security/selinux/ss/policydb.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Implementation of the policy database.
   4  *
   5  * Author : Stephen Smalley, <stephen.smalley.work@gmail.com>
   6  */
   7
   8 /*
   9  * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
  10  *
  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 #ifdef CONFIG_SECURITY_SELINUX_DEBUG
  45 static const char *const symtab_name[SYM_NUM] = {
  46         "common prefixes",
  47         "classes",
  48         "roles",
  49         "types",
  50         "users",
  51         "bools",
  52         "levels",
  53         "categories",
  54 };
  55 #endif
  56
  57 struct policydb_compat_info {
  58         unsigned int version;
  59         unsigned int sym_num;
  60         unsigned int ocon_num;
  61 };
  62
  63 /* These need to be updated if SYM_NUM or OCON_NUM changes */
  64 static const struct policydb_compat_info policydb_compat[] = {
  65         {
  66                 .version        = POLICYDB_VERSION_BASE,
  67                 .sym_num        = SYM_NUM - 3,
  68                 .ocon_num       = OCON_NUM - 3,
  69         },
  70         {
  71                 .version        = POLICYDB_VERSION_BOOL,
  72                 .sym_num        = SYM_NUM - 2,
  73                 .ocon_num       = OCON_NUM - 3,
  74         },
  75         {
  76                 .version        = POLICYDB_VERSION_IPV6,
  77                 .sym_num        = SYM_NUM - 2,
  78                 .ocon_num       = OCON_NUM - 2,
  79         },
  80         {
  81                 .version        = POLICYDB_VERSION_NLCLASS,
  82                 .sym_num        = SYM_NUM - 2,
  83                 .ocon_num       = OCON_NUM - 2,
  84         },
  85         {
  86                 .version        = POLICYDB_VERSION_MLS,
  87                 .sym_num        = SYM_NUM,
  88                 .ocon_num       = OCON_NUM - 2,
  89         },
  90         {
  91                 .version        = POLICYDB_VERSION_AVTAB,
  92                 .sym_num        = SYM_NUM,
  93                 .ocon_num       = OCON_NUM - 2,
  94         },
  95         {
  96                 .version        = POLICYDB_VERSION_RANGETRANS,
  97                 .sym_num        = SYM_NUM,
  98                 .ocon_num       = OCON_NUM - 2,
  99         },
 100         {
 101                 .version        = POLICYDB_VERSION_POLCAP,
 102                 .sym_num        = SYM_NUM,
 103                 .ocon_num       = OCON_NUM - 2,
 104         },
 105         {
 106                 .version        = POLICYDB_VERSION_PERMISSIVE,
 107                 .sym_num        = SYM_NUM,
 108                 .ocon_num       = OCON_NUM - 2,
 109         },
 110         {
 111                 .version        = POLICYDB_VERSION_BOUNDARY,
 112                 .sym_num        = SYM_NUM,
 113                 .ocon_num       = OCON_NUM - 2,
 114         },
 115         {
 116                 .version        = POLICYDB_VERSION_FILENAME_TRANS,
 117                 .sym_num        = SYM_NUM,
 118                 .ocon_num       = OCON_NUM - 2,
 119         },
 120         {
 121                 .version        = POLICYDB_VERSION_ROLETRANS,
 122                 .sym_num        = SYM_NUM,
 123                 .ocon_num       = OCON_NUM - 2,
 124         },
 125         {
 126                 .version        = POLICYDB_VERSION_NEW_OBJECT_DEFAULTS,
 127                 .sym_num        = SYM_NUM,
 128                 .ocon_num       = OCON_NUM - 2,
 129         },
 130         {
 131                 .version        = POLICYDB_VERSION_DEFAULT_TYPE,
 132                 .sym_num        = SYM_NUM,
 133                 .ocon_num       = OCON_NUM - 2,
 134         },
 135         {
 136                 .version        = POLICYDB_VERSION_CONSTRAINT_NAMES,
 137                 .sym_num        = SYM_NUM,
 138                 .ocon_num       = OCON_NUM - 2,
 139         },
 140         {
 141                 .version        = POLICYDB_VERSION_XPERMS_IOCTL,
 142                 .sym_num        = SYM_NUM,
 143                 .ocon_num       = OCON_NUM - 2,
 144         },
 145         {
 146                 .version        = POLICYDB_VERSION_INFINIBAND,
 147                 .sym_num        = SYM_NUM,
 148                 .ocon_num       = OCON_NUM,
 149         },
 150         {
 151                 .version        = POLICYDB_VERSION_GLBLUB,
 152                 .sym_num        = SYM_NUM,
 153                 .ocon_num       = OCON_NUM,
 154         },
 155         {
 156                 .version        = POLICYDB_VERSION_COMP_FTRANS,
 157                 .sym_num        = SYM_NUM,
 158                 .ocon_num       = OCON_NUM,
 159         },
 160 };
 161
 162 static const struct policydb_compat_info *policydb_lookup_compat(unsigned int version)
 163 {
 164         unsigned int i;
 165
 166         for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) {
 167                 if (policydb_compat[i].version == version)
 168                         return &policydb_compat[i];
 169         }
 170
 171         return NULL;
 172 }
 173
 174 /*
 175  * The following *_destroy functions are used to
 176  * free any memory allocated for each kind of
 177  * symbol data in the policy database.
 178  */
 179
 180 static int perm_destroy(void *key, void *datum, void *p)
 181 {
 182         kfree(key);
 183         kfree(datum);
 184         return 0;
 185 }
 186
 187 static int common_destroy(void *key, void *datum, void *p)
 188 {
 189         struct common_datum *comdatum;
 190
 191         kfree(key);
 192         if (datum) {
 193                 comdatum = datum;
 194                 hashtab_map(&comdatum->permissions.table, perm_destroy, NULL);
 195                 hashtab_destroy(&comdatum->permissions.table);
 196         }
 197         kfree(datum);
 198         return 0;
 199 }
 200
 201 static void constraint_expr_destroy(struct constraint_expr *expr)
 202 {
 203         if (expr) {
 204                 ebitmap_destroy(&expr->names);
 205                 if (expr->type_names) {
 206                         ebitmap_destroy(&expr->type_names->types);
 207                         ebitmap_destroy(&expr->type_names->negset);
 208                         kfree(expr->type_names);
 209                 }
 210                 kfree(expr);
 211         }
 212 }
 213
 214 static int cls_destroy(void *key, void *datum, void *p)
 215 {
 216         struct class_datum *cladatum;
 217         struct constraint_node *constraint, *ctemp;
 218         struct constraint_expr *e, *etmp;
 219
 220         kfree(key);
 221         if (datum) {
 222                 cladatum = datum;
 223                 hashtab_map(&cladatum->permissions.table, perm_destroy, NULL);
 224                 hashtab_destroy(&cladatum->permissions.table);
 225                 constraint = cladatum->constraints;
 226                 while (constraint) {
 227                         e = constraint->expr;
 228                         while (e) {
 229                                 etmp = e;
 230                                 e = e->next;
 231                                 constraint_expr_destroy(etmp);
 232                         }
 233                         ctemp = constraint;
 234                         constraint = constraint->next;
 235                         kfree(ctemp);
 236                 }
 237
 238                 constraint = cladatum->validatetrans;
 239                 while (constraint) {
 240                         e = constraint->expr;
 241                         while (e) {
 242                                 etmp = e;
 243                                 e = e->next;
 244                                 constraint_expr_destroy(etmp);
 245                         }
 246                         ctemp = constraint;
 247                         constraint = constraint->next;
 248                         kfree(ctemp);
 249                 }
 250                 kfree(cladatum->comkey);
 251         }
 252         kfree(datum);
 253         return 0;
 254 }
 255
 256 static int role_destroy(void *key, void *datum, void *p)
 257 {
 258         struct role_datum *role;
 259
 260         kfree(key);
 261         if (datum) {
 262                 role = datum;
 263                 ebitmap_destroy(&role->dominates);
 264                 ebitmap_destroy(&role->types);
 265         }
 266         kfree(datum);
 267         return 0;
 268 }
 269
 270 static int type_destroy(void *key, void *datum, void *p)
 271 {
 272         kfree(key);
 273         kfree(datum);
 274         return 0;
 275 }
 276
 277 static int user_destroy(void *key, void *datum, void *p)
 278 {
 279         struct user_datum *usrdatum;
 280
 281         kfree(key);
 282         if (datum) {
 283                 usrdatum = datum;
 284                 ebitmap_destroy(&usrdatum->roles);
 285                 ebitmap_destroy(&usrdatum->range.level[0].cat);
 286                 ebitmap_destroy(&usrdatum->range.level[1].cat);
 287                 ebitmap_destroy(&usrdatum->dfltlevel.cat);
 288         }
 289         kfree(datum);
 290         return 0;
 291 }
 292
 293 static int sens_destroy(void *key, void *datum, void *p)
 294 {
 295         struct level_datum *levdatum;
 296
 297         kfree(key);
 298         if (datum) {
 299                 levdatum = datum;
 300                 if (levdatum->level)
 301                         ebitmap_destroy(&levdatum->level->cat);
 302                 kfree(levdatum->level);
 303         }
 304         kfree(datum);
 305         return 0;
 306 }
 307
 308 static int cat_destroy(void *key, void *datum, void *p)
 309 {
 310         kfree(key);
 311         kfree(datum);
 312         return 0;
 313 }
 314
 315 static int (*const destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) = {
 316         common_destroy,
 317         cls_destroy,
 318         role_destroy,
 319         type_destroy,
 320         user_destroy,
 321         cond_destroy_bool,
 322         sens_destroy,
 323         cat_destroy,
 324 };
 325
 326 static int filenametr_destroy(void *key, void *datum, void *p)
 327 {
 328         struct filename_trans_key *ft = key;
 329         struct filename_trans_datum *next, *d = datum;
 330
 331         kfree(ft->name);
 332         kfree(key);
 333         do {
 334                 ebitmap_destroy(&d->stypes);
 335                 next = d->next;
 336                 kfree(d);
 337                 d = next;
 338         } while (unlikely(d));
 339         cond_resched();
 340         return 0;
 341 }
 342
 343 static int range_tr_destroy(void *key, void *datum, void *p)
 344 {
 345         struct mls_range *rt = datum;
 346
 347         kfree(key);
 348         ebitmap_destroy(&rt->level[0].cat);
 349         ebitmap_destroy(&rt->level[1].cat);
 350         kfree(datum);
 351         cond_resched();
 352         return 0;
 353 }
 354
 355 static int role_tr_destroy(void *key, void *datum, void *p)
 356 {
 357         kfree(key);
 358         kfree(datum);
 359         return 0;
 360 }
 361
 362 static void ocontext_destroy(struct ocontext *c, unsigned int i)
 363 {
 364         if (!c)
 365                 return;
 366
 367         context_destroy(&c->context[0]);
 368         context_destroy(&c->context[1]);
 369         if (i == OCON_ISID || i == OCON_FS ||
 370             i == OCON_NETIF || i == OCON_FSUSE)
 371                 kfree(c->u.name);
 372         kfree(c);
 373 }
 374
 375 /*
 376  * Initialize the role table.
 377  */
 378 static int roles_init(struct policydb *p)
 379 {
 380         char *key = NULL;
 381         int rc;
 382         struct role_datum *role;
 383
 384         role = kzalloc(sizeof(*role), GFP_KERNEL);
 385         if (!role)
 386                 return -ENOMEM;
 387
 388         rc = -EINVAL;
 389         role->value = ++p->p_roles.nprim;
 390         if (role->value != OBJECT_R_VAL)
 391                 goto out;
 392
 393         rc = -ENOMEM;
 394         key = kstrdup(OBJECT_R, GFP_KERNEL);
 395         if (!key)
 396                 goto out;
 397
 398         rc = symtab_insert(&p->p_roles, key, role);
 399         if (rc)
 400                 goto out;
 401
 402         return 0;
 403 out:
 404         kfree(key);
 405         kfree(role);
 406         return rc;
 407 }
 408
 409 static u32 filenametr_hash(const void *k)
 410 {
 411         const struct filename_trans_key *ft = k;
 412         unsigned long salt = ft->ttype ^ ft->tclass;
 413
 414         return full_name_hash((void *)salt, ft->name, strlen(ft->name));
 415 }
 416
 417 static int filenametr_cmp(const void *k1, const void *k2)
 418 {
 419         const struct filename_trans_key *ft1 = k1;
 420         const struct filename_trans_key *ft2 = k2;
 421         int v;
 422
 423         v = ft1->ttype - ft2->ttype;
 424         if (v)
 425                 return v;
 426
 427         v = ft1->tclass - ft2->tclass;
 428         if (v)
 429                 return v;
 430
 431         return strcmp(ft1->name, ft2->name);
 432
 433 }
 434
 435 static const struct hashtab_key_params filenametr_key_params = {
 436         .hash = filenametr_hash,
 437         .cmp = filenametr_cmp,
 438 };
 439
 440 struct filename_trans_datum *policydb_filenametr_search(
 441         struct policydb *p, struct filename_trans_key *key)
 442 {
 443         return hashtab_search(&p->filename_trans, key, filenametr_key_params);
 444 }
 445
 446 static u32 rangetr_hash(const void *k)
 447 {
 448         const struct range_trans *key = k;
 449
 450         return key->source_type + (key->target_type << 3) +
 451                 (key->target_class << 5);
 452 }
 453
 454 static int rangetr_cmp(const void *k1, const void *k2)
 455 {
 456         const struct range_trans *key1 = k1, *key2 = k2;
 457         int v;
 458
 459         v = key1->source_type - key2->source_type;
 460         if (v)
 461                 return v;
 462
 463         v = key1->target_type - key2->target_type;
 464         if (v)
 465                 return v;
 466
 467         v = key1->target_class - key2->target_class;
 468
 469         return v;
 470 }
 471
 472 static const struct hashtab_key_params rangetr_key_params = {
 473         .hash = rangetr_hash,
 474         .cmp = rangetr_cmp,
 475 };
 476
 477 struct mls_range *policydb_rangetr_search(struct policydb *p,
 478                                           struct range_trans *key)
 479 {
 480         return hashtab_search(&p->range_tr, key, rangetr_key_params);
 481 }
 482
 483 static u32 role_trans_hash(const void *k)
 484 {
 485         const struct role_trans_key *key = k;
 486
 487         return jhash_3words(key->role, key->type, (u32)key->tclass << 16 | key->tclass, 0);
 488 }
 489
 490 static int role_trans_cmp(const void *k1, const void *k2)
 491 {
 492         const struct role_trans_key *key1 = k1, *key2 = k2;
 493         int v;
 494
 495         v = key1->role - key2->role;
 496         if (v)
 497                 return v;
 498
 499         v = key1->type - key2->type;
 500         if (v)
 501                 return v;
 502
 503         return key1->tclass - key2->tclass;
 504 }
 505
 506 static const struct hashtab_key_params roletr_key_params = {
 507         .hash = role_trans_hash,
 508         .cmp = role_trans_cmp,
 509 };
 510
 511 struct role_trans_datum *policydb_roletr_search(struct policydb *p,
 512                                                 struct role_trans_key *key)
 513 {
 514         return hashtab_search(&p->role_tr, key, roletr_key_params);
 515 }
 516
 517 /*
 518  * Initialize a policy database structure.
 519  */
 520 static void policydb_init(struct policydb *p)
 521 {
 522         memset(p, 0, sizeof(*p));
 523
 524         avtab_init(&p->te_avtab);
 525         cond_policydb_init(p);
 526
 527         ebitmap_init(&p->filename_trans_ttypes);
 528         ebitmap_init(&p->policycaps);
 529         ebitmap_init(&p->permissive_map);
 530 }
 531
 532 /*
 533  * The following *_index functions are used to
 534  * define the val_to_name and val_to_struct arrays
 535  * in a policy database structure.  The val_to_name
 536  * arrays are used when converting security context
 537  * structures into string representations.  The
 538  * val_to_struct arrays are used when the attributes
 539  * of a class, role, or user are needed.
 540  */
 541
 542 static int common_index(void *key, void *datum, void *datap)
 543 {
 544         struct policydb *p;
 545         struct common_datum *comdatum;
 546
 547         comdatum = datum;
 548         p = datap;
 549         if (!comdatum->value || comdatum->value > p->p_commons.nprim)
 550                 return -EINVAL;
 551
 552         p->sym_val_to_name[SYM_COMMONS][comdatum->value - 1] = key;
 553
 554         return 0;
 555 }
 556
 557 static int class_index(void *key, void *datum, void *datap)
 558 {
 559         struct policydb *p;
 560         struct class_datum *cladatum;
 561
 562         cladatum = datum;
 563         p = datap;
 564         if (!cladatum->value || cladatum->value > p->p_classes.nprim)
 565                 return -EINVAL;
 566
 567         p->sym_val_to_name[SYM_CLASSES][cladatum->value - 1] = key;
 568         p->class_val_to_struct[cladatum->value - 1] = cladatum;
 569         return 0;
 570 }
 571
 572 static int role_index(void *key, void *datum, void *datap)
 573 {
 574         struct policydb *p;
 575         struct role_datum *role;
 576
 577         role = datum;
 578         p = datap;
 579         if (!role->value
 580             || role->value > p->p_roles.nprim
 581             || role->bounds > p->p_roles.nprim)
 582                 return -EINVAL;
 583
 584         p->sym_val_to_name[SYM_ROLES][role->value - 1] = key;
 585         p->role_val_to_struct[role->value - 1] = role;
 586         return 0;
 587 }
 588
 589 static int type_index(void *key, void *datum, void *datap)
 590 {
 591         struct policydb *p;
 592         struct type_datum *typdatum;
 593
 594         typdatum = datum;
 595         p = datap;
 596
 597         if (typdatum->primary) {
 598                 if (!typdatum->value
 599                     || typdatum->value > p->p_types.nprim
 600                     || typdatum->bounds > p->p_types.nprim)
 601                         return -EINVAL;
 602                 p->sym_val_to_name[SYM_TYPES][typdatum->value - 1] = key;
 603                 p->type_val_to_struct[typdatum->value - 1] = typdatum;
 604         }
 605
 606         return 0;
 607 }
 608
 609 static int user_index(void *key, void *datum, void *datap)
 610 {
 611         struct policydb *p;
 612         struct user_datum *usrdatum;
 613
 614         usrdatum = datum;
 615         p = datap;
 616         if (!usrdatum->value
 617             || usrdatum->value > p->p_users.nprim
 618             || usrdatum->bounds > p->p_users.nprim)
 619                 return -EINVAL;
 620
 621         p->sym_val_to_name[SYM_USERS][usrdatum->value - 1] = key;
 622         p->user_val_to_struct[usrdatum->value - 1] = usrdatum;
 623         return 0;
 624 }
 625
 626 static int sens_index(void *key, void *datum, void *datap)
 627 {
 628         struct policydb *p;
 629         struct level_datum *levdatum;
 630
 631         levdatum = datum;
 632         p = datap;
 633
 634         if (!levdatum->isalias) {
 635                 if (!levdatum->level->sens ||
 636                     levdatum->level->sens > p->p_levels.nprim)
 637                         return -EINVAL;
 638
 639                 p->sym_val_to_name[SYM_LEVELS][levdatum->level->sens - 1] = key;
 640         }
 641
 642         return 0;
 643 }
 644
 645 static int cat_index(void *key, void *datum, void *datap)
 646 {
 647         struct policydb *p;
 648         struct cat_datum *catdatum;
 649
 650         catdatum = datum;
 651         p = datap;
 652
 653         if (!catdatum->isalias) {
 654                 if (!catdatum->value || catdatum->value > p->p_cats.nprim)
 655                         return -EINVAL;
 656
 657                 p->sym_val_to_name[SYM_CATS][catdatum->value - 1] = key;
 658         }
 659
 660         return 0;
 661 }
 662
 663 static int (*const index_f[SYM_NUM]) (void *key, void *datum, void *datap) = {
 664         common_index,
 665         class_index,
 666         role_index,
 667         type_index,
 668         user_index,
 669         cond_index_bool,
 670         sens_index,
 671         cat_index,
 672 };
 673
 674 #ifdef CONFIG_SECURITY_SELINUX_DEBUG
 675 static void hash_eval(struct hashtab *h, const char *hash_name)
 676 {
 677         struct hashtab_info info;
 678
 679         hashtab_stat(h, &info);
 680         pr_debug("SELinux: %s:  %d entries and %d/%d buckets used, longest chain length %d, sum of chain length^2 %llu\n",
 681                  hash_name, h->nel, info.slots_used, h->size,
 682                  info.max_chain_len, info.chain2_len_sum);
 683 }
 684
 685 static void symtab_hash_eval(struct symtab *s)
 686 {
 687         int i;
 688
 689         for (i = 0; i < SYM_NUM; i++)
 690                 hash_eval(&s[i].table, symtab_name[i]);
 691 }
 692
 693 #else
 694 static inline void hash_eval(struct hashtab *h, const char *hash_name)
 695 {
 696 }
 697 static inline void symtab_hash_eval(struct symtab *s)
 698 {
 699 }
 700 #endif /* CONFIG_SECURITY_SELINUX_DEBUG */
 701
 702 /*
 703  * Define the other val_to_name and val_to_struct arrays
 704  * in a policy database structure.
 705  *
 706  * Caller must clean up on failure.
 707  */
 708 static int policydb_index(struct policydb *p)
 709 {
 710         int i, rc;
 711
 712         if (p->mls_enabled)
 713                 pr_debug("SELinux:  %d users, %d roles, %d types, %d bools, %d sens, %d cats\n",
 714                          p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim,
 715                          p->p_bools.nprim, p->p_levels.nprim, p->p_cats.nprim);
 716         else
 717                 pr_debug("SELinux:  %d users, %d roles, %d types, %d bools\n",
 718                          p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim,
 719                          p->p_bools.nprim);
 720
 721         pr_debug("SELinux:  %d classes, %d rules\n",
 722                  p->p_classes.nprim, p->te_avtab.nel);
 723
 724         avtab_hash_eval(&p->te_avtab, "rules");
 725         symtab_hash_eval(p->symtab);
 726
 727         p->class_val_to_struct = kcalloc(p->p_classes.nprim,
 728                                          sizeof(*p->class_val_to_struct),
 729                                          GFP_KERNEL);
 730         if (!p->class_val_to_struct)
 731                 return -ENOMEM;
 732
 733         p->role_val_to_struct = kcalloc(p->p_roles.nprim,
 734                                         sizeof(*p->role_val_to_struct),
 735                                         GFP_KERNEL);
 736         if (!p->role_val_to_struct)
 737                 return -ENOMEM;
 738
 739         p->user_val_to_struct = kcalloc(p->p_users.nprim,
 740                                         sizeof(*p->user_val_to_struct),
 741                                         GFP_KERNEL);
 742         if (!p->user_val_to_struct)
 743                 return -ENOMEM;
 744
 745         p->type_val_to_struct = kvcalloc(p->p_types.nprim,
 746                                          sizeof(*p->type_val_to_struct),
 747                                          GFP_KERNEL);
 748         if (!p->type_val_to_struct)
 749                 return -ENOMEM;
 750
 751         rc = cond_init_bool_indexes(p);
 752         if (rc)
 753                 goto out;
 754
 755         for (i = 0; i < SYM_NUM; i++) {
 756                 p->sym_val_to_name[i] = kvcalloc(p->symtab[i].nprim,
 757                                                  sizeof(char *),
 758                                                  GFP_KERNEL);
 759                 if (!p->sym_val_to_name[i])
 760                         return -ENOMEM;
 761
 762                 rc = hashtab_map(&p->symtab[i].table, index_f[i], p);
 763                 if (rc)
 764                         goto out;
 765         }
 766         rc = 0;
 767 out:
 768         return rc;
 769 }
 770
 771 /*
 772  * Free any memory allocated by a policy database structure.
 773  */
 774 void policydb_destroy(struct policydb *p)
 775 {
 776         struct ocontext *c, *ctmp;
 777         struct genfs *g, *gtmp;
 778         u32 i;
 779         struct role_allow *ra, *lra = NULL;
 780
 781         for (i = 0; i < SYM_NUM; i++) {
 782                 cond_resched();
 783                 hashtab_map(&p->symtab[i].table, destroy_f[i], NULL);
 784                 hashtab_destroy(&p->symtab[i].table);
 785         }
 786
 787         for (i = 0; i < SYM_NUM; i++)
 788                 kvfree(p->sym_val_to_name[i]);
 789
 790         kfree(p->class_val_to_struct);
 791         kfree(p->role_val_to_struct);
 792         kfree(p->user_val_to_struct);
 793         kvfree(p->type_val_to_struct);
 794
 795         avtab_destroy(&p->te_avtab);
 796
 797         for (i = 0; i < OCON_NUM; i++) {
 798                 cond_resched();
 799                 c = p->ocontexts[i];
 800                 while (c) {
 801                         ctmp = c;
 802                         c = c->next;
 803                         ocontext_destroy(ctmp, i);
 804                 }
 805                 p->ocontexts[i] = NULL;
 806         }
 807
 808         g = p->genfs;
 809         while (g) {
 810                 cond_resched();
 811                 kfree(g->fstype);
 812                 c = g->head;
 813                 while (c) {
 814                         ctmp = c;
 815                         c = c->next;
 816                         ocontext_destroy(ctmp, OCON_FSUSE);
 817                 }
 818                 gtmp = g;
 819                 g = g->next;
 820                 kfree(gtmp);
 821         }
 822         p->genfs = NULL;
 823
 824         cond_policydb_destroy(p);
 825
 826         hashtab_map(&p->role_tr, role_tr_destroy, NULL);
 827         hashtab_destroy(&p->role_tr);
 828
 829         for (ra = p->role_allow; ra; ra = ra->next) {
 830                 cond_resched();
 831                 kfree(lra);
 832                 lra = ra;
 833         }
 834         kfree(lra);
 835
 836         hashtab_map(&p->filename_trans, filenametr_destroy, NULL);
 837         hashtab_destroy(&p->filename_trans);
 838
 839         hashtab_map(&p->range_tr, range_tr_destroy, NULL);
 840         hashtab_destroy(&p->range_tr);
 841
 842         if (p->type_attr_map_array) {
 843                 for (i = 0; i < p->p_types.nprim; i++)
 844                         ebitmap_destroy(&p->type_attr_map_array[i]);
 845                 kvfree(p->type_attr_map_array);
 846         }
 847
 848         ebitmap_destroy(&p->filename_trans_ttypes);
 849         ebitmap_destroy(&p->policycaps);
 850         ebitmap_destroy(&p->permissive_map);
 851 }
 852
 853 /*
 854  * Load the initial SIDs specified in a policy database
 855  * structure into a SID table.
 856  */
 857 int policydb_load_isids(struct policydb *p, struct sidtab *s)
 858 {
 859         struct ocontext *head, *c;
 860         bool isid_init_supported = ebitmap_get_bit(&p->policycaps,
 861                                                    POLICYDB_CAP_USERSPACE_INITIAL_CONTEXT);
 862         int rc;
 863
 864         rc = sidtab_init(s);
 865         if (rc) {
 866                 pr_err("SELinux:  out of memory on SID table init\n");
 867                 return rc;
 868         }
 869
 870         head = p->ocontexts[OCON_ISID];
 871         for (c = head; c; c = c->next) {
 872                 u32 sid = c->sid[0];
 873                 const char *name = security_get_initial_sid_context(sid);
 874
 875                 if (sid == SECSID_NULL) {
 876                         pr_err("SELinux:  SID 0 was assigned a context.\n");
 877                         sidtab_destroy(s);
 878                         return -EINVAL;
 879                 }
 880
 881                 /* Ignore initial SIDs unused by this kernel. */
 882                 if (!name)
 883                         continue;
 884
 885                 /*
 886                  * Also ignore SECINITSID_INIT if the policy doesn't declare
 887                  * support for it
 888                  */
 889                 if (sid == SECINITSID_INIT && !isid_init_supported)
 890                         continue;
 891
 892                 rc = sidtab_set_initial(s, sid, &c->context[0]);
 893                 if (rc) {
 894                         pr_err("SELinux:  unable to load initial SID %s.\n",
 895                                name);
 896                         sidtab_destroy(s);
 897                         return rc;
 898                 }
 899
 900                 /*
 901                  * If the policy doesn't support the "userspace_initial_context"
 902                  * capability, set SECINITSID_INIT to the same context as
 903                  * SECINITSID_KERNEL. This ensures the same behavior as before
 904                  * the reintroduction of SECINITSID_INIT, where all tasks
 905                  * started before policy load would initially get the context
 906                  * corresponding to SECINITSID_KERNEL.
 907                  */
 908                 if (sid == SECINITSID_KERNEL && !isid_init_supported) {
 909                         rc = sidtab_set_initial(s, SECINITSID_INIT, &c->context[0]);
 910                         if (rc) {
 911                                 pr_err("SELinux:  unable to load initial SID %s.\n",
 912                                        name);
 913                                 sidtab_destroy(s);
 914                                 return rc;
 915                         }
 916                 }
 917         }
 918         return 0;
 919 }
 920
 921 int policydb_class_isvalid(struct policydb *p, unsigned int class)
 922 {
 923         if (!class || class > p->p_classes.nprim)
 924                 return 0;
 925         return 1;
 926 }
 927
 928 int policydb_role_isvalid(struct policydb *p, unsigned int role)
 929 {
 930         if (!role || role > p->p_roles.nprim)
 931                 return 0;
 932         return 1;
 933 }
 934
 935 int policydb_type_isvalid(struct policydb *p, unsigned int type)
 936 {
 937         if (!type || type > p->p_types.nprim)
 938                 return 0;
 939         return 1;
 940 }
 941
 942 /*
 943  * Return 1 if the fields in the security context
 944  * structure `c' are valid.  Return 0 otherwise.
 945  */
 946 int policydb_context_isvalid(struct policydb *p, struct context *c)
 947 {
 948         struct role_datum *role;
 949         struct user_datum *usrdatum;
 950
 951         if (!c->role || c->role > p->p_roles.nprim)
 952                 return 0;
 953
 954         if (!c->user || c->user > p->p_users.nprim)
 955                 return 0;
 956
 957         if (!c->type || c->type > p->p_types.nprim)
 958                 return 0;
 959
 960         if (c->role != OBJECT_R_VAL) {
 961                 /*
 962                  * Role must be authorized for the type.
 963                  */
 964                 role = p->role_val_to_struct[c->role - 1];
 965                 if (!role || !ebitmap_get_bit(&role->types, c->type - 1))
 966                         /* role may not be associated with type */
 967                         return 0;
 968
 969                 /*
 970                  * User must be authorized for the role.
 971                  */
 972                 usrdatum = p->user_val_to_struct[c->user - 1];
 973                 if (!usrdatum)
 974                         return 0;
 975
 976                 if (!ebitmap_get_bit(&usrdatum->roles, c->role - 1))
 977                         /* user may not be associated with role */
 978                         return 0;
 979         }
 980
 981         if (!mls_context_isvalid(p, c))
 982                 return 0;
 983
 984         return 1;
 985 }
 986
 987 /*
 988  * Read a MLS range structure from a policydb binary
 989  * representation file.
 990  */
 991 static int mls_read_range_helper(struct mls_range *r, void *fp)
 992 {
 993         __le32 buf[2];
 994         u32 items;
 995         int rc;
 996
 997         rc = next_entry(buf, fp, sizeof(u32));
 998         if (rc)
 999                 goto out;
1000
1001         rc = -EINVAL;
1002         items = le32_to_cpu(buf[0]);
1003         if (items > ARRAY_SIZE(buf)) {
1004                 pr_err("SELinux: mls:  range overflow\n");
1005                 goto out;
1006         }
1007
1008         rc = next_entry(buf, fp, sizeof(u32) * items);
1009         if (rc) {
1010                 pr_err("SELinux: mls:  truncated range\n");
1011                 goto out;
1012         }
1013
1014         r->level[0].sens = le32_to_cpu(buf[0]);
1015         if (items > 1)
1016                 r->level[1].sens = le32_to_cpu(buf[1]);
1017         else
1018                 r->level[1].sens = r->level[0].sens;
1019
1020         rc = ebitmap_read(&r->level[0].cat, fp);
1021         if (rc) {
1022                 pr_err("SELinux: mls:  error reading low categories\n");
1023                 goto out;
1024         }
1025         if (items > 1) {
1026                 rc = ebitmap_read(&r->level[1].cat, fp);
1027                 if (rc) {
1028                         pr_err("SELinux: mls:  error reading high categories\n");
1029                         goto bad_high;
1030                 }
1031         } else {
1032                 rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat);
1033                 if (rc) {
1034                         pr_err("SELinux: mls:  out of memory\n");
1035                         goto bad_high;
1036                 }
1037         }
1038
1039         return 0;
1040 bad_high:
1041         ebitmap_destroy(&r->level[0].cat);
1042 out:
1043         return rc;
1044 }
1045
1046 /*
1047  * Read and validate a security context structure
1048  * from a policydb binary representation file.
1049  */
1050 static int context_read_and_validate(struct context *c,
1051                                      struct policydb *p,
1052                                      void *fp)
1053 {
1054         __le32 buf[3];
1055         int rc;
1056
1057         rc = next_entry(buf, fp, sizeof buf);
1058         if (rc) {
1059                 pr_err("SELinux: context truncated\n");
1060                 goto out;
1061         }
1062         c->user = le32_to_cpu(buf[0]);
1063         c->role = le32_to_cpu(buf[1]);
1064         c->type = le32_to_cpu(buf[2]);
1065         if (p->policyvers >= POLICYDB_VERSION_MLS) {
1066                 rc = mls_read_range_helper(&c->range, fp);
1067                 if (rc) {
1068                         pr_err("SELinux: error reading MLS range of context\n");
1069                         goto out;
1070                 }
1071         }
1072
1073         rc = -EINVAL;
1074         if (!policydb_context_isvalid(p, c)) {
1075                 pr_err("SELinux:  invalid security context\n");
1076                 context_destroy(c);
1077                 goto out;
1078         }
1079         rc = 0;
1080 out:
1081         return rc;
1082 }
1083
1084 /*
1085  * The following *_read functions are used to
1086  * read the symbol data from a policy database
1087  * binary representation file.
1088  */
1089
1090 static int str_read(char **strp, gfp_t flags, void *fp, u32 len)
1091 {
1092         int rc;
1093         char *str;
1094
1095         if ((len == 0) || (len == (u32)-1))
1096                 return -EINVAL;
1097
1098         str = kmalloc(len + 1, flags | __GFP_NOWARN);
1099         if (!str)
1100                 return -ENOMEM;
1101
1102         rc = next_entry(str, fp, len);
1103         if (rc) {
1104                 kfree(str);
1105                 return rc;
1106         }
1107
1108         str[len] = '\0';
1109         *strp = str;
1110         return 0;
1111 }
1112
1113 static int perm_read(struct policydb *p, struct symtab *s, void *fp)
1114 {
1115         char *key = NULL;
1116         struct perm_datum *perdatum;
1117         int rc;
1118         __le32 buf[2];
1119         u32 len;
1120
1121         perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
1122         if (!perdatum)
1123                 return -ENOMEM;
1124
1125         rc = next_entry(buf, fp, sizeof buf);
1126         if (rc)
1127                 goto bad;
1128
1129         len = le32_to_cpu(buf[0]);
1130         perdatum->value = le32_to_cpu(buf[1]);
1131
1132         rc = str_read(&key, GFP_KERNEL, fp, len);
1133         if (rc)
1134                 goto bad;
1135
1136         rc = symtab_insert(s, key, perdatum);
1137         if (rc)
1138                 goto bad;
1139
1140         return 0;
1141 bad:
1142         perm_destroy(key, perdatum, NULL);
1143         return rc;
1144 }
1145
1146 static int common_read(struct policydb *p, struct symtab *s, void *fp)
1147 {
1148         char *key = NULL;
1149         struct common_datum *comdatum;
1150         __le32 buf[4];
1151         u32 i, len, nel;
1152         int rc;
1153
1154         comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
1155         if (!comdatum)
1156                 return -ENOMEM;
1157
1158         rc = next_entry(buf, fp, sizeof buf);
1159         if (rc)
1160                 goto bad;
1161
1162         len = le32_to_cpu(buf[0]);
1163         comdatum->value = le32_to_cpu(buf[1]);
1164         nel = le32_to_cpu(buf[3]);
1165
1166         rc = symtab_init(&comdatum->permissions, nel);
1167         if (rc)
1168                 goto bad;
1169         comdatum->permissions.nprim = le32_to_cpu(buf[2]);
1170
1171         rc = str_read(&key, GFP_KERNEL, fp, len);
1172         if (rc)
1173                 goto bad;
1174
1175         for (i = 0; i < nel; i++) {
1176                 rc = perm_read(p, &comdatum->permissions, fp);
1177                 if (rc)
1178                         goto bad;
1179         }
1180
1181         rc = symtab_insert(s, key, comdatum);
1182         if (rc)
1183                 goto bad;
1184         return 0;
1185 bad:
1186         common_destroy(key, comdatum, NULL);
1187         return rc;
1188 }
1189
1190 static void type_set_init(struct type_set *t)
1191 {
1192         ebitmap_init(&t->types);
1193         ebitmap_init(&t->negset);
1194 }
1195
1196 static int type_set_read(struct type_set *t, void *fp)
1197 {
1198         __le32 buf[1];
1199         int rc;
1200
1201         if (ebitmap_read(&t->types, fp))
1202                 return -EINVAL;
1203         if (ebitmap_read(&t->negset, fp))
1204                 return -EINVAL;
1205
1206         rc = next_entry(buf, fp, sizeof(u32));
1207         if (rc < 0)
1208                 return -EINVAL;
1209         t->flags = le32_to_cpu(buf[0]);
1210
1211         return 0;
1212 }
1213
1214
1215 static int read_cons_helper(struct policydb *p,
1216                                 struct constraint_node **nodep,
1217                                 u32 ncons, int allowxtarget, void *fp)
1218 {
1219         struct constraint_node *c, *lc;
1220         struct constraint_expr *e, *le;
1221         __le32 buf[3];
1222         u32 i, j, nexpr;
1223         int rc, depth;
1224
1225         lc = NULL;
1226         for (i = 0; i < ncons; i++) {
1227                 c = kzalloc(sizeof(*c), GFP_KERNEL);
1228                 if (!c)
1229                         return -ENOMEM;
1230
1231                 if (lc)
1232                         lc->next = c;
1233                 else
1234                         *nodep = c;
1235
1236                 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1237                 if (rc)
1238                         return rc;
1239                 c->permissions = le32_to_cpu(buf[0]);
1240                 nexpr = le32_to_cpu(buf[1]);
1241                 le = NULL;
1242                 depth = -1;
1243                 for (j = 0; j < nexpr; j++) {
1244                         e = kzalloc(sizeof(*e), GFP_KERNEL);
1245                         if (!e)
1246                                 return -ENOMEM;
1247
1248                         if (le)
1249                                 le->next = e;
1250                         else
1251                                 c->expr = e;
1252
1253                         rc = next_entry(buf, fp, (sizeof(u32) * 3));
1254                         if (rc)
1255                                 return rc;
1256                         e->expr_type = le32_to_cpu(buf[0]);
1257                         e->attr = le32_to_cpu(buf[1]);
1258                         e->op = le32_to_cpu(buf[2]);
1259
1260                         switch (e->expr_type) {
1261                         case CEXPR_NOT:
1262                                 if (depth < 0)
1263                                         return -EINVAL;
1264                                 break;
1265                         case CEXPR_AND:
1266                         case CEXPR_OR:
1267                                 if (depth < 1)
1268                                         return -EINVAL;
1269                                 depth--;
1270                                 break;
1271                         case CEXPR_ATTR:
1272                                 if (depth == (CEXPR_MAXDEPTH - 1))
1273                                         return -EINVAL;
1274                                 depth++;
1275                                 break;
1276                         case CEXPR_NAMES:
1277                                 if (!allowxtarget && (e->attr & CEXPR_XTARGET))
1278                                         return -EINVAL;
1279                                 if (depth == (CEXPR_MAXDEPTH - 1))
1280                                         return -EINVAL;
1281                                 depth++;
1282                                 rc = ebitmap_read(&e->names, fp);
1283                                 if (rc)
1284                                         return rc;
1285                                 if (p->policyvers >=
1286                                     POLICYDB_VERSION_CONSTRAINT_NAMES) {
1287                                         e->type_names = kzalloc(sizeof
1288                                                 (*e->type_names), GFP_KERNEL);
1289                                         if (!e->type_names)
1290                                                 return -ENOMEM;
1291                                         type_set_init(e->type_names);
1292                                         rc = type_set_read(e->type_names, fp);
1293                                         if (rc)
1294                                                 return rc;
1295                                 }
1296                                 break;
1297                         default:
1298                                 return -EINVAL;
1299                         }
1300                         le = e;
1301                 }
1302                 if (depth != 0)
1303                         return -EINVAL;
1304                 lc = c;
1305         }
1306
1307         return 0;
1308 }
1309
1310 static int class_read(struct policydb *p, struct symtab *s, void *fp)
1311 {
1312         char *key = NULL;
1313         struct class_datum *cladatum;
1314         __le32 buf[6];
1315         u32 i, len, len2, ncons, nel;
1316         int rc;
1317
1318         cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
1319         if (!cladatum)
1320                 return -ENOMEM;
1321
1322         rc = next_entry(buf, fp, sizeof(u32)*6);
1323         if (rc)
1324                 goto bad;
1325
1326         len = le32_to_cpu(buf[0]);
1327         len2 = le32_to_cpu(buf[1]);
1328         cladatum->value = le32_to_cpu(buf[2]);
1329         nel = le32_to_cpu(buf[4]);
1330
1331         rc = symtab_init(&cladatum->permissions, nel);
1332         if (rc)
1333                 goto bad;
1334         cladatum->permissions.nprim = le32_to_cpu(buf[3]);
1335
1336         ncons = le32_to_cpu(buf[5]);
1337
1338         rc = str_read(&key, GFP_KERNEL, fp, len);
1339         if (rc)
1340                 goto bad;
1341
1342         if (len2) {
1343                 rc = str_read(&cladatum->comkey, GFP_KERNEL, fp, len2);
1344                 if (rc)
1345                         goto bad;
1346
1347                 rc = -EINVAL;
1348                 cladatum->comdatum = symtab_search(&p->p_commons,
1349                                                    cladatum->comkey);
1350                 if (!cladatum->comdatum) {
1351                         pr_err("SELinux:  unknown common %s\n",
1352                                cladatum->comkey);
1353                         goto bad;
1354                 }
1355         }
1356         for (i = 0; i < nel; i++) {
1357                 rc = perm_read(p, &cladatum->permissions, fp);
1358                 if (rc)
1359                         goto bad;
1360         }
1361
1362         rc = read_cons_helper(p, &cladatum->constraints, ncons, 0, fp);
1363         if (rc)
1364                 goto bad;
1365
1366         if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
1367                 /* grab the validatetrans rules */
1368                 rc = next_entry(buf, fp, sizeof(u32));
1369                 if (rc)
1370                         goto bad;
1371                 ncons = le32_to_cpu(buf[0]);
1372                 rc = read_cons_helper(p, &cladatum->validatetrans,
1373                                 ncons, 1, fp);
1374                 if (rc)
1375                         goto bad;
1376         }
1377
1378         if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
1379                 rc = next_entry(buf, fp, sizeof(u32) * 3);
1380                 if (rc)
1381                         goto bad;
1382
1383                 cladatum->default_user = le32_to_cpu(buf[0]);
1384                 cladatum->default_role = le32_to_cpu(buf[1]);
1385                 cladatum->default_range = le32_to_cpu(buf[2]);
1386         }
1387
1388         if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
1389                 rc = next_entry(buf, fp, sizeof(u32) * 1);
1390                 if (rc)
1391                         goto bad;
1392                 cladatum->default_type = le32_to_cpu(buf[0]);
1393         }
1394
1395         rc = symtab_insert(s, key, cladatum);
1396         if (rc)
1397                 goto bad;
1398
1399         return 0;
1400 bad:
1401         cls_destroy(key, cladatum, NULL);
1402         return rc;
1403 }
1404
1405 static int role_read(struct policydb *p, struct symtab *s, void *fp)
1406 {
1407         char *key = NULL;
1408         struct role_datum *role;
1409         int rc;
1410         unsigned int to_read = 2;
1411         __le32 buf[3];
1412         u32 len;
1413
1414         role = kzalloc(sizeof(*role), GFP_KERNEL);
1415         if (!role)
1416                 return -ENOMEM;
1417
1418         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1419                 to_read = 3;
1420
1421         rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1422         if (rc)
1423                 goto bad;
1424
1425         len = le32_to_cpu(buf[0]);
1426         role->value = le32_to_cpu(buf[1]);
1427         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1428                 role->bounds = le32_to_cpu(buf[2]);
1429
1430         rc = str_read(&key, GFP_KERNEL, fp, len);
1431         if (rc)
1432                 goto bad;
1433
1434         rc = ebitmap_read(&role->dominates, fp);
1435         if (rc)
1436                 goto bad;
1437
1438         rc = ebitmap_read(&role->types, fp);
1439         if (rc)
1440                 goto bad;
1441
1442         if (strcmp(key, OBJECT_R) == 0) {
1443                 rc = -EINVAL;
1444                 if (role->value != OBJECT_R_VAL) {
1445                         pr_err("SELinux: Role %s has wrong value %d\n",
1446                                OBJECT_R, role->value);
1447                         goto bad;
1448                 }
1449                 rc = 0;
1450                 goto bad;
1451         }
1452
1453         rc = symtab_insert(s, key, role);
1454         if (rc)
1455                 goto bad;
1456         return 0;
1457 bad:
1458         role_destroy(key, role, NULL);
1459         return rc;
1460 }
1461
1462 static int type_read(struct policydb *p, struct symtab *s, void *fp)
1463 {
1464         char *key = NULL;
1465         struct type_datum *typdatum;
1466         int rc;
1467         unsigned int to_read = 3;
1468         __le32 buf[4];
1469         u32 len;
1470
1471         typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL);
1472         if (!typdatum)
1473                 return -ENOMEM;
1474
1475         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1476                 to_read = 4;
1477
1478         rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1479         if (rc)
1480                 goto bad;
1481
1482         len = le32_to_cpu(buf[0]);
1483         typdatum->value = le32_to_cpu(buf[1]);
1484         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
1485                 u32 prop = le32_to_cpu(buf[2]);
1486
1487                 if (prop & TYPEDATUM_PROPERTY_PRIMARY)
1488                         typdatum->primary = 1;
1489                 if (prop & TYPEDATUM_PROPERTY_ATTRIBUTE)
1490                         typdatum->attribute = 1;
1491
1492                 typdatum->bounds = le32_to_cpu(buf[3]);
1493         } else {
1494                 typdatum->primary = le32_to_cpu(buf[2]);
1495         }
1496
1497         rc = str_read(&key, GFP_KERNEL, fp, len);
1498         if (rc)
1499                 goto bad;
1500
1501         rc = symtab_insert(s, key, typdatum);
1502         if (rc)
1503                 goto bad;
1504         return 0;
1505 bad:
1506         type_destroy(key, typdatum, NULL);
1507         return rc;
1508 }
1509
1510
1511 /*
1512  * Read a MLS level structure from a policydb binary
1513  * representation file.
1514  */
1515 static int mls_read_level(struct mls_level *lp, void *fp)
1516 {
1517         __le32 buf[1];
1518         int rc;
1519
1520         memset(lp, 0, sizeof(*lp));
1521
1522         rc = next_entry(buf, fp, sizeof buf);
1523         if (rc) {
1524                 pr_err("SELinux: mls: truncated level\n");
1525                 return rc;
1526         }
1527         lp->sens = le32_to_cpu(buf[0]);
1528
1529         rc = ebitmap_read(&lp->cat, fp);
1530         if (rc) {
1531                 pr_err("SELinux: mls:  error reading level categories\n");
1532                 return rc;
1533         }
1534         return 0;
1535 }
1536
1537 static int user_read(struct policydb *p, struct symtab *s, void *fp)
1538 {
1539         char *key = NULL;
1540         struct user_datum *usrdatum;
1541         int rc;
1542         unsigned int 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 = symtab_insert(s, key, usrdatum);
1580         if (rc)
1581                 goto bad;
1582         return 0;
1583 bad:
1584         user_destroy(key, usrdatum, NULL);
1585         return rc;
1586 }
1587
1588 static int sens_read(struct policydb *p, struct symtab *s, 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_KERNEL);
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_KERNEL, fp, len);
1608         if (rc)
1609                 goto bad;
1610
1611         rc = -ENOMEM;
1612         levdatum->level = kmalloc(sizeof(*levdatum->level), GFP_KERNEL);
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 = symtab_insert(s, key, levdatum);
1621         if (rc)
1622                 goto bad;
1623         return 0;
1624 bad:
1625         sens_destroy(key, levdatum, NULL);
1626         return rc;
1627 }
1628
1629 static int cat_read(struct policydb *p, struct symtab *s, 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_KERNEL);
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_KERNEL, fp, len);
1650         if (rc)
1651                 goto bad;
1652
1653         rc = symtab_insert(s, key, catdatum);
1654         if (rc)
1655                 goto bad;
1656         return 0;
1657 bad:
1658         cat_destroy(key, catdatum, NULL);
1659         return rc;
1660 }
1661
1662 static int (*const read_f[SYM_NUM]) (struct policydb *p,
1663                                      struct symtab *s, void *fp) = {
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
1674 static int user_bounds_sanity_check(void *key, void *datum, void *datap)
1675 {
1676         struct user_datum *upper, *user;
1677         struct policydb *p = datap;
1678         int depth = 0;
1679
1680         upper = user = datum;
1681         while (upper->bounds) {
1682                 struct ebitmap_node *node;
1683                 u32 bit;
1684
1685                 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1686                         pr_err("SELinux: user %s: "
1687                                "too deep or looped boundary\n",
1688                                (char *) key);
1689                         return -EINVAL;
1690                 }
1691
1692                 upper = p->user_val_to_struct[upper->bounds - 1];
1693                 ebitmap_for_each_positive_bit(&user->roles, node, bit) {
1694                         if (ebitmap_get_bit(&upper->roles, bit))
1695                                 continue;
1696
1697                         pr_err("SELinux: boundary violated policy: "
1698                                "user=%s role=%s bounds=%s\n",
1699                                sym_name(p, SYM_USERS, user->value - 1),
1700                                sym_name(p, SYM_ROLES, bit),
1701                                sym_name(p, SYM_USERS, upper->value - 1));
1702
1703                         return -EINVAL;
1704                 }
1705         }
1706
1707         return 0;
1708 }
1709
1710 static int role_bounds_sanity_check(void *key, void *datum, void *datap)
1711 {
1712         struct role_datum *upper, *role;
1713         struct policydb *p = datap;
1714         int depth = 0;
1715
1716         upper = role = datum;
1717         while (upper->bounds) {
1718                 struct ebitmap_node *node;
1719                 u32 bit;
1720
1721                 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1722                         pr_err("SELinux: role %s: "
1723                                "too deep or looped bounds\n",
1724                                (char *) key);
1725                         return -EINVAL;
1726                 }
1727
1728                 upper = p->role_val_to_struct[upper->bounds - 1];
1729                 ebitmap_for_each_positive_bit(&role->types, node, bit) {
1730                         if (ebitmap_get_bit(&upper->types, bit))
1731                                 continue;
1732
1733                         pr_err("SELinux: boundary violated policy: "
1734                                "role=%s type=%s bounds=%s\n",
1735                                sym_name(p, SYM_ROLES, role->value - 1),
1736                                sym_name(p, SYM_TYPES, bit),
1737                                sym_name(p, SYM_ROLES, upper->value - 1));
1738
1739                         return -EINVAL;
1740                 }
1741         }
1742
1743         return 0;
1744 }
1745
1746 static int type_bounds_sanity_check(void *key, void *datum, void *datap)
1747 {
1748         struct type_datum *upper;
1749         struct policydb *p = datap;
1750         int depth = 0;
1751
1752         upper = datum;
1753         while (upper->bounds) {
1754                 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1755                         pr_err("SELinux: type %s: "
1756                                "too deep or looped boundary\n",
1757                                (char *) key);
1758                         return -EINVAL;
1759                 }
1760
1761                 upper = p->type_val_to_struct[upper->bounds - 1];
1762                 BUG_ON(!upper);
1763
1764                 if (upper->attribute) {
1765                         pr_err("SELinux: type %s: "
1766                                "bounded by attribute %s\n",
1767                                (char *) key,
1768                                sym_name(p, SYM_TYPES, upper->value - 1));
1769                         return -EINVAL;
1770                 }
1771         }
1772
1773         return 0;
1774 }
1775
1776 static int policydb_bounds_sanity_check(struct policydb *p)
1777 {
1778         int rc;
1779
1780         if (p->policyvers < POLICYDB_VERSION_BOUNDARY)
1781                 return 0;
1782
1783         rc = hashtab_map(&p->p_users.table, user_bounds_sanity_check, p);
1784         if (rc)
1785                 return rc;
1786
1787         rc = hashtab_map(&p->p_roles.table, role_bounds_sanity_check, p);
1788         if (rc)
1789                 return rc;
1790
1791         rc = hashtab_map(&p->p_types.table, type_bounds_sanity_check, p);
1792         if (rc)
1793                 return rc;
1794
1795         return 0;
1796 }
1797
1798 u16 string_to_security_class(struct policydb *p, const char *name)
1799 {
1800         struct class_datum *cladatum;
1801
1802         cladatum = symtab_search(&p->p_classes, name);
1803         if (!cladatum)
1804                 return 0;
1805
1806         return cladatum->value;
1807 }
1808
1809 u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name)
1810 {
1811         struct class_datum *cladatum;
1812         struct perm_datum *perdatum = NULL;
1813         struct common_datum *comdatum;
1814
1815         if (!tclass || tclass > p->p_classes.nprim)
1816                 return 0;
1817
1818         cladatum = p->class_val_to_struct[tclass-1];
1819         comdatum = cladatum->comdatum;
1820         if (comdatum)
1821                 perdatum = symtab_search(&comdatum->permissions, name);
1822         if (!perdatum)
1823                 perdatum = symtab_search(&cladatum->permissions, name);
1824         if (!perdatum)
1825                 return 0;
1826
1827         return 1U << (perdatum->value-1);
1828 }
1829
1830 static int range_read(struct policydb *p, void *fp)
1831 {
1832         struct range_trans *rt = NULL;
1833         struct mls_range *r = NULL;
1834         int rc;
1835         __le32 buf[2];
1836         u32 i, nel;
1837
1838         if (p->policyvers < POLICYDB_VERSION_MLS)
1839                 return 0;
1840
1841         rc = next_entry(buf, fp, sizeof(u32));
1842         if (rc)
1843                 return rc;
1844
1845         nel = le32_to_cpu(buf[0]);
1846
1847         rc = hashtab_init(&p->range_tr, nel);
1848         if (rc)
1849                 return rc;
1850
1851         for (i = 0; i < nel; i++) {
1852                 rc = -ENOMEM;
1853                 rt = kzalloc(sizeof(*rt), GFP_KERNEL);
1854                 if (!rt)
1855                         goto out;
1856
1857                 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1858                 if (rc)
1859                         goto out;
1860
1861                 rt->source_type = le32_to_cpu(buf[0]);
1862                 rt->target_type = le32_to_cpu(buf[1]);
1863                 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
1864                         rc = next_entry(buf, fp, sizeof(u32));
1865                         if (rc)
1866                                 goto out;
1867                         rt->target_class = le32_to_cpu(buf[0]);
1868                 } else
1869                         rt->target_class = p->process_class;
1870
1871                 rc = -EINVAL;
1872                 if (!policydb_type_isvalid(p, rt->source_type) ||
1873                     !policydb_type_isvalid(p, rt->target_type) ||
1874                     !policydb_class_isvalid(p, rt->target_class))
1875                         goto out;
1876
1877                 rc = -ENOMEM;
1878                 r = kzalloc(sizeof(*r), GFP_KERNEL);
1879                 if (!r)
1880                         goto out;
1881
1882                 rc = mls_read_range_helper(r, fp);
1883                 if (rc)
1884                         goto out;
1885
1886                 rc = -EINVAL;
1887                 if (!mls_range_isvalid(p, r)) {
1888                         pr_warn("SELinux:  rangetrans:  invalid range\n");
1889                         goto out;
1890                 }
1891
1892                 rc = hashtab_insert(&p->range_tr, rt, r, rangetr_key_params);
1893                 if (rc)
1894                         goto out;
1895
1896                 rt = NULL;
1897                 r = NULL;
1898         }
1899         hash_eval(&p->range_tr, "rangetr");
1900         rc = 0;
1901 out:
1902         kfree(rt);
1903         kfree(r);
1904         return rc;
1905 }
1906
1907 static int filename_trans_read_helper_compat(struct policydb *p, void *fp)
1908 {
1909         struct filename_trans_key key, *ft = NULL;
1910         struct filename_trans_datum *last, *datum = NULL;
1911         char *name = NULL;
1912         u32 len, stype, otype;
1913         __le32 buf[4];
1914         int rc;
1915
1916         /* length of the path component string */
1917         rc = next_entry(buf, fp, sizeof(u32));
1918         if (rc)
1919                 return rc;
1920         len = le32_to_cpu(buf[0]);
1921
1922         /* path component string */
1923         rc = str_read(&name, GFP_KERNEL, fp, len);
1924         if (rc)
1925                 return rc;
1926
1927         rc = next_entry(buf, fp, sizeof(u32) * 4);
1928         if (rc)
1929                 goto out;
1930
1931         stype = le32_to_cpu(buf[0]);
1932         key.ttype = le32_to_cpu(buf[1]);
1933         key.tclass = le32_to_cpu(buf[2]);
1934         key.name = name;
1935
1936         otype = le32_to_cpu(buf[3]);
1937
1938         last = NULL;
1939         datum = policydb_filenametr_search(p, &key);
1940         while (datum) {
1941                 if (unlikely(ebitmap_get_bit(&datum->stypes, stype - 1))) {
1942                         /* conflicting/duplicate rules are ignored */
1943                         datum = NULL;
1944                         goto out;
1945                 }
1946                 if (likely(datum->otype == otype))
1947                         break;
1948                 last = datum;
1949                 datum = datum->next;
1950         }
1951         if (!datum) {
1952                 rc = -ENOMEM;
1953                 datum = kmalloc(sizeof(*datum), GFP_KERNEL);
1954                 if (!datum)
1955                         goto out;
1956
1957                 ebitmap_init(&datum->stypes);
1958                 datum->otype = otype;
1959                 datum->next = NULL;
1960
1961                 if (unlikely(last)) {
1962                         last->next = datum;
1963                 } else {
1964                         rc = -ENOMEM;
1965                         ft = kmemdup(&key, sizeof(key), GFP_KERNEL);
1966                         if (!ft)
1967                                 goto out;
1968
1969                         rc = hashtab_insert(&p->filename_trans, ft, datum,
1970                                             filenametr_key_params);
1971                         if (rc)
1972                                 goto out;
1973                         name = NULL;
1974
1975                         rc = ebitmap_set_bit(&p->filename_trans_ttypes,
1976                                              key.ttype, 1);
1977                         if (rc)
1978                                 return rc;
1979                 }
1980         }
1981         kfree(name);
1982         return ebitmap_set_bit(&datum->stypes, stype - 1, 1);
1983
1984 out:
1985         kfree(ft);
1986         kfree(name);
1987         kfree(datum);
1988         return rc;
1989 }
1990
1991 static int filename_trans_read_helper(struct policydb *p, void *fp)
1992 {
1993         struct filename_trans_key *ft = NULL;
1994         struct filename_trans_datum **dst, *datum, *first = NULL;
1995         char *name = NULL;
1996         u32 len, ttype, tclass, ndatum, i;
1997         __le32 buf[3];
1998         int rc;
1999
2000         /* length of the path component string */
2001         rc = next_entry(buf, fp, sizeof(u32));
2002         if (rc)
2003                 return rc;
2004         len = le32_to_cpu(buf[0]);
2005
2006         /* path component string */
2007         rc = str_read(&name, GFP_KERNEL, fp, len);
2008         if (rc)
2009                 return rc;
2010
2011         rc = next_entry(buf, fp, sizeof(u32) * 3);
2012         if (rc)
2013                 goto out;
2014
2015         ttype = le32_to_cpu(buf[0]);
2016         tclass = le32_to_cpu(buf[1]);
2017
2018         ndatum = le32_to_cpu(buf[2]);
2019         if (ndatum == 0) {
2020                 pr_err("SELinux:  Filename transition key with no datum\n");
2021                 rc = -ENOENT;
2022                 goto out;
2023         }
2024
2025         dst = &first;
2026         for (i = 0; i < ndatum; i++) {
2027                 rc = -ENOMEM;
2028                 datum = kmalloc(sizeof(*datum), GFP_KERNEL);
2029                 if (!datum)
2030                         goto out;
2031
2032                 datum->next = NULL;
2033                 *dst = datum;
2034
2035                 /* ebitmap_read() will at least init the bitmap */
2036                 rc = ebitmap_read(&datum->stypes, fp);
2037                 if (rc)
2038                         goto out;
2039
2040                 rc = next_entry(buf, fp, sizeof(u32));
2041                 if (rc)
2042                         goto out;
2043
2044                 datum->otype = le32_to_cpu(buf[0]);
2045
2046                 dst = &datum->next;
2047         }
2048
2049         rc = -ENOMEM;
2050         ft = kmalloc(sizeof(*ft), GFP_KERNEL);
2051         if (!ft)
2052                 goto out;
2053
2054         ft->ttype = ttype;
2055         ft->tclass = tclass;
2056         ft->name = name;
2057
2058         rc = hashtab_insert(&p->filename_trans, ft, first,
2059                             filenametr_key_params);
2060         if (rc == -EEXIST)
2061                 pr_err("SELinux:  Duplicate filename transition key\n");
2062         if (rc)
2063                 goto out;
2064
2065         return ebitmap_set_bit(&p->filename_trans_ttypes, ttype, 1);
2066
2067 out:
2068         kfree(ft);
2069         kfree(name);
2070         while (first) {
2071                 datum = first;
2072                 first = first->next;
2073
2074                 ebitmap_destroy(&datum->stypes);
2075                 kfree(datum);
2076         }
2077         return rc;
2078 }
2079
2080 static int filename_trans_read(struct policydb *p, void *fp)
2081 {
2082         u32 nel, i;
2083         __le32 buf[1];
2084         int rc;
2085
2086         if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
2087                 return 0;
2088
2089         rc = next_entry(buf, fp, sizeof(u32));
2090         if (rc)
2091                 return rc;
2092         nel = le32_to_cpu(buf[0]);
2093
2094         if (p->policyvers < POLICYDB_VERSION_COMP_FTRANS) {
2095                 p->compat_filename_trans_count = nel;
2096
2097                 rc = hashtab_init(&p->filename_trans, (1 << 11));
2098                 if (rc)
2099                         return rc;
2100
2101                 for (i = 0; i < nel; i++) {
2102                         rc = filename_trans_read_helper_compat(p, fp);
2103                         if (rc)
2104                                 return rc;
2105                 }
2106         } else {
2107                 rc = hashtab_init(&p->filename_trans, nel);
2108                 if (rc)
2109                         return rc;
2110
2111                 for (i = 0; i < nel; i++) {
2112                         rc = filename_trans_read_helper(p, fp);
2113                         if (rc)
2114                                 return rc;
2115                 }
2116         }
2117         hash_eval(&p->filename_trans, "filenametr");
2118         return 0;
2119 }
2120
2121 static int genfs_read(struct policydb *p, void *fp)
2122 {
2123         int rc;
2124         u32 i, j, nel, nel2, len, len2;
2125         __le32 buf[1];
2126         struct ocontext *l, *c;
2127         struct ocontext *newc = NULL;
2128         struct genfs *genfs_p, *genfs;
2129         struct genfs *newgenfs = NULL;
2130
2131         rc = next_entry(buf, fp, sizeof(u32));
2132         if (rc)
2133                 return rc;
2134         nel = le32_to_cpu(buf[0]);
2135
2136         for (i = 0; i < nel; i++) {
2137                 rc = next_entry(buf, fp, sizeof(u32));
2138                 if (rc)
2139                         goto out;
2140                 len = le32_to_cpu(buf[0]);
2141
2142                 rc = -ENOMEM;
2143                 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
2144                 if (!newgenfs)
2145                         goto out;
2146
2147                 rc = str_read(&newgenfs->fstype, GFP_KERNEL, fp, len);
2148                 if (rc)
2149                         goto out;
2150
2151                 for (genfs_p = NULL, genfs = p->genfs; genfs;
2152                      genfs_p = genfs, genfs = genfs->next) {
2153                         rc = -EINVAL;
2154                         if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
2155                                 pr_err("SELinux:  dup genfs fstype %s\n",
2156                                        newgenfs->fstype);
2157                                 goto out;
2158                         }
2159                         if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
2160                                 break;
2161                 }
2162                 newgenfs->next = genfs;
2163                 if (genfs_p)
2164                         genfs_p->next = newgenfs;
2165                 else
2166                         p->genfs = newgenfs;
2167                 genfs = newgenfs;
2168                 newgenfs = NULL;
2169
2170                 rc = next_entry(buf, fp, sizeof(u32));
2171                 if (rc)
2172                         goto out;
2173
2174                 nel2 = le32_to_cpu(buf[0]);
2175                 for (j = 0; j < nel2; j++) {
2176                         rc = next_entry(buf, fp, sizeof(u32));
2177                         if (rc)
2178                                 goto out;
2179                         len = le32_to_cpu(buf[0]);
2180
2181                         rc = -ENOMEM;
2182                         newc = kzalloc(sizeof(*newc), GFP_KERNEL);
2183                         if (!newc)
2184                                 goto out;
2185
2186                         rc = str_read(&newc->u.name, GFP_KERNEL, fp, len);
2187                         if (rc)
2188                                 goto out;
2189
2190                         rc = next_entry(buf, fp, sizeof(u32));
2191                         if (rc)
2192                                 goto out;
2193
2194                         newc->v.sclass = le32_to_cpu(buf[0]);
2195                         rc = context_read_and_validate(&newc->context[0], p, fp);
2196                         if (rc)
2197                                 goto out;
2198
2199                         for (l = NULL, c = genfs->head; c;
2200                              l = c, c = c->next) {
2201                                 rc = -EINVAL;
2202                                 if (!strcmp(newc->u.name, c->u.name) &&
2203                                     (!c->v.sclass || !newc->v.sclass ||
2204                                      newc->v.sclass == c->v.sclass)) {
2205                                         pr_err("SELinux:  dup genfs entry (%s,%s)\n",
2206                                                genfs->fstype, c->u.name);
2207                                         goto out;
2208                                 }
2209                                 len = strlen(newc->u.name);
2210                                 len2 = strlen(c->u.name);
2211                                 if (len > len2)
2212                                         break;
2213                         }
2214
2215                         newc->next = c;
2216                         if (l)
2217                                 l->next = newc;
2218                         else
2219                                 genfs->head = newc;
2220                         newc = NULL;
2221                 }
2222         }
2223         rc = 0;
2224 out:
2225         if (newgenfs) {
2226                 kfree(newgenfs->fstype);
2227                 kfree(newgenfs);
2228         }
2229         ocontext_destroy(newc, OCON_FSUSE);
2230
2231         return rc;
2232 }
2233
2234 static int ocontext_read(struct policydb *p, const struct policydb_compat_info *info,
2235                          void *fp)
2236 {
2237         int rc;
2238         unsigned int i;
2239         u32 j, nel, len;
2240         __be64 prefixbuf[1];
2241         __le32 buf[3];
2242         struct ocontext *l, *c;
2243         u32 nodebuf[8];
2244
2245         for (i = 0; i < info->ocon_num; i++) {
2246                 rc = next_entry(buf, fp, sizeof(u32));
2247                 if (rc)
2248                         goto out;
2249                 nel = le32_to_cpu(buf[0]);
2250
2251                 l = NULL;
2252                 for (j = 0; j < nel; j++) {
2253                         rc = -ENOMEM;
2254                         c = kzalloc(sizeof(*c), GFP_KERNEL);
2255                         if (!c)
2256                                 goto out;
2257                         if (l)
2258                                 l->next = c;
2259                         else
2260                                 p->ocontexts[i] = c;
2261                         l = c;
2262
2263                         switch (i) {
2264                         case OCON_ISID:
2265                                 rc = next_entry(buf, fp, sizeof(u32));
2266                                 if (rc)
2267                                         goto out;
2268
2269                                 c->sid[0] = le32_to_cpu(buf[0]);
2270                                 rc = context_read_and_validate(&c->context[0], p, fp);
2271                                 if (rc)
2272                                         goto out;
2273                                 break;
2274                         case OCON_FS:
2275                         case OCON_NETIF:
2276                                 rc = next_entry(buf, fp, sizeof(u32));
2277                                 if (rc)
2278                                         goto out;
2279                                 len = le32_to_cpu(buf[0]);
2280
2281                                 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2282                                 if (rc)
2283                                         goto out;
2284
2285                                 if (i == OCON_FS)
2286                                         pr_warn("SELinux:  void and deprecated fs ocon %s\n",
2287                                                 c->u.name);
2288
2289                                 rc = context_read_and_validate(&c->context[0], p, fp);
2290                                 if (rc)
2291                                         goto out;
2292                                 rc = context_read_and_validate(&c->context[1], p, fp);
2293                                 if (rc)
2294                                         goto out;
2295                                 break;
2296                         case OCON_PORT:
2297                                 rc = next_entry(buf, fp, sizeof(u32)*3);
2298                                 if (rc)
2299                                         goto out;
2300                                 c->u.port.protocol = le32_to_cpu(buf[0]);
2301                                 c->u.port.low_port = le32_to_cpu(buf[1]);
2302                                 c->u.port.high_port = le32_to_cpu(buf[2]);
2303                                 rc = context_read_and_validate(&c->context[0], p, fp);
2304                                 if (rc)
2305                                         goto out;
2306                                 break;
2307                         case OCON_NODE:
2308                                 rc = next_entry(nodebuf, fp, sizeof(u32) * 2);
2309                                 if (rc)
2310                                         goto out;
2311                                 c->u.node.addr = nodebuf[0]; /* network order */
2312                                 c->u.node.mask = nodebuf[1]; /* network order */
2313                                 rc = context_read_and_validate(&c->context[0], p, fp);
2314                                 if (rc)
2315                                         goto out;
2316                                 break;
2317                         case OCON_FSUSE:
2318                                 rc = next_entry(buf, fp, sizeof(u32)*2);
2319                                 if (rc)
2320                                         goto out;
2321
2322                                 rc = -EINVAL;
2323                                 c->v.behavior = le32_to_cpu(buf[0]);
2324                                 /* Determined at runtime, not in policy DB. */
2325                                 if (c->v.behavior == SECURITY_FS_USE_MNTPOINT)
2326                                         goto out;
2327                                 if (c->v.behavior > SECURITY_FS_USE_MAX)
2328                                         goto out;
2329
2330                                 len = le32_to_cpu(buf[1]);
2331                                 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2332                                 if (rc)
2333                                         goto out;
2334
2335                                 rc = context_read_and_validate(&c->context[0], p, fp);
2336                                 if (rc)
2337                                         goto out;
2338                                 break;
2339                         case OCON_NODE6: {
2340                                 int k;
2341
2342                                 rc = next_entry(nodebuf, fp, sizeof(u32) * 8);
2343                                 if (rc)
2344                                         goto out;
2345                                 for (k = 0; k < 4; k++)
2346                                         c->u.node6.addr[k] = nodebuf[k];
2347                                 for (k = 0; k < 4; k++)
2348                                         c->u.node6.mask[k] = nodebuf[k+4];
2349                                 rc = context_read_and_validate(&c->context[0], p, fp);
2350                                 if (rc)
2351                                         goto out;
2352                                 break;
2353                         }
2354                         case OCON_IBPKEY: {
2355                                 u32 pkey_lo, pkey_hi;
2356
2357                                 rc = next_entry(prefixbuf, fp, sizeof(u64));
2358                                 if (rc)
2359                                         goto out;
2360
2361                                 /* we need to have subnet_prefix in CPU order */
2362                                 c->u.ibpkey.subnet_prefix = be64_to_cpu(prefixbuf[0]);
2363
2364                                 rc = next_entry(buf, fp, sizeof(u32) * 2);
2365                                 if (rc)
2366                                         goto out;
2367
2368                                 pkey_lo = le32_to_cpu(buf[0]);
2369                                 pkey_hi = le32_to_cpu(buf[1]);
2370
2371                                 if (pkey_lo > U16_MAX || pkey_hi > U16_MAX) {
2372                                         rc = -EINVAL;
2373                                         goto out;
2374                                 }
2375
2376                                 c->u.ibpkey.low_pkey  = pkey_lo;
2377                                 c->u.ibpkey.high_pkey = pkey_hi;
2378
2379                                 rc = context_read_and_validate(&c->context[0],
2380                                                                p,
2381                                                                fp);
2382                                 if (rc)
2383                                         goto out;
2384                                 break;
2385                         }
2386                         case OCON_IBENDPORT: {
2387                                 u32 port;
2388
2389                                 rc = next_entry(buf, fp, sizeof(u32) * 2);
2390                                 if (rc)
2391                                         goto out;
2392                                 len = le32_to_cpu(buf[0]);
2393
2394                                 rc = str_read(&c->u.ibendport.dev_name, GFP_KERNEL, fp, len);
2395                                 if (rc)
2396                                         goto out;
2397
2398                                 port = le32_to_cpu(buf[1]);
2399                                 if (port > U8_MAX || port == 0) {
2400                                         rc = -EINVAL;
2401                                         goto out;
2402                                 }
2403
2404                                 c->u.ibendport.port = port;
2405
2406                                 rc = context_read_and_validate(&c->context[0],
2407                                                                p,
2408                                                                fp);
2409                                 if (rc)
2410                                         goto out;
2411                                 break;
2412                         } /* end case */
2413                         } /* end switch */
2414                 }
2415         }
2416         rc = 0;
2417 out:
2418         return rc;
2419 }
2420
2421 /*
2422  * Read the configuration data from a policy database binary
2423  * representation file into a policy database structure.
2424  */
2425 int policydb_read(struct policydb *p, void *fp)
2426 {
2427         struct role_allow *ra, *lra;
2428         struct role_trans_key *rtk = NULL;
2429         struct role_trans_datum *rtd = NULL;
2430         int rc;
2431         __le32 buf[4];
2432         u32 i, j, len, nprim, nel, perm;
2433
2434         char *policydb_str;
2435         const struct policydb_compat_info *info;
2436
2437         policydb_init(p);
2438
2439         /* Read the magic number and string length. */
2440         rc = next_entry(buf, fp, sizeof(u32) * 2);
2441         if (rc)
2442                 goto bad;
2443
2444         rc = -EINVAL;
2445         if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
2446                 pr_err("SELinux:  policydb magic number 0x%x does "
2447                        "not match expected magic number 0x%x\n",
2448                        le32_to_cpu(buf[0]), POLICYDB_MAGIC);
2449                 goto bad;
2450         }
2451
2452         rc = -EINVAL;
2453         len = le32_to_cpu(buf[1]);
2454         if (len != strlen(POLICYDB_STRING)) {
2455                 pr_err("SELinux:  policydb string length %d does not "
2456                        "match expected length %zu\n",
2457                        len, strlen(POLICYDB_STRING));
2458                 goto bad;
2459         }
2460
2461         rc = -ENOMEM;
2462         policydb_str = kmalloc(len + 1, GFP_KERNEL);
2463         if (!policydb_str) {
2464                 pr_err("SELinux:  unable to allocate memory for policydb "
2465                        "string of length %d\n", len);
2466                 goto bad;
2467         }
2468
2469         rc = next_entry(policydb_str, fp, len);
2470         if (rc) {
2471                 pr_err("SELinux:  truncated policydb string identifier\n");
2472                 kfree(policydb_str);
2473                 goto bad;
2474         }
2475
2476         rc = -EINVAL;
2477         policydb_str[len] = '\0';
2478         if (strcmp(policydb_str, POLICYDB_STRING)) {
2479                 pr_err("SELinux:  policydb string %s does not match "
2480                        "my string %s\n", policydb_str, POLICYDB_STRING);
2481                 kfree(policydb_str);
2482                 goto bad;
2483         }
2484         /* Done with policydb_str. */
2485         kfree(policydb_str);
2486         policydb_str = NULL;
2487
2488         /* Read the version and table sizes. */
2489         rc = next_entry(buf, fp, sizeof(u32)*4);
2490         if (rc)
2491                 goto bad;
2492
2493         rc = -EINVAL;
2494         p->policyvers = le32_to_cpu(buf[0]);
2495         if (p->policyvers < POLICYDB_VERSION_MIN ||
2496             p->policyvers > POLICYDB_VERSION_MAX) {
2497                 pr_err("SELinux:  policydb version %d does not match "
2498                        "my version range %d-%d\n",
2499                        le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
2500                 goto bad;
2501         }
2502
2503         if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
2504                 p->mls_enabled = 1;
2505
2506                 rc = -EINVAL;
2507                 if (p->policyvers < POLICYDB_VERSION_MLS) {
2508                         pr_err("SELinux: security policydb version %d "
2509                                 "(MLS) not backwards compatible\n",
2510                                 p->policyvers);
2511                         goto bad;
2512                 }
2513         }
2514         p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
2515         p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
2516
2517         if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
2518                 rc = ebitmap_read(&p->policycaps, fp);
2519                 if (rc)
2520                         goto bad;
2521         }
2522
2523         if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
2524                 rc = ebitmap_read(&p->permissive_map, fp);
2525                 if (rc)
2526                         goto bad;
2527         }
2528
2529         rc = -EINVAL;
2530         info = policydb_lookup_compat(p->policyvers);
2531         if (!info) {
2532                 pr_err("SELinux:  unable to find policy compat info "
2533                        "for version %d\n", p->policyvers);
2534                 goto bad;
2535         }
2536
2537         rc = -EINVAL;
2538         if (le32_to_cpu(buf[2]) != info->sym_num ||
2539                 le32_to_cpu(buf[3]) != info->ocon_num) {
2540                 pr_err("SELinux:  policydb table sizes (%d,%d) do "
2541                        "not match mine (%d,%d)\n", le32_to_cpu(buf[2]),
2542                         le32_to_cpu(buf[3]),
2543                        info->sym_num, info->ocon_num);
2544                 goto bad;
2545         }
2546
2547         for (i = 0; i < info->sym_num; i++) {
2548                 rc = next_entry(buf, fp, sizeof(u32)*2);
2549                 if (rc)
2550                         goto bad;
2551                 nprim = le32_to_cpu(buf[0]);
2552                 nel = le32_to_cpu(buf[1]);
2553
2554                 rc = symtab_init(&p->symtab[i], nel);
2555                 if (rc)
2556                         goto out;
2557
2558                 if (i == SYM_ROLES) {
2559                         rc = roles_init(p);
2560                         if (rc)
2561                                 goto out;
2562                 }
2563
2564                 for (j = 0; j < nel; j++) {
2565                         rc = read_f[i](p, &p->symtab[i], fp);
2566                         if (rc)
2567                                 goto bad;
2568                 }
2569
2570                 p->symtab[i].nprim = nprim;
2571         }
2572
2573         rc = -EINVAL;
2574         p->process_class = string_to_security_class(p, "process");
2575         if (!p->process_class) {
2576                 pr_err("SELinux: process class is required, not defined in policy\n");
2577                 goto bad;
2578         }
2579
2580         rc = avtab_read(&p->te_avtab, fp, p);
2581         if (rc)
2582                 goto bad;
2583
2584         if (p->policyvers >= POLICYDB_VERSION_BOOL) {
2585                 rc = cond_read_list(p, fp);
2586                 if (rc)
2587                         goto bad;
2588         }
2589
2590         rc = next_entry(buf, fp, sizeof(u32));
2591         if (rc)
2592                 goto bad;
2593         nel = le32_to_cpu(buf[0]);
2594
2595         rc = hashtab_init(&p->role_tr, nel);
2596         if (rc)
2597                 goto bad;
2598         for (i = 0; i < nel; i++) {
2599                 rc = -ENOMEM;
2600                 rtk = kmalloc(sizeof(*rtk), GFP_KERNEL);
2601                 if (!rtk)
2602                         goto bad;
2603
2604                 rc = -ENOMEM;
2605                 rtd = kmalloc(sizeof(*rtd), GFP_KERNEL);
2606                 if (!rtd)
2607                         goto bad;
2608
2609                 rc = next_entry(buf, fp, sizeof(u32)*3);
2610                 if (rc)
2611                         goto bad;
2612
2613                 rtk->role = le32_to_cpu(buf[0]);
2614                 rtk->type = le32_to_cpu(buf[1]);
2615                 rtd->new_role = le32_to_cpu(buf[2]);
2616                 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2617                         rc = next_entry(buf, fp, sizeof(u32));
2618                         if (rc)
2619                                 goto bad;
2620                         rtk->tclass = le32_to_cpu(buf[0]);
2621                 } else
2622                         rtk->tclass = p->process_class;
2623
2624                 rc = -EINVAL;
2625                 if (!policydb_role_isvalid(p, rtk->role) ||
2626                     !policydb_type_isvalid(p, rtk->type) ||
2627                     !policydb_class_isvalid(p, rtk->tclass) ||
2628                     !policydb_role_isvalid(p, rtd->new_role))
2629                         goto bad;
2630
2631                 rc = hashtab_insert(&p->role_tr, rtk, rtd, roletr_key_params);
2632                 if (rc)
2633                         goto bad;
2634
2635                 rtk = NULL;
2636                 rtd = NULL;
2637         }
2638
2639         rc = next_entry(buf, fp, sizeof(u32));
2640         if (rc)
2641                 goto bad;
2642         nel = le32_to_cpu(buf[0]);
2643         lra = NULL;
2644         for (i = 0; i < nel; i++) {
2645                 rc = -ENOMEM;
2646                 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
2647                 if (!ra)
2648                         goto bad;
2649                 if (lra)
2650                         lra->next = ra;
2651                 else
2652                         p->role_allow = ra;
2653                 rc = next_entry(buf, fp, sizeof(u32)*2);
2654                 if (rc)
2655                         goto bad;
2656
2657                 rc = -EINVAL;
2658                 ra->role = le32_to_cpu(buf[0]);
2659                 ra->new_role = le32_to_cpu(buf[1]);
2660                 if (!policydb_role_isvalid(p, ra->role) ||
2661                     !policydb_role_isvalid(p, ra->new_role))
2662                         goto bad;
2663                 lra = ra;
2664         }
2665
2666         rc = filename_trans_read(p, fp);
2667         if (rc)
2668                 goto bad;
2669
2670         rc = policydb_index(p);
2671         if (rc)
2672                 goto bad;
2673
2674         rc = -EINVAL;
2675         perm = string_to_av_perm(p, p->process_class, "transition");
2676         if (!perm) {
2677                 pr_err("SELinux: process transition permission is required, not defined in policy\n");
2678                 goto bad;
2679         }
2680         p->process_trans_perms = perm;
2681         perm = string_to_av_perm(p, p->process_class, "dyntransition");
2682         if (!perm) {
2683                 pr_err("SELinux: process dyntransition permission is required, not defined in policy\n");
2684                 goto bad;
2685         }
2686         p->process_trans_perms |= perm;
2687
2688         rc = ocontext_read(p, info, fp);
2689         if (rc)
2690                 goto bad;
2691
2692         rc = genfs_read(p, fp);
2693         if (rc)
2694                 goto bad;
2695
2696         rc = range_read(p, fp);
2697         if (rc)
2698                 goto bad;
2699
2700         rc = -ENOMEM;
2701         p->type_attr_map_array = kvcalloc(p->p_types.nprim,
2702                                           sizeof(*p->type_attr_map_array),
2703                                           GFP_KERNEL);
2704         if (!p->type_attr_map_array)
2705                 goto bad;
2706
2707         /* just in case ebitmap_init() becomes more than just a memset(0): */
2708         for (i = 0; i < p->p_types.nprim; i++)
2709                 ebitmap_init(&p->type_attr_map_array[i]);
2710
2711         for (i = 0; i < p->p_types.nprim; i++) {
2712                 struct ebitmap *e = &p->type_attr_map_array[i];
2713
2714                 if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
2715                         rc = ebitmap_read(e, fp);
2716                         if (rc)
2717                                 goto bad;
2718                 }
2719                 /* add the type itself as the degenerate case */
2720                 rc = ebitmap_set_bit(e, i, 1);
2721                 if (rc)
2722                         goto bad;
2723         }
2724
2725         rc = policydb_bounds_sanity_check(p);
2726         if (rc)
2727                 goto bad;
2728
2729         rc = 0;
2730 out:
2731         return rc;
2732 bad:
2733         kfree(rtk);
2734         kfree(rtd);
2735         policydb_destroy(p);
2736         goto out;
2737 }
2738
2739 /*
2740  * Write a MLS level structure to a policydb binary
2741  * representation file.
2742  */
2743 static int mls_write_level(struct mls_level *l, void *fp)
2744 {
2745         __le32 buf[1];
2746         int rc;
2747
2748         buf[0] = cpu_to_le32(l->sens);
2749         rc = put_entry(buf, sizeof(u32), 1, fp);
2750         if (rc)
2751                 return rc;
2752
2753         rc = ebitmap_write(&l->cat, fp);
2754         if (rc)
2755                 return rc;
2756
2757         return 0;
2758 }
2759
2760 /*
2761  * Write a MLS range structure to a policydb binary
2762  * representation file.
2763  */
2764 static int mls_write_range_helper(struct mls_range *r, void *fp)
2765 {
2766         __le32 buf[3];
2767         size_t items;
2768         int rc, eq;
2769
2770         eq = mls_level_eq(&r->level[1], &r->level[0]);
2771
2772         if (eq)
2773                 items = 2;
2774         else
2775                 items = 3;
2776         buf[0] = cpu_to_le32(items-1);
2777         buf[1] = cpu_to_le32(r->level[0].sens);
2778         if (!eq)
2779                 buf[2] = cpu_to_le32(r->level[1].sens);
2780
2781         BUG_ON(items > ARRAY_SIZE(buf));
2782
2783         rc = put_entry(buf, sizeof(u32), items, fp);
2784         if (rc)
2785                 return rc;
2786
2787         rc = ebitmap_write(&r->level[0].cat, fp);
2788         if (rc)
2789                 return rc;
2790         if (!eq) {
2791                 rc = ebitmap_write(&r->level[1].cat, fp);
2792                 if (rc)
2793                         return rc;
2794         }
2795
2796         return 0;
2797 }
2798
2799 static int sens_write(void *vkey, void *datum, void *ptr)
2800 {
2801         char *key = vkey;
2802         struct level_datum *levdatum = datum;
2803         struct policy_data *pd = ptr;
2804         void *fp = pd->fp;
2805         __le32 buf[2];
2806         size_t len;
2807         int rc;
2808
2809         len = strlen(key);
2810         buf[0] = cpu_to_le32(len);
2811         buf[1] = cpu_to_le32(levdatum->isalias);
2812         rc = put_entry(buf, sizeof(u32), 2, fp);
2813         if (rc)
2814                 return rc;
2815
2816         rc = put_entry(key, 1, len, fp);
2817         if (rc)
2818                 return rc;
2819
2820         rc = mls_write_level(levdatum->level, fp);
2821         if (rc)
2822                 return rc;
2823
2824         return 0;
2825 }
2826
2827 static int cat_write(void *vkey, void *datum, void *ptr)
2828 {
2829         char *key = vkey;
2830         struct cat_datum *catdatum = datum;
2831         struct policy_data *pd = ptr;
2832         void *fp = pd->fp;
2833         __le32 buf[3];
2834         size_t len;
2835         int rc;
2836
2837         len = strlen(key);
2838         buf[0] = cpu_to_le32(len);
2839         buf[1] = cpu_to_le32(catdatum->value);
2840         buf[2] = cpu_to_le32(catdatum->isalias);
2841         rc = put_entry(buf, sizeof(u32), 3, fp);
2842         if (rc)
2843                 return rc;
2844
2845         rc = put_entry(key, 1, len, fp);
2846         if (rc)
2847                 return rc;
2848
2849         return 0;
2850 }
2851
2852 static int role_trans_write_one(void *key, void *datum, void *ptr)
2853 {
2854         struct role_trans_key *rtk = key;
2855         struct role_trans_datum *rtd = datum;
2856         struct policy_data *pd = ptr;
2857         void *fp = pd->fp;
2858         struct policydb *p = pd->p;
2859         __le32 buf[3];
2860         int rc;
2861
2862         buf[0] = cpu_to_le32(rtk->role);
2863         buf[1] = cpu_to_le32(rtk->type);
2864         buf[2] = cpu_to_le32(rtd->new_role);
2865         rc = put_entry(buf, sizeof(u32), 3, fp);
2866         if (rc)
2867                 return rc;
2868         if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2869                 buf[0] = cpu_to_le32(rtk->tclass);
2870                 rc = put_entry(buf, sizeof(u32), 1, fp);
2871                 if (rc)
2872                         return rc;
2873         }
2874         return 0;
2875 }
2876
2877 static int role_trans_write(struct policydb *p, void *fp)
2878 {
2879         struct policy_data pd = { .p = p, .fp = fp };
2880         __le32 buf[1];
2881         int rc;
2882
2883         buf[0] = cpu_to_le32(p->role_tr.nel);
2884         rc = put_entry(buf, sizeof(u32), 1, fp);
2885         if (rc)
2886                 return rc;
2887
2888         return hashtab_map(&p->role_tr, role_trans_write_one, &pd);
2889 }
2890
2891 static int role_allow_write(struct role_allow *r, void *fp)
2892 {
2893         struct role_allow *ra;
2894         __le32 buf[2];
2895         size_t nel;
2896         int rc;
2897
2898         nel = 0;
2899         for (ra = r; ra; ra = ra->next)
2900                 nel++;
2901         buf[0] = cpu_to_le32(nel);
2902         rc = put_entry(buf, sizeof(u32), 1, fp);
2903         if (rc)
2904                 return rc;
2905         for (ra = r; ra; ra = ra->next) {
2906                 buf[0] = cpu_to_le32(ra->role);
2907                 buf[1] = cpu_to_le32(ra->new_role);
2908                 rc = put_entry(buf, sizeof(u32), 2, fp);
2909                 if (rc)
2910                         return rc;
2911         }
2912         return 0;
2913 }
2914
2915 /*
2916  * Write a security context structure
2917  * to a policydb binary representation file.
2918  */
2919 static int context_write(struct policydb *p, struct context *c,
2920                          void *fp)
2921 {
2922         int rc;
2923         __le32 buf[3];
2924
2925         buf[0] = cpu_to_le32(c->user);
2926         buf[1] = cpu_to_le32(c->role);
2927         buf[2] = cpu_to_le32(c->type);
2928
2929         rc = put_entry(buf, sizeof(u32), 3, fp);
2930         if (rc)
2931                 return rc;
2932
2933         rc = mls_write_range_helper(&c->range, fp);
2934         if (rc)
2935                 return rc;
2936
2937         return 0;
2938 }
2939
2940 /*
2941  * The following *_write functions are used to
2942  * write the symbol data to a policy database
2943  * binary representation file.
2944  */
2945
2946 static int perm_write(void *vkey, void *datum, void *fp)
2947 {
2948         char *key = vkey;
2949         struct perm_datum *perdatum = datum;
2950         __le32 buf[2];
2951         size_t len;
2952         int rc;
2953
2954         len = strlen(key);
2955         buf[0] = cpu_to_le32(len);
2956         buf[1] = cpu_to_le32(perdatum->value);
2957         rc = put_entry(buf, sizeof(u32), 2, fp);
2958         if (rc)
2959                 return rc;
2960
2961         rc = put_entry(key, 1, len, fp);
2962         if (rc)
2963                 return rc;
2964
2965         return 0;
2966 }
2967
2968 static int common_write(void *vkey, void *datum, void *ptr)
2969 {
2970         char *key = vkey;
2971         struct common_datum *comdatum = datum;
2972         struct policy_data *pd = ptr;
2973         void *fp = pd->fp;
2974         __le32 buf[4];
2975         size_t len;
2976         int rc;
2977
2978         len = strlen(key);
2979         buf[0] = cpu_to_le32(len);
2980         buf[1] = cpu_to_le32(comdatum->value);
2981         buf[2] = cpu_to_le32(comdatum->permissions.nprim);
2982         buf[3] = cpu_to_le32(comdatum->permissions.table.nel);
2983         rc = put_entry(buf, sizeof(u32), 4, fp);
2984         if (rc)
2985                 return rc;
2986
2987         rc = put_entry(key, 1, len, fp);
2988         if (rc)
2989                 return rc;
2990
2991         rc = hashtab_map(&comdatum->permissions.table, perm_write, fp);
2992         if (rc)
2993                 return rc;
2994
2995         return 0;
2996 }
2997
2998 static int type_set_write(struct type_set *t, void *fp)
2999 {
3000         int rc;
3001         __le32 buf[1];
3002
3003         if (ebitmap_write(&t->types, fp))
3004                 return -EINVAL;
3005         if (ebitmap_write(&t->negset, fp))
3006                 return -EINVAL;
3007
3008         buf[0] = cpu_to_le32(t->flags);
3009         rc = put_entry(buf, sizeof(u32), 1, fp);
3010         if (rc)
3011                 return -EINVAL;
3012
3013         return 0;
3014 }
3015
3016 static int write_cons_helper(struct policydb *p, struct constraint_node *node,
3017                              void *fp)
3018 {
3019         struct constraint_node *c;
3020         struct constraint_expr *e;
3021         __le32 buf[3];
3022         u32 nel;
3023         int rc;
3024
3025         for (c = node; c; c = c->next) {
3026                 nel = 0;
3027                 for (e = c->expr; e; e = e->next)
3028                         nel++;
3029                 buf[0] = cpu_to_le32(c->permissions);
3030                 buf[1] = cpu_to_le32(nel);
3031                 rc = put_entry(buf, sizeof(u32), 2, fp);
3032                 if (rc)
3033                         return rc;
3034                 for (e = c->expr; e; e = e->next) {
3035                         buf[0] = cpu_to_le32(e->expr_type);
3036                         buf[1] = cpu_to_le32(e->attr);
3037                         buf[2] = cpu_to_le32(e->op);
3038                         rc = put_entry(buf, sizeof(u32), 3, fp);
3039                         if (rc)
3040                                 return rc;
3041
3042                         switch (e->expr_type) {
3043                         case CEXPR_NAMES:
3044                                 rc = ebitmap_write(&e->names, fp);
3045                                 if (rc)
3046                                         return rc;
3047                                 if (p->policyvers >=
3048                                         POLICYDB_VERSION_CONSTRAINT_NAMES) {
3049                                         rc = type_set_write(e->type_names, fp);
3050                                         if (rc)
3051                                                 return rc;
3052                                 }
3053                                 break;
3054                         default:
3055                                 break;
3056                         }
3057                 }
3058         }
3059
3060         return 0;
3061 }
3062
3063 static int class_write(void *vkey, void *datum, void *ptr)
3064 {
3065         char *key = vkey;
3066         struct class_datum *cladatum = datum;
3067         struct policy_data *pd = ptr;
3068         void *fp = pd->fp;
3069         struct policydb *p = pd->p;
3070         struct constraint_node *c;
3071         __le32 buf[6];
3072         u32 ncons;
3073         size_t len, len2;
3074         int rc;
3075
3076         len = strlen(key);
3077         if (cladatum->comkey)
3078                 len2 = strlen(cladatum->comkey);
3079         else
3080                 len2 = 0;
3081
3082         ncons = 0;
3083         for (c = cladatum->constraints; c; c = c->next)
3084                 ncons++;
3085
3086         buf[0] = cpu_to_le32(len);
3087         buf[1] = cpu_to_le32(len2);
3088         buf[2] = cpu_to_le32(cladatum->value);
3089         buf[3] = cpu_to_le32(cladatum->permissions.nprim);
3090         buf[4] = cpu_to_le32(cladatum->permissions.table.nel);
3091         buf[5] = cpu_to_le32(ncons);
3092         rc = put_entry(buf, sizeof(u32), 6, fp);
3093         if (rc)
3094                 return rc;
3095
3096         rc = put_entry(key, 1, len, fp);
3097         if (rc)
3098                 return rc;
3099
3100         if (cladatum->comkey) {
3101                 rc = put_entry(cladatum->comkey, 1, len2, fp);
3102                 if (rc)
3103                         return rc;
3104         }
3105
3106         rc = hashtab_map(&cladatum->permissions.table, perm_write, fp);
3107         if (rc)
3108                 return rc;
3109
3110         rc = write_cons_helper(p, cladatum->constraints, fp);
3111         if (rc)
3112                 return rc;
3113
3114         /* write out the validatetrans rule */
3115         ncons = 0;
3116         for (c = cladatum->validatetrans; c; c = c->next)
3117                 ncons++;
3118
3119         buf[0] = cpu_to_le32(ncons);
3120         rc = put_entry(buf, sizeof(u32), 1, fp);
3121         if (rc)
3122                 return rc;
3123
3124         rc = write_cons_helper(p, cladatum->validatetrans, fp);
3125         if (rc)
3126                 return rc;
3127
3128         if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
3129                 buf[0] = cpu_to_le32(cladatum->default_user);
3130                 buf[1] = cpu_to_le32(cladatum->default_role);
3131                 buf[2] = cpu_to_le32(cladatum->default_range);
3132
3133                 rc = put_entry(buf, sizeof(uint32_t), 3, fp);
3134                 if (rc)
3135                         return rc;
3136         }
3137
3138         if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
3139                 buf[0] = cpu_to_le32(cladatum->default_type);
3140                 rc = put_entry(buf, sizeof(uint32_t), 1, fp);
3141                 if (rc)
3142                         return rc;
3143         }
3144
3145         return 0;
3146 }
3147
3148 static int role_write(void *vkey, void *datum, void *ptr)
3149 {
3150         char *key = vkey;
3151         struct role_datum *role = datum;
3152         struct policy_data *pd = ptr;
3153         void *fp = pd->fp;
3154         struct policydb *p = pd->p;
3155         __le32 buf[3];
3156         size_t items, len;
3157         int rc;
3158
3159         len = strlen(key);
3160         items = 0;
3161         buf[items++] = cpu_to_le32(len);
3162         buf[items++] = cpu_to_le32(role->value);
3163         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
3164                 buf[items++] = cpu_to_le32(role->bounds);
3165
3166         BUG_ON(items > ARRAY_SIZE(buf));
3167
3168         rc = put_entry(buf, sizeof(u32), items, fp);
3169         if (rc)
3170                 return rc;
3171
3172         rc = put_entry(key, 1, len, fp);
3173         if (rc)
3174                 return rc;
3175
3176         rc = ebitmap_write(&role->dominates, fp);
3177         if (rc)
3178                 return rc;
3179
3180         rc = ebitmap_write(&role->types, fp);
3181         if (rc)
3182                 return rc;
3183
3184         return 0;
3185 }
3186
3187 static int type_write(void *vkey, void *datum, void *ptr)
3188 {
3189         char *key = vkey;
3190         struct type_datum *typdatum = datum;
3191         struct policy_data *pd = ptr;
3192         struct policydb *p = pd->p;
3193         void *fp = pd->fp;
3194         __le32 buf[4];
3195         int rc;
3196         size_t items, len;
3197
3198         len = strlen(key);
3199         items = 0;
3200         buf[items++] = cpu_to_le32(len);
3201         buf[items++] = cpu_to_le32(typdatum->value);
3202         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
3203                 u32 properties = 0;
3204
3205                 if (typdatum->primary)
3206                         properties |= TYPEDATUM_PROPERTY_PRIMARY;
3207
3208                 if (typdatum->attribute)
3209                         properties |= TYPEDATUM_PROPERTY_ATTRIBUTE;
3210
3211                 buf[items++] = cpu_to_le32(properties);
3212                 buf[items++] = cpu_to_le32(typdatum->bounds);
3213         } else {
3214                 buf[items++] = cpu_to_le32(typdatum->primary);
3215         }
3216         BUG_ON(items > ARRAY_SIZE(buf));
3217         rc = put_entry(buf, sizeof(u32), items, fp);
3218         if (rc)
3219                 return rc;
3220
3221         rc = put_entry(key, 1, len, fp);
3222         if (rc)
3223                 return rc;
3224
3225         return 0;
3226 }
3227
3228 static int user_write(void *vkey, void *datum, void *ptr)
3229 {
3230         char *key = vkey;
3231         struct user_datum *usrdatum = datum;
3232         struct policy_data *pd = ptr;
3233         struct policydb *p = pd->p;
3234         void *fp = pd->fp;
3235         __le32 buf[3];
3236         size_t items, len;
3237         int rc;
3238
3239         len = strlen(key);
3240         items = 0;
3241         buf[items++] = cpu_to_le32(len);
3242         buf[items++] = cpu_to_le32(usrdatum->value);
3243         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
3244                 buf[items++] = cpu_to_le32(usrdatum->bounds);
3245         BUG_ON(items > ARRAY_SIZE(buf));
3246         rc = put_entry(buf, sizeof(u32), items, fp);
3247         if (rc)
3248                 return rc;
3249
3250         rc = put_entry(key, 1, len, fp);
3251         if (rc)
3252                 return rc;
3253
3254         rc = ebitmap_write(&usrdatum->roles, fp);
3255         if (rc)
3256                 return rc;
3257
3258         rc = mls_write_range_helper(&usrdatum->range, fp);
3259         if (rc)
3260                 return rc;
3261
3262         rc = mls_write_level(&usrdatum->dfltlevel, fp);
3263         if (rc)
3264                 return rc;
3265
3266         return 0;
3267 }
3268
3269 static int (*const write_f[SYM_NUM]) (void *key, void *datum, void *datap) = {
3270         common_write,
3271         class_write,
3272         role_write,
3273         type_write,
3274         user_write,
3275         cond_write_bool,
3276         sens_write,
3277         cat_write,
3278 };
3279
3280 static int ocontext_write(struct policydb *p, const struct policydb_compat_info *info,
3281                           void *fp)
3282 {
3283         unsigned int i, j;
3284         int rc;
3285         size_t nel, len;
3286         __be64 prefixbuf[1];
3287         __le32 buf[3];
3288         u32 nodebuf[8];
3289         struct ocontext *c;
3290         for (i = 0; i < info->ocon_num; i++) {
3291                 nel = 0;
3292                 for (c = p->ocontexts[i]; c; c = c->next)
3293                         nel++;
3294                 buf[0] = cpu_to_le32(nel);
3295                 rc = put_entry(buf, sizeof(u32), 1, fp);
3296                 if (rc)
3297                         return rc;
3298                 for (c = p->ocontexts[i]; c; c = c->next) {
3299                         switch (i) {
3300                         case OCON_ISID:
3301                                 buf[0] = cpu_to_le32(c->sid[0]);
3302                                 rc = put_entry(buf, sizeof(u32), 1, fp);
3303                                 if (rc)
3304                                         return rc;
3305                                 rc = context_write(p, &c->context[0], fp);
3306                                 if (rc)
3307                                         return rc;
3308                                 break;
3309                         case OCON_FS:
3310                         case OCON_NETIF:
3311                                 len = strlen(c->u.name);
3312                                 buf[0] = cpu_to_le32(len);
3313                                 rc = put_entry(buf, sizeof(u32), 1, fp);
3314                                 if (rc)
3315                                         return rc;
3316                                 rc = put_entry(c->u.name, 1, len, fp);
3317                                 if (rc)
3318                                         return rc;
3319                                 rc = context_write(p, &c->context[0], fp);
3320                                 if (rc)
3321                                         return rc;
3322                                 rc = context_write(p, &c->context[1], fp);
3323                                 if (rc)
3324                                         return rc;
3325                                 break;
3326                         case OCON_PORT:
3327                                 buf[0] = cpu_to_le32(c->u.port.protocol);
3328                                 buf[1] = cpu_to_le32(c->u.port.low_port);
3329                                 buf[2] = cpu_to_le32(c->u.port.high_port);
3330                                 rc = put_entry(buf, sizeof(u32), 3, fp);
3331                                 if (rc)
3332                                         return rc;
3333                                 rc = context_write(p, &c->context[0], fp);
3334                                 if (rc)
3335                                         return rc;
3336                                 break;
3337                         case OCON_NODE:
3338                                 nodebuf[0] = c->u.node.addr; /* network order */
3339                                 nodebuf[1] = c->u.node.mask; /* network order */
3340                                 rc = put_entry(nodebuf, sizeof(u32), 2, fp);
3341                                 if (rc)
3342                                         return rc;
3343                                 rc = context_write(p, &c->context[0], fp);
3344                                 if (rc)
3345                                         return rc;
3346                                 break;
3347                         case OCON_FSUSE:
3348                                 buf[0] = cpu_to_le32(c->v.behavior);
3349                                 len = strlen(c->u.name);
3350                                 buf[1] = cpu_to_le32(len);
3351                                 rc = put_entry(buf, sizeof(u32), 2, fp);
3352                                 if (rc)
3353                                         return rc;
3354                                 rc = put_entry(c->u.name, 1, len, fp);
3355                                 if (rc)
3356                                         return rc;
3357                                 rc = context_write(p, &c->context[0], fp);
3358                                 if (rc)
3359                                         return rc;
3360                                 break;
3361                         case OCON_NODE6:
3362                                 for (j = 0; j < 4; j++)
3363                                         nodebuf[j] = c->u.node6.addr[j]; /* network order */
3364                                 for (j = 0; j < 4; j++)
3365                                         nodebuf[j + 4] = c->u.node6.mask[j]; /* network order */
3366                                 rc = put_entry(nodebuf, sizeof(u32), 8, fp);
3367                                 if (rc)
3368                                         return rc;
3369                                 rc = context_write(p, &c->context[0], fp);
3370                                 if (rc)
3371                                         return rc;
3372                                 break;
3373                         case OCON_IBPKEY:
3374                                 /* subnet_prefix is in CPU order */
3375                                 prefixbuf[0] = cpu_to_be64(c->u.ibpkey.subnet_prefix);
3376
3377                                 rc = put_entry(prefixbuf, sizeof(u64), 1, fp);
3378                                 if (rc)
3379                                         return rc;
3380
3381                                 buf[0] = cpu_to_le32(c->u.ibpkey.low_pkey);
3382                                 buf[1] = cpu_to_le32(c->u.ibpkey.high_pkey);
3383
3384                                 rc = put_entry(buf, sizeof(u32), 2, fp);
3385                                 if (rc)
3386                                         return rc;
3387                                 rc = context_write(p, &c->context[0], fp);
3388                                 if (rc)
3389                                         return rc;
3390                                 break;
3391                         case OCON_IBENDPORT:
3392                                 len = strlen(c->u.ibendport.dev_name);
3393                                 buf[0] = cpu_to_le32(len);
3394                                 buf[1] = cpu_to_le32(c->u.ibendport.port);
3395                                 rc = put_entry(buf, sizeof(u32), 2, fp);
3396                                 if (rc)
3397                                         return rc;
3398                                 rc = put_entry(c->u.ibendport.dev_name, 1, len, fp);
3399                                 if (rc)
3400                                         return rc;
3401                                 rc = context_write(p, &c->context[0], fp);
3402                                 if (rc)
3403                                         return rc;
3404                                 break;
3405                         }
3406                 }
3407         }
3408         return 0;
3409 }
3410
3411 static int genfs_write(struct policydb *p, void *fp)
3412 {
3413         struct genfs *genfs;
3414         struct ocontext *c;
3415         size_t len;
3416         __le32 buf[1];
3417         int rc;
3418
3419         len = 0;
3420         for (genfs = p->genfs; genfs; genfs = genfs->next)
3421                 len++;
3422         buf[0] = cpu_to_le32(len);
3423         rc = put_entry(buf, sizeof(u32), 1, fp);
3424         if (rc)
3425                 return rc;
3426         for (genfs = p->genfs; genfs; genfs = genfs->next) {
3427                 len = strlen(genfs->fstype);
3428                 buf[0] = cpu_to_le32(len);
3429                 rc = put_entry(buf, sizeof(u32), 1, fp);
3430                 if (rc)
3431                         return rc;
3432                 rc = put_entry(genfs->fstype, 1, len, fp);
3433                 if (rc)
3434                         return rc;
3435                 len = 0;
3436                 for (c = genfs->head; c; c = c->next)
3437                         len++;
3438                 buf[0] = cpu_to_le32(len);
3439                 rc = put_entry(buf, sizeof(u32), 1, fp);
3440                 if (rc)
3441                         return rc;
3442                 for (c = genfs->head; c; c = c->next) {
3443                         len = strlen(c->u.name);
3444                         buf[0] = cpu_to_le32(len);
3445                         rc = put_entry(buf, sizeof(u32), 1, fp);
3446                         if (rc)
3447                                 return rc;
3448                         rc = put_entry(c->u.name, 1, len, fp);
3449                         if (rc)
3450                                 return rc;
3451                         buf[0] = cpu_to_le32(c->v.sclass);
3452                         rc = put_entry(buf, sizeof(u32), 1, fp);
3453                         if (rc)
3454                                 return rc;
3455                         rc = context_write(p, &c->context[0], fp);
3456                         if (rc)
3457                                 return rc;
3458                 }
3459         }
3460         return 0;
3461 }
3462
3463 static int range_write_helper(void *key, void *data, void *ptr)
3464 {
3465         __le32 buf[2];
3466         struct range_trans *rt = key;
3467         struct mls_range *r = data;
3468         struct policy_data *pd = ptr;
3469         void *fp = pd->fp;
3470         struct policydb *p = pd->p;
3471         int rc;
3472
3473         buf[0] = cpu_to_le32(rt->source_type);
3474         buf[1] = cpu_to_le32(rt->target_type);
3475         rc = put_entry(buf, sizeof(u32), 2, fp);
3476         if (rc)
3477                 return rc;
3478         if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
3479                 buf[0] = cpu_to_le32(rt->target_class);
3480                 rc = put_entry(buf, sizeof(u32), 1, fp);
3481                 if (rc)
3482                         return rc;
3483         }
3484         rc = mls_write_range_helper(r, fp);
3485         if (rc)
3486                 return rc;
3487
3488         return 0;
3489 }
3490
3491 static int range_write(struct policydb *p, void *fp)
3492 {
3493         __le32 buf[1];
3494         int rc;
3495         struct policy_data pd;
3496
3497         pd.p = p;
3498         pd.fp = fp;
3499
3500         buf[0] = cpu_to_le32(p->range_tr.nel);
3501         rc = put_entry(buf, sizeof(u32), 1, fp);
3502         if (rc)
3503                 return rc;
3504
3505         /* actually write all of the entries */
3506         rc = hashtab_map(&p->range_tr, range_write_helper, &pd);
3507         if (rc)
3508                 return rc;
3509
3510         return 0;
3511 }
3512
3513 static int filename_write_helper_compat(void *key, void *data, void *ptr)
3514 {
3515         struct filename_trans_key *ft = key;
3516         struct filename_trans_datum *datum = data;
3517         struct ebitmap_node *node;
3518         void *fp = ptr;
3519         __le32 buf[4];
3520         int rc;
3521         u32 bit, len = strlen(ft->name);
3522
3523         do {
3524                 ebitmap_for_each_positive_bit(&datum->stypes, node, bit) {
3525                         buf[0] = cpu_to_le32(len);
3526                         rc = put_entry(buf, sizeof(u32), 1, fp);
3527                         if (rc)
3528                                 return rc;
3529
3530                         rc = put_entry(ft->name, sizeof(char), len, fp);
3531                         if (rc)
3532                                 return rc;
3533
3534                         buf[0] = cpu_to_le32(bit + 1);
3535                         buf[1] = cpu_to_le32(ft->ttype);
3536                         buf[2] = cpu_to_le32(ft->tclass);
3537                         buf[3] = cpu_to_le32(datum->otype);
3538
3539                         rc = put_entry(buf, sizeof(u32), 4, fp);
3540                         if (rc)
3541                                 return rc;
3542                 }
3543
3544                 datum = datum->next;
3545         } while (unlikely(datum));
3546
3547         return 0;
3548 }
3549
3550 static int filename_write_helper(void *key, void *data, void *ptr)
3551 {
3552         struct filename_trans_key *ft = key;
3553         struct filename_trans_datum *datum;
3554         void *fp = ptr;
3555         __le32 buf[3];
3556         int rc;
3557         u32 ndatum, len = strlen(ft->name);
3558
3559         buf[0] = cpu_to_le32(len);
3560         rc = put_entry(buf, sizeof(u32), 1, fp);
3561         if (rc)
3562                 return rc;
3563
3564         rc = put_entry(ft->name, sizeof(char), len, fp);
3565         if (rc)
3566                 return rc;
3567
3568         ndatum = 0;
3569         datum = data;
3570         do {
3571                 ndatum++;
3572                 datum = datum->next;
3573         } while (unlikely(datum));
3574
3575         buf[0] = cpu_to_le32(ft->ttype);
3576         buf[1] = cpu_to_le32(ft->tclass);
3577         buf[2] = cpu_to_le32(ndatum);
3578         rc = put_entry(buf, sizeof(u32), 3, fp);
3579         if (rc)
3580                 return rc;
3581
3582         datum = data;
3583         do {
3584                 rc = ebitmap_write(&datum->stypes, fp);
3585                 if (rc)
3586                         return rc;
3587
3588                 buf[0] = cpu_to_le32(datum->otype);
3589                 rc = put_entry(buf, sizeof(u32), 1, fp);
3590                 if (rc)
3591                         return rc;
3592
3593                 datum = datum->next;
3594         } while (unlikely(datum));
3595
3596         return 0;
3597 }
3598
3599 static int filename_trans_write(struct policydb *p, void *fp)
3600 {
3601         __le32 buf[1];
3602         int rc;
3603
3604         if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
3605                 return 0;
3606
3607         if (p->policyvers < POLICYDB_VERSION_COMP_FTRANS) {
3608                 buf[0] = cpu_to_le32(p->compat_filename_trans_count);
3609                 rc = put_entry(buf, sizeof(u32), 1, fp);
3610                 if (rc)
3611                         return rc;
3612
3613                 rc = hashtab_map(&p->filename_trans,
3614                                  filename_write_helper_compat, fp);
3615         } else {
3616                 buf[0] = cpu_to_le32(p->filename_trans.nel);
3617                 rc = put_entry(buf, sizeof(u32), 1, fp);
3618                 if (rc)
3619                         return rc;
3620
3621                 rc = hashtab_map(&p->filename_trans, filename_write_helper, fp);
3622         }
3623         return rc;
3624 }
3625
3626 /*
3627  * Write the configuration data in a policy database
3628  * structure to a policy database binary representation
3629  * file.
3630  */
3631 int policydb_write(struct policydb *p, void *fp)
3632 {
3633         unsigned int num_syms;
3634         int rc;
3635         __le32 buf[4];
3636         u32 config, i;
3637         size_t len;
3638         const struct policydb_compat_info *info;
3639
3640         /*
3641          * refuse to write policy older than compressed avtab
3642          * to simplify the writer.  There are other tests dropped
3643          * since we assume this throughout the writer code.  Be
3644          * careful if you ever try to remove this restriction
3645          */
3646         if (p->policyvers < POLICYDB_VERSION_AVTAB) {
3647                 pr_err("SELinux: refusing to write policy version %d."
3648                        "  Because it is less than version %d\n", p->policyvers,
3649                        POLICYDB_VERSION_AVTAB);
3650                 return -EINVAL;
3651         }
3652
3653         config = 0;
3654         if (p->mls_enabled)
3655                 config |= POLICYDB_CONFIG_MLS;
3656
3657         if (p->reject_unknown)
3658                 config |= REJECT_UNKNOWN;
3659         if (p->allow_unknown)
3660                 config |= ALLOW_UNKNOWN;
3661
3662         /* Write the magic number and string identifiers. */
3663         buf[0] = cpu_to_le32(POLICYDB_MAGIC);
3664         len = strlen(POLICYDB_STRING);
3665         buf[1] = cpu_to_le32(len);
3666         rc = put_entry(buf, sizeof(u32), 2, fp);
3667         if (rc)
3668                 return rc;
3669         rc = put_entry(POLICYDB_STRING, 1, len, fp);
3670         if (rc)
3671                 return rc;
3672
3673         /* Write the version, config, and table sizes. */
3674         info = policydb_lookup_compat(p->policyvers);
3675         if (!info) {
3676                 pr_err("SELinux: compatibility lookup failed for policy "
3677                     "version %d\n", p->policyvers);
3678                 return -EINVAL;
3679         }
3680
3681         buf[0] = cpu_to_le32(p->policyvers);
3682         buf[1] = cpu_to_le32(config);
3683         buf[2] = cpu_to_le32(info->sym_num);
3684         buf[3] = cpu_to_le32(info->ocon_num);
3685
3686         rc = put_entry(buf, sizeof(u32), 4, fp);
3687         if (rc)
3688                 return rc;
3689
3690         if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
3691                 rc = ebitmap_write(&p->policycaps, fp);
3692                 if (rc)
3693                         return rc;
3694         }
3695
3696         if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
3697                 rc = ebitmap_write(&p->permissive_map, fp);
3698                 if (rc)
3699                         return rc;
3700         }
3701
3702         num_syms = info->sym_num;
3703         for (i = 0; i < num_syms; i++) {
3704                 struct policy_data pd;
3705
3706                 pd.fp = fp;
3707                 pd.p = p;
3708
3709                 buf[0] = cpu_to_le32(p->symtab[i].nprim);
3710                 buf[1] = cpu_to_le32(p->symtab[i].table.nel);
3711
3712                 rc = put_entry(buf, sizeof(u32), 2, fp);
3713                 if (rc)
3714                         return rc;
3715                 rc = hashtab_map(&p->symtab[i].table, write_f[i], &pd);
3716                 if (rc)
3717                         return rc;
3718         }
3719
3720         rc = avtab_write(p, &p->te_avtab, fp);
3721         if (rc)
3722                 return rc;
3723
3724         rc = cond_write_list(p, fp);
3725         if (rc)
3726                 return rc;
3727
3728         rc = role_trans_write(p, fp);
3729         if (rc)
3730                 return rc;
3731
3732         rc = role_allow_write(p->role_allow, fp);
3733         if (rc)
3734                 return rc;
3735
3736         rc = filename_trans_write(p, fp);
3737         if (rc)
3738                 return rc;
3739
3740         rc = ocontext_write(p, info, fp);
3741         if (rc)
3742                 return rc;
3743
3744         rc = genfs_write(p, fp);
3745         if (rc)
3746                 return rc;
3747
3748         rc = range_write(p, fp);
3749         if (rc)
3750                 return rc;
3751
3752         for (i = 0; i < p->p_types.nprim; i++) {
3753                 struct ebitmap *e = &p->type_attr_map_array[i];
3754
3755                 rc = ebitmap_write(e, fp);
3756                 if (rc)
3757                         return rc;
3758         }
3759
3760         return 0;
3761 }