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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// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Implementation of the policy database.
4 *
5 * Author : Stephen Smalley, <sds@tycho.nsa.gov>
6 */
7
8/*
9 * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
10 *
11 * Support for enhanced MLS infrastructure.
12 *
13 * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
14 *
15 * Added conditional policy language extensions
16 *
17 * Updated: Hewlett-Packard <paul@paul-moore.com>
18 *
19 * Added support for the policy capability bitmap
20 *
21 * Update: Mellanox Techonologies
22 *
23 * Added Infiniband support
24 *
25 * Copyright (C) 2016 Mellanox Techonologies
26 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
27 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
28 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
29 */
30
31#include <linux/kernel.h>
32#include <linux/sched.h>
33#include <linux/slab.h>
34#include <linux/string.h>
35#include <linux/errno.h>
36#include <linux/audit.h>
37#include "security.h"
38
39#include "policydb.h"
40#include "conditional.h"
41#include "mls.h"
42#include "services.h"
43
44#define _DEBUG_HASHES
45
46#ifdef DEBUG_HASHES
47static const char *symtab_name[SYM_NUM] = {
48 "common prefixes",
49 "classes",
50 "roles",
51 "types",
52 "users",
53 "bools",
54 "levels",
55 "categories",
56};
57#endif
58
59struct policydb_compat_info {
60 int version;
61 int sym_num;
62 int ocon_num;
63};
64
65/* These need to be updated if SYM_NUM or OCON_NUM changes */
66static struct policydb_compat_info policydb_compat[] = {
67 {
68 .version = POLICYDB_VERSION_BASE,
69 .sym_num = SYM_NUM - 3,
70 .ocon_num = OCON_NUM - 3,
71 },
72 {
73 .version = POLICYDB_VERSION_BOOL,
74 .sym_num = SYM_NUM - 2,
75 .ocon_num = OCON_NUM - 3,
76 },
77 {
78 .version = POLICYDB_VERSION_IPV6,
79 .sym_num = SYM_NUM - 2,
80 .ocon_num = OCON_NUM - 2,
81 },
82 {
83 .version = POLICYDB_VERSION_NLCLASS,
84 .sym_num = SYM_NUM - 2,
85 .ocon_num = OCON_NUM - 2,
86 },
87 {
88 .version = POLICYDB_VERSION_MLS,
89 .sym_num = SYM_NUM,
90 .ocon_num = OCON_NUM - 2,
91 },
92 {
93 .version = POLICYDB_VERSION_AVTAB,
94 .sym_num = SYM_NUM,
95 .ocon_num = OCON_NUM - 2,
96 },
97 {
98 .version = POLICYDB_VERSION_RANGETRANS,
99 .sym_num = SYM_NUM,
100 .ocon_num = OCON_NUM - 2,
101 },
102 {
103 .version = POLICYDB_VERSION_POLCAP,
104 .sym_num = SYM_NUM,
105 .ocon_num = OCON_NUM - 2,
106 },
107 {
108 .version = POLICYDB_VERSION_PERMISSIVE,
109 .sym_num = SYM_NUM,
110 .ocon_num = OCON_NUM - 2,
111 },
112 {
113 .version = POLICYDB_VERSION_BOUNDARY,
114 .sym_num = SYM_NUM,
115 .ocon_num = OCON_NUM - 2,
116 },
117 {
118 .version = POLICYDB_VERSION_FILENAME_TRANS,
119 .sym_num = SYM_NUM,
120 .ocon_num = OCON_NUM - 2,
121 },
122 {
123 .version = POLICYDB_VERSION_ROLETRANS,
124 .sym_num = SYM_NUM,
125 .ocon_num = OCON_NUM - 2,
126 },
127 {
128 .version = POLICYDB_VERSION_NEW_OBJECT_DEFAULTS,
129 .sym_num = SYM_NUM,
130 .ocon_num = OCON_NUM - 2,
131 },
132 {
133 .version = POLICYDB_VERSION_DEFAULT_TYPE,
134 .sym_num = SYM_NUM,
135 .ocon_num = OCON_NUM - 2,
136 },
137 {
138 .version = POLICYDB_VERSION_CONSTRAINT_NAMES,
139 .sym_num = SYM_NUM,
140 .ocon_num = OCON_NUM - 2,
141 },
142 {
143 .version = POLICYDB_VERSION_XPERMS_IOCTL,
144 .sym_num = SYM_NUM,
145 .ocon_num = OCON_NUM - 2,
146 },
147 {
148 .version = POLICYDB_VERSION_INFINIBAND,
149 .sym_num = SYM_NUM,
150 .ocon_num = OCON_NUM,
151 },
152 {
153 .version = POLICYDB_VERSION_GLBLUB,
154 .sym_num = SYM_NUM,
155 .ocon_num = OCON_NUM,
156 },
157 {
158 .version = POLICYDB_VERSION_COMP_FTRANS,
159 .sym_num = SYM_NUM,
160 .ocon_num = OCON_NUM,
161 },
162};
163
164static struct policydb_compat_info *policydb_lookup_compat(int version)
165{
166 int i;
167 struct policydb_compat_info *info = NULL;
168
169 for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) {
170 if (policydb_compat[i].version == version) {
171 info = &policydb_compat[i];
172 break;
173 }
174 }
175 return info;
176}
177
178/*
179 * The following *_destroy functions are used to
180 * free any memory allocated for each kind of
181 * symbol data in the policy database.
182 */
183
184static int perm_destroy(void *key, void *datum, void *p)
185{
186 kfree(key);
187 kfree(datum);
188 return 0;
189}
190
191static int common_destroy(void *key, void *datum, void *p)
192{
193 struct common_datum *comdatum;
194
195 kfree(key);
196 if (datum) {
197 comdatum = datum;
198 hashtab_map(&comdatum->permissions.table, perm_destroy, NULL);
199 hashtab_destroy(&comdatum->permissions.table);
200 }
201 kfree(datum);
202 return 0;
203}
204
205static void constraint_expr_destroy(struct constraint_expr *expr)
206{
207 if (expr) {
208 ebitmap_destroy(&expr->names);
209 if (expr->type_names) {
210 ebitmap_destroy(&expr->type_names->types);
211 ebitmap_destroy(&expr->type_names->negset);
212 kfree(expr->type_names);
213 }
214 kfree(expr);
215 }
216}
217
218static int cls_destroy(void *key, void *datum, void *p)
219{
220 struct class_datum *cladatum;
221 struct constraint_node *constraint, *ctemp;
222 struct constraint_expr *e, *etmp;
223
224 kfree(key);
225 if (datum) {
226 cladatum = datum;
227 hashtab_map(&cladatum->permissions.table, perm_destroy, NULL);
228 hashtab_destroy(&cladatum->permissions.table);
229 constraint = cladatum->constraints;
230 while (constraint) {
231 e = constraint->expr;
232 while (e) {
233 etmp = e;
234 e = e->next;
235 constraint_expr_destroy(etmp);
236 }
237 ctemp = constraint;
238 constraint = constraint->next;
239 kfree(ctemp);
240 }
241
242 constraint = cladatum->validatetrans;
243 while (constraint) {
244 e = constraint->expr;
245 while (e) {
246 etmp = e;
247 e = e->next;
248 constraint_expr_destroy(etmp);
249 }
250 ctemp = constraint;
251 constraint = constraint->next;
252 kfree(ctemp);
253 }
254 kfree(cladatum->comkey);
255 }
256 kfree(datum);
257 return 0;
258}
259
260static int role_destroy(void *key, void *datum, void *p)
261{
262 struct role_datum *role;
263
264 kfree(key);
265 if (datum) {
266 role = datum;
267 ebitmap_destroy(&role->dominates);
268 ebitmap_destroy(&role->types);
269 }
270 kfree(datum);
271 return 0;
272}
273
274static int type_destroy(void *key, void *datum, void *p)
275{
276 kfree(key);
277 kfree(datum);
278 return 0;
279}
280
281static int user_destroy(void *key, void *datum, void *p)
282{
283 struct user_datum *usrdatum;
284
285 kfree(key);
286 if (datum) {
287 usrdatum = datum;
288 ebitmap_destroy(&usrdatum->roles);
289 ebitmap_destroy(&usrdatum->range.level[0].cat);
290 ebitmap_destroy(&usrdatum->range.level[1].cat);
291 ebitmap_destroy(&usrdatum->dfltlevel.cat);
292 }
293 kfree(datum);
294 return 0;
295}
296
297static int sens_destroy(void *key, void *datum, void *p)
298{
299 struct level_datum *levdatum;
300
301 kfree(key);
302 if (datum) {
303 levdatum = datum;
304 if (levdatum->level)
305 ebitmap_destroy(&levdatum->level->cat);
306 kfree(levdatum->level);
307 }
308 kfree(datum);
309 return 0;
310}
311
312static int cat_destroy(void *key, void *datum, void *p)
313{
314 kfree(key);
315 kfree(datum);
316 return 0;
317}
318
319static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) =
320{
321 common_destroy,
322 cls_destroy,
323 role_destroy,
324 type_destroy,
325 user_destroy,
326 cond_destroy_bool,
327 sens_destroy,
328 cat_destroy,
329};
330
331static int filenametr_destroy(void *key, void *datum, void *p)
332{
333 struct filename_trans_key *ft = key;
334 struct filename_trans_datum *next, *d = datum;
335
336 kfree(ft->name);
337 kfree(key);
338 do {
339 ebitmap_destroy(&d->stypes);
340 next = d->next;
341 kfree(d);
342 d = next;
343 } while (unlikely(d));
344 cond_resched();
345 return 0;
346}
347
348static int range_tr_destroy(void *key, void *datum, void *p)
349{
350 struct mls_range *rt = datum;
351
352 kfree(key);
353 ebitmap_destroy(&rt->level[0].cat);
354 ebitmap_destroy(&rt->level[1].cat);
355 kfree(datum);
356 cond_resched();
357 return 0;
358}
359
360static int role_tr_destroy(void *key, void *datum, void *p)
361{
362 kfree(key);
363 kfree(datum);
364 return 0;
365}
366
367static void ocontext_destroy(struct ocontext *c, int i)
368{
369 if (!c)
370 return;
371
372 context_destroy(&c->context[0]);
373 context_destroy(&c->context[1]);
374 if (i == OCON_ISID || i == OCON_FS ||
375 i == OCON_NETIF || i == OCON_FSUSE)
376 kfree(c->u.name);
377 kfree(c);
378}
379
380/*
381 * Initialize the role table.
382 */
383static int roles_init(struct policydb *p)
384{
385 char *key = NULL;
386 int rc;
387 struct role_datum *role;
388
389 role = kzalloc(sizeof(*role), GFP_KERNEL);
390 if (!role)
391 return -ENOMEM;
392
393 rc = -EINVAL;
394 role->value = ++p->p_roles.nprim;
395 if (role->value != OBJECT_R_VAL)
396 goto out;
397
398 rc = -ENOMEM;
399 key = kstrdup(OBJECT_R, GFP_KERNEL);
400 if (!key)
401 goto out;
402
403 rc = symtab_insert(&p->p_roles, key, role);
404 if (rc)
405 goto out;
406
407 return 0;
408out:
409 kfree(key);
410 kfree(role);
411 return rc;
412}
413
414static u32 filenametr_hash(const void *k)
415{
416 const struct filename_trans_key *ft = k;
417 unsigned long hash;
418 unsigned int byte_num;
419 unsigned char focus;
420
421 hash = ft->ttype ^ ft->tclass;
422
423 byte_num = 0;
424 while ((focus = ft->name[byte_num++]))
425 hash = partial_name_hash(focus, hash);
426 return hash;
427}
428
429static int filenametr_cmp(const void *k1, const void *k2)
430{
431 const struct filename_trans_key *ft1 = k1;
432 const struct filename_trans_key *ft2 = k2;
433 int v;
434
435 v = ft1->ttype - ft2->ttype;
436 if (v)
437 return v;
438
439 v = ft1->tclass - ft2->tclass;
440 if (v)
441 return v;
442
443 return strcmp(ft1->name, ft2->name);
444
445}
446
447static const struct hashtab_key_params filenametr_key_params = {
448 .hash = filenametr_hash,
449 .cmp = filenametr_cmp,
450};
451
452struct filename_trans_datum *policydb_filenametr_search(
453 struct policydb *p, struct filename_trans_key *key)
454{
455 return hashtab_search(&p->filename_trans, key, filenametr_key_params);
456}
457
458static u32 rangetr_hash(const void *k)
459{
460 const struct range_trans *key = k;
461
462 return key->source_type + (key->target_type << 3) +
463 (key->target_class << 5);
464}
465
466static int rangetr_cmp(const void *k1, const void *k2)
467{
468 const struct range_trans *key1 = k1, *key2 = k2;
469 int v;
470
471 v = key1->source_type - key2->source_type;
472 if (v)
473 return v;
474
475 v = key1->target_type - key2->target_type;
476 if (v)
477 return v;
478
479 v = key1->target_class - key2->target_class;
480
481 return v;
482}
483
484static const struct hashtab_key_params rangetr_key_params = {
485 .hash = rangetr_hash,
486 .cmp = rangetr_cmp,
487};
488
489struct mls_range *policydb_rangetr_search(struct policydb *p,
490 struct range_trans *key)
491{
492 return hashtab_search(&p->range_tr, key, rangetr_key_params);
493}
494
495static u32 role_trans_hash(const void *k)
496{
497 const struct role_trans_key *key = k;
498
499 return key->role + (key->type << 3) + (key->tclass << 5);
500}
501
502static int role_trans_cmp(const void *k1, const void *k2)
503{
504 const struct role_trans_key *key1 = k1, *key2 = k2;
505 int v;
506
507 v = key1->role - key2->role;
508 if (v)
509 return v;
510
511 v = key1->type - key2->type;
512 if (v)
513 return v;
514
515 return key1->tclass - key2->tclass;
516}
517
518static const struct hashtab_key_params roletr_key_params = {
519 .hash = role_trans_hash,
520 .cmp = role_trans_cmp,
521};
522
523struct role_trans_datum *policydb_roletr_search(struct policydb *p,
524 struct role_trans_key *key)
525{
526 return hashtab_search(&p->role_tr, key, roletr_key_params);
527}
528
529/*
530 * Initialize a policy database structure.
531 */
532static void policydb_init(struct policydb *p)
533{
534 memset(p, 0, sizeof(*p));
535
536 avtab_init(&p->te_avtab);
537 cond_policydb_init(p);
538
539 ebitmap_init(&p->filename_trans_ttypes);
540 ebitmap_init(&p->policycaps);
541 ebitmap_init(&p->permissive_map);
542}
543
544/*
545 * The following *_index functions are used to
546 * define the val_to_name and val_to_struct arrays
547 * in a policy database structure. The val_to_name
548 * arrays are used when converting security context
549 * structures into string representations. The
550 * val_to_struct arrays are used when the attributes
551 * of a class, role, or user are needed.
552 */
553
554static int common_index(void *key, void *datum, void *datap)
555{
556 struct policydb *p;
557 struct common_datum *comdatum;
558
559 comdatum = datum;
560 p = datap;
561 if (!comdatum->value || comdatum->value > p->p_commons.nprim)
562 return -EINVAL;
563
564 p->sym_val_to_name[SYM_COMMONS][comdatum->value - 1] = key;
565
566 return 0;
567}
568
569static int class_index(void *key, void *datum, void *datap)
570{
571 struct policydb *p;
572 struct class_datum *cladatum;
573
574 cladatum = datum;
575 p = datap;
576 if (!cladatum->value || cladatum->value > p->p_classes.nprim)
577 return -EINVAL;
578
579 p->sym_val_to_name[SYM_CLASSES][cladatum->value - 1] = key;
580 p->class_val_to_struct[cladatum->value - 1] = cladatum;
581 return 0;
582}
583
584static int role_index(void *key, void *datum, void *datap)
585{
586 struct policydb *p;
587 struct role_datum *role;
588
589 role = datum;
590 p = datap;
591 if (!role->value
592 || role->value > p->p_roles.nprim
593 || role->bounds > p->p_roles.nprim)
594 return -EINVAL;
595
596 p->sym_val_to_name[SYM_ROLES][role->value - 1] = key;
597 p->role_val_to_struct[role->value - 1] = role;
598 return 0;
599}
600
601static int type_index(void *key, void *datum, void *datap)
602{
603 struct policydb *p;
604 struct type_datum *typdatum;
605
606 typdatum = datum;
607 p = datap;
608
609 if (typdatum->primary) {
610 if (!typdatum->value
611 || typdatum->value > p->p_types.nprim
612 || typdatum->bounds > p->p_types.nprim)
613 return -EINVAL;
614 p->sym_val_to_name[SYM_TYPES][typdatum->value - 1] = key;
615 p->type_val_to_struct[typdatum->value - 1] = typdatum;
616 }
617
618 return 0;
619}
620
621static int user_index(void *key, void *datum, void *datap)
622{
623 struct policydb *p;
624 struct user_datum *usrdatum;
625
626 usrdatum = datum;
627 p = datap;
628 if (!usrdatum->value
629 || usrdatum->value > p->p_users.nprim
630 || usrdatum->bounds > p->p_users.nprim)
631 return -EINVAL;
632
633 p->sym_val_to_name[SYM_USERS][usrdatum->value - 1] = key;
634 p->user_val_to_struct[usrdatum->value - 1] = usrdatum;
635 return 0;
636}
637
638static int sens_index(void *key, void *datum, void *datap)
639{
640 struct policydb *p;
641 struct level_datum *levdatum;
642
643 levdatum = datum;
644 p = datap;
645
646 if (!levdatum->isalias) {
647 if (!levdatum->level->sens ||
648 levdatum->level->sens > p->p_levels.nprim)
649 return -EINVAL;
650
651 p->sym_val_to_name[SYM_LEVELS][levdatum->level->sens - 1] = key;
652 }
653
654 return 0;
655}
656
657static int cat_index(void *key, void *datum, void *datap)
658{
659 struct policydb *p;
660 struct cat_datum *catdatum;
661
662 catdatum = datum;
663 p = datap;
664
665 if (!catdatum->isalias) {
666 if (!catdatum->value || catdatum->value > p->p_cats.nprim)
667 return -EINVAL;
668
669 p->sym_val_to_name[SYM_CATS][catdatum->value - 1] = key;
670 }
671
672 return 0;
673}
674
675static int (*index_f[SYM_NUM]) (void *key, void *datum, void *datap) =
676{
677 common_index,
678 class_index,
679 role_index,
680 type_index,
681 user_index,
682 cond_index_bool,
683 sens_index,
684 cat_index,
685};
686
687#ifdef DEBUG_HASHES
688static void hash_eval(struct hashtab *h, const char *hash_name)
689{
690 struct hashtab_info info;
691
692 hashtab_stat(h, &info);
693 pr_debug("SELinux: %s: %d entries and %d/%d buckets used, longest chain length %d\n",
694 hash_name, h->nel, info.slots_used, h->size,
695 info.max_chain_len);
696}
697
698static void symtab_hash_eval(struct symtab *s)
699{
700 int i;
701
702 for (i = 0; i < SYM_NUM; i++)
703 hash_eval(&s[i].table, symtab_name[i]);
704}
705
706#else
707static inline void hash_eval(struct hashtab *h, char *hash_name)
708{
709}
710#endif
711
712/*
713 * Define the other val_to_name and val_to_struct arrays
714 * in a policy database structure.
715 *
716 * Caller must clean up on failure.
717 */
718static int policydb_index(struct policydb *p)
719{
720 int i, rc;
721
722 if (p->mls_enabled)
723 pr_debug("SELinux: %d users, %d roles, %d types, %d bools, %d sens, %d cats\n",
724 p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim,
725 p->p_bools.nprim, p->p_levels.nprim, p->p_cats.nprim);
726 else
727 pr_debug("SELinux: %d users, %d roles, %d types, %d bools\n",
728 p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim,
729 p->p_bools.nprim);
730
731 pr_debug("SELinux: %d classes, %d rules\n",
732 p->p_classes.nprim, p->te_avtab.nel);
733
734#ifdef DEBUG_HASHES
735 avtab_hash_eval(&p->te_avtab, "rules");
736 symtab_hash_eval(p->symtab);
737#endif
738
739 p->class_val_to_struct = kcalloc(p->p_classes.nprim,
740 sizeof(*p->class_val_to_struct),
741 GFP_KERNEL);
742 if (!p->class_val_to_struct)
743 return -ENOMEM;
744
745 p->role_val_to_struct = kcalloc(p->p_roles.nprim,
746 sizeof(*p->role_val_to_struct),
747 GFP_KERNEL);
748 if (!p->role_val_to_struct)
749 return -ENOMEM;
750
751 p->user_val_to_struct = kcalloc(p->p_users.nprim,
752 sizeof(*p->user_val_to_struct),
753 GFP_KERNEL);
754 if (!p->user_val_to_struct)
755 return -ENOMEM;
756
757 p->type_val_to_struct = kvcalloc(p->p_types.nprim,
758 sizeof(*p->type_val_to_struct),
759 GFP_KERNEL);
760 if (!p->type_val_to_struct)
761 return -ENOMEM;
762
763 rc = cond_init_bool_indexes(p);
764 if (rc)
765 goto out;
766
767 for (i = 0; i < SYM_NUM; i++) {
768 p->sym_val_to_name[i] = kvcalloc(p->symtab[i].nprim,
769 sizeof(char *),
770 GFP_KERNEL);
771 if (!p->sym_val_to_name[i])
772 return -ENOMEM;
773
774 rc = hashtab_map(&p->symtab[i].table, index_f[i], p);
775 if (rc)
776 goto out;
777 }
778 rc = 0;
779out:
780 return rc;
781}
782
783/*
784 * Free any memory allocated by a policy database structure.
785 */
786void policydb_destroy(struct policydb *p)
787{
788 struct ocontext *c, *ctmp;
789 struct genfs *g, *gtmp;
790 int i;
791 struct role_allow *ra, *lra = NULL;
792
793 for (i = 0; i < SYM_NUM; i++) {
794 cond_resched();
795 hashtab_map(&p->symtab[i].table, destroy_f[i], NULL);
796 hashtab_destroy(&p->symtab[i].table);
797 }
798
799 for (i = 0; i < SYM_NUM; i++)
800 kvfree(p->sym_val_to_name[i]);
801
802 kfree(p->class_val_to_struct);
803 kfree(p->role_val_to_struct);
804 kfree(p->user_val_to_struct);
805 kvfree(p->type_val_to_struct);
806
807 avtab_destroy(&p->te_avtab);
808
809 for (i = 0; i < OCON_NUM; i++) {
810 cond_resched();
811 c = p->ocontexts[i];
812 while (c) {
813 ctmp = c;
814 c = c->next;
815 ocontext_destroy(ctmp, i);
816 }
817 p->ocontexts[i] = NULL;
818 }
819
820 g = p->genfs;
821 while (g) {
822 cond_resched();
823 kfree(g->fstype);
824 c = g->head;
825 while (c) {
826 ctmp = c;
827 c = c->next;
828 ocontext_destroy(ctmp, OCON_FSUSE);
829 }
830 gtmp = g;
831 g = g->next;
832 kfree(gtmp);
833 }
834 p->genfs = NULL;
835
836 cond_policydb_destroy(p);
837
838 hashtab_map(&p->role_tr, role_tr_destroy, NULL);
839 hashtab_destroy(&p->role_tr);
840
841 for (ra = p->role_allow; ra; ra = ra->next) {
842 cond_resched();
843 kfree(lra);
844 lra = ra;
845 }
846 kfree(lra);
847
848 hashtab_map(&p->filename_trans, filenametr_destroy, NULL);
849 hashtab_destroy(&p->filename_trans);
850
851 hashtab_map(&p->range_tr, range_tr_destroy, NULL);
852 hashtab_destroy(&p->range_tr);
853
854 if (p->type_attr_map_array) {
855 for (i = 0; i < p->p_types.nprim; i++)
856 ebitmap_destroy(&p->type_attr_map_array[i]);
857 kvfree(p->type_attr_map_array);
858 }
859
860 ebitmap_destroy(&p->filename_trans_ttypes);
861 ebitmap_destroy(&p->policycaps);
862 ebitmap_destroy(&p->permissive_map);
863}
864
865/*
866 * Load the initial SIDs specified in a policy database
867 * structure into a SID table.
868 */
869int policydb_load_isids(struct policydb *p, struct sidtab *s)
870{
871 struct ocontext *head, *c;
872 int rc;
873
874 rc = sidtab_init(s);
875 if (rc) {
876 pr_err("SELinux: out of memory on SID table init\n");
877 return rc;
878 }
879
880 head = p->ocontexts[OCON_ISID];
881 for (c = head; c; c = c->next) {
882 u32 sid = c->sid[0];
883 const char *name = security_get_initial_sid_context(sid);
884
885 if (sid == SECSID_NULL) {
886 pr_err("SELinux: SID 0 was assigned a context.\n");
887 sidtab_destroy(s);
888 return -EINVAL;
889 }
890
891 /* Ignore initial SIDs unused by this kernel. */
892 if (!name)
893 continue;
894
895 rc = sidtab_set_initial(s, sid, &c->context[0]);
896 if (rc) {
897 pr_err("SELinux: unable to load initial SID %s.\n",
898 name);
899 sidtab_destroy(s);
900 return rc;
901 }
902 }
903 return 0;
904}
905
906int policydb_class_isvalid(struct policydb *p, unsigned int class)
907{
908 if (!class || class > p->p_classes.nprim)
909 return 0;
910 return 1;
911}
912
913int policydb_role_isvalid(struct policydb *p, unsigned int role)
914{
915 if (!role || role > p->p_roles.nprim)
916 return 0;
917 return 1;
918}
919
920int policydb_type_isvalid(struct policydb *p, unsigned int type)
921{
922 if (!type || type > p->p_types.nprim)
923 return 0;
924 return 1;
925}
926
927/*
928 * Return 1 if the fields in the security context
929 * structure `c' are valid. Return 0 otherwise.
930 */
931int policydb_context_isvalid(struct policydb *p, struct context *c)
932{
933 struct role_datum *role;
934 struct user_datum *usrdatum;
935
936 if (!c->role || c->role > p->p_roles.nprim)
937 return 0;
938
939 if (!c->user || c->user > p->p_users.nprim)
940 return 0;
941
942 if (!c->type || c->type > p->p_types.nprim)
943 return 0;
944
945 if (c->role != OBJECT_R_VAL) {
946 /*
947 * Role must be authorized for the type.
948 */
949 role = p->role_val_to_struct[c->role - 1];
950 if (!role || !ebitmap_get_bit(&role->types, c->type - 1))
951 /* role may not be associated with type */
952 return 0;
953
954 /*
955 * User must be authorized for the role.
956 */
957 usrdatum = p->user_val_to_struct[c->user - 1];
958 if (!usrdatum)
959 return 0;
960
961 if (!ebitmap_get_bit(&usrdatum->roles, c->role - 1))
962 /* user may not be associated with role */
963 return 0;
964 }
965
966 if (!mls_context_isvalid(p, c))
967 return 0;
968
969 return 1;
970}
971
972/*
973 * Read a MLS range structure from a policydb binary
974 * representation file.
975 */
976static int mls_read_range_helper(struct mls_range *r, void *fp)
977{
978 __le32 buf[2];
979 u32 items;
980 int rc;
981
982 rc = next_entry(buf, fp, sizeof(u32));
983 if (rc)
984 goto out;
985
986 rc = -EINVAL;
987 items = le32_to_cpu(buf[0]);
988 if (items > ARRAY_SIZE(buf)) {
989 pr_err("SELinux: mls: range overflow\n");
990 goto out;
991 }
992
993 rc = next_entry(buf, fp, sizeof(u32) * items);
994 if (rc) {
995 pr_err("SELinux: mls: truncated range\n");
996 goto out;
997 }
998
999 r->level[0].sens = le32_to_cpu(buf[0]);
1000 if (items > 1)
1001 r->level[1].sens = le32_to_cpu(buf[1]);
1002 else
1003 r->level[1].sens = r->level[0].sens;
1004
1005 rc = ebitmap_read(&r->level[0].cat, fp);
1006 if (rc) {
1007 pr_err("SELinux: mls: error reading low categories\n");
1008 goto out;
1009 }
1010 if (items > 1) {
1011 rc = ebitmap_read(&r->level[1].cat, fp);
1012 if (rc) {
1013 pr_err("SELinux: mls: error reading high categories\n");
1014 goto bad_high;
1015 }
1016 } else {
1017 rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat);
1018 if (rc) {
1019 pr_err("SELinux: mls: out of memory\n");
1020 goto bad_high;
1021 }
1022 }
1023
1024 return 0;
1025bad_high:
1026 ebitmap_destroy(&r->level[0].cat);
1027out:
1028 return rc;
1029}
1030
1031/*
1032 * Read and validate a security context structure
1033 * from a policydb binary representation file.
1034 */
1035static int context_read_and_validate(struct context *c,
1036 struct policydb *p,
1037 void *fp)
1038{
1039 __le32 buf[3];
1040 int rc;
1041
1042 rc = next_entry(buf, fp, sizeof buf);
1043 if (rc) {
1044 pr_err("SELinux: context truncated\n");
1045 goto out;
1046 }
1047 c->user = le32_to_cpu(buf[0]);
1048 c->role = le32_to_cpu(buf[1]);
1049 c->type = le32_to_cpu(buf[2]);
1050 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1051 rc = mls_read_range_helper(&c->range, fp);
1052 if (rc) {
1053 pr_err("SELinux: error reading MLS range of context\n");
1054 goto out;
1055 }
1056 }
1057
1058 rc = -EINVAL;
1059 if (!policydb_context_isvalid(p, c)) {
1060 pr_err("SELinux: invalid security context\n");
1061 context_destroy(c);
1062 goto out;
1063 }
1064 rc = 0;
1065out:
1066 return rc;
1067}
1068
1069/*
1070 * The following *_read functions are used to
1071 * read the symbol data from a policy database
1072 * binary representation file.
1073 */
1074
1075static int str_read(char **strp, gfp_t flags, void *fp, u32 len)
1076{
1077 int rc;
1078 char *str;
1079
1080 if ((len == 0) || (len == (u32)-1))
1081 return -EINVAL;
1082
1083 str = kmalloc(len + 1, flags | __GFP_NOWARN);
1084 if (!str)
1085 return -ENOMEM;
1086
1087 rc = next_entry(str, fp, len);
1088 if (rc) {
1089 kfree(str);
1090 return rc;
1091 }
1092
1093 str[len] = '\0';
1094 *strp = str;
1095 return 0;
1096}
1097
1098static int perm_read(struct policydb *p, struct symtab *s, void *fp)
1099{
1100 char *key = NULL;
1101 struct perm_datum *perdatum;
1102 int rc;
1103 __le32 buf[2];
1104 u32 len;
1105
1106 perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
1107 if (!perdatum)
1108 return -ENOMEM;
1109
1110 rc = next_entry(buf, fp, sizeof buf);
1111 if (rc)
1112 goto bad;
1113
1114 len = le32_to_cpu(buf[0]);
1115 perdatum->value = le32_to_cpu(buf[1]);
1116
1117 rc = str_read(&key, GFP_KERNEL, fp, len);
1118 if (rc)
1119 goto bad;
1120
1121 rc = symtab_insert(s, key, perdatum);
1122 if (rc)
1123 goto bad;
1124
1125 return 0;
1126bad:
1127 perm_destroy(key, perdatum, NULL);
1128 return rc;
1129}
1130
1131static int common_read(struct policydb *p, struct symtab *s, void *fp)
1132{
1133 char *key = NULL;
1134 struct common_datum *comdatum;
1135 __le32 buf[4];
1136 u32 len, nel;
1137 int i, rc;
1138
1139 comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
1140 if (!comdatum)
1141 return -ENOMEM;
1142
1143 rc = next_entry(buf, fp, sizeof buf);
1144 if (rc)
1145 goto bad;
1146
1147 len = le32_to_cpu(buf[0]);
1148 comdatum->value = le32_to_cpu(buf[1]);
1149 nel = le32_to_cpu(buf[3]);
1150
1151 rc = symtab_init(&comdatum->permissions, nel);
1152 if (rc)
1153 goto bad;
1154 comdatum->permissions.nprim = le32_to_cpu(buf[2]);
1155
1156 rc = str_read(&key, GFP_KERNEL, fp, len);
1157 if (rc)
1158 goto bad;
1159
1160 for (i = 0; i < nel; i++) {
1161 rc = perm_read(p, &comdatum->permissions, fp);
1162 if (rc)
1163 goto bad;
1164 }
1165
1166 rc = symtab_insert(s, key, comdatum);
1167 if (rc)
1168 goto bad;
1169 return 0;
1170bad:
1171 common_destroy(key, comdatum, NULL);
1172 return rc;
1173}
1174
1175static void type_set_init(struct type_set *t)
1176{
1177 ebitmap_init(&t->types);
1178 ebitmap_init(&t->negset);
1179}
1180
1181static int type_set_read(struct type_set *t, void *fp)
1182{
1183 __le32 buf[1];
1184 int rc;
1185
1186 if (ebitmap_read(&t->types, fp))
1187 return -EINVAL;
1188 if (ebitmap_read(&t->negset, fp))
1189 return -EINVAL;
1190
1191 rc = next_entry(buf, fp, sizeof(u32));
1192 if (rc < 0)
1193 return -EINVAL;
1194 t->flags = le32_to_cpu(buf[0]);
1195
1196 return 0;
1197}
1198
1199
1200static int read_cons_helper(struct policydb *p,
1201 struct constraint_node **nodep,
1202 int ncons, int allowxtarget, void *fp)
1203{
1204 struct constraint_node *c, *lc;
1205 struct constraint_expr *e, *le;
1206 __le32 buf[3];
1207 u32 nexpr;
1208 int rc, i, j, depth;
1209
1210 lc = NULL;
1211 for (i = 0; i < ncons; i++) {
1212 c = kzalloc(sizeof(*c), GFP_KERNEL);
1213 if (!c)
1214 return -ENOMEM;
1215
1216 if (lc)
1217 lc->next = c;
1218 else
1219 *nodep = c;
1220
1221 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1222 if (rc)
1223 return rc;
1224 c->permissions = le32_to_cpu(buf[0]);
1225 nexpr = le32_to_cpu(buf[1]);
1226 le = NULL;
1227 depth = -1;
1228 for (j = 0; j < nexpr; j++) {
1229 e = kzalloc(sizeof(*e), GFP_KERNEL);
1230 if (!e)
1231 return -ENOMEM;
1232
1233 if (le)
1234 le->next = e;
1235 else
1236 c->expr = e;
1237
1238 rc = next_entry(buf, fp, (sizeof(u32) * 3));
1239 if (rc)
1240 return rc;
1241 e->expr_type = le32_to_cpu(buf[0]);
1242 e->attr = le32_to_cpu(buf[1]);
1243 e->op = le32_to_cpu(buf[2]);
1244
1245 switch (e->expr_type) {
1246 case CEXPR_NOT:
1247 if (depth < 0)
1248 return -EINVAL;
1249 break;
1250 case CEXPR_AND:
1251 case CEXPR_OR:
1252 if (depth < 1)
1253 return -EINVAL;
1254 depth--;
1255 break;
1256 case CEXPR_ATTR:
1257 if (depth == (CEXPR_MAXDEPTH - 1))
1258 return -EINVAL;
1259 depth++;
1260 break;
1261 case CEXPR_NAMES:
1262 if (!allowxtarget && (e->attr & CEXPR_XTARGET))
1263 return -EINVAL;
1264 if (depth == (CEXPR_MAXDEPTH - 1))
1265 return -EINVAL;
1266 depth++;
1267 rc = ebitmap_read(&e->names, fp);
1268 if (rc)
1269 return rc;
1270 if (p->policyvers >=
1271 POLICYDB_VERSION_CONSTRAINT_NAMES) {
1272 e->type_names = kzalloc(sizeof
1273 (*e->type_names), GFP_KERNEL);
1274 if (!e->type_names)
1275 return -ENOMEM;
1276 type_set_init(e->type_names);
1277 rc = type_set_read(e->type_names, fp);
1278 if (rc)
1279 return rc;
1280 }
1281 break;
1282 default:
1283 return -EINVAL;
1284 }
1285 le = e;
1286 }
1287 if (depth != 0)
1288 return -EINVAL;
1289 lc = c;
1290 }
1291
1292 return 0;
1293}
1294
1295static int class_read(struct policydb *p, struct symtab *s, void *fp)
1296{
1297 char *key = NULL;
1298 struct class_datum *cladatum;
1299 __le32 buf[6];
1300 u32 len, len2, ncons, nel;
1301 int i, rc;
1302
1303 cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
1304 if (!cladatum)
1305 return -ENOMEM;
1306
1307 rc = next_entry(buf, fp, sizeof(u32)*6);
1308 if (rc)
1309 goto bad;
1310
1311 len = le32_to_cpu(buf[0]);
1312 len2 = le32_to_cpu(buf[1]);
1313 cladatum->value = le32_to_cpu(buf[2]);
1314 nel = le32_to_cpu(buf[4]);
1315
1316 rc = symtab_init(&cladatum->permissions, nel);
1317 if (rc)
1318 goto bad;
1319 cladatum->permissions.nprim = le32_to_cpu(buf[3]);
1320
1321 ncons = le32_to_cpu(buf[5]);
1322
1323 rc = str_read(&key, GFP_KERNEL, fp, len);
1324 if (rc)
1325 goto bad;
1326
1327 if (len2) {
1328 rc = str_read(&cladatum->comkey, GFP_KERNEL, fp, len2);
1329 if (rc)
1330 goto bad;
1331
1332 rc = -EINVAL;
1333 cladatum->comdatum = symtab_search(&p->p_commons,
1334 cladatum->comkey);
1335 if (!cladatum->comdatum) {
1336 pr_err("SELinux: unknown common %s\n",
1337 cladatum->comkey);
1338 goto bad;
1339 }
1340 }
1341 for (i = 0; i < nel; i++) {
1342 rc = perm_read(p, &cladatum->permissions, fp);
1343 if (rc)
1344 goto bad;
1345 }
1346
1347 rc = read_cons_helper(p, &cladatum->constraints, ncons, 0, fp);
1348 if (rc)
1349 goto bad;
1350
1351 if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
1352 /* grab the validatetrans rules */
1353 rc = next_entry(buf, fp, sizeof(u32));
1354 if (rc)
1355 goto bad;
1356 ncons = le32_to_cpu(buf[0]);
1357 rc = read_cons_helper(p, &cladatum->validatetrans,
1358 ncons, 1, fp);
1359 if (rc)
1360 goto bad;
1361 }
1362
1363 if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
1364 rc = next_entry(buf, fp, sizeof(u32) * 3);
1365 if (rc)
1366 goto bad;
1367
1368 cladatum->default_user = le32_to_cpu(buf[0]);
1369 cladatum->default_role = le32_to_cpu(buf[1]);
1370 cladatum->default_range = le32_to_cpu(buf[2]);
1371 }
1372
1373 if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
1374 rc = next_entry(buf, fp, sizeof(u32) * 1);
1375 if (rc)
1376 goto bad;
1377 cladatum->default_type = le32_to_cpu(buf[0]);
1378 }
1379
1380 rc = symtab_insert(s, key, cladatum);
1381 if (rc)
1382 goto bad;
1383
1384 return 0;
1385bad:
1386 cls_destroy(key, cladatum, NULL);
1387 return rc;
1388}
1389
1390static int role_read(struct policydb *p, struct symtab *s, void *fp)
1391{
1392 char *key = NULL;
1393 struct role_datum *role;
1394 int rc, to_read = 2;
1395 __le32 buf[3];
1396 u32 len;
1397
1398 role = kzalloc(sizeof(*role), GFP_KERNEL);
1399 if (!role)
1400 return -ENOMEM;
1401
1402 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1403 to_read = 3;
1404
1405 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1406 if (rc)
1407 goto bad;
1408
1409 len = le32_to_cpu(buf[0]);
1410 role->value = le32_to_cpu(buf[1]);
1411 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1412 role->bounds = le32_to_cpu(buf[2]);
1413
1414 rc = str_read(&key, GFP_KERNEL, fp, len);
1415 if (rc)
1416 goto bad;
1417
1418 rc = ebitmap_read(&role->dominates, fp);
1419 if (rc)
1420 goto bad;
1421
1422 rc = ebitmap_read(&role->types, fp);
1423 if (rc)
1424 goto bad;
1425
1426 if (strcmp(key, OBJECT_R) == 0) {
1427 rc = -EINVAL;
1428 if (role->value != OBJECT_R_VAL) {
1429 pr_err("SELinux: Role %s has wrong value %d\n",
1430 OBJECT_R, role->value);
1431 goto bad;
1432 }
1433 rc = 0;
1434 goto bad;
1435 }
1436
1437 rc = symtab_insert(s, key, role);
1438 if (rc)
1439 goto bad;
1440 return 0;
1441bad:
1442 role_destroy(key, role, NULL);
1443 return rc;
1444}
1445
1446static int type_read(struct policydb *p, struct symtab *s, void *fp)
1447{
1448 char *key = NULL;
1449 struct type_datum *typdatum;
1450 int rc, to_read = 3;
1451 __le32 buf[4];
1452 u32 len;
1453
1454 typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL);
1455 if (!typdatum)
1456 return -ENOMEM;
1457
1458 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1459 to_read = 4;
1460
1461 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1462 if (rc)
1463 goto bad;
1464
1465 len = le32_to_cpu(buf[0]);
1466 typdatum->value = le32_to_cpu(buf[1]);
1467 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
1468 u32 prop = le32_to_cpu(buf[2]);
1469
1470 if (prop & TYPEDATUM_PROPERTY_PRIMARY)
1471 typdatum->primary = 1;
1472 if (prop & TYPEDATUM_PROPERTY_ATTRIBUTE)
1473 typdatum->attribute = 1;
1474
1475 typdatum->bounds = le32_to_cpu(buf[3]);
1476 } else {
1477 typdatum->primary = le32_to_cpu(buf[2]);
1478 }
1479
1480 rc = str_read(&key, GFP_KERNEL, fp, len);
1481 if (rc)
1482 goto bad;
1483
1484 rc = symtab_insert(s, key, typdatum);
1485 if (rc)
1486 goto bad;
1487 return 0;
1488bad:
1489 type_destroy(key, typdatum, NULL);
1490 return rc;
1491}
1492
1493
1494/*
1495 * Read a MLS level structure from a policydb binary
1496 * representation file.
1497 */
1498static int mls_read_level(struct mls_level *lp, void *fp)
1499{
1500 __le32 buf[1];
1501 int rc;
1502
1503 memset(lp, 0, sizeof(*lp));
1504
1505 rc = next_entry(buf, fp, sizeof buf);
1506 if (rc) {
1507 pr_err("SELinux: mls: truncated level\n");
1508 return rc;
1509 }
1510 lp->sens = le32_to_cpu(buf[0]);
1511
1512 rc = ebitmap_read(&lp->cat, fp);
1513 if (rc) {
1514 pr_err("SELinux: mls: error reading level categories\n");
1515 return rc;
1516 }
1517 return 0;
1518}
1519
1520static int user_read(struct policydb *p, struct symtab *s, void *fp)
1521{
1522 char *key = NULL;
1523 struct user_datum *usrdatum;
1524 int rc, to_read = 2;
1525 __le32 buf[3];
1526 u32 len;
1527
1528 usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
1529 if (!usrdatum)
1530 return -ENOMEM;
1531
1532 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1533 to_read = 3;
1534
1535 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1536 if (rc)
1537 goto bad;
1538
1539 len = le32_to_cpu(buf[0]);
1540 usrdatum->value = le32_to_cpu(buf[1]);
1541 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1542 usrdatum->bounds = le32_to_cpu(buf[2]);
1543
1544 rc = str_read(&key, GFP_KERNEL, fp, len);
1545 if (rc)
1546 goto bad;
1547
1548 rc = ebitmap_read(&usrdatum->roles, fp);
1549 if (rc)
1550 goto bad;
1551
1552 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1553 rc = mls_read_range_helper(&usrdatum->range, fp);
1554 if (rc)
1555 goto bad;
1556 rc = mls_read_level(&usrdatum->dfltlevel, fp);
1557 if (rc)
1558 goto bad;
1559 }
1560
1561 rc = symtab_insert(s, key, usrdatum);
1562 if (rc)
1563 goto bad;
1564 return 0;
1565bad:
1566 user_destroy(key, usrdatum, NULL);
1567 return rc;
1568}
1569
1570static int sens_read(struct policydb *p, struct symtab *s, void *fp)
1571{
1572 char *key = NULL;
1573 struct level_datum *levdatum;
1574 int rc;
1575 __le32 buf[2];
1576 u32 len;
1577
1578 levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC);
1579 if (!levdatum)
1580 return -ENOMEM;
1581
1582 rc = next_entry(buf, fp, sizeof buf);
1583 if (rc)
1584 goto bad;
1585
1586 len = le32_to_cpu(buf[0]);
1587 levdatum->isalias = le32_to_cpu(buf[1]);
1588
1589 rc = str_read(&key, GFP_ATOMIC, fp, len);
1590 if (rc)
1591 goto bad;
1592
1593 rc = -ENOMEM;
1594 levdatum->level = kmalloc(sizeof(*levdatum->level), GFP_ATOMIC);
1595 if (!levdatum->level)
1596 goto bad;
1597
1598 rc = mls_read_level(levdatum->level, fp);
1599 if (rc)
1600 goto bad;
1601
1602 rc = symtab_insert(s, key, levdatum);
1603 if (rc)
1604 goto bad;
1605 return 0;
1606bad:
1607 sens_destroy(key, levdatum, NULL);
1608 return rc;
1609}
1610
1611static int cat_read(struct policydb *p, struct symtab *s, void *fp)
1612{
1613 char *key = NULL;
1614 struct cat_datum *catdatum;
1615 int rc;
1616 __le32 buf[3];
1617 u32 len;
1618
1619 catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC);
1620 if (!catdatum)
1621 return -ENOMEM;
1622
1623 rc = next_entry(buf, fp, sizeof buf);
1624 if (rc)
1625 goto bad;
1626
1627 len = le32_to_cpu(buf[0]);
1628 catdatum->value = le32_to_cpu(buf[1]);
1629 catdatum->isalias = le32_to_cpu(buf[2]);
1630
1631 rc = str_read(&key, GFP_ATOMIC, fp, len);
1632 if (rc)
1633 goto bad;
1634
1635 rc = symtab_insert(s, key, catdatum);
1636 if (rc)
1637 goto bad;
1638 return 0;
1639bad:
1640 cat_destroy(key, catdatum, NULL);
1641 return rc;
1642}
1643
1644static int (*read_f[SYM_NUM]) (struct policydb *p, struct symtab *s, void *fp) =
1645{
1646 common_read,
1647 class_read,
1648 role_read,
1649 type_read,
1650 user_read,
1651 cond_read_bool,
1652 sens_read,
1653 cat_read,
1654};
1655
1656static int user_bounds_sanity_check(void *key, void *datum, void *datap)
1657{
1658 struct user_datum *upper, *user;
1659 struct policydb *p = datap;
1660 int depth = 0;
1661
1662 upper = user = datum;
1663 while (upper->bounds) {
1664 struct ebitmap_node *node;
1665 unsigned long bit;
1666
1667 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1668 pr_err("SELinux: user %s: "
1669 "too deep or looped boundary",
1670 (char *) key);
1671 return -EINVAL;
1672 }
1673
1674 upper = p->user_val_to_struct[upper->bounds - 1];
1675 ebitmap_for_each_positive_bit(&user->roles, node, bit) {
1676 if (ebitmap_get_bit(&upper->roles, bit))
1677 continue;
1678
1679 pr_err("SELinux: boundary violated policy: "
1680 "user=%s role=%s bounds=%s\n",
1681 sym_name(p, SYM_USERS, user->value - 1),
1682 sym_name(p, SYM_ROLES, bit),
1683 sym_name(p, SYM_USERS, upper->value - 1));
1684
1685 return -EINVAL;
1686 }
1687 }
1688
1689 return 0;
1690}
1691
1692static int role_bounds_sanity_check(void *key, void *datum, void *datap)
1693{
1694 struct role_datum *upper, *role;
1695 struct policydb *p = datap;
1696 int depth = 0;
1697
1698 upper = role = datum;
1699 while (upper->bounds) {
1700 struct ebitmap_node *node;
1701 unsigned long bit;
1702
1703 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1704 pr_err("SELinux: role %s: "
1705 "too deep or looped bounds\n",
1706 (char *) key);
1707 return -EINVAL;
1708 }
1709
1710 upper = p->role_val_to_struct[upper->bounds - 1];
1711 ebitmap_for_each_positive_bit(&role->types, node, bit) {
1712 if (ebitmap_get_bit(&upper->types, bit))
1713 continue;
1714
1715 pr_err("SELinux: boundary violated policy: "
1716 "role=%s type=%s bounds=%s\n",
1717 sym_name(p, SYM_ROLES, role->value - 1),
1718 sym_name(p, SYM_TYPES, bit),
1719 sym_name(p, SYM_ROLES, upper->value - 1));
1720
1721 return -EINVAL;
1722 }
1723 }
1724
1725 return 0;
1726}
1727
1728static int type_bounds_sanity_check(void *key, void *datum, void *datap)
1729{
1730 struct type_datum *upper;
1731 struct policydb *p = datap;
1732 int depth = 0;
1733
1734 upper = datum;
1735 while (upper->bounds) {
1736 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1737 pr_err("SELinux: type %s: "
1738 "too deep or looped boundary\n",
1739 (char *) key);
1740 return -EINVAL;
1741 }
1742
1743 upper = p->type_val_to_struct[upper->bounds - 1];
1744 BUG_ON(!upper);
1745
1746 if (upper->attribute) {
1747 pr_err("SELinux: type %s: "
1748 "bounded by attribute %s",
1749 (char *) key,
1750 sym_name(p, SYM_TYPES, upper->value - 1));
1751 return -EINVAL;
1752 }
1753 }
1754
1755 return 0;
1756}
1757
1758static int policydb_bounds_sanity_check(struct policydb *p)
1759{
1760 int rc;
1761
1762 if (p->policyvers < POLICYDB_VERSION_BOUNDARY)
1763 return 0;
1764
1765 rc = hashtab_map(&p->p_users.table, user_bounds_sanity_check, p);
1766 if (rc)
1767 return rc;
1768
1769 rc = hashtab_map(&p->p_roles.table, role_bounds_sanity_check, p);
1770 if (rc)
1771 return rc;
1772
1773 rc = hashtab_map(&p->p_types.table, type_bounds_sanity_check, p);
1774 if (rc)
1775 return rc;
1776
1777 return 0;
1778}
1779
1780u16 string_to_security_class(struct policydb *p, const char *name)
1781{
1782 struct class_datum *cladatum;
1783
1784 cladatum = symtab_search(&p->p_classes, name);
1785 if (!cladatum)
1786 return 0;
1787
1788 return cladatum->value;
1789}
1790
1791u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name)
1792{
1793 struct class_datum *cladatum;
1794 struct perm_datum *perdatum = NULL;
1795 struct common_datum *comdatum;
1796
1797 if (!tclass || tclass > p->p_classes.nprim)
1798 return 0;
1799
1800 cladatum = p->class_val_to_struct[tclass-1];
1801 comdatum = cladatum->comdatum;
1802 if (comdatum)
1803 perdatum = symtab_search(&comdatum->permissions, name);
1804 if (!perdatum)
1805 perdatum = symtab_search(&cladatum->permissions, name);
1806 if (!perdatum)
1807 return 0;
1808
1809 return 1U << (perdatum->value-1);
1810}
1811
1812static int range_read(struct policydb *p, void *fp)
1813{
1814 struct range_trans *rt = NULL;
1815 struct mls_range *r = NULL;
1816 int i, rc;
1817 __le32 buf[2];
1818 u32 nel;
1819
1820 if (p->policyvers < POLICYDB_VERSION_MLS)
1821 return 0;
1822
1823 rc = next_entry(buf, fp, sizeof(u32));
1824 if (rc)
1825 return rc;
1826
1827 nel = le32_to_cpu(buf[0]);
1828
1829 rc = hashtab_init(&p->range_tr, nel);
1830 if (rc)
1831 return rc;
1832
1833 for (i = 0; i < nel; i++) {
1834 rc = -ENOMEM;
1835 rt = kzalloc(sizeof(*rt), GFP_KERNEL);
1836 if (!rt)
1837 goto out;
1838
1839 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1840 if (rc)
1841 goto out;
1842
1843 rt->source_type = le32_to_cpu(buf[0]);
1844 rt->target_type = le32_to_cpu(buf[1]);
1845 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
1846 rc = next_entry(buf, fp, sizeof(u32));
1847 if (rc)
1848 goto out;
1849 rt->target_class = le32_to_cpu(buf[0]);
1850 } else
1851 rt->target_class = p->process_class;
1852
1853 rc = -EINVAL;
1854 if (!policydb_type_isvalid(p, rt->source_type) ||
1855 !policydb_type_isvalid(p, rt->target_type) ||
1856 !policydb_class_isvalid(p, rt->target_class))
1857 goto out;
1858
1859 rc = -ENOMEM;
1860 r = kzalloc(sizeof(*r), GFP_KERNEL);
1861 if (!r)
1862 goto out;
1863
1864 rc = mls_read_range_helper(r, fp);
1865 if (rc)
1866 goto out;
1867
1868 rc = -EINVAL;
1869 if (!mls_range_isvalid(p, r)) {
1870 pr_warn("SELinux: rangetrans: invalid range\n");
1871 goto out;
1872 }
1873
1874 rc = hashtab_insert(&p->range_tr, rt, r, rangetr_key_params);
1875 if (rc)
1876 goto out;
1877
1878 rt = NULL;
1879 r = NULL;
1880 }
1881 hash_eval(&p->range_tr, "rangetr");
1882 rc = 0;
1883out:
1884 kfree(rt);
1885 kfree(r);
1886 return rc;
1887}
1888
1889static int filename_trans_read_helper_compat(struct policydb *p, void *fp)
1890{
1891 struct filename_trans_key key, *ft = NULL;
1892 struct filename_trans_datum *last, *datum = NULL;
1893 char *name = NULL;
1894 u32 len, stype, otype;
1895 __le32 buf[4];
1896 int rc;
1897
1898 /* length of the path component string */
1899 rc = next_entry(buf, fp, sizeof(u32));
1900 if (rc)
1901 return rc;
1902 len = le32_to_cpu(buf[0]);
1903
1904 /* path component string */
1905 rc = str_read(&name, GFP_KERNEL, fp, len);
1906 if (rc)
1907 return rc;
1908
1909 rc = next_entry(buf, fp, sizeof(u32) * 4);
1910 if (rc)
1911 goto out;
1912
1913 stype = le32_to_cpu(buf[0]);
1914 key.ttype = le32_to_cpu(buf[1]);
1915 key.tclass = le32_to_cpu(buf[2]);
1916 key.name = name;
1917
1918 otype = le32_to_cpu(buf[3]);
1919
1920 last = NULL;
1921 datum = policydb_filenametr_search(p, &key);
1922 while (datum) {
1923 if (unlikely(ebitmap_get_bit(&datum->stypes, stype - 1))) {
1924 /* conflicting/duplicate rules are ignored */
1925 datum = NULL;
1926 goto out;
1927 }
1928 if (likely(datum->otype == otype))
1929 break;
1930 last = datum;
1931 datum = datum->next;
1932 }
1933 if (!datum) {
1934 rc = -ENOMEM;
1935 datum = kmalloc(sizeof(*datum), GFP_KERNEL);
1936 if (!datum)
1937 goto out;
1938
1939 ebitmap_init(&datum->stypes);
1940 datum->otype = otype;
1941 datum->next = NULL;
1942
1943 if (unlikely(last)) {
1944 last->next = datum;
1945 } else {
1946 rc = -ENOMEM;
1947 ft = kmemdup(&key, sizeof(key), GFP_KERNEL);
1948 if (!ft)
1949 goto out;
1950
1951 rc = hashtab_insert(&p->filename_trans, ft, datum,
1952 filenametr_key_params);
1953 if (rc)
1954 goto out;
1955 name = NULL;
1956
1957 rc = ebitmap_set_bit(&p->filename_trans_ttypes,
1958 key.ttype, 1);
1959 if (rc)
1960 return rc;
1961 }
1962 }
1963 kfree(name);
1964 return ebitmap_set_bit(&datum->stypes, stype - 1, 1);
1965
1966out:
1967 kfree(ft);
1968 kfree(name);
1969 kfree(datum);
1970 return rc;
1971}
1972
1973static int filename_trans_read_helper(struct policydb *p, void *fp)
1974{
1975 struct filename_trans_key *ft = NULL;
1976 struct filename_trans_datum **dst, *datum, *first = NULL;
1977 char *name = NULL;
1978 u32 len, ttype, tclass, ndatum, i;
1979 __le32 buf[3];
1980 int rc;
1981
1982 /* length of the path component string */
1983 rc = next_entry(buf, fp, sizeof(u32));
1984 if (rc)
1985 return rc;
1986 len = le32_to_cpu(buf[0]);
1987
1988 /* path component string */
1989 rc = str_read(&name, GFP_KERNEL, fp, len);
1990 if (rc)
1991 return rc;
1992
1993 rc = next_entry(buf, fp, sizeof(u32) * 3);
1994 if (rc)
1995 goto out;
1996
1997 ttype = le32_to_cpu(buf[0]);
1998 tclass = le32_to_cpu(buf[1]);
1999
2000 ndatum = le32_to_cpu(buf[2]);
2001 if (ndatum == 0) {
2002 pr_err("SELinux: Filename transition key with no datum\n");
2003 rc = -ENOENT;
2004 goto out;
2005 }
2006
2007 dst = &first;
2008 for (i = 0; i < ndatum; i++) {
2009 rc = -ENOMEM;
2010 datum = kmalloc(sizeof(*datum), GFP_KERNEL);
2011 if (!datum)
2012 goto out;
2013
2014 *dst = datum;
2015
2016 /* ebitmap_read() will at least init the bitmap */
2017 rc = ebitmap_read(&datum->stypes, fp);
2018 if (rc)
2019 goto out;
2020
2021 rc = next_entry(buf, fp, sizeof(u32));
2022 if (rc)
2023 goto out;
2024
2025 datum->otype = le32_to_cpu(buf[0]);
2026 datum->next = NULL;
2027
2028 dst = &datum->next;
2029 }
2030
2031 rc = -ENOMEM;
2032 ft = kmalloc(sizeof(*ft), GFP_KERNEL);
2033 if (!ft)
2034 goto out;
2035
2036 ft->ttype = ttype;
2037 ft->tclass = tclass;
2038 ft->name = name;
2039
2040 rc = hashtab_insert(&p->filename_trans, ft, first,
2041 filenametr_key_params);
2042 if (rc == -EEXIST)
2043 pr_err("SELinux: Duplicate filename transition key\n");
2044 if (rc)
2045 goto out;
2046
2047 return ebitmap_set_bit(&p->filename_trans_ttypes, ttype, 1);
2048
2049out:
2050 kfree(ft);
2051 kfree(name);
2052 while (first) {
2053 datum = first;
2054 first = first->next;
2055
2056 ebitmap_destroy(&datum->stypes);
2057 kfree(datum);
2058 }
2059 return rc;
2060}
2061
2062static int filename_trans_read(struct policydb *p, void *fp)
2063{
2064 u32 nel;
2065 __le32 buf[1];
2066 int rc, i;
2067
2068 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
2069 return 0;
2070
2071 rc = next_entry(buf, fp, sizeof(u32));
2072 if (rc)
2073 return rc;
2074 nel = le32_to_cpu(buf[0]);
2075
2076 if (p->policyvers < POLICYDB_VERSION_COMP_FTRANS) {
2077 p->compat_filename_trans_count = nel;
2078
2079 rc = hashtab_init(&p->filename_trans, (1 << 11));
2080 if (rc)
2081 return rc;
2082
2083 for (i = 0; i < nel; i++) {
2084 rc = filename_trans_read_helper_compat(p, fp);
2085 if (rc)
2086 return rc;
2087 }
2088 } else {
2089 rc = hashtab_init(&p->filename_trans, nel);
2090 if (rc)
2091 return rc;
2092
2093 for (i = 0; i < nel; i++) {
2094 rc = filename_trans_read_helper(p, fp);
2095 if (rc)
2096 return rc;
2097 }
2098 }
2099 hash_eval(&p->filename_trans, "filenametr");
2100 return 0;
2101}
2102
2103static int genfs_read(struct policydb *p, void *fp)
2104{
2105 int i, j, rc;
2106 u32 nel, nel2, len, len2;
2107 __le32 buf[1];
2108 struct ocontext *l, *c;
2109 struct ocontext *newc = NULL;
2110 struct genfs *genfs_p, *genfs;
2111 struct genfs *newgenfs = NULL;
2112
2113 rc = next_entry(buf, fp, sizeof(u32));
2114 if (rc)
2115 return rc;
2116 nel = le32_to_cpu(buf[0]);
2117
2118 for (i = 0; i < nel; i++) {
2119 rc = next_entry(buf, fp, sizeof(u32));
2120 if (rc)
2121 goto out;
2122 len = le32_to_cpu(buf[0]);
2123
2124 rc = -ENOMEM;
2125 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
2126 if (!newgenfs)
2127 goto out;
2128
2129 rc = str_read(&newgenfs->fstype, GFP_KERNEL, fp, len);
2130 if (rc)
2131 goto out;
2132
2133 for (genfs_p = NULL, genfs = p->genfs; genfs;
2134 genfs_p = genfs, genfs = genfs->next) {
2135 rc = -EINVAL;
2136 if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
2137 pr_err("SELinux: dup genfs fstype %s\n",
2138 newgenfs->fstype);
2139 goto out;
2140 }
2141 if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
2142 break;
2143 }
2144 newgenfs->next = genfs;
2145 if (genfs_p)
2146 genfs_p->next = newgenfs;
2147 else
2148 p->genfs = newgenfs;
2149 genfs = newgenfs;
2150 newgenfs = NULL;
2151
2152 rc = next_entry(buf, fp, sizeof(u32));
2153 if (rc)
2154 goto out;
2155
2156 nel2 = le32_to_cpu(buf[0]);
2157 for (j = 0; j < nel2; j++) {
2158 rc = next_entry(buf, fp, sizeof(u32));
2159 if (rc)
2160 goto out;
2161 len = le32_to_cpu(buf[0]);
2162
2163 rc = -ENOMEM;
2164 newc = kzalloc(sizeof(*newc), GFP_KERNEL);
2165 if (!newc)
2166 goto out;
2167
2168 rc = str_read(&newc->u.name, GFP_KERNEL, fp, len);
2169 if (rc)
2170 goto out;
2171
2172 rc = next_entry(buf, fp, sizeof(u32));
2173 if (rc)
2174 goto out;
2175
2176 newc->v.sclass = le32_to_cpu(buf[0]);
2177 rc = context_read_and_validate(&newc->context[0], p, fp);
2178 if (rc)
2179 goto out;
2180
2181 for (l = NULL, c = genfs->head; c;
2182 l = c, c = c->next) {
2183 rc = -EINVAL;
2184 if (!strcmp(newc->u.name, c->u.name) &&
2185 (!c->v.sclass || !newc->v.sclass ||
2186 newc->v.sclass == c->v.sclass)) {
2187 pr_err("SELinux: dup genfs entry (%s,%s)\n",
2188 genfs->fstype, c->u.name);
2189 goto out;
2190 }
2191 len = strlen(newc->u.name);
2192 len2 = strlen(c->u.name);
2193 if (len > len2)
2194 break;
2195 }
2196
2197 newc->next = c;
2198 if (l)
2199 l->next = newc;
2200 else
2201 genfs->head = newc;
2202 newc = NULL;
2203 }
2204 }
2205 rc = 0;
2206out:
2207 if (newgenfs) {
2208 kfree(newgenfs->fstype);
2209 kfree(newgenfs);
2210 }
2211 ocontext_destroy(newc, OCON_FSUSE);
2212
2213 return rc;
2214}
2215
2216static int ocontext_read(struct policydb *p, struct policydb_compat_info *info,
2217 void *fp)
2218{
2219 int i, j, rc;
2220 u32 nel, len;
2221 __be64 prefixbuf[1];
2222 __le32 buf[3];
2223 struct ocontext *l, *c;
2224 u32 nodebuf[8];
2225
2226 for (i = 0; i < info->ocon_num; i++) {
2227 rc = next_entry(buf, fp, sizeof(u32));
2228 if (rc)
2229 goto out;
2230 nel = le32_to_cpu(buf[0]);
2231
2232 l = NULL;
2233 for (j = 0; j < nel; j++) {
2234 rc = -ENOMEM;
2235 c = kzalloc(sizeof(*c), GFP_KERNEL);
2236 if (!c)
2237 goto out;
2238 if (l)
2239 l->next = c;
2240 else
2241 p->ocontexts[i] = c;
2242 l = c;
2243
2244 switch (i) {
2245 case OCON_ISID:
2246 rc = next_entry(buf, fp, sizeof(u32));
2247 if (rc)
2248 goto out;
2249
2250 c->sid[0] = le32_to_cpu(buf[0]);
2251 rc = context_read_and_validate(&c->context[0], p, fp);
2252 if (rc)
2253 goto out;
2254 break;
2255 case OCON_FS:
2256 case OCON_NETIF:
2257 rc = next_entry(buf, fp, sizeof(u32));
2258 if (rc)
2259 goto out;
2260 len = le32_to_cpu(buf[0]);
2261
2262 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2263 if (rc)
2264 goto out;
2265
2266 rc = context_read_and_validate(&c->context[0], p, fp);
2267 if (rc)
2268 goto out;
2269 rc = context_read_and_validate(&c->context[1], p, fp);
2270 if (rc)
2271 goto out;
2272 break;
2273 case OCON_PORT:
2274 rc = next_entry(buf, fp, sizeof(u32)*3);
2275 if (rc)
2276 goto out;
2277 c->u.port.protocol = le32_to_cpu(buf[0]);
2278 c->u.port.low_port = le32_to_cpu(buf[1]);
2279 c->u.port.high_port = le32_to_cpu(buf[2]);
2280 rc = context_read_and_validate(&c->context[0], p, fp);
2281 if (rc)
2282 goto out;
2283 break;
2284 case OCON_NODE:
2285 rc = next_entry(nodebuf, fp, sizeof(u32) * 2);
2286 if (rc)
2287 goto out;
2288 c->u.node.addr = nodebuf[0]; /* network order */
2289 c->u.node.mask = nodebuf[1]; /* network order */
2290 rc = context_read_and_validate(&c->context[0], p, fp);
2291 if (rc)
2292 goto out;
2293 break;
2294 case OCON_FSUSE:
2295 rc = next_entry(buf, fp, sizeof(u32)*2);
2296 if (rc)
2297 goto out;
2298
2299 rc = -EINVAL;
2300 c->v.behavior = le32_to_cpu(buf[0]);
2301 /* Determined at runtime, not in policy DB. */
2302 if (c->v.behavior == SECURITY_FS_USE_MNTPOINT)
2303 goto out;
2304 if (c->v.behavior > SECURITY_FS_USE_MAX)
2305 goto out;
2306
2307 len = le32_to_cpu(buf[1]);
2308 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2309 if (rc)
2310 goto out;
2311
2312 rc = context_read_and_validate(&c->context[0], p, fp);
2313 if (rc)
2314 goto out;
2315 break;
2316 case OCON_NODE6: {
2317 int k;
2318
2319 rc = next_entry(nodebuf, fp, sizeof(u32) * 8);
2320 if (rc)
2321 goto out;
2322 for (k = 0; k < 4; k++)
2323 c->u.node6.addr[k] = nodebuf[k];
2324 for (k = 0; k < 4; k++)
2325 c->u.node6.mask[k] = nodebuf[k+4];
2326 rc = context_read_and_validate(&c->context[0], p, fp);
2327 if (rc)
2328 goto out;
2329 break;
2330 }
2331 case OCON_IBPKEY: {
2332 u32 pkey_lo, pkey_hi;
2333
2334 rc = next_entry(prefixbuf, fp, sizeof(u64));
2335 if (rc)
2336 goto out;
2337
2338 /* we need to have subnet_prefix in CPU order */
2339 c->u.ibpkey.subnet_prefix = be64_to_cpu(prefixbuf[0]);
2340
2341 rc = next_entry(buf, fp, sizeof(u32) * 2);
2342 if (rc)
2343 goto out;
2344
2345 pkey_lo = le32_to_cpu(buf[0]);
2346 pkey_hi = le32_to_cpu(buf[1]);
2347
2348 if (pkey_lo > U16_MAX || pkey_hi > U16_MAX) {
2349 rc = -EINVAL;
2350 goto out;
2351 }
2352
2353 c->u.ibpkey.low_pkey = pkey_lo;
2354 c->u.ibpkey.high_pkey = pkey_hi;
2355
2356 rc = context_read_and_validate(&c->context[0],
2357 p,
2358 fp);
2359 if (rc)
2360 goto out;
2361 break;
2362 }
2363 case OCON_IBENDPORT: {
2364 u32 port;
2365
2366 rc = next_entry(buf, fp, sizeof(u32) * 2);
2367 if (rc)
2368 goto out;
2369 len = le32_to_cpu(buf[0]);
2370
2371 rc = str_read(&c->u.ibendport.dev_name, GFP_KERNEL, fp, len);
2372 if (rc)
2373 goto out;
2374
2375 port = le32_to_cpu(buf[1]);
2376 if (port > U8_MAX || port == 0) {
2377 rc = -EINVAL;
2378 goto out;
2379 }
2380
2381 c->u.ibendport.port = port;
2382
2383 rc = context_read_and_validate(&c->context[0],
2384 p,
2385 fp);
2386 if (rc)
2387 goto out;
2388 break;
2389 } /* end case */
2390 } /* end switch */
2391 }
2392 }
2393 rc = 0;
2394out:
2395 return rc;
2396}
2397
2398/*
2399 * Read the configuration data from a policy database binary
2400 * representation file into a policy database structure.
2401 */
2402int policydb_read(struct policydb *p, void *fp)
2403{
2404 struct role_allow *ra, *lra;
2405 struct role_trans_key *rtk = NULL;
2406 struct role_trans_datum *rtd = NULL;
2407 int i, j, rc;
2408 __le32 buf[4];
2409 u32 len, nprim, nel, perm;
2410
2411 char *policydb_str;
2412 struct policydb_compat_info *info;
2413
2414 policydb_init(p);
2415
2416 /* Read the magic number and string length. */
2417 rc = next_entry(buf, fp, sizeof(u32) * 2);
2418 if (rc)
2419 goto bad;
2420
2421 rc = -EINVAL;
2422 if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
2423 pr_err("SELinux: policydb magic number 0x%x does "
2424 "not match expected magic number 0x%x\n",
2425 le32_to_cpu(buf[0]), POLICYDB_MAGIC);
2426 goto bad;
2427 }
2428
2429 rc = -EINVAL;
2430 len = le32_to_cpu(buf[1]);
2431 if (len != strlen(POLICYDB_STRING)) {
2432 pr_err("SELinux: policydb string length %d does not "
2433 "match expected length %zu\n",
2434 len, strlen(POLICYDB_STRING));
2435 goto bad;
2436 }
2437
2438 rc = -ENOMEM;
2439 policydb_str = kmalloc(len + 1, GFP_KERNEL);
2440 if (!policydb_str) {
2441 pr_err("SELinux: unable to allocate memory for policydb "
2442 "string of length %d\n", len);
2443 goto bad;
2444 }
2445
2446 rc = next_entry(policydb_str, fp, len);
2447 if (rc) {
2448 pr_err("SELinux: truncated policydb string identifier\n");
2449 kfree(policydb_str);
2450 goto bad;
2451 }
2452
2453 rc = -EINVAL;
2454 policydb_str[len] = '\0';
2455 if (strcmp(policydb_str, POLICYDB_STRING)) {
2456 pr_err("SELinux: policydb string %s does not match "
2457 "my string %s\n", policydb_str, POLICYDB_STRING);
2458 kfree(policydb_str);
2459 goto bad;
2460 }
2461 /* Done with policydb_str. */
2462 kfree(policydb_str);
2463 policydb_str = NULL;
2464
2465 /* Read the version and table sizes. */
2466 rc = next_entry(buf, fp, sizeof(u32)*4);
2467 if (rc)
2468 goto bad;
2469
2470 rc = -EINVAL;
2471 p->policyvers = le32_to_cpu(buf[0]);
2472 if (p->policyvers < POLICYDB_VERSION_MIN ||
2473 p->policyvers > POLICYDB_VERSION_MAX) {
2474 pr_err("SELinux: policydb version %d does not match "
2475 "my version range %d-%d\n",
2476 le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
2477 goto bad;
2478 }
2479
2480 if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
2481 p->mls_enabled = 1;
2482
2483 rc = -EINVAL;
2484 if (p->policyvers < POLICYDB_VERSION_MLS) {
2485 pr_err("SELinux: security policydb version %d "
2486 "(MLS) not backwards compatible\n",
2487 p->policyvers);
2488 goto bad;
2489 }
2490 }
2491 p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
2492 p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
2493
2494 if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
2495 rc = ebitmap_read(&p->policycaps, fp);
2496 if (rc)
2497 goto bad;
2498 }
2499
2500 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
2501 rc = ebitmap_read(&p->permissive_map, fp);
2502 if (rc)
2503 goto bad;
2504 }
2505
2506 rc = -EINVAL;
2507 info = policydb_lookup_compat(p->policyvers);
2508 if (!info) {
2509 pr_err("SELinux: unable to find policy compat info "
2510 "for version %d\n", p->policyvers);
2511 goto bad;
2512 }
2513
2514 rc = -EINVAL;
2515 if (le32_to_cpu(buf[2]) != info->sym_num ||
2516 le32_to_cpu(buf[3]) != info->ocon_num) {
2517 pr_err("SELinux: policydb table sizes (%d,%d) do "
2518 "not match mine (%d,%d)\n", le32_to_cpu(buf[2]),
2519 le32_to_cpu(buf[3]),
2520 info->sym_num, info->ocon_num);
2521 goto bad;
2522 }
2523
2524 for (i = 0; i < info->sym_num; i++) {
2525 rc = next_entry(buf, fp, sizeof(u32)*2);
2526 if (rc)
2527 goto bad;
2528 nprim = le32_to_cpu(buf[0]);
2529 nel = le32_to_cpu(buf[1]);
2530
2531 rc = symtab_init(&p->symtab[i], nel);
2532 if (rc)
2533 goto out;
2534
2535 if (i == SYM_ROLES) {
2536 rc = roles_init(p);
2537 if (rc)
2538 goto out;
2539 }
2540
2541 for (j = 0; j < nel; j++) {
2542 rc = read_f[i](p, &p->symtab[i], fp);
2543 if (rc)
2544 goto bad;
2545 }
2546
2547 p->symtab[i].nprim = nprim;
2548 }
2549
2550 rc = -EINVAL;
2551 p->process_class = string_to_security_class(p, "process");
2552 if (!p->process_class) {
2553 pr_err("SELinux: process class is required, not defined in policy\n");
2554 goto bad;
2555 }
2556
2557 rc = avtab_read(&p->te_avtab, fp, p);
2558 if (rc)
2559 goto bad;
2560
2561 if (p->policyvers >= POLICYDB_VERSION_BOOL) {
2562 rc = cond_read_list(p, fp);
2563 if (rc)
2564 goto bad;
2565 }
2566
2567 rc = next_entry(buf, fp, sizeof(u32));
2568 if (rc)
2569 goto bad;
2570 nel = le32_to_cpu(buf[0]);
2571
2572 rc = hashtab_init(&p->role_tr, nel);
2573 if (rc)
2574 goto bad;
2575 for (i = 0; i < nel; i++) {
2576 rc = -ENOMEM;
2577 rtk = kmalloc(sizeof(*rtk), GFP_KERNEL);
2578 if (!rtk)
2579 goto bad;
2580
2581 rc = -ENOMEM;
2582 rtd = kmalloc(sizeof(*rtd), GFP_KERNEL);
2583 if (!rtd)
2584 goto bad;
2585
2586 rc = next_entry(buf, fp, sizeof(u32)*3);
2587 if (rc)
2588 goto bad;
2589
2590 rtk->role = le32_to_cpu(buf[0]);
2591 rtk->type = le32_to_cpu(buf[1]);
2592 rtd->new_role = le32_to_cpu(buf[2]);
2593 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2594 rc = next_entry(buf, fp, sizeof(u32));
2595 if (rc)
2596 goto bad;
2597 rtk->tclass = le32_to_cpu(buf[0]);
2598 } else
2599 rtk->tclass = p->process_class;
2600
2601 rc = -EINVAL;
2602 if (!policydb_role_isvalid(p, rtk->role) ||
2603 !policydb_type_isvalid(p, rtk->type) ||
2604 !policydb_class_isvalid(p, rtk->tclass) ||
2605 !policydb_role_isvalid(p, rtd->new_role))
2606 goto bad;
2607
2608 rc = hashtab_insert(&p->role_tr, rtk, rtd, roletr_key_params);
2609 if (rc)
2610 goto bad;
2611
2612 rtk = NULL;
2613 rtd = NULL;
2614 }
2615
2616 rc = next_entry(buf, fp, sizeof(u32));
2617 if (rc)
2618 goto bad;
2619 nel = le32_to_cpu(buf[0]);
2620 lra = NULL;
2621 for (i = 0; i < nel; i++) {
2622 rc = -ENOMEM;
2623 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
2624 if (!ra)
2625 goto bad;
2626 if (lra)
2627 lra->next = ra;
2628 else
2629 p->role_allow = ra;
2630 rc = next_entry(buf, fp, sizeof(u32)*2);
2631 if (rc)
2632 goto bad;
2633
2634 rc = -EINVAL;
2635 ra->role = le32_to_cpu(buf[0]);
2636 ra->new_role = le32_to_cpu(buf[1]);
2637 if (!policydb_role_isvalid(p, ra->role) ||
2638 !policydb_role_isvalid(p, ra->new_role))
2639 goto bad;
2640 lra = ra;
2641 }
2642
2643 rc = filename_trans_read(p, fp);
2644 if (rc)
2645 goto bad;
2646
2647 rc = policydb_index(p);
2648 if (rc)
2649 goto bad;
2650
2651 rc = -EINVAL;
2652 perm = string_to_av_perm(p, p->process_class, "transition");
2653 if (!perm) {
2654 pr_err("SELinux: process transition permission is required, not defined in policy\n");
2655 goto bad;
2656 }
2657 p->process_trans_perms = perm;
2658 perm = string_to_av_perm(p, p->process_class, "dyntransition");
2659 if (!perm) {
2660 pr_err("SELinux: process dyntransition permission is required, not defined in policy\n");
2661 goto bad;
2662 }
2663 p->process_trans_perms |= perm;
2664
2665 rc = ocontext_read(p, info, fp);
2666 if (rc)
2667 goto bad;
2668
2669 rc = genfs_read(p, fp);
2670 if (rc)
2671 goto bad;
2672
2673 rc = range_read(p, fp);
2674 if (rc)
2675 goto bad;
2676
2677 rc = -ENOMEM;
2678 p->type_attr_map_array = kvcalloc(p->p_types.nprim,
2679 sizeof(*p->type_attr_map_array),
2680 GFP_KERNEL);
2681 if (!p->type_attr_map_array)
2682 goto bad;
2683
2684 /* just in case ebitmap_init() becomes more than just a memset(0): */
2685 for (i = 0; i < p->p_types.nprim; i++)
2686 ebitmap_init(&p->type_attr_map_array[i]);
2687
2688 for (i = 0; i < p->p_types.nprim; i++) {
2689 struct ebitmap *e = &p->type_attr_map_array[i];
2690
2691 if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
2692 rc = ebitmap_read(e, fp);
2693 if (rc)
2694 goto bad;
2695 }
2696 /* add the type itself as the degenerate case */
2697 rc = ebitmap_set_bit(e, i, 1);
2698 if (rc)
2699 goto bad;
2700 }
2701
2702 rc = policydb_bounds_sanity_check(p);
2703 if (rc)
2704 goto bad;
2705
2706 rc = 0;
2707out:
2708 return rc;
2709bad:
2710 kfree(rtk);
2711 kfree(rtd);
2712 policydb_destroy(p);
2713 goto out;
2714}
2715
2716/*
2717 * Write a MLS level structure to a policydb binary
2718 * representation file.
2719 */
2720static int mls_write_level(struct mls_level *l, void *fp)
2721{
2722 __le32 buf[1];
2723 int rc;
2724
2725 buf[0] = cpu_to_le32(l->sens);
2726 rc = put_entry(buf, sizeof(u32), 1, fp);
2727 if (rc)
2728 return rc;
2729
2730 rc = ebitmap_write(&l->cat, fp);
2731 if (rc)
2732 return rc;
2733
2734 return 0;
2735}
2736
2737/*
2738 * Write a MLS range structure to a policydb binary
2739 * representation file.
2740 */
2741static int mls_write_range_helper(struct mls_range *r, void *fp)
2742{
2743 __le32 buf[3];
2744 size_t items;
2745 int rc, eq;
2746
2747 eq = mls_level_eq(&r->level[1], &r->level[0]);
2748
2749 if (eq)
2750 items = 2;
2751 else
2752 items = 3;
2753 buf[0] = cpu_to_le32(items-1);
2754 buf[1] = cpu_to_le32(r->level[0].sens);
2755 if (!eq)
2756 buf[2] = cpu_to_le32(r->level[1].sens);
2757
2758 BUG_ON(items > ARRAY_SIZE(buf));
2759
2760 rc = put_entry(buf, sizeof(u32), items, fp);
2761 if (rc)
2762 return rc;
2763
2764 rc = ebitmap_write(&r->level[0].cat, fp);
2765 if (rc)
2766 return rc;
2767 if (!eq) {
2768 rc = ebitmap_write(&r->level[1].cat, fp);
2769 if (rc)
2770 return rc;
2771 }
2772
2773 return 0;
2774}
2775
2776static int sens_write(void *vkey, void *datum, void *ptr)
2777{
2778 char *key = vkey;
2779 struct level_datum *levdatum = datum;
2780 struct policy_data *pd = ptr;
2781 void *fp = pd->fp;
2782 __le32 buf[2];
2783 size_t len;
2784 int rc;
2785
2786 len = strlen(key);
2787 buf[0] = cpu_to_le32(len);
2788 buf[1] = cpu_to_le32(levdatum->isalias);
2789 rc = put_entry(buf, sizeof(u32), 2, fp);
2790 if (rc)
2791 return rc;
2792
2793 rc = put_entry(key, 1, len, fp);
2794 if (rc)
2795 return rc;
2796
2797 rc = mls_write_level(levdatum->level, fp);
2798 if (rc)
2799 return rc;
2800
2801 return 0;
2802}
2803
2804static int cat_write(void *vkey, void *datum, void *ptr)
2805{
2806 char *key = vkey;
2807 struct cat_datum *catdatum = datum;
2808 struct policy_data *pd = ptr;
2809 void *fp = pd->fp;
2810 __le32 buf[3];
2811 size_t len;
2812 int rc;
2813
2814 len = strlen(key);
2815 buf[0] = cpu_to_le32(len);
2816 buf[1] = cpu_to_le32(catdatum->value);
2817 buf[2] = cpu_to_le32(catdatum->isalias);
2818 rc = put_entry(buf, sizeof(u32), 3, fp);
2819 if (rc)
2820 return rc;
2821
2822 rc = put_entry(key, 1, len, fp);
2823 if (rc)
2824 return rc;
2825
2826 return 0;
2827}
2828
2829static int role_trans_write_one(void *key, void *datum, void *ptr)
2830{
2831 struct role_trans_key *rtk = key;
2832 struct role_trans_datum *rtd = datum;
2833 struct policy_data *pd = ptr;
2834 void *fp = pd->fp;
2835 struct policydb *p = pd->p;
2836 __le32 buf[3];
2837 int rc;
2838
2839 buf[0] = cpu_to_le32(rtk->role);
2840 buf[1] = cpu_to_le32(rtk->type);
2841 buf[2] = cpu_to_le32(rtd->new_role);
2842 rc = put_entry(buf, sizeof(u32), 3, fp);
2843 if (rc)
2844 return rc;
2845 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2846 buf[0] = cpu_to_le32(rtk->tclass);
2847 rc = put_entry(buf, sizeof(u32), 1, fp);
2848 if (rc)
2849 return rc;
2850 }
2851 return 0;
2852}
2853
2854static int role_trans_write(struct policydb *p, void *fp)
2855{
2856 struct policy_data pd = { .p = p, .fp = fp };
2857 __le32 buf[1];
2858 int rc;
2859
2860 buf[0] = cpu_to_le32(p->role_tr.nel);
2861 rc = put_entry(buf, sizeof(u32), 1, fp);
2862 if (rc)
2863 return rc;
2864
2865 return hashtab_map(&p->role_tr, role_trans_write_one, &pd);
2866}
2867
2868static int role_allow_write(struct role_allow *r, void *fp)
2869{
2870 struct role_allow *ra;
2871 __le32 buf[2];
2872 size_t nel;
2873 int rc;
2874
2875 nel = 0;
2876 for (ra = r; ra; ra = ra->next)
2877 nel++;
2878 buf[0] = cpu_to_le32(nel);
2879 rc = put_entry(buf, sizeof(u32), 1, fp);
2880 if (rc)
2881 return rc;
2882 for (ra = r; ra; ra = ra->next) {
2883 buf[0] = cpu_to_le32(ra->role);
2884 buf[1] = cpu_to_le32(ra->new_role);
2885 rc = put_entry(buf, sizeof(u32), 2, fp);
2886 if (rc)
2887 return rc;
2888 }
2889 return 0;
2890}
2891
2892/*
2893 * Write a security context structure
2894 * to a policydb binary representation file.
2895 */
2896static int context_write(struct policydb *p, struct context *c,
2897 void *fp)
2898{
2899 int rc;
2900 __le32 buf[3];
2901
2902 buf[0] = cpu_to_le32(c->user);
2903 buf[1] = cpu_to_le32(c->role);
2904 buf[2] = cpu_to_le32(c->type);
2905
2906 rc = put_entry(buf, sizeof(u32), 3, fp);
2907 if (rc)
2908 return rc;
2909
2910 rc = mls_write_range_helper(&c->range, fp);
2911 if (rc)
2912 return rc;
2913
2914 return 0;
2915}
2916
2917/*
2918 * The following *_write functions are used to
2919 * write the symbol data to a policy database
2920 * binary representation file.
2921 */
2922
2923static int perm_write(void *vkey, void *datum, void *fp)
2924{
2925 char *key = vkey;
2926 struct perm_datum *perdatum = datum;
2927 __le32 buf[2];
2928 size_t len;
2929 int rc;
2930
2931 len = strlen(key);
2932 buf[0] = cpu_to_le32(len);
2933 buf[1] = cpu_to_le32(perdatum->value);
2934 rc = put_entry(buf, sizeof(u32), 2, fp);
2935 if (rc)
2936 return rc;
2937
2938 rc = put_entry(key, 1, len, fp);
2939 if (rc)
2940 return rc;
2941
2942 return 0;
2943}
2944
2945static int common_write(void *vkey, void *datum, void *ptr)
2946{
2947 char *key = vkey;
2948 struct common_datum *comdatum = datum;
2949 struct policy_data *pd = ptr;
2950 void *fp = pd->fp;
2951 __le32 buf[4];
2952 size_t len;
2953 int rc;
2954
2955 len = strlen(key);
2956 buf[0] = cpu_to_le32(len);
2957 buf[1] = cpu_to_le32(comdatum->value);
2958 buf[2] = cpu_to_le32(comdatum->permissions.nprim);
2959 buf[3] = cpu_to_le32(comdatum->permissions.table.nel);
2960 rc = put_entry(buf, sizeof(u32), 4, fp);
2961 if (rc)
2962 return rc;
2963
2964 rc = put_entry(key, 1, len, fp);
2965 if (rc)
2966 return rc;
2967
2968 rc = hashtab_map(&comdatum->permissions.table, perm_write, fp);
2969 if (rc)
2970 return rc;
2971
2972 return 0;
2973}
2974
2975static int type_set_write(struct type_set *t, void *fp)
2976{
2977 int rc;
2978 __le32 buf[1];
2979
2980 if (ebitmap_write(&t->types, fp))
2981 return -EINVAL;
2982 if (ebitmap_write(&t->negset, fp))
2983 return -EINVAL;
2984
2985 buf[0] = cpu_to_le32(t->flags);
2986 rc = put_entry(buf, sizeof(u32), 1, fp);
2987 if (rc)
2988 return -EINVAL;
2989
2990 return 0;
2991}
2992
2993static int write_cons_helper(struct policydb *p, struct constraint_node *node,
2994 void *fp)
2995{
2996 struct constraint_node *c;
2997 struct constraint_expr *e;
2998 __le32 buf[3];
2999 u32 nel;
3000 int rc;
3001
3002 for (c = node; c; c = c->next) {
3003 nel = 0;
3004 for (e = c->expr; e; e = e->next)
3005 nel++;
3006 buf[0] = cpu_to_le32(c->permissions);
3007 buf[1] = cpu_to_le32(nel);
3008 rc = put_entry(buf, sizeof(u32), 2, fp);
3009 if (rc)
3010 return rc;
3011 for (e = c->expr; e; e = e->next) {
3012 buf[0] = cpu_to_le32(e->expr_type);
3013 buf[1] = cpu_to_le32(e->attr);
3014 buf[2] = cpu_to_le32(e->op);
3015 rc = put_entry(buf, sizeof(u32), 3, fp);
3016 if (rc)
3017 return rc;
3018
3019 switch (e->expr_type) {
3020 case CEXPR_NAMES:
3021 rc = ebitmap_write(&e->names, fp);
3022 if (rc)
3023 return rc;
3024 if (p->policyvers >=
3025 POLICYDB_VERSION_CONSTRAINT_NAMES) {
3026 rc = type_set_write(e->type_names, fp);
3027 if (rc)
3028 return rc;
3029 }
3030 break;
3031 default:
3032 break;
3033 }
3034 }
3035 }
3036
3037 return 0;
3038}
3039
3040static int class_write(void *vkey, void *datum, void *ptr)
3041{
3042 char *key = vkey;
3043 struct class_datum *cladatum = datum;
3044 struct policy_data *pd = ptr;
3045 void *fp = pd->fp;
3046 struct policydb *p = pd->p;
3047 struct constraint_node *c;
3048 __le32 buf[6];
3049 u32 ncons;
3050 size_t len, len2;
3051 int rc;
3052
3053 len = strlen(key);
3054 if (cladatum->comkey)
3055 len2 = strlen(cladatum->comkey);
3056 else
3057 len2 = 0;
3058
3059 ncons = 0;
3060 for (c = cladatum->constraints; c; c = c->next)
3061 ncons++;
3062
3063 buf[0] = cpu_to_le32(len);
3064 buf[1] = cpu_to_le32(len2);
3065 buf[2] = cpu_to_le32(cladatum->value);
3066 buf[3] = cpu_to_le32(cladatum->permissions.nprim);
3067 buf[4] = cpu_to_le32(cladatum->permissions.table.nel);
3068 buf[5] = cpu_to_le32(ncons);
3069 rc = put_entry(buf, sizeof(u32), 6, fp);
3070 if (rc)
3071 return rc;
3072
3073 rc = put_entry(key, 1, len, fp);
3074 if (rc)
3075 return rc;
3076
3077 if (cladatum->comkey) {
3078 rc = put_entry(cladatum->comkey, 1, len2, fp);
3079 if (rc)
3080 return rc;
3081 }
3082
3083 rc = hashtab_map(&cladatum->permissions.table, perm_write, fp);
3084 if (rc)
3085 return rc;
3086
3087 rc = write_cons_helper(p, cladatum->constraints, fp);
3088 if (rc)
3089 return rc;
3090
3091 /* write out the validatetrans rule */
3092 ncons = 0;
3093 for (c = cladatum->validatetrans; c; c = c->next)
3094 ncons++;
3095
3096 buf[0] = cpu_to_le32(ncons);
3097 rc = put_entry(buf, sizeof(u32), 1, fp);
3098 if (rc)
3099 return rc;
3100
3101 rc = write_cons_helper(p, cladatum->validatetrans, fp);
3102 if (rc)
3103 return rc;
3104
3105 if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
3106 buf[0] = cpu_to_le32(cladatum->default_user);
3107 buf[1] = cpu_to_le32(cladatum->default_role);
3108 buf[2] = cpu_to_le32(cladatum->default_range);
3109
3110 rc = put_entry(buf, sizeof(uint32_t), 3, fp);
3111 if (rc)
3112 return rc;
3113 }
3114
3115 if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
3116 buf[0] = cpu_to_le32(cladatum->default_type);
3117 rc = put_entry(buf, sizeof(uint32_t), 1, fp);
3118 if (rc)
3119 return rc;
3120 }
3121
3122 return 0;
3123}
3124
3125static int role_write(void *vkey, void *datum, void *ptr)
3126{
3127 char *key = vkey;
3128 struct role_datum *role = datum;
3129 struct policy_data *pd = ptr;
3130 void *fp = pd->fp;
3131 struct policydb *p = pd->p;
3132 __le32 buf[3];
3133 size_t items, len;
3134 int rc;
3135
3136 len = strlen(key);
3137 items = 0;
3138 buf[items++] = cpu_to_le32(len);
3139 buf[items++] = cpu_to_le32(role->value);
3140 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
3141 buf[items++] = cpu_to_le32(role->bounds);
3142
3143 BUG_ON(items > ARRAY_SIZE(buf));
3144
3145 rc = put_entry(buf, sizeof(u32), items, fp);
3146 if (rc)
3147 return rc;
3148
3149 rc = put_entry(key, 1, len, fp);
3150 if (rc)
3151 return rc;
3152
3153 rc = ebitmap_write(&role->dominates, fp);
3154 if (rc)
3155 return rc;
3156
3157 rc = ebitmap_write(&role->types, fp);
3158 if (rc)
3159 return rc;
3160
3161 return 0;
3162}
3163
3164static int type_write(void *vkey, void *datum, void *ptr)
3165{
3166 char *key = vkey;
3167 struct type_datum *typdatum = datum;
3168 struct policy_data *pd = ptr;
3169 struct policydb *p = pd->p;
3170 void *fp = pd->fp;
3171 __le32 buf[4];
3172 int rc;
3173 size_t items, len;
3174
3175 len = strlen(key);
3176 items = 0;
3177 buf[items++] = cpu_to_le32(len);
3178 buf[items++] = cpu_to_le32(typdatum->value);
3179 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
3180 u32 properties = 0;
3181
3182 if (typdatum->primary)
3183 properties |= TYPEDATUM_PROPERTY_PRIMARY;
3184
3185 if (typdatum->attribute)
3186 properties |= TYPEDATUM_PROPERTY_ATTRIBUTE;
3187
3188 buf[items++] = cpu_to_le32(properties);
3189 buf[items++] = cpu_to_le32(typdatum->bounds);
3190 } else {
3191 buf[items++] = cpu_to_le32(typdatum->primary);
3192 }
3193 BUG_ON(items > ARRAY_SIZE(buf));
3194 rc = put_entry(buf, sizeof(u32), items, fp);
3195 if (rc)
3196 return rc;
3197
3198 rc = put_entry(key, 1, len, fp);
3199 if (rc)
3200 return rc;
3201
3202 return 0;
3203}
3204
3205static int user_write(void *vkey, void *datum, void *ptr)
3206{
3207 char *key = vkey;
3208 struct user_datum *usrdatum = datum;
3209 struct policy_data *pd = ptr;
3210 struct policydb *p = pd->p;
3211 void *fp = pd->fp;
3212 __le32 buf[3];
3213 size_t items, len;
3214 int rc;
3215
3216 len = strlen(key);
3217 items = 0;
3218 buf[items++] = cpu_to_le32(len);
3219 buf[items++] = cpu_to_le32(usrdatum->value);
3220 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
3221 buf[items++] = cpu_to_le32(usrdatum->bounds);
3222 BUG_ON(items > ARRAY_SIZE(buf));
3223 rc = put_entry(buf, sizeof(u32), items, fp);
3224 if (rc)
3225 return rc;
3226
3227 rc = put_entry(key, 1, len, fp);
3228 if (rc)
3229 return rc;
3230
3231 rc = ebitmap_write(&usrdatum->roles, fp);
3232 if (rc)
3233 return rc;
3234
3235 rc = mls_write_range_helper(&usrdatum->range, fp);
3236 if (rc)
3237 return rc;
3238
3239 rc = mls_write_level(&usrdatum->dfltlevel, fp);
3240 if (rc)
3241 return rc;
3242
3243 return 0;
3244}
3245
3246static int (*write_f[SYM_NUM]) (void *key, void *datum,
3247 void *datap) =
3248{
3249 common_write,
3250 class_write,
3251 role_write,
3252 type_write,
3253 user_write,
3254 cond_write_bool,
3255 sens_write,
3256 cat_write,
3257};
3258
3259static int ocontext_write(struct policydb *p, struct policydb_compat_info *info,
3260 void *fp)
3261{
3262 unsigned int i, j, rc;
3263 size_t nel, len;
3264 __be64 prefixbuf[1];
3265 __le32 buf[3];
3266 u32 nodebuf[8];
3267 struct ocontext *c;
3268 for (i = 0; i < info->ocon_num; i++) {
3269 nel = 0;
3270 for (c = p->ocontexts[i]; c; c = c->next)
3271 nel++;
3272 buf[0] = cpu_to_le32(nel);
3273 rc = put_entry(buf, sizeof(u32), 1, fp);
3274 if (rc)
3275 return rc;
3276 for (c = p->ocontexts[i]; c; c = c->next) {
3277 switch (i) {
3278 case OCON_ISID:
3279 buf[0] = cpu_to_le32(c->sid[0]);
3280 rc = put_entry(buf, sizeof(u32), 1, fp);
3281 if (rc)
3282 return rc;
3283 rc = context_write(p, &c->context[0], fp);
3284 if (rc)
3285 return rc;
3286 break;
3287 case OCON_FS:
3288 case OCON_NETIF:
3289 len = strlen(c->u.name);
3290 buf[0] = cpu_to_le32(len);
3291 rc = put_entry(buf, sizeof(u32), 1, fp);
3292 if (rc)
3293 return rc;
3294 rc = put_entry(c->u.name, 1, len, fp);
3295 if (rc)
3296 return rc;
3297 rc = context_write(p, &c->context[0], fp);
3298 if (rc)
3299 return rc;
3300 rc = context_write(p, &c->context[1], fp);
3301 if (rc)
3302 return rc;
3303 break;
3304 case OCON_PORT:
3305 buf[0] = cpu_to_le32(c->u.port.protocol);
3306 buf[1] = cpu_to_le32(c->u.port.low_port);
3307 buf[2] = cpu_to_le32(c->u.port.high_port);
3308 rc = put_entry(buf, sizeof(u32), 3, fp);
3309 if (rc)
3310 return rc;
3311 rc = context_write(p, &c->context[0], fp);
3312 if (rc)
3313 return rc;
3314 break;
3315 case OCON_NODE:
3316 nodebuf[0] = c->u.node.addr; /* network order */
3317 nodebuf[1] = c->u.node.mask; /* network order */
3318 rc = put_entry(nodebuf, sizeof(u32), 2, fp);
3319 if (rc)
3320 return rc;
3321 rc = context_write(p, &c->context[0], fp);
3322 if (rc)
3323 return rc;
3324 break;
3325 case OCON_FSUSE:
3326 buf[0] = cpu_to_le32(c->v.behavior);
3327 len = strlen(c->u.name);
3328 buf[1] = cpu_to_le32(len);
3329 rc = put_entry(buf, sizeof(u32), 2, fp);
3330 if (rc)
3331 return rc;
3332 rc = put_entry(c->u.name, 1, len, fp);
3333 if (rc)
3334 return rc;
3335 rc = context_write(p, &c->context[0], fp);
3336 if (rc)
3337 return rc;
3338 break;
3339 case OCON_NODE6:
3340 for (j = 0; j < 4; j++)
3341 nodebuf[j] = c->u.node6.addr[j]; /* network order */
3342 for (j = 0; j < 4; j++)
3343 nodebuf[j + 4] = c->u.node6.mask[j]; /* network order */
3344 rc = put_entry(nodebuf, sizeof(u32), 8, fp);
3345 if (rc)
3346 return rc;
3347 rc = context_write(p, &c->context[0], fp);
3348 if (rc)
3349 return rc;
3350 break;
3351 case OCON_IBPKEY:
3352 /* subnet_prefix is in CPU order */
3353 prefixbuf[0] = cpu_to_be64(c->u.ibpkey.subnet_prefix);
3354
3355 rc = put_entry(prefixbuf, sizeof(u64), 1, fp);
3356 if (rc)
3357 return rc;
3358
3359 buf[0] = cpu_to_le32(c->u.ibpkey.low_pkey);
3360 buf[1] = cpu_to_le32(c->u.ibpkey.high_pkey);
3361
3362 rc = put_entry(buf, sizeof(u32), 2, fp);
3363 if (rc)
3364 return rc;
3365 rc = context_write(p, &c->context[0], fp);
3366 if (rc)
3367 return rc;
3368 break;
3369 case OCON_IBENDPORT:
3370 len = strlen(c->u.ibendport.dev_name);
3371 buf[0] = cpu_to_le32(len);
3372 buf[1] = cpu_to_le32(c->u.ibendport.port);
3373 rc = put_entry(buf, sizeof(u32), 2, fp);
3374 if (rc)
3375 return rc;
3376 rc = put_entry(c->u.ibendport.dev_name, 1, len, fp);
3377 if (rc)
3378 return rc;
3379 rc = context_write(p, &c->context[0], fp);
3380 if (rc)
3381 return rc;
3382 break;
3383 }
3384 }
3385 }
3386 return 0;
3387}
3388
3389static int genfs_write(struct policydb *p, void *fp)
3390{
3391 struct genfs *genfs;
3392 struct ocontext *c;
3393 size_t len;
3394 __le32 buf[1];
3395 int rc;
3396
3397 len = 0;
3398 for (genfs = p->genfs; genfs; genfs = genfs->next)
3399 len++;
3400 buf[0] = cpu_to_le32(len);
3401 rc = put_entry(buf, sizeof(u32), 1, fp);
3402 if (rc)
3403 return rc;
3404 for (genfs = p->genfs; genfs; genfs = genfs->next) {
3405 len = strlen(genfs->fstype);
3406 buf[0] = cpu_to_le32(len);
3407 rc = put_entry(buf, sizeof(u32), 1, fp);
3408 if (rc)
3409 return rc;
3410 rc = put_entry(genfs->fstype, 1, len, fp);
3411 if (rc)
3412 return rc;
3413 len = 0;
3414 for (c = genfs->head; c; c = c->next)
3415 len++;
3416 buf[0] = cpu_to_le32(len);
3417 rc = put_entry(buf, sizeof(u32), 1, fp);
3418 if (rc)
3419 return rc;
3420 for (c = genfs->head; c; c = c->next) {
3421 len = strlen(c->u.name);
3422 buf[0] = cpu_to_le32(len);
3423 rc = put_entry(buf, sizeof(u32), 1, fp);
3424 if (rc)
3425 return rc;
3426 rc = put_entry(c->u.name, 1, len, fp);
3427 if (rc)
3428 return rc;
3429 buf[0] = cpu_to_le32(c->v.sclass);
3430 rc = put_entry(buf, sizeof(u32), 1, fp);
3431 if (rc)
3432 return rc;
3433 rc = context_write(p, &c->context[0], fp);
3434 if (rc)
3435 return rc;
3436 }
3437 }
3438 return 0;
3439}
3440
3441static int range_write_helper(void *key, void *data, void *ptr)
3442{
3443 __le32 buf[2];
3444 struct range_trans *rt = key;
3445 struct mls_range *r = data;
3446 struct policy_data *pd = ptr;
3447 void *fp = pd->fp;
3448 struct policydb *p = pd->p;
3449 int rc;
3450
3451 buf[0] = cpu_to_le32(rt->source_type);
3452 buf[1] = cpu_to_le32(rt->target_type);
3453 rc = put_entry(buf, sizeof(u32), 2, fp);
3454 if (rc)
3455 return rc;
3456 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
3457 buf[0] = cpu_to_le32(rt->target_class);
3458 rc = put_entry(buf, sizeof(u32), 1, fp);
3459 if (rc)
3460 return rc;
3461 }
3462 rc = mls_write_range_helper(r, fp);
3463 if (rc)
3464 return rc;
3465
3466 return 0;
3467}
3468
3469static int range_write(struct policydb *p, void *fp)
3470{
3471 __le32 buf[1];
3472 int rc;
3473 struct policy_data pd;
3474
3475 pd.p = p;
3476 pd.fp = fp;
3477
3478 buf[0] = cpu_to_le32(p->range_tr.nel);
3479 rc = put_entry(buf, sizeof(u32), 1, fp);
3480 if (rc)
3481 return rc;
3482
3483 /* actually write all of the entries */
3484 rc = hashtab_map(&p->range_tr, range_write_helper, &pd);
3485 if (rc)
3486 return rc;
3487
3488 return 0;
3489}
3490
3491static int filename_write_helper_compat(void *key, void *data, void *ptr)
3492{
3493 struct filename_trans_key *ft = key;
3494 struct filename_trans_datum *datum = data;
3495 struct ebitmap_node *node;
3496 void *fp = ptr;
3497 __le32 buf[4];
3498 int rc;
3499 u32 bit, len = strlen(ft->name);
3500
3501 do {
3502 ebitmap_for_each_positive_bit(&datum->stypes, node, bit) {
3503 buf[0] = cpu_to_le32(len);
3504 rc = put_entry(buf, sizeof(u32), 1, fp);
3505 if (rc)
3506 return rc;
3507
3508 rc = put_entry(ft->name, sizeof(char), len, fp);
3509 if (rc)
3510 return rc;
3511
3512 buf[0] = cpu_to_le32(bit + 1);
3513 buf[1] = cpu_to_le32(ft->ttype);
3514 buf[2] = cpu_to_le32(ft->tclass);
3515 buf[3] = cpu_to_le32(datum->otype);
3516
3517 rc = put_entry(buf, sizeof(u32), 4, fp);
3518 if (rc)
3519 return rc;
3520 }
3521
3522 datum = datum->next;
3523 } while (unlikely(datum));
3524
3525 return 0;
3526}
3527
3528static int filename_write_helper(void *key, void *data, void *ptr)
3529{
3530 struct filename_trans_key *ft = key;
3531 struct filename_trans_datum *datum;
3532 void *fp = ptr;
3533 __le32 buf[3];
3534 int rc;
3535 u32 ndatum, len = strlen(ft->name);
3536
3537 buf[0] = cpu_to_le32(len);
3538 rc = put_entry(buf, sizeof(u32), 1, fp);
3539 if (rc)
3540 return rc;
3541
3542 rc = put_entry(ft->name, sizeof(char), len, fp);
3543 if (rc)
3544 return rc;
3545
3546 ndatum = 0;
3547 datum = data;
3548 do {
3549 ndatum++;
3550 datum = datum->next;
3551 } while (unlikely(datum));
3552
3553 buf[0] = cpu_to_le32(ft->ttype);
3554 buf[1] = cpu_to_le32(ft->tclass);
3555 buf[2] = cpu_to_le32(ndatum);
3556 rc = put_entry(buf, sizeof(u32), 3, fp);
3557 if (rc)
3558 return rc;
3559
3560 datum = data;
3561 do {
3562 rc = ebitmap_write(&datum->stypes, fp);
3563 if (rc)
3564 return rc;
3565
3566 buf[0] = cpu_to_le32(datum->otype);
3567 rc = put_entry(buf, sizeof(u32), 1, fp);
3568 if (rc)
3569 return rc;
3570
3571 datum = datum->next;
3572 } while (unlikely(datum));
3573
3574 return 0;
3575}
3576
3577static int filename_trans_write(struct policydb *p, void *fp)
3578{
3579 __le32 buf[1];
3580 int rc;
3581
3582 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
3583 return 0;
3584
3585 if (p->policyvers < POLICYDB_VERSION_COMP_FTRANS) {
3586 buf[0] = cpu_to_le32(p->compat_filename_trans_count);
3587 rc = put_entry(buf, sizeof(u32), 1, fp);
3588 if (rc)
3589 return rc;
3590
3591 rc = hashtab_map(&p->filename_trans,
3592 filename_write_helper_compat, fp);
3593 } else {
3594 buf[0] = cpu_to_le32(p->filename_trans.nel);
3595 rc = put_entry(buf, sizeof(u32), 1, fp);
3596 if (rc)
3597 return rc;
3598
3599 rc = hashtab_map(&p->filename_trans, filename_write_helper, fp);
3600 }
3601 return rc;
3602}
3603
3604/*
3605 * Write the configuration data in a policy database
3606 * structure to a policy database binary representation
3607 * file.
3608 */
3609int policydb_write(struct policydb *p, void *fp)
3610{
3611 unsigned int i, num_syms;
3612 int rc;
3613 __le32 buf[4];
3614 u32 config;
3615 size_t len;
3616 struct policydb_compat_info *info;
3617
3618 /*
3619 * refuse to write policy older than compressed avtab
3620 * to simplify the writer. There are other tests dropped
3621 * since we assume this throughout the writer code. Be
3622 * careful if you ever try to remove this restriction
3623 */
3624 if (p->policyvers < POLICYDB_VERSION_AVTAB) {
3625 pr_err("SELinux: refusing to write policy version %d."
3626 " Because it is less than version %d\n", p->policyvers,
3627 POLICYDB_VERSION_AVTAB);
3628 return -EINVAL;
3629 }
3630
3631 config = 0;
3632 if (p->mls_enabled)
3633 config |= POLICYDB_CONFIG_MLS;
3634
3635 if (p->reject_unknown)
3636 config |= REJECT_UNKNOWN;
3637 if (p->allow_unknown)
3638 config |= ALLOW_UNKNOWN;
3639
3640 /* Write the magic number and string identifiers. */
3641 buf[0] = cpu_to_le32(POLICYDB_MAGIC);
3642 len = strlen(POLICYDB_STRING);
3643 buf[1] = cpu_to_le32(len);
3644 rc = put_entry(buf, sizeof(u32), 2, fp);
3645 if (rc)
3646 return rc;
3647 rc = put_entry(POLICYDB_STRING, 1, len, fp);
3648 if (rc)
3649 return rc;
3650
3651 /* Write the version, config, and table sizes. */
3652 info = policydb_lookup_compat(p->policyvers);
3653 if (!info) {
3654 pr_err("SELinux: compatibility lookup failed for policy "
3655 "version %d", p->policyvers);
3656 return -EINVAL;
3657 }
3658
3659 buf[0] = cpu_to_le32(p->policyvers);
3660 buf[1] = cpu_to_le32(config);
3661 buf[2] = cpu_to_le32(info->sym_num);
3662 buf[3] = cpu_to_le32(info->ocon_num);
3663
3664 rc = put_entry(buf, sizeof(u32), 4, fp);
3665 if (rc)
3666 return rc;
3667
3668 if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
3669 rc = ebitmap_write(&p->policycaps, fp);
3670 if (rc)
3671 return rc;
3672 }
3673
3674 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
3675 rc = ebitmap_write(&p->permissive_map, fp);
3676 if (rc)
3677 return rc;
3678 }
3679
3680 num_syms = info->sym_num;
3681 for (i = 0; i < num_syms; i++) {
3682 struct policy_data pd;
3683
3684 pd.fp = fp;
3685 pd.p = p;
3686
3687 buf[0] = cpu_to_le32(p->symtab[i].nprim);
3688 buf[1] = cpu_to_le32(p->symtab[i].table.nel);
3689
3690 rc = put_entry(buf, sizeof(u32), 2, fp);
3691 if (rc)
3692 return rc;
3693 rc = hashtab_map(&p->symtab[i].table, write_f[i], &pd);
3694 if (rc)
3695 return rc;
3696 }
3697
3698 rc = avtab_write(p, &p->te_avtab, fp);
3699 if (rc)
3700 return rc;
3701
3702 rc = cond_write_list(p, fp);
3703 if (rc)
3704 return rc;
3705
3706 rc = role_trans_write(p, fp);
3707 if (rc)
3708 return rc;
3709
3710 rc = role_allow_write(p->role_allow, fp);
3711 if (rc)
3712 return rc;
3713
3714 rc = filename_trans_write(p, fp);
3715 if (rc)
3716 return rc;
3717
3718 rc = ocontext_write(p, info, fp);
3719 if (rc)
3720 return rc;
3721
3722 rc = genfs_write(p, fp);
3723 if (rc)
3724 return rc;
3725
3726 rc = range_write(p, fp);
3727 if (rc)
3728 return rc;
3729
3730 for (i = 0; i < p->p_types.nprim; i++) {
3731 struct ebitmap *e = &p->type_attr_map_array[i];
3732
3733 rc = ebitmap_write(e, fp);
3734 if (rc)
3735 return rc;
3736 }
3737
3738 return 0;
3739}