security/selinux/ss/policydb.c

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