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