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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / security / selinux / ss / policydb.c
bloba7f61d52f05cd8cf5f9ad11dc10ab935ab19d097
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
45 static 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
57 static unsigned int symtab_sizes[SYM_NUM] = {
58 2,
59 32,
60 16,
61 512,
62 128,
63 16,
64 16,
65 16,
66 };
67
68 struct 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 */
75 static 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
138 static struct policydb_compat_info *policydb_lookup_compat(int version)
139 {
140 int i;
141 struct policydb_compat_info *info = NULL;
142
143 for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) {
144 if (policydb_compat[i].version == version) {
145 info = &policydb_compat[i];
146 break;
147 }
148 }
149 return info;
150 }
151
152 /*
153 * Initialize the role table.
154 */
155 static int roles_init(struct policydb *p)
156 {
157 char *key = NULL;
158 int rc;
159 struct role_datum *role;
160
161 rc = -ENOMEM;
162 role = kzalloc(sizeof(*role), GFP_KERNEL);
163 if (!role)
164 goto out;
165
166 rc = -EINVAL;
167 role->value = ++p->p_roles.nprim;
168 if (role->value != OBJECT_R_VAL)
169 goto out;
170
171 rc = -ENOMEM;
172 key = kstrdup(OBJECT_R, GFP_KERNEL);
173 if (!key)
174 goto out;
175
176 rc = hashtab_insert(p->p_roles.table, key, role);
177 if (rc)
178 goto out;
179
180 return 0;
181 out:
182 kfree(key);
183 kfree(role);
184 return rc;
185 }
186
187 static u32 filenametr_hash(struct hashtab *h, const void *k)
188 {
189 const struct filename_trans *ft = k;
190 unsigned long hash;
191 unsigned int byte_num;
192 unsigned char focus;
193
194 hash = ft->stype ^ ft->ttype ^ ft->tclass;
195
196 byte_num = 0;
197 while ((focus = ft->name[byte_num++]))
198 hash = partial_name_hash(focus, hash);
199 return hash & (h->size - 1);
200 }
201
202 static int filenametr_cmp(struct hashtab *h, const void *k1, const void *k2)
203 {
204 const struct filename_trans *ft1 = k1;
205 const struct filename_trans *ft2 = k2;
206 int v;
207
208 v = ft1->stype - ft2->stype;
209 if (v)
210 return v;
211
212 v = ft1->ttype - ft2->ttype;
213 if (v)
214 return v;
215
216 v = ft1->tclass - ft2->tclass;
217 if (v)
218 return v;
219
220 return strcmp(ft1->name, ft2->name);
221
222 }
223
224 static u32 rangetr_hash(struct hashtab *h, const void *k)
225 {
226 const struct range_trans *key = k;
227 return (key->source_type + (key->target_type << 3) +
228 (key->target_class << 5)) & (h->size - 1);
229 }
230
231 static int rangetr_cmp(struct hashtab *h, const void *k1, const void *k2)
232 {
233 const struct range_trans *key1 = k1, *key2 = k2;
234 int v;
235
236 v = key1->source_type - key2->source_type;
237 if (v)
238 return v;
239
240 v = key1->target_type - key2->target_type;
241 if (v)
242 return v;
243
244 v = key1->target_class - key2->target_class;
245
246 return v;
247 }
248
249 /*
250 * Initialize a policy database structure.
251 */
252 static int policydb_init(struct policydb *p)
253 {
254 int i, rc;
255
256 memset(p, 0, sizeof(*p));
257
258 for (i = 0; i < SYM_NUM; i++) {
259 rc = symtab_init(&p->symtab[i], symtab_sizes[i]);
260 if (rc)
261 goto out;
262 }
263
264 rc = avtab_init(&p->te_avtab);
265 if (rc)
266 goto out;
267
268 rc = roles_init(p);
269 if (rc)
270 goto out;
271
272 rc = cond_policydb_init(p);
273 if (rc)
274 goto out;
275
276 p->filename_trans = hashtab_create(filenametr_hash, filenametr_cmp, (1 << 10));
277 if (!p->filename_trans)
278 goto out;
279
280 p->range_tr = hashtab_create(rangetr_hash, rangetr_cmp, 256);
281 if (!p->range_tr)
282 goto out;
283
284 ebitmap_init(&p->filename_trans_ttypes);
285 ebitmap_init(&p->policycaps);
286 ebitmap_init(&p->permissive_map);
287
288 return 0;
289 out:
290 hashtab_destroy(p->filename_trans);
291 hashtab_destroy(p->range_tr);
292 for (i = 0; i < SYM_NUM; i++)
293 hashtab_destroy(p->symtab[i].table);
294 return rc;
295 }
296
297 /*
298 * The following *_index functions are used to
299 * define the val_to_name and val_to_struct arrays
300 * in a policy database structure. The val_to_name
301 * arrays are used when converting security context
302 * structures into string representations. The
303 * val_to_struct arrays are used when the attributes
304 * of a class, role, or user are needed.
305 */
306
307 static int common_index(void *key, void *datum, void *datap)
308 {
309 struct policydb *p;
310 struct common_datum *comdatum;
311 struct flex_array *fa;
312
313 comdatum = datum;
314 p = datap;
315 if (!comdatum->value || comdatum->value > p->p_commons.nprim)
316 return -EINVAL;
317
318 fa = p->sym_val_to_name[SYM_COMMONS];
319 if (flex_array_put_ptr(fa, comdatum->value - 1, key,
320 GFP_KERNEL | __GFP_ZERO))
321 BUG();
322 return 0;
323 }
324
325 static int class_index(void *key, void *datum, void *datap)
326 {
327 struct policydb *p;
328 struct class_datum *cladatum;
329 struct flex_array *fa;
330
331 cladatum = datum;
332 p = datap;
333 if (!cladatum->value || cladatum->value > p->p_classes.nprim)
334 return -EINVAL;
335 fa = p->sym_val_to_name[SYM_CLASSES];
336 if (flex_array_put_ptr(fa, cladatum->value - 1, key,
337 GFP_KERNEL | __GFP_ZERO))
338 BUG();
339 p->class_val_to_struct[cladatum->value - 1] = cladatum;
340 return 0;
341 }
342
343 static int role_index(void *key, void *datum, void *datap)
344 {
345 struct policydb *p;
346 struct role_datum *role;
347 struct flex_array *fa;
348
349 role = datum;
350 p = datap;
351 if (!role->value
352 || role->value > p->p_roles.nprim
353 || role->bounds > p->p_roles.nprim)
354 return -EINVAL;
355
356 fa = p->sym_val_to_name[SYM_ROLES];
357 if (flex_array_put_ptr(fa, role->value - 1, key,
358 GFP_KERNEL | __GFP_ZERO))
359 BUG();
360 p->role_val_to_struct[role->value - 1] = role;
361 return 0;
362 }
363
364 static int type_index(void *key, void *datum, void *datap)
365 {
366 struct policydb *p;
367 struct type_datum *typdatum;
368 struct flex_array *fa;
369
370 typdatum = datum;
371 p = datap;
372
373 if (typdatum->primary) {
374 if (!typdatum->value
375 || typdatum->value > p->p_types.nprim
376 || typdatum->bounds > p->p_types.nprim)
377 return -EINVAL;
378 fa = p->sym_val_to_name[SYM_TYPES];
379 if (flex_array_put_ptr(fa, typdatum->value - 1, key,
380 GFP_KERNEL | __GFP_ZERO))
381 BUG();
382
383 fa = p->type_val_to_struct_array;
384 if (flex_array_put_ptr(fa, typdatum->value - 1, typdatum,
385 GFP_KERNEL | __GFP_ZERO))
386 BUG();
387 }
388
389 return 0;
390 }
391
392 static int user_index(void *key, void *datum, void *datap)
393 {
394 struct policydb *p;
395 struct user_datum *usrdatum;
396 struct flex_array *fa;
397
398 usrdatum = datum;
399 p = datap;
400 if (!usrdatum->value
401 || usrdatum->value > p->p_users.nprim
402 || usrdatum->bounds > p->p_users.nprim)
403 return -EINVAL;
404
405 fa = p->sym_val_to_name[SYM_USERS];
406 if (flex_array_put_ptr(fa, usrdatum->value - 1, key,
407 GFP_KERNEL | __GFP_ZERO))
408 BUG();
409 p->user_val_to_struct[usrdatum->value - 1] = usrdatum;
410 return 0;
411 }
412
413 static int sens_index(void *key, void *datum, void *datap)
414 {
415 struct policydb *p;
416 struct level_datum *levdatum;
417 struct flex_array *fa;
418
419 levdatum = datum;
420 p = datap;
421
422 if (!levdatum->isalias) {
423 if (!levdatum->level->sens ||
424 levdatum->level->sens > p->p_levels.nprim)
425 return -EINVAL;
426 fa = p->sym_val_to_name[SYM_LEVELS];
427 if (flex_array_put_ptr(fa, levdatum->level->sens - 1, key,
428 GFP_KERNEL | __GFP_ZERO))
429 BUG();
430 }
431
432 return 0;
433 }
434
435 static int cat_index(void *key, void *datum, void *datap)
436 {
437 struct policydb *p;
438 struct cat_datum *catdatum;
439 struct flex_array *fa;
440
441 catdatum = datum;
442 p = datap;
443
444 if (!catdatum->isalias) {
445 if (!catdatum->value || catdatum->value > p->p_cats.nprim)
446 return -EINVAL;
447 fa = p->sym_val_to_name[SYM_CATS];
448 if (flex_array_put_ptr(fa, catdatum->value - 1, key,
449 GFP_KERNEL | __GFP_ZERO))
450 BUG();
451 }
452
453 return 0;
454 }
455
456 static int (*index_f[SYM_NUM]) (void *key, void *datum, void *datap) =
457 {
458 common_index,
459 class_index,
460 role_index,
461 type_index,
462 user_index,
463 cond_index_bool,
464 sens_index,
465 cat_index,
466 };
467
468 #ifdef DEBUG_HASHES
469 static void hash_eval(struct hashtab *h, const char *hash_name)
470 {
471 struct hashtab_info info;
472
473 hashtab_stat(h, &info);
474 printk(KERN_DEBUG "SELinux: %s: %d entries and %d/%d buckets used, "
475 "longest chain length %d\n", hash_name, h->nel,
476 info.slots_used, h->size, info.max_chain_len);
477 }
478
479 static void symtab_hash_eval(struct symtab *s)
480 {
481 int i;
482
483 for (i = 0; i < SYM_NUM; i++)
484 hash_eval(s[i].table, symtab_name[i]);
485 }
486
487 #else
488 static inline void hash_eval(struct hashtab *h, char *hash_name)
489 {
490 }
491 #endif
492
493 /*
494 * Define the other val_to_name and val_to_struct arrays
495 * in a policy database structure.
496 *
497 * Caller must clean up on failure.
498 */
499 static int policydb_index(struct policydb *p)
500 {
501 int i, rc;
502
503 printk(KERN_DEBUG "SELinux: %d users, %d roles, %d types, %d bools",
504 p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim, p->p_bools.nprim);
505 if (p->mls_enabled)
506 printk(", %d sens, %d cats", p->p_levels.nprim,
507 p->p_cats.nprim);
508 printk("\n");
509
510 printk(KERN_DEBUG "SELinux: %d classes, %d rules\n",
511 p->p_classes.nprim, p->te_avtab.nel);
512
513 #ifdef DEBUG_HASHES
514 avtab_hash_eval(&p->te_avtab, "rules");
515 symtab_hash_eval(p->symtab);
516 #endif
517
518 rc = -ENOMEM;
519 p->class_val_to_struct =
520 kmalloc(p->p_classes.nprim * sizeof(*(p->class_val_to_struct)),
521 GFP_KERNEL);
522 if (!p->class_val_to_struct)
523 goto out;
524
525 rc = -ENOMEM;
526 p->role_val_to_struct =
527 kmalloc(p->p_roles.nprim * sizeof(*(p->role_val_to_struct)),
528 GFP_KERNEL);
529 if (!p->role_val_to_struct)
530 goto out;
531
532 rc = -ENOMEM;
533 p->user_val_to_struct =
534 kmalloc(p->p_users.nprim * sizeof(*(p->user_val_to_struct)),
535 GFP_KERNEL);
536 if (!p->user_val_to_struct)
537 goto out;
538
539 /* Yes, I want the sizeof the pointer, not the structure */
540 rc = -ENOMEM;
541 p->type_val_to_struct_array = flex_array_alloc(sizeof(struct type_datum *),
542 p->p_types.nprim,
543 GFP_KERNEL | __GFP_ZERO);
544 if (!p->type_val_to_struct_array)
545 goto out;
546
547 rc = flex_array_prealloc(p->type_val_to_struct_array, 0,
548 p->p_types.nprim, GFP_KERNEL | __GFP_ZERO);
549 if (rc)
550 goto out;
551
552 rc = cond_init_bool_indexes(p);
553 if (rc)
554 goto out;
555
556 for (i = 0; i < SYM_NUM; i++) {
557 rc = -ENOMEM;
558 p->sym_val_to_name[i] = flex_array_alloc(sizeof(char *),
559 p->symtab[i].nprim,
560 GFP_KERNEL | __GFP_ZERO);
561 if (!p->sym_val_to_name[i])
562 goto out;
563
564 rc = flex_array_prealloc(p->sym_val_to_name[i],
565 0, p->symtab[i].nprim,
566 GFP_KERNEL | __GFP_ZERO);
567 if (rc)
568 goto out;
569
570 rc = hashtab_map(p->symtab[i].table, index_f[i], p);
571 if (rc)
572 goto out;
573 }
574 rc = 0;
575 out:
576 return rc;
577 }
578
579 /*
580 * The following *_destroy functions are used to
581 * free any memory allocated for each kind of
582 * symbol data in the policy database.
583 */
584
585 static int perm_destroy(void *key, void *datum, void *p)
586 {
587 kfree(key);
588 kfree(datum);
589 return 0;
590 }
591
592 static int common_destroy(void *key, void *datum, void *p)
593 {
594 struct common_datum *comdatum;
595
596 kfree(key);
597 if (datum) {
598 comdatum = datum;
599 hashtab_map(comdatum->permissions.table, perm_destroy, NULL);
600 hashtab_destroy(comdatum->permissions.table);
601 }
602 kfree(datum);
603 return 0;
604 }
605
606 static int cls_destroy(void *key, void *datum, void *p)
607 {
608 struct class_datum *cladatum;
609 struct constraint_node *constraint, *ctemp;
610 struct constraint_expr *e, *etmp;
611
612 kfree(key);
613 if (datum) {
614 cladatum = datum;
615 hashtab_map(cladatum->permissions.table, perm_destroy, NULL);
616 hashtab_destroy(cladatum->permissions.table);
617 constraint = cladatum->constraints;
618 while (constraint) {
619 e = constraint->expr;
620 while (e) {
621 ebitmap_destroy(&e->names);
622 etmp = e;
623 e = e->next;
624 kfree(etmp);
625 }
626 ctemp = constraint;
627 constraint = constraint->next;
628 kfree(ctemp);
629 }
630
631 constraint = cladatum->validatetrans;
632 while (constraint) {
633 e = constraint->expr;
634 while (e) {
635 ebitmap_destroy(&e->names);
636 etmp = e;
637 e = e->next;
638 kfree(etmp);
639 }
640 ctemp = constraint;
641 constraint = constraint->next;
642 kfree(ctemp);
643 }
644
645 kfree(cladatum->comkey);
646 }
647 kfree(datum);
648 return 0;
649 }
650
651 static int role_destroy(void *key, void *datum, void *p)
652 {
653 struct role_datum *role;
654
655 kfree(key);
656 if (datum) {
657 role = datum;
658 ebitmap_destroy(&role->dominates);
659 ebitmap_destroy(&role->types);
660 }
661 kfree(datum);
662 return 0;
663 }
664
665 static int type_destroy(void *key, void *datum, void *p)
666 {
667 kfree(key);
668 kfree(datum);
669 return 0;
670 }
671
672 static int user_destroy(void *key, void *datum, void *p)
673 {
674 struct user_datum *usrdatum;
675
676 kfree(key);
677 if (datum) {
678 usrdatum = datum;
679 ebitmap_destroy(&usrdatum->roles);
680 ebitmap_destroy(&usrdatum->range.level[0].cat);
681 ebitmap_destroy(&usrdatum->range.level[1].cat);
682 ebitmap_destroy(&usrdatum->dfltlevel.cat);
683 }
684 kfree(datum);
685 return 0;
686 }
687
688 static int sens_destroy(void *key, void *datum, void *p)
689 {
690 struct level_datum *levdatum;
691
692 kfree(key);
693 if (datum) {
694 levdatum = datum;
695 ebitmap_destroy(&levdatum->level->cat);
696 kfree(levdatum->level);
697 }
698 kfree(datum);
699 return 0;
700 }
701
702 static int cat_destroy(void *key, void *datum, void *p)
703 {
704 kfree(key);
705 kfree(datum);
706 return 0;
707 }
708
709 static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) =
710 {
711 common_destroy,
712 cls_destroy,
713 role_destroy,
714 type_destroy,
715 user_destroy,
716 cond_destroy_bool,
717 sens_destroy,
718 cat_destroy,
719 };
720
721 static int filenametr_destroy(void *key, void *datum, void *p)
722 {
723 struct filename_trans *ft = key;
724 kfree(ft->name);
725 kfree(key);
726 kfree(datum);
727 cond_resched();
728 return 0;
729 }
730
731 static int range_tr_destroy(void *key, void *datum, void *p)
732 {
733 struct mls_range *rt = datum;
734 kfree(key);
735 ebitmap_destroy(&rt->level[0].cat);
736 ebitmap_destroy(&rt->level[1].cat);
737 kfree(datum);
738 cond_resched();
739 return 0;
740 }
741
742 static void ocontext_destroy(struct ocontext *c, int i)
743 {
744 if (!c)
745 return;
746
747 context_destroy(&c->context[0]);
748 context_destroy(&c->context[1]);
749 if (i == OCON_ISID || i == OCON_FS ||
750 i == OCON_NETIF || i == OCON_FSUSE)
751 kfree(c->u.name);
752 kfree(c);
753 }
754
755 /*
756 * Free any memory allocated by a policy database structure.
757 */
758 void policydb_destroy(struct policydb *p)
759 {
760 struct ocontext *c, *ctmp;
761 struct genfs *g, *gtmp;
762 int i;
763 struct role_allow *ra, *lra = NULL;
764 struct role_trans *tr, *ltr = NULL;
765
766 for (i = 0; i < SYM_NUM; i++) {
767 cond_resched();
768 hashtab_map(p->symtab[i].table, destroy_f[i], NULL);
769 hashtab_destroy(p->symtab[i].table);
770 }
771
772 for (i = 0; i < SYM_NUM; i++) {
773 if (p->sym_val_to_name[i])
774 flex_array_free(p->sym_val_to_name[i]);
775 }
776
777 kfree(p->class_val_to_struct);
778 kfree(p->role_val_to_struct);
779 kfree(p->user_val_to_struct);
780 if (p->type_val_to_struct_array)
781 flex_array_free(p->type_val_to_struct_array);
782
783 avtab_destroy(&p->te_avtab);
784
785 for (i = 0; i < OCON_NUM; i++) {
786 cond_resched();
787 c = p->ocontexts[i];
788 while (c) {
789 ctmp = c;
790 c = c->next;
791 ocontext_destroy(ctmp, i);
792 }
793 p->ocontexts[i] = NULL;
794 }
795
796 g = p->genfs;
797 while (g) {
798 cond_resched();
799 kfree(g->fstype);
800 c = g->head;
801 while (c) {
802 ctmp = c;
803 c = c->next;
804 ocontext_destroy(ctmp, OCON_FSUSE);
805 }
806 gtmp = g;
807 g = g->next;
808 kfree(gtmp);
809 }
810 p->genfs = NULL;
811
812 cond_policydb_destroy(p);
813
814 for (tr = p->role_tr; tr; tr = tr->next) {
815 cond_resched();
816 kfree(ltr);
817 ltr = tr;
818 }
819 kfree(ltr);
820
821 for (ra = p->role_allow; ra; ra = ra->next) {
822 cond_resched();
823 kfree(lra);
824 lra = ra;
825 }
826 kfree(lra);
827
828 hashtab_map(p->filename_trans, filenametr_destroy, NULL);
829 hashtab_destroy(p->filename_trans);
830
831 hashtab_map(p->range_tr, range_tr_destroy, NULL);
832 hashtab_destroy(p->range_tr);
833
834 if (p->type_attr_map_array) {
835 for (i = 0; i < p->p_types.nprim; i++) {
836 struct ebitmap *e;
837
838 e = flex_array_get(p->type_attr_map_array, i);
839 if (!e)
840 continue;
841 ebitmap_destroy(e);
842 }
843 flex_array_free(p->type_attr_map_array);
844 }
845
846 ebitmap_destroy(&p->filename_trans_ttypes);
847 ebitmap_destroy(&p->policycaps);
848 ebitmap_destroy(&p->permissive_map);
849
850 return;
851 }
852
853 /*
854 * Load the initial SIDs specified in a policy database
855 * structure into a SID table.
856 */
857 int policydb_load_isids(struct policydb *p, struct sidtab *s)
858 {
859 struct ocontext *head, *c;
860 int rc;
861
862 rc = sidtab_init(s);
863 if (rc) {
864 printk(KERN_ERR "SELinux: out of memory on SID table init\n");
865 goto out;
866 }
867
868 head = p->ocontexts[OCON_ISID];
869 for (c = head; c; c = c->next) {
870 rc = -EINVAL;
871 if (!c->context[0].user) {
872 printk(KERN_ERR "SELinux: SID %s was never defined.\n",
873 c->u.name);
874 goto out;
875 }
876
877 rc = sidtab_insert(s, c->sid[0], &c->context[0]);
878 if (rc) {
879 printk(KERN_ERR "SELinux: unable to load initial SID %s.\n",
880 c->u.name);
881 goto out;
882 }
883 }
884 rc = 0;
885 out:
886 return rc;
887 }
888
889 int policydb_class_isvalid(struct policydb *p, unsigned int class)
890 {
891 if (!class || class > p->p_classes.nprim)
892 return 0;
893 return 1;
894 }
895
896 int policydb_role_isvalid(struct policydb *p, unsigned int role)
897 {
898 if (!role || role > p->p_roles.nprim)
899 return 0;
900 return 1;
901 }
902
903 int policydb_type_isvalid(struct policydb *p, unsigned int type)
904 {
905 if (!type || type > p->p_types.nprim)
906 return 0;
907 return 1;
908 }
909
910 /*
911 * Return 1 if the fields in the security context
912 * structure `c' are valid. Return 0 otherwise.
913 */
914 int policydb_context_isvalid(struct policydb *p, struct context *c)
915 {
916 struct role_datum *role;
917 struct user_datum *usrdatum;
918
919 if (!c->role || c->role > p->p_roles.nprim)
920 return 0;
921
922 if (!c->user || c->user > p->p_users.nprim)
923 return 0;
924
925 if (!c->type || c->type > p->p_types.nprim)
926 return 0;
927
928 if (c->role != OBJECT_R_VAL) {
929 /*
930 * Role must be authorized for the type.
931 */
932 role = p->role_val_to_struct[c->role - 1];
933 if (!ebitmap_get_bit(&role->types, c->type - 1))
934 /* role may not be associated with type */
935 return 0;
936
937 /*
938 * User must be authorized for the role.
939 */
940 usrdatum = p->user_val_to_struct[c->user - 1];
941 if (!usrdatum)
942 return 0;
943
944 if (!ebitmap_get_bit(&usrdatum->roles, c->role - 1))
945 /* user may not be associated with role */
946 return 0;
947 }
948
949 if (!mls_context_isvalid(p, c))
950 return 0;
951
952 return 1;
953 }
954
955 /*
956 * Read a MLS range structure from a policydb binary
957 * representation file.
958 */
959 static int mls_read_range_helper(struct mls_range *r, void *fp)
960 {
961 __le32 buf[2];
962 u32 items;
963 int rc;
964
965 rc = next_entry(buf, fp, sizeof(u32));
966 if (rc)
967 goto out;
968
969 rc = -EINVAL;
970 items = le32_to_cpu(buf[0]);
971 if (items > ARRAY_SIZE(buf)) {
972 printk(KERN_ERR "SELinux: mls: range overflow\n");
973 goto out;
974 }
975
976 rc = next_entry(buf, fp, sizeof(u32) * items);
977 if (rc) {
978 printk(KERN_ERR "SELinux: mls: truncated range\n");
979 goto out;
980 }
981
982 r->level[0].sens = le32_to_cpu(buf[0]);
983 if (items > 1)
984 r->level[1].sens = le32_to_cpu(buf[1]);
985 else
986 r->level[1].sens = r->level[0].sens;
987
988 rc = ebitmap_read(&r->level[0].cat, fp);
989 if (rc) {
990 printk(KERN_ERR "SELinux: mls: error reading low categories\n");
991 goto out;
992 }
993 if (items > 1) {
994 rc = ebitmap_read(&r->level[1].cat, fp);
995 if (rc) {
996 printk(KERN_ERR "SELinux: mls: error reading high categories\n");
997 goto bad_high;
998 }
999 } else {
1000 rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat);
1001 if (rc) {
1002 printk(KERN_ERR "SELinux: mls: out of memory\n");
1003 goto bad_high;
1004 }
1005 }
1006
1007 return 0;
1008 bad_high:
1009 ebitmap_destroy(&r->level[0].cat);
1010 out:
1011 return rc;
1012 }
1013
1014 /*
1015 * Read and validate a security context structure
1016 * from a policydb binary representation file.
1017 */
1018 static int context_read_and_validate(struct context *c,
1019 struct policydb *p,
1020 void *fp)
1021 {
1022 __le32 buf[3];
1023 int rc;
1024
1025 rc = next_entry(buf, fp, sizeof buf);
1026 if (rc) {
1027 printk(KERN_ERR "SELinux: context truncated\n");
1028 goto out;
1029 }
1030 c->user = le32_to_cpu(buf[0]);
1031 c->role = le32_to_cpu(buf[1]);
1032 c->type = le32_to_cpu(buf[2]);
1033 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1034 rc = mls_read_range_helper(&c->range, fp);
1035 if (rc) {
1036 printk(KERN_ERR "SELinux: error reading MLS range of context\n");
1037 goto out;
1038 }
1039 }
1040
1041 rc = -EINVAL;
1042 if (!policydb_context_isvalid(p, c)) {
1043 printk(KERN_ERR "SELinux: invalid security context\n");
1044 context_destroy(c);
1045 goto out;
1046 }
1047 rc = 0;
1048 out:
1049 return rc;
1050 }
1051
1052 /*
1053 * The following *_read functions are used to
1054 * read the symbol data from a policy database
1055 * binary representation file.
1056 */
1057
1058 static int perm_read(struct policydb *p, struct hashtab *h, void *fp)
1059 {
1060 char *key = NULL;
1061 struct perm_datum *perdatum;
1062 int rc;
1063 __le32 buf[2];
1064 u32 len;
1065
1066 rc = -ENOMEM;
1067 perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
1068 if (!perdatum)
1069 goto bad;
1070
1071 rc = next_entry(buf, fp, sizeof buf);
1072 if (rc)
1073 goto bad;
1074
1075 len = le32_to_cpu(buf[0]);
1076 perdatum->value = le32_to_cpu(buf[1]);
1077
1078 rc = -ENOMEM;
1079 key = kmalloc(len + 1, GFP_KERNEL);
1080 if (!key)
1081 goto bad;
1082
1083 rc = next_entry(key, fp, len);
1084 if (rc)
1085 goto bad;
1086 key[len] = '\0';
1087
1088 rc = hashtab_insert(h, key, perdatum);
1089 if (rc)
1090 goto bad;
1091
1092 return 0;
1093 bad:
1094 perm_destroy(key, perdatum, NULL);
1095 return rc;
1096 }
1097
1098 static int common_read(struct policydb *p, struct hashtab *h, void *fp)
1099 {
1100 char *key = NULL;
1101 struct common_datum *comdatum;
1102 __le32 buf[4];
1103 u32 len, nel;
1104 int i, rc;
1105
1106 rc = -ENOMEM;
1107 comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
1108 if (!comdatum)
1109 goto bad;
1110
1111 rc = next_entry(buf, fp, sizeof buf);
1112 if (rc)
1113 goto bad;
1114
1115 len = le32_to_cpu(buf[0]);
1116 comdatum->value = le32_to_cpu(buf[1]);
1117
1118 rc = symtab_init(&comdatum->permissions, PERM_SYMTAB_SIZE);
1119 if (rc)
1120 goto bad;
1121 comdatum->permissions.nprim = le32_to_cpu(buf[2]);
1122 nel = le32_to_cpu(buf[3]);
1123
1124 rc = -ENOMEM;
1125 key = kmalloc(len + 1, GFP_KERNEL);
1126 if (!key)
1127 goto bad;
1128
1129 rc = next_entry(key, fp, len);
1130 if (rc)
1131 goto bad;
1132 key[len] = '\0';
1133
1134 for (i = 0; i < nel; i++) {
1135 rc = perm_read(p, comdatum->permissions.table, fp);
1136 if (rc)
1137 goto bad;
1138 }
1139
1140 rc = hashtab_insert(h, key, comdatum);
1141 if (rc)
1142 goto bad;
1143 return 0;
1144 bad:
1145 common_destroy(key, comdatum, NULL);
1146 return rc;
1147 }
1148
1149 static int read_cons_helper(struct constraint_node **nodep, int ncons,
1150 int allowxtarget, void *fp)
1151 {
1152 struct constraint_node *c, *lc;
1153 struct constraint_expr *e, *le;
1154 __le32 buf[3];
1155 u32 nexpr;
1156 int rc, i, j, depth;
1157
1158 lc = NULL;
1159 for (i = 0; i < ncons; i++) {
1160 c = kzalloc(sizeof(*c), GFP_KERNEL);
1161 if (!c)
1162 return -ENOMEM;
1163
1164 if (lc)
1165 lc->next = c;
1166 else
1167 *nodep = c;
1168
1169 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1170 if (rc)
1171 return rc;
1172 c->permissions = le32_to_cpu(buf[0]);
1173 nexpr = le32_to_cpu(buf[1]);
1174 le = NULL;
1175 depth = -1;
1176 for (j = 0; j < nexpr; j++) {
1177 e = kzalloc(sizeof(*e), GFP_KERNEL);
1178 if (!e)
1179 return -ENOMEM;
1180
1181 if (le)
1182 le->next = e;
1183 else
1184 c->expr = e;
1185
1186 rc = next_entry(buf, fp, (sizeof(u32) * 3));
1187 if (rc)
1188 return rc;
1189 e->expr_type = le32_to_cpu(buf[0]);
1190 e->attr = le32_to_cpu(buf[1]);
1191 e->op = le32_to_cpu(buf[2]);
1192
1193 switch (e->expr_type) {
1194 case CEXPR_NOT:
1195 if (depth < 0)
1196 return -EINVAL;
1197 break;
1198 case CEXPR_AND:
1199 case CEXPR_OR:
1200 if (depth < 1)
1201 return -EINVAL;
1202 depth--;
1203 break;
1204 case CEXPR_ATTR:
1205 if (depth == (CEXPR_MAXDEPTH - 1))
1206 return -EINVAL;
1207 depth++;
1208 break;
1209 case CEXPR_NAMES:
1210 if (!allowxtarget && (e->attr & CEXPR_XTARGET))
1211 return -EINVAL;
1212 if (depth == (CEXPR_MAXDEPTH - 1))
1213 return -EINVAL;
1214 depth++;
1215 rc = ebitmap_read(&e->names, fp);
1216 if (rc)
1217 return rc;
1218 break;
1219 default:
1220 return -EINVAL;
1221 }
1222 le = e;
1223 }
1224 if (depth != 0)
1225 return -EINVAL;
1226 lc = c;
1227 }
1228
1229 return 0;
1230 }
1231
1232 static int class_read(struct policydb *p, struct hashtab *h, void *fp)
1233 {
1234 char *key = NULL;
1235 struct class_datum *cladatum;
1236 __le32 buf[6];
1237 u32 len, len2, ncons, nel;
1238 int i, rc;
1239
1240 rc = -ENOMEM;
1241 cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
1242 if (!cladatum)
1243 goto bad;
1244
1245 rc = next_entry(buf, fp, sizeof(u32)*6);
1246 if (rc)
1247 goto bad;
1248
1249 len = le32_to_cpu(buf[0]);
1250 len2 = le32_to_cpu(buf[1]);
1251 cladatum->value = le32_to_cpu(buf[2]);
1252
1253 rc = symtab_init(&cladatum->permissions, PERM_SYMTAB_SIZE);
1254 if (rc)
1255 goto bad;
1256 cladatum->permissions.nprim = le32_to_cpu(buf[3]);
1257 nel = le32_to_cpu(buf[4]);
1258
1259 ncons = le32_to_cpu(buf[5]);
1260
1261 rc = -ENOMEM;
1262 key = kmalloc(len + 1, GFP_KERNEL);
1263 if (!key)
1264 goto bad;
1265
1266 rc = next_entry(key, fp, len);
1267 if (rc)
1268 goto bad;
1269 key[len] = '\0';
1270
1271 if (len2) {
1272 rc = -ENOMEM;
1273 cladatum->comkey = kmalloc(len2 + 1, GFP_KERNEL);
1274 if (!cladatum->comkey)
1275 goto bad;
1276 rc = next_entry(cladatum->comkey, fp, len2);
1277 if (rc)
1278 goto bad;
1279 cladatum->comkey[len2] = '\0';
1280
1281 rc = -EINVAL;
1282 cladatum->comdatum = hashtab_search(p->p_commons.table, cladatum->comkey);
1283 if (!cladatum->comdatum) {
1284 printk(KERN_ERR "SELinux: unknown common %s\n", cladatum->comkey);
1285 goto bad;
1286 }
1287 }
1288 for (i = 0; i < nel; i++) {
1289 rc = perm_read(p, cladatum->permissions.table, fp);
1290 if (rc)
1291 goto bad;
1292 }
1293
1294 rc = read_cons_helper(&cladatum->constraints, ncons, 0, fp);
1295 if (rc)
1296 goto bad;
1297
1298 if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
1299 /* grab the validatetrans rules */
1300 rc = next_entry(buf, fp, sizeof(u32));
1301 if (rc)
1302 goto bad;
1303 ncons = le32_to_cpu(buf[0]);
1304 rc = read_cons_helper(&cladatum->validatetrans, ncons, 1, fp);
1305 if (rc)
1306 goto bad;
1307 }
1308
1309 rc = hashtab_insert(h, key, cladatum);
1310 if (rc)
1311 goto bad;
1312
1313 return 0;
1314 bad:
1315 cls_destroy(key, cladatum, NULL);
1316 return rc;
1317 }
1318
1319 static int role_read(struct policydb *p, struct hashtab *h, void *fp)
1320 {
1321 char *key = NULL;
1322 struct role_datum *role;
1323 int rc, to_read = 2;
1324 __le32 buf[3];
1325 u32 len;
1326
1327 rc = -ENOMEM;
1328 role = kzalloc(sizeof(*role), GFP_KERNEL);
1329 if (!role)
1330 goto bad;
1331
1332 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1333 to_read = 3;
1334
1335 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1336 if (rc)
1337 goto bad;
1338
1339 len = le32_to_cpu(buf[0]);
1340 role->value = le32_to_cpu(buf[1]);
1341 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1342 role->bounds = le32_to_cpu(buf[2]);
1343
1344 rc = -ENOMEM;
1345 key = kmalloc(len + 1, GFP_KERNEL);
1346 if (!key)
1347 goto bad;
1348
1349 rc = next_entry(key, fp, len);
1350 if (rc)
1351 goto bad;
1352 key[len] = '\0';
1353
1354 rc = ebitmap_read(&role->dominates, fp);
1355 if (rc)
1356 goto bad;
1357
1358 rc = ebitmap_read(&role->types, fp);
1359 if (rc)
1360 goto bad;
1361
1362 if (strcmp(key, OBJECT_R) == 0) {
1363 rc = -EINVAL;
1364 if (role->value != OBJECT_R_VAL) {
1365 printk(KERN_ERR "SELinux: Role %s has wrong value %d\n",
1366 OBJECT_R, role->value);
1367 goto bad;
1368 }
1369 rc = 0;
1370 goto bad;
1371 }
1372
1373 rc = hashtab_insert(h, key, role);
1374 if (rc)
1375 goto bad;
1376 return 0;
1377 bad:
1378 role_destroy(key, role, NULL);
1379 return rc;
1380 }
1381
1382 static int type_read(struct policydb *p, struct hashtab *h, void *fp)
1383 {
1384 char *key = NULL;
1385 struct type_datum *typdatum;
1386 int rc, to_read = 3;
1387 __le32 buf[4];
1388 u32 len;
1389
1390 rc = -ENOMEM;
1391 typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL);
1392 if (!typdatum)
1393 goto bad;
1394
1395 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1396 to_read = 4;
1397
1398 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1399 if (rc)
1400 goto bad;
1401
1402 len = le32_to_cpu(buf[0]);
1403 typdatum->value = le32_to_cpu(buf[1]);
1404 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
1405 u32 prop = le32_to_cpu(buf[2]);
1406
1407 if (prop & TYPEDATUM_PROPERTY_PRIMARY)
1408 typdatum->primary = 1;
1409 if (prop & TYPEDATUM_PROPERTY_ATTRIBUTE)
1410 typdatum->attribute = 1;
1411
1412 typdatum->bounds = le32_to_cpu(buf[3]);
1413 } else {
1414 typdatum->primary = le32_to_cpu(buf[2]);
1415 }
1416
1417 rc = -ENOMEM;
1418 key = kmalloc(len + 1, GFP_KERNEL);
1419 if (!key)
1420 goto bad;
1421 rc = next_entry(key, fp, len);
1422 if (rc)
1423 goto bad;
1424 key[len] = '\0';
1425
1426 rc = hashtab_insert(h, key, typdatum);
1427 if (rc)
1428 goto bad;
1429 return 0;
1430 bad:
1431 type_destroy(key, typdatum, NULL);
1432 return rc;
1433 }
1434
1435
1436 /*
1437 * Read a MLS level structure from a policydb binary
1438 * representation file.
1439 */
1440 static int mls_read_level(struct mls_level *lp, void *fp)
1441 {
1442 __le32 buf[1];
1443 int rc;
1444
1445 memset(lp, 0, sizeof(*lp));
1446
1447 rc = next_entry(buf, fp, sizeof buf);
1448 if (rc) {
1449 printk(KERN_ERR "SELinux: mls: truncated level\n");
1450 return rc;
1451 }
1452 lp->sens = le32_to_cpu(buf[0]);
1453
1454 rc = ebitmap_read(&lp->cat, fp);
1455 if (rc) {
1456 printk(KERN_ERR "SELinux: mls: error reading level categories\n");
1457 return rc;
1458 }
1459 return 0;
1460 }
1461
1462 static int user_read(struct policydb *p, struct hashtab *h, void *fp)
1463 {
1464 char *key = NULL;
1465 struct user_datum *usrdatum;
1466 int rc, to_read = 2;
1467 __le32 buf[3];
1468 u32 len;
1469
1470 rc = -ENOMEM;
1471 usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
1472 if (!usrdatum)
1473 goto bad;
1474
1475 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1476 to_read = 3;
1477
1478 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1479 if (rc)
1480 goto bad;
1481
1482 len = le32_to_cpu(buf[0]);
1483 usrdatum->value = le32_to_cpu(buf[1]);
1484 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1485 usrdatum->bounds = le32_to_cpu(buf[2]);
1486
1487 rc = -ENOMEM;
1488 key = kmalloc(len + 1, GFP_KERNEL);
1489 if (!key)
1490 goto bad;
1491 rc = next_entry(key, fp, len);
1492 if (rc)
1493 goto bad;
1494 key[len] = '\0';
1495
1496 rc = ebitmap_read(&usrdatum->roles, fp);
1497 if (rc)
1498 goto bad;
1499
1500 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1501 rc = mls_read_range_helper(&usrdatum->range, fp);
1502 if (rc)
1503 goto bad;
1504 rc = mls_read_level(&usrdatum->dfltlevel, fp);
1505 if (rc)
1506 goto bad;
1507 }
1508
1509 rc = hashtab_insert(h, key, usrdatum);
1510 if (rc)
1511 goto bad;
1512 return 0;
1513 bad:
1514 user_destroy(key, usrdatum, NULL);
1515 return rc;
1516 }
1517
1518 static int sens_read(struct policydb *p, struct hashtab *h, void *fp)
1519 {
1520 char *key = NULL;
1521 struct level_datum *levdatum;
1522 int rc;
1523 __le32 buf[2];
1524 u32 len;
1525
1526 rc = -ENOMEM;
1527 levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC);
1528 if (!levdatum)
1529 goto bad;
1530
1531 rc = next_entry(buf, fp, sizeof buf);
1532 if (rc)
1533 goto bad;
1534
1535 len = le32_to_cpu(buf[0]);
1536 levdatum->isalias = le32_to_cpu(buf[1]);
1537
1538 rc = -ENOMEM;
1539 key = kmalloc(len + 1, GFP_ATOMIC);
1540 if (!key)
1541 goto bad;
1542 rc = next_entry(key, fp, len);
1543 if (rc)
1544 goto bad;
1545 key[len] = '\0';
1546
1547 rc = -ENOMEM;
1548 levdatum->level = kmalloc(sizeof(struct mls_level), GFP_ATOMIC);
1549 if (!levdatum->level)
1550 goto bad;
1551
1552 rc = mls_read_level(levdatum->level, fp);
1553 if (rc)
1554 goto bad;
1555
1556 rc = hashtab_insert(h, key, levdatum);
1557 if (rc)
1558 goto bad;
1559 return 0;
1560 bad:
1561 sens_destroy(key, levdatum, NULL);
1562 return rc;
1563 }
1564
1565 static int cat_read(struct policydb *p, struct hashtab *h, void *fp)
1566 {
1567 char *key = NULL;
1568 struct cat_datum *catdatum;
1569 int rc;
1570 __le32 buf[3];
1571 u32 len;
1572
1573 rc = -ENOMEM;
1574 catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC);
1575 if (!catdatum)
1576 goto bad;
1577
1578 rc = next_entry(buf, fp, sizeof buf);
1579 if (rc)
1580 goto bad;
1581
1582 len = le32_to_cpu(buf[0]);
1583 catdatum->value = le32_to_cpu(buf[1]);
1584 catdatum->isalias = le32_to_cpu(buf[2]);
1585
1586 rc = -ENOMEM;
1587 key = kmalloc(len + 1, GFP_ATOMIC);
1588 if (!key)
1589 goto bad;
1590 rc = next_entry(key, fp, len);
1591 if (rc)
1592 goto bad;
1593 key[len] = '\0';
1594
1595 rc = hashtab_insert(h, key, catdatum);
1596 if (rc)
1597 goto bad;
1598 return 0;
1599 bad:
1600 cat_destroy(key, catdatum, NULL);
1601 return rc;
1602 }
1603
1604 static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, void *fp) =
1605 {
1606 common_read,
1607 class_read,
1608 role_read,
1609 type_read,
1610 user_read,
1611 cond_read_bool,
1612 sens_read,
1613 cat_read,
1614 };
1615
1616 static int user_bounds_sanity_check(void *key, void *datum, void *datap)
1617 {
1618 struct user_datum *upper, *user;
1619 struct policydb *p = datap;
1620 int depth = 0;
1621
1622 upper = user = datum;
1623 while (upper->bounds) {
1624 struct ebitmap_node *node;
1625 unsigned long bit;
1626
1627 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1628 printk(KERN_ERR "SELinux: user %s: "
1629 "too deep or looped boundary",
1630 (char *) key);
1631 return -EINVAL;
1632 }
1633
1634 upper = p->user_val_to_struct[upper->bounds - 1];
1635 ebitmap_for_each_positive_bit(&user->roles, node, bit) {
1636 if (ebitmap_get_bit(&upper->roles, bit))
1637 continue;
1638
1639 printk(KERN_ERR
1640 "SELinux: boundary violated policy: "
1641 "user=%s role=%s bounds=%s\n",
1642 sym_name(p, SYM_USERS, user->value - 1),
1643 sym_name(p, SYM_ROLES, bit),
1644 sym_name(p, SYM_USERS, upper->value - 1));
1645
1646 return -EINVAL;
1647 }
1648 }
1649
1650 return 0;
1651 }
1652
1653 static int role_bounds_sanity_check(void *key, void *datum, void *datap)
1654 {
1655 struct role_datum *upper, *role;
1656 struct policydb *p = datap;
1657 int depth = 0;
1658
1659 upper = role = datum;
1660 while (upper->bounds) {
1661 struct ebitmap_node *node;
1662 unsigned long bit;
1663
1664 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1665 printk(KERN_ERR "SELinux: role %s: "
1666 "too deep or looped bounds\n",
1667 (char *) key);
1668 return -EINVAL;
1669 }
1670
1671 upper = p->role_val_to_struct[upper->bounds - 1];
1672 ebitmap_for_each_positive_bit(&role->types, node, bit) {
1673 if (ebitmap_get_bit(&upper->types, bit))
1674 continue;
1675
1676 printk(KERN_ERR
1677 "SELinux: boundary violated policy: "
1678 "role=%s type=%s bounds=%s\n",
1679 sym_name(p, SYM_ROLES, role->value - 1),
1680 sym_name(p, SYM_TYPES, bit),
1681 sym_name(p, SYM_ROLES, upper->value - 1));
1682
1683 return -EINVAL;
1684 }
1685 }
1686
1687 return 0;
1688 }
1689
1690 static int type_bounds_sanity_check(void *key, void *datum, void *datap)
1691 {
1692 struct type_datum *upper;
1693 struct policydb *p = datap;
1694 int depth = 0;
1695
1696 upper = datum;
1697 while (upper->bounds) {
1698 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1699 printk(KERN_ERR "SELinux: type %s: "
1700 "too deep or looped boundary\n",
1701 (char *) key);
1702 return -EINVAL;
1703 }
1704
1705 upper = flex_array_get_ptr(p->type_val_to_struct_array,
1706 upper->bounds - 1);
1707 BUG_ON(!upper);
1708
1709 if (upper->attribute) {
1710 printk(KERN_ERR "SELinux: type %s: "
1711 "bounded by attribute %s",
1712 (char *) key,
1713 sym_name(p, SYM_TYPES, upper->value - 1));
1714 return -EINVAL;
1715 }
1716 }
1717
1718 return 0;
1719 }
1720
1721 static int policydb_bounds_sanity_check(struct policydb *p)
1722 {
1723 int rc;
1724
1725 if (p->policyvers < POLICYDB_VERSION_BOUNDARY)
1726 return 0;
1727
1728 rc = hashtab_map(p->p_users.table,
1729 user_bounds_sanity_check, p);
1730 if (rc)
1731 return rc;
1732
1733 rc = hashtab_map(p->p_roles.table,
1734 role_bounds_sanity_check, p);
1735 if (rc)
1736 return rc;
1737
1738 rc = hashtab_map(p->p_types.table,
1739 type_bounds_sanity_check, p);
1740 if (rc)
1741 return rc;
1742
1743 return 0;
1744 }
1745
1746 u16 string_to_security_class(struct policydb *p, const char *name)
1747 {
1748 struct class_datum *cladatum;
1749
1750 cladatum = hashtab_search(p->p_classes.table, name);
1751 if (!cladatum)
1752 return 0;
1753
1754 return cladatum->value;
1755 }
1756
1757 u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name)
1758 {
1759 struct class_datum *cladatum;
1760 struct perm_datum *perdatum = NULL;
1761 struct common_datum *comdatum;
1762
1763 if (!tclass || tclass > p->p_classes.nprim)
1764 return 0;
1765
1766 cladatum = p->class_val_to_struct[tclass-1];
1767 comdatum = cladatum->comdatum;
1768 if (comdatum)
1769 perdatum = hashtab_search(comdatum->permissions.table,
1770 name);
1771 if (!perdatum)
1772 perdatum = hashtab_search(cladatum->permissions.table,
1773 name);
1774 if (!perdatum)
1775 return 0;
1776
1777 return 1U << (perdatum->value-1);
1778 }
1779
1780 static int range_read(struct policydb *p, void *fp)
1781 {
1782 struct range_trans *rt = NULL;
1783 struct mls_range *r = NULL;
1784 int i, rc;
1785 __le32 buf[2];
1786 u32 nel;
1787
1788 if (p->policyvers < POLICYDB_VERSION_MLS)
1789 return 0;
1790
1791 rc = next_entry(buf, fp, sizeof(u32));
1792 if (rc)
1793 goto out;
1794
1795 nel = le32_to_cpu(buf[0]);
1796 for (i = 0; i < nel; i++) {
1797 rc = -ENOMEM;
1798 rt = kzalloc(sizeof(*rt), GFP_KERNEL);
1799 if (!rt)
1800 goto out;
1801
1802 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1803 if (rc)
1804 goto out;
1805
1806 rt->source_type = le32_to_cpu(buf[0]);
1807 rt->target_type = le32_to_cpu(buf[1]);
1808 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
1809 rc = next_entry(buf, fp, sizeof(u32));
1810 if (rc)
1811 goto out;
1812 rt->target_class = le32_to_cpu(buf[0]);
1813 } else
1814 rt->target_class = p->process_class;
1815
1816 rc = -EINVAL;
1817 if (!policydb_type_isvalid(p, rt->source_type) ||
1818 !policydb_type_isvalid(p, rt->target_type) ||
1819 !policydb_class_isvalid(p, rt->target_class))
1820 goto out;
1821
1822 rc = -ENOMEM;
1823 r = kzalloc(sizeof(*r), GFP_KERNEL);
1824 if (!r)
1825 goto out;
1826
1827 rc = mls_read_range_helper(r, fp);
1828 if (rc)
1829 goto out;
1830
1831 rc = -EINVAL;
1832 if (!mls_range_isvalid(p, r)) {
1833 printk(KERN_WARNING "SELinux: rangetrans: invalid range\n");
1834 goto out;
1835 }
1836
1837 rc = hashtab_insert(p->range_tr, rt, r);
1838 if (rc)
1839 goto out;
1840
1841 rt = NULL;
1842 r = NULL;
1843 }
1844 hash_eval(p->range_tr, "rangetr");
1845 rc = 0;
1846 out:
1847 kfree(rt);
1848 kfree(r);
1849 return rc;
1850 }
1851
1852 static int filename_trans_read(struct policydb *p, void *fp)
1853 {
1854 struct filename_trans *ft;
1855 struct filename_trans_datum *otype;
1856 char *name;
1857 u32 nel, len;
1858 __le32 buf[4];
1859 int rc, i;
1860
1861 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
1862 return 0;
1863
1864 rc = next_entry(buf, fp, sizeof(u32));
1865 if (rc)
1866 return rc;
1867 nel = le32_to_cpu(buf[0]);
1868
1869 for (i = 0; i < nel; i++) {
1870 ft = NULL;
1871 otype = NULL;
1872 name = NULL;
1873
1874 rc = -ENOMEM;
1875 ft = kzalloc(sizeof(*ft), GFP_KERNEL);
1876 if (!ft)
1877 goto out;
1878
1879 rc = -ENOMEM;
1880 otype = kmalloc(sizeof(*otype), GFP_KERNEL);
1881 if (!otype)
1882 goto out;
1883
1884 /* length of the path component string */
1885 rc = next_entry(buf, fp, sizeof(u32));
1886 if (rc)
1887 goto out;
1888 len = le32_to_cpu(buf[0]);
1889
1890 rc = -ENOMEM;
1891 name = kmalloc(len + 1, GFP_KERNEL);
1892 if (!name)
1893 goto out;
1894
1895 ft->name = name;
1896
1897 /* path component string */
1898 rc = next_entry(name, fp, len);
1899 if (rc)
1900 goto out;
1901 name[len] = 0;
1902
1903 rc = next_entry(buf, fp, sizeof(u32) * 4);
1904 if (rc)
1905 goto out;
1906
1907 ft->stype = le32_to_cpu(buf[0]);
1908 ft->ttype = le32_to_cpu(buf[1]);
1909 ft->tclass = le32_to_cpu(buf[2]);
1910
1911 otype->otype = le32_to_cpu(buf[3]);
1912
1913 rc = ebitmap_set_bit(&p->filename_trans_ttypes, ft->ttype, 1);
1914 if (rc)
1915 goto out;
1916
1917 hashtab_insert(p->filename_trans, ft, otype);
1918 }
1919 hash_eval(p->filename_trans, "filenametr");
1920 return 0;
1921 out:
1922 kfree(ft);
1923 kfree(name);
1924 kfree(otype);
1925
1926 return rc;
1927 }
1928
1929 static int genfs_read(struct policydb *p, void *fp)
1930 {
1931 int i, j, rc;
1932 u32 nel, nel2, len, len2;
1933 __le32 buf[1];
1934 struct ocontext *l, *c;
1935 struct ocontext *newc = NULL;
1936 struct genfs *genfs_p, *genfs;
1937 struct genfs *newgenfs = NULL;
1938
1939 rc = next_entry(buf, fp, sizeof(u32));
1940 if (rc)
1941 goto out;
1942 nel = le32_to_cpu(buf[0]);
1943
1944 for (i = 0; i < nel; i++) {
1945 rc = next_entry(buf, fp, sizeof(u32));
1946 if (rc)
1947 goto out;
1948 len = le32_to_cpu(buf[0]);
1949
1950 rc = -ENOMEM;
1951 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
1952 if (!newgenfs)
1953 goto out;
1954
1955 rc = -ENOMEM;
1956 newgenfs->fstype = kmalloc(len + 1, GFP_KERNEL);
1957 if (!newgenfs->fstype)
1958 goto out;
1959
1960 rc = next_entry(newgenfs->fstype, fp, len);
1961 if (rc)
1962 goto out;
1963
1964 newgenfs->fstype[len] = 0;
1965
1966 for (genfs_p = NULL, genfs = p->genfs; genfs;
1967 genfs_p = genfs, genfs = genfs->next) {
1968 rc = -EINVAL;
1969 if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
1970 printk(KERN_ERR "SELinux: dup genfs fstype %s\n",
1971 newgenfs->fstype);
1972 goto out;
1973 }
1974 if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
1975 break;
1976 }
1977 newgenfs->next = genfs;
1978 if (genfs_p)
1979 genfs_p->next = newgenfs;
1980 else
1981 p->genfs = newgenfs;
1982 genfs = newgenfs;
1983 newgenfs = NULL;
1984
1985 rc = next_entry(buf, fp, sizeof(u32));
1986 if (rc)
1987 goto out;
1988
1989 nel2 = le32_to_cpu(buf[0]);
1990 for (j = 0; j < nel2; j++) {
1991 rc = next_entry(buf, fp, sizeof(u32));
1992 if (rc)
1993 goto out;
1994 len = le32_to_cpu(buf[0]);
1995
1996 rc = -ENOMEM;
1997 newc = kzalloc(sizeof(*newc), GFP_KERNEL);
1998 if (!newc)
1999 goto out;
2000
2001 rc = -ENOMEM;
2002 newc->u.name = kmalloc(len + 1, GFP_KERNEL);
2003 if (!newc->u.name)
2004 goto out;
2005
2006 rc = next_entry(newc->u.name, fp, len);
2007 if (rc)
2008 goto out;
2009 newc->u.name[len] = 0;
2010
2011 rc = next_entry(buf, fp, sizeof(u32));
2012 if (rc)
2013 goto out;
2014
2015 newc->v.sclass = le32_to_cpu(buf[0]);
2016 rc = context_read_and_validate(&newc->context[0], p, fp);
2017 if (rc)
2018 goto out;
2019
2020 for (l = NULL, c = genfs->head; c;
2021 l = c, c = c->next) {
2022 rc = -EINVAL;
2023 if (!strcmp(newc->u.name, c->u.name) &&
2024 (!c->v.sclass || !newc->v.sclass ||
2025 newc->v.sclass == c->v.sclass)) {
2026 printk(KERN_ERR "SELinux: dup genfs entry (%s,%s)\n",
2027 genfs->fstype, c->u.name);
2028 goto out;
2029 }
2030 len = strlen(newc->u.name);
2031 len2 = strlen(c->u.name);
2032 if (len > len2)
2033 break;
2034 }
2035
2036 newc->next = c;
2037 if (l)
2038 l->next = newc;
2039 else
2040 genfs->head = newc;
2041 newc = NULL;
2042 }
2043 }
2044 rc = 0;
2045 out:
2046 if (newgenfs)
2047 kfree(newgenfs->fstype);
2048 kfree(newgenfs);
2049 ocontext_destroy(newc, OCON_FSUSE);
2050
2051 return rc;
2052 }
2053
2054 static int ocontext_read(struct policydb *p, struct policydb_compat_info *info,
2055 void *fp)
2056 {
2057 int i, j, rc;
2058 u32 nel, len;
2059 __le32 buf[3];
2060 struct ocontext *l, *c;
2061 u32 nodebuf[8];
2062
2063 for (i = 0; i < info->ocon_num; i++) {
2064 rc = next_entry(buf, fp, sizeof(u32));
2065 if (rc)
2066 goto out;
2067 nel = le32_to_cpu(buf[0]);
2068
2069 l = NULL;
2070 for (j = 0; j < nel; j++) {
2071 rc = -ENOMEM;
2072 c = kzalloc(sizeof(*c), GFP_KERNEL);
2073 if (!c)
2074 goto out;
2075 if (l)
2076 l->next = c;
2077 else
2078 p->ocontexts[i] = c;
2079 l = c;
2080
2081 switch (i) {
2082 case OCON_ISID:
2083 rc = next_entry(buf, fp, sizeof(u32));
2084 if (rc)
2085 goto out;
2086
2087 c->sid[0] = le32_to_cpu(buf[0]);
2088 rc = context_read_and_validate(&c->context[0], p, fp);
2089 if (rc)
2090 goto out;
2091 break;
2092 case OCON_FS:
2093 case OCON_NETIF:
2094 rc = next_entry(buf, fp, sizeof(u32));
2095 if (rc)
2096 goto out;
2097 len = le32_to_cpu(buf[0]);
2098
2099 rc = -ENOMEM;
2100 c->u.name = kmalloc(len + 1, GFP_KERNEL);
2101 if (!c->u.name)
2102 goto out;
2103
2104 rc = next_entry(c->u.name, fp, len);
2105 if (rc)
2106 goto out;
2107
2108 c->u.name[len] = 0;
2109 rc = context_read_and_validate(&c->context[0], p, fp);
2110 if (rc)
2111 goto out;
2112 rc = context_read_and_validate(&c->context[1], p, fp);
2113 if (rc)
2114 goto out;
2115 break;
2116 case OCON_PORT:
2117 rc = next_entry(buf, fp, sizeof(u32)*3);
2118 if (rc)
2119 goto out;
2120 c->u.port.protocol = le32_to_cpu(buf[0]);
2121 c->u.port.low_port = le32_to_cpu(buf[1]);
2122 c->u.port.high_port = le32_to_cpu(buf[2]);
2123 rc = context_read_and_validate(&c->context[0], p, fp);
2124 if (rc)
2125 goto out;
2126 break;
2127 case OCON_NODE:
2128 rc = next_entry(nodebuf, fp, sizeof(u32) * 2);
2129 if (rc)
2130 goto out;
2131 c->u.node.addr = nodebuf[0]; /* network order */
2132 c->u.node.mask = nodebuf[1]; /* network order */
2133 rc = context_read_and_validate(&c->context[0], p, fp);
2134 if (rc)
2135 goto out;
2136 break;
2137 case OCON_FSUSE:
2138 rc = next_entry(buf, fp, sizeof(u32)*2);
2139 if (rc)
2140 goto out;
2141
2142 rc = -EINVAL;
2143 c->v.behavior = le32_to_cpu(buf[0]);
2144 if (c->v.behavior > SECURITY_FS_USE_NONE)
2145 goto out;
2146
2147 rc = -ENOMEM;
2148 len = le32_to_cpu(buf[1]);
2149 c->u.name = kmalloc(len + 1, GFP_KERNEL);
2150 if (!c->u.name)
2151 goto out;
2152
2153 rc = next_entry(c->u.name, fp, len);
2154 if (rc)
2155 goto out;
2156 c->u.name[len] = 0;
2157 rc = context_read_and_validate(&c->context[0], p, fp);
2158 if (rc)
2159 goto out;
2160 break;
2161 case OCON_NODE6: {
2162 int k;
2163
2164 rc = next_entry(nodebuf, fp, sizeof(u32) * 8);
2165 if (rc)
2166 goto out;
2167 for (k = 0; k < 4; k++)
2168 c->u.node6.addr[k] = nodebuf[k];
2169 for (k = 0; k < 4; k++)
2170 c->u.node6.mask[k] = nodebuf[k+4];
2171 rc = context_read_and_validate(&c->context[0], p, fp);
2172 if (rc)
2173 goto out;
2174 break;
2175 }
2176 }
2177 }
2178 }
2179 rc = 0;
2180 out:
2181 return rc;
2182 }
2183
2184 /*
2185 * Read the configuration data from a policy database binary
2186 * representation file into a policy database structure.
2187 */
2188 int policydb_read(struct policydb *p, void *fp)
2189 {
2190 struct role_allow *ra, *lra;
2191 struct role_trans *tr, *ltr;
2192 int i, j, rc;
2193 __le32 buf[4];
2194 u32 len, nprim, nel;
2195
2196 char *policydb_str;
2197 struct policydb_compat_info *info;
2198
2199 rc = policydb_init(p);
2200 if (rc)
2201 return rc;
2202
2203 /* Read the magic number and string length. */
2204 rc = next_entry(buf, fp, sizeof(u32) * 2);
2205 if (rc)
2206 goto bad;
2207
2208 rc = -EINVAL;
2209 if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
2210 printk(KERN_ERR "SELinux: policydb magic number 0x%x does "
2211 "not match expected magic number 0x%x\n",
2212 le32_to_cpu(buf[0]), POLICYDB_MAGIC);
2213 goto bad;
2214 }
2215
2216 rc = -EINVAL;
2217 len = le32_to_cpu(buf[1]);
2218 if (len != strlen(POLICYDB_STRING)) {
2219 printk(KERN_ERR "SELinux: policydb string length %d does not "
2220 "match expected length %Zu\n",
2221 len, strlen(POLICYDB_STRING));
2222 goto bad;
2223 }
2224
2225 rc = -ENOMEM;
2226 policydb_str = kmalloc(len + 1, GFP_KERNEL);
2227 if (!policydb_str) {
2228 printk(KERN_ERR "SELinux: unable to allocate memory for policydb "
2229 "string of length %d\n", len);
2230 goto bad;
2231 }
2232
2233 rc = next_entry(policydb_str, fp, len);
2234 if (rc) {
2235 printk(KERN_ERR "SELinux: truncated policydb string identifier\n");
2236 kfree(policydb_str);
2237 goto bad;
2238 }
2239
2240 rc = -EINVAL;
2241 policydb_str[len] = '\0';
2242 if (strcmp(policydb_str, POLICYDB_STRING)) {
2243 printk(KERN_ERR "SELinux: policydb string %s does not match "
2244 "my string %s\n", policydb_str, POLICYDB_STRING);
2245 kfree(policydb_str);
2246 goto bad;
2247 }
2248 /* Done with policydb_str. */
2249 kfree(policydb_str);
2250 policydb_str = NULL;
2251
2252 /* Read the version and table sizes. */
2253 rc = next_entry(buf, fp, sizeof(u32)*4);
2254 if (rc)
2255 goto bad;
2256
2257 rc = -EINVAL;
2258 p->policyvers = le32_to_cpu(buf[0]);
2259 if (p->policyvers < POLICYDB_VERSION_MIN ||
2260 p->policyvers > POLICYDB_VERSION_MAX) {
2261 printk(KERN_ERR "SELinux: policydb version %d does not match "
2262 "my version range %d-%d\n",
2263 le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
2264 goto bad;
2265 }
2266
2267 if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
2268 p->mls_enabled = 1;
2269
2270 rc = -EINVAL;
2271 if (p->policyvers < POLICYDB_VERSION_MLS) {
2272 printk(KERN_ERR "SELinux: security policydb version %d "
2273 "(MLS) not backwards compatible\n",
2274 p->policyvers);
2275 goto bad;
2276 }
2277 }
2278 p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
2279 p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
2280
2281 if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
2282 rc = ebitmap_read(&p->policycaps, fp);
2283 if (rc)
2284 goto bad;
2285 }
2286
2287 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
2288 rc = ebitmap_read(&p->permissive_map, fp);
2289 if (rc)
2290 goto bad;
2291 }
2292
2293 rc = -EINVAL;
2294 info = policydb_lookup_compat(p->policyvers);
2295 if (!info) {
2296 printk(KERN_ERR "SELinux: unable to find policy compat info "
2297 "for version %d\n", p->policyvers);
2298 goto bad;
2299 }
2300
2301 rc = -EINVAL;
2302 if (le32_to_cpu(buf[2]) != info->sym_num ||
2303 le32_to_cpu(buf[3]) != info->ocon_num) {
2304 printk(KERN_ERR "SELinux: policydb table sizes (%d,%d) do "
2305 "not match mine (%d,%d)\n", le32_to_cpu(buf[2]),
2306 le32_to_cpu(buf[3]),
2307 info->sym_num, info->ocon_num);
2308 goto bad;
2309 }
2310
2311 for (i = 0; i < info->sym_num; i++) {
2312 rc = next_entry(buf, fp, sizeof(u32)*2);
2313 if (rc)
2314 goto bad;
2315 nprim = le32_to_cpu(buf[0]);
2316 nel = le32_to_cpu(buf[1]);
2317 for (j = 0; j < nel; j++) {
2318 rc = read_f[i](p, p->symtab[i].table, fp);
2319 if (rc)
2320 goto bad;
2321 }
2322
2323 p->symtab[i].nprim = nprim;
2324 }
2325
2326 rc = -EINVAL;
2327 p->process_class = string_to_security_class(p, "process");
2328 if (!p->process_class)
2329 goto bad;
2330
2331 rc = avtab_read(&p->te_avtab, fp, p);
2332 if (rc)
2333 goto bad;
2334
2335 if (p->policyvers >= POLICYDB_VERSION_BOOL) {
2336 rc = cond_read_list(p, fp);
2337 if (rc)
2338 goto bad;
2339 }
2340
2341 rc = next_entry(buf, fp, sizeof(u32));
2342 if (rc)
2343 goto bad;
2344 nel = le32_to_cpu(buf[0]);
2345 ltr = NULL;
2346 for (i = 0; i < nel; i++) {
2347 rc = -ENOMEM;
2348 tr = kzalloc(sizeof(*tr), GFP_KERNEL);
2349 if (!tr)
2350 goto bad;
2351 if (ltr)
2352 ltr->next = tr;
2353 else
2354 p->role_tr = tr;
2355 rc = next_entry(buf, fp, sizeof(u32)*3);
2356 if (rc)
2357 goto bad;
2358
2359 rc = -EINVAL;
2360 tr->role = le32_to_cpu(buf[0]);
2361 tr->type = le32_to_cpu(buf[1]);
2362 tr->new_role = le32_to_cpu(buf[2]);
2363 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2364 rc = next_entry(buf, fp, sizeof(u32));
2365 if (rc)
2366 goto bad;
2367 tr->tclass = le32_to_cpu(buf[0]);
2368 } else
2369 tr->tclass = p->process_class;
2370
2371 if (!policydb_role_isvalid(p, tr->role) ||
2372 !policydb_type_isvalid(p, tr->type) ||
2373 !policydb_class_isvalid(p, tr->tclass) ||
2374 !policydb_role_isvalid(p, tr->new_role))
2375 goto bad;
2376 ltr = tr;
2377 }
2378
2379 rc = next_entry(buf, fp, sizeof(u32));
2380 if (rc)
2381 goto bad;
2382 nel = le32_to_cpu(buf[0]);
2383 lra = NULL;
2384 for (i = 0; i < nel; i++) {
2385 rc = -ENOMEM;
2386 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
2387 if (!ra)
2388 goto bad;
2389 if (lra)
2390 lra->next = ra;
2391 else
2392 p->role_allow = ra;
2393 rc = next_entry(buf, fp, sizeof(u32)*2);
2394 if (rc)
2395 goto bad;
2396
2397 rc = -EINVAL;
2398 ra->role = le32_to_cpu(buf[0]);
2399 ra->new_role = le32_to_cpu(buf[1]);
2400 if (!policydb_role_isvalid(p, ra->role) ||
2401 !policydb_role_isvalid(p, ra->new_role))
2402 goto bad;
2403 lra = ra;
2404 }
2405
2406 rc = filename_trans_read(p, fp);
2407 if (rc)
2408 goto bad;
2409
2410 rc = policydb_index(p);
2411 if (rc)
2412 goto bad;
2413
2414 rc = -EINVAL;
2415 p->process_trans_perms = string_to_av_perm(p, p->process_class, "transition");
2416 p->process_trans_perms |= string_to_av_perm(p, p->process_class, "dyntransition");
2417 if (!p->process_trans_perms)
2418 goto bad;
2419
2420 rc = ocontext_read(p, info, fp);
2421 if (rc)
2422 goto bad;
2423
2424 rc = genfs_read(p, fp);
2425 if (rc)
2426 goto bad;
2427
2428 rc = range_read(p, fp);
2429 if (rc)
2430 goto bad;
2431
2432 rc = -ENOMEM;
2433 p->type_attr_map_array = flex_array_alloc(sizeof(struct ebitmap),
2434 p->p_types.nprim,
2435 GFP_KERNEL | __GFP_ZERO);
2436 if (!p->type_attr_map_array)
2437 goto bad;
2438
2439 /* preallocate so we don't have to worry about the put ever failing */
2440 rc = flex_array_prealloc(p->type_attr_map_array, 0, p->p_types.nprim,
2441 GFP_KERNEL | __GFP_ZERO);
2442 if (rc)
2443 goto bad;
2444
2445 for (i = 0; i < p->p_types.nprim; i++) {
2446 struct ebitmap *e = flex_array_get(p->type_attr_map_array, i);
2447
2448 BUG_ON(!e);
2449 ebitmap_init(e);
2450 if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
2451 rc = ebitmap_read(e, fp);
2452 if (rc)
2453 goto bad;
2454 }
2455 /* add the type itself as the degenerate case */
2456 rc = ebitmap_set_bit(e, i, 1);
2457 if (rc)
2458 goto bad;
2459 }
2460
2461 rc = policydb_bounds_sanity_check(p);
2462 if (rc)
2463 goto bad;
2464
2465 rc = 0;
2466 out:
2467 return rc;
2468 bad:
2469 policydb_destroy(p);
2470 goto out;
2471 }
2472
2473 /*
2474 * Write a MLS level structure to a policydb binary
2475 * representation file.
2476 */
2477 static int mls_write_level(struct mls_level *l, void *fp)
2478 {
2479 __le32 buf[1];
2480 int rc;
2481
2482 buf[0] = cpu_to_le32(l->sens);
2483 rc = put_entry(buf, sizeof(u32), 1, fp);
2484 if (rc)
2485 return rc;
2486
2487 rc = ebitmap_write(&l->cat, fp);
2488 if (rc)
2489 return rc;
2490
2491 return 0;
2492 }
2493
2494 /*
2495 * Write a MLS range structure to a policydb binary
2496 * representation file.
2497 */
2498 static int mls_write_range_helper(struct mls_range *r, void *fp)
2499 {
2500 __le32 buf[3];
2501 size_t items;
2502 int rc, eq;
2503
2504 eq = mls_level_eq(&r->level[1], &r->level[0]);
2505
2506 if (eq)
2507 items = 2;
2508 else
2509 items = 3;
2510 buf[0] = cpu_to_le32(items-1);
2511 buf[1] = cpu_to_le32(r->level[0].sens);
2512 if (!eq)
2513 buf[2] = cpu_to_le32(r->level[1].sens);
2514
2515 BUG_ON(items > (sizeof(buf)/sizeof(buf[0])));
2516
2517 rc = put_entry(buf, sizeof(u32), items, fp);
2518 if (rc)
2519 return rc;
2520
2521 rc = ebitmap_write(&r->level[0].cat, fp);
2522 if (rc)
2523 return rc;
2524 if (!eq) {
2525 rc = ebitmap_write(&r->level[1].cat, fp);
2526 if (rc)
2527 return rc;
2528 }
2529
2530 return 0;
2531 }
2532
2533 static int sens_write(void *vkey, void *datum, void *ptr)
2534 {
2535 char *key = vkey;
2536 struct level_datum *levdatum = datum;
2537 struct policy_data *pd = ptr;
2538 void *fp = pd->fp;
2539 __le32 buf[2];
2540 size_t len;
2541 int rc;
2542
2543 len = strlen(key);
2544 buf[0] = cpu_to_le32(len);
2545 buf[1] = cpu_to_le32(levdatum->isalias);
2546 rc = put_entry(buf, sizeof(u32), 2, fp);
2547 if (rc)
2548 return rc;
2549
2550 rc = put_entry(key, 1, len, fp);
2551 if (rc)
2552 return rc;
2553
2554 rc = mls_write_level(levdatum->level, fp);
2555 if (rc)
2556 return rc;
2557
2558 return 0;
2559 }
2560
2561 static int cat_write(void *vkey, void *datum, void *ptr)
2562 {
2563 char *key = vkey;
2564 struct cat_datum *catdatum = datum;
2565 struct policy_data *pd = ptr;
2566 void *fp = pd->fp;
2567 __le32 buf[3];
2568 size_t len;
2569 int rc;
2570
2571 len = strlen(key);
2572 buf[0] = cpu_to_le32(len);
2573 buf[1] = cpu_to_le32(catdatum->value);
2574 buf[2] = cpu_to_le32(catdatum->isalias);
2575 rc = put_entry(buf, sizeof(u32), 3, fp);
2576 if (rc)
2577 return rc;
2578
2579 rc = put_entry(key, 1, len, fp);
2580 if (rc)
2581 return rc;
2582
2583 return 0;
2584 }
2585
2586 static int role_trans_write(struct policydb *p, void *fp)
2587 {
2588 struct role_trans *r = p->role_tr;
2589 struct role_trans *tr;
2590 u32 buf[3];
2591 size_t nel;
2592 int rc;
2593
2594 nel = 0;
2595 for (tr = r; tr; tr = tr->next)
2596 nel++;
2597 buf[0] = cpu_to_le32(nel);
2598 rc = put_entry(buf, sizeof(u32), 1, fp);
2599 if (rc)
2600 return rc;
2601 for (tr = r; tr; tr = tr->next) {
2602 buf[0] = cpu_to_le32(tr->role);
2603 buf[1] = cpu_to_le32(tr->type);
2604 buf[2] = cpu_to_le32(tr->new_role);
2605 rc = put_entry(buf, sizeof(u32), 3, fp);
2606 if (rc)
2607 return rc;
2608 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2609 buf[0] = cpu_to_le32(tr->tclass);
2610 rc = put_entry(buf, sizeof(u32), 1, fp);
2611 if (rc)
2612 return rc;
2613 }
2614 }
2615
2616 return 0;
2617 }
2618
2619 static int role_allow_write(struct role_allow *r, void *fp)
2620 {
2621 struct role_allow *ra;
2622 u32 buf[2];
2623 size_t nel;
2624 int rc;
2625
2626 nel = 0;
2627 for (ra = r; ra; ra = ra->next)
2628 nel++;
2629 buf[0] = cpu_to_le32(nel);
2630 rc = put_entry(buf, sizeof(u32), 1, fp);
2631 if (rc)
2632 return rc;
2633 for (ra = r; ra; ra = ra->next) {
2634 buf[0] = cpu_to_le32(ra->role);
2635 buf[1] = cpu_to_le32(ra->new_role);
2636 rc = put_entry(buf, sizeof(u32), 2, fp);
2637 if (rc)
2638 return rc;
2639 }
2640 return 0;
2641 }
2642
2643 /*
2644 * Write a security context structure
2645 * to a policydb binary representation file.
2646 */
2647 static int context_write(struct policydb *p, struct context *c,
2648 void *fp)
2649 {
2650 int rc;
2651 __le32 buf[3];
2652
2653 buf[0] = cpu_to_le32(c->user);
2654 buf[1] = cpu_to_le32(c->role);
2655 buf[2] = cpu_to_le32(c->type);
2656
2657 rc = put_entry(buf, sizeof(u32), 3, fp);
2658 if (rc)
2659 return rc;
2660
2661 rc = mls_write_range_helper(&c->range, fp);
2662 if (rc)
2663 return rc;
2664
2665 return 0;
2666 }
2667
2668 /*
2669 * The following *_write functions are used to
2670 * write the symbol data to a policy database
2671 * binary representation file.
2672 */
2673
2674 static int perm_write(void *vkey, void *datum, void *fp)
2675 {
2676 char *key = vkey;
2677 struct perm_datum *perdatum = datum;
2678 __le32 buf[2];
2679 size_t len;
2680 int rc;
2681
2682 len = strlen(key);
2683 buf[0] = cpu_to_le32(len);
2684 buf[1] = cpu_to_le32(perdatum->value);
2685 rc = put_entry(buf, sizeof(u32), 2, fp);
2686 if (rc)
2687 return rc;
2688
2689 rc = put_entry(key, 1, len, fp);
2690 if (rc)
2691 return rc;
2692
2693 return 0;
2694 }
2695
2696 static int common_write(void *vkey, void *datum, void *ptr)
2697 {
2698 char *key = vkey;
2699 struct common_datum *comdatum = datum;
2700 struct policy_data *pd = ptr;
2701 void *fp = pd->fp;
2702 __le32 buf[4];
2703 size_t len;
2704 int rc;
2705
2706 len = strlen(key);
2707 buf[0] = cpu_to_le32(len);
2708 buf[1] = cpu_to_le32(comdatum->value);
2709 buf[2] = cpu_to_le32(comdatum->permissions.nprim);
2710 buf[3] = cpu_to_le32(comdatum->permissions.table->nel);
2711 rc = put_entry(buf, sizeof(u32), 4, fp);
2712 if (rc)
2713 return rc;
2714
2715 rc = put_entry(key, 1, len, fp);
2716 if (rc)
2717 return rc;
2718
2719 rc = hashtab_map(comdatum->permissions.table, perm_write, fp);
2720 if (rc)
2721 return rc;
2722
2723 return 0;
2724 }
2725
2726 static int write_cons_helper(struct policydb *p, struct constraint_node *node,
2727 void *fp)
2728 {
2729 struct constraint_node *c;
2730 struct constraint_expr *e;
2731 __le32 buf[3];
2732 u32 nel;
2733 int rc;
2734
2735 for (c = node; c; c = c->next) {
2736 nel = 0;
2737 for (e = c->expr; e; e = e->next)
2738 nel++;
2739 buf[0] = cpu_to_le32(c->permissions);
2740 buf[1] = cpu_to_le32(nel);
2741 rc = put_entry(buf, sizeof(u32), 2, fp);
2742 if (rc)
2743 return rc;
2744 for (e = c->expr; e; e = e->next) {
2745 buf[0] = cpu_to_le32(e->expr_type);
2746 buf[1] = cpu_to_le32(e->attr);
2747 buf[2] = cpu_to_le32(e->op);
2748 rc = put_entry(buf, sizeof(u32), 3, fp);
2749 if (rc)
2750 return rc;
2751
2752 switch (e->expr_type) {
2753 case CEXPR_NAMES:
2754 rc = ebitmap_write(&e->names, fp);
2755 if (rc)
2756 return rc;
2757 break;
2758 default:
2759 break;
2760 }
2761 }
2762 }
2763
2764 return 0;
2765 }
2766
2767 static int class_write(void *vkey, void *datum, void *ptr)
2768 {
2769 char *key = vkey;
2770 struct class_datum *cladatum = datum;
2771 struct policy_data *pd = ptr;
2772 void *fp = pd->fp;
2773 struct policydb *p = pd->p;
2774 struct constraint_node *c;
2775 __le32 buf[6];
2776 u32 ncons;
2777 size_t len, len2;
2778 int rc;
2779
2780 len = strlen(key);
2781 if (cladatum->comkey)
2782 len2 = strlen(cladatum->comkey);
2783 else
2784 len2 = 0;
2785
2786 ncons = 0;
2787 for (c = cladatum->constraints; c; c = c->next)
2788 ncons++;
2789
2790 buf[0] = cpu_to_le32(len);
2791 buf[1] = cpu_to_le32(len2);
2792 buf[2] = cpu_to_le32(cladatum->value);
2793 buf[3] = cpu_to_le32(cladatum->permissions.nprim);
2794 if (cladatum->permissions.table)
2795 buf[4] = cpu_to_le32(cladatum->permissions.table->nel);
2796 else
2797 buf[4] = 0;
2798 buf[5] = cpu_to_le32(ncons);
2799 rc = put_entry(buf, sizeof(u32), 6, fp);
2800 if (rc)
2801 return rc;
2802
2803 rc = put_entry(key, 1, len, fp);
2804 if (rc)
2805 return rc;
2806
2807 if (cladatum->comkey) {
2808 rc = put_entry(cladatum->comkey, 1, len2, fp);
2809 if (rc)
2810 return rc;
2811 }
2812
2813 rc = hashtab_map(cladatum->permissions.table, perm_write, fp);
2814 if (rc)
2815 return rc;
2816
2817 rc = write_cons_helper(p, cladatum->constraints, fp);
2818 if (rc)
2819 return rc;
2820
2821 /* write out the validatetrans rule */
2822 ncons = 0;
2823 for (c = cladatum->validatetrans; c; c = c->next)
2824 ncons++;
2825
2826 buf[0] = cpu_to_le32(ncons);
2827 rc = put_entry(buf, sizeof(u32), 1, fp);
2828 if (rc)
2829 return rc;
2830
2831 rc = write_cons_helper(p, cladatum->validatetrans, fp);
2832 if (rc)
2833 return rc;
2834
2835 return 0;
2836 }
2837
2838 static int role_write(void *vkey, void *datum, void *ptr)
2839 {
2840 char *key = vkey;
2841 struct role_datum *role = datum;
2842 struct policy_data *pd = ptr;
2843 void *fp = pd->fp;
2844 struct policydb *p = pd->p;
2845 __le32 buf[3];
2846 size_t items, len;
2847 int rc;
2848
2849 len = strlen(key);
2850 items = 0;
2851 buf[items++] = cpu_to_le32(len);
2852 buf[items++] = cpu_to_le32(role->value);
2853 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
2854 buf[items++] = cpu_to_le32(role->bounds);
2855
2856 BUG_ON(items > (sizeof(buf)/sizeof(buf[0])));
2857
2858 rc = put_entry(buf, sizeof(u32), items, fp);
2859 if (rc)
2860 return rc;
2861
2862 rc = put_entry(key, 1, len, fp);
2863 if (rc)
2864 return rc;
2865
2866 rc = ebitmap_write(&role->dominates, fp);
2867 if (rc)
2868 return rc;
2869
2870 rc = ebitmap_write(&role->types, fp);
2871 if (rc)
2872 return rc;
2873
2874 return 0;
2875 }
2876
2877 static int type_write(void *vkey, void *datum, void *ptr)
2878 {
2879 char *key = vkey;
2880 struct type_datum *typdatum = datum;
2881 struct policy_data *pd = ptr;
2882 struct policydb *p = pd->p;
2883 void *fp = pd->fp;
2884 __le32 buf[4];
2885 int rc;
2886 size_t items, len;
2887
2888 len = strlen(key);
2889 items = 0;
2890 buf[items++] = cpu_to_le32(len);
2891 buf[items++] = cpu_to_le32(typdatum->value);
2892 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
2893 u32 properties = 0;
2894
2895 if (typdatum->primary)
2896 properties |= TYPEDATUM_PROPERTY_PRIMARY;
2897
2898 if (typdatum->attribute)
2899 properties |= TYPEDATUM_PROPERTY_ATTRIBUTE;
2900
2901 buf[items++] = cpu_to_le32(properties);
2902 buf[items++] = cpu_to_le32(typdatum->bounds);
2903 } else {
2904 buf[items++] = cpu_to_le32(typdatum->primary);
2905 }
2906 BUG_ON(items > (sizeof(buf) / sizeof(buf[0])));
2907 rc = put_entry(buf, sizeof(u32), items, fp);
2908 if (rc)
2909 return rc;
2910
2911 rc = put_entry(key, 1, len, fp);
2912 if (rc)
2913 return rc;
2914
2915 return 0;
2916 }
2917
2918 static int user_write(void *vkey, void *datum, void *ptr)
2919 {
2920 char *key = vkey;
2921 struct user_datum *usrdatum = datum;
2922 struct policy_data *pd = ptr;
2923 struct policydb *p = pd->p;
2924 void *fp = pd->fp;
2925 __le32 buf[3];
2926 size_t items, len;
2927 int rc;
2928
2929 len = strlen(key);
2930 items = 0;
2931 buf[items++] = cpu_to_le32(len);
2932 buf[items++] = cpu_to_le32(usrdatum->value);
2933 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
2934 buf[items++] = cpu_to_le32(usrdatum->bounds);
2935 BUG_ON(items > (sizeof(buf) / sizeof(buf[0])));
2936 rc = put_entry(buf, sizeof(u32), items, fp);
2937 if (rc)
2938 return rc;
2939
2940 rc = put_entry(key, 1, len, fp);
2941 if (rc)
2942 return rc;
2943
2944 rc = ebitmap_write(&usrdatum->roles, fp);
2945 if (rc)
2946 return rc;
2947
2948 rc = mls_write_range_helper(&usrdatum->range, fp);
2949 if (rc)
2950 return rc;
2951
2952 rc = mls_write_level(&usrdatum->dfltlevel, fp);
2953 if (rc)
2954 return rc;
2955
2956 return 0;
2957 }
2958
2959 static int (*write_f[SYM_NUM]) (void *key, void *datum,
2960 void *datap) =
2961 {
2962 common_write,
2963 class_write,
2964 role_write,
2965 type_write,
2966 user_write,
2967 cond_write_bool,
2968 sens_write,
2969 cat_write,
2970 };
2971
2972 static int ocontext_write(struct policydb *p, struct policydb_compat_info *info,
2973 void *fp)
2974 {
2975 unsigned int i, j, rc;
2976 size_t nel, len;
2977 __le32 buf[3];
2978 u32 nodebuf[8];
2979 struct ocontext *c;
2980 for (i = 0; i < info->ocon_num; i++) {
2981 nel = 0;
2982 for (c = p->ocontexts[i]; c; c = c->next)
2983 nel++;
2984 buf[0] = cpu_to_le32(nel);
2985 rc = put_entry(buf, sizeof(u32), 1, fp);
2986 if (rc)
2987 return rc;
2988 for (c = p->ocontexts[i]; c; c = c->next) {
2989 switch (i) {
2990 case OCON_ISID:
2991 buf[0] = cpu_to_le32(c->sid[0]);
2992 rc = put_entry(buf, sizeof(u32), 1, fp);
2993 if (rc)
2994 return rc;
2995 rc = context_write(p, &c->context[0], fp);
2996 if (rc)
2997 return rc;
2998 break;
2999 case OCON_FS:
3000 case OCON_NETIF:
3001 len = strlen(c->u.name);
3002 buf[0] = cpu_to_le32(len);
3003 rc = put_entry(buf, sizeof(u32), 1, fp);
3004 if (rc)
3005 return rc;
3006 rc = put_entry(c->u.name, 1, len, fp);
3007 if (rc)
3008 return rc;
3009 rc = context_write(p, &c->context[0], fp);
3010 if (rc)
3011 return rc;
3012 rc = context_write(p, &c->context[1], fp);
3013 if (rc)
3014 return rc;
3015 break;
3016 case OCON_PORT:
3017 buf[0] = cpu_to_le32(c->u.port.protocol);
3018 buf[1] = cpu_to_le32(c->u.port.low_port);
3019 buf[2] = cpu_to_le32(c->u.port.high_port);
3020 rc = put_entry(buf, sizeof(u32), 3, fp);
3021 if (rc)
3022 return rc;
3023 rc = context_write(p, &c->context[0], fp);
3024 if (rc)
3025 return rc;
3026 break;
3027 case OCON_NODE:
3028 nodebuf[0] = c->u.node.addr; /* network order */
3029 nodebuf[1] = c->u.node.mask; /* network order */
3030 rc = put_entry(nodebuf, sizeof(u32), 2, fp);
3031 if (rc)
3032 return rc;
3033 rc = context_write(p, &c->context[0], fp);
3034 if (rc)
3035 return rc;
3036 break;
3037 case OCON_FSUSE:
3038 buf[0] = cpu_to_le32(c->v.behavior);
3039 len = strlen(c->u.name);
3040 buf[1] = cpu_to_le32(len);
3041 rc = put_entry(buf, sizeof(u32), 2, fp);
3042 if (rc)
3043 return rc;
3044 rc = put_entry(c->u.name, 1, len, fp);
3045 if (rc)
3046 return rc;
3047 rc = context_write(p, &c->context[0], fp);
3048 if (rc)
3049 return rc;
3050 break;
3051 case OCON_NODE6:
3052 for (j = 0; j < 4; j++)
3053 nodebuf[j] = c->u.node6.addr[j]; /* network order */
3054 for (j = 0; j < 4; j++)
3055 nodebuf[j + 4] = c->u.node6.mask[j]; /* network order */
3056 rc = put_entry(nodebuf, sizeof(u32), 8, fp);
3057 if (rc)
3058 return rc;
3059 rc = context_write(p, &c->context[0], fp);
3060 if (rc)
3061 return rc;
3062 break;
3063 }
3064 }
3065 }
3066 return 0;
3067 }
3068
3069 static int genfs_write(struct policydb *p, void *fp)
3070 {
3071 struct genfs *genfs;
3072 struct ocontext *c;
3073 size_t len;
3074 __le32 buf[1];
3075 int rc;
3076
3077 len = 0;
3078 for (genfs = p->genfs; genfs; genfs = genfs->next)
3079 len++;
3080 buf[0] = cpu_to_le32(len);
3081 rc = put_entry(buf, sizeof(u32), 1, fp);
3082 if (rc)
3083 return rc;
3084 for (genfs = p->genfs; genfs; genfs = genfs->next) {
3085 len = strlen(genfs->fstype);
3086 buf[0] = cpu_to_le32(len);
3087 rc = put_entry(buf, sizeof(u32), 1, fp);
3088 if (rc)
3089 return rc;
3090 rc = put_entry(genfs->fstype, 1, len, fp);
3091 if (rc)
3092 return rc;
3093 len = 0;
3094 for (c = genfs->head; c; c = c->next)
3095 len++;
3096 buf[0] = cpu_to_le32(len);
3097 rc = put_entry(buf, sizeof(u32), 1, fp);
3098 if (rc)
3099 return rc;
3100 for (c = genfs->head; c; c = c->next) {
3101 len = strlen(c->u.name);
3102 buf[0] = cpu_to_le32(len);
3103 rc = put_entry(buf, sizeof(u32), 1, fp);
3104 if (rc)
3105 return rc;
3106 rc = put_entry(c->u.name, 1, len, fp);
3107 if (rc)
3108 return rc;
3109 buf[0] = cpu_to_le32(c->v.sclass);
3110 rc = put_entry(buf, sizeof(u32), 1, fp);
3111 if (rc)
3112 return rc;
3113 rc = context_write(p, &c->context[0], fp);
3114 if (rc)
3115 return rc;
3116 }
3117 }
3118 return 0;
3119 }
3120
3121 static int hashtab_cnt(void *key, void *data, void *ptr)
3122 {
3123 int *cnt = ptr;
3124 *cnt = *cnt + 1;
3125
3126 return 0;
3127 }
3128
3129 static int range_write_helper(void *key, void *data, void *ptr)
3130 {
3131 __le32 buf[2];
3132 struct range_trans *rt = key;
3133 struct mls_range *r = data;
3134 struct policy_data *pd = ptr;
3135 void *fp = pd->fp;
3136 struct policydb *p = pd->p;
3137 int rc;
3138
3139 buf[0] = cpu_to_le32(rt->source_type);
3140 buf[1] = cpu_to_le32(rt->target_type);
3141 rc = put_entry(buf, sizeof(u32), 2, fp);
3142 if (rc)
3143 return rc;
3144 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
3145 buf[0] = cpu_to_le32(rt->target_class);
3146 rc = put_entry(buf, sizeof(u32), 1, fp);
3147 if (rc)
3148 return rc;
3149 }
3150 rc = mls_write_range_helper(r, fp);
3151 if (rc)
3152 return rc;
3153
3154 return 0;
3155 }
3156
3157 static int range_write(struct policydb *p, void *fp)
3158 {
3159 size_t nel;
3160 __le32 buf[1];
3161 int rc;
3162 struct policy_data pd;
3163
3164 pd.p = p;
3165 pd.fp = fp;
3166
3167 /* count the number of entries in the hashtab */
3168 nel = 0;
3169 rc = hashtab_map(p->range_tr, hashtab_cnt, &nel);
3170 if (rc)
3171 return rc;
3172
3173 buf[0] = cpu_to_le32(nel);
3174 rc = put_entry(buf, sizeof(u32), 1, fp);
3175 if (rc)
3176 return rc;
3177
3178 /* actually write all of the entries */
3179 rc = hashtab_map(p->range_tr, range_write_helper, &pd);
3180 if (rc)
3181 return rc;
3182
3183 return 0;
3184 }
3185
3186 static int filename_write_helper(void *key, void *data, void *ptr)
3187 {
3188 __le32 buf[4];
3189 struct filename_trans *ft = key;
3190 struct filename_trans_datum *otype = data;
3191 void *fp = ptr;
3192 int rc;
3193 u32 len;
3194
3195 len = strlen(ft->name);
3196 buf[0] = cpu_to_le32(len);
3197 rc = put_entry(buf, sizeof(u32), 1, fp);
3198 if (rc)
3199 return rc;
3200
3201 rc = put_entry(ft->name, sizeof(char), len, fp);
3202 if (rc)
3203 return rc;
3204
3205 buf[0] = ft->stype;
3206 buf[1] = ft->ttype;
3207 buf[2] = ft->tclass;
3208 buf[3] = otype->otype;
3209
3210 rc = put_entry(buf, sizeof(u32), 4, fp);
3211 if (rc)
3212 return rc;
3213
3214 return 0;
3215 }
3216
3217 static int filename_trans_write(struct policydb *p, void *fp)
3218 {
3219 u32 nel;
3220 __le32 buf[1];
3221 int rc;
3222
3223 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
3224 return 0;
3225
3226 nel = 0;
3227 rc = hashtab_map(p->filename_trans, hashtab_cnt, &nel);
3228 if (rc)
3229 return rc;
3230
3231 buf[0] = cpu_to_le32(nel);
3232 rc = put_entry(buf, sizeof(u32), 1, fp);
3233 if (rc)
3234 return rc;
3235
3236 rc = hashtab_map(p->filename_trans, filename_write_helper, fp);
3237 if (rc)
3238 return rc;
3239
3240 return 0;
3241 }
3242
3243 /*
3244 * Write the configuration data in a policy database
3245 * structure to a policy database binary representation
3246 * file.
3247 */
3248 int policydb_write(struct policydb *p, void *fp)
3249 {
3250 unsigned int i, num_syms;
3251 int rc;
3252 __le32 buf[4];
3253 u32 config;
3254 size_t len;
3255 struct policydb_compat_info *info;
3256
3257 /*
3258 * refuse to write policy older than compressed avtab
3259 * to simplify the writer. There are other tests dropped
3260 * since we assume this throughout the writer code. Be
3261 * careful if you ever try to remove this restriction
3262 */
3263 if (p->policyvers < POLICYDB_VERSION_AVTAB) {
3264 printk(KERN_ERR "SELinux: refusing to write policy version %d."
3265 " Because it is less than version %d\n", p->policyvers,
3266 POLICYDB_VERSION_AVTAB);
3267 return -EINVAL;
3268 }
3269
3270 config = 0;
3271 if (p->mls_enabled)
3272 config |= POLICYDB_CONFIG_MLS;
3273
3274 if (p->reject_unknown)
3275 config |= REJECT_UNKNOWN;
3276 if (p->allow_unknown)
3277 config |= ALLOW_UNKNOWN;
3278
3279 /* Write the magic number and string identifiers. */
3280 buf[0] = cpu_to_le32(POLICYDB_MAGIC);
3281 len = strlen(POLICYDB_STRING);
3282 buf[1] = cpu_to_le32(len);
3283 rc = put_entry(buf, sizeof(u32), 2, fp);
3284 if (rc)
3285 return rc;
3286 rc = put_entry(POLICYDB_STRING, 1, len, fp);
3287 if (rc)
3288 return rc;
3289
3290 /* Write the version, config, and table sizes. */
3291 info = policydb_lookup_compat(p->policyvers);
3292 if (!info) {
3293 printk(KERN_ERR "SELinux: compatibility lookup failed for policy "
3294 "version %d", p->policyvers);
3295 return -EINVAL;
3296 }
3297
3298 buf[0] = cpu_to_le32(p->policyvers);
3299 buf[1] = cpu_to_le32(config);
3300 buf[2] = cpu_to_le32(info->sym_num);
3301 buf[3] = cpu_to_le32(info->ocon_num);
3302
3303 rc = put_entry(buf, sizeof(u32), 4, fp);
3304 if (rc)
3305 return rc;
3306
3307 if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
3308 rc = ebitmap_write(&p->policycaps, fp);
3309 if (rc)
3310 return rc;
3311 }
3312
3313 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
3314 rc = ebitmap_write(&p->permissive_map, fp);
3315 if (rc)
3316 return rc;
3317 }
3318
3319 num_syms = info->sym_num;
3320 for (i = 0; i < num_syms; i++) {
3321 struct policy_data pd;
3322
3323 pd.fp = fp;
3324 pd.p = p;
3325
3326 buf[0] = cpu_to_le32(p->symtab[i].nprim);
3327 buf[1] = cpu_to_le32(p->symtab[i].table->nel);
3328
3329 rc = put_entry(buf, sizeof(u32), 2, fp);
3330 if (rc)
3331 return rc;
3332 rc = hashtab_map(p->symtab[i].table, write_f[i], &pd);
3333 if (rc)
3334 return rc;
3335 }
3336
3337 rc = avtab_write(p, &p->te_avtab, fp);
3338 if (rc)
3339 return rc;
3340
3341 rc = cond_write_list(p, p->cond_list, fp);
3342 if (rc)
3343 return rc;
3344
3345 rc = role_trans_write(p, fp);
3346 if (rc)
3347 return rc;
3348
3349 rc = role_allow_write(p->role_allow, fp);
3350 if (rc)
3351 return rc;
3352
3353 rc = filename_trans_write(p, fp);
3354 if (rc)
3355 return rc;
3356
3357 rc = ocontext_write(p, info, fp);
3358 if (rc)
3359 return rc;
3360
3361 rc = genfs_write(p, fp);
3362 if (rc)
3363 return rc;
3364
3365 rc = range_write(p, fp);
3366 if (rc)
3367 return rc;
3368
3369 for (i = 0; i < p->p_types.nprim; i++) {
3370 struct ebitmap *e = flex_array_get(p->type_attr_map_array, i);
3371
3372 BUG_ON(!e);
3373 rc = ebitmap_write(e, fp);
3374 if (rc)
3375 return rc;
3376 }
3377
3378 return 0;
3379 }
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