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

   1 /*
   2  * Implementation of the policy database.
   3  *
   4  * Author : Stephen Smalley, <sds@epoch.ncsc.mil>
   5  */
   6
   7 /*
   8  * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
   9  *
  10  *      Support for enhanced MLS infrastructure.
  11  *
  12  * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
  13  *
  14  *      Added conditional policy language extensions
  15  *
  16  * Updated: Hewlett-Packard <paul@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                 hashtab_insert(p->filename_trans, ft, otype);
1918         }
1919         hash_eval(p->filename_trans, "filenametr");
1920         return 0;
1921 out:
1922         kfree(ft);
1923         kfree(name);
1924         kfree(otype);
1925
1926         return rc;
1927 }
1928
1929 static int genfs_read(struct policydb *p, void *fp)
1930 {
1931         int i, j, rc;
1932         u32 nel, nel2, len, len2;
1933         __le32 buf[1];
1934         struct ocontext *l, *c;
1935         struct ocontext *newc = NULL;
1936         struct genfs *genfs_p, *genfs;
1937         struct genfs *newgenfs = NULL;
1938
1939         rc = next_entry(buf, fp, sizeof(u32));
1940         if (rc)
1941                 goto out;
1942         nel = le32_to_cpu(buf[0]);
1943
1944         for (i = 0; i < nel; i++) {
1945                 rc = next_entry(buf, fp, sizeof(u32));
1946                 if (rc)
1947                         goto out;
1948                 len = le32_to_cpu(buf[0]);
1949
1950                 rc = -ENOMEM;
1951                 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
1952                 if (!newgenfs)
1953                         goto out;
1954
1955                 rc = -ENOMEM;
1956                 newgenfs->fstype = kmalloc(len + 1, GFP_KERNEL);
1957                 if (!newgenfs->fstype)
1958                         goto out;
1959
1960                 rc = next_entry(newgenfs->fstype, fp, len);
1961                 if (rc)
1962                         goto out;
1963
1964                 newgenfs->fstype[len] = 0;
1965
1966                 for (genfs_p = NULL, genfs = p->genfs; genfs;
1967                      genfs_p = genfs, genfs = genfs->next) {
1968                         rc = -EINVAL;
1969                         if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
1970                                 printk(KERN_ERR "SELinux:  dup genfs fstype %s\n",
1971                                        newgenfs->fstype);
1972                                 goto out;
1973                         }
1974                         if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
1975                                 break;
1976                 }
1977                 newgenfs->next = genfs;
1978                 if (genfs_p)
1979                         genfs_p->next = newgenfs;
1980                 else
1981                         p->genfs = newgenfs;
1982                 genfs = newgenfs;
1983                 newgenfs = NULL;
1984
1985                 rc = next_entry(buf, fp, sizeof(u32));
1986                 if (rc)
1987                         goto out;
1988
1989                 nel2 = le32_to_cpu(buf[0]);
1990                 for (j = 0; j < nel2; j++) {
1991                         rc = next_entry(buf, fp, sizeof(u32));
1992                         if (rc)
1993                                 goto out;
1994                         len = le32_to_cpu(buf[0]);
1995
1996                         rc = -ENOMEM;
1997                         newc = kzalloc(sizeof(*newc), GFP_KERNEL);
1998                         if (!newc)
1999                                 goto out;
2000
2001                         rc = -ENOMEM;
2002                         newc->u.name = kmalloc(len + 1, GFP_KERNEL);
2003                         if (!newc->u.name)
2004                                 goto out;
2005
2006                         rc = next_entry(newc->u.name, fp, len);
2007                         if (rc)
2008                                 goto out;
2009                         newc->u.name[len] = 0;
2010
2011                         rc = next_entry(buf, fp, sizeof(u32));
2012                         if (rc)
2013                                 goto out;
2014
2015                         newc->v.sclass = le32_to_cpu(buf[0]);
2016                         rc = context_read_and_validate(&newc->context[0], p, fp);
2017                         if (rc)
2018                                 goto out;
2019
2020                         for (l = NULL, c = genfs->head; c;
2021                              l = c, c = c->next) {
2022                                 rc = -EINVAL;
2023                                 if (!strcmp(newc->u.name, c->u.name) &&
2024                                     (!c->v.sclass || !newc->v.sclass ||
2025                                      newc->v.sclass == c->v.sclass)) {
2026                                         printk(KERN_ERR "SELinux:  dup genfs entry (%s,%s)\n",
2027                                                genfs->fstype, c->u.name);
2028                                         goto out;
2029                                 }
2030                                 len = strlen(newc->u.name);
2031                                 len2 = strlen(c->u.name);
2032                                 if (len > len2)
2033                                         break;
2034                         }
2035
2036                         newc->next = c;
2037                         if (l)
2038                                 l->next = newc;
2039                         else
2040                                 genfs->head = newc;
2041                         newc = NULL;
2042                 }
2043         }
2044         rc = 0;
2045 out:
2046         if (newgenfs)
2047                 kfree(newgenfs->fstype);
2048         kfree(newgenfs);
2049         ocontext_destroy(newc, OCON_FSUSE);
2050
2051         return rc;
2052 }
2053
2054 static int ocontext_read(struct policydb *p, struct policydb_compat_info *info,
2055                          void *fp)
2056 {
2057         int i, j, rc;
2058         u32 nel, len;
2059         __le32 buf[3];
2060         struct ocontext *l, *c;
2061         u32 nodebuf[8];
2062
2063         for (i = 0; i < info->ocon_num; i++) {
2064                 rc = next_entry(buf, fp, sizeof(u32));
2065                 if (rc)
2066                         goto out;
2067                 nel = le32_to_cpu(buf[0]);
2068
2069                 l = NULL;
2070                 for (j = 0; j < nel; j++) {
2071                         rc = -ENOMEM;
2072                         c = kzalloc(sizeof(*c), GFP_KERNEL);
2073                         if (!c)
2074                                 goto out;
2075                         if (l)
2076                                 l->next = c;
2077                         else
2078                                 p->ocontexts[i] = c;
2079                         l = c;
2080
2081                         switch (i) {
2082                         case OCON_ISID:
2083                                 rc = next_entry(buf, fp, sizeof(u32));
2084                                 if (rc)
2085                                         goto out;
2086
2087                                 c->sid[0] = le32_to_cpu(buf[0]);
2088                                 rc = context_read_and_validate(&c->context[0], p, fp);
2089                                 if (rc)
2090                                         goto out;
2091                                 break;
2092                         case OCON_FS:
2093                         case OCON_NETIF:
2094                                 rc = next_entry(buf, fp, sizeof(u32));
2095                                 if (rc)
2096                                         goto out;
2097                                 len = le32_to_cpu(buf[0]);
2098
2099                                 rc = -ENOMEM;
2100                                 c->u.name = kmalloc(len + 1, GFP_KERNEL);
2101                                 if (!c->u.name)
2102                                         goto out;
2103
2104                                 rc = next_entry(c->u.name, fp, len);
2105                                 if (rc)
2106                                         goto out;
2107
2108                                 c->u.name[len] = 0;
2109                                 rc = context_read_and_validate(&c->context[0], p, fp);
2110                                 if (rc)
2111                                         goto out;
2112                                 rc = context_read_and_validate(&c->context[1], p, fp);
2113                                 if (rc)
2114                                         goto out;
2115                                 break;
2116                         case OCON_PORT:
2117                                 rc = next_entry(buf, fp, sizeof(u32)*3);
2118                                 if (rc)
2119                                         goto out;
2120                                 c->u.port.protocol = le32_to_cpu(buf[0]);
2121                                 c->u.port.low_port = le32_to_cpu(buf[1]);
2122                                 c->u.port.high_port = le32_to_cpu(buf[2]);
2123                                 rc = context_read_and_validate(&c->context[0], p, fp);
2124                                 if (rc)
2125                                         goto out;
2126                                 break;
2127                         case OCON_NODE:
2128                                 rc = next_entry(nodebuf, fp, sizeof(u32) * 2);
2129                                 if (rc)
2130                                         goto out;
2131                                 c->u.node.addr = nodebuf[0]; /* network order */
2132                                 c->u.node.mask = nodebuf[1]; /* network order */
2133                                 rc = context_read_and_validate(&c->context[0], p, fp);
2134                                 if (rc)
2135                                         goto out;
2136                                 break;
2137                         case OCON_FSUSE:
2138                                 rc = next_entry(buf, fp, sizeof(u32)*2);
2139                                 if (rc)
2140                                         goto out;
2141
2142                                 rc = -EINVAL;
2143                                 c->v.behavior = le32_to_cpu(buf[0]);
2144                                 if (c->v.behavior > SECURITY_FS_USE_NONE)
2145                                         goto out;
2146
2147                                 rc = -ENOMEM;
2148                                 len = le32_to_cpu(buf[1]);
2149                                 c->u.name = kmalloc(len + 1, GFP_KERNEL);
2150                                 if (!c->u.name)
2151                                         goto out;
2152
2153                                 rc = next_entry(c->u.name, fp, len);
2154                                 if (rc)
2155                                         goto out;
2156                                 c->u.name[len] = 0;
2157                                 rc = context_read_and_validate(&c->context[0], p, fp);
2158                                 if (rc)
2159                                         goto out;
2160                                 break;
2161                         case OCON_NODE6: {
2162                                 int k;
2163
2164                                 rc = next_entry(nodebuf, fp, sizeof(u32) * 8);
2165                                 if (rc)
2166                                         goto out;
2167                                 for (k = 0; k < 4; k++)
2168                                         c->u.node6.addr[k] = nodebuf[k];
2169                                 for (k = 0; k < 4; k++)
2170                                         c->u.node6.mask[k] = nodebuf[k+4];
2171                                 rc = context_read_and_validate(&c->context[0], p, fp);
2172                                 if (rc)
2173                                         goto out;
2174                                 break;
2175                         }
2176                         }
2177                 }
2178         }
2179         rc = 0;
2180 out:
2181         return rc;
2182 }
2183
2184 /*
2185  * Read the configuration data from a policy database binary
2186  * representation file into a policy database structure.
2187  */
2188 int policydb_read(struct policydb *p, void *fp)
2189 {
2190         struct role_allow *ra, *lra;
2191         struct role_trans *tr, *ltr;
2192         int i, j, rc;
2193         __le32 buf[4];
2194         u32 len, nprim, nel;
2195
2196         char *policydb_str;
2197         struct policydb_compat_info *info;
2198
2199         rc = policydb_init(p);
2200         if (rc)
2201                 return rc;
2202
2203         /* Read the magic number and string length. */
2204         rc = next_entry(buf, fp, sizeof(u32) * 2);
2205         if (rc)
2206                 goto bad;
2207
2208         rc = -EINVAL;
2209         if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
2210                 printk(KERN_ERR "SELinux:  policydb magic number 0x%x does "
2211                        "not match expected magic number 0x%x\n",
2212                        le32_to_cpu(buf[0]), POLICYDB_MAGIC);
2213                 goto bad;
2214         }
2215
2216         rc = -EINVAL;
2217         len = le32_to_cpu(buf[1]);
2218         if (len != strlen(POLICYDB_STRING)) {
2219                 printk(KERN_ERR "SELinux:  policydb string length %d does not "
2220                        "match expected length %Zu\n",
2221                        len, strlen(POLICYDB_STRING));
2222                 goto bad;
2223         }
2224
2225         rc = -ENOMEM;
2226         policydb_str = kmalloc(len + 1, GFP_KERNEL);
2227         if (!policydb_str) {
2228                 printk(KERN_ERR "SELinux:  unable to allocate memory for policydb "
2229                        "string of length %d\n", len);
2230                 goto bad;
2231         }
2232
2233         rc = next_entry(policydb_str, fp, len);
2234         if (rc) {
2235                 printk(KERN_ERR "SELinux:  truncated policydb string identifier\n");
2236                 kfree(policydb_str);
2237                 goto bad;
2238         }
2239
2240         rc = -EINVAL;
2241         policydb_str[len] = '\0';
2242         if (strcmp(policydb_str, POLICYDB_STRING)) {
2243                 printk(KERN_ERR "SELinux:  policydb string %s does not match "
2244                        "my string %s\n", policydb_str, POLICYDB_STRING);
2245                 kfree(policydb_str);
2246                 goto bad;
2247         }
2248         /* Done with policydb_str. */
2249         kfree(policydb_str);
2250         policydb_str = NULL;
2251
2252         /* Read the version and table sizes. */
2253         rc = next_entry(buf, fp, sizeof(u32)*4);
2254         if (rc)
2255                 goto bad;
2256
2257         rc = -EINVAL;
2258         p->policyvers = le32_to_cpu(buf[0]);
2259         if (p->policyvers < POLICYDB_VERSION_MIN ||
2260             p->policyvers > POLICYDB_VERSION_MAX) {
2261                 printk(KERN_ERR "SELinux:  policydb version %d does not match "
2262                        "my version range %d-%d\n",
2263                        le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
2264                 goto bad;
2265         }
2266
2267         if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
2268                 p->mls_enabled = 1;
2269
2270                 rc = -EINVAL;
2271                 if (p->policyvers < POLICYDB_VERSION_MLS) {
2272                         printk(KERN_ERR "SELinux: security policydb version %d "
2273                                 "(MLS) not backwards compatible\n",
2274                                 p->policyvers);
2275                         goto bad;
2276                 }
2277         }
2278         p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
2279         p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
2280
2281         if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
2282                 rc = ebitmap_read(&p->policycaps, fp);
2283                 if (rc)
2284                         goto bad;
2285         }
2286
2287         if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
2288                 rc = ebitmap_read(&p->permissive_map, fp);
2289                 if (rc)
2290                         goto bad;
2291         }
2292
2293         rc = -EINVAL;
2294         info = policydb_lookup_compat(p->policyvers);
2295         if (!info) {
2296                 printk(KERN_ERR "SELinux:  unable to find policy compat info "
2297                        "for version %d\n", p->policyvers);
2298                 goto bad;
2299         }
2300
2301         rc = -EINVAL;
2302         if (le32_to_cpu(buf[2]) != info->sym_num ||
2303                 le32_to_cpu(buf[3]) != info->ocon_num) {
2304                 printk(KERN_ERR "SELinux:  policydb table sizes (%d,%d) do "
2305                        "not match mine (%d,%d)\n", le32_to_cpu(buf[2]),
2306                         le32_to_cpu(buf[3]),
2307                        info->sym_num, info->ocon_num);
2308                 goto bad;
2309         }
2310
2311         for (i = 0; i < info->sym_num; i++) {
2312                 rc = next_entry(buf, fp, sizeof(u32)*2);
2313                 if (rc)
2314                         goto bad;
2315                 nprim = le32_to_cpu(buf[0]);
2316                 nel = le32_to_cpu(buf[1]);
2317                 for (j = 0; j < nel; j++) {
2318                         rc = read_f[i](p, p->symtab[i].table, fp);
2319                         if (rc)
2320                                 goto bad;
2321                 }
2322
2323                 p->symtab[i].nprim = nprim;
2324         }
2325
2326         rc = -EINVAL;
2327         p->process_class = string_to_security_class(p, "process");
2328         if (!p->process_class)
2329                 goto bad;
2330
2331         rc = avtab_read(&p->te_avtab, fp, p);
2332         if (rc)
2333                 goto bad;
2334
2335         if (p->policyvers >= POLICYDB_VERSION_BOOL) {
2336                 rc = cond_read_list(p, fp);
2337                 if (rc)
2338                         goto bad;
2339         }
2340
2341         rc = next_entry(buf, fp, sizeof(u32));
2342         if (rc)
2343                 goto bad;
2344         nel = le32_to_cpu(buf[0]);
2345         ltr = NULL;
2346         for (i = 0; i < nel; i++) {
2347                 rc = -ENOMEM;
2348                 tr = kzalloc(sizeof(*tr), GFP_KERNEL);
2349                 if (!tr)
2350                         goto bad;
2351                 if (ltr)
2352                         ltr->next = tr;
2353                 else
2354                         p->role_tr = tr;
2355                 rc = next_entry(buf, fp, sizeof(u32)*3);
2356                 if (rc)
2357                         goto bad;
2358
2359                 rc = -EINVAL;
2360                 tr->role = le32_to_cpu(buf[0]);
2361                 tr->type = le32_to_cpu(buf[1]);
2362                 tr->new_role = le32_to_cpu(buf[2]);
2363                 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2364                         rc = next_entry(buf, fp, sizeof(u32));
2365                         if (rc)
2366                                 goto bad;
2367                         tr->tclass = le32_to_cpu(buf[0]);
2368                 } else
2369                         tr->tclass = p->process_class;
2370
2371                 if (!policydb_role_isvalid(p, tr->role) ||
2372                     !policydb_type_isvalid(p, tr->type) ||
2373                     !policydb_class_isvalid(p, tr->tclass) ||
2374                     !policydb_role_isvalid(p, tr->new_role))
2375                         goto bad;
2376                 ltr = tr;
2377         }
2378
2379         rc = next_entry(buf, fp, sizeof(u32));
2380         if (rc)
2381                 goto bad;
2382         nel = le32_to_cpu(buf[0]);
2383         lra = NULL;
2384         for (i = 0; i < nel; i++) {
2385                 rc = -ENOMEM;
2386                 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
2387                 if (!ra)
2388                         goto bad;
2389                 if (lra)
2390                         lra->next = ra;
2391                 else
2392                         p->role_allow = ra;
2393                 rc = next_entry(buf, fp, sizeof(u32)*2);
2394                 if (rc)
2395                         goto bad;
2396
2397                 rc = -EINVAL;
2398                 ra->role = le32_to_cpu(buf[0]);
2399                 ra->new_role = le32_to_cpu(buf[1]);
2400                 if (!policydb_role_isvalid(p, ra->role) ||
2401                     !policydb_role_isvalid(p, ra->new_role))
2402                         goto bad;
2403                 lra = ra;
2404         }
2405
2406         rc = filename_trans_read(p, fp);
2407         if (rc)
2408                 goto bad;
2409
2410         rc = policydb_index(p);
2411         if (rc)
2412                 goto bad;
2413
2414         rc = -EINVAL;
2415         p->process_trans_perms = string_to_av_perm(p, p->process_class, "transition");
2416         p->process_trans_perms |= string_to_av_perm(p, p->process_class, "dyntransition");
2417         if (!p->process_trans_perms)
2418                 goto bad;
2419
2420         rc = ocontext_read(p, info, fp);
2421         if (rc)
2422                 goto bad;
2423
2424         rc = genfs_read(p, fp);
2425         if (rc)
2426                 goto bad;
2427
2428         rc = range_read(p, fp);
2429         if (rc)
2430                 goto bad;
2431
2432         rc = -ENOMEM;
2433         p->type_attr_map_array = flex_array_alloc(sizeof(struct ebitmap),
2434                                                   p->p_types.nprim,
2435                                                   GFP_KERNEL | __GFP_ZERO);
2436         if (!p->type_attr_map_array)
2437                 goto bad;
2438
2439         /* preallocate so we don't have to worry about the put ever failing */
2440         rc = flex_array_prealloc(p->type_attr_map_array, 0, p->p_types.nprim,
2441                                  GFP_KERNEL | __GFP_ZERO);
2442         if (rc)
2443                 goto bad;
2444
2445         for (i = 0; i < p->p_types.nprim; i++) {
2446                 struct ebitmap *e = flex_array_get(p->type_attr_map_array, i);
2447
2448                 BUG_ON(!e);
2449                 ebitmap_init(e);
2450                 if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
2451                         rc = ebitmap_read(e, fp);
2452                         if (rc)
2453                                 goto bad;
2454                 }
2455                 /* add the type itself as the degenerate case */
2456                 rc = ebitmap_set_bit(e, i, 1);
2457                 if (rc)
2458                         goto bad;
2459         }
2460
2461         rc = policydb_bounds_sanity_check(p);
2462         if (rc)
2463                 goto bad;
2464
2465         rc = 0;
2466 out:
2467         return rc;
2468 bad:
2469         policydb_destroy(p);
2470         goto out;
2471 }
2472
2473 /*
2474  * Write a MLS level structure to a policydb binary
2475  * representation file.
2476  */
2477 static int mls_write_level(struct mls_level *l, void *fp)
2478 {
2479         __le32 buf[1];
2480         int rc;
2481
2482         buf[0] = cpu_to_le32(l->sens);
2483         rc = put_entry(buf, sizeof(u32), 1, fp);
2484         if (rc)
2485                 return rc;
2486
2487         rc = ebitmap_write(&l->cat, fp);
2488         if (rc)
2489                 return rc;
2490
2491         return 0;
2492 }
2493
2494 /*
2495  * Write a MLS range structure to a policydb binary
2496  * representation file.
2497  */
2498 static int mls_write_range_helper(struct mls_range *r, void *fp)
2499 {
2500         __le32 buf[3];
2501         size_t items;
2502         int rc, eq;
2503
2504         eq = mls_level_eq(&r->level[1], &r->level[0]);
2505
2506         if (eq)
2507                 items = 2;
2508         else
2509                 items = 3;
2510         buf[0] = cpu_to_le32(items-1);
2511         buf[1] = cpu_to_le32(r->level[0].sens);
2512         if (!eq)
2513                 buf[2] = cpu_to_le32(r->level[1].sens);
2514
2515         BUG_ON(items > (sizeof(buf)/sizeof(buf[0])));
2516
2517         rc = put_entry(buf, sizeof(u32), items, fp);
2518         if (rc)
2519                 return rc;
2520
2521         rc = ebitmap_write(&r->level[0].cat, fp);
2522         if (rc)
2523                 return rc;
2524         if (!eq) {
2525                 rc = ebitmap_write(&r->level[1].cat, fp);
2526                 if (rc)
2527                         return rc;
2528         }
2529
2530         return 0;
2531 }
2532
2533 static int sens_write(void *vkey, void *datum, void *ptr)
2534 {
2535         char *key = vkey;
2536         struct level_datum *levdatum = datum;
2537         struct policy_data *pd = ptr;
2538         void *fp = pd->fp;
2539         __le32 buf[2];
2540         size_t len;
2541         int rc;
2542
2543         len = strlen(key);
2544         buf[0] = cpu_to_le32(len);
2545         buf[1] = cpu_to_le32(levdatum->isalias);
2546         rc = put_entry(buf, sizeof(u32), 2, fp);
2547         if (rc)
2548                 return rc;
2549
2550         rc = put_entry(key, 1, len, fp);
2551         if (rc)
2552                 return rc;
2553
2554         rc = mls_write_level(levdatum->level, fp);
2555         if (rc)
2556                 return rc;
2557
2558         return 0;
2559 }
2560
2561 static int cat_write(void *vkey, void *datum, void *ptr)
2562 {
2563         char *key = vkey;
2564         struct cat_datum *catdatum = datum;
2565         struct policy_data *pd = ptr;
2566         void *fp = pd->fp;
2567         __le32 buf[3];
2568         size_t len;
2569         int rc;
2570
2571         len = strlen(key);
2572         buf[0] = cpu_to_le32(len);
2573         buf[1] = cpu_to_le32(catdatum->value);
2574         buf[2] = cpu_to_le32(catdatum->isalias);
2575         rc = put_entry(buf, sizeof(u32), 3, fp);
2576         if (rc)
2577                 return rc;
2578
2579         rc = put_entry(key, 1, len, fp);
2580         if (rc)
2581                 return rc;
2582
2583         return 0;
2584 }
2585
2586 static int role_trans_write(struct policydb *p, void *fp)
2587 {
2588         struct role_trans *r = p->role_tr;
2589         struct role_trans *tr;
2590         u32 buf[3];
2591         size_t nel;
2592         int rc;
2593
2594         nel = 0;
2595         for (tr = r; tr; tr = tr->next)
2596                 nel++;
2597         buf[0] = cpu_to_le32(nel);
2598         rc = put_entry(buf, sizeof(u32), 1, fp);
2599         if (rc)
2600                 return rc;
2601         for (tr = r; tr; tr = tr->next) {
2602                 buf[0] = cpu_to_le32(tr->role);
2603                 buf[1] = cpu_to_le32(tr->type);
2604                 buf[2] = cpu_to_le32(tr->new_role);
2605                 rc = put_entry(buf, sizeof(u32), 3, fp);
2606                 if (rc)
2607                         return rc;
2608                 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2609                         buf[0] = cpu_to_le32(tr->tclass);
2610                         rc = put_entry(buf, sizeof(u32), 1, fp);
2611                         if (rc)
2612                                 return rc;
2613                 }
2614         }
2615
2616         return 0;
2617 }
2618
2619 static int role_allow_write(struct role_allow *r, void *fp)
2620 {
2621         struct role_allow *ra;
2622         u32 buf[2];
2623         size_t nel;
2624         int rc;
2625
2626         nel = 0;
2627         for (ra = r; ra; ra = ra->next)
2628                 nel++;
2629         buf[0] = cpu_to_le32(nel);
2630         rc = put_entry(buf, sizeof(u32), 1, fp);
2631         if (rc)
2632                 return rc;
2633         for (ra = r; ra; ra = ra->next) {
2634                 buf[0] = cpu_to_le32(ra->role);
2635                 buf[1] = cpu_to_le32(ra->new_role);
2636                 rc = put_entry(buf, sizeof(u32), 2, fp);
2637                 if (rc)
2638                         return rc;
2639         }
2640         return 0;
2641 }
2642
2643 /*
2644  * Write a security context structure
2645  * to a policydb binary representation file.
2646  */
2647 static int context_write(struct policydb *p, struct context *c,
2648                          void *fp)
2649 {
2650         int rc;
2651         __le32 buf[3];
2652
2653         buf[0] = cpu_to_le32(c->user);
2654         buf[1] = cpu_to_le32(c->role);
2655         buf[2] = cpu_to_le32(c->type);
2656
2657         rc = put_entry(buf, sizeof(u32), 3, fp);
2658         if (rc)
2659                 return rc;
2660
2661         rc = mls_write_range_helper(&c->range, fp);
2662         if (rc)
2663                 return rc;
2664
2665         return 0;
2666 }
2667
2668 /*
2669  * The following *_write functions are used to
2670  * write the symbol data to a policy database
2671  * binary representation file.
2672  */
2673
2674 static int perm_write(void *vkey, void *datum, void *fp)
2675 {
2676         char *key = vkey;
2677         struct perm_datum *perdatum = datum;
2678         __le32 buf[2];
2679         size_t len;
2680         int rc;
2681
2682         len = strlen(key);
2683         buf[0] = cpu_to_le32(len);
2684         buf[1] = cpu_to_le32(perdatum->value);
2685         rc = put_entry(buf, sizeof(u32), 2, fp);
2686         if (rc)
2687                 return rc;
2688
2689         rc = put_entry(key, 1, len, fp);
2690         if (rc)
2691                 return rc;
2692
2693         return 0;
2694 }
2695
2696 static int common_write(void *vkey, void *datum, void *ptr)
2697 {
2698         char *key = vkey;
2699         struct common_datum *comdatum = datum;
2700         struct policy_data *pd = ptr;
2701         void *fp = pd->fp;
2702         __le32 buf[4];
2703         size_t len;
2704         int rc;
2705
2706         len = strlen(key);
2707         buf[0] = cpu_to_le32(len);
2708         buf[1] = cpu_to_le32(comdatum->value);
2709         buf[2] = cpu_to_le32(comdatum->permissions.nprim);
2710         buf[3] = cpu_to_le32(comdatum->permissions.table->nel);
2711         rc = put_entry(buf, sizeof(u32), 4, fp);
2712         if (rc)
2713                 return rc;
2714
2715         rc = put_entry(key, 1, len, fp);
2716         if (rc)
2717                 return rc;
2718
2719         rc = hashtab_map(comdatum->permissions.table, perm_write, fp);
2720         if (rc)
2721                 return rc;
2722
2723         return 0;
2724 }
2725
2726 static int write_cons_helper(struct policydb *p, struct constraint_node *node,
2727                              void *fp)
2728 {
2729         struct constraint_node *c;
2730         struct constraint_expr *e;
2731         __le32 buf[3];
2732         u32 nel;
2733         int rc;
2734
2735         for (c = node; c; c = c->next) {
2736                 nel = 0;
2737                 for (e = c->expr; e; e = e->next)
2738                         nel++;
2739                 buf[0] = cpu_to_le32(c->permissions);
2740                 buf[1] = cpu_to_le32(nel);
2741                 rc = put_entry(buf, sizeof(u32), 2, fp);
2742                 if (rc)
2743                         return rc;
2744                 for (e = c->expr; e; e = e->next) {
2745                         buf[0] = cpu_to_le32(e->expr_type);
2746                         buf[1] = cpu_to_le32(e->attr);
2747                         buf[2] = cpu_to_le32(e->op);
2748                         rc = put_entry(buf, sizeof(u32), 3, fp);
2749                         if (rc)
2750                                 return rc;
2751
2752                         switch (e->expr_type) {
2753                         case CEXPR_NAMES:
2754                                 rc = ebitmap_write(&e->names, fp);
2755                                 if (rc)
2756                                         return rc;
2757                                 break;
2758                         default:
2759                                 break;
2760                         }
2761                 }
2762         }
2763
2764         return 0;
2765 }
2766
2767 static int class_write(void *vkey, void *datum, void *ptr)
2768 {
2769         char *key = vkey;
2770         struct class_datum *cladatum = datum;
2771         struct policy_data *pd = ptr;
2772         void *fp = pd->fp;
2773         struct policydb *p = pd->p;
2774         struct constraint_node *c;
2775         __le32 buf[6];
2776         u32 ncons;
2777         size_t len, len2;
2778         int rc;
2779
2780         len = strlen(key);
2781         if (cladatum->comkey)
2782                 len2 = strlen(cladatum->comkey);
2783         else
2784                 len2 = 0;
2785
2786         ncons = 0;
2787         for (c = cladatum->constraints; c; c = c->next)
2788                 ncons++;
2789
2790         buf[0] = cpu_to_le32(len);
2791         buf[1] = cpu_to_le32(len2);
2792         buf[2] = cpu_to_le32(cladatum->value);
2793         buf[3] = cpu_to_le32(cladatum->permissions.nprim);
2794         if (cladatum->permissions.table)
2795                 buf[4] = cpu_to_le32(cladatum->permissions.table->nel);
2796         else
2797                 buf[4] = 0;
2798         buf[5] = cpu_to_le32(ncons);
2799         rc = put_entry(buf, sizeof(u32), 6, fp);
2800         if (rc)
2801                 return rc;
2802
2803         rc = put_entry(key, 1, len, fp);
2804         if (rc)
2805                 return rc;
2806
2807         if (cladatum->comkey) {
2808                 rc = put_entry(cladatum->comkey, 1, len2, fp);
2809                 if (rc)
2810                         return rc;
2811         }
2812
2813         rc = hashtab_map(cladatum->permissions.table, perm_write, fp);
2814         if (rc)
2815                 return rc;
2816
2817         rc = write_cons_helper(p, cladatum->constraints, fp);
2818         if (rc)
2819                 return rc;
2820
2821         /* write out the validatetrans rule */
2822         ncons = 0;
2823         for (c = cladatum->validatetrans; c; c = c->next)
2824                 ncons++;
2825
2826         buf[0] = cpu_to_le32(ncons);
2827         rc = put_entry(buf, sizeof(u32), 1, fp);
2828         if (rc)
2829                 return rc;
2830
2831         rc = write_cons_helper(p, cladatum->validatetrans, fp);
2832         if (rc)
2833                 return rc;
2834
2835         return 0;
2836 }
2837
2838 static int role_write(void *vkey, void *datum, void *ptr)
2839 {
2840         char *key = vkey;
2841         struct role_datum *role = datum;
2842         struct policy_data *pd = ptr;
2843         void *fp = pd->fp;
2844         struct policydb *p = pd->p;
2845         __le32 buf[3];
2846         size_t items, len;
2847         int rc;
2848
2849         len = strlen(key);
2850         items = 0;
2851         buf[items++] = cpu_to_le32(len);
2852         buf[items++] = cpu_to_le32(role->value);
2853         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
2854                 buf[items++] = cpu_to_le32(role->bounds);
2855
2856         BUG_ON(items > (sizeof(buf)/sizeof(buf[0])));
2857
2858         rc = put_entry(buf, sizeof(u32), items, fp);
2859         if (rc)
2860                 return rc;
2861
2862         rc = put_entry(key, 1, len, fp);
2863         if (rc)
2864                 return rc;
2865
2866         rc = ebitmap_write(&role->dominates, fp);
2867         if (rc)
2868                 return rc;
2869
2870         rc = ebitmap_write(&role->types, fp);
2871         if (rc)
2872                 return rc;
2873
2874         return 0;
2875 }
2876
2877 static int type_write(void *vkey, void *datum, void *ptr)
2878 {
2879         char *key = vkey;
2880         struct type_datum *typdatum = datum;
2881         struct policy_data *pd = ptr;
2882         struct policydb *p = pd->p;
2883         void *fp = pd->fp;
2884         __le32 buf[4];
2885         int rc;
2886         size_t items, len;
2887
2888         len = strlen(key);
2889         items = 0;
2890         buf[items++] = cpu_to_le32(len);
2891         buf[items++] = cpu_to_le32(typdatum->value);
2892         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
2893                 u32 properties = 0;
2894
2895                 if (typdatum->primary)
2896                         properties |= TYPEDATUM_PROPERTY_PRIMARY;
2897
2898                 if (typdatum->attribute)
2899                         properties |= TYPEDATUM_PROPERTY_ATTRIBUTE;
2900
2901                 buf[items++] = cpu_to_le32(properties);
2902                 buf[items++] = cpu_to_le32(typdatum->bounds);
2903         } else {
2904                 buf[items++] = cpu_to_le32(typdatum->primary);
2905         }
2906         BUG_ON(items > (sizeof(buf) / sizeof(buf[0])));
2907         rc = put_entry(buf, sizeof(u32), items, fp);
2908         if (rc)
2909                 return rc;
2910
2911         rc = put_entry(key, 1, len, fp);
2912         if (rc)
2913                 return rc;
2914
2915         return 0;
2916 }
2917
2918 static int user_write(void *vkey, void *datum, void *ptr)
2919 {
2920         char *key = vkey;
2921         struct user_datum *usrdatum = datum;
2922         struct policy_data *pd = ptr;
2923         struct policydb *p = pd->p;
2924         void *fp = pd->fp;
2925         __le32 buf[3];
2926         size_t items, len;
2927         int rc;
2928
2929         len = strlen(key);
2930         items = 0;
2931         buf[items++] = cpu_to_le32(len);
2932         buf[items++] = cpu_to_le32(usrdatum->value);
2933         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
2934                 buf[items++] = cpu_to_le32(usrdatum->bounds);
2935         BUG_ON(items > (sizeof(buf) / sizeof(buf[0])));
2936         rc = put_entry(buf, sizeof(u32), items, fp);
2937         if (rc)
2938                 return rc;
2939
2940         rc = put_entry(key, 1, len, fp);
2941         if (rc)
2942                 return rc;
2943
2944         rc = ebitmap_write(&usrdatum->roles, fp);
2945         if (rc)
2946                 return rc;
2947
2948         rc = mls_write_range_helper(&usrdatum->range, fp);
2949         if (rc)
2950                 return rc;
2951
2952         rc = mls_write_level(&usrdatum->dfltlevel, fp);
2953         if (rc)
2954                 return rc;
2955
2956         return 0;
2957 }
2958
2959 static int (*write_f[SYM_NUM]) (void *key, void *datum,
2960                                 void *datap) =
2961 {
2962         common_write,
2963         class_write,
2964         role_write,
2965         type_write,
2966         user_write,
2967         cond_write_bool,
2968         sens_write,
2969         cat_write,
2970 };
2971
2972 static int ocontext_write(struct policydb *p, struct policydb_compat_info *info,
2973                           void *fp)
2974 {
2975         unsigned int i, j, rc;
2976         size_t nel, len;
2977         __le32 buf[3];
2978         u32 nodebuf[8];
2979         struct ocontext *c;
2980         for (i = 0; i < info->ocon_num; i++) {
2981                 nel = 0;
2982                 for (c = p->ocontexts[i]; c; c = c->next)
2983                         nel++;
2984                 buf[0] = cpu_to_le32(nel);
2985                 rc = put_entry(buf, sizeof(u32), 1, fp);
2986                 if (rc)
2987                         return rc;
2988                 for (c = p->ocontexts[i]; c; c = c->next) {
2989                         switch (i) {
2990                         case OCON_ISID:
2991                                 buf[0] = cpu_to_le32(c->sid[0]);
2992                                 rc = put_entry(buf, sizeof(u32), 1, fp);
2993                                 if (rc)
2994                                         return rc;
2995                                 rc = context_write(p, &c->context[0], fp);
2996                                 if (rc)
2997                                         return rc;
2998                                 break;
2999                         case OCON_FS:
3000                         case OCON_NETIF:
3001                                 len = strlen(c->u.name);
3002                                 buf[0] = cpu_to_le32(len);
3003                                 rc = put_entry(buf, sizeof(u32), 1, fp);
3004                                 if (rc)
3005                                         return rc;
3006                                 rc = put_entry(c->u.name, 1, len, fp);
3007                                 if (rc)
3008                                         return rc;
3009                                 rc = context_write(p, &c->context[0], fp);
3010                                 if (rc)
3011                                         return rc;
3012                                 rc = context_write(p, &c->context[1], fp);
3013                                 if (rc)
3014                                         return rc;
3015                                 break;
3016                         case OCON_PORT:
3017                                 buf[0] = cpu_to_le32(c->u.port.protocol);
3018                                 buf[1] = cpu_to_le32(c->u.port.low_port);
3019                                 buf[2] = cpu_to_le32(c->u.port.high_port);
3020                                 rc = put_entry(buf, sizeof(u32), 3, fp);
3021                                 if (rc)
3022                                         return rc;
3023                                 rc = context_write(p, &c->context[0], fp);
3024                                 if (rc)
3025                                         return rc;
3026                                 break;
3027                         case OCON_NODE:
3028                                 nodebuf[0] = c->u.node.addr; /* network order */
3029                                 nodebuf[1] = c->u.node.mask; /* network order */
3030                                 rc = put_entry(nodebuf, sizeof(u32), 2, fp);
3031                                 if (rc)
3032                                         return rc;
3033                                 rc = context_write(p, &c->context[0], fp);
3034                                 if (rc)
3035                                         return rc;
3036                                 break;
3037                         case OCON_FSUSE:
3038                                 buf[0] = cpu_to_le32(c->v.behavior);
3039                                 len = strlen(c->u.name);
3040                                 buf[1] = cpu_to_le32(len);
3041                                 rc = put_entry(buf, sizeof(u32), 2, fp);
3042                                 if (rc)
3043                                         return rc;
3044                                 rc = put_entry(c->u.name, 1, len, fp);
3045                                 if (rc)
3046                                         return rc;
3047                                 rc = context_write(p, &c->context[0], fp);
3048                                 if (rc)
3049                                         return rc;
3050                                 break;
3051                         case OCON_NODE6:
3052                                 for (j = 0; j < 4; j++)
3053                                         nodebuf[j] = c->u.node6.addr[j]; /* network order */
3054                                 for (j = 0; j < 4; j++)
3055                                         nodebuf[j + 4] = c->u.node6.mask[j]; /* network order */
3056                                 rc = put_entry(nodebuf, sizeof(u32), 8, 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                         }
3064                 }
3065         }
3066         return 0;
3067 }
3068
3069 static int genfs_write(struct policydb *p, void *fp)
3070 {
3071         struct genfs *genfs;
3072         struct ocontext *c;
3073         size_t len;
3074         __le32 buf[1];
3075         int rc;
3076
3077         len = 0;
3078         for (genfs = p->genfs; genfs; genfs = genfs->next)
3079                 len++;
3080         buf[0] = cpu_to_le32(len);
3081         rc = put_entry(buf, sizeof(u32), 1, fp);
3082         if (rc)
3083                 return rc;
3084         for (genfs = p->genfs; genfs; genfs = genfs->next) {
3085                 len = strlen(genfs->fstype);
3086                 buf[0] = cpu_to_le32(len);
3087                 rc = put_entry(buf, sizeof(u32), 1, fp);
3088                 if (rc)
3089                         return rc;
3090                 rc = put_entry(genfs->fstype, 1, len, fp);
3091                 if (rc)
3092                         return rc;
3093                 len = 0;
3094                 for (c = genfs->head; c; c = c->next)
3095                         len++;
3096                 buf[0] = cpu_to_le32(len);
3097                 rc = put_entry(buf, sizeof(u32), 1, fp);
3098                 if (rc)
3099                         return rc;
3100                 for (c = genfs->head; c; c = c->next) {
3101                         len = strlen(c->u.name);
3102                         buf[0] = cpu_to_le32(len);
3103                         rc = put_entry(buf, sizeof(u32), 1, fp);
3104                         if (rc)
3105                                 return rc;
3106                         rc = put_entry(c->u.name, 1, len, fp);
3107                         if (rc)
3108                                 return rc;
3109                         buf[0] = cpu_to_le32(c->v.sclass);
3110                         rc = put_entry(buf, sizeof(u32), 1, fp);
3111                         if (rc)
3112                                 return rc;
3113                         rc = context_write(p, &c->context[0], fp);
3114                         if (rc)
3115                                 return rc;
3116                 }
3117         }
3118         return 0;
3119 }
3120
3121 static int hashtab_cnt(void *key, void *data, void *ptr)
3122 {
3123         int *cnt = ptr;
3124         *cnt = *cnt + 1;
3125
3126         return 0;
3127 }
3128
3129 static int range_write_helper(void *key, void *data, void *ptr)
3130 {
3131         __le32 buf[2];
3132         struct range_trans *rt = key;
3133         struct mls_range *r = data;
3134         struct policy_data *pd = ptr;
3135         void *fp = pd->fp;
3136         struct policydb *p = pd->p;
3137         int rc;
3138
3139         buf[0] = cpu_to_le32(rt->source_type);
3140         buf[1] = cpu_to_le32(rt->target_type);
3141         rc = put_entry(buf, sizeof(u32), 2, fp);
3142         if (rc)
3143                 return rc;
3144         if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
3145                 buf[0] = cpu_to_le32(rt->target_class);
3146                 rc = put_entry(buf, sizeof(u32), 1, fp);
3147                 if (rc)
3148                         return rc;
3149         }
3150         rc = mls_write_range_helper(r, fp);
3151         if (rc)
3152                 return rc;
3153
3154         return 0;
3155 }
3156
3157 static int range_write(struct policydb *p, void *fp)
3158 {
3159         size_t nel;
3160         __le32 buf[1];
3161         int rc;
3162         struct policy_data pd;
3163
3164         pd.p = p;
3165         pd.fp = fp;
3166
3167         /* count the number of entries in the hashtab */
3168         nel = 0;
3169         rc = hashtab_map(p->range_tr, hashtab_cnt, &nel);
3170         if (rc)
3171                 return rc;
3172
3173         buf[0] = cpu_to_le32(nel);
3174         rc = put_entry(buf, sizeof(u32), 1, fp);
3175         if (rc)
3176                 return rc;
3177
3178         /* actually write all of the entries */
3179         rc = hashtab_map(p->range_tr, range_write_helper, &pd);
3180         if (rc)
3181                 return rc;
3182
3183         return 0;
3184 }
3185
3186 static int filename_write_helper(void *key, void *data, void *ptr)
3187 {
3188         __le32 buf[4];
3189         struct filename_trans *ft = key;
3190         struct filename_trans_datum *otype = data;
3191         void *fp = ptr;
3192         int rc;
3193         u32 len;
3194
3195         len = strlen(ft->name);
3196         buf[0] = cpu_to_le32(len);
3197         rc = put_entry(buf, sizeof(u32), 1, fp);
3198         if (rc)
3199                 return rc;
3200
3201         rc = put_entry(ft->name, sizeof(char), len, fp);
3202         if (rc)
3203                 return rc;
3204
3205         buf[0] = ft->stype;
3206         buf[1] = ft->ttype;
3207         buf[2] = ft->tclass;
3208         buf[3] = otype->otype;
3209
3210         rc = put_entry(buf, sizeof(u32), 4, fp);
3211         if (rc)
3212                 return rc;
3213
3214         return 0;
3215 }
3216
3217 static int filename_trans_write(struct policydb *p, void *fp)
3218 {
3219         u32 nel;
3220         __le32 buf[1];
3221         int rc;
3222
3223         if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
3224                 return 0;
3225
3226         nel = 0;
3227         rc = hashtab_map(p->filename_trans, hashtab_cnt, &nel);
3228         if (rc)
3229                 return rc;
3230
3231         buf[0] = cpu_to_le32(nel);
3232         rc = put_entry(buf, sizeof(u32), 1, fp);
3233         if (rc)
3234                 return rc;
3235
3236         rc = hashtab_map(p->filename_trans, filename_write_helper, fp);
3237         if (rc)
3238                 return rc;
3239
3240         return 0;
3241 }
3242
3243 /*
3244  * Write the configuration data in a policy database
3245  * structure to a policy database binary representation
3246  * file.
3247  */
3248 int policydb_write(struct policydb *p, void *fp)
3249 {
3250         unsigned int i, num_syms;
3251         int rc;
3252         __le32 buf[4];
3253         u32 config;
3254         size_t len;
3255         struct policydb_compat_info *info;
3256
3257         /*
3258          * refuse to write policy older than compressed avtab
3259          * to simplify the writer.  There are other tests dropped
3260          * since we assume this throughout the writer code.  Be
3261          * careful if you ever try to remove this restriction
3262          */
3263         if (p->policyvers < POLICYDB_VERSION_AVTAB) {
3264                 printk(KERN_ERR "SELinux: refusing to write policy version %d."
3265                        "  Because it is less than version %d\n", p->policyvers,
3266                        POLICYDB_VERSION_AVTAB);
3267                 return -EINVAL;
3268         }
3269
3270         config = 0;
3271         if (p->mls_enabled)
3272                 config |= POLICYDB_CONFIG_MLS;
3273
3274         if (p->reject_unknown)
3275                 config |= REJECT_UNKNOWN;
3276         if (p->allow_unknown)
3277                 config |= ALLOW_UNKNOWN;
3278
3279         /* Write the magic number and string identifiers. */
3280         buf[0] = cpu_to_le32(POLICYDB_MAGIC);
3281         len = strlen(POLICYDB_STRING);
3282         buf[1] = cpu_to_le32(len);
3283         rc = put_entry(buf, sizeof(u32), 2, fp);
3284         if (rc)
3285                 return rc;
3286         rc = put_entry(POLICYDB_STRING, 1, len, fp);
3287         if (rc)
3288                 return rc;
3289
3290         /* Write the version, config, and table sizes. */
3291         info = policydb_lookup_compat(p->policyvers);
3292         if (!info) {
3293                 printk(KERN_ERR "SELinux: compatibility lookup failed for policy "
3294                     "version %d", p->policyvers);
3295                 return -EINVAL;
3296         }
3297
3298         buf[0] = cpu_to_le32(p->policyvers);
3299         buf[1] = cpu_to_le32(config);
3300         buf[2] = cpu_to_le32(info->sym_num);
3301         buf[3] = cpu_to_le32(info->ocon_num);
3302
3303         rc = put_entry(buf, sizeof(u32), 4, fp);
3304         if (rc)
3305                 return rc;
3306
3307         if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
3308                 rc = ebitmap_write(&p->policycaps, fp);
3309                 if (rc)
3310                         return rc;
3311         }
3312
3313         if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
3314                 rc = ebitmap_write(&p->permissive_map, fp);
3315                 if (rc)
3316                         return rc;
3317         }
3318
3319         num_syms = info->sym_num;
3320         for (i = 0; i < num_syms; i++) {
3321                 struct policy_data pd;
3322
3323                 pd.fp = fp;
3324                 pd.p = p;
3325
3326                 buf[0] = cpu_to_le32(p->symtab[i].nprim);
3327                 buf[1] = cpu_to_le32(p->symtab[i].table->nel);
3328
3329                 rc = put_entry(buf, sizeof(u32), 2, fp);
3330                 if (rc)
3331                         return rc;
3332                 rc = hashtab_map(p->symtab[i].table, write_f[i], &pd);
3333                 if (rc)
3334                         return rc;
3335         }
3336
3337         rc = avtab_write(p, &p->te_avtab, fp);
3338         if (rc)
3339                 return rc;
3340
3341         rc = cond_write_list(p, p->cond_list, fp);
3342         if (rc)
3343                 return rc;
3344
3345         rc = role_trans_write(p, fp);
3346         if (rc)
3347                 return rc;
3348
3349         rc = role_allow_write(p->role_allow, fp);
3350         if (rc)
3351                 return rc;
3352
3353         rc = filename_trans_write(p, fp);
3354         if (rc)
3355                 return rc;
3356
3357         rc = ocontext_write(p, info, fp);
3358         if (rc)
3359                 return rc;
3360
3361         rc = genfs_write(p, fp);
3362         if (rc)
3363                 return rc;
3364
3365         rc = range_write(p, fp);
3366         if (rc)
3367                 return rc;
3368
3369         for (i = 0; i < p->p_types.nprim; i++) {
3370                 struct ebitmap *e = flex_array_get(p->type_attr_map_array, i);
3371
3372                 BUG_ON(!e);
3373                 rc = ebitmap_write(e, fp);
3374                 if (rc)
3375                         return rc;
3376         }
3377
3378         return 0;
3379 }