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