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