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