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[Bluetooth] Switch from OGF+OCF to using only opcodes
[linux-2.6/verdex.git] / security / selinux / ss / policydb.c
blob539828b229b2e27f39ba6b9904f37308b38d6baa
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 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
17 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
18 * This program is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License as published by
20 * the Free Software Foundation, version 2.
21 */
22
23 #include <linux/kernel.h>
24 #include <linux/sched.h>
25 #include <linux/slab.h>
26 #include <linux/string.h>
27 #include <linux/errno.h>
28 #include "security.h"
29
30 #include "policydb.h"
31 #include "conditional.h"
32 #include "mls.h"
33
34 #define _DEBUG_HASHES
35
36 #ifdef DEBUG_HASHES
37 static char *symtab_name[SYM_NUM] = {
38 "common prefixes",
39 "classes",
40 "roles",
41 "types",
42 "users",
43 "bools",
44 "levels",
45 "categories",
46 };
47 #endif
48
49 int selinux_mls_enabled = 0;
50
51 static unsigned int symtab_sizes[SYM_NUM] = {
52 2,
53 32,
54 16,
55 512,
56 128,
57 16,
58 16,
59 16,
60 };
61
62 struct policydb_compat_info {
63 int version;
64 int sym_num;
65 int ocon_num;
66 };
67
68 /* These need to be updated if SYM_NUM or OCON_NUM changes */
69 static struct policydb_compat_info policydb_compat[] = {
70 {
71 .version = POLICYDB_VERSION_BASE,
72 .sym_num = SYM_NUM - 3,
73 .ocon_num = OCON_NUM - 1,
74 },
75 {
76 .version = POLICYDB_VERSION_BOOL,
77 .sym_num = SYM_NUM - 2,
78 .ocon_num = OCON_NUM - 1,
79 },
80 {
81 .version = POLICYDB_VERSION_IPV6,
82 .sym_num = SYM_NUM - 2,
83 .ocon_num = OCON_NUM,
84 },
85 {
86 .version = POLICYDB_VERSION_NLCLASS,
87 .sym_num = SYM_NUM - 2,
88 .ocon_num = OCON_NUM,
89 },
90 {
91 .version = POLICYDB_VERSION_MLS,
92 .sym_num = SYM_NUM,
93 .ocon_num = OCON_NUM,
94 },
95 {
96 .version = POLICYDB_VERSION_AVTAB,
97 .sym_num = SYM_NUM,
98 .ocon_num = OCON_NUM,
99 },
100 {
101 .version = POLICYDB_VERSION_RANGETRANS,
102 .sym_num = SYM_NUM,
103 .ocon_num = OCON_NUM,
104 },
105 };
106
107 static struct policydb_compat_info *policydb_lookup_compat(int version)
108 {
109 int i;
110 struct policydb_compat_info *info = NULL;
111
112 for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) {
113 if (policydb_compat[i].version == version) {
114 info = &policydb_compat[i];
115 break;
116 }
117 }
118 return info;
119 }
120
121 /*
122 * Initialize the role table.
123 */
124 static int roles_init(struct policydb *p)
125 {
126 char *key = NULL;
127 int rc;
128 struct role_datum *role;
129
130 role = kzalloc(sizeof(*role), GFP_KERNEL);
131 if (!role) {
132 rc = -ENOMEM;
133 goto out;
134 }
135 role->value = ++p->p_roles.nprim;
136 if (role->value != OBJECT_R_VAL) {
137 rc = -EINVAL;
138 goto out_free_role;
139 }
140 key = kmalloc(strlen(OBJECT_R)+1,GFP_KERNEL);
141 if (!key) {
142 rc = -ENOMEM;
143 goto out_free_role;
144 }
145 strcpy(key, OBJECT_R);
146 rc = hashtab_insert(p->p_roles.table, key, role);
147 if (rc)
148 goto out_free_key;
149 out:
150 return rc;
151
152 out_free_key:
153 kfree(key);
154 out_free_role:
155 kfree(role);
156 goto out;
157 }
158
159 /*
160 * Initialize a policy database structure.
161 */
162 static int policydb_init(struct policydb *p)
163 {
164 int i, rc;
165
166 memset(p, 0, sizeof(*p));
167
168 for (i = 0; i < SYM_NUM; i++) {
169 rc = symtab_init(&p->symtab[i], symtab_sizes[i]);
170 if (rc)
171 goto out_free_symtab;
172 }
173
174 rc = avtab_init(&p->te_avtab);
175 if (rc)
176 goto out_free_symtab;
177
178 rc = roles_init(p);
179 if (rc)
180 goto out_free_symtab;
181
182 rc = cond_policydb_init(p);
183 if (rc)
184 goto out_free_symtab;
185
186 out:
187 return rc;
188
189 out_free_symtab:
190 for (i = 0; i < SYM_NUM; i++)
191 hashtab_destroy(p->symtab[i].table);
192 goto out;
193 }
194
195 /*
196 * The following *_index functions are used to
197 * define the val_to_name and val_to_struct arrays
198 * in a policy database structure. The val_to_name
199 * arrays are used when converting security context
200 * structures into string representations. The
201 * val_to_struct arrays are used when the attributes
202 * of a class, role, or user are needed.
203 */
204
205 static int common_index(void *key, void *datum, void *datap)
206 {
207 struct policydb *p;
208 struct common_datum *comdatum;
209
210 comdatum = datum;
211 p = datap;
212 if (!comdatum->value || comdatum->value > p->p_commons.nprim)
213 return -EINVAL;
214 p->p_common_val_to_name[comdatum->value - 1] = key;
215 return 0;
216 }
217
218 static int class_index(void *key, void *datum, void *datap)
219 {
220 struct policydb *p;
221 struct class_datum *cladatum;
222
223 cladatum = datum;
224 p = datap;
225 if (!cladatum->value || cladatum->value > p->p_classes.nprim)
226 return -EINVAL;
227 p->p_class_val_to_name[cladatum->value - 1] = key;
228 p->class_val_to_struct[cladatum->value - 1] = cladatum;
229 return 0;
230 }
231
232 static int role_index(void *key, void *datum, void *datap)
233 {
234 struct policydb *p;
235 struct role_datum *role;
236
237 role = datum;
238 p = datap;
239 if (!role->value || role->value > p->p_roles.nprim)
240 return -EINVAL;
241 p->p_role_val_to_name[role->value - 1] = key;
242 p->role_val_to_struct[role->value - 1] = role;
243 return 0;
244 }
245
246 static int type_index(void *key, void *datum, void *datap)
247 {
248 struct policydb *p;
249 struct type_datum *typdatum;
250
251 typdatum = datum;
252 p = datap;
253
254 if (typdatum->primary) {
255 if (!typdatum->value || typdatum->value > p->p_types.nprim)
256 return -EINVAL;
257 p->p_type_val_to_name[typdatum->value - 1] = key;
258 }
259
260 return 0;
261 }
262
263 static int user_index(void *key, void *datum, void *datap)
264 {
265 struct policydb *p;
266 struct user_datum *usrdatum;
267
268 usrdatum = datum;
269 p = datap;
270 if (!usrdatum->value || usrdatum->value > p->p_users.nprim)
271 return -EINVAL;
272 p->p_user_val_to_name[usrdatum->value - 1] = key;
273 p->user_val_to_struct[usrdatum->value - 1] = usrdatum;
274 return 0;
275 }
276
277 static int sens_index(void *key, void *datum, void *datap)
278 {
279 struct policydb *p;
280 struct level_datum *levdatum;
281
282 levdatum = datum;
283 p = datap;
284
285 if (!levdatum->isalias) {
286 if (!levdatum->level->sens ||
287 levdatum->level->sens > p->p_levels.nprim)
288 return -EINVAL;
289 p->p_sens_val_to_name[levdatum->level->sens - 1] = key;
290 }
291
292 return 0;
293 }
294
295 static int cat_index(void *key, void *datum, void *datap)
296 {
297 struct policydb *p;
298 struct cat_datum *catdatum;
299
300 catdatum = datum;
301 p = datap;
302
303 if (!catdatum->isalias) {
304 if (!catdatum->value || catdatum->value > p->p_cats.nprim)
305 return -EINVAL;
306 p->p_cat_val_to_name[catdatum->value - 1] = key;
307 }
308
309 return 0;
310 }
311
312 static int (*index_f[SYM_NUM]) (void *key, void *datum, void *datap) =
313 {
314 common_index,
315 class_index,
316 role_index,
317 type_index,
318 user_index,
319 cond_index_bool,
320 sens_index,
321 cat_index,
322 };
323
324 /*
325 * Define the common val_to_name array and the class
326 * val_to_name and val_to_struct arrays in a policy
327 * database structure.
328 *
329 * Caller must clean up upon failure.
330 */
331 static int policydb_index_classes(struct policydb *p)
332 {
333 int rc;
334
335 p->p_common_val_to_name =
336 kmalloc(p->p_commons.nprim * sizeof(char *), GFP_KERNEL);
337 if (!p->p_common_val_to_name) {
338 rc = -ENOMEM;
339 goto out;
340 }
341
342 rc = hashtab_map(p->p_commons.table, common_index, p);
343 if (rc)
344 goto out;
345
346 p->class_val_to_struct =
347 kmalloc(p->p_classes.nprim * sizeof(*(p->class_val_to_struct)), GFP_KERNEL);
348 if (!p->class_val_to_struct) {
349 rc = -ENOMEM;
350 goto out;
351 }
352
353 p->p_class_val_to_name =
354 kmalloc(p->p_classes.nprim * sizeof(char *), GFP_KERNEL);
355 if (!p->p_class_val_to_name) {
356 rc = -ENOMEM;
357 goto out;
358 }
359
360 rc = hashtab_map(p->p_classes.table, class_index, p);
361 out:
362 return rc;
363 }
364
365 #ifdef DEBUG_HASHES
366 static void symtab_hash_eval(struct symtab *s)
367 {
368 int i;
369
370 for (i = 0; i < SYM_NUM; i++) {
371 struct hashtab *h = s[i].table;
372 struct hashtab_info info;
373
374 hashtab_stat(h, &info);
375 printk(KERN_DEBUG "%s: %d entries and %d/%d buckets used, "
376 "longest chain length %d\n", symtab_name[i], h->nel,
377 info.slots_used, h->size, info.max_chain_len);
378 }
379 }
380 #endif
381
382 /*
383 * Define the other val_to_name and val_to_struct arrays
384 * in a policy database structure.
385 *
386 * Caller must clean up on failure.
387 */
388 static int policydb_index_others(struct policydb *p)
389 {
390 int i, rc = 0;
391
392 printk(KERN_DEBUG "security: %d users, %d roles, %d types, %d bools",
393 p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim, p->p_bools.nprim);
394 if (selinux_mls_enabled)
395 printk(", %d sens, %d cats", p->p_levels.nprim,
396 p->p_cats.nprim);
397 printk("\n");
398
399 printk(KERN_DEBUG "security: %d classes, %d rules\n",
400 p->p_classes.nprim, p->te_avtab.nel);
401
402 #ifdef DEBUG_HASHES
403 avtab_hash_eval(&p->te_avtab, "rules");
404 symtab_hash_eval(p->symtab);
405 #endif
406
407 p->role_val_to_struct =
408 kmalloc(p->p_roles.nprim * sizeof(*(p->role_val_to_struct)),
409 GFP_KERNEL);
410 if (!p->role_val_to_struct) {
411 rc = -ENOMEM;
412 goto out;
413 }
414
415 p->user_val_to_struct =
416 kmalloc(p->p_users.nprim * sizeof(*(p->user_val_to_struct)),
417 GFP_KERNEL);
418 if (!p->user_val_to_struct) {
419 rc = -ENOMEM;
420 goto out;
421 }
422
423 if (cond_init_bool_indexes(p)) {
424 rc = -ENOMEM;
425 goto out;
426 }
427
428 for (i = SYM_ROLES; i < SYM_NUM; i++) {
429 p->sym_val_to_name[i] =
430 kmalloc(p->symtab[i].nprim * sizeof(char *), GFP_KERNEL);
431 if (!p->sym_val_to_name[i]) {
432 rc = -ENOMEM;
433 goto out;
434 }
435 rc = hashtab_map(p->symtab[i].table, index_f[i], p);
436 if (rc)
437 goto out;
438 }
439
440 out:
441 return rc;
442 }
443
444 /*
445 * The following *_destroy functions are used to
446 * free any memory allocated for each kind of
447 * symbol data in the policy database.
448 */
449
450 static int perm_destroy(void *key, void *datum, void *p)
451 {
452 kfree(key);
453 kfree(datum);
454 return 0;
455 }
456
457 static int common_destroy(void *key, void *datum, void *p)
458 {
459 struct common_datum *comdatum;
460
461 kfree(key);
462 comdatum = datum;
463 hashtab_map(comdatum->permissions.table, perm_destroy, NULL);
464 hashtab_destroy(comdatum->permissions.table);
465 kfree(datum);
466 return 0;
467 }
468
469 static int cls_destroy(void *key, void *datum, void *p)
470 {
471 struct class_datum *cladatum;
472 struct constraint_node *constraint, *ctemp;
473 struct constraint_expr *e, *etmp;
474
475 kfree(key);
476 cladatum = datum;
477 hashtab_map(cladatum->permissions.table, perm_destroy, NULL);
478 hashtab_destroy(cladatum->permissions.table);
479 constraint = cladatum->constraints;
480 while (constraint) {
481 e = constraint->expr;
482 while (e) {
483 ebitmap_destroy(&e->names);
484 etmp = e;
485 e = e->next;
486 kfree(etmp);
487 }
488 ctemp = constraint;
489 constraint = constraint->next;
490 kfree(ctemp);
491 }
492
493 constraint = cladatum->validatetrans;
494 while (constraint) {
495 e = constraint->expr;
496 while (e) {
497 ebitmap_destroy(&e->names);
498 etmp = e;
499 e = e->next;
500 kfree(etmp);
501 }
502 ctemp = constraint;
503 constraint = constraint->next;
504 kfree(ctemp);
505 }
506
507 kfree(cladatum->comkey);
508 kfree(datum);
509 return 0;
510 }
511
512 static int role_destroy(void *key, void *datum, void *p)
513 {
514 struct role_datum *role;
515
516 kfree(key);
517 role = datum;
518 ebitmap_destroy(&role->dominates);
519 ebitmap_destroy(&role->types);
520 kfree(datum);
521 return 0;
522 }
523
524 static int type_destroy(void *key, void *datum, void *p)
525 {
526 kfree(key);
527 kfree(datum);
528 return 0;
529 }
530
531 static int user_destroy(void *key, void *datum, void *p)
532 {
533 struct user_datum *usrdatum;
534
535 kfree(key);
536 usrdatum = datum;
537 ebitmap_destroy(&usrdatum->roles);
538 ebitmap_destroy(&usrdatum->range.level[0].cat);
539 ebitmap_destroy(&usrdatum->range.level[1].cat);
540 ebitmap_destroy(&usrdatum->dfltlevel.cat);
541 kfree(datum);
542 return 0;
543 }
544
545 static int sens_destroy(void *key, void *datum, void *p)
546 {
547 struct level_datum *levdatum;
548
549 kfree(key);
550 levdatum = datum;
551 ebitmap_destroy(&levdatum->level->cat);
552 kfree(levdatum->level);
553 kfree(datum);
554 return 0;
555 }
556
557 static int cat_destroy(void *key, void *datum, void *p)
558 {
559 kfree(key);
560 kfree(datum);
561 return 0;
562 }
563
564 static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) =
565 {
566 common_destroy,
567 cls_destroy,
568 role_destroy,
569 type_destroy,
570 user_destroy,
571 cond_destroy_bool,
572 sens_destroy,
573 cat_destroy,
574 };
575
576 static void ocontext_destroy(struct ocontext *c, int i)
577 {
578 context_destroy(&c->context[0]);
579 context_destroy(&c->context[1]);
580 if (i == OCON_ISID || i == OCON_FS ||
581 i == OCON_NETIF || i == OCON_FSUSE)
582 kfree(c->u.name);
583 kfree(c);
584 }
585
586 /*
587 * Free any memory allocated by a policy database structure.
588 */
589 void policydb_destroy(struct policydb *p)
590 {
591 struct ocontext *c, *ctmp;
592 struct genfs *g, *gtmp;
593 int i;
594 struct role_allow *ra, *lra = NULL;
595 struct role_trans *tr, *ltr = NULL;
596 struct range_trans *rt, *lrt = NULL;
597
598 for (i = 0; i < SYM_NUM; i++) {
599 cond_resched();
600 hashtab_map(p->symtab[i].table, destroy_f[i], NULL);
601 hashtab_destroy(p->symtab[i].table);
602 }
603
604 for (i = 0; i < SYM_NUM; i++)
605 kfree(p->sym_val_to_name[i]);
606
607 kfree(p->class_val_to_struct);
608 kfree(p->role_val_to_struct);
609 kfree(p->user_val_to_struct);
610
611 avtab_destroy(&p->te_avtab);
612
613 for (i = 0; i < OCON_NUM; i++) {
614 cond_resched();
615 c = p->ocontexts[i];
616 while (c) {
617 ctmp = c;
618 c = c->next;
619 ocontext_destroy(ctmp,i);
620 }
621 p->ocontexts[i] = NULL;
622 }
623
624 g = p->genfs;
625 while (g) {
626 cond_resched();
627 kfree(g->fstype);
628 c = g->head;
629 while (c) {
630 ctmp = c;
631 c = c->next;
632 ocontext_destroy(ctmp,OCON_FSUSE);
633 }
634 gtmp = g;
635 g = g->next;
636 kfree(gtmp);
637 }
638 p->genfs = NULL;
639
640 cond_policydb_destroy(p);
641
642 for (tr = p->role_tr; tr; tr = tr->next) {
643 cond_resched();
644 kfree(ltr);
645 ltr = tr;
646 }
647 kfree(ltr);
648
649 for (ra = p->role_allow; ra; ra = ra -> next) {
650 cond_resched();
651 kfree(lra);
652 lra = ra;
653 }
654 kfree(lra);
655
656 for (rt = p->range_tr; rt; rt = rt -> next) {
657 cond_resched();
658 if (lrt) {
659 ebitmap_destroy(&lrt->target_range.level[0].cat);
660 ebitmap_destroy(&lrt->target_range.level[1].cat);
661 kfree(lrt);
662 }
663 lrt = rt;
664 }
665 if (lrt) {
666 ebitmap_destroy(&lrt->target_range.level[0].cat);
667 ebitmap_destroy(&lrt->target_range.level[1].cat);
668 kfree(lrt);
669 }
670
671 if (p->type_attr_map) {
672 for (i = 0; i < p->p_types.nprim; i++)
673 ebitmap_destroy(&p->type_attr_map[i]);
674 }
675 kfree(p->type_attr_map);
676
677 kfree(p->undefined_perms);
678
679 return;
680 }
681
682 /*
683 * Load the initial SIDs specified in a policy database
684 * structure into a SID table.
685 */
686 int policydb_load_isids(struct policydb *p, struct sidtab *s)
687 {
688 struct ocontext *head, *c;
689 int rc;
690
691 rc = sidtab_init(s);
692 if (rc) {
693 printk(KERN_ERR "security: out of memory on SID table init\n");
694 goto out;
695 }
696
697 head = p->ocontexts[OCON_ISID];
698 for (c = head; c; c = c->next) {
699 if (!c->context[0].user) {
700 printk(KERN_ERR "security: SID %s was never "
701 "defined.\n", c->u.name);
702 rc = -EINVAL;
703 goto out;
704 }
705 if (sidtab_insert(s, c->sid[0], &c->context[0])) {
706 printk(KERN_ERR "security: unable to load initial "
707 "SID %s.\n", c->u.name);
708 rc = -EINVAL;
709 goto out;
710 }
711 }
712 out:
713 return rc;
714 }
715
716 /*
717 * Return 1 if the fields in the security context
718 * structure `c' are valid. Return 0 otherwise.
719 */
720 int policydb_context_isvalid(struct policydb *p, struct context *c)
721 {
722 struct role_datum *role;
723 struct user_datum *usrdatum;
724
725 if (!c->role || c->role > p->p_roles.nprim)
726 return 0;
727
728 if (!c->user || c->user > p->p_users.nprim)
729 return 0;
730
731 if (!c->type || c->type > p->p_types.nprim)
732 return 0;
733
734 if (c->role != OBJECT_R_VAL) {
735 /*
736 * Role must be authorized for the type.
737 */
738 role = p->role_val_to_struct[c->role - 1];
739 if (!ebitmap_get_bit(&role->types,
740 c->type - 1))
741 /* role may not be associated with type */
742 return 0;
743
744 /*
745 * User must be authorized for the role.
746 */
747 usrdatum = p->user_val_to_struct[c->user - 1];
748 if (!usrdatum)
749 return 0;
750
751 if (!ebitmap_get_bit(&usrdatum->roles,
752 c->role - 1))
753 /* user may not be associated with role */
754 return 0;
755 }
756
757 if (!mls_context_isvalid(p, c))
758 return 0;
759
760 return 1;
761 }
762
763 /*
764 * Read a MLS range structure from a policydb binary
765 * representation file.
766 */
767 static int mls_read_range_helper(struct mls_range *r, void *fp)
768 {
769 __le32 buf[2];
770 u32 items;
771 int rc;
772
773 rc = next_entry(buf, fp, sizeof(u32));
774 if (rc < 0)
775 goto out;
776
777 items = le32_to_cpu(buf[0]);
778 if (items > ARRAY_SIZE(buf)) {
779 printk(KERN_ERR "security: mls: range overflow\n");
780 rc = -EINVAL;
781 goto out;
782 }
783 rc = next_entry(buf, fp, sizeof(u32) * items);
784 if (rc < 0) {
785 printk(KERN_ERR "security: mls: truncated range\n");
786 goto out;
787 }
788 r->level[0].sens = le32_to_cpu(buf[0]);
789 if (items > 1)
790 r->level[1].sens = le32_to_cpu(buf[1]);
791 else
792 r->level[1].sens = r->level[0].sens;
793
794 rc = ebitmap_read(&r->level[0].cat, fp);
795 if (rc) {
796 printk(KERN_ERR "security: mls: error reading low "
797 "categories\n");
798 goto out;
799 }
800 if (items > 1) {
801 rc = ebitmap_read(&r->level[1].cat, fp);
802 if (rc) {
803 printk(KERN_ERR "security: mls: error reading high "
804 "categories\n");
805 goto bad_high;
806 }
807 } else {
808 rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat);
809 if (rc) {
810 printk(KERN_ERR "security: mls: out of memory\n");
811 goto bad_high;
812 }
813 }
814
815 rc = 0;
816 out:
817 return rc;
818 bad_high:
819 ebitmap_destroy(&r->level[0].cat);
820 goto out;
821 }
822
823 /*
824 * Read and validate a security context structure
825 * from a policydb binary representation file.
826 */
827 static int context_read_and_validate(struct context *c,
828 struct policydb *p,
829 void *fp)
830 {
831 __le32 buf[3];
832 int rc;
833
834 rc = next_entry(buf, fp, sizeof buf);
835 if (rc < 0) {
836 printk(KERN_ERR "security: context truncated\n");
837 goto out;
838 }
839 c->user = le32_to_cpu(buf[0]);
840 c->role = le32_to_cpu(buf[1]);
841 c->type = le32_to_cpu(buf[2]);
842 if (p->policyvers >= POLICYDB_VERSION_MLS) {
843 if (mls_read_range_helper(&c->range, fp)) {
844 printk(KERN_ERR "security: error reading MLS range of "
845 "context\n");
846 rc = -EINVAL;
847 goto out;
848 }
849 }
850
851 if (!policydb_context_isvalid(p, c)) {
852 printk(KERN_ERR "security: invalid security context\n");
853 context_destroy(c);
854 rc = -EINVAL;
855 }
856 out:
857 return rc;
858 }
859
860 /*
861 * The following *_read functions are used to
862 * read the symbol data from a policy database
863 * binary representation file.
864 */
865
866 static int perm_read(struct policydb *p, struct hashtab *h, void *fp)
867 {
868 char *key = NULL;
869 struct perm_datum *perdatum;
870 int rc;
871 __le32 buf[2];
872 u32 len;
873
874 perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
875 if (!perdatum) {
876 rc = -ENOMEM;
877 goto out;
878 }
879
880 rc = next_entry(buf, fp, sizeof buf);
881 if (rc < 0)
882 goto bad;
883
884 len = le32_to_cpu(buf[0]);
885 perdatum->value = le32_to_cpu(buf[1]);
886
887 key = kmalloc(len + 1,GFP_KERNEL);
888 if (!key) {
889 rc = -ENOMEM;
890 goto bad;
891 }
892 rc = next_entry(key, fp, len);
893 if (rc < 0)
894 goto bad;
895 key[len] = 0;
896
897 rc = hashtab_insert(h, key, perdatum);
898 if (rc)
899 goto bad;
900 out:
901 return rc;
902 bad:
903 perm_destroy(key, perdatum, NULL);
904 goto out;
905 }
906
907 static int common_read(struct policydb *p, struct hashtab *h, void *fp)
908 {
909 char *key = NULL;
910 struct common_datum *comdatum;
911 __le32 buf[4];
912 u32 len, nel;
913 int i, rc;
914
915 comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
916 if (!comdatum) {
917 rc = -ENOMEM;
918 goto out;
919 }
920
921 rc = next_entry(buf, fp, sizeof buf);
922 if (rc < 0)
923 goto bad;
924
925 len = le32_to_cpu(buf[0]);
926 comdatum->value = le32_to_cpu(buf[1]);
927
928 rc = symtab_init(&comdatum->permissions, PERM_SYMTAB_SIZE);
929 if (rc)
930 goto bad;
931 comdatum->permissions.nprim = le32_to_cpu(buf[2]);
932 nel = le32_to_cpu(buf[3]);
933
934 key = kmalloc(len + 1,GFP_KERNEL);
935 if (!key) {
936 rc = -ENOMEM;
937 goto bad;
938 }
939 rc = next_entry(key, fp, len);
940 if (rc < 0)
941 goto bad;
942 key[len] = 0;
943
944 for (i = 0; i < nel; i++) {
945 rc = perm_read(p, comdatum->permissions.table, fp);
946 if (rc)
947 goto bad;
948 }
949
950 rc = hashtab_insert(h, key, comdatum);
951 if (rc)
952 goto bad;
953 out:
954 return rc;
955 bad:
956 common_destroy(key, comdatum, NULL);
957 goto out;
958 }
959
960 static int read_cons_helper(struct constraint_node **nodep, int ncons,
961 int allowxtarget, void *fp)
962 {
963 struct constraint_node *c, *lc;
964 struct constraint_expr *e, *le;
965 __le32 buf[3];
966 u32 nexpr;
967 int rc, i, j, depth;
968
969 lc = NULL;
970 for (i = 0; i < ncons; i++) {
971 c = kzalloc(sizeof(*c), GFP_KERNEL);
972 if (!c)
973 return -ENOMEM;
974
975 if (lc) {
976 lc->next = c;
977 } else {
978 *nodep = c;
979 }
980
981 rc = next_entry(buf, fp, (sizeof(u32) * 2));
982 if (rc < 0)
983 return rc;
984 c->permissions = le32_to_cpu(buf[0]);
985 nexpr = le32_to_cpu(buf[1]);
986 le = NULL;
987 depth = -1;
988 for (j = 0; j < nexpr; j++) {
989 e = kzalloc(sizeof(*e), GFP_KERNEL);
990 if (!e)
991 return -ENOMEM;
992
993 if (le) {
994 le->next = e;
995 } else {
996 c->expr = e;
997 }
998
999 rc = next_entry(buf, fp, (sizeof(u32) * 3));
1000 if (rc < 0)
1001 return rc;
1002 e->expr_type = le32_to_cpu(buf[0]);
1003 e->attr = le32_to_cpu(buf[1]);
1004 e->op = le32_to_cpu(buf[2]);
1005
1006 switch (e->expr_type) {
1007 case CEXPR_NOT:
1008 if (depth < 0)
1009 return -EINVAL;
1010 break;
1011 case CEXPR_AND:
1012 case CEXPR_OR:
1013 if (depth < 1)
1014 return -EINVAL;
1015 depth--;
1016 break;
1017 case CEXPR_ATTR:
1018 if (depth == (CEXPR_MAXDEPTH - 1))
1019 return -EINVAL;
1020 depth++;
1021 break;
1022 case CEXPR_NAMES:
1023 if (!allowxtarget && (e->attr & CEXPR_XTARGET))
1024 return -EINVAL;
1025 if (depth == (CEXPR_MAXDEPTH - 1))
1026 return -EINVAL;
1027 depth++;
1028 if (ebitmap_read(&e->names, fp))
1029 return -EINVAL;
1030 break;
1031 default:
1032 return -EINVAL;
1033 }
1034 le = e;
1035 }
1036 if (depth != 0)
1037 return -EINVAL;
1038 lc = c;
1039 }
1040
1041 return 0;
1042 }
1043
1044 static int class_read(struct policydb *p, struct hashtab *h, void *fp)
1045 {
1046 char *key = NULL;
1047 struct class_datum *cladatum;
1048 __le32 buf[6];
1049 u32 len, len2, ncons, nel;
1050 int i, rc;
1051
1052 cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
1053 if (!cladatum) {
1054 rc = -ENOMEM;
1055 goto out;
1056 }
1057
1058 rc = next_entry(buf, fp, sizeof(u32)*6);
1059 if (rc < 0)
1060 goto bad;
1061
1062 len = le32_to_cpu(buf[0]);
1063 len2 = le32_to_cpu(buf[1]);
1064 cladatum->value = le32_to_cpu(buf[2]);
1065
1066 rc = symtab_init(&cladatum->permissions, PERM_SYMTAB_SIZE);
1067 if (rc)
1068 goto bad;
1069 cladatum->permissions.nprim = le32_to_cpu(buf[3]);
1070 nel = le32_to_cpu(buf[4]);
1071
1072 ncons = le32_to_cpu(buf[5]);
1073
1074 key = kmalloc(len + 1,GFP_KERNEL);
1075 if (!key) {
1076 rc = -ENOMEM;
1077 goto bad;
1078 }
1079 rc = next_entry(key, fp, len);
1080 if (rc < 0)
1081 goto bad;
1082 key[len] = 0;
1083
1084 if (len2) {
1085 cladatum->comkey = kmalloc(len2 + 1,GFP_KERNEL);
1086 if (!cladatum->comkey) {
1087 rc = -ENOMEM;
1088 goto bad;
1089 }
1090 rc = next_entry(cladatum->comkey, fp, len2);
1091 if (rc < 0)
1092 goto bad;
1093 cladatum->comkey[len2] = 0;
1094
1095 cladatum->comdatum = hashtab_search(p->p_commons.table,
1096 cladatum->comkey);
1097 if (!cladatum->comdatum) {
1098 printk(KERN_ERR "security: unknown common %s\n",
1099 cladatum->comkey);
1100 rc = -EINVAL;
1101 goto bad;
1102 }
1103 }
1104 for (i = 0; i < nel; i++) {
1105 rc = perm_read(p, cladatum->permissions.table, fp);
1106 if (rc)
1107 goto bad;
1108 }
1109
1110 rc = read_cons_helper(&cladatum->constraints, ncons, 0, fp);
1111 if (rc)
1112 goto bad;
1113
1114 if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
1115 /* grab the validatetrans rules */
1116 rc = next_entry(buf, fp, sizeof(u32));
1117 if (rc < 0)
1118 goto bad;
1119 ncons = le32_to_cpu(buf[0]);
1120 rc = read_cons_helper(&cladatum->validatetrans, ncons, 1, fp);
1121 if (rc)
1122 goto bad;
1123 }
1124
1125 rc = hashtab_insert(h, key, cladatum);
1126 if (rc)
1127 goto bad;
1128
1129 rc = 0;
1130 out:
1131 return rc;
1132 bad:
1133 cls_destroy(key, cladatum, NULL);
1134 goto out;
1135 }
1136
1137 static int role_read(struct policydb *p, struct hashtab *h, void *fp)
1138 {
1139 char *key = NULL;
1140 struct role_datum *role;
1141 int rc;
1142 __le32 buf[2];
1143 u32 len;
1144
1145 role = kzalloc(sizeof(*role), GFP_KERNEL);
1146 if (!role) {
1147 rc = -ENOMEM;
1148 goto out;
1149 }
1150
1151 rc = next_entry(buf, fp, sizeof buf);
1152 if (rc < 0)
1153 goto bad;
1154
1155 len = le32_to_cpu(buf[0]);
1156 role->value = le32_to_cpu(buf[1]);
1157
1158 key = kmalloc(len + 1,GFP_KERNEL);
1159 if (!key) {
1160 rc = -ENOMEM;
1161 goto bad;
1162 }
1163 rc = next_entry(key, fp, len);
1164 if (rc < 0)
1165 goto bad;
1166 key[len] = 0;
1167
1168 rc = ebitmap_read(&role->dominates, fp);
1169 if (rc)
1170 goto bad;
1171
1172 rc = ebitmap_read(&role->types, fp);
1173 if (rc)
1174 goto bad;
1175
1176 if (strcmp(key, OBJECT_R) == 0) {
1177 if (role->value != OBJECT_R_VAL) {
1178 printk(KERN_ERR "Role %s has wrong value %d\n",
1179 OBJECT_R, role->value);
1180 rc = -EINVAL;
1181 goto bad;
1182 }
1183 rc = 0;
1184 goto bad;
1185 }
1186
1187 rc = hashtab_insert(h, key, role);
1188 if (rc)
1189 goto bad;
1190 out:
1191 return rc;
1192 bad:
1193 role_destroy(key, role, NULL);
1194 goto out;
1195 }
1196
1197 static int type_read(struct policydb *p, struct hashtab *h, void *fp)
1198 {
1199 char *key = NULL;
1200 struct type_datum *typdatum;
1201 int rc;
1202 __le32 buf[3];
1203 u32 len;
1204
1205 typdatum = kzalloc(sizeof(*typdatum),GFP_KERNEL);
1206 if (!typdatum) {
1207 rc = -ENOMEM;
1208 return rc;
1209 }
1210
1211 rc = next_entry(buf, fp, sizeof buf);
1212 if (rc < 0)
1213 goto bad;
1214
1215 len = le32_to_cpu(buf[0]);
1216 typdatum->value = le32_to_cpu(buf[1]);
1217 typdatum->primary = le32_to_cpu(buf[2]);
1218
1219 key = kmalloc(len + 1,GFP_KERNEL);
1220 if (!key) {
1221 rc = -ENOMEM;
1222 goto bad;
1223 }
1224 rc = next_entry(key, fp, len);
1225 if (rc < 0)
1226 goto bad;
1227 key[len] = 0;
1228
1229 rc = hashtab_insert(h, key, typdatum);
1230 if (rc)
1231 goto bad;
1232 out:
1233 return rc;
1234 bad:
1235 type_destroy(key, typdatum, NULL);
1236 goto out;
1237 }
1238
1239
1240 /*
1241 * Read a MLS level structure from a policydb binary
1242 * representation file.
1243 */
1244 static int mls_read_level(struct mls_level *lp, void *fp)
1245 {
1246 __le32 buf[1];
1247 int rc;
1248
1249 memset(lp, 0, sizeof(*lp));
1250
1251 rc = next_entry(buf, fp, sizeof buf);
1252 if (rc < 0) {
1253 printk(KERN_ERR "security: mls: truncated level\n");
1254 goto bad;
1255 }
1256 lp->sens = le32_to_cpu(buf[0]);
1257
1258 if (ebitmap_read(&lp->cat, fp)) {
1259 printk(KERN_ERR "security: mls: error reading level "
1260 "categories\n");
1261 goto bad;
1262 }
1263 return 0;
1264
1265 bad:
1266 return -EINVAL;
1267 }
1268
1269 static int user_read(struct policydb *p, struct hashtab *h, void *fp)
1270 {
1271 char *key = NULL;
1272 struct user_datum *usrdatum;
1273 int rc;
1274 __le32 buf[2];
1275 u32 len;
1276
1277 usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
1278 if (!usrdatum) {
1279 rc = -ENOMEM;
1280 goto out;
1281 }
1282
1283 rc = next_entry(buf, fp, sizeof buf);
1284 if (rc < 0)
1285 goto bad;
1286
1287 len = le32_to_cpu(buf[0]);
1288 usrdatum->value = le32_to_cpu(buf[1]);
1289
1290 key = kmalloc(len + 1,GFP_KERNEL);
1291 if (!key) {
1292 rc = -ENOMEM;
1293 goto bad;
1294 }
1295 rc = next_entry(key, fp, len);
1296 if (rc < 0)
1297 goto bad;
1298 key[len] = 0;
1299
1300 rc = ebitmap_read(&usrdatum->roles, fp);
1301 if (rc)
1302 goto bad;
1303
1304 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1305 rc = mls_read_range_helper(&usrdatum->range, fp);
1306 if (rc)
1307 goto bad;
1308 rc = mls_read_level(&usrdatum->dfltlevel, fp);
1309 if (rc)
1310 goto bad;
1311 }
1312
1313 rc = hashtab_insert(h, key, usrdatum);
1314 if (rc)
1315 goto bad;
1316 out:
1317 return rc;
1318 bad:
1319 user_destroy(key, usrdatum, NULL);
1320 goto out;
1321 }
1322
1323 static int sens_read(struct policydb *p, struct hashtab *h, void *fp)
1324 {
1325 char *key = NULL;
1326 struct level_datum *levdatum;
1327 int rc;
1328 __le32 buf[2];
1329 u32 len;
1330
1331 levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC);
1332 if (!levdatum) {
1333 rc = -ENOMEM;
1334 goto out;
1335 }
1336
1337 rc = next_entry(buf, fp, sizeof buf);
1338 if (rc < 0)
1339 goto bad;
1340
1341 len = le32_to_cpu(buf[0]);
1342 levdatum->isalias = le32_to_cpu(buf[1]);
1343
1344 key = kmalloc(len + 1,GFP_ATOMIC);
1345 if (!key) {
1346 rc = -ENOMEM;
1347 goto bad;
1348 }
1349 rc = next_entry(key, fp, len);
1350 if (rc < 0)
1351 goto bad;
1352 key[len] = 0;
1353
1354 levdatum->level = kmalloc(sizeof(struct mls_level), GFP_ATOMIC);
1355 if (!levdatum->level) {
1356 rc = -ENOMEM;
1357 goto bad;
1358 }
1359 if (mls_read_level(levdatum->level, fp)) {
1360 rc = -EINVAL;
1361 goto bad;
1362 }
1363
1364 rc = hashtab_insert(h, key, levdatum);
1365 if (rc)
1366 goto bad;
1367 out:
1368 return rc;
1369 bad:
1370 sens_destroy(key, levdatum, NULL);
1371 goto out;
1372 }
1373
1374 static int cat_read(struct policydb *p, struct hashtab *h, void *fp)
1375 {
1376 char *key = NULL;
1377 struct cat_datum *catdatum;
1378 int rc;
1379 __le32 buf[3];
1380 u32 len;
1381
1382 catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC);
1383 if (!catdatum) {
1384 rc = -ENOMEM;
1385 goto out;
1386 }
1387
1388 rc = next_entry(buf, fp, sizeof buf);
1389 if (rc < 0)
1390 goto bad;
1391
1392 len = le32_to_cpu(buf[0]);
1393 catdatum->value = le32_to_cpu(buf[1]);
1394 catdatum->isalias = le32_to_cpu(buf[2]);
1395
1396 key = kmalloc(len + 1,GFP_ATOMIC);
1397 if (!key) {
1398 rc = -ENOMEM;
1399 goto bad;
1400 }
1401 rc = next_entry(key, fp, len);
1402 if (rc < 0)
1403 goto bad;
1404 key[len] = 0;
1405
1406 rc = hashtab_insert(h, key, catdatum);
1407 if (rc)
1408 goto bad;
1409 out:
1410 return rc;
1411
1412 bad:
1413 cat_destroy(key, catdatum, NULL);
1414 goto out;
1415 }
1416
1417 static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, void *fp) =
1418 {
1419 common_read,
1420 class_read,
1421 role_read,
1422 type_read,
1423 user_read,
1424 cond_read_bool,
1425 sens_read,
1426 cat_read,
1427 };
1428
1429 extern int ss_initialized;
1430
1431 /*
1432 * Read the configuration data from a policy database binary
1433 * representation file into a policy database structure.
1434 */
1435 int policydb_read(struct policydb *p, void *fp)
1436 {
1437 struct role_allow *ra, *lra;
1438 struct role_trans *tr, *ltr;
1439 struct ocontext *l, *c, *newc;
1440 struct genfs *genfs_p, *genfs, *newgenfs;
1441 int i, j, rc;
1442 __le32 buf[8];
1443 u32 len, len2, config, nprim, nel, nel2;
1444 char *policydb_str;
1445 struct policydb_compat_info *info;
1446 struct range_trans *rt, *lrt;
1447
1448 config = 0;
1449
1450 rc = policydb_init(p);
1451 if (rc)
1452 goto out;
1453
1454 /* Read the magic number and string length. */
1455 rc = next_entry(buf, fp, sizeof(u32)* 2);
1456 if (rc < 0)
1457 goto bad;
1458
1459 if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
1460 printk(KERN_ERR "security: policydb magic number 0x%x does "
1461 "not match expected magic number 0x%x\n",
1462 le32_to_cpu(buf[0]), POLICYDB_MAGIC);
1463 goto bad;
1464 }
1465
1466 len = le32_to_cpu(buf[1]);
1467 if (len != strlen(POLICYDB_STRING)) {
1468 printk(KERN_ERR "security: policydb string length %d does not "
1469 "match expected length %Zu\n",
1470 len, strlen(POLICYDB_STRING));
1471 goto bad;
1472 }
1473 policydb_str = kmalloc(len + 1,GFP_KERNEL);
1474 if (!policydb_str) {
1475 printk(KERN_ERR "security: unable to allocate memory for policydb "
1476 "string of length %d\n", len);
1477 rc = -ENOMEM;
1478 goto bad;
1479 }
1480 rc = next_entry(policydb_str, fp, len);
1481 if (rc < 0) {
1482 printk(KERN_ERR "security: truncated policydb string identifier\n");
1483 kfree(policydb_str);
1484 goto bad;
1485 }
1486 policydb_str[len] = 0;
1487 if (strcmp(policydb_str, POLICYDB_STRING)) {
1488 printk(KERN_ERR "security: policydb string %s does not match "
1489 "my string %s\n", policydb_str, POLICYDB_STRING);
1490 kfree(policydb_str);
1491 goto bad;
1492 }
1493 /* Done with policydb_str. */
1494 kfree(policydb_str);
1495 policydb_str = NULL;
1496
1497 /* Read the version, config, and table sizes. */
1498 rc = next_entry(buf, fp, sizeof(u32)*4);
1499 if (rc < 0)
1500 goto bad;
1501
1502 p->policyvers = le32_to_cpu(buf[0]);
1503 if (p->policyvers < POLICYDB_VERSION_MIN ||
1504 p->policyvers > POLICYDB_VERSION_MAX) {
1505 printk(KERN_ERR "security: policydb version %d does not match "
1506 "my version range %d-%d\n",
1507 le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
1508 goto bad;
1509 }
1510
1511 if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
1512 if (ss_initialized && !selinux_mls_enabled) {
1513 printk(KERN_ERR "Cannot switch between non-MLS and MLS "
1514 "policies\n");
1515 goto bad;
1516 }
1517 selinux_mls_enabled = 1;
1518 config |= POLICYDB_CONFIG_MLS;
1519
1520 if (p->policyvers < POLICYDB_VERSION_MLS) {
1521 printk(KERN_ERR "security policydb version %d (MLS) "
1522 "not backwards compatible\n", p->policyvers);
1523 goto bad;
1524 }
1525 } else {
1526 if (ss_initialized && selinux_mls_enabled) {
1527 printk(KERN_ERR "Cannot switch between MLS and non-MLS "
1528 "policies\n");
1529 goto bad;
1530 }
1531 }
1532 p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
1533 p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
1534
1535 info = policydb_lookup_compat(p->policyvers);
1536 if (!info) {
1537 printk(KERN_ERR "security: unable to find policy compat info "
1538 "for version %d\n", p->policyvers);
1539 goto bad;
1540 }
1541
1542 if (le32_to_cpu(buf[2]) != info->sym_num ||
1543 le32_to_cpu(buf[3]) != info->ocon_num) {
1544 printk(KERN_ERR "security: policydb table sizes (%d,%d) do "
1545 "not match mine (%d,%d)\n", le32_to_cpu(buf[2]),
1546 le32_to_cpu(buf[3]),
1547 info->sym_num, info->ocon_num);
1548 goto bad;
1549 }
1550
1551 for (i = 0; i < info->sym_num; i++) {
1552 rc = next_entry(buf, fp, sizeof(u32)*2);
1553 if (rc < 0)
1554 goto bad;
1555 nprim = le32_to_cpu(buf[0]);
1556 nel = le32_to_cpu(buf[1]);
1557 for (j = 0; j < nel; j++) {
1558 rc = read_f[i](p, p->symtab[i].table, fp);
1559 if (rc)
1560 goto bad;
1561 }
1562
1563 p->symtab[i].nprim = nprim;
1564 }
1565
1566 rc = avtab_read(&p->te_avtab, fp, p->policyvers);
1567 if (rc)
1568 goto bad;
1569
1570 if (p->policyvers >= POLICYDB_VERSION_BOOL) {
1571 rc = cond_read_list(p, fp);
1572 if (rc)
1573 goto bad;
1574 }
1575
1576 rc = next_entry(buf, fp, sizeof(u32));
1577 if (rc < 0)
1578 goto bad;
1579 nel = le32_to_cpu(buf[0]);
1580 ltr = NULL;
1581 for (i = 0; i < nel; i++) {
1582 tr = kzalloc(sizeof(*tr), GFP_KERNEL);
1583 if (!tr) {
1584 rc = -ENOMEM;
1585 goto bad;
1586 }
1587 if (ltr) {
1588 ltr->next = tr;
1589 } else {
1590 p->role_tr = tr;
1591 }
1592 rc = next_entry(buf, fp, sizeof(u32)*3);
1593 if (rc < 0)
1594 goto bad;
1595 tr->role = le32_to_cpu(buf[0]);
1596 tr->type = le32_to_cpu(buf[1]);
1597 tr->new_role = le32_to_cpu(buf[2]);
1598 ltr = tr;
1599 }
1600
1601 rc = next_entry(buf, fp, sizeof(u32));
1602 if (rc < 0)
1603 goto bad;
1604 nel = le32_to_cpu(buf[0]);
1605 lra = NULL;
1606 for (i = 0; i < nel; i++) {
1607 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
1608 if (!ra) {
1609 rc = -ENOMEM;
1610 goto bad;
1611 }
1612 if (lra) {
1613 lra->next = ra;
1614 } else {
1615 p->role_allow = ra;
1616 }
1617 rc = next_entry(buf, fp, sizeof(u32)*2);
1618 if (rc < 0)
1619 goto bad;
1620 ra->role = le32_to_cpu(buf[0]);
1621 ra->new_role = le32_to_cpu(buf[1]);
1622 lra = ra;
1623 }
1624
1625 rc = policydb_index_classes(p);
1626 if (rc)
1627 goto bad;
1628
1629 rc = policydb_index_others(p);
1630 if (rc)
1631 goto bad;
1632
1633 for (i = 0; i < info->ocon_num; i++) {
1634 rc = next_entry(buf, fp, sizeof(u32));
1635 if (rc < 0)
1636 goto bad;
1637 nel = le32_to_cpu(buf[0]);
1638 l = NULL;
1639 for (j = 0; j < nel; j++) {
1640 c = kzalloc(sizeof(*c), GFP_KERNEL);
1641 if (!c) {
1642 rc = -ENOMEM;
1643 goto bad;
1644 }
1645 if (l) {
1646 l->next = c;
1647 } else {
1648 p->ocontexts[i] = c;
1649 }
1650 l = c;
1651 rc = -EINVAL;
1652 switch (i) {
1653 case OCON_ISID:
1654 rc = next_entry(buf, fp, sizeof(u32));
1655 if (rc < 0)
1656 goto bad;
1657 c->sid[0] = le32_to_cpu(buf[0]);
1658 rc = context_read_and_validate(&c->context[0], p, fp);
1659 if (rc)
1660 goto bad;
1661 break;
1662 case OCON_FS:
1663 case OCON_NETIF:
1664 rc = next_entry(buf, fp, sizeof(u32));
1665 if (rc < 0)
1666 goto bad;
1667 len = le32_to_cpu(buf[0]);
1668 c->u.name = kmalloc(len + 1,GFP_KERNEL);
1669 if (!c->u.name) {
1670 rc = -ENOMEM;
1671 goto bad;
1672 }
1673 rc = next_entry(c->u.name, fp, len);
1674 if (rc < 0)
1675 goto bad;
1676 c->u.name[len] = 0;
1677 rc = context_read_and_validate(&c->context[0], p, fp);
1678 if (rc)
1679 goto bad;
1680 rc = context_read_and_validate(&c->context[1], p, fp);
1681 if (rc)
1682 goto bad;
1683 break;
1684 case OCON_PORT:
1685 rc = next_entry(buf, fp, sizeof(u32)*3);
1686 if (rc < 0)
1687 goto bad;
1688 c->u.port.protocol = le32_to_cpu(buf[0]);
1689 c->u.port.low_port = le32_to_cpu(buf[1]);
1690 c->u.port.high_port = le32_to_cpu(buf[2]);
1691 rc = context_read_and_validate(&c->context[0], p, fp);
1692 if (rc)
1693 goto bad;
1694 break;
1695 case OCON_NODE:
1696 rc = next_entry(buf, fp, sizeof(u32)* 2);
1697 if (rc < 0)
1698 goto bad;
1699 c->u.node.addr = le32_to_cpu(buf[0]);
1700 c->u.node.mask = le32_to_cpu(buf[1]);
1701 rc = context_read_and_validate(&c->context[0], p, fp);
1702 if (rc)
1703 goto bad;
1704 break;
1705 case OCON_FSUSE:
1706 rc = next_entry(buf, fp, sizeof(u32)*2);
1707 if (rc < 0)
1708 goto bad;
1709 c->v.behavior = le32_to_cpu(buf[0]);
1710 if (c->v.behavior > SECURITY_FS_USE_NONE)
1711 goto bad;
1712 len = le32_to_cpu(buf[1]);
1713 c->u.name = kmalloc(len + 1,GFP_KERNEL);
1714 if (!c->u.name) {
1715 rc = -ENOMEM;
1716 goto bad;
1717 }
1718 rc = next_entry(c->u.name, fp, len);
1719 if (rc < 0)
1720 goto bad;
1721 c->u.name[len] = 0;
1722 rc = context_read_and_validate(&c->context[0], p, fp);
1723 if (rc)
1724 goto bad;
1725 break;
1726 case OCON_NODE6: {
1727 int k;
1728
1729 rc = next_entry(buf, fp, sizeof(u32) * 8);
1730 if (rc < 0)
1731 goto bad;
1732 for (k = 0; k < 4; k++)
1733 c->u.node6.addr[k] = le32_to_cpu(buf[k]);
1734 for (k = 0; k < 4; k++)
1735 c->u.node6.mask[k] = le32_to_cpu(buf[k+4]);
1736 if (context_read_and_validate(&c->context[0], p, fp))
1737 goto bad;
1738 break;
1739 }
1740 }
1741 }
1742 }
1743
1744 rc = next_entry(buf, fp, sizeof(u32));
1745 if (rc < 0)
1746 goto bad;
1747 nel = le32_to_cpu(buf[0]);
1748 genfs_p = NULL;
1749 rc = -EINVAL;
1750 for (i = 0; i < nel; i++) {
1751 rc = next_entry(buf, fp, sizeof(u32));
1752 if (rc < 0)
1753 goto bad;
1754 len = le32_to_cpu(buf[0]);
1755 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
1756 if (!newgenfs) {
1757 rc = -ENOMEM;
1758 goto bad;
1759 }
1760
1761 newgenfs->fstype = kmalloc(len + 1,GFP_KERNEL);
1762 if (!newgenfs->fstype) {
1763 rc = -ENOMEM;
1764 kfree(newgenfs);
1765 goto bad;
1766 }
1767 rc = next_entry(newgenfs->fstype, fp, len);
1768 if (rc < 0) {
1769 kfree(newgenfs->fstype);
1770 kfree(newgenfs);
1771 goto bad;
1772 }
1773 newgenfs->fstype[len] = 0;
1774 for (genfs_p = NULL, genfs = p->genfs; genfs;
1775 genfs_p = genfs, genfs = genfs->next) {
1776 if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
1777 printk(KERN_ERR "security: dup genfs "
1778 "fstype %s\n", newgenfs->fstype);
1779 kfree(newgenfs->fstype);
1780 kfree(newgenfs);
1781 goto bad;
1782 }
1783 if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
1784 break;
1785 }
1786 newgenfs->next = genfs;
1787 if (genfs_p)
1788 genfs_p->next = newgenfs;
1789 else
1790 p->genfs = newgenfs;
1791 rc = next_entry(buf, fp, sizeof(u32));
1792 if (rc < 0)
1793 goto bad;
1794 nel2 = le32_to_cpu(buf[0]);
1795 for (j = 0; j < nel2; j++) {
1796 rc = next_entry(buf, fp, sizeof(u32));
1797 if (rc < 0)
1798 goto bad;
1799 len = le32_to_cpu(buf[0]);
1800
1801 newc = kzalloc(sizeof(*newc), GFP_KERNEL);
1802 if (!newc) {
1803 rc = -ENOMEM;
1804 goto bad;
1805 }
1806
1807 newc->u.name = kmalloc(len + 1,GFP_KERNEL);
1808 if (!newc->u.name) {
1809 rc = -ENOMEM;
1810 goto bad_newc;
1811 }
1812 rc = next_entry(newc->u.name, fp, len);
1813 if (rc < 0)
1814 goto bad_newc;
1815 newc->u.name[len] = 0;
1816 rc = next_entry(buf, fp, sizeof(u32));
1817 if (rc < 0)
1818 goto bad_newc;
1819 newc->v.sclass = le32_to_cpu(buf[0]);
1820 if (context_read_and_validate(&newc->context[0], p, fp))
1821 goto bad_newc;
1822 for (l = NULL, c = newgenfs->head; c;
1823 l = c, c = c->next) {
1824 if (!strcmp(newc->u.name, c->u.name) &&
1825 (!c->v.sclass || !newc->v.sclass ||
1826 newc->v.sclass == c->v.sclass)) {
1827 printk(KERN_ERR "security: dup genfs "
1828 "entry (%s,%s)\n",
1829 newgenfs->fstype, c->u.name);
1830 goto bad_newc;
1831 }
1832 len = strlen(newc->u.name);
1833 len2 = strlen(c->u.name);
1834 if (len > len2)
1835 break;
1836 }
1837
1838 newc->next = c;
1839 if (l)
1840 l->next = newc;
1841 else
1842 newgenfs->head = newc;
1843 }
1844 }
1845
1846 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1847 int new_rangetr = p->policyvers >= POLICYDB_VERSION_RANGETRANS;
1848 rc = next_entry(buf, fp, sizeof(u32));
1849 if (rc < 0)
1850 goto bad;
1851 nel = le32_to_cpu(buf[0]);
1852 lrt = NULL;
1853 for (i = 0; i < nel; i++) {
1854 rt = kzalloc(sizeof(*rt), GFP_KERNEL);
1855 if (!rt) {
1856 rc = -ENOMEM;
1857 goto bad;
1858 }
1859 if (lrt)
1860 lrt->next = rt;
1861 else
1862 p->range_tr = rt;
1863 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1864 if (rc < 0)
1865 goto bad;
1866 rt->source_type = le32_to_cpu(buf[0]);
1867 rt->target_type = le32_to_cpu(buf[1]);
1868 if (new_rangetr) {
1869 rc = next_entry(buf, fp, sizeof(u32));
1870 if (rc < 0)
1871 goto bad;
1872 rt->target_class = le32_to_cpu(buf[0]);
1873 } else
1874 rt->target_class = SECCLASS_PROCESS;
1875 rc = mls_read_range_helper(&rt->target_range, fp);
1876 if (rc)
1877 goto bad;
1878 lrt = rt;
1879 }
1880 }
1881
1882 p->type_attr_map = kmalloc(p->p_types.nprim*sizeof(struct ebitmap), GFP_KERNEL);
1883 if (!p->type_attr_map)
1884 goto bad;
1885
1886 for (i = 0; i < p->p_types.nprim; i++) {
1887 ebitmap_init(&p->type_attr_map[i]);
1888 if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
1889 if (ebitmap_read(&p->type_attr_map[i], fp))
1890 goto bad;
1891 }
1892 /* add the type itself as the degenerate case */
1893 if (ebitmap_set_bit(&p->type_attr_map[i], i, 1))
1894 goto bad;
1895 }
1896
1897 rc = 0;
1898 out:
1899 return rc;
1900 bad_newc:
1901 ocontext_destroy(newc,OCON_FSUSE);
1902 bad:
1903 if (!rc)
1904 rc = -EINVAL;
1905 policydb_destroy(p);
1906 goto out;
1907 }
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