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