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