security/selinux/ss/policydb.c

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