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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 const char *hash_details)
677{
678 struct hashtab_info info;
679
680 hashtab_stat(h, &info);
681 pr_debug(
682 "SELinux: %s%s%s: %d entries and %d/%d buckets used, longest chain length %d, sum of chain length^2 %llu\n",
683 hash_name, hash_details ? "@" : "", hash_details ?: "", h->nel,
684 info.slots_used, h->size, info.max_chain_len,
685 info.chain2_len_sum);
686}
687
688static void symtab_hash_eval(struct symtab *s)
689{
690 int i;
691
692 for (i = 0; i < SYM_NUM; i++)
693 hash_eval(&s[i].table, symtab_name[i], NULL);
694}
695
696#else
697static inline void hash_eval(struct hashtab *h, const char *hash_name,
698 const char *hash_details)
699{
700}
701static inline void symtab_hash_eval(struct symtab *s)
702{
703}
704#endif /* CONFIG_SECURITY_SELINUX_DEBUG */
705
706/*
707 * Define the other val_to_name and val_to_struct arrays
708 * in a policy database structure.
709 *
710 * Caller must clean up on failure.
711 */
712static int policydb_index(struct policydb *p)
713{
714 int i, rc;
715
716 if (p->mls_enabled)
717 pr_debug(
718 "SELinux: %d users, %d roles, %d types, %d bools, %d sens, %d cats\n",
719 p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim,
720 p->p_bools.nprim, p->p_levels.nprim, p->p_cats.nprim);
721 else
722 pr_debug("SELinux: %d users, %d roles, %d types, %d bools\n",
723 p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim,
724 p->p_bools.nprim);
725
726 pr_debug("SELinux: %d classes, %d rules\n", p->p_classes.nprim,
727 p->te_avtab.nel);
728
729 avtab_hash_eval(&p->te_avtab, "rules");
730 symtab_hash_eval(p->symtab);
731
732 p->class_val_to_struct = kcalloc(p->p_classes.nprim,
733 sizeof(*p->class_val_to_struct),
734 GFP_KERNEL);
735 if (!p->class_val_to_struct)
736 return -ENOMEM;
737
738 p->role_val_to_struct = kcalloc(
739 p->p_roles.nprim, sizeof(*p->role_val_to_struct), GFP_KERNEL);
740 if (!p->role_val_to_struct)
741 return -ENOMEM;
742
743 p->user_val_to_struct = kcalloc(
744 p->p_users.nprim, sizeof(*p->user_val_to_struct), GFP_KERNEL);
745 if (!p->user_val_to_struct)
746 return -ENOMEM;
747
748 p->type_val_to_struct = kvcalloc(
749 p->p_types.nprim, sizeof(*p->type_val_to_struct), GFP_KERNEL);
750 if (!p->type_val_to_struct)
751 return -ENOMEM;
752
753 rc = cond_init_bool_indexes(p);
754 if (rc)
755 goto out;
756
757 for (i = 0; i < SYM_NUM; i++) {
758 p->sym_val_to_name[i] = kvcalloc(p->symtab[i].nprim,
759 sizeof(char *), GFP_KERNEL);
760 if (!p->sym_val_to_name[i])
761 return -ENOMEM;
762
763 rc = hashtab_map(&p->symtab[i].table, index_f[i], p);
764 if (rc)
765 goto out;
766 }
767 rc = 0;
768out:
769 return rc;
770}
771
772/*
773 * Free any memory allocated by a policy database structure.
774 */
775void policydb_destroy(struct policydb *p)
776{
777 struct ocontext *c, *ctmp;
778 struct genfs *g, *gtmp;
779 u32 i;
780 struct role_allow *ra, *lra = NULL;
781
782 for (i = 0; i < SYM_NUM; i++) {
783 cond_resched();
784 hashtab_map(&p->symtab[i].table, destroy_f[i], NULL);
785 hashtab_destroy(&p->symtab[i].table);
786 }
787
788 for (i = 0; i < SYM_NUM; i++)
789 kvfree(p->sym_val_to_name[i]);
790
791 kfree(p->class_val_to_struct);
792 kfree(p->role_val_to_struct);
793 kfree(p->user_val_to_struct);
794 kvfree(p->type_val_to_struct);
795
796 avtab_destroy(&p->te_avtab);
797
798 for (i = 0; i < OCON_NUM; i++) {
799 cond_resched();
800 c = p->ocontexts[i];
801 while (c) {
802 ctmp = c;
803 c = c->next;
804 ocontext_destroy(ctmp, i);
805 }
806 p->ocontexts[i] = NULL;
807 }
808
809 g = p->genfs;
810 while (g) {
811 cond_resched();
812 kfree(g->fstype);
813 c = g->head;
814 while (c) {
815 ctmp = c;
816 c = c->next;
817 ocontext_destroy(ctmp, OCON_FSUSE);
818 }
819 gtmp = g;
820 g = g->next;
821 kfree(gtmp);
822 }
823 p->genfs = NULL;
824
825 cond_policydb_destroy(p);
826
827 hashtab_map(&p->role_tr, role_tr_destroy, NULL);
828 hashtab_destroy(&p->role_tr);
829
830 for (ra = p->role_allow; ra; ra = ra->next) {
831 cond_resched();
832 kfree(lra);
833 lra = ra;
834 }
835 kfree(lra);
836
837 hashtab_map(&p->filename_trans, filenametr_destroy, NULL);
838 hashtab_destroy(&p->filename_trans);
839
840 hashtab_map(&p->range_tr, range_tr_destroy, NULL);
841 hashtab_destroy(&p->range_tr);
842
843 if (p->type_attr_map_array) {
844 for (i = 0; i < p->p_types.nprim; i++)
845 ebitmap_destroy(&p->type_attr_map_array[i]);
846 kvfree(p->type_attr_map_array);
847 }
848
849 ebitmap_destroy(&p->filename_trans_ttypes);
850 ebitmap_destroy(&p->policycaps);
851 ebitmap_destroy(&p->permissive_map);
852}
853
854/*
855 * Load the initial SIDs specified in a policy database
856 * structure into a SID table.
857 */
858int policydb_load_isids(struct policydb *p, struct sidtab *s)
859{
860 struct ocontext *head, *c;
861 bool isid_init;
862 int rc;
863
864 rc = sidtab_init(s);
865 if (rc) {
866 pr_err("SELinux: out of memory on SID table init\n");
867 return rc;
868 }
869
870 isid_init = ebitmap_get_bit(&p->policycaps,
871 POLICYDB_CAP_USERSPACE_INITIAL_CONTEXT);
872
873 head = p->ocontexts[OCON_ISID];
874 for (c = head; c; c = c->next) {
875 u32 sid = c->sid[0];
876 const char *name = security_get_initial_sid_context(sid);
877
878 if (sid == SECSID_NULL) {
879 pr_err("SELinux: SID 0 was assigned a context.\n");
880 sidtab_destroy(s);
881 return -EINVAL;
882 }
883
884 /* Ignore initial SIDs unused by this kernel. */
885 if (!name)
886 continue;
887
888 /*
889 * Also ignore SECINITSID_INIT if the policy doesn't declare
890 * support for it
891 */
892 if (sid == SECINITSID_INIT && !isid_init)
893 continue;
894
895 rc = sidtab_set_initial(s, sid, &c->context[0]);
896 if (rc) {
897 pr_err("SELinux: unable to load initial SID %s.\n",
898 name);
899 sidtab_destroy(s);
900 return rc;
901 }
902
903 /*
904 * If the policy doesn't support the "userspace_initial_context"
905 * capability, set SECINITSID_INIT to the same context as
906 * SECINITSID_KERNEL. This ensures the same behavior as before
907 * the reintroduction of SECINITSID_INIT, where all tasks
908 * started before policy load would initially get the context
909 * corresponding to SECINITSID_KERNEL.
910 */
911 if (sid == SECINITSID_KERNEL && !isid_init) {
912 rc = sidtab_set_initial(s, SECINITSID_INIT,
913 &c->context[0]);
914 if (rc) {
915 pr_err("SELinux: unable to load initial SID %s.\n",
916 name);
917 sidtab_destroy(s);
918 return rc;
919 }
920 }
921 }
922 return 0;
923}
924
925int policydb_class_isvalid(struct policydb *p, unsigned int class)
926{
927 if (!class || class > p->p_classes.nprim)
928 return 0;
929 return 1;
930}
931
932int policydb_role_isvalid(struct policydb *p, unsigned int role)
933{
934 if (!role || role > p->p_roles.nprim)
935 return 0;
936 return 1;
937}
938
939int policydb_type_isvalid(struct policydb *p, unsigned int type)
940{
941 if (!type || type > p->p_types.nprim)
942 return 0;
943 return 1;
944}
945
946/*
947 * Return 1 if the fields in the security context
948 * structure `c' are valid. Return 0 otherwise.
949 */
950int policydb_context_isvalid(struct policydb *p, struct context *c)
951{
952 struct role_datum *role;
953 struct user_datum *usrdatum;
954
955 if (!c->role || c->role > p->p_roles.nprim)
956 return 0;
957
958 if (!c->user || c->user > p->p_users.nprim)
959 return 0;
960
961 if (!c->type || c->type > p->p_types.nprim)
962 return 0;
963
964 if (c->role != OBJECT_R_VAL) {
965 /*
966 * Role must be authorized for the type.
967 */
968 role = p->role_val_to_struct[c->role - 1];
969 if (!role || !ebitmap_get_bit(&role->types, c->type - 1))
970 /* role may not be associated with type */
971 return 0;
972
973 /*
974 * User must be authorized for the role.
975 */
976 usrdatum = p->user_val_to_struct[c->user - 1];
977 if (!usrdatum)
978 return 0;
979
980 if (!ebitmap_get_bit(&usrdatum->roles, c->role - 1))
981 /* user may not be associated with role */
982 return 0;
983 }
984
985 if (!mls_context_isvalid(p, c))
986 return 0;
987
988 return 1;
989}
990
991/*
992 * Read a MLS range structure from a policydb binary
993 * representation file.
994 */
995static int mls_read_range_helper(struct mls_range *r, void *fp)
996{
997 __le32 buf[2];
998 u32 items;
999 int rc;
1000
1001 rc = next_entry(buf, fp, sizeof(u32));
1002 if (rc)
1003 goto out;
1004
1005 rc = -EINVAL;
1006 items = le32_to_cpu(buf[0]);
1007 if (items > ARRAY_SIZE(buf)) {
1008 pr_err("SELinux: mls: range overflow\n");
1009 goto out;
1010 }
1011
1012 rc = next_entry(buf, fp, sizeof(u32) * items);
1013 if (rc) {
1014 pr_err("SELinux: mls: truncated range\n");
1015 goto out;
1016 }
1017
1018 r->level[0].sens = le32_to_cpu(buf[0]);
1019 if (items > 1)
1020 r->level[1].sens = le32_to_cpu(buf[1]);
1021 else
1022 r->level[1].sens = r->level[0].sens;
1023
1024 rc = ebitmap_read(&r->level[0].cat, fp);
1025 if (rc) {
1026 pr_err("SELinux: mls: error reading low categories\n");
1027 goto out;
1028 }
1029 if (items > 1) {
1030 rc = ebitmap_read(&r->level[1].cat, fp);
1031 if (rc) {
1032 pr_err("SELinux: mls: error reading high categories\n");
1033 goto bad_high;
1034 }
1035 } else {
1036 rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat);
1037 if (rc) {
1038 pr_err("SELinux: mls: out of memory\n");
1039 goto bad_high;
1040 }
1041 }
1042
1043 return 0;
1044bad_high:
1045 ebitmap_destroy(&r->level[0].cat);
1046out:
1047 return rc;
1048}
1049
1050/*
1051 * Read and validate a security context structure
1052 * from a policydb binary representation file.
1053 */
1054static int context_read_and_validate(struct context *c, struct policydb *p,
1055 void *fp)
1056{
1057 __le32 buf[3];
1058 int rc;
1059
1060 rc = next_entry(buf, fp, sizeof buf);
1061 if (rc) {
1062 pr_err("SELinux: context truncated\n");
1063 goto out;
1064 }
1065 c->user = le32_to_cpu(buf[0]);
1066 c->role = le32_to_cpu(buf[1]);
1067 c->type = le32_to_cpu(buf[2]);
1068 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1069 rc = mls_read_range_helper(&c->range, fp);
1070 if (rc) {
1071 pr_err("SELinux: error reading MLS range of context\n");
1072 goto out;
1073 }
1074 }
1075
1076 rc = -EINVAL;
1077 if (!policydb_context_isvalid(p, c)) {
1078 pr_err("SELinux: invalid security context\n");
1079 context_destroy(c);
1080 goto out;
1081 }
1082 rc = 0;
1083out:
1084 return rc;
1085}
1086
1087/*
1088 * The following *_read functions are used to
1089 * read the symbol data from a policy database
1090 * binary representation file.
1091 */
1092
1093static int str_read(char **strp, gfp_t flags, void *fp, u32 len)
1094{
1095 int rc;
1096 char *str;
1097
1098 if ((len == 0) || (len == (u32)-1))
1099 return -EINVAL;
1100
1101 str = kmalloc(len + 1, flags | __GFP_NOWARN);
1102 if (!str)
1103 return -ENOMEM;
1104
1105 rc = next_entry(str, fp, len);
1106 if (rc) {
1107 kfree(str);
1108 return rc;
1109 }
1110
1111 str[len] = '\0';
1112 *strp = str;
1113 return 0;
1114}
1115
1116static int perm_read(struct policydb *p, struct symtab *s, void *fp)
1117{
1118 char *key = NULL;
1119 struct perm_datum *perdatum;
1120 int rc;
1121 __le32 buf[2];
1122 u32 len;
1123
1124 perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
1125 if (!perdatum)
1126 return -ENOMEM;
1127
1128 rc = next_entry(buf, fp, sizeof buf);
1129 if (rc)
1130 goto bad;
1131
1132 len = le32_to_cpu(buf[0]);
1133 perdatum->value = le32_to_cpu(buf[1]);
1134
1135 rc = str_read(&key, GFP_KERNEL, fp, len);
1136 if (rc)
1137 goto bad;
1138
1139 rc = symtab_insert(s, key, perdatum);
1140 if (rc)
1141 goto bad;
1142
1143 return 0;
1144bad:
1145 perm_destroy(key, perdatum, NULL);
1146 return rc;
1147}
1148
1149static int common_read(struct policydb *p, struct symtab *s, void *fp)
1150{
1151 char *key = NULL;
1152 struct common_datum *comdatum;
1153 __le32 buf[4];
1154 u32 i, len, nel;
1155 int rc;
1156
1157 comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
1158 if (!comdatum)
1159 return -ENOMEM;
1160
1161 rc = next_entry(buf, fp, sizeof buf);
1162 if (rc)
1163 goto bad;
1164
1165 len = le32_to_cpu(buf[0]);
1166 comdatum->value = le32_to_cpu(buf[1]);
1167 nel = le32_to_cpu(buf[3]);
1168
1169 rc = symtab_init(&comdatum->permissions, nel);
1170 if (rc)
1171 goto bad;
1172 comdatum->permissions.nprim = le32_to_cpu(buf[2]);
1173
1174 rc = str_read(&key, GFP_KERNEL, fp, len);
1175 if (rc)
1176 goto bad;
1177
1178 for (i = 0; i < nel; i++) {
1179 rc = perm_read(p, &comdatum->permissions, fp);
1180 if (rc)
1181 goto bad;
1182 }
1183
1184 hash_eval(&comdatum->permissions.table, "common_permissions", key);
1185
1186 rc = symtab_insert(s, key, comdatum);
1187 if (rc)
1188 goto bad;
1189 return 0;
1190bad:
1191 common_destroy(key, comdatum, NULL);
1192 return rc;
1193}
1194
1195static void type_set_init(struct type_set *t)
1196{
1197 ebitmap_init(&t->types);
1198 ebitmap_init(&t->negset);
1199}
1200
1201static int type_set_read(struct type_set *t, void *fp)
1202{
1203 __le32 buf[1];
1204 int rc;
1205
1206 if (ebitmap_read(&t->types, fp))
1207 return -EINVAL;
1208 if (ebitmap_read(&t->negset, fp))
1209 return -EINVAL;
1210
1211 rc = next_entry(buf, fp, sizeof(u32));
1212 if (rc < 0)
1213 return -EINVAL;
1214 t->flags = le32_to_cpu(buf[0]);
1215
1216 return 0;
1217}
1218
1219static int read_cons_helper(struct policydb *p, struct constraint_node **nodep,
1220 u32 ncons, int allowxtarget, void *fp)
1221{
1222 struct constraint_node *c, *lc;
1223 struct constraint_expr *e, *le;
1224 __le32 buf[3];
1225 u32 i, j, nexpr;
1226 int rc, depth;
1227
1228 lc = NULL;
1229 for (i = 0; i < ncons; i++) {
1230 c = kzalloc(sizeof(*c), GFP_KERNEL);
1231 if (!c)
1232 return -ENOMEM;
1233
1234 if (lc)
1235 lc->next = c;
1236 else
1237 *nodep = c;
1238
1239 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1240 if (rc)
1241 return rc;
1242 c->permissions = le32_to_cpu(buf[0]);
1243 nexpr = le32_to_cpu(buf[1]);
1244 le = NULL;
1245 depth = -1;
1246 for (j = 0; j < nexpr; j++) {
1247 e = kzalloc(sizeof(*e), GFP_KERNEL);
1248 if (!e)
1249 return -ENOMEM;
1250
1251 if (le)
1252 le->next = e;
1253 else
1254 c->expr = e;
1255
1256 rc = next_entry(buf, fp, (sizeof(u32) * 3));
1257 if (rc)
1258 return rc;
1259 e->expr_type = le32_to_cpu(buf[0]);
1260 e->attr = le32_to_cpu(buf[1]);
1261 e->op = le32_to_cpu(buf[2]);
1262
1263 switch (e->expr_type) {
1264 case CEXPR_NOT:
1265 if (depth < 0)
1266 return -EINVAL;
1267 break;
1268 case CEXPR_AND:
1269 case CEXPR_OR:
1270 if (depth < 1)
1271 return -EINVAL;
1272 depth--;
1273 break;
1274 case CEXPR_ATTR:
1275 if (depth == (CEXPR_MAXDEPTH - 1))
1276 return -EINVAL;
1277 depth++;
1278 break;
1279 case CEXPR_NAMES:
1280 if (!allowxtarget && (e->attr & CEXPR_XTARGET))
1281 return -EINVAL;
1282 if (depth == (CEXPR_MAXDEPTH - 1))
1283 return -EINVAL;
1284 depth++;
1285 rc = ebitmap_read(&e->names, fp);
1286 if (rc)
1287 return rc;
1288 if (p->policyvers >=
1289 POLICYDB_VERSION_CONSTRAINT_NAMES) {
1290 e->type_names =
1291 kzalloc(sizeof(*e->type_names),
1292 GFP_KERNEL);
1293 if (!e->type_names)
1294 return -ENOMEM;
1295 type_set_init(e->type_names);
1296 rc = type_set_read(e->type_names, fp);
1297 if (rc)
1298 return rc;
1299 }
1300 break;
1301 default:
1302 return -EINVAL;
1303 }
1304 le = e;
1305 }
1306 if (depth != 0)
1307 return -EINVAL;
1308 lc = c;
1309 }
1310
1311 return 0;
1312}
1313
1314static int class_read(struct policydb *p, struct symtab *s, void *fp)
1315{
1316 char *key = NULL;
1317 struct class_datum *cladatum;
1318 __le32 buf[6];
1319 u32 i, len, len2, ncons, nel;
1320 int rc;
1321
1322 cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
1323 if (!cladatum)
1324 return -ENOMEM;
1325
1326 rc = next_entry(buf, fp, sizeof(u32) * 6);
1327 if (rc)
1328 goto bad;
1329
1330 len = le32_to_cpu(buf[0]);
1331 len2 = le32_to_cpu(buf[1]);
1332 cladatum->value = le32_to_cpu(buf[2]);
1333 nel = le32_to_cpu(buf[4]);
1334
1335 rc = symtab_init(&cladatum->permissions, nel);
1336 if (rc)
1337 goto bad;
1338 cladatum->permissions.nprim = le32_to_cpu(buf[3]);
1339
1340 ncons = le32_to_cpu(buf[5]);
1341
1342 rc = str_read(&key, GFP_KERNEL, fp, len);
1343 if (rc)
1344 goto bad;
1345
1346 if (len2) {
1347 rc = str_read(&cladatum->comkey, GFP_KERNEL, fp, len2);
1348 if (rc)
1349 goto bad;
1350
1351 rc = -EINVAL;
1352 cladatum->comdatum =
1353 symtab_search(&p->p_commons, cladatum->comkey);
1354 if (!cladatum->comdatum) {
1355 pr_err("SELinux: unknown common %s\n",
1356 cladatum->comkey);
1357 goto bad;
1358 }
1359 }
1360 for (i = 0; i < nel; i++) {
1361 rc = perm_read(p, &cladatum->permissions, fp);
1362 if (rc)
1363 goto bad;
1364 }
1365
1366 hash_eval(&cladatum->permissions.table, "class_permissions", key);
1367
1368 rc = read_cons_helper(p, &cladatum->constraints, ncons, 0, fp);
1369 if (rc)
1370 goto bad;
1371
1372 if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
1373 /* grab the validatetrans rules */
1374 rc = next_entry(buf, fp, sizeof(u32));
1375 if (rc)
1376 goto bad;
1377 ncons = le32_to_cpu(buf[0]);
1378 rc = read_cons_helper(p, &cladatum->validatetrans, ncons, 1,
1379 fp);
1380 if (rc)
1381 goto bad;
1382 }
1383
1384 if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
1385 rc = next_entry(buf, fp, sizeof(u32) * 3);
1386 if (rc)
1387 goto bad;
1388
1389 cladatum->default_user = le32_to_cpu(buf[0]);
1390 cladatum->default_role = le32_to_cpu(buf[1]);
1391 cladatum->default_range = le32_to_cpu(buf[2]);
1392 }
1393
1394 if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
1395 rc = next_entry(buf, fp, sizeof(u32) * 1);
1396 if (rc)
1397 goto bad;
1398 cladatum->default_type = le32_to_cpu(buf[0]);
1399 }
1400
1401 rc = symtab_insert(s, key, cladatum);
1402 if (rc)
1403 goto bad;
1404
1405 return 0;
1406bad:
1407 cls_destroy(key, cladatum, NULL);
1408 return rc;
1409}
1410
1411static int role_read(struct policydb *p, struct symtab *s, void *fp)
1412{
1413 char *key = NULL;
1414 struct role_datum *role;
1415 int rc;
1416 unsigned int to_read = 2;
1417 __le32 buf[3];
1418 u32 len;
1419
1420 role = kzalloc(sizeof(*role), GFP_KERNEL);
1421 if (!role)
1422 return -ENOMEM;
1423
1424 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1425 to_read = 3;
1426
1427 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1428 if (rc)
1429 goto bad;
1430
1431 len = le32_to_cpu(buf[0]);
1432 role->value = le32_to_cpu(buf[1]);
1433 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1434 role->bounds = le32_to_cpu(buf[2]);
1435
1436 rc = str_read(&key, GFP_KERNEL, fp, len);
1437 if (rc)
1438 goto bad;
1439
1440 rc = ebitmap_read(&role->dominates, fp);
1441 if (rc)
1442 goto bad;
1443
1444 rc = ebitmap_read(&role->types, fp);
1445 if (rc)
1446 goto bad;
1447
1448 if (strcmp(key, OBJECT_R) == 0) {
1449 rc = -EINVAL;
1450 if (role->value != OBJECT_R_VAL) {
1451 pr_err("SELinux: Role %s has wrong value %d\n",
1452 OBJECT_R, role->value);
1453 goto bad;
1454 }
1455 rc = 0;
1456 goto bad;
1457 }
1458
1459 rc = symtab_insert(s, key, role);
1460 if (rc)
1461 goto bad;
1462 return 0;
1463bad:
1464 role_destroy(key, role, NULL);
1465 return rc;
1466}
1467
1468static int type_read(struct policydb *p, struct symtab *s, void *fp)
1469{
1470 char *key = NULL;
1471 struct type_datum *typdatum;
1472 int rc;
1473 unsigned int to_read = 3;
1474 __le32 buf[4];
1475 u32 len;
1476
1477 typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL);
1478 if (!typdatum)
1479 return -ENOMEM;
1480
1481 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1482 to_read = 4;
1483
1484 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1485 if (rc)
1486 goto bad;
1487
1488 len = le32_to_cpu(buf[0]);
1489 typdatum->value = le32_to_cpu(buf[1]);
1490 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
1491 u32 prop = le32_to_cpu(buf[2]);
1492
1493 if (prop & TYPEDATUM_PROPERTY_PRIMARY)
1494 typdatum->primary = 1;
1495 if (prop & TYPEDATUM_PROPERTY_ATTRIBUTE)
1496 typdatum->attribute = 1;
1497
1498 typdatum->bounds = le32_to_cpu(buf[3]);
1499 } else {
1500 typdatum->primary = le32_to_cpu(buf[2]);
1501 }
1502
1503 rc = str_read(&key, GFP_KERNEL, fp, len);
1504 if (rc)
1505 goto bad;
1506
1507 rc = symtab_insert(s, key, typdatum);
1508 if (rc)
1509 goto bad;
1510 return 0;
1511bad:
1512 type_destroy(key, typdatum, NULL);
1513 return rc;
1514}
1515
1516/*
1517 * Read a MLS level structure from a policydb binary
1518 * representation file.
1519 */
1520static int mls_read_level(struct mls_level *lp, void *fp)
1521{
1522 __le32 buf[1];
1523 int rc;
1524
1525 memset(lp, 0, sizeof(*lp));
1526
1527 rc = next_entry(buf, fp, sizeof buf);
1528 if (rc) {
1529 pr_err("SELinux: mls: truncated level\n");
1530 return rc;
1531 }
1532 lp->sens = le32_to_cpu(buf[0]);
1533
1534 rc = ebitmap_read(&lp->cat, fp);
1535 if (rc) {
1536 pr_err("SELinux: mls: error reading level categories\n");
1537 return rc;
1538 }
1539 return 0;
1540}
1541
1542static int user_read(struct policydb *p, struct symtab *s, void *fp)
1543{
1544 char *key = NULL;
1545 struct user_datum *usrdatum;
1546 int rc;
1547 unsigned int to_read = 2;
1548 __le32 buf[3];
1549 u32 len;
1550
1551 usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
1552 if (!usrdatum)
1553 return -ENOMEM;
1554
1555 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1556 to_read = 3;
1557
1558 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1559 if (rc)
1560 goto bad;
1561
1562 len = le32_to_cpu(buf[0]);
1563 usrdatum->value = le32_to_cpu(buf[1]);
1564 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1565 usrdatum->bounds = le32_to_cpu(buf[2]);
1566
1567 rc = str_read(&key, GFP_KERNEL, fp, len);
1568 if (rc)
1569 goto bad;
1570
1571 rc = ebitmap_read(&usrdatum->roles, fp);
1572 if (rc)
1573 goto bad;
1574
1575 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1576 rc = mls_read_range_helper(&usrdatum->range, fp);
1577 if (rc)
1578 goto bad;
1579 rc = mls_read_level(&usrdatum->dfltlevel, fp);
1580 if (rc)
1581 goto bad;
1582 }
1583
1584 rc = symtab_insert(s, key, usrdatum);
1585 if (rc)
1586 goto bad;
1587 return 0;
1588bad:
1589 user_destroy(key, usrdatum, NULL);
1590 return rc;
1591}
1592
1593static int sens_read(struct policydb *p, struct symtab *s, void *fp)
1594{
1595 char *key = NULL;
1596 struct level_datum *levdatum;
1597 int rc;
1598 __le32 buf[2];
1599 u32 len;
1600
1601 levdatum = kzalloc(sizeof(*levdatum), GFP_KERNEL);
1602 if (!levdatum)
1603 return -ENOMEM;
1604
1605 rc = next_entry(buf, fp, sizeof buf);
1606 if (rc)
1607 goto bad;
1608
1609 len = le32_to_cpu(buf[0]);
1610 levdatum->isalias = le32_to_cpu(buf[1]);
1611
1612 rc = str_read(&key, GFP_KERNEL, fp, len);
1613 if (rc)
1614 goto bad;
1615
1616 rc = -ENOMEM;
1617 levdatum->level = kmalloc(sizeof(*levdatum->level), GFP_KERNEL);
1618 if (!levdatum->level)
1619 goto bad;
1620
1621 rc = mls_read_level(levdatum->level, fp);
1622 if (rc)
1623 goto bad;
1624
1625 rc = symtab_insert(s, key, levdatum);
1626 if (rc)
1627 goto bad;
1628 return 0;
1629bad:
1630 sens_destroy(key, levdatum, NULL);
1631 return rc;
1632}
1633
1634static int cat_read(struct policydb *p, struct symtab *s, void *fp)
1635{
1636 char *key = NULL;
1637 struct cat_datum *catdatum;
1638 int rc;
1639 __le32 buf[3];
1640 u32 len;
1641
1642 catdatum = kzalloc(sizeof(*catdatum), GFP_KERNEL);
1643 if (!catdatum)
1644 return -ENOMEM;
1645
1646 rc = next_entry(buf, fp, sizeof buf);
1647 if (rc)
1648 goto bad;
1649
1650 len = le32_to_cpu(buf[0]);
1651 catdatum->value = le32_to_cpu(buf[1]);
1652 catdatum->isalias = le32_to_cpu(buf[2]);
1653
1654 rc = str_read(&key, GFP_KERNEL, fp, len);
1655 if (rc)
1656 goto bad;
1657
1658 rc = symtab_insert(s, key, catdatum);
1659 if (rc)
1660 goto bad;
1661 return 0;
1662bad:
1663 cat_destroy(key, catdatum, NULL);
1664 return rc;
1665}
1666
1667/* clang-format off */
1668static int (*const read_f[SYM_NUM])(struct policydb *p, struct symtab *s,
1669 void *fp) = {
1670 common_read,
1671 class_read,
1672 role_read,
1673 type_read,
1674 user_read,
1675 cond_read_bool,
1676 sens_read,
1677 cat_read,
1678};
1679/* clang-format on */
1680
1681static int user_bounds_sanity_check(void *key, void *datum, void *datap)
1682{
1683 struct user_datum *upper, *user;
1684 struct policydb *p = datap;
1685 int depth = 0;
1686
1687 upper = user = datum;
1688 while (upper->bounds) {
1689 struct ebitmap_node *node;
1690 u32 bit;
1691
1692 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1693 pr_err("SELinux: user %s: "
1694 "too deep or looped boundary\n",
1695 (char *)key);
1696 return -EINVAL;
1697 }
1698
1699 upper = p->user_val_to_struct[upper->bounds - 1];
1700 ebitmap_for_each_positive_bit(&user->roles, node, bit)
1701 {
1702 if (ebitmap_get_bit(&upper->roles, bit))
1703 continue;
1704
1705 pr_err("SELinux: boundary violated policy: "
1706 "user=%s role=%s bounds=%s\n",
1707 sym_name(p, SYM_USERS, user->value - 1),
1708 sym_name(p, SYM_ROLES, bit),
1709 sym_name(p, SYM_USERS, upper->value - 1));
1710
1711 return -EINVAL;
1712 }
1713 }
1714
1715 return 0;
1716}
1717
1718static int role_bounds_sanity_check(void *key, void *datum, void *datap)
1719{
1720 struct role_datum *upper, *role;
1721 struct policydb *p = datap;
1722 int depth = 0;
1723
1724 upper = role = datum;
1725 while (upper->bounds) {
1726 struct ebitmap_node *node;
1727 u32 bit;
1728
1729 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1730 pr_err("SELinux: role %s: "
1731 "too deep or looped bounds\n",
1732 (char *)key);
1733 return -EINVAL;
1734 }
1735
1736 upper = p->role_val_to_struct[upper->bounds - 1];
1737 ebitmap_for_each_positive_bit(&role->types, node, bit)
1738 {
1739 if (ebitmap_get_bit(&upper->types, bit))
1740 continue;
1741
1742 pr_err("SELinux: boundary violated policy: "
1743 "role=%s type=%s bounds=%s\n",
1744 sym_name(p, SYM_ROLES, role->value - 1),
1745 sym_name(p, SYM_TYPES, bit),
1746 sym_name(p, SYM_ROLES, upper->value - 1));
1747
1748 return -EINVAL;
1749 }
1750 }
1751
1752 return 0;
1753}
1754
1755static int type_bounds_sanity_check(void *key, void *datum, void *datap)
1756{
1757 struct type_datum *upper;
1758 struct policydb *p = datap;
1759 int depth = 0;
1760
1761 upper = datum;
1762 while (upper->bounds) {
1763 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1764 pr_err("SELinux: type %s: "
1765 "too deep or looped boundary\n",
1766 (char *)key);
1767 return -EINVAL;
1768 }
1769
1770 upper = p->type_val_to_struct[upper->bounds - 1];
1771 BUG_ON(!upper);
1772
1773 if (upper->attribute) {
1774 pr_err("SELinux: type %s: "
1775 "bounded by attribute %s\n",
1776 (char *)key,
1777 sym_name(p, SYM_TYPES, upper->value - 1));
1778 return -EINVAL;
1779 }
1780 }
1781
1782 return 0;
1783}
1784
1785static int policydb_bounds_sanity_check(struct policydb *p)
1786{
1787 int rc;
1788
1789 if (p->policyvers < POLICYDB_VERSION_BOUNDARY)
1790 return 0;
1791
1792 rc = hashtab_map(&p->p_users.table, user_bounds_sanity_check, p);
1793 if (rc)
1794 return rc;
1795
1796 rc = hashtab_map(&p->p_roles.table, role_bounds_sanity_check, p);
1797 if (rc)
1798 return rc;
1799
1800 rc = hashtab_map(&p->p_types.table, 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 = symtab_search(&p->p_classes, 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 = symtab_search(&comdatum->permissions, name);
1831 if (!perdatum)
1832 perdatum = symtab_search(&cladatum->permissions, name);
1833 if (!perdatum)
1834 return 0;
1835
1836 return 1U << (perdatum->value - 1);
1837}
1838
1839static int range_read(struct policydb *p, void *fp)
1840{
1841 struct range_trans *rt = NULL;
1842 struct mls_range *r = NULL;
1843 int rc;
1844 __le32 buf[2];
1845 u32 i, nel;
1846
1847 if (p->policyvers < POLICYDB_VERSION_MLS)
1848 return 0;
1849
1850 rc = next_entry(buf, fp, sizeof(u32));
1851 if (rc)
1852 return rc;
1853
1854 nel = le32_to_cpu(buf[0]);
1855
1856 rc = hashtab_init(&p->range_tr, nel);
1857 if (rc)
1858 return rc;
1859
1860 for (i = 0; i < nel; i++) {
1861 rc = -ENOMEM;
1862 rt = kzalloc(sizeof(*rt), GFP_KERNEL);
1863 if (!rt)
1864 goto out;
1865
1866 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1867 if (rc)
1868 goto out;
1869
1870 rt->source_type = le32_to_cpu(buf[0]);
1871 rt->target_type = le32_to_cpu(buf[1]);
1872 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
1873 rc = next_entry(buf, fp, sizeof(u32));
1874 if (rc)
1875 goto out;
1876 rt->target_class = le32_to_cpu(buf[0]);
1877 } else
1878 rt->target_class = p->process_class;
1879
1880 rc = -EINVAL;
1881 if (!policydb_type_isvalid(p, rt->source_type) ||
1882 !policydb_type_isvalid(p, rt->target_type) ||
1883 !policydb_class_isvalid(p, rt->target_class))
1884 goto out;
1885
1886 rc = -ENOMEM;
1887 r = kzalloc(sizeof(*r), GFP_KERNEL);
1888 if (!r)
1889 goto out;
1890
1891 rc = mls_read_range_helper(r, fp);
1892 if (rc)
1893 goto out;
1894
1895 rc = -EINVAL;
1896 if (!mls_range_isvalid(p, r)) {
1897 pr_warn("SELinux: rangetrans: invalid range\n");
1898 goto out;
1899 }
1900
1901 rc = hashtab_insert(&p->range_tr, rt, r, rangetr_key_params);
1902 if (rc)
1903 goto out;
1904
1905 rt = NULL;
1906 r = NULL;
1907 }
1908 hash_eval(&p->range_tr, "rangetr", NULL);
1909 rc = 0;
1910out:
1911 kfree(rt);
1912 kfree(r);
1913 return rc;
1914}
1915
1916static int filename_trans_read_helper_compat(struct policydb *p, void *fp)
1917{
1918 struct filename_trans_key key, *ft = NULL;
1919 struct filename_trans_datum *last, *datum = NULL;
1920 char *name = NULL;
1921 u32 len, stype, otype;
1922 __le32 buf[4];
1923 int rc;
1924
1925 /* length of the path component string */
1926 rc = next_entry(buf, fp, sizeof(u32));
1927 if (rc)
1928 return rc;
1929 len = le32_to_cpu(buf[0]);
1930
1931 /* path component string */
1932 rc = str_read(&name, GFP_KERNEL, fp, len);
1933 if (rc)
1934 return rc;
1935
1936 rc = next_entry(buf, fp, sizeof(u32) * 4);
1937 if (rc)
1938 goto out;
1939
1940 stype = le32_to_cpu(buf[0]);
1941 key.ttype = le32_to_cpu(buf[1]);
1942 key.tclass = le32_to_cpu(buf[2]);
1943 key.name = name;
1944
1945 otype = le32_to_cpu(buf[3]);
1946
1947 last = NULL;
1948 datum = policydb_filenametr_search(p, &key);
1949 while (datum) {
1950 if (unlikely(ebitmap_get_bit(&datum->stypes, stype - 1))) {
1951 /* conflicting/duplicate rules are ignored */
1952 datum = NULL;
1953 rc = 0;
1954 goto out;
1955 }
1956 if (likely(datum->otype == otype))
1957 break;
1958 last = datum;
1959 datum = datum->next;
1960 }
1961 if (!datum) {
1962 rc = -ENOMEM;
1963 datum = kmalloc(sizeof(*datum), GFP_KERNEL);
1964 if (!datum)
1965 goto out;
1966
1967 ebitmap_init(&datum->stypes);
1968 datum->otype = otype;
1969 datum->next = NULL;
1970
1971 if (unlikely(last)) {
1972 last->next = datum;
1973 } else {
1974 rc = -ENOMEM;
1975 ft = kmemdup(&key, sizeof(key), GFP_KERNEL);
1976 if (!ft)
1977 goto out;
1978
1979 rc = hashtab_insert(&p->filename_trans, ft, datum,
1980 filenametr_key_params);
1981 if (rc)
1982 goto out;
1983 name = NULL;
1984
1985 rc = ebitmap_set_bit(&p->filename_trans_ttypes,
1986 key.ttype, 1);
1987 if (rc)
1988 return rc;
1989 }
1990 }
1991 kfree(name);
1992 return ebitmap_set_bit(&datum->stypes, stype - 1, 1);
1993
1994out:
1995 kfree(ft);
1996 kfree(name);
1997 kfree(datum);
1998 return rc;
1999}
2000
2001static int filename_trans_read_helper(struct policydb *p, void *fp)
2002{
2003 struct filename_trans_key *ft = NULL;
2004 struct filename_trans_datum **dst, *datum, *first = NULL;
2005 char *name = NULL;
2006 u32 len, ttype, tclass, ndatum, i;
2007 __le32 buf[3];
2008 int rc;
2009
2010 /* length of the path component string */
2011 rc = next_entry(buf, fp, sizeof(u32));
2012 if (rc)
2013 return rc;
2014 len = le32_to_cpu(buf[0]);
2015
2016 /* path component string */
2017 rc = str_read(&name, GFP_KERNEL, fp, len);
2018 if (rc)
2019 return rc;
2020
2021 rc = next_entry(buf, fp, sizeof(u32) * 3);
2022 if (rc)
2023 goto out;
2024
2025 ttype = le32_to_cpu(buf[0]);
2026 tclass = le32_to_cpu(buf[1]);
2027
2028 ndatum = le32_to_cpu(buf[2]);
2029 if (ndatum == 0) {
2030 pr_err("SELinux: Filename transition key with no datum\n");
2031 rc = -ENOENT;
2032 goto out;
2033 }
2034
2035 dst = &first;
2036 for (i = 0; i < ndatum; i++) {
2037 rc = -ENOMEM;
2038 datum = kmalloc(sizeof(*datum), GFP_KERNEL);
2039 if (!datum)
2040 goto out;
2041
2042 datum->next = NULL;
2043 *dst = datum;
2044
2045 /* ebitmap_read() will at least init the bitmap */
2046 rc = ebitmap_read(&datum->stypes, fp);
2047 if (rc)
2048 goto out;
2049
2050 rc = next_entry(buf, fp, sizeof(u32));
2051 if (rc)
2052 goto out;
2053
2054 datum->otype = le32_to_cpu(buf[0]);
2055
2056 dst = &datum->next;
2057 }
2058
2059 rc = -ENOMEM;
2060 ft = kmalloc(sizeof(*ft), GFP_KERNEL);
2061 if (!ft)
2062 goto out;
2063
2064 ft->ttype = ttype;
2065 ft->tclass = tclass;
2066 ft->name = name;
2067
2068 rc = hashtab_insert(&p->filename_trans, ft, first,
2069 filenametr_key_params);
2070 if (rc == -EEXIST)
2071 pr_err("SELinux: Duplicate filename transition key\n");
2072 if (rc)
2073 goto out;
2074
2075 return ebitmap_set_bit(&p->filename_trans_ttypes, ttype, 1);
2076
2077out:
2078 kfree(ft);
2079 kfree(name);
2080 while (first) {
2081 datum = first;
2082 first = first->next;
2083
2084 ebitmap_destroy(&datum->stypes);
2085 kfree(datum);
2086 }
2087 return rc;
2088}
2089
2090static int filename_trans_read(struct policydb *p, void *fp)
2091{
2092 u32 nel, i;
2093 __le32 buf[1];
2094 int rc;
2095
2096 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
2097 return 0;
2098
2099 rc = next_entry(buf, fp, sizeof(u32));
2100 if (rc)
2101 return rc;
2102 nel = le32_to_cpu(buf[0]);
2103
2104 if (p->policyvers < POLICYDB_VERSION_COMP_FTRANS) {
2105 p->compat_filename_trans_count = nel;
2106
2107 rc = hashtab_init(&p->filename_trans, (1 << 11));
2108 if (rc)
2109 return rc;
2110
2111 for (i = 0; i < nel; i++) {
2112 rc = filename_trans_read_helper_compat(p, fp);
2113 if (rc)
2114 return rc;
2115 }
2116 } else {
2117 rc = hashtab_init(&p->filename_trans, nel);
2118 if (rc)
2119 return rc;
2120
2121 for (i = 0; i < nel; i++) {
2122 rc = filename_trans_read_helper(p, fp);
2123 if (rc)
2124 return rc;
2125 }
2126 }
2127 hash_eval(&p->filename_trans, "filenametr", NULL);
2128 return 0;
2129}
2130
2131static int genfs_read(struct policydb *p, void *fp)
2132{
2133 int rc;
2134 u32 i, j, nel, nel2, len, len2;
2135 __le32 buf[1];
2136 struct ocontext *l, *c;
2137 struct ocontext *newc = NULL;
2138 struct genfs *genfs_p, *genfs;
2139 struct genfs *newgenfs = NULL;
2140
2141 rc = next_entry(buf, fp, sizeof(u32));
2142 if (rc)
2143 return rc;
2144 nel = le32_to_cpu(buf[0]);
2145
2146 for (i = 0; i < nel; i++) {
2147 rc = next_entry(buf, fp, sizeof(u32));
2148 if (rc)
2149 goto out;
2150 len = le32_to_cpu(buf[0]);
2151
2152 rc = -ENOMEM;
2153 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
2154 if (!newgenfs)
2155 goto out;
2156
2157 rc = str_read(&newgenfs->fstype, GFP_KERNEL, fp, len);
2158 if (rc)
2159 goto out;
2160
2161 for (genfs_p = NULL, genfs = p->genfs; genfs;
2162 genfs_p = genfs, genfs = genfs->next) {
2163 rc = -EINVAL;
2164 if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
2165 pr_err("SELinux: dup genfs fstype %s\n",
2166 newgenfs->fstype);
2167 goto out;
2168 }
2169 if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
2170 break;
2171 }
2172 newgenfs->next = genfs;
2173 if (genfs_p)
2174 genfs_p->next = newgenfs;
2175 else
2176 p->genfs = newgenfs;
2177 genfs = newgenfs;
2178 newgenfs = NULL;
2179
2180 rc = next_entry(buf, fp, sizeof(u32));
2181 if (rc)
2182 goto out;
2183
2184 nel2 = le32_to_cpu(buf[0]);
2185 for (j = 0; j < nel2; j++) {
2186 rc = next_entry(buf, fp, sizeof(u32));
2187 if (rc)
2188 goto out;
2189 len = le32_to_cpu(buf[0]);
2190
2191 rc = -ENOMEM;
2192 newc = kzalloc(sizeof(*newc), GFP_KERNEL);
2193 if (!newc)
2194 goto out;
2195
2196 rc = str_read(&newc->u.name, GFP_KERNEL, fp, len);
2197 if (rc)
2198 goto out;
2199
2200 rc = next_entry(buf, fp, sizeof(u32));
2201 if (rc)
2202 goto out;
2203
2204 newc->v.sclass = le32_to_cpu(buf[0]);
2205 rc = context_read_and_validate(&newc->context[0], p,
2206 fp);
2207 if (rc)
2208 goto out;
2209
2210 for (l = NULL, c = genfs->head; c; l = c, c = c->next) {
2211 rc = -EINVAL;
2212 if (!strcmp(newc->u.name, c->u.name) &&
2213 (!c->v.sclass || !newc->v.sclass ||
2214 newc->v.sclass == c->v.sclass)) {
2215 pr_err("SELinux: dup genfs entry (%s,%s)\n",
2216 genfs->fstype, c->u.name);
2217 goto out;
2218 }
2219 len = strlen(newc->u.name);
2220 len2 = strlen(c->u.name);
2221 if (len > len2)
2222 break;
2223 }
2224
2225 newc->next = c;
2226 if (l)
2227 l->next = newc;
2228 else
2229 genfs->head = newc;
2230 newc = NULL;
2231 }
2232 }
2233 rc = 0;
2234out:
2235 if (newgenfs) {
2236 kfree(newgenfs->fstype);
2237 kfree(newgenfs);
2238 }
2239 ocontext_destroy(newc, OCON_FSUSE);
2240
2241 return rc;
2242}
2243
2244static int ocontext_read(struct policydb *p,
2245 const struct policydb_compat_info *info, void *fp)
2246{
2247 int rc;
2248 unsigned int i;
2249 u32 j, nel, len;
2250 __be64 prefixbuf[1];
2251 __le32 buf[3];
2252 struct ocontext *l, *c;
2253 u32 nodebuf[8];
2254
2255 for (i = 0; i < info->ocon_num; i++) {
2256 rc = next_entry(buf, fp, sizeof(u32));
2257 if (rc)
2258 goto out;
2259 nel = le32_to_cpu(buf[0]);
2260
2261 l = NULL;
2262 for (j = 0; j < nel; j++) {
2263 rc = -ENOMEM;
2264 c = kzalloc(sizeof(*c), GFP_KERNEL);
2265 if (!c)
2266 goto out;
2267 if (l)
2268 l->next = c;
2269 else
2270 p->ocontexts[i] = c;
2271 l = c;
2272
2273 switch (i) {
2274 case OCON_ISID:
2275 rc = next_entry(buf, fp, sizeof(u32));
2276 if (rc)
2277 goto out;
2278
2279 c->sid[0] = le32_to_cpu(buf[0]);
2280 rc = context_read_and_validate(&c->context[0],
2281 p, fp);
2282 if (rc)
2283 goto out;
2284 break;
2285 case OCON_FS:
2286 case OCON_NETIF:
2287 rc = next_entry(buf, fp, sizeof(u32));
2288 if (rc)
2289 goto out;
2290 len = le32_to_cpu(buf[0]);
2291
2292 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2293 if (rc)
2294 goto out;
2295
2296 if (i == OCON_FS)
2297 pr_warn("SELinux: void and deprecated fs ocon %s\n",
2298 c->u.name);
2299
2300 rc = context_read_and_validate(&c->context[0],
2301 p, fp);
2302 if (rc)
2303 goto out;
2304 rc = context_read_and_validate(&c->context[1],
2305 p, fp);
2306 if (rc)
2307 goto out;
2308 break;
2309 case OCON_PORT:
2310 rc = next_entry(buf, fp, sizeof(u32) * 3);
2311 if (rc)
2312 goto out;
2313 c->u.port.protocol = le32_to_cpu(buf[0]);
2314 c->u.port.low_port = le32_to_cpu(buf[1]);
2315 c->u.port.high_port = le32_to_cpu(buf[2]);
2316 rc = context_read_and_validate(&c->context[0],
2317 p, fp);
2318 if (rc)
2319 goto out;
2320 break;
2321 case OCON_NODE:
2322 rc = next_entry(nodebuf, fp, sizeof(u32) * 2);
2323 if (rc)
2324 goto out;
2325 c->u.node.addr = nodebuf[0]; /* network order */
2326 c->u.node.mask = nodebuf[1]; /* network order */
2327 rc = context_read_and_validate(&c->context[0],
2328 p, fp);
2329 if (rc)
2330 goto out;
2331 break;
2332 case OCON_FSUSE:
2333 rc = next_entry(buf, fp, sizeof(u32) * 2);
2334 if (rc)
2335 goto out;
2336
2337 rc = -EINVAL;
2338 c->v.behavior = le32_to_cpu(buf[0]);
2339 /* Determined at runtime, not in policy DB. */
2340 if (c->v.behavior == SECURITY_FS_USE_MNTPOINT)
2341 goto out;
2342 if (c->v.behavior > SECURITY_FS_USE_MAX)
2343 goto out;
2344
2345 len = le32_to_cpu(buf[1]);
2346 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2347 if (rc)
2348 goto out;
2349
2350 rc = context_read_and_validate(&c->context[0],
2351 p, fp);
2352 if (rc)
2353 goto out;
2354 break;
2355 case OCON_NODE6: {
2356 int k;
2357
2358 rc = next_entry(nodebuf, fp, sizeof(u32) * 8);
2359 if (rc)
2360 goto out;
2361 for (k = 0; k < 4; k++)
2362 c->u.node6.addr[k] = nodebuf[k];
2363 for (k = 0; k < 4; k++)
2364 c->u.node6.mask[k] = nodebuf[k + 4];
2365 rc = context_read_and_validate(&c->context[0],
2366 p, fp);
2367 if (rc)
2368 goto out;
2369 break;
2370 }
2371 case OCON_IBPKEY: {
2372 u32 pkey_lo, pkey_hi;
2373
2374 rc = next_entry(prefixbuf, fp, sizeof(u64));
2375 if (rc)
2376 goto out;
2377
2378 /* we need to have subnet_prefix in CPU order */
2379 c->u.ibpkey.subnet_prefix =
2380 be64_to_cpu(prefixbuf[0]);
2381
2382 rc = next_entry(buf, fp, sizeof(u32) * 2);
2383 if (rc)
2384 goto out;
2385
2386 pkey_lo = le32_to_cpu(buf[0]);
2387 pkey_hi = le32_to_cpu(buf[1]);
2388
2389 if (pkey_lo > U16_MAX || pkey_hi > U16_MAX) {
2390 rc = -EINVAL;
2391 goto out;
2392 }
2393
2394 c->u.ibpkey.low_pkey = pkey_lo;
2395 c->u.ibpkey.high_pkey = pkey_hi;
2396
2397 rc = context_read_and_validate(&c->context[0],
2398 p, fp);
2399 if (rc)
2400 goto out;
2401 break;
2402 }
2403 case OCON_IBENDPORT: {
2404 u32 port;
2405
2406 rc = next_entry(buf, fp, sizeof(u32) * 2);
2407 if (rc)
2408 goto out;
2409 len = le32_to_cpu(buf[0]);
2410
2411 rc = str_read(&c->u.ibendport.dev_name,
2412 GFP_KERNEL, fp, len);
2413 if (rc)
2414 goto out;
2415
2416 port = le32_to_cpu(buf[1]);
2417 if (port > U8_MAX || port == 0) {
2418 rc = -EINVAL;
2419 goto out;
2420 }
2421
2422 c->u.ibendport.port = port;
2423
2424 rc = context_read_and_validate(&c->context[0],
2425 p, fp);
2426 if (rc)
2427 goto out;
2428 break;
2429 } /* end case */
2430 } /* end switch */
2431 }
2432 }
2433 rc = 0;
2434out:
2435 return rc;
2436}
2437
2438/*
2439 * Read the configuration data from a policy database binary
2440 * representation file into a policy database structure.
2441 */
2442int policydb_read(struct policydb *p, void *fp)
2443{
2444 struct role_allow *ra, *lra;
2445 struct role_trans_key *rtk = NULL;
2446 struct role_trans_datum *rtd = NULL;
2447 int rc;
2448 __le32 buf[4];
2449 u32 i, j, len, nprim, nel, perm;
2450
2451 char *policydb_str;
2452 const struct policydb_compat_info *info;
2453
2454 policydb_init(p);
2455
2456 /* Read the magic number and string length. */
2457 rc = next_entry(buf, fp, sizeof(u32) * 2);
2458 if (rc)
2459 goto bad;
2460
2461 rc = -EINVAL;
2462 if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
2463 pr_err("SELinux: policydb magic number 0x%x does "
2464 "not match expected magic number 0x%x\n",
2465 le32_to_cpu(buf[0]), POLICYDB_MAGIC);
2466 goto bad;
2467 }
2468
2469 rc = -EINVAL;
2470 len = le32_to_cpu(buf[1]);
2471 if (len != strlen(POLICYDB_STRING)) {
2472 pr_err("SELinux: policydb string length %d does not "
2473 "match expected length %zu\n",
2474 len, strlen(POLICYDB_STRING));
2475 goto bad;
2476 }
2477
2478 rc = -ENOMEM;
2479 policydb_str = kmalloc(len + 1, GFP_KERNEL);
2480 if (!policydb_str) {
2481 pr_err("SELinux: unable to allocate memory for policydb "
2482 "string of length %d\n",
2483 len);
2484 goto bad;
2485 }
2486
2487 rc = next_entry(policydb_str, fp, len);
2488 if (rc) {
2489 pr_err("SELinux: truncated policydb string identifier\n");
2490 kfree(policydb_str);
2491 goto bad;
2492 }
2493
2494 rc = -EINVAL;
2495 policydb_str[len] = '\0';
2496 if (strcmp(policydb_str, POLICYDB_STRING)) {
2497 pr_err("SELinux: policydb string %s does not match "
2498 "my string %s\n",
2499 policydb_str, POLICYDB_STRING);
2500 kfree(policydb_str);
2501 goto bad;
2502 }
2503 /* Done with policydb_str. */
2504 kfree(policydb_str);
2505 policydb_str = NULL;
2506
2507 /* Read the version and table sizes. */
2508 rc = next_entry(buf, fp, sizeof(u32) * 4);
2509 if (rc)
2510 goto bad;
2511
2512 rc = -EINVAL;
2513 p->policyvers = le32_to_cpu(buf[0]);
2514 if (p->policyvers < POLICYDB_VERSION_MIN ||
2515 p->policyvers > POLICYDB_VERSION_MAX) {
2516 pr_err("SELinux: policydb version %d does not match "
2517 "my version range %d-%d\n",
2518 le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN,
2519 POLICYDB_VERSION_MAX);
2520 goto bad;
2521 }
2522
2523 if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
2524 p->mls_enabled = 1;
2525
2526 rc = -EINVAL;
2527 if (p->policyvers < POLICYDB_VERSION_MLS) {
2528 pr_err("SELinux: security policydb version %d "
2529 "(MLS) not backwards compatible\n",
2530 p->policyvers);
2531 goto bad;
2532 }
2533 }
2534 p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
2535 p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
2536
2537 if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
2538 rc = ebitmap_read(&p->policycaps, fp);
2539 if (rc)
2540 goto bad;
2541 }
2542
2543 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
2544 rc = ebitmap_read(&p->permissive_map, fp);
2545 if (rc)
2546 goto bad;
2547 }
2548
2549 rc = -EINVAL;
2550 info = policydb_lookup_compat(p->policyvers);
2551 if (!info) {
2552 pr_err("SELinux: unable to find policy compat info "
2553 "for version %d\n",
2554 p->policyvers);
2555 goto bad;
2556 }
2557
2558 rc = -EINVAL;
2559 if (le32_to_cpu(buf[2]) != info->sym_num ||
2560 le32_to_cpu(buf[3]) != info->ocon_num) {
2561 pr_err("SELinux: policydb table sizes (%d,%d) do "
2562 "not match mine (%d,%d)\n",
2563 le32_to_cpu(buf[2]), le32_to_cpu(buf[3]), info->sym_num,
2564 info->ocon_num);
2565 goto bad;
2566 }
2567
2568 for (i = 0; i < info->sym_num; i++) {
2569 rc = next_entry(buf, fp, sizeof(u32) * 2);
2570 if (rc)
2571 goto bad;
2572 nprim = le32_to_cpu(buf[0]);
2573 nel = le32_to_cpu(buf[1]);
2574
2575 rc = symtab_init(&p->symtab[i], nel);
2576 if (rc)
2577 goto out;
2578
2579 if (i == SYM_ROLES) {
2580 rc = roles_init(p);
2581 if (rc)
2582 goto out;
2583 }
2584
2585 for (j = 0; j < nel; j++) {
2586 rc = read_f[i](p, &p->symtab[i], fp);
2587 if (rc)
2588 goto bad;
2589 }
2590
2591 p->symtab[i].nprim = nprim;
2592 }
2593
2594 rc = -EINVAL;
2595 p->process_class = string_to_security_class(p, "process");
2596 if (!p->process_class) {
2597 pr_err("SELinux: process class is required, not defined in policy\n");
2598 goto bad;
2599 }
2600
2601 rc = avtab_read(&p->te_avtab, fp, p);
2602 if (rc)
2603 goto bad;
2604
2605 if (p->policyvers >= POLICYDB_VERSION_BOOL) {
2606 rc = cond_read_list(p, fp);
2607 if (rc)
2608 goto bad;
2609 }
2610
2611 rc = next_entry(buf, fp, sizeof(u32));
2612 if (rc)
2613 goto bad;
2614 nel = le32_to_cpu(buf[0]);
2615
2616 rc = hashtab_init(&p->role_tr, nel);
2617 if (rc)
2618 goto bad;
2619 for (i = 0; i < nel; i++) {
2620 rc = -ENOMEM;
2621 rtk = kmalloc(sizeof(*rtk), GFP_KERNEL);
2622 if (!rtk)
2623 goto bad;
2624
2625 rc = -ENOMEM;
2626 rtd = kmalloc(sizeof(*rtd), GFP_KERNEL);
2627 if (!rtd)
2628 goto bad;
2629
2630 rc = next_entry(buf, fp, sizeof(u32) * 3);
2631 if (rc)
2632 goto bad;
2633
2634 rtk->role = le32_to_cpu(buf[0]);
2635 rtk->type = le32_to_cpu(buf[1]);
2636 rtd->new_role = le32_to_cpu(buf[2]);
2637 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2638 rc = next_entry(buf, fp, sizeof(u32));
2639 if (rc)
2640 goto bad;
2641 rtk->tclass = le32_to_cpu(buf[0]);
2642 } else
2643 rtk->tclass = p->process_class;
2644
2645 rc = -EINVAL;
2646 if (!policydb_role_isvalid(p, rtk->role) ||
2647 !policydb_type_isvalid(p, rtk->type) ||
2648 !policydb_class_isvalid(p, rtk->tclass) ||
2649 !policydb_role_isvalid(p, rtd->new_role))
2650 goto bad;
2651
2652 rc = hashtab_insert(&p->role_tr, rtk, rtd, roletr_key_params);
2653 if (rc)
2654 goto bad;
2655
2656 rtk = NULL;
2657 rtd = NULL;
2658 }
2659
2660 hash_eval(&p->role_tr, "roletr", NULL);
2661
2662 rc = next_entry(buf, fp, sizeof(u32));
2663 if (rc)
2664 goto bad;
2665 nel = le32_to_cpu(buf[0]);
2666 lra = NULL;
2667 for (i = 0; i < nel; i++) {
2668 rc = -ENOMEM;
2669 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
2670 if (!ra)
2671 goto bad;
2672 if (lra)
2673 lra->next = ra;
2674 else
2675 p->role_allow = ra;
2676 rc = next_entry(buf, fp, sizeof(u32) * 2);
2677 if (rc)
2678 goto bad;
2679
2680 rc = -EINVAL;
2681 ra->role = le32_to_cpu(buf[0]);
2682 ra->new_role = le32_to_cpu(buf[1]);
2683 if (!policydb_role_isvalid(p, ra->role) ||
2684 !policydb_role_isvalid(p, ra->new_role))
2685 goto bad;
2686 lra = ra;
2687 }
2688
2689 rc = filename_trans_read(p, fp);
2690 if (rc)
2691 goto bad;
2692
2693 rc = policydb_index(p);
2694 if (rc)
2695 goto bad;
2696
2697 rc = -EINVAL;
2698 perm = string_to_av_perm(p, p->process_class, "transition");
2699 if (!perm) {
2700 pr_err("SELinux: process transition permission is required, not defined in policy\n");
2701 goto bad;
2702 }
2703 p->process_trans_perms = perm;
2704 perm = string_to_av_perm(p, p->process_class, "dyntransition");
2705 if (!perm) {
2706 pr_err("SELinux: process dyntransition permission is required, not defined in policy\n");
2707 goto bad;
2708 }
2709 p->process_trans_perms |= perm;
2710
2711 rc = ocontext_read(p, info, fp);
2712 if (rc)
2713 goto bad;
2714
2715 rc = genfs_read(p, fp);
2716 if (rc)
2717 goto bad;
2718
2719 rc = range_read(p, fp);
2720 if (rc)
2721 goto bad;
2722
2723 rc = -ENOMEM;
2724 p->type_attr_map_array = kvcalloc(
2725 p->p_types.nprim, sizeof(*p->type_attr_map_array), GFP_KERNEL);
2726 if (!p->type_attr_map_array)
2727 goto bad;
2728
2729 /* just in case ebitmap_init() becomes more than just a memset(0): */
2730 for (i = 0; i < p->p_types.nprim; i++)
2731 ebitmap_init(&p->type_attr_map_array[i]);
2732
2733 for (i = 0; i < p->p_types.nprim; i++) {
2734 struct ebitmap *e = &p->type_attr_map_array[i];
2735
2736 if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
2737 rc = ebitmap_read(e, fp);
2738 if (rc)
2739 goto bad;
2740 }
2741 /* add the type itself as the degenerate case */
2742 rc = ebitmap_set_bit(e, i, 1);
2743 if (rc)
2744 goto bad;
2745 }
2746
2747 rc = policydb_bounds_sanity_check(p);
2748 if (rc)
2749 goto bad;
2750
2751 rc = 0;
2752out:
2753 return rc;
2754bad:
2755 kfree(rtk);
2756 kfree(rtd);
2757 policydb_destroy(p);
2758 goto out;
2759}
2760
2761/*
2762 * Write a MLS level structure to a policydb binary
2763 * representation file.
2764 */
2765static int mls_write_level(struct mls_level *l, void *fp)
2766{
2767 __le32 buf[1];
2768 int rc;
2769
2770 buf[0] = cpu_to_le32(l->sens);
2771 rc = put_entry(buf, sizeof(u32), 1, fp);
2772 if (rc)
2773 return rc;
2774
2775 rc = ebitmap_write(&l->cat, fp);
2776 if (rc)
2777 return rc;
2778
2779 return 0;
2780}
2781
2782/*
2783 * Write a MLS range structure to a policydb binary
2784 * representation file.
2785 */
2786static int mls_write_range_helper(struct mls_range *r, void *fp)
2787{
2788 __le32 buf[3];
2789 size_t items;
2790 int rc, eq;
2791
2792 eq = mls_level_eq(&r->level[1], &r->level[0]);
2793
2794 if (eq)
2795 items = 2;
2796 else
2797 items = 3;
2798 buf[0] = cpu_to_le32(items - 1);
2799 buf[1] = cpu_to_le32(r->level[0].sens);
2800 if (!eq)
2801 buf[2] = cpu_to_le32(r->level[1].sens);
2802
2803 BUG_ON(items > ARRAY_SIZE(buf));
2804
2805 rc = put_entry(buf, sizeof(u32), items, fp);
2806 if (rc)
2807 return rc;
2808
2809 rc = ebitmap_write(&r->level[0].cat, fp);
2810 if (rc)
2811 return rc;
2812 if (!eq) {
2813 rc = ebitmap_write(&r->level[1].cat, fp);
2814 if (rc)
2815 return rc;
2816 }
2817
2818 return 0;
2819}
2820
2821static int sens_write(void *vkey, void *datum, void *ptr)
2822{
2823 char *key = vkey;
2824 struct level_datum *levdatum = datum;
2825 struct policy_data *pd = ptr;
2826 void *fp = pd->fp;
2827 __le32 buf[2];
2828 size_t len;
2829 int rc;
2830
2831 len = strlen(key);
2832 buf[0] = cpu_to_le32(len);
2833 buf[1] = cpu_to_le32(levdatum->isalias);
2834 rc = put_entry(buf, sizeof(u32), 2, fp);
2835 if (rc)
2836 return rc;
2837
2838 rc = put_entry(key, 1, len, fp);
2839 if (rc)
2840 return rc;
2841
2842 rc = mls_write_level(levdatum->level, fp);
2843 if (rc)
2844 return rc;
2845
2846 return 0;
2847}
2848
2849static int cat_write(void *vkey, void *datum, void *ptr)
2850{
2851 char *key = vkey;
2852 struct cat_datum *catdatum = datum;
2853 struct policy_data *pd = ptr;
2854 void *fp = pd->fp;
2855 __le32 buf[3];
2856 size_t len;
2857 int rc;
2858
2859 len = strlen(key);
2860 buf[0] = cpu_to_le32(len);
2861 buf[1] = cpu_to_le32(catdatum->value);
2862 buf[2] = cpu_to_le32(catdatum->isalias);
2863 rc = put_entry(buf, sizeof(u32), 3, fp);
2864 if (rc)
2865 return rc;
2866
2867 rc = put_entry(key, 1, len, fp);
2868 if (rc)
2869 return rc;
2870
2871 return 0;
2872}
2873
2874static int role_trans_write_one(void *key, void *datum, void *ptr)
2875{
2876 struct role_trans_key *rtk = key;
2877 struct role_trans_datum *rtd = datum;
2878 struct policy_data *pd = ptr;
2879 void *fp = pd->fp;
2880 struct policydb *p = pd->p;
2881 __le32 buf[3];
2882 int rc;
2883
2884 buf[0] = cpu_to_le32(rtk->role);
2885 buf[1] = cpu_to_le32(rtk->type);
2886 buf[2] = cpu_to_le32(rtd->new_role);
2887 rc = put_entry(buf, sizeof(u32), 3, fp);
2888 if (rc)
2889 return rc;
2890 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2891 buf[0] = cpu_to_le32(rtk->tclass);
2892 rc = put_entry(buf, sizeof(u32), 1, fp);
2893 if (rc)
2894 return rc;
2895 }
2896 return 0;
2897}
2898
2899static int role_trans_write(struct policydb *p, void *fp)
2900{
2901 struct policy_data pd = { .p = p, .fp = fp };
2902 __le32 buf[1];
2903 int rc;
2904
2905 buf[0] = cpu_to_le32(p->role_tr.nel);
2906 rc = put_entry(buf, sizeof(u32), 1, fp);
2907 if (rc)
2908 return rc;
2909
2910 return hashtab_map(&p->role_tr, role_trans_write_one, &pd);
2911}
2912
2913static int role_allow_write(struct role_allow *r, void *fp)
2914{
2915 struct role_allow *ra;
2916 __le32 buf[2];
2917 size_t nel;
2918 int rc;
2919
2920 nel = 0;
2921 for (ra = r; ra; ra = ra->next)
2922 nel++;
2923 buf[0] = cpu_to_le32(nel);
2924 rc = put_entry(buf, sizeof(u32), 1, fp);
2925 if (rc)
2926 return rc;
2927 for (ra = r; ra; ra = ra->next) {
2928 buf[0] = cpu_to_le32(ra->role);
2929 buf[1] = cpu_to_le32(ra->new_role);
2930 rc = put_entry(buf, sizeof(u32), 2, fp);
2931 if (rc)
2932 return rc;
2933 }
2934 return 0;
2935}
2936
2937/*
2938 * Write a security context structure
2939 * to a policydb binary representation file.
2940 */
2941static int context_write(struct policydb *p, struct context *c, void *fp)
2942{
2943 int rc;
2944 __le32 buf[3];
2945
2946 buf[0] = cpu_to_le32(c->user);
2947 buf[1] = cpu_to_le32(c->role);
2948 buf[2] = cpu_to_le32(c->type);
2949
2950 rc = put_entry(buf, sizeof(u32), 3, fp);
2951 if (rc)
2952 return rc;
2953
2954 rc = mls_write_range_helper(&c->range, fp);
2955 if (rc)
2956 return rc;
2957
2958 return 0;
2959}
2960
2961/*
2962 * The following *_write functions are used to
2963 * write the symbol data to a policy database
2964 * binary representation file.
2965 */
2966
2967static int perm_write(void *vkey, void *datum, void *fp)
2968{
2969 char *key = vkey;
2970 struct perm_datum *perdatum = datum;
2971 __le32 buf[2];
2972 size_t len;
2973 int rc;
2974
2975 len = strlen(key);
2976 buf[0] = cpu_to_le32(len);
2977 buf[1] = cpu_to_le32(perdatum->value);
2978 rc = put_entry(buf, sizeof(u32), 2, fp);
2979 if (rc)
2980 return rc;
2981
2982 rc = put_entry(key, 1, len, fp);
2983 if (rc)
2984 return rc;
2985
2986 return 0;
2987}
2988
2989static int common_write(void *vkey, void *datum, void *ptr)
2990{
2991 char *key = vkey;
2992 struct common_datum *comdatum = datum;
2993 struct policy_data *pd = ptr;
2994 void *fp = pd->fp;
2995 __le32 buf[4];
2996 size_t len;
2997 int rc;
2998
2999 len = strlen(key);
3000 buf[0] = cpu_to_le32(len);
3001 buf[1] = cpu_to_le32(comdatum->value);
3002 buf[2] = cpu_to_le32(comdatum->permissions.nprim);
3003 buf[3] = cpu_to_le32(comdatum->permissions.table.nel);
3004 rc = put_entry(buf, sizeof(u32), 4, fp);
3005 if (rc)
3006 return rc;
3007
3008 rc = put_entry(key, 1, len, fp);
3009 if (rc)
3010 return rc;
3011
3012 rc = hashtab_map(&comdatum->permissions.table, perm_write, fp);
3013 if (rc)
3014 return rc;
3015
3016 return 0;
3017}
3018
3019static int type_set_write(struct type_set *t, void *fp)
3020{
3021 int rc;
3022 __le32 buf[1];
3023
3024 if (ebitmap_write(&t->types, fp))
3025 return -EINVAL;
3026 if (ebitmap_write(&t->negset, fp))
3027 return -EINVAL;
3028
3029 buf[0] = cpu_to_le32(t->flags);
3030 rc = put_entry(buf, sizeof(u32), 1, fp);
3031 if (rc)
3032 return -EINVAL;
3033
3034 return 0;
3035}
3036
3037static int write_cons_helper(struct policydb *p, struct constraint_node *node,
3038 void *fp)
3039{
3040 struct constraint_node *c;
3041 struct constraint_expr *e;
3042 __le32 buf[3];
3043 u32 nel;
3044 int rc;
3045
3046 for (c = node; c; c = c->next) {
3047 nel = 0;
3048 for (e = c->expr; e; e = e->next)
3049 nel++;
3050 buf[0] = cpu_to_le32(c->permissions);
3051 buf[1] = cpu_to_le32(nel);
3052 rc = put_entry(buf, sizeof(u32), 2, fp);
3053 if (rc)
3054 return rc;
3055 for (e = c->expr; e; e = e->next) {
3056 buf[0] = cpu_to_le32(e->expr_type);
3057 buf[1] = cpu_to_le32(e->attr);
3058 buf[2] = cpu_to_le32(e->op);
3059 rc = put_entry(buf, sizeof(u32), 3, fp);
3060 if (rc)
3061 return rc;
3062
3063 switch (e->expr_type) {
3064 case CEXPR_NAMES:
3065 rc = ebitmap_write(&e->names, fp);
3066 if (rc)
3067 return rc;
3068 if (p->policyvers >=
3069 POLICYDB_VERSION_CONSTRAINT_NAMES) {
3070 rc = type_set_write(e->type_names, fp);
3071 if (rc)
3072 return rc;
3073 }
3074 break;
3075 default:
3076 break;
3077 }
3078 }
3079 }
3080
3081 return 0;
3082}
3083
3084static int class_write(void *vkey, void *datum, void *ptr)
3085{
3086 char *key = vkey;
3087 struct class_datum *cladatum = datum;
3088 struct policy_data *pd = ptr;
3089 void *fp = pd->fp;
3090 struct policydb *p = pd->p;
3091 struct constraint_node *c;
3092 __le32 buf[6];
3093 u32 ncons;
3094 size_t len, len2;
3095 int rc;
3096
3097 len = strlen(key);
3098 if (cladatum->comkey)
3099 len2 = strlen(cladatum->comkey);
3100 else
3101 len2 = 0;
3102
3103 ncons = 0;
3104 for (c = cladatum->constraints; c; c = c->next)
3105 ncons++;
3106
3107 buf[0] = cpu_to_le32(len);
3108 buf[1] = cpu_to_le32(len2);
3109 buf[2] = cpu_to_le32(cladatum->value);
3110 buf[3] = cpu_to_le32(cladatum->permissions.nprim);
3111 buf[4] = cpu_to_le32(cladatum->permissions.table.nel);
3112 buf[5] = cpu_to_le32(ncons);
3113 rc = put_entry(buf, sizeof(u32), 6, fp);
3114 if (rc)
3115 return rc;
3116
3117 rc = put_entry(key, 1, len, fp);
3118 if (rc)
3119 return rc;
3120
3121 if (cladatum->comkey) {
3122 rc = put_entry(cladatum->comkey, 1, len2, fp);
3123 if (rc)
3124 return rc;
3125 }
3126
3127 rc = hashtab_map(&cladatum->permissions.table, perm_write, fp);
3128 if (rc)
3129 return rc;
3130
3131 rc = write_cons_helper(p, cladatum->constraints, fp);
3132 if (rc)
3133 return rc;
3134
3135 /* write out the validatetrans rule */
3136 ncons = 0;
3137 for (c = cladatum->validatetrans; c; c = c->next)
3138 ncons++;
3139
3140 buf[0] = cpu_to_le32(ncons);
3141 rc = put_entry(buf, sizeof(u32), 1, fp);
3142 if (rc)
3143 return rc;
3144
3145 rc = write_cons_helper(p, cladatum->validatetrans, fp);
3146 if (rc)
3147 return rc;
3148
3149 if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
3150 buf[0] = cpu_to_le32(cladatum->default_user);
3151 buf[1] = cpu_to_le32(cladatum->default_role);
3152 buf[2] = cpu_to_le32(cladatum->default_range);
3153
3154 rc = put_entry(buf, sizeof(uint32_t), 3, fp);
3155 if (rc)
3156 return rc;
3157 }
3158
3159 if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
3160 buf[0] = cpu_to_le32(cladatum->default_type);
3161 rc = put_entry(buf, sizeof(uint32_t), 1, fp);
3162 if (rc)
3163 return rc;
3164 }
3165
3166 return 0;
3167}
3168
3169static int role_write(void *vkey, void *datum, void *ptr)
3170{
3171 char *key = vkey;
3172 struct role_datum *role = datum;
3173 struct policy_data *pd = ptr;
3174 void *fp = pd->fp;
3175 struct policydb *p = pd->p;
3176 __le32 buf[3];
3177 size_t items, len;
3178 int rc;
3179
3180 len = strlen(key);
3181 items = 0;
3182 buf[items++] = cpu_to_le32(len);
3183 buf[items++] = cpu_to_le32(role->value);
3184 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
3185 buf[items++] = cpu_to_le32(role->bounds);
3186
3187 BUG_ON(items > ARRAY_SIZE(buf));
3188
3189 rc = put_entry(buf, sizeof(u32), items, fp);
3190 if (rc)
3191 return rc;
3192
3193 rc = put_entry(key, 1, len, fp);
3194 if (rc)
3195 return rc;
3196
3197 rc = ebitmap_write(&role->dominates, fp);
3198 if (rc)
3199 return rc;
3200
3201 rc = ebitmap_write(&role->types, fp);
3202 if (rc)
3203 return rc;
3204
3205 return 0;
3206}
3207
3208static int type_write(void *vkey, void *datum, void *ptr)
3209{
3210 char *key = vkey;
3211 struct type_datum *typdatum = datum;
3212 struct policy_data *pd = ptr;
3213 struct policydb *p = pd->p;
3214 void *fp = pd->fp;
3215 __le32 buf[4];
3216 int rc;
3217 size_t items, len;
3218
3219 len = strlen(key);
3220 items = 0;
3221 buf[items++] = cpu_to_le32(len);
3222 buf[items++] = cpu_to_le32(typdatum->value);
3223 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
3224 u32 properties = 0;
3225
3226 if (typdatum->primary)
3227 properties |= TYPEDATUM_PROPERTY_PRIMARY;
3228
3229 if (typdatum->attribute)
3230 properties |= TYPEDATUM_PROPERTY_ATTRIBUTE;
3231
3232 buf[items++] = cpu_to_le32(properties);
3233 buf[items++] = cpu_to_le32(typdatum->bounds);
3234 } else {
3235 buf[items++] = cpu_to_le32(typdatum->primary);
3236 }
3237 BUG_ON(items > ARRAY_SIZE(buf));
3238 rc = put_entry(buf, sizeof(u32), items, fp);
3239 if (rc)
3240 return rc;
3241
3242 rc = put_entry(key, 1, len, fp);
3243 if (rc)
3244 return rc;
3245
3246 return 0;
3247}
3248
3249static int user_write(void *vkey, void *datum, void *ptr)
3250{
3251 char *key = vkey;
3252 struct user_datum *usrdatum = datum;
3253 struct policy_data *pd = ptr;
3254 struct policydb *p = pd->p;
3255 void *fp = pd->fp;
3256 __le32 buf[3];
3257 size_t items, len;
3258 int rc;
3259
3260 len = strlen(key);
3261 items = 0;
3262 buf[items++] = cpu_to_le32(len);
3263 buf[items++] = cpu_to_le32(usrdatum->value);
3264 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
3265 buf[items++] = cpu_to_le32(usrdatum->bounds);
3266 BUG_ON(items > ARRAY_SIZE(buf));
3267 rc = put_entry(buf, sizeof(u32), items, fp);
3268 if (rc)
3269 return rc;
3270
3271 rc = put_entry(key, 1, len, fp);
3272 if (rc)
3273 return rc;
3274
3275 rc = ebitmap_write(&usrdatum->roles, fp);
3276 if (rc)
3277 return rc;
3278
3279 rc = mls_write_range_helper(&usrdatum->range, fp);
3280 if (rc)
3281 return rc;
3282
3283 rc = mls_write_level(&usrdatum->dfltlevel, fp);
3284 if (rc)
3285 return rc;
3286
3287 return 0;
3288}
3289
3290/* clang-format off */
3291static int (*const write_f[SYM_NUM])(void *key, void *datum, void *datap) = {
3292 common_write,
3293 class_write,
3294 role_write,
3295 type_write,
3296 user_write,
3297 cond_write_bool,
3298 sens_write,
3299 cat_write,
3300};
3301/* clang-format on */
3302
3303static int ocontext_write(struct policydb *p,
3304 const struct policydb_compat_info *info, void *fp)
3305{
3306 unsigned int i, j;
3307 int rc;
3308 size_t nel, len;
3309 __be64 prefixbuf[1];
3310 __le32 buf[3];
3311 u32 nodebuf[8];
3312 struct ocontext *c;
3313 for (i = 0; i < info->ocon_num; i++) {
3314 nel = 0;
3315 for (c = p->ocontexts[i]; c; c = c->next)
3316 nel++;
3317 buf[0] = cpu_to_le32(nel);
3318 rc = put_entry(buf, sizeof(u32), 1, fp);
3319 if (rc)
3320 return rc;
3321 for (c = p->ocontexts[i]; c; c = c->next) {
3322 switch (i) {
3323 case OCON_ISID:
3324 buf[0] = cpu_to_le32(c->sid[0]);
3325 rc = put_entry(buf, sizeof(u32), 1, fp);
3326 if (rc)
3327 return rc;
3328 rc = context_write(p, &c->context[0], fp);
3329 if (rc)
3330 return rc;
3331 break;
3332 case OCON_FS:
3333 case OCON_NETIF:
3334 len = strlen(c->u.name);
3335 buf[0] = cpu_to_le32(len);
3336 rc = put_entry(buf, sizeof(u32), 1, fp);
3337 if (rc)
3338 return rc;
3339 rc = put_entry(c->u.name, 1, len, fp);
3340 if (rc)
3341 return rc;
3342 rc = context_write(p, &c->context[0], fp);
3343 if (rc)
3344 return rc;
3345 rc = context_write(p, &c->context[1], fp);
3346 if (rc)
3347 return rc;
3348 break;
3349 case OCON_PORT:
3350 buf[0] = cpu_to_le32(c->u.port.protocol);
3351 buf[1] = cpu_to_le32(c->u.port.low_port);
3352 buf[2] = cpu_to_le32(c->u.port.high_port);
3353 rc = put_entry(buf, sizeof(u32), 3, 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_NODE:
3361 nodebuf[0] = c->u.node.addr; /* network order */
3362 nodebuf[1] = c->u.node.mask; /* network order */
3363 rc = put_entry(nodebuf, sizeof(u32), 2, fp);
3364 if (rc)
3365 return rc;
3366 rc = context_write(p, &c->context[0], fp);
3367 if (rc)
3368 return rc;
3369 break;
3370 case OCON_FSUSE:
3371 buf[0] = cpu_to_le32(c->v.behavior);
3372 len = strlen(c->u.name);
3373 buf[1] = cpu_to_le32(len);
3374 rc = put_entry(buf, sizeof(u32), 2, fp);
3375 if (rc)
3376 return rc;
3377 rc = put_entry(c->u.name, 1, len, fp);
3378 if (rc)
3379 return rc;
3380 rc = context_write(p, &c->context[0], fp);
3381 if (rc)
3382 return rc;
3383 break;
3384 case OCON_NODE6:
3385 for (j = 0; j < 4; j++)
3386 nodebuf[j] =
3387 c->u.node6.addr
3388 [j]; /* network order */
3389 for (j = 0; j < 4; j++)
3390 nodebuf[j + 4] =
3391 c->u.node6.mask
3392 [j]; /* network order */
3393 rc = put_entry(nodebuf, sizeof(u32), 8, fp);
3394 if (rc)
3395 return rc;
3396 rc = context_write(p, &c->context[0], fp);
3397 if (rc)
3398 return rc;
3399 break;
3400 case OCON_IBPKEY:
3401 /* subnet_prefix is in CPU order */
3402 prefixbuf[0] =
3403 cpu_to_be64(c->u.ibpkey.subnet_prefix);
3404
3405 rc = put_entry(prefixbuf, sizeof(u64), 1, fp);
3406 if (rc)
3407 return rc;
3408
3409 buf[0] = cpu_to_le32(c->u.ibpkey.low_pkey);
3410 buf[1] = cpu_to_le32(c->u.ibpkey.high_pkey);
3411
3412 rc = put_entry(buf, sizeof(u32), 2, fp);
3413 if (rc)
3414 return rc;
3415 rc = context_write(p, &c->context[0], fp);
3416 if (rc)
3417 return rc;
3418 break;
3419 case OCON_IBENDPORT:
3420 len = strlen(c->u.ibendport.dev_name);
3421 buf[0] = cpu_to_le32(len);
3422 buf[1] = cpu_to_le32(c->u.ibendport.port);
3423 rc = put_entry(buf, sizeof(u32), 2, fp);
3424 if (rc)
3425 return rc;
3426 rc = put_entry(c->u.ibendport.dev_name, 1, len,
3427 fp);
3428 if (rc)
3429 return rc;
3430 rc = context_write(p, &c->context[0], fp);
3431 if (rc)
3432 return rc;
3433 break;
3434 }
3435 }
3436 }
3437 return 0;
3438}
3439
3440static int genfs_write(struct policydb *p, void *fp)
3441{
3442 struct genfs *genfs;
3443 struct ocontext *c;
3444 size_t len;
3445 __le32 buf[1];
3446 int rc;
3447
3448 len = 0;
3449 for (genfs = p->genfs; genfs; genfs = genfs->next)
3450 len++;
3451 buf[0] = cpu_to_le32(len);
3452 rc = put_entry(buf, sizeof(u32), 1, fp);
3453 if (rc)
3454 return rc;
3455 for (genfs = p->genfs; genfs; genfs = genfs->next) {
3456 len = strlen(genfs->fstype);
3457 buf[0] = cpu_to_le32(len);
3458 rc = put_entry(buf, sizeof(u32), 1, fp);
3459 if (rc)
3460 return rc;
3461 rc = put_entry(genfs->fstype, 1, len, fp);
3462 if (rc)
3463 return rc;
3464 len = 0;
3465 for (c = genfs->head; c; c = c->next)
3466 len++;
3467 buf[0] = cpu_to_le32(len);
3468 rc = put_entry(buf, sizeof(u32), 1, fp);
3469 if (rc)
3470 return rc;
3471 for (c = genfs->head; c; c = c->next) {
3472 len = strlen(c->u.name);
3473 buf[0] = cpu_to_le32(len);
3474 rc = put_entry(buf, sizeof(u32), 1, fp);
3475 if (rc)
3476 return rc;
3477 rc = put_entry(c->u.name, 1, len, fp);
3478 if (rc)
3479 return rc;
3480 buf[0] = cpu_to_le32(c->v.sclass);
3481 rc = put_entry(buf, sizeof(u32), 1, fp);
3482 if (rc)
3483 return rc;
3484 rc = context_write(p, &c->context[0], fp);
3485 if (rc)
3486 return rc;
3487 }
3488 }
3489 return 0;
3490}
3491
3492static int range_write_helper(void *key, void *data, void *ptr)
3493{
3494 __le32 buf[2];
3495 struct range_trans *rt = key;
3496 struct mls_range *r = data;
3497 struct policy_data *pd = ptr;
3498 void *fp = pd->fp;
3499 struct policydb *p = pd->p;
3500 int rc;
3501
3502 buf[0] = cpu_to_le32(rt->source_type);
3503 buf[1] = cpu_to_le32(rt->target_type);
3504 rc = put_entry(buf, sizeof(u32), 2, fp);
3505 if (rc)
3506 return rc;
3507 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
3508 buf[0] = cpu_to_le32(rt->target_class);
3509 rc = put_entry(buf, sizeof(u32), 1, fp);
3510 if (rc)
3511 return rc;
3512 }
3513 rc = mls_write_range_helper(r, fp);
3514 if (rc)
3515 return rc;
3516
3517 return 0;
3518}
3519
3520static int range_write(struct policydb *p, void *fp)
3521{
3522 __le32 buf[1];
3523 int rc;
3524 struct policy_data pd;
3525
3526 pd.p = p;
3527 pd.fp = fp;
3528
3529 buf[0] = cpu_to_le32(p->range_tr.nel);
3530 rc = put_entry(buf, sizeof(u32), 1, fp);
3531 if (rc)
3532 return rc;
3533
3534 /* actually write all of the entries */
3535 rc = hashtab_map(&p->range_tr, range_write_helper, &pd);
3536 if (rc)
3537 return rc;
3538
3539 return 0;
3540}
3541
3542static int filename_write_helper_compat(void *key, void *data, void *ptr)
3543{
3544 struct filename_trans_key *ft = key;
3545 struct filename_trans_datum *datum = data;
3546 struct ebitmap_node *node;
3547 void *fp = ptr;
3548 __le32 buf[4];
3549 int rc;
3550 u32 bit, len = strlen(ft->name);
3551
3552 do {
3553 ebitmap_for_each_positive_bit(&datum->stypes, node, bit)
3554 {
3555 buf[0] = cpu_to_le32(len);
3556 rc = put_entry(buf, sizeof(u32), 1, fp);
3557 if (rc)
3558 return rc;
3559
3560 rc = put_entry(ft->name, sizeof(char), len, fp);
3561 if (rc)
3562 return rc;
3563
3564 buf[0] = cpu_to_le32(bit + 1);
3565 buf[1] = cpu_to_le32(ft->ttype);
3566 buf[2] = cpu_to_le32(ft->tclass);
3567 buf[3] = cpu_to_le32(datum->otype);
3568
3569 rc = put_entry(buf, sizeof(u32), 4, fp);
3570 if (rc)
3571 return rc;
3572 }
3573
3574 datum = datum->next;
3575 } while (unlikely(datum));
3576
3577 return 0;
3578}
3579
3580static int filename_write_helper(void *key, void *data, void *ptr)
3581{
3582 struct filename_trans_key *ft = key;
3583 struct filename_trans_datum *datum;
3584 void *fp = ptr;
3585 __le32 buf[3];
3586 int rc;
3587 u32 ndatum, len = strlen(ft->name);
3588
3589 buf[0] = cpu_to_le32(len);
3590 rc = put_entry(buf, sizeof(u32), 1, fp);
3591 if (rc)
3592 return rc;
3593
3594 rc = put_entry(ft->name, sizeof(char), len, fp);
3595 if (rc)
3596 return rc;
3597
3598 ndatum = 0;
3599 datum = data;
3600 do {
3601 ndatum++;
3602 datum = datum->next;
3603 } while (unlikely(datum));
3604
3605 buf[0] = cpu_to_le32(ft->ttype);
3606 buf[1] = cpu_to_le32(ft->tclass);
3607 buf[2] = cpu_to_le32(ndatum);
3608 rc = put_entry(buf, sizeof(u32), 3, fp);
3609 if (rc)
3610 return rc;
3611
3612 datum = data;
3613 do {
3614 rc = ebitmap_write(&datum->stypes, fp);
3615 if (rc)
3616 return rc;
3617
3618 buf[0] = cpu_to_le32(datum->otype);
3619 rc = put_entry(buf, sizeof(u32), 1, fp);
3620 if (rc)
3621 return rc;
3622
3623 datum = datum->next;
3624 } while (unlikely(datum));
3625
3626 return 0;
3627}
3628
3629static int filename_trans_write(struct policydb *p, void *fp)
3630{
3631 __le32 buf[1];
3632 int rc;
3633
3634 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
3635 return 0;
3636
3637 if (p->policyvers < POLICYDB_VERSION_COMP_FTRANS) {
3638 buf[0] = cpu_to_le32(p->compat_filename_trans_count);
3639 rc = put_entry(buf, sizeof(u32), 1, fp);
3640 if (rc)
3641 return rc;
3642
3643 rc = hashtab_map(&p->filename_trans,
3644 filename_write_helper_compat, fp);
3645 } else {
3646 buf[0] = cpu_to_le32(p->filename_trans.nel);
3647 rc = put_entry(buf, sizeof(u32), 1, fp);
3648 if (rc)
3649 return rc;
3650
3651 rc = hashtab_map(&p->filename_trans, filename_write_helper, fp);
3652 }
3653 return rc;
3654}
3655
3656/*
3657 * Write the configuration data in a policy database
3658 * structure to a policy database binary representation
3659 * file.
3660 */
3661int policydb_write(struct policydb *p, void *fp)
3662{
3663 unsigned int num_syms;
3664 int rc;
3665 __le32 buf[4];
3666 u32 config, i;
3667 size_t len;
3668 const struct policydb_compat_info *info;
3669
3670 /*
3671 * refuse to write policy older than compressed avtab
3672 * to simplify the writer. There are other tests dropped
3673 * since we assume this throughout the writer code. Be
3674 * careful if you ever try to remove this restriction
3675 */
3676 if (p->policyvers < POLICYDB_VERSION_AVTAB) {
3677 pr_err("SELinux: refusing to write policy version %d."
3678 " Because it is less than version %d\n",
3679 p->policyvers, POLICYDB_VERSION_AVTAB);
3680 return -EINVAL;
3681 }
3682
3683 config = 0;
3684 if (p->mls_enabled)
3685 config |= POLICYDB_CONFIG_MLS;
3686
3687 if (p->reject_unknown)
3688 config |= REJECT_UNKNOWN;
3689 if (p->allow_unknown)
3690 config |= ALLOW_UNKNOWN;
3691
3692 /* Write the magic number and string identifiers. */
3693 buf[0] = cpu_to_le32(POLICYDB_MAGIC);
3694 len = strlen(POLICYDB_STRING);
3695 buf[1] = cpu_to_le32(len);
3696 rc = put_entry(buf, sizeof(u32), 2, fp);
3697 if (rc)
3698 return rc;
3699 rc = put_entry(POLICYDB_STRING, 1, len, fp);
3700 if (rc)
3701 return rc;
3702
3703 /* Write the version, config, and table sizes. */
3704 info = policydb_lookup_compat(p->policyvers);
3705 if (!info) {
3706 pr_err("SELinux: compatibility lookup failed for policy "
3707 "version %d\n",
3708 p->policyvers);
3709 return -EINVAL;
3710 }
3711
3712 buf[0] = cpu_to_le32(p->policyvers);
3713 buf[1] = cpu_to_le32(config);
3714 buf[2] = cpu_to_le32(info->sym_num);
3715 buf[3] = cpu_to_le32(info->ocon_num);
3716
3717 rc = put_entry(buf, sizeof(u32), 4, fp);
3718 if (rc)
3719 return rc;
3720
3721 if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
3722 rc = ebitmap_write(&p->policycaps, fp);
3723 if (rc)
3724 return rc;
3725 }
3726
3727 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
3728 rc = ebitmap_write(&p->permissive_map, fp);
3729 if (rc)
3730 return rc;
3731 }
3732
3733 num_syms = info->sym_num;
3734 for (i = 0; i < num_syms; i++) {
3735 struct policy_data pd;
3736
3737 pd.fp = fp;
3738 pd.p = p;
3739
3740 buf[0] = cpu_to_le32(p->symtab[i].nprim);
3741 buf[1] = cpu_to_le32(p->symtab[i].table.nel);
3742
3743 rc = put_entry(buf, sizeof(u32), 2, fp);
3744 if (rc)
3745 return rc;
3746 rc = hashtab_map(&p->symtab[i].table, write_f[i], &pd);
3747 if (rc)
3748 return rc;
3749 }
3750
3751 rc = avtab_write(p, &p->te_avtab, fp);
3752 if (rc)
3753 return rc;
3754
3755 rc = cond_write_list(p, fp);
3756 if (rc)
3757 return rc;
3758
3759 rc = role_trans_write(p, fp);
3760 if (rc)
3761 return rc;
3762
3763 rc = role_allow_write(p->role_allow, fp);
3764 if (rc)
3765 return rc;
3766
3767 rc = filename_trans_write(p, fp);
3768 if (rc)
3769 return rc;
3770
3771 rc = ocontext_write(p, info, fp);
3772 if (rc)
3773 return rc;
3774
3775 rc = genfs_write(p, fp);
3776 if (rc)
3777 return rc;
3778
3779 rc = range_write(p, fp);
3780 if (rc)
3781 return rc;
3782
3783 for (i = 0; i < p->p_types.nprim; i++) {
3784 struct ebitmap *e = &p->type_attr_map_array[i];
3785
3786 rc = ebitmap_write(e, fp);
3787 if (rc)
3788 return rc;
3789 }
3790
3791 return 0;
3792}