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