy database
896 * binary representation file.
897 */
898
899 static int perm_read(struct policydb *p, struct hashtab *h, void *fp)
900 {
901 char *key = NULL;
902 struct perm_datum *perdatum;
903 int rc;
904 __le32 buf[2];
905 u32 len;
906
907 perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
908 if (!perdatum) {
909 rc = -ENOMEM;
910 goto out;
911 }
912
913 rc = next_entry(buf, fp, sizeof buf);
914 if (rc < 0)
915 goto bad;
916
917 len = le32_to_cpu(buf[0]);
918 perdatum->value = le32_to_cpu(buf[1]);
919
920 key = kmalloc(len + 1,GFP_KERNEL);
921 if (!key) {
922 rc = -ENOMEM;
923 goto bad;
924 }
925 rc = next_entry(key, fp, len);
926 if (rc < 0)
927 goto bad;
928 key[len] = 0;
929
930 rc = hashtab_insert(h, key, perdatum);
931 if (rc)
932 goto bad;
933 out:
934 return rc;
935 bad:
936 perm_destroy(key, perdatum, NULL);
937 goto out;
938 }
939
940 static int common_read(struct policydb *p, struct hashtab *h, void *fp)
941 {
942 char *key = NULL;
943 struct common_datum *comdatum;
944 __le32 buf[4];
945 u32 len, nel;
946 int i, rc;
947
948 comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
949 if (!comdatum) {
950 rc = -ENOMEM;
951 goto out;
952 }
953
954 rc = next_entry(buf, fp, sizeof buf);
955 if (rc < 0)
956 goto bad;
957
958 len = le32_to_cpu(buf[0]);
959 comdatum->value = le32_to_cpu(buf[1]);
960
961 rc = symtab_init(&comdatum->permissions, PERM_SYMTAB_SIZE);
962 if (rc)
963 goto bad;
964 comdatum->permissions.nprim = le32_to_cpu(buf[2]);
965 nel = le32_to_cpu(buf[3]);
966
967 key = kmalloc(len + 1,GFP_KERNEL);
968 if (!key) {
969 rc = -ENOMEM;
970 goto bad;
971 }
972 rc = next_entry(key, fp, len);
973 if (rc < 0)
974 goto bad;
975 key[len] = 0;
976
977 for (i = 0; i < nel; i++) {
978 rc = perm_read(p, comdatum->permissions.table, fp);
979 if (rc)
980 goto bad;
981 }
982
983 rc = hashtab_insert(h, key, comdatum);
984 if (rc)
985 goto bad;
986 out:
987 return rc;
988 bad:
989 common_destroy(key, comdatum, NULL);
990 goto out;
991 }
992
993 static int read_cons_helper(struct constraint_node **nodep, int ncons,
994 int allowxtarget, void *fp)
995 {
996 struct constraint_node *c, *lc;
997 struct constraint_expr *e, *le;
998 __le32 buf[3];
999 u32 nexpr;
1000 int rc, i, j, depth;
1001
1002 lc = NULL;
1003 for (i = 0; i < ncons; i++) {
1004 c = kzalloc(sizeof(*c), GFP_KERNEL);
1005 if (!c)
1006 return -ENOMEM;
1007
1008 if (lc) {
1009 lc->next = c;
1010 } else {
1011 *nodep = c;
1012 }
1013
1014 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1015 if (rc < 0)
1016 return rc;
1017 c->permissions = le32_to_cpu(buf[0]);
1018 nexpr = le32_to_cpu(buf[1]);
1019 le = NULL;
1020 depth = -1;
1021 for (j = 0; j < nexpr; j++) {
1022 e = kzalloc(sizeof(*e), GFP_KERNEL);
1023 if (!e)
1024 return -ENOMEM;
1025
1026 if (le) {
1027 le->next = e;
1028 } else {
1029 c->expr = e;
1030 }
1031
1032 rc = next_entry(buf, fp, (sizeof(u32) * 3));
1033 if (rc < 0)
1034 return rc;
1035 e->expr_type = le32_to_cpu(buf[0]);
1036 e->attr = le32_to_cpu(buf[1]);
1037 e->op = le32_to_cpu(buf[2]);
1038
1039 switch (e->expr_type) {
1040 case CEXPR_NOT:
1041 if (depth < 0)
1042 return -EINVAL;
1043 break;
1044 case CEXPR_AND:
1045 case CEXPR_OR:
1046 if (depth < 1)
1047 return -EINVAL;
1048 depth--;
1049 break;
1050 case CEXPR_ATTR:
1051 if (depth == (CEXPR_MAXDEPTH - 1))
1052 return -EINVAL;
1053 depth++;
1054 break;
1055 case CEXPR_NAMES:
1056 if (!allowxtarget && (e->attr & CEXPR_XTARGET))
1057 return -EINVAL;
1058 if (depth == (CEXPR_MAXDEPTH - 1))
1059 return -EINVAL;
1060 depth++;
1061 if (ebitmap_read(&e->names, fp))
1062 return -EINVAL;
1063 break;
1064 default:
1065 return -EINVAL;
1066 }
1067 le = e;
1068 }
1069 if (depth != 0)
1070 return -EINVAL;
1071 lc = c;
1072 }
1073
1074 return 0;
1075 }
1076
1077 static int class_read(struct policydb *p, struct hashtab *h, void *fp)
1078 {
1079 char *key = NULL;
1080 struct class_datum *cladatum;
1081 __le32 buf[6];
1082 u32 len, len2, ncons, nel;
1083 int i, rc;
1084
1085 cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
1086 if (!cladatum) {
1087 rc = -ENOMEM;
1088 goto out;
1089 }
1090
1091 rc = next_entry(buf, fp, sizeof(u32)*6);
1092 if (rc < 0)
1093 goto bad;
1094
1095 len = le32_to_cpu(buf[0]);
1096 len2 = le32_to_cpu(buf[1]);
1097 cladatum->value = le32_to_cpu(buf[2]);
1098
1099 rc = symtab_init(&cladatum->permissions, PERM_SYMTAB_SIZE);
1100 if (rc)
1101 goto bad;
1102 cladatum->permissions.nprim = le32_to_cpu(buf[3]);
1103 nel = le32_to_cpu(buf[4]);
1104
1105 ncons = le32_to_cpu(buf[5]);
1106
1107 key = kmalloc(len + 1,GFP_KERNEL);
1108 if (!key) {
1109 rc = -ENOMEM;
1110 goto bad;
1111 }
1112 rc = next_entry(key, fp, len);
1113 if (rc < 0)
1114 goto bad;
1115 key[len] = 0;
1116
1117 if (len2) {
1118 cladatum->comkey = kmalloc(len2 + 1,GFP_KERNEL);
1119 if (!cladatum->comkey) {
1120 rc = -ENOMEM;
1121 goto bad;
1122 }
1123 rc = next_entry(cladatum->comkey, fp, len2);
1124 if (rc < 0)
1125 goto bad;
1126 cladatum->comkey[len2] = 0;
1127
1128 cladatum->comdatum = hashtab_search(p->p_commons.table,
1129 cladatum->comkey);
1130 if (!cladatum->comdatum) {
1131 printk(KERN_ERR "security: unknown common %s\n",
1132 cladatum->comkey);
1133 rc = -EINVAL;
1134 goto bad;
1135 }
1136 }
1137 for (i = 0; i < nel; i++) {
1138 rc = perm_read(p, cladatum->permissions.table, fp);
1139 if (rc)
1140 goto bad;
1141 }
1142
1143 rc = read_cons_helper(&cladatum->constraints, ncons, 0, fp);
1144 if (rc)
1145 goto bad;
1146
1147 if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
1148 /* grab the validatetrans rules */
1149 rc = next_entry(buf, fp, sizeof(u32));
1150 if (rc < 0)
1151 goto bad;
1152 ncons = le32_to_cpu(buf[0]);
1153 rc = read_cons_helper(&cladatum->validatetrans, ncons, 1, fp);
1154 if (rc)
1155 goto bad;
1156 }
1157
1158 rc = hashtab_insert(h, key, cladatum);
1159 if (rc)
1160 goto bad;
1161
1162 rc = 0;
1163 out:
1164 return rc;
1165 bad:
1166 cls_destroy(key, cladatum, NULL);
1167 goto out;
1168 }
1169
1170 static int role_read(struct policydb *p, struct hashtab *h, void *fp)
1171 {
1172 char *key = NULL;
1173 struct role_datum *role;
1174 int rc;
1175 __le32 buf[2];
1176 u32 len;
1177
1178 role = kzalloc(sizeof(*role), GFP_KERNEL);
1179 if (!role) {
1180 rc = -ENOMEM;
1181 goto out;
1182 }
1183
1184 rc = next_entry(buf, fp, sizeof buf);
1185 if (rc < 0)
1186 goto bad;
1187
1188 len = le32_to_cpu(buf[0]);
1189 role->value = le32_to_cpu(buf[1]);
1190
1191 key = kmalloc(len + 1,GFP_KERNEL);
1192 if (!key) {
1193 rc = -ENOMEM;
1194 goto bad;
1195 }
1196 rc = next_entry(key, fp, len);
1197 if (rc < 0)
1198 goto bad;
1199 key[len] = 0;
1200
1201 rc = ebitmap_read(&role->dominates, fp);
1202 if (rc)
1203 goto bad;
1204
1205 rc = ebitmap_read(&role->types, fp);
1206 if (rc)
1207 goto bad;
1208
1209 if (strcmp(key, OBJECT_R) == 0) {
1210 if (role->value != OBJECT_R_VAL) {
1211 printk(KERN_ERR "Role %s has wrong value %d\n",
1212 OBJECT_R, role->value);
1213 rc = -EINVAL;
1214 goto bad;
1215 }
1216 rc = 0;
1217 goto bad;
1218 }
1219
1220 rc = hashtab_insert(h, key, role);
1221 if (rc)
1222 goto bad;
1223 out:
1224 return rc;
1225 bad:
1226 role_destroy(key, role, NULL);
1227 goto out;
1228 }
1229
1230 static int type_read(struct policydb *p, struct hashtab *h, void *fp)
1231 {
1232 char *key = NULL;
1233 struct type_datum *typdatum;
1234 int rc;
1235 __le32 buf[3];
1236 u32 len;
1237
1238 typdatum = kzalloc(sizeof(*typdatum),GFP_KERNEL);
1239 if (!typdatum) {
1240 rc = -ENOMEM;
1241 return rc;
1242 }
1243
1244 rc = next_entry(buf, fp, sizeof buf);
1245 if (rc < 0)
1246 goto bad;
1247
1248 len = le32_to_cpu(buf[0]);
1249 typdatum->value = le32_to_cpu(buf[1]);
1250 typdatum->primary = le32_to_cpu(buf[2]);
1251
1252 key = kmalloc(len + 1,GFP_KERNEL);
1253 if (!key) {
1254 rc = -ENOMEM;
1255 goto bad;
1256 }
1257 rc = next_entry(key, fp, len);
1258 if (rc < 0)
1259 goto bad;
1260 key[len] = 0;
1261
1262 rc = hashtab_insert(h, key, typdatum);
1263 if (rc)
1264 goto bad;
1265 out:
1266 return rc;
1267 bad:
1268 type_destroy(key, typdatum, NULL);
1269 goto out;
1270 }
1271
1272
1273 /*
1274 * Read a MLS level structure from a policydb binary
1275 * representation file.
1276 */
1277 static int mls_read_level(struct mls_level *lp, void *fp)
1278 {
1279 __le32 buf[1];
1280 int rc;
1281
1282 memset(lp, 0, sizeof(*lp));
1283
1284 rc = next_entry(buf, fp, sizeof buf);
1285 if (rc < 0) {
1286 printk(KERN_ERR "security: mls: truncated level\n");
1287 goto bad;
1288 }
1289 lp->sens = le32_to_cpu(buf[0]);
1290
1291 if (ebitmap_read(&lp->cat, fp)) {
1292 printk(KERN_ERR "security: mls: error reading level "
1293 "categories\n");
1294 goto bad;
1295 }
1296
1297 return 0;
1298
1299 bad:
1300 return -EINVAL;
1301 }
1302
1303 static int user_read(struct policydb *p, struct hashtab *h, void *fp)
1304 {
1305 char *key = NULL;
1306 struct user_datum *usrdatum;
1307 int rc;
1308 __le32 buf[2];
1309 u32 len;
1310
1311 usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
1312 if (!usrdatum) {
1313 rc = -ENOMEM;
1314 goto out;
1315 }
1316
1317 rc = next_entry(buf, fp, sizeof buf);
1318 if (rc < 0)
1319 goto bad;
1320
1321 len = le32_to_cpu(buf[0]);
1322 usrdatum->value = le32_to_cpu(buf[1]);
1323
1324 key = kmalloc(len + 1,GFP_KERNEL);
1325 if (!key) {
1326 rc = -ENOMEM;
1327 goto bad;
1328 }
1329 rc = next_entry(key, fp, len);
1330 if (rc < 0)
1331 goto bad;
1332 key[len] = 0;
1333
1334 rc = ebitmap_read(&usrdatum->roles, fp);
1335 if (rc)
1336 goto bad;
1337
1338 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1339 rc = mls_read_range_helper(&usrdatum->range, fp);
1340 if (rc)
1341 goto bad;
1342 rc = mls_read_level(&usrdatum->dfltlevel, fp);
1343 if (rc)
1344 goto bad;
1345 }
1346
1347 rc = hashtab_insert(h, key, usrdatum);
1348 if (rc)
1349 goto bad;
1350 out:
1351 return rc;
1352 bad:
1353 user_destroy(key, usrdatum, NULL);
1354 goto out;
1355 }
1356
1357 static int sens_read(struct policydb *p, struct hashtab *h, void *fp)
1358 {
1359 char *key = NULL;
1360 struct level_datum *levdatum;
1361 int rc;
1362 __le32 buf[2];
1363 u32 len;
1364
1365 levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC);
1366 if (!levdatum) {
1367 rc = -ENOMEM;
1368 goto out;
1369 }
1370
1371 rc = next_entry(buf, fp, sizeof buf);
1372 if (rc < 0)
1373 goto bad;
1374
1375 len = le32_to_cpu(buf[0]);
1376 levdatum->isalias = le32_to_cpu(buf[1]);
1377
1378 key = kmalloc(len + 1,GFP_ATOMIC);
1379 if (!key) {
1380 rc = -ENOMEM;
1381 goto bad;
1382 }
1383 rc = next_entry(key, fp, len);
1384 if (rc < 0)
1385 goto bad;
1386 key[len] = 0;
1387
1388 levdatum->level = kmalloc(sizeof(struct mls_level), GFP_ATOMIC);
1389 if (!levdatum->level) {
1390 rc = -ENOMEM;
1391 goto bad;
1392 }
1393 if (mls_read_level(levdatum->level, fp)) {
1394 rc = -EINVAL;
1395 goto bad;
1396 }
1397
1398 rc = hashtab_insert(h, key, levdatum);
1399 if (rc)
1400 goto bad;
1401 out:
1402 return rc;
1403 bad:
1404 sens_destroy(key, levdatum, NULL);
1405 goto out;
1406 }
1407
1408 static int cat_read(struct policydb *p, struct hashtab *h, void *fp)
1409 {
1410 char *key = NULL;
1411 struct cat_datum *catdatum;
1412 int rc;
1413 __le32 buf[3];
1414 u32 len;
1415
1416 catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC);
1417 if (!catdatum) {
1418 rc = -ENOMEM;
1419 goto out;
1420 }
1421
1422 rc = next_entry(buf, fp, sizeof buf);
1423 if (rc < 0)
1424 goto bad;
1425
1426 len = le32_to_cpu(buf[0]);
1427 catdatum->value = le32_to_cpu(buf[1]);
1428 catdatum->isalias = le32_to_cpu(buf[2]);
1429
1430 key = kmalloc(len + 1,GFP_ATOMIC);
1431 if (!key) {
1432 rc = -ENOMEM;
1433 goto bad;
1434 }
1435 rc = next_entry(key, fp, len);
1436 if (rc < 0)
1437 goto bad;
1438 key[len] = 0;
1439
1440 rc = hashtab_insert(h, key, catdatum);
1441 if (rc)
1442 goto bad;
1443 out:
1444 return rc;
1445
1446 bad:
1447 cat_destroy(key, catdatum, NULL);
1448 goto out;
1449 }
1450
1451 static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, void *fp) =
1452 {
1453 common_read,
1454 class_read,
1455 role_read,
1456 type_read,
1457 user_read,
1458 cond_read_bool,
1459 sens_read,
1460 cat_read,
1461 };
1462
1463 extern int ss_initialized;
1464
1465 /*
1466 * Read the configuration data from a policy database binary
1467 * representation file into a policy database structure.
1468 */
1469 int policydb_read(struct policydb *p, void *fp)
1470 {
1471 struct role_allow *ra, *lra;
1472 struct role_trans *tr, *ltr;
1473 struct ocontext *l, *c, *newc;
1474 struct genfs *genfs_p, *genfs, *newgenfs;
1475 int i, j, rc;
1476 __le32 buf[8];
1477 u32 len, len2, config, nprim, nel, nel2;
1478 char *policydb_str;
1479 struct policydb_compat_info *info;
1480 struct range_trans *rt, *lrt;
1481
1482 config = 0;
1483
1484 rc = policydb_init(p);
1485 if (rc)
1486 goto out;
1487
1488 /* Read the magic number and string length. */
1489 rc = next_entry(buf, fp, sizeof(u32)* 2);
1490 if (rc < 0)
1491 goto bad;
1492
1493 if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
1494 printk(KERN_ERR "security: policydb magic number 0x%x does "
1495 "not match expected magic number 0x%x\n",
1496 le32_to_cpu(buf[0]), POLICYDB_MAGIC);
1497 goto bad;
1498 }
1499
1500 len = le32_to_cpu(buf[1]);
1501 if (len != strlen(POLICYDB_STRING)) {
1502 printk(KERN_ERR "security: policydb string length %d does not "
1503 "match expected length %Zu\n",
1504 len, strlen(POLICYDB_STRING));
1505 goto bad;
1506 }
1507 policydb_str = kmalloc(len + 1,GFP_KERNEL);
1508 if (!policydb_str) {
1509 printk(KERN_ERR "security: unable to allocate memory for policydb "
1510 "string of length %d\n", len);
1511 rc = -ENOMEM;
1512 goto bad;
1513 }
1514 rc = next_entry(policydb_str, fp, len);
1515 if (rc < 0) {
1516 printk(KERN_ERR "security: truncated policydb string identifier\n");
1517 kfree(policydb_str);
1518 goto bad;
1519 }
1520 policydb_str[len] = 0;
1521 if (strcmp(policydb_str, POLICYDB_STRING)) {
1522 printk(KERN_ERR "security: policydb string %s does not match "
1523 "my string %s\n", policydb_str, POLICYDB_STRING);
1524 kfree(policydb_str);
1525 goto bad;
1526 }
1527 /* Done with policydb_str. */
1528 kfree(policydb_str);
1529 policydb_str = NULL;
1530
1531 /* Read the version, config, and table sizes. */
1532 rc = next_entry(buf, fp, sizeof(u32)*4);
1533 if (rc < 0)
1534 goto bad;
1535
1536 p->policyvers = le32_to_cpu(buf[0]);
1537 if (p->policyvers < POLICYDB_VERSION_MIN ||
1538 p->policyvers > POLICYDB_VERSION_MAX) {
1539 printk(KERN_ERR "security: policydb version %d does not match "
1540 "my version range %d-%d\n",
1541 le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
1542 goto bad;
1543 }
1544
1545 if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
1546 if (ss_initialized && !selinux_mls_enabled) {
1547 printk(KERN_ERR "Cannot switch between non-MLS and MLS "
1548 "policies\n");
1549 goto bad;
1550 }
1551 selinux_mls_enabled = 1;
1552 config |= POLICYDB_CONFIG_MLS;
1553
1554 if (p->policyvers < POLICYDB_VERSION_MLS) {
1555 printk(KERN_ERR "security policydb version %d (MLS) "
1556 "not backwards compatible\n", p->policyvers);
1557 goto bad;
1558 }
1559 } else {
1560 if (ss_initialized && selinux_mls_enabled) {
1561 printk(KERN_ERR "Cannot switch between MLS and non-MLS "
1562 "policies\n");
1563 goto bad;
1564 }
1565 }
1566 p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
1567 p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
1568
1569 if (p->policyvers >= POLICYDB_VERSION_POLCAP &&
1570 ebitmap_read(&p->policycaps, fp) != 0)
1571 goto bad;
1572
1573 info = policydb_lookup_compat(p->policyvers);
1574 if (!info) {
1575 printk(KERN_ERR "security: unable to find policy compat info "
1576 "for version %d\n", p->policyvers);
1577 goto bad;
1578 }
1579
1580 if (le32_to_cpu(buf[2]) != info->sym_num ||
1581 le32_to_cpu(buf[3]) != info->ocon_num) {
1582 printk(KERN_ERR "security: policydb table sizes (%d,%d) do "
1583 "not match mine (%d,%d)\n", le32_to_cpu(buf[2]),
1584 le32_to_cpu(buf[3]),
1585 info->sym_num, info->ocon_num);
1586 goto bad;
1587 }
1588
1589 for (i = 0; i < info->sym_num; i++) {
1590 rc = next_entry(buf, fp, sizeof(u32)*2);
1591 if (rc < 0)
1592 goto bad;
1593 nprim = le32_to_cpu(buf[0]);
1594 nel = le32_to_cpu(buf[1]);
1595 for (j = 0; j < nel; j++) {
1596 rc = read_f[i](p, p->symtab[i].table, fp);
1597 if (rc)
1598 goto bad;
1599 }
1600
1601 p->symtab[i].nprim = nprim;
1602 }
1603
1604 rc = avtab_read(&p->te_avtab, fp, p);
1605 if (rc)
1606 goto bad;
1607
1608 if (p->policyvers >= POLICYDB_VERSION_BOOL) {
1609 rc = cond_read_list(p, fp);
1610 if (rc)
1611 goto bad;
1612 }
1613
1614 rc = next_entry(buf, fp, sizeof(u32));
1615 if (rc < 0)
1616 goto bad;
1617 nel = le32_to_cpu(buf[0]);
1618 ltr = NULL;
1619 for (i = 0; i < nel; i++) {
1620 tr = kzalloc(sizeof(*tr), GFP_KERNEL);
1621 if (!tr) {
1622 rc = -ENOMEM;
1623 goto bad;
1624 }
1625 if (ltr) {
1626 ltr->next = tr;
1627 } else {
1628 p->role_tr = tr;
1629 }
1630 rc = next_entry(buf, fp, sizeof(u32)*3);
1631 if (rc < 0)
1632 goto bad;
1633 tr->role = le32_to_cpu(buf[0]);
1634 tr->type = le32_to_cpu(buf[1]);
1635 tr->new_role = le32_to_cpu(buf[2]);
1636 if (!policydb_role_isvalid(p, tr->role) ||
1637 !policydb_type_isvalid(p, tr->type) ||
1638 !policydb_role_isvalid(p, tr->new_role)) {
1639 rc = -EINVAL;
1640 goto bad;
1641 }
1642 ltr = tr;
1643 }
1644
1645 rc = next_entry(buf, fp, sizeof(u32));
1646 if (rc < 0)
1647 goto bad;
1648 nel = le32_to_cpu(buf[0]);
1649 lra = NULL;
1650 for (i = 0; i < nel; i++) {
1651 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
1652 if (!ra) {
1653 rc = -ENOMEM;
1654 goto bad;
1655 }
1656 if (lra) {
1657 lra->next = ra;
1658 } else {
1659 p->role_allow = ra;
1660 }
1661 rc = next_entry(buf, fp, sizeof(u32)*2);
1662 if (rc < 0)
1663 goto bad;
1664 ra->role = le32_to_cpu(buf[0]);
1665 ra->new_role = le32_to_cpu(buf[1]);
1666 if (!policydb_role_isvalid(p, ra->role) ||
1667 !policydb_role_isvalid(p, ra->new_role)) {
1668 rc = -EINVAL;
1669 goto bad;
1670 }
1671 lra = ra;
1672 }
1673
1674 rc = policydb_index_classes(p);
1675 if (rc)
1676 goto bad;
1677
1678 rc = policydb_index_others(p);
1679 if (rc)
1680 goto bad;
1681
1682 for (i = 0; i < info->ocon_num; i++) {
1683 rc = next_entry(buf, fp, sizeof(u32));
1684 if (rc < 0)
1685 goto bad;
1686 nel = le32_to_cpu(buf[0]);
1687 l = NULL;
1688 for (j = 0; j < nel; j++) {
1689 c = kzalloc(sizeof(*c), GFP_KERNEL);
1690 if (!c) {
1691 rc = -ENOMEM;
1692 goto bad;
1693 }
1694 if (l) {
1695 l->next = c;
1696 } else {
1697 p->ocontexts[i] = c;
1698 }
1699 l = c;
1700 rc = -EINVAL;
1701 switch (i) {
1702 case OCON_ISID:
1703 rc = next_entry(buf, fp, sizeof(u32));
1704 if (rc < 0)
1705 goto bad;
1706 c->sid[0] = le32_to_cpu(buf[0]);
1707 rc = context_read_and_validate(&c->context[0], p, fp);
1708 if (rc)
1709 goto bad;
1710 break;
1711 case OCON_FS:
1712 case OCON_NETIF:
1713 rc = next_entry(buf, fp, sizeof(u32));
1714 if (rc < 0)
1715 goto bad;
1716 len = le32_to_cpu(buf[0]);
1717 c->u.name = kmalloc(len + 1,GFP_KERNEL);
1718 if (!c->u.name) {
1719 rc = -ENOMEM;
1720 goto bad;
1721 }
1722 rc = next_entry(c->u.name, fp, len);
1723 if (rc < 0)
1724 goto bad;
1725 c->u.name[len] = 0;
1726 rc = context_read_and_validate(&c->context[0], p, fp);
1727 if (rc)
1728 goto bad;
1729 rc = context_read_and_validate(&c->context[1], p, fp);
1730 if (rc)
1731 goto bad;
1732 break;
1733 case OCON_PORT:
1734 rc = next_entry(buf, fp, sizeof(u32)*3);
1735 if (rc < 0)
1736 goto bad;
1737 c->u.port.protocol = le32_to_cpu(buf[0]);
1738 c->u.port.low_port = le32_to_cpu(buf[1]);
1739 c->u.port.high_port = le32_to_cpu(buf[2]);
1740 rc = context_read_and_validate(&c->context[0], p, fp);
1741 if (rc)
1742 goto bad;
1743 break;
1744 case OCON_NODE:
1745 rc = next_entry(buf, fp, sizeof(u32)* 2);
1746 if (rc < 0)
1747 goto bad;
1748 c->u.node.addr = le32_to_cpu(buf[0]);
1749 c->u.node.mask = le32_to_cpu(buf[1]);
1750 rc = context_read_and_validate(&c->context[0], p, fp);
1751 if (rc)
1752 goto bad;
1753 break;
1754 case OCON_FSUSE:
1755 rc = next_entry(buf, fp, sizeof(u32)*2);
1756 if (rc < 0)
1757 goto bad;
1758 c->v.behavior = le32_to_cpu(buf[0]);
1759 if (c->v.behavior > SECURITY_FS_USE_NONE)
1760 goto bad;
1761 len = le32_to_cpu(buf[1]);
1762 c->u.name = kmalloc(len + 1,GFP_KERNEL);
1763 if (!c->u.name) {
1764 rc = -ENOMEM;
1765 goto bad;
1766 }
1767 rc = next_entry(c->u.name, fp, len);
1768 if (rc < 0)
1769 goto bad;
1770 c->u.name[len] = 0;
1771 rc = context_read_and_validate(&c->context[0], p, fp);
1772 if (rc)
1773 goto bad;
1774 break;
1775 case OCON_NODE6: {
1776 int k;
1777
1778 rc = next_entry(buf, fp, sizeof(u32) * 8);
1779 if (rc < 0)
1780 goto bad;
1781 for (k = 0; k < 4; k++)
1782 c->u.node6.addr[k] = le32_to_cpu(buf[k]);
1783 for (k = 0; k < 4; k++)
1784 c->u.node6.mask[k] = le32_to_cpu(buf[k+4]);
1785 if (context_read_and_validate(&c->context[0], p, fp))
1786 goto bad;
1787 break;
1788 }
1789 }
1790 }
1791 }
1792
1793 rc = next_entry(buf, fp, sizeof(u32));
1794 if (rc < 0)
1795 goto bad;
1796 nel = le32_to_cpu(buf[0]);
1797 genfs_p = NULL;
1798 rc = -EINVAL;
1799 for (i = 0; i < nel; i++) {
1800 rc = next_entry(buf, fp, sizeof(u32));
1801 if (rc < 0)
1802 goto bad;
1803 len = le32_to_cpu(buf[0]);
1804 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
1805 if (!newgenfs) {
1806 rc = -ENOMEM;
1807 goto bad;
1808 }
1809
1810 newgenfs->fstype = kmalloc(len + 1,GFP_KERNEL);
1811 if (!newgenfs->fstype) {
1812 rc = -ENOMEM;
1813 kfree(newgenfs);
1814 goto bad;
1815 }
1816 rc = next_entry(newgenfs->fstype, fp, len);
1817 if (rc < 0) {
1818 kfree(newgenfs->fstype);
1819 kfree(newgenfs);
1820 goto bad;
1821 }
1822 newgenfs->fstype[len] = 0;
1823 for (genfs_p = NULL, genfs = p->genfs; genfs;
1824 genfs_p = genfs, genfs = genfs->next) {
1825 if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
1826 printk(KERN_ERR "security: dup genfs "
1827 "fstype %s\n", newgenfs->fstype);
1828 kfree(newgenfs->fstype);
1829 kfree(newgenfs);
1830 goto bad;
1831 }
1832 if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
1833 break;
1834 }
1835 newgenfs->next = genfs;
1836 if (genfs_p)
1837 genfs_p->next = newgenfs;
1838 else
1839 p->genfs = newgenfs;
1840 rc = next_entry(buf, fp, sizeof(u32));
1841 if (rc < 0)
1842 goto bad;
1843 nel2 = le32_to_cpu(buf[0]);
1844 for (j = 0; j < nel2; j++) {
1845 rc = next_entry(buf, fp, sizeof(u32));
1846 if (rc < 0)
1847 goto bad;
1848 len = le32_to_cpu(buf[0]);
1849
1850 newc = kzalloc(sizeof(*newc), GFP_KERNEL);
1851 if (!newc) {
1852 rc = -ENOMEM;
1853 goto bad;
1854 }
1855
1856 newc->u.name = kmalloc(len + 1,GFP_KERNEL);
1857 if (!newc->u.name) {
1858 rc = -ENOMEM;
1859 goto bad_newc;
1860 }
1861 rc = next_entry(newc->u.name, fp, len);
1862 if (rc < 0)
1863 goto bad_newc;
1864 newc->u.name[len] = 0;
1865 rc = next_entry(buf, fp, sizeof(u32));
1866 if (rc < 0)
1867 goto bad_newc;
1868 newc->v.sclass = le32_to_cpu(buf[0]);
1869 if (context_read_and_validate(&newc->context[0], p, fp))
1870 goto bad_newc;
1871 for (l = NULL, c = newgenfs->head; c;
1872 l = c, c = c->next) {
1873 if (!strcmp(newc->u.name, c->u.name) &&
1874 (!c->v.sclass || !newc->v.sclass ||
1875 newc->v.sclass == c->v.sclass)) {
1876 printk(KERN_ERR "security: dup genfs "
1877 "entry (%s,%s)\n",
1878 newgenfs->fstype, c->u.name);
1879 goto bad_newc;
1880 }
1881 len = strlen(newc->u.name);
1882 len2 = strlen(c->u.name);
1883 if (len > len2)
1884 break;
1885 }
1886
1887 newc->next = c;
1888 if (l)
1889 l->next = newc;
1890 else
1891 newgenfs->head = newc;
1892 }
1893 }
1894
1895 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1896 int new_rangetr = p->policyvers >= POLICYDB_VERSION_RANGETRANS;
1897 rc = next_entry(buf, fp, sizeof(u32));
1898 if (rc < 0)
1899 goto bad;
1900 nel = le32_to_cpu(buf[0]);
1901 lrt = NULL;
1902 for (i = 0; i < nel; i++) {
1903 rt = kzalloc(sizeof(*rt), GFP_KERNEL);
1904 if (!rt) {
1905 rc = -ENOMEM;
1906 goto bad;
1907 }
1908 if (lrt)
1909 lrt->next = rt;
1910 else
1911 p->range_tr = rt;
1912 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1913 if (rc < 0)
1914 goto bad;
1915 rt->source_type = le32_to_cpu(buf[0]);
1916 rt->target_type = le32_to_cpu(buf[1]);
1917 if (new_rangetr) {
1918 rc = next_entry(buf, fp, sizeof(u32));
1919 if (rc < 0)
1920 goto bad;
1921 rt->target_class = le32_to_cpu(buf[0]);
1922 } else
1923 rt->target_class = SECCLASS_PROCESS;
1924 if (!policydb_type_isvalid(p, rt->source_type) ||
1925 !policydb_type_isvalid(p, rt->target_type) ||
1926 !policydb_class_isvalid(p, rt->target_class)) {
1927 rc = -EINVAL;
1928 goto bad;
1929 }
1930 rc = mls_read_range_helper(&rt->target_range, fp);
1931 if (rc)
1932 goto bad;
1933 if (!mls_range_isvalid(p, &rt->target_range)) {
1934 printk(KERN_WARNING "security: rangetrans: invalid range\n");
1935 goto bad;
1936 }
1937 lrt = rt;
1938 }
1939 }
1940
1941 p->type_attr_map = kmalloc(p->p_types.nprim*sizeof(struct ebitmap), GFP_KERNEL);
1942 if (!p->type_attr_map)
1943 goto bad;
1944
1945 for (i = 0; i < p->p_types.nprim; i++) {
1946 ebitmap_init(&p->type_attr_map[i]);
1947 if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
1948 if (ebitmap_read(&p->type_attr_map[i], fp))
1949 goto bad;
1950 }
1951 /* add the type itself as the degenerate case */
1952 if (ebitmap_set_bit(&p->type_attr_map[i], i, 1))
1953 goto bad;
1954 }
1955
1956 rc = 0;
1957 out:
1958 return rc;
1959 bad_newc:
1960 ocontext_destroy(newc,OCON_FSUSE);
1961 bad:
1962 if (!rc)
1963 rc = -EINVAL;
1964 policydb_destroy(p);
1965 goto out;
1966 }
WRT350N Kernel Patches