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