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