Loading...
1/*
2 * Implementation of the policy database.
3 *
4 * Author : Stephen Smalley, <sds@tycho.nsa.gov>
5 */
6
7/*
8 * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
9 *
10 * Support for enhanced MLS infrastructure.
11 *
12 * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
13 *
14 * Added conditional policy language extensions
15 *
16 * Updated: Hewlett-Packard <paul@paul-moore.com>
17 *
18 * Added support for the policy capability bitmap
19 *
20 * Update: Mellanox Techonologies
21 *
22 * Added Infiniband support
23 *
24 * Copyright (C) 2016 Mellanox Techonologies
25 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
26 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
27 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
28 * This program is free software; you can redistribute it and/or modify
29 * it under the terms of the GNU General Public License as published by
30 * the Free Software Foundation, version 2.
31 */
32
33#include <linux/kernel.h>
34#include <linux/sched.h>
35#include <linux/slab.h>
36#include <linux/string.h>
37#include <linux/errno.h>
38#include <linux/audit.h>
39#include <linux/flex_array.h>
40#include "security.h"
41
42#include "policydb.h"
43#include "conditional.h"
44#include "mls.h"
45#include "services.h"
46
47#define _DEBUG_HASHES
48
49#ifdef DEBUG_HASHES
50static const char *symtab_name[SYM_NUM] = {
51 "common prefixes",
52 "classes",
53 "roles",
54 "types",
55 "users",
56 "bools",
57 "levels",
58 "categories",
59};
60#endif
61
62static unsigned int symtab_sizes[SYM_NUM] = {
63 2,
64 32,
65 16,
66 512,
67 128,
68 16,
69 16,
70 16,
71};
72
73struct policydb_compat_info {
74 int version;
75 int sym_num;
76 int ocon_num;
77};
78
79/* These need to be updated if SYM_NUM or OCON_NUM changes */
80static struct policydb_compat_info policydb_compat[] = {
81 {
82 .version = POLICYDB_VERSION_BASE,
83 .sym_num = SYM_NUM - 3,
84 .ocon_num = OCON_NUM - 3,
85 },
86 {
87 .version = POLICYDB_VERSION_BOOL,
88 .sym_num = SYM_NUM - 2,
89 .ocon_num = OCON_NUM - 3,
90 },
91 {
92 .version = POLICYDB_VERSION_IPV6,
93 .sym_num = SYM_NUM - 2,
94 .ocon_num = OCON_NUM - 2,
95 },
96 {
97 .version = POLICYDB_VERSION_NLCLASS,
98 .sym_num = SYM_NUM - 2,
99 .ocon_num = OCON_NUM - 2,
100 },
101 {
102 .version = POLICYDB_VERSION_MLS,
103 .sym_num = SYM_NUM,
104 .ocon_num = OCON_NUM - 2,
105 },
106 {
107 .version = POLICYDB_VERSION_AVTAB,
108 .sym_num = SYM_NUM,
109 .ocon_num = OCON_NUM - 2,
110 },
111 {
112 .version = POLICYDB_VERSION_RANGETRANS,
113 .sym_num = SYM_NUM,
114 .ocon_num = OCON_NUM - 2,
115 },
116 {
117 .version = POLICYDB_VERSION_POLCAP,
118 .sym_num = SYM_NUM,
119 .ocon_num = OCON_NUM - 2,
120 },
121 {
122 .version = POLICYDB_VERSION_PERMISSIVE,
123 .sym_num = SYM_NUM,
124 .ocon_num = OCON_NUM - 2,
125 },
126 {
127 .version = POLICYDB_VERSION_BOUNDARY,
128 .sym_num = SYM_NUM,
129 .ocon_num = OCON_NUM - 2,
130 },
131 {
132 .version = POLICYDB_VERSION_FILENAME_TRANS,
133 .sym_num = SYM_NUM,
134 .ocon_num = OCON_NUM - 2,
135 },
136 {
137 .version = POLICYDB_VERSION_ROLETRANS,
138 .sym_num = SYM_NUM,
139 .ocon_num = OCON_NUM - 2,
140 },
141 {
142 .version = POLICYDB_VERSION_NEW_OBJECT_DEFAULTS,
143 .sym_num = SYM_NUM,
144 .ocon_num = OCON_NUM - 2,
145 },
146 {
147 .version = POLICYDB_VERSION_DEFAULT_TYPE,
148 .sym_num = SYM_NUM,
149 .ocon_num = OCON_NUM - 2,
150 },
151 {
152 .version = POLICYDB_VERSION_CONSTRAINT_NAMES,
153 .sym_num = SYM_NUM,
154 .ocon_num = OCON_NUM - 2,
155 },
156 {
157 .version = POLICYDB_VERSION_XPERMS_IOCTL,
158 .sym_num = SYM_NUM,
159 .ocon_num = OCON_NUM - 2,
160 },
161 {
162 .version = POLICYDB_VERSION_INFINIBAND,
163 .sym_num = SYM_NUM,
164 .ocon_num = OCON_NUM,
165 },
166};
167
168static struct policydb_compat_info *policydb_lookup_compat(int version)
169{
170 int i;
171 struct policydb_compat_info *info = NULL;
172
173 for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) {
174 if (policydb_compat[i].version == version) {
175 info = &policydb_compat[i];
176 break;
177 }
178 }
179 return info;
180}
181
182/*
183 * Initialize the role table.
184 */
185static int roles_init(struct policydb *p)
186{
187 char *key = NULL;
188 int rc;
189 struct role_datum *role;
190
191 role = kzalloc(sizeof(*role), GFP_KERNEL);
192 if (!role)
193 return -ENOMEM;
194
195 rc = -EINVAL;
196 role->value = ++p->p_roles.nprim;
197 if (role->value != OBJECT_R_VAL)
198 goto out;
199
200 rc = -ENOMEM;
201 key = kstrdup(OBJECT_R, GFP_KERNEL);
202 if (!key)
203 goto out;
204
205 rc = hashtab_insert(p->p_roles.table, key, role);
206 if (rc)
207 goto out;
208
209 return 0;
210out:
211 kfree(key);
212 kfree(role);
213 return rc;
214}
215
216static u32 filenametr_hash(struct hashtab *h, const void *k)
217{
218 const struct filename_trans *ft = k;
219 unsigned long hash;
220 unsigned int byte_num;
221 unsigned char focus;
222
223 hash = ft->stype ^ ft->ttype ^ ft->tclass;
224
225 byte_num = 0;
226 while ((focus = ft->name[byte_num++]))
227 hash = partial_name_hash(focus, hash);
228 return hash & (h->size - 1);
229}
230
231static int filenametr_cmp(struct hashtab *h, const void *k1, const void *k2)
232{
233 const struct filename_trans *ft1 = k1;
234 const struct filename_trans *ft2 = k2;
235 int v;
236
237 v = ft1->stype - ft2->stype;
238 if (v)
239 return v;
240
241 v = ft1->ttype - ft2->ttype;
242 if (v)
243 return v;
244
245 v = ft1->tclass - ft2->tclass;
246 if (v)
247 return v;
248
249 return strcmp(ft1->name, ft2->name);
250
251}
252
253static u32 rangetr_hash(struct hashtab *h, const void *k)
254{
255 const struct range_trans *key = k;
256 return (key->source_type + (key->target_type << 3) +
257 (key->target_class << 5)) & (h->size - 1);
258}
259
260static int rangetr_cmp(struct hashtab *h, const void *k1, const void *k2)
261{
262 const struct range_trans *key1 = k1, *key2 = k2;
263 int v;
264
265 v = key1->source_type - key2->source_type;
266 if (v)
267 return v;
268
269 v = key1->target_type - key2->target_type;
270 if (v)
271 return v;
272
273 v = key1->target_class - key2->target_class;
274
275 return v;
276}
277
278/*
279 * Initialize a policy database structure.
280 */
281static int policydb_init(struct policydb *p)
282{
283 int i, rc;
284
285 memset(p, 0, sizeof(*p));
286
287 for (i = 0; i < SYM_NUM; i++) {
288 rc = symtab_init(&p->symtab[i], symtab_sizes[i]);
289 if (rc)
290 goto out;
291 }
292
293 rc = avtab_init(&p->te_avtab);
294 if (rc)
295 goto out;
296
297 rc = roles_init(p);
298 if (rc)
299 goto out;
300
301 rc = cond_policydb_init(p);
302 if (rc)
303 goto out;
304
305 p->filename_trans = hashtab_create(filenametr_hash, filenametr_cmp, (1 << 10));
306 if (!p->filename_trans) {
307 rc = -ENOMEM;
308 goto out;
309 }
310
311 p->range_tr = hashtab_create(rangetr_hash, rangetr_cmp, 256);
312 if (!p->range_tr) {
313 rc = -ENOMEM;
314 goto out;
315 }
316
317 ebitmap_init(&p->filename_trans_ttypes);
318 ebitmap_init(&p->policycaps);
319 ebitmap_init(&p->permissive_map);
320
321 return 0;
322out:
323 hashtab_destroy(p->filename_trans);
324 hashtab_destroy(p->range_tr);
325 for (i = 0; i < SYM_NUM; i++)
326 hashtab_destroy(p->symtab[i].table);
327 return rc;
328}
329
330/*
331 * The following *_index functions are used to
332 * define the val_to_name and val_to_struct arrays
333 * in a policy database structure. The val_to_name
334 * arrays are used when converting security context
335 * structures into string representations. The
336 * val_to_struct arrays are used when the attributes
337 * of a class, role, or user are needed.
338 */
339
340static int common_index(void *key, void *datum, void *datap)
341{
342 struct policydb *p;
343 struct common_datum *comdatum;
344 struct flex_array *fa;
345
346 comdatum = datum;
347 p = datap;
348 if (!comdatum->value || comdatum->value > p->p_commons.nprim)
349 return -EINVAL;
350
351 fa = p->sym_val_to_name[SYM_COMMONS];
352 if (flex_array_put_ptr(fa, comdatum->value - 1, key,
353 GFP_KERNEL | __GFP_ZERO))
354 BUG();
355 return 0;
356}
357
358static int class_index(void *key, void *datum, void *datap)
359{
360 struct policydb *p;
361 struct class_datum *cladatum;
362 struct flex_array *fa;
363
364 cladatum = datum;
365 p = datap;
366 if (!cladatum->value || cladatum->value > p->p_classes.nprim)
367 return -EINVAL;
368 fa = p->sym_val_to_name[SYM_CLASSES];
369 if (flex_array_put_ptr(fa, cladatum->value - 1, key,
370 GFP_KERNEL | __GFP_ZERO))
371 BUG();
372 p->class_val_to_struct[cladatum->value - 1] = cladatum;
373 return 0;
374}
375
376static int role_index(void *key, void *datum, void *datap)
377{
378 struct policydb *p;
379 struct role_datum *role;
380 struct flex_array *fa;
381
382 role = datum;
383 p = datap;
384 if (!role->value
385 || role->value > p->p_roles.nprim
386 || role->bounds > p->p_roles.nprim)
387 return -EINVAL;
388
389 fa = p->sym_val_to_name[SYM_ROLES];
390 if (flex_array_put_ptr(fa, role->value - 1, key,
391 GFP_KERNEL | __GFP_ZERO))
392 BUG();
393 p->role_val_to_struct[role->value - 1] = role;
394 return 0;
395}
396
397static int type_index(void *key, void *datum, void *datap)
398{
399 struct policydb *p;
400 struct type_datum *typdatum;
401 struct flex_array *fa;
402
403 typdatum = datum;
404 p = datap;
405
406 if (typdatum->primary) {
407 if (!typdatum->value
408 || typdatum->value > p->p_types.nprim
409 || typdatum->bounds > p->p_types.nprim)
410 return -EINVAL;
411 fa = p->sym_val_to_name[SYM_TYPES];
412 if (flex_array_put_ptr(fa, typdatum->value - 1, key,
413 GFP_KERNEL | __GFP_ZERO))
414 BUG();
415
416 fa = p->type_val_to_struct_array;
417 if (flex_array_put_ptr(fa, typdatum->value - 1, typdatum,
418 GFP_KERNEL | __GFP_ZERO))
419 BUG();
420 }
421
422 return 0;
423}
424
425static int user_index(void *key, void *datum, void *datap)
426{
427 struct policydb *p;
428 struct user_datum *usrdatum;
429 struct flex_array *fa;
430
431 usrdatum = datum;
432 p = datap;
433 if (!usrdatum->value
434 || usrdatum->value > p->p_users.nprim
435 || usrdatum->bounds > p->p_users.nprim)
436 return -EINVAL;
437
438 fa = p->sym_val_to_name[SYM_USERS];
439 if (flex_array_put_ptr(fa, usrdatum->value - 1, key,
440 GFP_KERNEL | __GFP_ZERO))
441 BUG();
442 p->user_val_to_struct[usrdatum->value - 1] = usrdatum;
443 return 0;
444}
445
446static int sens_index(void *key, void *datum, void *datap)
447{
448 struct policydb *p;
449 struct level_datum *levdatum;
450 struct flex_array *fa;
451
452 levdatum = datum;
453 p = datap;
454
455 if (!levdatum->isalias) {
456 if (!levdatum->level->sens ||
457 levdatum->level->sens > p->p_levels.nprim)
458 return -EINVAL;
459 fa = p->sym_val_to_name[SYM_LEVELS];
460 if (flex_array_put_ptr(fa, levdatum->level->sens - 1, key,
461 GFP_KERNEL | __GFP_ZERO))
462 BUG();
463 }
464
465 return 0;
466}
467
468static int cat_index(void *key, void *datum, void *datap)
469{
470 struct policydb *p;
471 struct cat_datum *catdatum;
472 struct flex_array *fa;
473
474 catdatum = datum;
475 p = datap;
476
477 if (!catdatum->isalias) {
478 if (!catdatum->value || catdatum->value > p->p_cats.nprim)
479 return -EINVAL;
480 fa = p->sym_val_to_name[SYM_CATS];
481 if (flex_array_put_ptr(fa, catdatum->value - 1, key,
482 GFP_KERNEL | __GFP_ZERO))
483 BUG();
484 }
485
486 return 0;
487}
488
489static int (*index_f[SYM_NUM]) (void *key, void *datum, void *datap) =
490{
491 common_index,
492 class_index,
493 role_index,
494 type_index,
495 user_index,
496 cond_index_bool,
497 sens_index,
498 cat_index,
499};
500
501#ifdef DEBUG_HASHES
502static void hash_eval(struct hashtab *h, const char *hash_name)
503{
504 struct hashtab_info info;
505
506 hashtab_stat(h, &info);
507 printk(KERN_DEBUG "SELinux: %s: %d entries and %d/%d buckets used, "
508 "longest chain length %d\n", hash_name, h->nel,
509 info.slots_used, h->size, info.max_chain_len);
510}
511
512static void symtab_hash_eval(struct symtab *s)
513{
514 int i;
515
516 for (i = 0; i < SYM_NUM; i++)
517 hash_eval(s[i].table, symtab_name[i]);
518}
519
520#else
521static inline void hash_eval(struct hashtab *h, char *hash_name)
522{
523}
524#endif
525
526/*
527 * Define the other val_to_name and val_to_struct arrays
528 * in a policy database structure.
529 *
530 * Caller must clean up on failure.
531 */
532static int policydb_index(struct policydb *p)
533{
534 int i, rc;
535
536 printk(KERN_DEBUG "SELinux: %d users, %d roles, %d types, %d bools",
537 p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim, p->p_bools.nprim);
538 if (p->mls_enabled)
539 printk(KERN_CONT ", %d sens, %d cats", p->p_levels.nprim,
540 p->p_cats.nprim);
541 printk(KERN_CONT "\n");
542
543 printk(KERN_DEBUG "SELinux: %d classes, %d rules\n",
544 p->p_classes.nprim, p->te_avtab.nel);
545
546#ifdef DEBUG_HASHES
547 avtab_hash_eval(&p->te_avtab, "rules");
548 symtab_hash_eval(p->symtab);
549#endif
550
551 p->class_val_to_struct = kcalloc(p->p_classes.nprim,
552 sizeof(*p->class_val_to_struct),
553 GFP_KERNEL);
554 if (!p->class_val_to_struct)
555 return -ENOMEM;
556
557 p->role_val_to_struct = kcalloc(p->p_roles.nprim,
558 sizeof(*p->role_val_to_struct),
559 GFP_KERNEL);
560 if (!p->role_val_to_struct)
561 return -ENOMEM;
562
563 p->user_val_to_struct = kcalloc(p->p_users.nprim,
564 sizeof(*p->user_val_to_struct),
565 GFP_KERNEL);
566 if (!p->user_val_to_struct)
567 return -ENOMEM;
568
569 /* Yes, I want the sizeof the pointer, not the structure */
570 p->type_val_to_struct_array = flex_array_alloc(sizeof(struct type_datum *),
571 p->p_types.nprim,
572 GFP_KERNEL | __GFP_ZERO);
573 if (!p->type_val_to_struct_array)
574 return -ENOMEM;
575
576 rc = flex_array_prealloc(p->type_val_to_struct_array, 0,
577 p->p_types.nprim, GFP_KERNEL | __GFP_ZERO);
578 if (rc)
579 goto out;
580
581 rc = cond_init_bool_indexes(p);
582 if (rc)
583 goto out;
584
585 for (i = 0; i < SYM_NUM; i++) {
586 p->sym_val_to_name[i] = flex_array_alloc(sizeof(char *),
587 p->symtab[i].nprim,
588 GFP_KERNEL | __GFP_ZERO);
589 if (!p->sym_val_to_name[i])
590 return -ENOMEM;
591
592 rc = flex_array_prealloc(p->sym_val_to_name[i],
593 0, p->symtab[i].nprim,
594 GFP_KERNEL | __GFP_ZERO);
595 if (rc)
596 goto out;
597
598 rc = hashtab_map(p->symtab[i].table, index_f[i], p);
599 if (rc)
600 goto out;
601 }
602 rc = 0;
603out:
604 return rc;
605}
606
607/*
608 * The following *_destroy functions are used to
609 * free any memory allocated for each kind of
610 * symbol data in the policy database.
611 */
612
613static int perm_destroy(void *key, void *datum, void *p)
614{
615 kfree(key);
616 kfree(datum);
617 return 0;
618}
619
620static int common_destroy(void *key, void *datum, void *p)
621{
622 struct common_datum *comdatum;
623
624 kfree(key);
625 if (datum) {
626 comdatum = datum;
627 hashtab_map(comdatum->permissions.table, perm_destroy, NULL);
628 hashtab_destroy(comdatum->permissions.table);
629 }
630 kfree(datum);
631 return 0;
632}
633
634static void constraint_expr_destroy(struct constraint_expr *expr)
635{
636 if (expr) {
637 ebitmap_destroy(&expr->names);
638 if (expr->type_names) {
639 ebitmap_destroy(&expr->type_names->types);
640 ebitmap_destroy(&expr->type_names->negset);
641 kfree(expr->type_names);
642 }
643 kfree(expr);
644 }
645}
646
647static int cls_destroy(void *key, void *datum, void *p)
648{
649 struct class_datum *cladatum;
650 struct constraint_node *constraint, *ctemp;
651 struct constraint_expr *e, *etmp;
652
653 kfree(key);
654 if (datum) {
655 cladatum = datum;
656 hashtab_map(cladatum->permissions.table, perm_destroy, NULL);
657 hashtab_destroy(cladatum->permissions.table);
658 constraint = cladatum->constraints;
659 while (constraint) {
660 e = constraint->expr;
661 while (e) {
662 etmp = e;
663 e = e->next;
664 constraint_expr_destroy(etmp);
665 }
666 ctemp = constraint;
667 constraint = constraint->next;
668 kfree(ctemp);
669 }
670
671 constraint = cladatum->validatetrans;
672 while (constraint) {
673 e = constraint->expr;
674 while (e) {
675 etmp = e;
676 e = e->next;
677 constraint_expr_destroy(etmp);
678 }
679 ctemp = constraint;
680 constraint = constraint->next;
681 kfree(ctemp);
682 }
683 kfree(cladatum->comkey);
684 }
685 kfree(datum);
686 return 0;
687}
688
689static int role_destroy(void *key, void *datum, void *p)
690{
691 struct role_datum *role;
692
693 kfree(key);
694 if (datum) {
695 role = datum;
696 ebitmap_destroy(&role->dominates);
697 ebitmap_destroy(&role->types);
698 }
699 kfree(datum);
700 return 0;
701}
702
703static int type_destroy(void *key, void *datum, void *p)
704{
705 kfree(key);
706 kfree(datum);
707 return 0;
708}
709
710static int user_destroy(void *key, void *datum, void *p)
711{
712 struct user_datum *usrdatum;
713
714 kfree(key);
715 if (datum) {
716 usrdatum = datum;
717 ebitmap_destroy(&usrdatum->roles);
718 ebitmap_destroy(&usrdatum->range.level[0].cat);
719 ebitmap_destroy(&usrdatum->range.level[1].cat);
720 ebitmap_destroy(&usrdatum->dfltlevel.cat);
721 }
722 kfree(datum);
723 return 0;
724}
725
726static int sens_destroy(void *key, void *datum, void *p)
727{
728 struct level_datum *levdatum;
729
730 kfree(key);
731 if (datum) {
732 levdatum = datum;
733 ebitmap_destroy(&levdatum->level->cat);
734 kfree(levdatum->level);
735 }
736 kfree(datum);
737 return 0;
738}
739
740static int cat_destroy(void *key, void *datum, void *p)
741{
742 kfree(key);
743 kfree(datum);
744 return 0;
745}
746
747static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) =
748{
749 common_destroy,
750 cls_destroy,
751 role_destroy,
752 type_destroy,
753 user_destroy,
754 cond_destroy_bool,
755 sens_destroy,
756 cat_destroy,
757};
758
759static int filenametr_destroy(void *key, void *datum, void *p)
760{
761 struct filename_trans *ft = key;
762 kfree(ft->name);
763 kfree(key);
764 kfree(datum);
765 cond_resched();
766 return 0;
767}
768
769static int range_tr_destroy(void *key, void *datum, void *p)
770{
771 struct mls_range *rt = datum;
772 kfree(key);
773 ebitmap_destroy(&rt->level[0].cat);
774 ebitmap_destroy(&rt->level[1].cat);
775 kfree(datum);
776 cond_resched();
777 return 0;
778}
779
780static void ocontext_destroy(struct ocontext *c, int i)
781{
782 if (!c)
783 return;
784
785 context_destroy(&c->context[0]);
786 context_destroy(&c->context[1]);
787 if (i == OCON_ISID || i == OCON_FS ||
788 i == OCON_NETIF || i == OCON_FSUSE)
789 kfree(c->u.name);
790 kfree(c);
791}
792
793/*
794 * Free any memory allocated by a policy database structure.
795 */
796void policydb_destroy(struct policydb *p)
797{
798 struct ocontext *c, *ctmp;
799 struct genfs *g, *gtmp;
800 int i;
801 struct role_allow *ra, *lra = NULL;
802 struct role_trans *tr, *ltr = NULL;
803
804 for (i = 0; i < SYM_NUM; i++) {
805 cond_resched();
806 hashtab_map(p->symtab[i].table, destroy_f[i], NULL);
807 hashtab_destroy(p->symtab[i].table);
808 }
809
810 for (i = 0; i < SYM_NUM; i++) {
811 if (p->sym_val_to_name[i])
812 flex_array_free(p->sym_val_to_name[i]);
813 }
814
815 kfree(p->class_val_to_struct);
816 kfree(p->role_val_to_struct);
817 kfree(p->user_val_to_struct);
818 if (p->type_val_to_struct_array)
819 flex_array_free(p->type_val_to_struct_array);
820
821 avtab_destroy(&p->te_avtab);
822
823 for (i = 0; i < OCON_NUM; i++) {
824 cond_resched();
825 c = p->ocontexts[i];
826 while (c) {
827 ctmp = c;
828 c = c->next;
829 ocontext_destroy(ctmp, i);
830 }
831 p->ocontexts[i] = NULL;
832 }
833
834 g = p->genfs;
835 while (g) {
836 cond_resched();
837 kfree(g->fstype);
838 c = g->head;
839 while (c) {
840 ctmp = c;
841 c = c->next;
842 ocontext_destroy(ctmp, OCON_FSUSE);
843 }
844 gtmp = g;
845 g = g->next;
846 kfree(gtmp);
847 }
848 p->genfs = NULL;
849
850 cond_policydb_destroy(p);
851
852 for (tr = p->role_tr; tr; tr = tr->next) {
853 cond_resched();
854 kfree(ltr);
855 ltr = tr;
856 }
857 kfree(ltr);
858
859 for (ra = p->role_allow; ra; ra = ra->next) {
860 cond_resched();
861 kfree(lra);
862 lra = ra;
863 }
864 kfree(lra);
865
866 hashtab_map(p->filename_trans, filenametr_destroy, NULL);
867 hashtab_destroy(p->filename_trans);
868
869 hashtab_map(p->range_tr, range_tr_destroy, NULL);
870 hashtab_destroy(p->range_tr);
871
872 if (p->type_attr_map_array) {
873 for (i = 0; i < p->p_types.nprim; i++) {
874 struct ebitmap *e;
875
876 e = flex_array_get(p->type_attr_map_array, i);
877 if (!e)
878 continue;
879 ebitmap_destroy(e);
880 }
881 flex_array_free(p->type_attr_map_array);
882 }
883
884 ebitmap_destroy(&p->filename_trans_ttypes);
885 ebitmap_destroy(&p->policycaps);
886 ebitmap_destroy(&p->permissive_map);
887}
888
889/*
890 * Load the initial SIDs specified in a policy database
891 * structure into a SID table.
892 */
893int policydb_load_isids(struct policydb *p, struct sidtab *s)
894{
895 struct ocontext *head, *c;
896 int rc;
897
898 rc = sidtab_init(s);
899 if (rc) {
900 printk(KERN_ERR "SELinux: out of memory on SID table init\n");
901 goto out;
902 }
903
904 head = p->ocontexts[OCON_ISID];
905 for (c = head; c; c = c->next) {
906 rc = -EINVAL;
907 if (!c->context[0].user) {
908 printk(KERN_ERR "SELinux: SID %s was never defined.\n",
909 c->u.name);
910 goto out;
911 }
912
913 rc = sidtab_insert(s, c->sid[0], &c->context[0]);
914 if (rc) {
915 printk(KERN_ERR "SELinux: unable to load initial SID %s.\n",
916 c->u.name);
917 goto out;
918 }
919 }
920 rc = 0;
921out:
922 return rc;
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 printk(KERN_ERR "SELinux: mls: range overflow\n");
1009 goto out;
1010 }
1011
1012 rc = next_entry(buf, fp, sizeof(u32) * items);
1013 if (rc) {
1014 printk(KERN_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 printk(KERN_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 printk(KERN_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 printk(KERN_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,
1055 struct policydb *p,
1056 void *fp)
1057{
1058 __le32 buf[3];
1059 int rc;
1060
1061 rc = next_entry(buf, fp, sizeof buf);
1062 if (rc) {
1063 printk(KERN_ERR "SELinux: context truncated\n");
1064 goto out;
1065 }
1066 c->user = le32_to_cpu(buf[0]);
1067 c->role = le32_to_cpu(buf[1]);
1068 c->type = le32_to_cpu(buf[2]);
1069 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1070 rc = mls_read_range_helper(&c->range, fp);
1071 if (rc) {
1072 printk(KERN_ERR "SELinux: error reading MLS range of context\n");
1073 goto out;
1074 }
1075 }
1076
1077 rc = -EINVAL;
1078 if (!policydb_context_isvalid(p, c)) {
1079 printk(KERN_ERR "SELinux: invalid security context\n");
1080 context_destroy(c);
1081 goto out;
1082 }
1083 rc = 0;
1084out:
1085 return rc;
1086}
1087
1088/*
1089 * The following *_read functions are used to
1090 * read the symbol data from a policy database
1091 * binary representation file.
1092 */
1093
1094static int str_read(char **strp, gfp_t flags, void *fp, u32 len)
1095{
1096 int rc;
1097 char *str;
1098
1099 if ((len == 0) || (len == (u32)-1))
1100 return -EINVAL;
1101
1102 str = kmalloc(len + 1, flags);
1103 if (!str)
1104 return -ENOMEM;
1105
1106 /* it's expected the caller should free the str */
1107 *strp = str;
1108
1109 rc = next_entry(str, fp, len);
1110 if (rc)
1111 return rc;
1112
1113 str[len] = '\0';
1114 return 0;
1115}
1116
1117static int perm_read(struct policydb *p, struct hashtab *h, void *fp)
1118{
1119 char *key = NULL;
1120 struct perm_datum *perdatum;
1121 int rc;
1122 __le32 buf[2];
1123 u32 len;
1124
1125 perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
1126 if (!perdatum)
1127 return -ENOMEM;
1128
1129 rc = next_entry(buf, fp, sizeof buf);
1130 if (rc)
1131 goto bad;
1132
1133 len = le32_to_cpu(buf[0]);
1134 perdatum->value = le32_to_cpu(buf[1]);
1135
1136 rc = str_read(&key, GFP_KERNEL, fp, len);
1137 if (rc)
1138 goto bad;
1139
1140 rc = hashtab_insert(h, key, perdatum);
1141 if (rc)
1142 goto bad;
1143
1144 return 0;
1145bad:
1146 perm_destroy(key, perdatum, NULL);
1147 return rc;
1148}
1149
1150static int common_read(struct policydb *p, struct hashtab *h, void *fp)
1151{
1152 char *key = NULL;
1153 struct common_datum *comdatum;
1154 __le32 buf[4];
1155 u32 len, nel;
1156 int i, rc;
1157
1158 comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
1159 if (!comdatum)
1160 return -ENOMEM;
1161
1162 rc = next_entry(buf, fp, sizeof buf);
1163 if (rc)
1164 goto bad;
1165
1166 len = le32_to_cpu(buf[0]);
1167 comdatum->value = le32_to_cpu(buf[1]);
1168
1169 rc = symtab_init(&comdatum->permissions, PERM_SYMTAB_SIZE);
1170 if (rc)
1171 goto bad;
1172 comdatum->permissions.nprim = le32_to_cpu(buf[2]);
1173 nel = le32_to_cpu(buf[3]);
1174
1175 rc = str_read(&key, GFP_KERNEL, fp, len);
1176 if (rc)
1177 goto bad;
1178
1179 for (i = 0; i < nel; i++) {
1180 rc = perm_read(p, comdatum->permissions.table, fp);
1181 if (rc)
1182 goto bad;
1183 }
1184
1185 rc = hashtab_insert(h, key, comdatum);
1186 if (rc)
1187 goto bad;
1188 return 0;
1189bad:
1190 common_destroy(key, comdatum, NULL);
1191 return rc;
1192}
1193
1194static void type_set_init(struct type_set *t)
1195{
1196 ebitmap_init(&t->types);
1197 ebitmap_init(&t->negset);
1198}
1199
1200static int type_set_read(struct type_set *t, void *fp)
1201{
1202 __le32 buf[1];
1203 int rc;
1204
1205 if (ebitmap_read(&t->types, fp))
1206 return -EINVAL;
1207 if (ebitmap_read(&t->negset, fp))
1208 return -EINVAL;
1209
1210 rc = next_entry(buf, fp, sizeof(u32));
1211 if (rc < 0)
1212 return -EINVAL;
1213 t->flags = le32_to_cpu(buf[0]);
1214
1215 return 0;
1216}
1217
1218
1219static int read_cons_helper(struct policydb *p,
1220 struct constraint_node **nodep,
1221 int ncons, int allowxtarget, void *fp)
1222{
1223 struct constraint_node *c, *lc;
1224 struct constraint_expr *e, *le;
1225 __le32 buf[3];
1226 u32 nexpr;
1227 int rc, i, j, depth;
1228
1229 lc = NULL;
1230 for (i = 0; i < ncons; i++) {
1231 c = kzalloc(sizeof(*c), GFP_KERNEL);
1232 if (!c)
1233 return -ENOMEM;
1234
1235 if (lc)
1236 lc->next = c;
1237 else
1238 *nodep = c;
1239
1240 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1241 if (rc)
1242 return rc;
1243 c->permissions = le32_to_cpu(buf[0]);
1244 nexpr = le32_to_cpu(buf[1]);
1245 le = NULL;
1246 depth = -1;
1247 for (j = 0; j < nexpr; j++) {
1248 e = kzalloc(sizeof(*e), GFP_KERNEL);
1249 if (!e)
1250 return -ENOMEM;
1251
1252 if (le)
1253 le->next = e;
1254 else
1255 c->expr = e;
1256
1257 rc = next_entry(buf, fp, (sizeof(u32) * 3));
1258 if (rc)
1259 return rc;
1260 e->expr_type = le32_to_cpu(buf[0]);
1261 e->attr = le32_to_cpu(buf[1]);
1262 e->op = le32_to_cpu(buf[2]);
1263
1264 switch (e->expr_type) {
1265 case CEXPR_NOT:
1266 if (depth < 0)
1267 return -EINVAL;
1268 break;
1269 case CEXPR_AND:
1270 case CEXPR_OR:
1271 if (depth < 1)
1272 return -EINVAL;
1273 depth--;
1274 break;
1275 case CEXPR_ATTR:
1276 if (depth == (CEXPR_MAXDEPTH - 1))
1277 return -EINVAL;
1278 depth++;
1279 break;
1280 case CEXPR_NAMES:
1281 if (!allowxtarget && (e->attr & CEXPR_XTARGET))
1282 return -EINVAL;
1283 if (depth == (CEXPR_MAXDEPTH - 1))
1284 return -EINVAL;
1285 depth++;
1286 rc = ebitmap_read(&e->names, fp);
1287 if (rc)
1288 return rc;
1289 if (p->policyvers >=
1290 POLICYDB_VERSION_CONSTRAINT_NAMES) {
1291 e->type_names = kzalloc(sizeof
1292 (*e->type_names),
1293 GFP_KERNEL);
1294 if (!e->type_names)
1295 return -ENOMEM;
1296 type_set_init(e->type_names);
1297 rc = type_set_read(e->type_names, fp);
1298 if (rc)
1299 return rc;
1300 }
1301 break;
1302 default:
1303 return -EINVAL;
1304 }
1305 le = e;
1306 }
1307 if (depth != 0)
1308 return -EINVAL;
1309 lc = c;
1310 }
1311
1312 return 0;
1313}
1314
1315static int class_read(struct policydb *p, struct hashtab *h, void *fp)
1316{
1317 char *key = NULL;
1318 struct class_datum *cladatum;
1319 __le32 buf[6];
1320 u32 len, len2, ncons, nel;
1321 int i, rc;
1322
1323 cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
1324 if (!cladatum)
1325 return -ENOMEM;
1326
1327 rc = next_entry(buf, fp, sizeof(u32)*6);
1328 if (rc)
1329 goto bad;
1330
1331 len = le32_to_cpu(buf[0]);
1332 len2 = le32_to_cpu(buf[1]);
1333 cladatum->value = le32_to_cpu(buf[2]);
1334
1335 rc = symtab_init(&cladatum->permissions, PERM_SYMTAB_SIZE);
1336 if (rc)
1337 goto bad;
1338 cladatum->permissions.nprim = le32_to_cpu(buf[3]);
1339 nel = le32_to_cpu(buf[4]);
1340
1341 ncons = le32_to_cpu(buf[5]);
1342
1343 rc = str_read(&key, GFP_KERNEL, fp, len);
1344 if (rc)
1345 goto bad;
1346
1347 if (len2) {
1348 rc = str_read(&cladatum->comkey, GFP_KERNEL, fp, len2);
1349 if (rc)
1350 goto bad;
1351
1352 rc = -EINVAL;
1353 cladatum->comdatum = hashtab_search(p->p_commons.table, cladatum->comkey);
1354 if (!cladatum->comdatum) {
1355 printk(KERN_ERR "SELinux: unknown common %s\n", cladatum->comkey);
1356 goto bad;
1357 }
1358 }
1359 for (i = 0; i < nel; i++) {
1360 rc = perm_read(p, cladatum->permissions.table, fp);
1361 if (rc)
1362 goto bad;
1363 }
1364
1365 rc = read_cons_helper(p, &cladatum->constraints, ncons, 0, fp);
1366 if (rc)
1367 goto bad;
1368
1369 if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
1370 /* grab the validatetrans rules */
1371 rc = next_entry(buf, fp, sizeof(u32));
1372 if (rc)
1373 goto bad;
1374 ncons = le32_to_cpu(buf[0]);
1375 rc = read_cons_helper(p, &cladatum->validatetrans,
1376 ncons, 1, fp);
1377 if (rc)
1378 goto bad;
1379 }
1380
1381 if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
1382 rc = next_entry(buf, fp, sizeof(u32) * 3);
1383 if (rc)
1384 goto bad;
1385
1386 cladatum->default_user = le32_to_cpu(buf[0]);
1387 cladatum->default_role = le32_to_cpu(buf[1]);
1388 cladatum->default_range = le32_to_cpu(buf[2]);
1389 }
1390
1391 if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
1392 rc = next_entry(buf, fp, sizeof(u32) * 1);
1393 if (rc)
1394 goto bad;
1395 cladatum->default_type = le32_to_cpu(buf[0]);
1396 }
1397
1398 rc = hashtab_insert(h, key, cladatum);
1399 if (rc)
1400 goto bad;
1401
1402 return 0;
1403bad:
1404 cls_destroy(key, cladatum, NULL);
1405 return rc;
1406}
1407
1408static int role_read(struct policydb *p, struct hashtab *h, void *fp)
1409{
1410 char *key = NULL;
1411 struct role_datum *role;
1412 int rc, to_read = 2;
1413 __le32 buf[3];
1414 u32 len;
1415
1416 role = kzalloc(sizeof(*role), GFP_KERNEL);
1417 if (!role)
1418 return -ENOMEM;
1419
1420 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1421 to_read = 3;
1422
1423 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1424 if (rc)
1425 goto bad;
1426
1427 len = le32_to_cpu(buf[0]);
1428 role->value = le32_to_cpu(buf[1]);
1429 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1430 role->bounds = le32_to_cpu(buf[2]);
1431
1432 rc = str_read(&key, GFP_KERNEL, fp, len);
1433 if (rc)
1434 goto bad;
1435
1436 rc = ebitmap_read(&role->dominates, fp);
1437 if (rc)
1438 goto bad;
1439
1440 rc = ebitmap_read(&role->types, fp);
1441 if (rc)
1442 goto bad;
1443
1444 if (strcmp(key, OBJECT_R) == 0) {
1445 rc = -EINVAL;
1446 if (role->value != OBJECT_R_VAL) {
1447 printk(KERN_ERR "SELinux: Role %s has wrong value %d\n",
1448 OBJECT_R, role->value);
1449 goto bad;
1450 }
1451 rc = 0;
1452 goto bad;
1453 }
1454
1455 rc = hashtab_insert(h, key, role);
1456 if (rc)
1457 goto bad;
1458 return 0;
1459bad:
1460 role_destroy(key, role, NULL);
1461 return rc;
1462}
1463
1464static int type_read(struct policydb *p, struct hashtab *h, void *fp)
1465{
1466 char *key = NULL;
1467 struct type_datum *typdatum;
1468 int rc, to_read = 3;
1469 __le32 buf[4];
1470 u32 len;
1471
1472 typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL);
1473 if (!typdatum)
1474 return -ENOMEM;
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 usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
1547 if (!usrdatum)
1548 return -ENOMEM;
1549
1550 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1551 to_read = 3;
1552
1553 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1554 if (rc)
1555 goto bad;
1556
1557 len = le32_to_cpu(buf[0]);
1558 usrdatum->value = le32_to_cpu(buf[1]);
1559 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1560 usrdatum->bounds = le32_to_cpu(buf[2]);
1561
1562 rc = str_read(&key, GFP_KERNEL, fp, len);
1563 if (rc)
1564 goto bad;
1565
1566 rc = ebitmap_read(&usrdatum->roles, fp);
1567 if (rc)
1568 goto bad;
1569
1570 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1571 rc = mls_read_range_helper(&usrdatum->range, fp);
1572 if (rc)
1573 goto bad;
1574 rc = mls_read_level(&usrdatum->dfltlevel, fp);
1575 if (rc)
1576 goto bad;
1577 }
1578
1579 rc = hashtab_insert(h, key, usrdatum);
1580 if (rc)
1581 goto bad;
1582 return 0;
1583bad:
1584 user_destroy(key, usrdatum, NULL);
1585 return rc;
1586}
1587
1588static int sens_read(struct policydb *p, struct hashtab *h, void *fp)
1589{
1590 char *key = NULL;
1591 struct level_datum *levdatum;
1592 int rc;
1593 __le32 buf[2];
1594 u32 len;
1595
1596 levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC);
1597 if (!levdatum)
1598 return -ENOMEM;
1599
1600 rc = next_entry(buf, fp, sizeof buf);
1601 if (rc)
1602 goto bad;
1603
1604 len = le32_to_cpu(buf[0]);
1605 levdatum->isalias = le32_to_cpu(buf[1]);
1606
1607 rc = str_read(&key, GFP_ATOMIC, fp, len);
1608 if (rc)
1609 goto bad;
1610
1611 rc = -ENOMEM;
1612 levdatum->level = kmalloc(sizeof(*levdatum->level), GFP_ATOMIC);
1613 if (!levdatum->level)
1614 goto bad;
1615
1616 rc = mls_read_level(levdatum->level, fp);
1617 if (rc)
1618 goto bad;
1619
1620 rc = hashtab_insert(h, key, levdatum);
1621 if (rc)
1622 goto bad;
1623 return 0;
1624bad:
1625 sens_destroy(key, levdatum, NULL);
1626 return rc;
1627}
1628
1629static int cat_read(struct policydb *p, struct hashtab *h, void *fp)
1630{
1631 char *key = NULL;
1632 struct cat_datum *catdatum;
1633 int rc;
1634 __le32 buf[3];
1635 u32 len;
1636
1637 catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC);
1638 if (!catdatum)
1639 return -ENOMEM;
1640
1641 rc = next_entry(buf, fp, sizeof buf);
1642 if (rc)
1643 goto bad;
1644
1645 len = le32_to_cpu(buf[0]);
1646 catdatum->value = le32_to_cpu(buf[1]);
1647 catdatum->isalias = le32_to_cpu(buf[2]);
1648
1649 rc = str_read(&key, GFP_ATOMIC, fp, len);
1650 if (rc)
1651 goto bad;
1652
1653 rc = hashtab_insert(h, key, catdatum);
1654 if (rc)
1655 goto bad;
1656 return 0;
1657bad:
1658 cat_destroy(key, catdatum, NULL);
1659 return rc;
1660}
1661
1662static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, void *fp) =
1663{
1664 common_read,
1665 class_read,
1666 role_read,
1667 type_read,
1668 user_read,
1669 cond_read_bool,
1670 sens_read,
1671 cat_read,
1672};
1673
1674static int user_bounds_sanity_check(void *key, void *datum, void *datap)
1675{
1676 struct user_datum *upper, *user;
1677 struct policydb *p = datap;
1678 int depth = 0;
1679
1680 upper = user = datum;
1681 while (upper->bounds) {
1682 struct ebitmap_node *node;
1683 unsigned long bit;
1684
1685 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1686 printk(KERN_ERR "SELinux: user %s: "
1687 "too deep or looped boundary",
1688 (char *) key);
1689 return -EINVAL;
1690 }
1691
1692 upper = p->user_val_to_struct[upper->bounds - 1];
1693 ebitmap_for_each_positive_bit(&user->roles, node, bit) {
1694 if (ebitmap_get_bit(&upper->roles, bit))
1695 continue;
1696
1697 printk(KERN_ERR
1698 "SELinux: boundary violated policy: "
1699 "user=%s role=%s bounds=%s\n",
1700 sym_name(p, SYM_USERS, user->value - 1),
1701 sym_name(p, SYM_ROLES, bit),
1702 sym_name(p, SYM_USERS, upper->value - 1));
1703
1704 return -EINVAL;
1705 }
1706 }
1707
1708 return 0;
1709}
1710
1711static int role_bounds_sanity_check(void *key, void *datum, void *datap)
1712{
1713 struct role_datum *upper, *role;
1714 struct policydb *p = datap;
1715 int depth = 0;
1716
1717 upper = role = datum;
1718 while (upper->bounds) {
1719 struct ebitmap_node *node;
1720 unsigned long bit;
1721
1722 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1723 printk(KERN_ERR "SELinux: role %s: "
1724 "too deep or looped bounds\n",
1725 (char *) key);
1726 return -EINVAL;
1727 }
1728
1729 upper = p->role_val_to_struct[upper->bounds - 1];
1730 ebitmap_for_each_positive_bit(&role->types, node, bit) {
1731 if (ebitmap_get_bit(&upper->types, bit))
1732 continue;
1733
1734 printk(KERN_ERR
1735 "SELinux: boundary violated policy: "
1736 "role=%s type=%s bounds=%s\n",
1737 sym_name(p, SYM_ROLES, role->value - 1),
1738 sym_name(p, SYM_TYPES, bit),
1739 sym_name(p, SYM_ROLES, upper->value - 1));
1740
1741 return -EINVAL;
1742 }
1743 }
1744
1745 return 0;
1746}
1747
1748static int type_bounds_sanity_check(void *key, void *datum, void *datap)
1749{
1750 struct type_datum *upper;
1751 struct policydb *p = datap;
1752 int depth = 0;
1753
1754 upper = datum;
1755 while (upper->bounds) {
1756 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1757 printk(KERN_ERR "SELinux: type %s: "
1758 "too deep or looped boundary\n",
1759 (char *) key);
1760 return -EINVAL;
1761 }
1762
1763 upper = flex_array_get_ptr(p->type_val_to_struct_array,
1764 upper->bounds - 1);
1765 BUG_ON(!upper);
1766
1767 if (upper->attribute) {
1768 printk(KERN_ERR "SELinux: type %s: "
1769 "bounded by attribute %s",
1770 (char *) key,
1771 sym_name(p, SYM_TYPES, upper->value - 1));
1772 return -EINVAL;
1773 }
1774 }
1775
1776 return 0;
1777}
1778
1779static int policydb_bounds_sanity_check(struct policydb *p)
1780{
1781 int rc;
1782
1783 if (p->policyvers < POLICYDB_VERSION_BOUNDARY)
1784 return 0;
1785
1786 rc = hashtab_map(p->p_users.table,
1787 user_bounds_sanity_check, p);
1788 if (rc)
1789 return rc;
1790
1791 rc = hashtab_map(p->p_roles.table,
1792 role_bounds_sanity_check, p);
1793 if (rc)
1794 return rc;
1795
1796 rc = hashtab_map(p->p_types.table,
1797 type_bounds_sanity_check, p);
1798 if (rc)
1799 return rc;
1800
1801 return 0;
1802}
1803
1804u16 string_to_security_class(struct policydb *p, const char *name)
1805{
1806 struct class_datum *cladatum;
1807
1808 cladatum = hashtab_search(p->p_classes.table, name);
1809 if (!cladatum)
1810 return 0;
1811
1812 return cladatum->value;
1813}
1814
1815u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name)
1816{
1817 struct class_datum *cladatum;
1818 struct perm_datum *perdatum = NULL;
1819 struct common_datum *comdatum;
1820
1821 if (!tclass || tclass > p->p_classes.nprim)
1822 return 0;
1823
1824 cladatum = p->class_val_to_struct[tclass-1];
1825 comdatum = cladatum->comdatum;
1826 if (comdatum)
1827 perdatum = hashtab_search(comdatum->permissions.table,
1828 name);
1829 if (!perdatum)
1830 perdatum = hashtab_search(cladatum->permissions.table,
1831 name);
1832 if (!perdatum)
1833 return 0;
1834
1835 return 1U << (perdatum->value-1);
1836}
1837
1838static int range_read(struct policydb *p, void *fp)
1839{
1840 struct range_trans *rt = NULL;
1841 struct mls_range *r = NULL;
1842 int i, rc;
1843 __le32 buf[2];
1844 u32 nel;
1845
1846 if (p->policyvers < POLICYDB_VERSION_MLS)
1847 return 0;
1848
1849 rc = next_entry(buf, fp, sizeof(u32));
1850 if (rc)
1851 return rc;
1852
1853 nel = le32_to_cpu(buf[0]);
1854 for (i = 0; i < nel; i++) {
1855 rc = -ENOMEM;
1856 rt = kzalloc(sizeof(*rt), GFP_KERNEL);
1857 if (!rt)
1858 goto out;
1859
1860 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1861 if (rc)
1862 goto out;
1863
1864 rt->source_type = le32_to_cpu(buf[0]);
1865 rt->target_type = le32_to_cpu(buf[1]);
1866 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
1867 rc = next_entry(buf, fp, sizeof(u32));
1868 if (rc)
1869 goto out;
1870 rt->target_class = le32_to_cpu(buf[0]);
1871 } else
1872 rt->target_class = p->process_class;
1873
1874 rc = -EINVAL;
1875 if (!policydb_type_isvalid(p, rt->source_type) ||
1876 !policydb_type_isvalid(p, rt->target_type) ||
1877 !policydb_class_isvalid(p, rt->target_class))
1878 goto out;
1879
1880 rc = -ENOMEM;
1881 r = kzalloc(sizeof(*r), GFP_KERNEL);
1882 if (!r)
1883 goto out;
1884
1885 rc = mls_read_range_helper(r, fp);
1886 if (rc)
1887 goto out;
1888
1889 rc = -EINVAL;
1890 if (!mls_range_isvalid(p, r)) {
1891 printk(KERN_WARNING "SELinux: rangetrans: invalid range\n");
1892 goto out;
1893 }
1894
1895 rc = hashtab_insert(p->range_tr, rt, r);
1896 if (rc)
1897 goto out;
1898
1899 rt = NULL;
1900 r = NULL;
1901 }
1902 hash_eval(p->range_tr, "rangetr");
1903 rc = 0;
1904out:
1905 kfree(rt);
1906 kfree(r);
1907 return rc;
1908}
1909
1910static int filename_trans_read(struct policydb *p, void *fp)
1911{
1912 struct filename_trans *ft;
1913 struct filename_trans_datum *otype;
1914 char *name;
1915 u32 nel, len;
1916 __le32 buf[4];
1917 int rc, i;
1918
1919 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
1920 return 0;
1921
1922 rc = next_entry(buf, fp, sizeof(u32));
1923 if (rc)
1924 return rc;
1925 nel = le32_to_cpu(buf[0]);
1926
1927 for (i = 0; i < nel; i++) {
1928 otype = NULL;
1929 name = NULL;
1930
1931 rc = -ENOMEM;
1932 ft = kzalloc(sizeof(*ft), GFP_KERNEL);
1933 if (!ft)
1934 goto out;
1935
1936 rc = -ENOMEM;
1937 otype = kmalloc(sizeof(*otype), GFP_KERNEL);
1938 if (!otype)
1939 goto out;
1940
1941 /* length of the path component string */
1942 rc = next_entry(buf, fp, sizeof(u32));
1943 if (rc)
1944 goto out;
1945 len = le32_to_cpu(buf[0]);
1946
1947 /* path component string */
1948 rc = str_read(&name, GFP_KERNEL, fp, len);
1949 if (rc)
1950 goto out;
1951
1952 ft->name = name;
1953
1954 rc = next_entry(buf, fp, sizeof(u32) * 4);
1955 if (rc)
1956 goto out;
1957
1958 ft->stype = le32_to_cpu(buf[0]);
1959 ft->ttype = le32_to_cpu(buf[1]);
1960 ft->tclass = le32_to_cpu(buf[2]);
1961
1962 otype->otype = le32_to_cpu(buf[3]);
1963
1964 rc = ebitmap_set_bit(&p->filename_trans_ttypes, ft->ttype, 1);
1965 if (rc)
1966 goto out;
1967
1968 rc = hashtab_insert(p->filename_trans, ft, otype);
1969 if (rc) {
1970 /*
1971 * Do not return -EEXIST to the caller, or the system
1972 * will not boot.
1973 */
1974 if (rc != -EEXIST)
1975 goto out;
1976 /* But free memory to avoid memory leak. */
1977 kfree(ft);
1978 kfree(name);
1979 kfree(otype);
1980 }
1981 }
1982 hash_eval(p->filename_trans, "filenametr");
1983 return 0;
1984out:
1985 kfree(ft);
1986 kfree(name);
1987 kfree(otype);
1988
1989 return rc;
1990}
1991
1992static int genfs_read(struct policydb *p, void *fp)
1993{
1994 int i, j, rc;
1995 u32 nel, nel2, len, len2;
1996 __le32 buf[1];
1997 struct ocontext *l, *c;
1998 struct ocontext *newc = NULL;
1999 struct genfs *genfs_p, *genfs;
2000 struct genfs *newgenfs = NULL;
2001
2002 rc = next_entry(buf, fp, sizeof(u32));
2003 if (rc)
2004 return rc;
2005 nel = le32_to_cpu(buf[0]);
2006
2007 for (i = 0; i < nel; i++) {
2008 rc = next_entry(buf, fp, sizeof(u32));
2009 if (rc)
2010 goto out;
2011 len = le32_to_cpu(buf[0]);
2012
2013 rc = -ENOMEM;
2014 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
2015 if (!newgenfs)
2016 goto out;
2017
2018 rc = str_read(&newgenfs->fstype, GFP_KERNEL, fp, len);
2019 if (rc)
2020 goto out;
2021
2022 for (genfs_p = NULL, genfs = p->genfs; genfs;
2023 genfs_p = genfs, genfs = genfs->next) {
2024 rc = -EINVAL;
2025 if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
2026 printk(KERN_ERR "SELinux: dup genfs fstype %s\n",
2027 newgenfs->fstype);
2028 goto out;
2029 }
2030 if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
2031 break;
2032 }
2033 newgenfs->next = genfs;
2034 if (genfs_p)
2035 genfs_p->next = newgenfs;
2036 else
2037 p->genfs = newgenfs;
2038 genfs = newgenfs;
2039 newgenfs = NULL;
2040
2041 rc = next_entry(buf, fp, sizeof(u32));
2042 if (rc)
2043 goto out;
2044
2045 nel2 = le32_to_cpu(buf[0]);
2046 for (j = 0; j < nel2; j++) {
2047 rc = next_entry(buf, fp, sizeof(u32));
2048 if (rc)
2049 goto out;
2050 len = le32_to_cpu(buf[0]);
2051
2052 rc = -ENOMEM;
2053 newc = kzalloc(sizeof(*newc), GFP_KERNEL);
2054 if (!newc)
2055 goto out;
2056
2057 rc = str_read(&newc->u.name, GFP_KERNEL, fp, len);
2058 if (rc)
2059 goto out;
2060
2061 rc = next_entry(buf, fp, sizeof(u32));
2062 if (rc)
2063 goto out;
2064
2065 newc->v.sclass = le32_to_cpu(buf[0]);
2066 rc = context_read_and_validate(&newc->context[0], p, fp);
2067 if (rc)
2068 goto out;
2069
2070 for (l = NULL, c = genfs->head; c;
2071 l = c, c = c->next) {
2072 rc = -EINVAL;
2073 if (!strcmp(newc->u.name, c->u.name) &&
2074 (!c->v.sclass || !newc->v.sclass ||
2075 newc->v.sclass == c->v.sclass)) {
2076 printk(KERN_ERR "SELinux: dup genfs entry (%s,%s)\n",
2077 genfs->fstype, c->u.name);
2078 goto out;
2079 }
2080 len = strlen(newc->u.name);
2081 len2 = strlen(c->u.name);
2082 if (len > len2)
2083 break;
2084 }
2085
2086 newc->next = c;
2087 if (l)
2088 l->next = newc;
2089 else
2090 genfs->head = newc;
2091 newc = NULL;
2092 }
2093 }
2094 rc = 0;
2095out:
2096 if (newgenfs) {
2097 kfree(newgenfs->fstype);
2098 kfree(newgenfs);
2099 }
2100 ocontext_destroy(newc, OCON_FSUSE);
2101
2102 return rc;
2103}
2104
2105static int ocontext_read(struct policydb *p, struct policydb_compat_info *info,
2106 void *fp)
2107{
2108 int i, j, rc;
2109 u32 nel, len;
2110 __le32 buf[3];
2111 struct ocontext *l, *c;
2112 u32 nodebuf[8];
2113
2114 for (i = 0; i < info->ocon_num; i++) {
2115 rc = next_entry(buf, fp, sizeof(u32));
2116 if (rc)
2117 goto out;
2118 nel = le32_to_cpu(buf[0]);
2119
2120 l = NULL;
2121 for (j = 0; j < nel; j++) {
2122 rc = -ENOMEM;
2123 c = kzalloc(sizeof(*c), GFP_KERNEL);
2124 if (!c)
2125 goto out;
2126 if (l)
2127 l->next = c;
2128 else
2129 p->ocontexts[i] = c;
2130 l = c;
2131
2132 switch (i) {
2133 case OCON_ISID:
2134 rc = next_entry(buf, fp, sizeof(u32));
2135 if (rc)
2136 goto out;
2137
2138 c->sid[0] = le32_to_cpu(buf[0]);
2139 rc = context_read_and_validate(&c->context[0], p, fp);
2140 if (rc)
2141 goto out;
2142 break;
2143 case OCON_FS:
2144 case OCON_NETIF:
2145 rc = next_entry(buf, fp, sizeof(u32));
2146 if (rc)
2147 goto out;
2148 len = le32_to_cpu(buf[0]);
2149
2150 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2151 if (rc)
2152 goto out;
2153
2154 rc = context_read_and_validate(&c->context[0], p, fp);
2155 if (rc)
2156 goto out;
2157 rc = context_read_and_validate(&c->context[1], p, fp);
2158 if (rc)
2159 goto out;
2160 break;
2161 case OCON_PORT:
2162 rc = next_entry(buf, fp, sizeof(u32)*3);
2163 if (rc)
2164 goto out;
2165 c->u.port.protocol = le32_to_cpu(buf[0]);
2166 c->u.port.low_port = le32_to_cpu(buf[1]);
2167 c->u.port.high_port = le32_to_cpu(buf[2]);
2168 rc = context_read_and_validate(&c->context[0], p, fp);
2169 if (rc)
2170 goto out;
2171 break;
2172 case OCON_NODE:
2173 rc = next_entry(nodebuf, fp, sizeof(u32) * 2);
2174 if (rc)
2175 goto out;
2176 c->u.node.addr = nodebuf[0]; /* network order */
2177 c->u.node.mask = nodebuf[1]; /* network order */
2178 rc = context_read_and_validate(&c->context[0], p, fp);
2179 if (rc)
2180 goto out;
2181 break;
2182 case OCON_FSUSE:
2183 rc = next_entry(buf, fp, sizeof(u32)*2);
2184 if (rc)
2185 goto out;
2186
2187 rc = -EINVAL;
2188 c->v.behavior = le32_to_cpu(buf[0]);
2189 /* Determined at runtime, not in policy DB. */
2190 if (c->v.behavior == SECURITY_FS_USE_MNTPOINT)
2191 goto out;
2192 if (c->v.behavior > SECURITY_FS_USE_MAX)
2193 goto out;
2194
2195 len = le32_to_cpu(buf[1]);
2196 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2197 if (rc)
2198 goto out;
2199
2200 rc = context_read_and_validate(&c->context[0], p, fp);
2201 if (rc)
2202 goto out;
2203 break;
2204 case OCON_NODE6: {
2205 int k;
2206
2207 rc = next_entry(nodebuf, fp, sizeof(u32) * 8);
2208 if (rc)
2209 goto out;
2210 for (k = 0; k < 4; k++)
2211 c->u.node6.addr[k] = nodebuf[k];
2212 for (k = 0; k < 4; k++)
2213 c->u.node6.mask[k] = nodebuf[k+4];
2214 rc = context_read_and_validate(&c->context[0], p, fp);
2215 if (rc)
2216 goto out;
2217 break;
2218 }
2219 case OCON_IBPKEY:
2220 rc = next_entry(nodebuf, fp, sizeof(u32) * 4);
2221 if (rc)
2222 goto out;
2223
2224 c->u.ibpkey.subnet_prefix = be64_to_cpu(*((__be64 *)nodebuf));
2225
2226 if (nodebuf[2] > 0xffff ||
2227 nodebuf[3] > 0xffff) {
2228 rc = -EINVAL;
2229 goto out;
2230 }
2231
2232 c->u.ibpkey.low_pkey = le32_to_cpu(nodebuf[2]);
2233 c->u.ibpkey.high_pkey = le32_to_cpu(nodebuf[3]);
2234
2235 rc = context_read_and_validate(&c->context[0],
2236 p,
2237 fp);
2238 if (rc)
2239 goto out;
2240 break;
2241 case OCON_IBENDPORT:
2242 rc = next_entry(buf, fp, sizeof(u32) * 2);
2243 if (rc)
2244 goto out;
2245 len = le32_to_cpu(buf[0]);
2246
2247 rc = str_read(&c->u.ibendport.dev_name, GFP_KERNEL, fp, len);
2248 if (rc)
2249 goto out;
2250
2251 if (buf[1] > 0xff || buf[1] == 0) {
2252 rc = -EINVAL;
2253 goto out;
2254 }
2255
2256 c->u.ibendport.port = le32_to_cpu(buf[1]);
2257
2258 rc = context_read_and_validate(&c->context[0],
2259 p,
2260 fp);
2261 if (rc)
2262 goto out;
2263 break;
2264 }
2265 }
2266 }
2267 rc = 0;
2268out:
2269 return rc;
2270}
2271
2272/*
2273 * Read the configuration data from a policy database binary
2274 * representation file into a policy database structure.
2275 */
2276int policydb_read(struct policydb *p, void *fp)
2277{
2278 struct role_allow *ra, *lra;
2279 struct role_trans *tr, *ltr;
2280 int i, j, rc;
2281 __le32 buf[4];
2282 u32 len, nprim, nel;
2283
2284 char *policydb_str;
2285 struct policydb_compat_info *info;
2286
2287 rc = policydb_init(p);
2288 if (rc)
2289 return rc;
2290
2291 /* Read the magic number and string length. */
2292 rc = next_entry(buf, fp, sizeof(u32) * 2);
2293 if (rc)
2294 goto bad;
2295
2296 rc = -EINVAL;
2297 if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
2298 printk(KERN_ERR "SELinux: policydb magic number 0x%x does "
2299 "not match expected magic number 0x%x\n",
2300 le32_to_cpu(buf[0]), POLICYDB_MAGIC);
2301 goto bad;
2302 }
2303
2304 rc = -EINVAL;
2305 len = le32_to_cpu(buf[1]);
2306 if (len != strlen(POLICYDB_STRING)) {
2307 printk(KERN_ERR "SELinux: policydb string length %d does not "
2308 "match expected length %zu\n",
2309 len, strlen(POLICYDB_STRING));
2310 goto bad;
2311 }
2312
2313 rc = -ENOMEM;
2314 policydb_str = kmalloc(len + 1, GFP_KERNEL);
2315 if (!policydb_str) {
2316 printk(KERN_ERR "SELinux: unable to allocate memory for policydb "
2317 "string of length %d\n", len);
2318 goto bad;
2319 }
2320
2321 rc = next_entry(policydb_str, fp, len);
2322 if (rc) {
2323 printk(KERN_ERR "SELinux: truncated policydb string identifier\n");
2324 kfree(policydb_str);
2325 goto bad;
2326 }
2327
2328 rc = -EINVAL;
2329 policydb_str[len] = '\0';
2330 if (strcmp(policydb_str, POLICYDB_STRING)) {
2331 printk(KERN_ERR "SELinux: policydb string %s does not match "
2332 "my string %s\n", policydb_str, POLICYDB_STRING);
2333 kfree(policydb_str);
2334 goto bad;
2335 }
2336 /* Done with policydb_str. */
2337 kfree(policydb_str);
2338 policydb_str = NULL;
2339
2340 /* Read the version and table sizes. */
2341 rc = next_entry(buf, fp, sizeof(u32)*4);
2342 if (rc)
2343 goto bad;
2344
2345 rc = -EINVAL;
2346 p->policyvers = le32_to_cpu(buf[0]);
2347 if (p->policyvers < POLICYDB_VERSION_MIN ||
2348 p->policyvers > POLICYDB_VERSION_MAX) {
2349 printk(KERN_ERR "SELinux: policydb version %d does not match "
2350 "my version range %d-%d\n",
2351 le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
2352 goto bad;
2353 }
2354
2355 if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
2356 p->mls_enabled = 1;
2357
2358 rc = -EINVAL;
2359 if (p->policyvers < POLICYDB_VERSION_MLS) {
2360 printk(KERN_ERR "SELinux: security policydb version %d "
2361 "(MLS) not backwards compatible\n",
2362 p->policyvers);
2363 goto bad;
2364 }
2365 }
2366 p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
2367 p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
2368
2369 if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
2370 rc = ebitmap_read(&p->policycaps, fp);
2371 if (rc)
2372 goto bad;
2373 }
2374
2375 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
2376 rc = ebitmap_read(&p->permissive_map, fp);
2377 if (rc)
2378 goto bad;
2379 }
2380
2381 rc = -EINVAL;
2382 info = policydb_lookup_compat(p->policyvers);
2383 if (!info) {
2384 printk(KERN_ERR "SELinux: unable to find policy compat info "
2385 "for version %d\n", p->policyvers);
2386 goto bad;
2387 }
2388
2389 rc = -EINVAL;
2390 if (le32_to_cpu(buf[2]) != info->sym_num ||
2391 le32_to_cpu(buf[3]) != info->ocon_num) {
2392 printk(KERN_ERR "SELinux: policydb table sizes (%d,%d) do "
2393 "not match mine (%d,%d)\n", le32_to_cpu(buf[2]),
2394 le32_to_cpu(buf[3]),
2395 info->sym_num, info->ocon_num);
2396 goto bad;
2397 }
2398
2399 for (i = 0; i < info->sym_num; i++) {
2400 rc = next_entry(buf, fp, sizeof(u32)*2);
2401 if (rc)
2402 goto bad;
2403 nprim = le32_to_cpu(buf[0]);
2404 nel = le32_to_cpu(buf[1]);
2405 for (j = 0; j < nel; j++) {
2406 rc = read_f[i](p, p->symtab[i].table, fp);
2407 if (rc)
2408 goto bad;
2409 }
2410
2411 p->symtab[i].nprim = nprim;
2412 }
2413
2414 rc = -EINVAL;
2415 p->process_class = string_to_security_class(p, "process");
2416 if (!p->process_class)
2417 goto bad;
2418
2419 rc = avtab_read(&p->te_avtab, fp, p);
2420 if (rc)
2421 goto bad;
2422
2423 if (p->policyvers >= POLICYDB_VERSION_BOOL) {
2424 rc = cond_read_list(p, fp);
2425 if (rc)
2426 goto bad;
2427 }
2428
2429 rc = next_entry(buf, fp, sizeof(u32));
2430 if (rc)
2431 goto bad;
2432 nel = le32_to_cpu(buf[0]);
2433 ltr = NULL;
2434 for (i = 0; i < nel; i++) {
2435 rc = -ENOMEM;
2436 tr = kzalloc(sizeof(*tr), GFP_KERNEL);
2437 if (!tr)
2438 goto bad;
2439 if (ltr)
2440 ltr->next = tr;
2441 else
2442 p->role_tr = tr;
2443 rc = next_entry(buf, fp, sizeof(u32)*3);
2444 if (rc)
2445 goto bad;
2446
2447 rc = -EINVAL;
2448 tr->role = le32_to_cpu(buf[0]);
2449 tr->type = le32_to_cpu(buf[1]);
2450 tr->new_role = le32_to_cpu(buf[2]);
2451 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2452 rc = next_entry(buf, fp, sizeof(u32));
2453 if (rc)
2454 goto bad;
2455 tr->tclass = le32_to_cpu(buf[0]);
2456 } else
2457 tr->tclass = p->process_class;
2458
2459 rc = -EINVAL;
2460 if (!policydb_role_isvalid(p, tr->role) ||
2461 !policydb_type_isvalid(p, tr->type) ||
2462 !policydb_class_isvalid(p, tr->tclass) ||
2463 !policydb_role_isvalid(p, tr->new_role))
2464 goto bad;
2465 ltr = tr;
2466 }
2467
2468 rc = next_entry(buf, fp, sizeof(u32));
2469 if (rc)
2470 goto bad;
2471 nel = le32_to_cpu(buf[0]);
2472 lra = NULL;
2473 for (i = 0; i < nel; i++) {
2474 rc = -ENOMEM;
2475 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
2476 if (!ra)
2477 goto bad;
2478 if (lra)
2479 lra->next = ra;
2480 else
2481 p->role_allow = ra;
2482 rc = next_entry(buf, fp, sizeof(u32)*2);
2483 if (rc)
2484 goto bad;
2485
2486 rc = -EINVAL;
2487 ra->role = le32_to_cpu(buf[0]);
2488 ra->new_role = le32_to_cpu(buf[1]);
2489 if (!policydb_role_isvalid(p, ra->role) ||
2490 !policydb_role_isvalid(p, ra->new_role))
2491 goto bad;
2492 lra = ra;
2493 }
2494
2495 rc = filename_trans_read(p, fp);
2496 if (rc)
2497 goto bad;
2498
2499 rc = policydb_index(p);
2500 if (rc)
2501 goto bad;
2502
2503 rc = -EINVAL;
2504 p->process_trans_perms = string_to_av_perm(p, p->process_class, "transition");
2505 p->process_trans_perms |= string_to_av_perm(p, p->process_class, "dyntransition");
2506 if (!p->process_trans_perms)
2507 goto bad;
2508
2509 rc = ocontext_read(p, info, fp);
2510 if (rc)
2511 goto bad;
2512
2513 rc = genfs_read(p, fp);
2514 if (rc)
2515 goto bad;
2516
2517 rc = range_read(p, fp);
2518 if (rc)
2519 goto bad;
2520
2521 rc = -ENOMEM;
2522 p->type_attr_map_array = flex_array_alloc(sizeof(struct ebitmap),
2523 p->p_types.nprim,
2524 GFP_KERNEL | __GFP_ZERO);
2525 if (!p->type_attr_map_array)
2526 goto bad;
2527
2528 /* preallocate so we don't have to worry about the put ever failing */
2529 rc = flex_array_prealloc(p->type_attr_map_array, 0, p->p_types.nprim,
2530 GFP_KERNEL | __GFP_ZERO);
2531 if (rc)
2532 goto bad;
2533
2534 for (i = 0; i < p->p_types.nprim; i++) {
2535 struct ebitmap *e = flex_array_get(p->type_attr_map_array, i);
2536
2537 BUG_ON(!e);
2538 ebitmap_init(e);
2539 if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
2540 rc = ebitmap_read(e, fp);
2541 if (rc)
2542 goto bad;
2543 }
2544 /* add the type itself as the degenerate case */
2545 rc = ebitmap_set_bit(e, i, 1);
2546 if (rc)
2547 goto bad;
2548 }
2549
2550 rc = policydb_bounds_sanity_check(p);
2551 if (rc)
2552 goto bad;
2553
2554 rc = 0;
2555out:
2556 return rc;
2557bad:
2558 policydb_destroy(p);
2559 goto out;
2560}
2561
2562/*
2563 * Write a MLS level structure to a policydb binary
2564 * representation file.
2565 */
2566static int mls_write_level(struct mls_level *l, void *fp)
2567{
2568 __le32 buf[1];
2569 int rc;
2570
2571 buf[0] = cpu_to_le32(l->sens);
2572 rc = put_entry(buf, sizeof(u32), 1, fp);
2573 if (rc)
2574 return rc;
2575
2576 rc = ebitmap_write(&l->cat, fp);
2577 if (rc)
2578 return rc;
2579
2580 return 0;
2581}
2582
2583/*
2584 * Write a MLS range structure to a policydb binary
2585 * representation file.
2586 */
2587static int mls_write_range_helper(struct mls_range *r, void *fp)
2588{
2589 __le32 buf[3];
2590 size_t items;
2591 int rc, eq;
2592
2593 eq = mls_level_eq(&r->level[1], &r->level[0]);
2594
2595 if (eq)
2596 items = 2;
2597 else
2598 items = 3;
2599 buf[0] = cpu_to_le32(items-1);
2600 buf[1] = cpu_to_le32(r->level[0].sens);
2601 if (!eq)
2602 buf[2] = cpu_to_le32(r->level[1].sens);
2603
2604 BUG_ON(items > ARRAY_SIZE(buf));
2605
2606 rc = put_entry(buf, sizeof(u32), items, fp);
2607 if (rc)
2608 return rc;
2609
2610 rc = ebitmap_write(&r->level[0].cat, fp);
2611 if (rc)
2612 return rc;
2613 if (!eq) {
2614 rc = ebitmap_write(&r->level[1].cat, fp);
2615 if (rc)
2616 return rc;
2617 }
2618
2619 return 0;
2620}
2621
2622static int sens_write(void *vkey, void *datum, void *ptr)
2623{
2624 char *key = vkey;
2625 struct level_datum *levdatum = datum;
2626 struct policy_data *pd = ptr;
2627 void *fp = pd->fp;
2628 __le32 buf[2];
2629 size_t len;
2630 int rc;
2631
2632 len = strlen(key);
2633 buf[0] = cpu_to_le32(len);
2634 buf[1] = cpu_to_le32(levdatum->isalias);
2635 rc = put_entry(buf, sizeof(u32), 2, fp);
2636 if (rc)
2637 return rc;
2638
2639 rc = put_entry(key, 1, len, fp);
2640 if (rc)
2641 return rc;
2642
2643 rc = mls_write_level(levdatum->level, fp);
2644 if (rc)
2645 return rc;
2646
2647 return 0;
2648}
2649
2650static int cat_write(void *vkey, void *datum, void *ptr)
2651{
2652 char *key = vkey;
2653 struct cat_datum *catdatum = datum;
2654 struct policy_data *pd = ptr;
2655 void *fp = pd->fp;
2656 __le32 buf[3];
2657 size_t len;
2658 int rc;
2659
2660 len = strlen(key);
2661 buf[0] = cpu_to_le32(len);
2662 buf[1] = cpu_to_le32(catdatum->value);
2663 buf[2] = cpu_to_le32(catdatum->isalias);
2664 rc = put_entry(buf, sizeof(u32), 3, fp);
2665 if (rc)
2666 return rc;
2667
2668 rc = put_entry(key, 1, len, fp);
2669 if (rc)
2670 return rc;
2671
2672 return 0;
2673}
2674
2675static int role_trans_write(struct policydb *p, void *fp)
2676{
2677 struct role_trans *r = p->role_tr;
2678 struct role_trans *tr;
2679 u32 buf[3];
2680 size_t nel;
2681 int rc;
2682
2683 nel = 0;
2684 for (tr = r; tr; tr = tr->next)
2685 nel++;
2686 buf[0] = cpu_to_le32(nel);
2687 rc = put_entry(buf, sizeof(u32), 1, fp);
2688 if (rc)
2689 return rc;
2690 for (tr = r; tr; tr = tr->next) {
2691 buf[0] = cpu_to_le32(tr->role);
2692 buf[1] = cpu_to_le32(tr->type);
2693 buf[2] = cpu_to_le32(tr->new_role);
2694 rc = put_entry(buf, sizeof(u32), 3, fp);
2695 if (rc)
2696 return rc;
2697 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2698 buf[0] = cpu_to_le32(tr->tclass);
2699 rc = put_entry(buf, sizeof(u32), 1, fp);
2700 if (rc)
2701 return rc;
2702 }
2703 }
2704
2705 return 0;
2706}
2707
2708static int role_allow_write(struct role_allow *r, void *fp)
2709{
2710 struct role_allow *ra;
2711 u32 buf[2];
2712 size_t nel;
2713 int rc;
2714
2715 nel = 0;
2716 for (ra = r; ra; ra = ra->next)
2717 nel++;
2718 buf[0] = cpu_to_le32(nel);
2719 rc = put_entry(buf, sizeof(u32), 1, fp);
2720 if (rc)
2721 return rc;
2722 for (ra = r; ra; ra = ra->next) {
2723 buf[0] = cpu_to_le32(ra->role);
2724 buf[1] = cpu_to_le32(ra->new_role);
2725 rc = put_entry(buf, sizeof(u32), 2, fp);
2726 if (rc)
2727 return rc;
2728 }
2729 return 0;
2730}
2731
2732/*
2733 * Write a security context structure
2734 * to a policydb binary representation file.
2735 */
2736static int context_write(struct policydb *p, struct context *c,
2737 void *fp)
2738{
2739 int rc;
2740 __le32 buf[3];
2741
2742 buf[0] = cpu_to_le32(c->user);
2743 buf[1] = cpu_to_le32(c->role);
2744 buf[2] = cpu_to_le32(c->type);
2745
2746 rc = put_entry(buf, sizeof(u32), 3, fp);
2747 if (rc)
2748 return rc;
2749
2750 rc = mls_write_range_helper(&c->range, fp);
2751 if (rc)
2752 return rc;
2753
2754 return 0;
2755}
2756
2757/*
2758 * The following *_write functions are used to
2759 * write the symbol data to a policy database
2760 * binary representation file.
2761 */
2762
2763static int perm_write(void *vkey, void *datum, void *fp)
2764{
2765 char *key = vkey;
2766 struct perm_datum *perdatum = datum;
2767 __le32 buf[2];
2768 size_t len;
2769 int rc;
2770
2771 len = strlen(key);
2772 buf[0] = cpu_to_le32(len);
2773 buf[1] = cpu_to_le32(perdatum->value);
2774 rc = put_entry(buf, sizeof(u32), 2, fp);
2775 if (rc)
2776 return rc;
2777
2778 rc = put_entry(key, 1, len, fp);
2779 if (rc)
2780 return rc;
2781
2782 return 0;
2783}
2784
2785static int common_write(void *vkey, void *datum, void *ptr)
2786{
2787 char *key = vkey;
2788 struct common_datum *comdatum = datum;
2789 struct policy_data *pd = ptr;
2790 void *fp = pd->fp;
2791 __le32 buf[4];
2792 size_t len;
2793 int rc;
2794
2795 len = strlen(key);
2796 buf[0] = cpu_to_le32(len);
2797 buf[1] = cpu_to_le32(comdatum->value);
2798 buf[2] = cpu_to_le32(comdatum->permissions.nprim);
2799 buf[3] = cpu_to_le32(comdatum->permissions.table->nel);
2800 rc = put_entry(buf, sizeof(u32), 4, fp);
2801 if (rc)
2802 return rc;
2803
2804 rc = put_entry(key, 1, len, fp);
2805 if (rc)
2806 return rc;
2807
2808 rc = hashtab_map(comdatum->permissions.table, perm_write, fp);
2809 if (rc)
2810 return rc;
2811
2812 return 0;
2813}
2814
2815static int type_set_write(struct type_set *t, void *fp)
2816{
2817 int rc;
2818 __le32 buf[1];
2819
2820 if (ebitmap_write(&t->types, fp))
2821 return -EINVAL;
2822 if (ebitmap_write(&t->negset, fp))
2823 return -EINVAL;
2824
2825 buf[0] = cpu_to_le32(t->flags);
2826 rc = put_entry(buf, sizeof(u32), 1, fp);
2827 if (rc)
2828 return -EINVAL;
2829
2830 return 0;
2831}
2832
2833static int write_cons_helper(struct policydb *p, struct constraint_node *node,
2834 void *fp)
2835{
2836 struct constraint_node *c;
2837 struct constraint_expr *e;
2838 __le32 buf[3];
2839 u32 nel;
2840 int rc;
2841
2842 for (c = node; c; c = c->next) {
2843 nel = 0;
2844 for (e = c->expr; e; e = e->next)
2845 nel++;
2846 buf[0] = cpu_to_le32(c->permissions);
2847 buf[1] = cpu_to_le32(nel);
2848 rc = put_entry(buf, sizeof(u32), 2, fp);
2849 if (rc)
2850 return rc;
2851 for (e = c->expr; e; e = e->next) {
2852 buf[0] = cpu_to_le32(e->expr_type);
2853 buf[1] = cpu_to_le32(e->attr);
2854 buf[2] = cpu_to_le32(e->op);
2855 rc = put_entry(buf, sizeof(u32), 3, fp);
2856 if (rc)
2857 return rc;
2858
2859 switch (e->expr_type) {
2860 case CEXPR_NAMES:
2861 rc = ebitmap_write(&e->names, fp);
2862 if (rc)
2863 return rc;
2864 if (p->policyvers >=
2865 POLICYDB_VERSION_CONSTRAINT_NAMES) {
2866 rc = type_set_write(e->type_names, fp);
2867 if (rc)
2868 return rc;
2869 }
2870 break;
2871 default:
2872 break;
2873 }
2874 }
2875 }
2876
2877 return 0;
2878}
2879
2880static int class_write(void *vkey, void *datum, void *ptr)
2881{
2882 char *key = vkey;
2883 struct class_datum *cladatum = datum;
2884 struct policy_data *pd = ptr;
2885 void *fp = pd->fp;
2886 struct policydb *p = pd->p;
2887 struct constraint_node *c;
2888 __le32 buf[6];
2889 u32 ncons;
2890 size_t len, len2;
2891 int rc;
2892
2893 len = strlen(key);
2894 if (cladatum->comkey)
2895 len2 = strlen(cladatum->comkey);
2896 else
2897 len2 = 0;
2898
2899 ncons = 0;
2900 for (c = cladatum->constraints; c; c = c->next)
2901 ncons++;
2902
2903 buf[0] = cpu_to_le32(len);
2904 buf[1] = cpu_to_le32(len2);
2905 buf[2] = cpu_to_le32(cladatum->value);
2906 buf[3] = cpu_to_le32(cladatum->permissions.nprim);
2907 if (cladatum->permissions.table)
2908 buf[4] = cpu_to_le32(cladatum->permissions.table->nel);
2909 else
2910 buf[4] = 0;
2911 buf[5] = cpu_to_le32(ncons);
2912 rc = put_entry(buf, sizeof(u32), 6, fp);
2913 if (rc)
2914 return rc;
2915
2916 rc = put_entry(key, 1, len, fp);
2917 if (rc)
2918 return rc;
2919
2920 if (cladatum->comkey) {
2921 rc = put_entry(cladatum->comkey, 1, len2, fp);
2922 if (rc)
2923 return rc;
2924 }
2925
2926 rc = hashtab_map(cladatum->permissions.table, perm_write, fp);
2927 if (rc)
2928 return rc;
2929
2930 rc = write_cons_helper(p, cladatum->constraints, fp);
2931 if (rc)
2932 return rc;
2933
2934 /* write out the validatetrans rule */
2935 ncons = 0;
2936 for (c = cladatum->validatetrans; c; c = c->next)
2937 ncons++;
2938
2939 buf[0] = cpu_to_le32(ncons);
2940 rc = put_entry(buf, sizeof(u32), 1, fp);
2941 if (rc)
2942 return rc;
2943
2944 rc = write_cons_helper(p, cladatum->validatetrans, fp);
2945 if (rc)
2946 return rc;
2947
2948 if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
2949 buf[0] = cpu_to_le32(cladatum->default_user);
2950 buf[1] = cpu_to_le32(cladatum->default_role);
2951 buf[2] = cpu_to_le32(cladatum->default_range);
2952
2953 rc = put_entry(buf, sizeof(uint32_t), 3, fp);
2954 if (rc)
2955 return rc;
2956 }
2957
2958 if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
2959 buf[0] = cpu_to_le32(cladatum->default_type);
2960 rc = put_entry(buf, sizeof(uint32_t), 1, fp);
2961 if (rc)
2962 return rc;
2963 }
2964
2965 return 0;
2966}
2967
2968static int role_write(void *vkey, void *datum, void *ptr)
2969{
2970 char *key = vkey;
2971 struct role_datum *role = datum;
2972 struct policy_data *pd = ptr;
2973 void *fp = pd->fp;
2974 struct policydb *p = pd->p;
2975 __le32 buf[3];
2976 size_t items, len;
2977 int rc;
2978
2979 len = strlen(key);
2980 items = 0;
2981 buf[items++] = cpu_to_le32(len);
2982 buf[items++] = cpu_to_le32(role->value);
2983 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
2984 buf[items++] = cpu_to_le32(role->bounds);
2985
2986 BUG_ON(items > ARRAY_SIZE(buf));
2987
2988 rc = put_entry(buf, sizeof(u32), items, fp);
2989 if (rc)
2990 return rc;
2991
2992 rc = put_entry(key, 1, len, fp);
2993 if (rc)
2994 return rc;
2995
2996 rc = ebitmap_write(&role->dominates, fp);
2997 if (rc)
2998 return rc;
2999
3000 rc = ebitmap_write(&role->types, fp);
3001 if (rc)
3002 return rc;
3003
3004 return 0;
3005}
3006
3007static int type_write(void *vkey, void *datum, void *ptr)
3008{
3009 char *key = vkey;
3010 struct type_datum *typdatum = datum;
3011 struct policy_data *pd = ptr;
3012 struct policydb *p = pd->p;
3013 void *fp = pd->fp;
3014 __le32 buf[4];
3015 int rc;
3016 size_t items, len;
3017
3018 len = strlen(key);
3019 items = 0;
3020 buf[items++] = cpu_to_le32(len);
3021 buf[items++] = cpu_to_le32(typdatum->value);
3022 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
3023 u32 properties = 0;
3024
3025 if (typdatum->primary)
3026 properties |= TYPEDATUM_PROPERTY_PRIMARY;
3027
3028 if (typdatum->attribute)
3029 properties |= TYPEDATUM_PROPERTY_ATTRIBUTE;
3030
3031 buf[items++] = cpu_to_le32(properties);
3032 buf[items++] = cpu_to_le32(typdatum->bounds);
3033 } else {
3034 buf[items++] = cpu_to_le32(typdatum->primary);
3035 }
3036 BUG_ON(items > ARRAY_SIZE(buf));
3037 rc = put_entry(buf, sizeof(u32), items, fp);
3038 if (rc)
3039 return rc;
3040
3041 rc = put_entry(key, 1, len, fp);
3042 if (rc)
3043 return rc;
3044
3045 return 0;
3046}
3047
3048static int user_write(void *vkey, void *datum, void *ptr)
3049{
3050 char *key = vkey;
3051 struct user_datum *usrdatum = datum;
3052 struct policy_data *pd = ptr;
3053 struct policydb *p = pd->p;
3054 void *fp = pd->fp;
3055 __le32 buf[3];
3056 size_t items, len;
3057 int rc;
3058
3059 len = strlen(key);
3060 items = 0;
3061 buf[items++] = cpu_to_le32(len);
3062 buf[items++] = cpu_to_le32(usrdatum->value);
3063 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
3064 buf[items++] = cpu_to_le32(usrdatum->bounds);
3065 BUG_ON(items > ARRAY_SIZE(buf));
3066 rc = put_entry(buf, sizeof(u32), items, fp);
3067 if (rc)
3068 return rc;
3069
3070 rc = put_entry(key, 1, len, fp);
3071 if (rc)
3072 return rc;
3073
3074 rc = ebitmap_write(&usrdatum->roles, fp);
3075 if (rc)
3076 return rc;
3077
3078 rc = mls_write_range_helper(&usrdatum->range, fp);
3079 if (rc)
3080 return rc;
3081
3082 rc = mls_write_level(&usrdatum->dfltlevel, fp);
3083 if (rc)
3084 return rc;
3085
3086 return 0;
3087}
3088
3089static int (*write_f[SYM_NUM]) (void *key, void *datum,
3090 void *datap) =
3091{
3092 common_write,
3093 class_write,
3094 role_write,
3095 type_write,
3096 user_write,
3097 cond_write_bool,
3098 sens_write,
3099 cat_write,
3100};
3101
3102static int ocontext_write(struct policydb *p, struct policydb_compat_info *info,
3103 void *fp)
3104{
3105 unsigned int i, j, rc;
3106 size_t nel, len;
3107 __le32 buf[3];
3108 u32 nodebuf[8];
3109 struct ocontext *c;
3110 for (i = 0; i < info->ocon_num; i++) {
3111 nel = 0;
3112 for (c = p->ocontexts[i]; c; c = c->next)
3113 nel++;
3114 buf[0] = cpu_to_le32(nel);
3115 rc = put_entry(buf, sizeof(u32), 1, fp);
3116 if (rc)
3117 return rc;
3118 for (c = p->ocontexts[i]; c; c = c->next) {
3119 switch (i) {
3120 case OCON_ISID:
3121 buf[0] = cpu_to_le32(c->sid[0]);
3122 rc = put_entry(buf, sizeof(u32), 1, fp);
3123 if (rc)
3124 return rc;
3125 rc = context_write(p, &c->context[0], fp);
3126 if (rc)
3127 return rc;
3128 break;
3129 case OCON_FS:
3130 case OCON_NETIF:
3131 len = strlen(c->u.name);
3132 buf[0] = cpu_to_le32(len);
3133 rc = put_entry(buf, sizeof(u32), 1, fp);
3134 if (rc)
3135 return rc;
3136 rc = put_entry(c->u.name, 1, len, fp);
3137 if (rc)
3138 return rc;
3139 rc = context_write(p, &c->context[0], fp);
3140 if (rc)
3141 return rc;
3142 rc = context_write(p, &c->context[1], fp);
3143 if (rc)
3144 return rc;
3145 break;
3146 case OCON_PORT:
3147 buf[0] = cpu_to_le32(c->u.port.protocol);
3148 buf[1] = cpu_to_le32(c->u.port.low_port);
3149 buf[2] = cpu_to_le32(c->u.port.high_port);
3150 rc = put_entry(buf, sizeof(u32), 3, fp);
3151 if (rc)
3152 return rc;
3153 rc = context_write(p, &c->context[0], fp);
3154 if (rc)
3155 return rc;
3156 break;
3157 case OCON_NODE:
3158 nodebuf[0] = c->u.node.addr; /* network order */
3159 nodebuf[1] = c->u.node.mask; /* network order */
3160 rc = put_entry(nodebuf, sizeof(u32), 2, fp);
3161 if (rc)
3162 return rc;
3163 rc = context_write(p, &c->context[0], fp);
3164 if (rc)
3165 return rc;
3166 break;
3167 case OCON_FSUSE:
3168 buf[0] = cpu_to_le32(c->v.behavior);
3169 len = strlen(c->u.name);
3170 buf[1] = cpu_to_le32(len);
3171 rc = put_entry(buf, sizeof(u32), 2, fp);
3172 if (rc)
3173 return rc;
3174 rc = put_entry(c->u.name, 1, len, fp);
3175 if (rc)
3176 return rc;
3177 rc = context_write(p, &c->context[0], fp);
3178 if (rc)
3179 return rc;
3180 break;
3181 case OCON_NODE6:
3182 for (j = 0; j < 4; j++)
3183 nodebuf[j] = c->u.node6.addr[j]; /* network order */
3184 for (j = 0; j < 4; j++)
3185 nodebuf[j + 4] = c->u.node6.mask[j]; /* network order */
3186 rc = put_entry(nodebuf, sizeof(u32), 8, fp);
3187 if (rc)
3188 return rc;
3189 rc = context_write(p, &c->context[0], fp);
3190 if (rc)
3191 return rc;
3192 break;
3193 case OCON_IBPKEY:
3194 *((__be64 *)nodebuf) = cpu_to_be64(c->u.ibpkey.subnet_prefix);
3195
3196 nodebuf[2] = cpu_to_le32(c->u.ibpkey.low_pkey);
3197 nodebuf[3] = cpu_to_le32(c->u.ibpkey.high_pkey);
3198
3199 rc = put_entry(nodebuf, sizeof(u32), 4, fp);
3200 if (rc)
3201 return rc;
3202 rc = context_write(p, &c->context[0], fp);
3203 if (rc)
3204 return rc;
3205 break;
3206 case OCON_IBENDPORT:
3207 len = strlen(c->u.ibendport.dev_name);
3208 buf[0] = cpu_to_le32(len);
3209 buf[1] = cpu_to_le32(c->u.ibendport.port);
3210 rc = put_entry(buf, sizeof(u32), 2, fp);
3211 if (rc)
3212 return rc;
3213 rc = put_entry(c->u.ibendport.dev_name, 1, len, fp);
3214 if (rc)
3215 return rc;
3216 rc = context_write(p, &c->context[0], fp);
3217 if (rc)
3218 return rc;
3219 break;
3220 }
3221 }
3222 }
3223 return 0;
3224}
3225
3226static int genfs_write(struct policydb *p, void *fp)
3227{
3228 struct genfs *genfs;
3229 struct ocontext *c;
3230 size_t len;
3231 __le32 buf[1];
3232 int rc;
3233
3234 len = 0;
3235 for (genfs = p->genfs; genfs; genfs = genfs->next)
3236 len++;
3237 buf[0] = cpu_to_le32(len);
3238 rc = put_entry(buf, sizeof(u32), 1, fp);
3239 if (rc)
3240 return rc;
3241 for (genfs = p->genfs; genfs; genfs = genfs->next) {
3242 len = strlen(genfs->fstype);
3243 buf[0] = cpu_to_le32(len);
3244 rc = put_entry(buf, sizeof(u32), 1, fp);
3245 if (rc)
3246 return rc;
3247 rc = put_entry(genfs->fstype, 1, len, fp);
3248 if (rc)
3249 return rc;
3250 len = 0;
3251 for (c = genfs->head; c; c = c->next)
3252 len++;
3253 buf[0] = cpu_to_le32(len);
3254 rc = put_entry(buf, sizeof(u32), 1, fp);
3255 if (rc)
3256 return rc;
3257 for (c = genfs->head; c; c = c->next) {
3258 len = strlen(c->u.name);
3259 buf[0] = cpu_to_le32(len);
3260 rc = put_entry(buf, sizeof(u32), 1, fp);
3261 if (rc)
3262 return rc;
3263 rc = put_entry(c->u.name, 1, len, fp);
3264 if (rc)
3265 return rc;
3266 buf[0] = cpu_to_le32(c->v.sclass);
3267 rc = put_entry(buf, sizeof(u32), 1, fp);
3268 if (rc)
3269 return rc;
3270 rc = context_write(p, &c->context[0], fp);
3271 if (rc)
3272 return rc;
3273 }
3274 }
3275 return 0;
3276}
3277
3278static int hashtab_cnt(void *key, void *data, void *ptr)
3279{
3280 int *cnt = ptr;
3281 *cnt = *cnt + 1;
3282
3283 return 0;
3284}
3285
3286static int range_write_helper(void *key, void *data, void *ptr)
3287{
3288 __le32 buf[2];
3289 struct range_trans *rt = key;
3290 struct mls_range *r = data;
3291 struct policy_data *pd = ptr;
3292 void *fp = pd->fp;
3293 struct policydb *p = pd->p;
3294 int rc;
3295
3296 buf[0] = cpu_to_le32(rt->source_type);
3297 buf[1] = cpu_to_le32(rt->target_type);
3298 rc = put_entry(buf, sizeof(u32), 2, fp);
3299 if (rc)
3300 return rc;
3301 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
3302 buf[0] = cpu_to_le32(rt->target_class);
3303 rc = put_entry(buf, sizeof(u32), 1, fp);
3304 if (rc)
3305 return rc;
3306 }
3307 rc = mls_write_range_helper(r, fp);
3308 if (rc)
3309 return rc;
3310
3311 return 0;
3312}
3313
3314static int range_write(struct policydb *p, void *fp)
3315{
3316 __le32 buf[1];
3317 int rc, nel;
3318 struct policy_data pd;
3319
3320 pd.p = p;
3321 pd.fp = fp;
3322
3323 /* count the number of entries in the hashtab */
3324 nel = 0;
3325 rc = hashtab_map(p->range_tr, hashtab_cnt, &nel);
3326 if (rc)
3327 return rc;
3328
3329 buf[0] = cpu_to_le32(nel);
3330 rc = put_entry(buf, sizeof(u32), 1, fp);
3331 if (rc)
3332 return rc;
3333
3334 /* actually write all of the entries */
3335 rc = hashtab_map(p->range_tr, range_write_helper, &pd);
3336 if (rc)
3337 return rc;
3338
3339 return 0;
3340}
3341
3342static int filename_write_helper(void *key, void *data, void *ptr)
3343{
3344 __le32 buf[4];
3345 struct filename_trans *ft = key;
3346 struct filename_trans_datum *otype = data;
3347 void *fp = ptr;
3348 int rc;
3349 u32 len;
3350
3351 len = strlen(ft->name);
3352 buf[0] = cpu_to_le32(len);
3353 rc = put_entry(buf, sizeof(u32), 1, fp);
3354 if (rc)
3355 return rc;
3356
3357 rc = put_entry(ft->name, sizeof(char), len, fp);
3358 if (rc)
3359 return rc;
3360
3361 buf[0] = cpu_to_le32(ft->stype);
3362 buf[1] = cpu_to_le32(ft->ttype);
3363 buf[2] = cpu_to_le32(ft->tclass);
3364 buf[3] = cpu_to_le32(otype->otype);
3365
3366 rc = put_entry(buf, sizeof(u32), 4, fp);
3367 if (rc)
3368 return rc;
3369
3370 return 0;
3371}
3372
3373static int filename_trans_write(struct policydb *p, void *fp)
3374{
3375 u32 nel;
3376 __le32 buf[1];
3377 int rc;
3378
3379 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
3380 return 0;
3381
3382 nel = 0;
3383 rc = hashtab_map(p->filename_trans, hashtab_cnt, &nel);
3384 if (rc)
3385 return rc;
3386
3387 buf[0] = cpu_to_le32(nel);
3388 rc = put_entry(buf, sizeof(u32), 1, fp);
3389 if (rc)
3390 return rc;
3391
3392 rc = hashtab_map(p->filename_trans, filename_write_helper, fp);
3393 if (rc)
3394 return rc;
3395
3396 return 0;
3397}
3398
3399/*
3400 * Write the configuration data in a policy database
3401 * structure to a policy database binary representation
3402 * file.
3403 */
3404int policydb_write(struct policydb *p, void *fp)
3405{
3406 unsigned int i, num_syms;
3407 int rc;
3408 __le32 buf[4];
3409 u32 config;
3410 size_t len;
3411 struct policydb_compat_info *info;
3412
3413 /*
3414 * refuse to write policy older than compressed avtab
3415 * to simplify the writer. There are other tests dropped
3416 * since we assume this throughout the writer code. Be
3417 * careful if you ever try to remove this restriction
3418 */
3419 if (p->policyvers < POLICYDB_VERSION_AVTAB) {
3420 printk(KERN_ERR "SELinux: refusing to write policy version %d."
3421 " Because it is less than version %d\n", p->policyvers,
3422 POLICYDB_VERSION_AVTAB);
3423 return -EINVAL;
3424 }
3425
3426 config = 0;
3427 if (p->mls_enabled)
3428 config |= POLICYDB_CONFIG_MLS;
3429
3430 if (p->reject_unknown)
3431 config |= REJECT_UNKNOWN;
3432 if (p->allow_unknown)
3433 config |= ALLOW_UNKNOWN;
3434
3435 /* Write the magic number and string identifiers. */
3436 buf[0] = cpu_to_le32(POLICYDB_MAGIC);
3437 len = strlen(POLICYDB_STRING);
3438 buf[1] = cpu_to_le32(len);
3439 rc = put_entry(buf, sizeof(u32), 2, fp);
3440 if (rc)
3441 return rc;
3442 rc = put_entry(POLICYDB_STRING, 1, len, fp);
3443 if (rc)
3444 return rc;
3445
3446 /* Write the version, config, and table sizes. */
3447 info = policydb_lookup_compat(p->policyvers);
3448 if (!info) {
3449 printk(KERN_ERR "SELinux: compatibility lookup failed for policy "
3450 "version %d", p->policyvers);
3451 return -EINVAL;
3452 }
3453
3454 buf[0] = cpu_to_le32(p->policyvers);
3455 buf[1] = cpu_to_le32(config);
3456 buf[2] = cpu_to_le32(info->sym_num);
3457 buf[3] = cpu_to_le32(info->ocon_num);
3458
3459 rc = put_entry(buf, sizeof(u32), 4, fp);
3460 if (rc)
3461 return rc;
3462
3463 if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
3464 rc = ebitmap_write(&p->policycaps, fp);
3465 if (rc)
3466 return rc;
3467 }
3468
3469 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
3470 rc = ebitmap_write(&p->permissive_map, fp);
3471 if (rc)
3472 return rc;
3473 }
3474
3475 num_syms = info->sym_num;
3476 for (i = 0; i < num_syms; i++) {
3477 struct policy_data pd;
3478
3479 pd.fp = fp;
3480 pd.p = p;
3481
3482 buf[0] = cpu_to_le32(p->symtab[i].nprim);
3483 buf[1] = cpu_to_le32(p->symtab[i].table->nel);
3484
3485 rc = put_entry(buf, sizeof(u32), 2, fp);
3486 if (rc)
3487 return rc;
3488 rc = hashtab_map(p->symtab[i].table, write_f[i], &pd);
3489 if (rc)
3490 return rc;
3491 }
3492
3493 rc = avtab_write(p, &p->te_avtab, fp);
3494 if (rc)
3495 return rc;
3496
3497 rc = cond_write_list(p, p->cond_list, fp);
3498 if (rc)
3499 return rc;
3500
3501 rc = role_trans_write(p, fp);
3502 if (rc)
3503 return rc;
3504
3505 rc = role_allow_write(p->role_allow, fp);
3506 if (rc)
3507 return rc;
3508
3509 rc = filename_trans_write(p, fp);
3510 if (rc)
3511 return rc;
3512
3513 rc = ocontext_write(p, info, fp);
3514 if (rc)
3515 return rc;
3516
3517 rc = genfs_write(p, fp);
3518 if (rc)
3519 return rc;
3520
3521 rc = range_write(p, fp);
3522 if (rc)
3523 return rc;
3524
3525 for (i = 0; i < p->p_types.nprim; i++) {
3526 struct ebitmap *e = flex_array_get(p->type_attr_map_array, i);
3527
3528 BUG_ON(!e);
3529 rc = ebitmap_write(e, fp);
3530 if (rc)
3531 return rc;
3532 }
3533
3534 return 0;
3535}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Implementation of the policy database.
4 *
5 * Author : Stephen Smalley, <sds@tycho.nsa.gov>
6 */
7
8/*
9 * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
10 *
11 * Support for enhanced MLS infrastructure.
12 *
13 * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
14 *
15 * Added conditional policy language extensions
16 *
17 * Updated: Hewlett-Packard <paul@paul-moore.com>
18 *
19 * Added support for the policy capability bitmap
20 *
21 * Update: Mellanox Techonologies
22 *
23 * Added Infiniband support
24 *
25 * Copyright (C) 2016 Mellanox Techonologies
26 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
27 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
28 * Copyright (C) 2003 - 2004 Tresys Technology, LLC
29 */
30
31#include <linux/kernel.h>
32#include <linux/sched.h>
33#include <linux/slab.h>
34#include <linux/string.h>
35#include <linux/errno.h>
36#include <linux/audit.h>
37#include "security.h"
38
39#include "policydb.h"
40#include "conditional.h"
41#include "mls.h"
42#include "services.h"
43
44#define _DEBUG_HASHES
45
46#ifdef DEBUG_HASHES
47static const char *symtab_name[SYM_NUM] = {
48 "common prefixes",
49 "classes",
50 "roles",
51 "types",
52 "users",
53 "bools",
54 "levels",
55 "categories",
56};
57#endif
58
59struct policydb_compat_info {
60 int version;
61 int sym_num;
62 int ocon_num;
63};
64
65/* These need to be updated if SYM_NUM or OCON_NUM changes */
66static struct policydb_compat_info policydb_compat[] = {
67 {
68 .version = POLICYDB_VERSION_BASE,
69 .sym_num = SYM_NUM - 3,
70 .ocon_num = OCON_NUM - 3,
71 },
72 {
73 .version = POLICYDB_VERSION_BOOL,
74 .sym_num = SYM_NUM - 2,
75 .ocon_num = OCON_NUM - 3,
76 },
77 {
78 .version = POLICYDB_VERSION_IPV6,
79 .sym_num = SYM_NUM - 2,
80 .ocon_num = OCON_NUM - 2,
81 },
82 {
83 .version = POLICYDB_VERSION_NLCLASS,
84 .sym_num = SYM_NUM - 2,
85 .ocon_num = OCON_NUM - 2,
86 },
87 {
88 .version = POLICYDB_VERSION_MLS,
89 .sym_num = SYM_NUM,
90 .ocon_num = OCON_NUM - 2,
91 },
92 {
93 .version = POLICYDB_VERSION_AVTAB,
94 .sym_num = SYM_NUM,
95 .ocon_num = OCON_NUM - 2,
96 },
97 {
98 .version = POLICYDB_VERSION_RANGETRANS,
99 .sym_num = SYM_NUM,
100 .ocon_num = OCON_NUM - 2,
101 },
102 {
103 .version = POLICYDB_VERSION_POLCAP,
104 .sym_num = SYM_NUM,
105 .ocon_num = OCON_NUM - 2,
106 },
107 {
108 .version = POLICYDB_VERSION_PERMISSIVE,
109 .sym_num = SYM_NUM,
110 .ocon_num = OCON_NUM - 2,
111 },
112 {
113 .version = POLICYDB_VERSION_BOUNDARY,
114 .sym_num = SYM_NUM,
115 .ocon_num = OCON_NUM - 2,
116 },
117 {
118 .version = POLICYDB_VERSION_FILENAME_TRANS,
119 .sym_num = SYM_NUM,
120 .ocon_num = OCON_NUM - 2,
121 },
122 {
123 .version = POLICYDB_VERSION_ROLETRANS,
124 .sym_num = SYM_NUM,
125 .ocon_num = OCON_NUM - 2,
126 },
127 {
128 .version = POLICYDB_VERSION_NEW_OBJECT_DEFAULTS,
129 .sym_num = SYM_NUM,
130 .ocon_num = OCON_NUM - 2,
131 },
132 {
133 .version = POLICYDB_VERSION_DEFAULT_TYPE,
134 .sym_num = SYM_NUM,
135 .ocon_num = OCON_NUM - 2,
136 },
137 {
138 .version = POLICYDB_VERSION_CONSTRAINT_NAMES,
139 .sym_num = SYM_NUM,
140 .ocon_num = OCON_NUM - 2,
141 },
142 {
143 .version = POLICYDB_VERSION_XPERMS_IOCTL,
144 .sym_num = SYM_NUM,
145 .ocon_num = OCON_NUM - 2,
146 },
147 {
148 .version = POLICYDB_VERSION_INFINIBAND,
149 .sym_num = SYM_NUM,
150 .ocon_num = OCON_NUM,
151 },
152 {
153 .version = POLICYDB_VERSION_GLBLUB,
154 .sym_num = SYM_NUM,
155 .ocon_num = OCON_NUM,
156 },
157 {
158 .version = POLICYDB_VERSION_COMP_FTRANS,
159 .sym_num = SYM_NUM,
160 .ocon_num = OCON_NUM,
161 },
162};
163
164static struct policydb_compat_info *policydb_lookup_compat(int version)
165{
166 int i;
167 struct policydb_compat_info *info = NULL;
168
169 for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) {
170 if (policydb_compat[i].version == version) {
171 info = &policydb_compat[i];
172 break;
173 }
174 }
175 return info;
176}
177
178/*
179 * The following *_destroy functions are used to
180 * free any memory allocated for each kind of
181 * symbol data in the policy database.
182 */
183
184static int perm_destroy(void *key, void *datum, void *p)
185{
186 kfree(key);
187 kfree(datum);
188 return 0;
189}
190
191static int common_destroy(void *key, void *datum, void *p)
192{
193 struct common_datum *comdatum;
194
195 kfree(key);
196 if (datum) {
197 comdatum = datum;
198 hashtab_map(&comdatum->permissions.table, perm_destroy, NULL);
199 hashtab_destroy(&comdatum->permissions.table);
200 }
201 kfree(datum);
202 return 0;
203}
204
205static void constraint_expr_destroy(struct constraint_expr *expr)
206{
207 if (expr) {
208 ebitmap_destroy(&expr->names);
209 if (expr->type_names) {
210 ebitmap_destroy(&expr->type_names->types);
211 ebitmap_destroy(&expr->type_names->negset);
212 kfree(expr->type_names);
213 }
214 kfree(expr);
215 }
216}
217
218static int cls_destroy(void *key, void *datum, void *p)
219{
220 struct class_datum *cladatum;
221 struct constraint_node *constraint, *ctemp;
222 struct constraint_expr *e, *etmp;
223
224 kfree(key);
225 if (datum) {
226 cladatum = datum;
227 hashtab_map(&cladatum->permissions.table, perm_destroy, NULL);
228 hashtab_destroy(&cladatum->permissions.table);
229 constraint = cladatum->constraints;
230 while (constraint) {
231 e = constraint->expr;
232 while (e) {
233 etmp = e;
234 e = e->next;
235 constraint_expr_destroy(etmp);
236 }
237 ctemp = constraint;
238 constraint = constraint->next;
239 kfree(ctemp);
240 }
241
242 constraint = cladatum->validatetrans;
243 while (constraint) {
244 e = constraint->expr;
245 while (e) {
246 etmp = e;
247 e = e->next;
248 constraint_expr_destroy(etmp);
249 }
250 ctemp = constraint;
251 constraint = constraint->next;
252 kfree(ctemp);
253 }
254 kfree(cladatum->comkey);
255 }
256 kfree(datum);
257 return 0;
258}
259
260static int role_destroy(void *key, void *datum, void *p)
261{
262 struct role_datum *role;
263
264 kfree(key);
265 if (datum) {
266 role = datum;
267 ebitmap_destroy(&role->dominates);
268 ebitmap_destroy(&role->types);
269 }
270 kfree(datum);
271 return 0;
272}
273
274static int type_destroy(void *key, void *datum, void *p)
275{
276 kfree(key);
277 kfree(datum);
278 return 0;
279}
280
281static int user_destroy(void *key, void *datum, void *p)
282{
283 struct user_datum *usrdatum;
284
285 kfree(key);
286 if (datum) {
287 usrdatum = datum;
288 ebitmap_destroy(&usrdatum->roles);
289 ebitmap_destroy(&usrdatum->range.level[0].cat);
290 ebitmap_destroy(&usrdatum->range.level[1].cat);
291 ebitmap_destroy(&usrdatum->dfltlevel.cat);
292 }
293 kfree(datum);
294 return 0;
295}
296
297static int sens_destroy(void *key, void *datum, void *p)
298{
299 struct level_datum *levdatum;
300
301 kfree(key);
302 if (datum) {
303 levdatum = datum;
304 if (levdatum->level)
305 ebitmap_destroy(&levdatum->level->cat);
306 kfree(levdatum->level);
307 }
308 kfree(datum);
309 return 0;
310}
311
312static int cat_destroy(void *key, void *datum, void *p)
313{
314 kfree(key);
315 kfree(datum);
316 return 0;
317}
318
319static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) =
320{
321 common_destroy,
322 cls_destroy,
323 role_destroy,
324 type_destroy,
325 user_destroy,
326 cond_destroy_bool,
327 sens_destroy,
328 cat_destroy,
329};
330
331static int filenametr_destroy(void *key, void *datum, void *p)
332{
333 struct filename_trans_key *ft = key;
334 struct filename_trans_datum *next, *d = datum;
335
336 kfree(ft->name);
337 kfree(key);
338 do {
339 ebitmap_destroy(&d->stypes);
340 next = d->next;
341 kfree(d);
342 d = next;
343 } while (unlikely(d));
344 cond_resched();
345 return 0;
346}
347
348static int range_tr_destroy(void *key, void *datum, void *p)
349{
350 struct mls_range *rt = datum;
351
352 kfree(key);
353 ebitmap_destroy(&rt->level[0].cat);
354 ebitmap_destroy(&rt->level[1].cat);
355 kfree(datum);
356 cond_resched();
357 return 0;
358}
359
360static int role_tr_destroy(void *key, void *datum, void *p)
361{
362 kfree(key);
363 kfree(datum);
364 return 0;
365}
366
367static void ocontext_destroy(struct ocontext *c, int i)
368{
369 if (!c)
370 return;
371
372 context_destroy(&c->context[0]);
373 context_destroy(&c->context[1]);
374 if (i == OCON_ISID || i == OCON_FS ||
375 i == OCON_NETIF || i == OCON_FSUSE)
376 kfree(c->u.name);
377 kfree(c);
378}
379
380/*
381 * Initialize the role table.
382 */
383static int roles_init(struct policydb *p)
384{
385 char *key = NULL;
386 int rc;
387 struct role_datum *role;
388
389 role = kzalloc(sizeof(*role), GFP_KERNEL);
390 if (!role)
391 return -ENOMEM;
392
393 rc = -EINVAL;
394 role->value = ++p->p_roles.nprim;
395 if (role->value != OBJECT_R_VAL)
396 goto out;
397
398 rc = -ENOMEM;
399 key = kstrdup(OBJECT_R, GFP_KERNEL);
400 if (!key)
401 goto out;
402
403 rc = symtab_insert(&p->p_roles, key, role);
404 if (rc)
405 goto out;
406
407 return 0;
408out:
409 kfree(key);
410 kfree(role);
411 return rc;
412}
413
414static u32 filenametr_hash(const void *k)
415{
416 const struct filename_trans_key *ft = k;
417 unsigned long hash;
418 unsigned int byte_num;
419 unsigned char focus;
420
421 hash = ft->ttype ^ ft->tclass;
422
423 byte_num = 0;
424 while ((focus = ft->name[byte_num++]))
425 hash = partial_name_hash(focus, hash);
426 return hash;
427}
428
429static int filenametr_cmp(const void *k1, const void *k2)
430{
431 const struct filename_trans_key *ft1 = k1;
432 const struct filename_trans_key *ft2 = k2;
433 int v;
434
435 v = ft1->ttype - ft2->ttype;
436 if (v)
437 return v;
438
439 v = ft1->tclass - ft2->tclass;
440 if (v)
441 return v;
442
443 return strcmp(ft1->name, ft2->name);
444
445}
446
447static const struct hashtab_key_params filenametr_key_params = {
448 .hash = filenametr_hash,
449 .cmp = filenametr_cmp,
450};
451
452struct filename_trans_datum *policydb_filenametr_search(
453 struct policydb *p, struct filename_trans_key *key)
454{
455 return hashtab_search(&p->filename_trans, key, filenametr_key_params);
456}
457
458static u32 rangetr_hash(const void *k)
459{
460 const struct range_trans *key = k;
461
462 return key->source_type + (key->target_type << 3) +
463 (key->target_class << 5);
464}
465
466static int rangetr_cmp(const void *k1, const void *k2)
467{
468 const struct range_trans *key1 = k1, *key2 = k2;
469 int v;
470
471 v = key1->source_type - key2->source_type;
472 if (v)
473 return v;
474
475 v = key1->target_type - key2->target_type;
476 if (v)
477 return v;
478
479 v = key1->target_class - key2->target_class;
480
481 return v;
482}
483
484static const struct hashtab_key_params rangetr_key_params = {
485 .hash = rangetr_hash,
486 .cmp = rangetr_cmp,
487};
488
489struct mls_range *policydb_rangetr_search(struct policydb *p,
490 struct range_trans *key)
491{
492 return hashtab_search(&p->range_tr, key, rangetr_key_params);
493}
494
495static u32 role_trans_hash(const void *k)
496{
497 const struct role_trans_key *key = k;
498
499 return key->role + (key->type << 3) + (key->tclass << 5);
500}
501
502static int role_trans_cmp(const void *k1, const void *k2)
503{
504 const struct role_trans_key *key1 = k1, *key2 = k2;
505 int v;
506
507 v = key1->role - key2->role;
508 if (v)
509 return v;
510
511 v = key1->type - key2->type;
512 if (v)
513 return v;
514
515 return key1->tclass - key2->tclass;
516}
517
518static const struct hashtab_key_params roletr_key_params = {
519 .hash = role_trans_hash,
520 .cmp = role_trans_cmp,
521};
522
523struct role_trans_datum *policydb_roletr_search(struct policydb *p,
524 struct role_trans_key *key)
525{
526 return hashtab_search(&p->role_tr, key, roletr_key_params);
527}
528
529/*
530 * Initialize a policy database structure.
531 */
532static void policydb_init(struct policydb *p)
533{
534 memset(p, 0, sizeof(*p));
535
536 avtab_init(&p->te_avtab);
537 cond_policydb_init(p);
538
539 ebitmap_init(&p->filename_trans_ttypes);
540 ebitmap_init(&p->policycaps);
541 ebitmap_init(&p->permissive_map);
542}
543
544/*
545 * The following *_index functions are used to
546 * define the val_to_name and val_to_struct arrays
547 * in a policy database structure. The val_to_name
548 * arrays are used when converting security context
549 * structures into string representations. The
550 * val_to_struct arrays are used when the attributes
551 * of a class, role, or user are needed.
552 */
553
554static int common_index(void *key, void *datum, void *datap)
555{
556 struct policydb *p;
557 struct common_datum *comdatum;
558
559 comdatum = datum;
560 p = datap;
561 if (!comdatum->value || comdatum->value > p->p_commons.nprim)
562 return -EINVAL;
563
564 p->sym_val_to_name[SYM_COMMONS][comdatum->value - 1] = key;
565
566 return 0;
567}
568
569static int class_index(void *key, void *datum, void *datap)
570{
571 struct policydb *p;
572 struct class_datum *cladatum;
573
574 cladatum = datum;
575 p = datap;
576 if (!cladatum->value || cladatum->value > p->p_classes.nprim)
577 return -EINVAL;
578
579 p->sym_val_to_name[SYM_CLASSES][cladatum->value - 1] = key;
580 p->class_val_to_struct[cladatum->value - 1] = cladatum;
581 return 0;
582}
583
584static int role_index(void *key, void *datum, void *datap)
585{
586 struct policydb *p;
587 struct role_datum *role;
588
589 role = datum;
590 p = datap;
591 if (!role->value
592 || role->value > p->p_roles.nprim
593 || role->bounds > p->p_roles.nprim)
594 return -EINVAL;
595
596 p->sym_val_to_name[SYM_ROLES][role->value - 1] = key;
597 p->role_val_to_struct[role->value - 1] = role;
598 return 0;
599}
600
601static int type_index(void *key, void *datum, void *datap)
602{
603 struct policydb *p;
604 struct type_datum *typdatum;
605
606 typdatum = datum;
607 p = datap;
608
609 if (typdatum->primary) {
610 if (!typdatum->value
611 || typdatum->value > p->p_types.nprim
612 || typdatum->bounds > p->p_types.nprim)
613 return -EINVAL;
614 p->sym_val_to_name[SYM_TYPES][typdatum->value - 1] = key;
615 p->type_val_to_struct[typdatum->value - 1] = typdatum;
616 }
617
618 return 0;
619}
620
621static int user_index(void *key, void *datum, void *datap)
622{
623 struct policydb *p;
624 struct user_datum *usrdatum;
625
626 usrdatum = datum;
627 p = datap;
628 if (!usrdatum->value
629 || usrdatum->value > p->p_users.nprim
630 || usrdatum->bounds > p->p_users.nprim)
631 return -EINVAL;
632
633 p->sym_val_to_name[SYM_USERS][usrdatum->value - 1] = key;
634 p->user_val_to_struct[usrdatum->value - 1] = usrdatum;
635 return 0;
636}
637
638static int sens_index(void *key, void *datum, void *datap)
639{
640 struct policydb *p;
641 struct level_datum *levdatum;
642
643 levdatum = datum;
644 p = datap;
645
646 if (!levdatum->isalias) {
647 if (!levdatum->level->sens ||
648 levdatum->level->sens > p->p_levels.nprim)
649 return -EINVAL;
650
651 p->sym_val_to_name[SYM_LEVELS][levdatum->level->sens - 1] = key;
652 }
653
654 return 0;
655}
656
657static int cat_index(void *key, void *datum, void *datap)
658{
659 struct policydb *p;
660 struct cat_datum *catdatum;
661
662 catdatum = datum;
663 p = datap;
664
665 if (!catdatum->isalias) {
666 if (!catdatum->value || catdatum->value > p->p_cats.nprim)
667 return -EINVAL;
668
669 p->sym_val_to_name[SYM_CATS][catdatum->value - 1] = key;
670 }
671
672 return 0;
673}
674
675static int (*index_f[SYM_NUM]) (void *key, void *datum, void *datap) =
676{
677 common_index,
678 class_index,
679 role_index,
680 type_index,
681 user_index,
682 cond_index_bool,
683 sens_index,
684 cat_index,
685};
686
687#ifdef DEBUG_HASHES
688static void hash_eval(struct hashtab *h, const char *hash_name)
689{
690 struct hashtab_info info;
691
692 hashtab_stat(h, &info);
693 pr_debug("SELinux: %s: %d entries and %d/%d buckets used, longest chain length %d\n",
694 hash_name, h->nel, info.slots_used, h->size,
695 info.max_chain_len);
696}
697
698static void symtab_hash_eval(struct symtab *s)
699{
700 int i;
701
702 for (i = 0; i < SYM_NUM; i++)
703 hash_eval(&s[i].table, symtab_name[i]);
704}
705
706#else
707static inline void hash_eval(struct hashtab *h, char *hash_name)
708{
709}
710#endif
711
712/*
713 * Define the other val_to_name and val_to_struct arrays
714 * in a policy database structure.
715 *
716 * Caller must clean up on failure.
717 */
718static int policydb_index(struct policydb *p)
719{
720 int i, rc;
721
722 if (p->mls_enabled)
723 pr_debug("SELinux: %d users, %d roles, %d types, %d bools, %d sens, %d cats\n",
724 p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim,
725 p->p_bools.nprim, p->p_levels.nprim, p->p_cats.nprim);
726 else
727 pr_debug("SELinux: %d users, %d roles, %d types, %d bools\n",
728 p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim,
729 p->p_bools.nprim);
730
731 pr_debug("SELinux: %d classes, %d rules\n",
732 p->p_classes.nprim, p->te_avtab.nel);
733
734#ifdef DEBUG_HASHES
735 avtab_hash_eval(&p->te_avtab, "rules");
736 symtab_hash_eval(p->symtab);
737#endif
738
739 p->class_val_to_struct = kcalloc(p->p_classes.nprim,
740 sizeof(*p->class_val_to_struct),
741 GFP_KERNEL);
742 if (!p->class_val_to_struct)
743 return -ENOMEM;
744
745 p->role_val_to_struct = kcalloc(p->p_roles.nprim,
746 sizeof(*p->role_val_to_struct),
747 GFP_KERNEL);
748 if (!p->role_val_to_struct)
749 return -ENOMEM;
750
751 p->user_val_to_struct = kcalloc(p->p_users.nprim,
752 sizeof(*p->user_val_to_struct),
753 GFP_KERNEL);
754 if (!p->user_val_to_struct)
755 return -ENOMEM;
756
757 p->type_val_to_struct = kvcalloc(p->p_types.nprim,
758 sizeof(*p->type_val_to_struct),
759 GFP_KERNEL);
760 if (!p->type_val_to_struct)
761 return -ENOMEM;
762
763 rc = cond_init_bool_indexes(p);
764 if (rc)
765 goto out;
766
767 for (i = 0; i < SYM_NUM; i++) {
768 p->sym_val_to_name[i] = kvcalloc(p->symtab[i].nprim,
769 sizeof(char *),
770 GFP_KERNEL);
771 if (!p->sym_val_to_name[i])
772 return -ENOMEM;
773
774 rc = hashtab_map(&p->symtab[i].table, index_f[i], p);
775 if (rc)
776 goto out;
777 }
778 rc = 0;
779out:
780 return rc;
781}
782
783/*
784 * Free any memory allocated by a policy database structure.
785 */
786void policydb_destroy(struct policydb *p)
787{
788 struct ocontext *c, *ctmp;
789 struct genfs *g, *gtmp;
790 int i;
791 struct role_allow *ra, *lra = NULL;
792
793 for (i = 0; i < SYM_NUM; i++) {
794 cond_resched();
795 hashtab_map(&p->symtab[i].table, destroy_f[i], NULL);
796 hashtab_destroy(&p->symtab[i].table);
797 }
798
799 for (i = 0; i < SYM_NUM; i++)
800 kvfree(p->sym_val_to_name[i]);
801
802 kfree(p->class_val_to_struct);
803 kfree(p->role_val_to_struct);
804 kfree(p->user_val_to_struct);
805 kvfree(p->type_val_to_struct);
806
807 avtab_destroy(&p->te_avtab);
808
809 for (i = 0; i < OCON_NUM; i++) {
810 cond_resched();
811 c = p->ocontexts[i];
812 while (c) {
813 ctmp = c;
814 c = c->next;
815 ocontext_destroy(ctmp, i);
816 }
817 p->ocontexts[i] = NULL;
818 }
819
820 g = p->genfs;
821 while (g) {
822 cond_resched();
823 kfree(g->fstype);
824 c = g->head;
825 while (c) {
826 ctmp = c;
827 c = c->next;
828 ocontext_destroy(ctmp, OCON_FSUSE);
829 }
830 gtmp = g;
831 g = g->next;
832 kfree(gtmp);
833 }
834 p->genfs = NULL;
835
836 cond_policydb_destroy(p);
837
838 hashtab_map(&p->role_tr, role_tr_destroy, NULL);
839 hashtab_destroy(&p->role_tr);
840
841 for (ra = p->role_allow; ra; ra = ra->next) {
842 cond_resched();
843 kfree(lra);
844 lra = ra;
845 }
846 kfree(lra);
847
848 hashtab_map(&p->filename_trans, filenametr_destroy, NULL);
849 hashtab_destroy(&p->filename_trans);
850
851 hashtab_map(&p->range_tr, range_tr_destroy, NULL);
852 hashtab_destroy(&p->range_tr);
853
854 if (p->type_attr_map_array) {
855 for (i = 0; i < p->p_types.nprim; i++)
856 ebitmap_destroy(&p->type_attr_map_array[i]);
857 kvfree(p->type_attr_map_array);
858 }
859
860 ebitmap_destroy(&p->filename_trans_ttypes);
861 ebitmap_destroy(&p->policycaps);
862 ebitmap_destroy(&p->permissive_map);
863}
864
865/*
866 * Load the initial SIDs specified in a policy database
867 * structure into a SID table.
868 */
869int policydb_load_isids(struct policydb *p, struct sidtab *s)
870{
871 struct ocontext *head, *c;
872 int rc;
873
874 rc = sidtab_init(s);
875 if (rc) {
876 pr_err("SELinux: out of memory on SID table init\n");
877 goto out;
878 }
879
880 head = p->ocontexts[OCON_ISID];
881 for (c = head; c; c = c->next) {
882 u32 sid = c->sid[0];
883 const char *name = security_get_initial_sid_context(sid);
884
885 if (sid == SECSID_NULL) {
886 pr_err("SELinux: SID 0 was assigned a context.\n");
887 sidtab_destroy(s);
888 goto out;
889 }
890
891 /* Ignore initial SIDs unused by this kernel. */
892 if (!name)
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 goto out;
901 }
902 }
903 rc = 0;
904out:
905 return rc;
906}
907
908int policydb_class_isvalid(struct policydb *p, unsigned int class)
909{
910 if (!class || class > p->p_classes.nprim)
911 return 0;
912 return 1;
913}
914
915int policydb_role_isvalid(struct policydb *p, unsigned int role)
916{
917 if (!role || role > p->p_roles.nprim)
918 return 0;
919 return 1;
920}
921
922int policydb_type_isvalid(struct policydb *p, unsigned int type)
923{
924 if (!type || type > p->p_types.nprim)
925 return 0;
926 return 1;
927}
928
929/*
930 * Return 1 if the fields in the security context
931 * structure `c' are valid. Return 0 otherwise.
932 */
933int policydb_context_isvalid(struct policydb *p, struct context *c)
934{
935 struct role_datum *role;
936 struct user_datum *usrdatum;
937
938 if (!c->role || c->role > p->p_roles.nprim)
939 return 0;
940
941 if (!c->user || c->user > p->p_users.nprim)
942 return 0;
943
944 if (!c->type || c->type > p->p_types.nprim)
945 return 0;
946
947 if (c->role != OBJECT_R_VAL) {
948 /*
949 * Role must be authorized for the type.
950 */
951 role = p->role_val_to_struct[c->role - 1];
952 if (!role || !ebitmap_get_bit(&role->types, c->type - 1))
953 /* role may not be associated with type */
954 return 0;
955
956 /*
957 * User must be authorized for the role.
958 */
959 usrdatum = p->user_val_to_struct[c->user - 1];
960 if (!usrdatum)
961 return 0;
962
963 if (!ebitmap_get_bit(&usrdatum->roles, c->role - 1))
964 /* user may not be associated with role */
965 return 0;
966 }
967
968 if (!mls_context_isvalid(p, c))
969 return 0;
970
971 return 1;
972}
973
974/*
975 * Read a MLS range structure from a policydb binary
976 * representation file.
977 */
978static int mls_read_range_helper(struct mls_range *r, void *fp)
979{
980 __le32 buf[2];
981 u32 items;
982 int rc;
983
984 rc = next_entry(buf, fp, sizeof(u32));
985 if (rc)
986 goto out;
987
988 rc = -EINVAL;
989 items = le32_to_cpu(buf[0]);
990 if (items > ARRAY_SIZE(buf)) {
991 pr_err("SELinux: mls: range overflow\n");
992 goto out;
993 }
994
995 rc = next_entry(buf, fp, sizeof(u32) * items);
996 if (rc) {
997 pr_err("SELinux: mls: truncated range\n");
998 goto out;
999 }
1000
1001 r->level[0].sens = le32_to_cpu(buf[0]);
1002 if (items > 1)
1003 r->level[1].sens = le32_to_cpu(buf[1]);
1004 else
1005 r->level[1].sens = r->level[0].sens;
1006
1007 rc = ebitmap_read(&r->level[0].cat, fp);
1008 if (rc) {
1009 pr_err("SELinux: mls: error reading low categories\n");
1010 goto out;
1011 }
1012 if (items > 1) {
1013 rc = ebitmap_read(&r->level[1].cat, fp);
1014 if (rc) {
1015 pr_err("SELinux: mls: error reading high categories\n");
1016 goto bad_high;
1017 }
1018 } else {
1019 rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat);
1020 if (rc) {
1021 pr_err("SELinux: mls: out of memory\n");
1022 goto bad_high;
1023 }
1024 }
1025
1026 return 0;
1027bad_high:
1028 ebitmap_destroy(&r->level[0].cat);
1029out:
1030 return rc;
1031}
1032
1033/*
1034 * Read and validate a security context structure
1035 * from a policydb binary representation file.
1036 */
1037static int context_read_and_validate(struct context *c,
1038 struct policydb *p,
1039 void *fp)
1040{
1041 __le32 buf[3];
1042 int rc;
1043
1044 rc = next_entry(buf, fp, sizeof buf);
1045 if (rc) {
1046 pr_err("SELinux: context truncated\n");
1047 goto out;
1048 }
1049 c->user = le32_to_cpu(buf[0]);
1050 c->role = le32_to_cpu(buf[1]);
1051 c->type = le32_to_cpu(buf[2]);
1052 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1053 rc = mls_read_range_helper(&c->range, fp);
1054 if (rc) {
1055 pr_err("SELinux: error reading MLS range of context\n");
1056 goto out;
1057 }
1058 }
1059
1060 rc = -EINVAL;
1061 if (!policydb_context_isvalid(p, c)) {
1062 pr_err("SELinux: invalid security context\n");
1063 context_destroy(c);
1064 goto out;
1065 }
1066 rc = 0;
1067out:
1068 return rc;
1069}
1070
1071/*
1072 * The following *_read functions are used to
1073 * read the symbol data from a policy database
1074 * binary representation file.
1075 */
1076
1077static int str_read(char **strp, gfp_t flags, void *fp, u32 len)
1078{
1079 int rc;
1080 char *str;
1081
1082 if ((len == 0) || (len == (u32)-1))
1083 return -EINVAL;
1084
1085 str = kmalloc(len + 1, flags | __GFP_NOWARN);
1086 if (!str)
1087 return -ENOMEM;
1088
1089 rc = next_entry(str, fp, len);
1090 if (rc) {
1091 kfree(str);
1092 return rc;
1093 }
1094
1095 str[len] = '\0';
1096 *strp = str;
1097 return 0;
1098}
1099
1100static int perm_read(struct policydb *p, struct symtab *s, void *fp)
1101{
1102 char *key = NULL;
1103 struct perm_datum *perdatum;
1104 int rc;
1105 __le32 buf[2];
1106 u32 len;
1107
1108 perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
1109 if (!perdatum)
1110 return -ENOMEM;
1111
1112 rc = next_entry(buf, fp, sizeof buf);
1113 if (rc)
1114 goto bad;
1115
1116 len = le32_to_cpu(buf[0]);
1117 perdatum->value = le32_to_cpu(buf[1]);
1118
1119 rc = str_read(&key, GFP_KERNEL, fp, len);
1120 if (rc)
1121 goto bad;
1122
1123 rc = symtab_insert(s, key, perdatum);
1124 if (rc)
1125 goto bad;
1126
1127 return 0;
1128bad:
1129 perm_destroy(key, perdatum, NULL);
1130 return rc;
1131}
1132
1133static int common_read(struct policydb *p, struct symtab *s, void *fp)
1134{
1135 char *key = NULL;
1136 struct common_datum *comdatum;
1137 __le32 buf[4];
1138 u32 len, nel;
1139 int i, rc;
1140
1141 comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
1142 if (!comdatum)
1143 return -ENOMEM;
1144
1145 rc = next_entry(buf, fp, sizeof buf);
1146 if (rc)
1147 goto bad;
1148
1149 len = le32_to_cpu(buf[0]);
1150 comdatum->value = le32_to_cpu(buf[1]);
1151 nel = le32_to_cpu(buf[3]);
1152
1153 rc = symtab_init(&comdatum->permissions, nel);
1154 if (rc)
1155 goto bad;
1156 comdatum->permissions.nprim = le32_to_cpu(buf[2]);
1157
1158 rc = str_read(&key, GFP_KERNEL, fp, len);
1159 if (rc)
1160 goto bad;
1161
1162 for (i = 0; i < nel; i++) {
1163 rc = perm_read(p, &comdatum->permissions, fp);
1164 if (rc)
1165 goto bad;
1166 }
1167
1168 rc = symtab_insert(s, key, comdatum);
1169 if (rc)
1170 goto bad;
1171 return 0;
1172bad:
1173 common_destroy(key, comdatum, NULL);
1174 return rc;
1175}
1176
1177static void type_set_init(struct type_set *t)
1178{
1179 ebitmap_init(&t->types);
1180 ebitmap_init(&t->negset);
1181}
1182
1183static int type_set_read(struct type_set *t, void *fp)
1184{
1185 __le32 buf[1];
1186 int rc;
1187
1188 if (ebitmap_read(&t->types, fp))
1189 return -EINVAL;
1190 if (ebitmap_read(&t->negset, fp))
1191 return -EINVAL;
1192
1193 rc = next_entry(buf, fp, sizeof(u32));
1194 if (rc < 0)
1195 return -EINVAL;
1196 t->flags = le32_to_cpu(buf[0]);
1197
1198 return 0;
1199}
1200
1201
1202static int read_cons_helper(struct policydb *p,
1203 struct constraint_node **nodep,
1204 int ncons, int allowxtarget, void *fp)
1205{
1206 struct constraint_node *c, *lc;
1207 struct constraint_expr *e, *le;
1208 __le32 buf[3];
1209 u32 nexpr;
1210 int rc, i, j, depth;
1211
1212 lc = NULL;
1213 for (i = 0; i < ncons; i++) {
1214 c = kzalloc(sizeof(*c), GFP_KERNEL);
1215 if (!c)
1216 return -ENOMEM;
1217
1218 if (lc)
1219 lc->next = c;
1220 else
1221 *nodep = c;
1222
1223 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1224 if (rc)
1225 return rc;
1226 c->permissions = le32_to_cpu(buf[0]);
1227 nexpr = le32_to_cpu(buf[1]);
1228 le = NULL;
1229 depth = -1;
1230 for (j = 0; j < nexpr; j++) {
1231 e = kzalloc(sizeof(*e), GFP_KERNEL);
1232 if (!e)
1233 return -ENOMEM;
1234
1235 if (le)
1236 le->next = e;
1237 else
1238 c->expr = e;
1239
1240 rc = next_entry(buf, fp, (sizeof(u32) * 3));
1241 if (rc)
1242 return rc;
1243 e->expr_type = le32_to_cpu(buf[0]);
1244 e->attr = le32_to_cpu(buf[1]);
1245 e->op = le32_to_cpu(buf[2]);
1246
1247 switch (e->expr_type) {
1248 case CEXPR_NOT:
1249 if (depth < 0)
1250 return -EINVAL;
1251 break;
1252 case CEXPR_AND:
1253 case CEXPR_OR:
1254 if (depth < 1)
1255 return -EINVAL;
1256 depth--;
1257 break;
1258 case CEXPR_ATTR:
1259 if (depth == (CEXPR_MAXDEPTH - 1))
1260 return -EINVAL;
1261 depth++;
1262 break;
1263 case CEXPR_NAMES:
1264 if (!allowxtarget && (e->attr & CEXPR_XTARGET))
1265 return -EINVAL;
1266 if (depth == (CEXPR_MAXDEPTH - 1))
1267 return -EINVAL;
1268 depth++;
1269 rc = ebitmap_read(&e->names, fp);
1270 if (rc)
1271 return rc;
1272 if (p->policyvers >=
1273 POLICYDB_VERSION_CONSTRAINT_NAMES) {
1274 e->type_names = kzalloc(sizeof
1275 (*e->type_names), GFP_KERNEL);
1276 if (!e->type_names)
1277 return -ENOMEM;
1278 type_set_init(e->type_names);
1279 rc = type_set_read(e->type_names, fp);
1280 if (rc)
1281 return rc;
1282 }
1283 break;
1284 default:
1285 return -EINVAL;
1286 }
1287 le = e;
1288 }
1289 if (depth != 0)
1290 return -EINVAL;
1291 lc = c;
1292 }
1293
1294 return 0;
1295}
1296
1297static int class_read(struct policydb *p, struct symtab *s, void *fp)
1298{
1299 char *key = NULL;
1300 struct class_datum *cladatum;
1301 __le32 buf[6];
1302 u32 len, len2, ncons, nel;
1303 int i, rc;
1304
1305 cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
1306 if (!cladatum)
1307 return -ENOMEM;
1308
1309 rc = next_entry(buf, fp, sizeof(u32)*6);
1310 if (rc)
1311 goto bad;
1312
1313 len = le32_to_cpu(buf[0]);
1314 len2 = le32_to_cpu(buf[1]);
1315 cladatum->value = le32_to_cpu(buf[2]);
1316 nel = le32_to_cpu(buf[4]);
1317
1318 rc = symtab_init(&cladatum->permissions, nel);
1319 if (rc)
1320 goto bad;
1321 cladatum->permissions.nprim = le32_to_cpu(buf[3]);
1322
1323 ncons = le32_to_cpu(buf[5]);
1324
1325 rc = str_read(&key, GFP_KERNEL, fp, len);
1326 if (rc)
1327 goto bad;
1328
1329 if (len2) {
1330 rc = str_read(&cladatum->comkey, GFP_KERNEL, fp, len2);
1331 if (rc)
1332 goto bad;
1333
1334 rc = -EINVAL;
1335 cladatum->comdatum = symtab_search(&p->p_commons,
1336 cladatum->comkey);
1337 if (!cladatum->comdatum) {
1338 pr_err("SELinux: unknown common %s\n",
1339 cladatum->comkey);
1340 goto bad;
1341 }
1342 }
1343 for (i = 0; i < nel; i++) {
1344 rc = perm_read(p, &cladatum->permissions, fp);
1345 if (rc)
1346 goto bad;
1347 }
1348
1349 rc = read_cons_helper(p, &cladatum->constraints, ncons, 0, fp);
1350 if (rc)
1351 goto bad;
1352
1353 if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
1354 /* grab the validatetrans rules */
1355 rc = next_entry(buf, fp, sizeof(u32));
1356 if (rc)
1357 goto bad;
1358 ncons = le32_to_cpu(buf[0]);
1359 rc = read_cons_helper(p, &cladatum->validatetrans,
1360 ncons, 1, fp);
1361 if (rc)
1362 goto bad;
1363 }
1364
1365 if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
1366 rc = next_entry(buf, fp, sizeof(u32) * 3);
1367 if (rc)
1368 goto bad;
1369
1370 cladatum->default_user = le32_to_cpu(buf[0]);
1371 cladatum->default_role = le32_to_cpu(buf[1]);
1372 cladatum->default_range = le32_to_cpu(buf[2]);
1373 }
1374
1375 if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
1376 rc = next_entry(buf, fp, sizeof(u32) * 1);
1377 if (rc)
1378 goto bad;
1379 cladatum->default_type = le32_to_cpu(buf[0]);
1380 }
1381
1382 rc = symtab_insert(s, key, cladatum);
1383 if (rc)
1384 goto bad;
1385
1386 return 0;
1387bad:
1388 cls_destroy(key, cladatum, NULL);
1389 return rc;
1390}
1391
1392static int role_read(struct policydb *p, struct symtab *s, void *fp)
1393{
1394 char *key = NULL;
1395 struct role_datum *role;
1396 int rc, to_read = 2;
1397 __le32 buf[3];
1398 u32 len;
1399
1400 role = kzalloc(sizeof(*role), GFP_KERNEL);
1401 if (!role)
1402 return -ENOMEM;
1403
1404 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1405 to_read = 3;
1406
1407 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1408 if (rc)
1409 goto bad;
1410
1411 len = le32_to_cpu(buf[0]);
1412 role->value = le32_to_cpu(buf[1]);
1413 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1414 role->bounds = le32_to_cpu(buf[2]);
1415
1416 rc = str_read(&key, GFP_KERNEL, fp, len);
1417 if (rc)
1418 goto bad;
1419
1420 rc = ebitmap_read(&role->dominates, fp);
1421 if (rc)
1422 goto bad;
1423
1424 rc = ebitmap_read(&role->types, fp);
1425 if (rc)
1426 goto bad;
1427
1428 if (strcmp(key, OBJECT_R) == 0) {
1429 rc = -EINVAL;
1430 if (role->value != OBJECT_R_VAL) {
1431 pr_err("SELinux: Role %s has wrong value %d\n",
1432 OBJECT_R, role->value);
1433 goto bad;
1434 }
1435 rc = 0;
1436 goto bad;
1437 }
1438
1439 rc = symtab_insert(s, key, role);
1440 if (rc)
1441 goto bad;
1442 return 0;
1443bad:
1444 role_destroy(key, role, NULL);
1445 return rc;
1446}
1447
1448static int type_read(struct policydb *p, struct symtab *s, void *fp)
1449{
1450 char *key = NULL;
1451 struct type_datum *typdatum;
1452 int rc, to_read = 3;
1453 __le32 buf[4];
1454 u32 len;
1455
1456 typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL);
1457 if (!typdatum)
1458 return -ENOMEM;
1459
1460 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1461 to_read = 4;
1462
1463 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1464 if (rc)
1465 goto bad;
1466
1467 len = le32_to_cpu(buf[0]);
1468 typdatum->value = le32_to_cpu(buf[1]);
1469 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
1470 u32 prop = le32_to_cpu(buf[2]);
1471
1472 if (prop & TYPEDATUM_PROPERTY_PRIMARY)
1473 typdatum->primary = 1;
1474 if (prop & TYPEDATUM_PROPERTY_ATTRIBUTE)
1475 typdatum->attribute = 1;
1476
1477 typdatum->bounds = le32_to_cpu(buf[3]);
1478 } else {
1479 typdatum->primary = le32_to_cpu(buf[2]);
1480 }
1481
1482 rc = str_read(&key, GFP_KERNEL, fp, len);
1483 if (rc)
1484 goto bad;
1485
1486 rc = symtab_insert(s, key, typdatum);
1487 if (rc)
1488 goto bad;
1489 return 0;
1490bad:
1491 type_destroy(key, typdatum, NULL);
1492 return rc;
1493}
1494
1495
1496/*
1497 * Read a MLS level structure from a policydb binary
1498 * representation file.
1499 */
1500static int mls_read_level(struct mls_level *lp, void *fp)
1501{
1502 __le32 buf[1];
1503 int rc;
1504
1505 memset(lp, 0, sizeof(*lp));
1506
1507 rc = next_entry(buf, fp, sizeof buf);
1508 if (rc) {
1509 pr_err("SELinux: mls: truncated level\n");
1510 return rc;
1511 }
1512 lp->sens = le32_to_cpu(buf[0]);
1513
1514 rc = ebitmap_read(&lp->cat, fp);
1515 if (rc) {
1516 pr_err("SELinux: mls: error reading level categories\n");
1517 return rc;
1518 }
1519 return 0;
1520}
1521
1522static int user_read(struct policydb *p, struct symtab *s, void *fp)
1523{
1524 char *key = NULL;
1525 struct user_datum *usrdatum;
1526 int rc, to_read = 2;
1527 __le32 buf[3];
1528 u32 len;
1529
1530 usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
1531 if (!usrdatum)
1532 return -ENOMEM;
1533
1534 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1535 to_read = 3;
1536
1537 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1538 if (rc)
1539 goto bad;
1540
1541 len = le32_to_cpu(buf[0]);
1542 usrdatum->value = le32_to_cpu(buf[1]);
1543 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1544 usrdatum->bounds = le32_to_cpu(buf[2]);
1545
1546 rc = str_read(&key, GFP_KERNEL, fp, len);
1547 if (rc)
1548 goto bad;
1549
1550 rc = ebitmap_read(&usrdatum->roles, fp);
1551 if (rc)
1552 goto bad;
1553
1554 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1555 rc = mls_read_range_helper(&usrdatum->range, fp);
1556 if (rc)
1557 goto bad;
1558 rc = mls_read_level(&usrdatum->dfltlevel, fp);
1559 if (rc)
1560 goto bad;
1561 }
1562
1563 rc = symtab_insert(s, key, usrdatum);
1564 if (rc)
1565 goto bad;
1566 return 0;
1567bad:
1568 user_destroy(key, usrdatum, NULL);
1569 return rc;
1570}
1571
1572static int sens_read(struct policydb *p, struct symtab *s, void *fp)
1573{
1574 char *key = NULL;
1575 struct level_datum *levdatum;
1576 int rc;
1577 __le32 buf[2];
1578 u32 len;
1579
1580 levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC);
1581 if (!levdatum)
1582 return -ENOMEM;
1583
1584 rc = next_entry(buf, fp, sizeof buf);
1585 if (rc)
1586 goto bad;
1587
1588 len = le32_to_cpu(buf[0]);
1589 levdatum->isalias = le32_to_cpu(buf[1]);
1590
1591 rc = str_read(&key, GFP_ATOMIC, fp, len);
1592 if (rc)
1593 goto bad;
1594
1595 rc = -ENOMEM;
1596 levdatum->level = kmalloc(sizeof(*levdatum->level), GFP_ATOMIC);
1597 if (!levdatum->level)
1598 goto bad;
1599
1600 rc = mls_read_level(levdatum->level, fp);
1601 if (rc)
1602 goto bad;
1603
1604 rc = symtab_insert(s, key, levdatum);
1605 if (rc)
1606 goto bad;
1607 return 0;
1608bad:
1609 sens_destroy(key, levdatum, NULL);
1610 return rc;
1611}
1612
1613static int cat_read(struct policydb *p, struct symtab *s, void *fp)
1614{
1615 char *key = NULL;
1616 struct cat_datum *catdatum;
1617 int rc;
1618 __le32 buf[3];
1619 u32 len;
1620
1621 catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC);
1622 if (!catdatum)
1623 return -ENOMEM;
1624
1625 rc = next_entry(buf, fp, sizeof buf);
1626 if (rc)
1627 goto bad;
1628
1629 len = le32_to_cpu(buf[0]);
1630 catdatum->value = le32_to_cpu(buf[1]);
1631 catdatum->isalias = le32_to_cpu(buf[2]);
1632
1633 rc = str_read(&key, GFP_ATOMIC, fp, len);
1634 if (rc)
1635 goto bad;
1636
1637 rc = symtab_insert(s, key, catdatum);
1638 if (rc)
1639 goto bad;
1640 return 0;
1641bad:
1642 cat_destroy(key, catdatum, NULL);
1643 return rc;
1644}
1645
1646static int (*read_f[SYM_NUM]) (struct policydb *p, struct symtab *s, void *fp) =
1647{
1648 common_read,
1649 class_read,
1650 role_read,
1651 type_read,
1652 user_read,
1653 cond_read_bool,
1654 sens_read,
1655 cat_read,
1656};
1657
1658static int user_bounds_sanity_check(void *key, void *datum, void *datap)
1659{
1660 struct user_datum *upper, *user;
1661 struct policydb *p = datap;
1662 int depth = 0;
1663
1664 upper = user = datum;
1665 while (upper->bounds) {
1666 struct ebitmap_node *node;
1667 unsigned long bit;
1668
1669 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1670 pr_err("SELinux: user %s: "
1671 "too deep or looped boundary",
1672 (char *) key);
1673 return -EINVAL;
1674 }
1675
1676 upper = p->user_val_to_struct[upper->bounds - 1];
1677 ebitmap_for_each_positive_bit(&user->roles, node, bit) {
1678 if (ebitmap_get_bit(&upper->roles, bit))
1679 continue;
1680
1681 pr_err("SELinux: boundary violated policy: "
1682 "user=%s role=%s bounds=%s\n",
1683 sym_name(p, SYM_USERS, user->value - 1),
1684 sym_name(p, SYM_ROLES, bit),
1685 sym_name(p, SYM_USERS, upper->value - 1));
1686
1687 return -EINVAL;
1688 }
1689 }
1690
1691 return 0;
1692}
1693
1694static int role_bounds_sanity_check(void *key, void *datum, void *datap)
1695{
1696 struct role_datum *upper, *role;
1697 struct policydb *p = datap;
1698 int depth = 0;
1699
1700 upper = role = datum;
1701 while (upper->bounds) {
1702 struct ebitmap_node *node;
1703 unsigned long bit;
1704
1705 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1706 pr_err("SELinux: role %s: "
1707 "too deep or looped bounds\n",
1708 (char *) key);
1709 return -EINVAL;
1710 }
1711
1712 upper = p->role_val_to_struct[upper->bounds - 1];
1713 ebitmap_for_each_positive_bit(&role->types, node, bit) {
1714 if (ebitmap_get_bit(&upper->types, bit))
1715 continue;
1716
1717 pr_err("SELinux: boundary violated policy: "
1718 "role=%s type=%s bounds=%s\n",
1719 sym_name(p, SYM_ROLES, role->value - 1),
1720 sym_name(p, SYM_TYPES, bit),
1721 sym_name(p, SYM_ROLES, upper->value - 1));
1722
1723 return -EINVAL;
1724 }
1725 }
1726
1727 return 0;
1728}
1729
1730static int type_bounds_sanity_check(void *key, void *datum, void *datap)
1731{
1732 struct type_datum *upper;
1733 struct policydb *p = datap;
1734 int depth = 0;
1735
1736 upper = datum;
1737 while (upper->bounds) {
1738 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1739 pr_err("SELinux: type %s: "
1740 "too deep or looped boundary\n",
1741 (char *) key);
1742 return -EINVAL;
1743 }
1744
1745 upper = p->type_val_to_struct[upper->bounds - 1];
1746 BUG_ON(!upper);
1747
1748 if (upper->attribute) {
1749 pr_err("SELinux: type %s: "
1750 "bounded by attribute %s",
1751 (char *) key,
1752 sym_name(p, SYM_TYPES, upper->value - 1));
1753 return -EINVAL;
1754 }
1755 }
1756
1757 return 0;
1758}
1759
1760static int policydb_bounds_sanity_check(struct policydb *p)
1761{
1762 int rc;
1763
1764 if (p->policyvers < POLICYDB_VERSION_BOUNDARY)
1765 return 0;
1766
1767 rc = hashtab_map(&p->p_users.table, user_bounds_sanity_check, p);
1768 if (rc)
1769 return rc;
1770
1771 rc = hashtab_map(&p->p_roles.table, role_bounds_sanity_check, p);
1772 if (rc)
1773 return rc;
1774
1775 rc = hashtab_map(&p->p_types.table, type_bounds_sanity_check, p);
1776 if (rc)
1777 return rc;
1778
1779 return 0;
1780}
1781
1782u16 string_to_security_class(struct policydb *p, const char *name)
1783{
1784 struct class_datum *cladatum;
1785
1786 cladatum = symtab_search(&p->p_classes, name);
1787 if (!cladatum)
1788 return 0;
1789
1790 return cladatum->value;
1791}
1792
1793u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name)
1794{
1795 struct class_datum *cladatum;
1796 struct perm_datum *perdatum = NULL;
1797 struct common_datum *comdatum;
1798
1799 if (!tclass || tclass > p->p_classes.nprim)
1800 return 0;
1801
1802 cladatum = p->class_val_to_struct[tclass-1];
1803 comdatum = cladatum->comdatum;
1804 if (comdatum)
1805 perdatum = symtab_search(&comdatum->permissions, name);
1806 if (!perdatum)
1807 perdatum = symtab_search(&cladatum->permissions, name);
1808 if (!perdatum)
1809 return 0;
1810
1811 return 1U << (perdatum->value-1);
1812}
1813
1814static int range_read(struct policydb *p, void *fp)
1815{
1816 struct range_trans *rt = NULL;
1817 struct mls_range *r = NULL;
1818 int i, rc;
1819 __le32 buf[2];
1820 u32 nel;
1821
1822 if (p->policyvers < POLICYDB_VERSION_MLS)
1823 return 0;
1824
1825 rc = next_entry(buf, fp, sizeof(u32));
1826 if (rc)
1827 return rc;
1828
1829 nel = le32_to_cpu(buf[0]);
1830
1831 rc = hashtab_init(&p->range_tr, nel);
1832 if (rc)
1833 return rc;
1834
1835 for (i = 0; i < nel; i++) {
1836 rc = -ENOMEM;
1837 rt = kzalloc(sizeof(*rt), GFP_KERNEL);
1838 if (!rt)
1839 goto out;
1840
1841 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1842 if (rc)
1843 goto out;
1844
1845 rt->source_type = le32_to_cpu(buf[0]);
1846 rt->target_type = le32_to_cpu(buf[1]);
1847 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
1848 rc = next_entry(buf, fp, sizeof(u32));
1849 if (rc)
1850 goto out;
1851 rt->target_class = le32_to_cpu(buf[0]);
1852 } else
1853 rt->target_class = p->process_class;
1854
1855 rc = -EINVAL;
1856 if (!policydb_type_isvalid(p, rt->source_type) ||
1857 !policydb_type_isvalid(p, rt->target_type) ||
1858 !policydb_class_isvalid(p, rt->target_class))
1859 goto out;
1860
1861 rc = -ENOMEM;
1862 r = kzalloc(sizeof(*r), GFP_KERNEL);
1863 if (!r)
1864 goto out;
1865
1866 rc = mls_read_range_helper(r, fp);
1867 if (rc)
1868 goto out;
1869
1870 rc = -EINVAL;
1871 if (!mls_range_isvalid(p, r)) {
1872 pr_warn("SELinux: rangetrans: invalid range\n");
1873 goto out;
1874 }
1875
1876 rc = hashtab_insert(&p->range_tr, rt, r, rangetr_key_params);
1877 if (rc)
1878 goto out;
1879
1880 rt = NULL;
1881 r = NULL;
1882 }
1883 hash_eval(&p->range_tr, "rangetr");
1884 rc = 0;
1885out:
1886 kfree(rt);
1887 kfree(r);
1888 return rc;
1889}
1890
1891static int filename_trans_read_helper_compat(struct policydb *p, void *fp)
1892{
1893 struct filename_trans_key key, *ft = NULL;
1894 struct filename_trans_datum *last, *datum = NULL;
1895 char *name = NULL;
1896 u32 len, stype, otype;
1897 __le32 buf[4];
1898 int rc;
1899
1900 /* length of the path component string */
1901 rc = next_entry(buf, fp, sizeof(u32));
1902 if (rc)
1903 return rc;
1904 len = le32_to_cpu(buf[0]);
1905
1906 /* path component string */
1907 rc = str_read(&name, GFP_KERNEL, fp, len);
1908 if (rc)
1909 return rc;
1910
1911 rc = next_entry(buf, fp, sizeof(u32) * 4);
1912 if (rc)
1913 goto out;
1914
1915 stype = le32_to_cpu(buf[0]);
1916 key.ttype = le32_to_cpu(buf[1]);
1917 key.tclass = le32_to_cpu(buf[2]);
1918 key.name = name;
1919
1920 otype = le32_to_cpu(buf[3]);
1921
1922 last = NULL;
1923 datum = policydb_filenametr_search(p, &key);
1924 while (datum) {
1925 if (unlikely(ebitmap_get_bit(&datum->stypes, stype - 1))) {
1926 /* conflicting/duplicate rules are ignored */
1927 datum = NULL;
1928 goto out;
1929 }
1930 if (likely(datum->otype == otype))
1931 break;
1932 last = datum;
1933 datum = datum->next;
1934 }
1935 if (!datum) {
1936 rc = -ENOMEM;
1937 datum = kmalloc(sizeof(*datum), GFP_KERNEL);
1938 if (!datum)
1939 goto out;
1940
1941 ebitmap_init(&datum->stypes);
1942 datum->otype = otype;
1943 datum->next = NULL;
1944
1945 if (unlikely(last)) {
1946 last->next = datum;
1947 } else {
1948 rc = -ENOMEM;
1949 ft = kmemdup(&key, sizeof(key), GFP_KERNEL);
1950 if (!ft)
1951 goto out;
1952
1953 rc = hashtab_insert(&p->filename_trans, ft, datum,
1954 filenametr_key_params);
1955 if (rc)
1956 goto out;
1957 name = NULL;
1958
1959 rc = ebitmap_set_bit(&p->filename_trans_ttypes,
1960 key.ttype, 1);
1961 if (rc)
1962 return rc;
1963 }
1964 }
1965 kfree(name);
1966 return ebitmap_set_bit(&datum->stypes, stype - 1, 1);
1967
1968out:
1969 kfree(ft);
1970 kfree(name);
1971 kfree(datum);
1972 return rc;
1973}
1974
1975static int filename_trans_read_helper(struct policydb *p, void *fp)
1976{
1977 struct filename_trans_key *ft = NULL;
1978 struct filename_trans_datum **dst, *datum, *first = NULL;
1979 char *name = NULL;
1980 u32 len, ttype, tclass, ndatum, i;
1981 __le32 buf[3];
1982 int rc;
1983
1984 /* length of the path component string */
1985 rc = next_entry(buf, fp, sizeof(u32));
1986 if (rc)
1987 return rc;
1988 len = le32_to_cpu(buf[0]);
1989
1990 /* path component string */
1991 rc = str_read(&name, GFP_KERNEL, fp, len);
1992 if (rc)
1993 return rc;
1994
1995 rc = next_entry(buf, fp, sizeof(u32) * 3);
1996 if (rc)
1997 goto out;
1998
1999 ttype = le32_to_cpu(buf[0]);
2000 tclass = le32_to_cpu(buf[1]);
2001
2002 ndatum = le32_to_cpu(buf[2]);
2003 if (ndatum == 0) {
2004 pr_err("SELinux: Filename transition key with no datum\n");
2005 rc = -ENOENT;
2006 goto out;
2007 }
2008
2009 dst = &first;
2010 for (i = 0; i < ndatum; i++) {
2011 rc = -ENOMEM;
2012 datum = kmalloc(sizeof(*datum), GFP_KERNEL);
2013 if (!datum)
2014 goto out;
2015
2016 *dst = datum;
2017
2018 /* ebitmap_read() will at least init the bitmap */
2019 rc = ebitmap_read(&datum->stypes, fp);
2020 if (rc)
2021 goto out;
2022
2023 rc = next_entry(buf, fp, sizeof(u32));
2024 if (rc)
2025 goto out;
2026
2027 datum->otype = le32_to_cpu(buf[0]);
2028 datum->next = NULL;
2029
2030 dst = &datum->next;
2031 }
2032
2033 rc = -ENOMEM;
2034 ft = kmalloc(sizeof(*ft), GFP_KERNEL);
2035 if (!ft)
2036 goto out;
2037
2038 ft->ttype = ttype;
2039 ft->tclass = tclass;
2040 ft->name = name;
2041
2042 rc = hashtab_insert(&p->filename_trans, ft, first,
2043 filenametr_key_params);
2044 if (rc == -EEXIST)
2045 pr_err("SELinux: Duplicate filename transition key\n");
2046 if (rc)
2047 goto out;
2048
2049 return ebitmap_set_bit(&p->filename_trans_ttypes, ttype, 1);
2050
2051out:
2052 kfree(ft);
2053 kfree(name);
2054 while (first) {
2055 datum = first;
2056 first = first->next;
2057
2058 ebitmap_destroy(&datum->stypes);
2059 kfree(datum);
2060 }
2061 return rc;
2062}
2063
2064static int filename_trans_read(struct policydb *p, void *fp)
2065{
2066 u32 nel;
2067 __le32 buf[1];
2068 int rc, i;
2069
2070 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
2071 return 0;
2072
2073 rc = next_entry(buf, fp, sizeof(u32));
2074 if (rc)
2075 return rc;
2076 nel = le32_to_cpu(buf[0]);
2077
2078 if (p->policyvers < POLICYDB_VERSION_COMP_FTRANS) {
2079 p->compat_filename_trans_count = nel;
2080
2081 rc = hashtab_init(&p->filename_trans, (1 << 11));
2082 if (rc)
2083 return rc;
2084
2085 for (i = 0; i < nel; i++) {
2086 rc = filename_trans_read_helper_compat(p, fp);
2087 if (rc)
2088 return rc;
2089 }
2090 } else {
2091 rc = hashtab_init(&p->filename_trans, nel);
2092 if (rc)
2093 return rc;
2094
2095 for (i = 0; i < nel; i++) {
2096 rc = filename_trans_read_helper(p, fp);
2097 if (rc)
2098 return rc;
2099 }
2100 }
2101 hash_eval(&p->filename_trans, "filenametr");
2102 return 0;
2103}
2104
2105static int genfs_read(struct policydb *p, void *fp)
2106{
2107 int i, j, rc;
2108 u32 nel, nel2, len, len2;
2109 __le32 buf[1];
2110 struct ocontext *l, *c;
2111 struct ocontext *newc = NULL;
2112 struct genfs *genfs_p, *genfs;
2113 struct genfs *newgenfs = NULL;
2114
2115 rc = next_entry(buf, fp, sizeof(u32));
2116 if (rc)
2117 return rc;
2118 nel = le32_to_cpu(buf[0]);
2119
2120 for (i = 0; i < nel; i++) {
2121 rc = next_entry(buf, fp, sizeof(u32));
2122 if (rc)
2123 goto out;
2124 len = le32_to_cpu(buf[0]);
2125
2126 rc = -ENOMEM;
2127 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
2128 if (!newgenfs)
2129 goto out;
2130
2131 rc = str_read(&newgenfs->fstype, GFP_KERNEL, fp, len);
2132 if (rc)
2133 goto out;
2134
2135 for (genfs_p = NULL, genfs = p->genfs; genfs;
2136 genfs_p = genfs, genfs = genfs->next) {
2137 rc = -EINVAL;
2138 if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
2139 pr_err("SELinux: dup genfs fstype %s\n",
2140 newgenfs->fstype);
2141 goto out;
2142 }
2143 if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
2144 break;
2145 }
2146 newgenfs->next = genfs;
2147 if (genfs_p)
2148 genfs_p->next = newgenfs;
2149 else
2150 p->genfs = newgenfs;
2151 genfs = newgenfs;
2152 newgenfs = NULL;
2153
2154 rc = next_entry(buf, fp, sizeof(u32));
2155 if (rc)
2156 goto out;
2157
2158 nel2 = le32_to_cpu(buf[0]);
2159 for (j = 0; j < nel2; j++) {
2160 rc = next_entry(buf, fp, sizeof(u32));
2161 if (rc)
2162 goto out;
2163 len = le32_to_cpu(buf[0]);
2164
2165 rc = -ENOMEM;
2166 newc = kzalloc(sizeof(*newc), GFP_KERNEL);
2167 if (!newc)
2168 goto out;
2169
2170 rc = str_read(&newc->u.name, GFP_KERNEL, fp, len);
2171 if (rc)
2172 goto out;
2173
2174 rc = next_entry(buf, fp, sizeof(u32));
2175 if (rc)
2176 goto out;
2177
2178 newc->v.sclass = le32_to_cpu(buf[0]);
2179 rc = context_read_and_validate(&newc->context[0], p, fp);
2180 if (rc)
2181 goto out;
2182
2183 for (l = NULL, c = genfs->head; c;
2184 l = c, c = c->next) {
2185 rc = -EINVAL;
2186 if (!strcmp(newc->u.name, c->u.name) &&
2187 (!c->v.sclass || !newc->v.sclass ||
2188 newc->v.sclass == c->v.sclass)) {
2189 pr_err("SELinux: dup genfs entry (%s,%s)\n",
2190 genfs->fstype, c->u.name);
2191 goto out;
2192 }
2193 len = strlen(newc->u.name);
2194 len2 = strlen(c->u.name);
2195 if (len > len2)
2196 break;
2197 }
2198
2199 newc->next = c;
2200 if (l)
2201 l->next = newc;
2202 else
2203 genfs->head = newc;
2204 newc = NULL;
2205 }
2206 }
2207 rc = 0;
2208out:
2209 if (newgenfs) {
2210 kfree(newgenfs->fstype);
2211 kfree(newgenfs);
2212 }
2213 ocontext_destroy(newc, OCON_FSUSE);
2214
2215 return rc;
2216}
2217
2218static int ocontext_read(struct policydb *p, struct policydb_compat_info *info,
2219 void *fp)
2220{
2221 int i, j, rc;
2222 u32 nel, len;
2223 __be64 prefixbuf[1];
2224 __le32 buf[3];
2225 struct ocontext *l, *c;
2226 u32 nodebuf[8];
2227
2228 for (i = 0; i < info->ocon_num; i++) {
2229 rc = next_entry(buf, fp, sizeof(u32));
2230 if (rc)
2231 goto out;
2232 nel = le32_to_cpu(buf[0]);
2233
2234 l = NULL;
2235 for (j = 0; j < nel; j++) {
2236 rc = -ENOMEM;
2237 c = kzalloc(sizeof(*c), GFP_KERNEL);
2238 if (!c)
2239 goto out;
2240 if (l)
2241 l->next = c;
2242 else
2243 p->ocontexts[i] = c;
2244 l = c;
2245
2246 switch (i) {
2247 case OCON_ISID:
2248 rc = next_entry(buf, fp, sizeof(u32));
2249 if (rc)
2250 goto out;
2251
2252 c->sid[0] = le32_to_cpu(buf[0]);
2253 rc = context_read_and_validate(&c->context[0], p, fp);
2254 if (rc)
2255 goto out;
2256 break;
2257 case OCON_FS:
2258 case OCON_NETIF:
2259 rc = next_entry(buf, fp, sizeof(u32));
2260 if (rc)
2261 goto out;
2262 len = le32_to_cpu(buf[0]);
2263
2264 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2265 if (rc)
2266 goto out;
2267
2268 rc = context_read_and_validate(&c->context[0], p, fp);
2269 if (rc)
2270 goto out;
2271 rc = context_read_and_validate(&c->context[1], p, fp);
2272 if (rc)
2273 goto out;
2274 break;
2275 case OCON_PORT:
2276 rc = next_entry(buf, fp, sizeof(u32)*3);
2277 if (rc)
2278 goto out;
2279 c->u.port.protocol = le32_to_cpu(buf[0]);
2280 c->u.port.low_port = le32_to_cpu(buf[1]);
2281 c->u.port.high_port = le32_to_cpu(buf[2]);
2282 rc = context_read_and_validate(&c->context[0], p, fp);
2283 if (rc)
2284 goto out;
2285 break;
2286 case OCON_NODE:
2287 rc = next_entry(nodebuf, fp, sizeof(u32) * 2);
2288 if (rc)
2289 goto out;
2290 c->u.node.addr = nodebuf[0]; /* network order */
2291 c->u.node.mask = nodebuf[1]; /* network order */
2292 rc = context_read_and_validate(&c->context[0], p, fp);
2293 if (rc)
2294 goto out;
2295 break;
2296 case OCON_FSUSE:
2297 rc = next_entry(buf, fp, sizeof(u32)*2);
2298 if (rc)
2299 goto out;
2300
2301 rc = -EINVAL;
2302 c->v.behavior = le32_to_cpu(buf[0]);
2303 /* Determined at runtime, not in policy DB. */
2304 if (c->v.behavior == SECURITY_FS_USE_MNTPOINT)
2305 goto out;
2306 if (c->v.behavior > SECURITY_FS_USE_MAX)
2307 goto out;
2308
2309 len = le32_to_cpu(buf[1]);
2310 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2311 if (rc)
2312 goto out;
2313
2314 rc = context_read_and_validate(&c->context[0], p, fp);
2315 if (rc)
2316 goto out;
2317 break;
2318 case OCON_NODE6: {
2319 int k;
2320
2321 rc = next_entry(nodebuf, fp, sizeof(u32) * 8);
2322 if (rc)
2323 goto out;
2324 for (k = 0; k < 4; k++)
2325 c->u.node6.addr[k] = nodebuf[k];
2326 for (k = 0; k < 4; k++)
2327 c->u.node6.mask[k] = nodebuf[k+4];
2328 rc = context_read_and_validate(&c->context[0], p, fp);
2329 if (rc)
2330 goto out;
2331 break;
2332 }
2333 case OCON_IBPKEY: {
2334 u32 pkey_lo, pkey_hi;
2335
2336 rc = next_entry(prefixbuf, fp, sizeof(u64));
2337 if (rc)
2338 goto out;
2339
2340 /* we need to have subnet_prefix in CPU order */
2341 c->u.ibpkey.subnet_prefix = be64_to_cpu(prefixbuf[0]);
2342
2343 rc = next_entry(buf, fp, sizeof(u32) * 2);
2344 if (rc)
2345 goto out;
2346
2347 pkey_lo = le32_to_cpu(buf[0]);
2348 pkey_hi = le32_to_cpu(buf[1]);
2349
2350 if (pkey_lo > U16_MAX || pkey_hi > U16_MAX) {
2351 rc = -EINVAL;
2352 goto out;
2353 }
2354
2355 c->u.ibpkey.low_pkey = pkey_lo;
2356 c->u.ibpkey.high_pkey = pkey_hi;
2357
2358 rc = context_read_and_validate(&c->context[0],
2359 p,
2360 fp);
2361 if (rc)
2362 goto out;
2363 break;
2364 }
2365 case OCON_IBENDPORT: {
2366 u32 port;
2367
2368 rc = next_entry(buf, fp, sizeof(u32) * 2);
2369 if (rc)
2370 goto out;
2371 len = le32_to_cpu(buf[0]);
2372
2373 rc = str_read(&c->u.ibendport.dev_name, GFP_KERNEL, fp, len);
2374 if (rc)
2375 goto out;
2376
2377 port = le32_to_cpu(buf[1]);
2378 if (port > U8_MAX || port == 0) {
2379 rc = -EINVAL;
2380 goto out;
2381 }
2382
2383 c->u.ibendport.port = port;
2384
2385 rc = context_read_and_validate(&c->context[0],
2386 p,
2387 fp);
2388 if (rc)
2389 goto out;
2390 break;
2391 } /* end case */
2392 } /* end switch */
2393 }
2394 }
2395 rc = 0;
2396out:
2397 return rc;
2398}
2399
2400/*
2401 * Read the configuration data from a policy database binary
2402 * representation file into a policy database structure.
2403 */
2404int policydb_read(struct policydb *p, void *fp)
2405{
2406 struct role_allow *ra, *lra;
2407 struct role_trans_key *rtk = NULL;
2408 struct role_trans_datum *rtd = NULL;
2409 int i, j, rc;
2410 __le32 buf[4];
2411 u32 len, nprim, nel, perm;
2412
2413 char *policydb_str;
2414 struct policydb_compat_info *info;
2415
2416 policydb_init(p);
2417
2418 /* Read the magic number and string length. */
2419 rc = next_entry(buf, fp, sizeof(u32) * 2);
2420 if (rc)
2421 goto bad;
2422
2423 rc = -EINVAL;
2424 if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
2425 pr_err("SELinux: policydb magic number 0x%x does "
2426 "not match expected magic number 0x%x\n",
2427 le32_to_cpu(buf[0]), POLICYDB_MAGIC);
2428 goto bad;
2429 }
2430
2431 rc = -EINVAL;
2432 len = le32_to_cpu(buf[1]);
2433 if (len != strlen(POLICYDB_STRING)) {
2434 pr_err("SELinux: policydb string length %d does not "
2435 "match expected length %zu\n",
2436 len, strlen(POLICYDB_STRING));
2437 goto bad;
2438 }
2439
2440 rc = -ENOMEM;
2441 policydb_str = kmalloc(len + 1, GFP_KERNEL);
2442 if (!policydb_str) {
2443 pr_err("SELinux: unable to allocate memory for policydb "
2444 "string of length %d\n", len);
2445 goto bad;
2446 }
2447
2448 rc = next_entry(policydb_str, fp, len);
2449 if (rc) {
2450 pr_err("SELinux: truncated policydb string identifier\n");
2451 kfree(policydb_str);
2452 goto bad;
2453 }
2454
2455 rc = -EINVAL;
2456 policydb_str[len] = '\0';
2457 if (strcmp(policydb_str, POLICYDB_STRING)) {
2458 pr_err("SELinux: policydb string %s does not match "
2459 "my string %s\n", policydb_str, POLICYDB_STRING);
2460 kfree(policydb_str);
2461 goto bad;
2462 }
2463 /* Done with policydb_str. */
2464 kfree(policydb_str);
2465 policydb_str = NULL;
2466
2467 /* Read the version and table sizes. */
2468 rc = next_entry(buf, fp, sizeof(u32)*4);
2469 if (rc)
2470 goto bad;
2471
2472 rc = -EINVAL;
2473 p->policyvers = le32_to_cpu(buf[0]);
2474 if (p->policyvers < POLICYDB_VERSION_MIN ||
2475 p->policyvers > POLICYDB_VERSION_MAX) {
2476 pr_err("SELinux: policydb version %d does not match "
2477 "my version range %d-%d\n",
2478 le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
2479 goto bad;
2480 }
2481
2482 if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
2483 p->mls_enabled = 1;
2484
2485 rc = -EINVAL;
2486 if (p->policyvers < POLICYDB_VERSION_MLS) {
2487 pr_err("SELinux: security policydb version %d "
2488 "(MLS) not backwards compatible\n",
2489 p->policyvers);
2490 goto bad;
2491 }
2492 }
2493 p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
2494 p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
2495
2496 if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
2497 rc = ebitmap_read(&p->policycaps, fp);
2498 if (rc)
2499 goto bad;
2500 }
2501
2502 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
2503 rc = ebitmap_read(&p->permissive_map, fp);
2504 if (rc)
2505 goto bad;
2506 }
2507
2508 rc = -EINVAL;
2509 info = policydb_lookup_compat(p->policyvers);
2510 if (!info) {
2511 pr_err("SELinux: unable to find policy compat info "
2512 "for version %d\n", p->policyvers);
2513 goto bad;
2514 }
2515
2516 rc = -EINVAL;
2517 if (le32_to_cpu(buf[2]) != info->sym_num ||
2518 le32_to_cpu(buf[3]) != info->ocon_num) {
2519 pr_err("SELinux: policydb table sizes (%d,%d) do "
2520 "not match mine (%d,%d)\n", le32_to_cpu(buf[2]),
2521 le32_to_cpu(buf[3]),
2522 info->sym_num, info->ocon_num);
2523 goto bad;
2524 }
2525
2526 for (i = 0; i < info->sym_num; i++) {
2527 rc = next_entry(buf, fp, sizeof(u32)*2);
2528 if (rc)
2529 goto bad;
2530 nprim = le32_to_cpu(buf[0]);
2531 nel = le32_to_cpu(buf[1]);
2532
2533 rc = symtab_init(&p->symtab[i], nel);
2534 if (rc)
2535 goto out;
2536
2537 if (i == SYM_ROLES) {
2538 rc = roles_init(p);
2539 if (rc)
2540 goto out;
2541 }
2542
2543 for (j = 0; j < nel; j++) {
2544 rc = read_f[i](p, &p->symtab[i], fp);
2545 if (rc)
2546 goto bad;
2547 }
2548
2549 p->symtab[i].nprim = nprim;
2550 }
2551
2552 rc = -EINVAL;
2553 p->process_class = string_to_security_class(p, "process");
2554 if (!p->process_class) {
2555 pr_err("SELinux: process class is required, not defined in policy\n");
2556 goto bad;
2557 }
2558
2559 rc = avtab_read(&p->te_avtab, fp, p);
2560 if (rc)
2561 goto bad;
2562
2563 if (p->policyvers >= POLICYDB_VERSION_BOOL) {
2564 rc = cond_read_list(p, fp);
2565 if (rc)
2566 goto bad;
2567 }
2568
2569 rc = next_entry(buf, fp, sizeof(u32));
2570 if (rc)
2571 goto bad;
2572 nel = le32_to_cpu(buf[0]);
2573
2574 rc = hashtab_init(&p->role_tr, nel);
2575 if (rc)
2576 goto bad;
2577 for (i = 0; i < nel; i++) {
2578 rc = -ENOMEM;
2579 rtk = kmalloc(sizeof(*rtk), GFP_KERNEL);
2580 if (!rtk)
2581 goto bad;
2582
2583 rc = -ENOMEM;
2584 rtd = kmalloc(sizeof(*rtd), GFP_KERNEL);
2585 if (!rtd)
2586 goto bad;
2587
2588 rc = next_entry(buf, fp, sizeof(u32)*3);
2589 if (rc)
2590 goto bad;
2591
2592 rc = -EINVAL;
2593 rtk->role = le32_to_cpu(buf[0]);
2594 rtk->type = le32_to_cpu(buf[1]);
2595 rtd->new_role = le32_to_cpu(buf[2]);
2596 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2597 rc = next_entry(buf, fp, sizeof(u32));
2598 if (rc)
2599 goto bad;
2600 rtk->tclass = le32_to_cpu(buf[0]);
2601 } else
2602 rtk->tclass = p->process_class;
2603
2604 rc = -EINVAL;
2605 if (!policydb_role_isvalid(p, rtk->role) ||
2606 !policydb_type_isvalid(p, rtk->type) ||
2607 !policydb_class_isvalid(p, rtk->tclass) ||
2608 !policydb_role_isvalid(p, rtd->new_role))
2609 goto bad;
2610
2611 rc = hashtab_insert(&p->role_tr, rtk, rtd, roletr_key_params);
2612 if (rc)
2613 goto bad;
2614
2615 rtk = NULL;
2616 rtd = NULL;
2617 }
2618
2619 rc = next_entry(buf, fp, sizeof(u32));
2620 if (rc)
2621 goto bad;
2622 nel = le32_to_cpu(buf[0]);
2623 lra = NULL;
2624 for (i = 0; i < nel; i++) {
2625 rc = -ENOMEM;
2626 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
2627 if (!ra)
2628 goto bad;
2629 if (lra)
2630 lra->next = ra;
2631 else
2632 p->role_allow = ra;
2633 rc = next_entry(buf, fp, sizeof(u32)*2);
2634 if (rc)
2635 goto bad;
2636
2637 rc = -EINVAL;
2638 ra->role = le32_to_cpu(buf[0]);
2639 ra->new_role = le32_to_cpu(buf[1]);
2640 if (!policydb_role_isvalid(p, ra->role) ||
2641 !policydb_role_isvalid(p, ra->new_role))
2642 goto bad;
2643 lra = ra;
2644 }
2645
2646 rc = filename_trans_read(p, fp);
2647 if (rc)
2648 goto bad;
2649
2650 rc = policydb_index(p);
2651 if (rc)
2652 goto bad;
2653
2654 rc = -EINVAL;
2655 perm = string_to_av_perm(p, p->process_class, "transition");
2656 if (!perm) {
2657 pr_err("SELinux: process transition permission is required, not defined in policy\n");
2658 goto bad;
2659 }
2660 p->process_trans_perms = perm;
2661 perm = string_to_av_perm(p, p->process_class, "dyntransition");
2662 if (!perm) {
2663 pr_err("SELinux: process dyntransition permission is required, not defined in policy\n");
2664 goto bad;
2665 }
2666 p->process_trans_perms |= perm;
2667
2668 rc = ocontext_read(p, info, fp);
2669 if (rc)
2670 goto bad;
2671
2672 rc = genfs_read(p, fp);
2673 if (rc)
2674 goto bad;
2675
2676 rc = range_read(p, fp);
2677 if (rc)
2678 goto bad;
2679
2680 rc = -ENOMEM;
2681 p->type_attr_map_array = kvcalloc(p->p_types.nprim,
2682 sizeof(*p->type_attr_map_array),
2683 GFP_KERNEL);
2684 if (!p->type_attr_map_array)
2685 goto bad;
2686
2687 /* just in case ebitmap_init() becomes more than just a memset(0): */
2688 for (i = 0; i < p->p_types.nprim; i++)
2689 ebitmap_init(&p->type_attr_map_array[i]);
2690
2691 for (i = 0; i < p->p_types.nprim; i++) {
2692 struct ebitmap *e = &p->type_attr_map_array[i];
2693
2694 if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
2695 rc = ebitmap_read(e, fp);
2696 if (rc)
2697 goto bad;
2698 }
2699 /* add the type itself as the degenerate case */
2700 rc = ebitmap_set_bit(e, i, 1);
2701 if (rc)
2702 goto bad;
2703 }
2704
2705 rc = policydb_bounds_sanity_check(p);
2706 if (rc)
2707 goto bad;
2708
2709 rc = 0;
2710out:
2711 return rc;
2712bad:
2713 kfree(rtk);
2714 kfree(rtd);
2715 policydb_destroy(p);
2716 goto out;
2717}
2718
2719/*
2720 * Write a MLS level structure to a policydb binary
2721 * representation file.
2722 */
2723static int mls_write_level(struct mls_level *l, void *fp)
2724{
2725 __le32 buf[1];
2726 int rc;
2727
2728 buf[0] = cpu_to_le32(l->sens);
2729 rc = put_entry(buf, sizeof(u32), 1, fp);
2730 if (rc)
2731 return rc;
2732
2733 rc = ebitmap_write(&l->cat, fp);
2734 if (rc)
2735 return rc;
2736
2737 return 0;
2738}
2739
2740/*
2741 * Write a MLS range structure to a policydb binary
2742 * representation file.
2743 */
2744static int mls_write_range_helper(struct mls_range *r, void *fp)
2745{
2746 __le32 buf[3];
2747 size_t items;
2748 int rc, eq;
2749
2750 eq = mls_level_eq(&r->level[1], &r->level[0]);
2751
2752 if (eq)
2753 items = 2;
2754 else
2755 items = 3;
2756 buf[0] = cpu_to_le32(items-1);
2757 buf[1] = cpu_to_le32(r->level[0].sens);
2758 if (!eq)
2759 buf[2] = cpu_to_le32(r->level[1].sens);
2760
2761 BUG_ON(items > ARRAY_SIZE(buf));
2762
2763 rc = put_entry(buf, sizeof(u32), items, fp);
2764 if (rc)
2765 return rc;
2766
2767 rc = ebitmap_write(&r->level[0].cat, fp);
2768 if (rc)
2769 return rc;
2770 if (!eq) {
2771 rc = ebitmap_write(&r->level[1].cat, fp);
2772 if (rc)
2773 return rc;
2774 }
2775
2776 return 0;
2777}
2778
2779static int sens_write(void *vkey, void *datum, void *ptr)
2780{
2781 char *key = vkey;
2782 struct level_datum *levdatum = datum;
2783 struct policy_data *pd = ptr;
2784 void *fp = pd->fp;
2785 __le32 buf[2];
2786 size_t len;
2787 int rc;
2788
2789 len = strlen(key);
2790 buf[0] = cpu_to_le32(len);
2791 buf[1] = cpu_to_le32(levdatum->isalias);
2792 rc = put_entry(buf, sizeof(u32), 2, fp);
2793 if (rc)
2794 return rc;
2795
2796 rc = put_entry(key, 1, len, fp);
2797 if (rc)
2798 return rc;
2799
2800 rc = mls_write_level(levdatum->level, fp);
2801 if (rc)
2802 return rc;
2803
2804 return 0;
2805}
2806
2807static int cat_write(void *vkey, void *datum, void *ptr)
2808{
2809 char *key = vkey;
2810 struct cat_datum *catdatum = datum;
2811 struct policy_data *pd = ptr;
2812 void *fp = pd->fp;
2813 __le32 buf[3];
2814 size_t len;
2815 int rc;
2816
2817 len = strlen(key);
2818 buf[0] = cpu_to_le32(len);
2819 buf[1] = cpu_to_le32(catdatum->value);
2820 buf[2] = cpu_to_le32(catdatum->isalias);
2821 rc = put_entry(buf, sizeof(u32), 3, fp);
2822 if (rc)
2823 return rc;
2824
2825 rc = put_entry(key, 1, len, fp);
2826 if (rc)
2827 return rc;
2828
2829 return 0;
2830}
2831
2832static int role_trans_write_one(void *key, void *datum, void *ptr)
2833{
2834 struct role_trans_key *rtk = key;
2835 struct role_trans_datum *rtd = datum;
2836 struct policy_data *pd = ptr;
2837 void *fp = pd->fp;
2838 struct policydb *p = pd->p;
2839 __le32 buf[3];
2840 int rc;
2841
2842 buf[0] = cpu_to_le32(rtk->role);
2843 buf[1] = cpu_to_le32(rtk->type);
2844 buf[2] = cpu_to_le32(rtd->new_role);
2845 rc = put_entry(buf, sizeof(u32), 3, fp);
2846 if (rc)
2847 return rc;
2848 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2849 buf[0] = cpu_to_le32(rtk->tclass);
2850 rc = put_entry(buf, sizeof(u32), 1, fp);
2851 if (rc)
2852 return rc;
2853 }
2854 return 0;
2855}
2856
2857static int role_trans_write(struct policydb *p, void *fp)
2858{
2859 struct policy_data pd = { .p = p, .fp = fp };
2860 __le32 buf[1];
2861 int rc;
2862
2863 buf[0] = cpu_to_le32(p->role_tr.nel);
2864 rc = put_entry(buf, sizeof(u32), 1, fp);
2865 if (rc)
2866 return rc;
2867
2868 return hashtab_map(&p->role_tr, role_trans_write_one, &pd);
2869}
2870
2871static int role_allow_write(struct role_allow *r, void *fp)
2872{
2873 struct role_allow *ra;
2874 __le32 buf[2];
2875 size_t nel;
2876 int rc;
2877
2878 nel = 0;
2879 for (ra = r; ra; ra = ra->next)
2880 nel++;
2881 buf[0] = cpu_to_le32(nel);
2882 rc = put_entry(buf, sizeof(u32), 1, fp);
2883 if (rc)
2884 return rc;
2885 for (ra = r; ra; ra = ra->next) {
2886 buf[0] = cpu_to_le32(ra->role);
2887 buf[1] = cpu_to_le32(ra->new_role);
2888 rc = put_entry(buf, sizeof(u32), 2, fp);
2889 if (rc)
2890 return rc;
2891 }
2892 return 0;
2893}
2894
2895/*
2896 * Write a security context structure
2897 * to a policydb binary representation file.
2898 */
2899static int context_write(struct policydb *p, struct context *c,
2900 void *fp)
2901{
2902 int rc;
2903 __le32 buf[3];
2904
2905 buf[0] = cpu_to_le32(c->user);
2906 buf[1] = cpu_to_le32(c->role);
2907 buf[2] = cpu_to_le32(c->type);
2908
2909 rc = put_entry(buf, sizeof(u32), 3, fp);
2910 if (rc)
2911 return rc;
2912
2913 rc = mls_write_range_helper(&c->range, fp);
2914 if (rc)
2915 return rc;
2916
2917 return 0;
2918}
2919
2920/*
2921 * The following *_write functions are used to
2922 * write the symbol data to a policy database
2923 * binary representation file.
2924 */
2925
2926static int perm_write(void *vkey, void *datum, void *fp)
2927{
2928 char *key = vkey;
2929 struct perm_datum *perdatum = datum;
2930 __le32 buf[2];
2931 size_t len;
2932 int rc;
2933
2934 len = strlen(key);
2935 buf[0] = cpu_to_le32(len);
2936 buf[1] = cpu_to_le32(perdatum->value);
2937 rc = put_entry(buf, sizeof(u32), 2, fp);
2938 if (rc)
2939 return rc;
2940
2941 rc = put_entry(key, 1, len, fp);
2942 if (rc)
2943 return rc;
2944
2945 return 0;
2946}
2947
2948static int common_write(void *vkey, void *datum, void *ptr)
2949{
2950 char *key = vkey;
2951 struct common_datum *comdatum = datum;
2952 struct policy_data *pd = ptr;
2953 void *fp = pd->fp;
2954 __le32 buf[4];
2955 size_t len;
2956 int rc;
2957
2958 len = strlen(key);
2959 buf[0] = cpu_to_le32(len);
2960 buf[1] = cpu_to_le32(comdatum->value);
2961 buf[2] = cpu_to_le32(comdatum->permissions.nprim);
2962 buf[3] = cpu_to_le32(comdatum->permissions.table.nel);
2963 rc = put_entry(buf, sizeof(u32), 4, fp);
2964 if (rc)
2965 return rc;
2966
2967 rc = put_entry(key, 1, len, fp);
2968 if (rc)
2969 return rc;
2970
2971 rc = hashtab_map(&comdatum->permissions.table, perm_write, fp);
2972 if (rc)
2973 return rc;
2974
2975 return 0;
2976}
2977
2978static int type_set_write(struct type_set *t, void *fp)
2979{
2980 int rc;
2981 __le32 buf[1];
2982
2983 if (ebitmap_write(&t->types, fp))
2984 return -EINVAL;
2985 if (ebitmap_write(&t->negset, fp))
2986 return -EINVAL;
2987
2988 buf[0] = cpu_to_le32(t->flags);
2989 rc = put_entry(buf, sizeof(u32), 1, fp);
2990 if (rc)
2991 return -EINVAL;
2992
2993 return 0;
2994}
2995
2996static int write_cons_helper(struct policydb *p, struct constraint_node *node,
2997 void *fp)
2998{
2999 struct constraint_node *c;
3000 struct constraint_expr *e;
3001 __le32 buf[3];
3002 u32 nel;
3003 int rc;
3004
3005 for (c = node; c; c = c->next) {
3006 nel = 0;
3007 for (e = c->expr; e; e = e->next)
3008 nel++;
3009 buf[0] = cpu_to_le32(c->permissions);
3010 buf[1] = cpu_to_le32(nel);
3011 rc = put_entry(buf, sizeof(u32), 2, fp);
3012 if (rc)
3013 return rc;
3014 for (e = c->expr; e; e = e->next) {
3015 buf[0] = cpu_to_le32(e->expr_type);
3016 buf[1] = cpu_to_le32(e->attr);
3017 buf[2] = cpu_to_le32(e->op);
3018 rc = put_entry(buf, sizeof(u32), 3, fp);
3019 if (rc)
3020 return rc;
3021
3022 switch (e->expr_type) {
3023 case CEXPR_NAMES:
3024 rc = ebitmap_write(&e->names, fp);
3025 if (rc)
3026 return rc;
3027 if (p->policyvers >=
3028 POLICYDB_VERSION_CONSTRAINT_NAMES) {
3029 rc = type_set_write(e->type_names, fp);
3030 if (rc)
3031 return rc;
3032 }
3033 break;
3034 default:
3035 break;
3036 }
3037 }
3038 }
3039
3040 return 0;
3041}
3042
3043static int class_write(void *vkey, void *datum, void *ptr)
3044{
3045 char *key = vkey;
3046 struct class_datum *cladatum = datum;
3047 struct policy_data *pd = ptr;
3048 void *fp = pd->fp;
3049 struct policydb *p = pd->p;
3050 struct constraint_node *c;
3051 __le32 buf[6];
3052 u32 ncons;
3053 size_t len, len2;
3054 int rc;
3055
3056 len = strlen(key);
3057 if (cladatum->comkey)
3058 len2 = strlen(cladatum->comkey);
3059 else
3060 len2 = 0;
3061
3062 ncons = 0;
3063 for (c = cladatum->constraints; c; c = c->next)
3064 ncons++;
3065
3066 buf[0] = cpu_to_le32(len);
3067 buf[1] = cpu_to_le32(len2);
3068 buf[2] = cpu_to_le32(cladatum->value);
3069 buf[3] = cpu_to_le32(cladatum->permissions.nprim);
3070 buf[4] = cpu_to_le32(cladatum->permissions.table.nel);
3071 buf[5] = cpu_to_le32(ncons);
3072 rc = put_entry(buf, sizeof(u32), 6, fp);
3073 if (rc)
3074 return rc;
3075
3076 rc = put_entry(key, 1, len, fp);
3077 if (rc)
3078 return rc;
3079
3080 if (cladatum->comkey) {
3081 rc = put_entry(cladatum->comkey, 1, len2, fp);
3082 if (rc)
3083 return rc;
3084 }
3085
3086 rc = hashtab_map(&cladatum->permissions.table, perm_write, fp);
3087 if (rc)
3088 return rc;
3089
3090 rc = write_cons_helper(p, cladatum->constraints, fp);
3091 if (rc)
3092 return rc;
3093
3094 /* write out the validatetrans rule */
3095 ncons = 0;
3096 for (c = cladatum->validatetrans; c; c = c->next)
3097 ncons++;
3098
3099 buf[0] = cpu_to_le32(ncons);
3100 rc = put_entry(buf, sizeof(u32), 1, fp);
3101 if (rc)
3102 return rc;
3103
3104 rc = write_cons_helper(p, cladatum->validatetrans, fp);
3105 if (rc)
3106 return rc;
3107
3108 if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
3109 buf[0] = cpu_to_le32(cladatum->default_user);
3110 buf[1] = cpu_to_le32(cladatum->default_role);
3111 buf[2] = cpu_to_le32(cladatum->default_range);
3112
3113 rc = put_entry(buf, sizeof(uint32_t), 3, fp);
3114 if (rc)
3115 return rc;
3116 }
3117
3118 if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
3119 buf[0] = cpu_to_le32(cladatum->default_type);
3120 rc = put_entry(buf, sizeof(uint32_t), 1, fp);
3121 if (rc)
3122 return rc;
3123 }
3124
3125 return 0;
3126}
3127
3128static int role_write(void *vkey, void *datum, void *ptr)
3129{
3130 char *key = vkey;
3131 struct role_datum *role = datum;
3132 struct policy_data *pd = ptr;
3133 void *fp = pd->fp;
3134 struct policydb *p = pd->p;
3135 __le32 buf[3];
3136 size_t items, len;
3137 int rc;
3138
3139 len = strlen(key);
3140 items = 0;
3141 buf[items++] = cpu_to_le32(len);
3142 buf[items++] = cpu_to_le32(role->value);
3143 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
3144 buf[items++] = cpu_to_le32(role->bounds);
3145
3146 BUG_ON(items > ARRAY_SIZE(buf));
3147
3148 rc = put_entry(buf, sizeof(u32), items, fp);
3149 if (rc)
3150 return rc;
3151
3152 rc = put_entry(key, 1, len, fp);
3153 if (rc)
3154 return rc;
3155
3156 rc = ebitmap_write(&role->dominates, fp);
3157 if (rc)
3158 return rc;
3159
3160 rc = ebitmap_write(&role->types, fp);
3161 if (rc)
3162 return rc;
3163
3164 return 0;
3165}
3166
3167static int type_write(void *vkey, void *datum, void *ptr)
3168{
3169 char *key = vkey;
3170 struct type_datum *typdatum = datum;
3171 struct policy_data *pd = ptr;
3172 struct policydb *p = pd->p;
3173 void *fp = pd->fp;
3174 __le32 buf[4];
3175 int rc;
3176 size_t items, len;
3177
3178 len = strlen(key);
3179 items = 0;
3180 buf[items++] = cpu_to_le32(len);
3181 buf[items++] = cpu_to_le32(typdatum->value);
3182 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
3183 u32 properties = 0;
3184
3185 if (typdatum->primary)
3186 properties |= TYPEDATUM_PROPERTY_PRIMARY;
3187
3188 if (typdatum->attribute)
3189 properties |= TYPEDATUM_PROPERTY_ATTRIBUTE;
3190
3191 buf[items++] = cpu_to_le32(properties);
3192 buf[items++] = cpu_to_le32(typdatum->bounds);
3193 } else {
3194 buf[items++] = cpu_to_le32(typdatum->primary);
3195 }
3196 BUG_ON(items > ARRAY_SIZE(buf));
3197 rc = put_entry(buf, sizeof(u32), items, fp);
3198 if (rc)
3199 return rc;
3200
3201 rc = put_entry(key, 1, len, fp);
3202 if (rc)
3203 return rc;
3204
3205 return 0;
3206}
3207
3208static int user_write(void *vkey, void *datum, void *ptr)
3209{
3210 char *key = vkey;
3211 struct user_datum *usrdatum = datum;
3212 struct policy_data *pd = ptr;
3213 struct policydb *p = pd->p;
3214 void *fp = pd->fp;
3215 __le32 buf[3];
3216 size_t items, len;
3217 int rc;
3218
3219 len = strlen(key);
3220 items = 0;
3221 buf[items++] = cpu_to_le32(len);
3222 buf[items++] = cpu_to_le32(usrdatum->value);
3223 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
3224 buf[items++] = cpu_to_le32(usrdatum->bounds);
3225 BUG_ON(items > ARRAY_SIZE(buf));
3226 rc = put_entry(buf, sizeof(u32), items, fp);
3227 if (rc)
3228 return rc;
3229
3230 rc = put_entry(key, 1, len, fp);
3231 if (rc)
3232 return rc;
3233
3234 rc = ebitmap_write(&usrdatum->roles, fp);
3235 if (rc)
3236 return rc;
3237
3238 rc = mls_write_range_helper(&usrdatum->range, fp);
3239 if (rc)
3240 return rc;
3241
3242 rc = mls_write_level(&usrdatum->dfltlevel, fp);
3243 if (rc)
3244 return rc;
3245
3246 return 0;
3247}
3248
3249static int (*write_f[SYM_NUM]) (void *key, void *datum,
3250 void *datap) =
3251{
3252 common_write,
3253 class_write,
3254 role_write,
3255 type_write,
3256 user_write,
3257 cond_write_bool,
3258 sens_write,
3259 cat_write,
3260};
3261
3262static int ocontext_write(struct policydb *p, struct policydb_compat_info *info,
3263 void *fp)
3264{
3265 unsigned int i, j, rc;
3266 size_t nel, len;
3267 __be64 prefixbuf[1];
3268 __le32 buf[3];
3269 u32 nodebuf[8];
3270 struct ocontext *c;
3271 for (i = 0; i < info->ocon_num; i++) {
3272 nel = 0;
3273 for (c = p->ocontexts[i]; c; c = c->next)
3274 nel++;
3275 buf[0] = cpu_to_le32(nel);
3276 rc = put_entry(buf, sizeof(u32), 1, fp);
3277 if (rc)
3278 return rc;
3279 for (c = p->ocontexts[i]; c; c = c->next) {
3280 switch (i) {
3281 case OCON_ISID:
3282 buf[0] = cpu_to_le32(c->sid[0]);
3283 rc = put_entry(buf, sizeof(u32), 1, fp);
3284 if (rc)
3285 return rc;
3286 rc = context_write(p, &c->context[0], fp);
3287 if (rc)
3288 return rc;
3289 break;
3290 case OCON_FS:
3291 case OCON_NETIF:
3292 len = strlen(c->u.name);
3293 buf[0] = cpu_to_le32(len);
3294 rc = put_entry(buf, sizeof(u32), 1, fp);
3295 if (rc)
3296 return rc;
3297 rc = put_entry(c->u.name, 1, len, fp);
3298 if (rc)
3299 return rc;
3300 rc = context_write(p, &c->context[0], fp);
3301 if (rc)
3302 return rc;
3303 rc = context_write(p, &c->context[1], fp);
3304 if (rc)
3305 return rc;
3306 break;
3307 case OCON_PORT:
3308 buf[0] = cpu_to_le32(c->u.port.protocol);
3309 buf[1] = cpu_to_le32(c->u.port.low_port);
3310 buf[2] = cpu_to_le32(c->u.port.high_port);
3311 rc = put_entry(buf, sizeof(u32), 3, fp);
3312 if (rc)
3313 return rc;
3314 rc = context_write(p, &c->context[0], fp);
3315 if (rc)
3316 return rc;
3317 break;
3318 case OCON_NODE:
3319 nodebuf[0] = c->u.node.addr; /* network order */
3320 nodebuf[1] = c->u.node.mask; /* network order */
3321 rc = put_entry(nodebuf, sizeof(u32), 2, fp);
3322 if (rc)
3323 return rc;
3324 rc = context_write(p, &c->context[0], fp);
3325 if (rc)
3326 return rc;
3327 break;
3328 case OCON_FSUSE:
3329 buf[0] = cpu_to_le32(c->v.behavior);
3330 len = strlen(c->u.name);
3331 buf[1] = cpu_to_le32(len);
3332 rc = put_entry(buf, sizeof(u32), 2, fp);
3333 if (rc)
3334 return rc;
3335 rc = put_entry(c->u.name, 1, len, fp);
3336 if (rc)
3337 return rc;
3338 rc = context_write(p, &c->context[0], fp);
3339 if (rc)
3340 return rc;
3341 break;
3342 case OCON_NODE6:
3343 for (j = 0; j < 4; j++)
3344 nodebuf[j] = c->u.node6.addr[j]; /* network order */
3345 for (j = 0; j < 4; j++)
3346 nodebuf[j + 4] = c->u.node6.mask[j]; /* network order */
3347 rc = put_entry(nodebuf, sizeof(u32), 8, fp);
3348 if (rc)
3349 return rc;
3350 rc = context_write(p, &c->context[0], fp);
3351 if (rc)
3352 return rc;
3353 break;
3354 case OCON_IBPKEY:
3355 /* subnet_prefix is in CPU order */
3356 prefixbuf[0] = cpu_to_be64(c->u.ibpkey.subnet_prefix);
3357
3358 rc = put_entry(prefixbuf, sizeof(u64), 1, fp);
3359 if (rc)
3360 return rc;
3361
3362 buf[0] = cpu_to_le32(c->u.ibpkey.low_pkey);
3363 buf[1] = cpu_to_le32(c->u.ibpkey.high_pkey);
3364
3365 rc = put_entry(buf, sizeof(u32), 2, fp);
3366 if (rc)
3367 return rc;
3368 rc = context_write(p, &c->context[0], fp);
3369 if (rc)
3370 return rc;
3371 break;
3372 case OCON_IBENDPORT:
3373 len = strlen(c->u.ibendport.dev_name);
3374 buf[0] = cpu_to_le32(len);
3375 buf[1] = cpu_to_le32(c->u.ibendport.port);
3376 rc = put_entry(buf, sizeof(u32), 2, fp);
3377 if (rc)
3378 return rc;
3379 rc = put_entry(c->u.ibendport.dev_name, 1, len, fp);
3380 if (rc)
3381 return rc;
3382 rc = context_write(p, &c->context[0], fp);
3383 if (rc)
3384 return rc;
3385 break;
3386 }
3387 }
3388 }
3389 return 0;
3390}
3391
3392static int genfs_write(struct policydb *p, void *fp)
3393{
3394 struct genfs *genfs;
3395 struct ocontext *c;
3396 size_t len;
3397 __le32 buf[1];
3398 int rc;
3399
3400 len = 0;
3401 for (genfs = p->genfs; genfs; genfs = genfs->next)
3402 len++;
3403 buf[0] = cpu_to_le32(len);
3404 rc = put_entry(buf, sizeof(u32), 1, fp);
3405 if (rc)
3406 return rc;
3407 for (genfs = p->genfs; genfs; genfs = genfs->next) {
3408 len = strlen(genfs->fstype);
3409 buf[0] = cpu_to_le32(len);
3410 rc = put_entry(buf, sizeof(u32), 1, fp);
3411 if (rc)
3412 return rc;
3413 rc = put_entry(genfs->fstype, 1, len, fp);
3414 if (rc)
3415 return rc;
3416 len = 0;
3417 for (c = genfs->head; c; c = c->next)
3418 len++;
3419 buf[0] = cpu_to_le32(len);
3420 rc = put_entry(buf, sizeof(u32), 1, fp);
3421 if (rc)
3422 return rc;
3423 for (c = genfs->head; c; c = c->next) {
3424 len = strlen(c->u.name);
3425 buf[0] = cpu_to_le32(len);
3426 rc = put_entry(buf, sizeof(u32), 1, fp);
3427 if (rc)
3428 return rc;
3429 rc = put_entry(c->u.name, 1, len, fp);
3430 if (rc)
3431 return rc;
3432 buf[0] = cpu_to_le32(c->v.sclass);
3433 rc = put_entry(buf, sizeof(u32), 1, fp);
3434 if (rc)
3435 return rc;
3436 rc = context_write(p, &c->context[0], fp);
3437 if (rc)
3438 return rc;
3439 }
3440 }
3441 return 0;
3442}
3443
3444static int range_write_helper(void *key, void *data, void *ptr)
3445{
3446 __le32 buf[2];
3447 struct range_trans *rt = key;
3448 struct mls_range *r = data;
3449 struct policy_data *pd = ptr;
3450 void *fp = pd->fp;
3451 struct policydb *p = pd->p;
3452 int rc;
3453
3454 buf[0] = cpu_to_le32(rt->source_type);
3455 buf[1] = cpu_to_le32(rt->target_type);
3456 rc = put_entry(buf, sizeof(u32), 2, fp);
3457 if (rc)
3458 return rc;
3459 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
3460 buf[0] = cpu_to_le32(rt->target_class);
3461 rc = put_entry(buf, sizeof(u32), 1, fp);
3462 if (rc)
3463 return rc;
3464 }
3465 rc = mls_write_range_helper(r, fp);
3466 if (rc)
3467 return rc;
3468
3469 return 0;
3470}
3471
3472static int range_write(struct policydb *p, void *fp)
3473{
3474 __le32 buf[1];
3475 int rc;
3476 struct policy_data pd;
3477
3478 pd.p = p;
3479 pd.fp = fp;
3480
3481 buf[0] = cpu_to_le32(p->range_tr.nel);
3482 rc = put_entry(buf, sizeof(u32), 1, fp);
3483 if (rc)
3484 return rc;
3485
3486 /* actually write all of the entries */
3487 rc = hashtab_map(&p->range_tr, range_write_helper, &pd);
3488 if (rc)
3489 return rc;
3490
3491 return 0;
3492}
3493
3494static int filename_write_helper_compat(void *key, void *data, void *ptr)
3495{
3496 struct filename_trans_key *ft = key;
3497 struct filename_trans_datum *datum = data;
3498 struct ebitmap_node *node;
3499 void *fp = ptr;
3500 __le32 buf[4];
3501 int rc;
3502 u32 bit, len = strlen(ft->name);
3503
3504 do {
3505 ebitmap_for_each_positive_bit(&datum->stypes, node, bit) {
3506 buf[0] = cpu_to_le32(len);
3507 rc = put_entry(buf, sizeof(u32), 1, fp);
3508 if (rc)
3509 return rc;
3510
3511 rc = put_entry(ft->name, sizeof(char), len, fp);
3512 if (rc)
3513 return rc;
3514
3515 buf[0] = cpu_to_le32(bit + 1);
3516 buf[1] = cpu_to_le32(ft->ttype);
3517 buf[2] = cpu_to_le32(ft->tclass);
3518 buf[3] = cpu_to_le32(datum->otype);
3519
3520 rc = put_entry(buf, sizeof(u32), 4, fp);
3521 if (rc)
3522 return rc;
3523 }
3524
3525 datum = datum->next;
3526 } while (unlikely(datum));
3527
3528 return 0;
3529}
3530
3531static int filename_write_helper(void *key, void *data, void *ptr)
3532{
3533 struct filename_trans_key *ft = key;
3534 struct filename_trans_datum *datum;
3535 void *fp = ptr;
3536 __le32 buf[3];
3537 int rc;
3538 u32 ndatum, len = strlen(ft->name);
3539
3540 buf[0] = cpu_to_le32(len);
3541 rc = put_entry(buf, sizeof(u32), 1, fp);
3542 if (rc)
3543 return rc;
3544
3545 rc = put_entry(ft->name, sizeof(char), len, fp);
3546 if (rc)
3547 return rc;
3548
3549 ndatum = 0;
3550 datum = data;
3551 do {
3552 ndatum++;
3553 datum = datum->next;
3554 } while (unlikely(datum));
3555
3556 buf[0] = cpu_to_le32(ft->ttype);
3557 buf[1] = cpu_to_le32(ft->tclass);
3558 buf[2] = cpu_to_le32(ndatum);
3559 rc = put_entry(buf, sizeof(u32), 3, fp);
3560 if (rc)
3561 return rc;
3562
3563 datum = data;
3564 do {
3565 rc = ebitmap_write(&datum->stypes, fp);
3566 if (rc)
3567 return rc;
3568
3569 buf[0] = cpu_to_le32(datum->otype);
3570 rc = put_entry(buf, sizeof(u32), 1, fp);
3571 if (rc)
3572 return rc;
3573
3574 datum = datum->next;
3575 } while (unlikely(datum));
3576
3577 return 0;
3578}
3579
3580static int filename_trans_write(struct policydb *p, void *fp)
3581{
3582 __le32 buf[1];
3583 int rc;
3584
3585 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
3586 return 0;
3587
3588 if (p->policyvers < POLICYDB_VERSION_COMP_FTRANS) {
3589 buf[0] = cpu_to_le32(p->compat_filename_trans_count);
3590 rc = put_entry(buf, sizeof(u32), 1, fp);
3591 if (rc)
3592 return rc;
3593
3594 rc = hashtab_map(&p->filename_trans,
3595 filename_write_helper_compat, fp);
3596 } else {
3597 buf[0] = cpu_to_le32(p->filename_trans.nel);
3598 rc = put_entry(buf, sizeof(u32), 1, fp);
3599 if (rc)
3600 return rc;
3601
3602 rc = hashtab_map(&p->filename_trans, filename_write_helper, fp);
3603 }
3604 return rc;
3605}
3606
3607/*
3608 * Write the configuration data in a policy database
3609 * structure to a policy database binary representation
3610 * file.
3611 */
3612int policydb_write(struct policydb *p, void *fp)
3613{
3614 unsigned int i, num_syms;
3615 int rc;
3616 __le32 buf[4];
3617 u32 config;
3618 size_t len;
3619 struct policydb_compat_info *info;
3620
3621 /*
3622 * refuse to write policy older than compressed avtab
3623 * to simplify the writer. There are other tests dropped
3624 * since we assume this throughout the writer code. Be
3625 * careful if you ever try to remove this restriction
3626 */
3627 if (p->policyvers < POLICYDB_VERSION_AVTAB) {
3628 pr_err("SELinux: refusing to write policy version %d."
3629 " Because it is less than version %d\n", p->policyvers,
3630 POLICYDB_VERSION_AVTAB);
3631 return -EINVAL;
3632 }
3633
3634 config = 0;
3635 if (p->mls_enabled)
3636 config |= POLICYDB_CONFIG_MLS;
3637
3638 if (p->reject_unknown)
3639 config |= REJECT_UNKNOWN;
3640 if (p->allow_unknown)
3641 config |= ALLOW_UNKNOWN;
3642
3643 /* Write the magic number and string identifiers. */
3644 buf[0] = cpu_to_le32(POLICYDB_MAGIC);
3645 len = strlen(POLICYDB_STRING);
3646 buf[1] = cpu_to_le32(len);
3647 rc = put_entry(buf, sizeof(u32), 2, fp);
3648 if (rc)
3649 return rc;
3650 rc = put_entry(POLICYDB_STRING, 1, len, fp);
3651 if (rc)
3652 return rc;
3653
3654 /* Write the version, config, and table sizes. */
3655 info = policydb_lookup_compat(p->policyvers);
3656 if (!info) {
3657 pr_err("SELinux: compatibility lookup failed for policy "
3658 "version %d", p->policyvers);
3659 return -EINVAL;
3660 }
3661
3662 buf[0] = cpu_to_le32(p->policyvers);
3663 buf[1] = cpu_to_le32(config);
3664 buf[2] = cpu_to_le32(info->sym_num);
3665 buf[3] = cpu_to_le32(info->ocon_num);
3666
3667 rc = put_entry(buf, sizeof(u32), 4, fp);
3668 if (rc)
3669 return rc;
3670
3671 if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
3672 rc = ebitmap_write(&p->policycaps, fp);
3673 if (rc)
3674 return rc;
3675 }
3676
3677 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
3678 rc = ebitmap_write(&p->permissive_map, fp);
3679 if (rc)
3680 return rc;
3681 }
3682
3683 num_syms = info->sym_num;
3684 for (i = 0; i < num_syms; i++) {
3685 struct policy_data pd;
3686
3687 pd.fp = fp;
3688 pd.p = p;
3689
3690 buf[0] = cpu_to_le32(p->symtab[i].nprim);
3691 buf[1] = cpu_to_le32(p->symtab[i].table.nel);
3692
3693 rc = put_entry(buf, sizeof(u32), 2, fp);
3694 if (rc)
3695 return rc;
3696 rc = hashtab_map(&p->symtab[i].table, write_f[i], &pd);
3697 if (rc)
3698 return rc;
3699 }
3700
3701 rc = avtab_write(p, &p->te_avtab, fp);
3702 if (rc)
3703 return rc;
3704
3705 rc = cond_write_list(p, fp);
3706 if (rc)
3707 return rc;
3708
3709 rc = role_trans_write(p, fp);
3710 if (rc)
3711 return rc;
3712
3713 rc = role_allow_write(p->role_allow, fp);
3714 if (rc)
3715 return rc;
3716
3717 rc = filename_trans_write(p, fp);
3718 if (rc)
3719 return rc;
3720
3721 rc = ocontext_write(p, info, fp);
3722 if (rc)
3723 return rc;
3724
3725 rc = genfs_write(p, fp);
3726 if (rc)
3727 return rc;
3728
3729 rc = range_write(p, fp);
3730 if (rc)
3731 return rc;
3732
3733 for (i = 0; i < p->p_types.nprim; i++) {
3734 struct ebitmap *e = &p->type_attr_map_array[i];
3735
3736 rc = ebitmap_write(e, fp);
3737 if (rc)
3738 return rc;
3739 }
3740
3741 return 0;
3742}