Loading...
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Implementation of the policy database.
4 *
5 * Author : Stephen Smalley, <stephen.smalley.work@gmail.com>
6 */
7
8/*
9 * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
10 * Support for enhanced MLS infrastructure.
11 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
12 *
13 * Updated: Frank Mayer <mayerf@tresys.com> and
14 * Karl MacMillan <kmacmillan@tresys.com>
15 * Added conditional policy language extensions
16 * Copyright (C) 2003-2004 Tresys Technology, LLC
17 *
18 * Updated: Hewlett-Packard <paul@paul-moore.com>
19 * Added support for the policy capability bitmap
20 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
21 *
22 * Update: Mellanox Techonologies
23 * Added Infiniband support
24 * Copyright (C) 2016 Mellanox Techonologies
25 */
26
27#include <linux/kernel.h>
28#include <linux/sched.h>
29#include <linux/slab.h>
30#include <linux/string.h>
31#include <linux/errno.h>
32#include <linux/audit.h>
33#include "security.h"
34
35#include "policydb.h"
36#include "conditional.h"
37#include "mls.h"
38#include "services.h"
39
40#ifdef CONFIG_SECURITY_SELINUX_DEBUG
41/* clang-format off */
42static const char *const symtab_name[SYM_NUM] = {
43 "common prefixes",
44 "classes",
45 "roles",
46 "types",
47 "users",
48 "bools",
49 "levels",
50 "categories",
51};
52/* clang-format off */
53#endif
54
55struct policydb_compat_info {
56 unsigned int version;
57 unsigned int sym_num;
58 unsigned int ocon_num;
59};
60
61/* These need to be updated if SYM_NUM or OCON_NUM changes */
62static const struct policydb_compat_info policydb_compat[] = {
63 {
64 .version = POLICYDB_VERSION_BASE,
65 .sym_num = SYM_NUM - 3,
66 .ocon_num = OCON_NUM - 3,
67 },
68 {
69 .version = POLICYDB_VERSION_BOOL,
70 .sym_num = SYM_NUM - 2,
71 .ocon_num = OCON_NUM - 3,
72 },
73 {
74 .version = POLICYDB_VERSION_IPV6,
75 .sym_num = SYM_NUM - 2,
76 .ocon_num = OCON_NUM - 2,
77 },
78 {
79 .version = POLICYDB_VERSION_NLCLASS,
80 .sym_num = SYM_NUM - 2,
81 .ocon_num = OCON_NUM - 2,
82 },
83 {
84 .version = POLICYDB_VERSION_MLS,
85 .sym_num = SYM_NUM,
86 .ocon_num = OCON_NUM - 2,
87 },
88 {
89 .version = POLICYDB_VERSION_AVTAB,
90 .sym_num = SYM_NUM,
91 .ocon_num = OCON_NUM - 2,
92 },
93 {
94 .version = POLICYDB_VERSION_RANGETRANS,
95 .sym_num = SYM_NUM,
96 .ocon_num = OCON_NUM - 2,
97 },
98 {
99 .version = POLICYDB_VERSION_POLCAP,
100 .sym_num = SYM_NUM,
101 .ocon_num = OCON_NUM - 2,
102 },
103 {
104 .version = POLICYDB_VERSION_PERMISSIVE,
105 .sym_num = SYM_NUM,
106 .ocon_num = OCON_NUM - 2,
107 },
108 {
109 .version = POLICYDB_VERSION_BOUNDARY,
110 .sym_num = SYM_NUM,
111 .ocon_num = OCON_NUM - 2,
112 },
113 {
114 .version = POLICYDB_VERSION_FILENAME_TRANS,
115 .sym_num = SYM_NUM,
116 .ocon_num = OCON_NUM - 2,
117 },
118 {
119 .version = POLICYDB_VERSION_ROLETRANS,
120 .sym_num = SYM_NUM,
121 .ocon_num = OCON_NUM - 2,
122 },
123 {
124 .version = POLICYDB_VERSION_NEW_OBJECT_DEFAULTS,
125 .sym_num = SYM_NUM,
126 .ocon_num = OCON_NUM - 2,
127 },
128 {
129 .version = POLICYDB_VERSION_DEFAULT_TYPE,
130 .sym_num = SYM_NUM,
131 .ocon_num = OCON_NUM - 2,
132 },
133 {
134 .version = POLICYDB_VERSION_CONSTRAINT_NAMES,
135 .sym_num = SYM_NUM,
136 .ocon_num = OCON_NUM - 2,
137 },
138 {
139 .version = POLICYDB_VERSION_XPERMS_IOCTL,
140 .sym_num = SYM_NUM,
141 .ocon_num = OCON_NUM - 2,
142 },
143 {
144 .version = POLICYDB_VERSION_INFINIBAND,
145 .sym_num = SYM_NUM,
146 .ocon_num = OCON_NUM,
147 },
148 {
149 .version = POLICYDB_VERSION_GLBLUB,
150 .sym_num = SYM_NUM,
151 .ocon_num = OCON_NUM,
152 },
153 {
154 .version = POLICYDB_VERSION_COMP_FTRANS,
155 .sym_num = SYM_NUM,
156 .ocon_num = OCON_NUM,
157 },
158};
159
160static const struct policydb_compat_info *
161policydb_lookup_compat(unsigned int version)
162{
163 unsigned int i;
164
165 for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) {
166 if (policydb_compat[i].version == version)
167 return &policydb_compat[i];
168 }
169
170 return NULL;
171}
172
173/*
174 * The following *_destroy functions are used to
175 * free any memory allocated for each kind of
176 * symbol data in the policy database.
177 */
178
179static int perm_destroy(void *key, void *datum, void *p)
180{
181 kfree(key);
182 kfree(datum);
183 return 0;
184}
185
186static int common_destroy(void *key, void *datum, void *p)
187{
188 struct common_datum *comdatum;
189
190 kfree(key);
191 if (datum) {
192 comdatum = datum;
193 hashtab_map(&comdatum->permissions.table, perm_destroy, NULL);
194 hashtab_destroy(&comdatum->permissions.table);
195 }
196 kfree(datum);
197 return 0;
198}
199
200static void constraint_expr_destroy(struct constraint_expr *expr)
201{
202 if (expr) {
203 ebitmap_destroy(&expr->names);
204 if (expr->type_names) {
205 ebitmap_destroy(&expr->type_names->types);
206 ebitmap_destroy(&expr->type_names->negset);
207 kfree(expr->type_names);
208 }
209 kfree(expr);
210 }
211}
212
213static int cls_destroy(void *key, void *datum, void *p)
214{
215 struct class_datum *cladatum;
216 struct constraint_node *constraint, *ctemp;
217 struct constraint_expr *e, *etmp;
218
219 kfree(key);
220 if (datum) {
221 cladatum = datum;
222 hashtab_map(&cladatum->permissions.table, perm_destroy, NULL);
223 hashtab_destroy(&cladatum->permissions.table);
224 constraint = cladatum->constraints;
225 while (constraint) {
226 e = constraint->expr;
227 while (e) {
228 etmp = e;
229 e = e->next;
230 constraint_expr_destroy(etmp);
231 }
232 ctemp = constraint;
233 constraint = constraint->next;
234 kfree(ctemp);
235 }
236
237 constraint = cladatum->validatetrans;
238 while (constraint) {
239 e = constraint->expr;
240 while (e) {
241 etmp = e;
242 e = e->next;
243 constraint_expr_destroy(etmp);
244 }
245 ctemp = constraint;
246 constraint = constraint->next;
247 kfree(ctemp);
248 }
249 kfree(cladatum->comkey);
250 }
251 kfree(datum);
252 return 0;
253}
254
255static int role_destroy(void *key, void *datum, void *p)
256{
257 struct role_datum *role;
258
259 kfree(key);
260 if (datum) {
261 role = datum;
262 ebitmap_destroy(&role->dominates);
263 ebitmap_destroy(&role->types);
264 }
265 kfree(datum);
266 return 0;
267}
268
269static int type_destroy(void *key, void *datum, void *p)
270{
271 kfree(key);
272 kfree(datum);
273 return 0;
274}
275
276static int user_destroy(void *key, void *datum, void *p)
277{
278 struct user_datum *usrdatum;
279
280 kfree(key);
281 if (datum) {
282 usrdatum = datum;
283 ebitmap_destroy(&usrdatum->roles);
284 ebitmap_destroy(&usrdatum->range.level[0].cat);
285 ebitmap_destroy(&usrdatum->range.level[1].cat);
286 ebitmap_destroy(&usrdatum->dfltlevel.cat);
287 }
288 kfree(datum);
289 return 0;
290}
291
292static int sens_destroy(void *key, void *datum, void *p)
293{
294 struct level_datum *levdatum;
295
296 kfree(key);
297 if (datum) {
298 levdatum = datum;
299 if (levdatum->level)
300 ebitmap_destroy(&levdatum->level->cat);
301 kfree(levdatum->level);
302 }
303 kfree(datum);
304 return 0;
305}
306
307static int cat_destroy(void *key, void *datum, void *p)
308{
309 kfree(key);
310 kfree(datum);
311 return 0;
312}
313
314/* clang-format off */
315static int (*const destroy_f[SYM_NUM])(void *key, void *datum, void *datap) = {
316 common_destroy,
317 cls_destroy,
318 role_destroy,
319 type_destroy,
320 user_destroy,
321 cond_destroy_bool,
322 sens_destroy,
323 cat_destroy,
324};
325/* clang-format on */
326
327static int filenametr_destroy(void *key, void *datum, void *p)
328{
329 struct filename_trans_key *ft = key;
330 struct filename_trans_datum *next, *d = datum;
331
332 kfree(ft->name);
333 kfree(key);
334 do {
335 ebitmap_destroy(&d->stypes);
336 next = d->next;
337 kfree(d);
338 d = next;
339 } while (unlikely(d));
340 cond_resched();
341 return 0;
342}
343
344static int range_tr_destroy(void *key, void *datum, void *p)
345{
346 struct mls_range *rt = datum;
347
348 kfree(key);
349 ebitmap_destroy(&rt->level[0].cat);
350 ebitmap_destroy(&rt->level[1].cat);
351 kfree(datum);
352 cond_resched();
353 return 0;
354}
355
356static int role_tr_destroy(void *key, void *datum, void *p)
357{
358 kfree(key);
359 kfree(datum);
360 return 0;
361}
362
363static void ocontext_destroy(struct ocontext *c, unsigned int i)
364{
365 if (!c)
366 return;
367
368 context_destroy(&c->context[0]);
369 context_destroy(&c->context[1]);
370 if (i == OCON_ISID || i == OCON_FS || i == OCON_NETIF ||
371 i == OCON_FSUSE)
372 kfree(c->u.name);
373 kfree(c);
374}
375
376/*
377 * Initialize the role table.
378 */
379static int roles_init(struct policydb *p)
380{
381 char *key = NULL;
382 int rc;
383 struct role_datum *role;
384
385 role = kzalloc(sizeof(*role), GFP_KERNEL);
386 if (!role)
387 return -ENOMEM;
388
389 rc = -EINVAL;
390 role->value = ++p->p_roles.nprim;
391 if (role->value != OBJECT_R_VAL)
392 goto out;
393
394 rc = -ENOMEM;
395 key = kstrdup(OBJECT_R, GFP_KERNEL);
396 if (!key)
397 goto out;
398
399 rc = symtab_insert(&p->p_roles, key, role);
400 if (rc)
401 goto out;
402
403 return 0;
404out:
405 kfree(key);
406 kfree(role);
407 return rc;
408}
409
410static u32 filenametr_hash(const void *k)
411{
412 const struct filename_trans_key *ft = k;
413 unsigned long salt = ft->ttype ^ ft->tclass;
414
415 return full_name_hash((void *)salt, ft->name, strlen(ft->name));
416}
417
418static int filenametr_cmp(const void *k1, const void *k2)
419{
420 const struct filename_trans_key *ft1 = k1;
421 const struct filename_trans_key *ft2 = k2;
422 int v;
423
424 v = ft1->ttype - ft2->ttype;
425 if (v)
426 return v;
427
428 v = ft1->tclass - ft2->tclass;
429 if (v)
430 return v;
431
432 return strcmp(ft1->name, ft2->name);
433}
434
435static const struct hashtab_key_params filenametr_key_params = {
436 .hash = filenametr_hash,
437 .cmp = filenametr_cmp,
438};
439
440struct filename_trans_datum *
441policydb_filenametr_search(struct policydb *p, struct filename_trans_key *key)
442{
443 return hashtab_search(&p->filename_trans, key, filenametr_key_params);
444}
445
446static u32 rangetr_hash(const void *k)
447{
448 const struct range_trans *key = k;
449
450 return key->source_type + (key->target_type << 3) +
451 (key->target_class << 5);
452}
453
454static int rangetr_cmp(const void *k1, const void *k2)
455{
456 const struct range_trans *key1 = k1, *key2 = k2;
457 int v;
458
459 v = key1->source_type - key2->source_type;
460 if (v)
461 return v;
462
463 v = key1->target_type - key2->target_type;
464 if (v)
465 return v;
466
467 v = key1->target_class - key2->target_class;
468
469 return v;
470}
471
472static const struct hashtab_key_params rangetr_key_params = {
473 .hash = rangetr_hash,
474 .cmp = rangetr_cmp,
475};
476
477struct mls_range *policydb_rangetr_search(struct policydb *p,
478 struct range_trans *key)
479{
480 return hashtab_search(&p->range_tr, key, rangetr_key_params);
481}
482
483static u32 role_trans_hash(const void *k)
484{
485 const struct role_trans_key *key = k;
486
487 return jhash_3words(key->role, key->type,
488 (u32)key->tclass << 16 | key->tclass, 0);
489}
490
491static int role_trans_cmp(const void *k1, const void *k2)
492{
493 const struct role_trans_key *key1 = k1, *key2 = k2;
494 int v;
495
496 v = key1->role - key2->role;
497 if (v)
498 return v;
499
500 v = key1->type - key2->type;
501 if (v)
502 return v;
503
504 return key1->tclass - key2->tclass;
505}
506
507static const struct hashtab_key_params roletr_key_params = {
508 .hash = role_trans_hash,
509 .cmp = role_trans_cmp,
510};
511
512struct role_trans_datum *policydb_roletr_search(struct policydb *p,
513 struct role_trans_key *key)
514{
515 return hashtab_search(&p->role_tr, key, roletr_key_params);
516}
517
518/*
519 * Initialize a policy database structure.
520 */
521static void policydb_init(struct policydb *p)
522{
523 memset(p, 0, sizeof(*p));
524
525 avtab_init(&p->te_avtab);
526 cond_policydb_init(p);
527
528 ebitmap_init(&p->filename_trans_ttypes);
529 ebitmap_init(&p->policycaps);
530 ebitmap_init(&p->permissive_map);
531}
532
533/*
534 * The following *_index functions are used to
535 * define the val_to_name and val_to_struct arrays
536 * in a policy database structure. The val_to_name
537 * arrays are used when converting security context
538 * structures into string representations. The
539 * val_to_struct arrays are used when the attributes
540 * of a class, role, or user are needed.
541 */
542
543static int common_index(void *key, void *datum, void *datap)
544{
545 struct policydb *p;
546 struct common_datum *comdatum;
547
548 comdatum = datum;
549 p = datap;
550 if (!comdatum->value || comdatum->value > p->p_commons.nprim)
551 return -EINVAL;
552
553 p->sym_val_to_name[SYM_COMMONS][comdatum->value - 1] = key;
554
555 return 0;
556}
557
558static int class_index(void *key, void *datum, void *datap)
559{
560 struct policydb *p;
561 struct class_datum *cladatum;
562
563 cladatum = datum;
564 p = datap;
565 if (!cladatum->value || cladatum->value > p->p_classes.nprim)
566 return -EINVAL;
567
568 p->sym_val_to_name[SYM_CLASSES][cladatum->value - 1] = key;
569 p->class_val_to_struct[cladatum->value - 1] = cladatum;
570 return 0;
571}
572
573static int role_index(void *key, void *datum, void *datap)
574{
575 struct policydb *p;
576 struct role_datum *role;
577
578 role = datum;
579 p = datap;
580 if (!role->value || role->value > p->p_roles.nprim ||
581 role->bounds > p->p_roles.nprim)
582 return -EINVAL;
583
584 p->sym_val_to_name[SYM_ROLES][role->value - 1] = key;
585 p->role_val_to_struct[role->value - 1] = role;
586 return 0;
587}
588
589static int type_index(void *key, void *datum, void *datap)
590{
591 struct policydb *p;
592 struct type_datum *typdatum;
593
594 typdatum = datum;
595 p = datap;
596
597 if (typdatum->primary) {
598 if (!typdatum->value || typdatum->value > p->p_types.nprim ||
599 typdatum->bounds > p->p_types.nprim)
600 return -EINVAL;
601 p->sym_val_to_name[SYM_TYPES][typdatum->value - 1] = key;
602 p->type_val_to_struct[typdatum->value - 1] = typdatum;
603 }
604
605 return 0;
606}
607
608static int user_index(void *key, void *datum, void *datap)
609{
610 struct policydb *p;
611 struct user_datum *usrdatum;
612
613 usrdatum = datum;
614 p = datap;
615 if (!usrdatum->value || usrdatum->value > p->p_users.nprim ||
616 usrdatum->bounds > p->p_users.nprim)
617 return -EINVAL;
618
619 p->sym_val_to_name[SYM_USERS][usrdatum->value - 1] = key;
620 p->user_val_to_struct[usrdatum->value - 1] = usrdatum;
621 return 0;
622}
623
624static int sens_index(void *key, void *datum, void *datap)
625{
626 struct policydb *p;
627 struct level_datum *levdatum;
628
629 levdatum = datum;
630 p = datap;
631
632 if (!levdatum->isalias) {
633 if (!levdatum->level->sens ||
634 levdatum->level->sens > p->p_levels.nprim)
635 return -EINVAL;
636
637 p->sym_val_to_name[SYM_LEVELS][levdatum->level->sens - 1] = key;
638 }
639
640 return 0;
641}
642
643static int cat_index(void *key, void *datum, void *datap)
644{
645 struct policydb *p;
646 struct cat_datum *catdatum;
647
648 catdatum = datum;
649 p = datap;
650
651 if (!catdatum->isalias) {
652 if (!catdatum->value || catdatum->value > p->p_cats.nprim)
653 return -EINVAL;
654
655 p->sym_val_to_name[SYM_CATS][catdatum->value - 1] = key;
656 }
657
658 return 0;
659}
660
661/* clang-format off */
662static int (*const index_f[SYM_NUM])(void *key, void *datum, void *datap) = {
663 common_index,
664 class_index,
665 role_index,
666 type_index,
667 user_index,
668 cond_index_bool,
669 sens_index,
670 cat_index,
671};
672/* clang-format on */
673
674#ifdef CONFIG_SECURITY_SELINUX_DEBUG
675static void hash_eval(struct hashtab *h, const char *hash_name,
676 const char *hash_details)
677{
678 struct hashtab_info info;
679
680 hashtab_stat(h, &info);
681 pr_debug(
682 "SELinux: %s%s%s: %d entries and %d/%d buckets used, longest chain length %d, sum of chain length^2 %llu\n",
683 hash_name, hash_details ? "@" : "", hash_details ?: "", h->nel,
684 info.slots_used, h->size, info.max_chain_len,
685 info.chain2_len_sum);
686}
687
688static void symtab_hash_eval(struct symtab *s)
689{
690 int i;
691
692 for (i = 0; i < SYM_NUM; i++)
693 hash_eval(&s[i].table, symtab_name[i], NULL);
694}
695
696#else
697static inline void hash_eval(struct hashtab *h, const char *hash_name,
698 const char *hash_details)
699{
700}
701static inline void symtab_hash_eval(struct symtab *s)
702{
703}
704#endif /* CONFIG_SECURITY_SELINUX_DEBUG */
705
706/*
707 * Define the other val_to_name and val_to_struct arrays
708 * in a policy database structure.
709 *
710 * Caller must clean up on failure.
711 */
712static int policydb_index(struct policydb *p)
713{
714 int i, rc;
715
716 if (p->mls_enabled)
717 pr_debug(
718 "SELinux: %d users, %d roles, %d types, %d bools, %d sens, %d cats\n",
719 p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim,
720 p->p_bools.nprim, p->p_levels.nprim, p->p_cats.nprim);
721 else
722 pr_debug("SELinux: %d users, %d roles, %d types, %d bools\n",
723 p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim,
724 p->p_bools.nprim);
725
726 pr_debug("SELinux: %d classes, %d rules\n", p->p_classes.nprim,
727 p->te_avtab.nel);
728
729 avtab_hash_eval(&p->te_avtab, "rules");
730 symtab_hash_eval(p->symtab);
731
732 p->class_val_to_struct = kcalloc(p->p_classes.nprim,
733 sizeof(*p->class_val_to_struct),
734 GFP_KERNEL);
735 if (!p->class_val_to_struct)
736 return -ENOMEM;
737
738 p->role_val_to_struct = kcalloc(
739 p->p_roles.nprim, sizeof(*p->role_val_to_struct), GFP_KERNEL);
740 if (!p->role_val_to_struct)
741 return -ENOMEM;
742
743 p->user_val_to_struct = kcalloc(
744 p->p_users.nprim, sizeof(*p->user_val_to_struct), GFP_KERNEL);
745 if (!p->user_val_to_struct)
746 return -ENOMEM;
747
748 p->type_val_to_struct = kvcalloc(
749 p->p_types.nprim, sizeof(*p->type_val_to_struct), GFP_KERNEL);
750 if (!p->type_val_to_struct)
751 return -ENOMEM;
752
753 rc = cond_init_bool_indexes(p);
754 if (rc)
755 goto out;
756
757 for (i = 0; i < SYM_NUM; i++) {
758 p->sym_val_to_name[i] = kvcalloc(p->symtab[i].nprim,
759 sizeof(char *), GFP_KERNEL);
760 if (!p->sym_val_to_name[i])
761 return -ENOMEM;
762
763 rc = hashtab_map(&p->symtab[i].table, index_f[i], p);
764 if (rc)
765 goto out;
766 }
767 rc = 0;
768out:
769 return rc;
770}
771
772/*
773 * Free any memory allocated by a policy database structure.
774 */
775void policydb_destroy(struct policydb *p)
776{
777 struct ocontext *c, *ctmp;
778 struct genfs *g, *gtmp;
779 u32 i;
780 struct role_allow *ra, *lra = NULL;
781
782 for (i = 0; i < SYM_NUM; i++) {
783 cond_resched();
784 hashtab_map(&p->symtab[i].table, destroy_f[i], NULL);
785 hashtab_destroy(&p->symtab[i].table);
786 }
787
788 for (i = 0; i < SYM_NUM; i++)
789 kvfree(p->sym_val_to_name[i]);
790
791 kfree(p->class_val_to_struct);
792 kfree(p->role_val_to_struct);
793 kfree(p->user_val_to_struct);
794 kvfree(p->type_val_to_struct);
795
796 avtab_destroy(&p->te_avtab);
797
798 for (i = 0; i < OCON_NUM; i++) {
799 cond_resched();
800 c = p->ocontexts[i];
801 while (c) {
802 ctmp = c;
803 c = c->next;
804 ocontext_destroy(ctmp, i);
805 }
806 p->ocontexts[i] = NULL;
807 }
808
809 g = p->genfs;
810 while (g) {
811 cond_resched();
812 kfree(g->fstype);
813 c = g->head;
814 while (c) {
815 ctmp = c;
816 c = c->next;
817 ocontext_destroy(ctmp, OCON_FSUSE);
818 }
819 gtmp = g;
820 g = g->next;
821 kfree(gtmp);
822 }
823 p->genfs = NULL;
824
825 cond_policydb_destroy(p);
826
827 hashtab_map(&p->role_tr, role_tr_destroy, NULL);
828 hashtab_destroy(&p->role_tr);
829
830 for (ra = p->role_allow; ra; ra = ra->next) {
831 cond_resched();
832 kfree(lra);
833 lra = ra;
834 }
835 kfree(lra);
836
837 hashtab_map(&p->filename_trans, filenametr_destroy, NULL);
838 hashtab_destroy(&p->filename_trans);
839
840 hashtab_map(&p->range_tr, range_tr_destroy, NULL);
841 hashtab_destroy(&p->range_tr);
842
843 if (p->type_attr_map_array) {
844 for (i = 0; i < p->p_types.nprim; i++)
845 ebitmap_destroy(&p->type_attr_map_array[i]);
846 kvfree(p->type_attr_map_array);
847 }
848
849 ebitmap_destroy(&p->filename_trans_ttypes);
850 ebitmap_destroy(&p->policycaps);
851 ebitmap_destroy(&p->permissive_map);
852}
853
854/*
855 * Load the initial SIDs specified in a policy database
856 * structure into a SID table.
857 */
858int policydb_load_isids(struct policydb *p, struct sidtab *s)
859{
860 struct ocontext *head, *c;
861 bool isid_init;
862 int rc;
863
864 rc = sidtab_init(s);
865 if (rc) {
866 pr_err("SELinux: out of memory on SID table init\n");
867 return rc;
868 }
869
870 isid_init = ebitmap_get_bit(&p->policycaps,
871 POLICYDB_CAP_USERSPACE_INITIAL_CONTEXT);
872
873 head = p->ocontexts[OCON_ISID];
874 for (c = head; c; c = c->next) {
875 u32 sid = c->sid[0];
876 const char *name = security_get_initial_sid_context(sid);
877
878 if (sid == SECSID_NULL) {
879 pr_err("SELinux: SID 0 was assigned a context.\n");
880 sidtab_destroy(s);
881 return -EINVAL;
882 }
883
884 /* Ignore initial SIDs unused by this kernel. */
885 if (!name)
886 continue;
887
888 /*
889 * Also ignore SECINITSID_INIT if the policy doesn't declare
890 * support for it
891 */
892 if (sid == SECINITSID_INIT && !isid_init)
893 continue;
894
895 rc = sidtab_set_initial(s, sid, &c->context[0]);
896 if (rc) {
897 pr_err("SELinux: unable to load initial SID %s.\n",
898 name);
899 sidtab_destroy(s);
900 return rc;
901 }
902
903 /*
904 * If the policy doesn't support the "userspace_initial_context"
905 * capability, set SECINITSID_INIT to the same context as
906 * SECINITSID_KERNEL. This ensures the same behavior as before
907 * the reintroduction of SECINITSID_INIT, where all tasks
908 * started before policy load would initially get the context
909 * corresponding to SECINITSID_KERNEL.
910 */
911 if (sid == SECINITSID_KERNEL && !isid_init) {
912 rc = sidtab_set_initial(s, SECINITSID_INIT,
913 &c->context[0]);
914 if (rc) {
915 pr_err("SELinux: unable to load initial SID %s.\n",
916 name);
917 sidtab_destroy(s);
918 return rc;
919 }
920 }
921 }
922 return 0;
923}
924
925int policydb_class_isvalid(struct policydb *p, unsigned int class)
926{
927 if (!class || class > p->p_classes.nprim)
928 return 0;
929 return 1;
930}
931
932int policydb_role_isvalid(struct policydb *p, unsigned int role)
933{
934 if (!role || role > p->p_roles.nprim)
935 return 0;
936 return 1;
937}
938
939int policydb_type_isvalid(struct policydb *p, unsigned int type)
940{
941 if (!type || type > p->p_types.nprim)
942 return 0;
943 return 1;
944}
945
946/*
947 * Return 1 if the fields in the security context
948 * structure `c' are valid. Return 0 otherwise.
949 */
950int policydb_context_isvalid(struct policydb *p, struct context *c)
951{
952 struct role_datum *role;
953 struct user_datum *usrdatum;
954
955 if (!c->role || c->role > p->p_roles.nprim)
956 return 0;
957
958 if (!c->user || c->user > p->p_users.nprim)
959 return 0;
960
961 if (!c->type || c->type > p->p_types.nprim)
962 return 0;
963
964 if (c->role != OBJECT_R_VAL) {
965 /*
966 * Role must be authorized for the type.
967 */
968 role = p->role_val_to_struct[c->role - 1];
969 if (!role || !ebitmap_get_bit(&role->types, c->type - 1))
970 /* role may not be associated with type */
971 return 0;
972
973 /*
974 * User must be authorized for the role.
975 */
976 usrdatum = p->user_val_to_struct[c->user - 1];
977 if (!usrdatum)
978 return 0;
979
980 if (!ebitmap_get_bit(&usrdatum->roles, c->role - 1))
981 /* user may not be associated with role */
982 return 0;
983 }
984
985 if (!mls_context_isvalid(p, c))
986 return 0;
987
988 return 1;
989}
990
991/*
992 * Read a MLS range structure from a policydb binary
993 * representation file.
994 */
995static int mls_read_range_helper(struct mls_range *r, void *fp)
996{
997 __le32 buf[2];
998 u32 items;
999 int rc;
1000
1001 rc = next_entry(buf, fp, sizeof(u32));
1002 if (rc)
1003 goto out;
1004
1005 rc = -EINVAL;
1006 items = le32_to_cpu(buf[0]);
1007 if (items > ARRAY_SIZE(buf)) {
1008 pr_err("SELinux: mls: range overflow\n");
1009 goto out;
1010 }
1011
1012 rc = next_entry(buf, fp, sizeof(u32) * items);
1013 if (rc) {
1014 pr_err("SELinux: mls: truncated range\n");
1015 goto out;
1016 }
1017
1018 r->level[0].sens = le32_to_cpu(buf[0]);
1019 if (items > 1)
1020 r->level[1].sens = le32_to_cpu(buf[1]);
1021 else
1022 r->level[1].sens = r->level[0].sens;
1023
1024 rc = ebitmap_read(&r->level[0].cat, fp);
1025 if (rc) {
1026 pr_err("SELinux: mls: error reading low categories\n");
1027 goto out;
1028 }
1029 if (items > 1) {
1030 rc = ebitmap_read(&r->level[1].cat, fp);
1031 if (rc) {
1032 pr_err("SELinux: mls: error reading high categories\n");
1033 goto bad_high;
1034 }
1035 } else {
1036 rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat);
1037 if (rc) {
1038 pr_err("SELinux: mls: out of memory\n");
1039 goto bad_high;
1040 }
1041 }
1042
1043 return 0;
1044bad_high:
1045 ebitmap_destroy(&r->level[0].cat);
1046out:
1047 return rc;
1048}
1049
1050/*
1051 * Read and validate a security context structure
1052 * from a policydb binary representation file.
1053 */
1054static int context_read_and_validate(struct context *c, struct policydb *p,
1055 void *fp)
1056{
1057 __le32 buf[3];
1058 int rc;
1059
1060 rc = next_entry(buf, fp, sizeof buf);
1061 if (rc) {
1062 pr_err("SELinux: context truncated\n");
1063 goto out;
1064 }
1065 c->user = le32_to_cpu(buf[0]);
1066 c->role = le32_to_cpu(buf[1]);
1067 c->type = le32_to_cpu(buf[2]);
1068 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1069 rc = mls_read_range_helper(&c->range, fp);
1070 if (rc) {
1071 pr_err("SELinux: error reading MLS range of context\n");
1072 goto out;
1073 }
1074 }
1075
1076 rc = -EINVAL;
1077 if (!policydb_context_isvalid(p, c)) {
1078 pr_err("SELinux: invalid security context\n");
1079 context_destroy(c);
1080 goto out;
1081 }
1082 rc = 0;
1083out:
1084 return rc;
1085}
1086
1087/*
1088 * The following *_read functions are used to
1089 * read the symbol data from a policy database
1090 * binary representation file.
1091 */
1092
1093static int str_read(char **strp, gfp_t flags, void *fp, u32 len)
1094{
1095 int rc;
1096 char *str;
1097
1098 if ((len == 0) || (len == (u32)-1))
1099 return -EINVAL;
1100
1101 str = kmalloc(len + 1, flags | __GFP_NOWARN);
1102 if (!str)
1103 return -ENOMEM;
1104
1105 rc = next_entry(str, fp, len);
1106 if (rc) {
1107 kfree(str);
1108 return rc;
1109 }
1110
1111 str[len] = '\0';
1112 *strp = str;
1113 return 0;
1114}
1115
1116static int perm_read(struct policydb *p, struct symtab *s, void *fp)
1117{
1118 char *key = NULL;
1119 struct perm_datum *perdatum;
1120 int rc;
1121 __le32 buf[2];
1122 u32 len;
1123
1124 perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
1125 if (!perdatum)
1126 return -ENOMEM;
1127
1128 rc = next_entry(buf, fp, sizeof buf);
1129 if (rc)
1130 goto bad;
1131
1132 len = le32_to_cpu(buf[0]);
1133 perdatum->value = le32_to_cpu(buf[1]);
1134
1135 rc = str_read(&key, GFP_KERNEL, fp, len);
1136 if (rc)
1137 goto bad;
1138
1139 rc = symtab_insert(s, key, perdatum);
1140 if (rc)
1141 goto bad;
1142
1143 return 0;
1144bad:
1145 perm_destroy(key, perdatum, NULL);
1146 return rc;
1147}
1148
1149static int common_read(struct policydb *p, struct symtab *s, void *fp)
1150{
1151 char *key = NULL;
1152 struct common_datum *comdatum;
1153 __le32 buf[4];
1154 u32 i, len, nel;
1155 int rc;
1156
1157 comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
1158 if (!comdatum)
1159 return -ENOMEM;
1160
1161 rc = next_entry(buf, fp, sizeof buf);
1162 if (rc)
1163 goto bad;
1164
1165 len = le32_to_cpu(buf[0]);
1166 comdatum->value = le32_to_cpu(buf[1]);
1167 nel = le32_to_cpu(buf[3]);
1168
1169 rc = symtab_init(&comdatum->permissions, nel);
1170 if (rc)
1171 goto bad;
1172 comdatum->permissions.nprim = le32_to_cpu(buf[2]);
1173
1174 rc = str_read(&key, GFP_KERNEL, fp, len);
1175 if (rc)
1176 goto bad;
1177
1178 for (i = 0; i < nel; i++) {
1179 rc = perm_read(p, &comdatum->permissions, fp);
1180 if (rc)
1181 goto bad;
1182 }
1183
1184 hash_eval(&comdatum->permissions.table, "common_permissions", key);
1185
1186 rc = symtab_insert(s, key, comdatum);
1187 if (rc)
1188 goto bad;
1189 return 0;
1190bad:
1191 common_destroy(key, comdatum, NULL);
1192 return rc;
1193}
1194
1195static void type_set_init(struct type_set *t)
1196{
1197 ebitmap_init(&t->types);
1198 ebitmap_init(&t->negset);
1199}
1200
1201static int type_set_read(struct type_set *t, void *fp)
1202{
1203 __le32 buf[1];
1204 int rc;
1205
1206 if (ebitmap_read(&t->types, fp))
1207 return -EINVAL;
1208 if (ebitmap_read(&t->negset, fp))
1209 return -EINVAL;
1210
1211 rc = next_entry(buf, fp, sizeof(u32));
1212 if (rc < 0)
1213 return -EINVAL;
1214 t->flags = le32_to_cpu(buf[0]);
1215
1216 return 0;
1217}
1218
1219static int read_cons_helper(struct policydb *p, struct constraint_node **nodep,
1220 u32 ncons, int allowxtarget, void *fp)
1221{
1222 struct constraint_node *c, *lc;
1223 struct constraint_expr *e, *le;
1224 __le32 buf[3];
1225 u32 i, j, nexpr;
1226 int rc, depth;
1227
1228 lc = NULL;
1229 for (i = 0; i < ncons; i++) {
1230 c = kzalloc(sizeof(*c), GFP_KERNEL);
1231 if (!c)
1232 return -ENOMEM;
1233
1234 if (lc)
1235 lc->next = c;
1236 else
1237 *nodep = c;
1238
1239 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1240 if (rc)
1241 return rc;
1242 c->permissions = le32_to_cpu(buf[0]);
1243 nexpr = le32_to_cpu(buf[1]);
1244 le = NULL;
1245 depth = -1;
1246 for (j = 0; j < nexpr; j++) {
1247 e = kzalloc(sizeof(*e), GFP_KERNEL);
1248 if (!e)
1249 return -ENOMEM;
1250
1251 if (le)
1252 le->next = e;
1253 else
1254 c->expr = e;
1255
1256 rc = next_entry(buf, fp, (sizeof(u32) * 3));
1257 if (rc)
1258 return rc;
1259 e->expr_type = le32_to_cpu(buf[0]);
1260 e->attr = le32_to_cpu(buf[1]);
1261 e->op = le32_to_cpu(buf[2]);
1262
1263 switch (e->expr_type) {
1264 case CEXPR_NOT:
1265 if (depth < 0)
1266 return -EINVAL;
1267 break;
1268 case CEXPR_AND:
1269 case CEXPR_OR:
1270 if (depth < 1)
1271 return -EINVAL;
1272 depth--;
1273 break;
1274 case CEXPR_ATTR:
1275 if (depth == (CEXPR_MAXDEPTH - 1))
1276 return -EINVAL;
1277 depth++;
1278 break;
1279 case CEXPR_NAMES:
1280 if (!allowxtarget && (e->attr & CEXPR_XTARGET))
1281 return -EINVAL;
1282 if (depth == (CEXPR_MAXDEPTH - 1))
1283 return -EINVAL;
1284 depth++;
1285 rc = ebitmap_read(&e->names, fp);
1286 if (rc)
1287 return rc;
1288 if (p->policyvers >=
1289 POLICYDB_VERSION_CONSTRAINT_NAMES) {
1290 e->type_names =
1291 kzalloc(sizeof(*e->type_names),
1292 GFP_KERNEL);
1293 if (!e->type_names)
1294 return -ENOMEM;
1295 type_set_init(e->type_names);
1296 rc = type_set_read(e->type_names, fp);
1297 if (rc)
1298 return rc;
1299 }
1300 break;
1301 default:
1302 return -EINVAL;
1303 }
1304 le = e;
1305 }
1306 if (depth != 0)
1307 return -EINVAL;
1308 lc = c;
1309 }
1310
1311 return 0;
1312}
1313
1314static int class_read(struct policydb *p, struct symtab *s, void *fp)
1315{
1316 char *key = NULL;
1317 struct class_datum *cladatum;
1318 __le32 buf[6];
1319 u32 i, len, len2, ncons, nel;
1320 int rc;
1321
1322 cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
1323 if (!cladatum)
1324 return -ENOMEM;
1325
1326 rc = next_entry(buf, fp, sizeof(u32) * 6);
1327 if (rc)
1328 goto bad;
1329
1330 len = le32_to_cpu(buf[0]);
1331 len2 = le32_to_cpu(buf[1]);
1332 cladatum->value = le32_to_cpu(buf[2]);
1333 nel = le32_to_cpu(buf[4]);
1334
1335 rc = symtab_init(&cladatum->permissions, nel);
1336 if (rc)
1337 goto bad;
1338 cladatum->permissions.nprim = le32_to_cpu(buf[3]);
1339
1340 ncons = le32_to_cpu(buf[5]);
1341
1342 rc = str_read(&key, GFP_KERNEL, fp, len);
1343 if (rc)
1344 goto bad;
1345
1346 if (len2) {
1347 rc = str_read(&cladatum->comkey, GFP_KERNEL, fp, len2);
1348 if (rc)
1349 goto bad;
1350
1351 rc = -EINVAL;
1352 cladatum->comdatum =
1353 symtab_search(&p->p_commons, cladatum->comkey);
1354 if (!cladatum->comdatum) {
1355 pr_err("SELinux: unknown common %s\n",
1356 cladatum->comkey);
1357 goto bad;
1358 }
1359 }
1360 for (i = 0; i < nel; i++) {
1361 rc = perm_read(p, &cladatum->permissions, fp);
1362 if (rc)
1363 goto bad;
1364 }
1365
1366 hash_eval(&cladatum->permissions.table, "class_permissions", key);
1367
1368 rc = read_cons_helper(p, &cladatum->constraints, ncons, 0, fp);
1369 if (rc)
1370 goto bad;
1371
1372 if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
1373 /* grab the validatetrans rules */
1374 rc = next_entry(buf, fp, sizeof(u32));
1375 if (rc)
1376 goto bad;
1377 ncons = le32_to_cpu(buf[0]);
1378 rc = read_cons_helper(p, &cladatum->validatetrans, ncons, 1,
1379 fp);
1380 if (rc)
1381 goto bad;
1382 }
1383
1384 if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
1385 rc = next_entry(buf, fp, sizeof(u32) * 3);
1386 if (rc)
1387 goto bad;
1388
1389 cladatum->default_user = le32_to_cpu(buf[0]);
1390 cladatum->default_role = le32_to_cpu(buf[1]);
1391 cladatum->default_range = le32_to_cpu(buf[2]);
1392 }
1393
1394 if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
1395 rc = next_entry(buf, fp, sizeof(u32) * 1);
1396 if (rc)
1397 goto bad;
1398 cladatum->default_type = le32_to_cpu(buf[0]);
1399 }
1400
1401 rc = symtab_insert(s, key, cladatum);
1402 if (rc)
1403 goto bad;
1404
1405 return 0;
1406bad:
1407 cls_destroy(key, cladatum, NULL);
1408 return rc;
1409}
1410
1411static int role_read(struct policydb *p, struct symtab *s, void *fp)
1412{
1413 char *key = NULL;
1414 struct role_datum *role;
1415 int rc;
1416 unsigned int to_read = 2;
1417 __le32 buf[3];
1418 u32 len;
1419
1420 role = kzalloc(sizeof(*role), GFP_KERNEL);
1421 if (!role)
1422 return -ENOMEM;
1423
1424 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1425 to_read = 3;
1426
1427 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1428 if (rc)
1429 goto bad;
1430
1431 len = le32_to_cpu(buf[0]);
1432 role->value = le32_to_cpu(buf[1]);
1433 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1434 role->bounds = le32_to_cpu(buf[2]);
1435
1436 rc = str_read(&key, GFP_KERNEL, fp, len);
1437 if (rc)
1438 goto bad;
1439
1440 rc = ebitmap_read(&role->dominates, fp);
1441 if (rc)
1442 goto bad;
1443
1444 rc = ebitmap_read(&role->types, fp);
1445 if (rc)
1446 goto bad;
1447
1448 if (strcmp(key, OBJECT_R) == 0) {
1449 rc = -EINVAL;
1450 if (role->value != OBJECT_R_VAL) {
1451 pr_err("SELinux: Role %s has wrong value %d\n",
1452 OBJECT_R, role->value);
1453 goto bad;
1454 }
1455 rc = 0;
1456 goto bad;
1457 }
1458
1459 rc = symtab_insert(s, key, role);
1460 if (rc)
1461 goto bad;
1462 return 0;
1463bad:
1464 role_destroy(key, role, NULL);
1465 return rc;
1466}
1467
1468static int type_read(struct policydb *p, struct symtab *s, void *fp)
1469{
1470 char *key = NULL;
1471 struct type_datum *typdatum;
1472 int rc;
1473 unsigned int to_read = 3;
1474 __le32 buf[4];
1475 u32 len;
1476
1477 typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL);
1478 if (!typdatum)
1479 return -ENOMEM;
1480
1481 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1482 to_read = 4;
1483
1484 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1485 if (rc)
1486 goto bad;
1487
1488 len = le32_to_cpu(buf[0]);
1489 typdatum->value = le32_to_cpu(buf[1]);
1490 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
1491 u32 prop = le32_to_cpu(buf[2]);
1492
1493 if (prop & TYPEDATUM_PROPERTY_PRIMARY)
1494 typdatum->primary = 1;
1495 if (prop & TYPEDATUM_PROPERTY_ATTRIBUTE)
1496 typdatum->attribute = 1;
1497
1498 typdatum->bounds = le32_to_cpu(buf[3]);
1499 } else {
1500 typdatum->primary = le32_to_cpu(buf[2]);
1501 }
1502
1503 rc = str_read(&key, GFP_KERNEL, fp, len);
1504 if (rc)
1505 goto bad;
1506
1507 rc = symtab_insert(s, key, typdatum);
1508 if (rc)
1509 goto bad;
1510 return 0;
1511bad:
1512 type_destroy(key, typdatum, NULL);
1513 return rc;
1514}
1515
1516/*
1517 * Read a MLS level structure from a policydb binary
1518 * representation file.
1519 */
1520static int mls_read_level(struct mls_level *lp, void *fp)
1521{
1522 __le32 buf[1];
1523 int rc;
1524
1525 memset(lp, 0, sizeof(*lp));
1526
1527 rc = next_entry(buf, fp, sizeof buf);
1528 if (rc) {
1529 pr_err("SELinux: mls: truncated level\n");
1530 return rc;
1531 }
1532 lp->sens = le32_to_cpu(buf[0]);
1533
1534 rc = ebitmap_read(&lp->cat, fp);
1535 if (rc) {
1536 pr_err("SELinux: mls: error reading level categories\n");
1537 return rc;
1538 }
1539 return 0;
1540}
1541
1542static int user_read(struct policydb *p, struct symtab *s, void *fp)
1543{
1544 char *key = NULL;
1545 struct user_datum *usrdatum;
1546 int rc;
1547 unsigned int to_read = 2;
1548 __le32 buf[3];
1549 u32 len;
1550
1551 usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
1552 if (!usrdatum)
1553 return -ENOMEM;
1554
1555 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1556 to_read = 3;
1557
1558 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1559 if (rc)
1560 goto bad;
1561
1562 len = le32_to_cpu(buf[0]);
1563 usrdatum->value = le32_to_cpu(buf[1]);
1564 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1565 usrdatum->bounds = le32_to_cpu(buf[2]);
1566
1567 rc = str_read(&key, GFP_KERNEL, fp, len);
1568 if (rc)
1569 goto bad;
1570
1571 rc = ebitmap_read(&usrdatum->roles, fp);
1572 if (rc)
1573 goto bad;
1574
1575 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1576 rc = mls_read_range_helper(&usrdatum->range, fp);
1577 if (rc)
1578 goto bad;
1579 rc = mls_read_level(&usrdatum->dfltlevel, fp);
1580 if (rc)
1581 goto bad;
1582 }
1583
1584 rc = symtab_insert(s, key, usrdatum);
1585 if (rc)
1586 goto bad;
1587 return 0;
1588bad:
1589 user_destroy(key, usrdatum, NULL);
1590 return rc;
1591}
1592
1593static int sens_read(struct policydb *p, struct symtab *s, void *fp)
1594{
1595 char *key = NULL;
1596 struct level_datum *levdatum;
1597 int rc;
1598 __le32 buf[2];
1599 u32 len;
1600
1601 levdatum = kzalloc(sizeof(*levdatum), GFP_KERNEL);
1602 if (!levdatum)
1603 return -ENOMEM;
1604
1605 rc = next_entry(buf, fp, sizeof buf);
1606 if (rc)
1607 goto bad;
1608
1609 len = le32_to_cpu(buf[0]);
1610 levdatum->isalias = le32_to_cpu(buf[1]);
1611
1612 rc = str_read(&key, GFP_KERNEL, fp, len);
1613 if (rc)
1614 goto bad;
1615
1616 rc = -ENOMEM;
1617 levdatum->level = kmalloc(sizeof(*levdatum->level), GFP_KERNEL);
1618 if (!levdatum->level)
1619 goto bad;
1620
1621 rc = mls_read_level(levdatum->level, fp);
1622 if (rc)
1623 goto bad;
1624
1625 rc = symtab_insert(s, key, levdatum);
1626 if (rc)
1627 goto bad;
1628 return 0;
1629bad:
1630 sens_destroy(key, levdatum, NULL);
1631 return rc;
1632}
1633
1634static int cat_read(struct policydb *p, struct symtab *s, void *fp)
1635{
1636 char *key = NULL;
1637 struct cat_datum *catdatum;
1638 int rc;
1639 __le32 buf[3];
1640 u32 len;
1641
1642 catdatum = kzalloc(sizeof(*catdatum), GFP_KERNEL);
1643 if (!catdatum)
1644 return -ENOMEM;
1645
1646 rc = next_entry(buf, fp, sizeof buf);
1647 if (rc)
1648 goto bad;
1649
1650 len = le32_to_cpu(buf[0]);
1651 catdatum->value = le32_to_cpu(buf[1]);
1652 catdatum->isalias = le32_to_cpu(buf[2]);
1653
1654 rc = str_read(&key, GFP_KERNEL, fp, len);
1655 if (rc)
1656 goto bad;
1657
1658 rc = symtab_insert(s, key, catdatum);
1659 if (rc)
1660 goto bad;
1661 return 0;
1662bad:
1663 cat_destroy(key, catdatum, NULL);
1664 return rc;
1665}
1666
1667/* clang-format off */
1668static int (*const read_f[SYM_NUM])(struct policydb *p, struct symtab *s,
1669 void *fp) = {
1670 common_read,
1671 class_read,
1672 role_read,
1673 type_read,
1674 user_read,
1675 cond_read_bool,
1676 sens_read,
1677 cat_read,
1678};
1679/* clang-format on */
1680
1681static int user_bounds_sanity_check(void *key, void *datum, void *datap)
1682{
1683 struct user_datum *upper, *user;
1684 struct policydb *p = datap;
1685 int depth = 0;
1686
1687 upper = user = datum;
1688 while (upper->bounds) {
1689 struct ebitmap_node *node;
1690 u32 bit;
1691
1692 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1693 pr_err("SELinux: user %s: "
1694 "too deep or looped boundary\n",
1695 (char *)key);
1696 return -EINVAL;
1697 }
1698
1699 upper = p->user_val_to_struct[upper->bounds - 1];
1700 ebitmap_for_each_positive_bit(&user->roles, node, bit)
1701 {
1702 if (ebitmap_get_bit(&upper->roles, bit))
1703 continue;
1704
1705 pr_err("SELinux: boundary violated policy: "
1706 "user=%s role=%s bounds=%s\n",
1707 sym_name(p, SYM_USERS, user->value - 1),
1708 sym_name(p, SYM_ROLES, bit),
1709 sym_name(p, SYM_USERS, upper->value - 1));
1710
1711 return -EINVAL;
1712 }
1713 }
1714
1715 return 0;
1716}
1717
1718static int role_bounds_sanity_check(void *key, void *datum, void *datap)
1719{
1720 struct role_datum *upper, *role;
1721 struct policydb *p = datap;
1722 int depth = 0;
1723
1724 upper = role = datum;
1725 while (upper->bounds) {
1726 struct ebitmap_node *node;
1727 u32 bit;
1728
1729 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1730 pr_err("SELinux: role %s: "
1731 "too deep or looped bounds\n",
1732 (char *)key);
1733 return -EINVAL;
1734 }
1735
1736 upper = p->role_val_to_struct[upper->bounds - 1];
1737 ebitmap_for_each_positive_bit(&role->types, node, bit)
1738 {
1739 if (ebitmap_get_bit(&upper->types, bit))
1740 continue;
1741
1742 pr_err("SELinux: boundary violated policy: "
1743 "role=%s type=%s bounds=%s\n",
1744 sym_name(p, SYM_ROLES, role->value - 1),
1745 sym_name(p, SYM_TYPES, bit),
1746 sym_name(p, SYM_ROLES, upper->value - 1));
1747
1748 return -EINVAL;
1749 }
1750 }
1751
1752 return 0;
1753}
1754
1755static int type_bounds_sanity_check(void *key, void *datum, void *datap)
1756{
1757 struct type_datum *upper;
1758 struct policydb *p = datap;
1759 int depth = 0;
1760
1761 upper = datum;
1762 while (upper->bounds) {
1763 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1764 pr_err("SELinux: type %s: "
1765 "too deep or looped boundary\n",
1766 (char *)key);
1767 return -EINVAL;
1768 }
1769
1770 upper = p->type_val_to_struct[upper->bounds - 1];
1771 BUG_ON(!upper);
1772
1773 if (upper->attribute) {
1774 pr_err("SELinux: type %s: "
1775 "bounded by attribute %s\n",
1776 (char *)key,
1777 sym_name(p, SYM_TYPES, upper->value - 1));
1778 return -EINVAL;
1779 }
1780 }
1781
1782 return 0;
1783}
1784
1785static int policydb_bounds_sanity_check(struct policydb *p)
1786{
1787 int rc;
1788
1789 if (p->policyvers < POLICYDB_VERSION_BOUNDARY)
1790 return 0;
1791
1792 rc = hashtab_map(&p->p_users.table, user_bounds_sanity_check, p);
1793 if (rc)
1794 return rc;
1795
1796 rc = hashtab_map(&p->p_roles.table, role_bounds_sanity_check, p);
1797 if (rc)
1798 return rc;
1799
1800 rc = hashtab_map(&p->p_types.table, type_bounds_sanity_check, p);
1801 if (rc)
1802 return rc;
1803
1804 return 0;
1805}
1806
1807u16 string_to_security_class(struct policydb *p, const char *name)
1808{
1809 struct class_datum *cladatum;
1810
1811 cladatum = symtab_search(&p->p_classes, name);
1812 if (!cladatum)
1813 return 0;
1814
1815 return cladatum->value;
1816}
1817
1818u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name)
1819{
1820 struct class_datum *cladatum;
1821 struct perm_datum *perdatum = NULL;
1822 struct common_datum *comdatum;
1823
1824 if (!tclass || tclass > p->p_classes.nprim)
1825 return 0;
1826
1827 cladatum = p->class_val_to_struct[tclass - 1];
1828 comdatum = cladatum->comdatum;
1829 if (comdatum)
1830 perdatum = symtab_search(&comdatum->permissions, name);
1831 if (!perdatum)
1832 perdatum = symtab_search(&cladatum->permissions, name);
1833 if (!perdatum)
1834 return 0;
1835
1836 return 1U << (perdatum->value - 1);
1837}
1838
1839static int range_read(struct policydb *p, void *fp)
1840{
1841 struct range_trans *rt = NULL;
1842 struct mls_range *r = NULL;
1843 int rc;
1844 __le32 buf[2];
1845 u32 i, nel;
1846
1847 if (p->policyvers < POLICYDB_VERSION_MLS)
1848 return 0;
1849
1850 rc = next_entry(buf, fp, sizeof(u32));
1851 if (rc)
1852 return rc;
1853
1854 nel = le32_to_cpu(buf[0]);
1855
1856 rc = hashtab_init(&p->range_tr, nel);
1857 if (rc)
1858 return rc;
1859
1860 for (i = 0; i < nel; i++) {
1861 rc = -ENOMEM;
1862 rt = kzalloc(sizeof(*rt), GFP_KERNEL);
1863 if (!rt)
1864 goto out;
1865
1866 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1867 if (rc)
1868 goto out;
1869
1870 rt->source_type = le32_to_cpu(buf[0]);
1871 rt->target_type = le32_to_cpu(buf[1]);
1872 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
1873 rc = next_entry(buf, fp, sizeof(u32));
1874 if (rc)
1875 goto out;
1876 rt->target_class = le32_to_cpu(buf[0]);
1877 } else
1878 rt->target_class = p->process_class;
1879
1880 rc = -EINVAL;
1881 if (!policydb_type_isvalid(p, rt->source_type) ||
1882 !policydb_type_isvalid(p, rt->target_type) ||
1883 !policydb_class_isvalid(p, rt->target_class))
1884 goto out;
1885
1886 rc = -ENOMEM;
1887 r = kzalloc(sizeof(*r), GFP_KERNEL);
1888 if (!r)
1889 goto out;
1890
1891 rc = mls_read_range_helper(r, fp);
1892 if (rc)
1893 goto out;
1894
1895 rc = -EINVAL;
1896 if (!mls_range_isvalid(p, r)) {
1897 pr_warn("SELinux: rangetrans: invalid range\n");
1898 goto out;
1899 }
1900
1901 rc = hashtab_insert(&p->range_tr, rt, r, rangetr_key_params);
1902 if (rc)
1903 goto out;
1904
1905 rt = NULL;
1906 r = NULL;
1907 }
1908 hash_eval(&p->range_tr, "rangetr", NULL);
1909 rc = 0;
1910out:
1911 kfree(rt);
1912 kfree(r);
1913 return rc;
1914}
1915
1916static int filename_trans_read_helper_compat(struct policydb *p, void *fp)
1917{
1918 struct filename_trans_key key, *ft = NULL;
1919 struct filename_trans_datum *last, *datum = NULL;
1920 char *name = NULL;
1921 u32 len, stype, otype;
1922 __le32 buf[4];
1923 int rc;
1924
1925 /* length of the path component string */
1926 rc = next_entry(buf, fp, sizeof(u32));
1927 if (rc)
1928 return rc;
1929 len = le32_to_cpu(buf[0]);
1930
1931 /* path component string */
1932 rc = str_read(&name, GFP_KERNEL, fp, len);
1933 if (rc)
1934 return rc;
1935
1936 rc = next_entry(buf, fp, sizeof(u32) * 4);
1937 if (rc)
1938 goto out;
1939
1940 stype = le32_to_cpu(buf[0]);
1941 key.ttype = le32_to_cpu(buf[1]);
1942 key.tclass = le32_to_cpu(buf[2]);
1943 key.name = name;
1944
1945 otype = le32_to_cpu(buf[3]);
1946
1947 last = NULL;
1948 datum = policydb_filenametr_search(p, &key);
1949 while (datum) {
1950 if (unlikely(ebitmap_get_bit(&datum->stypes, stype - 1))) {
1951 /* conflicting/duplicate rules are ignored */
1952 datum = NULL;
1953 rc = 0;
1954 goto out;
1955 }
1956 if (likely(datum->otype == otype))
1957 break;
1958 last = datum;
1959 datum = datum->next;
1960 }
1961 if (!datum) {
1962 rc = -ENOMEM;
1963 datum = kmalloc(sizeof(*datum), GFP_KERNEL);
1964 if (!datum)
1965 goto out;
1966
1967 ebitmap_init(&datum->stypes);
1968 datum->otype = otype;
1969 datum->next = NULL;
1970
1971 if (unlikely(last)) {
1972 last->next = datum;
1973 } else {
1974 rc = -ENOMEM;
1975 ft = kmemdup(&key, sizeof(key), GFP_KERNEL);
1976 if (!ft)
1977 goto out;
1978
1979 rc = hashtab_insert(&p->filename_trans, ft, datum,
1980 filenametr_key_params);
1981 if (rc)
1982 goto out;
1983 name = NULL;
1984
1985 rc = ebitmap_set_bit(&p->filename_trans_ttypes,
1986 key.ttype, 1);
1987 if (rc)
1988 return rc;
1989 }
1990 }
1991 kfree(name);
1992 return ebitmap_set_bit(&datum->stypes, stype - 1, 1);
1993
1994out:
1995 kfree(ft);
1996 kfree(name);
1997 kfree(datum);
1998 return rc;
1999}
2000
2001static int filename_trans_read_helper(struct policydb *p, void *fp)
2002{
2003 struct filename_trans_key *ft = NULL;
2004 struct filename_trans_datum **dst, *datum, *first = NULL;
2005 char *name = NULL;
2006 u32 len, ttype, tclass, ndatum, i;
2007 __le32 buf[3];
2008 int rc;
2009
2010 /* length of the path component string */
2011 rc = next_entry(buf, fp, sizeof(u32));
2012 if (rc)
2013 return rc;
2014 len = le32_to_cpu(buf[0]);
2015
2016 /* path component string */
2017 rc = str_read(&name, GFP_KERNEL, fp, len);
2018 if (rc)
2019 return rc;
2020
2021 rc = next_entry(buf, fp, sizeof(u32) * 3);
2022 if (rc)
2023 goto out;
2024
2025 ttype = le32_to_cpu(buf[0]);
2026 tclass = le32_to_cpu(buf[1]);
2027
2028 ndatum = le32_to_cpu(buf[2]);
2029 if (ndatum == 0) {
2030 pr_err("SELinux: Filename transition key with no datum\n");
2031 rc = -ENOENT;
2032 goto out;
2033 }
2034
2035 dst = &first;
2036 for (i = 0; i < ndatum; i++) {
2037 rc = -ENOMEM;
2038 datum = kmalloc(sizeof(*datum), GFP_KERNEL);
2039 if (!datum)
2040 goto out;
2041
2042 datum->next = NULL;
2043 *dst = datum;
2044
2045 /* ebitmap_read() will at least init the bitmap */
2046 rc = ebitmap_read(&datum->stypes, fp);
2047 if (rc)
2048 goto out;
2049
2050 rc = next_entry(buf, fp, sizeof(u32));
2051 if (rc)
2052 goto out;
2053
2054 datum->otype = le32_to_cpu(buf[0]);
2055
2056 dst = &datum->next;
2057 }
2058
2059 rc = -ENOMEM;
2060 ft = kmalloc(sizeof(*ft), GFP_KERNEL);
2061 if (!ft)
2062 goto out;
2063
2064 ft->ttype = ttype;
2065 ft->tclass = tclass;
2066 ft->name = name;
2067
2068 rc = hashtab_insert(&p->filename_trans, ft, first,
2069 filenametr_key_params);
2070 if (rc == -EEXIST)
2071 pr_err("SELinux: Duplicate filename transition key\n");
2072 if (rc)
2073 goto out;
2074
2075 return ebitmap_set_bit(&p->filename_trans_ttypes, ttype, 1);
2076
2077out:
2078 kfree(ft);
2079 kfree(name);
2080 while (first) {
2081 datum = first;
2082 first = first->next;
2083
2084 ebitmap_destroy(&datum->stypes);
2085 kfree(datum);
2086 }
2087 return rc;
2088}
2089
2090static int filename_trans_read(struct policydb *p, void *fp)
2091{
2092 u32 nel, i;
2093 __le32 buf[1];
2094 int rc;
2095
2096 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
2097 return 0;
2098
2099 rc = next_entry(buf, fp, sizeof(u32));
2100 if (rc)
2101 return rc;
2102 nel = le32_to_cpu(buf[0]);
2103
2104 if (p->policyvers < POLICYDB_VERSION_COMP_FTRANS) {
2105 p->compat_filename_trans_count = nel;
2106
2107 rc = hashtab_init(&p->filename_trans, (1 << 11));
2108 if (rc)
2109 return rc;
2110
2111 for (i = 0; i < nel; i++) {
2112 rc = filename_trans_read_helper_compat(p, fp);
2113 if (rc)
2114 return rc;
2115 }
2116 } else {
2117 rc = hashtab_init(&p->filename_trans, nel);
2118 if (rc)
2119 return rc;
2120
2121 for (i = 0; i < nel; i++) {
2122 rc = filename_trans_read_helper(p, fp);
2123 if (rc)
2124 return rc;
2125 }
2126 }
2127 hash_eval(&p->filename_trans, "filenametr", NULL);
2128 return 0;
2129}
2130
2131static int genfs_read(struct policydb *p, void *fp)
2132{
2133 int rc;
2134 u32 i, j, nel, nel2, len, len2;
2135 __le32 buf[1];
2136 struct ocontext *l, *c;
2137 struct ocontext *newc = NULL;
2138 struct genfs *genfs_p, *genfs;
2139 struct genfs *newgenfs = NULL;
2140
2141 rc = next_entry(buf, fp, sizeof(u32));
2142 if (rc)
2143 return rc;
2144 nel = le32_to_cpu(buf[0]);
2145
2146 for (i = 0; i < nel; i++) {
2147 rc = next_entry(buf, fp, sizeof(u32));
2148 if (rc)
2149 goto out;
2150 len = le32_to_cpu(buf[0]);
2151
2152 rc = -ENOMEM;
2153 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
2154 if (!newgenfs)
2155 goto out;
2156
2157 rc = str_read(&newgenfs->fstype, GFP_KERNEL, fp, len);
2158 if (rc)
2159 goto out;
2160
2161 for (genfs_p = NULL, genfs = p->genfs; genfs;
2162 genfs_p = genfs, genfs = genfs->next) {
2163 rc = -EINVAL;
2164 if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
2165 pr_err("SELinux: dup genfs fstype %s\n",
2166 newgenfs->fstype);
2167 goto out;
2168 }
2169 if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
2170 break;
2171 }
2172 newgenfs->next = genfs;
2173 if (genfs_p)
2174 genfs_p->next = newgenfs;
2175 else
2176 p->genfs = newgenfs;
2177 genfs = newgenfs;
2178 newgenfs = NULL;
2179
2180 rc = next_entry(buf, fp, sizeof(u32));
2181 if (rc)
2182 goto out;
2183
2184 nel2 = le32_to_cpu(buf[0]);
2185 for (j = 0; j < nel2; j++) {
2186 rc = next_entry(buf, fp, sizeof(u32));
2187 if (rc)
2188 goto out;
2189 len = le32_to_cpu(buf[0]);
2190
2191 rc = -ENOMEM;
2192 newc = kzalloc(sizeof(*newc), GFP_KERNEL);
2193 if (!newc)
2194 goto out;
2195
2196 rc = str_read(&newc->u.name, GFP_KERNEL, fp, len);
2197 if (rc)
2198 goto out;
2199
2200 rc = next_entry(buf, fp, sizeof(u32));
2201 if (rc)
2202 goto out;
2203
2204 newc->v.sclass = le32_to_cpu(buf[0]);
2205 rc = context_read_and_validate(&newc->context[0], p,
2206 fp);
2207 if (rc)
2208 goto out;
2209
2210 for (l = NULL, c = genfs->head; c; l = c, c = c->next) {
2211 rc = -EINVAL;
2212 if (!strcmp(newc->u.name, c->u.name) &&
2213 (!c->v.sclass || !newc->v.sclass ||
2214 newc->v.sclass == c->v.sclass)) {
2215 pr_err("SELinux: dup genfs entry (%s,%s)\n",
2216 genfs->fstype, c->u.name);
2217 goto out;
2218 }
2219 len = strlen(newc->u.name);
2220 len2 = strlen(c->u.name);
2221 if (len > len2)
2222 break;
2223 }
2224
2225 newc->next = c;
2226 if (l)
2227 l->next = newc;
2228 else
2229 genfs->head = newc;
2230 newc = NULL;
2231 }
2232 }
2233 rc = 0;
2234out:
2235 if (newgenfs) {
2236 kfree(newgenfs->fstype);
2237 kfree(newgenfs);
2238 }
2239 ocontext_destroy(newc, OCON_FSUSE);
2240
2241 return rc;
2242}
2243
2244static int ocontext_read(struct policydb *p,
2245 const struct policydb_compat_info *info, void *fp)
2246{
2247 int rc;
2248 unsigned int i;
2249 u32 j, nel, len;
2250 __be64 prefixbuf[1];
2251 __le32 buf[3];
2252 struct ocontext *l, *c;
2253 u32 nodebuf[8];
2254
2255 for (i = 0; i < info->ocon_num; i++) {
2256 rc = next_entry(buf, fp, sizeof(u32));
2257 if (rc)
2258 goto out;
2259 nel = le32_to_cpu(buf[0]);
2260
2261 l = NULL;
2262 for (j = 0; j < nel; j++) {
2263 rc = -ENOMEM;
2264 c = kzalloc(sizeof(*c), GFP_KERNEL);
2265 if (!c)
2266 goto out;
2267 if (l)
2268 l->next = c;
2269 else
2270 p->ocontexts[i] = c;
2271 l = c;
2272
2273 switch (i) {
2274 case OCON_ISID:
2275 rc = next_entry(buf, fp, sizeof(u32));
2276 if (rc)
2277 goto out;
2278
2279 c->sid[0] = le32_to_cpu(buf[0]);
2280 rc = context_read_and_validate(&c->context[0],
2281 p, fp);
2282 if (rc)
2283 goto out;
2284 break;
2285 case OCON_FS:
2286 case OCON_NETIF:
2287 rc = next_entry(buf, fp, sizeof(u32));
2288 if (rc)
2289 goto out;
2290 len = le32_to_cpu(buf[0]);
2291
2292 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2293 if (rc)
2294 goto out;
2295
2296 if (i == OCON_FS)
2297 pr_warn("SELinux: void and deprecated fs ocon %s\n",
2298 c->u.name);
2299
2300 rc = context_read_and_validate(&c->context[0],
2301 p, fp);
2302 if (rc)
2303 goto out;
2304 rc = context_read_and_validate(&c->context[1],
2305 p, fp);
2306 if (rc)
2307 goto out;
2308 break;
2309 case OCON_PORT:
2310 rc = next_entry(buf, fp, sizeof(u32) * 3);
2311 if (rc)
2312 goto out;
2313 c->u.port.protocol = le32_to_cpu(buf[0]);
2314 c->u.port.low_port = le32_to_cpu(buf[1]);
2315 c->u.port.high_port = le32_to_cpu(buf[2]);
2316 rc = context_read_and_validate(&c->context[0],
2317 p, fp);
2318 if (rc)
2319 goto out;
2320 break;
2321 case OCON_NODE:
2322 rc = next_entry(nodebuf, fp, sizeof(u32) * 2);
2323 if (rc)
2324 goto out;
2325 c->u.node.addr = nodebuf[0]; /* network order */
2326 c->u.node.mask = nodebuf[1]; /* network order */
2327 rc = context_read_and_validate(&c->context[0],
2328 p, fp);
2329 if (rc)
2330 goto out;
2331 break;
2332 case OCON_FSUSE:
2333 rc = next_entry(buf, fp, sizeof(u32) * 2);
2334 if (rc)
2335 goto out;
2336
2337 rc = -EINVAL;
2338 c->v.behavior = le32_to_cpu(buf[0]);
2339 /* Determined at runtime, not in policy DB. */
2340 if (c->v.behavior == SECURITY_FS_USE_MNTPOINT)
2341 goto out;
2342 if (c->v.behavior > SECURITY_FS_USE_MAX)
2343 goto out;
2344
2345 len = le32_to_cpu(buf[1]);
2346 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2347 if (rc)
2348 goto out;
2349
2350 rc = context_read_and_validate(&c->context[0],
2351 p, fp);
2352 if (rc)
2353 goto out;
2354 break;
2355 case OCON_NODE6: {
2356 int k;
2357
2358 rc = next_entry(nodebuf, fp, sizeof(u32) * 8);
2359 if (rc)
2360 goto out;
2361 for (k = 0; k < 4; k++)
2362 c->u.node6.addr[k] = nodebuf[k];
2363 for (k = 0; k < 4; k++)
2364 c->u.node6.mask[k] = nodebuf[k + 4];
2365 rc = context_read_and_validate(&c->context[0],
2366 p, fp);
2367 if (rc)
2368 goto out;
2369 break;
2370 }
2371 case OCON_IBPKEY: {
2372 u32 pkey_lo, pkey_hi;
2373
2374 rc = next_entry(prefixbuf, fp, sizeof(u64));
2375 if (rc)
2376 goto out;
2377
2378 /* we need to have subnet_prefix in CPU order */
2379 c->u.ibpkey.subnet_prefix =
2380 be64_to_cpu(prefixbuf[0]);
2381
2382 rc = next_entry(buf, fp, sizeof(u32) * 2);
2383 if (rc)
2384 goto out;
2385
2386 pkey_lo = le32_to_cpu(buf[0]);
2387 pkey_hi = le32_to_cpu(buf[1]);
2388
2389 if (pkey_lo > U16_MAX || pkey_hi > U16_MAX) {
2390 rc = -EINVAL;
2391 goto out;
2392 }
2393
2394 c->u.ibpkey.low_pkey = pkey_lo;
2395 c->u.ibpkey.high_pkey = pkey_hi;
2396
2397 rc = context_read_and_validate(&c->context[0],
2398 p, fp);
2399 if (rc)
2400 goto out;
2401 break;
2402 }
2403 case OCON_IBENDPORT: {
2404 u32 port;
2405
2406 rc = next_entry(buf, fp, sizeof(u32) * 2);
2407 if (rc)
2408 goto out;
2409 len = le32_to_cpu(buf[0]);
2410
2411 rc = str_read(&c->u.ibendport.dev_name,
2412 GFP_KERNEL, fp, len);
2413 if (rc)
2414 goto out;
2415
2416 port = le32_to_cpu(buf[1]);
2417 if (port > U8_MAX || port == 0) {
2418 rc = -EINVAL;
2419 goto out;
2420 }
2421
2422 c->u.ibendport.port = port;
2423
2424 rc = context_read_and_validate(&c->context[0],
2425 p, fp);
2426 if (rc)
2427 goto out;
2428 break;
2429 } /* end case */
2430 } /* end switch */
2431 }
2432 }
2433 rc = 0;
2434out:
2435 return rc;
2436}
2437
2438/*
2439 * Read the configuration data from a policy database binary
2440 * representation file into a policy database structure.
2441 */
2442int policydb_read(struct policydb *p, void *fp)
2443{
2444 struct role_allow *ra, *lra;
2445 struct role_trans_key *rtk = NULL;
2446 struct role_trans_datum *rtd = NULL;
2447 int rc;
2448 __le32 buf[4];
2449 u32 i, j, len, nprim, nel, perm;
2450
2451 char *policydb_str;
2452 const struct policydb_compat_info *info;
2453
2454 policydb_init(p);
2455
2456 /* Read the magic number and string length. */
2457 rc = next_entry(buf, fp, sizeof(u32) * 2);
2458 if (rc)
2459 goto bad;
2460
2461 rc = -EINVAL;
2462 if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
2463 pr_err("SELinux: policydb magic number 0x%x does "
2464 "not match expected magic number 0x%x\n",
2465 le32_to_cpu(buf[0]), POLICYDB_MAGIC);
2466 goto bad;
2467 }
2468
2469 rc = -EINVAL;
2470 len = le32_to_cpu(buf[1]);
2471 if (len != strlen(POLICYDB_STRING)) {
2472 pr_err("SELinux: policydb string length %d does not "
2473 "match expected length %zu\n",
2474 len, strlen(POLICYDB_STRING));
2475 goto bad;
2476 }
2477
2478 rc = -ENOMEM;
2479 policydb_str = kmalloc(len + 1, GFP_KERNEL);
2480 if (!policydb_str) {
2481 pr_err("SELinux: unable to allocate memory for policydb "
2482 "string of length %d\n",
2483 len);
2484 goto bad;
2485 }
2486
2487 rc = next_entry(policydb_str, fp, len);
2488 if (rc) {
2489 pr_err("SELinux: truncated policydb string identifier\n");
2490 kfree(policydb_str);
2491 goto bad;
2492 }
2493
2494 rc = -EINVAL;
2495 policydb_str[len] = '\0';
2496 if (strcmp(policydb_str, POLICYDB_STRING)) {
2497 pr_err("SELinux: policydb string %s does not match "
2498 "my string %s\n",
2499 policydb_str, POLICYDB_STRING);
2500 kfree(policydb_str);
2501 goto bad;
2502 }
2503 /* Done with policydb_str. */
2504 kfree(policydb_str);
2505 policydb_str = NULL;
2506
2507 /* Read the version and table sizes. */
2508 rc = next_entry(buf, fp, sizeof(u32) * 4);
2509 if (rc)
2510 goto bad;
2511
2512 rc = -EINVAL;
2513 p->policyvers = le32_to_cpu(buf[0]);
2514 if (p->policyvers < POLICYDB_VERSION_MIN ||
2515 p->policyvers > POLICYDB_VERSION_MAX) {
2516 pr_err("SELinux: policydb version %d does not match "
2517 "my version range %d-%d\n",
2518 le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN,
2519 POLICYDB_VERSION_MAX);
2520 goto bad;
2521 }
2522
2523 if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
2524 p->mls_enabled = 1;
2525
2526 rc = -EINVAL;
2527 if (p->policyvers < POLICYDB_VERSION_MLS) {
2528 pr_err("SELinux: security policydb version %d "
2529 "(MLS) not backwards compatible\n",
2530 p->policyvers);
2531 goto bad;
2532 }
2533 }
2534 p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
2535 p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
2536
2537 if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
2538 rc = ebitmap_read(&p->policycaps, fp);
2539 if (rc)
2540 goto bad;
2541 }
2542
2543 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
2544 rc = ebitmap_read(&p->permissive_map, fp);
2545 if (rc)
2546 goto bad;
2547 }
2548
2549 rc = -EINVAL;
2550 info = policydb_lookup_compat(p->policyvers);
2551 if (!info) {
2552 pr_err("SELinux: unable to find policy compat info "
2553 "for version %d\n",
2554 p->policyvers);
2555 goto bad;
2556 }
2557
2558 rc = -EINVAL;
2559 if (le32_to_cpu(buf[2]) != info->sym_num ||
2560 le32_to_cpu(buf[3]) != info->ocon_num) {
2561 pr_err("SELinux: policydb table sizes (%d,%d) do "
2562 "not match mine (%d,%d)\n",
2563 le32_to_cpu(buf[2]), le32_to_cpu(buf[3]), info->sym_num,
2564 info->ocon_num);
2565 goto bad;
2566 }
2567
2568 for (i = 0; i < info->sym_num; i++) {
2569 rc = next_entry(buf, fp, sizeof(u32) * 2);
2570 if (rc)
2571 goto bad;
2572 nprim = le32_to_cpu(buf[0]);
2573 nel = le32_to_cpu(buf[1]);
2574
2575 rc = symtab_init(&p->symtab[i], nel);
2576 if (rc)
2577 goto out;
2578
2579 if (i == SYM_ROLES) {
2580 rc = roles_init(p);
2581 if (rc)
2582 goto out;
2583 }
2584
2585 for (j = 0; j < nel; j++) {
2586 rc = read_f[i](p, &p->symtab[i], fp);
2587 if (rc)
2588 goto bad;
2589 }
2590
2591 p->symtab[i].nprim = nprim;
2592 }
2593
2594 rc = -EINVAL;
2595 p->process_class = string_to_security_class(p, "process");
2596 if (!p->process_class) {
2597 pr_err("SELinux: process class is required, not defined in policy\n");
2598 goto bad;
2599 }
2600
2601 rc = avtab_read(&p->te_avtab, fp, p);
2602 if (rc)
2603 goto bad;
2604
2605 if (p->policyvers >= POLICYDB_VERSION_BOOL) {
2606 rc = cond_read_list(p, fp);
2607 if (rc)
2608 goto bad;
2609 }
2610
2611 rc = next_entry(buf, fp, sizeof(u32));
2612 if (rc)
2613 goto bad;
2614 nel = le32_to_cpu(buf[0]);
2615
2616 rc = hashtab_init(&p->role_tr, nel);
2617 if (rc)
2618 goto bad;
2619 for (i = 0; i < nel; i++) {
2620 rc = -ENOMEM;
2621 rtk = kmalloc(sizeof(*rtk), GFP_KERNEL);
2622 if (!rtk)
2623 goto bad;
2624
2625 rc = -ENOMEM;
2626 rtd = kmalloc(sizeof(*rtd), GFP_KERNEL);
2627 if (!rtd)
2628 goto bad;
2629
2630 rc = next_entry(buf, fp, sizeof(u32) * 3);
2631 if (rc)
2632 goto bad;
2633
2634 rtk->role = le32_to_cpu(buf[0]);
2635 rtk->type = le32_to_cpu(buf[1]);
2636 rtd->new_role = le32_to_cpu(buf[2]);
2637 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2638 rc = next_entry(buf, fp, sizeof(u32));
2639 if (rc)
2640 goto bad;
2641 rtk->tclass = le32_to_cpu(buf[0]);
2642 } else
2643 rtk->tclass = p->process_class;
2644
2645 rc = -EINVAL;
2646 if (!policydb_role_isvalid(p, rtk->role) ||
2647 !policydb_type_isvalid(p, rtk->type) ||
2648 !policydb_class_isvalid(p, rtk->tclass) ||
2649 !policydb_role_isvalid(p, rtd->new_role))
2650 goto bad;
2651
2652 rc = hashtab_insert(&p->role_tr, rtk, rtd, roletr_key_params);
2653 if (rc)
2654 goto bad;
2655
2656 rtk = NULL;
2657 rtd = NULL;
2658 }
2659
2660 hash_eval(&p->role_tr, "roletr", NULL);
2661
2662 rc = next_entry(buf, fp, sizeof(u32));
2663 if (rc)
2664 goto bad;
2665 nel = le32_to_cpu(buf[0]);
2666 lra = NULL;
2667 for (i = 0; i < nel; i++) {
2668 rc = -ENOMEM;
2669 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
2670 if (!ra)
2671 goto bad;
2672 if (lra)
2673 lra->next = ra;
2674 else
2675 p->role_allow = ra;
2676 rc = next_entry(buf, fp, sizeof(u32) * 2);
2677 if (rc)
2678 goto bad;
2679
2680 rc = -EINVAL;
2681 ra->role = le32_to_cpu(buf[0]);
2682 ra->new_role = le32_to_cpu(buf[1]);
2683 if (!policydb_role_isvalid(p, ra->role) ||
2684 !policydb_role_isvalid(p, ra->new_role))
2685 goto bad;
2686 lra = ra;
2687 }
2688
2689 rc = filename_trans_read(p, fp);
2690 if (rc)
2691 goto bad;
2692
2693 rc = policydb_index(p);
2694 if (rc)
2695 goto bad;
2696
2697 rc = -EINVAL;
2698 perm = string_to_av_perm(p, p->process_class, "transition");
2699 if (!perm) {
2700 pr_err("SELinux: process transition permission is required, not defined in policy\n");
2701 goto bad;
2702 }
2703 p->process_trans_perms = perm;
2704 perm = string_to_av_perm(p, p->process_class, "dyntransition");
2705 if (!perm) {
2706 pr_err("SELinux: process dyntransition permission is required, not defined in policy\n");
2707 goto bad;
2708 }
2709 p->process_trans_perms |= perm;
2710
2711 rc = ocontext_read(p, info, fp);
2712 if (rc)
2713 goto bad;
2714
2715 rc = genfs_read(p, fp);
2716 if (rc)
2717 goto bad;
2718
2719 rc = range_read(p, fp);
2720 if (rc)
2721 goto bad;
2722
2723 rc = -ENOMEM;
2724 p->type_attr_map_array = kvcalloc(
2725 p->p_types.nprim, sizeof(*p->type_attr_map_array), GFP_KERNEL);
2726 if (!p->type_attr_map_array)
2727 goto bad;
2728
2729 /* just in case ebitmap_init() becomes more than just a memset(0): */
2730 for (i = 0; i < p->p_types.nprim; i++)
2731 ebitmap_init(&p->type_attr_map_array[i]);
2732
2733 for (i = 0; i < p->p_types.nprim; i++) {
2734 struct ebitmap *e = &p->type_attr_map_array[i];
2735
2736 if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
2737 rc = ebitmap_read(e, fp);
2738 if (rc)
2739 goto bad;
2740 }
2741 /* add the type itself as the degenerate case */
2742 rc = ebitmap_set_bit(e, i, 1);
2743 if (rc)
2744 goto bad;
2745 }
2746
2747 rc = policydb_bounds_sanity_check(p);
2748 if (rc)
2749 goto bad;
2750
2751 rc = 0;
2752out:
2753 return rc;
2754bad:
2755 kfree(rtk);
2756 kfree(rtd);
2757 policydb_destroy(p);
2758 goto out;
2759}
2760
2761/*
2762 * Write a MLS level structure to a policydb binary
2763 * representation file.
2764 */
2765static int mls_write_level(struct mls_level *l, void *fp)
2766{
2767 __le32 buf[1];
2768 int rc;
2769
2770 buf[0] = cpu_to_le32(l->sens);
2771 rc = put_entry(buf, sizeof(u32), 1, fp);
2772 if (rc)
2773 return rc;
2774
2775 rc = ebitmap_write(&l->cat, fp);
2776 if (rc)
2777 return rc;
2778
2779 return 0;
2780}
2781
2782/*
2783 * Write a MLS range structure to a policydb binary
2784 * representation file.
2785 */
2786static int mls_write_range_helper(struct mls_range *r, void *fp)
2787{
2788 __le32 buf[3];
2789 size_t items;
2790 int rc, eq;
2791
2792 eq = mls_level_eq(&r->level[1], &r->level[0]);
2793
2794 if (eq)
2795 items = 2;
2796 else
2797 items = 3;
2798 buf[0] = cpu_to_le32(items - 1);
2799 buf[1] = cpu_to_le32(r->level[0].sens);
2800 if (!eq)
2801 buf[2] = cpu_to_le32(r->level[1].sens);
2802
2803 BUG_ON(items > ARRAY_SIZE(buf));
2804
2805 rc = put_entry(buf, sizeof(u32), items, fp);
2806 if (rc)
2807 return rc;
2808
2809 rc = ebitmap_write(&r->level[0].cat, fp);
2810 if (rc)
2811 return rc;
2812 if (!eq) {
2813 rc = ebitmap_write(&r->level[1].cat, fp);
2814 if (rc)
2815 return rc;
2816 }
2817
2818 return 0;
2819}
2820
2821static int sens_write(void *vkey, void *datum, void *ptr)
2822{
2823 char *key = vkey;
2824 struct level_datum *levdatum = datum;
2825 struct policy_data *pd = ptr;
2826 void *fp = pd->fp;
2827 __le32 buf[2];
2828 size_t len;
2829 int rc;
2830
2831 len = strlen(key);
2832 buf[0] = cpu_to_le32(len);
2833 buf[1] = cpu_to_le32(levdatum->isalias);
2834 rc = put_entry(buf, sizeof(u32), 2, fp);
2835 if (rc)
2836 return rc;
2837
2838 rc = put_entry(key, 1, len, fp);
2839 if (rc)
2840 return rc;
2841
2842 rc = mls_write_level(levdatum->level, fp);
2843 if (rc)
2844 return rc;
2845
2846 return 0;
2847}
2848
2849static int cat_write(void *vkey, void *datum, void *ptr)
2850{
2851 char *key = vkey;
2852 struct cat_datum *catdatum = datum;
2853 struct policy_data *pd = ptr;
2854 void *fp = pd->fp;
2855 __le32 buf[3];
2856 size_t len;
2857 int rc;
2858
2859 len = strlen(key);
2860 buf[0] = cpu_to_le32(len);
2861 buf[1] = cpu_to_le32(catdatum->value);
2862 buf[2] = cpu_to_le32(catdatum->isalias);
2863 rc = put_entry(buf, sizeof(u32), 3, fp);
2864 if (rc)
2865 return rc;
2866
2867 rc = put_entry(key, 1, len, fp);
2868 if (rc)
2869 return rc;
2870
2871 return 0;
2872}
2873
2874static int role_trans_write_one(void *key, void *datum, void *ptr)
2875{
2876 struct role_trans_key *rtk = key;
2877 struct role_trans_datum *rtd = datum;
2878 struct policy_data *pd = ptr;
2879 void *fp = pd->fp;
2880 struct policydb *p = pd->p;
2881 __le32 buf[3];
2882 int rc;
2883
2884 buf[0] = cpu_to_le32(rtk->role);
2885 buf[1] = cpu_to_le32(rtk->type);
2886 buf[2] = cpu_to_le32(rtd->new_role);
2887 rc = put_entry(buf, sizeof(u32), 3, fp);
2888 if (rc)
2889 return rc;
2890 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2891 buf[0] = cpu_to_le32(rtk->tclass);
2892 rc = put_entry(buf, sizeof(u32), 1, fp);
2893 if (rc)
2894 return rc;
2895 }
2896 return 0;
2897}
2898
2899static int role_trans_write(struct policydb *p, void *fp)
2900{
2901 struct policy_data pd = { .p = p, .fp = fp };
2902 __le32 buf[1];
2903 int rc;
2904
2905 buf[0] = cpu_to_le32(p->role_tr.nel);
2906 rc = put_entry(buf, sizeof(u32), 1, fp);
2907 if (rc)
2908 return rc;
2909
2910 return hashtab_map(&p->role_tr, role_trans_write_one, &pd);
2911}
2912
2913static int role_allow_write(struct role_allow *r, void *fp)
2914{
2915 struct role_allow *ra;
2916 __le32 buf[2];
2917 size_t nel;
2918 int rc;
2919
2920 nel = 0;
2921 for (ra = r; ra; ra = ra->next)
2922 nel++;
2923 buf[0] = cpu_to_le32(nel);
2924 rc = put_entry(buf, sizeof(u32), 1, fp);
2925 if (rc)
2926 return rc;
2927 for (ra = r; ra; ra = ra->next) {
2928 buf[0] = cpu_to_le32(ra->role);
2929 buf[1] = cpu_to_le32(ra->new_role);
2930 rc = put_entry(buf, sizeof(u32), 2, fp);
2931 if (rc)
2932 return rc;
2933 }
2934 return 0;
2935}
2936
2937/*
2938 * Write a security context structure
2939 * to a policydb binary representation file.
2940 */
2941static int context_write(struct policydb *p, struct context *c, void *fp)
2942{
2943 int rc;
2944 __le32 buf[3];
2945
2946 buf[0] = cpu_to_le32(c->user);
2947 buf[1] = cpu_to_le32(c->role);
2948 buf[2] = cpu_to_le32(c->type);
2949
2950 rc = put_entry(buf, sizeof(u32), 3, fp);
2951 if (rc)
2952 return rc;
2953
2954 rc = mls_write_range_helper(&c->range, fp);
2955 if (rc)
2956 return rc;
2957
2958 return 0;
2959}
2960
2961/*
2962 * The following *_write functions are used to
2963 * write the symbol data to a policy database
2964 * binary representation file.
2965 */
2966
2967static int perm_write(void *vkey, void *datum, void *fp)
2968{
2969 char *key = vkey;
2970 struct perm_datum *perdatum = datum;
2971 __le32 buf[2];
2972 size_t len;
2973 int rc;
2974
2975 len = strlen(key);
2976 buf[0] = cpu_to_le32(len);
2977 buf[1] = cpu_to_le32(perdatum->value);
2978 rc = put_entry(buf, sizeof(u32), 2, fp);
2979 if (rc)
2980 return rc;
2981
2982 rc = put_entry(key, 1, len, fp);
2983 if (rc)
2984 return rc;
2985
2986 return 0;
2987}
2988
2989static int common_write(void *vkey, void *datum, void *ptr)
2990{
2991 char *key = vkey;
2992 struct common_datum *comdatum = datum;
2993 struct policy_data *pd = ptr;
2994 void *fp = pd->fp;
2995 __le32 buf[4];
2996 size_t len;
2997 int rc;
2998
2999 len = strlen(key);
3000 buf[0] = cpu_to_le32(len);
3001 buf[1] = cpu_to_le32(comdatum->value);
3002 buf[2] = cpu_to_le32(comdatum->permissions.nprim);
3003 buf[3] = cpu_to_le32(comdatum->permissions.table.nel);
3004 rc = put_entry(buf, sizeof(u32), 4, fp);
3005 if (rc)
3006 return rc;
3007
3008 rc = put_entry(key, 1, len, fp);
3009 if (rc)
3010 return rc;
3011
3012 rc = hashtab_map(&comdatum->permissions.table, perm_write, fp);
3013 if (rc)
3014 return rc;
3015
3016 return 0;
3017}
3018
3019static int type_set_write(struct type_set *t, void *fp)
3020{
3021 int rc;
3022 __le32 buf[1];
3023
3024 if (ebitmap_write(&t->types, fp))
3025 return -EINVAL;
3026 if (ebitmap_write(&t->negset, fp))
3027 return -EINVAL;
3028
3029 buf[0] = cpu_to_le32(t->flags);
3030 rc = put_entry(buf, sizeof(u32), 1, fp);
3031 if (rc)
3032 return -EINVAL;
3033
3034 return 0;
3035}
3036
3037static int write_cons_helper(struct policydb *p, struct constraint_node *node,
3038 void *fp)
3039{
3040 struct constraint_node *c;
3041 struct constraint_expr *e;
3042 __le32 buf[3];
3043 u32 nel;
3044 int rc;
3045
3046 for (c = node; c; c = c->next) {
3047 nel = 0;
3048 for (e = c->expr; e; e = e->next)
3049 nel++;
3050 buf[0] = cpu_to_le32(c->permissions);
3051 buf[1] = cpu_to_le32(nel);
3052 rc = put_entry(buf, sizeof(u32), 2, fp);
3053 if (rc)
3054 return rc;
3055 for (e = c->expr; e; e = e->next) {
3056 buf[0] = cpu_to_le32(e->expr_type);
3057 buf[1] = cpu_to_le32(e->attr);
3058 buf[2] = cpu_to_le32(e->op);
3059 rc = put_entry(buf, sizeof(u32), 3, fp);
3060 if (rc)
3061 return rc;
3062
3063 switch (e->expr_type) {
3064 case CEXPR_NAMES:
3065 rc = ebitmap_write(&e->names, fp);
3066 if (rc)
3067 return rc;
3068 if (p->policyvers >=
3069 POLICYDB_VERSION_CONSTRAINT_NAMES) {
3070 rc = type_set_write(e->type_names, fp);
3071 if (rc)
3072 return rc;
3073 }
3074 break;
3075 default:
3076 break;
3077 }
3078 }
3079 }
3080
3081 return 0;
3082}
3083
3084static int class_write(void *vkey, void *datum, void *ptr)
3085{
3086 char *key = vkey;
3087 struct class_datum *cladatum = datum;
3088 struct policy_data *pd = ptr;
3089 void *fp = pd->fp;
3090 struct policydb *p = pd->p;
3091 struct constraint_node *c;
3092 __le32 buf[6];
3093 u32 ncons;
3094 size_t len, len2;
3095 int rc;
3096
3097 len = strlen(key);
3098 if (cladatum->comkey)
3099 len2 = strlen(cladatum->comkey);
3100 else
3101 len2 = 0;
3102
3103 ncons = 0;
3104 for (c = cladatum->constraints; c; c = c->next)
3105 ncons++;
3106
3107 buf[0] = cpu_to_le32(len);
3108 buf[1] = cpu_to_le32(len2);
3109 buf[2] = cpu_to_le32(cladatum->value);
3110 buf[3] = cpu_to_le32(cladatum->permissions.nprim);
3111 buf[4] = cpu_to_le32(cladatum->permissions.table.nel);
3112 buf[5] = cpu_to_le32(ncons);
3113 rc = put_entry(buf, sizeof(u32), 6, fp);
3114 if (rc)
3115 return rc;
3116
3117 rc = put_entry(key, 1, len, fp);
3118 if (rc)
3119 return rc;
3120
3121 if (cladatum->comkey) {
3122 rc = put_entry(cladatum->comkey, 1, len2, fp);
3123 if (rc)
3124 return rc;
3125 }
3126
3127 rc = hashtab_map(&cladatum->permissions.table, perm_write, fp);
3128 if (rc)
3129 return rc;
3130
3131 rc = write_cons_helper(p, cladatum->constraints, fp);
3132 if (rc)
3133 return rc;
3134
3135 /* write out the validatetrans rule */
3136 ncons = 0;
3137 for (c = cladatum->validatetrans; c; c = c->next)
3138 ncons++;
3139
3140 buf[0] = cpu_to_le32(ncons);
3141 rc = put_entry(buf, sizeof(u32), 1, fp);
3142 if (rc)
3143 return rc;
3144
3145 rc = write_cons_helper(p, cladatum->validatetrans, fp);
3146 if (rc)
3147 return rc;
3148
3149 if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
3150 buf[0] = cpu_to_le32(cladatum->default_user);
3151 buf[1] = cpu_to_le32(cladatum->default_role);
3152 buf[2] = cpu_to_le32(cladatum->default_range);
3153
3154 rc = put_entry(buf, sizeof(uint32_t), 3, fp);
3155 if (rc)
3156 return rc;
3157 }
3158
3159 if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
3160 buf[0] = cpu_to_le32(cladatum->default_type);
3161 rc = put_entry(buf, sizeof(uint32_t), 1, fp);
3162 if (rc)
3163 return rc;
3164 }
3165
3166 return 0;
3167}
3168
3169static int role_write(void *vkey, void *datum, void *ptr)
3170{
3171 char *key = vkey;
3172 struct role_datum *role = datum;
3173 struct policy_data *pd = ptr;
3174 void *fp = pd->fp;
3175 struct policydb *p = pd->p;
3176 __le32 buf[3];
3177 size_t items, len;
3178 int rc;
3179
3180 len = strlen(key);
3181 items = 0;
3182 buf[items++] = cpu_to_le32(len);
3183 buf[items++] = cpu_to_le32(role->value);
3184 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
3185 buf[items++] = cpu_to_le32(role->bounds);
3186
3187 BUG_ON(items > ARRAY_SIZE(buf));
3188
3189 rc = put_entry(buf, sizeof(u32), items, fp);
3190 if (rc)
3191 return rc;
3192
3193 rc = put_entry(key, 1, len, fp);
3194 if (rc)
3195 return rc;
3196
3197 rc = ebitmap_write(&role->dominates, fp);
3198 if (rc)
3199 return rc;
3200
3201 rc = ebitmap_write(&role->types, fp);
3202 if (rc)
3203 return rc;
3204
3205 return 0;
3206}
3207
3208static int type_write(void *vkey, void *datum, void *ptr)
3209{
3210 char *key = vkey;
3211 struct type_datum *typdatum = datum;
3212 struct policy_data *pd = ptr;
3213 struct policydb *p = pd->p;
3214 void *fp = pd->fp;
3215 __le32 buf[4];
3216 int rc;
3217 size_t items, len;
3218
3219 len = strlen(key);
3220 items = 0;
3221 buf[items++] = cpu_to_le32(len);
3222 buf[items++] = cpu_to_le32(typdatum->value);
3223 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
3224 u32 properties = 0;
3225
3226 if (typdatum->primary)
3227 properties |= TYPEDATUM_PROPERTY_PRIMARY;
3228
3229 if (typdatum->attribute)
3230 properties |= TYPEDATUM_PROPERTY_ATTRIBUTE;
3231
3232 buf[items++] = cpu_to_le32(properties);
3233 buf[items++] = cpu_to_le32(typdatum->bounds);
3234 } else {
3235 buf[items++] = cpu_to_le32(typdatum->primary);
3236 }
3237 BUG_ON(items > ARRAY_SIZE(buf));
3238 rc = put_entry(buf, sizeof(u32), items, fp);
3239 if (rc)
3240 return rc;
3241
3242 rc = put_entry(key, 1, len, fp);
3243 if (rc)
3244 return rc;
3245
3246 return 0;
3247}
3248
3249static int user_write(void *vkey, void *datum, void *ptr)
3250{
3251 char *key = vkey;
3252 struct user_datum *usrdatum = datum;
3253 struct policy_data *pd = ptr;
3254 struct policydb *p = pd->p;
3255 void *fp = pd->fp;
3256 __le32 buf[3];
3257 size_t items, len;
3258 int rc;
3259
3260 len = strlen(key);
3261 items = 0;
3262 buf[items++] = cpu_to_le32(len);
3263 buf[items++] = cpu_to_le32(usrdatum->value);
3264 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
3265 buf[items++] = cpu_to_le32(usrdatum->bounds);
3266 BUG_ON(items > ARRAY_SIZE(buf));
3267 rc = put_entry(buf, sizeof(u32), items, fp);
3268 if (rc)
3269 return rc;
3270
3271 rc = put_entry(key, 1, len, fp);
3272 if (rc)
3273 return rc;
3274
3275 rc = ebitmap_write(&usrdatum->roles, fp);
3276 if (rc)
3277 return rc;
3278
3279 rc = mls_write_range_helper(&usrdatum->range, fp);
3280 if (rc)
3281 return rc;
3282
3283 rc = mls_write_level(&usrdatum->dfltlevel, fp);
3284 if (rc)
3285 return rc;
3286
3287 return 0;
3288}
3289
3290/* clang-format off */
3291static int (*const write_f[SYM_NUM])(void *key, void *datum, void *datap) = {
3292 common_write,
3293 class_write,
3294 role_write,
3295 type_write,
3296 user_write,
3297 cond_write_bool,
3298 sens_write,
3299 cat_write,
3300};
3301/* clang-format on */
3302
3303static int ocontext_write(struct policydb *p,
3304 const struct policydb_compat_info *info, void *fp)
3305{
3306 unsigned int i, j;
3307 int rc;
3308 size_t nel, len;
3309 __be64 prefixbuf[1];
3310 __le32 buf[3];
3311 u32 nodebuf[8];
3312 struct ocontext *c;
3313 for (i = 0; i < info->ocon_num; i++) {
3314 nel = 0;
3315 for (c = p->ocontexts[i]; c; c = c->next)
3316 nel++;
3317 buf[0] = cpu_to_le32(nel);
3318 rc = put_entry(buf, sizeof(u32), 1, fp);
3319 if (rc)
3320 return rc;
3321 for (c = p->ocontexts[i]; c; c = c->next) {
3322 switch (i) {
3323 case OCON_ISID:
3324 buf[0] = cpu_to_le32(c->sid[0]);
3325 rc = put_entry(buf, sizeof(u32), 1, fp);
3326 if (rc)
3327 return rc;
3328 rc = context_write(p, &c->context[0], fp);
3329 if (rc)
3330 return rc;
3331 break;
3332 case OCON_FS:
3333 case OCON_NETIF:
3334 len = strlen(c->u.name);
3335 buf[0] = cpu_to_le32(len);
3336 rc = put_entry(buf, sizeof(u32), 1, fp);
3337 if (rc)
3338 return rc;
3339 rc = put_entry(c->u.name, 1, len, fp);
3340 if (rc)
3341 return rc;
3342 rc = context_write(p, &c->context[0], fp);
3343 if (rc)
3344 return rc;
3345 rc = context_write(p, &c->context[1], fp);
3346 if (rc)
3347 return rc;
3348 break;
3349 case OCON_PORT:
3350 buf[0] = cpu_to_le32(c->u.port.protocol);
3351 buf[1] = cpu_to_le32(c->u.port.low_port);
3352 buf[2] = cpu_to_le32(c->u.port.high_port);
3353 rc = put_entry(buf, sizeof(u32), 3, fp);
3354 if (rc)
3355 return rc;
3356 rc = context_write(p, &c->context[0], fp);
3357 if (rc)
3358 return rc;
3359 break;
3360 case OCON_NODE:
3361 nodebuf[0] = c->u.node.addr; /* network order */
3362 nodebuf[1] = c->u.node.mask; /* network order */
3363 rc = put_entry(nodebuf, sizeof(u32), 2, fp);
3364 if (rc)
3365 return rc;
3366 rc = context_write(p, &c->context[0], fp);
3367 if (rc)
3368 return rc;
3369 break;
3370 case OCON_FSUSE:
3371 buf[0] = cpu_to_le32(c->v.behavior);
3372 len = strlen(c->u.name);
3373 buf[1] = cpu_to_le32(len);
3374 rc = put_entry(buf, sizeof(u32), 2, fp);
3375 if (rc)
3376 return rc;
3377 rc = put_entry(c->u.name, 1, len, fp);
3378 if (rc)
3379 return rc;
3380 rc = context_write(p, &c->context[0], fp);
3381 if (rc)
3382 return rc;
3383 break;
3384 case OCON_NODE6:
3385 for (j = 0; j < 4; j++)
3386 nodebuf[j] =
3387 c->u.node6.addr
3388 [j]; /* network order */
3389 for (j = 0; j < 4; j++)
3390 nodebuf[j + 4] =
3391 c->u.node6.mask
3392 [j]; /* network order */
3393 rc = put_entry(nodebuf, sizeof(u32), 8, fp);
3394 if (rc)
3395 return rc;
3396 rc = context_write(p, &c->context[0], fp);
3397 if (rc)
3398 return rc;
3399 break;
3400 case OCON_IBPKEY:
3401 /* subnet_prefix is in CPU order */
3402 prefixbuf[0] =
3403 cpu_to_be64(c->u.ibpkey.subnet_prefix);
3404
3405 rc = put_entry(prefixbuf, sizeof(u64), 1, fp);
3406 if (rc)
3407 return rc;
3408
3409 buf[0] = cpu_to_le32(c->u.ibpkey.low_pkey);
3410 buf[1] = cpu_to_le32(c->u.ibpkey.high_pkey);
3411
3412 rc = put_entry(buf, sizeof(u32), 2, fp);
3413 if (rc)
3414 return rc;
3415 rc = context_write(p, &c->context[0], fp);
3416 if (rc)
3417 return rc;
3418 break;
3419 case OCON_IBENDPORT:
3420 len = strlen(c->u.ibendport.dev_name);
3421 buf[0] = cpu_to_le32(len);
3422 buf[1] = cpu_to_le32(c->u.ibendport.port);
3423 rc = put_entry(buf, sizeof(u32), 2, fp);
3424 if (rc)
3425 return rc;
3426 rc = put_entry(c->u.ibendport.dev_name, 1, len,
3427 fp);
3428 if (rc)
3429 return rc;
3430 rc = context_write(p, &c->context[0], fp);
3431 if (rc)
3432 return rc;
3433 break;
3434 }
3435 }
3436 }
3437 return 0;
3438}
3439
3440static int genfs_write(struct policydb *p, void *fp)
3441{
3442 struct genfs *genfs;
3443 struct ocontext *c;
3444 size_t len;
3445 __le32 buf[1];
3446 int rc;
3447
3448 len = 0;
3449 for (genfs = p->genfs; genfs; genfs = genfs->next)
3450 len++;
3451 buf[0] = cpu_to_le32(len);
3452 rc = put_entry(buf, sizeof(u32), 1, fp);
3453 if (rc)
3454 return rc;
3455 for (genfs = p->genfs; genfs; genfs = genfs->next) {
3456 len = strlen(genfs->fstype);
3457 buf[0] = cpu_to_le32(len);
3458 rc = put_entry(buf, sizeof(u32), 1, fp);
3459 if (rc)
3460 return rc;
3461 rc = put_entry(genfs->fstype, 1, len, fp);
3462 if (rc)
3463 return rc;
3464 len = 0;
3465 for (c = genfs->head; c; c = c->next)
3466 len++;
3467 buf[0] = cpu_to_le32(len);
3468 rc = put_entry(buf, sizeof(u32), 1, fp);
3469 if (rc)
3470 return rc;
3471 for (c = genfs->head; c; c = c->next) {
3472 len = strlen(c->u.name);
3473 buf[0] = cpu_to_le32(len);
3474 rc = put_entry(buf, sizeof(u32), 1, fp);
3475 if (rc)
3476 return rc;
3477 rc = put_entry(c->u.name, 1, len, fp);
3478 if (rc)
3479 return rc;
3480 buf[0] = cpu_to_le32(c->v.sclass);
3481 rc = put_entry(buf, sizeof(u32), 1, fp);
3482 if (rc)
3483 return rc;
3484 rc = context_write(p, &c->context[0], fp);
3485 if (rc)
3486 return rc;
3487 }
3488 }
3489 return 0;
3490}
3491
3492static int range_write_helper(void *key, void *data, void *ptr)
3493{
3494 __le32 buf[2];
3495 struct range_trans *rt = key;
3496 struct mls_range *r = data;
3497 struct policy_data *pd = ptr;
3498 void *fp = pd->fp;
3499 struct policydb *p = pd->p;
3500 int rc;
3501
3502 buf[0] = cpu_to_le32(rt->source_type);
3503 buf[1] = cpu_to_le32(rt->target_type);
3504 rc = put_entry(buf, sizeof(u32), 2, fp);
3505 if (rc)
3506 return rc;
3507 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
3508 buf[0] = cpu_to_le32(rt->target_class);
3509 rc = put_entry(buf, sizeof(u32), 1, fp);
3510 if (rc)
3511 return rc;
3512 }
3513 rc = mls_write_range_helper(r, fp);
3514 if (rc)
3515 return rc;
3516
3517 return 0;
3518}
3519
3520static int range_write(struct policydb *p, void *fp)
3521{
3522 __le32 buf[1];
3523 int rc;
3524 struct policy_data pd;
3525
3526 pd.p = p;
3527 pd.fp = fp;
3528
3529 buf[0] = cpu_to_le32(p->range_tr.nel);
3530 rc = put_entry(buf, sizeof(u32), 1, fp);
3531 if (rc)
3532 return rc;
3533
3534 /* actually write all of the entries */
3535 rc = hashtab_map(&p->range_tr, range_write_helper, &pd);
3536 if (rc)
3537 return rc;
3538
3539 return 0;
3540}
3541
3542static int filename_write_helper_compat(void *key, void *data, void *ptr)
3543{
3544 struct filename_trans_key *ft = key;
3545 struct filename_trans_datum *datum = data;
3546 struct ebitmap_node *node;
3547 void *fp = ptr;
3548 __le32 buf[4];
3549 int rc;
3550 u32 bit, len = strlen(ft->name);
3551
3552 do {
3553 ebitmap_for_each_positive_bit(&datum->stypes, node, bit)
3554 {
3555 buf[0] = cpu_to_le32(len);
3556 rc = put_entry(buf, sizeof(u32), 1, fp);
3557 if (rc)
3558 return rc;
3559
3560 rc = put_entry(ft->name, sizeof(char), len, fp);
3561 if (rc)
3562 return rc;
3563
3564 buf[0] = cpu_to_le32(bit + 1);
3565 buf[1] = cpu_to_le32(ft->ttype);
3566 buf[2] = cpu_to_le32(ft->tclass);
3567 buf[3] = cpu_to_le32(datum->otype);
3568
3569 rc = put_entry(buf, sizeof(u32), 4, fp);
3570 if (rc)
3571 return rc;
3572 }
3573
3574 datum = datum->next;
3575 } while (unlikely(datum));
3576
3577 return 0;
3578}
3579
3580static int filename_write_helper(void *key, void *data, void *ptr)
3581{
3582 struct filename_trans_key *ft = key;
3583 struct filename_trans_datum *datum;
3584 void *fp = ptr;
3585 __le32 buf[3];
3586 int rc;
3587 u32 ndatum, len = strlen(ft->name);
3588
3589 buf[0] = cpu_to_le32(len);
3590 rc = put_entry(buf, sizeof(u32), 1, fp);
3591 if (rc)
3592 return rc;
3593
3594 rc = put_entry(ft->name, sizeof(char), len, fp);
3595 if (rc)
3596 return rc;
3597
3598 ndatum = 0;
3599 datum = data;
3600 do {
3601 ndatum++;
3602 datum = datum->next;
3603 } while (unlikely(datum));
3604
3605 buf[0] = cpu_to_le32(ft->ttype);
3606 buf[1] = cpu_to_le32(ft->tclass);
3607 buf[2] = cpu_to_le32(ndatum);
3608 rc = put_entry(buf, sizeof(u32), 3, fp);
3609 if (rc)
3610 return rc;
3611
3612 datum = data;
3613 do {
3614 rc = ebitmap_write(&datum->stypes, fp);
3615 if (rc)
3616 return rc;
3617
3618 buf[0] = cpu_to_le32(datum->otype);
3619 rc = put_entry(buf, sizeof(u32), 1, fp);
3620 if (rc)
3621 return rc;
3622
3623 datum = datum->next;
3624 } while (unlikely(datum));
3625
3626 return 0;
3627}
3628
3629static int filename_trans_write(struct policydb *p, void *fp)
3630{
3631 __le32 buf[1];
3632 int rc;
3633
3634 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
3635 return 0;
3636
3637 if (p->policyvers < POLICYDB_VERSION_COMP_FTRANS) {
3638 buf[0] = cpu_to_le32(p->compat_filename_trans_count);
3639 rc = put_entry(buf, sizeof(u32), 1, fp);
3640 if (rc)
3641 return rc;
3642
3643 rc = hashtab_map(&p->filename_trans,
3644 filename_write_helper_compat, fp);
3645 } else {
3646 buf[0] = cpu_to_le32(p->filename_trans.nel);
3647 rc = put_entry(buf, sizeof(u32), 1, fp);
3648 if (rc)
3649 return rc;
3650
3651 rc = hashtab_map(&p->filename_trans, filename_write_helper, fp);
3652 }
3653 return rc;
3654}
3655
3656/*
3657 * Write the configuration data in a policy database
3658 * structure to a policy database binary representation
3659 * file.
3660 */
3661int policydb_write(struct policydb *p, void *fp)
3662{
3663 unsigned int num_syms;
3664 int rc;
3665 __le32 buf[4];
3666 u32 config, i;
3667 size_t len;
3668 const struct policydb_compat_info *info;
3669
3670 /*
3671 * refuse to write policy older than compressed avtab
3672 * to simplify the writer. There are other tests dropped
3673 * since we assume this throughout the writer code. Be
3674 * careful if you ever try to remove this restriction
3675 */
3676 if (p->policyvers < POLICYDB_VERSION_AVTAB) {
3677 pr_err("SELinux: refusing to write policy version %d."
3678 " Because it is less than version %d\n",
3679 p->policyvers, POLICYDB_VERSION_AVTAB);
3680 return -EINVAL;
3681 }
3682
3683 config = 0;
3684 if (p->mls_enabled)
3685 config |= POLICYDB_CONFIG_MLS;
3686
3687 if (p->reject_unknown)
3688 config |= REJECT_UNKNOWN;
3689 if (p->allow_unknown)
3690 config |= ALLOW_UNKNOWN;
3691
3692 /* Write the magic number and string identifiers. */
3693 buf[0] = cpu_to_le32(POLICYDB_MAGIC);
3694 len = strlen(POLICYDB_STRING);
3695 buf[1] = cpu_to_le32(len);
3696 rc = put_entry(buf, sizeof(u32), 2, fp);
3697 if (rc)
3698 return rc;
3699 rc = put_entry(POLICYDB_STRING, 1, len, fp);
3700 if (rc)
3701 return rc;
3702
3703 /* Write the version, config, and table sizes. */
3704 info = policydb_lookup_compat(p->policyvers);
3705 if (!info) {
3706 pr_err("SELinux: compatibility lookup failed for policy "
3707 "version %d\n",
3708 p->policyvers);
3709 return -EINVAL;
3710 }
3711
3712 buf[0] = cpu_to_le32(p->policyvers);
3713 buf[1] = cpu_to_le32(config);
3714 buf[2] = cpu_to_le32(info->sym_num);
3715 buf[3] = cpu_to_le32(info->ocon_num);
3716
3717 rc = put_entry(buf, sizeof(u32), 4, fp);
3718 if (rc)
3719 return rc;
3720
3721 if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
3722 rc = ebitmap_write(&p->policycaps, fp);
3723 if (rc)
3724 return rc;
3725 }
3726
3727 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
3728 rc = ebitmap_write(&p->permissive_map, fp);
3729 if (rc)
3730 return rc;
3731 }
3732
3733 num_syms = info->sym_num;
3734 for (i = 0; i < num_syms; i++) {
3735 struct policy_data pd;
3736
3737 pd.fp = fp;
3738 pd.p = p;
3739
3740 buf[0] = cpu_to_le32(p->symtab[i].nprim);
3741 buf[1] = cpu_to_le32(p->symtab[i].table.nel);
3742
3743 rc = put_entry(buf, sizeof(u32), 2, fp);
3744 if (rc)
3745 return rc;
3746 rc = hashtab_map(&p->symtab[i].table, write_f[i], &pd);
3747 if (rc)
3748 return rc;
3749 }
3750
3751 rc = avtab_write(p, &p->te_avtab, fp);
3752 if (rc)
3753 return rc;
3754
3755 rc = cond_write_list(p, fp);
3756 if (rc)
3757 return rc;
3758
3759 rc = role_trans_write(p, fp);
3760 if (rc)
3761 return rc;
3762
3763 rc = role_allow_write(p->role_allow, fp);
3764 if (rc)
3765 return rc;
3766
3767 rc = filename_trans_write(p, fp);
3768 if (rc)
3769 return rc;
3770
3771 rc = ocontext_write(p, info, fp);
3772 if (rc)
3773 return rc;
3774
3775 rc = genfs_write(p, fp);
3776 if (rc)
3777 return rc;
3778
3779 rc = range_write(p, fp);
3780 if (rc)
3781 return rc;
3782
3783 for (i = 0; i < p->p_types.nprim; i++) {
3784 struct ebitmap *e = &p->type_attr_map_array[i];
3785
3786 rc = ebitmap_write(e, fp);
3787 if (rc)
3788 return rc;
3789 }
3790
3791 return 0;
3792}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Implementation of the policy database.
4 *
5 * Author : Stephen Smalley, <sds@tycho.nsa.gov>
6 */
7
8/*
9 * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
10 *
11 * Support for enhanced MLS infrastructure.
12 *
13 * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
14 *
15 * Added conditional policy language extensions
16 *
17 * Updated: Hewlett-Packard <paul@paul-moore.com>
18 *
19 * Added support for the policy capability bitmap
20 *
21 * Update: Mellanox Techonologies
22 *
23 * Added Infiniband support
24 *
25 * Copyright (C) 2016 Mellanox Techonologies
26 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
27 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
28 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
29 */
30
31#include <linux/kernel.h>
32#include <linux/sched.h>
33#include <linux/slab.h>
34#include <linux/string.h>
35#include <linux/errno.h>
36#include <linux/audit.h>
37#include "security.h"
38
39#include "policydb.h"
40#include "conditional.h"
41#include "mls.h"
42#include "services.h"
43
44#define _DEBUG_HASHES
45
46#ifdef DEBUG_HASHES
47static const char *symtab_name[SYM_NUM] = {
48 "common prefixes",
49 "classes",
50 "roles",
51 "types",
52 "users",
53 "bools",
54 "levels",
55 "categories",
56};
57#endif
58
59static unsigned int symtab_sizes[SYM_NUM] = {
60 2,
61 32,
62 16,
63 512,
64 128,
65 16,
66 16,
67 16,
68};
69
70struct policydb_compat_info {
71 int version;
72 int sym_num;
73 int ocon_num;
74};
75
76/* These need to be updated if SYM_NUM or OCON_NUM changes */
77static struct policydb_compat_info policydb_compat[] = {
78 {
79 .version = POLICYDB_VERSION_BASE,
80 .sym_num = SYM_NUM - 3,
81 .ocon_num = OCON_NUM - 3,
82 },
83 {
84 .version = POLICYDB_VERSION_BOOL,
85 .sym_num = SYM_NUM - 2,
86 .ocon_num = OCON_NUM - 3,
87 },
88 {
89 .version = POLICYDB_VERSION_IPV6,
90 .sym_num = SYM_NUM - 2,
91 .ocon_num = OCON_NUM - 2,
92 },
93 {
94 .version = POLICYDB_VERSION_NLCLASS,
95 .sym_num = SYM_NUM - 2,
96 .ocon_num = OCON_NUM - 2,
97 },
98 {
99 .version = POLICYDB_VERSION_MLS,
100 .sym_num = SYM_NUM,
101 .ocon_num = OCON_NUM - 2,
102 },
103 {
104 .version = POLICYDB_VERSION_AVTAB,
105 .sym_num = SYM_NUM,
106 .ocon_num = OCON_NUM - 2,
107 },
108 {
109 .version = POLICYDB_VERSION_RANGETRANS,
110 .sym_num = SYM_NUM,
111 .ocon_num = OCON_NUM - 2,
112 },
113 {
114 .version = POLICYDB_VERSION_POLCAP,
115 .sym_num = SYM_NUM,
116 .ocon_num = OCON_NUM - 2,
117 },
118 {
119 .version = POLICYDB_VERSION_PERMISSIVE,
120 .sym_num = SYM_NUM,
121 .ocon_num = OCON_NUM - 2,
122 },
123 {
124 .version = POLICYDB_VERSION_BOUNDARY,
125 .sym_num = SYM_NUM,
126 .ocon_num = OCON_NUM - 2,
127 },
128 {
129 .version = POLICYDB_VERSION_FILENAME_TRANS,
130 .sym_num = SYM_NUM,
131 .ocon_num = OCON_NUM - 2,
132 },
133 {
134 .version = POLICYDB_VERSION_ROLETRANS,
135 .sym_num = SYM_NUM,
136 .ocon_num = OCON_NUM - 2,
137 },
138 {
139 .version = POLICYDB_VERSION_NEW_OBJECT_DEFAULTS,
140 .sym_num = SYM_NUM,
141 .ocon_num = OCON_NUM - 2,
142 },
143 {
144 .version = POLICYDB_VERSION_DEFAULT_TYPE,
145 .sym_num = SYM_NUM,
146 .ocon_num = OCON_NUM - 2,
147 },
148 {
149 .version = POLICYDB_VERSION_CONSTRAINT_NAMES,
150 .sym_num = SYM_NUM,
151 .ocon_num = OCON_NUM - 2,
152 },
153 {
154 .version = POLICYDB_VERSION_XPERMS_IOCTL,
155 .sym_num = SYM_NUM,
156 .ocon_num = OCON_NUM - 2,
157 },
158 {
159 .version = POLICYDB_VERSION_INFINIBAND,
160 .sym_num = SYM_NUM,
161 .ocon_num = OCON_NUM,
162 },
163};
164
165static struct policydb_compat_info *policydb_lookup_compat(int version)
166{
167 int i;
168 struct policydb_compat_info *info = NULL;
169
170 for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) {
171 if (policydb_compat[i].version == version) {
172 info = &policydb_compat[i];
173 break;
174 }
175 }
176 return info;
177}
178
179/*
180 * The following *_destroy functions are used to
181 * free any memory allocated for each kind of
182 * symbol data in the policy database.
183 */
184
185static int perm_destroy(void *key, void *datum, void *p)
186{
187 kfree(key);
188 kfree(datum);
189 return 0;
190}
191
192static int common_destroy(void *key, void *datum, void *p)
193{
194 struct common_datum *comdatum;
195
196 kfree(key);
197 if (datum) {
198 comdatum = datum;
199 hashtab_map(comdatum->permissions.table, perm_destroy, NULL);
200 hashtab_destroy(comdatum->permissions.table);
201 }
202 kfree(datum);
203 return 0;
204}
205
206static void constraint_expr_destroy(struct constraint_expr *expr)
207{
208 if (expr) {
209 ebitmap_destroy(&expr->names);
210 if (expr->type_names) {
211 ebitmap_destroy(&expr->type_names->types);
212 ebitmap_destroy(&expr->type_names->negset);
213 kfree(expr->type_names);
214 }
215 kfree(expr);
216 }
217}
218
219static int cls_destroy(void *key, void *datum, void *p)
220{
221 struct class_datum *cladatum;
222 struct constraint_node *constraint, *ctemp;
223 struct constraint_expr *e, *etmp;
224
225 kfree(key);
226 if (datum) {
227 cladatum = datum;
228 hashtab_map(cladatum->permissions.table, perm_destroy, NULL);
229 hashtab_destroy(cladatum->permissions.table);
230 constraint = cladatum->constraints;
231 while (constraint) {
232 e = constraint->expr;
233 while (e) {
234 etmp = e;
235 e = e->next;
236 constraint_expr_destroy(etmp);
237 }
238 ctemp = constraint;
239 constraint = constraint->next;
240 kfree(ctemp);
241 }
242
243 constraint = cladatum->validatetrans;
244 while (constraint) {
245 e = constraint->expr;
246 while (e) {
247 etmp = e;
248 e = e->next;
249 constraint_expr_destroy(etmp);
250 }
251 ctemp = constraint;
252 constraint = constraint->next;
253 kfree(ctemp);
254 }
255 kfree(cladatum->comkey);
256 }
257 kfree(datum);
258 return 0;
259}
260
261static int role_destroy(void *key, void *datum, void *p)
262{
263 struct role_datum *role;
264
265 kfree(key);
266 if (datum) {
267 role = datum;
268 ebitmap_destroy(&role->dominates);
269 ebitmap_destroy(&role->types);
270 }
271 kfree(datum);
272 return 0;
273}
274
275static int type_destroy(void *key, void *datum, void *p)
276{
277 kfree(key);
278 kfree(datum);
279 return 0;
280}
281
282static int user_destroy(void *key, void *datum, void *p)
283{
284 struct user_datum *usrdatum;
285
286 kfree(key);
287 if (datum) {
288 usrdatum = datum;
289 ebitmap_destroy(&usrdatum->roles);
290 ebitmap_destroy(&usrdatum->range.level[0].cat);
291 ebitmap_destroy(&usrdatum->range.level[1].cat);
292 ebitmap_destroy(&usrdatum->dfltlevel.cat);
293 }
294 kfree(datum);
295 return 0;
296}
297
298static int sens_destroy(void *key, void *datum, void *p)
299{
300 struct level_datum *levdatum;
301
302 kfree(key);
303 if (datum) {
304 levdatum = datum;
305 if (levdatum->level)
306 ebitmap_destroy(&levdatum->level->cat);
307 kfree(levdatum->level);
308 }
309 kfree(datum);
310 return 0;
311}
312
313static int cat_destroy(void *key, void *datum, void *p)
314{
315 kfree(key);
316 kfree(datum);
317 return 0;
318}
319
320static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) =
321{
322 common_destroy,
323 cls_destroy,
324 role_destroy,
325 type_destroy,
326 user_destroy,
327 cond_destroy_bool,
328 sens_destroy,
329 cat_destroy,
330};
331
332static int filenametr_destroy(void *key, void *datum, void *p)
333{
334 struct filename_trans *ft = key;
335
336 kfree(ft->name);
337 kfree(key);
338 kfree(datum);
339 cond_resched();
340 return 0;
341}
342
343static int range_tr_destroy(void *key, void *datum, void *p)
344{
345 struct mls_range *rt = datum;
346
347 kfree(key);
348 ebitmap_destroy(&rt->level[0].cat);
349 ebitmap_destroy(&rt->level[1].cat);
350 kfree(datum);
351 cond_resched();
352 return 0;
353}
354
355static void ocontext_destroy(struct ocontext *c, int i)
356{
357 if (!c)
358 return;
359
360 context_destroy(&c->context[0]);
361 context_destroy(&c->context[1]);
362 if (i == OCON_ISID || i == OCON_FS ||
363 i == OCON_NETIF || i == OCON_FSUSE)
364 kfree(c->u.name);
365 kfree(c);
366}
367
368/*
369 * Initialize the role table.
370 */
371static int roles_init(struct policydb *p)
372{
373 char *key = NULL;
374 int rc;
375 struct role_datum *role;
376
377 role = kzalloc(sizeof(*role), GFP_KERNEL);
378 if (!role)
379 return -ENOMEM;
380
381 rc = -EINVAL;
382 role->value = ++p->p_roles.nprim;
383 if (role->value != OBJECT_R_VAL)
384 goto out;
385
386 rc = -ENOMEM;
387 key = kstrdup(OBJECT_R, GFP_KERNEL);
388 if (!key)
389 goto out;
390
391 rc = hashtab_insert(p->p_roles.table, key, role);
392 if (rc)
393 goto out;
394
395 return 0;
396out:
397 kfree(key);
398 kfree(role);
399 return rc;
400}
401
402static u32 filenametr_hash(struct hashtab *h, const void *k)
403{
404 const struct filename_trans *ft = k;
405 unsigned long hash;
406 unsigned int byte_num;
407 unsigned char focus;
408
409 hash = ft->stype ^ ft->ttype ^ ft->tclass;
410
411 byte_num = 0;
412 while ((focus = ft->name[byte_num++]))
413 hash = partial_name_hash(focus, hash);
414 return hash & (h->size - 1);
415}
416
417static int filenametr_cmp(struct hashtab *h, const void *k1, const void *k2)
418{
419 const struct filename_trans *ft1 = k1;
420 const struct filename_trans *ft2 = k2;
421 int v;
422
423 v = ft1->stype - ft2->stype;
424 if (v)
425 return v;
426
427 v = ft1->ttype - ft2->ttype;
428 if (v)
429 return v;
430
431 v = ft1->tclass - ft2->tclass;
432 if (v)
433 return v;
434
435 return strcmp(ft1->name, ft2->name);
436
437}
438
439static u32 rangetr_hash(struct hashtab *h, const void *k)
440{
441 const struct range_trans *key = k;
442
443 return (key->source_type + (key->target_type << 3) +
444 (key->target_class << 5)) & (h->size - 1);
445}
446
447static int rangetr_cmp(struct hashtab *h, const void *k1, const void *k2)
448{
449 const struct range_trans *key1 = k1, *key2 = k2;
450 int v;
451
452 v = key1->source_type - key2->source_type;
453 if (v)
454 return v;
455
456 v = key1->target_type - key2->target_type;
457 if (v)
458 return v;
459
460 v = key1->target_class - key2->target_class;
461
462 return v;
463}
464
465/*
466 * Initialize a policy database structure.
467 */
468static int policydb_init(struct policydb *p)
469{
470 int i, rc;
471
472 memset(p, 0, sizeof(*p));
473
474 for (i = 0; i < SYM_NUM; i++) {
475 rc = symtab_init(&p->symtab[i], symtab_sizes[i]);
476 if (rc)
477 goto out;
478 }
479
480 rc = avtab_init(&p->te_avtab);
481 if (rc)
482 goto out;
483
484 rc = roles_init(p);
485 if (rc)
486 goto out;
487
488 rc = cond_policydb_init(p);
489 if (rc)
490 goto out;
491
492 p->filename_trans = hashtab_create(filenametr_hash, filenametr_cmp,
493 (1 << 10));
494 if (!p->filename_trans) {
495 rc = -ENOMEM;
496 goto out;
497 }
498
499 p->range_tr = hashtab_create(rangetr_hash, rangetr_cmp, 256);
500 if (!p->range_tr) {
501 rc = -ENOMEM;
502 goto out;
503 }
504
505 ebitmap_init(&p->filename_trans_ttypes);
506 ebitmap_init(&p->policycaps);
507 ebitmap_init(&p->permissive_map);
508
509 return 0;
510out:
511 hashtab_destroy(p->filename_trans);
512 hashtab_destroy(p->range_tr);
513 for (i = 0; i < SYM_NUM; i++) {
514 hashtab_map(p->symtab[i].table, destroy_f[i], NULL);
515 hashtab_destroy(p->symtab[i].table);
516 }
517 return rc;
518}
519
520/*
521 * The following *_index functions are used to
522 * define the val_to_name and val_to_struct arrays
523 * in a policy database structure. The val_to_name
524 * arrays are used when converting security context
525 * structures into string representations. The
526 * val_to_struct arrays are used when the attributes
527 * of a class, role, or user are needed.
528 */
529
530static int common_index(void *key, void *datum, void *datap)
531{
532 struct policydb *p;
533 struct common_datum *comdatum;
534
535 comdatum = datum;
536 p = datap;
537 if (!comdatum->value || comdatum->value > p->p_commons.nprim)
538 return -EINVAL;
539
540 p->sym_val_to_name[SYM_COMMONS][comdatum->value - 1] = key;
541
542 return 0;
543}
544
545static int class_index(void *key, void *datum, void *datap)
546{
547 struct policydb *p;
548 struct class_datum *cladatum;
549
550 cladatum = datum;
551 p = datap;
552 if (!cladatum->value || cladatum->value > p->p_classes.nprim)
553 return -EINVAL;
554
555 p->sym_val_to_name[SYM_CLASSES][cladatum->value - 1] = key;
556 p->class_val_to_struct[cladatum->value - 1] = cladatum;
557 return 0;
558}
559
560static int role_index(void *key, void *datum, void *datap)
561{
562 struct policydb *p;
563 struct role_datum *role;
564
565 role = datum;
566 p = datap;
567 if (!role->value
568 || role->value > p->p_roles.nprim
569 || role->bounds > p->p_roles.nprim)
570 return -EINVAL;
571
572 p->sym_val_to_name[SYM_ROLES][role->value - 1] = key;
573 p->role_val_to_struct[role->value - 1] = role;
574 return 0;
575}
576
577static int type_index(void *key, void *datum, void *datap)
578{
579 struct policydb *p;
580 struct type_datum *typdatum;
581
582 typdatum = datum;
583 p = datap;
584
585 if (typdatum->primary) {
586 if (!typdatum->value
587 || typdatum->value > p->p_types.nprim
588 || typdatum->bounds > p->p_types.nprim)
589 return -EINVAL;
590 p->sym_val_to_name[SYM_TYPES][typdatum->value - 1] = key;
591 p->type_val_to_struct[typdatum->value - 1] = typdatum;
592 }
593
594 return 0;
595}
596
597static int user_index(void *key, void *datum, void *datap)
598{
599 struct policydb *p;
600 struct user_datum *usrdatum;
601
602 usrdatum = datum;
603 p = datap;
604 if (!usrdatum->value
605 || usrdatum->value > p->p_users.nprim
606 || usrdatum->bounds > p->p_users.nprim)
607 return -EINVAL;
608
609 p->sym_val_to_name[SYM_USERS][usrdatum->value - 1] = key;
610 p->user_val_to_struct[usrdatum->value - 1] = usrdatum;
611 return 0;
612}
613
614static int sens_index(void *key, void *datum, void *datap)
615{
616 struct policydb *p;
617 struct level_datum *levdatum;
618
619 levdatum = datum;
620 p = datap;
621
622 if (!levdatum->isalias) {
623 if (!levdatum->level->sens ||
624 levdatum->level->sens > p->p_levels.nprim)
625 return -EINVAL;
626
627 p->sym_val_to_name[SYM_LEVELS][levdatum->level->sens - 1] = key;
628 }
629
630 return 0;
631}
632
633static int cat_index(void *key, void *datum, void *datap)
634{
635 struct policydb *p;
636 struct cat_datum *catdatum;
637
638 catdatum = datum;
639 p = datap;
640
641 if (!catdatum->isalias) {
642 if (!catdatum->value || catdatum->value > p->p_cats.nprim)
643 return -EINVAL;
644
645 p->sym_val_to_name[SYM_CATS][catdatum->value - 1] = key;
646 }
647
648 return 0;
649}
650
651static int (*index_f[SYM_NUM]) (void *key, void *datum, void *datap) =
652{
653 common_index,
654 class_index,
655 role_index,
656 type_index,
657 user_index,
658 cond_index_bool,
659 sens_index,
660 cat_index,
661};
662
663#ifdef DEBUG_HASHES
664static void hash_eval(struct hashtab *h, const char *hash_name)
665{
666 struct hashtab_info info;
667
668 hashtab_stat(h, &info);
669 pr_debug("SELinux: %s: %d entries and %d/%d buckets used, longest chain length %d\n",
670 hash_name, h->nel, info.slots_used, h->size,
671 info.max_chain_len);
672}
673
674static void symtab_hash_eval(struct symtab *s)
675{
676 int i;
677
678 for (i = 0; i < SYM_NUM; i++)
679 hash_eval(s[i].table, symtab_name[i]);
680}
681
682#else
683static inline void hash_eval(struct hashtab *h, char *hash_name)
684{
685}
686#endif
687
688/*
689 * Define the other val_to_name and val_to_struct arrays
690 * in a policy database structure.
691 *
692 * Caller must clean up on failure.
693 */
694static int policydb_index(struct policydb *p)
695{
696 int i, rc;
697
698 if (p->mls_enabled)
699 pr_debug("SELinux: %d users, %d roles, %d types, %d bools, %d sens, %d cats\n",
700 p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim,
701 p->p_bools.nprim, p->p_levels.nprim, p->p_cats.nprim);
702 else
703 pr_debug("SELinux: %d users, %d roles, %d types, %d bools\n",
704 p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim,
705 p->p_bools.nprim);
706
707 pr_debug("SELinux: %d classes, %d rules\n",
708 p->p_classes.nprim, p->te_avtab.nel);
709
710#ifdef DEBUG_HASHES
711 avtab_hash_eval(&p->te_avtab, "rules");
712 symtab_hash_eval(p->symtab);
713#endif
714
715 p->class_val_to_struct = kcalloc(p->p_classes.nprim,
716 sizeof(*p->class_val_to_struct),
717 GFP_KERNEL);
718 if (!p->class_val_to_struct)
719 return -ENOMEM;
720
721 p->role_val_to_struct = kcalloc(p->p_roles.nprim,
722 sizeof(*p->role_val_to_struct),
723 GFP_KERNEL);
724 if (!p->role_val_to_struct)
725 return -ENOMEM;
726
727 p->user_val_to_struct = kcalloc(p->p_users.nprim,
728 sizeof(*p->user_val_to_struct),
729 GFP_KERNEL);
730 if (!p->user_val_to_struct)
731 return -ENOMEM;
732
733 p->type_val_to_struct = kvcalloc(p->p_types.nprim,
734 sizeof(*p->type_val_to_struct),
735 GFP_KERNEL);
736 if (!p->type_val_to_struct)
737 return -ENOMEM;
738
739 rc = cond_init_bool_indexes(p);
740 if (rc)
741 goto out;
742
743 for (i = 0; i < SYM_NUM; i++) {
744 p->sym_val_to_name[i] = kvcalloc(p->symtab[i].nprim,
745 sizeof(char *),
746 GFP_KERNEL);
747 if (!p->sym_val_to_name[i])
748 return -ENOMEM;
749
750 rc = hashtab_map(p->symtab[i].table, index_f[i], p);
751 if (rc)
752 goto out;
753 }
754 rc = 0;
755out:
756 return rc;
757}
758
759/*
760 * Free any memory allocated by a policy database structure.
761 */
762void policydb_destroy(struct policydb *p)
763{
764 struct ocontext *c, *ctmp;
765 struct genfs *g, *gtmp;
766 int i;
767 struct role_allow *ra, *lra = NULL;
768 struct role_trans *tr, *ltr = NULL;
769
770 for (i = 0; i < SYM_NUM; i++) {
771 cond_resched();
772 hashtab_map(p->symtab[i].table, destroy_f[i], NULL);
773 hashtab_destroy(p->symtab[i].table);
774 }
775
776 for (i = 0; i < SYM_NUM; i++)
777 kvfree(p->sym_val_to_name[i]);
778
779 kfree(p->class_val_to_struct);
780 kfree(p->role_val_to_struct);
781 kfree(p->user_val_to_struct);
782 kvfree(p->type_val_to_struct);
783
784 avtab_destroy(&p->te_avtab);
785
786 for (i = 0; i < OCON_NUM; i++) {
787 cond_resched();
788 c = p->ocontexts[i];
789 while (c) {
790 ctmp = c;
791 c = c->next;
792 ocontext_destroy(ctmp, i);
793 }
794 p->ocontexts[i] = NULL;
795 }
796
797 g = p->genfs;
798 while (g) {
799 cond_resched();
800 kfree(g->fstype);
801 c = g->head;
802 while (c) {
803 ctmp = c;
804 c = c->next;
805 ocontext_destroy(ctmp, OCON_FSUSE);
806 }
807 gtmp = g;
808 g = g->next;
809 kfree(gtmp);
810 }
811 p->genfs = NULL;
812
813 cond_policydb_destroy(p);
814
815 for (tr = p->role_tr; tr; tr = tr->next) {
816 cond_resched();
817 kfree(ltr);
818 ltr = tr;
819 }
820 kfree(ltr);
821
822 for (ra = p->role_allow; ra; ra = ra->next) {
823 cond_resched();
824 kfree(lra);
825 lra = ra;
826 }
827 kfree(lra);
828
829 hashtab_map(p->filename_trans, filenametr_destroy, NULL);
830 hashtab_destroy(p->filename_trans);
831
832 hashtab_map(p->range_tr, range_tr_destroy, NULL);
833 hashtab_destroy(p->range_tr);
834
835 if (p->type_attr_map_array) {
836 for (i = 0; i < p->p_types.nprim; i++)
837 ebitmap_destroy(&p->type_attr_map_array[i]);
838 kvfree(p->type_attr_map_array);
839 }
840
841 ebitmap_destroy(&p->filename_trans_ttypes);
842 ebitmap_destroy(&p->policycaps);
843 ebitmap_destroy(&p->permissive_map);
844}
845
846/*
847 * Load the initial SIDs specified in a policy database
848 * structure into a SID table.
849 */
850int policydb_load_isids(struct policydb *p, struct sidtab *s)
851{
852 struct ocontext *head, *c;
853 int rc;
854
855 rc = sidtab_init(s);
856 if (rc) {
857 pr_err("SELinux: out of memory on SID table init\n");
858 goto out;
859 }
860
861 head = p->ocontexts[OCON_ISID];
862 for (c = head; c; c = c->next) {
863 rc = -EINVAL;
864 if (!c->context[0].user) {
865 pr_err("SELinux: SID %s was never defined.\n",
866 c->u.name);
867 sidtab_destroy(s);
868 goto out;
869 }
870 if (c->sid[0] == SECSID_NULL || c->sid[0] > SECINITSID_NUM) {
871 pr_err("SELinux: Initial SID %s out of range.\n",
872 c->u.name);
873 sidtab_destroy(s);
874 goto out;
875 }
876
877 rc = sidtab_set_initial(s, c->sid[0], &c->context[0]);
878 if (rc) {
879 pr_err("SELinux: unable to load initial SID %s.\n",
880 c->u.name);
881 sidtab_destroy(s);
882 goto out;
883 }
884 }
885 rc = 0;
886out:
887 return rc;
888}
889
890int policydb_class_isvalid(struct policydb *p, unsigned int class)
891{
892 if (!class || class > p->p_classes.nprim)
893 return 0;
894 return 1;
895}
896
897int policydb_role_isvalid(struct policydb *p, unsigned int role)
898{
899 if (!role || role > p->p_roles.nprim)
900 return 0;
901 return 1;
902}
903
904int policydb_type_isvalid(struct policydb *p, unsigned int type)
905{
906 if (!type || type > p->p_types.nprim)
907 return 0;
908 return 1;
909}
910
911/*
912 * Return 1 if the fields in the security context
913 * structure `c' are valid. Return 0 otherwise.
914 */
915int policydb_context_isvalid(struct policydb *p, struct context *c)
916{
917 struct role_datum *role;
918 struct user_datum *usrdatum;
919
920 if (!c->role || c->role > p->p_roles.nprim)
921 return 0;
922
923 if (!c->user || c->user > p->p_users.nprim)
924 return 0;
925
926 if (!c->type || c->type > p->p_types.nprim)
927 return 0;
928
929 if (c->role != OBJECT_R_VAL) {
930 /*
931 * Role must be authorized for the type.
932 */
933 role = p->role_val_to_struct[c->role - 1];
934 if (!role || !ebitmap_get_bit(&role->types, c->type - 1))
935 /* role may not be associated with type */
936 return 0;
937
938 /*
939 * User must be authorized for the role.
940 */
941 usrdatum = p->user_val_to_struct[c->user - 1];
942 if (!usrdatum)
943 return 0;
944
945 if (!ebitmap_get_bit(&usrdatum->roles, c->role - 1))
946 /* user may not be associated with role */
947 return 0;
948 }
949
950 if (!mls_context_isvalid(p, c))
951 return 0;
952
953 return 1;
954}
955
956/*
957 * Read a MLS range structure from a policydb binary
958 * representation file.
959 */
960static int mls_read_range_helper(struct mls_range *r, void *fp)
961{
962 __le32 buf[2];
963 u32 items;
964 int rc;
965
966 rc = next_entry(buf, fp, sizeof(u32));
967 if (rc)
968 goto out;
969
970 rc = -EINVAL;
971 items = le32_to_cpu(buf[0]);
972 if (items > ARRAY_SIZE(buf)) {
973 pr_err("SELinux: mls: range overflow\n");
974 goto out;
975 }
976
977 rc = next_entry(buf, fp, sizeof(u32) * items);
978 if (rc) {
979 pr_err("SELinux: mls: truncated range\n");
980 goto out;
981 }
982
983 r->level[0].sens = le32_to_cpu(buf[0]);
984 if (items > 1)
985 r->level[1].sens = le32_to_cpu(buf[1]);
986 else
987 r->level[1].sens = r->level[0].sens;
988
989 rc = ebitmap_read(&r->level[0].cat, fp);
990 if (rc) {
991 pr_err("SELinux: mls: error reading low categories\n");
992 goto out;
993 }
994 if (items > 1) {
995 rc = ebitmap_read(&r->level[1].cat, fp);
996 if (rc) {
997 pr_err("SELinux: mls: error reading high categories\n");
998 goto bad_high;
999 }
1000 } else {
1001 rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat);
1002 if (rc) {
1003 pr_err("SELinux: mls: out of memory\n");
1004 goto bad_high;
1005 }
1006 }
1007
1008 return 0;
1009bad_high:
1010 ebitmap_destroy(&r->level[0].cat);
1011out:
1012 return rc;
1013}
1014
1015/*
1016 * Read and validate a security context structure
1017 * from a policydb binary representation file.
1018 */
1019static int context_read_and_validate(struct context *c,
1020 struct policydb *p,
1021 void *fp)
1022{
1023 __le32 buf[3];
1024 int rc;
1025
1026 rc = next_entry(buf, fp, sizeof buf);
1027 if (rc) {
1028 pr_err("SELinux: context truncated\n");
1029 goto out;
1030 }
1031 c->user = le32_to_cpu(buf[0]);
1032 c->role = le32_to_cpu(buf[1]);
1033 c->type = le32_to_cpu(buf[2]);
1034 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1035 rc = mls_read_range_helper(&c->range, fp);
1036 if (rc) {
1037 pr_err("SELinux: error reading MLS range of context\n");
1038 goto out;
1039 }
1040 }
1041
1042 rc = -EINVAL;
1043 if (!policydb_context_isvalid(p, c)) {
1044 pr_err("SELinux: invalid security context\n");
1045 context_destroy(c);
1046 goto out;
1047 }
1048 rc = 0;
1049out:
1050 return rc;
1051}
1052
1053/*
1054 * The following *_read functions are used to
1055 * read the symbol data from a policy database
1056 * binary representation file.
1057 */
1058
1059static int str_read(char **strp, gfp_t flags, void *fp, u32 len)
1060{
1061 int rc;
1062 char *str;
1063
1064 if ((len == 0) || (len == (u32)-1))
1065 return -EINVAL;
1066
1067 str = kmalloc(len + 1, flags | __GFP_NOWARN);
1068 if (!str)
1069 return -ENOMEM;
1070
1071 /* it's expected the caller should free the str */
1072 *strp = str;
1073
1074 rc = next_entry(str, fp, len);
1075 if (rc)
1076 return rc;
1077
1078 str[len] = '\0';
1079 return 0;
1080}
1081
1082static int perm_read(struct policydb *p, struct hashtab *h, void *fp)
1083{
1084 char *key = NULL;
1085 struct perm_datum *perdatum;
1086 int rc;
1087 __le32 buf[2];
1088 u32 len;
1089
1090 perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
1091 if (!perdatum)
1092 return -ENOMEM;
1093
1094 rc = next_entry(buf, fp, sizeof buf);
1095 if (rc)
1096 goto bad;
1097
1098 len = le32_to_cpu(buf[0]);
1099 perdatum->value = le32_to_cpu(buf[1]);
1100
1101 rc = str_read(&key, GFP_KERNEL, fp, len);
1102 if (rc)
1103 goto bad;
1104
1105 rc = hashtab_insert(h, key, perdatum);
1106 if (rc)
1107 goto bad;
1108
1109 return 0;
1110bad:
1111 perm_destroy(key, perdatum, NULL);
1112 return rc;
1113}
1114
1115static int common_read(struct policydb *p, struct hashtab *h, void *fp)
1116{
1117 char *key = NULL;
1118 struct common_datum *comdatum;
1119 __le32 buf[4];
1120 u32 len, nel;
1121 int i, rc;
1122
1123 comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
1124 if (!comdatum)
1125 return -ENOMEM;
1126
1127 rc = next_entry(buf, fp, sizeof buf);
1128 if (rc)
1129 goto bad;
1130
1131 len = le32_to_cpu(buf[0]);
1132 comdatum->value = le32_to_cpu(buf[1]);
1133
1134 rc = symtab_init(&comdatum->permissions, PERM_SYMTAB_SIZE);
1135 if (rc)
1136 goto bad;
1137 comdatum->permissions.nprim = le32_to_cpu(buf[2]);
1138 nel = le32_to_cpu(buf[3]);
1139
1140 rc = str_read(&key, GFP_KERNEL, fp, len);
1141 if (rc)
1142 goto bad;
1143
1144 for (i = 0; i < nel; i++) {
1145 rc = perm_read(p, comdatum->permissions.table, fp);
1146 if (rc)
1147 goto bad;
1148 }
1149
1150 rc = hashtab_insert(h, key, comdatum);
1151 if (rc)
1152 goto bad;
1153 return 0;
1154bad:
1155 common_destroy(key, comdatum, NULL);
1156 return rc;
1157}
1158
1159static void type_set_init(struct type_set *t)
1160{
1161 ebitmap_init(&t->types);
1162 ebitmap_init(&t->negset);
1163}
1164
1165static int type_set_read(struct type_set *t, void *fp)
1166{
1167 __le32 buf[1];
1168 int rc;
1169
1170 if (ebitmap_read(&t->types, fp))
1171 return -EINVAL;
1172 if (ebitmap_read(&t->negset, fp))
1173 return -EINVAL;
1174
1175 rc = next_entry(buf, fp, sizeof(u32));
1176 if (rc < 0)
1177 return -EINVAL;
1178 t->flags = le32_to_cpu(buf[0]);
1179
1180 return 0;
1181}
1182
1183
1184static int read_cons_helper(struct policydb *p,
1185 struct constraint_node **nodep,
1186 int ncons, int allowxtarget, void *fp)
1187{
1188 struct constraint_node *c, *lc;
1189 struct constraint_expr *e, *le;
1190 __le32 buf[3];
1191 u32 nexpr;
1192 int rc, i, j, depth;
1193
1194 lc = NULL;
1195 for (i = 0; i < ncons; i++) {
1196 c = kzalloc(sizeof(*c), GFP_KERNEL);
1197 if (!c)
1198 return -ENOMEM;
1199
1200 if (lc)
1201 lc->next = c;
1202 else
1203 *nodep = c;
1204
1205 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1206 if (rc)
1207 return rc;
1208 c->permissions = le32_to_cpu(buf[0]);
1209 nexpr = le32_to_cpu(buf[1]);
1210 le = NULL;
1211 depth = -1;
1212 for (j = 0; j < nexpr; j++) {
1213 e = kzalloc(sizeof(*e), GFP_KERNEL);
1214 if (!e)
1215 return -ENOMEM;
1216
1217 if (le)
1218 le->next = e;
1219 else
1220 c->expr = e;
1221
1222 rc = next_entry(buf, fp, (sizeof(u32) * 3));
1223 if (rc)
1224 return rc;
1225 e->expr_type = le32_to_cpu(buf[0]);
1226 e->attr = le32_to_cpu(buf[1]);
1227 e->op = le32_to_cpu(buf[2]);
1228
1229 switch (e->expr_type) {
1230 case CEXPR_NOT:
1231 if (depth < 0)
1232 return -EINVAL;
1233 break;
1234 case CEXPR_AND:
1235 case CEXPR_OR:
1236 if (depth < 1)
1237 return -EINVAL;
1238 depth--;
1239 break;
1240 case CEXPR_ATTR:
1241 if (depth == (CEXPR_MAXDEPTH - 1))
1242 return -EINVAL;
1243 depth++;
1244 break;
1245 case CEXPR_NAMES:
1246 if (!allowxtarget && (e->attr & CEXPR_XTARGET))
1247 return -EINVAL;
1248 if (depth == (CEXPR_MAXDEPTH - 1))
1249 return -EINVAL;
1250 depth++;
1251 rc = ebitmap_read(&e->names, fp);
1252 if (rc)
1253 return rc;
1254 if (p->policyvers >=
1255 POLICYDB_VERSION_CONSTRAINT_NAMES) {
1256 e->type_names = kzalloc(sizeof
1257 (*e->type_names),
1258 GFP_KERNEL);
1259 if (!e->type_names)
1260 return -ENOMEM;
1261 type_set_init(e->type_names);
1262 rc = type_set_read(e->type_names, fp);
1263 if (rc)
1264 return rc;
1265 }
1266 break;
1267 default:
1268 return -EINVAL;
1269 }
1270 le = e;
1271 }
1272 if (depth != 0)
1273 return -EINVAL;
1274 lc = c;
1275 }
1276
1277 return 0;
1278}
1279
1280static int class_read(struct policydb *p, struct hashtab *h, void *fp)
1281{
1282 char *key = NULL;
1283 struct class_datum *cladatum;
1284 __le32 buf[6];
1285 u32 len, len2, ncons, nel;
1286 int i, rc;
1287
1288 cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
1289 if (!cladatum)
1290 return -ENOMEM;
1291
1292 rc = next_entry(buf, fp, sizeof(u32)*6);
1293 if (rc)
1294 goto bad;
1295
1296 len = le32_to_cpu(buf[0]);
1297 len2 = le32_to_cpu(buf[1]);
1298 cladatum->value = le32_to_cpu(buf[2]);
1299
1300 rc = symtab_init(&cladatum->permissions, PERM_SYMTAB_SIZE);
1301 if (rc)
1302 goto bad;
1303 cladatum->permissions.nprim = le32_to_cpu(buf[3]);
1304 nel = le32_to_cpu(buf[4]);
1305
1306 ncons = le32_to_cpu(buf[5]);
1307
1308 rc = str_read(&key, GFP_KERNEL, fp, len);
1309 if (rc)
1310 goto bad;
1311
1312 if (len2) {
1313 rc = str_read(&cladatum->comkey, GFP_KERNEL, fp, len2);
1314 if (rc)
1315 goto bad;
1316
1317 rc = -EINVAL;
1318 cladatum->comdatum = hashtab_search(p->p_commons.table, cladatum->comkey);
1319 if (!cladatum->comdatum) {
1320 pr_err("SELinux: unknown common %s\n",
1321 cladatum->comkey);
1322 goto bad;
1323 }
1324 }
1325 for (i = 0; i < nel; i++) {
1326 rc = perm_read(p, cladatum->permissions.table, fp);
1327 if (rc)
1328 goto bad;
1329 }
1330
1331 rc = read_cons_helper(p, &cladatum->constraints, ncons, 0, fp);
1332 if (rc)
1333 goto bad;
1334
1335 if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
1336 /* grab the validatetrans rules */
1337 rc = next_entry(buf, fp, sizeof(u32));
1338 if (rc)
1339 goto bad;
1340 ncons = le32_to_cpu(buf[0]);
1341 rc = read_cons_helper(p, &cladatum->validatetrans,
1342 ncons, 1, fp);
1343 if (rc)
1344 goto bad;
1345 }
1346
1347 if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
1348 rc = next_entry(buf, fp, sizeof(u32) * 3);
1349 if (rc)
1350 goto bad;
1351
1352 cladatum->default_user = le32_to_cpu(buf[0]);
1353 cladatum->default_role = le32_to_cpu(buf[1]);
1354 cladatum->default_range = le32_to_cpu(buf[2]);
1355 }
1356
1357 if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
1358 rc = next_entry(buf, fp, sizeof(u32) * 1);
1359 if (rc)
1360 goto bad;
1361 cladatum->default_type = le32_to_cpu(buf[0]);
1362 }
1363
1364 rc = hashtab_insert(h, key, cladatum);
1365 if (rc)
1366 goto bad;
1367
1368 return 0;
1369bad:
1370 cls_destroy(key, cladatum, NULL);
1371 return rc;
1372}
1373
1374static int role_read(struct policydb *p, struct hashtab *h, void *fp)
1375{
1376 char *key = NULL;
1377 struct role_datum *role;
1378 int rc, to_read = 2;
1379 __le32 buf[3];
1380 u32 len;
1381
1382 role = kzalloc(sizeof(*role), GFP_KERNEL);
1383 if (!role)
1384 return -ENOMEM;
1385
1386 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1387 to_read = 3;
1388
1389 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1390 if (rc)
1391 goto bad;
1392
1393 len = le32_to_cpu(buf[0]);
1394 role->value = le32_to_cpu(buf[1]);
1395 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1396 role->bounds = le32_to_cpu(buf[2]);
1397
1398 rc = str_read(&key, GFP_KERNEL, fp, len);
1399 if (rc)
1400 goto bad;
1401
1402 rc = ebitmap_read(&role->dominates, fp);
1403 if (rc)
1404 goto bad;
1405
1406 rc = ebitmap_read(&role->types, fp);
1407 if (rc)
1408 goto bad;
1409
1410 if (strcmp(key, OBJECT_R) == 0) {
1411 rc = -EINVAL;
1412 if (role->value != OBJECT_R_VAL) {
1413 pr_err("SELinux: Role %s has wrong value %d\n",
1414 OBJECT_R, role->value);
1415 goto bad;
1416 }
1417 rc = 0;
1418 goto bad;
1419 }
1420
1421 rc = hashtab_insert(h, key, role);
1422 if (rc)
1423 goto bad;
1424 return 0;
1425bad:
1426 role_destroy(key, role, NULL);
1427 return rc;
1428}
1429
1430static int type_read(struct policydb *p, struct hashtab *h, void *fp)
1431{
1432 char *key = NULL;
1433 struct type_datum *typdatum;
1434 int rc, to_read = 3;
1435 __le32 buf[4];
1436 u32 len;
1437
1438 typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL);
1439 if (!typdatum)
1440 return -ENOMEM;
1441
1442 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1443 to_read = 4;
1444
1445 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1446 if (rc)
1447 goto bad;
1448
1449 len = le32_to_cpu(buf[0]);
1450 typdatum->value = le32_to_cpu(buf[1]);
1451 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
1452 u32 prop = le32_to_cpu(buf[2]);
1453
1454 if (prop & TYPEDATUM_PROPERTY_PRIMARY)
1455 typdatum->primary = 1;
1456 if (prop & TYPEDATUM_PROPERTY_ATTRIBUTE)
1457 typdatum->attribute = 1;
1458
1459 typdatum->bounds = le32_to_cpu(buf[3]);
1460 } else {
1461 typdatum->primary = le32_to_cpu(buf[2]);
1462 }
1463
1464 rc = str_read(&key, GFP_KERNEL, fp, len);
1465 if (rc)
1466 goto bad;
1467
1468 rc = hashtab_insert(h, key, typdatum);
1469 if (rc)
1470 goto bad;
1471 return 0;
1472bad:
1473 type_destroy(key, typdatum, NULL);
1474 return rc;
1475}
1476
1477
1478/*
1479 * Read a MLS level structure from a policydb binary
1480 * representation file.
1481 */
1482static int mls_read_level(struct mls_level *lp, void *fp)
1483{
1484 __le32 buf[1];
1485 int rc;
1486
1487 memset(lp, 0, sizeof(*lp));
1488
1489 rc = next_entry(buf, fp, sizeof buf);
1490 if (rc) {
1491 pr_err("SELinux: mls: truncated level\n");
1492 return rc;
1493 }
1494 lp->sens = le32_to_cpu(buf[0]);
1495
1496 rc = ebitmap_read(&lp->cat, fp);
1497 if (rc) {
1498 pr_err("SELinux: mls: error reading level categories\n");
1499 return rc;
1500 }
1501 return 0;
1502}
1503
1504static int user_read(struct policydb *p, struct hashtab *h, void *fp)
1505{
1506 char *key = NULL;
1507 struct user_datum *usrdatum;
1508 int rc, to_read = 2;
1509 __le32 buf[3];
1510 u32 len;
1511
1512 usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
1513 if (!usrdatum)
1514 return -ENOMEM;
1515
1516 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1517 to_read = 3;
1518
1519 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1520 if (rc)
1521 goto bad;
1522
1523 len = le32_to_cpu(buf[0]);
1524 usrdatum->value = le32_to_cpu(buf[1]);
1525 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1526 usrdatum->bounds = le32_to_cpu(buf[2]);
1527
1528 rc = str_read(&key, GFP_KERNEL, fp, len);
1529 if (rc)
1530 goto bad;
1531
1532 rc = ebitmap_read(&usrdatum->roles, fp);
1533 if (rc)
1534 goto bad;
1535
1536 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1537 rc = mls_read_range_helper(&usrdatum->range, fp);
1538 if (rc)
1539 goto bad;
1540 rc = mls_read_level(&usrdatum->dfltlevel, fp);
1541 if (rc)
1542 goto bad;
1543 }
1544
1545 rc = hashtab_insert(h, key, usrdatum);
1546 if (rc)
1547 goto bad;
1548 return 0;
1549bad:
1550 user_destroy(key, usrdatum, NULL);
1551 return rc;
1552}
1553
1554static int sens_read(struct policydb *p, struct hashtab *h, void *fp)
1555{
1556 char *key = NULL;
1557 struct level_datum *levdatum;
1558 int rc;
1559 __le32 buf[2];
1560 u32 len;
1561
1562 levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC);
1563 if (!levdatum)
1564 return -ENOMEM;
1565
1566 rc = next_entry(buf, fp, sizeof buf);
1567 if (rc)
1568 goto bad;
1569
1570 len = le32_to_cpu(buf[0]);
1571 levdatum->isalias = le32_to_cpu(buf[1]);
1572
1573 rc = str_read(&key, GFP_ATOMIC, fp, len);
1574 if (rc)
1575 goto bad;
1576
1577 rc = -ENOMEM;
1578 levdatum->level = kmalloc(sizeof(*levdatum->level), GFP_ATOMIC);
1579 if (!levdatum->level)
1580 goto bad;
1581
1582 rc = mls_read_level(levdatum->level, fp);
1583 if (rc)
1584 goto bad;
1585
1586 rc = hashtab_insert(h, key, levdatum);
1587 if (rc)
1588 goto bad;
1589 return 0;
1590bad:
1591 sens_destroy(key, levdatum, NULL);
1592 return rc;
1593}
1594
1595static int cat_read(struct policydb *p, struct hashtab *h, void *fp)
1596{
1597 char *key = NULL;
1598 struct cat_datum *catdatum;
1599 int rc;
1600 __le32 buf[3];
1601 u32 len;
1602
1603 catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC);
1604 if (!catdatum)
1605 return -ENOMEM;
1606
1607 rc = next_entry(buf, fp, sizeof buf);
1608 if (rc)
1609 goto bad;
1610
1611 len = le32_to_cpu(buf[0]);
1612 catdatum->value = le32_to_cpu(buf[1]);
1613 catdatum->isalias = le32_to_cpu(buf[2]);
1614
1615 rc = str_read(&key, GFP_ATOMIC, fp, len);
1616 if (rc)
1617 goto bad;
1618
1619 rc = hashtab_insert(h, key, catdatum);
1620 if (rc)
1621 goto bad;
1622 return 0;
1623bad:
1624 cat_destroy(key, catdatum, NULL);
1625 return rc;
1626}
1627
1628static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, void *fp) =
1629{
1630 common_read,
1631 class_read,
1632 role_read,
1633 type_read,
1634 user_read,
1635 cond_read_bool,
1636 sens_read,
1637 cat_read,
1638};
1639
1640static int user_bounds_sanity_check(void *key, void *datum, void *datap)
1641{
1642 struct user_datum *upper, *user;
1643 struct policydb *p = datap;
1644 int depth = 0;
1645
1646 upper = user = datum;
1647 while (upper->bounds) {
1648 struct ebitmap_node *node;
1649 unsigned long bit;
1650
1651 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1652 pr_err("SELinux: user %s: "
1653 "too deep or looped boundary",
1654 (char *) key);
1655 return -EINVAL;
1656 }
1657
1658 upper = p->user_val_to_struct[upper->bounds - 1];
1659 ebitmap_for_each_positive_bit(&user->roles, node, bit) {
1660 if (ebitmap_get_bit(&upper->roles, bit))
1661 continue;
1662
1663 pr_err("SELinux: boundary violated policy: "
1664 "user=%s role=%s bounds=%s\n",
1665 sym_name(p, SYM_USERS, user->value - 1),
1666 sym_name(p, SYM_ROLES, bit),
1667 sym_name(p, SYM_USERS, upper->value - 1));
1668
1669 return -EINVAL;
1670 }
1671 }
1672
1673 return 0;
1674}
1675
1676static int role_bounds_sanity_check(void *key, void *datum, void *datap)
1677{
1678 struct role_datum *upper, *role;
1679 struct policydb *p = datap;
1680 int depth = 0;
1681
1682 upper = role = datum;
1683 while (upper->bounds) {
1684 struct ebitmap_node *node;
1685 unsigned long bit;
1686
1687 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1688 pr_err("SELinux: role %s: "
1689 "too deep or looped bounds\n",
1690 (char *) key);
1691 return -EINVAL;
1692 }
1693
1694 upper = p->role_val_to_struct[upper->bounds - 1];
1695 ebitmap_for_each_positive_bit(&role->types, node, bit) {
1696 if (ebitmap_get_bit(&upper->types, bit))
1697 continue;
1698
1699 pr_err("SELinux: boundary violated policy: "
1700 "role=%s type=%s bounds=%s\n",
1701 sym_name(p, SYM_ROLES, role->value - 1),
1702 sym_name(p, SYM_TYPES, bit),
1703 sym_name(p, SYM_ROLES, upper->value - 1));
1704
1705 return -EINVAL;
1706 }
1707 }
1708
1709 return 0;
1710}
1711
1712static int type_bounds_sanity_check(void *key, void *datum, void *datap)
1713{
1714 struct type_datum *upper;
1715 struct policydb *p = datap;
1716 int depth = 0;
1717
1718 upper = datum;
1719 while (upper->bounds) {
1720 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1721 pr_err("SELinux: type %s: "
1722 "too deep or looped boundary\n",
1723 (char *) key);
1724 return -EINVAL;
1725 }
1726
1727 upper = p->type_val_to_struct[upper->bounds - 1];
1728 BUG_ON(!upper);
1729
1730 if (upper->attribute) {
1731 pr_err("SELinux: type %s: "
1732 "bounded by attribute %s",
1733 (char *) key,
1734 sym_name(p, SYM_TYPES, upper->value - 1));
1735 return -EINVAL;
1736 }
1737 }
1738
1739 return 0;
1740}
1741
1742static int policydb_bounds_sanity_check(struct policydb *p)
1743{
1744 int rc;
1745
1746 if (p->policyvers < POLICYDB_VERSION_BOUNDARY)
1747 return 0;
1748
1749 rc = hashtab_map(p->p_users.table,
1750 user_bounds_sanity_check, p);
1751 if (rc)
1752 return rc;
1753
1754 rc = hashtab_map(p->p_roles.table,
1755 role_bounds_sanity_check, p);
1756 if (rc)
1757 return rc;
1758
1759 rc = hashtab_map(p->p_types.table,
1760 type_bounds_sanity_check, p);
1761 if (rc)
1762 return rc;
1763
1764 return 0;
1765}
1766
1767u16 string_to_security_class(struct policydb *p, const char *name)
1768{
1769 struct class_datum *cladatum;
1770
1771 cladatum = hashtab_search(p->p_classes.table, name);
1772 if (!cladatum)
1773 return 0;
1774
1775 return cladatum->value;
1776}
1777
1778u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name)
1779{
1780 struct class_datum *cladatum;
1781 struct perm_datum *perdatum = NULL;
1782 struct common_datum *comdatum;
1783
1784 if (!tclass || tclass > p->p_classes.nprim)
1785 return 0;
1786
1787 cladatum = p->class_val_to_struct[tclass-1];
1788 comdatum = cladatum->comdatum;
1789 if (comdatum)
1790 perdatum = hashtab_search(comdatum->permissions.table,
1791 name);
1792 if (!perdatum)
1793 perdatum = hashtab_search(cladatum->permissions.table,
1794 name);
1795 if (!perdatum)
1796 return 0;
1797
1798 return 1U << (perdatum->value-1);
1799}
1800
1801static int range_read(struct policydb *p, void *fp)
1802{
1803 struct range_trans *rt = NULL;
1804 struct mls_range *r = NULL;
1805 int i, rc;
1806 __le32 buf[2];
1807 u32 nel;
1808
1809 if (p->policyvers < POLICYDB_VERSION_MLS)
1810 return 0;
1811
1812 rc = next_entry(buf, fp, sizeof(u32));
1813 if (rc)
1814 return rc;
1815
1816 nel = le32_to_cpu(buf[0]);
1817 for (i = 0; i < nel; i++) {
1818 rc = -ENOMEM;
1819 rt = kzalloc(sizeof(*rt), GFP_KERNEL);
1820 if (!rt)
1821 goto out;
1822
1823 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1824 if (rc)
1825 goto out;
1826
1827 rt->source_type = le32_to_cpu(buf[0]);
1828 rt->target_type = le32_to_cpu(buf[1]);
1829 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
1830 rc = next_entry(buf, fp, sizeof(u32));
1831 if (rc)
1832 goto out;
1833 rt->target_class = le32_to_cpu(buf[0]);
1834 } else
1835 rt->target_class = p->process_class;
1836
1837 rc = -EINVAL;
1838 if (!policydb_type_isvalid(p, rt->source_type) ||
1839 !policydb_type_isvalid(p, rt->target_type) ||
1840 !policydb_class_isvalid(p, rt->target_class))
1841 goto out;
1842
1843 rc = -ENOMEM;
1844 r = kzalloc(sizeof(*r), GFP_KERNEL);
1845 if (!r)
1846 goto out;
1847
1848 rc = mls_read_range_helper(r, fp);
1849 if (rc)
1850 goto out;
1851
1852 rc = -EINVAL;
1853 if (!mls_range_isvalid(p, r)) {
1854 pr_warn("SELinux: rangetrans: invalid range\n");
1855 goto out;
1856 }
1857
1858 rc = hashtab_insert(p->range_tr, rt, r);
1859 if (rc)
1860 goto out;
1861
1862 rt = NULL;
1863 r = NULL;
1864 }
1865 hash_eval(p->range_tr, "rangetr");
1866 rc = 0;
1867out:
1868 kfree(rt);
1869 kfree(r);
1870 return rc;
1871}
1872
1873static int filename_trans_read(struct policydb *p, void *fp)
1874{
1875 struct filename_trans *ft;
1876 struct filename_trans_datum *otype;
1877 char *name;
1878 u32 nel, len;
1879 __le32 buf[4];
1880 int rc, i;
1881
1882 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
1883 return 0;
1884
1885 rc = next_entry(buf, fp, sizeof(u32));
1886 if (rc)
1887 return rc;
1888 nel = le32_to_cpu(buf[0]);
1889
1890 for (i = 0; i < nel; i++) {
1891 otype = NULL;
1892 name = NULL;
1893
1894 rc = -ENOMEM;
1895 ft = kzalloc(sizeof(*ft), GFP_KERNEL);
1896 if (!ft)
1897 goto out;
1898
1899 rc = -ENOMEM;
1900 otype = kmalloc(sizeof(*otype), GFP_KERNEL);
1901 if (!otype)
1902 goto out;
1903
1904 /* length of the path component string */
1905 rc = next_entry(buf, fp, sizeof(u32));
1906 if (rc)
1907 goto out;
1908 len = le32_to_cpu(buf[0]);
1909
1910 /* path component string */
1911 rc = str_read(&name, GFP_KERNEL, fp, len);
1912 if (rc)
1913 goto out;
1914
1915 ft->name = name;
1916
1917 rc = next_entry(buf, fp, sizeof(u32) * 4);
1918 if (rc)
1919 goto out;
1920
1921 ft->stype = le32_to_cpu(buf[0]);
1922 ft->ttype = le32_to_cpu(buf[1]);
1923 ft->tclass = le32_to_cpu(buf[2]);
1924
1925 otype->otype = le32_to_cpu(buf[3]);
1926
1927 rc = ebitmap_set_bit(&p->filename_trans_ttypes, ft->ttype, 1);
1928 if (rc)
1929 goto out;
1930
1931 rc = hashtab_insert(p->filename_trans, ft, otype);
1932 if (rc) {
1933 /*
1934 * Do not return -EEXIST to the caller, or the system
1935 * will not boot.
1936 */
1937 if (rc != -EEXIST)
1938 goto out;
1939 /* But free memory to avoid memory leak. */
1940 kfree(ft);
1941 kfree(name);
1942 kfree(otype);
1943 }
1944 }
1945 hash_eval(p->filename_trans, "filenametr");
1946 return 0;
1947out:
1948 kfree(ft);
1949 kfree(name);
1950 kfree(otype);
1951
1952 return rc;
1953}
1954
1955static int genfs_read(struct policydb *p, void *fp)
1956{
1957 int i, j, rc;
1958 u32 nel, nel2, len, len2;
1959 __le32 buf[1];
1960 struct ocontext *l, *c;
1961 struct ocontext *newc = NULL;
1962 struct genfs *genfs_p, *genfs;
1963 struct genfs *newgenfs = NULL;
1964
1965 rc = next_entry(buf, fp, sizeof(u32));
1966 if (rc)
1967 return rc;
1968 nel = le32_to_cpu(buf[0]);
1969
1970 for (i = 0; i < nel; i++) {
1971 rc = next_entry(buf, fp, sizeof(u32));
1972 if (rc)
1973 goto out;
1974 len = le32_to_cpu(buf[0]);
1975
1976 rc = -ENOMEM;
1977 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
1978 if (!newgenfs)
1979 goto out;
1980
1981 rc = str_read(&newgenfs->fstype, GFP_KERNEL, fp, len);
1982 if (rc)
1983 goto out;
1984
1985 for (genfs_p = NULL, genfs = p->genfs; genfs;
1986 genfs_p = genfs, genfs = genfs->next) {
1987 rc = -EINVAL;
1988 if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
1989 pr_err("SELinux: dup genfs fstype %s\n",
1990 newgenfs->fstype);
1991 goto out;
1992 }
1993 if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
1994 break;
1995 }
1996 newgenfs->next = genfs;
1997 if (genfs_p)
1998 genfs_p->next = newgenfs;
1999 else
2000 p->genfs = newgenfs;
2001 genfs = newgenfs;
2002 newgenfs = NULL;
2003
2004 rc = next_entry(buf, fp, sizeof(u32));
2005 if (rc)
2006 goto out;
2007
2008 nel2 = le32_to_cpu(buf[0]);
2009 for (j = 0; j < nel2; j++) {
2010 rc = next_entry(buf, fp, sizeof(u32));
2011 if (rc)
2012 goto out;
2013 len = le32_to_cpu(buf[0]);
2014
2015 rc = -ENOMEM;
2016 newc = kzalloc(sizeof(*newc), GFP_KERNEL);
2017 if (!newc)
2018 goto out;
2019
2020 rc = str_read(&newc->u.name, GFP_KERNEL, fp, len);
2021 if (rc)
2022 goto out;
2023
2024 rc = next_entry(buf, fp, sizeof(u32));
2025 if (rc)
2026 goto out;
2027
2028 newc->v.sclass = le32_to_cpu(buf[0]);
2029 rc = context_read_and_validate(&newc->context[0], p, fp);
2030 if (rc)
2031 goto out;
2032
2033 for (l = NULL, c = genfs->head; c;
2034 l = c, c = c->next) {
2035 rc = -EINVAL;
2036 if (!strcmp(newc->u.name, c->u.name) &&
2037 (!c->v.sclass || !newc->v.sclass ||
2038 newc->v.sclass == c->v.sclass)) {
2039 pr_err("SELinux: dup genfs entry (%s,%s)\n",
2040 genfs->fstype, c->u.name);
2041 goto out;
2042 }
2043 len = strlen(newc->u.name);
2044 len2 = strlen(c->u.name);
2045 if (len > len2)
2046 break;
2047 }
2048
2049 newc->next = c;
2050 if (l)
2051 l->next = newc;
2052 else
2053 genfs->head = newc;
2054 newc = NULL;
2055 }
2056 }
2057 rc = 0;
2058out:
2059 if (newgenfs) {
2060 kfree(newgenfs->fstype);
2061 kfree(newgenfs);
2062 }
2063 ocontext_destroy(newc, OCON_FSUSE);
2064
2065 return rc;
2066}
2067
2068static int ocontext_read(struct policydb *p, struct policydb_compat_info *info,
2069 void *fp)
2070{
2071 int i, j, rc;
2072 u32 nel, len;
2073 __be64 prefixbuf[1];
2074 __le32 buf[3];
2075 struct ocontext *l, *c;
2076 u32 nodebuf[8];
2077
2078 for (i = 0; i < info->ocon_num; i++) {
2079 rc = next_entry(buf, fp, sizeof(u32));
2080 if (rc)
2081 goto out;
2082 nel = le32_to_cpu(buf[0]);
2083
2084 l = NULL;
2085 for (j = 0; j < nel; j++) {
2086 rc = -ENOMEM;
2087 c = kzalloc(sizeof(*c), GFP_KERNEL);
2088 if (!c)
2089 goto out;
2090 if (l)
2091 l->next = c;
2092 else
2093 p->ocontexts[i] = c;
2094 l = c;
2095
2096 switch (i) {
2097 case OCON_ISID:
2098 rc = next_entry(buf, fp, sizeof(u32));
2099 if (rc)
2100 goto out;
2101
2102 c->sid[0] = le32_to_cpu(buf[0]);
2103 rc = context_read_and_validate(&c->context[0], p, fp);
2104 if (rc)
2105 goto out;
2106 break;
2107 case OCON_FS:
2108 case OCON_NETIF:
2109 rc = next_entry(buf, fp, sizeof(u32));
2110 if (rc)
2111 goto out;
2112 len = le32_to_cpu(buf[0]);
2113
2114 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2115 if (rc)
2116 goto out;
2117
2118 rc = context_read_and_validate(&c->context[0], p, fp);
2119 if (rc)
2120 goto out;
2121 rc = context_read_and_validate(&c->context[1], p, fp);
2122 if (rc)
2123 goto out;
2124 break;
2125 case OCON_PORT:
2126 rc = next_entry(buf, fp, sizeof(u32)*3);
2127 if (rc)
2128 goto out;
2129 c->u.port.protocol = le32_to_cpu(buf[0]);
2130 c->u.port.low_port = le32_to_cpu(buf[1]);
2131 c->u.port.high_port = le32_to_cpu(buf[2]);
2132 rc = context_read_and_validate(&c->context[0], p, fp);
2133 if (rc)
2134 goto out;
2135 break;
2136 case OCON_NODE:
2137 rc = next_entry(nodebuf, fp, sizeof(u32) * 2);
2138 if (rc)
2139 goto out;
2140 c->u.node.addr = nodebuf[0]; /* network order */
2141 c->u.node.mask = nodebuf[1]; /* network order */
2142 rc = context_read_and_validate(&c->context[0], p, fp);
2143 if (rc)
2144 goto out;
2145 break;
2146 case OCON_FSUSE:
2147 rc = next_entry(buf, fp, sizeof(u32)*2);
2148 if (rc)
2149 goto out;
2150
2151 rc = -EINVAL;
2152 c->v.behavior = le32_to_cpu(buf[0]);
2153 /* Determined at runtime, not in policy DB. */
2154 if (c->v.behavior == SECURITY_FS_USE_MNTPOINT)
2155 goto out;
2156 if (c->v.behavior > SECURITY_FS_USE_MAX)
2157 goto out;
2158
2159 len = le32_to_cpu(buf[1]);
2160 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2161 if (rc)
2162 goto out;
2163
2164 rc = context_read_and_validate(&c->context[0], p, fp);
2165 if (rc)
2166 goto out;
2167 break;
2168 case OCON_NODE6: {
2169 int k;
2170
2171 rc = next_entry(nodebuf, fp, sizeof(u32) * 8);
2172 if (rc)
2173 goto out;
2174 for (k = 0; k < 4; k++)
2175 c->u.node6.addr[k] = nodebuf[k];
2176 for (k = 0; k < 4; k++)
2177 c->u.node6.mask[k] = nodebuf[k+4];
2178 rc = context_read_and_validate(&c->context[0], p, fp);
2179 if (rc)
2180 goto out;
2181 break;
2182 }
2183 case OCON_IBPKEY: {
2184 u32 pkey_lo, pkey_hi;
2185
2186 rc = next_entry(prefixbuf, fp, sizeof(u64));
2187 if (rc)
2188 goto out;
2189
2190 /* we need to have subnet_prefix in CPU order */
2191 c->u.ibpkey.subnet_prefix = be64_to_cpu(prefixbuf[0]);
2192
2193 rc = next_entry(buf, fp, sizeof(u32) * 2);
2194 if (rc)
2195 goto out;
2196
2197 pkey_lo = le32_to_cpu(buf[0]);
2198 pkey_hi = le32_to_cpu(buf[1]);
2199
2200 if (pkey_lo > U16_MAX || pkey_hi > U16_MAX) {
2201 rc = -EINVAL;
2202 goto out;
2203 }
2204
2205 c->u.ibpkey.low_pkey = pkey_lo;
2206 c->u.ibpkey.high_pkey = pkey_hi;
2207
2208 rc = context_read_and_validate(&c->context[0],
2209 p,
2210 fp);
2211 if (rc)
2212 goto out;
2213 break;
2214 }
2215 case OCON_IBENDPORT: {
2216 u32 port;
2217
2218 rc = next_entry(buf, fp, sizeof(u32) * 2);
2219 if (rc)
2220 goto out;
2221 len = le32_to_cpu(buf[0]);
2222
2223 rc = str_read(&c->u.ibendport.dev_name, GFP_KERNEL, fp, len);
2224 if (rc)
2225 goto out;
2226
2227 port = le32_to_cpu(buf[1]);
2228 if (port > U8_MAX || port == 0) {
2229 rc = -EINVAL;
2230 goto out;
2231 }
2232
2233 c->u.ibendport.port = port;
2234
2235 rc = context_read_and_validate(&c->context[0],
2236 p,
2237 fp);
2238 if (rc)
2239 goto out;
2240 break;
2241 } /* end case */
2242 } /* end switch */
2243 }
2244 }
2245 rc = 0;
2246out:
2247 return rc;
2248}
2249
2250/*
2251 * Read the configuration data from a policy database binary
2252 * representation file into a policy database structure.
2253 */
2254int policydb_read(struct policydb *p, void *fp)
2255{
2256 struct role_allow *ra, *lra;
2257 struct role_trans *tr, *ltr;
2258 int i, j, rc;
2259 __le32 buf[4];
2260 u32 len, nprim, nel;
2261
2262 char *policydb_str;
2263 struct policydb_compat_info *info;
2264
2265 rc = policydb_init(p);
2266 if (rc)
2267 return rc;
2268
2269 /* Read the magic number and string length. */
2270 rc = next_entry(buf, fp, sizeof(u32) * 2);
2271 if (rc)
2272 goto bad;
2273
2274 rc = -EINVAL;
2275 if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
2276 pr_err("SELinux: policydb magic number 0x%x does "
2277 "not match expected magic number 0x%x\n",
2278 le32_to_cpu(buf[0]), POLICYDB_MAGIC);
2279 goto bad;
2280 }
2281
2282 rc = -EINVAL;
2283 len = le32_to_cpu(buf[1]);
2284 if (len != strlen(POLICYDB_STRING)) {
2285 pr_err("SELinux: policydb string length %d does not "
2286 "match expected length %zu\n",
2287 len, strlen(POLICYDB_STRING));
2288 goto bad;
2289 }
2290
2291 rc = -ENOMEM;
2292 policydb_str = kmalloc(len + 1, GFP_KERNEL);
2293 if (!policydb_str) {
2294 pr_err("SELinux: unable to allocate memory for policydb "
2295 "string of length %d\n", len);
2296 goto bad;
2297 }
2298
2299 rc = next_entry(policydb_str, fp, len);
2300 if (rc) {
2301 pr_err("SELinux: truncated policydb string identifier\n");
2302 kfree(policydb_str);
2303 goto bad;
2304 }
2305
2306 rc = -EINVAL;
2307 policydb_str[len] = '\0';
2308 if (strcmp(policydb_str, POLICYDB_STRING)) {
2309 pr_err("SELinux: policydb string %s does not match "
2310 "my string %s\n", policydb_str, POLICYDB_STRING);
2311 kfree(policydb_str);
2312 goto bad;
2313 }
2314 /* Done with policydb_str. */
2315 kfree(policydb_str);
2316 policydb_str = NULL;
2317
2318 /* Read the version and table sizes. */
2319 rc = next_entry(buf, fp, sizeof(u32)*4);
2320 if (rc)
2321 goto bad;
2322
2323 rc = -EINVAL;
2324 p->policyvers = le32_to_cpu(buf[0]);
2325 if (p->policyvers < POLICYDB_VERSION_MIN ||
2326 p->policyvers > POLICYDB_VERSION_MAX) {
2327 pr_err("SELinux: policydb version %d does not match "
2328 "my version range %d-%d\n",
2329 le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
2330 goto bad;
2331 }
2332
2333 if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
2334 p->mls_enabled = 1;
2335
2336 rc = -EINVAL;
2337 if (p->policyvers < POLICYDB_VERSION_MLS) {
2338 pr_err("SELinux: security policydb version %d "
2339 "(MLS) not backwards compatible\n",
2340 p->policyvers);
2341 goto bad;
2342 }
2343 }
2344 p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
2345 p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
2346
2347 if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
2348 rc = ebitmap_read(&p->policycaps, fp);
2349 if (rc)
2350 goto bad;
2351 }
2352
2353 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
2354 rc = ebitmap_read(&p->permissive_map, fp);
2355 if (rc)
2356 goto bad;
2357 }
2358
2359 rc = -EINVAL;
2360 info = policydb_lookup_compat(p->policyvers);
2361 if (!info) {
2362 pr_err("SELinux: unable to find policy compat info "
2363 "for version %d\n", p->policyvers);
2364 goto bad;
2365 }
2366
2367 rc = -EINVAL;
2368 if (le32_to_cpu(buf[2]) != info->sym_num ||
2369 le32_to_cpu(buf[3]) != info->ocon_num) {
2370 pr_err("SELinux: policydb table sizes (%d,%d) do "
2371 "not match mine (%d,%d)\n", le32_to_cpu(buf[2]),
2372 le32_to_cpu(buf[3]),
2373 info->sym_num, info->ocon_num);
2374 goto bad;
2375 }
2376
2377 for (i = 0; i < info->sym_num; i++) {
2378 rc = next_entry(buf, fp, sizeof(u32)*2);
2379 if (rc)
2380 goto bad;
2381 nprim = le32_to_cpu(buf[0]);
2382 nel = le32_to_cpu(buf[1]);
2383 for (j = 0; j < nel; j++) {
2384 rc = read_f[i](p, p->symtab[i].table, fp);
2385 if (rc)
2386 goto bad;
2387 }
2388
2389 p->symtab[i].nprim = nprim;
2390 }
2391
2392 rc = -EINVAL;
2393 p->process_class = string_to_security_class(p, "process");
2394 if (!p->process_class)
2395 goto bad;
2396
2397 rc = avtab_read(&p->te_avtab, fp, p);
2398 if (rc)
2399 goto bad;
2400
2401 if (p->policyvers >= POLICYDB_VERSION_BOOL) {
2402 rc = cond_read_list(p, fp);
2403 if (rc)
2404 goto bad;
2405 }
2406
2407 rc = next_entry(buf, fp, sizeof(u32));
2408 if (rc)
2409 goto bad;
2410 nel = le32_to_cpu(buf[0]);
2411 ltr = NULL;
2412 for (i = 0; i < nel; i++) {
2413 rc = -ENOMEM;
2414 tr = kzalloc(sizeof(*tr), GFP_KERNEL);
2415 if (!tr)
2416 goto bad;
2417 if (ltr)
2418 ltr->next = tr;
2419 else
2420 p->role_tr = tr;
2421 rc = next_entry(buf, fp, sizeof(u32)*3);
2422 if (rc)
2423 goto bad;
2424
2425 rc = -EINVAL;
2426 tr->role = le32_to_cpu(buf[0]);
2427 tr->type = le32_to_cpu(buf[1]);
2428 tr->new_role = le32_to_cpu(buf[2]);
2429 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2430 rc = next_entry(buf, fp, sizeof(u32));
2431 if (rc)
2432 goto bad;
2433 tr->tclass = le32_to_cpu(buf[0]);
2434 } else
2435 tr->tclass = p->process_class;
2436
2437 rc = -EINVAL;
2438 if (!policydb_role_isvalid(p, tr->role) ||
2439 !policydb_type_isvalid(p, tr->type) ||
2440 !policydb_class_isvalid(p, tr->tclass) ||
2441 !policydb_role_isvalid(p, tr->new_role))
2442 goto bad;
2443 ltr = tr;
2444 }
2445
2446 rc = next_entry(buf, fp, sizeof(u32));
2447 if (rc)
2448 goto bad;
2449 nel = le32_to_cpu(buf[0]);
2450 lra = NULL;
2451 for (i = 0; i < nel; i++) {
2452 rc = -ENOMEM;
2453 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
2454 if (!ra)
2455 goto bad;
2456 if (lra)
2457 lra->next = ra;
2458 else
2459 p->role_allow = ra;
2460 rc = next_entry(buf, fp, sizeof(u32)*2);
2461 if (rc)
2462 goto bad;
2463
2464 rc = -EINVAL;
2465 ra->role = le32_to_cpu(buf[0]);
2466 ra->new_role = le32_to_cpu(buf[1]);
2467 if (!policydb_role_isvalid(p, ra->role) ||
2468 !policydb_role_isvalid(p, ra->new_role))
2469 goto bad;
2470 lra = ra;
2471 }
2472
2473 rc = filename_trans_read(p, fp);
2474 if (rc)
2475 goto bad;
2476
2477 rc = policydb_index(p);
2478 if (rc)
2479 goto bad;
2480
2481 rc = -EINVAL;
2482 p->process_trans_perms = string_to_av_perm(p, p->process_class, "transition");
2483 p->process_trans_perms |= string_to_av_perm(p, p->process_class, "dyntransition");
2484 if (!p->process_trans_perms)
2485 goto bad;
2486
2487 rc = ocontext_read(p, info, fp);
2488 if (rc)
2489 goto bad;
2490
2491 rc = genfs_read(p, fp);
2492 if (rc)
2493 goto bad;
2494
2495 rc = range_read(p, fp);
2496 if (rc)
2497 goto bad;
2498
2499 p->type_attr_map_array = kvcalloc(p->p_types.nprim,
2500 sizeof(*p->type_attr_map_array),
2501 GFP_KERNEL);
2502 if (!p->type_attr_map_array)
2503 goto bad;
2504
2505 /* just in case ebitmap_init() becomes more than just a memset(0): */
2506 for (i = 0; i < p->p_types.nprim; i++)
2507 ebitmap_init(&p->type_attr_map_array[i]);
2508
2509 for (i = 0; i < p->p_types.nprim; i++) {
2510 struct ebitmap *e = &p->type_attr_map_array[i];
2511
2512 if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
2513 rc = ebitmap_read(e, fp);
2514 if (rc)
2515 goto bad;
2516 }
2517 /* add the type itself as the degenerate case */
2518 rc = ebitmap_set_bit(e, i, 1);
2519 if (rc)
2520 goto bad;
2521 }
2522
2523 rc = policydb_bounds_sanity_check(p);
2524 if (rc)
2525 goto bad;
2526
2527 rc = 0;
2528out:
2529 return rc;
2530bad:
2531 policydb_destroy(p);
2532 goto out;
2533}
2534
2535/*
2536 * Write a MLS level structure to a policydb binary
2537 * representation file.
2538 */
2539static int mls_write_level(struct mls_level *l, void *fp)
2540{
2541 __le32 buf[1];
2542 int rc;
2543
2544 buf[0] = cpu_to_le32(l->sens);
2545 rc = put_entry(buf, sizeof(u32), 1, fp);
2546 if (rc)
2547 return rc;
2548
2549 rc = ebitmap_write(&l->cat, fp);
2550 if (rc)
2551 return rc;
2552
2553 return 0;
2554}
2555
2556/*
2557 * Write a MLS range structure to a policydb binary
2558 * representation file.
2559 */
2560static int mls_write_range_helper(struct mls_range *r, void *fp)
2561{
2562 __le32 buf[3];
2563 size_t items;
2564 int rc, eq;
2565
2566 eq = mls_level_eq(&r->level[1], &r->level[0]);
2567
2568 if (eq)
2569 items = 2;
2570 else
2571 items = 3;
2572 buf[0] = cpu_to_le32(items-1);
2573 buf[1] = cpu_to_le32(r->level[0].sens);
2574 if (!eq)
2575 buf[2] = cpu_to_le32(r->level[1].sens);
2576
2577 BUG_ON(items > ARRAY_SIZE(buf));
2578
2579 rc = put_entry(buf, sizeof(u32), items, fp);
2580 if (rc)
2581 return rc;
2582
2583 rc = ebitmap_write(&r->level[0].cat, fp);
2584 if (rc)
2585 return rc;
2586 if (!eq) {
2587 rc = ebitmap_write(&r->level[1].cat, fp);
2588 if (rc)
2589 return rc;
2590 }
2591
2592 return 0;
2593}
2594
2595static int sens_write(void *vkey, void *datum, void *ptr)
2596{
2597 char *key = vkey;
2598 struct level_datum *levdatum = datum;
2599 struct policy_data *pd = ptr;
2600 void *fp = pd->fp;
2601 __le32 buf[2];
2602 size_t len;
2603 int rc;
2604
2605 len = strlen(key);
2606 buf[0] = cpu_to_le32(len);
2607 buf[1] = cpu_to_le32(levdatum->isalias);
2608 rc = put_entry(buf, sizeof(u32), 2, fp);
2609 if (rc)
2610 return rc;
2611
2612 rc = put_entry(key, 1, len, fp);
2613 if (rc)
2614 return rc;
2615
2616 rc = mls_write_level(levdatum->level, fp);
2617 if (rc)
2618 return rc;
2619
2620 return 0;
2621}
2622
2623static int cat_write(void *vkey, void *datum, void *ptr)
2624{
2625 char *key = vkey;
2626 struct cat_datum *catdatum = datum;
2627 struct policy_data *pd = ptr;
2628 void *fp = pd->fp;
2629 __le32 buf[3];
2630 size_t len;
2631 int rc;
2632
2633 len = strlen(key);
2634 buf[0] = cpu_to_le32(len);
2635 buf[1] = cpu_to_le32(catdatum->value);
2636 buf[2] = cpu_to_le32(catdatum->isalias);
2637 rc = put_entry(buf, sizeof(u32), 3, fp);
2638 if (rc)
2639 return rc;
2640
2641 rc = put_entry(key, 1, len, fp);
2642 if (rc)
2643 return rc;
2644
2645 return 0;
2646}
2647
2648static int role_trans_write(struct policydb *p, void *fp)
2649{
2650 struct role_trans *r = p->role_tr;
2651 struct role_trans *tr;
2652 u32 buf[3];
2653 size_t nel;
2654 int rc;
2655
2656 nel = 0;
2657 for (tr = r; tr; tr = tr->next)
2658 nel++;
2659 buf[0] = cpu_to_le32(nel);
2660 rc = put_entry(buf, sizeof(u32), 1, fp);
2661 if (rc)
2662 return rc;
2663 for (tr = r; tr; tr = tr->next) {
2664 buf[0] = cpu_to_le32(tr->role);
2665 buf[1] = cpu_to_le32(tr->type);
2666 buf[2] = cpu_to_le32(tr->new_role);
2667 rc = put_entry(buf, sizeof(u32), 3, fp);
2668 if (rc)
2669 return rc;
2670 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2671 buf[0] = cpu_to_le32(tr->tclass);
2672 rc = put_entry(buf, sizeof(u32), 1, fp);
2673 if (rc)
2674 return rc;
2675 }
2676 }
2677
2678 return 0;
2679}
2680
2681static int role_allow_write(struct role_allow *r, void *fp)
2682{
2683 struct role_allow *ra;
2684 u32 buf[2];
2685 size_t nel;
2686 int rc;
2687
2688 nel = 0;
2689 for (ra = r; ra; ra = ra->next)
2690 nel++;
2691 buf[0] = cpu_to_le32(nel);
2692 rc = put_entry(buf, sizeof(u32), 1, fp);
2693 if (rc)
2694 return rc;
2695 for (ra = r; ra; ra = ra->next) {
2696 buf[0] = cpu_to_le32(ra->role);
2697 buf[1] = cpu_to_le32(ra->new_role);
2698 rc = put_entry(buf, sizeof(u32), 2, fp);
2699 if (rc)
2700 return rc;
2701 }
2702 return 0;
2703}
2704
2705/*
2706 * Write a security context structure
2707 * to a policydb binary representation file.
2708 */
2709static int context_write(struct policydb *p, struct context *c,
2710 void *fp)
2711{
2712 int rc;
2713 __le32 buf[3];
2714
2715 buf[0] = cpu_to_le32(c->user);
2716 buf[1] = cpu_to_le32(c->role);
2717 buf[2] = cpu_to_le32(c->type);
2718
2719 rc = put_entry(buf, sizeof(u32), 3, fp);
2720 if (rc)
2721 return rc;
2722
2723 rc = mls_write_range_helper(&c->range, fp);
2724 if (rc)
2725 return rc;
2726
2727 return 0;
2728}
2729
2730/*
2731 * The following *_write functions are used to
2732 * write the symbol data to a policy database
2733 * binary representation file.
2734 */
2735
2736static int perm_write(void *vkey, void *datum, void *fp)
2737{
2738 char *key = vkey;
2739 struct perm_datum *perdatum = datum;
2740 __le32 buf[2];
2741 size_t len;
2742 int rc;
2743
2744 len = strlen(key);
2745 buf[0] = cpu_to_le32(len);
2746 buf[1] = cpu_to_le32(perdatum->value);
2747 rc = put_entry(buf, sizeof(u32), 2, fp);
2748 if (rc)
2749 return rc;
2750
2751 rc = put_entry(key, 1, len, fp);
2752 if (rc)
2753 return rc;
2754
2755 return 0;
2756}
2757
2758static int common_write(void *vkey, void *datum, void *ptr)
2759{
2760 char *key = vkey;
2761 struct common_datum *comdatum = datum;
2762 struct policy_data *pd = ptr;
2763 void *fp = pd->fp;
2764 __le32 buf[4];
2765 size_t len;
2766 int rc;
2767
2768 len = strlen(key);
2769 buf[0] = cpu_to_le32(len);
2770 buf[1] = cpu_to_le32(comdatum->value);
2771 buf[2] = cpu_to_le32(comdatum->permissions.nprim);
2772 buf[3] = cpu_to_le32(comdatum->permissions.table->nel);
2773 rc = put_entry(buf, sizeof(u32), 4, fp);
2774 if (rc)
2775 return rc;
2776
2777 rc = put_entry(key, 1, len, fp);
2778 if (rc)
2779 return rc;
2780
2781 rc = hashtab_map(comdatum->permissions.table, perm_write, fp);
2782 if (rc)
2783 return rc;
2784
2785 return 0;
2786}
2787
2788static int type_set_write(struct type_set *t, void *fp)
2789{
2790 int rc;
2791 __le32 buf[1];
2792
2793 if (ebitmap_write(&t->types, fp))
2794 return -EINVAL;
2795 if (ebitmap_write(&t->negset, fp))
2796 return -EINVAL;
2797
2798 buf[0] = cpu_to_le32(t->flags);
2799 rc = put_entry(buf, sizeof(u32), 1, fp);
2800 if (rc)
2801 return -EINVAL;
2802
2803 return 0;
2804}
2805
2806static int write_cons_helper(struct policydb *p, struct constraint_node *node,
2807 void *fp)
2808{
2809 struct constraint_node *c;
2810 struct constraint_expr *e;
2811 __le32 buf[3];
2812 u32 nel;
2813 int rc;
2814
2815 for (c = node; c; c = c->next) {
2816 nel = 0;
2817 for (e = c->expr; e; e = e->next)
2818 nel++;
2819 buf[0] = cpu_to_le32(c->permissions);
2820 buf[1] = cpu_to_le32(nel);
2821 rc = put_entry(buf, sizeof(u32), 2, fp);
2822 if (rc)
2823 return rc;
2824 for (e = c->expr; e; e = e->next) {
2825 buf[0] = cpu_to_le32(e->expr_type);
2826 buf[1] = cpu_to_le32(e->attr);
2827 buf[2] = cpu_to_le32(e->op);
2828 rc = put_entry(buf, sizeof(u32), 3, fp);
2829 if (rc)
2830 return rc;
2831
2832 switch (e->expr_type) {
2833 case CEXPR_NAMES:
2834 rc = ebitmap_write(&e->names, fp);
2835 if (rc)
2836 return rc;
2837 if (p->policyvers >=
2838 POLICYDB_VERSION_CONSTRAINT_NAMES) {
2839 rc = type_set_write(e->type_names, fp);
2840 if (rc)
2841 return rc;
2842 }
2843 break;
2844 default:
2845 break;
2846 }
2847 }
2848 }
2849
2850 return 0;
2851}
2852
2853static int class_write(void *vkey, void *datum, void *ptr)
2854{
2855 char *key = vkey;
2856 struct class_datum *cladatum = datum;
2857 struct policy_data *pd = ptr;
2858 void *fp = pd->fp;
2859 struct policydb *p = pd->p;
2860 struct constraint_node *c;
2861 __le32 buf[6];
2862 u32 ncons;
2863 size_t len, len2;
2864 int rc;
2865
2866 len = strlen(key);
2867 if (cladatum->comkey)
2868 len2 = strlen(cladatum->comkey);
2869 else
2870 len2 = 0;
2871
2872 ncons = 0;
2873 for (c = cladatum->constraints; c; c = c->next)
2874 ncons++;
2875
2876 buf[0] = cpu_to_le32(len);
2877 buf[1] = cpu_to_le32(len2);
2878 buf[2] = cpu_to_le32(cladatum->value);
2879 buf[3] = cpu_to_le32(cladatum->permissions.nprim);
2880 if (cladatum->permissions.table)
2881 buf[4] = cpu_to_le32(cladatum->permissions.table->nel);
2882 else
2883 buf[4] = 0;
2884 buf[5] = cpu_to_le32(ncons);
2885 rc = put_entry(buf, sizeof(u32), 6, fp);
2886 if (rc)
2887 return rc;
2888
2889 rc = put_entry(key, 1, len, fp);
2890 if (rc)
2891 return rc;
2892
2893 if (cladatum->comkey) {
2894 rc = put_entry(cladatum->comkey, 1, len2, fp);
2895 if (rc)
2896 return rc;
2897 }
2898
2899 rc = hashtab_map(cladatum->permissions.table, perm_write, fp);
2900 if (rc)
2901 return rc;
2902
2903 rc = write_cons_helper(p, cladatum->constraints, fp);
2904 if (rc)
2905 return rc;
2906
2907 /* write out the validatetrans rule */
2908 ncons = 0;
2909 for (c = cladatum->validatetrans; c; c = c->next)
2910 ncons++;
2911
2912 buf[0] = cpu_to_le32(ncons);
2913 rc = put_entry(buf, sizeof(u32), 1, fp);
2914 if (rc)
2915 return rc;
2916
2917 rc = write_cons_helper(p, cladatum->validatetrans, fp);
2918 if (rc)
2919 return rc;
2920
2921 if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
2922 buf[0] = cpu_to_le32(cladatum->default_user);
2923 buf[1] = cpu_to_le32(cladatum->default_role);
2924 buf[2] = cpu_to_le32(cladatum->default_range);
2925
2926 rc = put_entry(buf, sizeof(uint32_t), 3, fp);
2927 if (rc)
2928 return rc;
2929 }
2930
2931 if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
2932 buf[0] = cpu_to_le32(cladatum->default_type);
2933 rc = put_entry(buf, sizeof(uint32_t), 1, fp);
2934 if (rc)
2935 return rc;
2936 }
2937
2938 return 0;
2939}
2940
2941static int role_write(void *vkey, void *datum, void *ptr)
2942{
2943 char *key = vkey;
2944 struct role_datum *role = datum;
2945 struct policy_data *pd = ptr;
2946 void *fp = pd->fp;
2947 struct policydb *p = pd->p;
2948 __le32 buf[3];
2949 size_t items, len;
2950 int rc;
2951
2952 len = strlen(key);
2953 items = 0;
2954 buf[items++] = cpu_to_le32(len);
2955 buf[items++] = cpu_to_le32(role->value);
2956 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
2957 buf[items++] = cpu_to_le32(role->bounds);
2958
2959 BUG_ON(items > ARRAY_SIZE(buf));
2960
2961 rc = put_entry(buf, sizeof(u32), items, fp);
2962 if (rc)
2963 return rc;
2964
2965 rc = put_entry(key, 1, len, fp);
2966 if (rc)
2967 return rc;
2968
2969 rc = ebitmap_write(&role->dominates, fp);
2970 if (rc)
2971 return rc;
2972
2973 rc = ebitmap_write(&role->types, fp);
2974 if (rc)
2975 return rc;
2976
2977 return 0;
2978}
2979
2980static int type_write(void *vkey, void *datum, void *ptr)
2981{
2982 char *key = vkey;
2983 struct type_datum *typdatum = datum;
2984 struct policy_data *pd = ptr;
2985 struct policydb *p = pd->p;
2986 void *fp = pd->fp;
2987 __le32 buf[4];
2988 int rc;
2989 size_t items, len;
2990
2991 len = strlen(key);
2992 items = 0;
2993 buf[items++] = cpu_to_le32(len);
2994 buf[items++] = cpu_to_le32(typdatum->value);
2995 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
2996 u32 properties = 0;
2997
2998 if (typdatum->primary)
2999 properties |= TYPEDATUM_PROPERTY_PRIMARY;
3000
3001 if (typdatum->attribute)
3002 properties |= TYPEDATUM_PROPERTY_ATTRIBUTE;
3003
3004 buf[items++] = cpu_to_le32(properties);
3005 buf[items++] = cpu_to_le32(typdatum->bounds);
3006 } else {
3007 buf[items++] = cpu_to_le32(typdatum->primary);
3008 }
3009 BUG_ON(items > ARRAY_SIZE(buf));
3010 rc = put_entry(buf, sizeof(u32), items, fp);
3011 if (rc)
3012 return rc;
3013
3014 rc = put_entry(key, 1, len, fp);
3015 if (rc)
3016 return rc;
3017
3018 return 0;
3019}
3020
3021static int user_write(void *vkey, void *datum, void *ptr)
3022{
3023 char *key = vkey;
3024 struct user_datum *usrdatum = datum;
3025 struct policy_data *pd = ptr;
3026 struct policydb *p = pd->p;
3027 void *fp = pd->fp;
3028 __le32 buf[3];
3029 size_t items, len;
3030 int rc;
3031
3032 len = strlen(key);
3033 items = 0;
3034 buf[items++] = cpu_to_le32(len);
3035 buf[items++] = cpu_to_le32(usrdatum->value);
3036 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
3037 buf[items++] = cpu_to_le32(usrdatum->bounds);
3038 BUG_ON(items > ARRAY_SIZE(buf));
3039 rc = put_entry(buf, sizeof(u32), items, fp);
3040 if (rc)
3041 return rc;
3042
3043 rc = put_entry(key, 1, len, fp);
3044 if (rc)
3045 return rc;
3046
3047 rc = ebitmap_write(&usrdatum->roles, fp);
3048 if (rc)
3049 return rc;
3050
3051 rc = mls_write_range_helper(&usrdatum->range, fp);
3052 if (rc)
3053 return rc;
3054
3055 rc = mls_write_level(&usrdatum->dfltlevel, fp);
3056 if (rc)
3057 return rc;
3058
3059 return 0;
3060}
3061
3062static int (*write_f[SYM_NUM]) (void *key, void *datum,
3063 void *datap) =
3064{
3065 common_write,
3066 class_write,
3067 role_write,
3068 type_write,
3069 user_write,
3070 cond_write_bool,
3071 sens_write,
3072 cat_write,
3073};
3074
3075static int ocontext_write(struct policydb *p, struct policydb_compat_info *info,
3076 void *fp)
3077{
3078 unsigned int i, j, rc;
3079 size_t nel, len;
3080 __be64 prefixbuf[1];
3081 __le32 buf[3];
3082 u32 nodebuf[8];
3083 struct ocontext *c;
3084 for (i = 0; i < info->ocon_num; i++) {
3085 nel = 0;
3086 for (c = p->ocontexts[i]; c; c = c->next)
3087 nel++;
3088 buf[0] = cpu_to_le32(nel);
3089 rc = put_entry(buf, sizeof(u32), 1, fp);
3090 if (rc)
3091 return rc;
3092 for (c = p->ocontexts[i]; c; c = c->next) {
3093 switch (i) {
3094 case OCON_ISID:
3095 buf[0] = cpu_to_le32(c->sid[0]);
3096 rc = put_entry(buf, sizeof(u32), 1, fp);
3097 if (rc)
3098 return rc;
3099 rc = context_write(p, &c->context[0], fp);
3100 if (rc)
3101 return rc;
3102 break;
3103 case OCON_FS:
3104 case OCON_NETIF:
3105 len = strlen(c->u.name);
3106 buf[0] = cpu_to_le32(len);
3107 rc = put_entry(buf, sizeof(u32), 1, fp);
3108 if (rc)
3109 return rc;
3110 rc = put_entry(c->u.name, 1, len, fp);
3111 if (rc)
3112 return rc;
3113 rc = context_write(p, &c->context[0], fp);
3114 if (rc)
3115 return rc;
3116 rc = context_write(p, &c->context[1], fp);
3117 if (rc)
3118 return rc;
3119 break;
3120 case OCON_PORT:
3121 buf[0] = cpu_to_le32(c->u.port.protocol);
3122 buf[1] = cpu_to_le32(c->u.port.low_port);
3123 buf[2] = cpu_to_le32(c->u.port.high_port);
3124 rc = put_entry(buf, sizeof(u32), 3, fp);
3125 if (rc)
3126 return rc;
3127 rc = context_write(p, &c->context[0], fp);
3128 if (rc)
3129 return rc;
3130 break;
3131 case OCON_NODE:
3132 nodebuf[0] = c->u.node.addr; /* network order */
3133 nodebuf[1] = c->u.node.mask; /* network order */
3134 rc = put_entry(nodebuf, sizeof(u32), 2, fp);
3135 if (rc)
3136 return rc;
3137 rc = context_write(p, &c->context[0], fp);
3138 if (rc)
3139 return rc;
3140 break;
3141 case OCON_FSUSE:
3142 buf[0] = cpu_to_le32(c->v.behavior);
3143 len = strlen(c->u.name);
3144 buf[1] = cpu_to_le32(len);
3145 rc = put_entry(buf, sizeof(u32), 2, fp);
3146 if (rc)
3147 return rc;
3148 rc = put_entry(c->u.name, 1, len, fp);
3149 if (rc)
3150 return rc;
3151 rc = context_write(p, &c->context[0], fp);
3152 if (rc)
3153 return rc;
3154 break;
3155 case OCON_NODE6:
3156 for (j = 0; j < 4; j++)
3157 nodebuf[j] = c->u.node6.addr[j]; /* network order */
3158 for (j = 0; j < 4; j++)
3159 nodebuf[j + 4] = c->u.node6.mask[j]; /* network order */
3160 rc = put_entry(nodebuf, sizeof(u32), 8, fp);
3161 if (rc)
3162 return rc;
3163 rc = context_write(p, &c->context[0], fp);
3164 if (rc)
3165 return rc;
3166 break;
3167 case OCON_IBPKEY:
3168 /* subnet_prefix is in CPU order */
3169 prefixbuf[0] = cpu_to_be64(c->u.ibpkey.subnet_prefix);
3170
3171 rc = put_entry(prefixbuf, sizeof(u64), 1, fp);
3172 if (rc)
3173 return rc;
3174
3175 buf[0] = cpu_to_le32(c->u.ibpkey.low_pkey);
3176 buf[1] = cpu_to_le32(c->u.ibpkey.high_pkey);
3177
3178 rc = put_entry(buf, sizeof(u32), 2, fp);
3179 if (rc)
3180 return rc;
3181 rc = context_write(p, &c->context[0], fp);
3182 if (rc)
3183 return rc;
3184 break;
3185 case OCON_IBENDPORT:
3186 len = strlen(c->u.ibendport.dev_name);
3187 buf[0] = cpu_to_le32(len);
3188 buf[1] = cpu_to_le32(c->u.ibendport.port);
3189 rc = put_entry(buf, sizeof(u32), 2, fp);
3190 if (rc)
3191 return rc;
3192 rc = put_entry(c->u.ibendport.dev_name, 1, len, fp);
3193 if (rc)
3194 return rc;
3195 rc = context_write(p, &c->context[0], fp);
3196 if (rc)
3197 return rc;
3198 break;
3199 }
3200 }
3201 }
3202 return 0;
3203}
3204
3205static int genfs_write(struct policydb *p, void *fp)
3206{
3207 struct genfs *genfs;
3208 struct ocontext *c;
3209 size_t len;
3210 __le32 buf[1];
3211 int rc;
3212
3213 len = 0;
3214 for (genfs = p->genfs; genfs; genfs = genfs->next)
3215 len++;
3216 buf[0] = cpu_to_le32(len);
3217 rc = put_entry(buf, sizeof(u32), 1, fp);
3218 if (rc)
3219 return rc;
3220 for (genfs = p->genfs; genfs; genfs = genfs->next) {
3221 len = strlen(genfs->fstype);
3222 buf[0] = cpu_to_le32(len);
3223 rc = put_entry(buf, sizeof(u32), 1, fp);
3224 if (rc)
3225 return rc;
3226 rc = put_entry(genfs->fstype, 1, len, fp);
3227 if (rc)
3228 return rc;
3229 len = 0;
3230 for (c = genfs->head; c; c = c->next)
3231 len++;
3232 buf[0] = cpu_to_le32(len);
3233 rc = put_entry(buf, sizeof(u32), 1, fp);
3234 if (rc)
3235 return rc;
3236 for (c = genfs->head; c; c = c->next) {
3237 len = strlen(c->u.name);
3238 buf[0] = cpu_to_le32(len);
3239 rc = put_entry(buf, sizeof(u32), 1, fp);
3240 if (rc)
3241 return rc;
3242 rc = put_entry(c->u.name, 1, len, fp);
3243 if (rc)
3244 return rc;
3245 buf[0] = cpu_to_le32(c->v.sclass);
3246 rc = put_entry(buf, sizeof(u32), 1, fp);
3247 if (rc)
3248 return rc;
3249 rc = context_write(p, &c->context[0], fp);
3250 if (rc)
3251 return rc;
3252 }
3253 }
3254 return 0;
3255}
3256
3257static int hashtab_cnt(void *key, void *data, void *ptr)
3258{
3259 int *cnt = ptr;
3260 *cnt = *cnt + 1;
3261
3262 return 0;
3263}
3264
3265static int range_write_helper(void *key, void *data, void *ptr)
3266{
3267 __le32 buf[2];
3268 struct range_trans *rt = key;
3269 struct mls_range *r = data;
3270 struct policy_data *pd = ptr;
3271 void *fp = pd->fp;
3272 struct policydb *p = pd->p;
3273 int rc;
3274
3275 buf[0] = cpu_to_le32(rt->source_type);
3276 buf[1] = cpu_to_le32(rt->target_type);
3277 rc = put_entry(buf, sizeof(u32), 2, fp);
3278 if (rc)
3279 return rc;
3280 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
3281 buf[0] = cpu_to_le32(rt->target_class);
3282 rc = put_entry(buf, sizeof(u32), 1, fp);
3283 if (rc)
3284 return rc;
3285 }
3286 rc = mls_write_range_helper(r, fp);
3287 if (rc)
3288 return rc;
3289
3290 return 0;
3291}
3292
3293static int range_write(struct policydb *p, void *fp)
3294{
3295 __le32 buf[1];
3296 int rc, nel;
3297 struct policy_data pd;
3298
3299 pd.p = p;
3300 pd.fp = fp;
3301
3302 /* count the number of entries in the hashtab */
3303 nel = 0;
3304 rc = hashtab_map(p->range_tr, hashtab_cnt, &nel);
3305 if (rc)
3306 return rc;
3307
3308 buf[0] = cpu_to_le32(nel);
3309 rc = put_entry(buf, sizeof(u32), 1, fp);
3310 if (rc)
3311 return rc;
3312
3313 /* actually write all of the entries */
3314 rc = hashtab_map(p->range_tr, range_write_helper, &pd);
3315 if (rc)
3316 return rc;
3317
3318 return 0;
3319}
3320
3321static int filename_write_helper(void *key, void *data, void *ptr)
3322{
3323 __le32 buf[4];
3324 struct filename_trans *ft = key;
3325 struct filename_trans_datum *otype = data;
3326 void *fp = ptr;
3327 int rc;
3328 u32 len;
3329
3330 len = strlen(ft->name);
3331 buf[0] = cpu_to_le32(len);
3332 rc = put_entry(buf, sizeof(u32), 1, fp);
3333 if (rc)
3334 return rc;
3335
3336 rc = put_entry(ft->name, sizeof(char), len, fp);
3337 if (rc)
3338 return rc;
3339
3340 buf[0] = cpu_to_le32(ft->stype);
3341 buf[1] = cpu_to_le32(ft->ttype);
3342 buf[2] = cpu_to_le32(ft->tclass);
3343 buf[3] = cpu_to_le32(otype->otype);
3344
3345 rc = put_entry(buf, sizeof(u32), 4, fp);
3346 if (rc)
3347 return rc;
3348
3349 return 0;
3350}
3351
3352static int filename_trans_write(struct policydb *p, void *fp)
3353{
3354 u32 nel;
3355 __le32 buf[1];
3356 int rc;
3357
3358 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
3359 return 0;
3360
3361 nel = 0;
3362 rc = hashtab_map(p->filename_trans, hashtab_cnt, &nel);
3363 if (rc)
3364 return rc;
3365
3366 buf[0] = cpu_to_le32(nel);
3367 rc = put_entry(buf, sizeof(u32), 1, fp);
3368 if (rc)
3369 return rc;
3370
3371 rc = hashtab_map(p->filename_trans, filename_write_helper, fp);
3372 if (rc)
3373 return rc;
3374
3375 return 0;
3376}
3377
3378/*
3379 * Write the configuration data in a policy database
3380 * structure to a policy database binary representation
3381 * file.
3382 */
3383int policydb_write(struct policydb *p, void *fp)
3384{
3385 unsigned int i, num_syms;
3386 int rc;
3387 __le32 buf[4];
3388 u32 config;
3389 size_t len;
3390 struct policydb_compat_info *info;
3391
3392 /*
3393 * refuse to write policy older than compressed avtab
3394 * to simplify the writer. There are other tests dropped
3395 * since we assume this throughout the writer code. Be
3396 * careful if you ever try to remove this restriction
3397 */
3398 if (p->policyvers < POLICYDB_VERSION_AVTAB) {
3399 pr_err("SELinux: refusing to write policy version %d."
3400 " Because it is less than version %d\n", p->policyvers,
3401 POLICYDB_VERSION_AVTAB);
3402 return -EINVAL;
3403 }
3404
3405 config = 0;
3406 if (p->mls_enabled)
3407 config |= POLICYDB_CONFIG_MLS;
3408
3409 if (p->reject_unknown)
3410 config |= REJECT_UNKNOWN;
3411 if (p->allow_unknown)
3412 config |= ALLOW_UNKNOWN;
3413
3414 /* Write the magic number and string identifiers. */
3415 buf[0] = cpu_to_le32(POLICYDB_MAGIC);
3416 len = strlen(POLICYDB_STRING);
3417 buf[1] = cpu_to_le32(len);
3418 rc = put_entry(buf, sizeof(u32), 2, fp);
3419 if (rc)
3420 return rc;
3421 rc = put_entry(POLICYDB_STRING, 1, len, fp);
3422 if (rc)
3423 return rc;
3424
3425 /* Write the version, config, and table sizes. */
3426 info = policydb_lookup_compat(p->policyvers);
3427 if (!info) {
3428 pr_err("SELinux: compatibility lookup failed for policy "
3429 "version %d", p->policyvers);
3430 return -EINVAL;
3431 }
3432
3433 buf[0] = cpu_to_le32(p->policyvers);
3434 buf[1] = cpu_to_le32(config);
3435 buf[2] = cpu_to_le32(info->sym_num);
3436 buf[3] = cpu_to_le32(info->ocon_num);
3437
3438 rc = put_entry(buf, sizeof(u32), 4, fp);
3439 if (rc)
3440 return rc;
3441
3442 if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
3443 rc = ebitmap_write(&p->policycaps, fp);
3444 if (rc)
3445 return rc;
3446 }
3447
3448 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
3449 rc = ebitmap_write(&p->permissive_map, fp);
3450 if (rc)
3451 return rc;
3452 }
3453
3454 num_syms = info->sym_num;
3455 for (i = 0; i < num_syms; i++) {
3456 struct policy_data pd;
3457
3458 pd.fp = fp;
3459 pd.p = p;
3460
3461 buf[0] = cpu_to_le32(p->symtab[i].nprim);
3462 buf[1] = cpu_to_le32(p->symtab[i].table->nel);
3463
3464 rc = put_entry(buf, sizeof(u32), 2, fp);
3465 if (rc)
3466 return rc;
3467 rc = hashtab_map(p->symtab[i].table, write_f[i], &pd);
3468 if (rc)
3469 return rc;
3470 }
3471
3472 rc = avtab_write(p, &p->te_avtab, fp);
3473 if (rc)
3474 return rc;
3475
3476 rc = cond_write_list(p, p->cond_list, fp);
3477 if (rc)
3478 return rc;
3479
3480 rc = role_trans_write(p, fp);
3481 if (rc)
3482 return rc;
3483
3484 rc = role_allow_write(p->role_allow, fp);
3485 if (rc)
3486 return rc;
3487
3488 rc = filename_trans_write(p, fp);
3489 if (rc)
3490 return rc;
3491
3492 rc = ocontext_write(p, info, fp);
3493 if (rc)
3494 return rc;
3495
3496 rc = genfs_write(p, fp);
3497 if (rc)
3498 return rc;
3499
3500 rc = range_write(p, fp);
3501 if (rc)
3502 return rc;
3503
3504 for (i = 0; i < p->p_types.nprim; i++) {
3505 struct ebitmap *e = &p->type_attr_map_array[i];
3506
3507 rc = ebitmap_write(e, fp);
3508 if (rc)
3509 return rc;
3510 }
3511
3512 return 0;
3513}