security/selinux/ss/policydb.c

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