projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
initrd: cast `initrd_start' to `void *'
[deliverable/linux.git] / security / selinux / ss / policydb.c
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;
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 .version = POLICYDB_VERSION_PERMISSIVE,
117 .sym_num = SYM_NUM,
118 .ocon_num = OCON_NUM,
119 }
120 };
121
122 static struct policydb_compat_info *policydb_lookup_compat(int version)
123 {
124 int i;
125 struct policydb_compat_info *info = NULL;
126
127 for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) {
128 if (policydb_compat[i].version == version) {
129 info = &policydb_compat[i];
130 break;
131 }
132 }
133 return info;
134 }
135
136 /*
137 * Initialize the role table.
138 */
139 static int roles_init(struct policydb *p)
140 {
141 char *key = NULL;
142 int rc;
143 struct role_datum *role;
144
145 role = kzalloc(sizeof(*role), GFP_KERNEL);
146 if (!role) {
147 rc = -ENOMEM;
148 goto out;
149 }
150 role->value = ++p->p_roles.nprim;
151 if (role->value != OBJECT_R_VAL) {
152 rc = -EINVAL;
153 goto out_free_role;
154 }
155 key = kmalloc(strlen(OBJECT_R)+1, GFP_KERNEL);
156 if (!key) {
157 rc = -ENOMEM;
158 goto out_free_role;
159 }
160 strcpy(key, OBJECT_R);
161 rc = hashtab_insert(p->p_roles.table, key, role);
162 if (rc)
163 goto out_free_key;
164 out:
165 return rc;
166
167 out_free_key:
168 kfree(key);
169 out_free_role:
170 kfree(role);
171 goto out;
172 }
173
174 /*
175 * Initialize a policy database structure.
176 */
177 static int policydb_init(struct policydb *p)
178 {
179 int i, rc;
180
181 memset(p, 0, sizeof(*p));
182
183 for (i = 0; i < SYM_NUM; i++) {
184 rc = symtab_init(&p->symtab[i], symtab_sizes[i]);
185 if (rc)
186 goto out_free_symtab;
187 }
188
189 rc = avtab_init(&p->te_avtab);
190 if (rc)
191 goto out_free_symtab;
192
193 rc = roles_init(p);
194 if (rc)
195 goto out_free_symtab;
196
197 rc = cond_policydb_init(p);
198 if (rc)
199 goto out_free_symtab;
200
201 ebitmap_init(&p->policycaps);
202 ebitmap_init(&p->permissive_map);
203
204 out:
205 return rc;
206
207 out_free_symtab:
208 for (i = 0; i < SYM_NUM; i++)
209 hashtab_destroy(p->symtab[i].table);
210 goto out;
211 }
212
213 /*
214 * The following *_index functions are used to
215 * define the val_to_name and val_to_struct arrays
216 * in a policy database structure. The val_to_name
217 * arrays are used when converting security context
218 * structures into string representations. The
219 * val_to_struct arrays are used when the attributes
220 * of a class, role, or user are needed.
221 */
222
223 static int common_index(void *key, void *datum, void *datap)
224 {
225 struct policydb *p;
226 struct common_datum *comdatum;
227
228 comdatum = datum;
229 p = datap;
230 if (!comdatum->value || comdatum->value > p->p_commons.nprim)
231 return -EINVAL;
232 p->p_common_val_to_name[comdatum->value - 1] = key;
233 return 0;
234 }
235
236 static int class_index(void *key, void *datum, void *datap)
237 {
238 struct policydb *p;
239 struct class_datum *cladatum;
240
241 cladatum = datum;
242 p = datap;
243 if (!cladatum->value || cladatum->value > p->p_classes.nprim)
244 return -EINVAL;
245 p->p_class_val_to_name[cladatum->value - 1] = key;
246 p->class_val_to_struct[cladatum->value - 1] = cladatum;
247 return 0;
248 }
249
250 static int role_index(void *key, void *datum, void *datap)
251 {
252 struct policydb *p;
253 struct role_datum *role;
254
255 role = datum;
256 p = datap;
257 if (!role->value || role->value > p->p_roles.nprim)
258 return -EINVAL;
259 p->p_role_val_to_name[role->value - 1] = key;
260 p->role_val_to_struct[role->value - 1] = role;
261 return 0;
262 }
263
264 static int type_index(void *key, void *datum, void *datap)
265 {
266 struct policydb *p;
267 struct type_datum *typdatum;
268
269 typdatum = datum;
270 p = datap;
271
272 if (typdatum->primary) {
273 if (!typdatum->value || typdatum->value > p->p_types.nprim)
274 return -EINVAL;
275 p->p_type_val_to_name[typdatum->value - 1] = key;
276 }
277
278 return 0;
279 }
280
281 static int user_index(void *key, void *datum, void *datap)
282 {
283 struct policydb *p;
284 struct user_datum *usrdatum;
285
286 usrdatum = datum;
287 p = datap;
288 if (!usrdatum->value || usrdatum->value > p->p_users.nprim)
289 return -EINVAL;
290 p->p_user_val_to_name[usrdatum->value - 1] = key;
291 p->user_val_to_struct[usrdatum->value - 1] = usrdatum;
292 return 0;
293 }
294
295 static int sens_index(void *key, void *datum, void *datap)
296 {
297 struct policydb *p;
298 struct level_datum *levdatum;
299
300 levdatum = datum;
301 p = datap;
302
303 if (!levdatum->isalias) {
304 if (!levdatum->level->sens ||
305 levdatum->level->sens > p->p_levels.nprim)
306 return -EINVAL;
307 p->p_sens_val_to_name[levdatum->level->sens - 1] = key;
308 }
309
310 return 0;
311 }
312
313 static int cat_index(void *key, void *datum, void *datap)
314 {
315 struct policydb *p;
316 struct cat_datum *catdatum;
317
318 catdatum = datum;
319 p = datap;
320
321 if (!catdatum->isalias) {
322 if (!catdatum->value || catdatum->value > p->p_cats.nprim)
323 return -EINVAL;
324 p->p_cat_val_to_name[catdatum->value - 1] = key;
325 }
326
327 return 0;
328 }
329
330 static int (*index_f[SYM_NUM]) (void *key, void *datum, void *datap) =
331 {
332 common_index,
333 class_index,
334 role_index,
335 type_index,
336 user_index,
337 cond_index_bool,
338 sens_index,
339 cat_index,
340 };
341
342 /*
343 * Define the common val_to_name array and the class
344 * val_to_name and val_to_struct arrays in a policy
345 * database structure.
346 *
347 * Caller must clean up upon failure.
348 */
349 static int policydb_index_classes(struct policydb *p)
350 {
351 int rc;
352
353 p->p_common_val_to_name =
354 kmalloc(p->p_commons.nprim * sizeof(char *), GFP_KERNEL);
355 if (!p->p_common_val_to_name) {
356 rc = -ENOMEM;
357 goto out;
358 }
359
360 rc = hashtab_map(p->p_commons.table, common_index, p);
361 if (rc)
362 goto out;
363
364 p->class_val_to_struct =
365 kmalloc(p->p_classes.nprim * sizeof(*(p->class_val_to_struct)), GFP_KERNEL);
366 if (!p->class_val_to_struct) {
367 rc = -ENOMEM;
368 goto out;
369 }
370
371 p->p_class_val_to_name =
372 kmalloc(p->p_classes.nprim * sizeof(char *), GFP_KERNEL);
373 if (!p->p_class_val_to_name) {
374 rc = -ENOMEM;
375 goto out;
376 }
377
378 rc = hashtab_map(p->p_classes.table, class_index, p);
379 out:
380 return rc;
381 }
382
383 #ifdef DEBUG_HASHES
384 static void symtab_hash_eval(struct symtab *s)
385 {
386 int i;
387
388 for (i = 0; i < SYM_NUM; i++) {
389 struct hashtab *h = s[i].table;
390 struct hashtab_info info;
391
392 hashtab_stat(h, &info);
393 printk(KERN_DEBUG "SELinux: %s: %d entries and %d/%d buckets used, "
394 "longest chain length %d\n", symtab_name[i], h->nel,
395 info.slots_used, h->size, info.max_chain_len);
396 }
397 }
398 #endif
399
400 /*
401 * Define the other val_to_name and val_to_struct arrays
402 * in a policy database structure.
403 *
404 * Caller must clean up on failure.
405 */
406 static int policydb_index_others(struct policydb *p)
407 {
408 int i, rc = 0;
409
410 printk(KERN_DEBUG "SELinux: %d users, %d roles, %d types, %d bools",
411 p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim, p->p_bools.nprim);
412 if (selinux_mls_enabled)
413 printk(", %d sens, %d cats", p->p_levels.nprim,
414 p->p_cats.nprim);
415 printk("\n");
416
417 printk(KERN_DEBUG "SELinux: %d classes, %d rules\n",
418 p->p_classes.nprim, p->te_avtab.nel);
419
420 #ifdef DEBUG_HASHES
421 avtab_hash_eval(&p->te_avtab, "rules");
422 symtab_hash_eval(p->symtab);
423 #endif
424
425 p->role_val_to_struct =
426 kmalloc(p->p_roles.nprim * sizeof(*(p->role_val_to_struct)),
427 GFP_KERNEL);
428 if (!p->role_val_to_struct) {
429 rc = -ENOMEM;
430 goto out;
431 }
432
433 p->user_val_to_struct =
434 kmalloc(p->p_users.nprim * sizeof(*(p->user_val_to_struct)),
435 GFP_KERNEL);
436 if (!p->user_val_to_struct) {
437 rc = -ENOMEM;
438 goto out;
439 }
440
441 if (cond_init_bool_indexes(p)) {
442 rc = -ENOMEM;
443 goto out;
444 }
445
446 for (i = SYM_ROLES; i < SYM_NUM; i++) {
447 p->sym_val_to_name[i] =
448 kmalloc(p->symtab[i].nprim * sizeof(char *), GFP_KERNEL);
449 if (!p->sym_val_to_name[i]) {
450 rc = -ENOMEM;
451 goto out;
452 }
453 rc = hashtab_map(p->symtab[i].table, index_f[i], p);
454 if (rc)
455 goto out;
456 }
457
458 out:
459 return rc;
460 }
461
462 /*
463 * The following *_destroy functions are used to
464 * free any memory allocated for each kind of
465 * symbol data in the policy database.
466 */
467
468 static int perm_destroy(void *key, void *datum, void *p)
469 {
470 kfree(key);
471 kfree(datum);
472 return 0;
473 }
474
475 static int common_destroy(void *key, void *datum, void *p)
476 {
477 struct common_datum *comdatum;
478
479 kfree(key);
480 comdatum = datum;
481 hashtab_map(comdatum->permissions.table, perm_destroy, NULL);
482 hashtab_destroy(comdatum->permissions.table);
483 kfree(datum);
484 return 0;
485 }
486
487 static int cls_destroy(void *key, void *datum, void *p)
488 {
489 struct class_datum *cladatum;
490 struct constraint_node *constraint, *ctemp;
491 struct constraint_expr *e, *etmp;
492
493 kfree(key);
494 cladatum = datum;
495 hashtab_map(cladatum->permissions.table, perm_destroy, NULL);
496 hashtab_destroy(cladatum->permissions.table);
497 constraint = cladatum->constraints;
498 while (constraint) {
499 e = constraint->expr;
500 while (e) {
501 ebitmap_destroy(&e->names);
502 etmp = e;
503 e = e->next;
504 kfree(etmp);
505 }
506 ctemp = constraint;
507 constraint = constraint->next;
508 kfree(ctemp);
509 }
510
511 constraint = cladatum->validatetrans;
512 while (constraint) {
513 e = constraint->expr;
514 while (e) {
515 ebitmap_destroy(&e->names);
516 etmp = e;
517 e = e->next;
518 kfree(etmp);
519 }
520 ctemp = constraint;
521 constraint = constraint->next;
522 kfree(ctemp);
523 }
524
525 kfree(cladatum->comkey);
526 kfree(datum);
527 return 0;
528 }
529
530 static int role_destroy(void *key, void *datum, void *p)
531 {
532 struct role_datum *role;
533
534 kfree(key);
535 role = datum;
536 ebitmap_destroy(&role->dominates);
537 ebitmap_destroy(&role->types);
538 kfree(datum);
539 return 0;
540 }
541
542 static int type_destroy(void *key, void *datum, void *p)
543 {
544 kfree(key);
545 kfree(datum);
546 return 0;
547 }
548
549 static int user_destroy(void *key, void *datum, void *p)
550 {
551 struct user_datum *usrdatum;
552
553 kfree(key);
554 usrdatum = datum;
555 ebitmap_destroy(&usrdatum->roles);
556 ebitmap_destroy(&usrdatum->range.level[0].cat);
557 ebitmap_destroy(&usrdatum->range.level[1].cat);
558 ebitmap_destroy(&usrdatum->dfltlevel.cat);
559 kfree(datum);
560 return 0;
561 }
562
563 static int sens_destroy(void *key, void *datum, void *p)
564 {
565 struct level_datum *levdatum;
566
567 kfree(key);
568 levdatum = datum;
569 ebitmap_destroy(&levdatum->level->cat);
570 kfree(levdatum->level);
571 kfree(datum);
572 return 0;
573 }
574
575 static int cat_destroy(void *key, void *datum, void *p)
576 {
577 kfree(key);
578 kfree(datum);
579 return 0;
580 }
581
582 static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) =
583 {
584 common_destroy,
585 cls_destroy,
586 role_destroy,
587 type_destroy,
588 user_destroy,
589 cond_destroy_bool,
590 sens_destroy,
591 cat_destroy,
592 };
593
594 static void ocontext_destroy(struct ocontext *c, int i)
595 {
596 context_destroy(&c->context[0]);
597 context_destroy(&c->context[1]);
598 if (i == OCON_ISID || i == OCON_FS ||
599 i == OCON_NETIF || i == OCON_FSUSE)
600 kfree(c->u.name);
601 kfree(c);
602 }
603
604 /*
605 * Free any memory allocated by a policy database structure.
606 */
607 void policydb_destroy(struct policydb *p)
608 {
609 struct ocontext *c, *ctmp;
610 struct genfs *g, *gtmp;
611 int i;
612 struct role_allow *ra, *lra = NULL;
613 struct role_trans *tr, *ltr = NULL;
614 struct range_trans *rt, *lrt = NULL;
615
616 for (i = 0; i < SYM_NUM; i++) {
617 cond_resched();
618 hashtab_map(p->symtab[i].table, destroy_f[i], NULL);
619 hashtab_destroy(p->symtab[i].table);
620 }
621
622 for (i = 0; i < SYM_NUM; i++)
623 kfree(p->sym_val_to_name[i]);
624
625 kfree(p->class_val_to_struct);
626 kfree(p->role_val_to_struct);
627 kfree(p->user_val_to_struct);
628
629 avtab_destroy(&p->te_avtab);
630
631 for (i = 0; i < OCON_NUM; i++) {
632 cond_resched();
633 c = p->ocontexts[i];
634 while (c) {
635 ctmp = c;
636 c = c->next;
637 ocontext_destroy(ctmp, i);
638 }
639 p->ocontexts[i] = NULL;
640 }
641
642 g = p->genfs;
643 while (g) {
644 cond_resched();
645 kfree(g->fstype);
646 c = g->head;
647 while (c) {
648 ctmp = c;
649 c = c->next;
650 ocontext_destroy(ctmp, OCON_FSUSE);
651 }
652 gtmp = g;
653 g = g->next;
654 kfree(gtmp);
655 }
656 p->genfs = NULL;
657
658 cond_policydb_destroy(p);
659
660 for (tr = p->role_tr; tr; tr = tr->next) {
661 cond_resched();
662 kfree(ltr);
663 ltr = tr;
664 }
665 kfree(ltr);
666
667 for (ra = p->role_allow; ra; ra = ra->next) {
668 cond_resched();
669 kfree(lra);
670 lra = ra;
671 }
672 kfree(lra);
673
674 for (rt = p->range_tr; rt; rt = rt->next) {
675 cond_resched();
676 if (lrt) {
677 ebitmap_destroy(&lrt->target_range.level[0].cat);
678 ebitmap_destroy(&lrt->target_range.level[1].cat);
679 kfree(lrt);
680 }
681 lrt = rt;
682 }
683 if (lrt) {
684 ebitmap_destroy(&lrt->target_range.level[0].cat);
685 ebitmap_destroy(&lrt->target_range.level[1].cat);
686 kfree(lrt);
687 }
688
689 if (p->type_attr_map) {
690 for (i = 0; i < p->p_types.nprim; i++)
691 ebitmap_destroy(&p->type_attr_map[i]);
692 }
693 kfree(p->type_attr_map);
694 kfree(p->undefined_perms);
695 ebitmap_destroy(&p->policycaps);
696 ebitmap_destroy(&p->permissive_map);
697
698 return;
699 }
700
701 /*
702 * Load the initial SIDs specified in a policy database
703 * structure into a SID table.
704 */
705 int policydb_load_isids(struct policydb *p, struct sidtab *s)
706 {
707 struct ocontext *head, *c;
708 int rc;
709
710 rc = sidtab_init(s);
711 if (rc) {
712 printk(KERN_ERR "SELinux: out of memory on SID table init\n");
713 goto out;
714 }
715
716 head = p->ocontexts[OCON_ISID];
717 for (c = head; c; c = c->next) {
718 if (!c->context[0].user) {
719 printk(KERN_ERR "SELinux: SID %s was never "
720 "defined.\n", c->u.name);
721 rc = -EINVAL;
722 goto out;
723 }
724 if (sidtab_insert(s, c->sid[0], &c->context[0])) {
725 printk(KERN_ERR "SELinux: unable to load initial "
726 "SID %s.\n", c->u.name);
727 rc = -EINVAL;
728 goto out;
729 }
730 }
731 out:
732 return rc;
733 }
734
735 int policydb_class_isvalid(struct policydb *p, unsigned int class)
736 {
737 if (!class || class > p->p_classes.nprim)
738 return 0;
739 return 1;
740 }
741
742 int policydb_role_isvalid(struct policydb *p, unsigned int role)
743 {
744 if (!role || role > p->p_roles.nprim)
745 return 0;
746 return 1;
747 }
748
749 int policydb_type_isvalid(struct policydb *p, unsigned int type)
750 {
751 if (!type || type > p->p_types.nprim)
752 return 0;
753 return 1;
754 }
755
756 /*
757 * Return 1 if the fields in the security context
758 * structure `c' are valid. Return 0 otherwise.
759 */
760 int policydb_context_isvalid(struct policydb *p, struct context *c)
761 {
762 struct role_datum *role;
763 struct user_datum *usrdatum;
764
765 if (!c->role || c->role > p->p_roles.nprim)
766 return 0;
767
768 if (!c->user || c->user > p->p_users.nprim)
769 return 0;
770
771 if (!c->type || c->type > p->p_types.nprim)
772 return 0;
773
774 if (c->role != OBJECT_R_VAL) {
775 /*
776 * Role must be authorized for the type.
777 */
778 role = p->role_val_to_struct[c->role - 1];
779 if (!ebitmap_get_bit(&role->types,
780 c->type - 1))
781 /* role may not be associated with type */
782 return 0;
783
784 /*
785 * User must be authorized for the role.
786 */
787 usrdatum = p->user_val_to_struct[c->user - 1];
788 if (!usrdatum)
789 return 0;
790
791 if (!ebitmap_get_bit(&usrdatum->roles,
792 c->role - 1))
793 /* user may not be associated with role */
794 return 0;
795 }
796
797 if (!mls_context_isvalid(p, c))
798 return 0;
799
800 return 1;
801 }
802
803 /*
804 * Read a MLS range structure from a policydb binary
805 * representation file.
806 */
807 static int mls_read_range_helper(struct mls_range *r, void *fp)
808 {
809 __le32 buf[2];
810 u32 items;
811 int rc;
812
813 rc = next_entry(buf, fp, sizeof(u32));
814 if (rc < 0)
815 goto out;
816
817 items = le32_to_cpu(buf[0]);
818 if (items > ARRAY_SIZE(buf)) {
819 printk(KERN_ERR "SELinux: mls: range overflow\n");
820 rc = -EINVAL;
821 goto out;
822 }
823 rc = next_entry(buf, fp, sizeof(u32) * items);
824 if (rc < 0) {
825 printk(KERN_ERR "SELinux: mls: truncated range\n");
826 goto out;
827 }
828 r->level[0].sens = le32_to_cpu(buf[0]);
829 if (items > 1)
830 r->level[1].sens = le32_to_cpu(buf[1]);
831 else
832 r->level[1].sens = r->level[0].sens;
833
834 rc = ebitmap_read(&r->level[0].cat, fp);
835 if (rc) {
836 printk(KERN_ERR "SELinux: mls: error reading low "
837 "categories\n");
838 goto out;
839 }
840 if (items > 1) {
841 rc = ebitmap_read(&r->level[1].cat, fp);
842 if (rc) {
843 printk(KERN_ERR "SELinux: mls: error reading high "
844 "categories\n");
845 goto bad_high;
846 }
847 } else {
848 rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat);
849 if (rc) {
850 printk(KERN_ERR "SELinux: mls: out of memory\n");
851 goto bad_high;
852 }
853 }
854
855 rc = 0;
856 out:
857 return rc;
858 bad_high:
859 ebitmap_destroy(&r->level[0].cat);
860 goto out;
861 }
862
863 /*
864 * Read and validate a security context structure
865 * from a policydb binary representation file.
866 */
867 static int context_read_and_validate(struct context *c,
868 struct policydb *p,
869 void *fp)
870 {
871 __le32 buf[3];
872 int rc;
873
874 rc = next_entry(buf, fp, sizeof buf);
875 if (rc < 0) {
876 printk(KERN_ERR "SELinux: context truncated\n");
877 goto out;
878 }
879 c->user = le32_to_cpu(buf[0]);
880 c->role = le32_to_cpu(buf[1]);
881 c->type = le32_to_cpu(buf[2]);
882 if (p->policyvers >= POLICYDB_VERSION_MLS) {
883 if (mls_read_range_helper(&c->range, fp)) {
884 printk(KERN_ERR "SELinux: error reading MLS range of "
885 "context\n");
886 rc = -EINVAL;
887 goto out;
888 }
889 }
890
891 if (!policydb_context_isvalid(p, c)) {
892 printk(KERN_ERR "SELinux: invalid security context\n");
893 context_destroy(c);
894 rc = -EINVAL;
895 }
896 out:
897 return rc;
898 }
899
900 /*
901 * The following *_read functions are used to
902 * read the symbol data from a policy database
903 * binary representation file.
904 */
905
906 static int perm_read(struct policydb *p, struct hashtab *h, void *fp)
907 {
908 char *key = NULL;
909 struct perm_datum *perdatum;
910 int rc;
911 __le32 buf[2];
912 u32 len;
913
914 perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
915 if (!perdatum) {
916 rc = -ENOMEM;
917 goto out;
918 }
919
920 rc = next_entry(buf, fp, sizeof buf);
921 if (rc < 0)
922 goto bad;
923
924 len = le32_to_cpu(buf[0]);
925 perdatum->value = le32_to_cpu(buf[1]);
926
927 key = kmalloc(len + 1, GFP_KERNEL);
928 if (!key) {
929 rc = -ENOMEM;
930 goto bad;
931 }
932 rc = next_entry(key, fp, len);
933 if (rc < 0)
934 goto bad;
935 key[len] = 0;
936
937 rc = hashtab_insert(h, key, perdatum);
938 if (rc)
939 goto bad;
940 out:
941 return rc;
942 bad:
943 perm_destroy(key, perdatum, NULL);
944 goto out;
945 }
946
947 static int common_read(struct policydb *p, struct hashtab *h, void *fp)
948 {
949 char *key = NULL;
950 struct common_datum *comdatum;
951 __le32 buf[4];
952 u32 len, nel;
953 int i, rc;
954
955 comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
956 if (!comdatum) {
957 rc = -ENOMEM;
958 goto out;
959 }
960
961 rc = next_entry(buf, fp, sizeof buf);
962 if (rc < 0)
963 goto bad;
964
965 len = le32_to_cpu(buf[0]);
966 comdatum->value = le32_to_cpu(buf[1]);
967
968 rc = symtab_init(&comdatum->permissions, PERM_SYMTAB_SIZE);
969 if (rc)
970 goto bad;
971 comdatum->permissions.nprim = le32_to_cpu(buf[2]);
972 nel = le32_to_cpu(buf[3]);
973
974 key = kmalloc(len + 1, GFP_KERNEL);
975 if (!key) {
976 rc = -ENOMEM;
977 goto bad;
978 }
979 rc = next_entry(key, fp, len);
980 if (rc < 0)
981 goto bad;
982 key[len] = 0;
983
984 for (i = 0; i < nel; i++) {
985 rc = perm_read(p, comdatum->permissions.table, fp);
986 if (rc)
987 goto bad;
988 }
989
990 rc = hashtab_insert(h, key, comdatum);
991 if (rc)
992 goto bad;
993 out:
994 return rc;
995 bad:
996 common_destroy(key, comdatum, NULL);
997 goto out;
998 }
999
1000 static int read_cons_helper(struct constraint_node **nodep, int ncons,
1001 int allowxtarget, void *fp)
1002 {
1003 struct constraint_node *c, *lc;
1004 struct constraint_expr *e, *le;
1005 __le32 buf[3];
1006 u32 nexpr;
1007 int rc, i, j, depth;
1008
1009 lc = NULL;
1010 for (i = 0; i < ncons; i++) {
1011 c = kzalloc(sizeof(*c), GFP_KERNEL);
1012 if (!c)
1013 return -ENOMEM;
1014
1015 if (lc)
1016 lc->next = c;
1017 else
1018 *nodep = c;
1019
1020 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1021 if (rc < 0)
1022 return rc;
1023 c->permissions = le32_to_cpu(buf[0]);
1024 nexpr = le32_to_cpu(buf[1]);
1025 le = NULL;
1026 depth = -1;
1027 for (j = 0; j < nexpr; j++) {
1028 e = kzalloc(sizeof(*e), GFP_KERNEL);
1029 if (!e)
1030 return -ENOMEM;
1031
1032 if (le)
1033 le->next = e;
1034 else
1035 c->expr = e;
1036
1037 rc = next_entry(buf, fp, (sizeof(u32) * 3));
1038 if (rc < 0)
1039 return rc;
1040 e->expr_type = le32_to_cpu(buf[0]);
1041 e->attr = le32_to_cpu(buf[1]);
1042 e->op = le32_to_cpu(buf[2]);
1043
1044 switch (e->expr_type) {
1045 case CEXPR_NOT:
1046 if (depth < 0)
1047 return -EINVAL;
1048 break;
1049 case CEXPR_AND:
1050 case CEXPR_OR:
1051 if (depth < 1)
1052 return -EINVAL;
1053 depth--;
1054 break;
1055 case CEXPR_ATTR:
1056 if (depth == (CEXPR_MAXDEPTH - 1))
1057 return -EINVAL;
1058 depth++;
1059 break;
1060 case CEXPR_NAMES:
1061 if (!allowxtarget && (e->attr & CEXPR_XTARGET))
1062 return -EINVAL;
1063 if (depth == (CEXPR_MAXDEPTH - 1))
1064 return -EINVAL;
1065 depth++;
1066 if (ebitmap_read(&e->names, fp))
1067 return -EINVAL;
1068 break;
1069 default:
1070 return -EINVAL;
1071 }
1072 le = e;
1073 }
1074 if (depth != 0)
1075 return -EINVAL;
1076 lc = c;
1077 }
1078
1079 return 0;
1080 }
1081
1082 static int class_read(struct policydb *p, struct hashtab *h, void *fp)
1083 {
1084 char *key = NULL;
1085 struct class_datum *cladatum;
1086 __le32 buf[6];
1087 u32 len, len2, ncons, nel;
1088 int i, rc;
1089
1090 cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
1091 if (!cladatum) {
1092 rc = -ENOMEM;
1093 goto out;
1094 }
1095
1096 rc = next_entry(buf, fp, sizeof(u32)*6);
1097 if (rc < 0)
1098 goto bad;
1099
1100 len = le32_to_cpu(buf[0]);
1101 len2 = le32_to_cpu(buf[1]);
1102 cladatum->value = le32_to_cpu(buf[2]);
1103
1104 rc = symtab_init(&cladatum->permissions, PERM_SYMTAB_SIZE);
1105 if (rc)
1106 goto bad;
1107 cladatum->permissions.nprim = le32_to_cpu(buf[3]);
1108 nel = le32_to_cpu(buf[4]);
1109
1110 ncons = le32_to_cpu(buf[5]);
1111
1112 key = kmalloc(len + 1, GFP_KERNEL);
1113 if (!key) {
1114 rc = -ENOMEM;
1115 goto bad;
1116 }
1117 rc = next_entry(key, fp, len);
1118 if (rc < 0)
1119 goto bad;
1120 key[len] = 0;
1121
1122 if (len2) {
1123 cladatum->comkey = kmalloc(len2 + 1, GFP_KERNEL);
1124 if (!cladatum->comkey) {
1125 rc = -ENOMEM;
1126 goto bad;
1127 }
1128 rc = next_entry(cladatum->comkey, fp, len2);
1129 if (rc < 0)
1130 goto bad;
1131 cladatum->comkey[len2] = 0;
1132
1133 cladatum->comdatum = hashtab_search(p->p_commons.table,
1134 cladatum->comkey);
1135 if (!cladatum->comdatum) {
1136 printk(KERN_ERR "SELinux: unknown common %s\n",
1137 cladatum->comkey);
1138 rc = -EINVAL;
1139 goto bad;
1140 }
1141 }
1142 for (i = 0; i < nel; i++) {
1143 rc = perm_read(p, cladatum->permissions.table, fp);
1144 if (rc)
1145 goto bad;
1146 }
1147
1148 rc = read_cons_helper(&cladatum->constraints, ncons, 0, fp);
1149 if (rc)
1150 goto bad;
1151
1152 if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
1153 /* grab the validatetrans rules */
1154 rc = next_entry(buf, fp, sizeof(u32));
1155 if (rc < 0)
1156 goto bad;
1157 ncons = le32_to_cpu(buf[0]);
1158 rc = read_cons_helper(&cladatum->validatetrans, ncons, 1, fp);
1159 if (rc)
1160 goto bad;
1161 }
1162
1163 rc = hashtab_insert(h, key, cladatum);
1164 if (rc)
1165 goto bad;
1166
1167 rc = 0;
1168 out:
1169 return rc;
1170 bad:
1171 cls_destroy(key, cladatum, NULL);
1172 goto out;
1173 }
1174
1175 static int role_read(struct policydb *p, struct hashtab *h, void *fp)
1176 {
1177 char *key = NULL;
1178 struct role_datum *role;
1179 int rc;
1180 __le32 buf[2];
1181 u32 len;
1182
1183 role = kzalloc(sizeof(*role), GFP_KERNEL);
1184 if (!role) {
1185 rc = -ENOMEM;
1186 goto out;
1187 }
1188
1189 rc = next_entry(buf, fp, sizeof buf);
1190 if (rc < 0)
1191 goto bad;
1192
1193 len = le32_to_cpu(buf[0]);
1194 role->value = le32_to_cpu(buf[1]);
1195
1196 key = kmalloc(len + 1, GFP_KERNEL);
1197 if (!key) {
1198 rc = -ENOMEM;
1199 goto bad;
1200 }
1201 rc = next_entry(key, fp, len);
1202 if (rc < 0)
1203 goto bad;
1204 key[len] = 0;
1205
1206 rc = ebitmap_read(&role->dominates, fp);
1207 if (rc)
1208 goto bad;
1209
1210 rc = ebitmap_read(&role->types, fp);
1211 if (rc)
1212 goto bad;
1213
1214 if (strcmp(key, OBJECT_R) == 0) {
1215 if (role->value != OBJECT_R_VAL) {
1216 printk(KERN_ERR "SELinux: Role %s has wrong value %d\n",
1217 OBJECT_R, role->value);
1218 rc = -EINVAL;
1219 goto bad;
1220 }
1221 rc = 0;
1222 goto bad;
1223 }
1224
1225 rc = hashtab_insert(h, key, role);
1226 if (rc)
1227 goto bad;
1228 out:
1229 return rc;
1230 bad:
1231 role_destroy(key, role, NULL);
1232 goto out;
1233 }
1234
1235 static int type_read(struct policydb *p, struct hashtab *h, void *fp)
1236 {
1237 char *key = NULL;
1238 struct type_datum *typdatum;
1239 int rc;
1240 __le32 buf[3];
1241 u32 len;
1242
1243 typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL);
1244 if (!typdatum) {
1245 rc = -ENOMEM;
1246 return rc;
1247 }
1248
1249 rc = next_entry(buf, fp, sizeof buf);
1250 if (rc < 0)
1251 goto bad;
1252
1253 len = le32_to_cpu(buf[0]);
1254 typdatum->value = le32_to_cpu(buf[1]);
1255 typdatum->primary = le32_to_cpu(buf[2]);
1256
1257 key = kmalloc(len + 1, GFP_KERNEL);
1258 if (!key) {
1259 rc = -ENOMEM;
1260 goto bad;
1261 }
1262 rc = next_entry(key, fp, len);
1263 if (rc < 0)
1264 goto bad;
1265 key[len] = 0;
1266
1267 rc = hashtab_insert(h, key, typdatum);
1268 if (rc)
1269 goto bad;
1270 out:
1271 return rc;
1272 bad:
1273 type_destroy(key, typdatum, NULL);
1274 goto out;
1275 }
1276
1277
1278 /*
1279 * Read a MLS level structure from a policydb binary
1280 * representation file.
1281 */
1282 static int mls_read_level(struct mls_level *lp, void *fp)
1283 {
1284 __le32 buf[1];
1285 int rc;
1286
1287 memset(lp, 0, sizeof(*lp));
1288
1289 rc = next_entry(buf, fp, sizeof buf);
1290 if (rc < 0) {
1291 printk(KERN_ERR "SELinux: mls: truncated level\n");
1292 goto bad;
1293 }
1294 lp->sens = le32_to_cpu(buf[0]);
1295
1296 if (ebitmap_read(&lp->cat, fp)) {
1297 printk(KERN_ERR "SELinux: mls: error reading level "
1298 "categories\n");
1299 goto bad;
1300 }
1301
1302 return 0;
1303
1304 bad:
1305 return -EINVAL;
1306 }
1307
1308 static int user_read(struct policydb *p, struct hashtab *h, void *fp)
1309 {
1310 char *key = NULL;
1311 struct user_datum *usrdatum;
1312 int rc;
1313 __le32 buf[2];
1314 u32 len;
1315
1316 usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
1317 if (!usrdatum) {
1318 rc = -ENOMEM;
1319 goto out;
1320 }
1321
1322 rc = next_entry(buf, fp, sizeof buf);
1323 if (rc < 0)
1324 goto bad;
1325
1326 len = le32_to_cpu(buf[0]);
1327 usrdatum->value = le32_to_cpu(buf[1]);
1328
1329 key = kmalloc(len + 1, GFP_KERNEL);
1330 if (!key) {
1331 rc = -ENOMEM;
1332 goto bad;
1333 }
1334 rc = next_entry(key, fp, len);
1335 if (rc < 0)
1336 goto bad;
1337 key[len] = 0;
1338
1339 rc = ebitmap_read(&usrdatum->roles, fp);
1340 if (rc)
1341 goto bad;
1342
1343 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1344 rc = mls_read_range_helper(&usrdatum->range, fp);
1345 if (rc)
1346 goto bad;
1347 rc = mls_read_level(&usrdatum->dfltlevel, fp);
1348 if (rc)
1349 goto bad;
1350 }
1351
1352 rc = hashtab_insert(h, key, usrdatum);
1353 if (rc)
1354 goto bad;
1355 out:
1356 return rc;
1357 bad:
1358 user_destroy(key, usrdatum, NULL);
1359 goto out;
1360 }
1361
1362 static int sens_read(struct policydb *p, struct hashtab *h, void *fp)
1363 {
1364 char *key = NULL;
1365 struct level_datum *levdatum;
1366 int rc;
1367 __le32 buf[2];
1368 u32 len;
1369
1370 levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC);
1371 if (!levdatum) {
1372 rc = -ENOMEM;
1373 goto out;
1374 }
1375
1376 rc = next_entry(buf, fp, sizeof buf);
1377 if (rc < 0)
1378 goto bad;
1379
1380 len = le32_to_cpu(buf[0]);
1381 levdatum->isalias = le32_to_cpu(buf[1]);
1382
1383 key = kmalloc(len + 1, GFP_ATOMIC);
1384 if (!key) {
1385 rc = -ENOMEM;
1386 goto bad;
1387 }
1388 rc = next_entry(key, fp, len);
1389 if (rc < 0)
1390 goto bad;
1391 key[len] = 0;
1392
1393 levdatum->level = kmalloc(sizeof(struct mls_level), GFP_ATOMIC);
1394 if (!levdatum->level) {
1395 rc = -ENOMEM;
1396 goto bad;
1397 }
1398 if (mls_read_level(levdatum->level, fp)) {
1399 rc = -EINVAL;
1400 goto bad;
1401 }
1402
1403 rc = hashtab_insert(h, key, levdatum);
1404 if (rc)
1405 goto bad;
1406 out:
1407 return rc;
1408 bad:
1409 sens_destroy(key, levdatum, NULL);
1410 goto out;
1411 }
1412
1413 static int cat_read(struct policydb *p, struct hashtab *h, void *fp)
1414 {
1415 char *key = NULL;
1416 struct cat_datum *catdatum;
1417 int rc;
1418 __le32 buf[3];
1419 u32 len;
1420
1421 catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC);
1422 if (!catdatum) {
1423 rc = -ENOMEM;
1424 goto out;
1425 }
1426
1427 rc = next_entry(buf, fp, sizeof buf);
1428 if (rc < 0)
1429 goto bad;
1430
1431 len = le32_to_cpu(buf[0]);
1432 catdatum->value = le32_to_cpu(buf[1]);
1433 catdatum->isalias = le32_to_cpu(buf[2]);
1434
1435 key = kmalloc(len + 1, GFP_ATOMIC);
1436 if (!key) {
1437 rc = -ENOMEM;
1438 goto bad;
1439 }
1440 rc = next_entry(key, fp, len);
1441 if (rc < 0)
1442 goto bad;
1443 key[len] = 0;
1444
1445 rc = hashtab_insert(h, key, catdatum);
1446 if (rc)
1447 goto bad;
1448 out:
1449 return rc;
1450
1451 bad:
1452 cat_destroy(key, catdatum, NULL);
1453 goto out;
1454 }
1455
1456 static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, void *fp) =
1457 {
1458 common_read,
1459 class_read,
1460 role_read,
1461 type_read,
1462 user_read,
1463 cond_read_bool,
1464 sens_read,
1465 cat_read,
1466 };
1467
1468 extern int ss_initialized;
1469
1470 /*
1471 * Read the configuration data from a policy database binary
1472 * representation file into a policy database structure.
1473 */
1474 int policydb_read(struct policydb *p, void *fp)
1475 {
1476 struct role_allow *ra, *lra;
1477 struct role_trans *tr, *ltr;
1478 struct ocontext *l, *c, *newc;
1479 struct genfs *genfs_p, *genfs, *newgenfs;
1480 int i, j, rc;
1481 __le32 buf[4];
1482 u32 nodebuf[8];
1483 u32 len, len2, config, nprim, nel, nel2;
1484 char *policydb_str;
1485 struct policydb_compat_info *info;
1486 struct range_trans *rt, *lrt;
1487
1488 config = 0;
1489
1490 rc = policydb_init(p);
1491 if (rc)
1492 goto out;
1493
1494 /* Read the magic number and string length. */
1495 rc = next_entry(buf, fp, sizeof(u32) * 2);
1496 if (rc < 0)
1497 goto bad;
1498
1499 if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
1500 printk(KERN_ERR "SELinux: policydb magic number 0x%x does "
1501 "not match expected magic number 0x%x\n",
1502 le32_to_cpu(buf[0]), POLICYDB_MAGIC);
1503 goto bad;
1504 }
1505
1506 len = le32_to_cpu(buf[1]);
1507 if (len != strlen(POLICYDB_STRING)) {
1508 printk(KERN_ERR "SELinux: policydb string length %d does not "
1509 "match expected length %Zu\n",
1510 len, strlen(POLICYDB_STRING));
1511 goto bad;
1512 }
1513 policydb_str = kmalloc(len + 1, GFP_KERNEL);
1514 if (!policydb_str) {
1515 printk(KERN_ERR "SELinux: unable to allocate memory for policydb "
1516 "string of length %d\n", len);
1517 rc = -ENOMEM;
1518 goto bad;
1519 }
1520 rc = next_entry(policydb_str, fp, len);
1521 if (rc < 0) {
1522 printk(KERN_ERR "SELinux: truncated policydb string identifier\n");
1523 kfree(policydb_str);
1524 goto bad;
1525 }
1526 policydb_str[len] = 0;
1527 if (strcmp(policydb_str, POLICYDB_STRING)) {
1528 printk(KERN_ERR "SELinux: policydb string %s does not match "
1529 "my string %s\n", policydb_str, POLICYDB_STRING);
1530 kfree(policydb_str);
1531 goto bad;
1532 }
1533 /* Done with policydb_str. */
1534 kfree(policydb_str);
1535 policydb_str = NULL;
1536
1537 /* Read the version, config, and table sizes. */
1538 rc = next_entry(buf, fp, sizeof(u32)*4);
1539 if (rc < 0)
1540 goto bad;
1541
1542 p->policyvers = le32_to_cpu(buf[0]);
1543 if (p->policyvers < POLICYDB_VERSION_MIN ||
1544 p->policyvers > POLICYDB_VERSION_MAX) {
1545 printk(KERN_ERR "SELinux: policydb version %d does not match "
1546 "my version range %d-%d\n",
1547 le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
1548 goto bad;
1549 }
1550
1551 if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
1552 if (ss_initialized && !selinux_mls_enabled) {
1553 printk(KERN_ERR "SELinux: Cannot switch between non-MLS"
1554 " and MLS policies\n");
1555 goto bad;
1556 }
1557 selinux_mls_enabled = 1;
1558 config |= POLICYDB_CONFIG_MLS;
1559
1560 if (p->policyvers < POLICYDB_VERSION_MLS) {
1561 printk(KERN_ERR "SELinux: security policydb version %d "
1562 "(MLS) not backwards compatible\n",
1563 p->policyvers);
1564 goto bad;
1565 }
1566 } else {
1567 if (ss_initialized && selinux_mls_enabled) {
1568 printk(KERN_ERR "SELinux: Cannot switch between MLS and"
1569 " non-MLS policies\n");
1570 goto bad;
1571 }
1572 }
1573 p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
1574 p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
1575
1576 if (p->policyvers >= POLICYDB_VERSION_POLCAP &&
1577 ebitmap_read(&p->policycaps, fp) != 0)
1578 goto bad;
1579
1580 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE &&
1581 ebitmap_read(&p->permissive_map, fp) != 0)
1582 goto bad;
1583
1584 info = policydb_lookup_compat(p->policyvers);
1585 if (!info) {
1586 printk(KERN_ERR "SELinux: unable to find policy compat info "
1587 "for version %d\n", p->policyvers);
1588 goto bad;
1589 }
1590
1591 if (le32_to_cpu(buf[2]) != info->sym_num ||
1592 le32_to_cpu(buf[3]) != info->ocon_num) {
1593 printk(KERN_ERR "SELinux: policydb table sizes (%d,%d) do "
1594 "not match mine (%d,%d)\n", le32_to_cpu(buf[2]),
1595 le32_to_cpu(buf[3]),
1596 info->sym_num, info->ocon_num);
1597 goto bad;
1598 }
1599
1600 for (i = 0; i < info->sym_num; i++) {
1601 rc = next_entry(buf, fp, sizeof(u32)*2);
1602 if (rc < 0)
1603 goto bad;
1604 nprim = le32_to_cpu(buf[0]);
1605 nel = le32_to_cpu(buf[1]);
1606 for (j = 0; j < nel; j++) {
1607 rc = read_f[i](p, p->symtab[i].table, fp);
1608 if (rc)
1609 goto bad;
1610 }
1611
1612 p->symtab[i].nprim = nprim;
1613 }
1614
1615 rc = avtab_read(&p->te_avtab, fp, p);
1616 if (rc)
1617 goto bad;
1618
1619 if (p->policyvers >= POLICYDB_VERSION_BOOL) {
1620 rc = cond_read_list(p, fp);
1621 if (rc)
1622 goto bad;
1623 }
1624
1625 rc = next_entry(buf, fp, sizeof(u32));
1626 if (rc < 0)
1627 goto bad;
1628 nel = le32_to_cpu(buf[0]);
1629 ltr = NULL;
1630 for (i = 0; i < nel; i++) {
1631 tr = kzalloc(sizeof(*tr), GFP_KERNEL);
1632 if (!tr) {
1633 rc = -ENOMEM;
1634 goto bad;
1635 }
1636 if (ltr)
1637 ltr->next = tr;
1638 else
1639 p->role_tr = tr;
1640 rc = next_entry(buf, fp, sizeof(u32)*3);
1641 if (rc < 0)
1642 goto bad;
1643 tr->role = le32_to_cpu(buf[0]);
1644 tr->type = le32_to_cpu(buf[1]);
1645 tr->new_role = le32_to_cpu(buf[2]);
1646 if (!policydb_role_isvalid(p, tr->role) ||
1647 !policydb_type_isvalid(p, tr->type) ||
1648 !policydb_role_isvalid(p, tr->new_role)) {
1649 rc = -EINVAL;
1650 goto bad;
1651 }
1652 ltr = tr;
1653 }
1654
1655 rc = next_entry(buf, fp, sizeof(u32));
1656 if (rc < 0)
1657 goto bad;
1658 nel = le32_to_cpu(buf[0]);
1659 lra = NULL;
1660 for (i = 0; i < nel; i++) {
1661 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
1662 if (!ra) {
1663 rc = -ENOMEM;
1664 goto bad;
1665 }
1666 if (lra)
1667 lra->next = ra;
1668 else
1669 p->role_allow = ra;
1670 rc = next_entry(buf, fp, sizeof(u32)*2);
1671 if (rc < 0)
1672 goto bad;
1673 ra->role = le32_to_cpu(buf[0]);
1674 ra->new_role = le32_to_cpu(buf[1]);
1675 if (!policydb_role_isvalid(p, ra->role) ||
1676 !policydb_role_isvalid(p, ra->new_role)) {
1677 rc = -EINVAL;
1678 goto bad;
1679 }
1680 lra = ra;
1681 }
1682
1683 rc = policydb_index_classes(p);
1684 if (rc)
1685 goto bad;
1686
1687 rc = policydb_index_others(p);
1688 if (rc)
1689 goto bad;
1690
1691 for (i = 0; i < info->ocon_num; i++) {
1692 rc = next_entry(buf, fp, sizeof(u32));
1693 if (rc < 0)
1694 goto bad;
1695 nel = le32_to_cpu(buf[0]);
1696 l = NULL;
1697 for (j = 0; j < nel; j++) {
1698 c = kzalloc(sizeof(*c), GFP_KERNEL);
1699 if (!c) {
1700 rc = -ENOMEM;
1701 goto bad;
1702 }
1703 if (l)
1704 l->next = c;
1705 else
1706 p->ocontexts[i] = c;
1707 l = c;
1708 rc = -EINVAL;
1709 switch (i) {
1710 case OCON_ISID:
1711 rc = next_entry(buf, fp, sizeof(u32));
1712 if (rc < 0)
1713 goto bad;
1714 c->sid[0] = le32_to_cpu(buf[0]);
1715 rc = context_read_and_validate(&c->context[0], p, fp);
1716 if (rc)
1717 goto bad;
1718 break;
1719 case OCON_FS:
1720 case OCON_NETIF:
1721 rc = next_entry(buf, fp, sizeof(u32));
1722 if (rc < 0)
1723 goto bad;
1724 len = le32_to_cpu(buf[0]);
1725 c->u.name = kmalloc(len + 1, GFP_KERNEL);
1726 if (!c->u.name) {
1727 rc = -ENOMEM;
1728 goto bad;
1729 }
1730 rc = next_entry(c->u.name, fp, len);
1731 if (rc < 0)
1732 goto bad;
1733 c->u.name[len] = 0;
1734 rc = context_read_and_validate(&c->context[0], p, fp);
1735 if (rc)
1736 goto bad;
1737 rc = context_read_and_validate(&c->context[1], p, fp);
1738 if (rc)
1739 goto bad;
1740 break;
1741 case OCON_PORT:
1742 rc = next_entry(buf, fp, sizeof(u32)*3);
1743 if (rc < 0)
1744 goto bad;
1745 c->u.port.protocol = le32_to_cpu(buf[0]);
1746 c->u.port.low_port = le32_to_cpu(buf[1]);
1747 c->u.port.high_port = le32_to_cpu(buf[2]);
1748 rc = context_read_and_validate(&c->context[0], p, fp);
1749 if (rc)
1750 goto bad;
1751 break;
1752 case OCON_NODE:
1753 rc = next_entry(nodebuf, fp, sizeof(u32) * 2);
1754 if (rc < 0)
1755 goto bad;
1756 c->u.node.addr = nodebuf[0]; /* network order */
1757 c->u.node.mask = nodebuf[1]; /* network order */
1758 rc = context_read_and_validate(&c->context[0], p, fp);
1759 if (rc)
1760 goto bad;
1761 break;
1762 case OCON_FSUSE:
1763 rc = next_entry(buf, fp, sizeof(u32)*2);
1764 if (rc < 0)
1765 goto bad;
1766 c->v.behavior = le32_to_cpu(buf[0]);
1767 if (c->v.behavior > SECURITY_FS_USE_NONE)
1768 goto bad;
1769 len = le32_to_cpu(buf[1]);
1770 c->u.name = kmalloc(len + 1, GFP_KERNEL);
1771 if (!c->u.name) {
1772 rc = -ENOMEM;
1773 goto bad;
1774 }
1775 rc = next_entry(c->u.name, fp, len);
1776 if (rc < 0)
1777 goto bad;
1778 c->u.name[len] = 0;
1779 rc = context_read_and_validate(&c->context[0], p, fp);
1780 if (rc)
1781 goto bad;
1782 break;
1783 case OCON_NODE6: {
1784 int k;
1785
1786 rc = next_entry(nodebuf, fp, sizeof(u32) * 8);
1787 if (rc < 0)
1788 goto bad;
1789 for (k = 0; k < 4; k++)
1790 c->u.node6.addr[k] = nodebuf[k];
1791 for (k = 0; k < 4; k++)
1792 c->u.node6.mask[k] = nodebuf[k+4];
1793 if (context_read_and_validate(&c->context[0], p, fp))
1794 goto bad;
1795 break;
1796 }
1797 }
1798 }
1799 }
1800
1801 rc = next_entry(buf, fp, sizeof(u32));
1802 if (rc < 0)
1803 goto bad;
1804 nel = le32_to_cpu(buf[0]);
1805 genfs_p = NULL;
1806 rc = -EINVAL;
1807 for (i = 0; i < nel; i++) {
1808 rc = next_entry(buf, fp, sizeof(u32));
1809 if (rc < 0)
1810 goto bad;
1811 len = le32_to_cpu(buf[0]);
1812 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
1813 if (!newgenfs) {
1814 rc = -ENOMEM;
1815 goto bad;
1816 }
1817
1818 newgenfs->fstype = kmalloc(len + 1, GFP_KERNEL);
1819 if (!newgenfs->fstype) {
1820 rc = -ENOMEM;
1821 kfree(newgenfs);
1822 goto bad;
1823 }
1824 rc = next_entry(newgenfs->fstype, fp, len);
1825 if (rc < 0) {
1826 kfree(newgenfs->fstype);
1827 kfree(newgenfs);
1828 goto bad;
1829 }
1830 newgenfs->fstype[len] = 0;
1831 for (genfs_p = NULL, genfs = p->genfs; genfs;
1832 genfs_p = genfs, genfs = genfs->next) {
1833 if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
1834 printk(KERN_ERR "SELinux: dup genfs "
1835 "fstype %s\n", newgenfs->fstype);
1836 kfree(newgenfs->fstype);
1837 kfree(newgenfs);
1838 goto bad;
1839 }
1840 if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
1841 break;
1842 }
1843 newgenfs->next = genfs;
1844 if (genfs_p)
1845 genfs_p->next = newgenfs;
1846 else
1847 p->genfs = newgenfs;
1848 rc = next_entry(buf, fp, sizeof(u32));
1849 if (rc < 0)
1850 goto bad;
1851 nel2 = le32_to_cpu(buf[0]);
1852 for (j = 0; j < nel2; j++) {
1853 rc = next_entry(buf, fp, sizeof(u32));
1854 if (rc < 0)
1855 goto bad;
1856 len = le32_to_cpu(buf[0]);
1857
1858 newc = kzalloc(sizeof(*newc), GFP_KERNEL);
1859 if (!newc) {
1860 rc = -ENOMEM;
1861 goto bad;
1862 }
1863
1864 newc->u.name = kmalloc(len + 1, GFP_KERNEL);
1865 if (!newc->u.name) {
1866 rc = -ENOMEM;
1867 goto bad_newc;
1868 }
1869 rc = next_entry(newc->u.name, fp, len);
1870 if (rc < 0)
1871 goto bad_newc;
1872 newc->u.name[len] = 0;
1873 rc = next_entry(buf, fp, sizeof(u32));
1874 if (rc < 0)
1875 goto bad_newc;
1876 newc->v.sclass = le32_to_cpu(buf[0]);
1877 if (context_read_and_validate(&newc->context[0], p, fp))
1878 goto bad_newc;
1879 for (l = NULL, c = newgenfs->head; c;
1880 l = c, c = c->next) {
1881 if (!strcmp(newc->u.name, c->u.name) &&
1882 (!c->v.sclass || !newc->v.sclass ||
1883 newc->v.sclass == c->v.sclass)) {
1884 printk(KERN_ERR "SELinux: dup genfs "
1885 "entry (%s,%s)\n",
1886 newgenfs->fstype, c->u.name);
1887 goto bad_newc;
1888 }
1889 len = strlen(newc->u.name);
1890 len2 = strlen(c->u.name);
1891 if (len > len2)
1892 break;
1893 }
1894
1895 newc->next = c;
1896 if (l)
1897 l->next = newc;
1898 else
1899 newgenfs->head = newc;
1900 }
1901 }
1902
1903 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1904 int new_rangetr = p->policyvers >= POLICYDB_VERSION_RANGETRANS;
1905 rc = next_entry(buf, fp, sizeof(u32));
1906 if (rc < 0)
1907 goto bad;
1908 nel = le32_to_cpu(buf[0]);
1909 lrt = NULL;
1910 for (i = 0; i < nel; i++) {
1911 rt = kzalloc(sizeof(*rt), GFP_KERNEL);
1912 if (!rt) {
1913 rc = -ENOMEM;
1914 goto bad;
1915 }
1916 if (lrt)
1917 lrt->next = rt;
1918 else
1919 p->range_tr = rt;
1920 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1921 if (rc < 0)
1922 goto bad;
1923 rt->source_type = le32_to_cpu(buf[0]);
1924 rt->target_type = le32_to_cpu(buf[1]);
1925 if (new_rangetr) {
1926 rc = next_entry(buf, fp, sizeof(u32));
1927 if (rc < 0)
1928 goto bad;
1929 rt->target_class = le32_to_cpu(buf[0]);
1930 } else
1931 rt->target_class = SECCLASS_PROCESS;
1932 if (!policydb_type_isvalid(p, rt->source_type) ||
1933 !policydb_type_isvalid(p, rt->target_type) ||
1934 !policydb_class_isvalid(p, rt->target_class)) {
1935 rc = -EINVAL;
1936 goto bad;
1937 }
1938 rc = mls_read_range_helper(&rt->target_range, fp);
1939 if (rc)
1940 goto bad;
1941 if (!mls_range_isvalid(p, &rt->target_range)) {
1942 printk(KERN_WARNING "SELinux: rangetrans: invalid range\n");
1943 goto bad;
1944 }
1945 lrt = rt;
1946 }
1947 }
1948
1949 p->type_attr_map = kmalloc(p->p_types.nprim*sizeof(struct ebitmap), GFP_KERNEL);
1950 if (!p->type_attr_map)
1951 goto bad;
1952
1953 for (i = 0; i < p->p_types.nprim; i++) {
1954 ebitmap_init(&p->type_attr_map[i]);
1955 if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
1956 if (ebitmap_read(&p->type_attr_map[i], fp))
1957 goto bad;
1958 }
1959 /* add the type itself as the degenerate case */
1960 if (ebitmap_set_bit(&p->type_attr_map[i], i, 1))
1961 goto bad;
1962 }
1963
1964 rc = 0;
1965 out:
1966 return rc;
1967 bad_newc:
1968 ocontext_destroy(newc, OCON_FSUSE);
1969 bad:
1970 if (!rc)
1971 rc = -EINVAL;
1972 policydb_destroy(p);
1973 goto out;
1974 }
Linux kernel - Deliverables
This page took 0.075133 seconds and 5 git commands to generate.