security/selinux/ss/policydb.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Implementation of the policy database.
   4  *
   5  * Author : Stephen Smalley, <sds@tycho.nsa.gov>
   6  */
   7
   8 /*
   9  * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
  10  *
  11  *      Support for enhanced MLS infrastructure.
  12  *
  13  * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
  14  *
  15  *      Added conditional policy language extensions
  16  *
  17  * Updated: Hewlett-Packard <paul@paul-moore.com>
  18  *
  19  *      Added support for the policy capability bitmap
  20  *
  21  * Update: Mellanox Techonologies
  22  *
  23  *      Added Infiniband support
  24  *
  25  * Copyright (C) 2016 Mellanox Techonologies
  26  * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
  27  * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
  28  * Copyright (C) 2003 - 2004 Tresys Technology, LLC
  29  */
  30
  31 #include <linux/kernel.h>
  32 #include <linux/sched.h>
  33 #include <linux/slab.h>
  34 #include <linux/string.h>
  35 #include <linux/errno.h>
  36 #include <linux/audit.h>
  37 #include "security.h"
  38
  39 #include "policydb.h"
  40 #include "conditional.h"
  41 #include "mls.h"
  42 #include "services.h"
  43
  44 #define _DEBUG_HASHES
  45
  46 #ifdef DEBUG_HASHES
  47 static const char *symtab_name[SYM_NUM] = {
  48         "common prefixes",
  49         "classes",
  50         "roles",
  51         "types",
  52         "users",
  53         "bools",
  54         "levels",
  55         "categories",
  56 };
  57 #endif
  58
  59 static unsigned int symtab_sizes[SYM_NUM] = {
  60         2,
  61         32,
  62         16,
  63         512,
  64         128,
  65         16,
  66         16,
  67         16,
  68 };
  69
  70 struct policydb_compat_info {
  71         int version;
  72         int sym_num;
  73         int ocon_num;
  74 };
  75
  76 /* These need to be updated if SYM_NUM or OCON_NUM changes */
  77 static struct policydb_compat_info policydb_compat[] = {
  78         {
  79                 .version        = POLICYDB_VERSION_BASE,
  80                 .sym_num        = SYM_NUM - 3,
  81                 .ocon_num       = OCON_NUM - 3,
  82         },
  83         {
  84                 .version        = POLICYDB_VERSION_BOOL,
  85                 .sym_num        = SYM_NUM - 2,
  86                 .ocon_num       = OCON_NUM - 3,
  87         },
  88         {
  89                 .version        = POLICYDB_VERSION_IPV6,
  90                 .sym_num        = SYM_NUM - 2,
  91                 .ocon_num       = OCON_NUM - 2,
  92         },
  93         {
  94                 .version        = POLICYDB_VERSION_NLCLASS,
  95                 .sym_num        = SYM_NUM - 2,
  96                 .ocon_num       = OCON_NUM - 2,
  97         },
  98         {
  99                 .version        = POLICYDB_VERSION_MLS,
 100                 .sym_num        = SYM_NUM,
 101                 .ocon_num       = OCON_NUM - 2,
 102         },
 103         {
 104                 .version        = POLICYDB_VERSION_AVTAB,
 105                 .sym_num        = SYM_NUM,
 106                 .ocon_num       = OCON_NUM - 2,
 107         },
 108         {
 109                 .version        = POLICYDB_VERSION_RANGETRANS,
 110                 .sym_num        = SYM_NUM,
 111                 .ocon_num       = OCON_NUM - 2,
 112         },
 113         {
 114                 .version        = POLICYDB_VERSION_POLCAP,
 115                 .sym_num        = SYM_NUM,
 116                 .ocon_num       = OCON_NUM - 2,
 117         },
 118         {
 119                 .version        = POLICYDB_VERSION_PERMISSIVE,
 120                 .sym_num        = SYM_NUM,
 121                 .ocon_num       = OCON_NUM - 2,
 122         },
 123         {
 124                 .version        = POLICYDB_VERSION_BOUNDARY,
 125                 .sym_num        = SYM_NUM,
 126                 .ocon_num       = OCON_NUM - 2,
 127         },
 128         {
 129                 .version        = POLICYDB_VERSION_FILENAME_TRANS,
 130                 .sym_num        = SYM_NUM,
 131                 .ocon_num       = OCON_NUM - 2,
 132         },
 133         {
 134                 .version        = POLICYDB_VERSION_ROLETRANS,
 135                 .sym_num        = SYM_NUM,
 136                 .ocon_num       = OCON_NUM - 2,
 137         },
 138         {
 139                 .version        = POLICYDB_VERSION_NEW_OBJECT_DEFAULTS,
 140                 .sym_num        = SYM_NUM,
 141                 .ocon_num       = OCON_NUM - 2,
 142         },
 143         {
 144                 .version        = POLICYDB_VERSION_DEFAULT_TYPE,
 145                 .sym_num        = SYM_NUM,
 146                 .ocon_num       = OCON_NUM - 2,
 147         },
 148         {
 149                 .version        = POLICYDB_VERSION_CONSTRAINT_NAMES,
 150                 .sym_num        = SYM_NUM,
 151                 .ocon_num       = OCON_NUM - 2,
 152         },
 153         {
 154                 .version        = POLICYDB_VERSION_XPERMS_IOCTL,
 155                 .sym_num        = SYM_NUM,
 156                 .ocon_num       = OCON_NUM - 2,
 157         },
 158         {
 159                 .version        = POLICYDB_VERSION_INFINIBAND,
 160                 .sym_num        = SYM_NUM,
 161                 .ocon_num       = OCON_NUM,
 162         },
 163         {
 164                 .version        = POLICYDB_VERSION_GLBLUB,
 165                 .sym_num        = SYM_NUM,
 166                 .ocon_num       = OCON_NUM,
 167         },
 168 };
 169
 170 static struct policydb_compat_info *policydb_lookup_compat(int version)
 171 {
 172         int i;
 173         struct policydb_compat_info *info = NULL;
 174
 175         for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) {
 176                 if (policydb_compat[i].version == version) {
 177                         info = &policydb_compat[i];
 178                         break;
 179                 }
 180         }
 181         return info;
 182 }
 183
 184 /*
 185  * The following *_destroy functions are used to
 186  * free any memory allocated for each kind of
 187  * symbol data in the policy database.
 188  */
 189
 190 static int perm_destroy(void *key, void *datum, void *p)
 191 {
 192         kfree(key);
 193         kfree(datum);
 194         return 0;
 195 }
 196
 197 static int common_destroy(void *key, void *datum, void *p)
 198 {
 199         struct common_datum *comdatum;
 200
 201         kfree(key);
 202         if (datum) {
 203                 comdatum = datum;
 204                 hashtab_map(comdatum->permissions.table, perm_destroy, NULL);
 205                 hashtab_destroy(comdatum->permissions.table);
 206         }
 207         kfree(datum);
 208         return 0;
 209 }
 210
 211 static void constraint_expr_destroy(struct constraint_expr *expr)
 212 {
 213         if (expr) {
 214                 ebitmap_destroy(&expr->names);
 215                 if (expr->type_names) {
 216                         ebitmap_destroy(&expr->type_names->types);
 217                         ebitmap_destroy(&expr->type_names->negset);
 218                         kfree(expr->type_names);
 219                 }
 220                 kfree(expr);
 221         }
 222 }
 223
 224 static int cls_destroy(void *key, void *datum, void *p)
 225 {
 226         struct class_datum *cladatum;
 227         struct constraint_node *constraint, *ctemp;
 228         struct constraint_expr *e, *etmp;
 229
 230         kfree(key);
 231         if (datum) {
 232                 cladatum = datum;
 233                 hashtab_map(cladatum->permissions.table, perm_destroy, NULL);
 234                 hashtab_destroy(cladatum->permissions.table);
 235                 constraint = cladatum->constraints;
 236                 while (constraint) {
 237                         e = constraint->expr;
 238                         while (e) {
 239                                 etmp = e;
 240                                 e = e->next;
 241                                 constraint_expr_destroy(etmp);
 242                         }
 243                         ctemp = constraint;
 244                         constraint = constraint->next;
 245                         kfree(ctemp);
 246                 }
 247
 248                 constraint = cladatum->validatetrans;
 249                 while (constraint) {
 250                         e = constraint->expr;
 251                         while (e) {
 252                                 etmp = e;
 253                                 e = e->next;
 254                                 constraint_expr_destroy(etmp);
 255                         }
 256                         ctemp = constraint;
 257                         constraint = constraint->next;
 258                         kfree(ctemp);
 259                 }
 260                 kfree(cladatum->comkey);
 261         }
 262         kfree(datum);
 263         return 0;
 264 }
 265
 266 static int role_destroy(void *key, void *datum, void *p)
 267 {
 268         struct role_datum *role;
 269
 270         kfree(key);
 271         if (datum) {
 272                 role = datum;
 273                 ebitmap_destroy(&role->dominates);
 274                 ebitmap_destroy(&role->types);
 275         }
 276         kfree(datum);
 277         return 0;
 278 }
 279
 280 static int type_destroy(void *key, void *datum, void *p)
 281 {
 282         kfree(key);
 283         kfree(datum);
 284         return 0;
 285 }
 286
 287 static int user_destroy(void *key, void *datum, void *p)
 288 {
 289         struct user_datum *usrdatum;
 290
 291         kfree(key);
 292         if (datum) {
 293                 usrdatum = datum;
 294                 ebitmap_destroy(&usrdatum->roles);
 295                 ebitmap_destroy(&usrdatum->range.level[0].cat);
 296                 ebitmap_destroy(&usrdatum->range.level[1].cat);
 297                 ebitmap_destroy(&usrdatum->dfltlevel.cat);
 298         }
 299         kfree(datum);
 300         return 0;
 301 }
 302
 303 static int sens_destroy(void *key, void *datum, void *p)
 304 {
 305         struct level_datum *levdatum;
 306
 307         kfree(key);
 308         if (datum) {
 309                 levdatum = datum;
 310                 if (levdatum->level)
 311                         ebitmap_destroy(&levdatum->level->cat);
 312                 kfree(levdatum->level);
 313         }
 314         kfree(datum);
 315         return 0;
 316 }
 317
 318 static int cat_destroy(void *key, void *datum, void *p)
 319 {
 320         kfree(key);
 321         kfree(datum);
 322         return 0;
 323 }
 324
 325 static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) =
 326 {
 327         common_destroy,
 328         cls_destroy,
 329         role_destroy,
 330         type_destroy,
 331         user_destroy,
 332         cond_destroy_bool,
 333         sens_destroy,
 334         cat_destroy,
 335 };
 336
 337 static int filenametr_destroy(void *key, void *datum, void *p)
 338 {
 339         struct filename_trans *ft = key;
 340
 341         kfree(ft->name);
 342         kfree(key);
 343         kfree(datum);
 344         cond_resched();
 345         return 0;
 346 }
 347
 348 static int range_tr_destroy(void *key, void *datum, void *p)
 349 {
 350         struct mls_range *rt = datum;
 351
 352         kfree(key);
 353         ebitmap_destroy(&rt->level[0].cat);
 354         ebitmap_destroy(&rt->level[1].cat);
 355         kfree(datum);
 356         cond_resched();
 357         return 0;
 358 }
 359
 360 static void ocontext_destroy(struct ocontext *c, int i)
 361 {
 362         if (!c)
 363                 return;
 364
 365         context_destroy(&c->context[0]);
 366         context_destroy(&c->context[1]);
 367         if (i == OCON_ISID || i == OCON_FS ||
 368             i == OCON_NETIF || i == OCON_FSUSE)
 369                 kfree(c->u.name);
 370         kfree(c);
 371 }
 372
 373 /*
 374  * Initialize the role table.
 375  */
 376 static int roles_init(struct policydb *p)
 377 {
 378         char *key = NULL;
 379         int rc;
 380         struct role_datum *role;
 381
 382         role = kzalloc(sizeof(*role), GFP_KERNEL);
 383         if (!role)
 384                 return -ENOMEM;
 385
 386         rc = -EINVAL;
 387         role->value = ++p->p_roles.nprim;
 388         if (role->value != OBJECT_R_VAL)
 389                 goto out;
 390
 391         rc = -ENOMEM;
 392         key = kstrdup(OBJECT_R, GFP_KERNEL);
 393         if (!key)
 394                 goto out;
 395
 396         rc = hashtab_insert(p->p_roles.table, key, role);
 397         if (rc)
 398                 goto out;
 399
 400         return 0;
 401 out:
 402         kfree(key);
 403         kfree(role);
 404         return rc;
 405 }
 406
 407 static u32 filenametr_hash(struct hashtab *h, const void *k)
 408 {
 409         const struct filename_trans *ft = k;
 410         unsigned long hash;
 411         unsigned int byte_num;
 412         unsigned char focus;
 413
 414         hash = ft->stype ^ ft->ttype ^ ft->tclass;
 415
 416         byte_num = 0;
 417         while ((focus = ft->name[byte_num++]))
 418                 hash = partial_name_hash(focus, hash);
 419         return hash & (h->size - 1);
 420 }
 421
 422 static int filenametr_cmp(struct hashtab *h, const void *k1, const void *k2)
 423 {
 424         const struct filename_trans *ft1 = k1;
 425         const struct filename_trans *ft2 = k2;
 426         int v;
 427
 428         v = ft1->stype - ft2->stype;
 429         if (v)
 430                 return v;
 431
 432         v = ft1->ttype - ft2->ttype;
 433         if (v)
 434                 return v;
 435
 436         v = ft1->tclass - ft2->tclass;
 437         if (v)
 438                 return v;
 439
 440         return strcmp(ft1->name, ft2->name);
 441
 442 }
 443
 444 static u32 rangetr_hash(struct hashtab *h, const void *k)
 445 {
 446         const struct range_trans *key = k;
 447
 448         return (key->source_type + (key->target_type << 3) +
 449                 (key->target_class << 5)) & (h->size - 1);
 450 }
 451
 452 static int rangetr_cmp(struct hashtab *h, const void *k1, const void *k2)
 453 {
 454         const struct range_trans *key1 = k1, *key2 = k2;
 455         int v;
 456
 457         v = key1->source_type - key2->source_type;
 458         if (v)
 459                 return v;
 460
 461         v = key1->target_type - key2->target_type;
 462         if (v)
 463                 return v;
 464
 465         v = key1->target_class - key2->target_class;
 466
 467         return v;
 468 }
 469
 470 /*
 471  * Initialize a policy database structure.
 472  */
 473 static int policydb_init(struct policydb *p)
 474 {
 475         int i, rc;
 476
 477         memset(p, 0, sizeof(*p));
 478
 479         for (i = 0; i < SYM_NUM; i++) {
 480                 rc = symtab_init(&p->symtab[i], symtab_sizes[i]);
 481                 if (rc)
 482                         goto out;
 483         }
 484
 485         rc = avtab_init(&p->te_avtab);
 486         if (rc)
 487                 goto out;
 488
 489         rc = roles_init(p);
 490         if (rc)
 491                 goto out;
 492
 493         rc = cond_policydb_init(p);
 494         if (rc)
 495                 goto out;
 496
 497         p->filename_trans = hashtab_create(filenametr_hash, filenametr_cmp,
 498                                            (1 << 10));
 499         if (!p->filename_trans) {
 500                 rc = -ENOMEM;
 501                 goto out;
 502         }
 503
 504         p->range_tr = hashtab_create(rangetr_hash, rangetr_cmp, 256);
 505         if (!p->range_tr) {
 506                 rc = -ENOMEM;
 507                 goto out;
 508         }
 509
 510         ebitmap_init(&p->filename_trans_ttypes);
 511         ebitmap_init(&p->policycaps);
 512         ebitmap_init(&p->permissive_map);
 513
 514         return 0;
 515 out:
 516         hashtab_destroy(p->filename_trans);
 517         hashtab_destroy(p->range_tr);
 518         for (i = 0; i < SYM_NUM; i++) {
 519                 hashtab_map(p->symtab[i].table, destroy_f[i], NULL);
 520                 hashtab_destroy(p->symtab[i].table);
 521         }
 522         return rc;
 523 }
 524
 525 /*
 526  * The following *_index functions are used to
 527  * define the val_to_name and val_to_struct arrays
 528  * in a policy database structure.  The val_to_name
 529  * arrays are used when converting security context
 530  * structures into string representations.  The
 531  * val_to_struct arrays are used when the attributes
 532  * of a class, role, or user are needed.
 533  */
 534
 535 static int common_index(void *key, void *datum, void *datap)
 536 {
 537         struct policydb *p;
 538         struct common_datum *comdatum;
 539
 540         comdatum = datum;
 541         p = datap;
 542         if (!comdatum->value || comdatum->value > p->p_commons.nprim)
 543                 return -EINVAL;
 544
 545         p->sym_val_to_name[SYM_COMMONS][comdatum->value - 1] = key;
 546
 547         return 0;
 548 }
 549
 550 static int class_index(void *key, void *datum, void *datap)
 551 {
 552         struct policydb *p;
 553         struct class_datum *cladatum;
 554
 555         cladatum = datum;
 556         p = datap;
 557         if (!cladatum->value || cladatum->value > p->p_classes.nprim)
 558                 return -EINVAL;
 559
 560         p->sym_val_to_name[SYM_CLASSES][cladatum->value - 1] = key;
 561         p->class_val_to_struct[cladatum->value - 1] = cladatum;
 562         return 0;
 563 }
 564
 565 static int role_index(void *key, void *datum, void *datap)
 566 {
 567         struct policydb *p;
 568         struct role_datum *role;
 569
 570         role = datum;
 571         p = datap;
 572         if (!role->value
 573             || role->value > p->p_roles.nprim
 574             || role->bounds > p->p_roles.nprim)
 575                 return -EINVAL;
 576
 577         p->sym_val_to_name[SYM_ROLES][role->value - 1] = key;
 578         p->role_val_to_struct[role->value - 1] = role;
 579         return 0;
 580 }
 581
 582 static int type_index(void *key, void *datum, void *datap)
 583 {
 584         struct policydb *p;
 585         struct type_datum *typdatum;
 586
 587         typdatum = datum;
 588         p = datap;
 589
 590         if (typdatum->primary) {
 591                 if (!typdatum->value
 592                     || typdatum->value > p->p_types.nprim
 593                     || typdatum->bounds > p->p_types.nprim)
 594                         return -EINVAL;
 595                 p->sym_val_to_name[SYM_TYPES][typdatum->value - 1] = key;
 596                 p->type_val_to_struct[typdatum->value - 1] = typdatum;
 597         }
 598
 599         return 0;
 600 }
 601
 602 static int user_index(void *key, void *datum, void *datap)
 603 {
 604         struct policydb *p;
 605         struct user_datum *usrdatum;
 606
 607         usrdatum = datum;
 608         p = datap;
 609         if (!usrdatum->value
 610             || usrdatum->value > p->p_users.nprim
 611             || usrdatum->bounds > p->p_users.nprim)
 612                 return -EINVAL;
 613
 614         p->sym_val_to_name[SYM_USERS][usrdatum->value - 1] = key;
 615         p->user_val_to_struct[usrdatum->value - 1] = usrdatum;
 616         return 0;
 617 }
 618
 619 static int sens_index(void *key, void *datum, void *datap)
 620 {
 621         struct policydb *p;
 622         struct level_datum *levdatum;
 623
 624         levdatum = datum;
 625         p = datap;
 626
 627         if (!levdatum->isalias) {
 628                 if (!levdatum->level->sens ||
 629                     levdatum->level->sens > p->p_levels.nprim)
 630                         return -EINVAL;
 631
 632                 p->sym_val_to_name[SYM_LEVELS][levdatum->level->sens - 1] = key;
 633         }
 634
 635         return 0;
 636 }
 637
 638 static int cat_index(void *key, void *datum, void *datap)
 639 {
 640         struct policydb *p;
 641         struct cat_datum *catdatum;
 642
 643         catdatum = datum;
 644         p = datap;
 645
 646         if (!catdatum->isalias) {
 647                 if (!catdatum->value || catdatum->value > p->p_cats.nprim)
 648                         return -EINVAL;
 649
 650                 p->sym_val_to_name[SYM_CATS][catdatum->value - 1] = key;
 651         }
 652
 653         return 0;
 654 }
 655
 656 static int (*index_f[SYM_NUM]) (void *key, void *datum, void *datap) =
 657 {
 658         common_index,
 659         class_index,
 660         role_index,
 661         type_index,
 662         user_index,
 663         cond_index_bool,
 664         sens_index,
 665         cat_index,
 666 };
 667
 668 #ifdef DEBUG_HASHES
 669 static void hash_eval(struct hashtab *h, const char *hash_name)
 670 {
 671         struct hashtab_info info;
 672
 673         hashtab_stat(h, &info);
 674         pr_debug("SELinux: %s:  %d entries and %d/%d buckets used, longest chain length %d\n",
 675                  hash_name, h->nel, info.slots_used, h->size,
 676                  info.max_chain_len);
 677 }
 678
 679 static void symtab_hash_eval(struct symtab *s)
 680 {
 681         int i;
 682
 683         for (i = 0; i < SYM_NUM; i++)
 684                 hash_eval(s[i].table, symtab_name[i]);
 685 }
 686
 687 #else
 688 static inline void hash_eval(struct hashtab *h, char *hash_name)
 689 {
 690 }
 691 #endif
 692
 693 /*
 694  * Define the other val_to_name and val_to_struct arrays
 695  * in a policy database structure.
 696  *
 697  * Caller must clean up on failure.
 698  */
 699 static int policydb_index(struct policydb *p)
 700 {
 701         int i, rc;
 702
 703         if (p->mls_enabled)
 704                 pr_debug("SELinux:  %d users, %d roles, %d types, %d bools, %d sens, %d cats\n",
 705                          p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim,
 706                          p->p_bools.nprim, p->p_levels.nprim, p->p_cats.nprim);
 707         else
 708                 pr_debug("SELinux:  %d users, %d roles, %d types, %d bools\n",
 709                          p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim,
 710                          p->p_bools.nprim);
 711
 712         pr_debug("SELinux:  %d classes, %d rules\n",
 713                  p->p_classes.nprim, p->te_avtab.nel);
 714
 715 #ifdef DEBUG_HASHES
 716         avtab_hash_eval(&p->te_avtab, "rules");
 717         symtab_hash_eval(p->symtab);
 718 #endif
 719
 720         p->class_val_to_struct = kcalloc(p->p_classes.nprim,
 721                                          sizeof(*p->class_val_to_struct),
 722                                          GFP_KERNEL);
 723         if (!p->class_val_to_struct)
 724                 return -ENOMEM;
 725
 726         p->role_val_to_struct = kcalloc(p->p_roles.nprim,
 727                                         sizeof(*p->role_val_to_struct),
 728                                         GFP_KERNEL);
 729         if (!p->role_val_to_struct)
 730                 return -ENOMEM;
 731
 732         p->user_val_to_struct = kcalloc(p->p_users.nprim,
 733                                         sizeof(*p->user_val_to_struct),
 734                                         GFP_KERNEL);
 735         if (!p->user_val_to_struct)
 736                 return -ENOMEM;
 737
 738         p->type_val_to_struct = kvcalloc(p->p_types.nprim,
 739                                          sizeof(*p->type_val_to_struct),
 740                                          GFP_KERNEL);
 741         if (!p->type_val_to_struct)
 742                 return -ENOMEM;
 743
 744         rc = cond_init_bool_indexes(p);
 745         if (rc)
 746                 goto out;
 747
 748         for (i = 0; i < SYM_NUM; i++) {
 749                 p->sym_val_to_name[i] = kvcalloc(p->symtab[i].nprim,
 750                                                  sizeof(char *),
 751                                                  GFP_KERNEL);
 752                 if (!p->sym_val_to_name[i])
 753                         return -ENOMEM;
 754
 755                 rc = hashtab_map(p->symtab[i].table, index_f[i], p);
 756                 if (rc)
 757                         goto out;
 758         }
 759         rc = 0;
 760 out:
 761         return rc;
 762 }
 763
 764 /*
 765  * Free any memory allocated by a policy database structure.
 766  */
 767 void policydb_destroy(struct policydb *p)
 768 {
 769         struct ocontext *c, *ctmp;
 770         struct genfs *g, *gtmp;
 771         int i;
 772         struct role_allow *ra, *lra = NULL;
 773         struct role_trans *tr, *ltr = NULL;
 774
 775         for (i = 0; i < SYM_NUM; i++) {
 776                 cond_resched();
 777                 hashtab_map(p->symtab[i].table, destroy_f[i], NULL);
 778                 hashtab_destroy(p->symtab[i].table);
 779         }
 780
 781         for (i = 0; i < SYM_NUM; i++)
 782                 kvfree(p->sym_val_to_name[i]);
 783
 784         kfree(p->class_val_to_struct);
 785         kfree(p->role_val_to_struct);
 786         kfree(p->user_val_to_struct);
 787         kvfree(p->type_val_to_struct);
 788
 789         avtab_destroy(&p->te_avtab);
 790
 791         for (i = 0; i < OCON_NUM; i++) {
 792                 cond_resched();
 793                 c = p->ocontexts[i];
 794                 while (c) {
 795                         ctmp = c;
 796                         c = c->next;
 797                         ocontext_destroy(ctmp, i);
 798                 }
 799                 p->ocontexts[i] = NULL;
 800         }
 801
 802         g = p->genfs;
 803         while (g) {
 804                 cond_resched();
 805                 kfree(g->fstype);
 806                 c = g->head;
 807                 while (c) {
 808                         ctmp = c;
 809                         c = c->next;
 810                         ocontext_destroy(ctmp, OCON_FSUSE);
 811                 }
 812                 gtmp = g;
 813                 g = g->next;
 814                 kfree(gtmp);
 815         }
 816         p->genfs = NULL;
 817
 818         cond_policydb_destroy(p);
 819
 820         for (tr = p->role_tr; tr; tr = tr->next) {
 821                 cond_resched();
 822                 kfree(ltr);
 823                 ltr = tr;
 824         }
 825         kfree(ltr);
 826
 827         for (ra = p->role_allow; ra; ra = ra->next) {
 828                 cond_resched();
 829                 kfree(lra);
 830                 lra = ra;
 831         }
 832         kfree(lra);
 833
 834         hashtab_map(p->filename_trans, filenametr_destroy, NULL);
 835         hashtab_destroy(p->filename_trans);
 836
 837         hashtab_map(p->range_tr, range_tr_destroy, NULL);
 838         hashtab_destroy(p->range_tr);
 839
 840         if (p->type_attr_map_array) {
 841                 for (i = 0; i < p->p_types.nprim; i++)
 842                         ebitmap_destroy(&p->type_attr_map_array[i]);
 843                 kvfree(p->type_attr_map_array);
 844         }
 845
 846         ebitmap_destroy(&p->filename_trans_ttypes);
 847         ebitmap_destroy(&p->policycaps);
 848         ebitmap_destroy(&p->permissive_map);
 849 }
 850
 851 /*
 852  * Load the initial SIDs specified in a policy database
 853  * structure into a SID table.
 854  */
 855 int policydb_load_isids(struct policydb *p, struct sidtab *s)
 856 {
 857         struct ocontext *head, *c;
 858         int rc;
 859
 860         rc = sidtab_init(s);
 861         if (rc) {
 862                 pr_err("SELinux:  out of memory on SID table init\n");
 863                 goto out;
 864         }
 865
 866         head = p->ocontexts[OCON_ISID];
 867         for (c = head; c; c = c->next) {
 868                 rc = -EINVAL;
 869                 if (!c->context[0].user) {
 870                         pr_err("SELinux:  SID %s was never defined.\n",
 871                                 c->u.name);
 872                         sidtab_destroy(s);
 873                         goto out;
 874                 }
 875                 if (c->sid[0] == SECSID_NULL || c->sid[0] > SECINITSID_NUM) {
 876                         pr_err("SELinux:  Initial SID %s out of range.\n",
 877                                 c->u.name);
 878                         sidtab_destroy(s);
 879                         goto out;
 880                 }
 881                 rc = context_add_hash(p, &c->context[0]);
 882                 if (rc) {
 883                         sidtab_destroy(s);
 884                         goto out;
 885                 }
 886
 887                 rc = sidtab_set_initial(s, c->sid[0], &c->context[0]);
 888                 if (rc) {
 889                         pr_err("SELinux:  unable to load initial SID %s.\n",
 890                                 c->u.name);
 891                         sidtab_destroy(s);
 892                         goto out;
 893                 }
 894         }
 895         rc = 0;
 896 out:
 897         return rc;
 898 }
 899
 900 int policydb_class_isvalid(struct policydb *p, unsigned int class)
 901 {
 902         if (!class || class > p->p_classes.nprim)
 903                 return 0;
 904         return 1;
 905 }
 906
 907 int policydb_role_isvalid(struct policydb *p, unsigned int role)
 908 {
 909         if (!role || role > p->p_roles.nprim)
 910                 return 0;
 911         return 1;
 912 }
 913
 914 int policydb_type_isvalid(struct policydb *p, unsigned int type)
 915 {
 916         if (!type || type > p->p_types.nprim)
 917                 return 0;
 918         return 1;
 919 }
 920
 921 /*
 922  * Return 1 if the fields in the security context
 923  * structure `c' are valid.  Return 0 otherwise.
 924  */
 925 int policydb_context_isvalid(struct policydb *p, struct context *c)
 926 {
 927         struct role_datum *role;
 928         struct user_datum *usrdatum;
 929
 930         if (!c->role || c->role > p->p_roles.nprim)
 931                 return 0;
 932
 933         if (!c->user || c->user > p->p_users.nprim)
 934                 return 0;
 935
 936         if (!c->type || c->type > p->p_types.nprim)
 937                 return 0;
 938
 939         if (c->role != OBJECT_R_VAL) {
 940                 /*
 941                  * Role must be authorized for the type.
 942                  */
 943                 role = p->role_val_to_struct[c->role - 1];
 944                 if (!role || !ebitmap_get_bit(&role->types, c->type - 1))
 945                         /* role may not be associated with type */
 946                         return 0;
 947
 948                 /*
 949                  * User must be authorized for the role.
 950                  */
 951                 usrdatum = p->user_val_to_struct[c->user - 1];
 952                 if (!usrdatum)
 953                         return 0;
 954
 955                 if (!ebitmap_get_bit(&usrdatum->roles, c->role - 1))
 956                         /* user may not be associated with role */
 957                         return 0;
 958         }
 959
 960         if (!mls_context_isvalid(p, c))
 961                 return 0;
 962
 963         return 1;
 964 }
 965
 966 /*
 967  * Read a MLS range structure from a policydb binary
 968  * representation file.
 969  */
 970 static int mls_read_range_helper(struct mls_range *r, void *fp)
 971 {
 972         __le32 buf[2];
 973         u32 items;
 974         int rc;
 975
 976         rc = next_entry(buf, fp, sizeof(u32));
 977         if (rc)
 978                 goto out;
 979
 980         rc = -EINVAL;
 981         items = le32_to_cpu(buf[0]);
 982         if (items > ARRAY_SIZE(buf)) {
 983                 pr_err("SELinux: mls:  range overflow\n");
 984                 goto out;
 985         }
 986
 987         rc = next_entry(buf, fp, sizeof(u32) * items);
 988         if (rc) {
 989                 pr_err("SELinux: mls:  truncated range\n");
 990                 goto out;
 991         }
 992
 993         r->level[0].sens = le32_to_cpu(buf[0]);
 994         if (items > 1)
 995                 r->level[1].sens = le32_to_cpu(buf[1]);
 996         else
 997                 r->level[1].sens = r->level[0].sens;
 998
 999         rc = ebitmap_read(&r->level[0].cat, fp);
1000         if (rc) {
1001                 pr_err("SELinux: mls:  error reading low categories\n");
1002                 goto out;
1003         }
1004         if (items > 1) {
1005                 rc = ebitmap_read(&r->level[1].cat, fp);
1006                 if (rc) {
1007                         pr_err("SELinux: mls:  error reading high categories\n");
1008                         goto bad_high;
1009                 }
1010         } else {
1011                 rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat);
1012                 if (rc) {
1013                         pr_err("SELinux: mls:  out of memory\n");
1014                         goto bad_high;
1015                 }
1016         }
1017
1018         return 0;
1019 bad_high:
1020         ebitmap_destroy(&r->level[0].cat);
1021 out:
1022         return rc;
1023 }
1024
1025 /*
1026  * Read and validate a security context structure
1027  * from a policydb binary representation file.
1028  */
1029 static int context_read_and_validate(struct context *c,
1030                                      struct policydb *p,
1031                                      void *fp)
1032 {
1033         __le32 buf[3];
1034         int rc;
1035
1036         rc = next_entry(buf, fp, sizeof buf);
1037         if (rc) {
1038                 pr_err("SELinux: context truncated\n");
1039                 goto out;
1040         }
1041         c->user = le32_to_cpu(buf[0]);
1042         c->role = le32_to_cpu(buf[1]);
1043         c->type = le32_to_cpu(buf[2]);
1044         if (p->policyvers >= POLICYDB_VERSION_MLS) {
1045                 rc = mls_read_range_helper(&c->range, fp);
1046                 if (rc) {
1047                         pr_err("SELinux: error reading MLS range of context\n");
1048                         goto out;
1049                 }
1050         }
1051
1052         rc = -EINVAL;
1053         if (!policydb_context_isvalid(p, c)) {
1054                 pr_err("SELinux:  invalid security context\n");
1055                 context_destroy(c);
1056                 goto out;
1057         }
1058         rc = 0;
1059 out:
1060         return rc;
1061 }
1062
1063 /*
1064  * The following *_read functions are used to
1065  * read the symbol data from a policy database
1066  * binary representation file.
1067  */
1068
1069 static int str_read(char **strp, gfp_t flags, void *fp, u32 len)
1070 {
1071         int rc;
1072         char *str;
1073
1074         if ((len == 0) || (len == (u32)-1))
1075                 return -EINVAL;
1076
1077         str = kmalloc(len + 1, flags | __GFP_NOWARN);
1078         if (!str)
1079                 return -ENOMEM;
1080
1081         /* it's expected the caller should free the str */
1082         *strp = str;
1083
1084         rc = next_entry(str, fp, len);
1085         if (rc)
1086                 return rc;
1087
1088         str[len] = '\0';
1089         return 0;
1090 }
1091
1092 static int perm_read(struct policydb *p, struct hashtab *h, void *fp)
1093 {
1094         char *key = NULL;
1095         struct perm_datum *perdatum;
1096         int rc;
1097         __le32 buf[2];
1098         u32 len;
1099
1100         perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
1101         if (!perdatum)
1102                 return -ENOMEM;
1103
1104         rc = next_entry(buf, fp, sizeof buf);
1105         if (rc)
1106                 goto bad;
1107
1108         len = le32_to_cpu(buf[0]);
1109         perdatum->value = le32_to_cpu(buf[1]);
1110
1111         rc = str_read(&key, GFP_KERNEL, fp, len);
1112         if (rc)
1113                 goto bad;
1114
1115         rc = hashtab_insert(h, key, perdatum);
1116         if (rc)
1117                 goto bad;
1118
1119         return 0;
1120 bad:
1121         perm_destroy(key, perdatum, NULL);
1122         return rc;
1123 }
1124
1125 static int common_read(struct policydb *p, struct hashtab *h, void *fp)
1126 {
1127         char *key = NULL;
1128         struct common_datum *comdatum;
1129         __le32 buf[4];
1130         u32 len, nel;
1131         int i, rc;
1132
1133         comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
1134         if (!comdatum)
1135                 return -ENOMEM;
1136
1137         rc = next_entry(buf, fp, sizeof buf);
1138         if (rc)
1139                 goto bad;
1140
1141         len = le32_to_cpu(buf[0]);
1142         comdatum->value = le32_to_cpu(buf[1]);
1143
1144         rc = symtab_init(&comdatum->permissions, PERM_SYMTAB_SIZE);
1145         if (rc)
1146                 goto bad;
1147         comdatum->permissions.nprim = le32_to_cpu(buf[2]);
1148         nel = le32_to_cpu(buf[3]);
1149
1150         rc = str_read(&key, GFP_KERNEL, fp, len);
1151         if (rc)
1152                 goto bad;
1153
1154         for (i = 0; i < nel; i++) {
1155                 rc = perm_read(p, comdatum->permissions.table, fp);
1156                 if (rc)
1157                         goto bad;
1158         }
1159
1160         rc = hashtab_insert(h, key, comdatum);
1161         if (rc)
1162                 goto bad;
1163         return 0;
1164 bad:
1165         common_destroy(key, comdatum, NULL);
1166         return rc;
1167 }
1168
1169 static void type_set_init(struct type_set *t)
1170 {
1171         ebitmap_init(&t->types);
1172         ebitmap_init(&t->negset);
1173 }
1174
1175 static int type_set_read(struct type_set *t, void *fp)
1176 {
1177         __le32 buf[1];
1178         int rc;
1179
1180         if (ebitmap_read(&t->types, fp))
1181                 return -EINVAL;
1182         if (ebitmap_read(&t->negset, fp))
1183                 return -EINVAL;
1184
1185         rc = next_entry(buf, fp, sizeof(u32));
1186         if (rc < 0)
1187                 return -EINVAL;
1188         t->flags = le32_to_cpu(buf[0]);
1189
1190         return 0;
1191 }
1192
1193
1194 static int read_cons_helper(struct policydb *p,
1195                                 struct constraint_node **nodep,
1196                                 int ncons, int allowxtarget, void *fp)
1197 {
1198         struct constraint_node *c, *lc;
1199         struct constraint_expr *e, *le;
1200         __le32 buf[3];
1201         u32 nexpr;
1202         int rc, i, j, depth;
1203
1204         lc = NULL;
1205         for (i = 0; i < ncons; i++) {
1206                 c = kzalloc(sizeof(*c), GFP_KERNEL);
1207                 if (!c)
1208                         return -ENOMEM;
1209
1210                 if (lc)
1211                         lc->next = c;
1212                 else
1213                         *nodep = c;
1214
1215                 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1216                 if (rc)
1217                         return rc;
1218                 c->permissions = le32_to_cpu(buf[0]);
1219                 nexpr = le32_to_cpu(buf[1]);
1220                 le = NULL;
1221                 depth = -1;
1222                 for (j = 0; j < nexpr; j++) {
1223                         e = kzalloc(sizeof(*e), GFP_KERNEL);
1224                         if (!e)
1225                                 return -ENOMEM;
1226
1227                         if (le)
1228                                 le->next = e;
1229                         else
1230                                 c->expr = e;
1231
1232                         rc = next_entry(buf, fp, (sizeof(u32) * 3));
1233                         if (rc)
1234                                 return rc;
1235                         e->expr_type = le32_to_cpu(buf[0]);
1236                         e->attr = le32_to_cpu(buf[1]);
1237                         e->op = le32_to_cpu(buf[2]);
1238
1239                         switch (e->expr_type) {
1240                         case CEXPR_NOT:
1241                                 if (depth < 0)
1242                                         return -EINVAL;
1243                                 break;
1244                         case CEXPR_AND:
1245                         case CEXPR_OR:
1246                                 if (depth < 1)
1247                                         return -EINVAL;
1248                                 depth--;
1249                                 break;
1250                         case CEXPR_ATTR:
1251                                 if (depth == (CEXPR_MAXDEPTH - 1))
1252                                         return -EINVAL;
1253                                 depth++;
1254                                 break;
1255                         case CEXPR_NAMES:
1256                                 if (!allowxtarget && (e->attr & CEXPR_XTARGET))
1257                                         return -EINVAL;
1258                                 if (depth == (CEXPR_MAXDEPTH - 1))
1259                                         return -EINVAL;
1260                                 depth++;
1261                                 rc = ebitmap_read(&e->names, fp);
1262                                 if (rc)
1263                                         return rc;
1264                                 if (p->policyvers >=
1265                                         POLICYDB_VERSION_CONSTRAINT_NAMES) {
1266                                                 e->type_names = kzalloc(sizeof
1267                                                 (*e->type_names),
1268                                                 GFP_KERNEL);
1269                                         if (!e->type_names)
1270                                                 return -ENOMEM;
1271                                         type_set_init(e->type_names);
1272                                         rc = type_set_read(e->type_names, fp);
1273                                         if (rc)
1274                                                 return rc;
1275                                 }
1276                                 break;
1277                         default:
1278                                 return -EINVAL;
1279                         }
1280                         le = e;
1281                 }
1282                 if (depth != 0)
1283                         return -EINVAL;
1284                 lc = c;
1285         }
1286
1287         return 0;
1288 }
1289
1290 static int class_read(struct policydb *p, struct hashtab *h, void *fp)
1291 {
1292         char *key = NULL;
1293         struct class_datum *cladatum;
1294         __le32 buf[6];
1295         u32 len, len2, ncons, nel;
1296         int i, rc;
1297
1298         cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
1299         if (!cladatum)
1300                 return -ENOMEM;
1301
1302         rc = next_entry(buf, fp, sizeof(u32)*6);
1303         if (rc)
1304                 goto bad;
1305
1306         len = le32_to_cpu(buf[0]);
1307         len2 = le32_to_cpu(buf[1]);
1308         cladatum->value = le32_to_cpu(buf[2]);
1309
1310         rc = symtab_init(&cladatum->permissions, PERM_SYMTAB_SIZE);
1311         if (rc)
1312                 goto bad;
1313         cladatum->permissions.nprim = le32_to_cpu(buf[3]);
1314         nel = le32_to_cpu(buf[4]);
1315
1316         ncons = le32_to_cpu(buf[5]);
1317
1318         rc = str_read(&key, GFP_KERNEL, fp, len);
1319         if (rc)
1320                 goto bad;
1321
1322         if (len2) {
1323                 rc = str_read(&cladatum->comkey, GFP_KERNEL, fp, len2);
1324                 if (rc)
1325                         goto bad;
1326
1327                 rc = -EINVAL;
1328                 cladatum->comdatum = hashtab_search(p->p_commons.table, cladatum->comkey);
1329                 if (!cladatum->comdatum) {
1330                         pr_err("SELinux:  unknown common %s\n",
1331                                cladatum->comkey);
1332                         goto bad;
1333                 }
1334         }
1335         for (i = 0; i < nel; i++) {
1336                 rc = perm_read(p, cladatum->permissions.table, fp);
1337                 if (rc)
1338                         goto bad;
1339         }
1340
1341         rc = read_cons_helper(p, &cladatum->constraints, ncons, 0, fp);
1342         if (rc)
1343                 goto bad;
1344
1345         if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
1346                 /* grab the validatetrans rules */
1347                 rc = next_entry(buf, fp, sizeof(u32));
1348                 if (rc)
1349                         goto bad;
1350                 ncons = le32_to_cpu(buf[0]);
1351                 rc = read_cons_helper(p, &cladatum->validatetrans,
1352                                 ncons, 1, fp);
1353                 if (rc)
1354                         goto bad;
1355         }
1356
1357         if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
1358                 rc = next_entry(buf, fp, sizeof(u32) * 3);
1359                 if (rc)
1360                         goto bad;
1361
1362                 cladatum->default_user = le32_to_cpu(buf[0]);
1363                 cladatum->default_role = le32_to_cpu(buf[1]);
1364                 cladatum->default_range = le32_to_cpu(buf[2]);
1365         }
1366
1367         if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
1368                 rc = next_entry(buf, fp, sizeof(u32) * 1);
1369                 if (rc)
1370                         goto bad;
1371                 cladatum->default_type = le32_to_cpu(buf[0]);
1372         }
1373
1374         rc = hashtab_insert(h, key, cladatum);
1375         if (rc)
1376                 goto bad;
1377
1378         return 0;
1379 bad:
1380         cls_destroy(key, cladatum, NULL);
1381         return rc;
1382 }
1383
1384 static int role_read(struct policydb *p, struct hashtab *h, void *fp)
1385 {
1386         char *key = NULL;
1387         struct role_datum *role;
1388         int rc, to_read = 2;
1389         __le32 buf[3];
1390         u32 len;
1391
1392         role = kzalloc(sizeof(*role), GFP_KERNEL);
1393         if (!role)
1394                 return -ENOMEM;
1395
1396         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1397                 to_read = 3;
1398
1399         rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1400         if (rc)
1401                 goto bad;
1402
1403         len = le32_to_cpu(buf[0]);
1404         role->value = le32_to_cpu(buf[1]);
1405         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1406                 role->bounds = le32_to_cpu(buf[2]);
1407
1408         rc = str_read(&key, GFP_KERNEL, fp, len);
1409         if (rc)
1410                 goto bad;
1411
1412         rc = ebitmap_read(&role->dominates, fp);
1413         if (rc)
1414                 goto bad;
1415
1416         rc = ebitmap_read(&role->types, fp);
1417         if (rc)
1418                 goto bad;
1419
1420         if (strcmp(key, OBJECT_R) == 0) {
1421                 rc = -EINVAL;
1422                 if (role->value != OBJECT_R_VAL) {
1423                         pr_err("SELinux: Role %s has wrong value %d\n",
1424                                OBJECT_R, role->value);
1425                         goto bad;
1426                 }
1427                 rc = 0;
1428                 goto bad;
1429         }
1430
1431         rc = hashtab_insert(h, key, role);
1432         if (rc)
1433                 goto bad;
1434         return 0;
1435 bad:
1436         role_destroy(key, role, NULL);
1437         return rc;
1438 }
1439
1440 static int type_read(struct policydb *p, struct hashtab *h, void *fp)
1441 {
1442         char *key = NULL;
1443         struct type_datum *typdatum;
1444         int rc, to_read = 3;
1445         __le32 buf[4];
1446         u32 len;
1447
1448         typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL);
1449         if (!typdatum)
1450                 return -ENOMEM;
1451
1452         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1453                 to_read = 4;
1454
1455         rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1456         if (rc)
1457                 goto bad;
1458
1459         len = le32_to_cpu(buf[0]);
1460         typdatum->value = le32_to_cpu(buf[1]);
1461         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
1462                 u32 prop = le32_to_cpu(buf[2]);
1463
1464                 if (prop & TYPEDATUM_PROPERTY_PRIMARY)
1465                         typdatum->primary = 1;
1466                 if (prop & TYPEDATUM_PROPERTY_ATTRIBUTE)
1467                         typdatum->attribute = 1;
1468
1469                 typdatum->bounds = le32_to_cpu(buf[3]);
1470         } else {
1471                 typdatum->primary = le32_to_cpu(buf[2]);
1472         }
1473
1474         rc = str_read(&key, GFP_KERNEL, fp, len);
1475         if (rc)
1476                 goto bad;
1477
1478         rc = hashtab_insert(h, key, typdatum);
1479         if (rc)
1480                 goto bad;
1481         return 0;
1482 bad:
1483         type_destroy(key, typdatum, NULL);
1484         return rc;
1485 }
1486
1487
1488 /*
1489  * Read a MLS level structure from a policydb binary
1490  * representation file.
1491  */
1492 static int mls_read_level(struct mls_level *lp, void *fp)
1493 {
1494         __le32 buf[1];
1495         int rc;
1496
1497         memset(lp, 0, sizeof(*lp));
1498
1499         rc = next_entry(buf, fp, sizeof buf);
1500         if (rc) {
1501                 pr_err("SELinux: mls: truncated level\n");
1502                 return rc;
1503         }
1504         lp->sens = le32_to_cpu(buf[0]);
1505
1506         rc = ebitmap_read(&lp->cat, fp);
1507         if (rc) {
1508                 pr_err("SELinux: mls:  error reading level categories\n");
1509                 return rc;
1510         }
1511         return 0;
1512 }
1513
1514 static int user_read(struct policydb *p, struct hashtab *h, void *fp)
1515 {
1516         char *key = NULL;
1517         struct user_datum *usrdatum;
1518         int rc, to_read = 2;
1519         __le32 buf[3];
1520         u32 len;
1521
1522         usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
1523         if (!usrdatum)
1524                 return -ENOMEM;
1525
1526         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1527                 to_read = 3;
1528
1529         rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1530         if (rc)
1531                 goto bad;
1532
1533         len = le32_to_cpu(buf[0]);
1534         usrdatum->value = le32_to_cpu(buf[1]);
1535         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1536                 usrdatum->bounds = le32_to_cpu(buf[2]);
1537
1538         rc = str_read(&key, GFP_KERNEL, fp, len);
1539         if (rc)
1540                 goto bad;
1541
1542         rc = ebitmap_read(&usrdatum->roles, fp);
1543         if (rc)
1544                 goto bad;
1545
1546         if (p->policyvers >= POLICYDB_VERSION_MLS) {
1547                 rc = mls_read_range_helper(&usrdatum->range, fp);
1548                 if (rc)
1549                         goto bad;
1550                 rc = mls_read_level(&usrdatum->dfltlevel, fp);
1551                 if (rc)
1552                         goto bad;
1553         }
1554
1555         rc = hashtab_insert(h, key, usrdatum);
1556         if (rc)
1557                 goto bad;
1558         return 0;
1559 bad:
1560         user_destroy(key, usrdatum, NULL);
1561         return rc;
1562 }
1563
1564 static int sens_read(struct policydb *p, struct hashtab *h, void *fp)
1565 {
1566         char *key = NULL;
1567         struct level_datum *levdatum;
1568         int rc;
1569         __le32 buf[2];
1570         u32 len;
1571
1572         levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC);
1573         if (!levdatum)
1574                 return -ENOMEM;
1575
1576         rc = next_entry(buf, fp, sizeof buf);
1577         if (rc)
1578                 goto bad;
1579
1580         len = le32_to_cpu(buf[0]);
1581         levdatum->isalias = le32_to_cpu(buf[1]);
1582
1583         rc = str_read(&key, GFP_ATOMIC, fp, len);
1584         if (rc)
1585                 goto bad;
1586
1587         rc = -ENOMEM;
1588         levdatum->level = kmalloc(sizeof(*levdatum->level), GFP_ATOMIC);
1589         if (!levdatum->level)
1590                 goto bad;
1591
1592         rc = mls_read_level(levdatum->level, fp);
1593         if (rc)
1594                 goto bad;
1595
1596         rc = hashtab_insert(h, key, levdatum);
1597         if (rc)
1598                 goto bad;
1599         return 0;
1600 bad:
1601         sens_destroy(key, levdatum, NULL);
1602         return rc;
1603 }
1604
1605 static int cat_read(struct policydb *p, struct hashtab *h, void *fp)
1606 {
1607         char *key = NULL;
1608         struct cat_datum *catdatum;
1609         int rc;
1610         __le32 buf[3];
1611         u32 len;
1612
1613         catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC);
1614         if (!catdatum)
1615                 return -ENOMEM;
1616
1617         rc = next_entry(buf, fp, sizeof buf);
1618         if (rc)
1619                 goto bad;
1620
1621         len = le32_to_cpu(buf[0]);
1622         catdatum->value = le32_to_cpu(buf[1]);
1623         catdatum->isalias = le32_to_cpu(buf[2]);
1624
1625         rc = str_read(&key, GFP_ATOMIC, fp, len);
1626         if (rc)
1627                 goto bad;
1628
1629         rc = hashtab_insert(h, key, catdatum);
1630         if (rc)
1631                 goto bad;
1632         return 0;
1633 bad:
1634         cat_destroy(key, catdatum, NULL);
1635         return rc;
1636 }
1637
1638 static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, void *fp) =
1639 {
1640         common_read,
1641         class_read,
1642         role_read,
1643         type_read,
1644         user_read,
1645         cond_read_bool,
1646         sens_read,
1647         cat_read,
1648 };
1649
1650 static int user_bounds_sanity_check(void *key, void *datum, void *datap)
1651 {
1652         struct user_datum *upper, *user;
1653         struct policydb *p = datap;
1654         int depth = 0;
1655
1656         upper = user = datum;
1657         while (upper->bounds) {
1658                 struct ebitmap_node *node;
1659                 unsigned long bit;
1660
1661                 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1662                         pr_err("SELinux: user %s: "
1663                                "too deep or looped boundary",
1664                                (char *) key);
1665                         return -EINVAL;
1666                 }
1667
1668                 upper = p->user_val_to_struct[upper->bounds - 1];
1669                 ebitmap_for_each_positive_bit(&user->roles, node, bit) {
1670                         if (ebitmap_get_bit(&upper->roles, bit))
1671                                 continue;
1672
1673                         pr_err("SELinux: boundary violated policy: "
1674                                "user=%s role=%s bounds=%s\n",
1675                                sym_name(p, SYM_USERS, user->value - 1),
1676                                sym_name(p, SYM_ROLES, bit),
1677                                sym_name(p, SYM_USERS, upper->value - 1));
1678
1679                         return -EINVAL;
1680                 }
1681         }
1682
1683         return 0;
1684 }
1685
1686 static int role_bounds_sanity_check(void *key, void *datum, void *datap)
1687 {
1688         struct role_datum *upper, *role;
1689         struct policydb *p = datap;
1690         int depth = 0;
1691
1692         upper = role = datum;
1693         while (upper->bounds) {
1694                 struct ebitmap_node *node;
1695                 unsigned long bit;
1696
1697                 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1698                         pr_err("SELinux: role %s: "
1699                                "too deep or looped bounds\n",
1700                                (char *) key);
1701                         return -EINVAL;
1702                 }
1703
1704                 upper = p->role_val_to_struct[upper->bounds - 1];
1705                 ebitmap_for_each_positive_bit(&role->types, node, bit) {
1706                         if (ebitmap_get_bit(&upper->types, bit))
1707                                 continue;
1708
1709                         pr_err("SELinux: boundary violated policy: "
1710                                "role=%s type=%s bounds=%s\n",
1711                                sym_name(p, SYM_ROLES, role->value - 1),
1712                                sym_name(p, SYM_TYPES, bit),
1713                                sym_name(p, SYM_ROLES, upper->value - 1));
1714
1715                         return -EINVAL;
1716                 }
1717         }
1718
1719         return 0;
1720 }
1721
1722 static int type_bounds_sanity_check(void *key, void *datum, void *datap)
1723 {
1724         struct type_datum *upper;
1725         struct policydb *p = datap;
1726         int depth = 0;
1727
1728         upper = datum;
1729         while (upper->bounds) {
1730                 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1731                         pr_err("SELinux: type %s: "
1732                                "too deep or looped boundary\n",
1733                                (char *) key);
1734                         return -EINVAL;
1735                 }
1736
1737                 upper = p->type_val_to_struct[upper->bounds - 1];
1738                 BUG_ON(!upper);
1739
1740                 if (upper->attribute) {
1741                         pr_err("SELinux: type %s: "
1742                                "bounded by attribute %s",
1743                                (char *) key,
1744                                sym_name(p, SYM_TYPES, upper->value - 1));
1745                         return -EINVAL;
1746                 }
1747         }
1748
1749         return 0;
1750 }
1751
1752 static int policydb_bounds_sanity_check(struct policydb *p)
1753 {
1754         int rc;
1755
1756         if (p->policyvers < POLICYDB_VERSION_BOUNDARY)
1757                 return 0;
1758
1759         rc = hashtab_map(p->p_users.table,
1760                          user_bounds_sanity_check, p);
1761         if (rc)
1762                 return rc;
1763
1764         rc = hashtab_map(p->p_roles.table,
1765                          role_bounds_sanity_check, p);
1766         if (rc)
1767                 return rc;
1768
1769         rc = hashtab_map(p->p_types.table,
1770                          type_bounds_sanity_check, p);
1771         if (rc)
1772                 return rc;
1773
1774         return 0;
1775 }
1776
1777 u16 string_to_security_class(struct policydb *p, const char *name)
1778 {
1779         struct class_datum *cladatum;
1780
1781         cladatum = hashtab_search(p->p_classes.table, name);
1782         if (!cladatum)
1783                 return 0;
1784
1785         return cladatum->value;
1786 }
1787
1788 u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name)
1789 {
1790         struct class_datum *cladatum;
1791         struct perm_datum *perdatum = NULL;
1792         struct common_datum *comdatum;
1793
1794         if (!tclass || tclass > p->p_classes.nprim)
1795                 return 0;
1796
1797         cladatum = p->class_val_to_struct[tclass-1];
1798         comdatum = cladatum->comdatum;
1799         if (comdatum)
1800                 perdatum = hashtab_search(comdatum->permissions.table,
1801                                           name);
1802         if (!perdatum)
1803                 perdatum = hashtab_search(cladatum->permissions.table,
1804                                           name);
1805         if (!perdatum)
1806                 return 0;
1807
1808         return 1U << (perdatum->value-1);
1809 }
1810
1811 static int range_read(struct policydb *p, void *fp)
1812 {
1813         struct range_trans *rt = NULL;
1814         struct mls_range *r = NULL;
1815         int i, rc;
1816         __le32 buf[2];
1817         u32 nel;
1818
1819         if (p->policyvers < POLICYDB_VERSION_MLS)
1820                 return 0;
1821
1822         rc = next_entry(buf, fp, sizeof(u32));
1823         if (rc)
1824                 return rc;
1825
1826         nel = le32_to_cpu(buf[0]);
1827         for (i = 0; i < nel; i++) {
1828                 rc = -ENOMEM;
1829                 rt = kzalloc(sizeof(*rt), GFP_KERNEL);
1830                 if (!rt)
1831                         goto out;
1832
1833                 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1834                 if (rc)
1835                         goto out;
1836
1837                 rt->source_type = le32_to_cpu(buf[0]);
1838                 rt->target_type = le32_to_cpu(buf[1]);
1839                 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
1840                         rc = next_entry(buf, fp, sizeof(u32));
1841                         if (rc)
1842                                 goto out;
1843                         rt->target_class = le32_to_cpu(buf[0]);
1844                 } else
1845                         rt->target_class = p->process_class;
1846
1847                 rc = -EINVAL;
1848                 if (!policydb_type_isvalid(p, rt->source_type) ||
1849                     !policydb_type_isvalid(p, rt->target_type) ||
1850                     !policydb_class_isvalid(p, rt->target_class))
1851                         goto out;
1852
1853                 rc = -ENOMEM;
1854                 r = kzalloc(sizeof(*r), GFP_KERNEL);
1855                 if (!r)
1856                         goto out;
1857
1858                 rc = mls_read_range_helper(r, fp);
1859                 if (rc)
1860                         goto out;
1861
1862                 rc = -EINVAL;
1863                 if (!mls_range_isvalid(p, r)) {
1864                         pr_warn("SELinux:  rangetrans:  invalid range\n");
1865                         goto out;
1866                 }
1867
1868                 rc = hashtab_insert(p->range_tr, rt, r);
1869                 if (rc)
1870                         goto out;
1871
1872                 rt = NULL;
1873                 r = NULL;
1874         }
1875         hash_eval(p->range_tr, "rangetr");
1876         rc = 0;
1877 out:
1878         kfree(rt);
1879         kfree(r);
1880         return rc;
1881 }
1882
1883 static int filename_trans_read(struct policydb *p, void *fp)
1884 {
1885         struct filename_trans *ft;
1886         struct filename_trans_datum *otype;
1887         char *name;
1888         u32 nel, len;
1889         __le32 buf[4];
1890         int rc, i;
1891
1892         if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
1893                 return 0;
1894
1895         rc = next_entry(buf, fp, sizeof(u32));
1896         if (rc)
1897                 return rc;
1898         nel = le32_to_cpu(buf[0]);
1899
1900         for (i = 0; i < nel; i++) {
1901                 otype = NULL;
1902                 name = NULL;
1903
1904                 rc = -ENOMEM;
1905                 ft = kzalloc(sizeof(*ft), GFP_KERNEL);
1906                 if (!ft)
1907                         goto out;
1908
1909                 rc = -ENOMEM;
1910                 otype = kmalloc(sizeof(*otype), GFP_KERNEL);
1911                 if (!otype)
1912                         goto out;
1913
1914                 /* length of the path component string */
1915                 rc = next_entry(buf, fp, sizeof(u32));
1916                 if (rc)
1917                         goto out;
1918                 len = le32_to_cpu(buf[0]);
1919
1920                 /* path component string */
1921                 rc = str_read(&name, GFP_KERNEL, fp, len);
1922                 if (rc)
1923                         goto out;
1924
1925                 ft->name = name;
1926
1927                 rc = next_entry(buf, fp, sizeof(u32) * 4);
1928                 if (rc)
1929                         goto out;
1930
1931                 ft->stype = le32_to_cpu(buf[0]);
1932                 ft->ttype = le32_to_cpu(buf[1]);
1933                 ft->tclass = le32_to_cpu(buf[2]);
1934
1935                 otype->otype = le32_to_cpu(buf[3]);
1936
1937                 rc = ebitmap_set_bit(&p->filename_trans_ttypes, ft->ttype, 1);
1938                 if (rc)
1939                         goto out;
1940
1941                 rc = hashtab_insert(p->filename_trans, ft, otype);
1942                 if (rc) {
1943                         /*
1944                          * Do not return -EEXIST to the caller, or the system
1945                          * will not boot.
1946                          */
1947                         if (rc != -EEXIST)
1948                                 goto out;
1949                         /* But free memory to avoid memory leak. */
1950                         kfree(ft);
1951                         kfree(name);
1952                         kfree(otype);
1953                 }
1954         }
1955         hash_eval(p->filename_trans, "filenametr");
1956         return 0;
1957 out:
1958         kfree(ft);
1959         kfree(name);
1960         kfree(otype);
1961
1962         return rc;
1963 }
1964
1965 static int genfs_read(struct policydb *p, void *fp)
1966 {
1967         int i, j, rc;
1968         u32 nel, nel2, len, len2;
1969         __le32 buf[1];
1970         struct ocontext *l, *c;
1971         struct ocontext *newc = NULL;
1972         struct genfs *genfs_p, *genfs;
1973         struct genfs *newgenfs = NULL;
1974
1975         rc = next_entry(buf, fp, sizeof(u32));
1976         if (rc)
1977                 return rc;
1978         nel = le32_to_cpu(buf[0]);
1979
1980         for (i = 0; i < nel; i++) {
1981                 rc = next_entry(buf, fp, sizeof(u32));
1982                 if (rc)
1983                         goto out;
1984                 len = le32_to_cpu(buf[0]);
1985
1986                 rc = -ENOMEM;
1987                 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
1988                 if (!newgenfs)
1989                         goto out;
1990
1991                 rc = str_read(&newgenfs->fstype, GFP_KERNEL, fp, len);
1992                 if (rc)
1993                         goto out;
1994
1995                 for (genfs_p = NULL, genfs = p->genfs; genfs;
1996                      genfs_p = genfs, genfs = genfs->next) {
1997                         rc = -EINVAL;
1998                         if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
1999                                 pr_err("SELinux:  dup genfs fstype %s\n",
2000                                        newgenfs->fstype);
2001                                 goto out;
2002                         }
2003                         if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
2004                                 break;
2005                 }
2006                 newgenfs->next = genfs;
2007                 if (genfs_p)
2008                         genfs_p->next = newgenfs;
2009                 else
2010                         p->genfs = newgenfs;
2011                 genfs = newgenfs;
2012                 newgenfs = NULL;
2013
2014                 rc = next_entry(buf, fp, sizeof(u32));
2015                 if (rc)
2016                         goto out;
2017
2018                 nel2 = le32_to_cpu(buf[0]);
2019                 for (j = 0; j < nel2; j++) {
2020                         rc = next_entry(buf, fp, sizeof(u32));
2021                         if (rc)
2022                                 goto out;
2023                         len = le32_to_cpu(buf[0]);
2024
2025                         rc = -ENOMEM;
2026                         newc = kzalloc(sizeof(*newc), GFP_KERNEL);
2027                         if (!newc)
2028                                 goto out;
2029
2030                         rc = str_read(&newc->u.name, GFP_KERNEL, fp, len);
2031                         if (rc)
2032                                 goto out;
2033
2034                         rc = next_entry(buf, fp, sizeof(u32));
2035                         if (rc)
2036                                 goto out;
2037
2038                         newc->v.sclass = le32_to_cpu(buf[0]);
2039                         rc = context_read_and_validate(&newc->context[0], p, fp);
2040                         if (rc)
2041                                 goto out;
2042
2043                         for (l = NULL, c = genfs->head; c;
2044                              l = c, c = c->next) {
2045                                 rc = -EINVAL;
2046                                 if (!strcmp(newc->u.name, c->u.name) &&
2047                                     (!c->v.sclass || !newc->v.sclass ||
2048                                      newc->v.sclass == c->v.sclass)) {
2049                                         pr_err("SELinux:  dup genfs entry (%s,%s)\n",
2050                                                genfs->fstype, c->u.name);
2051                                         goto out;
2052                                 }
2053                                 len = strlen(newc->u.name);
2054                                 len2 = strlen(c->u.name);
2055                                 if (len > len2)
2056                                         break;
2057                         }
2058
2059                         newc->next = c;
2060                         if (l)
2061                                 l->next = newc;
2062                         else
2063                                 genfs->head = newc;
2064                         newc = NULL;
2065                 }
2066         }
2067         rc = 0;
2068 out:
2069         if (newgenfs) {
2070                 kfree(newgenfs->fstype);
2071                 kfree(newgenfs);
2072         }
2073         ocontext_destroy(newc, OCON_FSUSE);
2074
2075         return rc;
2076 }
2077
2078 static int ocontext_read(struct policydb *p, struct policydb_compat_info *info,
2079                          void *fp)
2080 {
2081         int i, j, rc;
2082         u32 nel, len;
2083         __be64 prefixbuf[1];
2084         __le32 buf[3];
2085         struct ocontext *l, *c;
2086         u32 nodebuf[8];
2087
2088         for (i = 0; i < info->ocon_num; i++) {
2089                 rc = next_entry(buf, fp, sizeof(u32));
2090                 if (rc)
2091                         goto out;
2092                 nel = le32_to_cpu(buf[0]);
2093
2094                 l = NULL;
2095                 for (j = 0; j < nel; j++) {
2096                         rc = -ENOMEM;
2097                         c = kzalloc(sizeof(*c), GFP_KERNEL);
2098                         if (!c)
2099                                 goto out;
2100                         if (l)
2101                                 l->next = c;
2102                         else
2103                                 p->ocontexts[i] = c;
2104                         l = c;
2105
2106                         switch (i) {
2107                         case OCON_ISID:
2108                                 rc = next_entry(buf, fp, sizeof(u32));
2109                                 if (rc)
2110                                         goto out;
2111
2112                                 c->sid[0] = le32_to_cpu(buf[0]);
2113                                 rc = context_read_and_validate(&c->context[0], p, fp);
2114                                 if (rc)
2115                                         goto out;
2116                                 break;
2117                         case OCON_FS:
2118                         case OCON_NETIF:
2119                                 rc = next_entry(buf, fp, sizeof(u32));
2120                                 if (rc)
2121                                         goto out;
2122                                 len = le32_to_cpu(buf[0]);
2123
2124                                 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2125                                 if (rc)
2126                                         goto out;
2127
2128                                 rc = context_read_and_validate(&c->context[0], p, fp);
2129                                 if (rc)
2130                                         goto out;
2131                                 rc = context_read_and_validate(&c->context[1], p, fp);
2132                                 if (rc)
2133                                         goto out;
2134                                 break;
2135                         case OCON_PORT:
2136                                 rc = next_entry(buf, fp, sizeof(u32)*3);
2137                                 if (rc)
2138                                         goto out;
2139                                 c->u.port.protocol = le32_to_cpu(buf[0]);
2140                                 c->u.port.low_port = le32_to_cpu(buf[1]);
2141                                 c->u.port.high_port = le32_to_cpu(buf[2]);
2142                                 rc = context_read_and_validate(&c->context[0], p, fp);
2143                                 if (rc)
2144                                         goto out;
2145                                 break;
2146                         case OCON_NODE:
2147                                 rc = next_entry(nodebuf, fp, sizeof(u32) * 2);
2148                                 if (rc)
2149                                         goto out;
2150                                 c->u.node.addr = nodebuf[0]; /* network order */
2151                                 c->u.node.mask = nodebuf[1]; /* network order */
2152                                 rc = context_read_and_validate(&c->context[0], p, fp);
2153                                 if (rc)
2154                                         goto out;
2155                                 break;
2156                         case OCON_FSUSE:
2157                                 rc = next_entry(buf, fp, sizeof(u32)*2);
2158                                 if (rc)
2159                                         goto out;
2160
2161                                 rc = -EINVAL;
2162                                 c->v.behavior = le32_to_cpu(buf[0]);
2163                                 /* Determined at runtime, not in policy DB. */
2164                                 if (c->v.behavior == SECURITY_FS_USE_MNTPOINT)
2165                                         goto out;
2166                                 if (c->v.behavior > SECURITY_FS_USE_MAX)
2167                                         goto out;
2168
2169                                 len = le32_to_cpu(buf[1]);
2170                                 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2171                                 if (rc)
2172                                         goto out;
2173
2174                                 rc = context_read_and_validate(&c->context[0], p, fp);
2175                                 if (rc)
2176                                         goto out;
2177                                 break;
2178                         case OCON_NODE6: {
2179                                 int k;
2180
2181                                 rc = next_entry(nodebuf, fp, sizeof(u32) * 8);
2182                                 if (rc)
2183                                         goto out;
2184                                 for (k = 0; k < 4; k++)
2185                                         c->u.node6.addr[k] = nodebuf[k];
2186                                 for (k = 0; k < 4; k++)
2187                                         c->u.node6.mask[k] = nodebuf[k+4];
2188                                 rc = context_read_and_validate(&c->context[0], p, fp);
2189                                 if (rc)
2190                                         goto out;
2191                                 break;
2192                         }
2193                         case OCON_IBPKEY: {
2194                                 u32 pkey_lo, pkey_hi;
2195
2196                                 rc = next_entry(prefixbuf, fp, sizeof(u64));
2197                                 if (rc)
2198                                         goto out;
2199
2200                                 /* we need to have subnet_prefix in CPU order */
2201                                 c->u.ibpkey.subnet_prefix = be64_to_cpu(prefixbuf[0]);
2202
2203                                 rc = next_entry(buf, fp, sizeof(u32) * 2);
2204                                 if (rc)
2205                                         goto out;
2206
2207                                 pkey_lo = le32_to_cpu(buf[0]);
2208                                 pkey_hi = le32_to_cpu(buf[1]);
2209
2210                                 if (pkey_lo > U16_MAX || pkey_hi > U16_MAX) {
2211                                         rc = -EINVAL;
2212                                         goto out;
2213                                 }
2214
2215                                 c->u.ibpkey.low_pkey  = pkey_lo;
2216                                 c->u.ibpkey.high_pkey = pkey_hi;
2217
2218                                 rc = context_read_and_validate(&c->context[0],
2219                                                                p,
2220                                                                fp);
2221                                 if (rc)
2222                                         goto out;
2223                                 break;
2224                         }
2225                         case OCON_IBENDPORT: {
2226                                 u32 port;
2227
2228                                 rc = next_entry(buf, fp, sizeof(u32) * 2);
2229                                 if (rc)
2230                                         goto out;
2231                                 len = le32_to_cpu(buf[0]);
2232
2233                                 rc = str_read(&c->u.ibendport.dev_name, GFP_KERNEL, fp, len);
2234                                 if (rc)
2235                                         goto out;
2236
2237                                 port = le32_to_cpu(buf[1]);
2238                                 if (port > U8_MAX || port == 0) {
2239                                         rc = -EINVAL;
2240                                         goto out;
2241                                 }
2242
2243                                 c->u.ibendport.port = port;
2244
2245                                 rc = context_read_and_validate(&c->context[0],
2246                                                                p,
2247                                                                fp);
2248                                 if (rc)
2249                                         goto out;
2250                                 break;
2251                         } /* end case */
2252                         } /* end switch */
2253                 }
2254         }
2255         rc = 0;
2256 out:
2257         return rc;
2258 }
2259
2260 /*
2261  * Read the configuration data from a policy database binary
2262  * representation file into a policy database structure.
2263  */
2264 int policydb_read(struct policydb *p, void *fp)
2265 {
2266         struct role_allow *ra, *lra;
2267         struct role_trans *tr, *ltr;
2268         int i, j, rc;
2269         __le32 buf[4];
2270         u32 len, nprim, nel;
2271
2272         char *policydb_str;
2273         struct policydb_compat_info *info;
2274
2275         rc = policydb_init(p);
2276         if (rc)
2277                 return rc;
2278
2279         /* Read the magic number and string length. */
2280         rc = next_entry(buf, fp, sizeof(u32) * 2);
2281         if (rc)
2282                 goto bad;
2283
2284         rc = -EINVAL;
2285         if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
2286                 pr_err("SELinux:  policydb magic number 0x%x does "
2287                        "not match expected magic number 0x%x\n",
2288                        le32_to_cpu(buf[0]), POLICYDB_MAGIC);
2289                 goto bad;
2290         }
2291
2292         rc = -EINVAL;
2293         len = le32_to_cpu(buf[1]);
2294         if (len != strlen(POLICYDB_STRING)) {
2295                 pr_err("SELinux:  policydb string length %d does not "
2296                        "match expected length %zu\n",
2297                        len, strlen(POLICYDB_STRING));
2298                 goto bad;
2299         }
2300
2301         rc = -ENOMEM;
2302         policydb_str = kmalloc(len + 1, GFP_KERNEL);
2303         if (!policydb_str) {
2304                 pr_err("SELinux:  unable to allocate memory for policydb "
2305                        "string of length %d\n", len);
2306                 goto bad;
2307         }
2308
2309         rc = next_entry(policydb_str, fp, len);
2310         if (rc) {
2311                 pr_err("SELinux:  truncated policydb string identifier\n");
2312                 kfree(policydb_str);
2313                 goto bad;
2314         }
2315
2316         rc = -EINVAL;
2317         policydb_str[len] = '\0';
2318         if (strcmp(policydb_str, POLICYDB_STRING)) {
2319                 pr_err("SELinux:  policydb string %s does not match "
2320                        "my string %s\n", policydb_str, POLICYDB_STRING);
2321                 kfree(policydb_str);
2322                 goto bad;
2323         }
2324         /* Done with policydb_str. */
2325         kfree(policydb_str);
2326         policydb_str = NULL;
2327
2328         /* Read the version and table sizes. */
2329         rc = next_entry(buf, fp, sizeof(u32)*4);
2330         if (rc)
2331                 goto bad;
2332
2333         rc = -EINVAL;
2334         p->policyvers = le32_to_cpu(buf[0]);
2335         if (p->policyvers < POLICYDB_VERSION_MIN ||
2336             p->policyvers > POLICYDB_VERSION_MAX) {
2337                 pr_err("SELinux:  policydb version %d does not match "
2338                        "my version range %d-%d\n",
2339                        le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
2340                 goto bad;
2341         }
2342
2343         if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
2344                 p->mls_enabled = 1;
2345
2346                 rc = -EINVAL;
2347                 if (p->policyvers < POLICYDB_VERSION_MLS) {
2348                         pr_err("SELinux: security policydb version %d "
2349                                 "(MLS) not backwards compatible\n",
2350                                 p->policyvers);
2351                         goto bad;
2352                 }
2353         }
2354         p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
2355         p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
2356
2357         if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
2358                 rc = ebitmap_read(&p->policycaps, fp);
2359                 if (rc)
2360                         goto bad;
2361         }
2362
2363         if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
2364                 rc = ebitmap_read(&p->permissive_map, fp);
2365                 if (rc)
2366                         goto bad;
2367         }
2368
2369         rc = -EINVAL;
2370         info = policydb_lookup_compat(p->policyvers);
2371         if (!info) {
2372                 pr_err("SELinux:  unable to find policy compat info "
2373                        "for version %d\n", p->policyvers);
2374                 goto bad;
2375         }
2376
2377         rc = -EINVAL;
2378         if (le32_to_cpu(buf[2]) != info->sym_num ||
2379                 le32_to_cpu(buf[3]) != info->ocon_num) {
2380                 pr_err("SELinux:  policydb table sizes (%d,%d) do "
2381                        "not match mine (%d,%d)\n", le32_to_cpu(buf[2]),
2382                         le32_to_cpu(buf[3]),
2383                        info->sym_num, info->ocon_num);
2384                 goto bad;
2385         }
2386
2387         for (i = 0; i < info->sym_num; i++) {
2388                 rc = next_entry(buf, fp, sizeof(u32)*2);
2389                 if (rc)
2390                         goto bad;
2391                 nprim = le32_to_cpu(buf[0]);
2392                 nel = le32_to_cpu(buf[1]);
2393                 for (j = 0; j < nel; j++) {
2394                         rc = read_f[i](p, p->symtab[i].table, fp);
2395                         if (rc)
2396                                 goto bad;
2397                 }
2398
2399                 p->symtab[i].nprim = nprim;
2400         }
2401
2402         rc = -EINVAL;
2403         p->process_class = string_to_security_class(p, "process");
2404         if (!p->process_class)
2405                 goto bad;
2406
2407         rc = avtab_read(&p->te_avtab, fp, p);
2408         if (rc)
2409                 goto bad;
2410
2411         if (p->policyvers >= POLICYDB_VERSION_BOOL) {
2412                 rc = cond_read_list(p, fp);
2413                 if (rc)
2414                         goto bad;
2415         }
2416
2417         rc = next_entry(buf, fp, sizeof(u32));
2418         if (rc)
2419                 goto bad;
2420         nel = le32_to_cpu(buf[0]);
2421         ltr = NULL;
2422         for (i = 0; i < nel; i++) {
2423                 rc = -ENOMEM;
2424                 tr = kzalloc(sizeof(*tr), GFP_KERNEL);
2425                 if (!tr)
2426                         goto bad;
2427                 if (ltr)
2428                         ltr->next = tr;
2429                 else
2430                         p->role_tr = tr;
2431                 rc = next_entry(buf, fp, sizeof(u32)*3);
2432                 if (rc)
2433                         goto bad;
2434
2435                 rc = -EINVAL;
2436                 tr->role = le32_to_cpu(buf[0]);
2437                 tr->type = le32_to_cpu(buf[1]);
2438                 tr->new_role = le32_to_cpu(buf[2]);
2439                 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2440                         rc = next_entry(buf, fp, sizeof(u32));
2441                         if (rc)
2442                                 goto bad;
2443                         tr->tclass = le32_to_cpu(buf[0]);
2444                 } else
2445                         tr->tclass = p->process_class;
2446
2447                 rc = -EINVAL;
2448                 if (!policydb_role_isvalid(p, tr->role) ||
2449                     !policydb_type_isvalid(p, tr->type) ||
2450                     !policydb_class_isvalid(p, tr->tclass) ||
2451                     !policydb_role_isvalid(p, tr->new_role))
2452                         goto bad;
2453                 ltr = tr;
2454         }
2455
2456         rc = next_entry(buf, fp, sizeof(u32));
2457         if (rc)
2458                 goto bad;
2459         nel = le32_to_cpu(buf[0]);
2460         lra = NULL;
2461         for (i = 0; i < nel; i++) {
2462                 rc = -ENOMEM;
2463                 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
2464                 if (!ra)
2465                         goto bad;
2466                 if (lra)
2467                         lra->next = ra;
2468                 else
2469                         p->role_allow = ra;
2470                 rc = next_entry(buf, fp, sizeof(u32)*2);
2471                 if (rc)
2472                         goto bad;
2473
2474                 rc = -EINVAL;
2475                 ra->role = le32_to_cpu(buf[0]);
2476                 ra->new_role = le32_to_cpu(buf[1]);
2477                 if (!policydb_role_isvalid(p, ra->role) ||
2478                     !policydb_role_isvalid(p, ra->new_role))
2479                         goto bad;
2480                 lra = ra;
2481         }
2482
2483         rc = filename_trans_read(p, fp);
2484         if (rc)
2485                 goto bad;
2486
2487         rc = policydb_index(p);
2488         if (rc)
2489                 goto bad;
2490
2491         rc = -EINVAL;
2492         p->process_trans_perms = string_to_av_perm(p, p->process_class, "transition");
2493         p->process_trans_perms |= string_to_av_perm(p, p->process_class, "dyntransition");
2494         if (!p->process_trans_perms)
2495                 goto bad;
2496
2497         rc = ocontext_read(p, info, fp);
2498         if (rc)
2499                 goto bad;
2500
2501         rc = genfs_read(p, fp);
2502         if (rc)
2503                 goto bad;
2504
2505         rc = range_read(p, fp);
2506         if (rc)
2507                 goto bad;
2508
2509         p->type_attr_map_array = kvcalloc(p->p_types.nprim,
2510                                           sizeof(*p->type_attr_map_array),
2511                                           GFP_KERNEL);
2512         if (!p->type_attr_map_array)
2513                 goto bad;
2514
2515         /* just in case ebitmap_init() becomes more than just a memset(0): */
2516         for (i = 0; i < p->p_types.nprim; i++)
2517                 ebitmap_init(&p->type_attr_map_array[i]);
2518
2519         for (i = 0; i < p->p_types.nprim; i++) {
2520                 struct ebitmap *e = &p->type_attr_map_array[i];
2521
2522                 if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
2523                         rc = ebitmap_read(e, fp);
2524                         if (rc)
2525                                 goto bad;
2526                 }
2527                 /* add the type itself as the degenerate case */
2528                 rc = ebitmap_set_bit(e, i, 1);
2529                 if (rc)
2530                         goto bad;
2531         }
2532
2533         rc = policydb_bounds_sanity_check(p);
2534         if (rc)
2535                 goto bad;
2536
2537         rc = 0;
2538 out:
2539         return rc;
2540 bad:
2541         policydb_destroy(p);
2542         goto out;
2543 }
2544
2545 /*
2546  * Write a MLS level structure to a policydb binary
2547  * representation file.
2548  */
2549 static int mls_write_level(struct mls_level *l, void *fp)
2550 {
2551         __le32 buf[1];
2552         int rc;
2553
2554         buf[0] = cpu_to_le32(l->sens);
2555         rc = put_entry(buf, sizeof(u32), 1, fp);
2556         if (rc)
2557                 return rc;
2558
2559         rc = ebitmap_write(&l->cat, fp);
2560         if (rc)
2561                 return rc;
2562
2563         return 0;
2564 }
2565
2566 /*
2567  * Write a MLS range structure to a policydb binary
2568  * representation file.
2569  */
2570 static int mls_write_range_helper(struct mls_range *r, void *fp)
2571 {
2572         __le32 buf[3];
2573         size_t items;
2574         int rc, eq;
2575
2576         eq = mls_level_eq(&r->level[1], &r->level[0]);
2577
2578         if (eq)
2579                 items = 2;
2580         else
2581                 items = 3;
2582         buf[0] = cpu_to_le32(items-1);
2583         buf[1] = cpu_to_le32(r->level[0].sens);
2584         if (!eq)
2585                 buf[2] = cpu_to_le32(r->level[1].sens);
2586
2587         BUG_ON(items > ARRAY_SIZE(buf));
2588
2589         rc = put_entry(buf, sizeof(u32), items, fp);
2590         if (rc)
2591                 return rc;
2592
2593         rc = ebitmap_write(&r->level[0].cat, fp);
2594         if (rc)
2595                 return rc;
2596         if (!eq) {
2597                 rc = ebitmap_write(&r->level[1].cat, fp);
2598                 if (rc)
2599                         return rc;
2600         }
2601
2602         return 0;
2603 }
2604
2605 static int sens_write(void *vkey, void *datum, void *ptr)
2606 {
2607         char *key = vkey;
2608         struct level_datum *levdatum = datum;
2609         struct policy_data *pd = ptr;
2610         void *fp = pd->fp;
2611         __le32 buf[2];
2612         size_t len;
2613         int rc;
2614
2615         len = strlen(key);
2616         buf[0] = cpu_to_le32(len);
2617         buf[1] = cpu_to_le32(levdatum->isalias);
2618         rc = put_entry(buf, sizeof(u32), 2, fp);
2619         if (rc)
2620                 return rc;
2621
2622         rc = put_entry(key, 1, len, fp);
2623         if (rc)
2624                 return rc;
2625
2626         rc = mls_write_level(levdatum->level, fp);
2627         if (rc)
2628                 return rc;
2629
2630         return 0;
2631 }
2632
2633 static int cat_write(void *vkey, void *datum, void *ptr)
2634 {
2635         char *key = vkey;
2636         struct cat_datum *catdatum = datum;
2637         struct policy_data *pd = ptr;
2638         void *fp = pd->fp;
2639         __le32 buf[3];
2640         size_t len;
2641         int rc;
2642
2643         len = strlen(key);
2644         buf[0] = cpu_to_le32(len);
2645         buf[1] = cpu_to_le32(catdatum->value);
2646         buf[2] = cpu_to_le32(catdatum->isalias);
2647         rc = put_entry(buf, sizeof(u32), 3, fp);
2648         if (rc)
2649                 return rc;
2650
2651         rc = put_entry(key, 1, len, fp);
2652         if (rc)
2653                 return rc;
2654
2655         return 0;
2656 }
2657
2658 static int role_trans_write(struct policydb *p, void *fp)
2659 {
2660         struct role_trans *r = p->role_tr;
2661         struct role_trans *tr;
2662         __le32 buf[3];
2663         size_t nel;
2664         int rc;
2665
2666         nel = 0;
2667         for (tr = r; tr; tr = tr->next)
2668                 nel++;
2669         buf[0] = cpu_to_le32(nel);
2670         rc = put_entry(buf, sizeof(u32), 1, fp);
2671         if (rc)
2672                 return rc;
2673         for (tr = r; tr; tr = tr->next) {
2674                 buf[0] = cpu_to_le32(tr->role);
2675                 buf[1] = cpu_to_le32(tr->type);
2676                 buf[2] = cpu_to_le32(tr->new_role);
2677                 rc = put_entry(buf, sizeof(u32), 3, fp);
2678                 if (rc)
2679                         return rc;
2680                 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2681                         buf[0] = cpu_to_le32(tr->tclass);
2682                         rc = put_entry(buf, sizeof(u32), 1, fp);
2683                         if (rc)
2684                                 return rc;
2685                 }
2686         }
2687
2688         return 0;
2689 }
2690
2691 static int role_allow_write(struct role_allow *r, void *fp)
2692 {
2693         struct role_allow *ra;
2694         __le32 buf[2];
2695         size_t nel;
2696         int rc;
2697
2698         nel = 0;
2699         for (ra = r; ra; ra = ra->next)
2700                 nel++;
2701         buf[0] = cpu_to_le32(nel);
2702         rc = put_entry(buf, sizeof(u32), 1, fp);
2703         if (rc)
2704                 return rc;
2705         for (ra = r; ra; ra = ra->next) {
2706                 buf[0] = cpu_to_le32(ra->role);
2707                 buf[1] = cpu_to_le32(ra->new_role);
2708                 rc = put_entry(buf, sizeof(u32), 2, fp);
2709                 if (rc)
2710                         return rc;
2711         }
2712         return 0;
2713 }
2714
2715 /*
2716  * Write a security context structure
2717  * to a policydb binary representation file.
2718  */
2719 static int context_write(struct policydb *p, struct context *c,
2720                          void *fp)
2721 {
2722         int rc;
2723         __le32 buf[3];
2724
2725         buf[0] = cpu_to_le32(c->user);
2726         buf[1] = cpu_to_le32(c->role);
2727         buf[2] = cpu_to_le32(c->type);
2728
2729         rc = put_entry(buf, sizeof(u32), 3, fp);
2730         if (rc)
2731                 return rc;
2732
2733         rc = mls_write_range_helper(&c->range, fp);
2734         if (rc)
2735                 return rc;
2736
2737         return 0;
2738 }
2739
2740 /*
2741  * The following *_write functions are used to
2742  * write the symbol data to a policy database
2743  * binary representation file.
2744  */
2745
2746 static int perm_write(void *vkey, void *datum, void *fp)
2747 {
2748         char *key = vkey;
2749         struct perm_datum *perdatum = datum;
2750         __le32 buf[2];
2751         size_t len;
2752         int rc;
2753
2754         len = strlen(key);
2755         buf[0] = cpu_to_le32(len);
2756         buf[1] = cpu_to_le32(perdatum->value);
2757         rc = put_entry(buf, sizeof(u32), 2, fp);
2758         if (rc)
2759                 return rc;
2760
2761         rc = put_entry(key, 1, len, fp);
2762         if (rc)
2763                 return rc;
2764
2765         return 0;
2766 }
2767
2768 static int common_write(void *vkey, void *datum, void *ptr)
2769 {
2770         char *key = vkey;
2771         struct common_datum *comdatum = datum;
2772         struct policy_data *pd = ptr;
2773         void *fp = pd->fp;
2774         __le32 buf[4];
2775         size_t len;
2776         int rc;
2777
2778         len = strlen(key);
2779         buf[0] = cpu_to_le32(len);
2780         buf[1] = cpu_to_le32(comdatum->value);
2781         buf[2] = cpu_to_le32(comdatum->permissions.nprim);
2782         buf[3] = cpu_to_le32(comdatum->permissions.table->nel);
2783         rc = put_entry(buf, sizeof(u32), 4, fp);
2784         if (rc)
2785                 return rc;
2786
2787         rc = put_entry(key, 1, len, fp);
2788         if (rc)
2789                 return rc;
2790
2791         rc = hashtab_map(comdatum->permissions.table, perm_write, fp);
2792         if (rc)
2793                 return rc;
2794
2795         return 0;
2796 }
2797
2798 static int type_set_write(struct type_set *t, void *fp)
2799 {
2800         int rc;
2801         __le32 buf[1];
2802
2803         if (ebitmap_write(&t->types, fp))
2804                 return -EINVAL;
2805         if (ebitmap_write(&t->negset, fp))
2806                 return -EINVAL;
2807
2808         buf[0] = cpu_to_le32(t->flags);
2809         rc = put_entry(buf, sizeof(u32), 1, fp);
2810         if (rc)
2811                 return -EINVAL;
2812
2813         return 0;
2814 }
2815
2816 static int write_cons_helper(struct policydb *p, struct constraint_node *node,
2817                              void *fp)
2818 {
2819         struct constraint_node *c;
2820         struct constraint_expr *e;
2821         __le32 buf[3];
2822         u32 nel;
2823         int rc;
2824
2825         for (c = node; c; c = c->next) {
2826                 nel = 0;
2827                 for (e = c->expr; e; e = e->next)
2828                         nel++;
2829                 buf[0] = cpu_to_le32(c->permissions);
2830                 buf[1] = cpu_to_le32(nel);
2831                 rc = put_entry(buf, sizeof(u32), 2, fp);
2832                 if (rc)
2833                         return rc;
2834                 for (e = c->expr; e; e = e->next) {
2835                         buf[0] = cpu_to_le32(e->expr_type);
2836                         buf[1] = cpu_to_le32(e->attr);
2837                         buf[2] = cpu_to_le32(e->op);
2838                         rc = put_entry(buf, sizeof(u32), 3, fp);
2839                         if (rc)
2840                                 return rc;
2841
2842                         switch (e->expr_type) {
2843                         case CEXPR_NAMES:
2844                                 rc = ebitmap_write(&e->names, fp);
2845                                 if (rc)
2846                                         return rc;
2847                                 if (p->policyvers >=
2848                                         POLICYDB_VERSION_CONSTRAINT_NAMES) {
2849                                         rc = type_set_write(e->type_names, fp);
2850                                         if (rc)
2851                                                 return rc;
2852                                 }
2853                                 break;
2854                         default:
2855                                 break;
2856                         }
2857                 }
2858         }
2859
2860         return 0;
2861 }
2862
2863 static int class_write(void *vkey, void *datum, void *ptr)
2864 {
2865         char *key = vkey;
2866         struct class_datum *cladatum = datum;
2867         struct policy_data *pd = ptr;
2868         void *fp = pd->fp;
2869         struct policydb *p = pd->p;
2870         struct constraint_node *c;
2871         __le32 buf[6];
2872         u32 ncons;
2873         size_t len, len2;
2874         int rc;
2875
2876         len = strlen(key);
2877         if (cladatum->comkey)
2878                 len2 = strlen(cladatum->comkey);
2879         else
2880                 len2 = 0;
2881
2882         ncons = 0;
2883         for (c = cladatum->constraints; c; c = c->next)
2884                 ncons++;
2885
2886         buf[0] = cpu_to_le32(len);
2887         buf[1] = cpu_to_le32(len2);
2888         buf[2] = cpu_to_le32(cladatum->value);
2889         buf[3] = cpu_to_le32(cladatum->permissions.nprim);
2890         if (cladatum->permissions.table)
2891                 buf[4] = cpu_to_le32(cladatum->permissions.table->nel);
2892         else
2893                 buf[4] = 0;
2894         buf[5] = cpu_to_le32(ncons);
2895         rc = put_entry(buf, sizeof(u32), 6, fp);
2896         if (rc)
2897                 return rc;
2898
2899         rc = put_entry(key, 1, len, fp);
2900         if (rc)
2901                 return rc;
2902
2903         if (cladatum->comkey) {
2904                 rc = put_entry(cladatum->comkey, 1, len2, fp);
2905                 if (rc)
2906                         return rc;
2907         }
2908
2909         rc = hashtab_map(cladatum->permissions.table, perm_write, fp);
2910         if (rc)
2911                 return rc;
2912
2913         rc = write_cons_helper(p, cladatum->constraints, fp);
2914         if (rc)
2915                 return rc;
2916
2917         /* write out the validatetrans rule */
2918         ncons = 0;
2919         for (c = cladatum->validatetrans; c; c = c->next)
2920                 ncons++;
2921
2922         buf[0] = cpu_to_le32(ncons);
2923         rc = put_entry(buf, sizeof(u32), 1, fp);
2924         if (rc)
2925                 return rc;
2926
2927         rc = write_cons_helper(p, cladatum->validatetrans, fp);
2928         if (rc)
2929                 return rc;
2930
2931         if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
2932                 buf[0] = cpu_to_le32(cladatum->default_user);
2933                 buf[1] = cpu_to_le32(cladatum->default_role);
2934                 buf[2] = cpu_to_le32(cladatum->default_range);
2935
2936                 rc = put_entry(buf, sizeof(uint32_t), 3, fp);
2937                 if (rc)
2938                         return rc;
2939         }
2940
2941         if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
2942                 buf[0] = cpu_to_le32(cladatum->default_type);
2943                 rc = put_entry(buf, sizeof(uint32_t), 1, fp);
2944                 if (rc)
2945                         return rc;
2946         }
2947
2948         return 0;
2949 }
2950
2951 static int role_write(void *vkey, void *datum, void *ptr)
2952 {
2953         char *key = vkey;
2954         struct role_datum *role = datum;
2955         struct policy_data *pd = ptr;
2956         void *fp = pd->fp;
2957         struct policydb *p = pd->p;
2958         __le32 buf[3];
2959         size_t items, len;
2960         int rc;
2961
2962         len = strlen(key);
2963         items = 0;
2964         buf[items++] = cpu_to_le32(len);
2965         buf[items++] = cpu_to_le32(role->value);
2966         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
2967                 buf[items++] = cpu_to_le32(role->bounds);
2968
2969         BUG_ON(items > ARRAY_SIZE(buf));
2970
2971         rc = put_entry(buf, sizeof(u32), items, fp);
2972         if (rc)
2973                 return rc;
2974
2975         rc = put_entry(key, 1, len, fp);
2976         if (rc)
2977                 return rc;
2978
2979         rc = ebitmap_write(&role->dominates, fp);
2980         if (rc)
2981                 return rc;
2982
2983         rc = ebitmap_write(&role->types, fp);
2984         if (rc)
2985                 return rc;
2986
2987         return 0;
2988 }
2989
2990 static int type_write(void *vkey, void *datum, void *ptr)
2991 {
2992         char *key = vkey;
2993         struct type_datum *typdatum = datum;
2994         struct policy_data *pd = ptr;
2995         struct policydb *p = pd->p;
2996         void *fp = pd->fp;
2997         __le32 buf[4];
2998         int rc;
2999         size_t items, len;
3000
3001         len = strlen(key);
3002         items = 0;
3003         buf[items++] = cpu_to_le32(len);
3004         buf[items++] = cpu_to_le32(typdatum->value);
3005         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
3006                 u32 properties = 0;
3007
3008                 if (typdatum->primary)
3009                         properties |= TYPEDATUM_PROPERTY_PRIMARY;
3010
3011                 if (typdatum->attribute)
3012                         properties |= TYPEDATUM_PROPERTY_ATTRIBUTE;
3013
3014                 buf[items++] = cpu_to_le32(properties);
3015                 buf[items++] = cpu_to_le32(typdatum->bounds);
3016         } else {
3017                 buf[items++] = cpu_to_le32(typdatum->primary);
3018         }
3019         BUG_ON(items > ARRAY_SIZE(buf));
3020         rc = put_entry(buf, sizeof(u32), items, fp);
3021         if (rc)
3022                 return rc;
3023
3024         rc = put_entry(key, 1, len, fp);
3025         if (rc)
3026                 return rc;
3027
3028         return 0;
3029 }
3030
3031 static int user_write(void *vkey, void *datum, void *ptr)
3032 {
3033         char *key = vkey;
3034         struct user_datum *usrdatum = datum;
3035         struct policy_data *pd = ptr;
3036         struct policydb *p = pd->p;
3037         void *fp = pd->fp;
3038         __le32 buf[3];
3039         size_t items, len;
3040         int rc;
3041
3042         len = strlen(key);
3043         items = 0;
3044         buf[items++] = cpu_to_le32(len);
3045         buf[items++] = cpu_to_le32(usrdatum->value);
3046         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
3047                 buf[items++] = cpu_to_le32(usrdatum->bounds);
3048         BUG_ON(items > ARRAY_SIZE(buf));
3049         rc = put_entry(buf, sizeof(u32), items, fp);
3050         if (rc)
3051                 return rc;
3052
3053         rc = put_entry(key, 1, len, fp);
3054         if (rc)
3055                 return rc;
3056
3057         rc = ebitmap_write(&usrdatum->roles, fp);
3058         if (rc)
3059                 return rc;
3060
3061         rc = mls_write_range_helper(&usrdatum->range, fp);
3062         if (rc)
3063                 return rc;
3064
3065         rc = mls_write_level(&usrdatum->dfltlevel, fp);
3066         if (rc)
3067                 return rc;
3068
3069         return 0;
3070 }
3071
3072 static int (*write_f[SYM_NUM]) (void *key, void *datum,
3073                                 void *datap) =
3074 {
3075         common_write,
3076         class_write,
3077         role_write,
3078         type_write,
3079         user_write,
3080         cond_write_bool,
3081         sens_write,
3082         cat_write,
3083 };
3084
3085 static int ocontext_write(struct policydb *p, struct policydb_compat_info *info,
3086                           void *fp)
3087 {
3088         unsigned int i, j, rc;
3089         size_t nel, len;
3090         __be64 prefixbuf[1];
3091         __le32 buf[3];
3092         u32 nodebuf[8];
3093         struct ocontext *c;
3094         for (i = 0; i < info->ocon_num; i++) {
3095                 nel = 0;
3096                 for (c = p->ocontexts[i]; c; c = c->next)
3097                         nel++;
3098                 buf[0] = cpu_to_le32(nel);
3099                 rc = put_entry(buf, sizeof(u32), 1, fp);
3100                 if (rc)
3101                         return rc;
3102                 for (c = p->ocontexts[i]; c; c = c->next) {
3103                         switch (i) {
3104                         case OCON_ISID:
3105                                 buf[0] = cpu_to_le32(c->sid[0]);
3106                                 rc = put_entry(buf, sizeof(u32), 1, fp);
3107                                 if (rc)
3108                                         return rc;
3109                                 rc = context_write(p, &c->context[0], fp);
3110                                 if (rc)
3111                                         return rc;
3112                                 break;
3113                         case OCON_FS:
3114                         case OCON_NETIF:
3115                                 len = strlen(c->u.name);
3116                                 buf[0] = cpu_to_le32(len);
3117                                 rc = put_entry(buf, sizeof(u32), 1, fp);
3118                                 if (rc)
3119                                         return rc;
3120                                 rc = put_entry(c->u.name, 1, len, fp);
3121                                 if (rc)
3122                                         return rc;
3123                                 rc = context_write(p, &c->context[0], fp);
3124                                 if (rc)
3125                                         return rc;
3126                                 rc = context_write(p, &c->context[1], fp);
3127                                 if (rc)
3128                                         return rc;
3129                                 break;
3130                         case OCON_PORT:
3131                                 buf[0] = cpu_to_le32(c->u.port.protocol);
3132                                 buf[1] = cpu_to_le32(c->u.port.low_port);
3133                                 buf[2] = cpu_to_le32(c->u.port.high_port);
3134                                 rc = put_entry(buf, sizeof(u32), 3, fp);
3135                                 if (rc)
3136                                         return rc;
3137                                 rc = context_write(p, &c->context[0], fp);
3138                                 if (rc)
3139                                         return rc;
3140                                 break;
3141                         case OCON_NODE:
3142                                 nodebuf[0] = c->u.node.addr; /* network order */
3143                                 nodebuf[1] = c->u.node.mask; /* network order */
3144                                 rc = put_entry(nodebuf, sizeof(u32), 2, fp);
3145                                 if (rc)
3146                                         return rc;
3147                                 rc = context_write(p, &c->context[0], fp);
3148                                 if (rc)
3149                                         return rc;
3150                                 break;
3151                         case OCON_FSUSE:
3152                                 buf[0] = cpu_to_le32(c->v.behavior);
3153                                 len = strlen(c->u.name);
3154                                 buf[1] = cpu_to_le32(len);
3155                                 rc = put_entry(buf, sizeof(u32), 2, fp);
3156                                 if (rc)
3157                                         return rc;
3158                                 rc = put_entry(c->u.name, 1, len, fp);
3159                                 if (rc)
3160                                         return rc;
3161                                 rc = context_write(p, &c->context[0], fp);
3162                                 if (rc)
3163                                         return rc;
3164                                 break;
3165                         case OCON_NODE6:
3166                                 for (j = 0; j < 4; j++)
3167                                         nodebuf[j] = c->u.node6.addr[j]; /* network order */
3168                                 for (j = 0; j < 4; j++)
3169                                         nodebuf[j + 4] = c->u.node6.mask[j]; /* network order */
3170                                 rc = put_entry(nodebuf, sizeof(u32), 8, fp);
3171                                 if (rc)
3172                                         return rc;
3173                                 rc = context_write(p, &c->context[0], fp);
3174                                 if (rc)
3175                                         return rc;
3176                                 break;
3177                         case OCON_IBPKEY:
3178                                 /* subnet_prefix is in CPU order */
3179                                 prefixbuf[0] = cpu_to_be64(c->u.ibpkey.subnet_prefix);
3180
3181                                 rc = put_entry(prefixbuf, sizeof(u64), 1, fp);
3182                                 if (rc)
3183                                         return rc;
3184
3185                                 buf[0] = cpu_to_le32(c->u.ibpkey.low_pkey);
3186                                 buf[1] = cpu_to_le32(c->u.ibpkey.high_pkey);
3187
3188                                 rc = put_entry(buf, sizeof(u32), 2, fp);
3189                                 if (rc)
3190                                         return rc;
3191                                 rc = context_write(p, &c->context[0], fp);
3192                                 if (rc)
3193                                         return rc;
3194                                 break;
3195                         case OCON_IBENDPORT:
3196                                 len = strlen(c->u.ibendport.dev_name);
3197                                 buf[0] = cpu_to_le32(len);
3198                                 buf[1] = cpu_to_le32(c->u.ibendport.port);
3199                                 rc = put_entry(buf, sizeof(u32), 2, fp);
3200                                 if (rc)
3201                                         return rc;
3202                                 rc = put_entry(c->u.ibendport.dev_name, 1, len, fp);
3203                                 if (rc)
3204                                         return rc;
3205                                 rc = context_write(p, &c->context[0], fp);
3206                                 if (rc)
3207                                         return rc;
3208                                 break;
3209                         }
3210                 }
3211         }
3212         return 0;
3213 }
3214
3215 static int genfs_write(struct policydb *p, void *fp)
3216 {
3217         struct genfs *genfs;
3218         struct ocontext *c;
3219         size_t len;
3220         __le32 buf[1];
3221         int rc;
3222
3223         len = 0;
3224         for (genfs = p->genfs; genfs; genfs = genfs->next)
3225                 len++;
3226         buf[0] = cpu_to_le32(len);
3227         rc = put_entry(buf, sizeof(u32), 1, fp);
3228         if (rc)
3229                 return rc;
3230         for (genfs = p->genfs; genfs; genfs = genfs->next) {
3231                 len = strlen(genfs->fstype);
3232                 buf[0] = cpu_to_le32(len);
3233                 rc = put_entry(buf, sizeof(u32), 1, fp);
3234                 if (rc)
3235                         return rc;
3236                 rc = put_entry(genfs->fstype, 1, len, fp);
3237                 if (rc)
3238                         return rc;
3239                 len = 0;
3240                 for (c = genfs->head; c; c = c->next)
3241                         len++;
3242                 buf[0] = cpu_to_le32(len);
3243                 rc = put_entry(buf, sizeof(u32), 1, fp);
3244                 if (rc)
3245                         return rc;
3246                 for (c = genfs->head; c; c = c->next) {
3247                         len = strlen(c->u.name);
3248                         buf[0] = cpu_to_le32(len);
3249                         rc = put_entry(buf, sizeof(u32), 1, fp);
3250                         if (rc)
3251                                 return rc;
3252                         rc = put_entry(c->u.name, 1, len, fp);
3253                         if (rc)
3254                                 return rc;
3255                         buf[0] = cpu_to_le32(c->v.sclass);
3256                         rc = put_entry(buf, sizeof(u32), 1, fp);
3257                         if (rc)
3258                                 return rc;
3259                         rc = context_write(p, &c->context[0], fp);
3260                         if (rc)
3261                                 return rc;
3262                 }
3263         }
3264         return 0;
3265 }
3266
3267 static int hashtab_cnt(void *key, void *data, void *ptr)
3268 {
3269         int *cnt = ptr;
3270         *cnt = *cnt + 1;
3271
3272         return 0;
3273 }
3274
3275 static int range_write_helper(void *key, void *data, void *ptr)
3276 {
3277         __le32 buf[2];
3278         struct range_trans *rt = key;
3279         struct mls_range *r = data;
3280         struct policy_data *pd = ptr;
3281         void *fp = pd->fp;
3282         struct policydb *p = pd->p;
3283         int rc;
3284
3285         buf[0] = cpu_to_le32(rt->source_type);
3286         buf[1] = cpu_to_le32(rt->target_type);
3287         rc = put_entry(buf, sizeof(u32), 2, fp);
3288         if (rc)
3289                 return rc;
3290         if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
3291                 buf[0] = cpu_to_le32(rt->target_class);
3292                 rc = put_entry(buf, sizeof(u32), 1, fp);
3293                 if (rc)
3294                         return rc;
3295         }
3296         rc = mls_write_range_helper(r, fp);
3297         if (rc)
3298                 return rc;
3299
3300         return 0;
3301 }
3302
3303 static int range_write(struct policydb *p, void *fp)
3304 {
3305         __le32 buf[1];
3306         int rc, nel;
3307         struct policy_data pd;
3308
3309         pd.p = p;
3310         pd.fp = fp;
3311
3312         /* count the number of entries in the hashtab */
3313         nel = 0;
3314         rc = hashtab_map(p->range_tr, hashtab_cnt, &nel);
3315         if (rc)
3316                 return rc;
3317
3318         buf[0] = cpu_to_le32(nel);
3319         rc = put_entry(buf, sizeof(u32), 1, fp);
3320         if (rc)
3321                 return rc;
3322
3323         /* actually write all of the entries */
3324         rc = hashtab_map(p->range_tr, range_write_helper, &pd);
3325         if (rc)
3326                 return rc;
3327
3328         return 0;
3329 }
3330
3331 static int filename_write_helper(void *key, void *data, void *ptr)
3332 {
3333         __le32 buf[4];
3334         struct filename_trans *ft = key;
3335         struct filename_trans_datum *otype = data;
3336         void *fp = ptr;
3337         int rc;
3338         u32 len;
3339
3340         len = strlen(ft->name);
3341         buf[0] = cpu_to_le32(len);
3342         rc = put_entry(buf, sizeof(u32), 1, fp);
3343         if (rc)
3344                 return rc;
3345
3346         rc = put_entry(ft->name, sizeof(char), len, fp);
3347         if (rc)
3348                 return rc;
3349
3350         buf[0] = cpu_to_le32(ft->stype);
3351         buf[1] = cpu_to_le32(ft->ttype);
3352         buf[2] = cpu_to_le32(ft->tclass);
3353         buf[3] = cpu_to_le32(otype->otype);
3354
3355         rc = put_entry(buf, sizeof(u32), 4, fp);
3356         if (rc)
3357                 return rc;
3358
3359         return 0;
3360 }
3361
3362 static int filename_trans_write(struct policydb *p, void *fp)
3363 {
3364         u32 nel;
3365         __le32 buf[1];
3366         int rc;
3367
3368         if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
3369                 return 0;
3370
3371         nel = 0;
3372         rc = hashtab_map(p->filename_trans, hashtab_cnt, &nel);
3373         if (rc)
3374                 return rc;
3375
3376         buf[0] = cpu_to_le32(nel);
3377         rc = put_entry(buf, sizeof(u32), 1, fp);
3378         if (rc)
3379                 return rc;
3380
3381         rc = hashtab_map(p->filename_trans, filename_write_helper, fp);
3382         if (rc)
3383                 return rc;
3384
3385         return 0;
3386 }
3387
3388 /*
3389  * Write the configuration data in a policy database
3390  * structure to a policy database binary representation
3391  * file.
3392  */
3393 int policydb_write(struct policydb *p, void *fp)
3394 {
3395         unsigned int i, num_syms;
3396         int rc;
3397         __le32 buf[4];
3398         u32 config;
3399         size_t len;
3400         struct policydb_compat_info *info;
3401
3402         /*
3403          * refuse to write policy older than compressed avtab
3404          * to simplify the writer.  There are other tests dropped
3405          * since we assume this throughout the writer code.  Be
3406          * careful if you ever try to remove this restriction
3407          */
3408         if (p->policyvers < POLICYDB_VERSION_AVTAB) {
3409                 pr_err("SELinux: refusing to write policy version %d."
3410                        "  Because it is less than version %d\n", p->policyvers,
3411                        POLICYDB_VERSION_AVTAB);
3412                 return -EINVAL;
3413         }
3414
3415         config = 0;
3416         if (p->mls_enabled)
3417                 config |= POLICYDB_CONFIG_MLS;
3418
3419         if (p->reject_unknown)
3420                 config |= REJECT_UNKNOWN;
3421         if (p->allow_unknown)
3422                 config |= ALLOW_UNKNOWN;
3423
3424         /* Write the magic number and string identifiers. */
3425         buf[0] = cpu_to_le32(POLICYDB_MAGIC);
3426         len = strlen(POLICYDB_STRING);
3427         buf[1] = cpu_to_le32(len);
3428         rc = put_entry(buf, sizeof(u32), 2, fp);
3429         if (rc)
3430                 return rc;
3431         rc = put_entry(POLICYDB_STRING, 1, len, fp);
3432         if (rc)
3433                 return rc;
3434
3435         /* Write the version, config, and table sizes. */
3436         info = policydb_lookup_compat(p->policyvers);
3437         if (!info) {
3438                 pr_err("SELinux: compatibility lookup failed for policy "
3439                     "version %d", p->policyvers);
3440                 return -EINVAL;
3441         }
3442
3443         buf[0] = cpu_to_le32(p->policyvers);
3444         buf[1] = cpu_to_le32(config);
3445         buf[2] = cpu_to_le32(info->sym_num);
3446         buf[3] = cpu_to_le32(info->ocon_num);
3447
3448         rc = put_entry(buf, sizeof(u32), 4, fp);
3449         if (rc)
3450                 return rc;
3451
3452         if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
3453                 rc = ebitmap_write(&p->policycaps, fp);
3454                 if (rc)
3455                         return rc;
3456         }
3457
3458         if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
3459                 rc = ebitmap_write(&p->permissive_map, fp);
3460                 if (rc)
3461                         return rc;
3462         }
3463
3464         num_syms = info->sym_num;
3465         for (i = 0; i < num_syms; i++) {
3466                 struct policy_data pd;
3467
3468                 pd.fp = fp;
3469                 pd.p = p;
3470
3471                 buf[0] = cpu_to_le32(p->symtab[i].nprim);
3472                 buf[1] = cpu_to_le32(p->symtab[i].table->nel);
3473
3474                 rc = put_entry(buf, sizeof(u32), 2, fp);
3475                 if (rc)
3476                         return rc;
3477                 rc = hashtab_map(p->symtab[i].table, write_f[i], &pd);
3478                 if (rc)
3479                         return rc;
3480         }
3481
3482         rc = avtab_write(p, &p->te_avtab, fp);
3483         if (rc)
3484                 return rc;
3485
3486         rc = cond_write_list(p, p->cond_list, fp);
3487         if (rc)
3488                 return rc;
3489
3490         rc = role_trans_write(p, fp);
3491         if (rc)
3492                 return rc;
3493
3494         rc = role_allow_write(p->role_allow, fp);
3495         if (rc)
3496                 return rc;
3497
3498         rc = filename_trans_write(p, fp);
3499         if (rc)
3500                 return rc;
3501
3502         rc = ocontext_write(p, info, fp);
3503         if (rc)
3504                 return rc;
3505
3506         rc = genfs_write(p, fp);
3507         if (rc)
3508                 return rc;
3509
3510         rc = range_write(p, fp);
3511         if (rc)
3512                 return rc;
3513
3514         for (i = 0; i < p->p_types.nprim; i++) {
3515                 struct ebitmap *e = &p->type_attr_map_array[i];
3516
3517                 rc = ebitmap_write(e, fp);
3518                 if (rc)
3519                         return rc;
3520         }
3521
3522         return 0;
3523 }