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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 if (levdatum->level)
734 ebitmap_destroy(&levdatum->level->cat);
735 kfree(levdatum->level);
736 }
737 kfree(datum);
738 return 0;
739 }
740
741 static int cat_destroy(void *key, void *datum, void *p)
742 {
743 kfree(key);
744 kfree(datum);
745 return 0;
746 }
747
748 static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) =
749 {
750 common_destroy,
751 cls_destroy,
752 role_destroy,
753 type_destroy,
754 user_destroy,
755 cond_destroy_bool,
756 sens_destroy,
757 cat_destroy,
758 };
759
760 static int filenametr_destroy(void *key, void *datum, void *p)
761 {
762 struct filename_trans *ft = key;
763 kfree(ft->name);
764 kfree(key);
765 kfree(datum);
766 cond_resched();
767 return 0;
768 }
769
770 static int range_tr_destroy(void *key, void *datum, void *p)
771 {
772 struct mls_range *rt = datum;
773 kfree(key);
774 ebitmap_destroy(&rt->level[0].cat);
775 ebitmap_destroy(&rt->level[1].cat);
776 kfree(datum);
777 cond_resched();
778 return 0;
779 }
780
781 static void ocontext_destroy(struct ocontext *c, int i)
782 {
783 if (!c)
784 return;
785
786 context_destroy(&c->context[0]);
787 context_destroy(&c->context[1]);
788 if (i == OCON_ISID || i == OCON_FS ||
789 i == OCON_NETIF || i == OCON_FSUSE)
790 kfree(c->u.name);
791 kfree(c);
792 }
793
794 /*
795 * Free any memory allocated by a policy database structure.
796 */
797 void policydb_destroy(struct policydb *p)
798 {
799 struct ocontext *c, *ctmp;
800 struct genfs *g, *gtmp;
801 int i;
802 struct role_allow *ra, *lra = NULL;
803 struct role_trans *tr, *ltr = NULL;
804
805 for (i = 0; i < SYM_NUM; i++) {
806 cond_resched();
807 hashtab_map(p->symtab[i].table, destroy_f[i], NULL);
808 hashtab_destroy(p->symtab[i].table);
809 }
810
811 for (i = 0; i < SYM_NUM; i++) {
812 if (p->sym_val_to_name[i])
813 flex_array_free(p->sym_val_to_name[i]);
814 }
815
816 kfree(p->class_val_to_struct);
817 kfree(p->role_val_to_struct);
818 kfree(p->user_val_to_struct);
819 if (p->type_val_to_struct_array)
820 flex_array_free(p->type_val_to_struct_array);
821
822 avtab_destroy(&p->te_avtab);
823
824 for (i = 0; i < OCON_NUM; i++) {
825 cond_resched();
826 c = p->ocontexts[i];
827 while (c) {
828 ctmp = c;
829 c = c->next;
830 ocontext_destroy(ctmp, i);
831 }
832 p->ocontexts[i] = NULL;
833 }
834
835 g = p->genfs;
836 while (g) {
837 cond_resched();
838 kfree(g->fstype);
839 c = g->head;
840 while (c) {
841 ctmp = c;
842 c = c->next;
843 ocontext_destroy(ctmp, OCON_FSUSE);
844 }
845 gtmp = g;
846 g = g->next;
847 kfree(gtmp);
848 }
849 p->genfs = NULL;
850
851 cond_policydb_destroy(p);
852
853 for (tr = p->role_tr; tr; tr = tr->next) {
854 cond_resched();
855 kfree(ltr);
856 ltr = tr;
857 }
858 kfree(ltr);
859
860 for (ra = p->role_allow; ra; ra = ra->next) {
861 cond_resched();
862 kfree(lra);
863 lra = ra;
864 }
865 kfree(lra);
866
867 hashtab_map(p->filename_trans, filenametr_destroy, NULL);
868 hashtab_destroy(p->filename_trans);
869
870 hashtab_map(p->range_tr, range_tr_destroy, NULL);
871 hashtab_destroy(p->range_tr);
872
873 if (p->type_attr_map_array) {
874 for (i = 0; i < p->p_types.nprim; i++) {
875 struct ebitmap *e;
876
877 e = flex_array_get(p->type_attr_map_array, i);
878 if (!e)
879 continue;
880 ebitmap_destroy(e);
881 }
882 flex_array_free(p->type_attr_map_array);
883 }
884
885 ebitmap_destroy(&p->filename_trans_ttypes);
886 ebitmap_destroy(&p->policycaps);
887 ebitmap_destroy(&p->permissive_map);
888 }
889
890 /*
891 * Load the initial SIDs specified in a policy database
892 * structure into a SID table.
893 */
894 int policydb_load_isids(struct policydb *p, struct sidtab *s)
895 {
896 struct ocontext *head, *c;
897 int rc;
898
899 rc = sidtab_init(s);
900 if (rc) {
901 printk(KERN_ERR "SELinux: out of memory on SID table init\n");
902 goto out;
903 }
904
905 head = p->ocontexts[OCON_ISID];
906 for (c = head; c; c = c->next) {
907 rc = -EINVAL;
908 if (!c->context[0].user) {
909 printk(KERN_ERR "SELinux: SID %s was never defined.\n",
910 c->u.name);
911 goto out;
912 }
913
914 rc = sidtab_insert(s, c->sid[0], &c->context[0]);
915 if (rc) {
916 printk(KERN_ERR "SELinux: unable to load initial SID %s.\n",
917 c->u.name);
918 goto out;
919 }
920 }
921 rc = 0;
922 out:
923 return rc;
924 }
925
926 int policydb_class_isvalid(struct policydb *p, unsigned int class)
927 {
928 if (!class || class > p->p_classes.nprim)
929 return 0;
930 return 1;
931 }
932
933 int policydb_role_isvalid(struct policydb *p, unsigned int role)
934 {
935 if (!role || role > p->p_roles.nprim)
936 return 0;
937 return 1;
938 }
939
940 int policydb_type_isvalid(struct policydb *p, unsigned int type)
941 {
942 if (!type || type > p->p_types.nprim)
943 return 0;
944 return 1;
945 }
946
947 /*
948 * Return 1 if the fields in the security context
949 * structure `c' are valid. Return 0 otherwise.
950 */
951 int policydb_context_isvalid(struct policydb *p, struct context *c)
952 {
953 struct role_datum *role;
954 struct user_datum *usrdatum;
955
956 if (!c->role || c->role > p->p_roles.nprim)
957 return 0;
958
959 if (!c->user || c->user > p->p_users.nprim)
960 return 0;
961
962 if (!c->type || c->type > p->p_types.nprim)
963 return 0;
964
965 if (c->role != OBJECT_R_VAL) {
966 /*
967 * Role must be authorized for the type.
968 */
969 role = p->role_val_to_struct[c->role - 1];
970 if (!role || !ebitmap_get_bit(&role->types, c->type - 1))
971 /* role may not be associated with type */
972 return 0;
973
974 /*
975 * User must be authorized for the role.
976 */
977 usrdatum = p->user_val_to_struct[c->user - 1];
978 if (!usrdatum)
979 return 0;
980
981 if (!ebitmap_get_bit(&usrdatum->roles, c->role - 1))
982 /* user may not be associated with role */
983 return 0;
984 }
985
986 if (!mls_context_isvalid(p, c))
987 return 0;
988
989 return 1;
990 }
991
992 /*
993 * Read a MLS range structure from a policydb binary
994 * representation file.
995 */
996 static int mls_read_range_helper(struct mls_range *r, void *fp)
997 {
998 __le32 buf[2];
999 u32 items;
1000 int rc;
1001
1002 rc = next_entry(buf, fp, sizeof(u32));
1003 if (rc)
1004 goto out;
1005
1006 rc = -EINVAL;
1007 items = le32_to_cpu(buf[0]);
1008 if (items > ARRAY_SIZE(buf)) {
1009 printk(KERN_ERR "SELinux: mls: range overflow\n");
1010 goto out;
1011 }
1012
1013 rc = next_entry(buf, fp, sizeof(u32) * items);
1014 if (rc) {
1015 printk(KERN_ERR "SELinux: mls: truncated range\n");
1016 goto out;
1017 }
1018
1019 r->level[0].sens = le32_to_cpu(buf[0]);
1020 if (items > 1)
1021 r->level[1].sens = le32_to_cpu(buf[1]);
1022 else
1023 r->level[1].sens = r->level[0].sens;
1024
1025 rc = ebitmap_read(&r->level[0].cat, fp);
1026 if (rc) {
1027 printk(KERN_ERR "SELinux: mls: error reading low categories\n");
1028 goto out;
1029 }
1030 if (items > 1) {
1031 rc = ebitmap_read(&r->level[1].cat, fp);
1032 if (rc) {
1033 printk(KERN_ERR "SELinux: mls: error reading high categories\n");
1034 goto bad_high;
1035 }
1036 } else {
1037 rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat);
1038 if (rc) {
1039 printk(KERN_ERR "SELinux: mls: out of memory\n");
1040 goto bad_high;
1041 }
1042 }
1043
1044 return 0;
1045 bad_high:
1046 ebitmap_destroy(&r->level[0].cat);
1047 out:
1048 return rc;
1049 }
1050
1051 /*
1052 * Read and validate a security context structure
1053 * from a policydb binary representation file.
1054 */
1055 static int context_read_and_validate(struct context *c,
1056 struct policydb *p,
1057 void *fp)
1058 {
1059 __le32 buf[3];
1060 int rc;
1061
1062 rc = next_entry(buf, fp, sizeof buf);
1063 if (rc) {
1064 printk(KERN_ERR "SELinux: context truncated\n");
1065 goto out;
1066 }
1067 c->user = le32_to_cpu(buf[0]);
1068 c->role = le32_to_cpu(buf[1]);
1069 c->type = le32_to_cpu(buf[2]);
1070 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1071 rc = mls_read_range_helper(&c->range, fp);
1072 if (rc) {
1073 printk(KERN_ERR "SELinux: error reading MLS range of context\n");
1074 goto out;
1075 }
1076 }
1077
1078 rc = -EINVAL;
1079 if (!policydb_context_isvalid(p, c)) {
1080 printk(KERN_ERR "SELinux: invalid security context\n");
1081 context_destroy(c);
1082 goto out;
1083 }
1084 rc = 0;
1085 out:
1086 return rc;
1087 }
1088
1089 /*
1090 * The following *_read functions are used to
1091 * read the symbol data from a policy database
1092 * binary representation file.
1093 */
1094
1095 static int str_read(char **strp, gfp_t flags, void *fp, u32 len)
1096 {
1097 int rc;
1098 char *str;
1099
1100 if ((len == 0) || (len == (u32)-1))
1101 return -EINVAL;
1102
1103 str = kmalloc(len + 1, flags | __GFP_NOWARN);
1104 if (!str)
1105 return -ENOMEM;
1106
1107 /* it's expected the caller should free the str */
1108 *strp = str;
1109
1110 rc = next_entry(str, fp, len);
1111 if (rc)
1112 return rc;
1113
1114 str[len] = '\0';
1115 return 0;
1116 }
1117
1118 static int perm_read(struct policydb *p, struct hashtab *h, void *fp)
1119 {
1120 char *key = NULL;
1121 struct perm_datum *perdatum;
1122 int rc;
1123 __le32 buf[2];
1124 u32 len;
1125
1126 perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
1127 if (!perdatum)
1128 return -ENOMEM;
1129
1130 rc = next_entry(buf, fp, sizeof buf);
1131 if (rc)
1132 goto bad;
1133
1134 len = le32_to_cpu(buf[0]);
1135 perdatum->value = le32_to_cpu(buf[1]);
1136
1137 rc = str_read(&key, GFP_KERNEL, fp, len);
1138 if (rc)
1139 goto bad;
1140
1141 rc = hashtab_insert(h, key, perdatum);
1142 if (rc)
1143 goto bad;
1144
1145 return 0;
1146 bad:
1147 perm_destroy(key, perdatum, NULL);
1148 return rc;
1149 }
1150
1151 static int common_read(struct policydb *p, struct hashtab *h, void *fp)
1152 {
1153 char *key = NULL;
1154 struct common_datum *comdatum;
1155 __le32 buf[4];
1156 u32 len, nel;
1157 int i, rc;
1158
1159 comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
1160 if (!comdatum)
1161 return -ENOMEM;
1162
1163 rc = next_entry(buf, fp, sizeof buf);
1164 if (rc)
1165 goto bad;
1166
1167 len = le32_to_cpu(buf[0]);
1168 comdatum->value = le32_to_cpu(buf[1]);
1169
1170 rc = symtab_init(&comdatum->permissions, PERM_SYMTAB_SIZE);
1171 if (rc)
1172 goto bad;
1173 comdatum->permissions.nprim = le32_to_cpu(buf[2]);
1174 nel = le32_to_cpu(buf[3]);
1175
1176 rc = str_read(&key, GFP_KERNEL, fp, len);
1177 if (rc)
1178 goto bad;
1179
1180 for (i = 0; i < nel; i++) {
1181 rc = perm_read(p, comdatum->permissions.table, fp);
1182 if (rc)
1183 goto bad;
1184 }
1185
1186 rc = hashtab_insert(h, key, comdatum);
1187 if (rc)
1188 goto bad;
1189 return 0;
1190 bad:
1191 common_destroy(key, comdatum, NULL);
1192 return rc;
1193 }
1194
1195 static void type_set_init(struct type_set *t)
1196 {
1197 ebitmap_init(&t->types);
1198 ebitmap_init(&t->negset);
1199 }
1200
1201 static int type_set_read(struct type_set *t, void *fp)
1202 {
1203 __le32 buf[1];
1204 int rc;
1205
1206 if (ebitmap_read(&t->types, fp))
1207 return -EINVAL;
1208 if (ebitmap_read(&t->negset, fp))
1209 return -EINVAL;
1210
1211 rc = next_entry(buf, fp, sizeof(u32));
1212 if (rc < 0)
1213 return -EINVAL;
1214 t->flags = le32_to_cpu(buf[0]);
1215
1216 return 0;
1217 }
1218
1219
1220 static int read_cons_helper(struct policydb *p,
1221 struct constraint_node **nodep,
1222 int ncons, int allowxtarget, void *fp)
1223 {
1224 struct constraint_node *c, *lc;
1225 struct constraint_expr *e, *le;
1226 __le32 buf[3];
1227 u32 nexpr;
1228 int rc, i, j, depth;
1229
1230 lc = NULL;
1231 for (i = 0; i < ncons; i++) {
1232 c = kzalloc(sizeof(*c), GFP_KERNEL);
1233 if (!c)
1234 return -ENOMEM;
1235
1236 if (lc)
1237 lc->next = c;
1238 else
1239 *nodep = c;
1240
1241 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1242 if (rc)
1243 return rc;
1244 c->permissions = le32_to_cpu(buf[0]);
1245 nexpr = le32_to_cpu(buf[1]);
1246 le = NULL;
1247 depth = -1;
1248 for (j = 0; j < nexpr; j++) {
1249 e = kzalloc(sizeof(*e), GFP_KERNEL);
1250 if (!e)
1251 return -ENOMEM;
1252
1253 if (le)
1254 le->next = e;
1255 else
1256 c->expr = e;
1257
1258 rc = next_entry(buf, fp, (sizeof(u32) * 3));
1259 if (rc)
1260 return rc;
1261 e->expr_type = le32_to_cpu(buf[0]);
1262 e->attr = le32_to_cpu(buf[1]);
1263 e->op = le32_to_cpu(buf[2]);
1264
1265 switch (e->expr_type) {
1266 case CEXPR_NOT:
1267 if (depth < 0)
1268 return -EINVAL;
1269 break;
1270 case CEXPR_AND:
1271 case CEXPR_OR:
1272 if (depth < 1)
1273 return -EINVAL;
1274 depth--;
1275 break;
1276 case CEXPR_ATTR:
1277 if (depth == (CEXPR_MAXDEPTH - 1))
1278 return -EINVAL;
1279 depth++;
1280 break;
1281 case CEXPR_NAMES:
1282 if (!allowxtarget && (e->attr & CEXPR_XTARGET))
1283 return -EINVAL;
1284 if (depth == (CEXPR_MAXDEPTH - 1))
1285 return -EINVAL;
1286 depth++;
1287 rc = ebitmap_read(&e->names, fp);
1288 if (rc)
1289 return rc;
1290 if (p->policyvers >=
1291 POLICYDB_VERSION_CONSTRAINT_NAMES) {
1292 e->type_names = kzalloc(sizeof
1293 (*e->type_names),
1294 GFP_KERNEL);
1295 if (!e->type_names)
1296 return -ENOMEM;
1297 type_set_init(e->type_names);
1298 rc = type_set_read(e->type_names, fp);
1299 if (rc)
1300 return rc;
1301 }
1302 break;
1303 default:
1304 return -EINVAL;
1305 }
1306 le = e;
1307 }
1308 if (depth != 0)
1309 return -EINVAL;
1310 lc = c;
1311 }
1312
1313 return 0;
1314 }
1315
1316 static int class_read(struct policydb *p, struct hashtab *h, void *fp)
1317 {
1318 char *key = NULL;
1319 struct class_datum *cladatum;
1320 __le32 buf[6];
1321 u32 len, len2, ncons, nel;
1322 int i, rc;
1323
1324 cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
1325 if (!cladatum)
1326 return -ENOMEM;
1327
1328 rc = next_entry(buf, fp, sizeof(u32)*6);
1329 if (rc)
1330 goto bad;
1331
1332 len = le32_to_cpu(buf[0]);
1333 len2 = le32_to_cpu(buf[1]);
1334 cladatum->value = le32_to_cpu(buf[2]);
1335
1336 rc = symtab_init(&cladatum->permissions, PERM_SYMTAB_SIZE);
1337 if (rc)
1338 goto bad;
1339 cladatum->permissions.nprim = le32_to_cpu(buf[3]);
1340 nel = le32_to_cpu(buf[4]);
1341
1342 ncons = le32_to_cpu(buf[5]);
1343
1344 rc = str_read(&key, GFP_KERNEL, fp, len);
1345 if (rc)
1346 goto bad;
1347
1348 if (len2) {
1349 rc = str_read(&cladatum->comkey, GFP_KERNEL, fp, len2);
1350 if (rc)
1351 goto bad;
1352
1353 rc = -EINVAL;
1354 cladatum->comdatum = hashtab_search(p->p_commons.table, cladatum->comkey);
1355 if (!cladatum->comdatum) {
1356 printk(KERN_ERR "SELinux: unknown common %s\n", cladatum->comkey);
1357 goto bad;
1358 }
1359 }
1360 for (i = 0; i < nel; i++) {
1361 rc = perm_read(p, cladatum->permissions.table, fp);
1362 if (rc)
1363 goto bad;
1364 }
1365
1366 rc = read_cons_helper(p, &cladatum->constraints, ncons, 0, fp);
1367 if (rc)
1368 goto bad;
1369
1370 if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
1371 /* grab the validatetrans rules */
1372 rc = next_entry(buf, fp, sizeof(u32));
1373 if (rc)
1374 goto bad;
1375 ncons = le32_to_cpu(buf[0]);
1376 rc = read_cons_helper(p, &cladatum->validatetrans,
1377 ncons, 1, fp);
1378 if (rc)
1379 goto bad;
1380 }
1381
1382 if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
1383 rc = next_entry(buf, fp, sizeof(u32) * 3);
1384 if (rc)
1385 goto bad;
1386
1387 cladatum->default_user = le32_to_cpu(buf[0]);
1388 cladatum->default_role = le32_to_cpu(buf[1]);
1389 cladatum->default_range = le32_to_cpu(buf[2]);
1390 }
1391
1392 if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
1393 rc = next_entry(buf, fp, sizeof(u32) * 1);
1394 if (rc)
1395 goto bad;
1396 cladatum->default_type = le32_to_cpu(buf[0]);
1397 }
1398
1399 rc = hashtab_insert(h, key, cladatum);
1400 if (rc)
1401 goto bad;
1402
1403 return 0;
1404 bad:
1405 cls_destroy(key, cladatum, NULL);
1406 return rc;
1407 }
1408
1409 static int role_read(struct policydb *p, struct hashtab *h, void *fp)
1410 {
1411 char *key = NULL;
1412 struct role_datum *role;
1413 int rc, to_read = 2;
1414 __le32 buf[3];
1415 u32 len;
1416
1417 role = kzalloc(sizeof(*role), GFP_KERNEL);
1418 if (!role)
1419 return -ENOMEM;
1420
1421 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1422 to_read = 3;
1423
1424 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1425 if (rc)
1426 goto bad;
1427
1428 len = le32_to_cpu(buf[0]);
1429 role->value = le32_to_cpu(buf[1]);
1430 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1431 role->bounds = le32_to_cpu(buf[2]);
1432
1433 rc = str_read(&key, GFP_KERNEL, fp, len);
1434 if (rc)
1435 goto bad;
1436
1437 rc = ebitmap_read(&role->dominates, fp);
1438 if (rc)
1439 goto bad;
1440
1441 rc = ebitmap_read(&role->types, fp);
1442 if (rc)
1443 goto bad;
1444
1445 if (strcmp(key, OBJECT_R) == 0) {
1446 rc = -EINVAL;
1447 if (role->value != OBJECT_R_VAL) {
1448 printk(KERN_ERR "SELinux: Role %s has wrong value %d\n",
1449 OBJECT_R, role->value);
1450 goto bad;
1451 }
1452 rc = 0;
1453 goto bad;
1454 }
1455
1456 rc = hashtab_insert(h, key, role);
1457 if (rc)
1458 goto bad;
1459 return 0;
1460 bad:
1461 role_destroy(key, role, NULL);
1462 return rc;
1463 }
1464
1465 static int type_read(struct policydb *p, struct hashtab *h, void *fp)
1466 {
1467 char *key = NULL;
1468 struct type_datum *typdatum;
1469 int rc, to_read = 3;
1470 __le32 buf[4];
1471 u32 len;
1472
1473 typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL);
1474 if (!typdatum)
1475 return -ENOMEM;
1476
1477 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1478 to_read = 4;
1479
1480 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1481 if (rc)
1482 goto bad;
1483
1484 len = le32_to_cpu(buf[0]);
1485 typdatum->value = le32_to_cpu(buf[1]);
1486 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
1487 u32 prop = le32_to_cpu(buf[2]);
1488
1489 if (prop & TYPEDATUM_PROPERTY_PRIMARY)
1490 typdatum->primary = 1;
1491 if (prop & TYPEDATUM_PROPERTY_ATTRIBUTE)
1492 typdatum->attribute = 1;
1493
1494 typdatum->bounds = le32_to_cpu(buf[3]);
1495 } else {
1496 typdatum->primary = le32_to_cpu(buf[2]);
1497 }
1498
1499 rc = str_read(&key, GFP_KERNEL, fp, len);
1500 if (rc)
1501 goto bad;
1502
1503 rc = hashtab_insert(h, key, typdatum);
1504 if (rc)
1505 goto bad;
1506 return 0;
1507 bad:
1508 type_destroy(key, typdatum, NULL);
1509 return rc;
1510 }
1511
1512
1513 /*
1514 * Read a MLS level structure from a policydb binary
1515 * representation file.
1516 */
1517 static int mls_read_level(struct mls_level *lp, void *fp)
1518 {
1519 __le32 buf[1];
1520 int rc;
1521
1522 memset(lp, 0, sizeof(*lp));
1523
1524 rc = next_entry(buf, fp, sizeof buf);
1525 if (rc) {
1526 printk(KERN_ERR "SELinux: mls: truncated level\n");
1527 return rc;
1528 }
1529 lp->sens = le32_to_cpu(buf[0]);
1530
1531 rc = ebitmap_read(&lp->cat, fp);
1532 if (rc) {
1533 printk(KERN_ERR "SELinux: mls: error reading level categories\n");
1534 return rc;
1535 }
1536 return 0;
1537 }
1538
1539 static int user_read(struct policydb *p, struct hashtab *h, void *fp)
1540 {
1541 char *key = NULL;
1542 struct user_datum *usrdatum;
1543 int rc, to_read = 2;
1544 __le32 buf[3];
1545 u32 len;
1546
1547 usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
1548 if (!usrdatum)
1549 return -ENOMEM;
1550
1551 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1552 to_read = 3;
1553
1554 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1555 if (rc)
1556 goto bad;
1557
1558 len = le32_to_cpu(buf[0]);
1559 usrdatum->value = le32_to_cpu(buf[1]);
1560 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1561 usrdatum->bounds = le32_to_cpu(buf[2]);
1562
1563 rc = str_read(&key, GFP_KERNEL, fp, len);
1564 if (rc)
1565 goto bad;
1566
1567 rc = ebitmap_read(&usrdatum->roles, fp);
1568 if (rc)
1569 goto bad;
1570
1571 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1572 rc = mls_read_range_helper(&usrdatum->range, fp);
1573 if (rc)
1574 goto bad;
1575 rc = mls_read_level(&usrdatum->dfltlevel, fp);
1576 if (rc)
1577 goto bad;
1578 }
1579
1580 rc = hashtab_insert(h, key, usrdatum);
1581 if (rc)
1582 goto bad;
1583 return 0;
1584 bad:
1585 user_destroy(key, usrdatum, NULL);
1586 return rc;
1587 }
1588
1589 static int sens_read(struct policydb *p, struct hashtab *h, void *fp)
1590 {
1591 char *key = NULL;
1592 struct level_datum *levdatum;
1593 int rc;
1594 __le32 buf[2];
1595 u32 len;
1596
1597 levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC);
1598 if (!levdatum)
1599 return -ENOMEM;
1600
1601 rc = next_entry(buf, fp, sizeof buf);
1602 if (rc)
1603 goto bad;
1604
1605 len = le32_to_cpu(buf[0]);
1606 levdatum->isalias = le32_to_cpu(buf[1]);
1607
1608 rc = str_read(&key, GFP_ATOMIC, fp, len);
1609 if (rc)
1610 goto bad;
1611
1612 rc = -ENOMEM;
1613 levdatum->level = kmalloc(sizeof(*levdatum->level), GFP_ATOMIC);
1614 if (!levdatum->level)
1615 goto bad;
1616
1617 rc = mls_read_level(levdatum->level, fp);
1618 if (rc)
1619 goto bad;
1620
1621 rc = hashtab_insert(h, key, levdatum);
1622 if (rc)
1623 goto bad;
1624 return 0;
1625 bad:
1626 sens_destroy(key, levdatum, NULL);
1627 return rc;
1628 }
1629
1630 static int cat_read(struct policydb *p, struct hashtab *h, void *fp)
1631 {
1632 char *key = NULL;
1633 struct cat_datum *catdatum;
1634 int rc;
1635 __le32 buf[3];
1636 u32 len;
1637
1638 catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC);
1639 if (!catdatum)
1640 return -ENOMEM;
1641
1642 rc = next_entry(buf, fp, sizeof buf);
1643 if (rc)
1644 goto bad;
1645
1646 len = le32_to_cpu(buf[0]);
1647 catdatum->value = le32_to_cpu(buf[1]);
1648 catdatum->isalias = le32_to_cpu(buf[2]);
1649
1650 rc = str_read(&key, GFP_ATOMIC, fp, len);
1651 if (rc)
1652 goto bad;
1653
1654 rc = hashtab_insert(h, key, catdatum);
1655 if (rc)
1656 goto bad;
1657 return 0;
1658 bad:
1659 cat_destroy(key, catdatum, NULL);
1660 return rc;
1661 }
1662
1663 static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, void *fp) =
1664 {
1665 common_read,
1666 class_read,
1667 role_read,
1668 type_read,
1669 user_read,
1670 cond_read_bool,
1671 sens_read,
1672 cat_read,
1673 };
1674
1675 static int user_bounds_sanity_check(void *key, void *datum, void *datap)
1676 {
1677 struct user_datum *upper, *user;
1678 struct policydb *p = datap;
1679 int depth = 0;
1680
1681 upper = user = datum;
1682 while (upper->bounds) {
1683 struct ebitmap_node *node;
1684 unsigned long bit;
1685
1686 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1687 printk(KERN_ERR "SELinux: user %s: "
1688 "too deep or looped boundary",
1689 (char *) key);
1690 return -EINVAL;
1691 }
1692
1693 upper = p->user_val_to_struct[upper->bounds - 1];
1694 ebitmap_for_each_positive_bit(&user->roles, node, bit) {
1695 if (ebitmap_get_bit(&upper->roles, bit))
1696 continue;
1697
1698 printk(KERN_ERR
1699 "SELinux: boundary violated policy: "
1700 "user=%s role=%s bounds=%s\n",
1701 sym_name(p, SYM_USERS, user->value - 1),
1702 sym_name(p, SYM_ROLES, bit),
1703 sym_name(p, SYM_USERS, upper->value - 1));
1704
1705 return -EINVAL;
1706 }
1707 }
1708
1709 return 0;
1710 }
1711
1712 static int role_bounds_sanity_check(void *key, void *datum, void *datap)
1713 {
1714 struct role_datum *upper, *role;
1715 struct policydb *p = datap;
1716 int depth = 0;
1717
1718 upper = role = datum;
1719 while (upper->bounds) {
1720 struct ebitmap_node *node;
1721 unsigned long bit;
1722
1723 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1724 printk(KERN_ERR "SELinux: role %s: "
1725 "too deep or looped bounds\n",
1726 (char *) key);
1727 return -EINVAL;
1728 }
1729
1730 upper = p->role_val_to_struct[upper->bounds - 1];
1731 ebitmap_for_each_positive_bit(&role->types, node, bit) {
1732 if (ebitmap_get_bit(&upper->types, bit))
1733 continue;
1734
1735 printk(KERN_ERR
1736 "SELinux: boundary violated policy: "
1737 "role=%s type=%s bounds=%s\n",
1738 sym_name(p, SYM_ROLES, role->value - 1),
1739 sym_name(p, SYM_TYPES, bit),
1740 sym_name(p, SYM_ROLES, upper->value - 1));
1741
1742 return -EINVAL;
1743 }
1744 }
1745
1746 return 0;
1747 }
1748
1749 static int type_bounds_sanity_check(void *key, void *datum, void *datap)
1750 {
1751 struct type_datum *upper;
1752 struct policydb *p = datap;
1753 int depth = 0;
1754
1755 upper = datum;
1756 while (upper->bounds) {
1757 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1758 printk(KERN_ERR "SELinux: type %s: "
1759 "too deep or looped boundary\n",
1760 (char *) key);
1761 return -EINVAL;
1762 }
1763
1764 upper = flex_array_get_ptr(p->type_val_to_struct_array,
1765 upper->bounds - 1);
1766 BUG_ON(!upper);
1767
1768 if (upper->attribute) {
1769 printk(KERN_ERR "SELinux: type %s: "
1770 "bounded by attribute %s",
1771 (char *) key,
1772 sym_name(p, SYM_TYPES, upper->value - 1));
1773 return -EINVAL;
1774 }
1775 }
1776
1777 return 0;
1778 }
1779
1780 static int policydb_bounds_sanity_check(struct policydb *p)
1781 {
1782 int rc;
1783
1784 if (p->policyvers < POLICYDB_VERSION_BOUNDARY)
1785 return 0;
1786
1787 rc = hashtab_map(p->p_users.table,
1788 user_bounds_sanity_check, p);
1789 if (rc)
1790 return rc;
1791
1792 rc = hashtab_map(p->p_roles.table,
1793 role_bounds_sanity_check, p);
1794 if (rc)
1795 return rc;
1796
1797 rc = hashtab_map(p->p_types.table,
1798 type_bounds_sanity_check, p);
1799 if (rc)
1800 return rc;
1801
1802 return 0;
1803 }
1804
1805 u16 string_to_security_class(struct policydb *p, const char *name)
1806 {
1807 struct class_datum *cladatum;
1808
1809 cladatum = hashtab_search(p->p_classes.table, name);
1810 if (!cladatum)
1811 return 0;
1812
1813 return cladatum->value;
1814 }
1815
1816 u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name)
1817 {
1818 struct class_datum *cladatum;
1819 struct perm_datum *perdatum = NULL;
1820 struct common_datum *comdatum;
1821
1822 if (!tclass || tclass > p->p_classes.nprim)
1823 return 0;
1824
1825 cladatum = p->class_val_to_struct[tclass-1];
1826 comdatum = cladatum->comdatum;
1827 if (comdatum)
1828 perdatum = hashtab_search(comdatum->permissions.table,
1829 name);
1830 if (!perdatum)
1831 perdatum = hashtab_search(cladatum->permissions.table,
1832 name);
1833 if (!perdatum)
1834 return 0;
1835
1836 return 1U << (perdatum->value-1);
1837 }
1838
1839 static int range_read(struct policydb *p, void *fp)
1840 {
1841 struct range_trans *rt = NULL;
1842 struct mls_range *r = NULL;
1843 int i, rc;
1844 __le32 buf[2];
1845 u32 nel;
1846
1847 if (p->policyvers < POLICYDB_VERSION_MLS)
1848 return 0;
1849
1850 rc = next_entry(buf, fp, sizeof(u32));
1851 if (rc)
1852 return rc;
1853
1854 nel = le32_to_cpu(buf[0]);
1855 for (i = 0; i < nel; i++) {
1856 rc = -ENOMEM;
1857 rt = kzalloc(sizeof(*rt), GFP_KERNEL);
1858 if (!rt)
1859 goto out;
1860
1861 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1862 if (rc)
1863 goto out;
1864
1865 rt->source_type = le32_to_cpu(buf[0]);
1866 rt->target_type = le32_to_cpu(buf[1]);
1867 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
1868 rc = next_entry(buf, fp, sizeof(u32));
1869 if (rc)
1870 goto out;
1871 rt->target_class = le32_to_cpu(buf[0]);
1872 } else
1873 rt->target_class = p->process_class;
1874
1875 rc = -EINVAL;
1876 if (!policydb_type_isvalid(p, rt->source_type) ||
1877 !policydb_type_isvalid(p, rt->target_type) ||
1878 !policydb_class_isvalid(p, rt->target_class))
1879 goto out;
1880
1881 rc = -ENOMEM;
1882 r = kzalloc(sizeof(*r), GFP_KERNEL);
1883 if (!r)
1884 goto out;
1885
1886 rc = mls_read_range_helper(r, fp);
1887 if (rc)
1888 goto out;
1889
1890 rc = -EINVAL;
1891 if (!mls_range_isvalid(p, r)) {
1892 printk(KERN_WARNING "SELinux: rangetrans: invalid range\n");
1893 goto out;
1894 }
1895
1896 rc = hashtab_insert(p->range_tr, rt, r);
1897 if (rc)
1898 goto out;
1899
1900 rt = NULL;
1901 r = NULL;
1902 }
1903 hash_eval(p->range_tr, "rangetr");
1904 rc = 0;
1905 out:
1906 kfree(rt);
1907 kfree(r);
1908 return rc;
1909 }
1910
1911 static int filename_trans_read(struct policydb *p, void *fp)
1912 {
1913 struct filename_trans *ft;
1914 struct filename_trans_datum *otype;
1915 char *name;
1916 u32 nel, len;
1917 __le32 buf[4];
1918 int rc, i;
1919
1920 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
1921 return 0;
1922
1923 rc = next_entry(buf, fp, sizeof(u32));
1924 if (rc)
1925 return rc;
1926 nel = le32_to_cpu(buf[0]);
1927
1928 for (i = 0; i < nel; i++) {
1929 otype = NULL;
1930 name = NULL;
1931
1932 rc = -ENOMEM;
1933 ft = kzalloc(sizeof(*ft), GFP_KERNEL);
1934 if (!ft)
1935 goto out;
1936
1937 rc = -ENOMEM;
1938 otype = kmalloc(sizeof(*otype), GFP_KERNEL);
1939 if (!otype)
1940 goto out;
1941
1942 /* length of the path component string */
1943 rc = next_entry(buf, fp, sizeof(u32));
1944 if (rc)
1945 goto out;
1946 len = le32_to_cpu(buf[0]);
1947
1948 /* path component string */
1949 rc = str_read(&name, GFP_KERNEL, fp, len);
1950 if (rc)
1951 goto out;
1952
1953 ft->name = name;
1954
1955 rc = next_entry(buf, fp, sizeof(u32) * 4);
1956 if (rc)
1957 goto out;
1958
1959 ft->stype = le32_to_cpu(buf[0]);
1960 ft->ttype = le32_to_cpu(buf[1]);
1961 ft->tclass = le32_to_cpu(buf[2]);
1962
1963 otype->otype = le32_to_cpu(buf[3]);
1964
1965 rc = ebitmap_set_bit(&p->filename_trans_ttypes, ft->ttype, 1);
1966 if (rc)
1967 goto out;
1968
1969 rc = hashtab_insert(p->filename_trans, ft, otype);
1970 if (rc) {
1971 /*
1972 * Do not return -EEXIST to the caller, or the system
1973 * will not boot.
1974 */
1975 if (rc != -EEXIST)
1976 goto out;
1977 /* But free memory to avoid memory leak. */
1978 kfree(ft);
1979 kfree(name);
1980 kfree(otype);
1981 }
1982 }
1983 hash_eval(p->filename_trans, "filenametr");
1984 return 0;
1985 out:
1986 kfree(ft);
1987 kfree(name);
1988 kfree(otype);
1989
1990 return rc;
1991 }
1992
1993 static int genfs_read(struct policydb *p, void *fp)
1994 {
1995 int i, j, rc;
1996 u32 nel, nel2, len, len2;
1997 __le32 buf[1];
1998 struct ocontext *l, *c;
1999 struct ocontext *newc = NULL;
2000 struct genfs *genfs_p, *genfs;
2001 struct genfs *newgenfs = NULL;
2002
2003 rc = next_entry(buf, fp, sizeof(u32));
2004 if (rc)
2005 return rc;
2006 nel = le32_to_cpu(buf[0]);
2007
2008 for (i = 0; i < nel; i++) {
2009 rc = next_entry(buf, fp, sizeof(u32));
2010 if (rc)
2011 goto out;
2012 len = le32_to_cpu(buf[0]);
2013
2014 rc = -ENOMEM;
2015 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
2016 if (!newgenfs)
2017 goto out;
2018
2019 rc = str_read(&newgenfs->fstype, GFP_KERNEL, fp, len);
2020 if (rc)
2021 goto out;
2022
2023 for (genfs_p = NULL, genfs = p->genfs; genfs;
2024 genfs_p = genfs, genfs = genfs->next) {
2025 rc = -EINVAL;
2026 if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
2027 printk(KERN_ERR "SELinux: dup genfs fstype %s\n",
2028 newgenfs->fstype);
2029 goto out;
2030 }
2031 if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
2032 break;
2033 }
2034 newgenfs->next = genfs;
2035 if (genfs_p)
2036 genfs_p->next = newgenfs;
2037 else
2038 p->genfs = newgenfs;
2039 genfs = newgenfs;
2040 newgenfs = NULL;
2041
2042 rc = next_entry(buf, fp, sizeof(u32));
2043 if (rc)
2044 goto out;
2045
2046 nel2 = le32_to_cpu(buf[0]);
2047 for (j = 0; j < nel2; j++) {
2048 rc = next_entry(buf, fp, sizeof(u32));
2049 if (rc)
2050 goto out;
2051 len = le32_to_cpu(buf[0]);
2052
2053 rc = -ENOMEM;
2054 newc = kzalloc(sizeof(*newc), GFP_KERNEL);
2055 if (!newc)
2056 goto out;
2057
2058 rc = str_read(&newc->u.name, GFP_KERNEL, fp, len);
2059 if (rc)
2060 goto out;
2061
2062 rc = next_entry(buf, fp, sizeof(u32));
2063 if (rc)
2064 goto out;
2065
2066 newc->v.sclass = le32_to_cpu(buf[0]);
2067 rc = context_read_and_validate(&newc->context[0], p, fp);
2068 if (rc)
2069 goto out;
2070
2071 for (l = NULL, c = genfs->head; c;
2072 l = c, c = c->next) {
2073 rc = -EINVAL;
2074 if (!strcmp(newc->u.name, c->u.name) &&
2075 (!c->v.sclass || !newc->v.sclass ||
2076 newc->v.sclass == c->v.sclass)) {
2077 printk(KERN_ERR "SELinux: dup genfs entry (%s,%s)\n",
2078 genfs->fstype, c->u.name);
2079 goto out;
2080 }
2081 len = strlen(newc->u.name);
2082 len2 = strlen(c->u.name);
2083 if (len > len2)
2084 break;
2085 }
2086
2087 newc->next = c;
2088 if (l)
2089 l->next = newc;
2090 else
2091 genfs->head = newc;
2092 newc = NULL;
2093 }
2094 }
2095 rc = 0;
2096 out:
2097 if (newgenfs) {
2098 kfree(newgenfs->fstype);
2099 kfree(newgenfs);
2100 }
2101 ocontext_destroy(newc, OCON_FSUSE);
2102
2103 return rc;
2104 }
2105
2106 static int ocontext_read(struct policydb *p, struct policydb_compat_info *info,
2107 void *fp)
2108 {
2109 int i, j, rc;
2110 u32 nel, len;
2111 __be64 prefixbuf[1];
2112 __le32 buf[3];
2113 struct ocontext *l, *c;
2114 u32 nodebuf[8];
2115
2116 for (i = 0; i < info->ocon_num; i++) {
2117 rc = next_entry(buf, fp, sizeof(u32));
2118 if (rc)
2119 goto out;
2120 nel = le32_to_cpu(buf[0]);
2121
2122 l = NULL;
2123 for (j = 0; j < nel; j++) {
2124 rc = -ENOMEM;
2125 c = kzalloc(sizeof(*c), GFP_KERNEL);
2126 if (!c)
2127 goto out;
2128 if (l)
2129 l->next = c;
2130 else
2131 p->ocontexts[i] = c;
2132 l = c;
2133
2134 switch (i) {
2135 case OCON_ISID:
2136 rc = next_entry(buf, fp, sizeof(u32));
2137 if (rc)
2138 goto out;
2139
2140 c->sid[0] = le32_to_cpu(buf[0]);
2141 rc = context_read_and_validate(&c->context[0], p, fp);
2142 if (rc)
2143 goto out;
2144 break;
2145 case OCON_FS:
2146 case OCON_NETIF:
2147 rc = next_entry(buf, fp, sizeof(u32));
2148 if (rc)
2149 goto out;
2150 len = le32_to_cpu(buf[0]);
2151
2152 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2153 if (rc)
2154 goto out;
2155
2156 rc = context_read_and_validate(&c->context[0], p, fp);
2157 if (rc)
2158 goto out;
2159 rc = context_read_and_validate(&c->context[1], p, fp);
2160 if (rc)
2161 goto out;
2162 break;
2163 case OCON_PORT:
2164 rc = next_entry(buf, fp, sizeof(u32)*3);
2165 if (rc)
2166 goto out;
2167 c->u.port.protocol = le32_to_cpu(buf[0]);
2168 c->u.port.low_port = le32_to_cpu(buf[1]);
2169 c->u.port.high_port = le32_to_cpu(buf[2]);
2170 rc = context_read_and_validate(&c->context[0], p, fp);
2171 if (rc)
2172 goto out;
2173 break;
2174 case OCON_NODE:
2175 rc = next_entry(nodebuf, fp, sizeof(u32) * 2);
2176 if (rc)
2177 goto out;
2178 c->u.node.addr = nodebuf[0]; /* network order */
2179 c->u.node.mask = nodebuf[1]; /* network order */
2180 rc = context_read_and_validate(&c->context[0], p, fp);
2181 if (rc)
2182 goto out;
2183 break;
2184 case OCON_FSUSE:
2185 rc = next_entry(buf, fp, sizeof(u32)*2);
2186 if (rc)
2187 goto out;
2188
2189 rc = -EINVAL;
2190 c->v.behavior = le32_to_cpu(buf[0]);
2191 /* Determined at runtime, not in policy DB. */
2192 if (c->v.behavior == SECURITY_FS_USE_MNTPOINT)
2193 goto out;
2194 if (c->v.behavior > SECURITY_FS_USE_MAX)
2195 goto out;
2196
2197 len = le32_to_cpu(buf[1]);
2198 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2199 if (rc)
2200 goto out;
2201
2202 rc = context_read_and_validate(&c->context[0], p, fp);
2203 if (rc)
2204 goto out;
2205 break;
2206 case OCON_NODE6: {
2207 int k;
2208
2209 rc = next_entry(nodebuf, fp, sizeof(u32) * 8);
2210 if (rc)
2211 goto out;
2212 for (k = 0; k < 4; k++)
2213 c->u.node6.addr[k] = nodebuf[k];
2214 for (k = 0; k < 4; k++)
2215 c->u.node6.mask[k] = nodebuf[k+4];
2216 rc = context_read_and_validate(&c->context[0], p, fp);
2217 if (rc)
2218 goto out;
2219 break;
2220 }
2221 case OCON_IBPKEY: {
2222 u32 pkey_lo, pkey_hi;
2223
2224 rc = next_entry(prefixbuf, fp, sizeof(u64));
2225 if (rc)
2226 goto out;
2227
2228 /* we need to have subnet_prefix in CPU order */
2229 c->u.ibpkey.subnet_prefix = be64_to_cpu(prefixbuf[0]);
2230
2231 rc = next_entry(buf, fp, sizeof(u32) * 2);
2232 if (rc)
2233 goto out;
2234
2235 pkey_lo = le32_to_cpu(buf[0]);
2236 pkey_hi = le32_to_cpu(buf[1]);
2237
2238 if (pkey_lo > U16_MAX || pkey_hi > U16_MAX) {
2239 rc = -EINVAL;
2240 goto out;
2241 }
2242
2243 c->u.ibpkey.low_pkey = pkey_lo;
2244 c->u.ibpkey.high_pkey = pkey_hi;
2245
2246 rc = context_read_and_validate(&c->context[0],
2247 p,
2248 fp);
2249 if (rc)
2250 goto out;
2251 break;
2252 }
2253 case OCON_IBENDPORT: {
2254 u32 port;
2255
2256 rc = next_entry(buf, fp, sizeof(u32) * 2);
2257 if (rc)
2258 goto out;
2259 len = le32_to_cpu(buf[0]);
2260
2261 rc = str_read(&c->u.ibendport.dev_name, GFP_KERNEL, fp, len);
2262 if (rc)
2263 goto out;
2264
2265 port = le32_to_cpu(buf[1]);
2266 if (port > U8_MAX || port == 0) {
2267 rc = -EINVAL;
2268 goto out;
2269 }
2270
2271 c->u.ibendport.port = port;
2272
2273 rc = context_read_and_validate(&c->context[0],
2274 p,
2275 fp);
2276 if (rc)
2277 goto out;
2278 break;
2279 } /* end case */
2280 } /* end switch */
2281 }
2282 }
2283 rc = 0;
2284 out:
2285 return rc;
2286 }
2287
2288 /*
2289 * Read the configuration data from a policy database binary
2290 * representation file into a policy database structure.
2291 */
2292 int policydb_read(struct policydb *p, void *fp)
2293 {
2294 struct role_allow *ra, *lra;
2295 struct role_trans *tr, *ltr;
2296 int i, j, rc;
2297 __le32 buf[4];
2298 u32 len, nprim, nel;
2299
2300 char *policydb_str;
2301 struct policydb_compat_info *info;
2302
2303 rc = policydb_init(p);
2304 if (rc)
2305 return rc;
2306
2307 /* Read the magic number and string length. */
2308 rc = next_entry(buf, fp, sizeof(u32) * 2);
2309 if (rc)
2310 goto bad;
2311
2312 rc = -EINVAL;
2313 if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
2314 printk(KERN_ERR "SELinux: policydb magic number 0x%x does "
2315 "not match expected magic number 0x%x\n",
2316 le32_to_cpu(buf[0]), POLICYDB_MAGIC);
2317 goto bad;
2318 }
2319
2320 rc = -EINVAL;
2321 len = le32_to_cpu(buf[1]);
2322 if (len != strlen(POLICYDB_STRING)) {
2323 printk(KERN_ERR "SELinux: policydb string length %d does not "
2324 "match expected length %zu\n",
2325 len, strlen(POLICYDB_STRING));
2326 goto bad;
2327 }
2328
2329 rc = -ENOMEM;
2330 policydb_str = kmalloc(len + 1, GFP_KERNEL);
2331 if (!policydb_str) {
2332 printk(KERN_ERR "SELinux: unable to allocate memory for policydb "
2333 "string of length %d\n", len);
2334 goto bad;
2335 }
2336
2337 rc = next_entry(policydb_str, fp, len);
2338 if (rc) {
2339 printk(KERN_ERR "SELinux: truncated policydb string identifier\n");
2340 kfree(policydb_str);
2341 goto bad;
2342 }
2343
2344 rc = -EINVAL;
2345 policydb_str[len] = '\0';
2346 if (strcmp(policydb_str, POLICYDB_STRING)) {
2347 printk(KERN_ERR "SELinux: policydb string %s does not match "
2348 "my string %s\n", policydb_str, POLICYDB_STRING);
2349 kfree(policydb_str);
2350 goto bad;
2351 }
2352 /* Done with policydb_str. */
2353 kfree(policydb_str);
2354 policydb_str = NULL;
2355
2356 /* Read the version and table sizes. */
2357 rc = next_entry(buf, fp, sizeof(u32)*4);
2358 if (rc)
2359 goto bad;
2360
2361 rc = -EINVAL;
2362 p->policyvers = le32_to_cpu(buf[0]);
2363 if (p->policyvers < POLICYDB_VERSION_MIN ||
2364 p->policyvers > POLICYDB_VERSION_MAX) {
2365 printk(KERN_ERR "SELinux: policydb version %d does not match "
2366 "my version range %d-%d\n",
2367 le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
2368 goto bad;
2369 }
2370
2371 if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
2372 p->mls_enabled = 1;
2373
2374 rc = -EINVAL;
2375 if (p->policyvers < POLICYDB_VERSION_MLS) {
2376 printk(KERN_ERR "SELinux: security policydb version %d "
2377 "(MLS) not backwards compatible\n",
2378 p->policyvers);
2379 goto bad;
2380 }
2381 }
2382 p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
2383 p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
2384
2385 if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
2386 rc = ebitmap_read(&p->policycaps, fp);
2387 if (rc)
2388 goto bad;
2389 }
2390
2391 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
2392 rc = ebitmap_read(&p->permissive_map, fp);
2393 if (rc)
2394 goto bad;
2395 }
2396
2397 rc = -EINVAL;
2398 info = policydb_lookup_compat(p->policyvers);
2399 if (!info) {
2400 printk(KERN_ERR "SELinux: unable to find policy compat info "
2401 "for version %d\n", p->policyvers);
2402 goto bad;
2403 }
2404
2405 rc = -EINVAL;
2406 if (le32_to_cpu(buf[2]) != info->sym_num ||
2407 le32_to_cpu(buf[3]) != info->ocon_num) {
2408 printk(KERN_ERR "SELinux: policydb table sizes (%d,%d) do "
2409 "not match mine (%d,%d)\n", le32_to_cpu(buf[2]),
2410 le32_to_cpu(buf[3]),
2411 info->sym_num, info->ocon_num);
2412 goto bad;
2413 }
2414
2415 for (i = 0; i < info->sym_num; i++) {
2416 rc = next_entry(buf, fp, sizeof(u32)*2);
2417 if (rc)
2418 goto bad;
2419 nprim = le32_to_cpu(buf[0]);
2420 nel = le32_to_cpu(buf[1]);
2421 for (j = 0; j < nel; j++) {
2422 rc = read_f[i](p, p->symtab[i].table, fp);
2423 if (rc)
2424 goto bad;
2425 }
2426
2427 p->symtab[i].nprim = nprim;
2428 }
2429
2430 rc = -EINVAL;
2431 p->process_class = string_to_security_class(p, "process");
2432 if (!p->process_class)
2433 goto bad;
2434
2435 rc = avtab_read(&p->te_avtab, fp, p);
2436 if (rc)
2437 goto bad;
2438
2439 if (p->policyvers >= POLICYDB_VERSION_BOOL) {
2440 rc = cond_read_list(p, fp);
2441 if (rc)
2442 goto bad;
2443 }
2444
2445 rc = next_entry(buf, fp, sizeof(u32));
2446 if (rc)
2447 goto bad;
2448 nel = le32_to_cpu(buf[0]);
2449 ltr = NULL;
2450 for (i = 0; i < nel; i++) {
2451 rc = -ENOMEM;
2452 tr = kzalloc(sizeof(*tr), GFP_KERNEL);
2453 if (!tr)
2454 goto bad;
2455 if (ltr)
2456 ltr->next = tr;
2457 else
2458 p->role_tr = tr;
2459 rc = next_entry(buf, fp, sizeof(u32)*3);
2460 if (rc)
2461 goto bad;
2462
2463 rc = -EINVAL;
2464 tr->role = le32_to_cpu(buf[0]);
2465 tr->type = le32_to_cpu(buf[1]);
2466 tr->new_role = le32_to_cpu(buf[2]);
2467 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2468 rc = next_entry(buf, fp, sizeof(u32));
2469 if (rc)
2470 goto bad;
2471 tr->tclass = le32_to_cpu(buf[0]);
2472 } else
2473 tr->tclass = p->process_class;
2474
2475 rc = -EINVAL;
2476 if (!policydb_role_isvalid(p, tr->role) ||
2477 !policydb_type_isvalid(p, tr->type) ||
2478 !policydb_class_isvalid(p, tr->tclass) ||
2479 !policydb_role_isvalid(p, tr->new_role))
2480 goto bad;
2481 ltr = tr;
2482 }
2483
2484 rc = next_entry(buf, fp, sizeof(u32));
2485 if (rc)
2486 goto bad;
2487 nel = le32_to_cpu(buf[0]);
2488 lra = NULL;
2489 for (i = 0; i < nel; i++) {
2490 rc = -ENOMEM;
2491 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
2492 if (!ra)
2493 goto bad;
2494 if (lra)
2495 lra->next = ra;
2496 else
2497 p->role_allow = ra;
2498 rc = next_entry(buf, fp, sizeof(u32)*2);
2499 if (rc)
2500 goto bad;
2501
2502 rc = -EINVAL;
2503 ra->role = le32_to_cpu(buf[0]);
2504 ra->new_role = le32_to_cpu(buf[1]);
2505 if (!policydb_role_isvalid(p, ra->role) ||
2506 !policydb_role_isvalid(p, ra->new_role))
2507 goto bad;
2508 lra = ra;
2509 }
2510
2511 rc = filename_trans_read(p, fp);
2512 if (rc)
2513 goto bad;
2514
2515 rc = policydb_index(p);
2516 if (rc)
2517 goto bad;
2518
2519 rc = -EINVAL;
2520 p->process_trans_perms = string_to_av_perm(p, p->process_class, "transition");
2521 p->process_trans_perms |= string_to_av_perm(p, p->process_class, "dyntransition");
2522 if (!p->process_trans_perms)
2523 goto bad;
2524
2525 rc = ocontext_read(p, info, fp);
2526 if (rc)
2527 goto bad;
2528
2529 rc = genfs_read(p, fp);
2530 if (rc)
2531 goto bad;
2532
2533 rc = range_read(p, fp);
2534 if (rc)
2535 goto bad;
2536
2537 rc = -ENOMEM;
2538 p->type_attr_map_array = flex_array_alloc(sizeof(struct ebitmap),
2539 p->p_types.nprim,
2540 GFP_KERNEL | __GFP_ZERO);
2541 if (!p->type_attr_map_array)
2542 goto bad;
2543
2544 /* preallocate so we don't have to worry about the put ever failing */
2545 rc = flex_array_prealloc(p->type_attr_map_array, 0, p->p_types.nprim,
2546 GFP_KERNEL | __GFP_ZERO);
2547 if (rc)
2548 goto bad;
2549
2550 for (i = 0; i < p->p_types.nprim; i++) {
2551 struct ebitmap *e = flex_array_get(p->type_attr_map_array, i);
2552
2553 BUG_ON(!e);
2554 ebitmap_init(e);
2555 if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
2556 rc = ebitmap_read(e, fp);
2557 if (rc)
2558 goto bad;
2559 }
2560 /* add the type itself as the degenerate case */
2561 rc = ebitmap_set_bit(e, i, 1);
2562 if (rc)
2563 goto bad;
2564 }
2565
2566 rc = policydb_bounds_sanity_check(p);
2567 if (rc)
2568 goto bad;
2569
2570 rc = 0;
2571 out:
2572 return rc;
2573 bad:
2574 policydb_destroy(p);
2575 goto out;
2576 }
2577
2578 /*
2579 * Write a MLS level structure to a policydb binary
2580 * representation file.
2581 */
2582 static int mls_write_level(struct mls_level *l, void *fp)
2583 {
2584 __le32 buf[1];
2585 int rc;
2586
2587 buf[0] = cpu_to_le32(l->sens);
2588 rc = put_entry(buf, sizeof(u32), 1, fp);
2589 if (rc)
2590 return rc;
2591
2592 rc = ebitmap_write(&l->cat, fp);
2593 if (rc)
2594 return rc;
2595
2596 return 0;
2597 }
2598
2599 /*
2600 * Write a MLS range structure to a policydb binary
2601 * representation file.
2602 */
2603 static int mls_write_range_helper(struct mls_range *r, void *fp)
2604 {
2605 __le32 buf[3];
2606 size_t items;
2607 int rc, eq;
2608
2609 eq = mls_level_eq(&r->level[1], &r->level[0]);
2610
2611 if (eq)
2612 items = 2;
2613 else
2614 items = 3;
2615 buf[0] = cpu_to_le32(items-1);
2616 buf[1] = cpu_to_le32(r->level[0].sens);
2617 if (!eq)
2618 buf[2] = cpu_to_le32(r->level[1].sens);
2619
2620 BUG_ON(items > ARRAY_SIZE(buf));
2621
2622 rc = put_entry(buf, sizeof(u32), items, fp);
2623 if (rc)
2624 return rc;
2625
2626 rc = ebitmap_write(&r->level[0].cat, fp);
2627 if (rc)
2628 return rc;
2629 if (!eq) {
2630 rc = ebitmap_write(&r->level[1].cat, fp);
2631 if (rc)
2632 return rc;
2633 }
2634
2635 return 0;
2636 }
2637
2638 static int sens_write(void *vkey, void *datum, void *ptr)
2639 {
2640 char *key = vkey;
2641 struct level_datum *levdatum = datum;
2642 struct policy_data *pd = ptr;
2643 void *fp = pd->fp;
2644 __le32 buf[2];
2645 size_t len;
2646 int rc;
2647
2648 len = strlen(key);
2649 buf[0] = cpu_to_le32(len);
2650 buf[1] = cpu_to_le32(levdatum->isalias);
2651 rc = put_entry(buf, sizeof(u32), 2, fp);
2652 if (rc)
2653 return rc;
2654
2655 rc = put_entry(key, 1, len, fp);
2656 if (rc)
2657 return rc;
2658
2659 rc = mls_write_level(levdatum->level, fp);
2660 if (rc)
2661 return rc;
2662
2663 return 0;
2664 }
2665
2666 static int cat_write(void *vkey, void *datum, void *ptr)
2667 {
2668 char *key = vkey;
2669 struct cat_datum *catdatum = datum;
2670 struct policy_data *pd = ptr;
2671 void *fp = pd->fp;
2672 __le32 buf[3];
2673 size_t len;
2674 int rc;
2675
2676 len = strlen(key);
2677 buf[0] = cpu_to_le32(len);
2678 buf[1] = cpu_to_le32(catdatum->value);
2679 buf[2] = cpu_to_le32(catdatum->isalias);
2680 rc = put_entry(buf, sizeof(u32), 3, fp);
2681 if (rc)
2682 return rc;
2683
2684 rc = put_entry(key, 1, len, fp);
2685 if (rc)
2686 return rc;
2687
2688 return 0;
2689 }
2690
2691 static int role_trans_write(struct policydb *p, void *fp)
2692 {
2693 struct role_trans *r = p->role_tr;
2694 struct role_trans *tr;
2695 u32 buf[3];
2696 size_t nel;
2697 int rc;
2698
2699 nel = 0;
2700 for (tr = r; tr; tr = tr->next)
2701 nel++;
2702 buf[0] = cpu_to_le32(nel);
2703 rc = put_entry(buf, sizeof(u32), 1, fp);
2704 if (rc)
2705 return rc;
2706 for (tr = r; tr; tr = tr->next) {
2707 buf[0] = cpu_to_le32(tr->role);
2708 buf[1] = cpu_to_le32(tr->type);
2709 buf[2] = cpu_to_le32(tr->new_role);
2710 rc = put_entry(buf, sizeof(u32), 3, fp);
2711 if (rc)
2712 return rc;
2713 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2714 buf[0] = cpu_to_le32(tr->tclass);
2715 rc = put_entry(buf, sizeof(u32), 1, fp);
2716 if (rc)
2717 return rc;
2718 }
2719 }
2720
2721 return 0;
2722 }
2723
2724 static int role_allow_write(struct role_allow *r, void *fp)
2725 {
2726 struct role_allow *ra;
2727 u32 buf[2];
2728 size_t nel;
2729 int rc;
2730
2731 nel = 0;
2732 for (ra = r; ra; ra = ra->next)
2733 nel++;
2734 buf[0] = cpu_to_le32(nel);
2735 rc = put_entry(buf, sizeof(u32), 1, fp);
2736 if (rc)
2737 return rc;
2738 for (ra = r; ra; ra = ra->next) {
2739 buf[0] = cpu_to_le32(ra->role);
2740 buf[1] = cpu_to_le32(ra->new_role);
2741 rc = put_entry(buf, sizeof(u32), 2, fp);
2742 if (rc)
2743 return rc;
2744 }
2745 return 0;
2746 }
2747
2748 /*
2749 * Write a security context structure
2750 * to a policydb binary representation file.
2751 */
2752 static int context_write(struct policydb *p, struct context *c,
2753 void *fp)
2754 {
2755 int rc;
2756 __le32 buf[3];
2757
2758 buf[0] = cpu_to_le32(c->user);
2759 buf[1] = cpu_to_le32(c->role);
2760 buf[2] = cpu_to_le32(c->type);
2761
2762 rc = put_entry(buf, sizeof(u32), 3, fp);
2763 if (rc)
2764 return rc;
2765
2766 rc = mls_write_range_helper(&c->range, fp);
2767 if (rc)
2768 return rc;
2769
2770 return 0;
2771 }
2772
2773 /*
2774 * The following *_write functions are used to
2775 * write the symbol data to a policy database
2776 * binary representation file.
2777 */
2778
2779 static int perm_write(void *vkey, void *datum, void *fp)
2780 {
2781 char *key = vkey;
2782 struct perm_datum *perdatum = datum;
2783 __le32 buf[2];
2784 size_t len;
2785 int rc;
2786
2787 len = strlen(key);
2788 buf[0] = cpu_to_le32(len);
2789 buf[1] = cpu_to_le32(perdatum->value);
2790 rc = put_entry(buf, sizeof(u32), 2, fp);
2791 if (rc)
2792 return rc;
2793
2794 rc = put_entry(key, 1, len, fp);
2795 if (rc)
2796 return rc;
2797
2798 return 0;
2799 }
2800
2801 static int common_write(void *vkey, void *datum, void *ptr)
2802 {
2803 char *key = vkey;
2804 struct common_datum *comdatum = datum;
2805 struct policy_data *pd = ptr;
2806 void *fp = pd->fp;
2807 __le32 buf[4];
2808 size_t len;
2809 int rc;
2810
2811 len = strlen(key);
2812 buf[0] = cpu_to_le32(len);
2813 buf[1] = cpu_to_le32(comdatum->value);
2814 buf[2] = cpu_to_le32(comdatum->permissions.nprim);
2815 buf[3] = cpu_to_le32(comdatum->permissions.table->nel);
2816 rc = put_entry(buf, sizeof(u32), 4, fp);
2817 if (rc)
2818 return rc;
2819
2820 rc = put_entry(key, 1, len, fp);
2821 if (rc)
2822 return rc;
2823
2824 rc = hashtab_map(comdatum->permissions.table, perm_write, fp);
2825 if (rc)
2826 return rc;
2827
2828 return 0;
2829 }
2830
2831 static int type_set_write(struct type_set *t, void *fp)
2832 {
2833 int rc;
2834 __le32 buf[1];
2835
2836 if (ebitmap_write(&t->types, fp))
2837 return -EINVAL;
2838 if (ebitmap_write(&t->negset, fp))
2839 return -EINVAL;
2840
2841 buf[0] = cpu_to_le32(t->flags);
2842 rc = put_entry(buf, sizeof(u32), 1, fp);
2843 if (rc)
2844 return -EINVAL;
2845
2846 return 0;
2847 }
2848
2849 static int write_cons_helper(struct policydb *p, struct constraint_node *node,
2850 void *fp)
2851 {
2852 struct constraint_node *c;
2853 struct constraint_expr *e;
2854 __le32 buf[3];
2855 u32 nel;
2856 int rc;
2857
2858 for (c = node; c; c = c->next) {
2859 nel = 0;
2860 for (e = c->expr; e; e = e->next)
2861 nel++;
2862 buf[0] = cpu_to_le32(c->permissions);
2863 buf[1] = cpu_to_le32(nel);
2864 rc = put_entry(buf, sizeof(u32), 2, fp);
2865 if (rc)
2866 return rc;
2867 for (e = c->expr; e; e = e->next) {
2868 buf[0] = cpu_to_le32(e->expr_type);
2869 buf[1] = cpu_to_le32(e->attr);
2870 buf[2] = cpu_to_le32(e->op);
2871 rc = put_entry(buf, sizeof(u32), 3, fp);
2872 if (rc)
2873 return rc;
2874
2875 switch (e->expr_type) {
2876 case CEXPR_NAMES:
2877 rc = ebitmap_write(&e->names, fp);
2878 if (rc)
2879 return rc;
2880 if (p->policyvers >=
2881 POLICYDB_VERSION_CONSTRAINT_NAMES) {
2882 rc = type_set_write(e->type_names, fp);
2883 if (rc)
2884 return rc;
2885 }
2886 break;
2887 default:
2888 break;
2889 }
2890 }
2891 }
2892
2893 return 0;
2894 }
2895
2896 static int class_write(void *vkey, void *datum, void *ptr)
2897 {
2898 char *key = vkey;
2899 struct class_datum *cladatum = datum;
2900 struct policy_data *pd = ptr;
2901 void *fp = pd->fp;
2902 struct policydb *p = pd->p;
2903 struct constraint_node *c;
2904 __le32 buf[6];
2905 u32 ncons;
2906 size_t len, len2;
2907 int rc;
2908
2909 len = strlen(key);
2910 if (cladatum->comkey)
2911 len2 = strlen(cladatum->comkey);
2912 else
2913 len2 = 0;
2914
2915 ncons = 0;
2916 for (c = cladatum->constraints; c; c = c->next)
2917 ncons++;
2918
2919 buf[0] = cpu_to_le32(len);
2920 buf[1] = cpu_to_le32(len2);
2921 buf[2] = cpu_to_le32(cladatum->value);
2922 buf[3] = cpu_to_le32(cladatum->permissions.nprim);
2923 if (cladatum->permissions.table)
2924 buf[4] = cpu_to_le32(cladatum->permissions.table->nel);
2925 else
2926 buf[4] = 0;
2927 buf[5] = cpu_to_le32(ncons);
2928 rc = put_entry(buf, sizeof(u32), 6, fp);
2929 if (rc)
2930 return rc;
2931
2932 rc = put_entry(key, 1, len, fp);
2933 if (rc)
2934 return rc;
2935
2936 if (cladatum->comkey) {
2937 rc = put_entry(cladatum->comkey, 1, len2, fp);
2938 if (rc)
2939 return rc;
2940 }
2941
2942 rc = hashtab_map(cladatum->permissions.table, perm_write, fp);
2943 if (rc)
2944 return rc;
2945
2946 rc = write_cons_helper(p, cladatum->constraints, fp);
2947 if (rc)
2948 return rc;
2949
2950 /* write out the validatetrans rule */
2951 ncons = 0;
2952 for (c = cladatum->validatetrans; c; c = c->next)
2953 ncons++;
2954
2955 buf[0] = cpu_to_le32(ncons);
2956 rc = put_entry(buf, sizeof(u32), 1, fp);
2957 if (rc)
2958 return rc;
2959
2960 rc = write_cons_helper(p, cladatum->validatetrans, fp);
2961 if (rc)
2962 return rc;
2963
2964 if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
2965 buf[0] = cpu_to_le32(cladatum->default_user);
2966 buf[1] = cpu_to_le32(cladatum->default_role);
2967 buf[2] = cpu_to_le32(cladatum->default_range);
2968
2969 rc = put_entry(buf, sizeof(uint32_t), 3, fp);
2970 if (rc)
2971 return rc;
2972 }
2973
2974 if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
2975 buf[0] = cpu_to_le32(cladatum->default_type);
2976 rc = put_entry(buf, sizeof(uint32_t), 1, fp);
2977 if (rc)
2978 return rc;
2979 }
2980
2981 return 0;
2982 }
2983
2984 static int role_write(void *vkey, void *datum, void *ptr)
2985 {
2986 char *key = vkey;
2987 struct role_datum *role = datum;
2988 struct policy_data *pd = ptr;
2989 void *fp = pd->fp;
2990 struct policydb *p = pd->p;
2991 __le32 buf[3];
2992 size_t items, len;
2993 int rc;
2994
2995 len = strlen(key);
2996 items = 0;
2997 buf[items++] = cpu_to_le32(len);
2998 buf[items++] = cpu_to_le32(role->value);
2999 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
3000 buf[items++] = cpu_to_le32(role->bounds);
3001
3002 BUG_ON(items > ARRAY_SIZE(buf));
3003
3004 rc = put_entry(buf, sizeof(u32), items, fp);
3005 if (rc)
3006 return rc;
3007
3008 rc = put_entry(key, 1, len, fp);
3009 if (rc)
3010 return rc;
3011
3012 rc = ebitmap_write(&role->dominates, fp);
3013 if (rc)
3014 return rc;
3015
3016 rc = ebitmap_write(&role->types, fp);
3017 if (rc)
3018 return rc;
3019
3020 return 0;
3021 }
3022
3023 static int type_write(void *vkey, void *datum, void *ptr)
3024 {
3025 char *key = vkey;
3026 struct type_datum *typdatum = datum;
3027 struct policy_data *pd = ptr;
3028 struct policydb *p = pd->p;
3029 void *fp = pd->fp;
3030 __le32 buf[4];
3031 int rc;
3032 size_t items, len;
3033
3034 len = strlen(key);
3035 items = 0;
3036 buf[items++] = cpu_to_le32(len);
3037 buf[items++] = cpu_to_le32(typdatum->value);
3038 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
3039 u32 properties = 0;
3040
3041 if (typdatum->primary)
3042 properties |= TYPEDATUM_PROPERTY_PRIMARY;
3043
3044 if (typdatum->attribute)
3045 properties |= TYPEDATUM_PROPERTY_ATTRIBUTE;
3046
3047 buf[items++] = cpu_to_le32(properties);
3048 buf[items++] = cpu_to_le32(typdatum->bounds);
3049 } else {
3050 buf[items++] = cpu_to_le32(typdatum->primary);
3051 }
3052 BUG_ON(items > ARRAY_SIZE(buf));
3053 rc = put_entry(buf, sizeof(u32), items, fp);
3054 if (rc)
3055 return rc;
3056
3057 rc = put_entry(key, 1, len, fp);
3058 if (rc)
3059 return rc;
3060
3061 return 0;
3062 }
3063
3064 static int user_write(void *vkey, void *datum, void *ptr)
3065 {
3066 char *key = vkey;
3067 struct user_datum *usrdatum = datum;
3068 struct policy_data *pd = ptr;
3069 struct policydb *p = pd->p;
3070 void *fp = pd->fp;
3071 __le32 buf[3];
3072 size_t items, len;
3073 int rc;
3074
3075 len = strlen(key);
3076 items = 0;
3077 buf[items++] = cpu_to_le32(len);
3078 buf[items++] = cpu_to_le32(usrdatum->value);
3079 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
3080 buf[items++] = cpu_to_le32(usrdatum->bounds);
3081 BUG_ON(items > ARRAY_SIZE(buf));
3082 rc = put_entry(buf, sizeof(u32), items, fp);
3083 if (rc)
3084 return rc;
3085
3086 rc = put_entry(key, 1, len, fp);
3087 if (rc)
3088 return rc;
3089
3090 rc = ebitmap_write(&usrdatum->roles, fp);
3091 if (rc)
3092 return rc;
3093
3094 rc = mls_write_range_helper(&usrdatum->range, fp);
3095 if (rc)
3096 return rc;
3097
3098 rc = mls_write_level(&usrdatum->dfltlevel, fp);
3099 if (rc)
3100 return rc;
3101
3102 return 0;
3103 }
3104
3105 static int (*write_f[SYM_NUM]) (void *key, void *datum,
3106 void *datap) =
3107 {
3108 common_write,
3109 class_write,
3110 role_write,
3111 type_write,
3112 user_write,
3113 cond_write_bool,
3114 sens_write,
3115 cat_write,
3116 };
3117
3118 static int ocontext_write(struct policydb *p, struct policydb_compat_info *info,
3119 void *fp)
3120 {
3121 unsigned int i, j, rc;
3122 size_t nel, len;
3123 __be64 prefixbuf[1];
3124 __le32 buf[3];
3125 u32 nodebuf[8];
3126 struct ocontext *c;
3127 for (i = 0; i < info->ocon_num; i++) {
3128 nel = 0;
3129 for (c = p->ocontexts[i]; c; c = c->next)
3130 nel++;
3131 buf[0] = cpu_to_le32(nel);
3132 rc = put_entry(buf, sizeof(u32), 1, fp);
3133 if (rc)
3134 return rc;
3135 for (c = p->ocontexts[i]; c; c = c->next) {
3136 switch (i) {
3137 case OCON_ISID:
3138 buf[0] = cpu_to_le32(c->sid[0]);
3139 rc = put_entry(buf, sizeof(u32), 1, fp);
3140 if (rc)
3141 return rc;
3142 rc = context_write(p, &c->context[0], fp);
3143 if (rc)
3144 return rc;
3145 break;
3146 case OCON_FS:
3147 case OCON_NETIF:
3148 len = strlen(c->u.name);
3149 buf[0] = cpu_to_le32(len);
3150 rc = put_entry(buf, sizeof(u32), 1, fp);
3151 if (rc)
3152 return rc;
3153 rc = put_entry(c->u.name, 1, len, fp);
3154 if (rc)
3155 return rc;
3156 rc = context_write(p, &c->context[0], fp);
3157 if (rc)
3158 return rc;
3159 rc = context_write(p, &c->context[1], fp);
3160 if (rc)
3161 return rc;
3162 break;
3163 case OCON_PORT:
3164 buf[0] = cpu_to_le32(c->u.port.protocol);
3165 buf[1] = cpu_to_le32(c->u.port.low_port);
3166 buf[2] = cpu_to_le32(c->u.port.high_port);
3167 rc = put_entry(buf, sizeof(u32), 3, fp);
3168 if (rc)
3169 return rc;
3170 rc = context_write(p, &c->context[0], fp);
3171 if (rc)
3172 return rc;
3173 break;
3174 case OCON_NODE:
3175 nodebuf[0] = c->u.node.addr; /* network order */
3176 nodebuf[1] = c->u.node.mask; /* network order */
3177 rc = put_entry(nodebuf, sizeof(u32), 2, fp);
3178 if (rc)
3179 return rc;
3180 rc = context_write(p, &c->context[0], fp);
3181 if (rc)
3182 return rc;
3183 break;
3184 case OCON_FSUSE:
3185 buf[0] = cpu_to_le32(c->v.behavior);
3186 len = strlen(c->u.name);
3187 buf[1] = cpu_to_le32(len);
3188 rc = put_entry(buf, sizeof(u32), 2, fp);
3189 if (rc)
3190 return rc;
3191 rc = put_entry(c->u.name, 1, len, fp);
3192 if (rc)
3193 return rc;
3194 rc = context_write(p, &c->context[0], fp);
3195 if (rc)
3196 return rc;
3197 break;
3198 case OCON_NODE6:
3199 for (j = 0; j < 4; j++)
3200 nodebuf[j] = c->u.node6.addr[j]; /* network order */
3201 for (j = 0; j < 4; j++)
3202 nodebuf[j + 4] = c->u.node6.mask[j]; /* network order */
3203 rc = put_entry(nodebuf, sizeof(u32), 8, fp);
3204 if (rc)
3205 return rc;
3206 rc = context_write(p, &c->context[0], fp);
3207 if (rc)
3208 return rc;
3209 break;
3210 case OCON_IBPKEY:
3211 /* subnet_prefix is in CPU order */
3212 prefixbuf[0] = cpu_to_be64(c->u.ibpkey.subnet_prefix);
3213
3214 rc = put_entry(prefixbuf, sizeof(u64), 1, fp);
3215 if (rc)
3216 return rc;
3217
3218 buf[0] = cpu_to_le32(c->u.ibpkey.low_pkey);
3219 buf[1] = cpu_to_le32(c->u.ibpkey.high_pkey);
3220
3221 rc = put_entry(buf, sizeof(u32), 2, fp);
3222 if (rc)
3223 return rc;
3224 rc = context_write(p, &c->context[0], fp);
3225 if (rc)
3226 return rc;
3227 break;
3228 case OCON_IBENDPORT:
3229 len = strlen(c->u.ibendport.dev_name);
3230 buf[0] = cpu_to_le32(len);
3231 buf[1] = cpu_to_le32(c->u.ibendport.port);
3232 rc = put_entry(buf, sizeof(u32), 2, fp);
3233 if (rc)
3234 return rc;
3235 rc = put_entry(c->u.ibendport.dev_name, 1, len, fp);
3236 if (rc)
3237 return rc;
3238 rc = context_write(p, &c->context[0], fp);
3239 if (rc)
3240 return rc;
3241 break;
3242 }
3243 }
3244 }
3245 return 0;
3246 }
3247
3248 static int genfs_write(struct policydb *p, void *fp)
3249 {
3250 struct genfs *genfs;
3251 struct ocontext *c;
3252 size_t len;
3253 __le32 buf[1];
3254 int rc;
3255
3256 len = 0;
3257 for (genfs = p->genfs; genfs; genfs = genfs->next)
3258 len++;
3259 buf[0] = cpu_to_le32(len);
3260 rc = put_entry(buf, sizeof(u32), 1, fp);
3261 if (rc)
3262 return rc;
3263 for (genfs = p->genfs; genfs; genfs = genfs->next) {
3264 len = strlen(genfs->fstype);
3265 buf[0] = cpu_to_le32(len);
3266 rc = put_entry(buf, sizeof(u32), 1, fp);
3267 if (rc)
3268 return rc;
3269 rc = put_entry(genfs->fstype, 1, len, fp);
3270 if (rc)
3271 return rc;
3272 len = 0;
3273 for (c = genfs->head; c; c = c->next)
3274 len++;
3275 buf[0] = cpu_to_le32(len);
3276 rc = put_entry(buf, sizeof(u32), 1, fp);
3277 if (rc)
3278 return rc;
3279 for (c = genfs->head; c; c = c->next) {
3280 len = strlen(c->u.name);
3281 buf[0] = cpu_to_le32(len);
3282 rc = put_entry(buf, sizeof(u32), 1, fp);
3283 if (rc)
3284 return rc;
3285 rc = put_entry(c->u.name, 1, len, fp);
3286 if (rc)
3287 return rc;
3288 buf[0] = cpu_to_le32(c->v.sclass);
3289 rc = put_entry(buf, sizeof(u32), 1, fp);
3290 if (rc)
3291 return rc;
3292 rc = context_write(p, &c->context[0], fp);
3293 if (rc)
3294 return rc;
3295 }
3296 }
3297 return 0;
3298 }
3299
3300 static int hashtab_cnt(void *key, void *data, void *ptr)
3301 {
3302 int *cnt = ptr;
3303 *cnt = *cnt + 1;
3304
3305 return 0;
3306 }
3307
3308 static int range_write_helper(void *key, void *data, void *ptr)
3309 {
3310 __le32 buf[2];
3311 struct range_trans *rt = key;
3312 struct mls_range *r = data;
3313 struct policy_data *pd = ptr;
3314 void *fp = pd->fp;
3315 struct policydb *p = pd->p;
3316 int rc;
3317
3318 buf[0] = cpu_to_le32(rt->source_type);
3319 buf[1] = cpu_to_le32(rt->target_type);
3320 rc = put_entry(buf, sizeof(u32), 2, fp);
3321 if (rc)
3322 return rc;
3323 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
3324 buf[0] = cpu_to_le32(rt->target_class);
3325 rc = put_entry(buf, sizeof(u32), 1, fp);
3326 if (rc)
3327 return rc;
3328 }
3329 rc = mls_write_range_helper(r, fp);
3330 if (rc)
3331 return rc;
3332
3333 return 0;
3334 }
3335
3336 static int range_write(struct policydb *p, void *fp)
3337 {
3338 __le32 buf[1];
3339 int rc, nel;
3340 struct policy_data pd;
3341
3342 pd.p = p;
3343 pd.fp = fp;
3344
3345 /* count the number of entries in the hashtab */
3346 nel = 0;
3347 rc = hashtab_map(p->range_tr, hashtab_cnt, &nel);
3348 if (rc)
3349 return rc;
3350
3351 buf[0] = cpu_to_le32(nel);
3352 rc = put_entry(buf, sizeof(u32), 1, fp);
3353 if (rc)
3354 return rc;
3355
3356 /* actually write all of the entries */
3357 rc = hashtab_map(p->range_tr, range_write_helper, &pd);
3358 if (rc)
3359 return rc;
3360
3361 return 0;
3362 }
3363
3364 static int filename_write_helper(void *key, void *data, void *ptr)
3365 {
3366 __le32 buf[4];
3367 struct filename_trans *ft = key;
3368 struct filename_trans_datum *otype = data;
3369 void *fp = ptr;
3370 int rc;
3371 u32 len;
3372
3373 len = strlen(ft->name);
3374 buf[0] = cpu_to_le32(len);
3375 rc = put_entry(buf, sizeof(u32), 1, fp);
3376 if (rc)
3377 return rc;
3378
3379 rc = put_entry(ft->name, sizeof(char), len, fp);
3380 if (rc)
3381 return rc;
3382
3383 buf[0] = cpu_to_le32(ft->stype);
3384 buf[1] = cpu_to_le32(ft->ttype);
3385 buf[2] = cpu_to_le32(ft->tclass);
3386 buf[3] = cpu_to_le32(otype->otype);
3387
3388 rc = put_entry(buf, sizeof(u32), 4, fp);
3389 if (rc)
3390 return rc;
3391
3392 return 0;
3393 }
3394
3395 static int filename_trans_write(struct policydb *p, void *fp)
3396 {
3397 u32 nel;
3398 __le32 buf[1];
3399 int rc;
3400
3401 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
3402 return 0;
3403
3404 nel = 0;
3405 rc = hashtab_map(p->filename_trans, hashtab_cnt, &nel);
3406 if (rc)
3407 return rc;
3408
3409 buf[0] = cpu_to_le32(nel);
3410 rc = put_entry(buf, sizeof(u32), 1, fp);
3411 if (rc)
3412 return rc;
3413
3414 rc = hashtab_map(p->filename_trans, filename_write_helper, fp);
3415 if (rc)
3416 return rc;
3417
3418 return 0;
3419 }
3420
3421 /*
3422 * Write the configuration data in a policy database
3423 * structure to a policy database binary representation
3424 * file.
3425 */
3426 int policydb_write(struct policydb *p, void *fp)
3427 {
3428 unsigned int i, num_syms;
3429 int rc;
3430 __le32 buf[4];
3431 u32 config;
3432 size_t len;
3433 struct policydb_compat_info *info;
3434
3435 /*
3436 * refuse to write policy older than compressed avtab
3437 * to simplify the writer. There are other tests dropped
3438 * since we assume this throughout the writer code. Be
3439 * careful if you ever try to remove this restriction
3440 */
3441 if (p->policyvers < POLICYDB_VERSION_AVTAB) {
3442 printk(KERN_ERR "SELinux: refusing to write policy version %d."
3443 " Because it is less than version %d\n", p->policyvers,
3444 POLICYDB_VERSION_AVTAB);
3445 return -EINVAL;
3446 }
3447
3448 config = 0;
3449 if (p->mls_enabled)
3450 config |= POLICYDB_CONFIG_MLS;
3451
3452 if (p->reject_unknown)
3453 config |= REJECT_UNKNOWN;
3454 if (p->allow_unknown)
3455 config |= ALLOW_UNKNOWN;
3456
3457 /* Write the magic number and string identifiers. */
3458 buf[0] = cpu_to_le32(POLICYDB_MAGIC);
3459 len = strlen(POLICYDB_STRING);
3460 buf[1] = cpu_to_le32(len);
3461 rc = put_entry(buf, sizeof(u32), 2, fp);
3462 if (rc)
3463 return rc;
3464 rc = put_entry(POLICYDB_STRING, 1, len, fp);
3465 if (rc)
3466 return rc;
3467
3468 /* Write the version, config, and table sizes. */
3469 info = policydb_lookup_compat(p->policyvers);
3470 if (!info) {
3471 printk(KERN_ERR "SELinux: compatibility lookup failed for policy "
3472 "version %d", p->policyvers);
3473 return -EINVAL;
3474 }
3475
3476 buf[0] = cpu_to_le32(p->policyvers);
3477 buf[1] = cpu_to_le32(config);
3478 buf[2] = cpu_to_le32(info->sym_num);
3479 buf[3] = cpu_to_le32(info->ocon_num);
3480
3481 rc = put_entry(buf, sizeof(u32), 4, fp);
3482 if (rc)
3483 return rc;
3484
3485 if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
3486 rc = ebitmap_write(&p->policycaps, fp);
3487 if (rc)
3488 return rc;
3489 }
3490
3491 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
3492 rc = ebitmap_write(&p->permissive_map, fp);
3493 if (rc)
3494 return rc;
3495 }
3496
3497 num_syms = info->sym_num;
3498 for (i = 0; i < num_syms; i++) {
3499 struct policy_data pd;
3500
3501 pd.fp = fp;
3502 pd.p = p;
3503
3504 buf[0] = cpu_to_le32(p->symtab[i].nprim);
3505 buf[1] = cpu_to_le32(p->symtab[i].table->nel);
3506
3507 rc = put_entry(buf, sizeof(u32), 2, fp);
3508 if (rc)
3509 return rc;
3510 rc = hashtab_map(p->symtab[i].table, write_f[i], &pd);
3511 if (rc)
3512 return rc;
3513 }
3514
3515 rc = avtab_write(p, &p->te_avtab, fp);
3516 if (rc)
3517 return rc;
3518
3519 rc = cond_write_list(p, p->cond_list, fp);
3520 if (rc)
3521 return rc;
3522
3523 rc = role_trans_write(p, fp);
3524 if (rc)
3525 return rc;
3526
3527 rc = role_allow_write(p->role_allow, fp);
3528 if (rc)
3529 return rc;
3530
3531 rc = filename_trans_write(p, fp);
3532 if (rc)
3533 return rc;
3534
3535 rc = ocontext_write(p, info, fp);
3536 if (rc)
3537 return rc;
3538
3539 rc = genfs_write(p, fp);
3540 if (rc)
3541 return rc;
3542
3543 rc = range_write(p, fp);
3544 if (rc)
3545 return rc;
3546
3547 for (i = 0; i < p->p_types.nprim; i++) {
3548 struct ebitmap *e = flex_array_get(p->type_attr_map_array, i);
3549
3550 BUG_ON(!e);
3551 rc = ebitmap_write(e, fp);
3552 if (rc)
3553 return rc;
3554 }
3555
3556 return 0;
3557 }
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