1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Implementation of the policy database. 4 * 5 * Author : Stephen Smalley, <stephen.smalley.work@gmail.com> 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 #ifdef CONFIG_SECURITY_SELINUX_DEBUG 45 static const char *const symtab_name[SYM_NUM] = { 46 "common prefixes", 47 "classes", 48 "roles", 49 "types", 50 "users", 51 "bools", 52 "levels", 53 "categories", 54 }; 55 #endif 56 57 struct policydb_compat_info { 58 unsigned int version; 59 unsigned int sym_num; 60 unsigned int ocon_num; 61 }; 62 63 /* These need to be updated if SYM_NUM or OCON_NUM changes */ 64 static const struct policydb_compat_info policydb_compat[] = { 65 { 66 .version = POLICYDB_VERSION_BASE, 67 .sym_num = SYM_NUM - 3, 68 .ocon_num = OCON_NUM - 3, 69 }, 70 { 71 .version = POLICYDB_VERSION_BOOL, 72 .sym_num = SYM_NUM - 2, 73 .ocon_num = OCON_NUM - 3, 74 }, 75 { 76 .version = POLICYDB_VERSION_IPV6, 77 .sym_num = SYM_NUM - 2, 78 .ocon_num = OCON_NUM - 2, 79 }, 80 { 81 .version = POLICYDB_VERSION_NLCLASS, 82 .sym_num = SYM_NUM - 2, 83 .ocon_num = OCON_NUM - 2, 84 }, 85 { 86 .version = POLICYDB_VERSION_MLS, 87 .sym_num = SYM_NUM, 88 .ocon_num = OCON_NUM - 2, 89 }, 90 { 91 .version = POLICYDB_VERSION_AVTAB, 92 .sym_num = SYM_NUM, 93 .ocon_num = OCON_NUM - 2, 94 }, 95 { 96 .version = POLICYDB_VERSION_RANGETRANS, 97 .sym_num = SYM_NUM, 98 .ocon_num = OCON_NUM - 2, 99 }, 100 { 101 .version = POLICYDB_VERSION_POLCAP, 102 .sym_num = SYM_NUM, 103 .ocon_num = OCON_NUM - 2, 104 }, 105 { 106 .version = POLICYDB_VERSION_PERMISSIVE, 107 .sym_num = SYM_NUM, 108 .ocon_num = OCON_NUM - 2, 109 }, 110 { 111 .version = POLICYDB_VERSION_BOUNDARY, 112 .sym_num = SYM_NUM, 113 .ocon_num = OCON_NUM - 2, 114 }, 115 { 116 .version = POLICYDB_VERSION_FILENAME_TRANS, 117 .sym_num = SYM_NUM, 118 .ocon_num = OCON_NUM - 2, 119 }, 120 { 121 .version = POLICYDB_VERSION_ROLETRANS, 122 .sym_num = SYM_NUM, 123 .ocon_num = OCON_NUM - 2, 124 }, 125 { 126 .version = POLICYDB_VERSION_NEW_OBJECT_DEFAULTS, 127 .sym_num = SYM_NUM, 128 .ocon_num = OCON_NUM - 2, 129 }, 130 { 131 .version = POLICYDB_VERSION_DEFAULT_TYPE, 132 .sym_num = SYM_NUM, 133 .ocon_num = OCON_NUM - 2, 134 }, 135 { 136 .version = POLICYDB_VERSION_CONSTRAINT_NAMES, 137 .sym_num = SYM_NUM, 138 .ocon_num = OCON_NUM - 2, 139 }, 140 { 141 .version = POLICYDB_VERSION_XPERMS_IOCTL, 142 .sym_num = SYM_NUM, 143 .ocon_num = OCON_NUM - 2, 144 }, 145 { 146 .version = POLICYDB_VERSION_INFINIBAND, 147 .sym_num = SYM_NUM, 148 .ocon_num = OCON_NUM, 149 }, 150 { 151 .version = POLICYDB_VERSION_GLBLUB, 152 .sym_num = SYM_NUM, 153 .ocon_num = OCON_NUM, 154 }, 155 { 156 .version = POLICYDB_VERSION_COMP_FTRANS, 157 .sym_num = SYM_NUM, 158 .ocon_num = OCON_NUM, 159 }, 160 }; 161 162 static const struct policydb_compat_info *policydb_lookup_compat(unsigned int version) 163 { 164 unsigned int i; 165 166 for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) { 167 if (policydb_compat[i].version == version) 168 return &policydb_compat[i]; 169 } 170 171 return NULL; 172 } 173 174 /* 175 * The following *_destroy functions are used to 176 * free any memory allocated for each kind of 177 * symbol data in the policy database. 178 */ 179 180 static int perm_destroy(void *key, void *datum, void *p) 181 { 182 kfree(key); 183 kfree(datum); 184 return 0; 185 } 186 187 static int common_destroy(void *key, void *datum, void *p) 188 { 189 struct common_datum *comdatum; 190 191 kfree(key); 192 if (datum) { 193 comdatum = datum; 194 hashtab_map(&comdatum->permissions.table, perm_destroy, NULL); 195 hashtab_destroy(&comdatum->permissions.table); 196 } 197 kfree(datum); 198 return 0; 199 } 200 201 static void constraint_expr_destroy(struct constraint_expr *expr) 202 { 203 if (expr) { 204 ebitmap_destroy(&expr->names); 205 if (expr->type_names) { 206 ebitmap_destroy(&expr->type_names->types); 207 ebitmap_destroy(&expr->type_names->negset); 208 kfree(expr->type_names); 209 } 210 kfree(expr); 211 } 212 } 213 214 static int cls_destroy(void *key, void *datum, void *p) 215 { 216 struct class_datum *cladatum; 217 struct constraint_node *constraint, *ctemp; 218 struct constraint_expr *e, *etmp; 219 220 kfree(key); 221 if (datum) { 222 cladatum = datum; 223 hashtab_map(&cladatum->permissions.table, perm_destroy, NULL); 224 hashtab_destroy(&cladatum->permissions.table); 225 constraint = cladatum->constraints; 226 while (constraint) { 227 e = constraint->expr; 228 while (e) { 229 etmp = e; 230 e = e->next; 231 constraint_expr_destroy(etmp); 232 } 233 ctemp = constraint; 234 constraint = constraint->next; 235 kfree(ctemp); 236 } 237 238 constraint = cladatum->validatetrans; 239 while (constraint) { 240 e = constraint->expr; 241 while (e) { 242 etmp = e; 243 e = e->next; 244 constraint_expr_destroy(etmp); 245 } 246 ctemp = constraint; 247 constraint = constraint->next; 248 kfree(ctemp); 249 } 250 kfree(cladatum->comkey); 251 } 252 kfree(datum); 253 return 0; 254 } 255 256 static int role_destroy(void *key, void *datum, void *p) 257 { 258 struct role_datum *role; 259 260 kfree(key); 261 if (datum) { 262 role = datum; 263 ebitmap_destroy(&role->dominates); 264 ebitmap_destroy(&role->types); 265 } 266 kfree(datum); 267 return 0; 268 } 269 270 static int type_destroy(void *key, void *datum, void *p) 271 { 272 kfree(key); 273 kfree(datum); 274 return 0; 275 } 276 277 static int user_destroy(void *key, void *datum, void *p) 278 { 279 struct user_datum *usrdatum; 280 281 kfree(key); 282 if (datum) { 283 usrdatum = datum; 284 ebitmap_destroy(&usrdatum->roles); 285 ebitmap_destroy(&usrdatum->range.level[0].cat); 286 ebitmap_destroy(&usrdatum->range.level[1].cat); 287 ebitmap_destroy(&usrdatum->dfltlevel.cat); 288 } 289 kfree(datum); 290 return 0; 291 } 292 293 static int sens_destroy(void *key, void *datum, void *p) 294 { 295 struct level_datum *levdatum; 296 297 kfree(key); 298 if (datum) { 299 levdatum = datum; 300 if (levdatum->level) 301 ebitmap_destroy(&levdatum->level->cat); 302 kfree(levdatum->level); 303 } 304 kfree(datum); 305 return 0; 306 } 307 308 static int cat_destroy(void *key, void *datum, void *p) 309 { 310 kfree(key); 311 kfree(datum); 312 return 0; 313 } 314 315 static int (*const destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) = { 316 common_destroy, 317 cls_destroy, 318 role_destroy, 319 type_destroy, 320 user_destroy, 321 cond_destroy_bool, 322 sens_destroy, 323 cat_destroy, 324 }; 325 326 static int filenametr_destroy(void *key, void *datum, void *p) 327 { 328 struct filename_trans_key *ft = key; 329 struct filename_trans_datum *next, *d = datum; 330 331 kfree(ft->name); 332 kfree(key); 333 do { 334 ebitmap_destroy(&d->stypes); 335 next = d->next; 336 kfree(d); 337 d = next; 338 } while (unlikely(d)); 339 cond_resched(); 340 return 0; 341 } 342 343 static int range_tr_destroy(void *key, void *datum, void *p) 344 { 345 struct mls_range *rt = datum; 346 347 kfree(key); 348 ebitmap_destroy(&rt->level[0].cat); 349 ebitmap_destroy(&rt->level[1].cat); 350 kfree(datum); 351 cond_resched(); 352 return 0; 353 } 354 355 static int role_tr_destroy(void *key, void *datum, void *p) 356 { 357 kfree(key); 358 kfree(datum); 359 return 0; 360 } 361 362 static void ocontext_destroy(struct ocontext *c, unsigned int i) 363 { 364 if (!c) 365 return; 366 367 context_destroy(&c->context[0]); 368 context_destroy(&c->context[1]); 369 if (i == OCON_ISID || i == OCON_FS || 370 i == OCON_NETIF || i == OCON_FSUSE) 371 kfree(c->u.name); 372 kfree(c); 373 } 374 375 /* 376 * Initialize the role table. 377 */ 378 static int roles_init(struct policydb *p) 379 { 380 char *key = NULL; 381 int rc; 382 struct role_datum *role; 383 384 role = kzalloc(sizeof(*role), GFP_KERNEL); 385 if (!role) 386 return -ENOMEM; 387 388 rc = -EINVAL; 389 role->value = ++p->p_roles.nprim; 390 if (role->value != OBJECT_R_VAL) 391 goto out; 392 393 rc = -ENOMEM; 394 key = kstrdup(OBJECT_R, GFP_KERNEL); 395 if (!key) 396 goto out; 397 398 rc = symtab_insert(&p->p_roles, key, role); 399 if (rc) 400 goto out; 401 402 return 0; 403 out: 404 kfree(key); 405 kfree(role); 406 return rc; 407 } 408 409 static u32 filenametr_hash(const void *k) 410 { 411 const struct filename_trans_key *ft = k; 412 unsigned long salt = ft->ttype ^ ft->tclass; 413 414 return full_name_hash((void *)salt, ft->name, strlen(ft->name)); 415 } 416 417 static int filenametr_cmp(const void *k1, const void *k2) 418 { 419 const struct filename_trans_key *ft1 = k1; 420 const struct filename_trans_key *ft2 = k2; 421 int v; 422 423 v = ft1->ttype - ft2->ttype; 424 if (v) 425 return v; 426 427 v = ft1->tclass - ft2->tclass; 428 if (v) 429 return v; 430 431 return strcmp(ft1->name, ft2->name); 432 433 } 434 435 static const struct hashtab_key_params filenametr_key_params = { 436 .hash = filenametr_hash, 437 .cmp = filenametr_cmp, 438 }; 439 440 struct filename_trans_datum *policydb_filenametr_search( 441 struct policydb *p, struct filename_trans_key *key) 442 { 443 return hashtab_search(&p->filename_trans, key, filenametr_key_params); 444 } 445 446 static u32 rangetr_hash(const void *k) 447 { 448 const struct range_trans *key = k; 449 450 return key->source_type + (key->target_type << 3) + 451 (key->target_class << 5); 452 } 453 454 static int rangetr_cmp(const void *k1, const void *k2) 455 { 456 const struct range_trans *key1 = k1, *key2 = k2; 457 int v; 458 459 v = key1->source_type - key2->source_type; 460 if (v) 461 return v; 462 463 v = key1->target_type - key2->target_type; 464 if (v) 465 return v; 466 467 v = key1->target_class - key2->target_class; 468 469 return v; 470 } 471 472 static const struct hashtab_key_params rangetr_key_params = { 473 .hash = rangetr_hash, 474 .cmp = rangetr_cmp, 475 }; 476 477 struct mls_range *policydb_rangetr_search(struct policydb *p, 478 struct range_trans *key) 479 { 480 return hashtab_search(&p->range_tr, key, rangetr_key_params); 481 } 482 483 static u32 role_trans_hash(const void *k) 484 { 485 const struct role_trans_key *key = k; 486 487 return jhash_3words(key->role, key->type, (u32)key->tclass << 16 | key->tclass, 0); 488 } 489 490 static int role_trans_cmp(const void *k1, const void *k2) 491 { 492 const struct role_trans_key *key1 = k1, *key2 = k2; 493 int v; 494 495 v = key1->role - key2->role; 496 if (v) 497 return v; 498 499 v = key1->type - key2->type; 500 if (v) 501 return v; 502 503 return key1->tclass - key2->tclass; 504 } 505 506 static const struct hashtab_key_params roletr_key_params = { 507 .hash = role_trans_hash, 508 .cmp = role_trans_cmp, 509 }; 510 511 struct role_trans_datum *policydb_roletr_search(struct policydb *p, 512 struct role_trans_key *key) 513 { 514 return hashtab_search(&p->role_tr, key, roletr_key_params); 515 } 516 517 /* 518 * Initialize a policy database structure. 519 */ 520 static void policydb_init(struct policydb *p) 521 { 522 memset(p, 0, sizeof(*p)); 523 524 avtab_init(&p->te_avtab); 525 cond_policydb_init(p); 526 527 ebitmap_init(&p->filename_trans_ttypes); 528 ebitmap_init(&p->policycaps); 529 ebitmap_init(&p->permissive_map); 530 } 531 532 /* 533 * The following *_index functions are used to 534 * define the val_to_name and val_to_struct arrays 535 * in a policy database structure. The val_to_name 536 * arrays are used when converting security context 537 * structures into string representations. The 538 * val_to_struct arrays are used when the attributes 539 * of a class, role, or user are needed. 540 */ 541 542 static int common_index(void *key, void *datum, void *datap) 543 { 544 struct policydb *p; 545 struct common_datum *comdatum; 546 547 comdatum = datum; 548 p = datap; 549 if (!comdatum->value || comdatum->value > p->p_commons.nprim) 550 return -EINVAL; 551 552 p->sym_val_to_name[SYM_COMMONS][comdatum->value - 1] = key; 553 554 return 0; 555 } 556 557 static int class_index(void *key, void *datum, void *datap) 558 { 559 struct policydb *p; 560 struct class_datum *cladatum; 561 562 cladatum = datum; 563 p = datap; 564 if (!cladatum->value || cladatum->value > p->p_classes.nprim) 565 return -EINVAL; 566 567 p->sym_val_to_name[SYM_CLASSES][cladatum->value - 1] = key; 568 p->class_val_to_struct[cladatum->value - 1] = cladatum; 569 return 0; 570 } 571 572 static int role_index(void *key, void *datum, void *datap) 573 { 574 struct policydb *p; 575 struct role_datum *role; 576 577 role = datum; 578 p = datap; 579 if (!role->value 580 || role->value > p->p_roles.nprim 581 || role->bounds > p->p_roles.nprim) 582 return -EINVAL; 583 584 p->sym_val_to_name[SYM_ROLES][role->value - 1] = key; 585 p->role_val_to_struct[role->value - 1] = role; 586 return 0; 587 } 588 589 static int type_index(void *key, void *datum, void *datap) 590 { 591 struct policydb *p; 592 struct type_datum *typdatum; 593 594 typdatum = datum; 595 p = datap; 596 597 if (typdatum->primary) { 598 if (!typdatum->value 599 || typdatum->value > p->p_types.nprim 600 || typdatum->bounds > p->p_types.nprim) 601 return -EINVAL; 602 p->sym_val_to_name[SYM_TYPES][typdatum->value - 1] = key; 603 p->type_val_to_struct[typdatum->value - 1] = typdatum; 604 } 605 606 return 0; 607 } 608 609 static int user_index(void *key, void *datum, void *datap) 610 { 611 struct policydb *p; 612 struct user_datum *usrdatum; 613 614 usrdatum = datum; 615 p = datap; 616 if (!usrdatum->value 617 || usrdatum->value > p->p_users.nprim 618 || usrdatum->bounds > p->p_users.nprim) 619 return -EINVAL; 620 621 p->sym_val_to_name[SYM_USERS][usrdatum->value - 1] = key; 622 p->user_val_to_struct[usrdatum->value - 1] = usrdatum; 623 return 0; 624 } 625 626 static int sens_index(void *key, void *datum, void *datap) 627 { 628 struct policydb *p; 629 struct level_datum *levdatum; 630 631 levdatum = datum; 632 p = datap; 633 634 if (!levdatum->isalias) { 635 if (!levdatum->level->sens || 636 levdatum->level->sens > p->p_levels.nprim) 637 return -EINVAL; 638 639 p->sym_val_to_name[SYM_LEVELS][levdatum->level->sens - 1] = key; 640 } 641 642 return 0; 643 } 644 645 static int cat_index(void *key, void *datum, void *datap) 646 { 647 struct policydb *p; 648 struct cat_datum *catdatum; 649 650 catdatum = datum; 651 p = datap; 652 653 if (!catdatum->isalias) { 654 if (!catdatum->value || catdatum->value > p->p_cats.nprim) 655 return -EINVAL; 656 657 p->sym_val_to_name[SYM_CATS][catdatum->value - 1] = key; 658 } 659 660 return 0; 661 } 662 663 static int (*const index_f[SYM_NUM]) (void *key, void *datum, void *datap) = { 664 common_index, 665 class_index, 666 role_index, 667 type_index, 668 user_index, 669 cond_index_bool, 670 sens_index, 671 cat_index, 672 }; 673 674 #ifdef CONFIG_SECURITY_SELINUX_DEBUG 675 static void hash_eval(struct hashtab *h, const char *hash_name) 676 { 677 struct hashtab_info info; 678 679 hashtab_stat(h, &info); 680 pr_debug("SELinux: %s: %d entries and %d/%d buckets used, longest chain length %d, sum of chain length^2 %llu\n", 681 hash_name, h->nel, info.slots_used, h->size, 682 info.max_chain_len, info.chain2_len_sum); 683 } 684 685 static void symtab_hash_eval(struct symtab *s) 686 { 687 int i; 688 689 for (i = 0; i < SYM_NUM; i++) 690 hash_eval(&s[i].table, symtab_name[i]); 691 } 692 693 #else 694 static inline void hash_eval(struct hashtab *h, const char *hash_name) 695 { 696 } 697 static inline void symtab_hash_eval(struct symtab *s) 698 { 699 } 700 #endif /* CONFIG_SECURITY_SELINUX_DEBUG */ 701 702 /* 703 * Define the other val_to_name and val_to_struct arrays 704 * in a policy database structure. 705 * 706 * Caller must clean up on failure. 707 */ 708 static int policydb_index(struct policydb *p) 709 { 710 int i, rc; 711 712 if (p->mls_enabled) 713 pr_debug("SELinux: %d users, %d roles, %d types, %d bools, %d sens, %d cats\n", 714 p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim, 715 p->p_bools.nprim, p->p_levels.nprim, p->p_cats.nprim); 716 else 717 pr_debug("SELinux: %d users, %d roles, %d types, %d bools\n", 718 p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim, 719 p->p_bools.nprim); 720 721 pr_debug("SELinux: %d classes, %d rules\n", 722 p->p_classes.nprim, p->te_avtab.nel); 723 724 avtab_hash_eval(&p->te_avtab, "rules"); 725 symtab_hash_eval(p->symtab); 726 727 p->class_val_to_struct = kcalloc(p->p_classes.nprim, 728 sizeof(*p->class_val_to_struct), 729 GFP_KERNEL); 730 if (!p->class_val_to_struct) 731 return -ENOMEM; 732 733 p->role_val_to_struct = kcalloc(p->p_roles.nprim, 734 sizeof(*p->role_val_to_struct), 735 GFP_KERNEL); 736 if (!p->role_val_to_struct) 737 return -ENOMEM; 738 739 p->user_val_to_struct = kcalloc(p->p_users.nprim, 740 sizeof(*p->user_val_to_struct), 741 GFP_KERNEL); 742 if (!p->user_val_to_struct) 743 return -ENOMEM; 744 745 p->type_val_to_struct = kvcalloc(p->p_types.nprim, 746 sizeof(*p->type_val_to_struct), 747 GFP_KERNEL); 748 if (!p->type_val_to_struct) 749 return -ENOMEM; 750 751 rc = cond_init_bool_indexes(p); 752 if (rc) 753 goto out; 754 755 for (i = 0; i < SYM_NUM; i++) { 756 p->sym_val_to_name[i] = kvcalloc(p->symtab[i].nprim, 757 sizeof(char *), 758 GFP_KERNEL); 759 if (!p->sym_val_to_name[i]) 760 return -ENOMEM; 761 762 rc = hashtab_map(&p->symtab[i].table, index_f[i], p); 763 if (rc) 764 goto out; 765 } 766 rc = 0; 767 out: 768 return rc; 769 } 770 771 /* 772 * Free any memory allocated by a policy database structure. 773 */ 774 void policydb_destroy(struct policydb *p) 775 { 776 struct ocontext *c, *ctmp; 777 struct genfs *g, *gtmp; 778 u32 i; 779 struct role_allow *ra, *lra = NULL; 780 781 for (i = 0; i < SYM_NUM; i++) { 782 cond_resched(); 783 hashtab_map(&p->symtab[i].table, destroy_f[i], NULL); 784 hashtab_destroy(&p->symtab[i].table); 785 } 786 787 for (i = 0; i < SYM_NUM; i++) 788 kvfree(p->sym_val_to_name[i]); 789 790 kfree(p->class_val_to_struct); 791 kfree(p->role_val_to_struct); 792 kfree(p->user_val_to_struct); 793 kvfree(p->type_val_to_struct); 794 795 avtab_destroy(&p->te_avtab); 796 797 for (i = 0; i < OCON_NUM; i++) { 798 cond_resched(); 799 c = p->ocontexts[i]; 800 while (c) { 801 ctmp = c; 802 c = c->next; 803 ocontext_destroy(ctmp, i); 804 } 805 p->ocontexts[i] = NULL; 806 } 807 808 g = p->genfs; 809 while (g) { 810 cond_resched(); 811 kfree(g->fstype); 812 c = g->head; 813 while (c) { 814 ctmp = c; 815 c = c->next; 816 ocontext_destroy(ctmp, OCON_FSUSE); 817 } 818 gtmp = g; 819 g = g->next; 820 kfree(gtmp); 821 } 822 p->genfs = NULL; 823 824 cond_policydb_destroy(p); 825 826 hashtab_map(&p->role_tr, role_tr_destroy, NULL); 827 hashtab_destroy(&p->role_tr); 828 829 for (ra = p->role_allow; ra; ra = ra->next) { 830 cond_resched(); 831 kfree(lra); 832 lra = ra; 833 } 834 kfree(lra); 835 836 hashtab_map(&p->filename_trans, filenametr_destroy, NULL); 837 hashtab_destroy(&p->filename_trans); 838 839 hashtab_map(&p->range_tr, range_tr_destroy, NULL); 840 hashtab_destroy(&p->range_tr); 841 842 if (p->type_attr_map_array) { 843 for (i = 0; i < p->p_types.nprim; i++) 844 ebitmap_destroy(&p->type_attr_map_array[i]); 845 kvfree(p->type_attr_map_array); 846 } 847 848 ebitmap_destroy(&p->filename_trans_ttypes); 849 ebitmap_destroy(&p->policycaps); 850 ebitmap_destroy(&p->permissive_map); 851 } 852 853 /* 854 * Load the initial SIDs specified in a policy database 855 * structure into a SID table. 856 */ 857 int policydb_load_isids(struct policydb *p, struct sidtab *s) 858 { 859 struct ocontext *head, *c; 860 bool isid_init_supported = ebitmap_get_bit(&p->policycaps, 861 POLICYDB_CAP_USERSPACE_INITIAL_CONTEXT); 862 int rc; 863 864 rc = sidtab_init(s); 865 if (rc) { 866 pr_err("SELinux: out of memory on SID table init\n"); 867 return rc; 868 } 869 870 head = p->ocontexts[OCON_ISID]; 871 for (c = head; c; c = c->next) { 872 u32 sid = c->sid[0]; 873 const char *name = security_get_initial_sid_context(sid); 874 875 if (sid == SECSID_NULL) { 876 pr_err("SELinux: SID 0 was assigned a context.\n"); 877 sidtab_destroy(s); 878 return -EINVAL; 879 } 880 881 /* Ignore initial SIDs unused by this kernel. */ 882 if (!name) 883 continue; 884 885 /* 886 * Also ignore SECINITSID_INIT if the policy doesn't declare 887 * support for it 888 */ 889 if (sid == SECINITSID_INIT && !isid_init_supported) 890 continue; 891 892 rc = sidtab_set_initial(s, sid, &c->context[0]); 893 if (rc) { 894 pr_err("SELinux: unable to load initial SID %s.\n", 895 name); 896 sidtab_destroy(s); 897 return rc; 898 } 899 900 /* 901 * If the policy doesn't support the "userspace_initial_context" 902 * capability, set SECINITSID_INIT to the same context as 903 * SECINITSID_KERNEL. This ensures the same behavior as before 904 * the reintroduction of SECINITSID_INIT, where all tasks 905 * started before policy load would initially get the context 906 * corresponding to SECINITSID_KERNEL. 907 */ 908 if (sid == SECINITSID_KERNEL && !isid_init_supported) { 909 rc = sidtab_set_initial(s, SECINITSID_INIT, &c->context[0]); 910 if (rc) { 911 pr_err("SELinux: unable to load initial SID %s.\n", 912 name); 913 sidtab_destroy(s); 914 return rc; 915 } 916 } 917 } 918 return 0; 919 } 920 921 int policydb_class_isvalid(struct policydb *p, unsigned int class) 922 { 923 if (!class || class > p->p_classes.nprim) 924 return 0; 925 return 1; 926 } 927 928 int policydb_role_isvalid(struct policydb *p, unsigned int role) 929 { 930 if (!role || role > p->p_roles.nprim) 931 return 0; 932 return 1; 933 } 934 935 int policydb_type_isvalid(struct policydb *p, unsigned int type) 936 { 937 if (!type || type > p->p_types.nprim) 938 return 0; 939 return 1; 940 } 941 942 /* 943 * Return 1 if the fields in the security context 944 * structure `c' are valid. Return 0 otherwise. 945 */ 946 int policydb_context_isvalid(struct policydb *p, struct context *c) 947 { 948 struct role_datum *role; 949 struct user_datum *usrdatum; 950 951 if (!c->role || c->role > p->p_roles.nprim) 952 return 0; 953 954 if (!c->user || c->user > p->p_users.nprim) 955 return 0; 956 957 if (!c->type || c->type > p->p_types.nprim) 958 return 0; 959 960 if (c->role != OBJECT_R_VAL) { 961 /* 962 * Role must be authorized for the type. 963 */ 964 role = p->role_val_to_struct[c->role - 1]; 965 if (!role || !ebitmap_get_bit(&role->types, c->type - 1)) 966 /* role may not be associated with type */ 967 return 0; 968 969 /* 970 * User must be authorized for the role. 971 */ 972 usrdatum = p->user_val_to_struct[c->user - 1]; 973 if (!usrdatum) 974 return 0; 975 976 if (!ebitmap_get_bit(&usrdatum->roles, c->role - 1)) 977 /* user may not be associated with role */ 978 return 0; 979 } 980 981 if (!mls_context_isvalid(p, c)) 982 return 0; 983 984 return 1; 985 } 986 987 /* 988 * Read a MLS range structure from a policydb binary 989 * representation file. 990 */ 991 static int mls_read_range_helper(struct mls_range *r, void *fp) 992 { 993 __le32 buf[2]; 994 u32 items; 995 int rc; 996 997 rc = next_entry(buf, fp, sizeof(u32)); 998 if (rc) 999 goto out; 1000 1001 rc = -EINVAL; 1002 items = le32_to_cpu(buf[0]); 1003 if (items > ARRAY_SIZE(buf)) { 1004 pr_err("SELinux: mls: range overflow\n"); 1005 goto out; 1006 } 1007 1008 rc = next_entry(buf, fp, sizeof(u32) * items); 1009 if (rc) { 1010 pr_err("SELinux: mls: truncated range\n"); 1011 goto out; 1012 } 1013 1014 r->level[0].sens = le32_to_cpu(buf[0]); 1015 if (items > 1) 1016 r->level[1].sens = le32_to_cpu(buf[1]); 1017 else 1018 r->level[1].sens = r->level[0].sens; 1019 1020 rc = ebitmap_read(&r->level[0].cat, fp); 1021 if (rc) { 1022 pr_err("SELinux: mls: error reading low categories\n"); 1023 goto out; 1024 } 1025 if (items > 1) { 1026 rc = ebitmap_read(&r->level[1].cat, fp); 1027 if (rc) { 1028 pr_err("SELinux: mls: error reading high categories\n"); 1029 goto bad_high; 1030 } 1031 } else { 1032 rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat); 1033 if (rc) { 1034 pr_err("SELinux: mls: out of memory\n"); 1035 goto bad_high; 1036 } 1037 } 1038 1039 return 0; 1040 bad_high: 1041 ebitmap_destroy(&r->level[0].cat); 1042 out: 1043 return rc; 1044 } 1045 1046 /* 1047 * Read and validate a security context structure 1048 * from a policydb binary representation file. 1049 */ 1050 static int context_read_and_validate(struct context *c, 1051 struct policydb *p, 1052 void *fp) 1053 { 1054 __le32 buf[3]; 1055 int rc; 1056 1057 rc = next_entry(buf, fp, sizeof buf); 1058 if (rc) { 1059 pr_err("SELinux: context truncated\n"); 1060 goto out; 1061 } 1062 c->user = le32_to_cpu(buf[0]); 1063 c->role = le32_to_cpu(buf[1]); 1064 c->type = le32_to_cpu(buf[2]); 1065 if (p->policyvers >= POLICYDB_VERSION_MLS) { 1066 rc = mls_read_range_helper(&c->range, fp); 1067 if (rc) { 1068 pr_err("SELinux: error reading MLS range of context\n"); 1069 goto out; 1070 } 1071 } 1072 1073 rc = -EINVAL; 1074 if (!policydb_context_isvalid(p, c)) { 1075 pr_err("SELinux: invalid security context\n"); 1076 context_destroy(c); 1077 goto out; 1078 } 1079 rc = 0; 1080 out: 1081 return rc; 1082 } 1083 1084 /* 1085 * The following *_read functions are used to 1086 * read the symbol data from a policy database 1087 * binary representation file. 1088 */ 1089 1090 static int str_read(char **strp, gfp_t flags, void *fp, u32 len) 1091 { 1092 int rc; 1093 char *str; 1094 1095 if ((len == 0) || (len == (u32)-1)) 1096 return -EINVAL; 1097 1098 str = kmalloc(len + 1, flags | __GFP_NOWARN); 1099 if (!str) 1100 return -ENOMEM; 1101 1102 rc = next_entry(str, fp, len); 1103 if (rc) { 1104 kfree(str); 1105 return rc; 1106 } 1107 1108 str[len] = '\0'; 1109 *strp = str; 1110 return 0; 1111 } 1112 1113 static int perm_read(struct policydb *p, struct symtab *s, void *fp) 1114 { 1115 char *key = NULL; 1116 struct perm_datum *perdatum; 1117 int rc; 1118 __le32 buf[2]; 1119 u32 len; 1120 1121 perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL); 1122 if (!perdatum) 1123 return -ENOMEM; 1124 1125 rc = next_entry(buf, fp, sizeof buf); 1126 if (rc) 1127 goto bad; 1128 1129 len = le32_to_cpu(buf[0]); 1130 perdatum->value = le32_to_cpu(buf[1]); 1131 1132 rc = str_read(&key, GFP_KERNEL, fp, len); 1133 if (rc) 1134 goto bad; 1135 1136 rc = symtab_insert(s, key, perdatum); 1137 if (rc) 1138 goto bad; 1139 1140 return 0; 1141 bad: 1142 perm_destroy(key, perdatum, NULL); 1143 return rc; 1144 } 1145 1146 static int common_read(struct policydb *p, struct symtab *s, void *fp) 1147 { 1148 char *key = NULL; 1149 struct common_datum *comdatum; 1150 __le32 buf[4]; 1151 u32 i, len, nel; 1152 int rc; 1153 1154 comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL); 1155 if (!comdatum) 1156 return -ENOMEM; 1157 1158 rc = next_entry(buf, fp, sizeof buf); 1159 if (rc) 1160 goto bad; 1161 1162 len = le32_to_cpu(buf[0]); 1163 comdatum->value = le32_to_cpu(buf[1]); 1164 nel = le32_to_cpu(buf[3]); 1165 1166 rc = symtab_init(&comdatum->permissions, nel); 1167 if (rc) 1168 goto bad; 1169 comdatum->permissions.nprim = le32_to_cpu(buf[2]); 1170 1171 rc = str_read(&key, GFP_KERNEL, fp, len); 1172 if (rc) 1173 goto bad; 1174 1175 for (i = 0; i < nel; i++) { 1176 rc = perm_read(p, &comdatum->permissions, fp); 1177 if (rc) 1178 goto bad; 1179 } 1180 1181 rc = symtab_insert(s, key, comdatum); 1182 if (rc) 1183 goto bad; 1184 return 0; 1185 bad: 1186 common_destroy(key, comdatum, NULL); 1187 return rc; 1188 } 1189 1190 static void type_set_init(struct type_set *t) 1191 { 1192 ebitmap_init(&t->types); 1193 ebitmap_init(&t->negset); 1194 } 1195 1196 static int type_set_read(struct type_set *t, void *fp) 1197 { 1198 __le32 buf[1]; 1199 int rc; 1200 1201 if (ebitmap_read(&t->types, fp)) 1202 return -EINVAL; 1203 if (ebitmap_read(&t->negset, fp)) 1204 return -EINVAL; 1205 1206 rc = next_entry(buf, fp, sizeof(u32)); 1207 if (rc < 0) 1208 return -EINVAL; 1209 t->flags = le32_to_cpu(buf[0]); 1210 1211 return 0; 1212 } 1213 1214 1215 static int read_cons_helper(struct policydb *p, 1216 struct constraint_node **nodep, 1217 u32 ncons, int allowxtarget, void *fp) 1218 { 1219 struct constraint_node *c, *lc; 1220 struct constraint_expr *e, *le; 1221 __le32 buf[3]; 1222 u32 i, j, nexpr; 1223 int rc, depth; 1224 1225 lc = NULL; 1226 for (i = 0; i < ncons; i++) { 1227 c = kzalloc(sizeof(*c), GFP_KERNEL); 1228 if (!c) 1229 return -ENOMEM; 1230 1231 if (lc) 1232 lc->next = c; 1233 else 1234 *nodep = c; 1235 1236 rc = next_entry(buf, fp, (sizeof(u32) * 2)); 1237 if (rc) 1238 return rc; 1239 c->permissions = le32_to_cpu(buf[0]); 1240 nexpr = le32_to_cpu(buf[1]); 1241 le = NULL; 1242 depth = -1; 1243 for (j = 0; j < nexpr; j++) { 1244 e = kzalloc(sizeof(*e), GFP_KERNEL); 1245 if (!e) 1246 return -ENOMEM; 1247 1248 if (le) 1249 le->next = e; 1250 else 1251 c->expr = e; 1252 1253 rc = next_entry(buf, fp, (sizeof(u32) * 3)); 1254 if (rc) 1255 return rc; 1256 e->expr_type = le32_to_cpu(buf[0]); 1257 e->attr = le32_to_cpu(buf[1]); 1258 e->op = le32_to_cpu(buf[2]); 1259 1260 switch (e->expr_type) { 1261 case CEXPR_NOT: 1262 if (depth < 0) 1263 return -EINVAL; 1264 break; 1265 case CEXPR_AND: 1266 case CEXPR_OR: 1267 if (depth < 1) 1268 return -EINVAL; 1269 depth--; 1270 break; 1271 case CEXPR_ATTR: 1272 if (depth == (CEXPR_MAXDEPTH - 1)) 1273 return -EINVAL; 1274 depth++; 1275 break; 1276 case CEXPR_NAMES: 1277 if (!allowxtarget && (e->attr & CEXPR_XTARGET)) 1278 return -EINVAL; 1279 if (depth == (CEXPR_MAXDEPTH - 1)) 1280 return -EINVAL; 1281 depth++; 1282 rc = ebitmap_read(&e->names, fp); 1283 if (rc) 1284 return rc; 1285 if (p->policyvers >= 1286 POLICYDB_VERSION_CONSTRAINT_NAMES) { 1287 e->type_names = kzalloc(sizeof 1288 (*e->type_names), GFP_KERNEL); 1289 if (!e->type_names) 1290 return -ENOMEM; 1291 type_set_init(e->type_names); 1292 rc = type_set_read(e->type_names, fp); 1293 if (rc) 1294 return rc; 1295 } 1296 break; 1297 default: 1298 return -EINVAL; 1299 } 1300 le = e; 1301 } 1302 if (depth != 0) 1303 return -EINVAL; 1304 lc = c; 1305 } 1306 1307 return 0; 1308 } 1309 1310 static int class_read(struct policydb *p, struct symtab *s, void *fp) 1311 { 1312 char *key = NULL; 1313 struct class_datum *cladatum; 1314 __le32 buf[6]; 1315 u32 i, len, len2, ncons, nel; 1316 int rc; 1317 1318 cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL); 1319 if (!cladatum) 1320 return -ENOMEM; 1321 1322 rc = next_entry(buf, fp, sizeof(u32)*6); 1323 if (rc) 1324 goto bad; 1325 1326 len = le32_to_cpu(buf[0]); 1327 len2 = le32_to_cpu(buf[1]); 1328 cladatum->value = le32_to_cpu(buf[2]); 1329 nel = le32_to_cpu(buf[4]); 1330 1331 rc = symtab_init(&cladatum->permissions, nel); 1332 if (rc) 1333 goto bad; 1334 cladatum->permissions.nprim = le32_to_cpu(buf[3]); 1335 1336 ncons = le32_to_cpu(buf[5]); 1337 1338 rc = str_read(&key, GFP_KERNEL, fp, len); 1339 if (rc) 1340 goto bad; 1341 1342 if (len2) { 1343 rc = str_read(&cladatum->comkey, GFP_KERNEL, fp, len2); 1344 if (rc) 1345 goto bad; 1346 1347 rc = -EINVAL; 1348 cladatum->comdatum = symtab_search(&p->p_commons, 1349 cladatum->comkey); 1350 if (!cladatum->comdatum) { 1351 pr_err("SELinux: unknown common %s\n", 1352 cladatum->comkey); 1353 goto bad; 1354 } 1355 } 1356 for (i = 0; i < nel; i++) { 1357 rc = perm_read(p, &cladatum->permissions, fp); 1358 if (rc) 1359 goto bad; 1360 } 1361 1362 rc = read_cons_helper(p, &cladatum->constraints, ncons, 0, fp); 1363 if (rc) 1364 goto bad; 1365 1366 if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) { 1367 /* grab the validatetrans rules */ 1368 rc = next_entry(buf, fp, sizeof(u32)); 1369 if (rc) 1370 goto bad; 1371 ncons = le32_to_cpu(buf[0]); 1372 rc = read_cons_helper(p, &cladatum->validatetrans, 1373 ncons, 1, fp); 1374 if (rc) 1375 goto bad; 1376 } 1377 1378 if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) { 1379 rc = next_entry(buf, fp, sizeof(u32) * 3); 1380 if (rc) 1381 goto bad; 1382 1383 cladatum->default_user = le32_to_cpu(buf[0]); 1384 cladatum->default_role = le32_to_cpu(buf[1]); 1385 cladatum->default_range = le32_to_cpu(buf[2]); 1386 } 1387 1388 if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) { 1389 rc = next_entry(buf, fp, sizeof(u32) * 1); 1390 if (rc) 1391 goto bad; 1392 cladatum->default_type = le32_to_cpu(buf[0]); 1393 } 1394 1395 rc = symtab_insert(s, key, cladatum); 1396 if (rc) 1397 goto bad; 1398 1399 return 0; 1400 bad: 1401 cls_destroy(key, cladatum, NULL); 1402 return rc; 1403 } 1404 1405 static int role_read(struct policydb *p, struct symtab *s, void *fp) 1406 { 1407 char *key = NULL; 1408 struct role_datum *role; 1409 int rc; 1410 unsigned int to_read = 2; 1411 __le32 buf[3]; 1412 u32 len; 1413 1414 role = kzalloc(sizeof(*role), GFP_KERNEL); 1415 if (!role) 1416 return -ENOMEM; 1417 1418 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) 1419 to_read = 3; 1420 1421 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read); 1422 if (rc) 1423 goto bad; 1424 1425 len = le32_to_cpu(buf[0]); 1426 role->value = le32_to_cpu(buf[1]); 1427 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) 1428 role->bounds = le32_to_cpu(buf[2]); 1429 1430 rc = str_read(&key, GFP_KERNEL, fp, len); 1431 if (rc) 1432 goto bad; 1433 1434 rc = ebitmap_read(&role->dominates, fp); 1435 if (rc) 1436 goto bad; 1437 1438 rc = ebitmap_read(&role->types, fp); 1439 if (rc) 1440 goto bad; 1441 1442 if (strcmp(key, OBJECT_R) == 0) { 1443 rc = -EINVAL; 1444 if (role->value != OBJECT_R_VAL) { 1445 pr_err("SELinux: Role %s has wrong value %d\n", 1446 OBJECT_R, role->value); 1447 goto bad; 1448 } 1449 rc = 0; 1450 goto bad; 1451 } 1452 1453 rc = symtab_insert(s, key, role); 1454 if (rc) 1455 goto bad; 1456 return 0; 1457 bad: 1458 role_destroy(key, role, NULL); 1459 return rc; 1460 } 1461 1462 static int type_read(struct policydb *p, struct symtab *s, void *fp) 1463 { 1464 char *key = NULL; 1465 struct type_datum *typdatum; 1466 int rc; 1467 unsigned int to_read = 3; 1468 __le32 buf[4]; 1469 u32 len; 1470 1471 typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL); 1472 if (!typdatum) 1473 return -ENOMEM; 1474 1475 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) 1476 to_read = 4; 1477 1478 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read); 1479 if (rc) 1480 goto bad; 1481 1482 len = le32_to_cpu(buf[0]); 1483 typdatum->value = le32_to_cpu(buf[1]); 1484 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) { 1485 u32 prop = le32_to_cpu(buf[2]); 1486 1487 if (prop & TYPEDATUM_PROPERTY_PRIMARY) 1488 typdatum->primary = 1; 1489 if (prop & TYPEDATUM_PROPERTY_ATTRIBUTE) 1490 typdatum->attribute = 1; 1491 1492 typdatum->bounds = le32_to_cpu(buf[3]); 1493 } else { 1494 typdatum->primary = le32_to_cpu(buf[2]); 1495 } 1496 1497 rc = str_read(&key, GFP_KERNEL, fp, len); 1498 if (rc) 1499 goto bad; 1500 1501 rc = symtab_insert(s, key, typdatum); 1502 if (rc) 1503 goto bad; 1504 return 0; 1505 bad: 1506 type_destroy(key, typdatum, NULL); 1507 return rc; 1508 } 1509 1510 1511 /* 1512 * Read a MLS level structure from a policydb binary 1513 * representation file. 1514 */ 1515 static int mls_read_level(struct mls_level *lp, void *fp) 1516 { 1517 __le32 buf[1]; 1518 int rc; 1519 1520 memset(lp, 0, sizeof(*lp)); 1521 1522 rc = next_entry(buf, fp, sizeof buf); 1523 if (rc) { 1524 pr_err("SELinux: mls: truncated level\n"); 1525 return rc; 1526 } 1527 lp->sens = le32_to_cpu(buf[0]); 1528 1529 rc = ebitmap_read(&lp->cat, fp); 1530 if (rc) { 1531 pr_err("SELinux: mls: error reading level categories\n"); 1532 return rc; 1533 } 1534 return 0; 1535 } 1536 1537 static int user_read(struct policydb *p, struct symtab *s, void *fp) 1538 { 1539 char *key = NULL; 1540 struct user_datum *usrdatum; 1541 int rc; 1542 unsigned int to_read = 2; 1543 __le32 buf[3]; 1544 u32 len; 1545 1546 usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL); 1547 if (!usrdatum) 1548 return -ENOMEM; 1549 1550 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) 1551 to_read = 3; 1552 1553 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read); 1554 if (rc) 1555 goto bad; 1556 1557 len = le32_to_cpu(buf[0]); 1558 usrdatum->value = le32_to_cpu(buf[1]); 1559 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) 1560 usrdatum->bounds = le32_to_cpu(buf[2]); 1561 1562 rc = str_read(&key, GFP_KERNEL, fp, len); 1563 if (rc) 1564 goto bad; 1565 1566 rc = ebitmap_read(&usrdatum->roles, fp); 1567 if (rc) 1568 goto bad; 1569 1570 if (p->policyvers >= POLICYDB_VERSION_MLS) { 1571 rc = mls_read_range_helper(&usrdatum->range, fp); 1572 if (rc) 1573 goto bad; 1574 rc = mls_read_level(&usrdatum->dfltlevel, fp); 1575 if (rc) 1576 goto bad; 1577 } 1578 1579 rc = symtab_insert(s, key, usrdatum); 1580 if (rc) 1581 goto bad; 1582 return 0; 1583 bad: 1584 user_destroy(key, usrdatum, NULL); 1585 return rc; 1586 } 1587 1588 static int sens_read(struct policydb *p, struct symtab *s, void *fp) 1589 { 1590 char *key = NULL; 1591 struct level_datum *levdatum; 1592 int rc; 1593 __le32 buf[2]; 1594 u32 len; 1595 1596 levdatum = kzalloc(sizeof(*levdatum), GFP_KERNEL); 1597 if (!levdatum) 1598 return -ENOMEM; 1599 1600 rc = next_entry(buf, fp, sizeof buf); 1601 if (rc) 1602 goto bad; 1603 1604 len = le32_to_cpu(buf[0]); 1605 levdatum->isalias = le32_to_cpu(buf[1]); 1606 1607 rc = str_read(&key, GFP_KERNEL, fp, len); 1608 if (rc) 1609 goto bad; 1610 1611 rc = -ENOMEM; 1612 levdatum->level = kmalloc(sizeof(*levdatum->level), GFP_KERNEL); 1613 if (!levdatum->level) 1614 goto bad; 1615 1616 rc = mls_read_level(levdatum->level, fp); 1617 if (rc) 1618 goto bad; 1619 1620 rc = symtab_insert(s, key, levdatum); 1621 if (rc) 1622 goto bad; 1623 return 0; 1624 bad: 1625 sens_destroy(key, levdatum, NULL); 1626 return rc; 1627 } 1628 1629 static int cat_read(struct policydb *p, struct symtab *s, void *fp) 1630 { 1631 char *key = NULL; 1632 struct cat_datum *catdatum; 1633 int rc; 1634 __le32 buf[3]; 1635 u32 len; 1636 1637 catdatum = kzalloc(sizeof(*catdatum), GFP_KERNEL); 1638 if (!catdatum) 1639 return -ENOMEM; 1640 1641 rc = next_entry(buf, fp, sizeof buf); 1642 if (rc) 1643 goto bad; 1644 1645 len = le32_to_cpu(buf[0]); 1646 catdatum->value = le32_to_cpu(buf[1]); 1647 catdatum->isalias = le32_to_cpu(buf[2]); 1648 1649 rc = str_read(&key, GFP_KERNEL, fp, len); 1650 if (rc) 1651 goto bad; 1652 1653 rc = symtab_insert(s, key, catdatum); 1654 if (rc) 1655 goto bad; 1656 return 0; 1657 bad: 1658 cat_destroy(key, catdatum, NULL); 1659 return rc; 1660 } 1661 1662 static int (*const read_f[SYM_NUM]) (struct policydb *p, 1663 struct symtab *s, void *fp) = { 1664 common_read, 1665 class_read, 1666 role_read, 1667 type_read, 1668 user_read, 1669 cond_read_bool, 1670 sens_read, 1671 cat_read, 1672 }; 1673 1674 static int user_bounds_sanity_check(void *key, void *datum, void *datap) 1675 { 1676 struct user_datum *upper, *user; 1677 struct policydb *p = datap; 1678 int depth = 0; 1679 1680 upper = user = datum; 1681 while (upper->bounds) { 1682 struct ebitmap_node *node; 1683 u32 bit; 1684 1685 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) { 1686 pr_err("SELinux: user %s: " 1687 "too deep or looped boundary\n", 1688 (char *) key); 1689 return -EINVAL; 1690 } 1691 1692 upper = p->user_val_to_struct[upper->bounds - 1]; 1693 ebitmap_for_each_positive_bit(&user->roles, node, bit) { 1694 if (ebitmap_get_bit(&upper->roles, bit)) 1695 continue; 1696 1697 pr_err("SELinux: boundary violated policy: " 1698 "user=%s role=%s bounds=%s\n", 1699 sym_name(p, SYM_USERS, user->value - 1), 1700 sym_name(p, SYM_ROLES, bit), 1701 sym_name(p, SYM_USERS, upper->value - 1)); 1702 1703 return -EINVAL; 1704 } 1705 } 1706 1707 return 0; 1708 } 1709 1710 static int role_bounds_sanity_check(void *key, void *datum, void *datap) 1711 { 1712 struct role_datum *upper, *role; 1713 struct policydb *p = datap; 1714 int depth = 0; 1715 1716 upper = role = datum; 1717 while (upper->bounds) { 1718 struct ebitmap_node *node; 1719 u32 bit; 1720 1721 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) { 1722 pr_err("SELinux: role %s: " 1723 "too deep or looped bounds\n", 1724 (char *) key); 1725 return -EINVAL; 1726 } 1727 1728 upper = p->role_val_to_struct[upper->bounds - 1]; 1729 ebitmap_for_each_positive_bit(&role->types, node, bit) { 1730 if (ebitmap_get_bit(&upper->types, bit)) 1731 continue; 1732 1733 pr_err("SELinux: boundary violated policy: " 1734 "role=%s type=%s bounds=%s\n", 1735 sym_name(p, SYM_ROLES, role->value - 1), 1736 sym_name(p, SYM_TYPES, bit), 1737 sym_name(p, SYM_ROLES, upper->value - 1)); 1738 1739 return -EINVAL; 1740 } 1741 } 1742 1743 return 0; 1744 } 1745 1746 static int type_bounds_sanity_check(void *key, void *datum, void *datap) 1747 { 1748 struct type_datum *upper; 1749 struct policydb *p = datap; 1750 int depth = 0; 1751 1752 upper = datum; 1753 while (upper->bounds) { 1754 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) { 1755 pr_err("SELinux: type %s: " 1756 "too deep or looped boundary\n", 1757 (char *) key); 1758 return -EINVAL; 1759 } 1760 1761 upper = p->type_val_to_struct[upper->bounds - 1]; 1762 BUG_ON(!upper); 1763 1764 if (upper->attribute) { 1765 pr_err("SELinux: type %s: " 1766 "bounded by attribute %s\n", 1767 (char *) key, 1768 sym_name(p, SYM_TYPES, upper->value - 1)); 1769 return -EINVAL; 1770 } 1771 } 1772 1773 return 0; 1774 } 1775 1776 static int policydb_bounds_sanity_check(struct policydb *p) 1777 { 1778 int rc; 1779 1780 if (p->policyvers < POLICYDB_VERSION_BOUNDARY) 1781 return 0; 1782 1783 rc = hashtab_map(&p->p_users.table, user_bounds_sanity_check, p); 1784 if (rc) 1785 return rc; 1786 1787 rc = hashtab_map(&p->p_roles.table, role_bounds_sanity_check, p); 1788 if (rc) 1789 return rc; 1790 1791 rc = hashtab_map(&p->p_types.table, type_bounds_sanity_check, p); 1792 if (rc) 1793 return rc; 1794 1795 return 0; 1796 } 1797 1798 u16 string_to_security_class(struct policydb *p, const char *name) 1799 { 1800 struct class_datum *cladatum; 1801 1802 cladatum = symtab_search(&p->p_classes, name); 1803 if (!cladatum) 1804 return 0; 1805 1806 return cladatum->value; 1807 } 1808 1809 u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name) 1810 { 1811 struct class_datum *cladatum; 1812 struct perm_datum *perdatum = NULL; 1813 struct common_datum *comdatum; 1814 1815 if (!tclass || tclass > p->p_classes.nprim) 1816 return 0; 1817 1818 cladatum = p->class_val_to_struct[tclass-1]; 1819 comdatum = cladatum->comdatum; 1820 if (comdatum) 1821 perdatum = symtab_search(&comdatum->permissions, name); 1822 if (!perdatum) 1823 perdatum = symtab_search(&cladatum->permissions, name); 1824 if (!perdatum) 1825 return 0; 1826 1827 return 1U << (perdatum->value-1); 1828 } 1829 1830 static int range_read(struct policydb *p, void *fp) 1831 { 1832 struct range_trans *rt = NULL; 1833 struct mls_range *r = NULL; 1834 int rc; 1835 __le32 buf[2]; 1836 u32 i, nel; 1837 1838 if (p->policyvers < POLICYDB_VERSION_MLS) 1839 return 0; 1840 1841 rc = next_entry(buf, fp, sizeof(u32)); 1842 if (rc) 1843 return rc; 1844 1845 nel = le32_to_cpu(buf[0]); 1846 1847 rc = hashtab_init(&p->range_tr, nel); 1848 if (rc) 1849 return rc; 1850 1851 for (i = 0; i < nel; i++) { 1852 rc = -ENOMEM; 1853 rt = kzalloc(sizeof(*rt), GFP_KERNEL); 1854 if (!rt) 1855 goto out; 1856 1857 rc = next_entry(buf, fp, (sizeof(u32) * 2)); 1858 if (rc) 1859 goto out; 1860 1861 rt->source_type = le32_to_cpu(buf[0]); 1862 rt->target_type = le32_to_cpu(buf[1]); 1863 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) { 1864 rc = next_entry(buf, fp, sizeof(u32)); 1865 if (rc) 1866 goto out; 1867 rt->target_class = le32_to_cpu(buf[0]); 1868 } else 1869 rt->target_class = p->process_class; 1870 1871 rc = -EINVAL; 1872 if (!policydb_type_isvalid(p, rt->source_type) || 1873 !policydb_type_isvalid(p, rt->target_type) || 1874 !policydb_class_isvalid(p, rt->target_class)) 1875 goto out; 1876 1877 rc = -ENOMEM; 1878 r = kzalloc(sizeof(*r), GFP_KERNEL); 1879 if (!r) 1880 goto out; 1881 1882 rc = mls_read_range_helper(r, fp); 1883 if (rc) 1884 goto out; 1885 1886 rc = -EINVAL; 1887 if (!mls_range_isvalid(p, r)) { 1888 pr_warn("SELinux: rangetrans: invalid range\n"); 1889 goto out; 1890 } 1891 1892 rc = hashtab_insert(&p->range_tr, rt, r, rangetr_key_params); 1893 if (rc) 1894 goto out; 1895 1896 rt = NULL; 1897 r = NULL; 1898 } 1899 hash_eval(&p->range_tr, "rangetr"); 1900 rc = 0; 1901 out: 1902 kfree(rt); 1903 kfree(r); 1904 return rc; 1905 } 1906 1907 static int filename_trans_read_helper_compat(struct policydb *p, void *fp) 1908 { 1909 struct filename_trans_key key, *ft = NULL; 1910 struct filename_trans_datum *last, *datum = NULL; 1911 char *name = NULL; 1912 u32 len, stype, otype; 1913 __le32 buf[4]; 1914 int rc; 1915 1916 /* length of the path component string */ 1917 rc = next_entry(buf, fp, sizeof(u32)); 1918 if (rc) 1919 return rc; 1920 len = le32_to_cpu(buf[0]); 1921 1922 /* path component string */ 1923 rc = str_read(&name, GFP_KERNEL, fp, len); 1924 if (rc) 1925 return rc; 1926 1927 rc = next_entry(buf, fp, sizeof(u32) * 4); 1928 if (rc) 1929 goto out; 1930 1931 stype = le32_to_cpu(buf[0]); 1932 key.ttype = le32_to_cpu(buf[1]); 1933 key.tclass = le32_to_cpu(buf[2]); 1934 key.name = name; 1935 1936 otype = le32_to_cpu(buf[3]); 1937 1938 last = NULL; 1939 datum = policydb_filenametr_search(p, &key); 1940 while (datum) { 1941 if (unlikely(ebitmap_get_bit(&datum->stypes, stype - 1))) { 1942 /* conflicting/duplicate rules are ignored */ 1943 datum = NULL; 1944 goto out; 1945 } 1946 if (likely(datum->otype == otype)) 1947 break; 1948 last = datum; 1949 datum = datum->next; 1950 } 1951 if (!datum) { 1952 rc = -ENOMEM; 1953 datum = kmalloc(sizeof(*datum), GFP_KERNEL); 1954 if (!datum) 1955 goto out; 1956 1957 ebitmap_init(&datum->stypes); 1958 datum->otype = otype; 1959 datum->next = NULL; 1960 1961 if (unlikely(last)) { 1962 last->next = datum; 1963 } else { 1964 rc = -ENOMEM; 1965 ft = kmemdup(&key, sizeof(key), GFP_KERNEL); 1966 if (!ft) 1967 goto out; 1968 1969 rc = hashtab_insert(&p->filename_trans, ft, datum, 1970 filenametr_key_params); 1971 if (rc) 1972 goto out; 1973 name = NULL; 1974 1975 rc = ebitmap_set_bit(&p->filename_trans_ttypes, 1976 key.ttype, 1); 1977 if (rc) 1978 return rc; 1979 } 1980 } 1981 kfree(name); 1982 return ebitmap_set_bit(&datum->stypes, stype - 1, 1); 1983 1984 out: 1985 kfree(ft); 1986 kfree(name); 1987 kfree(datum); 1988 return rc; 1989 } 1990 1991 static int filename_trans_read_helper(struct policydb *p, void *fp) 1992 { 1993 struct filename_trans_key *ft = NULL; 1994 struct filename_trans_datum **dst, *datum, *first = NULL; 1995 char *name = NULL; 1996 u32 len, ttype, tclass, ndatum, i; 1997 __le32 buf[3]; 1998 int rc; 1999 2000 /* length of the path component string */ 2001 rc = next_entry(buf, fp, sizeof(u32)); 2002 if (rc) 2003 return rc; 2004 len = le32_to_cpu(buf[0]); 2005 2006 /* path component string */ 2007 rc = str_read(&name, GFP_KERNEL, fp, len); 2008 if (rc) 2009 return rc; 2010 2011 rc = next_entry(buf, fp, sizeof(u32) * 3); 2012 if (rc) 2013 goto out; 2014 2015 ttype = le32_to_cpu(buf[0]); 2016 tclass = le32_to_cpu(buf[1]); 2017 2018 ndatum = le32_to_cpu(buf[2]); 2019 if (ndatum == 0) { 2020 pr_err("SELinux: Filename transition key with no datum\n"); 2021 rc = -ENOENT; 2022 goto out; 2023 } 2024 2025 dst = &first; 2026 for (i = 0; i < ndatum; i++) { 2027 rc = -ENOMEM; 2028 datum = kmalloc(sizeof(*datum), GFP_KERNEL); 2029 if (!datum) 2030 goto out; 2031 2032 datum->next = NULL; 2033 *dst = datum; 2034 2035 /* ebitmap_read() will at least init the bitmap */ 2036 rc = ebitmap_read(&datum->stypes, fp); 2037 if (rc) 2038 goto out; 2039 2040 rc = next_entry(buf, fp, sizeof(u32)); 2041 if (rc) 2042 goto out; 2043 2044 datum->otype = le32_to_cpu(buf[0]); 2045 2046 dst = &datum->next; 2047 } 2048 2049 rc = -ENOMEM; 2050 ft = kmalloc(sizeof(*ft), GFP_KERNEL); 2051 if (!ft) 2052 goto out; 2053 2054 ft->ttype = ttype; 2055 ft->tclass = tclass; 2056 ft->name = name; 2057 2058 rc = hashtab_insert(&p->filename_trans, ft, first, 2059 filenametr_key_params); 2060 if (rc == -EEXIST) 2061 pr_err("SELinux: Duplicate filename transition key\n"); 2062 if (rc) 2063 goto out; 2064 2065 return ebitmap_set_bit(&p->filename_trans_ttypes, ttype, 1); 2066 2067 out: 2068 kfree(ft); 2069 kfree(name); 2070 while (first) { 2071 datum = first; 2072 first = first->next; 2073 2074 ebitmap_destroy(&datum->stypes); 2075 kfree(datum); 2076 } 2077 return rc; 2078 } 2079 2080 static int filename_trans_read(struct policydb *p, void *fp) 2081 { 2082 u32 nel, i; 2083 __le32 buf[1]; 2084 int rc; 2085 2086 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS) 2087 return 0; 2088 2089 rc = next_entry(buf, fp, sizeof(u32)); 2090 if (rc) 2091 return rc; 2092 nel = le32_to_cpu(buf[0]); 2093 2094 if (p->policyvers < POLICYDB_VERSION_COMP_FTRANS) { 2095 p->compat_filename_trans_count = nel; 2096 2097 rc = hashtab_init(&p->filename_trans, (1 << 11)); 2098 if (rc) 2099 return rc; 2100 2101 for (i = 0; i < nel; i++) { 2102 rc = filename_trans_read_helper_compat(p, fp); 2103 if (rc) 2104 return rc; 2105 } 2106 } else { 2107 rc = hashtab_init(&p->filename_trans, nel); 2108 if (rc) 2109 return rc; 2110 2111 for (i = 0; i < nel; i++) { 2112 rc = filename_trans_read_helper(p, fp); 2113 if (rc) 2114 return rc; 2115 } 2116 } 2117 hash_eval(&p->filename_trans, "filenametr"); 2118 return 0; 2119 } 2120 2121 static int genfs_read(struct policydb *p, void *fp) 2122 { 2123 int rc; 2124 u32 i, j, nel, nel2, len, len2; 2125 __le32 buf[1]; 2126 struct ocontext *l, *c; 2127 struct ocontext *newc = NULL; 2128 struct genfs *genfs_p, *genfs; 2129 struct genfs *newgenfs = NULL; 2130 2131 rc = next_entry(buf, fp, sizeof(u32)); 2132 if (rc) 2133 return rc; 2134 nel = le32_to_cpu(buf[0]); 2135 2136 for (i = 0; i < nel; i++) { 2137 rc = next_entry(buf, fp, sizeof(u32)); 2138 if (rc) 2139 goto out; 2140 len = le32_to_cpu(buf[0]); 2141 2142 rc = -ENOMEM; 2143 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL); 2144 if (!newgenfs) 2145 goto out; 2146 2147 rc = str_read(&newgenfs->fstype, GFP_KERNEL, fp, len); 2148 if (rc) 2149 goto out; 2150 2151 for (genfs_p = NULL, genfs = p->genfs; genfs; 2152 genfs_p = genfs, genfs = genfs->next) { 2153 rc = -EINVAL; 2154 if (strcmp(newgenfs->fstype, genfs->fstype) == 0) { 2155 pr_err("SELinux: dup genfs fstype %s\n", 2156 newgenfs->fstype); 2157 goto out; 2158 } 2159 if (strcmp(newgenfs->fstype, genfs->fstype) < 0) 2160 break; 2161 } 2162 newgenfs->next = genfs; 2163 if (genfs_p) 2164 genfs_p->next = newgenfs; 2165 else 2166 p->genfs = newgenfs; 2167 genfs = newgenfs; 2168 newgenfs = NULL; 2169 2170 rc = next_entry(buf, fp, sizeof(u32)); 2171 if (rc) 2172 goto out; 2173 2174 nel2 = le32_to_cpu(buf[0]); 2175 for (j = 0; j < nel2; j++) { 2176 rc = next_entry(buf, fp, sizeof(u32)); 2177 if (rc) 2178 goto out; 2179 len = le32_to_cpu(buf[0]); 2180 2181 rc = -ENOMEM; 2182 newc = kzalloc(sizeof(*newc), GFP_KERNEL); 2183 if (!newc) 2184 goto out; 2185 2186 rc = str_read(&newc->u.name, GFP_KERNEL, fp, len); 2187 if (rc) 2188 goto out; 2189 2190 rc = next_entry(buf, fp, sizeof(u32)); 2191 if (rc) 2192 goto out; 2193 2194 newc->v.sclass = le32_to_cpu(buf[0]); 2195 rc = context_read_and_validate(&newc->context[0], p, fp); 2196 if (rc) 2197 goto out; 2198 2199 for (l = NULL, c = genfs->head; c; 2200 l = c, c = c->next) { 2201 rc = -EINVAL; 2202 if (!strcmp(newc->u.name, c->u.name) && 2203 (!c->v.sclass || !newc->v.sclass || 2204 newc->v.sclass == c->v.sclass)) { 2205 pr_err("SELinux: dup genfs entry (%s,%s)\n", 2206 genfs->fstype, c->u.name); 2207 goto out; 2208 } 2209 len = strlen(newc->u.name); 2210 len2 = strlen(c->u.name); 2211 if (len > len2) 2212 break; 2213 } 2214 2215 newc->next = c; 2216 if (l) 2217 l->next = newc; 2218 else 2219 genfs->head = newc; 2220 newc = NULL; 2221 } 2222 } 2223 rc = 0; 2224 out: 2225 if (newgenfs) { 2226 kfree(newgenfs->fstype); 2227 kfree(newgenfs); 2228 } 2229 ocontext_destroy(newc, OCON_FSUSE); 2230 2231 return rc; 2232 } 2233 2234 static int ocontext_read(struct policydb *p, const struct policydb_compat_info *info, 2235 void *fp) 2236 { 2237 int rc; 2238 unsigned int i; 2239 u32 j, nel, len; 2240 __be64 prefixbuf[1]; 2241 __le32 buf[3]; 2242 struct ocontext *l, *c; 2243 u32 nodebuf[8]; 2244 2245 for (i = 0; i < info->ocon_num; i++) { 2246 rc = next_entry(buf, fp, sizeof(u32)); 2247 if (rc) 2248 goto out; 2249 nel = le32_to_cpu(buf[0]); 2250 2251 l = NULL; 2252 for (j = 0; j < nel; j++) { 2253 rc = -ENOMEM; 2254 c = kzalloc(sizeof(*c), GFP_KERNEL); 2255 if (!c) 2256 goto out; 2257 if (l) 2258 l->next = c; 2259 else 2260 p->ocontexts[i] = c; 2261 l = c; 2262 2263 switch (i) { 2264 case OCON_ISID: 2265 rc = next_entry(buf, fp, sizeof(u32)); 2266 if (rc) 2267 goto out; 2268 2269 c->sid[0] = le32_to_cpu(buf[0]); 2270 rc = context_read_and_validate(&c->context[0], p, fp); 2271 if (rc) 2272 goto out; 2273 break; 2274 case OCON_FS: 2275 case OCON_NETIF: 2276 rc = next_entry(buf, fp, sizeof(u32)); 2277 if (rc) 2278 goto out; 2279 len = le32_to_cpu(buf[0]); 2280 2281 rc = str_read(&c->u.name, GFP_KERNEL, fp, len); 2282 if (rc) 2283 goto out; 2284 2285 if (i == OCON_FS) 2286 pr_warn("SELinux: void and deprecated fs ocon %s\n", 2287 c->u.name); 2288 2289 rc = context_read_and_validate(&c->context[0], p, fp); 2290 if (rc) 2291 goto out; 2292 rc = context_read_and_validate(&c->context[1], p, fp); 2293 if (rc) 2294 goto out; 2295 break; 2296 case OCON_PORT: 2297 rc = next_entry(buf, fp, sizeof(u32)*3); 2298 if (rc) 2299 goto out; 2300 c->u.port.protocol = le32_to_cpu(buf[0]); 2301 c->u.port.low_port = le32_to_cpu(buf[1]); 2302 c->u.port.high_port = le32_to_cpu(buf[2]); 2303 rc = context_read_and_validate(&c->context[0], p, fp); 2304 if (rc) 2305 goto out; 2306 break; 2307 case OCON_NODE: 2308 rc = next_entry(nodebuf, fp, sizeof(u32) * 2); 2309 if (rc) 2310 goto out; 2311 c->u.node.addr = nodebuf[0]; /* network order */ 2312 c->u.node.mask = nodebuf[1]; /* network order */ 2313 rc = context_read_and_validate(&c->context[0], p, fp); 2314 if (rc) 2315 goto out; 2316 break; 2317 case OCON_FSUSE: 2318 rc = next_entry(buf, fp, sizeof(u32)*2); 2319 if (rc) 2320 goto out; 2321 2322 rc = -EINVAL; 2323 c->v.behavior = le32_to_cpu(buf[0]); 2324 /* Determined at runtime, not in policy DB. */ 2325 if (c->v.behavior == SECURITY_FS_USE_MNTPOINT) 2326 goto out; 2327 if (c->v.behavior > SECURITY_FS_USE_MAX) 2328 goto out; 2329 2330 len = le32_to_cpu(buf[1]); 2331 rc = str_read(&c->u.name, GFP_KERNEL, fp, len); 2332 if (rc) 2333 goto out; 2334 2335 rc = context_read_and_validate(&c->context[0], p, fp); 2336 if (rc) 2337 goto out; 2338 break; 2339 case OCON_NODE6: { 2340 int k; 2341 2342 rc = next_entry(nodebuf, fp, sizeof(u32) * 8); 2343 if (rc) 2344 goto out; 2345 for (k = 0; k < 4; k++) 2346 c->u.node6.addr[k] = nodebuf[k]; 2347 for (k = 0; k < 4; k++) 2348 c->u.node6.mask[k] = nodebuf[k+4]; 2349 rc = context_read_and_validate(&c->context[0], p, fp); 2350 if (rc) 2351 goto out; 2352 break; 2353 } 2354 case OCON_IBPKEY: { 2355 u32 pkey_lo, pkey_hi; 2356 2357 rc = next_entry(prefixbuf, fp, sizeof(u64)); 2358 if (rc) 2359 goto out; 2360 2361 /* we need to have subnet_prefix in CPU order */ 2362 c->u.ibpkey.subnet_prefix = be64_to_cpu(prefixbuf[0]); 2363 2364 rc = next_entry(buf, fp, sizeof(u32) * 2); 2365 if (rc) 2366 goto out; 2367 2368 pkey_lo = le32_to_cpu(buf[0]); 2369 pkey_hi = le32_to_cpu(buf[1]); 2370 2371 if (pkey_lo > U16_MAX || pkey_hi > U16_MAX) { 2372 rc = -EINVAL; 2373 goto out; 2374 } 2375 2376 c->u.ibpkey.low_pkey = pkey_lo; 2377 c->u.ibpkey.high_pkey = pkey_hi; 2378 2379 rc = context_read_and_validate(&c->context[0], 2380 p, 2381 fp); 2382 if (rc) 2383 goto out; 2384 break; 2385 } 2386 case OCON_IBENDPORT: { 2387 u32 port; 2388 2389 rc = next_entry(buf, fp, sizeof(u32) * 2); 2390 if (rc) 2391 goto out; 2392 len = le32_to_cpu(buf[0]); 2393 2394 rc = str_read(&c->u.ibendport.dev_name, GFP_KERNEL, fp, len); 2395 if (rc) 2396 goto out; 2397 2398 port = le32_to_cpu(buf[1]); 2399 if (port > U8_MAX || port == 0) { 2400 rc = -EINVAL; 2401 goto out; 2402 } 2403 2404 c->u.ibendport.port = port; 2405 2406 rc = context_read_and_validate(&c->context[0], 2407 p, 2408 fp); 2409 if (rc) 2410 goto out; 2411 break; 2412 } /* end case */ 2413 } /* end switch */ 2414 } 2415 } 2416 rc = 0; 2417 out: 2418 return rc; 2419 } 2420 2421 /* 2422 * Read the configuration data from a policy database binary 2423 * representation file into a policy database structure. 2424 */ 2425 int policydb_read(struct policydb *p, void *fp) 2426 { 2427 struct role_allow *ra, *lra; 2428 struct role_trans_key *rtk = NULL; 2429 struct role_trans_datum *rtd = NULL; 2430 int rc; 2431 __le32 buf[4]; 2432 u32 i, j, len, nprim, nel, perm; 2433 2434 char *policydb_str; 2435 const struct policydb_compat_info *info; 2436 2437 policydb_init(p); 2438 2439 /* Read the magic number and string length. */ 2440 rc = next_entry(buf, fp, sizeof(u32) * 2); 2441 if (rc) 2442 goto bad; 2443 2444 rc = -EINVAL; 2445 if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) { 2446 pr_err("SELinux: policydb magic number 0x%x does " 2447 "not match expected magic number 0x%x\n", 2448 le32_to_cpu(buf[0]), POLICYDB_MAGIC); 2449 goto bad; 2450 } 2451 2452 rc = -EINVAL; 2453 len = le32_to_cpu(buf[1]); 2454 if (len != strlen(POLICYDB_STRING)) { 2455 pr_err("SELinux: policydb string length %d does not " 2456 "match expected length %zu\n", 2457 len, strlen(POLICYDB_STRING)); 2458 goto bad; 2459 } 2460 2461 rc = -ENOMEM; 2462 policydb_str = kmalloc(len + 1, GFP_KERNEL); 2463 if (!policydb_str) { 2464 pr_err("SELinux: unable to allocate memory for policydb " 2465 "string of length %d\n", len); 2466 goto bad; 2467 } 2468 2469 rc = next_entry(policydb_str, fp, len); 2470 if (rc) { 2471 pr_err("SELinux: truncated policydb string identifier\n"); 2472 kfree(policydb_str); 2473 goto bad; 2474 } 2475 2476 rc = -EINVAL; 2477 policydb_str[len] = '\0'; 2478 if (strcmp(policydb_str, POLICYDB_STRING)) { 2479 pr_err("SELinux: policydb string %s does not match " 2480 "my string %s\n", policydb_str, POLICYDB_STRING); 2481 kfree(policydb_str); 2482 goto bad; 2483 } 2484 /* Done with policydb_str. */ 2485 kfree(policydb_str); 2486 policydb_str = NULL; 2487 2488 /* Read the version and table sizes. */ 2489 rc = next_entry(buf, fp, sizeof(u32)*4); 2490 if (rc) 2491 goto bad; 2492 2493 rc = -EINVAL; 2494 p->policyvers = le32_to_cpu(buf[0]); 2495 if (p->policyvers < POLICYDB_VERSION_MIN || 2496 p->policyvers > POLICYDB_VERSION_MAX) { 2497 pr_err("SELinux: policydb version %d does not match " 2498 "my version range %d-%d\n", 2499 le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX); 2500 goto bad; 2501 } 2502 2503 if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) { 2504 p->mls_enabled = 1; 2505 2506 rc = -EINVAL; 2507 if (p->policyvers < POLICYDB_VERSION_MLS) { 2508 pr_err("SELinux: security policydb version %d " 2509 "(MLS) not backwards compatible\n", 2510 p->policyvers); 2511 goto bad; 2512 } 2513 } 2514 p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN); 2515 p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN); 2516 2517 if (p->policyvers >= POLICYDB_VERSION_POLCAP) { 2518 rc = ebitmap_read(&p->policycaps, fp); 2519 if (rc) 2520 goto bad; 2521 } 2522 2523 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) { 2524 rc = ebitmap_read(&p->permissive_map, fp); 2525 if (rc) 2526 goto bad; 2527 } 2528 2529 rc = -EINVAL; 2530 info = policydb_lookup_compat(p->policyvers); 2531 if (!info) { 2532 pr_err("SELinux: unable to find policy compat info " 2533 "for version %d\n", p->policyvers); 2534 goto bad; 2535 } 2536 2537 rc = -EINVAL; 2538 if (le32_to_cpu(buf[2]) != info->sym_num || 2539 le32_to_cpu(buf[3]) != info->ocon_num) { 2540 pr_err("SELinux: policydb table sizes (%d,%d) do " 2541 "not match mine (%d,%d)\n", le32_to_cpu(buf[2]), 2542 le32_to_cpu(buf[3]), 2543 info->sym_num, info->ocon_num); 2544 goto bad; 2545 } 2546 2547 for (i = 0; i < info->sym_num; i++) { 2548 rc = next_entry(buf, fp, sizeof(u32)*2); 2549 if (rc) 2550 goto bad; 2551 nprim = le32_to_cpu(buf[0]); 2552 nel = le32_to_cpu(buf[1]); 2553 2554 rc = symtab_init(&p->symtab[i], nel); 2555 if (rc) 2556 goto out; 2557 2558 if (i == SYM_ROLES) { 2559 rc = roles_init(p); 2560 if (rc) 2561 goto out; 2562 } 2563 2564 for (j = 0; j < nel; j++) { 2565 rc = read_f[i](p, &p->symtab[i], fp); 2566 if (rc) 2567 goto bad; 2568 } 2569 2570 p->symtab[i].nprim = nprim; 2571 } 2572 2573 rc = -EINVAL; 2574 p->process_class = string_to_security_class(p, "process"); 2575 if (!p->process_class) { 2576 pr_err("SELinux: process class is required, not defined in policy\n"); 2577 goto bad; 2578 } 2579 2580 rc = avtab_read(&p->te_avtab, fp, p); 2581 if (rc) 2582 goto bad; 2583 2584 if (p->policyvers >= POLICYDB_VERSION_BOOL) { 2585 rc = cond_read_list(p, fp); 2586 if (rc) 2587 goto bad; 2588 } 2589 2590 rc = next_entry(buf, fp, sizeof(u32)); 2591 if (rc) 2592 goto bad; 2593 nel = le32_to_cpu(buf[0]); 2594 2595 rc = hashtab_init(&p->role_tr, nel); 2596 if (rc) 2597 goto bad; 2598 for (i = 0; i < nel; i++) { 2599 rc = -ENOMEM; 2600 rtk = kmalloc(sizeof(*rtk), GFP_KERNEL); 2601 if (!rtk) 2602 goto bad; 2603 2604 rc = -ENOMEM; 2605 rtd = kmalloc(sizeof(*rtd), GFP_KERNEL); 2606 if (!rtd) 2607 goto bad; 2608 2609 rc = next_entry(buf, fp, sizeof(u32)*3); 2610 if (rc) 2611 goto bad; 2612 2613 rtk->role = le32_to_cpu(buf[0]); 2614 rtk->type = le32_to_cpu(buf[1]); 2615 rtd->new_role = le32_to_cpu(buf[2]); 2616 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) { 2617 rc = next_entry(buf, fp, sizeof(u32)); 2618 if (rc) 2619 goto bad; 2620 rtk->tclass = le32_to_cpu(buf[0]); 2621 } else 2622 rtk->tclass = p->process_class; 2623 2624 rc = -EINVAL; 2625 if (!policydb_role_isvalid(p, rtk->role) || 2626 !policydb_type_isvalid(p, rtk->type) || 2627 !policydb_class_isvalid(p, rtk->tclass) || 2628 !policydb_role_isvalid(p, rtd->new_role)) 2629 goto bad; 2630 2631 rc = hashtab_insert(&p->role_tr, rtk, rtd, roletr_key_params); 2632 if (rc) 2633 goto bad; 2634 2635 rtk = NULL; 2636 rtd = NULL; 2637 } 2638 2639 rc = next_entry(buf, fp, sizeof(u32)); 2640 if (rc) 2641 goto bad; 2642 nel = le32_to_cpu(buf[0]); 2643 lra = NULL; 2644 for (i = 0; i < nel; i++) { 2645 rc = -ENOMEM; 2646 ra = kzalloc(sizeof(*ra), GFP_KERNEL); 2647 if (!ra) 2648 goto bad; 2649 if (lra) 2650 lra->next = ra; 2651 else 2652 p->role_allow = ra; 2653 rc = next_entry(buf, fp, sizeof(u32)*2); 2654 if (rc) 2655 goto bad; 2656 2657 rc = -EINVAL; 2658 ra->role = le32_to_cpu(buf[0]); 2659 ra->new_role = le32_to_cpu(buf[1]); 2660 if (!policydb_role_isvalid(p, ra->role) || 2661 !policydb_role_isvalid(p, ra->new_role)) 2662 goto bad; 2663 lra = ra; 2664 } 2665 2666 rc = filename_trans_read(p, fp); 2667 if (rc) 2668 goto bad; 2669 2670 rc = policydb_index(p); 2671 if (rc) 2672 goto bad; 2673 2674 rc = -EINVAL; 2675 perm = string_to_av_perm(p, p->process_class, "transition"); 2676 if (!perm) { 2677 pr_err("SELinux: process transition permission is required, not defined in policy\n"); 2678 goto bad; 2679 } 2680 p->process_trans_perms = perm; 2681 perm = string_to_av_perm(p, p->process_class, "dyntransition"); 2682 if (!perm) { 2683 pr_err("SELinux: process dyntransition permission is required, not defined in policy\n"); 2684 goto bad; 2685 } 2686 p->process_trans_perms |= perm; 2687 2688 rc = ocontext_read(p, info, fp); 2689 if (rc) 2690 goto bad; 2691 2692 rc = genfs_read(p, fp); 2693 if (rc) 2694 goto bad; 2695 2696 rc = range_read(p, fp); 2697 if (rc) 2698 goto bad; 2699 2700 rc = -ENOMEM; 2701 p->type_attr_map_array = kvcalloc(p->p_types.nprim, 2702 sizeof(*p->type_attr_map_array), 2703 GFP_KERNEL); 2704 if (!p->type_attr_map_array) 2705 goto bad; 2706 2707 /* just in case ebitmap_init() becomes more than just a memset(0): */ 2708 for (i = 0; i < p->p_types.nprim; i++) 2709 ebitmap_init(&p->type_attr_map_array[i]); 2710 2711 for (i = 0; i < p->p_types.nprim; i++) { 2712 struct ebitmap *e = &p->type_attr_map_array[i]; 2713 2714 if (p->policyvers >= POLICYDB_VERSION_AVTAB) { 2715 rc = ebitmap_read(e, fp); 2716 if (rc) 2717 goto bad; 2718 } 2719 /* add the type itself as the degenerate case */ 2720 rc = ebitmap_set_bit(e, i, 1); 2721 if (rc) 2722 goto bad; 2723 } 2724 2725 rc = policydb_bounds_sanity_check(p); 2726 if (rc) 2727 goto bad; 2728 2729 rc = 0; 2730 out: 2731 return rc; 2732 bad: 2733 kfree(rtk); 2734 kfree(rtd); 2735 policydb_destroy(p); 2736 goto out; 2737 } 2738 2739 /* 2740 * Write a MLS level structure to a policydb binary 2741 * representation file. 2742 */ 2743 static int mls_write_level(struct mls_level *l, void *fp) 2744 { 2745 __le32 buf[1]; 2746 int rc; 2747 2748 buf[0] = cpu_to_le32(l->sens); 2749 rc = put_entry(buf, sizeof(u32), 1, fp); 2750 if (rc) 2751 return rc; 2752 2753 rc = ebitmap_write(&l->cat, fp); 2754 if (rc) 2755 return rc; 2756 2757 return 0; 2758 } 2759 2760 /* 2761 * Write a MLS range structure to a policydb binary 2762 * representation file. 2763 */ 2764 static int mls_write_range_helper(struct mls_range *r, void *fp) 2765 { 2766 __le32 buf[3]; 2767 size_t items; 2768 int rc, eq; 2769 2770 eq = mls_level_eq(&r->level[1], &r->level[0]); 2771 2772 if (eq) 2773 items = 2; 2774 else 2775 items = 3; 2776 buf[0] = cpu_to_le32(items-1); 2777 buf[1] = cpu_to_le32(r->level[0].sens); 2778 if (!eq) 2779 buf[2] = cpu_to_le32(r->level[1].sens); 2780 2781 BUG_ON(items > ARRAY_SIZE(buf)); 2782 2783 rc = put_entry(buf, sizeof(u32), items, fp); 2784 if (rc) 2785 return rc; 2786 2787 rc = ebitmap_write(&r->level[0].cat, fp); 2788 if (rc) 2789 return rc; 2790 if (!eq) { 2791 rc = ebitmap_write(&r->level[1].cat, fp); 2792 if (rc) 2793 return rc; 2794 } 2795 2796 return 0; 2797 } 2798 2799 static int sens_write(void *vkey, void *datum, void *ptr) 2800 { 2801 char *key = vkey; 2802 struct level_datum *levdatum = datum; 2803 struct policy_data *pd = ptr; 2804 void *fp = pd->fp; 2805 __le32 buf[2]; 2806 size_t len; 2807 int rc; 2808 2809 len = strlen(key); 2810 buf[0] = cpu_to_le32(len); 2811 buf[1] = cpu_to_le32(levdatum->isalias); 2812 rc = put_entry(buf, sizeof(u32), 2, fp); 2813 if (rc) 2814 return rc; 2815 2816 rc = put_entry(key, 1, len, fp); 2817 if (rc) 2818 return rc; 2819 2820 rc = mls_write_level(levdatum->level, fp); 2821 if (rc) 2822 return rc; 2823 2824 return 0; 2825 } 2826 2827 static int cat_write(void *vkey, void *datum, void *ptr) 2828 { 2829 char *key = vkey; 2830 struct cat_datum *catdatum = datum; 2831 struct policy_data *pd = ptr; 2832 void *fp = pd->fp; 2833 __le32 buf[3]; 2834 size_t len; 2835 int rc; 2836 2837 len = strlen(key); 2838 buf[0] = cpu_to_le32(len); 2839 buf[1] = cpu_to_le32(catdatum->value); 2840 buf[2] = cpu_to_le32(catdatum->isalias); 2841 rc = put_entry(buf, sizeof(u32), 3, fp); 2842 if (rc) 2843 return rc; 2844 2845 rc = put_entry(key, 1, len, fp); 2846 if (rc) 2847 return rc; 2848 2849 return 0; 2850 } 2851 2852 static int role_trans_write_one(void *key, void *datum, void *ptr) 2853 { 2854 struct role_trans_key *rtk = key; 2855 struct role_trans_datum *rtd = datum; 2856 struct policy_data *pd = ptr; 2857 void *fp = pd->fp; 2858 struct policydb *p = pd->p; 2859 __le32 buf[3]; 2860 int rc; 2861 2862 buf[0] = cpu_to_le32(rtk->role); 2863 buf[1] = cpu_to_le32(rtk->type); 2864 buf[2] = cpu_to_le32(rtd->new_role); 2865 rc = put_entry(buf, sizeof(u32), 3, fp); 2866 if (rc) 2867 return rc; 2868 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) { 2869 buf[0] = cpu_to_le32(rtk->tclass); 2870 rc = put_entry(buf, sizeof(u32), 1, fp); 2871 if (rc) 2872 return rc; 2873 } 2874 return 0; 2875 } 2876 2877 static int role_trans_write(struct policydb *p, void *fp) 2878 { 2879 struct policy_data pd = { .p = p, .fp = fp }; 2880 __le32 buf[1]; 2881 int rc; 2882 2883 buf[0] = cpu_to_le32(p->role_tr.nel); 2884 rc = put_entry(buf, sizeof(u32), 1, fp); 2885 if (rc) 2886 return rc; 2887 2888 return hashtab_map(&p->role_tr, role_trans_write_one, &pd); 2889 } 2890 2891 static int role_allow_write(struct role_allow *r, void *fp) 2892 { 2893 struct role_allow *ra; 2894 __le32 buf[2]; 2895 size_t nel; 2896 int rc; 2897 2898 nel = 0; 2899 for (ra = r; ra; ra = ra->next) 2900 nel++; 2901 buf[0] = cpu_to_le32(nel); 2902 rc = put_entry(buf, sizeof(u32), 1, fp); 2903 if (rc) 2904 return rc; 2905 for (ra = r; ra; ra = ra->next) { 2906 buf[0] = cpu_to_le32(ra->role); 2907 buf[1] = cpu_to_le32(ra->new_role); 2908 rc = put_entry(buf, sizeof(u32), 2, fp); 2909 if (rc) 2910 return rc; 2911 } 2912 return 0; 2913 } 2914 2915 /* 2916 * Write a security context structure 2917 * to a policydb binary representation file. 2918 */ 2919 static int context_write(struct policydb *p, struct context *c, 2920 void *fp) 2921 { 2922 int rc; 2923 __le32 buf[3]; 2924 2925 buf[0] = cpu_to_le32(c->user); 2926 buf[1] = cpu_to_le32(c->role); 2927 buf[2] = cpu_to_le32(c->type); 2928 2929 rc = put_entry(buf, sizeof(u32), 3, fp); 2930 if (rc) 2931 return rc; 2932 2933 rc = mls_write_range_helper(&c->range, fp); 2934 if (rc) 2935 return rc; 2936 2937 return 0; 2938 } 2939 2940 /* 2941 * The following *_write functions are used to 2942 * write the symbol data to a policy database 2943 * binary representation file. 2944 */ 2945 2946 static int perm_write(void *vkey, void *datum, void *fp) 2947 { 2948 char *key = vkey; 2949 struct perm_datum *perdatum = datum; 2950 __le32 buf[2]; 2951 size_t len; 2952 int rc; 2953 2954 len = strlen(key); 2955 buf[0] = cpu_to_le32(len); 2956 buf[1] = cpu_to_le32(perdatum->value); 2957 rc = put_entry(buf, sizeof(u32), 2, fp); 2958 if (rc) 2959 return rc; 2960 2961 rc = put_entry(key, 1, len, fp); 2962 if (rc) 2963 return rc; 2964 2965 return 0; 2966 } 2967 2968 static int common_write(void *vkey, void *datum, void *ptr) 2969 { 2970 char *key = vkey; 2971 struct common_datum *comdatum = datum; 2972 struct policy_data *pd = ptr; 2973 void *fp = pd->fp; 2974 __le32 buf[4]; 2975 size_t len; 2976 int rc; 2977 2978 len = strlen(key); 2979 buf[0] = cpu_to_le32(len); 2980 buf[1] = cpu_to_le32(comdatum->value); 2981 buf[2] = cpu_to_le32(comdatum->permissions.nprim); 2982 buf[3] = cpu_to_le32(comdatum->permissions.table.nel); 2983 rc = put_entry(buf, sizeof(u32), 4, fp); 2984 if (rc) 2985 return rc; 2986 2987 rc = put_entry(key, 1, len, fp); 2988 if (rc) 2989 return rc; 2990 2991 rc = hashtab_map(&comdatum->permissions.table, perm_write, fp); 2992 if (rc) 2993 return rc; 2994 2995 return 0; 2996 } 2997 2998 static int type_set_write(struct type_set *t, void *fp) 2999 { 3000 int rc; 3001 __le32 buf[1]; 3002 3003 if (ebitmap_write(&t->types, fp)) 3004 return -EINVAL; 3005 if (ebitmap_write(&t->negset, fp)) 3006 return -EINVAL; 3007 3008 buf[0] = cpu_to_le32(t->flags); 3009 rc = put_entry(buf, sizeof(u32), 1, fp); 3010 if (rc) 3011 return -EINVAL; 3012 3013 return 0; 3014 } 3015 3016 static int write_cons_helper(struct policydb *p, struct constraint_node *node, 3017 void *fp) 3018 { 3019 struct constraint_node *c; 3020 struct constraint_expr *e; 3021 __le32 buf[3]; 3022 u32 nel; 3023 int rc; 3024 3025 for (c = node; c; c = c->next) { 3026 nel = 0; 3027 for (e = c->expr; e; e = e->next) 3028 nel++; 3029 buf[0] = cpu_to_le32(c->permissions); 3030 buf[1] = cpu_to_le32(nel); 3031 rc = put_entry(buf, sizeof(u32), 2, fp); 3032 if (rc) 3033 return rc; 3034 for (e = c->expr; e; e = e->next) { 3035 buf[0] = cpu_to_le32(e->expr_type); 3036 buf[1] = cpu_to_le32(e->attr); 3037 buf[2] = cpu_to_le32(e->op); 3038 rc = put_entry(buf, sizeof(u32), 3, fp); 3039 if (rc) 3040 return rc; 3041 3042 switch (e->expr_type) { 3043 case CEXPR_NAMES: 3044 rc = ebitmap_write(&e->names, fp); 3045 if (rc) 3046 return rc; 3047 if (p->policyvers >= 3048 POLICYDB_VERSION_CONSTRAINT_NAMES) { 3049 rc = type_set_write(e->type_names, fp); 3050 if (rc) 3051 return rc; 3052 } 3053 break; 3054 default: 3055 break; 3056 } 3057 } 3058 } 3059 3060 return 0; 3061 } 3062 3063 static int class_write(void *vkey, void *datum, void *ptr) 3064 { 3065 char *key = vkey; 3066 struct class_datum *cladatum = datum; 3067 struct policy_data *pd = ptr; 3068 void *fp = pd->fp; 3069 struct policydb *p = pd->p; 3070 struct constraint_node *c; 3071 __le32 buf[6]; 3072 u32 ncons; 3073 size_t len, len2; 3074 int rc; 3075 3076 len = strlen(key); 3077 if (cladatum->comkey) 3078 len2 = strlen(cladatum->comkey); 3079 else 3080 len2 = 0; 3081 3082 ncons = 0; 3083 for (c = cladatum->constraints; c; c = c->next) 3084 ncons++; 3085 3086 buf[0] = cpu_to_le32(len); 3087 buf[1] = cpu_to_le32(len2); 3088 buf[2] = cpu_to_le32(cladatum->value); 3089 buf[3] = cpu_to_le32(cladatum->permissions.nprim); 3090 buf[4] = cpu_to_le32(cladatum->permissions.table.nel); 3091 buf[5] = cpu_to_le32(ncons); 3092 rc = put_entry(buf, sizeof(u32), 6, fp); 3093 if (rc) 3094 return rc; 3095 3096 rc = put_entry(key, 1, len, fp); 3097 if (rc) 3098 return rc; 3099 3100 if (cladatum->comkey) { 3101 rc = put_entry(cladatum->comkey, 1, len2, fp); 3102 if (rc) 3103 return rc; 3104 } 3105 3106 rc = hashtab_map(&cladatum->permissions.table, perm_write, fp); 3107 if (rc) 3108 return rc; 3109 3110 rc = write_cons_helper(p, cladatum->constraints, fp); 3111 if (rc) 3112 return rc; 3113 3114 /* write out the validatetrans rule */ 3115 ncons = 0; 3116 for (c = cladatum->validatetrans; c; c = c->next) 3117 ncons++; 3118 3119 buf[0] = cpu_to_le32(ncons); 3120 rc = put_entry(buf, sizeof(u32), 1, fp); 3121 if (rc) 3122 return rc; 3123 3124 rc = write_cons_helper(p, cladatum->validatetrans, fp); 3125 if (rc) 3126 return rc; 3127 3128 if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) { 3129 buf[0] = cpu_to_le32(cladatum->default_user); 3130 buf[1] = cpu_to_le32(cladatum->default_role); 3131 buf[2] = cpu_to_le32(cladatum->default_range); 3132 3133 rc = put_entry(buf, sizeof(uint32_t), 3, fp); 3134 if (rc) 3135 return rc; 3136 } 3137 3138 if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) { 3139 buf[0] = cpu_to_le32(cladatum->default_type); 3140 rc = put_entry(buf, sizeof(uint32_t), 1, fp); 3141 if (rc) 3142 return rc; 3143 } 3144 3145 return 0; 3146 } 3147 3148 static int role_write(void *vkey, void *datum, void *ptr) 3149 { 3150 char *key = vkey; 3151 struct role_datum *role = datum; 3152 struct policy_data *pd = ptr; 3153 void *fp = pd->fp; 3154 struct policydb *p = pd->p; 3155 __le32 buf[3]; 3156 size_t items, len; 3157 int rc; 3158 3159 len = strlen(key); 3160 items = 0; 3161 buf[items++] = cpu_to_le32(len); 3162 buf[items++] = cpu_to_le32(role->value); 3163 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) 3164 buf[items++] = cpu_to_le32(role->bounds); 3165 3166 BUG_ON(items > ARRAY_SIZE(buf)); 3167 3168 rc = put_entry(buf, sizeof(u32), items, fp); 3169 if (rc) 3170 return rc; 3171 3172 rc = put_entry(key, 1, len, fp); 3173 if (rc) 3174 return rc; 3175 3176 rc = ebitmap_write(&role->dominates, fp); 3177 if (rc) 3178 return rc; 3179 3180 rc = ebitmap_write(&role->types, fp); 3181 if (rc) 3182 return rc; 3183 3184 return 0; 3185 } 3186 3187 static int type_write(void *vkey, void *datum, void *ptr) 3188 { 3189 char *key = vkey; 3190 struct type_datum *typdatum = datum; 3191 struct policy_data *pd = ptr; 3192 struct policydb *p = pd->p; 3193 void *fp = pd->fp; 3194 __le32 buf[4]; 3195 int rc; 3196 size_t items, len; 3197 3198 len = strlen(key); 3199 items = 0; 3200 buf[items++] = cpu_to_le32(len); 3201 buf[items++] = cpu_to_le32(typdatum->value); 3202 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) { 3203 u32 properties = 0; 3204 3205 if (typdatum->primary) 3206 properties |= TYPEDATUM_PROPERTY_PRIMARY; 3207 3208 if (typdatum->attribute) 3209 properties |= TYPEDATUM_PROPERTY_ATTRIBUTE; 3210 3211 buf[items++] = cpu_to_le32(properties); 3212 buf[items++] = cpu_to_le32(typdatum->bounds); 3213 } else { 3214 buf[items++] = cpu_to_le32(typdatum->primary); 3215 } 3216 BUG_ON(items > ARRAY_SIZE(buf)); 3217 rc = put_entry(buf, sizeof(u32), items, fp); 3218 if (rc) 3219 return rc; 3220 3221 rc = put_entry(key, 1, len, fp); 3222 if (rc) 3223 return rc; 3224 3225 return 0; 3226 } 3227 3228 static int user_write(void *vkey, void *datum, void *ptr) 3229 { 3230 char *key = vkey; 3231 struct user_datum *usrdatum = datum; 3232 struct policy_data *pd = ptr; 3233 struct policydb *p = pd->p; 3234 void *fp = pd->fp; 3235 __le32 buf[3]; 3236 size_t items, len; 3237 int rc; 3238 3239 len = strlen(key); 3240 items = 0; 3241 buf[items++] = cpu_to_le32(len); 3242 buf[items++] = cpu_to_le32(usrdatum->value); 3243 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) 3244 buf[items++] = cpu_to_le32(usrdatum->bounds); 3245 BUG_ON(items > ARRAY_SIZE(buf)); 3246 rc = put_entry(buf, sizeof(u32), items, fp); 3247 if (rc) 3248 return rc; 3249 3250 rc = put_entry(key, 1, len, fp); 3251 if (rc) 3252 return rc; 3253 3254 rc = ebitmap_write(&usrdatum->roles, fp); 3255 if (rc) 3256 return rc; 3257 3258 rc = mls_write_range_helper(&usrdatum->range, fp); 3259 if (rc) 3260 return rc; 3261 3262 rc = mls_write_level(&usrdatum->dfltlevel, fp); 3263 if (rc) 3264 return rc; 3265 3266 return 0; 3267 } 3268 3269 static int (*const write_f[SYM_NUM]) (void *key, void *datum, void *datap) = { 3270 common_write, 3271 class_write, 3272 role_write, 3273 type_write, 3274 user_write, 3275 cond_write_bool, 3276 sens_write, 3277 cat_write, 3278 }; 3279 3280 static int ocontext_write(struct policydb *p, const struct policydb_compat_info *info, 3281 void *fp) 3282 { 3283 unsigned int i, j; 3284 int rc; 3285 size_t nel, len; 3286 __be64 prefixbuf[1]; 3287 __le32 buf[3]; 3288 u32 nodebuf[8]; 3289 struct ocontext *c; 3290 for (i = 0; i < info->ocon_num; i++) { 3291 nel = 0; 3292 for (c = p->ocontexts[i]; c; c = c->next) 3293 nel++; 3294 buf[0] = cpu_to_le32(nel); 3295 rc = put_entry(buf, sizeof(u32), 1, fp); 3296 if (rc) 3297 return rc; 3298 for (c = p->ocontexts[i]; c; c = c->next) { 3299 switch (i) { 3300 case OCON_ISID: 3301 buf[0] = cpu_to_le32(c->sid[0]); 3302 rc = put_entry(buf, sizeof(u32), 1, fp); 3303 if (rc) 3304 return rc; 3305 rc = context_write(p, &c->context[0], fp); 3306 if (rc) 3307 return rc; 3308 break; 3309 case OCON_FS: 3310 case OCON_NETIF: 3311 len = strlen(c->u.name); 3312 buf[0] = cpu_to_le32(len); 3313 rc = put_entry(buf, sizeof(u32), 1, fp); 3314 if (rc) 3315 return rc; 3316 rc = put_entry(c->u.name, 1, len, fp); 3317 if (rc) 3318 return rc; 3319 rc = context_write(p, &c->context[0], fp); 3320 if (rc) 3321 return rc; 3322 rc = context_write(p, &c->context[1], fp); 3323 if (rc) 3324 return rc; 3325 break; 3326 case OCON_PORT: 3327 buf[0] = cpu_to_le32(c->u.port.protocol); 3328 buf[1] = cpu_to_le32(c->u.port.low_port); 3329 buf[2] = cpu_to_le32(c->u.port.high_port); 3330 rc = put_entry(buf, sizeof(u32), 3, fp); 3331 if (rc) 3332 return rc; 3333 rc = context_write(p, &c->context[0], fp); 3334 if (rc) 3335 return rc; 3336 break; 3337 case OCON_NODE: 3338 nodebuf[0] = c->u.node.addr; /* network order */ 3339 nodebuf[1] = c->u.node.mask; /* network order */ 3340 rc = put_entry(nodebuf, sizeof(u32), 2, fp); 3341 if (rc) 3342 return rc; 3343 rc = context_write(p, &c->context[0], fp); 3344 if (rc) 3345 return rc; 3346 break; 3347 case OCON_FSUSE: 3348 buf[0] = cpu_to_le32(c->v.behavior); 3349 len = strlen(c->u.name); 3350 buf[1] = cpu_to_le32(len); 3351 rc = put_entry(buf, sizeof(u32), 2, fp); 3352 if (rc) 3353 return rc; 3354 rc = put_entry(c->u.name, 1, len, fp); 3355 if (rc) 3356 return rc; 3357 rc = context_write(p, &c->context[0], fp); 3358 if (rc) 3359 return rc; 3360 break; 3361 case OCON_NODE6: 3362 for (j = 0; j < 4; j++) 3363 nodebuf[j] = c->u.node6.addr[j]; /* network order */ 3364 for (j = 0; j < 4; j++) 3365 nodebuf[j + 4] = c->u.node6.mask[j]; /* network order */ 3366 rc = put_entry(nodebuf, sizeof(u32), 8, fp); 3367 if (rc) 3368 return rc; 3369 rc = context_write(p, &c->context[0], fp); 3370 if (rc) 3371 return rc; 3372 break; 3373 case OCON_IBPKEY: 3374 /* subnet_prefix is in CPU order */ 3375 prefixbuf[0] = cpu_to_be64(c->u.ibpkey.subnet_prefix); 3376 3377 rc = put_entry(prefixbuf, sizeof(u64), 1, fp); 3378 if (rc) 3379 return rc; 3380 3381 buf[0] = cpu_to_le32(c->u.ibpkey.low_pkey); 3382 buf[1] = cpu_to_le32(c->u.ibpkey.high_pkey); 3383 3384 rc = put_entry(buf, sizeof(u32), 2, fp); 3385 if (rc) 3386 return rc; 3387 rc = context_write(p, &c->context[0], fp); 3388 if (rc) 3389 return rc; 3390 break; 3391 case OCON_IBENDPORT: 3392 len = strlen(c->u.ibendport.dev_name); 3393 buf[0] = cpu_to_le32(len); 3394 buf[1] = cpu_to_le32(c->u.ibendport.port); 3395 rc = put_entry(buf, sizeof(u32), 2, fp); 3396 if (rc) 3397 return rc; 3398 rc = put_entry(c->u.ibendport.dev_name, 1, len, fp); 3399 if (rc) 3400 return rc; 3401 rc = context_write(p, &c->context[0], fp); 3402 if (rc) 3403 return rc; 3404 break; 3405 } 3406 } 3407 } 3408 return 0; 3409 } 3410 3411 static int genfs_write(struct policydb *p, void *fp) 3412 { 3413 struct genfs *genfs; 3414 struct ocontext *c; 3415 size_t len; 3416 __le32 buf[1]; 3417 int rc; 3418 3419 len = 0; 3420 for (genfs = p->genfs; genfs; genfs = genfs->next) 3421 len++; 3422 buf[0] = cpu_to_le32(len); 3423 rc = put_entry(buf, sizeof(u32), 1, fp); 3424 if (rc) 3425 return rc; 3426 for (genfs = p->genfs; genfs; genfs = genfs->next) { 3427 len = strlen(genfs->fstype); 3428 buf[0] = cpu_to_le32(len); 3429 rc = put_entry(buf, sizeof(u32), 1, fp); 3430 if (rc) 3431 return rc; 3432 rc = put_entry(genfs->fstype, 1, len, fp); 3433 if (rc) 3434 return rc; 3435 len = 0; 3436 for (c = genfs->head; c; c = c->next) 3437 len++; 3438 buf[0] = cpu_to_le32(len); 3439 rc = put_entry(buf, sizeof(u32), 1, fp); 3440 if (rc) 3441 return rc; 3442 for (c = genfs->head; c; c = c->next) { 3443 len = strlen(c->u.name); 3444 buf[0] = cpu_to_le32(len); 3445 rc = put_entry(buf, sizeof(u32), 1, fp); 3446 if (rc) 3447 return rc; 3448 rc = put_entry(c->u.name, 1, len, fp); 3449 if (rc) 3450 return rc; 3451 buf[0] = cpu_to_le32(c->v.sclass); 3452 rc = put_entry(buf, sizeof(u32), 1, fp); 3453 if (rc) 3454 return rc; 3455 rc = context_write(p, &c->context[0], fp); 3456 if (rc) 3457 return rc; 3458 } 3459 } 3460 return 0; 3461 } 3462 3463 static int range_write_helper(void *key, void *data, void *ptr) 3464 { 3465 __le32 buf[2]; 3466 struct range_trans *rt = key; 3467 struct mls_range *r = data; 3468 struct policy_data *pd = ptr; 3469 void *fp = pd->fp; 3470 struct policydb *p = pd->p; 3471 int rc; 3472 3473 buf[0] = cpu_to_le32(rt->source_type); 3474 buf[1] = cpu_to_le32(rt->target_type); 3475 rc = put_entry(buf, sizeof(u32), 2, fp); 3476 if (rc) 3477 return rc; 3478 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) { 3479 buf[0] = cpu_to_le32(rt->target_class); 3480 rc = put_entry(buf, sizeof(u32), 1, fp); 3481 if (rc) 3482 return rc; 3483 } 3484 rc = mls_write_range_helper(r, fp); 3485 if (rc) 3486 return rc; 3487 3488 return 0; 3489 } 3490 3491 static int range_write(struct policydb *p, void *fp) 3492 { 3493 __le32 buf[1]; 3494 int rc; 3495 struct policy_data pd; 3496 3497 pd.p = p; 3498 pd.fp = fp; 3499 3500 buf[0] = cpu_to_le32(p->range_tr.nel); 3501 rc = put_entry(buf, sizeof(u32), 1, fp); 3502 if (rc) 3503 return rc; 3504 3505 /* actually write all of the entries */ 3506 rc = hashtab_map(&p->range_tr, range_write_helper, &pd); 3507 if (rc) 3508 return rc; 3509 3510 return 0; 3511 } 3512 3513 static int filename_write_helper_compat(void *key, void *data, void *ptr) 3514 { 3515 struct filename_trans_key *ft = key; 3516 struct filename_trans_datum *datum = data; 3517 struct ebitmap_node *node; 3518 void *fp = ptr; 3519 __le32 buf[4]; 3520 int rc; 3521 u32 bit, len = strlen(ft->name); 3522 3523 do { 3524 ebitmap_for_each_positive_bit(&datum->stypes, node, bit) { 3525 buf[0] = cpu_to_le32(len); 3526 rc = put_entry(buf, sizeof(u32), 1, fp); 3527 if (rc) 3528 return rc; 3529 3530 rc = put_entry(ft->name, sizeof(char), len, fp); 3531 if (rc) 3532 return rc; 3533 3534 buf[0] = cpu_to_le32(bit + 1); 3535 buf[1] = cpu_to_le32(ft->ttype); 3536 buf[2] = cpu_to_le32(ft->tclass); 3537 buf[3] = cpu_to_le32(datum->otype); 3538 3539 rc = put_entry(buf, sizeof(u32), 4, fp); 3540 if (rc) 3541 return rc; 3542 } 3543 3544 datum = datum->next; 3545 } while (unlikely(datum)); 3546 3547 return 0; 3548 } 3549 3550 static int filename_write_helper(void *key, void *data, void *ptr) 3551 { 3552 struct filename_trans_key *ft = key; 3553 struct filename_trans_datum *datum; 3554 void *fp = ptr; 3555 __le32 buf[3]; 3556 int rc; 3557 u32 ndatum, len = strlen(ft->name); 3558 3559 buf[0] = cpu_to_le32(len); 3560 rc = put_entry(buf, sizeof(u32), 1, fp); 3561 if (rc) 3562 return rc; 3563 3564 rc = put_entry(ft->name, sizeof(char), len, fp); 3565 if (rc) 3566 return rc; 3567 3568 ndatum = 0; 3569 datum = data; 3570 do { 3571 ndatum++; 3572 datum = datum->next; 3573 } while (unlikely(datum)); 3574 3575 buf[0] = cpu_to_le32(ft->ttype); 3576 buf[1] = cpu_to_le32(ft->tclass); 3577 buf[2] = cpu_to_le32(ndatum); 3578 rc = put_entry(buf, sizeof(u32), 3, fp); 3579 if (rc) 3580 return rc; 3581 3582 datum = data; 3583 do { 3584 rc = ebitmap_write(&datum->stypes, fp); 3585 if (rc) 3586 return rc; 3587 3588 buf[0] = cpu_to_le32(datum->otype); 3589 rc = put_entry(buf, sizeof(u32), 1, fp); 3590 if (rc) 3591 return rc; 3592 3593 datum = datum->next; 3594 } while (unlikely(datum)); 3595 3596 return 0; 3597 } 3598 3599 static int filename_trans_write(struct policydb *p, void *fp) 3600 { 3601 __le32 buf[1]; 3602 int rc; 3603 3604 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS) 3605 return 0; 3606 3607 if (p->policyvers < POLICYDB_VERSION_COMP_FTRANS) { 3608 buf[0] = cpu_to_le32(p->compat_filename_trans_count); 3609 rc = put_entry(buf, sizeof(u32), 1, fp); 3610 if (rc) 3611 return rc; 3612 3613 rc = hashtab_map(&p->filename_trans, 3614 filename_write_helper_compat, fp); 3615 } else { 3616 buf[0] = cpu_to_le32(p->filename_trans.nel); 3617 rc = put_entry(buf, sizeof(u32), 1, fp); 3618 if (rc) 3619 return rc; 3620 3621 rc = hashtab_map(&p->filename_trans, filename_write_helper, fp); 3622 } 3623 return rc; 3624 } 3625 3626 /* 3627 * Write the configuration data in a policy database 3628 * structure to a policy database binary representation 3629 * file. 3630 */ 3631 int policydb_write(struct policydb *p, void *fp) 3632 { 3633 unsigned int num_syms; 3634 int rc; 3635 __le32 buf[4]; 3636 u32 config, i; 3637 size_t len; 3638 const struct policydb_compat_info *info; 3639 3640 /* 3641 * refuse to write policy older than compressed avtab 3642 * to simplify the writer. There are other tests dropped 3643 * since we assume this throughout the writer code. Be 3644 * careful if you ever try to remove this restriction 3645 */ 3646 if (p->policyvers < POLICYDB_VERSION_AVTAB) { 3647 pr_err("SELinux: refusing to write policy version %d." 3648 " Because it is less than version %d\n", p->policyvers, 3649 POLICYDB_VERSION_AVTAB); 3650 return -EINVAL; 3651 } 3652 3653 config = 0; 3654 if (p->mls_enabled) 3655 config |= POLICYDB_CONFIG_MLS; 3656 3657 if (p->reject_unknown) 3658 config |= REJECT_UNKNOWN; 3659 if (p->allow_unknown) 3660 config |= ALLOW_UNKNOWN; 3661 3662 /* Write the magic number and string identifiers. */ 3663 buf[0] = cpu_to_le32(POLICYDB_MAGIC); 3664 len = strlen(POLICYDB_STRING); 3665 buf[1] = cpu_to_le32(len); 3666 rc = put_entry(buf, sizeof(u32), 2, fp); 3667 if (rc) 3668 return rc; 3669 rc = put_entry(POLICYDB_STRING, 1, len, fp); 3670 if (rc) 3671 return rc; 3672 3673 /* Write the version, config, and table sizes. */ 3674 info = policydb_lookup_compat(p->policyvers); 3675 if (!info) { 3676 pr_err("SELinux: compatibility lookup failed for policy " 3677 "version %d\n", p->policyvers); 3678 return -EINVAL; 3679 } 3680 3681 buf[0] = cpu_to_le32(p->policyvers); 3682 buf[1] = cpu_to_le32(config); 3683 buf[2] = cpu_to_le32(info->sym_num); 3684 buf[3] = cpu_to_le32(info->ocon_num); 3685 3686 rc = put_entry(buf, sizeof(u32), 4, fp); 3687 if (rc) 3688 return rc; 3689 3690 if (p->policyvers >= POLICYDB_VERSION_POLCAP) { 3691 rc = ebitmap_write(&p->policycaps, fp); 3692 if (rc) 3693 return rc; 3694 } 3695 3696 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) { 3697 rc = ebitmap_write(&p->permissive_map, fp); 3698 if (rc) 3699 return rc; 3700 } 3701 3702 num_syms = info->sym_num; 3703 for (i = 0; i < num_syms; i++) { 3704 struct policy_data pd; 3705 3706 pd.fp = fp; 3707 pd.p = p; 3708 3709 buf[0] = cpu_to_le32(p->symtab[i].nprim); 3710 buf[1] = cpu_to_le32(p->symtab[i].table.nel); 3711 3712 rc = put_entry(buf, sizeof(u32), 2, fp); 3713 if (rc) 3714 return rc; 3715 rc = hashtab_map(&p->symtab[i].table, write_f[i], &pd); 3716 if (rc) 3717 return rc; 3718 } 3719 3720 rc = avtab_write(p, &p->te_avtab, fp); 3721 if (rc) 3722 return rc; 3723 3724 rc = cond_write_list(p, fp); 3725 if (rc) 3726 return rc; 3727 3728 rc = role_trans_write(p, fp); 3729 if (rc) 3730 return rc; 3731 3732 rc = role_allow_write(p->role_allow, fp); 3733 if (rc) 3734 return rc; 3735 3736 rc = filename_trans_write(p, fp); 3737 if (rc) 3738 return rc; 3739 3740 rc = ocontext_write(p, info, fp); 3741 if (rc) 3742 return rc; 3743 3744 rc = genfs_write(p, fp); 3745 if (rc) 3746 return rc; 3747 3748 rc = range_write(p, fp); 3749 if (rc) 3750 return rc; 3751 3752 for (i = 0; i < p->p_types.nprim; i++) { 3753 struct ebitmap *e = &p->type_attr_map_array[i]; 3754 3755 rc = ebitmap_write(e, fp); 3756 if (rc) 3757 return rc; 3758 } 3759 3760 return 0; 3761 } 3762