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