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