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