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