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