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