Loading...
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
45static 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
57static unsigned int symtab_sizes[SYM_NUM] = {
58 2,
59 32,
60 16,
61 512,
62 128,
63 16,
64 16,
65 16,
66};
67
68struct 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 */
75static 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
158static 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 */
175static 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;
201out:
202 kfree(key);
203 kfree(role);
204 return rc;
205}
206
207static 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
222static 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
244static 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
251static 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 */
272static 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;
313out:
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
331static 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
349static 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
367static 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
388static 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
416static 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
437static 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
459static 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
480static 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
493static 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
503static 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
512static 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 */
523static 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 kmalloc(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 kmalloc(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 kmalloc(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;
599out:
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
609static int perm_destroy(void *key, void *datum, void *p)
610{
611 kfree(key);
612 kfree(datum);
613 return 0;
614}
615
616static 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
630static 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
643static 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
685static 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
699static int type_destroy(void *key, void *datum, void *p)
700{
701 kfree(key);
702 kfree(datum);
703 return 0;
704}
705
706static 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
722static 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
736static int cat_destroy(void *key, void *datum, void *p)
737{
738 kfree(key);
739 kfree(datum);
740 return 0;
741}
742
743static 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
755static 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
765static 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
776static 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 */
792void 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 */
891int 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;
919out:
920 return rc;
921}
922
923int 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
930int 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
937int 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 */
948int 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 (!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 */
993static 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;
1042bad_high:
1043 ebitmap_destroy(&r->level[0].cat);
1044out:
1045 return rc;
1046}
1047
1048/*
1049 * Read and validate a security context structure
1050 * from a policydb binary representation file.
1051 */
1052static 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;
1082out:
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
1092static int str_read(char **strp, gfp_t flags, void *fp, u32 len)
1093{
1094 int rc;
1095 char *str;
1096
1097 str = kmalloc(len + 1, flags);
1098 if (!str)
1099 return -ENOMEM;
1100
1101 /* it's expected the caller should free the str */
1102 *strp = str;
1103
1104 rc = next_entry(str, fp, len);
1105 if (rc)
1106 return rc;
1107
1108 str[len] = '\0';
1109 return 0;
1110}
1111
1112static int perm_read(struct policydb *p, struct hashtab *h, void *fp)
1113{
1114 char *key = NULL;
1115 struct perm_datum *perdatum;
1116 int rc;
1117 __le32 buf[2];
1118 u32 len;
1119
1120 rc = -ENOMEM;
1121 perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
1122 if (!perdatum)
1123 goto bad;
1124
1125 rc = next_entry(buf, fp, sizeof buf);
1126 if (rc)
1127 goto bad;
1128
1129 len = le32_to_cpu(buf[0]);
1130 perdatum->value = le32_to_cpu(buf[1]);
1131
1132 rc = str_read(&key, GFP_KERNEL, fp, len);
1133 if (rc)
1134 goto bad;
1135
1136 rc = hashtab_insert(h, key, perdatum);
1137 if (rc)
1138 goto bad;
1139
1140 return 0;
1141bad:
1142 perm_destroy(key, perdatum, NULL);
1143 return rc;
1144}
1145
1146static int common_read(struct policydb *p, struct hashtab *h, void *fp)
1147{
1148 char *key = NULL;
1149 struct common_datum *comdatum;
1150 __le32 buf[4];
1151 u32 len, nel;
1152 int i, rc;
1153
1154 rc = -ENOMEM;
1155 comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
1156 if (!comdatum)
1157 goto bad;
1158
1159 rc = next_entry(buf, fp, sizeof buf);
1160 if (rc)
1161 goto bad;
1162
1163 len = le32_to_cpu(buf[0]);
1164 comdatum->value = le32_to_cpu(buf[1]);
1165
1166 rc = symtab_init(&comdatum->permissions, PERM_SYMTAB_SIZE);
1167 if (rc)
1168 goto bad;
1169 comdatum->permissions.nprim = le32_to_cpu(buf[2]);
1170 nel = le32_to_cpu(buf[3]);
1171
1172 rc = str_read(&key, GFP_KERNEL, fp, len);
1173 if (rc)
1174 goto bad;
1175
1176 for (i = 0; i < nel; i++) {
1177 rc = perm_read(p, comdatum->permissions.table, fp);
1178 if (rc)
1179 goto bad;
1180 }
1181
1182 rc = hashtab_insert(h, key, comdatum);
1183 if (rc)
1184 goto bad;
1185 return 0;
1186bad:
1187 common_destroy(key, comdatum, NULL);
1188 return rc;
1189}
1190
1191static void type_set_init(struct type_set *t)
1192{
1193 ebitmap_init(&t->types);
1194 ebitmap_init(&t->negset);
1195}
1196
1197static int type_set_read(struct type_set *t, void *fp)
1198{
1199 __le32 buf[1];
1200 int rc;
1201
1202 if (ebitmap_read(&t->types, fp))
1203 return -EINVAL;
1204 if (ebitmap_read(&t->negset, fp))
1205 return -EINVAL;
1206
1207 rc = next_entry(buf, fp, sizeof(u32));
1208 if (rc < 0)
1209 return -EINVAL;
1210 t->flags = le32_to_cpu(buf[0]);
1211
1212 return 0;
1213}
1214
1215
1216static int read_cons_helper(struct policydb *p,
1217 struct constraint_node **nodep,
1218 int ncons, int allowxtarget, void *fp)
1219{
1220 struct constraint_node *c, *lc;
1221 struct constraint_expr *e, *le;
1222 __le32 buf[3];
1223 u32 nexpr;
1224 int rc, i, j, depth;
1225
1226 lc = NULL;
1227 for (i = 0; i < ncons; i++) {
1228 c = kzalloc(sizeof(*c), GFP_KERNEL);
1229 if (!c)
1230 return -ENOMEM;
1231
1232 if (lc)
1233 lc->next = c;
1234 else
1235 *nodep = c;
1236
1237 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1238 if (rc)
1239 return rc;
1240 c->permissions = le32_to_cpu(buf[0]);
1241 nexpr = le32_to_cpu(buf[1]);
1242 le = NULL;
1243 depth = -1;
1244 for (j = 0; j < nexpr; j++) {
1245 e = kzalloc(sizeof(*e), GFP_KERNEL);
1246 if (!e)
1247 return -ENOMEM;
1248
1249 if (le)
1250 le->next = e;
1251 else
1252 c->expr = e;
1253
1254 rc = next_entry(buf, fp, (sizeof(u32) * 3));
1255 if (rc)
1256 return rc;
1257 e->expr_type = le32_to_cpu(buf[0]);
1258 e->attr = le32_to_cpu(buf[1]);
1259 e->op = le32_to_cpu(buf[2]);
1260
1261 switch (e->expr_type) {
1262 case CEXPR_NOT:
1263 if (depth < 0)
1264 return -EINVAL;
1265 break;
1266 case CEXPR_AND:
1267 case CEXPR_OR:
1268 if (depth < 1)
1269 return -EINVAL;
1270 depth--;
1271 break;
1272 case CEXPR_ATTR:
1273 if (depth == (CEXPR_MAXDEPTH - 1))
1274 return -EINVAL;
1275 depth++;
1276 break;
1277 case CEXPR_NAMES:
1278 if (!allowxtarget && (e->attr & CEXPR_XTARGET))
1279 return -EINVAL;
1280 if (depth == (CEXPR_MAXDEPTH - 1))
1281 return -EINVAL;
1282 depth++;
1283 rc = ebitmap_read(&e->names, fp);
1284 if (rc)
1285 return rc;
1286 if (p->policyvers >=
1287 POLICYDB_VERSION_CONSTRAINT_NAMES) {
1288 e->type_names = kzalloc(sizeof
1289 (*e->type_names),
1290 GFP_KERNEL);
1291 if (!e->type_names)
1292 return -ENOMEM;
1293 type_set_init(e->type_names);
1294 rc = type_set_read(e->type_names, fp);
1295 if (rc)
1296 return rc;
1297 }
1298 break;
1299 default:
1300 return -EINVAL;
1301 }
1302 le = e;
1303 }
1304 if (depth != 0)
1305 return -EINVAL;
1306 lc = c;
1307 }
1308
1309 return 0;
1310}
1311
1312static int class_read(struct policydb *p, struct hashtab *h, void *fp)
1313{
1314 char *key = NULL;
1315 struct class_datum *cladatum;
1316 __le32 buf[6];
1317 u32 len, len2, ncons, nel;
1318 int i, rc;
1319
1320 rc = -ENOMEM;
1321 cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
1322 if (!cladatum)
1323 goto bad;
1324
1325 rc = next_entry(buf, fp, sizeof(u32)*6);
1326 if (rc)
1327 goto bad;
1328
1329 len = le32_to_cpu(buf[0]);
1330 len2 = le32_to_cpu(buf[1]);
1331 cladatum->value = le32_to_cpu(buf[2]);
1332
1333 rc = symtab_init(&cladatum->permissions, PERM_SYMTAB_SIZE);
1334 if (rc)
1335 goto bad;
1336 cladatum->permissions.nprim = le32_to_cpu(buf[3]);
1337 nel = le32_to_cpu(buf[4]);
1338
1339 ncons = le32_to_cpu(buf[5]);
1340
1341 rc = str_read(&key, GFP_KERNEL, fp, len);
1342 if (rc)
1343 goto bad;
1344
1345 if (len2) {
1346 rc = str_read(&cladatum->comkey, GFP_KERNEL, fp, len2);
1347 if (rc)
1348 goto bad;
1349
1350 rc = -EINVAL;
1351 cladatum->comdatum = hashtab_search(p->p_commons.table, cladatum->comkey);
1352 if (!cladatum->comdatum) {
1353 printk(KERN_ERR "SELinux: unknown common %s\n", cladatum->comkey);
1354 goto bad;
1355 }
1356 }
1357 for (i = 0; i < nel; i++) {
1358 rc = perm_read(p, cladatum->permissions.table, fp);
1359 if (rc)
1360 goto bad;
1361 }
1362
1363 rc = read_cons_helper(p, &cladatum->constraints, ncons, 0, fp);
1364 if (rc)
1365 goto bad;
1366
1367 if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
1368 /* grab the validatetrans rules */
1369 rc = next_entry(buf, fp, sizeof(u32));
1370 if (rc)
1371 goto bad;
1372 ncons = le32_to_cpu(buf[0]);
1373 rc = read_cons_helper(p, &cladatum->validatetrans,
1374 ncons, 1, fp);
1375 if (rc)
1376 goto bad;
1377 }
1378
1379 if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
1380 rc = next_entry(buf, fp, sizeof(u32) * 3);
1381 if (rc)
1382 goto bad;
1383
1384 cladatum->default_user = le32_to_cpu(buf[0]);
1385 cladatum->default_role = le32_to_cpu(buf[1]);
1386 cladatum->default_range = le32_to_cpu(buf[2]);
1387 }
1388
1389 if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
1390 rc = next_entry(buf, fp, sizeof(u32) * 1);
1391 if (rc)
1392 goto bad;
1393 cladatum->default_type = le32_to_cpu(buf[0]);
1394 }
1395
1396 rc = hashtab_insert(h, key, cladatum);
1397 if (rc)
1398 goto bad;
1399
1400 return 0;
1401bad:
1402 cls_destroy(key, cladatum, NULL);
1403 return rc;
1404}
1405
1406static int role_read(struct policydb *p, struct hashtab *h, void *fp)
1407{
1408 char *key = NULL;
1409 struct role_datum *role;
1410 int rc, to_read = 2;
1411 __le32 buf[3];
1412 u32 len;
1413
1414 rc = -ENOMEM;
1415 role = kzalloc(sizeof(*role), GFP_KERNEL);
1416 if (!role)
1417 goto bad;
1418
1419 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1420 to_read = 3;
1421
1422 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1423 if (rc)
1424 goto bad;
1425
1426 len = le32_to_cpu(buf[0]);
1427 role->value = le32_to_cpu(buf[1]);
1428 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1429 role->bounds = le32_to_cpu(buf[2]);
1430
1431 rc = str_read(&key, GFP_KERNEL, fp, len);
1432 if (rc)
1433 goto bad;
1434
1435 rc = ebitmap_read(&role->dominates, fp);
1436 if (rc)
1437 goto bad;
1438
1439 rc = ebitmap_read(&role->types, fp);
1440 if (rc)
1441 goto bad;
1442
1443 if (strcmp(key, OBJECT_R) == 0) {
1444 rc = -EINVAL;
1445 if (role->value != OBJECT_R_VAL) {
1446 printk(KERN_ERR "SELinux: Role %s has wrong value %d\n",
1447 OBJECT_R, role->value);
1448 goto bad;
1449 }
1450 rc = 0;
1451 goto bad;
1452 }
1453
1454 rc = hashtab_insert(h, key, role);
1455 if (rc)
1456 goto bad;
1457 return 0;
1458bad:
1459 role_destroy(key, role, NULL);
1460 return rc;
1461}
1462
1463static int type_read(struct policydb *p, struct hashtab *h, void *fp)
1464{
1465 char *key = NULL;
1466 struct type_datum *typdatum;
1467 int rc, to_read = 3;
1468 __le32 buf[4];
1469 u32 len;
1470
1471 rc = -ENOMEM;
1472 typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL);
1473 if (!typdatum)
1474 goto bad;
1475
1476 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1477 to_read = 4;
1478
1479 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1480 if (rc)
1481 goto bad;
1482
1483 len = le32_to_cpu(buf[0]);
1484 typdatum->value = le32_to_cpu(buf[1]);
1485 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
1486 u32 prop = le32_to_cpu(buf[2]);
1487
1488 if (prop & TYPEDATUM_PROPERTY_PRIMARY)
1489 typdatum->primary = 1;
1490 if (prop & TYPEDATUM_PROPERTY_ATTRIBUTE)
1491 typdatum->attribute = 1;
1492
1493 typdatum->bounds = le32_to_cpu(buf[3]);
1494 } else {
1495 typdatum->primary = le32_to_cpu(buf[2]);
1496 }
1497
1498 rc = str_read(&key, GFP_KERNEL, fp, len);
1499 if (rc)
1500 goto bad;
1501
1502 rc = hashtab_insert(h, key, typdatum);
1503 if (rc)
1504 goto bad;
1505 return 0;
1506bad:
1507 type_destroy(key, typdatum, NULL);
1508 return rc;
1509}
1510
1511
1512/*
1513 * Read a MLS level structure from a policydb binary
1514 * representation file.
1515 */
1516static int mls_read_level(struct mls_level *lp, void *fp)
1517{
1518 __le32 buf[1];
1519 int rc;
1520
1521 memset(lp, 0, sizeof(*lp));
1522
1523 rc = next_entry(buf, fp, sizeof buf);
1524 if (rc) {
1525 printk(KERN_ERR "SELinux: mls: truncated level\n");
1526 return rc;
1527 }
1528 lp->sens = le32_to_cpu(buf[0]);
1529
1530 rc = ebitmap_read(&lp->cat, fp);
1531 if (rc) {
1532 printk(KERN_ERR "SELinux: mls: error reading level categories\n");
1533 return rc;
1534 }
1535 return 0;
1536}
1537
1538static int user_read(struct policydb *p, struct hashtab *h, void *fp)
1539{
1540 char *key = NULL;
1541 struct user_datum *usrdatum;
1542 int rc, to_read = 2;
1543 __le32 buf[3];
1544 u32 len;
1545
1546 rc = -ENOMEM;
1547 usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
1548 if (!usrdatum)
1549 goto bad;
1550
1551 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1552 to_read = 3;
1553
1554 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1555 if (rc)
1556 goto bad;
1557
1558 len = le32_to_cpu(buf[0]);
1559 usrdatum->value = le32_to_cpu(buf[1]);
1560 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1561 usrdatum->bounds = le32_to_cpu(buf[2]);
1562
1563 rc = str_read(&key, GFP_KERNEL, fp, len);
1564 if (rc)
1565 goto bad;
1566
1567 rc = ebitmap_read(&usrdatum->roles, fp);
1568 if (rc)
1569 goto bad;
1570
1571 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1572 rc = mls_read_range_helper(&usrdatum->range, fp);
1573 if (rc)
1574 goto bad;
1575 rc = mls_read_level(&usrdatum->dfltlevel, fp);
1576 if (rc)
1577 goto bad;
1578 }
1579
1580 rc = hashtab_insert(h, key, usrdatum);
1581 if (rc)
1582 goto bad;
1583 return 0;
1584bad:
1585 user_destroy(key, usrdatum, NULL);
1586 return rc;
1587}
1588
1589static int sens_read(struct policydb *p, struct hashtab *h, void *fp)
1590{
1591 char *key = NULL;
1592 struct level_datum *levdatum;
1593 int rc;
1594 __le32 buf[2];
1595 u32 len;
1596
1597 rc = -ENOMEM;
1598 levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC);
1599 if (!levdatum)
1600 goto bad;
1601
1602 rc = next_entry(buf, fp, sizeof buf);
1603 if (rc)
1604 goto bad;
1605
1606 len = le32_to_cpu(buf[0]);
1607 levdatum->isalias = le32_to_cpu(buf[1]);
1608
1609 rc = str_read(&key, GFP_ATOMIC, fp, len);
1610 if (rc)
1611 goto bad;
1612
1613 rc = -ENOMEM;
1614 levdatum->level = kmalloc(sizeof(struct mls_level), GFP_ATOMIC);
1615 if (!levdatum->level)
1616 goto bad;
1617
1618 rc = mls_read_level(levdatum->level, fp);
1619 if (rc)
1620 goto bad;
1621
1622 rc = hashtab_insert(h, key, levdatum);
1623 if (rc)
1624 goto bad;
1625 return 0;
1626bad:
1627 sens_destroy(key, levdatum, NULL);
1628 return rc;
1629}
1630
1631static int cat_read(struct policydb *p, struct hashtab *h, void *fp)
1632{
1633 char *key = NULL;
1634 struct cat_datum *catdatum;
1635 int rc;
1636 __le32 buf[3];
1637 u32 len;
1638
1639 rc = -ENOMEM;
1640 catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC);
1641 if (!catdatum)
1642 goto bad;
1643
1644 rc = next_entry(buf, fp, sizeof buf);
1645 if (rc)
1646 goto bad;
1647
1648 len = le32_to_cpu(buf[0]);
1649 catdatum->value = le32_to_cpu(buf[1]);
1650 catdatum->isalias = le32_to_cpu(buf[2]);
1651
1652 rc = str_read(&key, GFP_ATOMIC, fp, len);
1653 if (rc)
1654 goto bad;
1655
1656 rc = hashtab_insert(h, key, catdatum);
1657 if (rc)
1658 goto bad;
1659 return 0;
1660bad:
1661 cat_destroy(key, catdatum, NULL);
1662 return rc;
1663}
1664
1665static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, void *fp) =
1666{
1667 common_read,
1668 class_read,
1669 role_read,
1670 type_read,
1671 user_read,
1672 cond_read_bool,
1673 sens_read,
1674 cat_read,
1675};
1676
1677static int user_bounds_sanity_check(void *key, void *datum, void *datap)
1678{
1679 struct user_datum *upper, *user;
1680 struct policydb *p = datap;
1681 int depth = 0;
1682
1683 upper = user = datum;
1684 while (upper->bounds) {
1685 struct ebitmap_node *node;
1686 unsigned long bit;
1687
1688 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1689 printk(KERN_ERR "SELinux: user %s: "
1690 "too deep or looped boundary",
1691 (char *) key);
1692 return -EINVAL;
1693 }
1694
1695 upper = p->user_val_to_struct[upper->bounds - 1];
1696 ebitmap_for_each_positive_bit(&user->roles, node, bit) {
1697 if (ebitmap_get_bit(&upper->roles, bit))
1698 continue;
1699
1700 printk(KERN_ERR
1701 "SELinux: boundary violated policy: "
1702 "user=%s role=%s bounds=%s\n",
1703 sym_name(p, SYM_USERS, user->value - 1),
1704 sym_name(p, SYM_ROLES, bit),
1705 sym_name(p, SYM_USERS, upper->value - 1));
1706
1707 return -EINVAL;
1708 }
1709 }
1710
1711 return 0;
1712}
1713
1714static int role_bounds_sanity_check(void *key, void *datum, void *datap)
1715{
1716 struct role_datum *upper, *role;
1717 struct policydb *p = datap;
1718 int depth = 0;
1719
1720 upper = role = datum;
1721 while (upper->bounds) {
1722 struct ebitmap_node *node;
1723 unsigned long bit;
1724
1725 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1726 printk(KERN_ERR "SELinux: role %s: "
1727 "too deep or looped bounds\n",
1728 (char *) key);
1729 return -EINVAL;
1730 }
1731
1732 upper = p->role_val_to_struct[upper->bounds - 1];
1733 ebitmap_for_each_positive_bit(&role->types, node, bit) {
1734 if (ebitmap_get_bit(&upper->types, bit))
1735 continue;
1736
1737 printk(KERN_ERR
1738 "SELinux: boundary violated policy: "
1739 "role=%s type=%s bounds=%s\n",
1740 sym_name(p, SYM_ROLES, role->value - 1),
1741 sym_name(p, SYM_TYPES, bit),
1742 sym_name(p, SYM_ROLES, upper->value - 1));
1743
1744 return -EINVAL;
1745 }
1746 }
1747
1748 return 0;
1749}
1750
1751static int type_bounds_sanity_check(void *key, void *datum, void *datap)
1752{
1753 struct type_datum *upper;
1754 struct policydb *p = datap;
1755 int depth = 0;
1756
1757 upper = datum;
1758 while (upper->bounds) {
1759 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1760 printk(KERN_ERR "SELinux: type %s: "
1761 "too deep or looped boundary\n",
1762 (char *) key);
1763 return -EINVAL;
1764 }
1765
1766 upper = flex_array_get_ptr(p->type_val_to_struct_array,
1767 upper->bounds - 1);
1768 BUG_ON(!upper);
1769
1770 if (upper->attribute) {
1771 printk(KERN_ERR "SELinux: type %s: "
1772 "bounded by attribute %s",
1773 (char *) key,
1774 sym_name(p, SYM_TYPES, upper->value - 1));
1775 return -EINVAL;
1776 }
1777 }
1778
1779 return 0;
1780}
1781
1782static int policydb_bounds_sanity_check(struct policydb *p)
1783{
1784 int rc;
1785
1786 if (p->policyvers < POLICYDB_VERSION_BOUNDARY)
1787 return 0;
1788
1789 rc = hashtab_map(p->p_users.table,
1790 user_bounds_sanity_check, p);
1791 if (rc)
1792 return rc;
1793
1794 rc = hashtab_map(p->p_roles.table,
1795 role_bounds_sanity_check, p);
1796 if (rc)
1797 return rc;
1798
1799 rc = hashtab_map(p->p_types.table,
1800 type_bounds_sanity_check, p);
1801 if (rc)
1802 return rc;
1803
1804 return 0;
1805}
1806
1807u16 string_to_security_class(struct policydb *p, const char *name)
1808{
1809 struct class_datum *cladatum;
1810
1811 cladatum = hashtab_search(p->p_classes.table, name);
1812 if (!cladatum)
1813 return 0;
1814
1815 return cladatum->value;
1816}
1817
1818u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name)
1819{
1820 struct class_datum *cladatum;
1821 struct perm_datum *perdatum = NULL;
1822 struct common_datum *comdatum;
1823
1824 if (!tclass || tclass > p->p_classes.nprim)
1825 return 0;
1826
1827 cladatum = p->class_val_to_struct[tclass-1];
1828 comdatum = cladatum->comdatum;
1829 if (comdatum)
1830 perdatum = hashtab_search(comdatum->permissions.table,
1831 name);
1832 if (!perdatum)
1833 perdatum = hashtab_search(cladatum->permissions.table,
1834 name);
1835 if (!perdatum)
1836 return 0;
1837
1838 return 1U << (perdatum->value-1);
1839}
1840
1841static int range_read(struct policydb *p, void *fp)
1842{
1843 struct range_trans *rt = NULL;
1844 struct mls_range *r = NULL;
1845 int i, rc;
1846 __le32 buf[2];
1847 u32 nel;
1848
1849 if (p->policyvers < POLICYDB_VERSION_MLS)
1850 return 0;
1851
1852 rc = next_entry(buf, fp, sizeof(u32));
1853 if (rc)
1854 goto out;
1855
1856 nel = le32_to_cpu(buf[0]);
1857 for (i = 0; i < nel; i++) {
1858 rc = -ENOMEM;
1859 rt = kzalloc(sizeof(*rt), GFP_KERNEL);
1860 if (!rt)
1861 goto out;
1862
1863 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1864 if (rc)
1865 goto out;
1866
1867 rt->source_type = le32_to_cpu(buf[0]);
1868 rt->target_type = le32_to_cpu(buf[1]);
1869 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
1870 rc = next_entry(buf, fp, sizeof(u32));
1871 if (rc)
1872 goto out;
1873 rt->target_class = le32_to_cpu(buf[0]);
1874 } else
1875 rt->target_class = p->process_class;
1876
1877 rc = -EINVAL;
1878 if (!policydb_type_isvalid(p, rt->source_type) ||
1879 !policydb_type_isvalid(p, rt->target_type) ||
1880 !policydb_class_isvalid(p, rt->target_class))
1881 goto out;
1882
1883 rc = -ENOMEM;
1884 r = kzalloc(sizeof(*r), GFP_KERNEL);
1885 if (!r)
1886 goto out;
1887
1888 rc = mls_read_range_helper(r, fp);
1889 if (rc)
1890 goto out;
1891
1892 rc = -EINVAL;
1893 if (!mls_range_isvalid(p, r)) {
1894 printk(KERN_WARNING "SELinux: rangetrans: invalid range\n");
1895 goto out;
1896 }
1897
1898 rc = hashtab_insert(p->range_tr, rt, r);
1899 if (rc)
1900 goto out;
1901
1902 rt = NULL;
1903 r = NULL;
1904 }
1905 hash_eval(p->range_tr, "rangetr");
1906 rc = 0;
1907out:
1908 kfree(rt);
1909 kfree(r);
1910 return rc;
1911}
1912
1913static int filename_trans_read(struct policydb *p, void *fp)
1914{
1915 struct filename_trans *ft;
1916 struct filename_trans_datum *otype;
1917 char *name;
1918 u32 nel, len;
1919 __le32 buf[4];
1920 int rc, i;
1921
1922 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
1923 return 0;
1924
1925 rc = next_entry(buf, fp, sizeof(u32));
1926 if (rc)
1927 return rc;
1928 nel = le32_to_cpu(buf[0]);
1929
1930 for (i = 0; i < nel; i++) {
1931 ft = NULL;
1932 otype = NULL;
1933 name = NULL;
1934
1935 rc = -ENOMEM;
1936 ft = kzalloc(sizeof(*ft), GFP_KERNEL);
1937 if (!ft)
1938 goto out;
1939
1940 rc = -ENOMEM;
1941 otype = kmalloc(sizeof(*otype), GFP_KERNEL);
1942 if (!otype)
1943 goto out;
1944
1945 /* length of the path component string */
1946 rc = next_entry(buf, fp, sizeof(u32));
1947 if (rc)
1948 goto out;
1949 len = le32_to_cpu(buf[0]);
1950
1951 /* path component string */
1952 rc = str_read(&name, GFP_KERNEL, fp, len);
1953 if (rc)
1954 goto out;
1955
1956 ft->name = name;
1957
1958 rc = next_entry(buf, fp, sizeof(u32) * 4);
1959 if (rc)
1960 goto out;
1961
1962 ft->stype = le32_to_cpu(buf[0]);
1963 ft->ttype = le32_to_cpu(buf[1]);
1964 ft->tclass = le32_to_cpu(buf[2]);
1965
1966 otype->otype = le32_to_cpu(buf[3]);
1967
1968 rc = ebitmap_set_bit(&p->filename_trans_ttypes, ft->ttype, 1);
1969 if (rc)
1970 goto out;
1971
1972 rc = hashtab_insert(p->filename_trans, ft, otype);
1973 if (rc) {
1974 /*
1975 * Do not return -EEXIST to the caller, or the system
1976 * will not boot.
1977 */
1978 if (rc != -EEXIST)
1979 goto out;
1980 /* But free memory to avoid memory leak. */
1981 kfree(ft);
1982 kfree(name);
1983 kfree(otype);
1984 }
1985 }
1986 hash_eval(p->filename_trans, "filenametr");
1987 return 0;
1988out:
1989 kfree(ft);
1990 kfree(name);
1991 kfree(otype);
1992
1993 return rc;
1994}
1995
1996static int genfs_read(struct policydb *p, void *fp)
1997{
1998 int i, j, rc;
1999 u32 nel, nel2, len, len2;
2000 __le32 buf[1];
2001 struct ocontext *l, *c;
2002 struct ocontext *newc = NULL;
2003 struct genfs *genfs_p, *genfs;
2004 struct genfs *newgenfs = NULL;
2005
2006 rc = next_entry(buf, fp, sizeof(u32));
2007 if (rc)
2008 goto out;
2009 nel = le32_to_cpu(buf[0]);
2010
2011 for (i = 0; i < nel; i++) {
2012 rc = next_entry(buf, fp, sizeof(u32));
2013 if (rc)
2014 goto out;
2015 len = le32_to_cpu(buf[0]);
2016
2017 rc = -ENOMEM;
2018 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
2019 if (!newgenfs)
2020 goto out;
2021
2022 rc = str_read(&newgenfs->fstype, GFP_KERNEL, fp, len);
2023 if (rc)
2024 goto out;
2025
2026 for (genfs_p = NULL, genfs = p->genfs; genfs;
2027 genfs_p = genfs, genfs = genfs->next) {
2028 rc = -EINVAL;
2029 if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
2030 printk(KERN_ERR "SELinux: dup genfs fstype %s\n",
2031 newgenfs->fstype);
2032 goto out;
2033 }
2034 if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
2035 break;
2036 }
2037 newgenfs->next = genfs;
2038 if (genfs_p)
2039 genfs_p->next = newgenfs;
2040 else
2041 p->genfs = newgenfs;
2042 genfs = newgenfs;
2043 newgenfs = NULL;
2044
2045 rc = next_entry(buf, fp, sizeof(u32));
2046 if (rc)
2047 goto out;
2048
2049 nel2 = le32_to_cpu(buf[0]);
2050 for (j = 0; j < nel2; j++) {
2051 rc = next_entry(buf, fp, sizeof(u32));
2052 if (rc)
2053 goto out;
2054 len = le32_to_cpu(buf[0]);
2055
2056 rc = -ENOMEM;
2057 newc = kzalloc(sizeof(*newc), GFP_KERNEL);
2058 if (!newc)
2059 goto out;
2060
2061 rc = str_read(&newc->u.name, GFP_KERNEL, fp, len);
2062 if (rc)
2063 goto out;
2064
2065 rc = next_entry(buf, fp, sizeof(u32));
2066 if (rc)
2067 goto out;
2068
2069 newc->v.sclass = le32_to_cpu(buf[0]);
2070 rc = context_read_and_validate(&newc->context[0], p, fp);
2071 if (rc)
2072 goto out;
2073
2074 for (l = NULL, c = genfs->head; c;
2075 l = c, c = c->next) {
2076 rc = -EINVAL;
2077 if (!strcmp(newc->u.name, c->u.name) &&
2078 (!c->v.sclass || !newc->v.sclass ||
2079 newc->v.sclass == c->v.sclass)) {
2080 printk(KERN_ERR "SELinux: dup genfs entry (%s,%s)\n",
2081 genfs->fstype, c->u.name);
2082 goto out;
2083 }
2084 len = strlen(newc->u.name);
2085 len2 = strlen(c->u.name);
2086 if (len > len2)
2087 break;
2088 }
2089
2090 newc->next = c;
2091 if (l)
2092 l->next = newc;
2093 else
2094 genfs->head = newc;
2095 newc = NULL;
2096 }
2097 }
2098 rc = 0;
2099out:
2100 if (newgenfs)
2101 kfree(newgenfs->fstype);
2102 kfree(newgenfs);
2103 ocontext_destroy(newc, OCON_FSUSE);
2104
2105 return rc;
2106}
2107
2108static int ocontext_read(struct policydb *p, struct policydb_compat_info *info,
2109 void *fp)
2110{
2111 int i, j, rc;
2112 u32 nel, len;
2113 __le32 buf[3];
2114 struct ocontext *l, *c;
2115 u32 nodebuf[8];
2116
2117 for (i = 0; i < info->ocon_num; i++) {
2118 rc = next_entry(buf, fp, sizeof(u32));
2119 if (rc)
2120 goto out;
2121 nel = le32_to_cpu(buf[0]);
2122
2123 l = NULL;
2124 for (j = 0; j < nel; j++) {
2125 rc = -ENOMEM;
2126 c = kzalloc(sizeof(*c), GFP_KERNEL);
2127 if (!c)
2128 goto out;
2129 if (l)
2130 l->next = c;
2131 else
2132 p->ocontexts[i] = c;
2133 l = c;
2134
2135 switch (i) {
2136 case OCON_ISID:
2137 rc = next_entry(buf, fp, sizeof(u32));
2138 if (rc)
2139 goto out;
2140
2141 c->sid[0] = le32_to_cpu(buf[0]);
2142 rc = context_read_and_validate(&c->context[0], p, fp);
2143 if (rc)
2144 goto out;
2145 break;
2146 case OCON_FS:
2147 case OCON_NETIF:
2148 rc = next_entry(buf, fp, sizeof(u32));
2149 if (rc)
2150 goto out;
2151 len = le32_to_cpu(buf[0]);
2152
2153 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2154 if (rc)
2155 goto out;
2156
2157 rc = context_read_and_validate(&c->context[0], p, fp);
2158 if (rc)
2159 goto out;
2160 rc = context_read_and_validate(&c->context[1], p, fp);
2161 if (rc)
2162 goto out;
2163 break;
2164 case OCON_PORT:
2165 rc = next_entry(buf, fp, sizeof(u32)*3);
2166 if (rc)
2167 goto out;
2168 c->u.port.protocol = le32_to_cpu(buf[0]);
2169 c->u.port.low_port = le32_to_cpu(buf[1]);
2170 c->u.port.high_port = le32_to_cpu(buf[2]);
2171 rc = context_read_and_validate(&c->context[0], p, fp);
2172 if (rc)
2173 goto out;
2174 break;
2175 case OCON_NODE:
2176 rc = next_entry(nodebuf, fp, sizeof(u32) * 2);
2177 if (rc)
2178 goto out;
2179 c->u.node.addr = nodebuf[0]; /* network order */
2180 c->u.node.mask = nodebuf[1]; /* network order */
2181 rc = context_read_and_validate(&c->context[0], p, fp);
2182 if (rc)
2183 goto out;
2184 break;
2185 case OCON_FSUSE:
2186 rc = next_entry(buf, fp, sizeof(u32)*2);
2187 if (rc)
2188 goto out;
2189
2190 rc = -EINVAL;
2191 c->v.behavior = le32_to_cpu(buf[0]);
2192 /* Determined at runtime, not in policy DB. */
2193 if (c->v.behavior == SECURITY_FS_USE_MNTPOINT)
2194 goto out;
2195 if (c->v.behavior > SECURITY_FS_USE_MAX)
2196 goto out;
2197
2198 len = le32_to_cpu(buf[1]);
2199 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2200 if (rc)
2201 goto out;
2202
2203 rc = context_read_and_validate(&c->context[0], p, fp);
2204 if (rc)
2205 goto out;
2206 break;
2207 case OCON_NODE6: {
2208 int k;
2209
2210 rc = next_entry(nodebuf, fp, sizeof(u32) * 8);
2211 if (rc)
2212 goto out;
2213 for (k = 0; k < 4; k++)
2214 c->u.node6.addr[k] = nodebuf[k];
2215 for (k = 0; k < 4; k++)
2216 c->u.node6.mask[k] = nodebuf[k+4];
2217 rc = context_read_and_validate(&c->context[0], p, fp);
2218 if (rc)
2219 goto out;
2220 break;
2221 }
2222 }
2223 }
2224 }
2225 rc = 0;
2226out:
2227 return rc;
2228}
2229
2230/*
2231 * Read the configuration data from a policy database binary
2232 * representation file into a policy database structure.
2233 */
2234int policydb_read(struct policydb *p, void *fp)
2235{
2236 struct role_allow *ra, *lra;
2237 struct role_trans *tr, *ltr;
2238 int i, j, rc;
2239 __le32 buf[4];
2240 u32 len, nprim, nel;
2241
2242 char *policydb_str;
2243 struct policydb_compat_info *info;
2244
2245 rc = policydb_init(p);
2246 if (rc)
2247 return rc;
2248
2249 /* Read the magic number and string length. */
2250 rc = next_entry(buf, fp, sizeof(u32) * 2);
2251 if (rc)
2252 goto bad;
2253
2254 rc = -EINVAL;
2255 if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
2256 printk(KERN_ERR "SELinux: policydb magic number 0x%x does "
2257 "not match expected magic number 0x%x\n",
2258 le32_to_cpu(buf[0]), POLICYDB_MAGIC);
2259 goto bad;
2260 }
2261
2262 rc = -EINVAL;
2263 len = le32_to_cpu(buf[1]);
2264 if (len != strlen(POLICYDB_STRING)) {
2265 printk(KERN_ERR "SELinux: policydb string length %d does not "
2266 "match expected length %Zu\n",
2267 len, strlen(POLICYDB_STRING));
2268 goto bad;
2269 }
2270
2271 rc = -ENOMEM;
2272 policydb_str = kmalloc(len + 1, GFP_KERNEL);
2273 if (!policydb_str) {
2274 printk(KERN_ERR "SELinux: unable to allocate memory for policydb "
2275 "string of length %d\n", len);
2276 goto bad;
2277 }
2278
2279 rc = next_entry(policydb_str, fp, len);
2280 if (rc) {
2281 printk(KERN_ERR "SELinux: truncated policydb string identifier\n");
2282 kfree(policydb_str);
2283 goto bad;
2284 }
2285
2286 rc = -EINVAL;
2287 policydb_str[len] = '\0';
2288 if (strcmp(policydb_str, POLICYDB_STRING)) {
2289 printk(KERN_ERR "SELinux: policydb string %s does not match "
2290 "my string %s\n", policydb_str, POLICYDB_STRING);
2291 kfree(policydb_str);
2292 goto bad;
2293 }
2294 /* Done with policydb_str. */
2295 kfree(policydb_str);
2296 policydb_str = NULL;
2297
2298 /* Read the version and table sizes. */
2299 rc = next_entry(buf, fp, sizeof(u32)*4);
2300 if (rc)
2301 goto bad;
2302
2303 rc = -EINVAL;
2304 p->policyvers = le32_to_cpu(buf[0]);
2305 if (p->policyvers < POLICYDB_VERSION_MIN ||
2306 p->policyvers > POLICYDB_VERSION_MAX) {
2307 printk(KERN_ERR "SELinux: policydb version %d does not match "
2308 "my version range %d-%d\n",
2309 le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
2310 goto bad;
2311 }
2312
2313 if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
2314 p->mls_enabled = 1;
2315
2316 rc = -EINVAL;
2317 if (p->policyvers < POLICYDB_VERSION_MLS) {
2318 printk(KERN_ERR "SELinux: security policydb version %d "
2319 "(MLS) not backwards compatible\n",
2320 p->policyvers);
2321 goto bad;
2322 }
2323 }
2324 p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
2325 p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
2326
2327 if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
2328 rc = ebitmap_read(&p->policycaps, fp);
2329 if (rc)
2330 goto bad;
2331 }
2332
2333 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
2334 rc = ebitmap_read(&p->permissive_map, fp);
2335 if (rc)
2336 goto bad;
2337 }
2338
2339 rc = -EINVAL;
2340 info = policydb_lookup_compat(p->policyvers);
2341 if (!info) {
2342 printk(KERN_ERR "SELinux: unable to find policy compat info "
2343 "for version %d\n", p->policyvers);
2344 goto bad;
2345 }
2346
2347 rc = -EINVAL;
2348 if (le32_to_cpu(buf[2]) != info->sym_num ||
2349 le32_to_cpu(buf[3]) != info->ocon_num) {
2350 printk(KERN_ERR "SELinux: policydb table sizes (%d,%d) do "
2351 "not match mine (%d,%d)\n", le32_to_cpu(buf[2]),
2352 le32_to_cpu(buf[3]),
2353 info->sym_num, info->ocon_num);
2354 goto bad;
2355 }
2356
2357 for (i = 0; i < info->sym_num; i++) {
2358 rc = next_entry(buf, fp, sizeof(u32)*2);
2359 if (rc)
2360 goto bad;
2361 nprim = le32_to_cpu(buf[0]);
2362 nel = le32_to_cpu(buf[1]);
2363 for (j = 0; j < nel; j++) {
2364 rc = read_f[i](p, p->symtab[i].table, fp);
2365 if (rc)
2366 goto bad;
2367 }
2368
2369 p->symtab[i].nprim = nprim;
2370 }
2371
2372 rc = -EINVAL;
2373 p->process_class = string_to_security_class(p, "process");
2374 if (!p->process_class)
2375 goto bad;
2376
2377 rc = avtab_read(&p->te_avtab, fp, p);
2378 if (rc)
2379 goto bad;
2380
2381 if (p->policyvers >= POLICYDB_VERSION_BOOL) {
2382 rc = cond_read_list(p, fp);
2383 if (rc)
2384 goto bad;
2385 }
2386
2387 rc = next_entry(buf, fp, sizeof(u32));
2388 if (rc)
2389 goto bad;
2390 nel = le32_to_cpu(buf[0]);
2391 ltr = NULL;
2392 for (i = 0; i < nel; i++) {
2393 rc = -ENOMEM;
2394 tr = kzalloc(sizeof(*tr), GFP_KERNEL);
2395 if (!tr)
2396 goto bad;
2397 if (ltr)
2398 ltr->next = tr;
2399 else
2400 p->role_tr = tr;
2401 rc = next_entry(buf, fp, sizeof(u32)*3);
2402 if (rc)
2403 goto bad;
2404
2405 rc = -EINVAL;
2406 tr->role = le32_to_cpu(buf[0]);
2407 tr->type = le32_to_cpu(buf[1]);
2408 tr->new_role = le32_to_cpu(buf[2]);
2409 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2410 rc = next_entry(buf, fp, sizeof(u32));
2411 if (rc)
2412 goto bad;
2413 tr->tclass = le32_to_cpu(buf[0]);
2414 } else
2415 tr->tclass = p->process_class;
2416
2417 if (!policydb_role_isvalid(p, tr->role) ||
2418 !policydb_type_isvalid(p, tr->type) ||
2419 !policydb_class_isvalid(p, tr->tclass) ||
2420 !policydb_role_isvalid(p, tr->new_role))
2421 goto bad;
2422 ltr = tr;
2423 }
2424
2425 rc = next_entry(buf, fp, sizeof(u32));
2426 if (rc)
2427 goto bad;
2428 nel = le32_to_cpu(buf[0]);
2429 lra = NULL;
2430 for (i = 0; i < nel; i++) {
2431 rc = -ENOMEM;
2432 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
2433 if (!ra)
2434 goto bad;
2435 if (lra)
2436 lra->next = ra;
2437 else
2438 p->role_allow = ra;
2439 rc = next_entry(buf, fp, sizeof(u32)*2);
2440 if (rc)
2441 goto bad;
2442
2443 rc = -EINVAL;
2444 ra->role = le32_to_cpu(buf[0]);
2445 ra->new_role = le32_to_cpu(buf[1]);
2446 if (!policydb_role_isvalid(p, ra->role) ||
2447 !policydb_role_isvalid(p, ra->new_role))
2448 goto bad;
2449 lra = ra;
2450 }
2451
2452 rc = filename_trans_read(p, fp);
2453 if (rc)
2454 goto bad;
2455
2456 rc = policydb_index(p);
2457 if (rc)
2458 goto bad;
2459
2460 rc = -EINVAL;
2461 p->process_trans_perms = string_to_av_perm(p, p->process_class, "transition");
2462 p->process_trans_perms |= string_to_av_perm(p, p->process_class, "dyntransition");
2463 if (!p->process_trans_perms)
2464 goto bad;
2465
2466 rc = ocontext_read(p, info, fp);
2467 if (rc)
2468 goto bad;
2469
2470 rc = genfs_read(p, fp);
2471 if (rc)
2472 goto bad;
2473
2474 rc = range_read(p, fp);
2475 if (rc)
2476 goto bad;
2477
2478 rc = -ENOMEM;
2479 p->type_attr_map_array = flex_array_alloc(sizeof(struct ebitmap),
2480 p->p_types.nprim,
2481 GFP_KERNEL | __GFP_ZERO);
2482 if (!p->type_attr_map_array)
2483 goto bad;
2484
2485 /* preallocate so we don't have to worry about the put ever failing */
2486 rc = flex_array_prealloc(p->type_attr_map_array, 0, p->p_types.nprim,
2487 GFP_KERNEL | __GFP_ZERO);
2488 if (rc)
2489 goto bad;
2490
2491 for (i = 0; i < p->p_types.nprim; i++) {
2492 struct ebitmap *e = flex_array_get(p->type_attr_map_array, i);
2493
2494 BUG_ON(!e);
2495 ebitmap_init(e);
2496 if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
2497 rc = ebitmap_read(e, fp);
2498 if (rc)
2499 goto bad;
2500 }
2501 /* add the type itself as the degenerate case */
2502 rc = ebitmap_set_bit(e, i, 1);
2503 if (rc)
2504 goto bad;
2505 }
2506
2507 rc = policydb_bounds_sanity_check(p);
2508 if (rc)
2509 goto bad;
2510
2511 rc = 0;
2512out:
2513 return rc;
2514bad:
2515 policydb_destroy(p);
2516 goto out;
2517}
2518
2519/*
2520 * Write a MLS level structure to a policydb binary
2521 * representation file.
2522 */
2523static int mls_write_level(struct mls_level *l, void *fp)
2524{
2525 __le32 buf[1];
2526 int rc;
2527
2528 buf[0] = cpu_to_le32(l->sens);
2529 rc = put_entry(buf, sizeof(u32), 1, fp);
2530 if (rc)
2531 return rc;
2532
2533 rc = ebitmap_write(&l->cat, fp);
2534 if (rc)
2535 return rc;
2536
2537 return 0;
2538}
2539
2540/*
2541 * Write a MLS range structure to a policydb binary
2542 * representation file.
2543 */
2544static int mls_write_range_helper(struct mls_range *r, void *fp)
2545{
2546 __le32 buf[3];
2547 size_t items;
2548 int rc, eq;
2549
2550 eq = mls_level_eq(&r->level[1], &r->level[0]);
2551
2552 if (eq)
2553 items = 2;
2554 else
2555 items = 3;
2556 buf[0] = cpu_to_le32(items-1);
2557 buf[1] = cpu_to_le32(r->level[0].sens);
2558 if (!eq)
2559 buf[2] = cpu_to_le32(r->level[1].sens);
2560
2561 BUG_ON(items > ARRAY_SIZE(buf));
2562
2563 rc = put_entry(buf, sizeof(u32), items, fp);
2564 if (rc)
2565 return rc;
2566
2567 rc = ebitmap_write(&r->level[0].cat, fp);
2568 if (rc)
2569 return rc;
2570 if (!eq) {
2571 rc = ebitmap_write(&r->level[1].cat, fp);
2572 if (rc)
2573 return rc;
2574 }
2575
2576 return 0;
2577}
2578
2579static int sens_write(void *vkey, void *datum, void *ptr)
2580{
2581 char *key = vkey;
2582 struct level_datum *levdatum = datum;
2583 struct policy_data *pd = ptr;
2584 void *fp = pd->fp;
2585 __le32 buf[2];
2586 size_t len;
2587 int rc;
2588
2589 len = strlen(key);
2590 buf[0] = cpu_to_le32(len);
2591 buf[1] = cpu_to_le32(levdatum->isalias);
2592 rc = put_entry(buf, sizeof(u32), 2, fp);
2593 if (rc)
2594 return rc;
2595
2596 rc = put_entry(key, 1, len, fp);
2597 if (rc)
2598 return rc;
2599
2600 rc = mls_write_level(levdatum->level, fp);
2601 if (rc)
2602 return rc;
2603
2604 return 0;
2605}
2606
2607static int cat_write(void *vkey, void *datum, void *ptr)
2608{
2609 char *key = vkey;
2610 struct cat_datum *catdatum = datum;
2611 struct policy_data *pd = ptr;
2612 void *fp = pd->fp;
2613 __le32 buf[3];
2614 size_t len;
2615 int rc;
2616
2617 len = strlen(key);
2618 buf[0] = cpu_to_le32(len);
2619 buf[1] = cpu_to_le32(catdatum->value);
2620 buf[2] = cpu_to_le32(catdatum->isalias);
2621 rc = put_entry(buf, sizeof(u32), 3, fp);
2622 if (rc)
2623 return rc;
2624
2625 rc = put_entry(key, 1, len, fp);
2626 if (rc)
2627 return rc;
2628
2629 return 0;
2630}
2631
2632static int role_trans_write(struct policydb *p, void *fp)
2633{
2634 struct role_trans *r = p->role_tr;
2635 struct role_trans *tr;
2636 u32 buf[3];
2637 size_t nel;
2638 int rc;
2639
2640 nel = 0;
2641 for (tr = r; tr; tr = tr->next)
2642 nel++;
2643 buf[0] = cpu_to_le32(nel);
2644 rc = put_entry(buf, sizeof(u32), 1, fp);
2645 if (rc)
2646 return rc;
2647 for (tr = r; tr; tr = tr->next) {
2648 buf[0] = cpu_to_le32(tr->role);
2649 buf[1] = cpu_to_le32(tr->type);
2650 buf[2] = cpu_to_le32(tr->new_role);
2651 rc = put_entry(buf, sizeof(u32), 3, fp);
2652 if (rc)
2653 return rc;
2654 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2655 buf[0] = cpu_to_le32(tr->tclass);
2656 rc = put_entry(buf, sizeof(u32), 1, fp);
2657 if (rc)
2658 return rc;
2659 }
2660 }
2661
2662 return 0;
2663}
2664
2665static int role_allow_write(struct role_allow *r, void *fp)
2666{
2667 struct role_allow *ra;
2668 u32 buf[2];
2669 size_t nel;
2670 int rc;
2671
2672 nel = 0;
2673 for (ra = r; ra; ra = ra->next)
2674 nel++;
2675 buf[0] = cpu_to_le32(nel);
2676 rc = put_entry(buf, sizeof(u32), 1, fp);
2677 if (rc)
2678 return rc;
2679 for (ra = r; ra; ra = ra->next) {
2680 buf[0] = cpu_to_le32(ra->role);
2681 buf[1] = cpu_to_le32(ra->new_role);
2682 rc = put_entry(buf, sizeof(u32), 2, fp);
2683 if (rc)
2684 return rc;
2685 }
2686 return 0;
2687}
2688
2689/*
2690 * Write a security context structure
2691 * to a policydb binary representation file.
2692 */
2693static int context_write(struct policydb *p, struct context *c,
2694 void *fp)
2695{
2696 int rc;
2697 __le32 buf[3];
2698
2699 buf[0] = cpu_to_le32(c->user);
2700 buf[1] = cpu_to_le32(c->role);
2701 buf[2] = cpu_to_le32(c->type);
2702
2703 rc = put_entry(buf, sizeof(u32), 3, fp);
2704 if (rc)
2705 return rc;
2706
2707 rc = mls_write_range_helper(&c->range, fp);
2708 if (rc)
2709 return rc;
2710
2711 return 0;
2712}
2713
2714/*
2715 * The following *_write functions are used to
2716 * write the symbol data to a policy database
2717 * binary representation file.
2718 */
2719
2720static int perm_write(void *vkey, void *datum, void *fp)
2721{
2722 char *key = vkey;
2723 struct perm_datum *perdatum = datum;
2724 __le32 buf[2];
2725 size_t len;
2726 int rc;
2727
2728 len = strlen(key);
2729 buf[0] = cpu_to_le32(len);
2730 buf[1] = cpu_to_le32(perdatum->value);
2731 rc = put_entry(buf, sizeof(u32), 2, fp);
2732 if (rc)
2733 return rc;
2734
2735 rc = put_entry(key, 1, len, fp);
2736 if (rc)
2737 return rc;
2738
2739 return 0;
2740}
2741
2742static int common_write(void *vkey, void *datum, void *ptr)
2743{
2744 char *key = vkey;
2745 struct common_datum *comdatum = datum;
2746 struct policy_data *pd = ptr;
2747 void *fp = pd->fp;
2748 __le32 buf[4];
2749 size_t len;
2750 int rc;
2751
2752 len = strlen(key);
2753 buf[0] = cpu_to_le32(len);
2754 buf[1] = cpu_to_le32(comdatum->value);
2755 buf[2] = cpu_to_le32(comdatum->permissions.nprim);
2756 buf[3] = cpu_to_le32(comdatum->permissions.table->nel);
2757 rc = put_entry(buf, sizeof(u32), 4, fp);
2758 if (rc)
2759 return rc;
2760
2761 rc = put_entry(key, 1, len, fp);
2762 if (rc)
2763 return rc;
2764
2765 rc = hashtab_map(comdatum->permissions.table, perm_write, fp);
2766 if (rc)
2767 return rc;
2768
2769 return 0;
2770}
2771
2772static int type_set_write(struct type_set *t, void *fp)
2773{
2774 int rc;
2775 __le32 buf[1];
2776
2777 if (ebitmap_write(&t->types, fp))
2778 return -EINVAL;
2779 if (ebitmap_write(&t->negset, fp))
2780 return -EINVAL;
2781
2782 buf[0] = cpu_to_le32(t->flags);
2783 rc = put_entry(buf, sizeof(u32), 1, fp);
2784 if (rc)
2785 return -EINVAL;
2786
2787 return 0;
2788}
2789
2790static int write_cons_helper(struct policydb *p, struct constraint_node *node,
2791 void *fp)
2792{
2793 struct constraint_node *c;
2794 struct constraint_expr *e;
2795 __le32 buf[3];
2796 u32 nel;
2797 int rc;
2798
2799 for (c = node; c; c = c->next) {
2800 nel = 0;
2801 for (e = c->expr; e; e = e->next)
2802 nel++;
2803 buf[0] = cpu_to_le32(c->permissions);
2804 buf[1] = cpu_to_le32(nel);
2805 rc = put_entry(buf, sizeof(u32), 2, fp);
2806 if (rc)
2807 return rc;
2808 for (e = c->expr; e; e = e->next) {
2809 buf[0] = cpu_to_le32(e->expr_type);
2810 buf[1] = cpu_to_le32(e->attr);
2811 buf[2] = cpu_to_le32(e->op);
2812 rc = put_entry(buf, sizeof(u32), 3, fp);
2813 if (rc)
2814 return rc;
2815
2816 switch (e->expr_type) {
2817 case CEXPR_NAMES:
2818 rc = ebitmap_write(&e->names, fp);
2819 if (rc)
2820 return rc;
2821 if (p->policyvers >=
2822 POLICYDB_VERSION_CONSTRAINT_NAMES) {
2823 rc = type_set_write(e->type_names, fp);
2824 if (rc)
2825 return rc;
2826 }
2827 break;
2828 default:
2829 break;
2830 }
2831 }
2832 }
2833
2834 return 0;
2835}
2836
2837static int class_write(void *vkey, void *datum, void *ptr)
2838{
2839 char *key = vkey;
2840 struct class_datum *cladatum = datum;
2841 struct policy_data *pd = ptr;
2842 void *fp = pd->fp;
2843 struct policydb *p = pd->p;
2844 struct constraint_node *c;
2845 __le32 buf[6];
2846 u32 ncons;
2847 size_t len, len2;
2848 int rc;
2849
2850 len = strlen(key);
2851 if (cladatum->comkey)
2852 len2 = strlen(cladatum->comkey);
2853 else
2854 len2 = 0;
2855
2856 ncons = 0;
2857 for (c = cladatum->constraints; c; c = c->next)
2858 ncons++;
2859
2860 buf[0] = cpu_to_le32(len);
2861 buf[1] = cpu_to_le32(len2);
2862 buf[2] = cpu_to_le32(cladatum->value);
2863 buf[3] = cpu_to_le32(cladatum->permissions.nprim);
2864 if (cladatum->permissions.table)
2865 buf[4] = cpu_to_le32(cladatum->permissions.table->nel);
2866 else
2867 buf[4] = 0;
2868 buf[5] = cpu_to_le32(ncons);
2869 rc = put_entry(buf, sizeof(u32), 6, fp);
2870 if (rc)
2871 return rc;
2872
2873 rc = put_entry(key, 1, len, fp);
2874 if (rc)
2875 return rc;
2876
2877 if (cladatum->comkey) {
2878 rc = put_entry(cladatum->comkey, 1, len2, fp);
2879 if (rc)
2880 return rc;
2881 }
2882
2883 rc = hashtab_map(cladatum->permissions.table, perm_write, fp);
2884 if (rc)
2885 return rc;
2886
2887 rc = write_cons_helper(p, cladatum->constraints, fp);
2888 if (rc)
2889 return rc;
2890
2891 /* write out the validatetrans rule */
2892 ncons = 0;
2893 for (c = cladatum->validatetrans; c; c = c->next)
2894 ncons++;
2895
2896 buf[0] = cpu_to_le32(ncons);
2897 rc = put_entry(buf, sizeof(u32), 1, fp);
2898 if (rc)
2899 return rc;
2900
2901 rc = write_cons_helper(p, cladatum->validatetrans, fp);
2902 if (rc)
2903 return rc;
2904
2905 if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
2906 buf[0] = cpu_to_le32(cladatum->default_user);
2907 buf[1] = cpu_to_le32(cladatum->default_role);
2908 buf[2] = cpu_to_le32(cladatum->default_range);
2909
2910 rc = put_entry(buf, sizeof(uint32_t), 3, fp);
2911 if (rc)
2912 return rc;
2913 }
2914
2915 if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
2916 buf[0] = cpu_to_le32(cladatum->default_type);
2917 rc = put_entry(buf, sizeof(uint32_t), 1, fp);
2918 if (rc)
2919 return rc;
2920 }
2921
2922 return 0;
2923}
2924
2925static int role_write(void *vkey, void *datum, void *ptr)
2926{
2927 char *key = vkey;
2928 struct role_datum *role = datum;
2929 struct policy_data *pd = ptr;
2930 void *fp = pd->fp;
2931 struct policydb *p = pd->p;
2932 __le32 buf[3];
2933 size_t items, len;
2934 int rc;
2935
2936 len = strlen(key);
2937 items = 0;
2938 buf[items++] = cpu_to_le32(len);
2939 buf[items++] = cpu_to_le32(role->value);
2940 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
2941 buf[items++] = cpu_to_le32(role->bounds);
2942
2943 BUG_ON(items > ARRAY_SIZE(buf));
2944
2945 rc = put_entry(buf, sizeof(u32), items, fp);
2946 if (rc)
2947 return rc;
2948
2949 rc = put_entry(key, 1, len, fp);
2950 if (rc)
2951 return rc;
2952
2953 rc = ebitmap_write(&role->dominates, fp);
2954 if (rc)
2955 return rc;
2956
2957 rc = ebitmap_write(&role->types, fp);
2958 if (rc)
2959 return rc;
2960
2961 return 0;
2962}
2963
2964static int type_write(void *vkey, void *datum, void *ptr)
2965{
2966 char *key = vkey;
2967 struct type_datum *typdatum = datum;
2968 struct policy_data *pd = ptr;
2969 struct policydb *p = pd->p;
2970 void *fp = pd->fp;
2971 __le32 buf[4];
2972 int rc;
2973 size_t items, len;
2974
2975 len = strlen(key);
2976 items = 0;
2977 buf[items++] = cpu_to_le32(len);
2978 buf[items++] = cpu_to_le32(typdatum->value);
2979 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
2980 u32 properties = 0;
2981
2982 if (typdatum->primary)
2983 properties |= TYPEDATUM_PROPERTY_PRIMARY;
2984
2985 if (typdatum->attribute)
2986 properties |= TYPEDATUM_PROPERTY_ATTRIBUTE;
2987
2988 buf[items++] = cpu_to_le32(properties);
2989 buf[items++] = cpu_to_le32(typdatum->bounds);
2990 } else {
2991 buf[items++] = cpu_to_le32(typdatum->primary);
2992 }
2993 BUG_ON(items > ARRAY_SIZE(buf));
2994 rc = put_entry(buf, sizeof(u32), items, fp);
2995 if (rc)
2996 return rc;
2997
2998 rc = put_entry(key, 1, len, fp);
2999 if (rc)
3000 return rc;
3001
3002 return 0;
3003}
3004
3005static int user_write(void *vkey, void *datum, void *ptr)
3006{
3007 char *key = vkey;
3008 struct user_datum *usrdatum = datum;
3009 struct policy_data *pd = ptr;
3010 struct policydb *p = pd->p;
3011 void *fp = pd->fp;
3012 __le32 buf[3];
3013 size_t items, len;
3014 int rc;
3015
3016 len = strlen(key);
3017 items = 0;
3018 buf[items++] = cpu_to_le32(len);
3019 buf[items++] = cpu_to_le32(usrdatum->value);
3020 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
3021 buf[items++] = cpu_to_le32(usrdatum->bounds);
3022 BUG_ON(items > ARRAY_SIZE(buf));
3023 rc = put_entry(buf, sizeof(u32), items, fp);
3024 if (rc)
3025 return rc;
3026
3027 rc = put_entry(key, 1, len, fp);
3028 if (rc)
3029 return rc;
3030
3031 rc = ebitmap_write(&usrdatum->roles, fp);
3032 if (rc)
3033 return rc;
3034
3035 rc = mls_write_range_helper(&usrdatum->range, fp);
3036 if (rc)
3037 return rc;
3038
3039 rc = mls_write_level(&usrdatum->dfltlevel, fp);
3040 if (rc)
3041 return rc;
3042
3043 return 0;
3044}
3045
3046static int (*write_f[SYM_NUM]) (void *key, void *datum,
3047 void *datap) =
3048{
3049 common_write,
3050 class_write,
3051 role_write,
3052 type_write,
3053 user_write,
3054 cond_write_bool,
3055 sens_write,
3056 cat_write,
3057};
3058
3059static int ocontext_write(struct policydb *p, struct policydb_compat_info *info,
3060 void *fp)
3061{
3062 unsigned int i, j, rc;
3063 size_t nel, len;
3064 __le32 buf[3];
3065 u32 nodebuf[8];
3066 struct ocontext *c;
3067 for (i = 0; i < info->ocon_num; i++) {
3068 nel = 0;
3069 for (c = p->ocontexts[i]; c; c = c->next)
3070 nel++;
3071 buf[0] = cpu_to_le32(nel);
3072 rc = put_entry(buf, sizeof(u32), 1, fp);
3073 if (rc)
3074 return rc;
3075 for (c = p->ocontexts[i]; c; c = c->next) {
3076 switch (i) {
3077 case OCON_ISID:
3078 buf[0] = cpu_to_le32(c->sid[0]);
3079 rc = put_entry(buf, sizeof(u32), 1, fp);
3080 if (rc)
3081 return rc;
3082 rc = context_write(p, &c->context[0], fp);
3083 if (rc)
3084 return rc;
3085 break;
3086 case OCON_FS:
3087 case OCON_NETIF:
3088 len = strlen(c->u.name);
3089 buf[0] = cpu_to_le32(len);
3090 rc = put_entry(buf, sizeof(u32), 1, fp);
3091 if (rc)
3092 return rc;
3093 rc = put_entry(c->u.name, 1, len, fp);
3094 if (rc)
3095 return rc;
3096 rc = context_write(p, &c->context[0], fp);
3097 if (rc)
3098 return rc;
3099 rc = context_write(p, &c->context[1], fp);
3100 if (rc)
3101 return rc;
3102 break;
3103 case OCON_PORT:
3104 buf[0] = cpu_to_le32(c->u.port.protocol);
3105 buf[1] = cpu_to_le32(c->u.port.low_port);
3106 buf[2] = cpu_to_le32(c->u.port.high_port);
3107 rc = put_entry(buf, sizeof(u32), 3, fp);
3108 if (rc)
3109 return rc;
3110 rc = context_write(p, &c->context[0], fp);
3111 if (rc)
3112 return rc;
3113 break;
3114 case OCON_NODE:
3115 nodebuf[0] = c->u.node.addr; /* network order */
3116 nodebuf[1] = c->u.node.mask; /* network order */
3117 rc = put_entry(nodebuf, sizeof(u32), 2, fp);
3118 if (rc)
3119 return rc;
3120 rc = context_write(p, &c->context[0], fp);
3121 if (rc)
3122 return rc;
3123 break;
3124 case OCON_FSUSE:
3125 buf[0] = cpu_to_le32(c->v.behavior);
3126 len = strlen(c->u.name);
3127 buf[1] = cpu_to_le32(len);
3128 rc = put_entry(buf, sizeof(u32), 2, fp);
3129 if (rc)
3130 return rc;
3131 rc = put_entry(c->u.name, 1, len, fp);
3132 if (rc)
3133 return rc;
3134 rc = context_write(p, &c->context[0], fp);
3135 if (rc)
3136 return rc;
3137 break;
3138 case OCON_NODE6:
3139 for (j = 0; j < 4; j++)
3140 nodebuf[j] = c->u.node6.addr[j]; /* network order */
3141 for (j = 0; j < 4; j++)
3142 nodebuf[j + 4] = c->u.node6.mask[j]; /* network order */
3143 rc = put_entry(nodebuf, sizeof(u32), 8, fp);
3144 if (rc)
3145 return rc;
3146 rc = context_write(p, &c->context[0], fp);
3147 if (rc)
3148 return rc;
3149 break;
3150 }
3151 }
3152 }
3153 return 0;
3154}
3155
3156static int genfs_write(struct policydb *p, void *fp)
3157{
3158 struct genfs *genfs;
3159 struct ocontext *c;
3160 size_t len;
3161 __le32 buf[1];
3162 int rc;
3163
3164 len = 0;
3165 for (genfs = p->genfs; genfs; genfs = genfs->next)
3166 len++;
3167 buf[0] = cpu_to_le32(len);
3168 rc = put_entry(buf, sizeof(u32), 1, fp);
3169 if (rc)
3170 return rc;
3171 for (genfs = p->genfs; genfs; genfs = genfs->next) {
3172 len = strlen(genfs->fstype);
3173 buf[0] = cpu_to_le32(len);
3174 rc = put_entry(buf, sizeof(u32), 1, fp);
3175 if (rc)
3176 return rc;
3177 rc = put_entry(genfs->fstype, 1, len, fp);
3178 if (rc)
3179 return rc;
3180 len = 0;
3181 for (c = genfs->head; c; c = c->next)
3182 len++;
3183 buf[0] = cpu_to_le32(len);
3184 rc = put_entry(buf, sizeof(u32), 1, fp);
3185 if (rc)
3186 return rc;
3187 for (c = genfs->head; c; c = c->next) {
3188 len = strlen(c->u.name);
3189 buf[0] = cpu_to_le32(len);
3190 rc = put_entry(buf, sizeof(u32), 1, fp);
3191 if (rc)
3192 return rc;
3193 rc = put_entry(c->u.name, 1, len, fp);
3194 if (rc)
3195 return rc;
3196 buf[0] = cpu_to_le32(c->v.sclass);
3197 rc = put_entry(buf, sizeof(u32), 1, fp);
3198 if (rc)
3199 return rc;
3200 rc = context_write(p, &c->context[0], fp);
3201 if (rc)
3202 return rc;
3203 }
3204 }
3205 return 0;
3206}
3207
3208static int hashtab_cnt(void *key, void *data, void *ptr)
3209{
3210 int *cnt = ptr;
3211 *cnt = *cnt + 1;
3212
3213 return 0;
3214}
3215
3216static int range_write_helper(void *key, void *data, void *ptr)
3217{
3218 __le32 buf[2];
3219 struct range_trans *rt = key;
3220 struct mls_range *r = data;
3221 struct policy_data *pd = ptr;
3222 void *fp = pd->fp;
3223 struct policydb *p = pd->p;
3224 int rc;
3225
3226 buf[0] = cpu_to_le32(rt->source_type);
3227 buf[1] = cpu_to_le32(rt->target_type);
3228 rc = put_entry(buf, sizeof(u32), 2, fp);
3229 if (rc)
3230 return rc;
3231 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
3232 buf[0] = cpu_to_le32(rt->target_class);
3233 rc = put_entry(buf, sizeof(u32), 1, fp);
3234 if (rc)
3235 return rc;
3236 }
3237 rc = mls_write_range_helper(r, fp);
3238 if (rc)
3239 return rc;
3240
3241 return 0;
3242}
3243
3244static int range_write(struct policydb *p, void *fp)
3245{
3246 __le32 buf[1];
3247 int rc, nel;
3248 struct policy_data pd;
3249
3250 pd.p = p;
3251 pd.fp = fp;
3252
3253 /* count the number of entries in the hashtab */
3254 nel = 0;
3255 rc = hashtab_map(p->range_tr, hashtab_cnt, &nel);
3256 if (rc)
3257 return rc;
3258
3259 buf[0] = cpu_to_le32(nel);
3260 rc = put_entry(buf, sizeof(u32), 1, fp);
3261 if (rc)
3262 return rc;
3263
3264 /* actually write all of the entries */
3265 rc = hashtab_map(p->range_tr, range_write_helper, &pd);
3266 if (rc)
3267 return rc;
3268
3269 return 0;
3270}
3271
3272static int filename_write_helper(void *key, void *data, void *ptr)
3273{
3274 __le32 buf[4];
3275 struct filename_trans *ft = key;
3276 struct filename_trans_datum *otype = data;
3277 void *fp = ptr;
3278 int rc;
3279 u32 len;
3280
3281 len = strlen(ft->name);
3282 buf[0] = cpu_to_le32(len);
3283 rc = put_entry(buf, sizeof(u32), 1, fp);
3284 if (rc)
3285 return rc;
3286
3287 rc = put_entry(ft->name, sizeof(char), len, fp);
3288 if (rc)
3289 return rc;
3290
3291 buf[0] = cpu_to_le32(ft->stype);
3292 buf[1] = cpu_to_le32(ft->ttype);
3293 buf[2] = cpu_to_le32(ft->tclass);
3294 buf[3] = cpu_to_le32(otype->otype);
3295
3296 rc = put_entry(buf, sizeof(u32), 4, fp);
3297 if (rc)
3298 return rc;
3299
3300 return 0;
3301}
3302
3303static int filename_trans_write(struct policydb *p, void *fp)
3304{
3305 u32 nel;
3306 __le32 buf[1];
3307 int rc;
3308
3309 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
3310 return 0;
3311
3312 nel = 0;
3313 rc = hashtab_map(p->filename_trans, hashtab_cnt, &nel);
3314 if (rc)
3315 return rc;
3316
3317 buf[0] = cpu_to_le32(nel);
3318 rc = put_entry(buf, sizeof(u32), 1, fp);
3319 if (rc)
3320 return rc;
3321
3322 rc = hashtab_map(p->filename_trans, filename_write_helper, fp);
3323 if (rc)
3324 return rc;
3325
3326 return 0;
3327}
3328
3329/*
3330 * Write the configuration data in a policy database
3331 * structure to a policy database binary representation
3332 * file.
3333 */
3334int policydb_write(struct policydb *p, void *fp)
3335{
3336 unsigned int i, num_syms;
3337 int rc;
3338 __le32 buf[4];
3339 u32 config;
3340 size_t len;
3341 struct policydb_compat_info *info;
3342
3343 /*
3344 * refuse to write policy older than compressed avtab
3345 * to simplify the writer. There are other tests dropped
3346 * since we assume this throughout the writer code. Be
3347 * careful if you ever try to remove this restriction
3348 */
3349 if (p->policyvers < POLICYDB_VERSION_AVTAB) {
3350 printk(KERN_ERR "SELinux: refusing to write policy version %d."
3351 " Because it is less than version %d\n", p->policyvers,
3352 POLICYDB_VERSION_AVTAB);
3353 return -EINVAL;
3354 }
3355
3356 config = 0;
3357 if (p->mls_enabled)
3358 config |= POLICYDB_CONFIG_MLS;
3359
3360 if (p->reject_unknown)
3361 config |= REJECT_UNKNOWN;
3362 if (p->allow_unknown)
3363 config |= ALLOW_UNKNOWN;
3364
3365 /* Write the magic number and string identifiers. */
3366 buf[0] = cpu_to_le32(POLICYDB_MAGIC);
3367 len = strlen(POLICYDB_STRING);
3368 buf[1] = cpu_to_le32(len);
3369 rc = put_entry(buf, sizeof(u32), 2, fp);
3370 if (rc)
3371 return rc;
3372 rc = put_entry(POLICYDB_STRING, 1, len, fp);
3373 if (rc)
3374 return rc;
3375
3376 /* Write the version, config, and table sizes. */
3377 info = policydb_lookup_compat(p->policyvers);
3378 if (!info) {
3379 printk(KERN_ERR "SELinux: compatibility lookup failed for policy "
3380 "version %d", p->policyvers);
3381 return -EINVAL;
3382 }
3383
3384 buf[0] = cpu_to_le32(p->policyvers);
3385 buf[1] = cpu_to_le32(config);
3386 buf[2] = cpu_to_le32(info->sym_num);
3387 buf[3] = cpu_to_le32(info->ocon_num);
3388
3389 rc = put_entry(buf, sizeof(u32), 4, fp);
3390 if (rc)
3391 return rc;
3392
3393 if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
3394 rc = ebitmap_write(&p->policycaps, fp);
3395 if (rc)
3396 return rc;
3397 }
3398
3399 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
3400 rc = ebitmap_write(&p->permissive_map, fp);
3401 if (rc)
3402 return rc;
3403 }
3404
3405 num_syms = info->sym_num;
3406 for (i = 0; i < num_syms; i++) {
3407 struct policy_data pd;
3408
3409 pd.fp = fp;
3410 pd.p = p;
3411
3412 buf[0] = cpu_to_le32(p->symtab[i].nprim);
3413 buf[1] = cpu_to_le32(p->symtab[i].table->nel);
3414
3415 rc = put_entry(buf, sizeof(u32), 2, fp);
3416 if (rc)
3417 return rc;
3418 rc = hashtab_map(p->symtab[i].table, write_f[i], &pd);
3419 if (rc)
3420 return rc;
3421 }
3422
3423 rc = avtab_write(p, &p->te_avtab, fp);
3424 if (rc)
3425 return rc;
3426
3427 rc = cond_write_list(p, p->cond_list, fp);
3428 if (rc)
3429 return rc;
3430
3431 rc = role_trans_write(p, fp);
3432 if (rc)
3433 return rc;
3434
3435 rc = role_allow_write(p->role_allow, fp);
3436 if (rc)
3437 return rc;
3438
3439 rc = filename_trans_write(p, fp);
3440 if (rc)
3441 return rc;
3442
3443 rc = ocontext_write(p, info, fp);
3444 if (rc)
3445 return rc;
3446
3447 rc = genfs_write(p, fp);
3448 if (rc)
3449 return rc;
3450
3451 rc = range_write(p, fp);
3452 if (rc)
3453 return rc;
3454
3455 for (i = 0; i < p->p_types.nprim; i++) {
3456 struct ebitmap *e = flex_array_get(p->type_attr_map_array, i);
3457
3458 BUG_ON(!e);
3459 rc = ebitmap_write(e, fp);
3460 if (rc)
3461 return rc;
3462 }
3463
3464 return 0;
3465}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Implementation of the policy database.
4 *
5 * Author : Stephen Smalley, <stephen.smalley.work@gmail.com>
6 */
7
8/*
9 * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
10 * Support for enhanced MLS infrastructure.
11 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
12 *
13 * Updated: Frank Mayer <mayerf@tresys.com> and
14 * Karl MacMillan <kmacmillan@tresys.com>
15 * Added conditional policy language extensions
16 * Copyright (C) 2003-2004 Tresys Technology, LLC
17 *
18 * Updated: Hewlett-Packard <paul@paul-moore.com>
19 * Added support for the policy capability bitmap
20 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
21 *
22 * Update: Mellanox Techonologies
23 * Added Infiniband support
24 * Copyright (C) 2016 Mellanox Techonologies
25 */
26
27#include <linux/kernel.h>
28#include <linux/sched.h>
29#include <linux/slab.h>
30#include <linux/string.h>
31#include <linux/errno.h>
32#include <linux/audit.h>
33#include "security.h"
34
35#include "policydb.h"
36#include "conditional.h"
37#include "mls.h"
38#include "services.h"
39
40#ifdef CONFIG_SECURITY_SELINUX_DEBUG
41/* clang-format off */
42static const char *const symtab_name[SYM_NUM] = {
43 "common prefixes",
44 "classes",
45 "roles",
46 "types",
47 "users",
48 "bools",
49 "levels",
50 "categories",
51};
52/* clang-format off */
53#endif
54
55struct policydb_compat_info {
56 unsigned int version;
57 unsigned int sym_num;
58 unsigned int ocon_num;
59};
60
61/* These need to be updated if SYM_NUM or OCON_NUM changes */
62static const struct policydb_compat_info policydb_compat[] = {
63 {
64 .version = POLICYDB_VERSION_BASE,
65 .sym_num = SYM_NUM - 3,
66 .ocon_num = OCON_NUM - 3,
67 },
68 {
69 .version = POLICYDB_VERSION_BOOL,
70 .sym_num = SYM_NUM - 2,
71 .ocon_num = OCON_NUM - 3,
72 },
73 {
74 .version = POLICYDB_VERSION_IPV6,
75 .sym_num = SYM_NUM - 2,
76 .ocon_num = OCON_NUM - 2,
77 },
78 {
79 .version = POLICYDB_VERSION_NLCLASS,
80 .sym_num = SYM_NUM - 2,
81 .ocon_num = OCON_NUM - 2,
82 },
83 {
84 .version = POLICYDB_VERSION_MLS,
85 .sym_num = SYM_NUM,
86 .ocon_num = OCON_NUM - 2,
87 },
88 {
89 .version = POLICYDB_VERSION_AVTAB,
90 .sym_num = SYM_NUM,
91 .ocon_num = OCON_NUM - 2,
92 },
93 {
94 .version = POLICYDB_VERSION_RANGETRANS,
95 .sym_num = SYM_NUM,
96 .ocon_num = OCON_NUM - 2,
97 },
98 {
99 .version = POLICYDB_VERSION_POLCAP,
100 .sym_num = SYM_NUM,
101 .ocon_num = OCON_NUM - 2,
102 },
103 {
104 .version = POLICYDB_VERSION_PERMISSIVE,
105 .sym_num = SYM_NUM,
106 .ocon_num = OCON_NUM - 2,
107 },
108 {
109 .version = POLICYDB_VERSION_BOUNDARY,
110 .sym_num = SYM_NUM,
111 .ocon_num = OCON_NUM - 2,
112 },
113 {
114 .version = POLICYDB_VERSION_FILENAME_TRANS,
115 .sym_num = SYM_NUM,
116 .ocon_num = OCON_NUM - 2,
117 },
118 {
119 .version = POLICYDB_VERSION_ROLETRANS,
120 .sym_num = SYM_NUM,
121 .ocon_num = OCON_NUM - 2,
122 },
123 {
124 .version = POLICYDB_VERSION_NEW_OBJECT_DEFAULTS,
125 .sym_num = SYM_NUM,
126 .ocon_num = OCON_NUM - 2,
127 },
128 {
129 .version = POLICYDB_VERSION_DEFAULT_TYPE,
130 .sym_num = SYM_NUM,
131 .ocon_num = OCON_NUM - 2,
132 },
133 {
134 .version = POLICYDB_VERSION_CONSTRAINT_NAMES,
135 .sym_num = SYM_NUM,
136 .ocon_num = OCON_NUM - 2,
137 },
138 {
139 .version = POLICYDB_VERSION_XPERMS_IOCTL,
140 .sym_num = SYM_NUM,
141 .ocon_num = OCON_NUM - 2,
142 },
143 {
144 .version = POLICYDB_VERSION_INFINIBAND,
145 .sym_num = SYM_NUM,
146 .ocon_num = OCON_NUM,
147 },
148 {
149 .version = POLICYDB_VERSION_GLBLUB,
150 .sym_num = SYM_NUM,
151 .ocon_num = OCON_NUM,
152 },
153 {
154 .version = POLICYDB_VERSION_COMP_FTRANS,
155 .sym_num = SYM_NUM,
156 .ocon_num = OCON_NUM,
157 },
158};
159
160static const struct policydb_compat_info *
161policydb_lookup_compat(unsigned int version)
162{
163 unsigned int i;
164
165 for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) {
166 if (policydb_compat[i].version == version)
167 return &policydb_compat[i];
168 }
169
170 return NULL;
171}
172
173/*
174 * The following *_destroy functions are used to
175 * free any memory allocated for each kind of
176 * symbol data in the policy database.
177 */
178
179static int perm_destroy(void *key, void *datum, void *p)
180{
181 kfree(key);
182 kfree(datum);
183 return 0;
184}
185
186static int common_destroy(void *key, void *datum, void *p)
187{
188 struct common_datum *comdatum;
189
190 kfree(key);
191 if (datum) {
192 comdatum = datum;
193 hashtab_map(&comdatum->permissions.table, perm_destroy, NULL);
194 hashtab_destroy(&comdatum->permissions.table);
195 }
196 kfree(datum);
197 return 0;
198}
199
200static void constraint_expr_destroy(struct constraint_expr *expr)
201{
202 if (expr) {
203 ebitmap_destroy(&expr->names);
204 if (expr->type_names) {
205 ebitmap_destroy(&expr->type_names->types);
206 ebitmap_destroy(&expr->type_names->negset);
207 kfree(expr->type_names);
208 }
209 kfree(expr);
210 }
211}
212
213static int cls_destroy(void *key, void *datum, void *p)
214{
215 struct class_datum *cladatum;
216 struct constraint_node *constraint, *ctemp;
217 struct constraint_expr *e, *etmp;
218
219 kfree(key);
220 if (datum) {
221 cladatum = datum;
222 hashtab_map(&cladatum->permissions.table, perm_destroy, NULL);
223 hashtab_destroy(&cladatum->permissions.table);
224 constraint = cladatum->constraints;
225 while (constraint) {
226 e = constraint->expr;
227 while (e) {
228 etmp = e;
229 e = e->next;
230 constraint_expr_destroy(etmp);
231 }
232 ctemp = constraint;
233 constraint = constraint->next;
234 kfree(ctemp);
235 }
236
237 constraint = cladatum->validatetrans;
238 while (constraint) {
239 e = constraint->expr;
240 while (e) {
241 etmp = e;
242 e = e->next;
243 constraint_expr_destroy(etmp);
244 }
245 ctemp = constraint;
246 constraint = constraint->next;
247 kfree(ctemp);
248 }
249 kfree(cladatum->comkey);
250 }
251 kfree(datum);
252 return 0;
253}
254
255static int role_destroy(void *key, void *datum, void *p)
256{
257 struct role_datum *role;
258
259 kfree(key);
260 if (datum) {
261 role = datum;
262 ebitmap_destroy(&role->dominates);
263 ebitmap_destroy(&role->types);
264 }
265 kfree(datum);
266 return 0;
267}
268
269static int type_destroy(void *key, void *datum, void *p)
270{
271 kfree(key);
272 kfree(datum);
273 return 0;
274}
275
276static int user_destroy(void *key, void *datum, void *p)
277{
278 struct user_datum *usrdatum;
279
280 kfree(key);
281 if (datum) {
282 usrdatum = datum;
283 ebitmap_destroy(&usrdatum->roles);
284 ebitmap_destroy(&usrdatum->range.level[0].cat);
285 ebitmap_destroy(&usrdatum->range.level[1].cat);
286 ebitmap_destroy(&usrdatum->dfltlevel.cat);
287 }
288 kfree(datum);
289 return 0;
290}
291
292static int sens_destroy(void *key, void *datum, void *p)
293{
294 struct level_datum *levdatum;
295
296 kfree(key);
297 if (datum) {
298 levdatum = datum;
299 if (levdatum->level)
300 ebitmap_destroy(&levdatum->level->cat);
301 kfree(levdatum->level);
302 }
303 kfree(datum);
304 return 0;
305}
306
307static int cat_destroy(void *key, void *datum, void *p)
308{
309 kfree(key);
310 kfree(datum);
311 return 0;
312}
313
314/* clang-format off */
315static int (*const destroy_f[SYM_NUM])(void *key, void *datum, void *datap) = {
316 common_destroy,
317 cls_destroy,
318 role_destroy,
319 type_destroy,
320 user_destroy,
321 cond_destroy_bool,
322 sens_destroy,
323 cat_destroy,
324};
325/* clang-format on */
326
327static int filenametr_destroy(void *key, void *datum, void *p)
328{
329 struct filename_trans_key *ft = key;
330 struct filename_trans_datum *next, *d = datum;
331
332 kfree(ft->name);
333 kfree(key);
334 do {
335 ebitmap_destroy(&d->stypes);
336 next = d->next;
337 kfree(d);
338 d = next;
339 } while (unlikely(d));
340 cond_resched();
341 return 0;
342}
343
344static int range_tr_destroy(void *key, void *datum, void *p)
345{
346 struct mls_range *rt = datum;
347
348 kfree(key);
349 ebitmap_destroy(&rt->level[0].cat);
350 ebitmap_destroy(&rt->level[1].cat);
351 kfree(datum);
352 cond_resched();
353 return 0;
354}
355
356static int role_tr_destroy(void *key, void *datum, void *p)
357{
358 kfree(key);
359 kfree(datum);
360 return 0;
361}
362
363static void ocontext_destroy(struct ocontext *c, unsigned int i)
364{
365 if (!c)
366 return;
367
368 context_destroy(&c->context[0]);
369 context_destroy(&c->context[1]);
370 if (i == OCON_ISID || i == OCON_FS || i == OCON_NETIF ||
371 i == OCON_FSUSE)
372 kfree(c->u.name);
373 kfree(c);
374}
375
376/*
377 * Initialize the role table.
378 */
379static int roles_init(struct policydb *p)
380{
381 char *key = NULL;
382 int rc;
383 struct role_datum *role;
384
385 role = kzalloc(sizeof(*role), GFP_KERNEL);
386 if (!role)
387 return -ENOMEM;
388
389 rc = -EINVAL;
390 role->value = ++p->p_roles.nprim;
391 if (role->value != OBJECT_R_VAL)
392 goto out;
393
394 rc = -ENOMEM;
395 key = kstrdup(OBJECT_R, GFP_KERNEL);
396 if (!key)
397 goto out;
398
399 rc = symtab_insert(&p->p_roles, key, role);
400 if (rc)
401 goto out;
402
403 return 0;
404out:
405 kfree(key);
406 kfree(role);
407 return rc;
408}
409
410static u32 filenametr_hash(const void *k)
411{
412 const struct filename_trans_key *ft = k;
413 unsigned long salt = ft->ttype ^ ft->tclass;
414
415 return full_name_hash((void *)salt, ft->name, strlen(ft->name));
416}
417
418static int filenametr_cmp(const void *k1, const void *k2)
419{
420 const struct filename_trans_key *ft1 = k1;
421 const struct filename_trans_key *ft2 = k2;
422 int v;
423
424 v = ft1->ttype - ft2->ttype;
425 if (v)
426 return v;
427
428 v = ft1->tclass - ft2->tclass;
429 if (v)
430 return v;
431
432 return strcmp(ft1->name, ft2->name);
433}
434
435static const struct hashtab_key_params filenametr_key_params = {
436 .hash = filenametr_hash,
437 .cmp = filenametr_cmp,
438};
439
440struct filename_trans_datum *
441policydb_filenametr_search(struct policydb *p, struct filename_trans_key *key)
442{
443 return hashtab_search(&p->filename_trans, key, filenametr_key_params);
444}
445
446static u32 rangetr_hash(const void *k)
447{
448 const struct range_trans *key = k;
449
450 return key->source_type + (key->target_type << 3) +
451 (key->target_class << 5);
452}
453
454static int rangetr_cmp(const void *k1, const void *k2)
455{
456 const struct range_trans *key1 = k1, *key2 = k2;
457 int v;
458
459 v = key1->source_type - key2->source_type;
460 if (v)
461 return v;
462
463 v = key1->target_type - key2->target_type;
464 if (v)
465 return v;
466
467 v = key1->target_class - key2->target_class;
468
469 return v;
470}
471
472static const struct hashtab_key_params rangetr_key_params = {
473 .hash = rangetr_hash,
474 .cmp = rangetr_cmp,
475};
476
477struct mls_range *policydb_rangetr_search(struct policydb *p,
478 struct range_trans *key)
479{
480 return hashtab_search(&p->range_tr, key, rangetr_key_params);
481}
482
483static u32 role_trans_hash(const void *k)
484{
485 const struct role_trans_key *key = k;
486
487 return jhash_3words(key->role, key->type,
488 (u32)key->tclass << 16 | key->tclass, 0);
489}
490
491static int role_trans_cmp(const void *k1, const void *k2)
492{
493 const struct role_trans_key *key1 = k1, *key2 = k2;
494 int v;
495
496 v = key1->role - key2->role;
497 if (v)
498 return v;
499
500 v = key1->type - key2->type;
501 if (v)
502 return v;
503
504 return key1->tclass - key2->tclass;
505}
506
507static const struct hashtab_key_params roletr_key_params = {
508 .hash = role_trans_hash,
509 .cmp = role_trans_cmp,
510};
511
512struct role_trans_datum *policydb_roletr_search(struct policydb *p,
513 struct role_trans_key *key)
514{
515 return hashtab_search(&p->role_tr, key, roletr_key_params);
516}
517
518/*
519 * Initialize a policy database structure.
520 */
521static void policydb_init(struct policydb *p)
522{
523 memset(p, 0, sizeof(*p));
524
525 avtab_init(&p->te_avtab);
526 cond_policydb_init(p);
527
528 ebitmap_init(&p->filename_trans_ttypes);
529 ebitmap_init(&p->policycaps);
530 ebitmap_init(&p->permissive_map);
531}
532
533/*
534 * The following *_index functions are used to
535 * define the val_to_name and val_to_struct arrays
536 * in a policy database structure. The val_to_name
537 * arrays are used when converting security context
538 * structures into string representations. The
539 * val_to_struct arrays are used when the attributes
540 * of a class, role, or user are needed.
541 */
542
543static int common_index(void *key, void *datum, void *datap)
544{
545 struct policydb *p;
546 struct common_datum *comdatum;
547
548 comdatum = datum;
549 p = datap;
550 if (!comdatum->value || comdatum->value > p->p_commons.nprim)
551 return -EINVAL;
552
553 p->sym_val_to_name[SYM_COMMONS][comdatum->value - 1] = key;
554
555 return 0;
556}
557
558static int class_index(void *key, void *datum, void *datap)
559{
560 struct policydb *p;
561 struct class_datum *cladatum;
562
563 cladatum = datum;
564 p = datap;
565 if (!cladatum->value || cladatum->value > p->p_classes.nprim)
566 return -EINVAL;
567
568 p->sym_val_to_name[SYM_CLASSES][cladatum->value - 1] = key;
569 p->class_val_to_struct[cladatum->value - 1] = cladatum;
570 return 0;
571}
572
573static int role_index(void *key, void *datum, void *datap)
574{
575 struct policydb *p;
576 struct role_datum *role;
577
578 role = datum;
579 p = datap;
580 if (!role->value || role->value > p->p_roles.nprim ||
581 role->bounds > p->p_roles.nprim)
582 return -EINVAL;
583
584 p->sym_val_to_name[SYM_ROLES][role->value - 1] = key;
585 p->role_val_to_struct[role->value - 1] = role;
586 return 0;
587}
588
589static int type_index(void *key, void *datum, void *datap)
590{
591 struct policydb *p;
592 struct type_datum *typdatum;
593
594 typdatum = datum;
595 p = datap;
596
597 if (typdatum->primary) {
598 if (!typdatum->value || typdatum->value > p->p_types.nprim ||
599 typdatum->bounds > p->p_types.nprim)
600 return -EINVAL;
601 p->sym_val_to_name[SYM_TYPES][typdatum->value - 1] = key;
602 p->type_val_to_struct[typdatum->value - 1] = typdatum;
603 }
604
605 return 0;
606}
607
608static int user_index(void *key, void *datum, void *datap)
609{
610 struct policydb *p;
611 struct user_datum *usrdatum;
612
613 usrdatum = datum;
614 p = datap;
615 if (!usrdatum->value || usrdatum->value > p->p_users.nprim ||
616 usrdatum->bounds > p->p_users.nprim)
617 return -EINVAL;
618
619 p->sym_val_to_name[SYM_USERS][usrdatum->value - 1] = key;
620 p->user_val_to_struct[usrdatum->value - 1] = usrdatum;
621 return 0;
622}
623
624static int sens_index(void *key, void *datum, void *datap)
625{
626 struct policydb *p;
627 struct level_datum *levdatum;
628
629 levdatum = datum;
630 p = datap;
631
632 if (!levdatum->isalias) {
633 if (!levdatum->level->sens ||
634 levdatum->level->sens > p->p_levels.nprim)
635 return -EINVAL;
636
637 p->sym_val_to_name[SYM_LEVELS][levdatum->level->sens - 1] = key;
638 }
639
640 return 0;
641}
642
643static int cat_index(void *key, void *datum, void *datap)
644{
645 struct policydb *p;
646 struct cat_datum *catdatum;
647
648 catdatum = datum;
649 p = datap;
650
651 if (!catdatum->isalias) {
652 if (!catdatum->value || catdatum->value > p->p_cats.nprim)
653 return -EINVAL;
654
655 p->sym_val_to_name[SYM_CATS][catdatum->value - 1] = key;
656 }
657
658 return 0;
659}
660
661/* clang-format off */
662static int (*const index_f[SYM_NUM])(void *key, void *datum, void *datap) = {
663 common_index,
664 class_index,
665 role_index,
666 type_index,
667 user_index,
668 cond_index_bool,
669 sens_index,
670 cat_index,
671};
672/* clang-format on */
673
674#ifdef CONFIG_SECURITY_SELINUX_DEBUG
675static void hash_eval(struct hashtab *h, const char *hash_name)
676{
677 struct hashtab_info info;
678
679 hashtab_stat(h, &info);
680 pr_debug(
681 "SELinux: %s: %d entries and %d/%d buckets used, longest chain length %d, sum of chain length^2 %llu\n",
682 hash_name, h->nel, info.slots_used, h->size, info.max_chain_len,
683 info.chain2_len_sum);
684}
685
686static void symtab_hash_eval(struct symtab *s)
687{
688 int i;
689
690 for (i = 0; i < SYM_NUM; i++)
691 hash_eval(&s[i].table, symtab_name[i]);
692}
693
694#else
695static inline void hash_eval(struct hashtab *h, const char *hash_name)
696{
697}
698static inline void symtab_hash_eval(struct symtab *s)
699{
700}
701#endif /* CONFIG_SECURITY_SELINUX_DEBUG */
702
703/*
704 * Define the other val_to_name and val_to_struct arrays
705 * in a policy database structure.
706 *
707 * Caller must clean up on failure.
708 */
709static int policydb_index(struct policydb *p)
710{
711 int i, rc;
712
713 if (p->mls_enabled)
714 pr_debug(
715 "SELinux: %d users, %d roles, %d types, %d bools, %d sens, %d cats\n",
716 p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim,
717 p->p_bools.nprim, p->p_levels.nprim, p->p_cats.nprim);
718 else
719 pr_debug("SELinux: %d users, %d roles, %d types, %d bools\n",
720 p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim,
721 p->p_bools.nprim);
722
723 pr_debug("SELinux: %d classes, %d rules\n", p->p_classes.nprim,
724 p->te_avtab.nel);
725
726 avtab_hash_eval(&p->te_avtab, "rules");
727 symtab_hash_eval(p->symtab);
728
729 p->class_val_to_struct = kcalloc(p->p_classes.nprim,
730 sizeof(*p->class_val_to_struct),
731 GFP_KERNEL);
732 if (!p->class_val_to_struct)
733 return -ENOMEM;
734
735 p->role_val_to_struct = kcalloc(
736 p->p_roles.nprim, sizeof(*p->role_val_to_struct), GFP_KERNEL);
737 if (!p->role_val_to_struct)
738 return -ENOMEM;
739
740 p->user_val_to_struct = kcalloc(
741 p->p_users.nprim, sizeof(*p->user_val_to_struct), GFP_KERNEL);
742 if (!p->user_val_to_struct)
743 return -ENOMEM;
744
745 p->type_val_to_struct = kvcalloc(
746 p->p_types.nprim, sizeof(*p->type_val_to_struct), GFP_KERNEL);
747 if (!p->type_val_to_struct)
748 return -ENOMEM;
749
750 rc = cond_init_bool_indexes(p);
751 if (rc)
752 goto out;
753
754 for (i = 0; i < SYM_NUM; i++) {
755 p->sym_val_to_name[i] = kvcalloc(p->symtab[i].nprim,
756 sizeof(char *), GFP_KERNEL);
757 if (!p->sym_val_to_name[i])
758 return -ENOMEM;
759
760 rc = hashtab_map(&p->symtab[i].table, index_f[i], p);
761 if (rc)
762 goto out;
763 }
764 rc = 0;
765out:
766 return rc;
767}
768
769/*
770 * Free any memory allocated by a policy database structure.
771 */
772void policydb_destroy(struct policydb *p)
773{
774 struct ocontext *c, *ctmp;
775 struct genfs *g, *gtmp;
776 u32 i;
777 struct role_allow *ra, *lra = NULL;
778
779 for (i = 0; i < SYM_NUM; i++) {
780 cond_resched();
781 hashtab_map(&p->symtab[i].table, destroy_f[i], NULL);
782 hashtab_destroy(&p->symtab[i].table);
783 }
784
785 for (i = 0; i < SYM_NUM; i++)
786 kvfree(p->sym_val_to_name[i]);
787
788 kfree(p->class_val_to_struct);
789 kfree(p->role_val_to_struct);
790 kfree(p->user_val_to_struct);
791 kvfree(p->type_val_to_struct);
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 hashtab_map(&p->role_tr, role_tr_destroy, NULL);
825 hashtab_destroy(&p->role_tr);
826
827 for (ra = p->role_allow; ra; ra = ra->next) {
828 cond_resched();
829 kfree(lra);
830 lra = ra;
831 }
832 kfree(lra);
833
834 hashtab_map(&p->filename_trans, filenametr_destroy, NULL);
835 hashtab_destroy(&p->filename_trans);
836
837 hashtab_map(&p->range_tr, range_tr_destroy, NULL);
838 hashtab_destroy(&p->range_tr);
839
840 if (p->type_attr_map_array) {
841 for (i = 0; i < p->p_types.nprim; i++)
842 ebitmap_destroy(&p->type_attr_map_array[i]);
843 kvfree(p->type_attr_map_array);
844 }
845
846 ebitmap_destroy(&p->filename_trans_ttypes);
847 ebitmap_destroy(&p->policycaps);
848 ebitmap_destroy(&p->permissive_map);
849}
850
851/*
852 * Load the initial SIDs specified in a policy database
853 * structure into a SID table.
854 */
855int policydb_load_isids(struct policydb *p, struct sidtab *s)
856{
857 struct ocontext *head, *c;
858 bool isid_init;
859 int rc;
860
861 rc = sidtab_init(s);
862 if (rc) {
863 pr_err("SELinux: out of memory on SID table init\n");
864 return rc;
865 }
866
867 isid_init = ebitmap_get_bit(&p->policycaps,
868 POLICYDB_CAP_USERSPACE_INITIAL_CONTEXT);
869
870 head = p->ocontexts[OCON_ISID];
871 for (c = head; c; c = c->next) {
872 u32 sid = c->sid[0];
873 const char *name = security_get_initial_sid_context(sid);
874
875 if (sid == SECSID_NULL) {
876 pr_err("SELinux: SID 0 was assigned a context.\n");
877 sidtab_destroy(s);
878 return -EINVAL;
879 }
880
881 /* Ignore initial SIDs unused by this kernel. */
882 if (!name)
883 continue;
884
885 /*
886 * Also ignore SECINITSID_INIT if the policy doesn't declare
887 * support for it
888 */
889 if (sid == SECINITSID_INIT && !isid_init)
890 continue;
891
892 rc = sidtab_set_initial(s, sid, &c->context[0]);
893 if (rc) {
894 pr_err("SELinux: unable to load initial SID %s.\n",
895 name);
896 sidtab_destroy(s);
897 return rc;
898 }
899
900 /*
901 * If the policy doesn't support the "userspace_initial_context"
902 * capability, set SECINITSID_INIT to the same context as
903 * SECINITSID_KERNEL. This ensures the same behavior as before
904 * the reintroduction of SECINITSID_INIT, where all tasks
905 * started before policy load would initially get the context
906 * corresponding to SECINITSID_KERNEL.
907 */
908 if (sid == SECINITSID_KERNEL && !isid_init) {
909 rc = sidtab_set_initial(s, SECINITSID_INIT,
910 &c->context[0]);
911 if (rc) {
912 pr_err("SELinux: unable to load initial SID %s.\n",
913 name);
914 sidtab_destroy(s);
915 return rc;
916 }
917 }
918 }
919 return 0;
920}
921
922int policydb_class_isvalid(struct policydb *p, unsigned int class)
923{
924 if (!class || class > p->p_classes.nprim)
925 return 0;
926 return 1;
927}
928
929int policydb_role_isvalid(struct policydb *p, unsigned int role)
930{
931 if (!role || role > p->p_roles.nprim)
932 return 0;
933 return 1;
934}
935
936int policydb_type_isvalid(struct policydb *p, unsigned int type)
937{
938 if (!type || type > p->p_types.nprim)
939 return 0;
940 return 1;
941}
942
943/*
944 * Return 1 if the fields in the security context
945 * structure `c' are valid. Return 0 otherwise.
946 */
947int policydb_context_isvalid(struct policydb *p, struct context *c)
948{
949 struct role_datum *role;
950 struct user_datum *usrdatum;
951
952 if (!c->role || c->role > p->p_roles.nprim)
953 return 0;
954
955 if (!c->user || c->user > p->p_users.nprim)
956 return 0;
957
958 if (!c->type || c->type > p->p_types.nprim)
959 return 0;
960
961 if (c->role != OBJECT_R_VAL) {
962 /*
963 * Role must be authorized for the type.
964 */
965 role = p->role_val_to_struct[c->role - 1];
966 if (!role || !ebitmap_get_bit(&role->types, c->type - 1))
967 /* role may not be associated with type */
968 return 0;
969
970 /*
971 * User must be authorized for the role.
972 */
973 usrdatum = p->user_val_to_struct[c->user - 1];
974 if (!usrdatum)
975 return 0;
976
977 if (!ebitmap_get_bit(&usrdatum->roles, c->role - 1))
978 /* user may not be associated with role */
979 return 0;
980 }
981
982 if (!mls_context_isvalid(p, c))
983 return 0;
984
985 return 1;
986}
987
988/*
989 * Read a MLS range structure from a policydb binary
990 * representation file.
991 */
992static int mls_read_range_helper(struct mls_range *r, void *fp)
993{
994 __le32 buf[2];
995 u32 items;
996 int rc;
997
998 rc = next_entry(buf, fp, sizeof(u32));
999 if (rc)
1000 goto out;
1001
1002 rc = -EINVAL;
1003 items = le32_to_cpu(buf[0]);
1004 if (items > ARRAY_SIZE(buf)) {
1005 pr_err("SELinux: mls: range overflow\n");
1006 goto out;
1007 }
1008
1009 rc = next_entry(buf, fp, sizeof(u32) * items);
1010 if (rc) {
1011 pr_err("SELinux: mls: truncated range\n");
1012 goto out;
1013 }
1014
1015 r->level[0].sens = le32_to_cpu(buf[0]);
1016 if (items > 1)
1017 r->level[1].sens = le32_to_cpu(buf[1]);
1018 else
1019 r->level[1].sens = r->level[0].sens;
1020
1021 rc = ebitmap_read(&r->level[0].cat, fp);
1022 if (rc) {
1023 pr_err("SELinux: mls: error reading low categories\n");
1024 goto out;
1025 }
1026 if (items > 1) {
1027 rc = ebitmap_read(&r->level[1].cat, fp);
1028 if (rc) {
1029 pr_err("SELinux: mls: error reading high categories\n");
1030 goto bad_high;
1031 }
1032 } else {
1033 rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat);
1034 if (rc) {
1035 pr_err("SELinux: mls: out of memory\n");
1036 goto bad_high;
1037 }
1038 }
1039
1040 return 0;
1041bad_high:
1042 ebitmap_destroy(&r->level[0].cat);
1043out:
1044 return rc;
1045}
1046
1047/*
1048 * Read and validate a security context structure
1049 * from a policydb binary representation file.
1050 */
1051static int context_read_and_validate(struct context *c, struct policydb *p,
1052 void *fp)
1053{
1054 __le32 buf[3];
1055 int rc;
1056
1057 rc = next_entry(buf, fp, sizeof buf);
1058 if (rc) {
1059 pr_err("SELinux: context truncated\n");
1060 goto out;
1061 }
1062 c->user = le32_to_cpu(buf[0]);
1063 c->role = le32_to_cpu(buf[1]);
1064 c->type = le32_to_cpu(buf[2]);
1065 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1066 rc = mls_read_range_helper(&c->range, fp);
1067 if (rc) {
1068 pr_err("SELinux: error reading MLS range of context\n");
1069 goto out;
1070 }
1071 }
1072
1073 rc = -EINVAL;
1074 if (!policydb_context_isvalid(p, c)) {
1075 pr_err("SELinux: invalid security context\n");
1076 context_destroy(c);
1077 goto out;
1078 }
1079 rc = 0;
1080out:
1081 return rc;
1082}
1083
1084/*
1085 * The following *_read functions are used to
1086 * read the symbol data from a policy database
1087 * binary representation file.
1088 */
1089
1090static int str_read(char **strp, gfp_t flags, void *fp, u32 len)
1091{
1092 int rc;
1093 char *str;
1094
1095 if ((len == 0) || (len == (u32)-1))
1096 return -EINVAL;
1097
1098 str = kmalloc(len + 1, flags | __GFP_NOWARN);
1099 if (!str)
1100 return -ENOMEM;
1101
1102 rc = next_entry(str, fp, len);
1103 if (rc) {
1104 kfree(str);
1105 return rc;
1106 }
1107
1108 str[len] = '\0';
1109 *strp = str;
1110 return 0;
1111}
1112
1113static int perm_read(struct policydb *p, struct symtab *s, void *fp)
1114{
1115 char *key = NULL;
1116 struct perm_datum *perdatum;
1117 int rc;
1118 __le32 buf[2];
1119 u32 len;
1120
1121 perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
1122 if (!perdatum)
1123 return -ENOMEM;
1124
1125 rc = next_entry(buf, fp, sizeof buf);
1126 if (rc)
1127 goto bad;
1128
1129 len = le32_to_cpu(buf[0]);
1130 perdatum->value = le32_to_cpu(buf[1]);
1131
1132 rc = str_read(&key, GFP_KERNEL, fp, len);
1133 if (rc)
1134 goto bad;
1135
1136 rc = symtab_insert(s, key, perdatum);
1137 if (rc)
1138 goto bad;
1139
1140 return 0;
1141bad:
1142 perm_destroy(key, perdatum, NULL);
1143 return rc;
1144}
1145
1146static int common_read(struct policydb *p, struct symtab *s, void *fp)
1147{
1148 char *key = NULL;
1149 struct common_datum *comdatum;
1150 __le32 buf[4];
1151 u32 i, len, nel;
1152 int rc;
1153
1154 comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
1155 if (!comdatum)
1156 return -ENOMEM;
1157
1158 rc = next_entry(buf, fp, sizeof buf);
1159 if (rc)
1160 goto bad;
1161
1162 len = le32_to_cpu(buf[0]);
1163 comdatum->value = le32_to_cpu(buf[1]);
1164 nel = le32_to_cpu(buf[3]);
1165
1166 rc = symtab_init(&comdatum->permissions, nel);
1167 if (rc)
1168 goto bad;
1169 comdatum->permissions.nprim = le32_to_cpu(buf[2]);
1170
1171 rc = str_read(&key, GFP_KERNEL, fp, len);
1172 if (rc)
1173 goto bad;
1174
1175 for (i = 0; i < nel; i++) {
1176 rc = perm_read(p, &comdatum->permissions, fp);
1177 if (rc)
1178 goto bad;
1179 }
1180
1181 rc = symtab_insert(s, key, comdatum);
1182 if (rc)
1183 goto bad;
1184 return 0;
1185bad:
1186 common_destroy(key, comdatum, NULL);
1187 return rc;
1188}
1189
1190static void type_set_init(struct type_set *t)
1191{
1192 ebitmap_init(&t->types);
1193 ebitmap_init(&t->negset);
1194}
1195
1196static int type_set_read(struct type_set *t, void *fp)
1197{
1198 __le32 buf[1];
1199 int rc;
1200
1201 if (ebitmap_read(&t->types, fp))
1202 return -EINVAL;
1203 if (ebitmap_read(&t->negset, fp))
1204 return -EINVAL;
1205
1206 rc = next_entry(buf, fp, sizeof(u32));
1207 if (rc < 0)
1208 return -EINVAL;
1209 t->flags = le32_to_cpu(buf[0]);
1210
1211 return 0;
1212}
1213
1214static int read_cons_helper(struct policydb *p, struct constraint_node **nodep,
1215 u32 ncons, int allowxtarget, void *fp)
1216{
1217 struct constraint_node *c, *lc;
1218 struct constraint_expr *e, *le;
1219 __le32 buf[3];
1220 u32 i, j, nexpr;
1221 int rc, depth;
1222
1223 lc = NULL;
1224 for (i = 0; i < ncons; i++) {
1225 c = kzalloc(sizeof(*c), GFP_KERNEL);
1226 if (!c)
1227 return -ENOMEM;
1228
1229 if (lc)
1230 lc->next = c;
1231 else
1232 *nodep = c;
1233
1234 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1235 if (rc)
1236 return rc;
1237 c->permissions = le32_to_cpu(buf[0]);
1238 nexpr = le32_to_cpu(buf[1]);
1239 le = NULL;
1240 depth = -1;
1241 for (j = 0; j < nexpr; j++) {
1242 e = kzalloc(sizeof(*e), GFP_KERNEL);
1243 if (!e)
1244 return -ENOMEM;
1245
1246 if (le)
1247 le->next = e;
1248 else
1249 c->expr = e;
1250
1251 rc = next_entry(buf, fp, (sizeof(u32) * 3));
1252 if (rc)
1253 return rc;
1254 e->expr_type = le32_to_cpu(buf[0]);
1255 e->attr = le32_to_cpu(buf[1]);
1256 e->op = le32_to_cpu(buf[2]);
1257
1258 switch (e->expr_type) {
1259 case CEXPR_NOT:
1260 if (depth < 0)
1261 return -EINVAL;
1262 break;
1263 case CEXPR_AND:
1264 case CEXPR_OR:
1265 if (depth < 1)
1266 return -EINVAL;
1267 depth--;
1268 break;
1269 case CEXPR_ATTR:
1270 if (depth == (CEXPR_MAXDEPTH - 1))
1271 return -EINVAL;
1272 depth++;
1273 break;
1274 case CEXPR_NAMES:
1275 if (!allowxtarget && (e->attr & CEXPR_XTARGET))
1276 return -EINVAL;
1277 if (depth == (CEXPR_MAXDEPTH - 1))
1278 return -EINVAL;
1279 depth++;
1280 rc = ebitmap_read(&e->names, fp);
1281 if (rc)
1282 return rc;
1283 if (p->policyvers >=
1284 POLICYDB_VERSION_CONSTRAINT_NAMES) {
1285 e->type_names =
1286 kzalloc(sizeof(*e->type_names),
1287 GFP_KERNEL);
1288 if (!e->type_names)
1289 return -ENOMEM;
1290 type_set_init(e->type_names);
1291 rc = type_set_read(e->type_names, fp);
1292 if (rc)
1293 return rc;
1294 }
1295 break;
1296 default:
1297 return -EINVAL;
1298 }
1299 le = e;
1300 }
1301 if (depth != 0)
1302 return -EINVAL;
1303 lc = c;
1304 }
1305
1306 return 0;
1307}
1308
1309static int class_read(struct policydb *p, struct symtab *s, void *fp)
1310{
1311 char *key = NULL;
1312 struct class_datum *cladatum;
1313 __le32 buf[6];
1314 u32 i, len, len2, ncons, nel;
1315 int rc;
1316
1317 cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
1318 if (!cladatum)
1319 return -ENOMEM;
1320
1321 rc = next_entry(buf, fp, sizeof(u32) * 6);
1322 if (rc)
1323 goto bad;
1324
1325 len = le32_to_cpu(buf[0]);
1326 len2 = le32_to_cpu(buf[1]);
1327 cladatum->value = le32_to_cpu(buf[2]);
1328 nel = le32_to_cpu(buf[4]);
1329
1330 rc = symtab_init(&cladatum->permissions, nel);
1331 if (rc)
1332 goto bad;
1333 cladatum->permissions.nprim = le32_to_cpu(buf[3]);
1334
1335 ncons = le32_to_cpu(buf[5]);
1336
1337 rc = str_read(&key, GFP_KERNEL, fp, len);
1338 if (rc)
1339 goto bad;
1340
1341 if (len2) {
1342 rc = str_read(&cladatum->comkey, GFP_KERNEL, fp, len2);
1343 if (rc)
1344 goto bad;
1345
1346 rc = -EINVAL;
1347 cladatum->comdatum =
1348 symtab_search(&p->p_commons, cladatum->comkey);
1349 if (!cladatum->comdatum) {
1350 pr_err("SELinux: unknown common %s\n",
1351 cladatum->comkey);
1352 goto bad;
1353 }
1354 }
1355 for (i = 0; i < nel; i++) {
1356 rc = perm_read(p, &cladatum->permissions, fp);
1357 if (rc)
1358 goto bad;
1359 }
1360
1361 rc = read_cons_helper(p, &cladatum->constraints, ncons, 0, fp);
1362 if (rc)
1363 goto bad;
1364
1365 if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
1366 /* grab the validatetrans rules */
1367 rc = next_entry(buf, fp, sizeof(u32));
1368 if (rc)
1369 goto bad;
1370 ncons = le32_to_cpu(buf[0]);
1371 rc = read_cons_helper(p, &cladatum->validatetrans, ncons, 1,
1372 fp);
1373 if (rc)
1374 goto bad;
1375 }
1376
1377 if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
1378 rc = next_entry(buf, fp, sizeof(u32) * 3);
1379 if (rc)
1380 goto bad;
1381
1382 cladatum->default_user = le32_to_cpu(buf[0]);
1383 cladatum->default_role = le32_to_cpu(buf[1]);
1384 cladatum->default_range = le32_to_cpu(buf[2]);
1385 }
1386
1387 if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
1388 rc = next_entry(buf, fp, sizeof(u32) * 1);
1389 if (rc)
1390 goto bad;
1391 cladatum->default_type = le32_to_cpu(buf[0]);
1392 }
1393
1394 rc = symtab_insert(s, key, cladatum);
1395 if (rc)
1396 goto bad;
1397
1398 return 0;
1399bad:
1400 cls_destroy(key, cladatum, NULL);
1401 return rc;
1402}
1403
1404static int role_read(struct policydb *p, struct symtab *s, void *fp)
1405{
1406 char *key = NULL;
1407 struct role_datum *role;
1408 int rc;
1409 unsigned int to_read = 2;
1410 __le32 buf[3];
1411 u32 len;
1412
1413 role = kzalloc(sizeof(*role), GFP_KERNEL);
1414 if (!role)
1415 return -ENOMEM;
1416
1417 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1418 to_read = 3;
1419
1420 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1421 if (rc)
1422 goto bad;
1423
1424 len = le32_to_cpu(buf[0]);
1425 role->value = le32_to_cpu(buf[1]);
1426 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1427 role->bounds = le32_to_cpu(buf[2]);
1428
1429 rc = str_read(&key, GFP_KERNEL, fp, len);
1430 if (rc)
1431 goto bad;
1432
1433 rc = ebitmap_read(&role->dominates, fp);
1434 if (rc)
1435 goto bad;
1436
1437 rc = ebitmap_read(&role->types, fp);
1438 if (rc)
1439 goto bad;
1440
1441 if (strcmp(key, OBJECT_R) == 0) {
1442 rc = -EINVAL;
1443 if (role->value != OBJECT_R_VAL) {
1444 pr_err("SELinux: Role %s has wrong value %d\n",
1445 OBJECT_R, role->value);
1446 goto bad;
1447 }
1448 rc = 0;
1449 goto bad;
1450 }
1451
1452 rc = symtab_insert(s, key, role);
1453 if (rc)
1454 goto bad;
1455 return 0;
1456bad:
1457 role_destroy(key, role, NULL);
1458 return rc;
1459}
1460
1461static int type_read(struct policydb *p, struct symtab *s, void *fp)
1462{
1463 char *key = NULL;
1464 struct type_datum *typdatum;
1465 int rc;
1466 unsigned int to_read = 3;
1467 __le32 buf[4];
1468 u32 len;
1469
1470 typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL);
1471 if (!typdatum)
1472 return -ENOMEM;
1473
1474 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1475 to_read = 4;
1476
1477 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1478 if (rc)
1479 goto bad;
1480
1481 len = le32_to_cpu(buf[0]);
1482 typdatum->value = le32_to_cpu(buf[1]);
1483 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
1484 u32 prop = le32_to_cpu(buf[2]);
1485
1486 if (prop & TYPEDATUM_PROPERTY_PRIMARY)
1487 typdatum->primary = 1;
1488 if (prop & TYPEDATUM_PROPERTY_ATTRIBUTE)
1489 typdatum->attribute = 1;
1490
1491 typdatum->bounds = le32_to_cpu(buf[3]);
1492 } else {
1493 typdatum->primary = le32_to_cpu(buf[2]);
1494 }
1495
1496 rc = str_read(&key, GFP_KERNEL, fp, len);
1497 if (rc)
1498 goto bad;
1499
1500 rc = symtab_insert(s, key, typdatum);
1501 if (rc)
1502 goto bad;
1503 return 0;
1504bad:
1505 type_destroy(key, typdatum, NULL);
1506 return rc;
1507}
1508
1509/*
1510 * Read a MLS level structure from a policydb binary
1511 * representation file.
1512 */
1513static int mls_read_level(struct mls_level *lp, void *fp)
1514{
1515 __le32 buf[1];
1516 int rc;
1517
1518 memset(lp, 0, sizeof(*lp));
1519
1520 rc = next_entry(buf, fp, sizeof buf);
1521 if (rc) {
1522 pr_err("SELinux: mls: truncated level\n");
1523 return rc;
1524 }
1525 lp->sens = le32_to_cpu(buf[0]);
1526
1527 rc = ebitmap_read(&lp->cat, fp);
1528 if (rc) {
1529 pr_err("SELinux: mls: error reading level categories\n");
1530 return rc;
1531 }
1532 return 0;
1533}
1534
1535static int user_read(struct policydb *p, struct symtab *s, void *fp)
1536{
1537 char *key = NULL;
1538 struct user_datum *usrdatum;
1539 int rc;
1540 unsigned int to_read = 2;
1541 __le32 buf[3];
1542 u32 len;
1543
1544 usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
1545 if (!usrdatum)
1546 return -ENOMEM;
1547
1548 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1549 to_read = 3;
1550
1551 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1552 if (rc)
1553 goto bad;
1554
1555 len = le32_to_cpu(buf[0]);
1556 usrdatum->value = le32_to_cpu(buf[1]);
1557 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1558 usrdatum->bounds = le32_to_cpu(buf[2]);
1559
1560 rc = str_read(&key, GFP_KERNEL, fp, len);
1561 if (rc)
1562 goto bad;
1563
1564 rc = ebitmap_read(&usrdatum->roles, fp);
1565 if (rc)
1566 goto bad;
1567
1568 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1569 rc = mls_read_range_helper(&usrdatum->range, fp);
1570 if (rc)
1571 goto bad;
1572 rc = mls_read_level(&usrdatum->dfltlevel, fp);
1573 if (rc)
1574 goto bad;
1575 }
1576
1577 rc = symtab_insert(s, key, usrdatum);
1578 if (rc)
1579 goto bad;
1580 return 0;
1581bad:
1582 user_destroy(key, usrdatum, NULL);
1583 return rc;
1584}
1585
1586static int sens_read(struct policydb *p, struct symtab *s, void *fp)
1587{
1588 char *key = NULL;
1589 struct level_datum *levdatum;
1590 int rc;
1591 __le32 buf[2];
1592 u32 len;
1593
1594 levdatum = kzalloc(sizeof(*levdatum), GFP_KERNEL);
1595 if (!levdatum)
1596 return -ENOMEM;
1597
1598 rc = next_entry(buf, fp, sizeof buf);
1599 if (rc)
1600 goto bad;
1601
1602 len = le32_to_cpu(buf[0]);
1603 levdatum->isalias = le32_to_cpu(buf[1]);
1604
1605 rc = str_read(&key, GFP_KERNEL, fp, len);
1606 if (rc)
1607 goto bad;
1608
1609 rc = -ENOMEM;
1610 levdatum->level = kmalloc(sizeof(*levdatum->level), GFP_KERNEL);
1611 if (!levdatum->level)
1612 goto bad;
1613
1614 rc = mls_read_level(levdatum->level, fp);
1615 if (rc)
1616 goto bad;
1617
1618 rc = symtab_insert(s, key, levdatum);
1619 if (rc)
1620 goto bad;
1621 return 0;
1622bad:
1623 sens_destroy(key, levdatum, NULL);
1624 return rc;
1625}
1626
1627static int cat_read(struct policydb *p, struct symtab *s, void *fp)
1628{
1629 char *key = NULL;
1630 struct cat_datum *catdatum;
1631 int rc;
1632 __le32 buf[3];
1633 u32 len;
1634
1635 catdatum = kzalloc(sizeof(*catdatum), GFP_KERNEL);
1636 if (!catdatum)
1637 return -ENOMEM;
1638
1639 rc = next_entry(buf, fp, sizeof buf);
1640 if (rc)
1641 goto bad;
1642
1643 len = le32_to_cpu(buf[0]);
1644 catdatum->value = le32_to_cpu(buf[1]);
1645 catdatum->isalias = le32_to_cpu(buf[2]);
1646
1647 rc = str_read(&key, GFP_KERNEL, fp, len);
1648 if (rc)
1649 goto bad;
1650
1651 rc = symtab_insert(s, key, catdatum);
1652 if (rc)
1653 goto bad;
1654 return 0;
1655bad:
1656 cat_destroy(key, catdatum, NULL);
1657 return rc;
1658}
1659
1660/* clang-format off */
1661static int (*const read_f[SYM_NUM])(struct policydb *p, struct symtab *s,
1662 void *fp) = {
1663 common_read,
1664 class_read,
1665 role_read,
1666 type_read,
1667 user_read,
1668 cond_read_bool,
1669 sens_read,
1670 cat_read,
1671};
1672/* clang-format on */
1673
1674static int user_bounds_sanity_check(void *key, void *datum, void *datap)
1675{
1676 struct user_datum *upper, *user;
1677 struct policydb *p = datap;
1678 int depth = 0;
1679
1680 upper = user = datum;
1681 while (upper->bounds) {
1682 struct ebitmap_node *node;
1683 u32 bit;
1684
1685 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1686 pr_err("SELinux: user %s: "
1687 "too deep or looped boundary\n",
1688 (char *)key);
1689 return -EINVAL;
1690 }
1691
1692 upper = p->user_val_to_struct[upper->bounds - 1];
1693 ebitmap_for_each_positive_bit(&user->roles, node, bit)
1694 {
1695 if (ebitmap_get_bit(&upper->roles, bit))
1696 continue;
1697
1698 pr_err("SELinux: boundary violated policy: "
1699 "user=%s role=%s bounds=%s\n",
1700 sym_name(p, SYM_USERS, user->value - 1),
1701 sym_name(p, SYM_ROLES, bit),
1702 sym_name(p, SYM_USERS, upper->value - 1));
1703
1704 return -EINVAL;
1705 }
1706 }
1707
1708 return 0;
1709}
1710
1711static int role_bounds_sanity_check(void *key, void *datum, void *datap)
1712{
1713 struct role_datum *upper, *role;
1714 struct policydb *p = datap;
1715 int depth = 0;
1716
1717 upper = role = datum;
1718 while (upper->bounds) {
1719 struct ebitmap_node *node;
1720 u32 bit;
1721
1722 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1723 pr_err("SELinux: role %s: "
1724 "too deep or looped bounds\n",
1725 (char *)key);
1726 return -EINVAL;
1727 }
1728
1729 upper = p->role_val_to_struct[upper->bounds - 1];
1730 ebitmap_for_each_positive_bit(&role->types, node, bit)
1731 {
1732 if (ebitmap_get_bit(&upper->types, bit))
1733 continue;
1734
1735 pr_err("SELinux: boundary violated policy: "
1736 "role=%s type=%s bounds=%s\n",
1737 sym_name(p, SYM_ROLES, role->value - 1),
1738 sym_name(p, SYM_TYPES, bit),
1739 sym_name(p, SYM_ROLES, upper->value - 1));
1740
1741 return -EINVAL;
1742 }
1743 }
1744
1745 return 0;
1746}
1747
1748static int type_bounds_sanity_check(void *key, void *datum, void *datap)
1749{
1750 struct type_datum *upper;
1751 struct policydb *p = datap;
1752 int depth = 0;
1753
1754 upper = datum;
1755 while (upper->bounds) {
1756 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1757 pr_err("SELinux: type %s: "
1758 "too deep or looped boundary\n",
1759 (char *)key);
1760 return -EINVAL;
1761 }
1762
1763 upper = p->type_val_to_struct[upper->bounds - 1];
1764 BUG_ON(!upper);
1765
1766 if (upper->attribute) {
1767 pr_err("SELinux: type %s: "
1768 "bounded by attribute %s\n",
1769 (char *)key,
1770 sym_name(p, SYM_TYPES, upper->value - 1));
1771 return -EINVAL;
1772 }
1773 }
1774
1775 return 0;
1776}
1777
1778static int policydb_bounds_sanity_check(struct policydb *p)
1779{
1780 int rc;
1781
1782 if (p->policyvers < POLICYDB_VERSION_BOUNDARY)
1783 return 0;
1784
1785 rc = hashtab_map(&p->p_users.table, user_bounds_sanity_check, p);
1786 if (rc)
1787 return rc;
1788
1789 rc = hashtab_map(&p->p_roles.table, role_bounds_sanity_check, p);
1790 if (rc)
1791 return rc;
1792
1793 rc = hashtab_map(&p->p_types.table, type_bounds_sanity_check, p);
1794 if (rc)
1795 return rc;
1796
1797 return 0;
1798}
1799
1800u16 string_to_security_class(struct policydb *p, const char *name)
1801{
1802 struct class_datum *cladatum;
1803
1804 cladatum = symtab_search(&p->p_classes, name);
1805 if (!cladatum)
1806 return 0;
1807
1808 return cladatum->value;
1809}
1810
1811u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name)
1812{
1813 struct class_datum *cladatum;
1814 struct perm_datum *perdatum = NULL;
1815 struct common_datum *comdatum;
1816
1817 if (!tclass || tclass > p->p_classes.nprim)
1818 return 0;
1819
1820 cladatum = p->class_val_to_struct[tclass - 1];
1821 comdatum = cladatum->comdatum;
1822 if (comdatum)
1823 perdatum = symtab_search(&comdatum->permissions, name);
1824 if (!perdatum)
1825 perdatum = symtab_search(&cladatum->permissions, name);
1826 if (!perdatum)
1827 return 0;
1828
1829 return 1U << (perdatum->value - 1);
1830}
1831
1832static int range_read(struct policydb *p, void *fp)
1833{
1834 struct range_trans *rt = NULL;
1835 struct mls_range *r = NULL;
1836 int rc;
1837 __le32 buf[2];
1838 u32 i, nel;
1839
1840 if (p->policyvers < POLICYDB_VERSION_MLS)
1841 return 0;
1842
1843 rc = next_entry(buf, fp, sizeof(u32));
1844 if (rc)
1845 return rc;
1846
1847 nel = le32_to_cpu(buf[0]);
1848
1849 rc = hashtab_init(&p->range_tr, nel);
1850 if (rc)
1851 return rc;
1852
1853 for (i = 0; i < nel; i++) {
1854 rc = -ENOMEM;
1855 rt = kzalloc(sizeof(*rt), GFP_KERNEL);
1856 if (!rt)
1857 goto out;
1858
1859 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1860 if (rc)
1861 goto out;
1862
1863 rt->source_type = le32_to_cpu(buf[0]);
1864 rt->target_type = le32_to_cpu(buf[1]);
1865 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
1866 rc = next_entry(buf, fp, sizeof(u32));
1867 if (rc)
1868 goto out;
1869 rt->target_class = le32_to_cpu(buf[0]);
1870 } else
1871 rt->target_class = p->process_class;
1872
1873 rc = -EINVAL;
1874 if (!policydb_type_isvalid(p, rt->source_type) ||
1875 !policydb_type_isvalid(p, rt->target_type) ||
1876 !policydb_class_isvalid(p, rt->target_class))
1877 goto out;
1878
1879 rc = -ENOMEM;
1880 r = kzalloc(sizeof(*r), GFP_KERNEL);
1881 if (!r)
1882 goto out;
1883
1884 rc = mls_read_range_helper(r, fp);
1885 if (rc)
1886 goto out;
1887
1888 rc = -EINVAL;
1889 if (!mls_range_isvalid(p, r)) {
1890 pr_warn("SELinux: rangetrans: invalid range\n");
1891 goto out;
1892 }
1893
1894 rc = hashtab_insert(&p->range_tr, rt, r, rangetr_key_params);
1895 if (rc)
1896 goto out;
1897
1898 rt = NULL;
1899 r = NULL;
1900 }
1901 hash_eval(&p->range_tr, "rangetr");
1902 rc = 0;
1903out:
1904 kfree(rt);
1905 kfree(r);
1906 return rc;
1907}
1908
1909static int filename_trans_read_helper_compat(struct policydb *p, void *fp)
1910{
1911 struct filename_trans_key key, *ft = NULL;
1912 struct filename_trans_datum *last, *datum = NULL;
1913 char *name = NULL;
1914 u32 len, stype, otype;
1915 __le32 buf[4];
1916 int rc;
1917
1918 /* length of the path component string */
1919 rc = next_entry(buf, fp, sizeof(u32));
1920 if (rc)
1921 return rc;
1922 len = le32_to_cpu(buf[0]);
1923
1924 /* path component string */
1925 rc = str_read(&name, GFP_KERNEL, fp, len);
1926 if (rc)
1927 return rc;
1928
1929 rc = next_entry(buf, fp, sizeof(u32) * 4);
1930 if (rc)
1931 goto out;
1932
1933 stype = le32_to_cpu(buf[0]);
1934 key.ttype = le32_to_cpu(buf[1]);
1935 key.tclass = le32_to_cpu(buf[2]);
1936 key.name = name;
1937
1938 otype = le32_to_cpu(buf[3]);
1939
1940 last = NULL;
1941 datum = policydb_filenametr_search(p, &key);
1942 while (datum) {
1943 if (unlikely(ebitmap_get_bit(&datum->stypes, stype - 1))) {
1944 /* conflicting/duplicate rules are ignored */
1945 datum = NULL;
1946 goto out;
1947 }
1948 if (likely(datum->otype == otype))
1949 break;
1950 last = datum;
1951 datum = datum->next;
1952 }
1953 if (!datum) {
1954 rc = -ENOMEM;
1955 datum = kmalloc(sizeof(*datum), GFP_KERNEL);
1956 if (!datum)
1957 goto out;
1958
1959 ebitmap_init(&datum->stypes);
1960 datum->otype = otype;
1961 datum->next = NULL;
1962
1963 if (unlikely(last)) {
1964 last->next = datum;
1965 } else {
1966 rc = -ENOMEM;
1967 ft = kmemdup(&key, sizeof(key), GFP_KERNEL);
1968 if (!ft)
1969 goto out;
1970
1971 rc = hashtab_insert(&p->filename_trans, ft, datum,
1972 filenametr_key_params);
1973 if (rc)
1974 goto out;
1975 name = NULL;
1976
1977 rc = ebitmap_set_bit(&p->filename_trans_ttypes,
1978 key.ttype, 1);
1979 if (rc)
1980 return rc;
1981 }
1982 }
1983 kfree(name);
1984 return ebitmap_set_bit(&datum->stypes, stype - 1, 1);
1985
1986out:
1987 kfree(ft);
1988 kfree(name);
1989 kfree(datum);
1990 return rc;
1991}
1992
1993static int filename_trans_read_helper(struct policydb *p, void *fp)
1994{
1995 struct filename_trans_key *ft = NULL;
1996 struct filename_trans_datum **dst, *datum, *first = NULL;
1997 char *name = NULL;
1998 u32 len, ttype, tclass, ndatum, i;
1999 __le32 buf[3];
2000 int rc;
2001
2002 /* length of the path component string */
2003 rc = next_entry(buf, fp, sizeof(u32));
2004 if (rc)
2005 return rc;
2006 len = le32_to_cpu(buf[0]);
2007
2008 /* path component string */
2009 rc = str_read(&name, GFP_KERNEL, fp, len);
2010 if (rc)
2011 return rc;
2012
2013 rc = next_entry(buf, fp, sizeof(u32) * 3);
2014 if (rc)
2015 goto out;
2016
2017 ttype = le32_to_cpu(buf[0]);
2018 tclass = le32_to_cpu(buf[1]);
2019
2020 ndatum = le32_to_cpu(buf[2]);
2021 if (ndatum == 0) {
2022 pr_err("SELinux: Filename transition key with no datum\n");
2023 rc = -ENOENT;
2024 goto out;
2025 }
2026
2027 dst = &first;
2028 for (i = 0; i < ndatum; i++) {
2029 rc = -ENOMEM;
2030 datum = kmalloc(sizeof(*datum), GFP_KERNEL);
2031 if (!datum)
2032 goto out;
2033
2034 datum->next = NULL;
2035 *dst = datum;
2036
2037 /* ebitmap_read() will at least init the bitmap */
2038 rc = ebitmap_read(&datum->stypes, fp);
2039 if (rc)
2040 goto out;
2041
2042 rc = next_entry(buf, fp, sizeof(u32));
2043 if (rc)
2044 goto out;
2045
2046 datum->otype = le32_to_cpu(buf[0]);
2047
2048 dst = &datum->next;
2049 }
2050
2051 rc = -ENOMEM;
2052 ft = kmalloc(sizeof(*ft), GFP_KERNEL);
2053 if (!ft)
2054 goto out;
2055
2056 ft->ttype = ttype;
2057 ft->tclass = tclass;
2058 ft->name = name;
2059
2060 rc = hashtab_insert(&p->filename_trans, ft, first,
2061 filenametr_key_params);
2062 if (rc == -EEXIST)
2063 pr_err("SELinux: Duplicate filename transition key\n");
2064 if (rc)
2065 goto out;
2066
2067 return ebitmap_set_bit(&p->filename_trans_ttypes, ttype, 1);
2068
2069out:
2070 kfree(ft);
2071 kfree(name);
2072 while (first) {
2073 datum = first;
2074 first = first->next;
2075
2076 ebitmap_destroy(&datum->stypes);
2077 kfree(datum);
2078 }
2079 return rc;
2080}
2081
2082static int filename_trans_read(struct policydb *p, void *fp)
2083{
2084 u32 nel, i;
2085 __le32 buf[1];
2086 int rc;
2087
2088 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
2089 return 0;
2090
2091 rc = next_entry(buf, fp, sizeof(u32));
2092 if (rc)
2093 return rc;
2094 nel = le32_to_cpu(buf[0]);
2095
2096 if (p->policyvers < POLICYDB_VERSION_COMP_FTRANS) {
2097 p->compat_filename_trans_count = nel;
2098
2099 rc = hashtab_init(&p->filename_trans, (1 << 11));
2100 if (rc)
2101 return rc;
2102
2103 for (i = 0; i < nel; i++) {
2104 rc = filename_trans_read_helper_compat(p, fp);
2105 if (rc)
2106 return rc;
2107 }
2108 } else {
2109 rc = hashtab_init(&p->filename_trans, nel);
2110 if (rc)
2111 return rc;
2112
2113 for (i = 0; i < nel; i++) {
2114 rc = filename_trans_read_helper(p, fp);
2115 if (rc)
2116 return rc;
2117 }
2118 }
2119 hash_eval(&p->filename_trans, "filenametr");
2120 return 0;
2121}
2122
2123static int genfs_read(struct policydb *p, void *fp)
2124{
2125 int rc;
2126 u32 i, j, nel, nel2, len, len2;
2127 __le32 buf[1];
2128 struct ocontext *l, *c;
2129 struct ocontext *newc = NULL;
2130 struct genfs *genfs_p, *genfs;
2131 struct genfs *newgenfs = NULL;
2132
2133 rc = next_entry(buf, fp, sizeof(u32));
2134 if (rc)
2135 return rc;
2136 nel = le32_to_cpu(buf[0]);
2137
2138 for (i = 0; i < nel; i++) {
2139 rc = next_entry(buf, fp, sizeof(u32));
2140 if (rc)
2141 goto out;
2142 len = le32_to_cpu(buf[0]);
2143
2144 rc = -ENOMEM;
2145 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
2146 if (!newgenfs)
2147 goto out;
2148
2149 rc = str_read(&newgenfs->fstype, GFP_KERNEL, fp, len);
2150 if (rc)
2151 goto out;
2152
2153 for (genfs_p = NULL, genfs = p->genfs; genfs;
2154 genfs_p = genfs, genfs = genfs->next) {
2155 rc = -EINVAL;
2156 if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
2157 pr_err("SELinux: dup genfs fstype %s\n",
2158 newgenfs->fstype);
2159 goto out;
2160 }
2161 if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
2162 break;
2163 }
2164 newgenfs->next = genfs;
2165 if (genfs_p)
2166 genfs_p->next = newgenfs;
2167 else
2168 p->genfs = newgenfs;
2169 genfs = newgenfs;
2170 newgenfs = NULL;
2171
2172 rc = next_entry(buf, fp, sizeof(u32));
2173 if (rc)
2174 goto out;
2175
2176 nel2 = le32_to_cpu(buf[0]);
2177 for (j = 0; j < nel2; j++) {
2178 rc = next_entry(buf, fp, sizeof(u32));
2179 if (rc)
2180 goto out;
2181 len = le32_to_cpu(buf[0]);
2182
2183 rc = -ENOMEM;
2184 newc = kzalloc(sizeof(*newc), GFP_KERNEL);
2185 if (!newc)
2186 goto out;
2187
2188 rc = str_read(&newc->u.name, GFP_KERNEL, fp, len);
2189 if (rc)
2190 goto out;
2191
2192 rc = next_entry(buf, fp, sizeof(u32));
2193 if (rc)
2194 goto out;
2195
2196 newc->v.sclass = le32_to_cpu(buf[0]);
2197 rc = context_read_and_validate(&newc->context[0], p,
2198 fp);
2199 if (rc)
2200 goto out;
2201
2202 for (l = NULL, c = genfs->head; c; l = c, c = c->next) {
2203 rc = -EINVAL;
2204 if (!strcmp(newc->u.name, c->u.name) &&
2205 (!c->v.sclass || !newc->v.sclass ||
2206 newc->v.sclass == c->v.sclass)) {
2207 pr_err("SELinux: dup genfs entry (%s,%s)\n",
2208 genfs->fstype, c->u.name);
2209 goto out;
2210 }
2211 len = strlen(newc->u.name);
2212 len2 = strlen(c->u.name);
2213 if (len > len2)
2214 break;
2215 }
2216
2217 newc->next = c;
2218 if (l)
2219 l->next = newc;
2220 else
2221 genfs->head = newc;
2222 newc = NULL;
2223 }
2224 }
2225 rc = 0;
2226out:
2227 if (newgenfs) {
2228 kfree(newgenfs->fstype);
2229 kfree(newgenfs);
2230 }
2231 ocontext_destroy(newc, OCON_FSUSE);
2232
2233 return rc;
2234}
2235
2236static int ocontext_read(struct policydb *p,
2237 const struct policydb_compat_info *info, void *fp)
2238{
2239 int rc;
2240 unsigned int i;
2241 u32 j, nel, len;
2242 __be64 prefixbuf[1];
2243 __le32 buf[3];
2244 struct ocontext *l, *c;
2245 u32 nodebuf[8];
2246
2247 for (i = 0; i < info->ocon_num; i++) {
2248 rc = next_entry(buf, fp, sizeof(u32));
2249 if (rc)
2250 goto out;
2251 nel = le32_to_cpu(buf[0]);
2252
2253 l = NULL;
2254 for (j = 0; j < nel; j++) {
2255 rc = -ENOMEM;
2256 c = kzalloc(sizeof(*c), GFP_KERNEL);
2257 if (!c)
2258 goto out;
2259 if (l)
2260 l->next = c;
2261 else
2262 p->ocontexts[i] = c;
2263 l = c;
2264
2265 switch (i) {
2266 case OCON_ISID:
2267 rc = next_entry(buf, fp, sizeof(u32));
2268 if (rc)
2269 goto out;
2270
2271 c->sid[0] = le32_to_cpu(buf[0]);
2272 rc = context_read_and_validate(&c->context[0],
2273 p, fp);
2274 if (rc)
2275 goto out;
2276 break;
2277 case OCON_FS:
2278 case OCON_NETIF:
2279 rc = next_entry(buf, fp, sizeof(u32));
2280 if (rc)
2281 goto out;
2282 len = le32_to_cpu(buf[0]);
2283
2284 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2285 if (rc)
2286 goto out;
2287
2288 if (i == OCON_FS)
2289 pr_warn("SELinux: void and deprecated fs ocon %s\n",
2290 c->u.name);
2291
2292 rc = context_read_and_validate(&c->context[0],
2293 p, fp);
2294 if (rc)
2295 goto out;
2296 rc = context_read_and_validate(&c->context[1],
2297 p, fp);
2298 if (rc)
2299 goto out;
2300 break;
2301 case OCON_PORT:
2302 rc = next_entry(buf, fp, sizeof(u32) * 3);
2303 if (rc)
2304 goto out;
2305 c->u.port.protocol = le32_to_cpu(buf[0]);
2306 c->u.port.low_port = le32_to_cpu(buf[1]);
2307 c->u.port.high_port = le32_to_cpu(buf[2]);
2308 rc = context_read_and_validate(&c->context[0],
2309 p, fp);
2310 if (rc)
2311 goto out;
2312 break;
2313 case OCON_NODE:
2314 rc = next_entry(nodebuf, fp, sizeof(u32) * 2);
2315 if (rc)
2316 goto out;
2317 c->u.node.addr = nodebuf[0]; /* network order */
2318 c->u.node.mask = nodebuf[1]; /* network order */
2319 rc = context_read_and_validate(&c->context[0],
2320 p, fp);
2321 if (rc)
2322 goto out;
2323 break;
2324 case OCON_FSUSE:
2325 rc = next_entry(buf, fp, sizeof(u32) * 2);
2326 if (rc)
2327 goto out;
2328
2329 rc = -EINVAL;
2330 c->v.behavior = le32_to_cpu(buf[0]);
2331 /* Determined at runtime, not in policy DB. */
2332 if (c->v.behavior == SECURITY_FS_USE_MNTPOINT)
2333 goto out;
2334 if (c->v.behavior > SECURITY_FS_USE_MAX)
2335 goto out;
2336
2337 len = le32_to_cpu(buf[1]);
2338 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2339 if (rc)
2340 goto out;
2341
2342 rc = context_read_and_validate(&c->context[0],
2343 p, fp);
2344 if (rc)
2345 goto out;
2346 break;
2347 case OCON_NODE6: {
2348 int k;
2349
2350 rc = next_entry(nodebuf, fp, sizeof(u32) * 8);
2351 if (rc)
2352 goto out;
2353 for (k = 0; k < 4; k++)
2354 c->u.node6.addr[k] = nodebuf[k];
2355 for (k = 0; k < 4; k++)
2356 c->u.node6.mask[k] = nodebuf[k + 4];
2357 rc = context_read_and_validate(&c->context[0],
2358 p, fp);
2359 if (rc)
2360 goto out;
2361 break;
2362 }
2363 case OCON_IBPKEY: {
2364 u32 pkey_lo, pkey_hi;
2365
2366 rc = next_entry(prefixbuf, fp, sizeof(u64));
2367 if (rc)
2368 goto out;
2369
2370 /* we need to have subnet_prefix in CPU order */
2371 c->u.ibpkey.subnet_prefix =
2372 be64_to_cpu(prefixbuf[0]);
2373
2374 rc = next_entry(buf, fp, sizeof(u32) * 2);
2375 if (rc)
2376 goto out;
2377
2378 pkey_lo = le32_to_cpu(buf[0]);
2379 pkey_hi = le32_to_cpu(buf[1]);
2380
2381 if (pkey_lo > U16_MAX || pkey_hi > U16_MAX) {
2382 rc = -EINVAL;
2383 goto out;
2384 }
2385
2386 c->u.ibpkey.low_pkey = pkey_lo;
2387 c->u.ibpkey.high_pkey = pkey_hi;
2388
2389 rc = context_read_and_validate(&c->context[0],
2390 p, fp);
2391 if (rc)
2392 goto out;
2393 break;
2394 }
2395 case OCON_IBENDPORT: {
2396 u32 port;
2397
2398 rc = next_entry(buf, fp, sizeof(u32) * 2);
2399 if (rc)
2400 goto out;
2401 len = le32_to_cpu(buf[0]);
2402
2403 rc = str_read(&c->u.ibendport.dev_name,
2404 GFP_KERNEL, fp, len);
2405 if (rc)
2406 goto out;
2407
2408 port = le32_to_cpu(buf[1]);
2409 if (port > U8_MAX || port == 0) {
2410 rc = -EINVAL;
2411 goto out;
2412 }
2413
2414 c->u.ibendport.port = port;
2415
2416 rc = context_read_and_validate(&c->context[0],
2417 p, fp);
2418 if (rc)
2419 goto out;
2420 break;
2421 } /* end case */
2422 } /* end switch */
2423 }
2424 }
2425 rc = 0;
2426out:
2427 return rc;
2428}
2429
2430/*
2431 * Read the configuration data from a policy database binary
2432 * representation file into a policy database structure.
2433 */
2434int policydb_read(struct policydb *p, void *fp)
2435{
2436 struct role_allow *ra, *lra;
2437 struct role_trans_key *rtk = NULL;
2438 struct role_trans_datum *rtd = NULL;
2439 int rc;
2440 __le32 buf[4];
2441 u32 i, j, len, nprim, nel, perm;
2442
2443 char *policydb_str;
2444 const struct policydb_compat_info *info;
2445
2446 policydb_init(p);
2447
2448 /* Read the magic number and string length. */
2449 rc = next_entry(buf, fp, sizeof(u32) * 2);
2450 if (rc)
2451 goto bad;
2452
2453 rc = -EINVAL;
2454 if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
2455 pr_err("SELinux: policydb magic number 0x%x does "
2456 "not match expected magic number 0x%x\n",
2457 le32_to_cpu(buf[0]), POLICYDB_MAGIC);
2458 goto bad;
2459 }
2460
2461 rc = -EINVAL;
2462 len = le32_to_cpu(buf[1]);
2463 if (len != strlen(POLICYDB_STRING)) {
2464 pr_err("SELinux: policydb string length %d does not "
2465 "match expected length %zu\n",
2466 len, strlen(POLICYDB_STRING));
2467 goto bad;
2468 }
2469
2470 rc = -ENOMEM;
2471 policydb_str = kmalloc(len + 1, GFP_KERNEL);
2472 if (!policydb_str) {
2473 pr_err("SELinux: unable to allocate memory for policydb "
2474 "string of length %d\n",
2475 len);
2476 goto bad;
2477 }
2478
2479 rc = next_entry(policydb_str, fp, len);
2480 if (rc) {
2481 pr_err("SELinux: truncated policydb string identifier\n");
2482 kfree(policydb_str);
2483 goto bad;
2484 }
2485
2486 rc = -EINVAL;
2487 policydb_str[len] = '\0';
2488 if (strcmp(policydb_str, POLICYDB_STRING)) {
2489 pr_err("SELinux: policydb string %s does not match "
2490 "my string %s\n",
2491 policydb_str, POLICYDB_STRING);
2492 kfree(policydb_str);
2493 goto bad;
2494 }
2495 /* Done with policydb_str. */
2496 kfree(policydb_str);
2497 policydb_str = NULL;
2498
2499 /* Read the version and table sizes. */
2500 rc = next_entry(buf, fp, sizeof(u32) * 4);
2501 if (rc)
2502 goto bad;
2503
2504 rc = -EINVAL;
2505 p->policyvers = le32_to_cpu(buf[0]);
2506 if (p->policyvers < POLICYDB_VERSION_MIN ||
2507 p->policyvers > POLICYDB_VERSION_MAX) {
2508 pr_err("SELinux: policydb version %d does not match "
2509 "my version range %d-%d\n",
2510 le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN,
2511 POLICYDB_VERSION_MAX);
2512 goto bad;
2513 }
2514
2515 if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
2516 p->mls_enabled = 1;
2517
2518 rc = -EINVAL;
2519 if (p->policyvers < POLICYDB_VERSION_MLS) {
2520 pr_err("SELinux: security policydb version %d "
2521 "(MLS) not backwards compatible\n",
2522 p->policyvers);
2523 goto bad;
2524 }
2525 }
2526 p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
2527 p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
2528
2529 if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
2530 rc = ebitmap_read(&p->policycaps, fp);
2531 if (rc)
2532 goto bad;
2533 }
2534
2535 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
2536 rc = ebitmap_read(&p->permissive_map, fp);
2537 if (rc)
2538 goto bad;
2539 }
2540
2541 rc = -EINVAL;
2542 info = policydb_lookup_compat(p->policyvers);
2543 if (!info) {
2544 pr_err("SELinux: unable to find policy compat info "
2545 "for version %d\n",
2546 p->policyvers);
2547 goto bad;
2548 }
2549
2550 rc = -EINVAL;
2551 if (le32_to_cpu(buf[2]) != info->sym_num ||
2552 le32_to_cpu(buf[3]) != info->ocon_num) {
2553 pr_err("SELinux: policydb table sizes (%d,%d) do "
2554 "not match mine (%d,%d)\n",
2555 le32_to_cpu(buf[2]), le32_to_cpu(buf[3]), info->sym_num,
2556 info->ocon_num);
2557 goto bad;
2558 }
2559
2560 for (i = 0; i < info->sym_num; i++) {
2561 rc = next_entry(buf, fp, sizeof(u32) * 2);
2562 if (rc)
2563 goto bad;
2564 nprim = le32_to_cpu(buf[0]);
2565 nel = le32_to_cpu(buf[1]);
2566
2567 rc = symtab_init(&p->symtab[i], nel);
2568 if (rc)
2569 goto out;
2570
2571 if (i == SYM_ROLES) {
2572 rc = roles_init(p);
2573 if (rc)
2574 goto out;
2575 }
2576
2577 for (j = 0; j < nel; j++) {
2578 rc = read_f[i](p, &p->symtab[i], fp);
2579 if (rc)
2580 goto bad;
2581 }
2582
2583 p->symtab[i].nprim = nprim;
2584 }
2585
2586 rc = -EINVAL;
2587 p->process_class = string_to_security_class(p, "process");
2588 if (!p->process_class) {
2589 pr_err("SELinux: process class is required, not defined in policy\n");
2590 goto bad;
2591 }
2592
2593 rc = avtab_read(&p->te_avtab, fp, p);
2594 if (rc)
2595 goto bad;
2596
2597 if (p->policyvers >= POLICYDB_VERSION_BOOL) {
2598 rc = cond_read_list(p, fp);
2599 if (rc)
2600 goto bad;
2601 }
2602
2603 rc = next_entry(buf, fp, sizeof(u32));
2604 if (rc)
2605 goto bad;
2606 nel = le32_to_cpu(buf[0]);
2607
2608 rc = hashtab_init(&p->role_tr, nel);
2609 if (rc)
2610 goto bad;
2611 for (i = 0; i < nel; i++) {
2612 rc = -ENOMEM;
2613 rtk = kmalloc(sizeof(*rtk), GFP_KERNEL);
2614 if (!rtk)
2615 goto bad;
2616
2617 rc = -ENOMEM;
2618 rtd = kmalloc(sizeof(*rtd), GFP_KERNEL);
2619 if (!rtd)
2620 goto bad;
2621
2622 rc = next_entry(buf, fp, sizeof(u32) * 3);
2623 if (rc)
2624 goto bad;
2625
2626 rtk->role = le32_to_cpu(buf[0]);
2627 rtk->type = le32_to_cpu(buf[1]);
2628 rtd->new_role = le32_to_cpu(buf[2]);
2629 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2630 rc = next_entry(buf, fp, sizeof(u32));
2631 if (rc)
2632 goto bad;
2633 rtk->tclass = le32_to_cpu(buf[0]);
2634 } else
2635 rtk->tclass = p->process_class;
2636
2637 rc = -EINVAL;
2638 if (!policydb_role_isvalid(p, rtk->role) ||
2639 !policydb_type_isvalid(p, rtk->type) ||
2640 !policydb_class_isvalid(p, rtk->tclass) ||
2641 !policydb_role_isvalid(p, rtd->new_role))
2642 goto bad;
2643
2644 rc = hashtab_insert(&p->role_tr, rtk, rtd, roletr_key_params);
2645 if (rc)
2646 goto bad;
2647
2648 rtk = NULL;
2649 rtd = NULL;
2650 }
2651
2652 rc = next_entry(buf, fp, sizeof(u32));
2653 if (rc)
2654 goto bad;
2655 nel = le32_to_cpu(buf[0]);
2656 lra = NULL;
2657 for (i = 0; i < nel; i++) {
2658 rc = -ENOMEM;
2659 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
2660 if (!ra)
2661 goto bad;
2662 if (lra)
2663 lra->next = ra;
2664 else
2665 p->role_allow = ra;
2666 rc = next_entry(buf, fp, sizeof(u32) * 2);
2667 if (rc)
2668 goto bad;
2669
2670 rc = -EINVAL;
2671 ra->role = le32_to_cpu(buf[0]);
2672 ra->new_role = le32_to_cpu(buf[1]);
2673 if (!policydb_role_isvalid(p, ra->role) ||
2674 !policydb_role_isvalid(p, ra->new_role))
2675 goto bad;
2676 lra = ra;
2677 }
2678
2679 rc = filename_trans_read(p, fp);
2680 if (rc)
2681 goto bad;
2682
2683 rc = policydb_index(p);
2684 if (rc)
2685 goto bad;
2686
2687 rc = -EINVAL;
2688 perm = string_to_av_perm(p, p->process_class, "transition");
2689 if (!perm) {
2690 pr_err("SELinux: process transition permission is required, not defined in policy\n");
2691 goto bad;
2692 }
2693 p->process_trans_perms = perm;
2694 perm = string_to_av_perm(p, p->process_class, "dyntransition");
2695 if (!perm) {
2696 pr_err("SELinux: process dyntransition permission is required, not defined in policy\n");
2697 goto bad;
2698 }
2699 p->process_trans_perms |= perm;
2700
2701 rc = ocontext_read(p, info, fp);
2702 if (rc)
2703 goto bad;
2704
2705 rc = genfs_read(p, fp);
2706 if (rc)
2707 goto bad;
2708
2709 rc = range_read(p, fp);
2710 if (rc)
2711 goto bad;
2712
2713 rc = -ENOMEM;
2714 p->type_attr_map_array = kvcalloc(
2715 p->p_types.nprim, sizeof(*p->type_attr_map_array), GFP_KERNEL);
2716 if (!p->type_attr_map_array)
2717 goto bad;
2718
2719 /* just in case ebitmap_init() becomes more than just a memset(0): */
2720 for (i = 0; i < p->p_types.nprim; i++)
2721 ebitmap_init(&p->type_attr_map_array[i]);
2722
2723 for (i = 0; i < p->p_types.nprim; i++) {
2724 struct ebitmap *e = &p->type_attr_map_array[i];
2725
2726 if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
2727 rc = ebitmap_read(e, fp);
2728 if (rc)
2729 goto bad;
2730 }
2731 /* add the type itself as the degenerate case */
2732 rc = ebitmap_set_bit(e, i, 1);
2733 if (rc)
2734 goto bad;
2735 }
2736
2737 rc = policydb_bounds_sanity_check(p);
2738 if (rc)
2739 goto bad;
2740
2741 rc = 0;
2742out:
2743 return rc;
2744bad:
2745 kfree(rtk);
2746 kfree(rtd);
2747 policydb_destroy(p);
2748 goto out;
2749}
2750
2751/*
2752 * Write a MLS level structure to a policydb binary
2753 * representation file.
2754 */
2755static int mls_write_level(struct mls_level *l, void *fp)
2756{
2757 __le32 buf[1];
2758 int rc;
2759
2760 buf[0] = cpu_to_le32(l->sens);
2761 rc = put_entry(buf, sizeof(u32), 1, fp);
2762 if (rc)
2763 return rc;
2764
2765 rc = ebitmap_write(&l->cat, fp);
2766 if (rc)
2767 return rc;
2768
2769 return 0;
2770}
2771
2772/*
2773 * Write a MLS range structure to a policydb binary
2774 * representation file.
2775 */
2776static int mls_write_range_helper(struct mls_range *r, void *fp)
2777{
2778 __le32 buf[3];
2779 size_t items;
2780 int rc, eq;
2781
2782 eq = mls_level_eq(&r->level[1], &r->level[0]);
2783
2784 if (eq)
2785 items = 2;
2786 else
2787 items = 3;
2788 buf[0] = cpu_to_le32(items - 1);
2789 buf[1] = cpu_to_le32(r->level[0].sens);
2790 if (!eq)
2791 buf[2] = cpu_to_le32(r->level[1].sens);
2792
2793 BUG_ON(items > ARRAY_SIZE(buf));
2794
2795 rc = put_entry(buf, sizeof(u32), items, fp);
2796 if (rc)
2797 return rc;
2798
2799 rc = ebitmap_write(&r->level[0].cat, fp);
2800 if (rc)
2801 return rc;
2802 if (!eq) {
2803 rc = ebitmap_write(&r->level[1].cat, fp);
2804 if (rc)
2805 return rc;
2806 }
2807
2808 return 0;
2809}
2810
2811static int sens_write(void *vkey, void *datum, void *ptr)
2812{
2813 char *key = vkey;
2814 struct level_datum *levdatum = datum;
2815 struct policy_data *pd = ptr;
2816 void *fp = pd->fp;
2817 __le32 buf[2];
2818 size_t len;
2819 int rc;
2820
2821 len = strlen(key);
2822 buf[0] = cpu_to_le32(len);
2823 buf[1] = cpu_to_le32(levdatum->isalias);
2824 rc = put_entry(buf, sizeof(u32), 2, fp);
2825 if (rc)
2826 return rc;
2827
2828 rc = put_entry(key, 1, len, fp);
2829 if (rc)
2830 return rc;
2831
2832 rc = mls_write_level(levdatum->level, fp);
2833 if (rc)
2834 return rc;
2835
2836 return 0;
2837}
2838
2839static int cat_write(void *vkey, void *datum, void *ptr)
2840{
2841 char *key = vkey;
2842 struct cat_datum *catdatum = datum;
2843 struct policy_data *pd = ptr;
2844 void *fp = pd->fp;
2845 __le32 buf[3];
2846 size_t len;
2847 int rc;
2848
2849 len = strlen(key);
2850 buf[0] = cpu_to_le32(len);
2851 buf[1] = cpu_to_le32(catdatum->value);
2852 buf[2] = cpu_to_le32(catdatum->isalias);
2853 rc = put_entry(buf, sizeof(u32), 3, fp);
2854 if (rc)
2855 return rc;
2856
2857 rc = put_entry(key, 1, len, fp);
2858 if (rc)
2859 return rc;
2860
2861 return 0;
2862}
2863
2864static int role_trans_write_one(void *key, void *datum, void *ptr)
2865{
2866 struct role_trans_key *rtk = key;
2867 struct role_trans_datum *rtd = datum;
2868 struct policy_data *pd = ptr;
2869 void *fp = pd->fp;
2870 struct policydb *p = pd->p;
2871 __le32 buf[3];
2872 int rc;
2873
2874 buf[0] = cpu_to_le32(rtk->role);
2875 buf[1] = cpu_to_le32(rtk->type);
2876 buf[2] = cpu_to_le32(rtd->new_role);
2877 rc = put_entry(buf, sizeof(u32), 3, fp);
2878 if (rc)
2879 return rc;
2880 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2881 buf[0] = cpu_to_le32(rtk->tclass);
2882 rc = put_entry(buf, sizeof(u32), 1, fp);
2883 if (rc)
2884 return rc;
2885 }
2886 return 0;
2887}
2888
2889static int role_trans_write(struct policydb *p, void *fp)
2890{
2891 struct policy_data pd = { .p = p, .fp = fp };
2892 __le32 buf[1];
2893 int rc;
2894
2895 buf[0] = cpu_to_le32(p->role_tr.nel);
2896 rc = put_entry(buf, sizeof(u32), 1, fp);
2897 if (rc)
2898 return rc;
2899
2900 return hashtab_map(&p->role_tr, role_trans_write_one, &pd);
2901}
2902
2903static int role_allow_write(struct role_allow *r, void *fp)
2904{
2905 struct role_allow *ra;
2906 __le32 buf[2];
2907 size_t nel;
2908 int rc;
2909
2910 nel = 0;
2911 for (ra = r; ra; ra = ra->next)
2912 nel++;
2913 buf[0] = cpu_to_le32(nel);
2914 rc = put_entry(buf, sizeof(u32), 1, fp);
2915 if (rc)
2916 return rc;
2917 for (ra = r; ra; ra = ra->next) {
2918 buf[0] = cpu_to_le32(ra->role);
2919 buf[1] = cpu_to_le32(ra->new_role);
2920 rc = put_entry(buf, sizeof(u32), 2, fp);
2921 if (rc)
2922 return rc;
2923 }
2924 return 0;
2925}
2926
2927/*
2928 * Write a security context structure
2929 * to a policydb binary representation file.
2930 */
2931static int context_write(struct policydb *p, struct context *c, void *fp)
2932{
2933 int rc;
2934 __le32 buf[3];
2935
2936 buf[0] = cpu_to_le32(c->user);
2937 buf[1] = cpu_to_le32(c->role);
2938 buf[2] = cpu_to_le32(c->type);
2939
2940 rc = put_entry(buf, sizeof(u32), 3, fp);
2941 if (rc)
2942 return rc;
2943
2944 rc = mls_write_range_helper(&c->range, fp);
2945 if (rc)
2946 return rc;
2947
2948 return 0;
2949}
2950
2951/*
2952 * The following *_write functions are used to
2953 * write the symbol data to a policy database
2954 * binary representation file.
2955 */
2956
2957static int perm_write(void *vkey, void *datum, void *fp)
2958{
2959 char *key = vkey;
2960 struct perm_datum *perdatum = datum;
2961 __le32 buf[2];
2962 size_t len;
2963 int rc;
2964
2965 len = strlen(key);
2966 buf[0] = cpu_to_le32(len);
2967 buf[1] = cpu_to_le32(perdatum->value);
2968 rc = put_entry(buf, sizeof(u32), 2, fp);
2969 if (rc)
2970 return rc;
2971
2972 rc = put_entry(key, 1, len, fp);
2973 if (rc)
2974 return rc;
2975
2976 return 0;
2977}
2978
2979static int common_write(void *vkey, void *datum, void *ptr)
2980{
2981 char *key = vkey;
2982 struct common_datum *comdatum = datum;
2983 struct policy_data *pd = ptr;
2984 void *fp = pd->fp;
2985 __le32 buf[4];
2986 size_t len;
2987 int rc;
2988
2989 len = strlen(key);
2990 buf[0] = cpu_to_le32(len);
2991 buf[1] = cpu_to_le32(comdatum->value);
2992 buf[2] = cpu_to_le32(comdatum->permissions.nprim);
2993 buf[3] = cpu_to_le32(comdatum->permissions.table.nel);
2994 rc = put_entry(buf, sizeof(u32), 4, fp);
2995 if (rc)
2996 return rc;
2997
2998 rc = put_entry(key, 1, len, fp);
2999 if (rc)
3000 return rc;
3001
3002 rc = hashtab_map(&comdatum->permissions.table, perm_write, fp);
3003 if (rc)
3004 return rc;
3005
3006 return 0;
3007}
3008
3009static int type_set_write(struct type_set *t, void *fp)
3010{
3011 int rc;
3012 __le32 buf[1];
3013
3014 if (ebitmap_write(&t->types, fp))
3015 return -EINVAL;
3016 if (ebitmap_write(&t->negset, fp))
3017 return -EINVAL;
3018
3019 buf[0] = cpu_to_le32(t->flags);
3020 rc = put_entry(buf, sizeof(u32), 1, fp);
3021 if (rc)
3022 return -EINVAL;
3023
3024 return 0;
3025}
3026
3027static int write_cons_helper(struct policydb *p, struct constraint_node *node,
3028 void *fp)
3029{
3030 struct constraint_node *c;
3031 struct constraint_expr *e;
3032 __le32 buf[3];
3033 u32 nel;
3034 int rc;
3035
3036 for (c = node; c; c = c->next) {
3037 nel = 0;
3038 for (e = c->expr; e; e = e->next)
3039 nel++;
3040 buf[0] = cpu_to_le32(c->permissions);
3041 buf[1] = cpu_to_le32(nel);
3042 rc = put_entry(buf, sizeof(u32), 2, fp);
3043 if (rc)
3044 return rc;
3045 for (e = c->expr; e; e = e->next) {
3046 buf[0] = cpu_to_le32(e->expr_type);
3047 buf[1] = cpu_to_le32(e->attr);
3048 buf[2] = cpu_to_le32(e->op);
3049 rc = put_entry(buf, sizeof(u32), 3, fp);
3050 if (rc)
3051 return rc;
3052
3053 switch (e->expr_type) {
3054 case CEXPR_NAMES:
3055 rc = ebitmap_write(&e->names, fp);
3056 if (rc)
3057 return rc;
3058 if (p->policyvers >=
3059 POLICYDB_VERSION_CONSTRAINT_NAMES) {
3060 rc = type_set_write(e->type_names, fp);
3061 if (rc)
3062 return rc;
3063 }
3064 break;
3065 default:
3066 break;
3067 }
3068 }
3069 }
3070
3071 return 0;
3072}
3073
3074static int class_write(void *vkey, void *datum, void *ptr)
3075{
3076 char *key = vkey;
3077 struct class_datum *cladatum = datum;
3078 struct policy_data *pd = ptr;
3079 void *fp = pd->fp;
3080 struct policydb *p = pd->p;
3081 struct constraint_node *c;
3082 __le32 buf[6];
3083 u32 ncons;
3084 size_t len, len2;
3085 int rc;
3086
3087 len = strlen(key);
3088 if (cladatum->comkey)
3089 len2 = strlen(cladatum->comkey);
3090 else
3091 len2 = 0;
3092
3093 ncons = 0;
3094 for (c = cladatum->constraints; c; c = c->next)
3095 ncons++;
3096
3097 buf[0] = cpu_to_le32(len);
3098 buf[1] = cpu_to_le32(len2);
3099 buf[2] = cpu_to_le32(cladatum->value);
3100 buf[3] = cpu_to_le32(cladatum->permissions.nprim);
3101 buf[4] = cpu_to_le32(cladatum->permissions.table.nel);
3102 buf[5] = cpu_to_le32(ncons);
3103 rc = put_entry(buf, sizeof(u32), 6, fp);
3104 if (rc)
3105 return rc;
3106
3107 rc = put_entry(key, 1, len, fp);
3108 if (rc)
3109 return rc;
3110
3111 if (cladatum->comkey) {
3112 rc = put_entry(cladatum->comkey, 1, len2, fp);
3113 if (rc)
3114 return rc;
3115 }
3116
3117 rc = hashtab_map(&cladatum->permissions.table, perm_write, fp);
3118 if (rc)
3119 return rc;
3120
3121 rc = write_cons_helper(p, cladatum->constraints, fp);
3122 if (rc)
3123 return rc;
3124
3125 /* write out the validatetrans rule */
3126 ncons = 0;
3127 for (c = cladatum->validatetrans; c; c = c->next)
3128 ncons++;
3129
3130 buf[0] = cpu_to_le32(ncons);
3131 rc = put_entry(buf, sizeof(u32), 1, fp);
3132 if (rc)
3133 return rc;
3134
3135 rc = write_cons_helper(p, cladatum->validatetrans, fp);
3136 if (rc)
3137 return rc;
3138
3139 if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
3140 buf[0] = cpu_to_le32(cladatum->default_user);
3141 buf[1] = cpu_to_le32(cladatum->default_role);
3142 buf[2] = cpu_to_le32(cladatum->default_range);
3143
3144 rc = put_entry(buf, sizeof(uint32_t), 3, fp);
3145 if (rc)
3146 return rc;
3147 }
3148
3149 if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
3150 buf[0] = cpu_to_le32(cladatum->default_type);
3151 rc = put_entry(buf, sizeof(uint32_t), 1, fp);
3152 if (rc)
3153 return rc;
3154 }
3155
3156 return 0;
3157}
3158
3159static int role_write(void *vkey, void *datum, void *ptr)
3160{
3161 char *key = vkey;
3162 struct role_datum *role = datum;
3163 struct policy_data *pd = ptr;
3164 void *fp = pd->fp;
3165 struct policydb *p = pd->p;
3166 __le32 buf[3];
3167 size_t items, len;
3168 int rc;
3169
3170 len = strlen(key);
3171 items = 0;
3172 buf[items++] = cpu_to_le32(len);
3173 buf[items++] = cpu_to_le32(role->value);
3174 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
3175 buf[items++] = cpu_to_le32(role->bounds);
3176
3177 BUG_ON(items > ARRAY_SIZE(buf));
3178
3179 rc = put_entry(buf, sizeof(u32), items, fp);
3180 if (rc)
3181 return rc;
3182
3183 rc = put_entry(key, 1, len, fp);
3184 if (rc)
3185 return rc;
3186
3187 rc = ebitmap_write(&role->dominates, fp);
3188 if (rc)
3189 return rc;
3190
3191 rc = ebitmap_write(&role->types, fp);
3192 if (rc)
3193 return rc;
3194
3195 return 0;
3196}
3197
3198static int type_write(void *vkey, void *datum, void *ptr)
3199{
3200 char *key = vkey;
3201 struct type_datum *typdatum = datum;
3202 struct policy_data *pd = ptr;
3203 struct policydb *p = pd->p;
3204 void *fp = pd->fp;
3205 __le32 buf[4];
3206 int rc;
3207 size_t items, len;
3208
3209 len = strlen(key);
3210 items = 0;
3211 buf[items++] = cpu_to_le32(len);
3212 buf[items++] = cpu_to_le32(typdatum->value);
3213 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
3214 u32 properties = 0;
3215
3216 if (typdatum->primary)
3217 properties |= TYPEDATUM_PROPERTY_PRIMARY;
3218
3219 if (typdatum->attribute)
3220 properties |= TYPEDATUM_PROPERTY_ATTRIBUTE;
3221
3222 buf[items++] = cpu_to_le32(properties);
3223 buf[items++] = cpu_to_le32(typdatum->bounds);
3224 } else {
3225 buf[items++] = cpu_to_le32(typdatum->primary);
3226 }
3227 BUG_ON(items > ARRAY_SIZE(buf));
3228 rc = put_entry(buf, sizeof(u32), items, fp);
3229 if (rc)
3230 return rc;
3231
3232 rc = put_entry(key, 1, len, fp);
3233 if (rc)
3234 return rc;
3235
3236 return 0;
3237}
3238
3239static int user_write(void *vkey, void *datum, void *ptr)
3240{
3241 char *key = vkey;
3242 struct user_datum *usrdatum = datum;
3243 struct policy_data *pd = ptr;
3244 struct policydb *p = pd->p;
3245 void *fp = pd->fp;
3246 __le32 buf[3];
3247 size_t items, len;
3248 int rc;
3249
3250 len = strlen(key);
3251 items = 0;
3252 buf[items++] = cpu_to_le32(len);
3253 buf[items++] = cpu_to_le32(usrdatum->value);
3254 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
3255 buf[items++] = cpu_to_le32(usrdatum->bounds);
3256 BUG_ON(items > ARRAY_SIZE(buf));
3257 rc = put_entry(buf, sizeof(u32), items, fp);
3258 if (rc)
3259 return rc;
3260
3261 rc = put_entry(key, 1, len, fp);
3262 if (rc)
3263 return rc;
3264
3265 rc = ebitmap_write(&usrdatum->roles, fp);
3266 if (rc)
3267 return rc;
3268
3269 rc = mls_write_range_helper(&usrdatum->range, fp);
3270 if (rc)
3271 return rc;
3272
3273 rc = mls_write_level(&usrdatum->dfltlevel, fp);
3274 if (rc)
3275 return rc;
3276
3277 return 0;
3278}
3279
3280/* clang-format off */
3281static int (*const write_f[SYM_NUM])(void *key, void *datum, void *datap) = {
3282 common_write,
3283 class_write,
3284 role_write,
3285 type_write,
3286 user_write,
3287 cond_write_bool,
3288 sens_write,
3289 cat_write,
3290};
3291/* clang-format on */
3292
3293static int ocontext_write(struct policydb *p,
3294 const struct policydb_compat_info *info, void *fp)
3295{
3296 unsigned int i, j;
3297 int rc;
3298 size_t nel, len;
3299 __be64 prefixbuf[1];
3300 __le32 buf[3];
3301 u32 nodebuf[8];
3302 struct ocontext *c;
3303 for (i = 0; i < info->ocon_num; i++) {
3304 nel = 0;
3305 for (c = p->ocontexts[i]; c; c = c->next)
3306 nel++;
3307 buf[0] = cpu_to_le32(nel);
3308 rc = put_entry(buf, sizeof(u32), 1, fp);
3309 if (rc)
3310 return rc;
3311 for (c = p->ocontexts[i]; c; c = c->next) {
3312 switch (i) {
3313 case OCON_ISID:
3314 buf[0] = cpu_to_le32(c->sid[0]);
3315 rc = put_entry(buf, sizeof(u32), 1, fp);
3316 if (rc)
3317 return rc;
3318 rc = context_write(p, &c->context[0], fp);
3319 if (rc)
3320 return rc;
3321 break;
3322 case OCON_FS:
3323 case OCON_NETIF:
3324 len = strlen(c->u.name);
3325 buf[0] = cpu_to_le32(len);
3326 rc = put_entry(buf, sizeof(u32), 1, fp);
3327 if (rc)
3328 return rc;
3329 rc = put_entry(c->u.name, 1, len, fp);
3330 if (rc)
3331 return rc;
3332 rc = context_write(p, &c->context[0], fp);
3333 if (rc)
3334 return rc;
3335 rc = context_write(p, &c->context[1], fp);
3336 if (rc)
3337 return rc;
3338 break;
3339 case OCON_PORT:
3340 buf[0] = cpu_to_le32(c->u.port.protocol);
3341 buf[1] = cpu_to_le32(c->u.port.low_port);
3342 buf[2] = cpu_to_le32(c->u.port.high_port);
3343 rc = put_entry(buf, sizeof(u32), 3, fp);
3344 if (rc)
3345 return rc;
3346 rc = context_write(p, &c->context[0], fp);
3347 if (rc)
3348 return rc;
3349 break;
3350 case OCON_NODE:
3351 nodebuf[0] = c->u.node.addr; /* network order */
3352 nodebuf[1] = c->u.node.mask; /* network order */
3353 rc = put_entry(nodebuf, sizeof(u32), 2, fp);
3354 if (rc)
3355 return rc;
3356 rc = context_write(p, &c->context[0], fp);
3357 if (rc)
3358 return rc;
3359 break;
3360 case OCON_FSUSE:
3361 buf[0] = cpu_to_le32(c->v.behavior);
3362 len = strlen(c->u.name);
3363 buf[1] = cpu_to_le32(len);
3364 rc = put_entry(buf, sizeof(u32), 2, fp);
3365 if (rc)
3366 return rc;
3367 rc = put_entry(c->u.name, 1, len, fp);
3368 if (rc)
3369 return rc;
3370 rc = context_write(p, &c->context[0], fp);
3371 if (rc)
3372 return rc;
3373 break;
3374 case OCON_NODE6:
3375 for (j = 0; j < 4; j++)
3376 nodebuf[j] =
3377 c->u.node6.addr
3378 [j]; /* network order */
3379 for (j = 0; j < 4; j++)
3380 nodebuf[j + 4] =
3381 c->u.node6.mask
3382 [j]; /* network order */
3383 rc = put_entry(nodebuf, sizeof(u32), 8, fp);
3384 if (rc)
3385 return rc;
3386 rc = context_write(p, &c->context[0], fp);
3387 if (rc)
3388 return rc;
3389 break;
3390 case OCON_IBPKEY:
3391 /* subnet_prefix is in CPU order */
3392 prefixbuf[0] =
3393 cpu_to_be64(c->u.ibpkey.subnet_prefix);
3394
3395 rc = put_entry(prefixbuf, sizeof(u64), 1, fp);
3396 if (rc)
3397 return rc;
3398
3399 buf[0] = cpu_to_le32(c->u.ibpkey.low_pkey);
3400 buf[1] = cpu_to_le32(c->u.ibpkey.high_pkey);
3401
3402 rc = put_entry(buf, sizeof(u32), 2, fp);
3403 if (rc)
3404 return rc;
3405 rc = context_write(p, &c->context[0], fp);
3406 if (rc)
3407 return rc;
3408 break;
3409 case OCON_IBENDPORT:
3410 len = strlen(c->u.ibendport.dev_name);
3411 buf[0] = cpu_to_le32(len);
3412 buf[1] = cpu_to_le32(c->u.ibendport.port);
3413 rc = put_entry(buf, sizeof(u32), 2, fp);
3414 if (rc)
3415 return rc;
3416 rc = put_entry(c->u.ibendport.dev_name, 1, len,
3417 fp);
3418 if (rc)
3419 return rc;
3420 rc = context_write(p, &c->context[0], fp);
3421 if (rc)
3422 return rc;
3423 break;
3424 }
3425 }
3426 }
3427 return 0;
3428}
3429
3430static int genfs_write(struct policydb *p, void *fp)
3431{
3432 struct genfs *genfs;
3433 struct ocontext *c;
3434 size_t len;
3435 __le32 buf[1];
3436 int rc;
3437
3438 len = 0;
3439 for (genfs = p->genfs; genfs; genfs = genfs->next)
3440 len++;
3441 buf[0] = cpu_to_le32(len);
3442 rc = put_entry(buf, sizeof(u32), 1, fp);
3443 if (rc)
3444 return rc;
3445 for (genfs = p->genfs; genfs; genfs = genfs->next) {
3446 len = strlen(genfs->fstype);
3447 buf[0] = cpu_to_le32(len);
3448 rc = put_entry(buf, sizeof(u32), 1, fp);
3449 if (rc)
3450 return rc;
3451 rc = put_entry(genfs->fstype, 1, len, fp);
3452 if (rc)
3453 return rc;
3454 len = 0;
3455 for (c = genfs->head; c; c = c->next)
3456 len++;
3457 buf[0] = cpu_to_le32(len);
3458 rc = put_entry(buf, sizeof(u32), 1, fp);
3459 if (rc)
3460 return rc;
3461 for (c = genfs->head; c; c = c->next) {
3462 len = strlen(c->u.name);
3463 buf[0] = cpu_to_le32(len);
3464 rc = put_entry(buf, sizeof(u32), 1, fp);
3465 if (rc)
3466 return rc;
3467 rc = put_entry(c->u.name, 1, len, fp);
3468 if (rc)
3469 return rc;
3470 buf[0] = cpu_to_le32(c->v.sclass);
3471 rc = put_entry(buf, sizeof(u32), 1, fp);
3472 if (rc)
3473 return rc;
3474 rc = context_write(p, &c->context[0], fp);
3475 if (rc)
3476 return rc;
3477 }
3478 }
3479 return 0;
3480}
3481
3482static int range_write_helper(void *key, void *data, void *ptr)
3483{
3484 __le32 buf[2];
3485 struct range_trans *rt = key;
3486 struct mls_range *r = data;
3487 struct policy_data *pd = ptr;
3488 void *fp = pd->fp;
3489 struct policydb *p = pd->p;
3490 int rc;
3491
3492 buf[0] = cpu_to_le32(rt->source_type);
3493 buf[1] = cpu_to_le32(rt->target_type);
3494 rc = put_entry(buf, sizeof(u32), 2, fp);
3495 if (rc)
3496 return rc;
3497 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
3498 buf[0] = cpu_to_le32(rt->target_class);
3499 rc = put_entry(buf, sizeof(u32), 1, fp);
3500 if (rc)
3501 return rc;
3502 }
3503 rc = mls_write_range_helper(r, fp);
3504 if (rc)
3505 return rc;
3506
3507 return 0;
3508}
3509
3510static int range_write(struct policydb *p, void *fp)
3511{
3512 __le32 buf[1];
3513 int rc;
3514 struct policy_data pd;
3515
3516 pd.p = p;
3517 pd.fp = fp;
3518
3519 buf[0] = cpu_to_le32(p->range_tr.nel);
3520 rc = put_entry(buf, sizeof(u32), 1, fp);
3521 if (rc)
3522 return rc;
3523
3524 /* actually write all of the entries */
3525 rc = hashtab_map(&p->range_tr, range_write_helper, &pd);
3526 if (rc)
3527 return rc;
3528
3529 return 0;
3530}
3531
3532static int filename_write_helper_compat(void *key, void *data, void *ptr)
3533{
3534 struct filename_trans_key *ft = key;
3535 struct filename_trans_datum *datum = data;
3536 struct ebitmap_node *node;
3537 void *fp = ptr;
3538 __le32 buf[4];
3539 int rc;
3540 u32 bit, len = strlen(ft->name);
3541
3542 do {
3543 ebitmap_for_each_positive_bit(&datum->stypes, node, bit)
3544 {
3545 buf[0] = cpu_to_le32(len);
3546 rc = put_entry(buf, sizeof(u32), 1, fp);
3547 if (rc)
3548 return rc;
3549
3550 rc = put_entry(ft->name, sizeof(char), len, fp);
3551 if (rc)
3552 return rc;
3553
3554 buf[0] = cpu_to_le32(bit + 1);
3555 buf[1] = cpu_to_le32(ft->ttype);
3556 buf[2] = cpu_to_le32(ft->tclass);
3557 buf[3] = cpu_to_le32(datum->otype);
3558
3559 rc = put_entry(buf, sizeof(u32), 4, fp);
3560 if (rc)
3561 return rc;
3562 }
3563
3564 datum = datum->next;
3565 } while (unlikely(datum));
3566
3567 return 0;
3568}
3569
3570static int filename_write_helper(void *key, void *data, void *ptr)
3571{
3572 struct filename_trans_key *ft = key;
3573 struct filename_trans_datum *datum;
3574 void *fp = ptr;
3575 __le32 buf[3];
3576 int rc;
3577 u32 ndatum, len = strlen(ft->name);
3578
3579 buf[0] = cpu_to_le32(len);
3580 rc = put_entry(buf, sizeof(u32), 1, fp);
3581 if (rc)
3582 return rc;
3583
3584 rc = put_entry(ft->name, sizeof(char), len, fp);
3585 if (rc)
3586 return rc;
3587
3588 ndatum = 0;
3589 datum = data;
3590 do {
3591 ndatum++;
3592 datum = datum->next;
3593 } while (unlikely(datum));
3594
3595 buf[0] = cpu_to_le32(ft->ttype);
3596 buf[1] = cpu_to_le32(ft->tclass);
3597 buf[2] = cpu_to_le32(ndatum);
3598 rc = put_entry(buf, sizeof(u32), 3, fp);
3599 if (rc)
3600 return rc;
3601
3602 datum = data;
3603 do {
3604 rc = ebitmap_write(&datum->stypes, fp);
3605 if (rc)
3606 return rc;
3607
3608 buf[0] = cpu_to_le32(datum->otype);
3609 rc = put_entry(buf, sizeof(u32), 1, fp);
3610 if (rc)
3611 return rc;
3612
3613 datum = datum->next;
3614 } while (unlikely(datum));
3615
3616 return 0;
3617}
3618
3619static int filename_trans_write(struct policydb *p, void *fp)
3620{
3621 __le32 buf[1];
3622 int rc;
3623
3624 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
3625 return 0;
3626
3627 if (p->policyvers < POLICYDB_VERSION_COMP_FTRANS) {
3628 buf[0] = cpu_to_le32(p->compat_filename_trans_count);
3629 rc = put_entry(buf, sizeof(u32), 1, fp);
3630 if (rc)
3631 return rc;
3632
3633 rc = hashtab_map(&p->filename_trans,
3634 filename_write_helper_compat, fp);
3635 } else {
3636 buf[0] = cpu_to_le32(p->filename_trans.nel);
3637 rc = put_entry(buf, sizeof(u32), 1, fp);
3638 if (rc)
3639 return rc;
3640
3641 rc = hashtab_map(&p->filename_trans, filename_write_helper, fp);
3642 }
3643 return rc;
3644}
3645
3646/*
3647 * Write the configuration data in a policy database
3648 * structure to a policy database binary representation
3649 * file.
3650 */
3651int policydb_write(struct policydb *p, void *fp)
3652{
3653 unsigned int num_syms;
3654 int rc;
3655 __le32 buf[4];
3656 u32 config, i;
3657 size_t len;
3658 const struct policydb_compat_info *info;
3659
3660 /*
3661 * refuse to write policy older than compressed avtab
3662 * to simplify the writer. There are other tests dropped
3663 * since we assume this throughout the writer code. Be
3664 * careful if you ever try to remove this restriction
3665 */
3666 if (p->policyvers < POLICYDB_VERSION_AVTAB) {
3667 pr_err("SELinux: refusing to write policy version %d."
3668 " Because it is less than version %d\n",
3669 p->policyvers, POLICYDB_VERSION_AVTAB);
3670 return -EINVAL;
3671 }
3672
3673 config = 0;
3674 if (p->mls_enabled)
3675 config |= POLICYDB_CONFIG_MLS;
3676
3677 if (p->reject_unknown)
3678 config |= REJECT_UNKNOWN;
3679 if (p->allow_unknown)
3680 config |= ALLOW_UNKNOWN;
3681
3682 /* Write the magic number and string identifiers. */
3683 buf[0] = cpu_to_le32(POLICYDB_MAGIC);
3684 len = strlen(POLICYDB_STRING);
3685 buf[1] = cpu_to_le32(len);
3686 rc = put_entry(buf, sizeof(u32), 2, fp);
3687 if (rc)
3688 return rc;
3689 rc = put_entry(POLICYDB_STRING, 1, len, fp);
3690 if (rc)
3691 return rc;
3692
3693 /* Write the version, config, and table sizes. */
3694 info = policydb_lookup_compat(p->policyvers);
3695 if (!info) {
3696 pr_err("SELinux: compatibility lookup failed for policy "
3697 "version %d\n",
3698 p->policyvers);
3699 return -EINVAL;
3700 }
3701
3702 buf[0] = cpu_to_le32(p->policyvers);
3703 buf[1] = cpu_to_le32(config);
3704 buf[2] = cpu_to_le32(info->sym_num);
3705 buf[3] = cpu_to_le32(info->ocon_num);
3706
3707 rc = put_entry(buf, sizeof(u32), 4, fp);
3708 if (rc)
3709 return rc;
3710
3711 if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
3712 rc = ebitmap_write(&p->policycaps, fp);
3713 if (rc)
3714 return rc;
3715 }
3716
3717 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
3718 rc = ebitmap_write(&p->permissive_map, fp);
3719 if (rc)
3720 return rc;
3721 }
3722
3723 num_syms = info->sym_num;
3724 for (i = 0; i < num_syms; i++) {
3725 struct policy_data pd;
3726
3727 pd.fp = fp;
3728 pd.p = p;
3729
3730 buf[0] = cpu_to_le32(p->symtab[i].nprim);
3731 buf[1] = cpu_to_le32(p->symtab[i].table.nel);
3732
3733 rc = put_entry(buf, sizeof(u32), 2, fp);
3734 if (rc)
3735 return rc;
3736 rc = hashtab_map(&p->symtab[i].table, write_f[i], &pd);
3737 if (rc)
3738 return rc;
3739 }
3740
3741 rc = avtab_write(p, &p->te_avtab, fp);
3742 if (rc)
3743 return rc;
3744
3745 rc = cond_write_list(p, fp);
3746 if (rc)
3747 return rc;
3748
3749 rc = role_trans_write(p, fp);
3750 if (rc)
3751 return rc;
3752
3753 rc = role_allow_write(p->role_allow, fp);
3754 if (rc)
3755 return rc;
3756
3757 rc = filename_trans_write(p, fp);
3758 if (rc)
3759 return rc;
3760
3761 rc = ocontext_write(p, info, fp);
3762 if (rc)
3763 return rc;
3764
3765 rc = genfs_write(p, fp);
3766 if (rc)
3767 return rc;
3768
3769 rc = range_write(p, fp);
3770 if (rc)
3771 return rc;
3772
3773 for (i = 0; i < p->p_types.nprim; i++) {
3774 struct ebitmap *e = &p->type_attr_map_array[i];
3775
3776 rc = ebitmap_write(e, fp);
3777 if (rc)
3778 return rc;
3779 }
3780
3781 return 0;
3782}