Pileus Git - ~andy/linux/blob - security/selinux/ss/policydb.c

   1 /*
   2  * Implementation of the policy database.
   3  *
   4  * Author : Stephen Smalley, <sds@epoch.ncsc.mil>
   5  */
   6
   7 /*
   8  * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
   9  *
  10  *      Support for enhanced MLS infrastructure.
  11  *
  12  * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
  13  *
  14  *      Added conditional policy language extensions
  15  *
  16  * Updated: Hewlett-Packard <paul.moore@hp.com>
  17  *
  18  *      Added support for the policy capability bitmap
  19  *
  20  * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
  21  * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
  22  * Copyright (C) 2003 - 2004 Tresys Technology, LLC
  23  *      This program is free software; you can redistribute it and/or modify
  24  *      it under the terms of the GNU General Public License as published by
  25  *      the Free Software Foundation, version 2.
  26  */
  27
  28 #include <linux/kernel.h>
  29 #include <linux/sched.h>
  30 #include <linux/slab.h>
  31 #include <linux/string.h>
  32 #include <linux/errno.h>
  33 #include <linux/audit.h>
  34 #include "security.h"
  35
  36 #include "policydb.h"
  37 #include "conditional.h"
  38 #include "mls.h"
  39
  40 #define _DEBUG_HASHES
  41
  42 #ifdef DEBUG_HASHES
  43 static char *symtab_name[SYM_NUM] = {
  44         "common prefixes",
  45         "classes",
  46         "roles",
  47         "types",
  48         "users",
  49         "bools",
  50         "levels",
  51         "categories",
  52 };
  53 #endif
  54
  55 int selinux_mls_enabled;
  56
  57 static unsigned int symtab_sizes[SYM_NUM] = {
  58         2,
  59         32,
  60         16,
  61         512,
  62         128,
  63         16,
  64         16,
  65         16,
  66 };
  67
  68 struct policydb_compat_info {
  69         int version;
  70         int sym_num;
  71         int ocon_num;
  72 };
  73
  74 /* These need to be updated if SYM_NUM or OCON_NUM changes */
  75 static struct policydb_compat_info policydb_compat[] = {
  76         {
  77                 .version        = POLICYDB_VERSION_BASE,
  78                 .sym_num        = SYM_NUM - 3,
  79                 .ocon_num       = OCON_NUM - 1,
  80         },
  81         {
  82                 .version        = POLICYDB_VERSION_BOOL,
  83                 .sym_num        = SYM_NUM - 2,
  84                 .ocon_num       = OCON_NUM - 1,
  85         },
  86         {
  87                 .version        = POLICYDB_VERSION_IPV6,
  88                 .sym_num        = SYM_NUM - 2,
  89                 .ocon_num       = OCON_NUM,
  90         },
  91         {
  92                 .version        = POLICYDB_VERSION_NLCLASS,
  93                 .sym_num        = SYM_NUM - 2,
  94                 .ocon_num       = OCON_NUM,
  95         },
  96         {
  97                 .version        = POLICYDB_VERSION_MLS,
  98                 .sym_num        = SYM_NUM,
  99                 .ocon_num       = OCON_NUM,
 100         },
 101         {
 102                 .version        = POLICYDB_VERSION_AVTAB,
 103                 .sym_num        = SYM_NUM,
 104                 .ocon_num       = OCON_NUM,
 105         },
 106         {
 107                 .version        = POLICYDB_VERSION_RANGETRANS,
 108                 .sym_num        = SYM_NUM,
 109                 .ocon_num       = OCON_NUM,
 110         },
 111         {
 112                 .version        = POLICYDB_VERSION_POLCAP,
 113                 .sym_num        = SYM_NUM,
 114                 .ocon_num       = OCON_NUM,
 115         },
 116         {
 117                 .version        = POLICYDB_VERSION_PERMISSIVE,
 118                 .sym_num        = SYM_NUM,
 119                 .ocon_num       = OCON_NUM,
 120         },
 121         {
 122                 .version        = POLICYDB_VERSION_BOUNDARY,
 123                 .sym_num        = SYM_NUM,
 124                 .ocon_num       = OCON_NUM,
 125         },
 126 };
 127
 128 static struct policydb_compat_info *policydb_lookup_compat(int version)
 129 {
 130         int i;
 131         struct policydb_compat_info *info = NULL;
 132
 133         for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) {
 134                 if (policydb_compat[i].version == version) {
 135                         info = &policydb_compat[i];
 136                         break;
 137                 }
 138         }
 139         return info;
 140 }
 141
 142 /*
 143  * Initialize the role table.
 144  */
 145 static int roles_init(struct policydb *p)
 146 {
 147         char *key = NULL;
 148         int rc;
 149         struct role_datum *role;
 150
 151         role = kzalloc(sizeof(*role), GFP_KERNEL);
 152         if (!role) {
 153                 rc = -ENOMEM;
 154                 goto out;
 155         }
 156         role->value = ++p->p_roles.nprim;
 157         if (role->value != OBJECT_R_VAL) {
 158                 rc = -EINVAL;
 159                 goto out_free_role;
 160         }
 161         key = kmalloc(strlen(OBJECT_R)+1, GFP_KERNEL);
 162         if (!key) {
 163                 rc = -ENOMEM;
 164                 goto out_free_role;
 165         }
 166         strcpy(key, OBJECT_R);
 167         rc = hashtab_insert(p->p_roles.table, key, role);
 168         if (rc)
 169                 goto out_free_key;
 170 out:
 171         return rc;
 172
 173 out_free_key:
 174         kfree(key);
 175 out_free_role:
 176         kfree(role);
 177         goto out;
 178 }
 179
 180 static u32 rangetr_hash(struct hashtab *h, const void *k)
 181 {
 182         const struct range_trans *key = k;
 183         return (key->source_type + (key->target_type << 3) +
 184                 (key->target_class << 5)) & (h->size - 1);
 185 }
 186
 187 static int rangetr_cmp(struct hashtab *h, const void *k1, const void *k2)
 188 {
 189         const struct range_trans *key1 = k1, *key2 = k2;
 190         return (key1->source_type != key2->source_type ||
 191                 key1->target_type != key2->target_type ||
 192                 key1->target_class != key2->target_class);
 193 }
 194
 195 /*
 196  * Initialize a policy database structure.
 197  */
 198 static int policydb_init(struct policydb *p)
 199 {
 200         int i, rc;
 201
 202         memset(p, 0, sizeof(*p));
 203
 204         for (i = 0; i < SYM_NUM; i++) {
 205                 rc = symtab_init(&p->symtab[i], symtab_sizes[i]);
 206                 if (rc)
 207                         goto out_free_symtab;
 208         }
 209
 210         rc = avtab_init(&p->te_avtab);
 211         if (rc)
 212                 goto out_free_symtab;
 213
 214         rc = roles_init(p);
 215         if (rc)
 216                 goto out_free_symtab;
 217
 218         rc = cond_policydb_init(p);
 219         if (rc)
 220                 goto out_free_symtab;
 221
 222         p->range_tr = hashtab_create(rangetr_hash, rangetr_cmp, 256);
 223         if (!p->range_tr)
 224                 goto out_free_symtab;
 225
 226         ebitmap_init(&p->policycaps);
 227         ebitmap_init(&p->permissive_map);
 228
 229 out:
 230         return rc;
 231
 232 out_free_symtab:
 233         for (i = 0; i < SYM_NUM; i++)
 234                 hashtab_destroy(p->symtab[i].table);
 235         goto out;
 236 }
 237
 238 /*
 239  * The following *_index functions are used to
 240  * define the val_to_name and val_to_struct arrays
 241  * in a policy database structure.  The val_to_name
 242  * arrays are used when converting security context
 243  * structures into string representations.  The
 244  * val_to_struct arrays are used when the attributes
 245  * of a class, role, or user are needed.
 246  */
 247
 248 static int common_index(void *key, void *datum, void *datap)
 249 {
 250         struct policydb *p;
 251         struct common_datum *comdatum;
 252
 253         comdatum = datum;
 254         p = datap;
 255         if (!comdatum->value || comdatum->value > p->p_commons.nprim)
 256                 return -EINVAL;
 257         p->p_common_val_to_name[comdatum->value - 1] = key;
 258         return 0;
 259 }
 260
 261 static int class_index(void *key, void *datum, void *datap)
 262 {
 263         struct policydb *p;
 264         struct class_datum *cladatum;
 265
 266         cladatum = datum;
 267         p = datap;
 268         if (!cladatum->value || cladatum->value > p->p_classes.nprim)
 269                 return -EINVAL;
 270         p->p_class_val_to_name[cladatum->value - 1] = key;
 271         p->class_val_to_struct[cladatum->value - 1] = cladatum;
 272         return 0;
 273 }
 274
 275 static int role_index(void *key, void *datum, void *datap)
 276 {
 277         struct policydb *p;
 278         struct role_datum *role;
 279
 280         role = datum;
 281         p = datap;
 282         if (!role->value
 283             || role->value > p->p_roles.nprim
 284             || role->bounds > p->p_roles.nprim)
 285                 return -EINVAL;
 286         p->p_role_val_to_name[role->value - 1] = key;
 287         p->role_val_to_struct[role->value - 1] = role;
 288         return 0;
 289 }
 290
 291 static int type_index(void *key, void *datum, void *datap)
 292 {
 293         struct policydb *p;
 294         struct type_datum *typdatum;
 295
 296         typdatum = datum;
 297         p = datap;
 298
 299         if (typdatum->primary) {
 300                 if (!typdatum->value
 301                     || typdatum->value > p->p_types.nprim
 302                     || typdatum->bounds > p->p_types.nprim)
 303                         return -EINVAL;
 304                 p->p_type_val_to_name[typdatum->value - 1] = key;
 305                 p->type_val_to_struct[typdatum->value - 1] = typdatum;
 306         }
 307
 308         return 0;
 309 }
 310
 311 static int user_index(void *key, void *datum, void *datap)
 312 {
 313         struct policydb *p;
 314         struct user_datum *usrdatum;
 315
 316         usrdatum = datum;
 317         p = datap;
 318         if (!usrdatum->value
 319             || usrdatum->value > p->p_users.nprim
 320             || usrdatum->bounds > p->p_users.nprim)
 321                 return -EINVAL;
 322         p->p_user_val_to_name[usrdatum->value - 1] = key;
 323         p->user_val_to_struct[usrdatum->value - 1] = usrdatum;
 324         return 0;
 325 }
 326
 327 static int sens_index(void *key, void *datum, void *datap)
 328 {
 329         struct policydb *p;
 330         struct level_datum *levdatum;
 331
 332         levdatum = datum;
 333         p = datap;
 334
 335         if (!levdatum->isalias) {
 336                 if (!levdatum->level->sens ||
 337                     levdatum->level->sens > p->p_levels.nprim)
 338                         return -EINVAL;
 339                 p->p_sens_val_to_name[levdatum->level->sens - 1] = key;
 340         }
 341
 342         return 0;
 343 }
 344
 345 static int cat_index(void *key, void *datum, void *datap)
 346 {
 347         struct policydb *p;
 348         struct cat_datum *catdatum;
 349
 350         catdatum = datum;
 351         p = datap;
 352
 353         if (!catdatum->isalias) {
 354                 if (!catdatum->value || catdatum->value > p->p_cats.nprim)
 355                         return -EINVAL;
 356                 p->p_cat_val_to_name[catdatum->value - 1] = key;
 357         }
 358
 359         return 0;
 360 }
 361
 362 static int (*index_f[SYM_NUM]) (void *key, void *datum, void *datap) =
 363 {
 364         common_index,
 365         class_index,
 366         role_index,
 367         type_index,
 368         user_index,
 369         cond_index_bool,
 370         sens_index,
 371         cat_index,
 372 };
 373
 374 /*
 375  * Define the common val_to_name array and the class
 376  * val_to_name and val_to_struct arrays in a policy
 377  * database structure.
 378  *
 379  * Caller must clean up upon failure.
 380  */
 381 static int policydb_index_classes(struct policydb *p)
 382 {
 383         int rc;
 384
 385         p->p_common_val_to_name =
 386                 kmalloc(p->p_commons.nprim * sizeof(char *), GFP_KERNEL);
 387         if (!p->p_common_val_to_name) {
 388                 rc = -ENOMEM;
 389                 goto out;
 390         }
 391
 392         rc = hashtab_map(p->p_commons.table, common_index, p);
 393         if (rc)
 394                 goto out;
 395
 396         p->class_val_to_struct =
 397                 kmalloc(p->p_classes.nprim * sizeof(*(p->class_val_to_struct)), GFP_KERNEL);
 398         if (!p->class_val_to_struct) {
 399                 rc = -ENOMEM;
 400                 goto out;
 401         }
 402
 403         p->p_class_val_to_name =
 404                 kmalloc(p->p_classes.nprim * sizeof(char *), GFP_KERNEL);
 405         if (!p->p_class_val_to_name) {
 406                 rc = -ENOMEM;
 407                 goto out;
 408         }
 409
 410         rc = hashtab_map(p->p_classes.table, class_index, p);
 411 out:
 412         return rc;
 413 }
 414
 415 #ifdef DEBUG_HASHES
 416 static void symtab_hash_eval(struct symtab *s)
 417 {
 418         int i;
 419
 420         for (i = 0; i < SYM_NUM; i++) {
 421                 struct hashtab *h = s[i].table;
 422                 struct hashtab_info info;
 423
 424                 hashtab_stat(h, &info);
 425                 printk(KERN_DEBUG "SELinux: %s:  %d entries and %d/%d buckets used, "
 426                        "longest chain length %d\n", symtab_name[i], h->nel,
 427                        info.slots_used, h->size, info.max_chain_len);
 428         }
 429 }
 430
 431 static void rangetr_hash_eval(struct hashtab *h)
 432 {
 433         struct hashtab_info info;
 434
 435         hashtab_stat(h, &info);
 436         printk(KERN_DEBUG "SELinux: rangetr:  %d entries and %d/%d buckets used, "
 437                "longest chain length %d\n", h->nel,
 438                info.slots_used, h->size, info.max_chain_len);
 439 }
 440 #else
 441 static inline void rangetr_hash_eval(struct hashtab *h)
 442 {
 443 }
 444 #endif
 445
 446 /*
 447  * Define the other val_to_name and val_to_struct arrays
 448  * in a policy database structure.
 449  *
 450  * Caller must clean up on failure.
 451  */
 452 static int policydb_index_others(struct policydb *p)
 453 {
 454         int i, rc = 0;
 455
 456         printk(KERN_DEBUG "SELinux:  %d users, %d roles, %d types, %d bools",
 457                p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim, p->p_bools.nprim);
 458         if (selinux_mls_enabled)
 459                 printk(", %d sens, %d cats", p->p_levels.nprim,
 460                        p->p_cats.nprim);
 461         printk("\n");
 462
 463         printk(KERN_DEBUG "SELinux:  %d classes, %d rules\n",
 464                p->p_classes.nprim, p->te_avtab.nel);
 465
 466 #ifdef DEBUG_HASHES
 467         avtab_hash_eval(&p->te_avtab, "rules");
 468         symtab_hash_eval(p->symtab);
 469 #endif
 470
 471         p->role_val_to_struct =
 472                 kmalloc(p->p_roles.nprim * sizeof(*(p->role_val_to_struct)),
 473                         GFP_KERNEL);
 474         if (!p->role_val_to_struct) {
 475                 rc = -ENOMEM;
 476                 goto out;
 477         }
 478
 479         p->user_val_to_struct =
 480                 kmalloc(p->p_users.nprim * sizeof(*(p->user_val_to_struct)),
 481                         GFP_KERNEL);
 482         if (!p->user_val_to_struct) {
 483                 rc = -ENOMEM;
 484                 goto out;
 485         }
 486
 487         p->type_val_to_struct =
 488                 kmalloc(p->p_types.nprim * sizeof(*(p->type_val_to_struct)),
 489                         GFP_KERNEL);
 490         if (!p->type_val_to_struct) {
 491                 rc = -ENOMEM;
 492                 goto out;
 493         }
 494
 495         if (cond_init_bool_indexes(p)) {
 496                 rc = -ENOMEM;
 497                 goto out;
 498         }
 499
 500         for (i = SYM_ROLES; i < SYM_NUM; i++) {
 501                 p->sym_val_to_name[i] =
 502                         kmalloc(p->symtab[i].nprim * sizeof(char *), GFP_KERNEL);
 503                 if (!p->sym_val_to_name[i]) {
 504                         rc = -ENOMEM;
 505                         goto out;
 506                 }
 507                 rc = hashtab_map(p->symtab[i].table, index_f[i], p);
 508                 if (rc)
 509                         goto out;
 510         }
 511
 512 out:
 513         return rc;
 514 }
 515
 516 /*
 517  * The following *_destroy functions are used to
 518  * free any memory allocated for each kind of
 519  * symbol data in the policy database.
 520  */
 521
 522 static int perm_destroy(void *key, void *datum, void *p)
 523 {
 524         kfree(key);
 525         kfree(datum);
 526         return 0;
 527 }
 528
 529 static int common_destroy(void *key, void *datum, void *p)
 530 {
 531         struct common_datum *comdatum;
 532
 533         kfree(key);
 534         comdatum = datum;
 535         hashtab_map(comdatum->permissions.table, perm_destroy, NULL);
 536         hashtab_destroy(comdatum->permissions.table);
 537         kfree(datum);
 538         return 0;
 539 }
 540
 541 static int cls_destroy(void *key, void *datum, void *p)
 542 {
 543         struct class_datum *cladatum;
 544         struct constraint_node *constraint, *ctemp;
 545         struct constraint_expr *e, *etmp;
 546
 547         kfree(key);
 548         cladatum = datum;
 549         hashtab_map(cladatum->permissions.table, perm_destroy, NULL);
 550         hashtab_destroy(cladatum->permissions.table);
 551         constraint = cladatum->constraints;
 552         while (constraint) {
 553                 e = constraint->expr;
 554                 while (e) {
 555                         ebitmap_destroy(&e->names);
 556                         etmp = e;
 557                         e = e->next;
 558                         kfree(etmp);
 559                 }
 560                 ctemp = constraint;
 561                 constraint = constraint->next;
 562                 kfree(ctemp);
 563         }
 564
 565         constraint = cladatum->validatetrans;
 566         while (constraint) {
 567                 e = constraint->expr;
 568                 while (e) {
 569                         ebitmap_destroy(&e->names);
 570                         etmp = e;
 571                         e = e->next;
 572                         kfree(etmp);
 573                 }
 574                 ctemp = constraint;
 575                 constraint = constraint->next;
 576                 kfree(ctemp);
 577         }
 578
 579         kfree(cladatum->comkey);
 580         kfree(datum);
 581         return 0;
 582 }
 583
 584 static int role_destroy(void *key, void *datum, void *p)
 585 {
 586         struct role_datum *role;
 587
 588         kfree(key);
 589         role = datum;
 590         ebitmap_destroy(&role->dominates);
 591         ebitmap_destroy(&role->types);
 592         kfree(datum);
 593         return 0;
 594 }
 595
 596 static int type_destroy(void *key, void *datum, void *p)
 597 {
 598         kfree(key);
 599         kfree(datum);
 600         return 0;
 601 }
 602
 603 static int user_destroy(void *key, void *datum, void *p)
 604 {
 605         struct user_datum *usrdatum;
 606
 607         kfree(key);
 608         usrdatum = datum;
 609         ebitmap_destroy(&usrdatum->roles);
 610         ebitmap_destroy(&usrdatum->range.level[0].cat);
 611         ebitmap_destroy(&usrdatum->range.level[1].cat);
 612         ebitmap_destroy(&usrdatum->dfltlevel.cat);
 613         kfree(datum);
 614         return 0;
 615 }
 616
 617 static int sens_destroy(void *key, void *datum, void *p)
 618 {
 619         struct level_datum *levdatum;
 620
 621         kfree(key);
 622         levdatum = datum;
 623         ebitmap_destroy(&levdatum->level->cat);
 624         kfree(levdatum->level);
 625         kfree(datum);
 626         return 0;
 627 }
 628
 629 static int cat_destroy(void *key, void *datum, void *p)
 630 {
 631         kfree(key);
 632         kfree(datum);
 633         return 0;
 634 }
 635
 636 static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) =
 637 {
 638         common_destroy,
 639         cls_destroy,
 640         role_destroy,
 641         type_destroy,
 642         user_destroy,
 643         cond_destroy_bool,
 644         sens_destroy,
 645         cat_destroy,
 646 };
 647
 648 static int range_tr_destroy(void *key, void *datum, void *p)
 649 {
 650         struct mls_range *rt = datum;
 651         kfree(key);
 652         ebitmap_destroy(&rt->level[0].cat);
 653         ebitmap_destroy(&rt->level[1].cat);
 654         kfree(datum);
 655         cond_resched();
 656         return 0;
 657 }
 658
 659 static void ocontext_destroy(struct ocontext *c, int i)
 660 {
 661         context_destroy(&c->context[0]);
 662         context_destroy(&c->context[1]);
 663         if (i == OCON_ISID || i == OCON_FS ||
 664             i == OCON_NETIF || i == OCON_FSUSE)
 665                 kfree(c->u.name);
 666         kfree(c);
 667 }
 668
 669 /*
 670  * Free any memory allocated by a policy database structure.
 671  */
 672 void policydb_destroy(struct policydb *p)
 673 {
 674         struct ocontext *c, *ctmp;
 675         struct genfs *g, *gtmp;
 676         int i;
 677         struct role_allow *ra, *lra = NULL;
 678         struct role_trans *tr, *ltr = NULL;
 679
 680         for (i = 0; i < SYM_NUM; i++) {
 681                 cond_resched();
 682                 hashtab_map(p->symtab[i].table, destroy_f[i], NULL);
 683                 hashtab_destroy(p->symtab[i].table);
 684         }
 685
 686         for (i = 0; i < SYM_NUM; i++)
 687                 kfree(p->sym_val_to_name[i]);
 688
 689         kfree(p->class_val_to_struct);
 690         kfree(p->role_val_to_struct);
 691         kfree(p->user_val_to_struct);
 692         kfree(p->type_val_to_struct);
 693
 694         avtab_destroy(&p->te_avtab);
 695
 696         for (i = 0; i < OCON_NUM; i++) {
 697                 cond_resched();
 698                 c = p->ocontexts[i];
 699                 while (c) {
 700                         ctmp = c;
 701                         c = c->next;
 702                         ocontext_destroy(ctmp, i);
 703                 }
 704                 p->ocontexts[i] = NULL;
 705         }
 706
 707         g = p->genfs;
 708         while (g) {
 709                 cond_resched();
 710                 kfree(g->fstype);
 711                 c = g->head;
 712                 while (c) {
 713                         ctmp = c;
 714                         c = c->next;
 715                         ocontext_destroy(ctmp, OCON_FSUSE);
 716                 }
 717                 gtmp = g;
 718                 g = g->next;
 719                 kfree(gtmp);
 720         }
 721         p->genfs = NULL;
 722
 723         cond_policydb_destroy(p);
 724
 725         for (tr = p->role_tr; tr; tr = tr->next) {
 726                 cond_resched();
 727                 kfree(ltr);
 728                 ltr = tr;
 729         }
 730         kfree(ltr);
 731
 732         for (ra = p->role_allow; ra; ra = ra->next) {
 733                 cond_resched();
 734                 kfree(lra);
 735                 lra = ra;
 736         }
 737         kfree(lra);
 738
 739         hashtab_map(p->range_tr, range_tr_destroy, NULL);
 740         hashtab_destroy(p->range_tr);
 741
 742         if (p->type_attr_map) {
 743                 for (i = 0; i < p->p_types.nprim; i++)
 744                         ebitmap_destroy(&p->type_attr_map[i]);
 745         }
 746         kfree(p->type_attr_map);
 747         ebitmap_destroy(&p->policycaps);
 748         ebitmap_destroy(&p->permissive_map);
 749
 750         return;
 751 }
 752
 753 /*
 754  * Load the initial SIDs specified in a policy database
 755  * structure into a SID table.
 756  */
 757 int policydb_load_isids(struct policydb *p, struct sidtab *s)
 758 {
 759         struct ocontext *head, *c;
 760         int rc;
 761
 762         rc = sidtab_init(s);
 763         if (rc) {
 764                 printk(KERN_ERR "SELinux:  out of memory on SID table init\n");
 765                 goto out;
 766         }
 767
 768         head = p->ocontexts[OCON_ISID];
 769         for (c = head; c; c = c->next) {
 770                 if (!c->context[0].user) {
 771                         printk(KERN_ERR "SELinux:  SID %s was never "
 772                                "defined.\n", c->u.name);
 773                         rc = -EINVAL;
 774                         goto out;
 775                 }
 776                 if (sidtab_insert(s, c->sid[0], &c->context[0])) {
 777                         printk(KERN_ERR "SELinux:  unable to load initial "
 778                                "SID %s.\n", c->u.name);
 779                         rc = -EINVAL;
 780                         goto out;
 781                 }
 782         }
 783 out:
 784         return rc;
 785 }
 786
 787 int policydb_class_isvalid(struct policydb *p, unsigned int class)
 788 {
 789         if (!class || class > p->p_classes.nprim)
 790                 return 0;
 791         return 1;
 792 }
 793
 794 int policydb_role_isvalid(struct policydb *p, unsigned int role)
 795 {
 796         if (!role || role > p->p_roles.nprim)
 797                 return 0;
 798         return 1;
 799 }
 800
 801 int policydb_type_isvalid(struct policydb *p, unsigned int type)
 802 {
 803         if (!type || type > p->p_types.nprim)
 804                 return 0;
 805         return 1;
 806 }
 807
 808 /*
 809  * Return 1 if the fields in the security context
 810  * structure `c' are valid.  Return 0 otherwise.
 811  */
 812 int policydb_context_isvalid(struct policydb *p, struct context *c)
 813 {
 814         struct role_datum *role;
 815         struct user_datum *usrdatum;
 816
 817         if (!c->role || c->role > p->p_roles.nprim)
 818                 return 0;
 819
 820         if (!c->user || c->user > p->p_users.nprim)
 821                 return 0;
 822
 823         if (!c->type || c->type > p->p_types.nprim)
 824                 return 0;
 825
 826         if (c->role != OBJECT_R_VAL) {
 827                 /*
 828                  * Role must be authorized for the type.
 829                  */
 830                 role = p->role_val_to_struct[c->role - 1];
 831                 if (!ebitmap_get_bit(&role->types,
 832                                      c->type - 1))
 833                         /* role may not be associated with type */
 834                         return 0;
 835
 836                 /*
 837                  * User must be authorized for the role.
 838                  */
 839                 usrdatum = p->user_val_to_struct[c->user - 1];
 840                 if (!usrdatum)
 841                         return 0;
 842
 843                 if (!ebitmap_get_bit(&usrdatum->roles,
 844                                      c->role - 1))
 845                         /* user may not be associated with role */
 846                         return 0;
 847         }
 848
 849         if (!mls_context_isvalid(p, c))
 850                 return 0;
 851
 852         return 1;
 853 }
 854
 855 /*
 856  * Read a MLS range structure from a policydb binary
 857  * representation file.
 858  */
 859 static int mls_read_range_helper(struct mls_range *r, void *fp)
 860 {
 861         __le32 buf[2];
 862         u32 items;
 863         int rc;
 864
 865         rc = next_entry(buf, fp, sizeof(u32));
 866         if (rc < 0)
 867                 goto out;
 868
 869         items = le32_to_cpu(buf[0]);
 870         if (items > ARRAY_SIZE(buf)) {
 871                 printk(KERN_ERR "SELinux: mls:  range overflow\n");
 872                 rc = -EINVAL;
 873                 goto out;
 874         }
 875         rc = next_entry(buf, fp, sizeof(u32) * items);
 876         if (rc < 0) {
 877                 printk(KERN_ERR "SELinux: mls:  truncated range\n");
 878                 goto out;
 879         }
 880         r->level[0].sens = le32_to_cpu(buf[0]);
 881         if (items > 1)
 882                 r->level[1].sens = le32_to_cpu(buf[1]);
 883         else
 884                 r->level[1].sens = r->level[0].sens;
 885
 886         rc = ebitmap_read(&r->level[0].cat, fp);
 887         if (rc) {
 888                 printk(KERN_ERR "SELinux: mls:  error reading low "
 889                        "categories\n");
 890                 goto out;
 891         }
 892         if (items > 1) {
 893                 rc = ebitmap_read(&r->level[1].cat, fp);
 894                 if (rc) {
 895                         printk(KERN_ERR "SELinux: mls:  error reading high "
 896                                "categories\n");
 897                         goto bad_high;
 898                 }
 899         } else {
 900                 rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat);
 901                 if (rc) {
 902                         printk(KERN_ERR "SELinux: mls:  out of memory\n");
 903                         goto bad_high;
 904                 }
 905         }
 906
 907         rc = 0;
 908 out:
 909         return rc;
 910 bad_high:
 911         ebitmap_destroy(&r->level[0].cat);
 912         goto out;
 913 }
 914
 915 /*
 916  * Read and validate a security context structure
 917  * from a policydb binary representation file.
 918  */
 919 static int context_read_and_validate(struct context *c,
 920                                      struct policydb *p,
 921                                      void *fp)
 922 {
 923         __le32 buf[3];
 924         int rc;
 925
 926         rc = next_entry(buf, fp, sizeof buf);
 927         if (rc < 0) {
 928                 printk(KERN_ERR "SELinux: context truncated\n");
 929                 goto out;
 930         }
 931         c->user = le32_to_cpu(buf[0]);
 932         c->role = le32_to_cpu(buf[1]);
 933         c->type = le32_to_cpu(buf[2]);
 934         if (p->policyvers >= POLICYDB_VERSION_MLS) {
 935                 if (mls_read_range_helper(&c->range, fp)) {
 936                         printk(KERN_ERR "SELinux: error reading MLS range of "
 937                                "context\n");
 938                         rc = -EINVAL;
 939                         goto out;
 940                 }
 941         }
 942
 943         if (!policydb_context_isvalid(p, c)) {
 944                 printk(KERN_ERR "SELinux:  invalid security context\n");
 945                 context_destroy(c);
 946                 rc = -EINVAL;
 947         }
 948 out:
 949         return rc;
 950 }
 951
 952 /*
 953  * The following *_read functions are used to
 954  * read the symbol data from a policy database
 955  * binary representation file.
 956  */
 957
 958 static int perm_read(struct policydb *p, struct hashtab *h, void *fp)
 959 {
 960         char *key = NULL;
 961         struct perm_datum *perdatum;
 962         int rc;
 963         __le32 buf[2];
 964         u32 len;
 965
 966         perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
 967         if (!perdatum) {
 968                 rc = -ENOMEM;
 969                 goto out;
 970         }
 971
 972         rc = next_entry(buf, fp, sizeof buf);
 973         if (rc < 0)
 974                 goto bad;
 975
 976         len = le32_to_cpu(buf[0]);
 977         perdatum->value = le32_to_cpu(buf[1]);
 978
 979         key = kmalloc(len + 1, GFP_KERNEL);
 980         if (!key) {
 981                 rc = -ENOMEM;
 982                 goto bad;
 983         }
 984         rc = next_entry(key, fp, len);
 985         if (rc < 0)
 986                 goto bad;
 987         key[len] = '\0';
 988
 989         rc = hashtab_insert(h, key, perdatum);
 990         if (rc)
 991                 goto bad;
 992 out:
 993         return rc;
 994 bad:
 995         perm_destroy(key, perdatum, NULL);
 996         goto out;
 997 }
 998
 999 static int common_read(struct policydb *p, struct hashtab *h, void *fp)
1000 {
1001         char *key = NULL;
1002         struct common_datum *comdatum;
1003         __le32 buf[4];
1004         u32 len, nel;
1005         int i, rc;
1006
1007         comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
1008         if (!comdatum) {
1009                 rc = -ENOMEM;
1010                 goto out;
1011         }
1012
1013         rc = next_entry(buf, fp, sizeof buf);
1014         if (rc < 0)
1015                 goto bad;
1016
1017         len = le32_to_cpu(buf[0]);
1018         comdatum->value = le32_to_cpu(buf[1]);
1019
1020         rc = symtab_init(&comdatum->permissions, PERM_SYMTAB_SIZE);
1021         if (rc)
1022                 goto bad;
1023         comdatum->permissions.nprim = le32_to_cpu(buf[2]);
1024         nel = le32_to_cpu(buf[3]);
1025
1026         key = kmalloc(len + 1, GFP_KERNEL);
1027         if (!key) {
1028                 rc = -ENOMEM;
1029                 goto bad;
1030         }
1031         rc = next_entry(key, fp, len);
1032         if (rc < 0)
1033                 goto bad;
1034         key[len] = '\0';
1035
1036         for (i = 0; i < nel; i++) {
1037                 rc = perm_read(p, comdatum->permissions.table, fp);
1038                 if (rc)
1039                         goto bad;
1040         }
1041
1042         rc = hashtab_insert(h, key, comdatum);
1043         if (rc)
1044                 goto bad;
1045 out:
1046         return rc;
1047 bad:
1048         common_destroy(key, comdatum, NULL);
1049         goto out;
1050 }
1051
1052 static int read_cons_helper(struct constraint_node **nodep, int ncons,
1053                             int allowxtarget, void *fp)
1054 {
1055         struct constraint_node *c, *lc;
1056         struct constraint_expr *e, *le;
1057         __le32 buf[3];
1058         u32 nexpr;
1059         int rc, i, j, depth;
1060
1061         lc = NULL;
1062         for (i = 0; i < ncons; i++) {
1063                 c = kzalloc(sizeof(*c), GFP_KERNEL);
1064                 if (!c)
1065                         return -ENOMEM;
1066
1067                 if (lc)
1068                         lc->next = c;
1069                 else
1070                         *nodep = c;
1071
1072                 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1073                 if (rc < 0)
1074                         return rc;
1075                 c->permissions = le32_to_cpu(buf[0]);
1076                 nexpr = le32_to_cpu(buf[1]);
1077                 le = NULL;
1078                 depth = -1;
1079                 for (j = 0; j < nexpr; j++) {
1080                         e = kzalloc(sizeof(*e), GFP_KERNEL);
1081                         if (!e)
1082                                 return -ENOMEM;
1083
1084                         if (le)
1085                                 le->next = e;
1086                         else
1087                                 c->expr = e;
1088
1089                         rc = next_entry(buf, fp, (sizeof(u32) * 3));
1090                         if (rc < 0)
1091                                 return rc;
1092                         e->expr_type = le32_to_cpu(buf[0]);
1093                         e->attr = le32_to_cpu(buf[1]);
1094                         e->op = le32_to_cpu(buf[2]);
1095
1096                         switch (e->expr_type) {
1097                         case CEXPR_NOT:
1098                                 if (depth < 0)
1099                                         return -EINVAL;
1100                                 break;
1101                         case CEXPR_AND:
1102                         case CEXPR_OR:
1103                                 if (depth < 1)
1104                                         return -EINVAL;
1105                                 depth--;
1106                                 break;
1107                         case CEXPR_ATTR:
1108                                 if (depth == (CEXPR_MAXDEPTH - 1))
1109                                         return -EINVAL;
1110                                 depth++;
1111                                 break;
1112                         case CEXPR_NAMES:
1113                                 if (!allowxtarget && (e->attr & CEXPR_XTARGET))
1114                                         return -EINVAL;
1115                                 if (depth == (CEXPR_MAXDEPTH - 1))
1116                                         return -EINVAL;
1117                                 depth++;
1118                                 if (ebitmap_read(&e->names, fp))
1119                                         return -EINVAL;
1120                                 break;
1121                         default:
1122                                 return -EINVAL;
1123                         }
1124                         le = e;
1125                 }
1126                 if (depth != 0)
1127                         return -EINVAL;
1128                 lc = c;
1129         }
1130
1131         return 0;
1132 }
1133
1134 static int class_read(struct policydb *p, struct hashtab *h, void *fp)
1135 {
1136         char *key = NULL;
1137         struct class_datum *cladatum;
1138         __le32 buf[6];
1139         u32 len, len2, ncons, nel;
1140         int i, rc;
1141
1142         cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
1143         if (!cladatum) {
1144                 rc = -ENOMEM;
1145                 goto out;
1146         }
1147
1148         rc = next_entry(buf, fp, sizeof(u32)*6);
1149         if (rc < 0)
1150                 goto bad;
1151
1152         len = le32_to_cpu(buf[0]);
1153         len2 = le32_to_cpu(buf[1]);
1154         cladatum->value = le32_to_cpu(buf[2]);
1155
1156         rc = symtab_init(&cladatum->permissions, PERM_SYMTAB_SIZE);
1157         if (rc)
1158                 goto bad;
1159         cladatum->permissions.nprim = le32_to_cpu(buf[3]);
1160         nel = le32_to_cpu(buf[4]);
1161
1162         ncons = le32_to_cpu(buf[5]);
1163
1164         key = kmalloc(len + 1, GFP_KERNEL);
1165         if (!key) {
1166                 rc = -ENOMEM;
1167                 goto bad;
1168         }
1169         rc = next_entry(key, fp, len);
1170         if (rc < 0)
1171                 goto bad;
1172         key[len] = '\0';
1173
1174         if (len2) {
1175                 cladatum->comkey = kmalloc(len2 + 1, GFP_KERNEL);
1176                 if (!cladatum->comkey) {
1177                         rc = -ENOMEM;
1178                         goto bad;
1179                 }
1180                 rc = next_entry(cladatum->comkey, fp, len2);
1181                 if (rc < 0)
1182                         goto bad;
1183                 cladatum->comkey[len2] = '\0';
1184
1185                 cladatum->comdatum = hashtab_search(p->p_commons.table,
1186                                                     cladatum->comkey);
1187                 if (!cladatum->comdatum) {
1188                         printk(KERN_ERR "SELinux:  unknown common %s\n",
1189                                cladatum->comkey);
1190                         rc = -EINVAL;
1191                         goto bad;
1192                 }
1193         }
1194         for (i = 0; i < nel; i++) {
1195                 rc = perm_read(p, cladatum->permissions.table, fp);
1196                 if (rc)
1197                         goto bad;
1198         }
1199
1200         rc = read_cons_helper(&cladatum->constraints, ncons, 0, fp);
1201         if (rc)
1202                 goto bad;
1203
1204         if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
1205                 /* grab the validatetrans rules */
1206                 rc = next_entry(buf, fp, sizeof(u32));
1207                 if (rc < 0)
1208                         goto bad;
1209                 ncons = le32_to_cpu(buf[0]);
1210                 rc = read_cons_helper(&cladatum->validatetrans, ncons, 1, fp);
1211                 if (rc)
1212                         goto bad;
1213         }
1214
1215         rc = hashtab_insert(h, key, cladatum);
1216         if (rc)
1217                 goto bad;
1218
1219         rc = 0;
1220 out:
1221         return rc;
1222 bad:
1223         cls_destroy(key, cladatum, NULL);
1224         goto out;
1225 }
1226
1227 static int role_read(struct policydb *p, struct hashtab *h, void *fp)
1228 {
1229         char *key = NULL;
1230         struct role_datum *role;
1231         int rc, to_read = 2;
1232         __le32 buf[3];
1233         u32 len;
1234
1235         role = kzalloc(sizeof(*role), GFP_KERNEL);
1236         if (!role) {
1237                 rc = -ENOMEM;
1238                 goto out;
1239         }
1240
1241         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1242                 to_read = 3;
1243
1244         rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1245         if (rc < 0)
1246                 goto bad;
1247
1248         len = le32_to_cpu(buf[0]);
1249         role->value = le32_to_cpu(buf[1]);
1250         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1251                 role->bounds = le32_to_cpu(buf[2]);
1252
1253         key = kmalloc(len + 1, GFP_KERNEL);
1254         if (!key) {
1255                 rc = -ENOMEM;
1256                 goto bad;
1257         }
1258         rc = next_entry(key, fp, len);
1259         if (rc < 0)
1260                 goto bad;
1261         key[len] = '\0';
1262
1263         rc = ebitmap_read(&role->dominates, fp);
1264         if (rc)
1265                 goto bad;
1266
1267         rc = ebitmap_read(&role->types, fp);
1268         if (rc)
1269                 goto bad;
1270
1271         if (strcmp(key, OBJECT_R) == 0) {
1272                 if (role->value != OBJECT_R_VAL) {
1273                         printk(KERN_ERR "SELinux: Role %s has wrong value %d\n",
1274                                OBJECT_R, role->value);
1275                         rc = -EINVAL;
1276                         goto bad;
1277                 }
1278                 rc = 0;
1279                 goto bad;
1280         }
1281
1282         rc = hashtab_insert(h, key, role);
1283         if (rc)
1284                 goto bad;
1285 out:
1286         return rc;
1287 bad:
1288         role_destroy(key, role, NULL);
1289         goto out;
1290 }
1291
1292 static int type_read(struct policydb *p, struct hashtab *h, void *fp)
1293 {
1294         char *key = NULL;
1295         struct type_datum *typdatum;
1296         int rc, to_read = 3;
1297         __le32 buf[4];
1298         u32 len;
1299
1300         typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL);
1301         if (!typdatum) {
1302                 rc = -ENOMEM;
1303                 return rc;
1304         }
1305
1306         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1307                 to_read = 4;
1308
1309         rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1310         if (rc < 0)
1311                 goto bad;
1312
1313         len = le32_to_cpu(buf[0]);
1314         typdatum->value = le32_to_cpu(buf[1]);
1315         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
1316                 u32 prop = le32_to_cpu(buf[2]);
1317
1318                 if (prop & TYPEDATUM_PROPERTY_PRIMARY)
1319                         typdatum->primary = 1;
1320                 if (prop & TYPEDATUM_PROPERTY_ATTRIBUTE)
1321                         typdatum->attribute = 1;
1322
1323                 typdatum->bounds = le32_to_cpu(buf[3]);
1324         } else {
1325                 typdatum->primary = le32_to_cpu(buf[2]);
1326         }
1327
1328         key = kmalloc(len + 1, GFP_KERNEL);
1329         if (!key) {
1330                 rc = -ENOMEM;
1331                 goto bad;
1332         }
1333         rc = next_entry(key, fp, len);
1334         if (rc < 0)
1335                 goto bad;
1336         key[len] = '\0';
1337
1338         rc = hashtab_insert(h, key, typdatum);
1339         if (rc)
1340                 goto bad;
1341 out:
1342         return rc;
1343 bad:
1344         type_destroy(key, typdatum, NULL);
1345         goto out;
1346 }
1347
1348
1349 /*
1350  * Read a MLS level structure from a policydb binary
1351  * representation file.
1352  */
1353 static int mls_read_level(struct mls_level *lp, void *fp)
1354 {
1355         __le32 buf[1];
1356         int rc;
1357
1358         memset(lp, 0, sizeof(*lp));
1359
1360         rc = next_entry(buf, fp, sizeof buf);
1361         if (rc < 0) {
1362                 printk(KERN_ERR "SELinux: mls: truncated level\n");
1363                 goto bad;
1364         }
1365         lp->sens = le32_to_cpu(buf[0]);
1366
1367         if (ebitmap_read(&lp->cat, fp)) {
1368                 printk(KERN_ERR "SELinux: mls:  error reading level "
1369                        "categories\n");
1370                 goto bad;
1371         }
1372
1373         return 0;
1374
1375 bad:
1376         return -EINVAL;
1377 }
1378
1379 static int user_read(struct policydb *p, struct hashtab *h, void *fp)
1380 {
1381         char *key = NULL;
1382         struct user_datum *usrdatum;
1383         int rc, to_read = 2;
1384         __le32 buf[3];
1385         u32 len;
1386
1387         usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
1388         if (!usrdatum) {
1389                 rc = -ENOMEM;
1390                 goto out;
1391         }
1392
1393         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1394                 to_read = 3;
1395
1396         rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1397         if (rc < 0)
1398                 goto bad;
1399
1400         len = le32_to_cpu(buf[0]);
1401         usrdatum->value = le32_to_cpu(buf[1]);
1402         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1403                 usrdatum->bounds = le32_to_cpu(buf[2]);
1404
1405         key = kmalloc(len + 1, GFP_KERNEL);
1406         if (!key) {
1407                 rc = -ENOMEM;
1408                 goto bad;
1409         }
1410         rc = next_entry(key, fp, len);
1411         if (rc < 0)
1412                 goto bad;
1413         key[len] = '\0';
1414
1415         rc = ebitmap_read(&usrdatum->roles, fp);
1416         if (rc)
1417                 goto bad;
1418
1419         if (p->policyvers >= POLICYDB_VERSION_MLS) {
1420                 rc = mls_read_range_helper(&usrdatum->range, fp);
1421                 if (rc)
1422                         goto bad;
1423                 rc = mls_read_level(&usrdatum->dfltlevel, fp);
1424                 if (rc)
1425                         goto bad;
1426         }
1427
1428         rc = hashtab_insert(h, key, usrdatum);
1429         if (rc)
1430                 goto bad;
1431 out:
1432         return rc;
1433 bad:
1434         user_destroy(key, usrdatum, NULL);
1435         goto out;
1436 }
1437
1438 static int sens_read(struct policydb *p, struct hashtab *h, void *fp)
1439 {
1440         char *key = NULL;
1441         struct level_datum *levdatum;
1442         int rc;
1443         __le32 buf[2];
1444         u32 len;
1445
1446         levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC);
1447         if (!levdatum) {
1448                 rc = -ENOMEM;
1449                 goto out;
1450         }
1451
1452         rc = next_entry(buf, fp, sizeof buf);
1453         if (rc < 0)
1454                 goto bad;
1455
1456         len = le32_to_cpu(buf[0]);
1457         levdatum->isalias = le32_to_cpu(buf[1]);
1458
1459         key = kmalloc(len + 1, GFP_ATOMIC);
1460         if (!key) {
1461                 rc = -ENOMEM;
1462                 goto bad;
1463         }
1464         rc = next_entry(key, fp, len);
1465         if (rc < 0)
1466                 goto bad;
1467         key[len] = '\0';
1468
1469         levdatum->level = kmalloc(sizeof(struct mls_level), GFP_ATOMIC);
1470         if (!levdatum->level) {
1471                 rc = -ENOMEM;
1472                 goto bad;
1473         }
1474         if (mls_read_level(levdatum->level, fp)) {
1475                 rc = -EINVAL;
1476                 goto bad;
1477         }
1478
1479         rc = hashtab_insert(h, key, levdatum);
1480         if (rc)
1481                 goto bad;
1482 out:
1483         return rc;
1484 bad:
1485         sens_destroy(key, levdatum, NULL);
1486         goto out;
1487 }
1488
1489 static int cat_read(struct policydb *p, struct hashtab *h, void *fp)
1490 {
1491         char *key = NULL;
1492         struct cat_datum *catdatum;
1493         int rc;
1494         __le32 buf[3];
1495         u32 len;
1496
1497         catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC);
1498         if (!catdatum) {
1499                 rc = -ENOMEM;
1500                 goto out;
1501         }
1502
1503         rc = next_entry(buf, fp, sizeof buf);
1504         if (rc < 0)
1505                 goto bad;
1506
1507         len = le32_to_cpu(buf[0]);
1508         catdatum->value = le32_to_cpu(buf[1]);
1509         catdatum->isalias = le32_to_cpu(buf[2]);
1510
1511         key = kmalloc(len + 1, GFP_ATOMIC);
1512         if (!key) {
1513                 rc = -ENOMEM;
1514                 goto bad;
1515         }
1516         rc = next_entry(key, fp, len);
1517         if (rc < 0)
1518                 goto bad;
1519         key[len] = '\0';
1520
1521         rc = hashtab_insert(h, key, catdatum);
1522         if (rc)
1523                 goto bad;
1524 out:
1525         return rc;
1526
1527 bad:
1528         cat_destroy(key, catdatum, NULL);
1529         goto out;
1530 }
1531
1532 static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, void *fp) =
1533 {
1534         common_read,
1535         class_read,
1536         role_read,
1537         type_read,
1538         user_read,
1539         cond_read_bool,
1540         sens_read,
1541         cat_read,
1542 };
1543
1544 static int user_bounds_sanity_check(void *key, void *datum, void *datap)
1545 {
1546         struct user_datum *upper, *user;
1547         struct policydb *p = datap;
1548         int depth = 0;
1549
1550         upper = user = datum;
1551         while (upper->bounds) {
1552                 struct ebitmap_node *node;
1553                 unsigned long bit;
1554
1555                 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1556                         printk(KERN_ERR "SELinux: user %s: "
1557                                "too deep or looped boundary",
1558                                (char *) key);
1559                         return -EINVAL;
1560                 }
1561
1562                 upper = p->user_val_to_struct[upper->bounds - 1];
1563                 ebitmap_for_each_positive_bit(&user->roles, node, bit) {
1564                         if (ebitmap_get_bit(&upper->roles, bit))
1565                                 continue;
1566
1567                         printk(KERN_ERR
1568                                "SELinux: boundary violated policy: "
1569                                "user=%s role=%s bounds=%s\n",
1570                                p->p_user_val_to_name[user->value - 1],
1571                                p->p_role_val_to_name[bit],
1572                                p->p_user_val_to_name[upper->value - 1]);
1573
1574                         return -EINVAL;
1575                 }
1576         }
1577
1578         return 0;
1579 }
1580
1581 static int role_bounds_sanity_check(void *key, void *datum, void *datap)
1582 {
1583         struct role_datum *upper, *role;
1584         struct policydb *p = datap;
1585         int depth = 0;
1586
1587         upper = role = datum;
1588         while (upper->bounds) {
1589                 struct ebitmap_node *node;
1590                 unsigned long bit;
1591
1592                 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1593                         printk(KERN_ERR "SELinux: role %s: "
1594                                "too deep or looped bounds\n",
1595                                (char *) key);
1596                         return -EINVAL;
1597                 }
1598
1599                 upper = p->role_val_to_struct[upper->bounds - 1];
1600                 ebitmap_for_each_positive_bit(&role->types, node, bit) {
1601                         if (ebitmap_get_bit(&upper->types, bit))
1602                                 continue;
1603
1604                         printk(KERN_ERR
1605                                "SELinux: boundary violated policy: "
1606                                "role=%s type=%s bounds=%s\n",
1607                                p->p_role_val_to_name[role->value - 1],
1608                                p->p_type_val_to_name[bit],
1609                                p->p_role_val_to_name[upper->value - 1]);
1610
1611                         return -EINVAL;
1612                 }
1613         }
1614
1615         return 0;
1616 }
1617
1618 static int type_bounds_sanity_check(void *key, void *datum, void *datap)
1619 {
1620         struct type_datum *upper, *type;
1621         struct policydb *p = datap;
1622         int depth = 0;
1623
1624         upper = type = datum;
1625         while (upper->bounds) {
1626                 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1627                         printk(KERN_ERR "SELinux: type %s: "
1628                                "too deep or looped boundary\n",
1629                                (char *) key);
1630                         return -EINVAL;
1631                 }
1632
1633                 upper = p->type_val_to_struct[upper->bounds - 1];
1634                 if (upper->attribute) {
1635                         printk(KERN_ERR "SELinux: type %s: "
1636                                "bounded by attribute %s",
1637                                (char *) key,
1638                                p->p_type_val_to_name[upper->value - 1]);
1639                         return -EINVAL;
1640                 }
1641         }
1642
1643         return 0;
1644 }
1645
1646 static int policydb_bounds_sanity_check(struct policydb *p)
1647 {
1648         int rc;
1649
1650         if (p->policyvers < POLICYDB_VERSION_BOUNDARY)
1651                 return 0;
1652
1653         rc = hashtab_map(p->p_users.table,
1654                          user_bounds_sanity_check, p);
1655         if (rc)
1656                 return rc;
1657
1658         rc = hashtab_map(p->p_roles.table,
1659                          role_bounds_sanity_check, p);
1660         if (rc)
1661                 return rc;
1662
1663         rc = hashtab_map(p->p_types.table,
1664                          type_bounds_sanity_check, p);
1665         if (rc)
1666                 return rc;
1667
1668         return 0;
1669 }
1670
1671 extern int ss_initialized;
1672
1673 u16 string_to_security_class(struct policydb *p, const char *name)
1674 {
1675         struct class_datum *cladatum;
1676
1677         cladatum = hashtab_search(p->p_classes.table, name);
1678         if (!cladatum)
1679                 return 0;
1680
1681         return cladatum->value;
1682 }
1683
1684 u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name)
1685 {
1686         struct class_datum *cladatum;
1687         struct perm_datum *perdatum = NULL;
1688         struct common_datum *comdatum;
1689
1690         if (!tclass || tclass > p->p_classes.nprim)
1691                 return 0;
1692
1693         cladatum = p->class_val_to_struct[tclass-1];
1694         comdatum = cladatum->comdatum;
1695         if (comdatum)
1696                 perdatum = hashtab_search(comdatum->permissions.table,
1697                                           name);
1698         if (!perdatum)
1699                 perdatum = hashtab_search(cladatum->permissions.table,
1700                                           name);
1701         if (!perdatum)
1702                 return 0;
1703
1704         return 1U << (perdatum->value-1);
1705 }
1706
1707 /*
1708  * Read the configuration data from a policy database binary
1709  * representation file into a policy database structure.
1710  */
1711 int policydb_read(struct policydb *p, void *fp)
1712 {
1713         struct role_allow *ra, *lra;
1714         struct role_trans *tr, *ltr;
1715         struct ocontext *l, *c, *newc;
1716         struct genfs *genfs_p, *genfs, *newgenfs;
1717         int i, j, rc;
1718         __le32 buf[4];
1719         u32 nodebuf[8];
1720         u32 len, len2, config, nprim, nel, nel2;
1721         char *policydb_str;
1722         struct policydb_compat_info *info;
1723         struct range_trans *rt;
1724         struct mls_range *r;
1725
1726         config = 0;
1727
1728         rc = policydb_init(p);
1729         if (rc)
1730                 goto out;
1731
1732         /* Read the magic number and string length. */
1733         rc = next_entry(buf, fp, sizeof(u32) * 2);
1734         if (rc < 0)
1735                 goto bad;
1736
1737         if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
1738                 printk(KERN_ERR "SELinux:  policydb magic number 0x%x does "
1739                        "not match expected magic number 0x%x\n",
1740                        le32_to_cpu(buf[0]), POLICYDB_MAGIC);
1741                 goto bad;
1742         }
1743
1744         len = le32_to_cpu(buf[1]);
1745         if (len != strlen(POLICYDB_STRING)) {
1746                 printk(KERN_ERR "SELinux:  policydb string length %d does not "
1747                        "match expected length %Zu\n",
1748                        len, strlen(POLICYDB_STRING));
1749                 goto bad;
1750         }
1751         policydb_str = kmalloc(len + 1, GFP_KERNEL);
1752         if (!policydb_str) {
1753                 printk(KERN_ERR "SELinux:  unable to allocate memory for policydb "
1754                        "string of length %d\n", len);
1755                 rc = -ENOMEM;
1756                 goto bad;
1757         }
1758         rc = next_entry(policydb_str, fp, len);
1759         if (rc < 0) {
1760                 printk(KERN_ERR "SELinux:  truncated policydb string identifier\n");
1761                 kfree(policydb_str);
1762                 goto bad;
1763         }
1764         policydb_str[len] = '\0';
1765         if (strcmp(policydb_str, POLICYDB_STRING)) {
1766                 printk(KERN_ERR "SELinux:  policydb string %s does not match "
1767                        "my string %s\n", policydb_str, POLICYDB_STRING);
1768                 kfree(policydb_str);
1769                 goto bad;
1770         }
1771         /* Done with policydb_str. */
1772         kfree(policydb_str);
1773         policydb_str = NULL;
1774
1775         /* Read the version, config, and table sizes. */
1776         rc = next_entry(buf, fp, sizeof(u32)*4);
1777         if (rc < 0)
1778                 goto bad;
1779
1780         p->policyvers = le32_to_cpu(buf[0]);
1781         if (p->policyvers < POLICYDB_VERSION_MIN ||
1782             p->policyvers > POLICYDB_VERSION_MAX) {
1783                 printk(KERN_ERR "SELinux:  policydb version %d does not match "
1784                        "my version range %d-%d\n",
1785                        le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
1786                 goto bad;
1787         }
1788
1789         if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
1790                 if (ss_initialized && !selinux_mls_enabled) {
1791                         printk(KERN_ERR "SELinux: Cannot switch between non-MLS"
1792                                 " and MLS policies\n");
1793                         goto bad;
1794                 }
1795                 selinux_mls_enabled = 1;
1796                 config |= POLICYDB_CONFIG_MLS;
1797
1798                 if (p->policyvers < POLICYDB_VERSION_MLS) {
1799                         printk(KERN_ERR "SELinux: security policydb version %d "
1800                                 "(MLS) not backwards compatible\n",
1801                                 p->policyvers);
1802                         goto bad;
1803                 }
1804         } else {
1805                 if (ss_initialized && selinux_mls_enabled) {
1806                         printk(KERN_ERR "SELinux: Cannot switch between MLS and"
1807                                 " non-MLS policies\n");
1808                         goto bad;
1809                 }
1810         }
1811         p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
1812         p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
1813
1814         if (p->policyvers >= POLICYDB_VERSION_POLCAP &&
1815             ebitmap_read(&p->policycaps, fp) != 0)
1816                 goto bad;
1817
1818         if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE &&
1819             ebitmap_read(&p->permissive_map, fp) != 0)
1820                 goto bad;
1821
1822         info = policydb_lookup_compat(p->policyvers);
1823         if (!info) {
1824                 printk(KERN_ERR "SELinux:  unable to find policy compat info "
1825                        "for version %d\n", p->policyvers);
1826                 goto bad;
1827         }
1828
1829         if (le32_to_cpu(buf[2]) != info->sym_num ||
1830                 le32_to_cpu(buf[3]) != info->ocon_num) {
1831                 printk(KERN_ERR "SELinux:  policydb table sizes (%d,%d) do "
1832                        "not match mine (%d,%d)\n", le32_to_cpu(buf[2]),
1833                         le32_to_cpu(buf[3]),
1834                        info->sym_num, info->ocon_num);
1835                 goto bad;
1836         }
1837
1838         for (i = 0; i < info->sym_num; i++) {
1839                 rc = next_entry(buf, fp, sizeof(u32)*2);
1840                 if (rc < 0)
1841                         goto bad;
1842                 nprim = le32_to_cpu(buf[0]);
1843                 nel = le32_to_cpu(buf[1]);
1844                 for (j = 0; j < nel; j++) {
1845                         rc = read_f[i](p, p->symtab[i].table, fp);
1846                         if (rc)
1847                                 goto bad;
1848                 }
1849
1850                 p->symtab[i].nprim = nprim;
1851         }
1852
1853         rc = avtab_read(&p->te_avtab, fp, p);
1854         if (rc)
1855                 goto bad;
1856
1857         if (p->policyvers >= POLICYDB_VERSION_BOOL) {
1858                 rc = cond_read_list(p, fp);
1859                 if (rc)
1860                         goto bad;
1861         }
1862
1863         rc = next_entry(buf, fp, sizeof(u32));
1864         if (rc < 0)
1865                 goto bad;
1866         nel = le32_to_cpu(buf[0]);
1867         ltr = NULL;
1868         for (i = 0; i < nel; i++) {
1869                 tr = kzalloc(sizeof(*tr), GFP_KERNEL);
1870                 if (!tr) {
1871                         rc = -ENOMEM;
1872                         goto bad;
1873                 }
1874                 if (ltr)
1875                         ltr->next = tr;
1876                 else
1877                         p->role_tr = tr;
1878                 rc = next_entry(buf, fp, sizeof(u32)*3);
1879                 if (rc < 0)
1880                         goto bad;
1881                 tr->role = le32_to_cpu(buf[0]);
1882                 tr->type = le32_to_cpu(buf[1]);
1883                 tr->new_role = le32_to_cpu(buf[2]);
1884                 if (!policydb_role_isvalid(p, tr->role) ||
1885                     !policydb_type_isvalid(p, tr->type) ||
1886                     !policydb_role_isvalid(p, tr->new_role)) {
1887                         rc = -EINVAL;
1888                         goto bad;
1889                 }
1890                 ltr = tr;
1891         }
1892
1893         rc = next_entry(buf, fp, sizeof(u32));
1894         if (rc < 0)
1895                 goto bad;
1896         nel = le32_to_cpu(buf[0]);
1897         lra = NULL;
1898         for (i = 0; i < nel; i++) {
1899                 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
1900                 if (!ra) {
1901                         rc = -ENOMEM;
1902                         goto bad;
1903                 }
1904                 if (lra)
1905                         lra->next = ra;
1906                 else
1907                         p->role_allow = ra;
1908                 rc = next_entry(buf, fp, sizeof(u32)*2);
1909                 if (rc < 0)
1910                         goto bad;
1911                 ra->role = le32_to_cpu(buf[0]);
1912                 ra->new_role = le32_to_cpu(buf[1]);
1913                 if (!policydb_role_isvalid(p, ra->role) ||
1914                     !policydb_role_isvalid(p, ra->new_role)) {
1915                         rc = -EINVAL;
1916                         goto bad;
1917                 }
1918                 lra = ra;
1919         }
1920
1921         rc = policydb_index_classes(p);
1922         if (rc)
1923                 goto bad;
1924
1925         rc = policydb_index_others(p);
1926         if (rc)
1927                 goto bad;
1928
1929         p->process_class = string_to_security_class(p, "process");
1930         if (!p->process_class)
1931                 goto bad;
1932         p->process_trans_perms = string_to_av_perm(p, p->process_class,
1933                                                    "transition");
1934         p->process_trans_perms |= string_to_av_perm(p, p->process_class,
1935                                                     "dyntransition");
1936         if (!p->process_trans_perms)
1937                 goto bad;
1938
1939         for (i = 0; i < info->ocon_num; i++) {
1940                 rc = next_entry(buf, fp, sizeof(u32));
1941                 if (rc < 0)
1942                         goto bad;
1943                 nel = le32_to_cpu(buf[0]);
1944                 l = NULL;
1945                 for (j = 0; j < nel; j++) {
1946                         c = kzalloc(sizeof(*c), GFP_KERNEL);
1947                         if (!c) {
1948                                 rc = -ENOMEM;
1949                                 goto bad;
1950                         }
1951                         if (l)
1952                                 l->next = c;
1953                         else
1954                                 p->ocontexts[i] = c;
1955                         l = c;
1956                         rc = -EINVAL;
1957                         switch (i) {
1958                         case OCON_ISID:
1959                                 rc = next_entry(buf, fp, sizeof(u32));
1960                                 if (rc < 0)
1961                                         goto bad;
1962                                 c->sid[0] = le32_to_cpu(buf[0]);
1963                                 rc = context_read_and_validate(&c->context[0], p, fp);
1964                                 if (rc)
1965                                         goto bad;
1966                                 break;
1967                         case OCON_FS:
1968                         case OCON_NETIF:
1969                                 rc = next_entry(buf, fp, sizeof(u32));
1970                                 if (rc < 0)
1971                                         goto bad;
1972                                 len = le32_to_cpu(buf[0]);
1973                                 c->u.name = kmalloc(len + 1, GFP_KERNEL);
1974                                 if (!c->u.name) {
1975                                         rc = -ENOMEM;
1976                                         goto bad;
1977                                 }
1978                                 rc = next_entry(c->u.name, fp, len);
1979                                 if (rc < 0)
1980                                         goto bad;
1981                                 c->u.name[len] = 0;
1982                                 rc = context_read_and_validate(&c->context[0], p, fp);
1983                                 if (rc)
1984                                         goto bad;
1985                                 rc = context_read_and_validate(&c->context[1], p, fp);
1986                                 if (rc)
1987                                         goto bad;
1988                                 break;
1989                         case OCON_PORT:
1990                                 rc = next_entry(buf, fp, sizeof(u32)*3);
1991                                 if (rc < 0)
1992                                         goto bad;
1993                                 c->u.port.protocol = le32_to_cpu(buf[0]);
1994                                 c->u.port.low_port = le32_to_cpu(buf[1]);
1995                                 c->u.port.high_port = le32_to_cpu(buf[2]);
1996                                 rc = context_read_and_validate(&c->context[0], p, fp);
1997                                 if (rc)
1998                                         goto bad;
1999                                 break;
2000                         case OCON_NODE:
2001                                 rc = next_entry(nodebuf, fp, sizeof(u32) * 2);
2002                                 if (rc < 0)
2003                                         goto bad;
2004                                 c->u.node.addr = nodebuf[0]; /* network order */
2005                                 c->u.node.mask = nodebuf[1]; /* network order */
2006                                 rc = context_read_and_validate(&c->context[0], p, fp);
2007                                 if (rc)
2008                                         goto bad;
2009                                 break;
2010                         case OCON_FSUSE:
2011                                 rc = next_entry(buf, fp, sizeof(u32)*2);
2012                                 if (rc < 0)
2013                                         goto bad;
2014                                 c->v.behavior = le32_to_cpu(buf[0]);
2015                                 if (c->v.behavior > SECURITY_FS_USE_NONE)
2016                                         goto bad;
2017                                 len = le32_to_cpu(buf[1]);
2018                                 c->u.name = kmalloc(len + 1, GFP_KERNEL);
2019                                 if (!c->u.name) {
2020                                         rc = -ENOMEM;
2021                                         goto bad;
2022                                 }
2023                                 rc = next_entry(c->u.name, fp, len);
2024                                 if (rc < 0)
2025                                         goto bad;
2026                                 c->u.name[len] = 0;
2027                                 rc = context_read_and_validate(&c->context[0], p, fp);
2028                                 if (rc)
2029                                         goto bad;
2030                                 break;
2031                         case OCON_NODE6: {
2032                                 int k;
2033
2034                                 rc = next_entry(nodebuf, fp, sizeof(u32) * 8);
2035                                 if (rc < 0)
2036                                         goto bad;
2037                                 for (k = 0; k < 4; k++)
2038                                         c->u.node6.addr[k] = nodebuf[k];
2039                                 for (k = 0; k < 4; k++)
2040                                         c->u.node6.mask[k] = nodebuf[k+4];
2041                                 if (context_read_and_validate(&c->context[0], p, fp))
2042                                         goto bad;
2043                                 break;
2044                         }
2045                         }
2046                 }
2047         }
2048
2049         rc = next_entry(buf, fp, sizeof(u32));
2050         if (rc < 0)
2051                 goto bad;
2052         nel = le32_to_cpu(buf[0]);
2053         genfs_p = NULL;
2054         rc = -EINVAL;
2055         for (i = 0; i < nel; i++) {
2056                 rc = next_entry(buf, fp, sizeof(u32));
2057                 if (rc < 0)
2058                         goto bad;
2059                 len = le32_to_cpu(buf[0]);
2060                 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
2061                 if (!newgenfs) {
2062                         rc = -ENOMEM;
2063                         goto bad;
2064                 }
2065
2066                 newgenfs->fstype = kmalloc(len + 1, GFP_KERNEL);
2067                 if (!newgenfs->fstype) {
2068                         rc = -ENOMEM;
2069                         kfree(newgenfs);
2070                         goto bad;
2071                 }
2072                 rc = next_entry(newgenfs->fstype, fp, len);
2073                 if (rc < 0) {
2074                         kfree(newgenfs->fstype);
2075                         kfree(newgenfs);
2076                         goto bad;
2077                 }
2078                 newgenfs->fstype[len] = 0;
2079                 for (genfs_p = NULL, genfs = p->genfs; genfs;
2080                      genfs_p = genfs, genfs = genfs->next) {
2081                         if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
2082                                 printk(KERN_ERR "SELinux:  dup genfs "
2083                                        "fstype %s\n", newgenfs->fstype);
2084                                 kfree(newgenfs->fstype);
2085                                 kfree(newgenfs);
2086                                 goto bad;
2087                         }
2088                         if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
2089                                 break;
2090                 }
2091                 newgenfs->next = genfs;
2092                 if (genfs_p)
2093                         genfs_p->next = newgenfs;
2094                 else
2095                         p->genfs = newgenfs;
2096                 rc = next_entry(buf, fp, sizeof(u32));
2097                 if (rc < 0)
2098                         goto bad;
2099                 nel2 = le32_to_cpu(buf[0]);
2100                 for (j = 0; j < nel2; j++) {
2101                         rc = next_entry(buf, fp, sizeof(u32));
2102                         if (rc < 0)
2103                                 goto bad;
2104                         len = le32_to_cpu(buf[0]);
2105
2106                         newc = kzalloc(sizeof(*newc), GFP_KERNEL);
2107                         if (!newc) {
2108                                 rc = -ENOMEM;
2109                                 goto bad;
2110                         }
2111
2112                         newc->u.name = kmalloc(len + 1, GFP_KERNEL);
2113                         if (!newc->u.name) {
2114                                 rc = -ENOMEM;
2115                                 goto bad_newc;
2116                         }
2117                         rc = next_entry(newc->u.name, fp, len);
2118                         if (rc < 0)
2119                                 goto bad_newc;
2120                         newc->u.name[len] = 0;
2121                         rc = next_entry(buf, fp, sizeof(u32));
2122                         if (rc < 0)
2123                                 goto bad_newc;
2124                         newc->v.sclass = le32_to_cpu(buf[0]);
2125                         if (context_read_and_validate(&newc->context[0], p, fp))
2126                                 goto bad_newc;
2127                         for (l = NULL, c = newgenfs->head; c;
2128                              l = c, c = c->next) {
2129                                 if (!strcmp(newc->u.name, c->u.name) &&
2130                                     (!c->v.sclass || !newc->v.sclass ||
2131                                      newc->v.sclass == c->v.sclass)) {
2132                                         printk(KERN_ERR "SELinux:  dup genfs "
2133                                                "entry (%s,%s)\n",
2134                                                newgenfs->fstype, c->u.name);
2135                                         goto bad_newc;
2136                                 }
2137                                 len = strlen(newc->u.name);
2138                                 len2 = strlen(c->u.name);
2139                                 if (len > len2)
2140                                         break;
2141                         }
2142
2143                         newc->next = c;
2144                         if (l)
2145                                 l->next = newc;
2146                         else
2147                                 newgenfs->head = newc;
2148                 }
2149         }
2150
2151         if (p->policyvers >= POLICYDB_VERSION_MLS) {
2152                 int new_rangetr = p->policyvers >= POLICYDB_VERSION_RANGETRANS;
2153                 rc = next_entry(buf, fp, sizeof(u32));
2154                 if (rc < 0)
2155                         goto bad;
2156                 nel = le32_to_cpu(buf[0]);
2157                 for (i = 0; i < nel; i++) {
2158                         rt = kzalloc(sizeof(*rt), GFP_KERNEL);
2159                         if (!rt) {
2160                                 rc = -ENOMEM;
2161                                 goto bad;
2162                         }
2163                         rc = next_entry(buf, fp, (sizeof(u32) * 2));
2164                         if (rc < 0) {
2165                                 kfree(rt);
2166                                 goto bad;
2167                         }
2168                         rt->source_type = le32_to_cpu(buf[0]);
2169                         rt->target_type = le32_to_cpu(buf[1]);
2170                         if (new_rangetr) {
2171                                 rc = next_entry(buf, fp, sizeof(u32));
2172                                 if (rc < 0) {
2173                                         kfree(rt);
2174                                         goto bad;
2175                                 }
2176                                 rt->target_class = le32_to_cpu(buf[0]);
2177                         } else
2178                                 rt->target_class = p->process_class;
2179                         if (!policydb_type_isvalid(p, rt->source_type) ||
2180                             !policydb_type_isvalid(p, rt->target_type) ||
2181                             !policydb_class_isvalid(p, rt->target_class)) {
2182                                 kfree(rt);
2183                                 rc = -EINVAL;
2184                                 goto bad;
2185                         }
2186                         r = kzalloc(sizeof(*r), GFP_KERNEL);
2187                         if (!r) {
2188                                 kfree(rt);
2189                                 rc = -ENOMEM;
2190                                 goto bad;
2191                         }
2192                         rc = mls_read_range_helper(r, fp);
2193                         if (rc) {
2194                                 kfree(rt);
2195                                 kfree(r);
2196                                 goto bad;
2197                         }
2198                         if (!mls_range_isvalid(p, r)) {
2199                                 printk(KERN_WARNING "SELinux:  rangetrans:  invalid range\n");
2200                                 kfree(rt);
2201                                 kfree(r);
2202                                 goto bad;
2203                         }
2204                         rc = hashtab_insert(p->range_tr, rt, r);
2205                         if (rc) {
2206                                 kfree(rt);
2207                                 kfree(r);
2208                                 goto bad;
2209                         }
2210                 }
2211                 rangetr_hash_eval(p->range_tr);
2212         }
2213
2214         p->type_attr_map = kmalloc(p->p_types.nprim*sizeof(struct ebitmap), GFP_KERNEL);
2215         if (!p->type_attr_map)
2216                 goto bad;
2217
2218         for (i = 0; i < p->p_types.nprim; i++) {
2219                 ebitmap_init(&p->type_attr_map[i]);
2220                 if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
2221                         if (ebitmap_read(&p->type_attr_map[i], fp))
2222                                 goto bad;
2223                 }
2224                 /* add the type itself as the degenerate case */
2225                 if (ebitmap_set_bit(&p->type_attr_map[i], i, 1))
2226                                 goto bad;
2227         }
2228
2229         rc = policydb_bounds_sanity_check(p);
2230         if (rc)
2231                 goto bad;
2232
2233         rc = 0;
2234 out:
2235         return rc;
2236 bad_newc:
2237         ocontext_destroy(newc, OCON_FSUSE);
2238 bad:
2239         if (!rc)
2240                 rc = -EINVAL;
2241         policydb_destroy(p);
2242         goto out;
2243 }