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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
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
180
181
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
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
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
546
547
548
549
550
551
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
714
715
716
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
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
867
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 return rc;
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 return -EINVAL;
889 }
890
891
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 return rc;
901 }
902 }
903 return 0;
904}
905
906int policydb_class_isvalid(struct policydb *p, unsigned int class)
907{
908 if (!class || class > p->p_classes.nprim)
909 return 0;
910 return 1;
911}
912
913int policydb_role_isvalid(struct policydb *p, unsigned int role)
914{
915 if (!role || role > p->p_roles.nprim)
916 return 0;
917 return 1;
918}
919
920int policydb_type_isvalid(struct policydb *p, unsigned int type)
921{
922 if (!type || type > p->p_types.nprim)
923 return 0;
924 return 1;
925}
926
927
928
929
930
931int policydb_context_isvalid(struct policydb *p, struct context *c)
932{
933 struct role_datum *role;
934 struct user_datum *usrdatum;
935
936 if (!c->role || c->role > p->p_roles.nprim)
937 return 0;
938
939 if (!c->user || c->user > p->p_users.nprim)
940 return 0;
941
942 if (!c->type || c->type > p->p_types.nprim)
943 return 0;
944
945 if (c->role != OBJECT_R_VAL) {
946
947
948
949 role = p->role_val_to_struct[c->role - 1];
950 if (!role || !ebitmap_get_bit(&role->types, c->type - 1))
951
952 return 0;
953
954
955
956
957 usrdatum = p->user_val_to_struct[c->user - 1];
958 if (!usrdatum)
959 return 0;
960
961 if (!ebitmap_get_bit(&usrdatum->roles, c->role - 1))
962
963 return 0;
964 }
965
966 if (!mls_context_isvalid(p, c))
967 return 0;
968
969 return 1;
970}
971
972
973
974
975
976static int mls_read_range_helper(struct mls_range *r, void *fp)
977{
978 __le32 buf[2];
979 u32 items;
980 int rc;
981
982 rc = next_entry(buf, fp, sizeof(u32));
983 if (rc)
984 goto out;
985
986 rc = -EINVAL;
987 items = le32_to_cpu(buf[0]);
988 if (items > ARRAY_SIZE(buf)) {
989 pr_err("SELinux: mls: range overflow\n");
990 goto out;
991 }
992
993 rc = next_entry(buf, fp, sizeof(u32) * items);
994 if (rc) {
995 pr_err("SELinux: mls: truncated range\n");
996 goto out;
997 }
998
999 r->level[0].sens = le32_to_cpu(buf[0]);
1000 if (items > 1)
1001 r->level[1].sens = le32_to_cpu(buf[1]);
1002 else
1003 r->level[1].sens = r->level[0].sens;
1004
1005 rc = ebitmap_read(&r->level[0].cat, fp);
1006 if (rc) {
1007 pr_err("SELinux: mls: error reading low categories\n");
1008 goto out;
1009 }
1010 if (items > 1) {
1011 rc = ebitmap_read(&r->level[1].cat, fp);
1012 if (rc) {
1013 pr_err("SELinux: mls: error reading high categories\n");
1014 goto bad_high;
1015 }
1016 } else {
1017 rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat);
1018 if (rc) {
1019 pr_err("SELinux: mls: out of memory\n");
1020 goto bad_high;
1021 }
1022 }
1023
1024 return 0;
1025bad_high:
1026 ebitmap_destroy(&r->level[0].cat);
1027out:
1028 return rc;
1029}
1030
1031
1032
1033
1034
1035static int context_read_and_validate(struct context *c,
1036 struct policydb *p,
1037 void *fp)
1038{
1039 __le32 buf[3];
1040 int rc;
1041
1042 rc = next_entry(buf, fp, sizeof buf);
1043 if (rc) {
1044 pr_err("SELinux: context truncated\n");
1045 goto out;
1046 }
1047 c->user = le32_to_cpu(buf[0]);
1048 c->role = le32_to_cpu(buf[1]);
1049 c->type = le32_to_cpu(buf[2]);
1050 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1051 rc = mls_read_range_helper(&c->range, fp);
1052 if (rc) {
1053 pr_err("SELinux: error reading MLS range of context\n");
1054 goto out;
1055 }
1056 }
1057
1058 rc = -EINVAL;
1059 if (!policydb_context_isvalid(p, c)) {
1060 pr_err("SELinux: invalid security context\n");
1061 context_destroy(c);
1062 goto out;
1063 }
1064 rc = 0;
1065out:
1066 return rc;
1067}
1068
1069
1070
1071
1072
1073
1074
1075static int str_read(char **strp, gfp_t flags, void *fp, u32 len)
1076{
1077 int rc;
1078 char *str;
1079
1080 if ((len == 0) || (len == (u32)-1))
1081 return -EINVAL;
1082
1083 str = kmalloc(len + 1, flags | __GFP_NOWARN);
1084 if (!str)
1085 return -ENOMEM;
1086
1087 rc = next_entry(str, fp, len);
1088 if (rc) {
1089 kfree(str);
1090 return rc;
1091 }
1092
1093 str[len] = '\0';
1094 *strp = str;
1095 return 0;
1096}
1097
1098static int perm_read(struct policydb *p, struct symtab *s, void *fp)
1099{
1100 char *key = NULL;
1101 struct perm_datum *perdatum;
1102 int rc;
1103 __le32 buf[2];
1104 u32 len;
1105
1106 perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
1107 if (!perdatum)
1108 return -ENOMEM;
1109
1110 rc = next_entry(buf, fp, sizeof buf);
1111 if (rc)
1112 goto bad;
1113
1114 len = le32_to_cpu(buf[0]);
1115 perdatum->value = le32_to_cpu(buf[1]);
1116
1117 rc = str_read(&key, GFP_KERNEL, fp, len);
1118 if (rc)
1119 goto bad;
1120
1121 rc = symtab_insert(s, key, perdatum);
1122 if (rc)
1123 goto bad;
1124
1125 return 0;
1126bad:
1127 perm_destroy(key, perdatum, NULL);
1128 return rc;
1129}
1130
1131static int common_read(struct policydb *p, struct symtab *s, void *fp)
1132{
1133 char *key = NULL;
1134 struct common_datum *comdatum;
1135 __le32 buf[4];
1136 u32 len, nel;
1137 int i, rc;
1138
1139 comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
1140 if (!comdatum)
1141 return -ENOMEM;
1142
1143 rc = next_entry(buf, fp, sizeof buf);
1144 if (rc)
1145 goto bad;
1146
1147 len = le32_to_cpu(buf[0]);
1148 comdatum->value = le32_to_cpu(buf[1]);
1149 nel = le32_to_cpu(buf[3]);
1150
1151 rc = symtab_init(&comdatum->permissions, nel);
1152 if (rc)
1153 goto bad;
1154 comdatum->permissions.nprim = le32_to_cpu(buf[2]);
1155
1156 rc = str_read(&key, GFP_KERNEL, fp, len);
1157 if (rc)
1158 goto bad;
1159
1160 for (i = 0; i < nel; i++) {
1161 rc = perm_read(p, &comdatum->permissions, fp);
1162 if (rc)
1163 goto bad;
1164 }
1165
1166 rc = symtab_insert(s, key, comdatum);
1167 if (rc)
1168 goto bad;
1169 return 0;
1170bad:
1171 common_destroy(key, comdatum, NULL);
1172 return rc;
1173}
1174
1175static void type_set_init(struct type_set *t)
1176{
1177 ebitmap_init(&t->types);
1178 ebitmap_init(&t->negset);
1179}
1180
1181static int type_set_read(struct type_set *t, void *fp)
1182{
1183 __le32 buf[1];
1184 int rc;
1185
1186 if (ebitmap_read(&t->types, fp))
1187 return -EINVAL;
1188 if (ebitmap_read(&t->negset, fp))
1189 return -EINVAL;
1190
1191 rc = next_entry(buf, fp, sizeof(u32));
1192 if (rc < 0)
1193 return -EINVAL;
1194 t->flags = le32_to_cpu(buf[0]);
1195
1196 return 0;
1197}
1198
1199
1200static int read_cons_helper(struct policydb *p,
1201 struct constraint_node **nodep,
1202 int ncons, int allowxtarget, void *fp)
1203{
1204 struct constraint_node *c, *lc;
1205 struct constraint_expr *e, *le;
1206 __le32 buf[3];
1207 u32 nexpr;
1208 int rc, i, j, depth;
1209
1210 lc = NULL;
1211 for (i = 0; i < ncons; i++) {
1212 c = kzalloc(sizeof(*c), GFP_KERNEL);
1213 if (!c)
1214 return -ENOMEM;
1215
1216 if (lc)
1217 lc->next = c;
1218 else
1219 *nodep = c;
1220
1221 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1222 if (rc)
1223 return rc;
1224 c->permissions = le32_to_cpu(buf[0]);
1225 nexpr = le32_to_cpu(buf[1]);
1226 le = NULL;
1227 depth = -1;
1228 for (j = 0; j < nexpr; j++) {
1229 e = kzalloc(sizeof(*e), GFP_KERNEL);
1230 if (!e)
1231 return -ENOMEM;
1232
1233 if (le)
1234 le->next = e;
1235 else
1236 c->expr = e;
1237
1238 rc = next_entry(buf, fp, (sizeof(u32) * 3));
1239 if (rc)
1240 return rc;
1241 e->expr_type = le32_to_cpu(buf[0]);
1242 e->attr = le32_to_cpu(buf[1]);
1243 e->op = le32_to_cpu(buf[2]);
1244
1245 switch (e->expr_type) {
1246 case CEXPR_NOT:
1247 if (depth < 0)
1248 return -EINVAL;
1249 break;
1250 case CEXPR_AND:
1251 case CEXPR_OR:
1252 if (depth < 1)
1253 return -EINVAL;
1254 depth--;
1255 break;
1256 case CEXPR_ATTR:
1257 if (depth == (CEXPR_MAXDEPTH - 1))
1258 return -EINVAL;
1259 depth++;
1260 break;
1261 case CEXPR_NAMES:
1262 if (!allowxtarget && (e->attr & CEXPR_XTARGET))
1263 return -EINVAL;
1264 if (depth == (CEXPR_MAXDEPTH - 1))
1265 return -EINVAL;
1266 depth++;
1267 rc = ebitmap_read(&e->names, fp);
1268 if (rc)
1269 return rc;
1270 if (p->policyvers >=
1271 POLICYDB_VERSION_CONSTRAINT_NAMES) {
1272 e->type_names = kzalloc(sizeof
1273 (*e->type_names), GFP_KERNEL);
1274 if (!e->type_names)
1275 return -ENOMEM;
1276 type_set_init(e->type_names);
1277 rc = type_set_read(e->type_names, fp);
1278 if (rc)
1279 return rc;
1280 }
1281 break;
1282 default:
1283 return -EINVAL;
1284 }
1285 le = e;
1286 }
1287 if (depth != 0)
1288 return -EINVAL;
1289 lc = c;
1290 }
1291
1292 return 0;
1293}
1294
1295static int class_read(struct policydb *p, struct symtab *s, void *fp)
1296{
1297 char *key = NULL;
1298 struct class_datum *cladatum;
1299 __le32 buf[6];
1300 u32 len, len2, ncons, nel;
1301 int i, rc;
1302
1303 cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
1304 if (!cladatum)
1305 return -ENOMEM;
1306
1307 rc = next_entry(buf, fp, sizeof(u32)*6);
1308 if (rc)
1309 goto bad;
1310
1311 len = le32_to_cpu(buf[0]);
1312 len2 = le32_to_cpu(buf[1]);
1313 cladatum->value = le32_to_cpu(buf[2]);
1314 nel = le32_to_cpu(buf[4]);
1315
1316 rc = symtab_init(&cladatum->permissions, nel);
1317 if (rc)
1318 goto bad;
1319 cladatum->permissions.nprim = le32_to_cpu(buf[3]);
1320
1321 ncons = le32_to_cpu(buf[5]);
1322
1323 rc = str_read(&key, GFP_KERNEL, fp, len);
1324 if (rc)
1325 goto bad;
1326
1327 if (len2) {
1328 rc = str_read(&cladatum->comkey, GFP_KERNEL, fp, len2);
1329 if (rc)
1330 goto bad;
1331
1332 rc = -EINVAL;
1333 cladatum->comdatum = symtab_search(&p->p_commons,
1334 cladatum->comkey);
1335 if (!cladatum->comdatum) {
1336 pr_err("SELinux: unknown common %s\n",
1337 cladatum->comkey);
1338 goto bad;
1339 }
1340 }
1341 for (i = 0; i < nel; i++) {
1342 rc = perm_read(p, &cladatum->permissions, fp);
1343 if (rc)
1344 goto bad;
1345 }
1346
1347 rc = read_cons_helper(p, &cladatum->constraints, ncons, 0, fp);
1348 if (rc)
1349 goto bad;
1350
1351 if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
1352
1353 rc = next_entry(buf, fp, sizeof(u32));
1354 if (rc)
1355 goto bad;
1356 ncons = le32_to_cpu(buf[0]);
1357 rc = read_cons_helper(p, &cladatum->validatetrans,
1358 ncons, 1, fp);
1359 if (rc)
1360 goto bad;
1361 }
1362
1363 if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
1364 rc = next_entry(buf, fp, sizeof(u32) * 3);
1365 if (rc)
1366 goto bad;
1367
1368 cladatum->default_user = le32_to_cpu(buf[0]);
1369 cladatum->default_role = le32_to_cpu(buf[1]);
1370 cladatum->default_range = le32_to_cpu(buf[2]);
1371 }
1372
1373 if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
1374 rc = next_entry(buf, fp, sizeof(u32) * 1);
1375 if (rc)
1376 goto bad;
1377 cladatum->default_type = le32_to_cpu(buf[0]);
1378 }
1379
1380 rc = symtab_insert(s, key, cladatum);
1381 if (rc)
1382 goto bad;
1383
1384 return 0;
1385bad:
1386 cls_destroy(key, cladatum, NULL);
1387 return rc;
1388}
1389
1390static int role_read(struct policydb *p, struct symtab *s, void *fp)
1391{
1392 char *key = NULL;
1393 struct role_datum *role;
1394 int rc, to_read = 2;
1395 __le32 buf[3];
1396 u32 len;
1397
1398 role = kzalloc(sizeof(*role), GFP_KERNEL);
1399 if (!role)
1400 return -ENOMEM;
1401
1402 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1403 to_read = 3;
1404
1405 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1406 if (rc)
1407 goto bad;
1408
1409 len = le32_to_cpu(buf[0]);
1410 role->value = le32_to_cpu(buf[1]);
1411 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1412 role->bounds = le32_to_cpu(buf[2]);
1413
1414 rc = str_read(&key, GFP_KERNEL, fp, len);
1415 if (rc)
1416 goto bad;
1417
1418 rc = ebitmap_read(&role->dominates, fp);
1419 if (rc)
1420 goto bad;
1421
1422 rc = ebitmap_read(&role->types, fp);
1423 if (rc)
1424 goto bad;
1425
1426 if (strcmp(key, OBJECT_R) == 0) {
1427 rc = -EINVAL;
1428 if (role->value != OBJECT_R_VAL) {
1429 pr_err("SELinux: Role %s has wrong value %d\n",
1430 OBJECT_R, role->value);
1431 goto bad;
1432 }
1433 rc = 0;
1434 goto bad;
1435 }
1436
1437 rc = symtab_insert(s, key, role);
1438 if (rc)
1439 goto bad;
1440 return 0;
1441bad:
1442 role_destroy(key, role, NULL);
1443 return rc;
1444}
1445
1446static int type_read(struct policydb *p, struct symtab *s, void *fp)
1447{
1448 char *key = NULL;
1449 struct type_datum *typdatum;
1450 int rc, to_read = 3;
1451 __le32 buf[4];
1452 u32 len;
1453
1454 typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL);
1455 if (!typdatum)
1456 return -ENOMEM;
1457
1458 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1459 to_read = 4;
1460
1461 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1462 if (rc)
1463 goto bad;
1464
1465 len = le32_to_cpu(buf[0]);
1466 typdatum->value = le32_to_cpu(buf[1]);
1467 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
1468 u32 prop = le32_to_cpu(buf[2]);
1469
1470 if (prop & TYPEDATUM_PROPERTY_PRIMARY)
1471 typdatum->primary = 1;
1472 if (prop & TYPEDATUM_PROPERTY_ATTRIBUTE)
1473 typdatum->attribute = 1;
1474
1475 typdatum->bounds = le32_to_cpu(buf[3]);
1476 } else {
1477 typdatum->primary = le32_to_cpu(buf[2]);
1478 }
1479
1480 rc = str_read(&key, GFP_KERNEL, fp, len);
1481 if (rc)
1482 goto bad;
1483
1484 rc = symtab_insert(s, key, typdatum);
1485 if (rc)
1486 goto bad;
1487 return 0;
1488bad:
1489 type_destroy(key, typdatum, NULL);
1490 return rc;
1491}
1492
1493
1494
1495
1496
1497
1498static int mls_read_level(struct mls_level *lp, void *fp)
1499{
1500 __le32 buf[1];
1501 int rc;
1502
1503 memset(lp, 0, sizeof(*lp));
1504
1505 rc = next_entry(buf, fp, sizeof buf);
1506 if (rc) {
1507 pr_err("SELinux: mls: truncated level\n");
1508 return rc;
1509 }
1510 lp->sens = le32_to_cpu(buf[0]);
1511
1512 rc = ebitmap_read(&lp->cat, fp);
1513 if (rc) {
1514 pr_err("SELinux: mls: error reading level categories\n");
1515 return rc;
1516 }
1517 return 0;
1518}
1519
1520static int user_read(struct policydb *p, struct symtab *s, void *fp)
1521{
1522 char *key = NULL;
1523 struct user_datum *usrdatum;
1524 int rc, to_read = 2;
1525 __le32 buf[3];
1526 u32 len;
1527
1528 usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
1529 if (!usrdatum)
1530 return -ENOMEM;
1531
1532 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1533 to_read = 3;
1534
1535 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1536 if (rc)
1537 goto bad;
1538
1539 len = le32_to_cpu(buf[0]);
1540 usrdatum->value = le32_to_cpu(buf[1]);
1541 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1542 usrdatum->bounds = le32_to_cpu(buf[2]);
1543
1544 rc = str_read(&key, GFP_KERNEL, fp, len);
1545 if (rc)
1546 goto bad;
1547
1548 rc = ebitmap_read(&usrdatum->roles, fp);
1549 if (rc)
1550 goto bad;
1551
1552 if (p->policyvers >= POLICYDB_VERSION_MLS) {
1553 rc = mls_read_range_helper(&usrdatum->range, fp);
1554 if (rc)
1555 goto bad;
1556 rc = mls_read_level(&usrdatum->dfltlevel, fp);
1557 if (rc)
1558 goto bad;
1559 }
1560
1561 rc = symtab_insert(s, key, usrdatum);
1562 if (rc)
1563 goto bad;
1564 return 0;
1565bad:
1566 user_destroy(key, usrdatum, NULL);
1567 return rc;
1568}
1569
1570static int sens_read(struct policydb *p, struct symtab *s, void *fp)
1571{
1572 char *key = NULL;
1573 struct level_datum *levdatum;
1574 int rc;
1575 __le32 buf[2];
1576 u32 len;
1577
1578 levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC);
1579 if (!levdatum)
1580 return -ENOMEM;
1581
1582 rc = next_entry(buf, fp, sizeof buf);
1583 if (rc)
1584 goto bad;
1585
1586 len = le32_to_cpu(buf[0]);
1587 levdatum->isalias = le32_to_cpu(buf[1]);
1588
1589 rc = str_read(&key, GFP_ATOMIC, fp, len);
1590 if (rc)
1591 goto bad;
1592
1593 rc = -ENOMEM;
1594 levdatum->level = kmalloc(sizeof(*levdatum->level), GFP_ATOMIC);
1595 if (!levdatum->level)
1596 goto bad;
1597
1598 rc = mls_read_level(levdatum->level, fp);
1599 if (rc)
1600 goto bad;
1601
1602 rc = symtab_insert(s, key, levdatum);
1603 if (rc)
1604 goto bad;
1605 return 0;
1606bad:
1607 sens_destroy(key, levdatum, NULL);
1608 return rc;
1609}
1610
1611static int cat_read(struct policydb *p, struct symtab *s, void *fp)
1612{
1613 char *key = NULL;
1614 struct cat_datum *catdatum;
1615 int rc;
1616 __le32 buf[3];
1617 u32 len;
1618
1619 catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC);
1620 if (!catdatum)
1621 return -ENOMEM;
1622
1623 rc = next_entry(buf, fp, sizeof buf);
1624 if (rc)
1625 goto bad;
1626
1627 len = le32_to_cpu(buf[0]);
1628 catdatum->value = le32_to_cpu(buf[1]);
1629 catdatum->isalias = le32_to_cpu(buf[2]);
1630
1631 rc = str_read(&key, GFP_ATOMIC, fp, len);
1632 if (rc)
1633 goto bad;
1634
1635 rc = symtab_insert(s, key, catdatum);
1636 if (rc)
1637 goto bad;
1638 return 0;
1639bad:
1640 cat_destroy(key, catdatum, NULL);
1641 return rc;
1642}
1643
1644static int (*read_f[SYM_NUM]) (struct policydb *p, struct symtab *s, void *fp) =
1645{
1646 common_read,
1647 class_read,
1648 role_read,
1649 type_read,
1650 user_read,
1651 cond_read_bool,
1652 sens_read,
1653 cat_read,
1654};
1655
1656static int user_bounds_sanity_check(void *key, void *datum, void *datap)
1657{
1658 struct user_datum *upper, *user;
1659 struct policydb *p = datap;
1660 int depth = 0;
1661
1662 upper = user = datum;
1663 while (upper->bounds) {
1664 struct ebitmap_node *node;
1665 unsigned long bit;
1666
1667 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1668 pr_err("SELinux: user %s: "
1669 "too deep or looped boundary",
1670 (char *) key);
1671 return -EINVAL;
1672 }
1673
1674 upper = p->user_val_to_struct[upper->bounds - 1];
1675 ebitmap_for_each_positive_bit(&user->roles, node, bit) {
1676 if (ebitmap_get_bit(&upper->roles, bit))
1677 continue;
1678
1679 pr_err("SELinux: boundary violated policy: "
1680 "user=%s role=%s bounds=%s\n",
1681 sym_name(p, SYM_USERS, user->value - 1),
1682 sym_name(p, SYM_ROLES, bit),
1683 sym_name(p, SYM_USERS, upper->value - 1));
1684
1685 return -EINVAL;
1686 }
1687 }
1688
1689 return 0;
1690}
1691
1692static int role_bounds_sanity_check(void *key, void *datum, void *datap)
1693{
1694 struct role_datum *upper, *role;
1695 struct policydb *p = datap;
1696 int depth = 0;
1697
1698 upper = role = datum;
1699 while (upper->bounds) {
1700 struct ebitmap_node *node;
1701 unsigned long bit;
1702
1703 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1704 pr_err("SELinux: role %s: "
1705 "too deep or looped bounds\n",
1706 (char *) key);
1707 return -EINVAL;
1708 }
1709
1710 upper = p->role_val_to_struct[upper->bounds - 1];
1711 ebitmap_for_each_positive_bit(&role->types, node, bit) {
1712 if (ebitmap_get_bit(&upper->types, bit))
1713 continue;
1714
1715 pr_err("SELinux: boundary violated policy: "
1716 "role=%s type=%s bounds=%s\n",
1717 sym_name(p, SYM_ROLES, role->value - 1),
1718 sym_name(p, SYM_TYPES, bit),
1719 sym_name(p, SYM_ROLES, upper->value - 1));
1720
1721 return -EINVAL;
1722 }
1723 }
1724
1725 return 0;
1726}
1727
1728static int type_bounds_sanity_check(void *key, void *datum, void *datap)
1729{
1730 struct type_datum *upper;
1731 struct policydb *p = datap;
1732 int depth = 0;
1733
1734 upper = datum;
1735 while (upper->bounds) {
1736 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1737 pr_err("SELinux: type %s: "
1738 "too deep or looped boundary\n",
1739 (char *) key);
1740 return -EINVAL;
1741 }
1742
1743 upper = p->type_val_to_struct[upper->bounds - 1];
1744 BUG_ON(!upper);
1745
1746 if (upper->attribute) {
1747 pr_err("SELinux: type %s: "
1748 "bounded by attribute %s",
1749 (char *) key,
1750 sym_name(p, SYM_TYPES, upper->value - 1));
1751 return -EINVAL;
1752 }
1753 }
1754
1755 return 0;
1756}
1757
1758static int policydb_bounds_sanity_check(struct policydb *p)
1759{
1760 int rc;
1761
1762 if (p->policyvers < POLICYDB_VERSION_BOUNDARY)
1763 return 0;
1764
1765 rc = hashtab_map(&p->p_users.table, user_bounds_sanity_check, p);
1766 if (rc)
1767 return rc;
1768
1769 rc = hashtab_map(&p->p_roles.table, role_bounds_sanity_check, p);
1770 if (rc)
1771 return rc;
1772
1773 rc = hashtab_map(&p->p_types.table, type_bounds_sanity_check, p);
1774 if (rc)
1775 return rc;
1776
1777 return 0;
1778}
1779
1780u16 string_to_security_class(struct policydb *p, const char *name)
1781{
1782 struct class_datum *cladatum;
1783
1784 cladatum = symtab_search(&p->p_classes, name);
1785 if (!cladatum)
1786 return 0;
1787
1788 return cladatum->value;
1789}
1790
1791u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name)
1792{
1793 struct class_datum *cladatum;
1794 struct perm_datum *perdatum = NULL;
1795 struct common_datum *comdatum;
1796
1797 if (!tclass || tclass > p->p_classes.nprim)
1798 return 0;
1799
1800 cladatum = p->class_val_to_struct[tclass-1];
1801 comdatum = cladatum->comdatum;
1802 if (comdatum)
1803 perdatum = symtab_search(&comdatum->permissions, name);
1804 if (!perdatum)
1805 perdatum = symtab_search(&cladatum->permissions, name);
1806 if (!perdatum)
1807 return 0;
1808
1809 return 1U << (perdatum->value-1);
1810}
1811
1812static int range_read(struct policydb *p, void *fp)
1813{
1814 struct range_trans *rt = NULL;
1815 struct mls_range *r = NULL;
1816 int i, rc;
1817 __le32 buf[2];
1818 u32 nel;
1819
1820 if (p->policyvers < POLICYDB_VERSION_MLS)
1821 return 0;
1822
1823 rc = next_entry(buf, fp, sizeof(u32));
1824 if (rc)
1825 return rc;
1826
1827 nel = le32_to_cpu(buf[0]);
1828
1829 rc = hashtab_init(&p->range_tr, nel);
1830 if (rc)
1831 return rc;
1832
1833 for (i = 0; i < nel; i++) {
1834 rc = -ENOMEM;
1835 rt = kzalloc(sizeof(*rt), GFP_KERNEL);
1836 if (!rt)
1837 goto out;
1838
1839 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1840 if (rc)
1841 goto out;
1842
1843 rt->source_type = le32_to_cpu(buf[0]);
1844 rt->target_type = le32_to_cpu(buf[1]);
1845 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
1846 rc = next_entry(buf, fp, sizeof(u32));
1847 if (rc)
1848 goto out;
1849 rt->target_class = le32_to_cpu(buf[0]);
1850 } else
1851 rt->target_class = p->process_class;
1852
1853 rc = -EINVAL;
1854 if (!policydb_type_isvalid(p, rt->source_type) ||
1855 !policydb_type_isvalid(p, rt->target_type) ||
1856 !policydb_class_isvalid(p, rt->target_class))
1857 goto out;
1858
1859 rc = -ENOMEM;
1860 r = kzalloc(sizeof(*r), GFP_KERNEL);
1861 if (!r)
1862 goto out;
1863
1864 rc = mls_read_range_helper(r, fp);
1865 if (rc)
1866 goto out;
1867
1868 rc = -EINVAL;
1869 if (!mls_range_isvalid(p, r)) {
1870 pr_warn("SELinux: rangetrans: invalid range\n");
1871 goto out;
1872 }
1873
1874 rc = hashtab_insert(&p->range_tr, rt, r, rangetr_key_params);
1875 if (rc)
1876 goto out;
1877
1878 rt = NULL;
1879 r = NULL;
1880 }
1881 hash_eval(&p->range_tr, "rangetr");
1882 rc = 0;
1883out:
1884 kfree(rt);
1885 kfree(r);
1886 return rc;
1887}
1888
1889static int filename_trans_read_helper_compat(struct policydb *p, void *fp)
1890{
1891 struct filename_trans_key key, *ft = NULL;
1892 struct filename_trans_datum *last, *datum = NULL;
1893 char *name = NULL;
1894 u32 len, stype, otype;
1895 __le32 buf[4];
1896 int rc;
1897
1898
1899 rc = next_entry(buf, fp, sizeof(u32));
1900 if (rc)
1901 return rc;
1902 len = le32_to_cpu(buf[0]);
1903
1904
1905 rc = str_read(&name, GFP_KERNEL, fp, len);
1906 if (rc)
1907 return rc;
1908
1909 rc = next_entry(buf, fp, sizeof(u32) * 4);
1910 if (rc)
1911 goto out;
1912
1913 stype = le32_to_cpu(buf[0]);
1914 key.ttype = le32_to_cpu(buf[1]);
1915 key.tclass = le32_to_cpu(buf[2]);
1916 key.name = name;
1917
1918 otype = le32_to_cpu(buf[3]);
1919
1920 last = NULL;
1921 datum = policydb_filenametr_search(p, &key);
1922 while (datum) {
1923 if (unlikely(ebitmap_get_bit(&datum->stypes, stype - 1))) {
1924
1925 datum = NULL;
1926 goto out;
1927 }
1928 if (likely(datum->otype == otype))
1929 break;
1930 last = datum;
1931 datum = datum->next;
1932 }
1933 if (!datum) {
1934 rc = -ENOMEM;
1935 datum = kmalloc(sizeof(*datum), GFP_KERNEL);
1936 if (!datum)
1937 goto out;
1938
1939 ebitmap_init(&datum->stypes);
1940 datum->otype = otype;
1941 datum->next = NULL;
1942
1943 if (unlikely(last)) {
1944 last->next = datum;
1945 } else {
1946 rc = -ENOMEM;
1947 ft = kmemdup(&key, sizeof(key), GFP_KERNEL);
1948 if (!ft)
1949 goto out;
1950
1951 rc = hashtab_insert(&p->filename_trans, ft, datum,
1952 filenametr_key_params);
1953 if (rc)
1954 goto out;
1955 name = NULL;
1956
1957 rc = ebitmap_set_bit(&p->filename_trans_ttypes,
1958 key.ttype, 1);
1959 if (rc)
1960 return rc;
1961 }
1962 }
1963 kfree(name);
1964 return ebitmap_set_bit(&datum->stypes, stype - 1, 1);
1965
1966out:
1967 kfree(ft);
1968 kfree(name);
1969 kfree(datum);
1970 return rc;
1971}
1972
1973static int filename_trans_read_helper(struct policydb *p, void *fp)
1974{
1975 struct filename_trans_key *ft = NULL;
1976 struct filename_trans_datum **dst, *datum, *first = NULL;
1977 char *name = NULL;
1978 u32 len, ttype, tclass, ndatum, i;
1979 __le32 buf[3];
1980 int rc;
1981
1982
1983 rc = next_entry(buf, fp, sizeof(u32));
1984 if (rc)
1985 return rc;
1986 len = le32_to_cpu(buf[0]);
1987
1988
1989 rc = str_read(&name, GFP_KERNEL, fp, len);
1990 if (rc)
1991 return rc;
1992
1993 rc = next_entry(buf, fp, sizeof(u32) * 3);
1994 if (rc)
1995 goto out;
1996
1997 ttype = le32_to_cpu(buf[0]);
1998 tclass = le32_to_cpu(buf[1]);
1999
2000 ndatum = le32_to_cpu(buf[2]);
2001 if (ndatum == 0) {
2002 pr_err("SELinux: Filename transition key with no datum\n");
2003 rc = -ENOENT;
2004 goto out;
2005 }
2006
2007 dst = &first;
2008 for (i = 0; i < ndatum; i++) {
2009 rc = -ENOMEM;
2010 datum = kmalloc(sizeof(*datum), GFP_KERNEL);
2011 if (!datum)
2012 goto out;
2013
2014 *dst = datum;
2015
2016
2017 rc = ebitmap_read(&datum->stypes, fp);
2018 if (rc)
2019 goto out;
2020
2021 rc = next_entry(buf, fp, sizeof(u32));
2022 if (rc)
2023 goto out;
2024
2025 datum->otype = le32_to_cpu(buf[0]);
2026 datum->next = NULL;
2027
2028 dst = &datum->next;
2029 }
2030
2031 rc = -ENOMEM;
2032 ft = kmalloc(sizeof(*ft), GFP_KERNEL);
2033 if (!ft)
2034 goto out;
2035
2036 ft->ttype = ttype;
2037 ft->tclass = tclass;
2038 ft->name = name;
2039
2040 rc = hashtab_insert(&p->filename_trans, ft, first,
2041 filenametr_key_params);
2042 if (rc == -EEXIST)
2043 pr_err("SELinux: Duplicate filename transition key\n");
2044 if (rc)
2045 goto out;
2046
2047 return ebitmap_set_bit(&p->filename_trans_ttypes, ttype, 1);
2048
2049out:
2050 kfree(ft);
2051 kfree(name);
2052 while (first) {
2053 datum = first;
2054 first = first->next;
2055
2056 ebitmap_destroy(&datum->stypes);
2057 kfree(datum);
2058 }
2059 return rc;
2060}
2061
2062static int filename_trans_read(struct policydb *p, void *fp)
2063{
2064 u32 nel;
2065 __le32 buf[1];
2066 int rc, i;
2067
2068 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
2069 return 0;
2070
2071 rc = next_entry(buf, fp, sizeof(u32));
2072 if (rc)
2073 return rc;
2074 nel = le32_to_cpu(buf[0]);
2075
2076 if (p->policyvers < POLICYDB_VERSION_COMP_FTRANS) {
2077 p->compat_filename_trans_count = nel;
2078
2079 rc = hashtab_init(&p->filename_trans, (1 << 11));
2080 if (rc)
2081 return rc;
2082
2083 for (i = 0; i < nel; i++) {
2084 rc = filename_trans_read_helper_compat(p, fp);
2085 if (rc)
2086 return rc;
2087 }
2088 } else {
2089 rc = hashtab_init(&p->filename_trans, nel);
2090 if (rc)
2091 return rc;
2092
2093 for (i = 0; i < nel; i++) {
2094 rc = filename_trans_read_helper(p, fp);
2095 if (rc)
2096 return rc;
2097 }
2098 }
2099 hash_eval(&p->filename_trans, "filenametr");
2100 return 0;
2101}
2102
2103static int genfs_read(struct policydb *p, void *fp)
2104{
2105 int i, j, rc;
2106 u32 nel, nel2, len, len2;
2107 __le32 buf[1];
2108 struct ocontext *l, *c;
2109 struct ocontext *newc = NULL;
2110 struct genfs *genfs_p, *genfs;
2111 struct genfs *newgenfs = NULL;
2112
2113 rc = next_entry(buf, fp, sizeof(u32));
2114 if (rc)
2115 return rc;
2116 nel = le32_to_cpu(buf[0]);
2117
2118 for (i = 0; i < nel; i++) {
2119 rc = next_entry(buf, fp, sizeof(u32));
2120 if (rc)
2121 goto out;
2122 len = le32_to_cpu(buf[0]);
2123
2124 rc = -ENOMEM;
2125 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
2126 if (!newgenfs)
2127 goto out;
2128
2129 rc = str_read(&newgenfs->fstype, GFP_KERNEL, fp, len);
2130 if (rc)
2131 goto out;
2132
2133 for (genfs_p = NULL, genfs = p->genfs; genfs;
2134 genfs_p = genfs, genfs = genfs->next) {
2135 rc = -EINVAL;
2136 if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
2137 pr_err("SELinux: dup genfs fstype %s\n",
2138 newgenfs->fstype);
2139 goto out;
2140 }
2141 if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
2142 break;
2143 }
2144 newgenfs->next = genfs;
2145 if (genfs_p)
2146 genfs_p->next = newgenfs;
2147 else
2148 p->genfs = newgenfs;
2149 genfs = newgenfs;
2150 newgenfs = NULL;
2151
2152 rc = next_entry(buf, fp, sizeof(u32));
2153 if (rc)
2154 goto out;
2155
2156 nel2 = le32_to_cpu(buf[0]);
2157 for (j = 0; j < nel2; j++) {
2158 rc = next_entry(buf, fp, sizeof(u32));
2159 if (rc)
2160 goto out;
2161 len = le32_to_cpu(buf[0]);
2162
2163 rc = -ENOMEM;
2164 newc = kzalloc(sizeof(*newc), GFP_KERNEL);
2165 if (!newc)
2166 goto out;
2167
2168 rc = str_read(&newc->u.name, GFP_KERNEL, fp, len);
2169 if (rc)
2170 goto out;
2171
2172 rc = next_entry(buf, fp, sizeof(u32));
2173 if (rc)
2174 goto out;
2175
2176 newc->v.sclass = le32_to_cpu(buf[0]);
2177 rc = context_read_and_validate(&newc->context[0], p, fp);
2178 if (rc)
2179 goto out;
2180
2181 for (l = NULL, c = genfs->head; c;
2182 l = c, c = c->next) {
2183 rc = -EINVAL;
2184 if (!strcmp(newc->u.name, c->u.name) &&
2185 (!c->v.sclass || !newc->v.sclass ||
2186 newc->v.sclass == c->v.sclass)) {
2187 pr_err("SELinux: dup genfs entry (%s,%s)\n",
2188 genfs->fstype, c->u.name);
2189 goto out;
2190 }
2191 len = strlen(newc->u.name);
2192 len2 = strlen(c->u.name);
2193 if (len > len2)
2194 break;
2195 }
2196
2197 newc->next = c;
2198 if (l)
2199 l->next = newc;
2200 else
2201 genfs->head = newc;
2202 newc = NULL;
2203 }
2204 }
2205 rc = 0;
2206out:
2207 if (newgenfs) {
2208 kfree(newgenfs->fstype);
2209 kfree(newgenfs);
2210 }
2211 ocontext_destroy(newc, OCON_FSUSE);
2212
2213 return rc;
2214}
2215
2216static int ocontext_read(struct policydb *p, struct policydb_compat_info *info,
2217 void *fp)
2218{
2219 int i, j, rc;
2220 u32 nel, len;
2221 __be64 prefixbuf[1];
2222 __le32 buf[3];
2223 struct ocontext *l, *c;
2224 u32 nodebuf[8];
2225
2226 for (i = 0; i < info->ocon_num; i++) {
2227 rc = next_entry(buf, fp, sizeof(u32));
2228 if (rc)
2229 goto out;
2230 nel = le32_to_cpu(buf[0]);
2231
2232 l = NULL;
2233 for (j = 0; j < nel; j++) {
2234 rc = -ENOMEM;
2235 c = kzalloc(sizeof(*c), GFP_KERNEL);
2236 if (!c)
2237 goto out;
2238 if (l)
2239 l->next = c;
2240 else
2241 p->ocontexts[i] = c;
2242 l = c;
2243
2244 switch (i) {
2245 case OCON_ISID:
2246 rc = next_entry(buf, fp, sizeof(u32));
2247 if (rc)
2248 goto out;
2249
2250 c->sid[0] = le32_to_cpu(buf[0]);
2251 rc = context_read_and_validate(&c->context[0], p, fp);
2252 if (rc)
2253 goto out;
2254 break;
2255 case OCON_FS:
2256 case OCON_NETIF:
2257 rc = next_entry(buf, fp, sizeof(u32));
2258 if (rc)
2259 goto out;
2260 len = le32_to_cpu(buf[0]);
2261
2262 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2263 if (rc)
2264 goto out;
2265
2266 rc = context_read_and_validate(&c->context[0], p, fp);
2267 if (rc)
2268 goto out;
2269 rc = context_read_and_validate(&c->context[1], p, fp);
2270 if (rc)
2271 goto out;
2272 break;
2273 case OCON_PORT:
2274 rc = next_entry(buf, fp, sizeof(u32)*3);
2275 if (rc)
2276 goto out;
2277 c->u.port.protocol = le32_to_cpu(buf[0]);
2278 c->u.port.low_port = le32_to_cpu(buf[1]);
2279 c->u.port.high_port = le32_to_cpu(buf[2]);
2280 rc = context_read_and_validate(&c->context[0], p, fp);
2281 if (rc)
2282 goto out;
2283 break;
2284 case OCON_NODE:
2285 rc = next_entry(nodebuf, fp, sizeof(u32) * 2);
2286 if (rc)
2287 goto out;
2288 c->u.node.addr = nodebuf[0];
2289 c->u.node.mask = nodebuf[1];
2290 rc = context_read_and_validate(&c->context[0], p, fp);
2291 if (rc)
2292 goto out;
2293 break;
2294 case OCON_FSUSE:
2295 rc = next_entry(buf, fp, sizeof(u32)*2);
2296 if (rc)
2297 goto out;
2298
2299 rc = -EINVAL;
2300 c->v.behavior = le32_to_cpu(buf[0]);
2301
2302 if (c->v.behavior == SECURITY_FS_USE_MNTPOINT)
2303 goto out;
2304 if (c->v.behavior > SECURITY_FS_USE_MAX)
2305 goto out;
2306
2307 len = le32_to_cpu(buf[1]);
2308 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2309 if (rc)
2310 goto out;
2311
2312 rc = context_read_and_validate(&c->context[0], p, fp);
2313 if (rc)
2314 goto out;
2315 break;
2316 case OCON_NODE6: {
2317 int k;
2318
2319 rc = next_entry(nodebuf, fp, sizeof(u32) * 8);
2320 if (rc)
2321 goto out;
2322 for (k = 0; k < 4; k++)
2323 c->u.node6.addr[k] = nodebuf[k];
2324 for (k = 0; k < 4; k++)
2325 c->u.node6.mask[k] = nodebuf[k+4];
2326 rc = context_read_and_validate(&c->context[0], p, fp);
2327 if (rc)
2328 goto out;
2329 break;
2330 }
2331 case OCON_IBPKEY: {
2332 u32 pkey_lo, pkey_hi;
2333
2334 rc = next_entry(prefixbuf, fp, sizeof(u64));
2335 if (rc)
2336 goto out;
2337
2338
2339 c->u.ibpkey.subnet_prefix = be64_to_cpu(prefixbuf[0]);
2340
2341 rc = next_entry(buf, fp, sizeof(u32) * 2);
2342 if (rc)
2343 goto out;
2344
2345 pkey_lo = le32_to_cpu(buf[0]);
2346 pkey_hi = le32_to_cpu(buf[1]);
2347
2348 if (pkey_lo > U16_MAX || pkey_hi > U16_MAX) {
2349 rc = -EINVAL;
2350 goto out;
2351 }
2352
2353 c->u.ibpkey.low_pkey = pkey_lo;
2354 c->u.ibpkey.high_pkey = pkey_hi;
2355
2356 rc = context_read_and_validate(&c->context[0],
2357 p,
2358 fp);
2359 if (rc)
2360 goto out;
2361 break;
2362 }
2363 case OCON_IBENDPORT: {
2364 u32 port;
2365
2366 rc = next_entry(buf, fp, sizeof(u32) * 2);
2367 if (rc)
2368 goto out;
2369 len = le32_to_cpu(buf[0]);
2370
2371 rc = str_read(&c->u.ibendport.dev_name, GFP_KERNEL, fp, len);
2372 if (rc)
2373 goto out;
2374
2375 port = le32_to_cpu(buf[1]);
2376 if (port > U8_MAX || port == 0) {
2377 rc = -EINVAL;
2378 goto out;
2379 }
2380
2381 c->u.ibendport.port = port;
2382
2383 rc = context_read_and_validate(&c->context[0],
2384 p,
2385 fp);
2386 if (rc)
2387 goto out;
2388 break;
2389 }
2390 }
2391 }
2392 }
2393 rc = 0;
2394out:
2395 return rc;
2396}
2397
2398
2399
2400
2401
2402int policydb_read(struct policydb *p, void *fp)
2403{
2404 struct role_allow *ra, *lra;
2405 struct role_trans_key *rtk = NULL;
2406 struct role_trans_datum *rtd = NULL;
2407 int i, j, rc;
2408 __le32 buf[4];
2409 u32 len, nprim, nel, perm;
2410
2411 char *policydb_str;
2412 struct policydb_compat_info *info;
2413
2414 policydb_init(p);
2415
2416
2417 rc = next_entry(buf, fp, sizeof(u32) * 2);
2418 if (rc)
2419 goto bad;
2420
2421 rc = -EINVAL;
2422 if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
2423 pr_err("SELinux: policydb magic number 0x%x does "
2424 "not match expected magic number 0x%x\n",
2425 le32_to_cpu(buf[0]), POLICYDB_MAGIC);
2426 goto bad;
2427 }
2428
2429 rc = -EINVAL;
2430 len = le32_to_cpu(buf[1]);
2431 if (len != strlen(POLICYDB_STRING)) {
2432 pr_err("SELinux: policydb string length %d does not "
2433 "match expected length %zu\n",
2434 len, strlen(POLICYDB_STRING));
2435 goto bad;
2436 }
2437
2438 rc = -ENOMEM;
2439 policydb_str = kmalloc(len + 1, GFP_KERNEL);
2440 if (!policydb_str) {
2441 pr_err("SELinux: unable to allocate memory for policydb "
2442 "string of length %d\n", len);
2443 goto bad;
2444 }
2445
2446 rc = next_entry(policydb_str, fp, len);
2447 if (rc) {
2448 pr_err("SELinux: truncated policydb string identifier\n");
2449 kfree(policydb_str);
2450 goto bad;
2451 }
2452
2453 rc = -EINVAL;
2454 policydb_str[len] = '\0';
2455 if (strcmp(policydb_str, POLICYDB_STRING)) {
2456 pr_err("SELinux: policydb string %s does not match "
2457 "my string %s\n", policydb_str, POLICYDB_STRING);
2458 kfree(policydb_str);
2459 goto bad;
2460 }
2461
2462 kfree(policydb_str);
2463 policydb_str = NULL;
2464
2465
2466 rc = next_entry(buf, fp, sizeof(u32)*4);
2467 if (rc)
2468 goto bad;
2469
2470 rc = -EINVAL;
2471 p->policyvers = le32_to_cpu(buf[0]);
2472 if (p->policyvers < POLICYDB_VERSION_MIN ||
2473 p->policyvers > POLICYDB_VERSION_MAX) {
2474 pr_err("SELinux: policydb version %d does not match "
2475 "my version range %d-%d\n",
2476 le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
2477 goto bad;
2478 }
2479
2480 if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
2481 p->mls_enabled = 1;
2482
2483 rc = -EINVAL;
2484 if (p->policyvers < POLICYDB_VERSION_MLS) {
2485 pr_err("SELinux: security policydb version %d "
2486 "(MLS) not backwards compatible\n",
2487 p->policyvers);
2488 goto bad;
2489 }
2490 }
2491 p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
2492 p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
2493
2494 if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
2495 rc = ebitmap_read(&p->policycaps, fp);
2496 if (rc)
2497 goto bad;
2498 }
2499
2500 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
2501 rc = ebitmap_read(&p->permissive_map, fp);
2502 if (rc)
2503 goto bad;
2504 }
2505
2506 rc = -EINVAL;
2507 info = policydb_lookup_compat(p->policyvers);
2508 if (!info) {
2509 pr_err("SELinux: unable to find policy compat info "
2510 "for version %d\n", p->policyvers);
2511 goto bad;
2512 }
2513
2514 rc = -EINVAL;
2515 if (le32_to_cpu(buf[2]) != info->sym_num ||
2516 le32_to_cpu(buf[3]) != info->ocon_num) {
2517 pr_err("SELinux: policydb table sizes (%d,%d) do "
2518 "not match mine (%d,%d)\n", le32_to_cpu(buf[2]),
2519 le32_to_cpu(buf[3]),
2520 info->sym_num, info->ocon_num);
2521 goto bad;
2522 }
2523
2524 for (i = 0; i < info->sym_num; i++) {
2525 rc = next_entry(buf, fp, sizeof(u32)*2);
2526 if (rc)
2527 goto bad;
2528 nprim = le32_to_cpu(buf[0]);
2529 nel = le32_to_cpu(buf[1]);
2530
2531 rc = symtab_init(&p->symtab[i], nel);
2532 if (rc)
2533 goto out;
2534
2535 if (i == SYM_ROLES) {
2536 rc = roles_init(p);
2537 if (rc)
2538 goto out;
2539 }
2540
2541 for (j = 0; j < nel; j++) {
2542 rc = read_f[i](p, &p->symtab[i], fp);
2543 if (rc)
2544 goto bad;
2545 }
2546
2547 p->symtab[i].nprim = nprim;
2548 }
2549
2550 rc = -EINVAL;
2551 p->process_class = string_to_security_class(p, "process");
2552 if (!p->process_class) {
2553 pr_err("SELinux: process class is required, not defined in policy\n");
2554 goto bad;
2555 }
2556
2557 rc = avtab_read(&p->te_avtab, fp, p);
2558 if (rc)
2559 goto bad;
2560
2561 if (p->policyvers >= POLICYDB_VERSION_BOOL) {
2562 rc = cond_read_list(p, fp);
2563 if (rc)
2564 goto bad;
2565 }
2566
2567 rc = next_entry(buf, fp, sizeof(u32));
2568 if (rc)
2569 goto bad;
2570 nel = le32_to_cpu(buf[0]);
2571
2572 rc = hashtab_init(&p->role_tr, nel);
2573 if (rc)
2574 goto bad;
2575 for (i = 0; i < nel; i++) {
2576 rc = -ENOMEM;
2577 rtk = kmalloc(sizeof(*rtk), GFP_KERNEL);
2578 if (!rtk)
2579 goto bad;
2580
2581 rc = -ENOMEM;
2582 rtd = kmalloc(sizeof(*rtd), GFP_KERNEL);
2583 if (!rtd)
2584 goto bad;
2585
2586 rc = next_entry(buf, fp, sizeof(u32)*3);
2587 if (rc)
2588 goto bad;
2589
2590 rtk->role = le32_to_cpu(buf[0]);
2591 rtk->type = le32_to_cpu(buf[1]);
2592 rtd->new_role = le32_to_cpu(buf[2]);
2593 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2594 rc = next_entry(buf, fp, sizeof(u32));
2595 if (rc)
2596 goto bad;
2597 rtk->tclass = le32_to_cpu(buf[0]);
2598 } else
2599 rtk->tclass = p->process_class;
2600
2601 rc = -EINVAL;
2602 if (!policydb_role_isvalid(p, rtk->role) ||
2603 !policydb_type_isvalid(p, rtk->type) ||
2604 !policydb_class_isvalid(p, rtk->tclass) ||
2605 !policydb_role_isvalid(p, rtd->new_role))
2606 goto bad;
2607
2608 rc = hashtab_insert(&p->role_tr, rtk, rtd, roletr_key_params);
2609 if (rc)
2610 goto bad;
2611
2612 rtk = NULL;
2613 rtd = NULL;
2614 }
2615
2616 rc = next_entry(buf, fp, sizeof(u32));
2617 if (rc)
2618 goto bad;
2619 nel = le32_to_cpu(buf[0]);
2620 lra = NULL;
2621 for (i = 0; i < nel; i++) {
2622 rc = -ENOMEM;
2623 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
2624 if (!ra)
2625 goto bad;
2626 if (lra)
2627 lra->next = ra;
2628 else
2629 p->role_allow = ra;
2630 rc = next_entry(buf, fp, sizeof(u32)*2);
2631 if (rc)
2632 goto bad;
2633
2634 rc = -EINVAL;
2635 ra->role = le32_to_cpu(buf[0]);
2636 ra->new_role = le32_to_cpu(buf[1]);
2637 if (!policydb_role_isvalid(p, ra->role) ||
2638 !policydb_role_isvalid(p, ra->new_role))
2639 goto bad;
2640 lra = ra;
2641 }
2642
2643 rc = filename_trans_read(p, fp);
2644 if (rc)
2645 goto bad;
2646
2647 rc = policydb_index(p);
2648 if (rc)
2649 goto bad;
2650
2651 rc = -EINVAL;
2652 perm = string_to_av_perm(p, p->process_class, "transition");
2653 if (!perm) {
2654 pr_err("SELinux: process transition permission is required, not defined in policy\n");
2655 goto bad;
2656 }
2657 p->process_trans_perms = perm;
2658 perm = string_to_av_perm(p, p->process_class, "dyntransition");
2659 if (!perm) {
2660 pr_err("SELinux: process dyntransition permission is required, not defined in policy\n");
2661 goto bad;
2662 }
2663 p->process_trans_perms |= perm;
2664
2665 rc = ocontext_read(p, info, fp);
2666 if (rc)
2667 goto bad;
2668
2669 rc = genfs_read(p, fp);
2670 if (rc)
2671 goto bad;
2672
2673 rc = range_read(p, fp);
2674 if (rc)
2675 goto bad;
2676
2677 rc = -ENOMEM;
2678 p->type_attr_map_array = kvcalloc(p->p_types.nprim,
2679 sizeof(*p->type_attr_map_array),
2680 GFP_KERNEL);
2681 if (!p->type_attr_map_array)
2682 goto bad;
2683
2684
2685 for (i = 0; i < p->p_types.nprim; i++)
2686 ebitmap_init(&p->type_attr_map_array[i]);
2687
2688 for (i = 0; i < p->p_types.nprim; i++) {
2689 struct ebitmap *e = &p->type_attr_map_array[i];
2690
2691 if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
2692 rc = ebitmap_read(e, fp);
2693 if (rc)
2694 goto bad;
2695 }
2696
2697 rc = ebitmap_set_bit(e, i, 1);
2698 if (rc)
2699 goto bad;
2700 }
2701
2702 rc = policydb_bounds_sanity_check(p);
2703 if (rc)
2704 goto bad;
2705
2706 rc = 0;
2707out:
2708 return rc;
2709bad:
2710 kfree(rtk);
2711 kfree(rtd);
2712 policydb_destroy(p);
2713 goto out;
2714}
2715
2716
2717
2718
2719
2720static int mls_write_level(struct mls_level *l, void *fp)
2721{
2722 __le32 buf[1];
2723 int rc;
2724
2725 buf[0] = cpu_to_le32(l->sens);
2726 rc = put_entry(buf, sizeof(u32), 1, fp);
2727 if (rc)
2728 return rc;
2729
2730 rc = ebitmap_write(&l->cat, fp);
2731 if (rc)
2732 return rc;
2733
2734 return 0;
2735}
2736
2737
2738
2739
2740
2741static int mls_write_range_helper(struct mls_range *r, void *fp)
2742{
2743 __le32 buf[3];
2744 size_t items;
2745 int rc, eq;
2746
2747 eq = mls_level_eq(&r->level[1], &r->level[0]);
2748
2749 if (eq)
2750 items = 2;
2751 else
2752 items = 3;
2753 buf[0] = cpu_to_le32(items-1);
2754 buf[1] = cpu_to_le32(r->level[0].sens);
2755 if (!eq)
2756 buf[2] = cpu_to_le32(r->level[1].sens);
2757
2758 BUG_ON(items > ARRAY_SIZE(buf));
2759
2760 rc = put_entry(buf, sizeof(u32), items, fp);
2761 if (rc)
2762 return rc;
2763
2764 rc = ebitmap_write(&r->level[0].cat, fp);
2765 if (rc)
2766 return rc;
2767 if (!eq) {
2768 rc = ebitmap_write(&r->level[1].cat, fp);
2769 if (rc)
2770 return rc;
2771 }
2772
2773 return 0;
2774}
2775
2776static int sens_write(void *vkey, void *datum, void *ptr)
2777{
2778 char *key = vkey;
2779 struct level_datum *levdatum = datum;
2780 struct policy_data *pd = ptr;
2781 void *fp = pd->fp;
2782 __le32 buf[2];
2783 size_t len;
2784 int rc;
2785
2786 len = strlen(key);
2787 buf[0] = cpu_to_le32(len);
2788 buf[1] = cpu_to_le32(levdatum->isalias);
2789 rc = put_entry(buf, sizeof(u32), 2, fp);
2790 if (rc)
2791 return rc;
2792
2793 rc = put_entry(key, 1, len, fp);
2794 if (rc)
2795 return rc;
2796
2797 rc = mls_write_level(levdatum->level, fp);
2798 if (rc)
2799 return rc;
2800
2801 return 0;
2802}
2803
2804static int cat_write(void *vkey, void *datum, void *ptr)
2805{
2806 char *key = vkey;
2807 struct cat_datum *catdatum = datum;
2808 struct policy_data *pd = ptr;
2809 void *fp = pd->fp;
2810 __le32 buf[3];
2811 size_t len;
2812 int rc;
2813
2814 len = strlen(key);
2815 buf[0] = cpu_to_le32(len);
2816 buf[1] = cpu_to_le32(catdatum->value);
2817 buf[2] = cpu_to_le32(catdatum->isalias);
2818 rc = put_entry(buf, sizeof(u32), 3, fp);
2819 if (rc)
2820 return rc;
2821
2822 rc = put_entry(key, 1, len, fp);
2823 if (rc)
2824 return rc;
2825
2826 return 0;
2827}
2828
2829static int role_trans_write_one(void *key, void *datum, void *ptr)
2830{
2831 struct role_trans_key *rtk = key;
2832 struct role_trans_datum *rtd = datum;
2833 struct policy_data *pd = ptr;
2834 void *fp = pd->fp;
2835 struct policydb *p = pd->p;
2836 __le32 buf[3];
2837 int rc;
2838
2839 buf[0] = cpu_to_le32(rtk->role);
2840 buf[1] = cpu_to_le32(rtk->type);
2841 buf[2] = cpu_to_le32(rtd->new_role);
2842 rc = put_entry(buf, sizeof(u32), 3, fp);
2843 if (rc)
2844 return rc;
2845 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2846 buf[0] = cpu_to_le32(rtk->tclass);
2847 rc = put_entry(buf, sizeof(u32), 1, fp);
2848 if (rc)
2849 return rc;
2850 }
2851 return 0;
2852}
2853
2854static int role_trans_write(struct policydb *p, void *fp)
2855{
2856 struct policy_data pd = { .p = p, .fp = fp };
2857 __le32 buf[1];
2858 int rc;
2859
2860 buf[0] = cpu_to_le32(p->role_tr.nel);
2861 rc = put_entry(buf, sizeof(u32), 1, fp);
2862 if (rc)
2863 return rc;
2864
2865 return hashtab_map(&p->role_tr, role_trans_write_one, &pd);
2866}
2867
2868static int role_allow_write(struct role_allow *r, void *fp)
2869{
2870 struct role_allow *ra;
2871 __le32 buf[2];
2872 size_t nel;
2873 int rc;
2874
2875 nel = 0;
2876 for (ra = r; ra; ra = ra->next)
2877 nel++;
2878 buf[0] = cpu_to_le32(nel);
2879 rc = put_entry(buf, sizeof(u32), 1, fp);
2880 if (rc)
2881 return rc;
2882 for (ra = r; ra; ra = ra->next) {
2883 buf[0] = cpu_to_le32(ra->role);
2884 buf[1] = cpu_to_le32(ra->new_role);
2885 rc = put_entry(buf, sizeof(u32), 2, fp);
2886 if (rc)
2887 return rc;
2888 }
2889 return 0;
2890}
2891
2892
2893
2894
2895
2896static int context_write(struct policydb *p, struct context *c,
2897 void *fp)
2898{
2899 int rc;
2900 __le32 buf[3];
2901
2902 buf[0] = cpu_to_le32(c->user);
2903 buf[1] = cpu_to_le32(c->role);
2904 buf[2] = cpu_to_le32(c->type);
2905
2906 rc = put_entry(buf, sizeof(u32), 3, fp);
2907 if (rc)
2908 return rc;
2909
2910 rc = mls_write_range_helper(&c->range, fp);
2911 if (rc)
2912 return rc;
2913
2914 return 0;
2915}
2916
2917
2918
2919
2920
2921
2922
2923static int perm_write(void *vkey, void *datum, void *fp)
2924{
2925 char *key = vkey;
2926 struct perm_datum *perdatum = datum;
2927 __le32 buf[2];
2928 size_t len;
2929 int rc;
2930
2931 len = strlen(key);
2932 buf[0] = cpu_to_le32(len);
2933 buf[1] = cpu_to_le32(perdatum->value);
2934 rc = put_entry(buf, sizeof(u32), 2, fp);
2935 if (rc)
2936 return rc;
2937
2938 rc = put_entry(key, 1, len, fp);
2939 if (rc)
2940 return rc;
2941
2942 return 0;
2943}
2944
2945static int common_write(void *vkey, void *datum, void *ptr)
2946{
2947 char *key = vkey;
2948 struct common_datum *comdatum = datum;
2949 struct policy_data *pd = ptr;
2950 void *fp = pd->fp;
2951 __le32 buf[4];
2952 size_t len;
2953 int rc;
2954
2955 len = strlen(key);
2956 buf[0] = cpu_to_le32(len);
2957 buf[1] = cpu_to_le32(comdatum->value);
2958 buf[2] = cpu_to_le32(comdatum->permissions.nprim);
2959 buf[3] = cpu_to_le32(comdatum->permissions.table.nel);
2960 rc = put_entry(buf, sizeof(u32), 4, fp);
2961 if (rc)
2962 return rc;
2963
2964 rc = put_entry(key, 1, len, fp);
2965 if (rc)
2966 return rc;
2967
2968 rc = hashtab_map(&comdatum->permissions.table, perm_write, fp);
2969 if (rc)
2970 return rc;
2971
2972 return 0;
2973}
2974
2975static int type_set_write(struct type_set *t, void *fp)
2976{
2977 int rc;
2978 __le32 buf[1];
2979
2980 if (ebitmap_write(&t->types, fp))
2981 return -EINVAL;
2982 if (ebitmap_write(&t->negset, fp))
2983 return -EINVAL;
2984
2985 buf[0] = cpu_to_le32(t->flags);
2986 rc = put_entry(buf, sizeof(u32), 1, fp);
2987 if (rc)
2988 return -EINVAL;
2989
2990 return 0;
2991}
2992
2993static int write_cons_helper(struct policydb *p, struct constraint_node *node,
2994 void *fp)
2995{
2996 struct constraint_node *c;
2997 struct constraint_expr *e;
2998 __le32 buf[3];
2999 u32 nel;
3000 int rc;
3001
3002 for (c = node; c; c = c->next) {
3003 nel = 0;
3004 for (e = c->expr; e; e = e->next)
3005 nel++;
3006 buf[0] = cpu_to_le32(c->permissions);
3007 buf[1] = cpu_to_le32(nel);
3008 rc = put_entry(buf, sizeof(u32), 2, fp);
3009 if (rc)
3010 return rc;
3011 for (e = c->expr; e; e = e->next) {
3012 buf[0] = cpu_to_le32(e->expr_type);
3013 buf[1] = cpu_to_le32(e->attr);
3014 buf[2] = cpu_to_le32(e->op);
3015 rc = put_entry(buf, sizeof(u32), 3, fp);
3016 if (rc)
3017 return rc;
3018
3019 switch (e->expr_type) {
3020 case CEXPR_NAMES:
3021 rc = ebitmap_write(&e->names, fp);
3022 if (rc)
3023 return rc;
3024 if (p->policyvers >=
3025 POLICYDB_VERSION_CONSTRAINT_NAMES) {
3026 rc = type_set_write(e->type_names, fp);
3027 if (rc)
3028 return rc;
3029 }
3030 break;
3031 default:
3032 break;
3033 }
3034 }
3035 }
3036
3037 return 0;
3038}
3039
3040static int class_write(void *vkey, void *datum, void *ptr)
3041{
3042 char *key = vkey;
3043 struct class_datum *cladatum = datum;
3044 struct policy_data *pd = ptr;
3045 void *fp = pd->fp;
3046 struct policydb *p = pd->p;
3047 struct constraint_node *c;
3048 __le32 buf[6];
3049 u32 ncons;
3050 size_t len, len2;
3051 int rc;
3052
3053 len = strlen(key);
3054 if (cladatum->comkey)
3055 len2 = strlen(cladatum->comkey);
3056 else
3057 len2 = 0;
3058
3059 ncons = 0;
3060 for (c = cladatum->constraints; c; c = c->next)
3061 ncons++;
3062
3063 buf[0] = cpu_to_le32(len);
3064 buf[1] = cpu_to_le32(len2);
3065 buf[2] = cpu_to_le32(cladatum->value);
3066 buf[3] = cpu_to_le32(cladatum->permissions.nprim);
3067 buf[4] = cpu_to_le32(cladatum->permissions.table.nel);
3068 buf[5] = cpu_to_le32(ncons);
3069 rc = put_entry(buf, sizeof(u32), 6, fp);
3070 if (rc)
3071 return rc;
3072
3073 rc = put_entry(key, 1, len, fp);
3074 if (rc)
3075 return rc;
3076
3077 if (cladatum->comkey) {
3078 rc = put_entry(cladatum->comkey, 1, len2, fp);
3079 if (rc)
3080 return rc;
3081 }
3082
3083 rc = hashtab_map(&cladatum->permissions.table, perm_write, fp);
3084 if (rc)
3085 return rc;
3086
3087 rc = write_cons_helper(p, cladatum->constraints, fp);
3088 if (rc)
3089 return rc;
3090
3091
3092 ncons = 0;
3093 for (c = cladatum->validatetrans; c; c = c->next)
3094 ncons++;
3095
3096 buf[0] = cpu_to_le32(ncons);
3097 rc = put_entry(buf, sizeof(u32), 1, fp);
3098 if (rc)
3099 return rc;
3100
3101 rc = write_cons_helper(p, cladatum->validatetrans, fp);
3102 if (rc)
3103 return rc;
3104
3105 if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
3106 buf[0] = cpu_to_le32(cladatum->default_user);
3107 buf[1] = cpu_to_le32(cladatum->default_role);
3108 buf[2] = cpu_to_le32(cladatum->default_range);
3109
3110 rc = put_entry(buf, sizeof(uint32_t), 3, fp);
3111 if (rc)
3112 return rc;
3113 }
3114
3115 if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
3116 buf[0] = cpu_to_le32(cladatum->default_type);
3117 rc = put_entry(buf, sizeof(uint32_t), 1, fp);
3118 if (rc)
3119 return rc;
3120 }
3121
3122 return 0;
3123}
3124
3125static int role_write(void *vkey, void *datum, void *ptr)
3126{
3127 char *key = vkey;
3128 struct role_datum *role = datum;
3129 struct policy_data *pd = ptr;
3130 void *fp = pd->fp;
3131 struct policydb *p = pd->p;
3132 __le32 buf[3];
3133 size_t items, len;
3134 int rc;
3135
3136 len = strlen(key);
3137 items = 0;
3138 buf[items++] = cpu_to_le32(len);
3139 buf[items++] = cpu_to_le32(role->value);
3140 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
3141 buf[items++] = cpu_to_le32(role->bounds);
3142
3143 BUG_ON(items > ARRAY_SIZE(buf));
3144
3145 rc = put_entry(buf, sizeof(u32), items, fp);
3146 if (rc)
3147 return rc;
3148
3149 rc = put_entry(key, 1, len, fp);
3150 if (rc)
3151 return rc;
3152
3153 rc = ebitmap_write(&role->dominates, fp);
3154 if (rc)
3155 return rc;
3156
3157 rc = ebitmap_write(&role->types, fp);
3158 if (rc)
3159 return rc;
3160
3161 return 0;
3162}
3163
3164static int type_write(void *vkey, void *datum, void *ptr)
3165{
3166 char *key = vkey;
3167 struct type_datum *typdatum = datum;
3168 struct policy_data *pd = ptr;
3169 struct policydb *p = pd->p;
3170 void *fp = pd->fp;
3171 __le32 buf[4];
3172 int rc;
3173 size_t items, len;
3174
3175 len = strlen(key);
3176 items = 0;
3177 buf[items++] = cpu_to_le32(len);
3178 buf[items++] = cpu_to_le32(typdatum->value);
3179 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
3180 u32 properties = 0;
3181
3182 if (typdatum->primary)
3183 properties |= TYPEDATUM_PROPERTY_PRIMARY;
3184
3185 if (typdatum->attribute)
3186 properties |= TYPEDATUM_PROPERTY_ATTRIBUTE;
3187
3188 buf[items++] = cpu_to_le32(properties);
3189 buf[items++] = cpu_to_le32(typdatum->bounds);
3190 } else {
3191 buf[items++] = cpu_to_le32(typdatum->primary);
3192 }
3193 BUG_ON(items > ARRAY_SIZE(buf));
3194 rc = put_entry(buf, sizeof(u32), items, fp);
3195 if (rc)
3196 return rc;
3197
3198 rc = put_entry(key, 1, len, fp);
3199 if (rc)
3200 return rc;
3201
3202 return 0;
3203}
3204
3205static int user_write(void *vkey, void *datum, void *ptr)
3206{
3207 char *key = vkey;
3208 struct user_datum *usrdatum = datum;
3209 struct policy_data *pd = ptr;
3210 struct policydb *p = pd->p;
3211 void *fp = pd->fp;
3212 __le32 buf[3];
3213 size_t items, len;
3214 int rc;
3215
3216 len = strlen(key);
3217 items = 0;
3218 buf[items++] = cpu_to_le32(len);
3219 buf[items++] = cpu_to_le32(usrdatum->value);
3220 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
3221 buf[items++] = cpu_to_le32(usrdatum->bounds);
3222 BUG_ON(items > ARRAY_SIZE(buf));
3223 rc = put_entry(buf, sizeof(u32), items, fp);
3224 if (rc)
3225 return rc;
3226
3227 rc = put_entry(key, 1, len, fp);
3228 if (rc)
3229 return rc;
3230
3231 rc = ebitmap_write(&usrdatum->roles, fp);
3232 if (rc)
3233 return rc;
3234
3235 rc = mls_write_range_helper(&usrdatum->range, fp);
3236 if (rc)
3237 return rc;
3238
3239 rc = mls_write_level(&usrdatum->dfltlevel, fp);
3240 if (rc)
3241 return rc;
3242
3243 return 0;
3244}
3245
3246static int (*write_f[SYM_NUM]) (void *key, void *datum,
3247 void *datap) =
3248{
3249 common_write,
3250 class_write,
3251 role_write,
3252 type_write,
3253 user_write,
3254 cond_write_bool,
3255 sens_write,
3256 cat_write,
3257};
3258
3259static int ocontext_write(struct policydb *p, struct policydb_compat_info *info,
3260 void *fp)
3261{
3262 unsigned int i, j, rc;
3263 size_t nel, len;
3264 __be64 prefixbuf[1];
3265 __le32 buf[3];
3266 u32 nodebuf[8];
3267 struct ocontext *c;
3268 for (i = 0; i < info->ocon_num; i++) {
3269 nel = 0;
3270 for (c = p->ocontexts[i]; c; c = c->next)
3271 nel++;
3272 buf[0] = cpu_to_le32(nel);
3273 rc = put_entry(buf, sizeof(u32), 1, fp);
3274 if (rc)
3275 return rc;
3276 for (c = p->ocontexts[i]; c; c = c->next) {
3277 switch (i) {
3278 case OCON_ISID:
3279 buf[0] = cpu_to_le32(c->sid[0]);
3280 rc = put_entry(buf, sizeof(u32), 1, fp);
3281 if (rc)
3282 return rc;
3283 rc = context_write(p, &c->context[0], fp);
3284 if (rc)
3285 return rc;
3286 break;
3287 case OCON_FS:
3288 case OCON_NETIF:
3289 len = strlen(c->u.name);
3290 buf[0] = cpu_to_le32(len);
3291 rc = put_entry(buf, sizeof(u32), 1, fp);
3292 if (rc)
3293 return rc;
3294 rc = put_entry(c->u.name, 1, len, fp);
3295 if (rc)
3296 return rc;
3297 rc = context_write(p, &c->context[0], fp);
3298 if (rc)
3299 return rc;
3300 rc = context_write(p, &c->context[1], fp);
3301 if (rc)
3302 return rc;
3303 break;
3304 case OCON_PORT:
3305 buf[0] = cpu_to_le32(c->u.port.protocol);
3306 buf[1] = cpu_to_le32(c->u.port.low_port);
3307 buf[2] = cpu_to_le32(c->u.port.high_port);
3308 rc = put_entry(buf, sizeof(u32), 3, fp);
3309 if (rc)
3310 return rc;
3311 rc = context_write(p, &c->context[0], fp);
3312 if (rc)
3313 return rc;
3314 break;
3315 case OCON_NODE:
3316 nodebuf[0] = c->u.node.addr;
3317 nodebuf[1] = c->u.node.mask;
3318 rc = put_entry(nodebuf, sizeof(u32), 2, fp);
3319 if (rc)
3320 return rc;
3321 rc = context_write(p, &c->context[0], fp);
3322 if (rc)
3323 return rc;
3324 break;
3325 case OCON_FSUSE:
3326 buf[0] = cpu_to_le32(c->v.behavior);
3327 len = strlen(c->u.name);
3328 buf[1] = cpu_to_le32(len);
3329 rc = put_entry(buf, sizeof(u32), 2, fp);
3330 if (rc)
3331 return rc;
3332 rc = put_entry(c->u.name, 1, len, fp);
3333 if (rc)
3334 return rc;
3335 rc = context_write(p, &c->context[0], fp);
3336 if (rc)
3337 return rc;
3338 break;
3339 case OCON_NODE6:
3340 for (j = 0; j < 4; j++)
3341 nodebuf[j] = c->u.node6.addr[j];
3342 for (j = 0; j < 4; j++)
3343 nodebuf[j + 4] = c->u.node6.mask[j];
3344 rc = put_entry(nodebuf, sizeof(u32), 8, fp);
3345 if (rc)
3346 return rc;
3347 rc = context_write(p, &c->context[0], fp);
3348 if (rc)
3349 return rc;
3350 break;
3351 case OCON_IBPKEY:
3352
3353 prefixbuf[0] = cpu_to_be64(c->u.ibpkey.subnet_prefix);
3354
3355 rc = put_entry(prefixbuf, sizeof(u64), 1, fp);
3356 if (rc)
3357 return rc;
3358
3359 buf[0] = cpu_to_le32(c->u.ibpkey.low_pkey);
3360 buf[1] = cpu_to_le32(c->u.ibpkey.high_pkey);
3361
3362 rc = put_entry(buf, sizeof(u32), 2, fp);
3363 if (rc)
3364 return rc;
3365 rc = context_write(p, &c->context[0], fp);
3366 if (rc)
3367 return rc;
3368 break;
3369 case OCON_IBENDPORT:
3370 len = strlen(c->u.ibendport.dev_name);
3371 buf[0] = cpu_to_le32(len);
3372 buf[1] = cpu_to_le32(c->u.ibendport.port);
3373 rc = put_entry(buf, sizeof(u32), 2, fp);
3374 if (rc)
3375 return rc;
3376 rc = put_entry(c->u.ibendport.dev_name, 1, len, fp);
3377 if (rc)
3378 return rc;
3379 rc = context_write(p, &c->context[0], fp);
3380 if (rc)
3381 return rc;
3382 break;
3383 }
3384 }
3385 }
3386 return 0;
3387}
3388
3389static int genfs_write(struct policydb *p, void *fp)
3390{
3391 struct genfs *genfs;
3392 struct ocontext *c;
3393 size_t len;
3394 __le32 buf[1];
3395 int rc;
3396
3397 len = 0;
3398 for (genfs = p->genfs; genfs; genfs = genfs->next)
3399 len++;
3400 buf[0] = cpu_to_le32(len);
3401 rc = put_entry(buf, sizeof(u32), 1, fp);
3402 if (rc)
3403 return rc;
3404 for (genfs = p->genfs; genfs; genfs = genfs->next) {
3405 len = strlen(genfs->fstype);
3406 buf[0] = cpu_to_le32(len);
3407 rc = put_entry(buf, sizeof(u32), 1, fp);
3408 if (rc)
3409 return rc;
3410 rc = put_entry(genfs->fstype, 1, len, fp);
3411 if (rc)
3412 return rc;
3413 len = 0;
3414 for (c = genfs->head; c; c = c->next)
3415 len++;
3416 buf[0] = cpu_to_le32(len);
3417 rc = put_entry(buf, sizeof(u32), 1, fp);
3418 if (rc)
3419 return rc;
3420 for (c = genfs->head; c; c = c->next) {
3421 len = strlen(c->u.name);
3422 buf[0] = cpu_to_le32(len);
3423 rc = put_entry(buf, sizeof(u32), 1, fp);
3424 if (rc)
3425 return rc;
3426 rc = put_entry(c->u.name, 1, len, fp);
3427 if (rc)
3428 return rc;
3429 buf[0] = cpu_to_le32(c->v.sclass);
3430 rc = put_entry(buf, sizeof(u32), 1, fp);
3431 if (rc)
3432 return rc;
3433 rc = context_write(p, &c->context[0], fp);
3434 if (rc)
3435 return rc;
3436 }
3437 }
3438 return 0;
3439}
3440
3441static int range_write_helper(void *key, void *data, void *ptr)
3442{
3443 __le32 buf[2];
3444 struct range_trans *rt = key;
3445 struct mls_range *r = data;
3446 struct policy_data *pd = ptr;
3447 void *fp = pd->fp;
3448 struct policydb *p = pd->p;
3449 int rc;
3450
3451 buf[0] = cpu_to_le32(rt->source_type);
3452 buf[1] = cpu_to_le32(rt->target_type);
3453 rc = put_entry(buf, sizeof(u32), 2, fp);
3454 if (rc)
3455 return rc;
3456 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
3457 buf[0] = cpu_to_le32(rt->target_class);
3458 rc = put_entry(buf, sizeof(u32), 1, fp);
3459 if (rc)
3460 return rc;
3461 }
3462 rc = mls_write_range_helper(r, fp);
3463 if (rc)
3464 return rc;
3465
3466 return 0;
3467}
3468
3469static int range_write(struct policydb *p, void *fp)
3470{
3471 __le32 buf[1];
3472 int rc;
3473 struct policy_data pd;
3474
3475 pd.p = p;
3476 pd.fp = fp;
3477
3478 buf[0] = cpu_to_le32(p->range_tr.nel);
3479 rc = put_entry(buf, sizeof(u32), 1, fp);
3480 if (rc)
3481 return rc;
3482
3483
3484 rc = hashtab_map(&p->range_tr, range_write_helper, &pd);
3485 if (rc)
3486 return rc;
3487
3488 return 0;
3489}
3490
3491static int filename_write_helper_compat(void *key, void *data, void *ptr)
3492{
3493 struct filename_trans_key *ft = key;
3494 struct filename_trans_datum *datum = data;
3495 struct ebitmap_node *node;
3496 void *fp = ptr;
3497 __le32 buf[4];
3498 int rc;
3499 u32 bit, len = strlen(ft->name);
3500
3501 do {
3502 ebitmap_for_each_positive_bit(&datum->stypes, node, bit) {
3503 buf[0] = cpu_to_le32(len);
3504 rc = put_entry(buf, sizeof(u32), 1, fp);
3505 if (rc)
3506 return rc;
3507
3508 rc = put_entry(ft->name, sizeof(char), len, fp);
3509 if (rc)
3510 return rc;
3511
3512 buf[0] = cpu_to_le32(bit + 1);
3513 buf[1] = cpu_to_le32(ft->ttype);
3514 buf[2] = cpu_to_le32(ft->tclass);
3515 buf[3] = cpu_to_le32(datum->otype);
3516
3517 rc = put_entry(buf, sizeof(u32), 4, fp);
3518 if (rc)
3519 return rc;
3520 }
3521
3522 datum = datum->next;
3523 } while (unlikely(datum));
3524
3525 return 0;
3526}
3527
3528static int filename_write_helper(void *key, void *data, void *ptr)
3529{
3530 struct filename_trans_key *ft = key;
3531 struct filename_trans_datum *datum;
3532 void *fp = ptr;
3533 __le32 buf[3];
3534 int rc;
3535 u32 ndatum, len = strlen(ft->name);
3536
3537 buf[0] = cpu_to_le32(len);
3538 rc = put_entry(buf, sizeof(u32), 1, fp);
3539 if (rc)
3540 return rc;
3541
3542 rc = put_entry(ft->name, sizeof(char), len, fp);
3543 if (rc)
3544 return rc;
3545
3546 ndatum = 0;
3547 datum = data;
3548 do {
3549 ndatum++;
3550 datum = datum->next;
3551 } while (unlikely(datum));
3552
3553 buf[0] = cpu_to_le32(ft->ttype);
3554 buf[1] = cpu_to_le32(ft->tclass);
3555 buf[2] = cpu_to_le32(ndatum);
3556 rc = put_entry(buf, sizeof(u32), 3, fp);
3557 if (rc)
3558 return rc;
3559
3560 datum = data;
3561 do {
3562 rc = ebitmap_write(&datum->stypes, fp);
3563 if (rc)
3564 return rc;
3565
3566 buf[0] = cpu_to_le32(datum->otype);
3567 rc = put_entry(buf, sizeof(u32), 1, fp);
3568 if (rc)
3569 return rc;
3570
3571 datum = datum->next;
3572 } while (unlikely(datum));
3573
3574 return 0;
3575}
3576
3577static int filename_trans_write(struct policydb *p, void *fp)
3578{
3579 __le32 buf[1];
3580 int rc;
3581
3582 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
3583 return 0;
3584
3585 if (p->policyvers < POLICYDB_VERSION_COMP_FTRANS) {
3586 buf[0] = cpu_to_le32(p->compat_filename_trans_count);
3587 rc = put_entry(buf, sizeof(u32), 1, fp);
3588 if (rc)
3589 return rc;
3590
3591 rc = hashtab_map(&p->filename_trans,
3592 filename_write_helper_compat, fp);
3593 } else {
3594 buf[0] = cpu_to_le32(p->filename_trans.nel);
3595 rc = put_entry(buf, sizeof(u32), 1, fp);
3596 if (rc)
3597 return rc;
3598
3599 rc = hashtab_map(&p->filename_trans, filename_write_helper, fp);
3600 }
3601 return rc;
3602}
3603
3604
3605
3606
3607
3608
3609int policydb_write(struct policydb *p, void *fp)
3610{
3611 unsigned int i, num_syms;
3612 int rc;
3613 __le32 buf[4];
3614 u32 config;
3615 size_t len;
3616 struct policydb_compat_info *info;
3617
3618
3619
3620
3621
3622
3623
3624 if (p->policyvers < POLICYDB_VERSION_AVTAB) {
3625 pr_err("SELinux: refusing to write policy version %d."
3626 " Because it is less than version %d\n", p->policyvers,
3627 POLICYDB_VERSION_AVTAB);
3628 return -EINVAL;
3629 }
3630
3631 config = 0;
3632 if (p->mls_enabled)
3633 config |= POLICYDB_CONFIG_MLS;
3634
3635 if (p->reject_unknown)
3636 config |= REJECT_UNKNOWN;
3637 if (p->allow_unknown)
3638 config |= ALLOW_UNKNOWN;
3639
3640
3641 buf[0] = cpu_to_le32(POLICYDB_MAGIC);
3642 len = strlen(POLICYDB_STRING);
3643 buf[1] = cpu_to_le32(len);
3644 rc = put_entry(buf, sizeof(u32), 2, fp);
3645 if (rc)
3646 return rc;
3647 rc = put_entry(POLICYDB_STRING, 1, len, fp);
3648 if (rc)
3649 return rc;
3650
3651
3652 info = policydb_lookup_compat(p->policyvers);
3653 if (!info) {
3654 pr_err("SELinux: compatibility lookup failed for policy "
3655 "version %d", p->policyvers);
3656 return -EINVAL;
3657 }
3658
3659 buf[0] = cpu_to_le32(p->policyvers);
3660 buf[1] = cpu_to_le32(config);
3661 buf[2] = cpu_to_le32(info->sym_num);
3662 buf[3] = cpu_to_le32(info->ocon_num);
3663
3664 rc = put_entry(buf, sizeof(u32), 4, fp);
3665 if (rc)
3666 return rc;
3667
3668 if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
3669 rc = ebitmap_write(&p->policycaps, fp);
3670 if (rc)
3671 return rc;
3672 }
3673
3674 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
3675 rc = ebitmap_write(&p->permissive_map, fp);
3676 if (rc)
3677 return rc;
3678 }
3679
3680 num_syms = info->sym_num;
3681 for (i = 0; i < num_syms; i++) {
3682 struct policy_data pd;
3683
3684 pd.fp = fp;
3685 pd.p = p;
3686
3687 buf[0] = cpu_to_le32(p->symtab[i].nprim);
3688 buf[1] = cpu_to_le32(p->symtab[i].table.nel);
3689
3690 rc = put_entry(buf, sizeof(u32), 2, fp);
3691 if (rc)
3692 return rc;
3693 rc = hashtab_map(&p->symtab[i].table, write_f[i], &pd);
3694 if (rc)
3695 return rc;
3696 }
3697
3698 rc = avtab_write(p, &p->te_avtab, fp);
3699 if (rc)
3700 return rc;
3701
3702 rc = cond_write_list(p, fp);
3703 if (rc)
3704 return rc;
3705
3706 rc = role_trans_write(p, fp);
3707 if (rc)
3708 return rc;
3709
3710 rc = role_allow_write(p->role_allow, fp);
3711 if (rc)
3712 return rc;
3713
3714 rc = filename_trans_write(p, fp);
3715 if (rc)
3716 return rc;
3717
3718 rc = ocontext_write(p, info, fp);
3719 if (rc)
3720 return rc;
3721
3722 rc = genfs_write(p, fp);
3723 if (rc)
3724 return rc;
3725
3726 rc = range_write(p, fp);
3727 if (rc)
3728 return rc;
3729
3730 for (i = 0; i < p->p_types.nprim; i++) {
3731 struct ebitmap *e = &p->type_attr_map_array[i];
3732
3733 rc = ebitmap_write(e, fp);
3734 if (rc)
3735 return rc;
3736 }
3737
3738 return 0;
3739}
3740