1 /* 2 * Implementation of the policy database. 3 * 4 * Author : Stephen Smalley, <sds@tycho.nsa.gov> 5 */ 6 7 /* 8 * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com> 9 * 10 * Support for enhanced MLS infrastructure. 11 * 12 * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com> 13 * 14 * Added conditional policy language extensions 15 * 16 * Updated: Hewlett-Packard <paul@paul-moore.com> 17 * 18 * Added support for the policy capability bitmap 19 * 20 * Update: Mellanox Techonologies 21 * 22 * Added Infiniband support 23 * 24 * Copyright (C) 2016 Mellanox Techonologies 25 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P. 26 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc. 27 * Copyright (C) 2003 - 2004 Tresys Technology, LLC 28 * This program is free software; you can redistribute it and/or modify 29 * it under the terms of the GNU General Public License as published by 30 * the Free Software Foundation, version 2. 31 */ 32 33 #include <linux/kernel.h> 34 #include <linux/sched.h> 35 #include <linux/slab.h> 36 #include <linux/string.h> 37 #include <linux/errno.h> 38 #include <linux/audit.h> 39 #include <linux/flex_array.h> 40 #include "security.h" 41 42 #include "policydb.h" 43 #include "conditional.h" 44 #include "mls.h" 45 #include "services.h" 46 47 #define _DEBUG_HASHES 48 49 #ifdef DEBUG_HASHES 50 static const char *symtab_name[SYM_NUM] = { 51 "common prefixes", 52 "classes", 53 "roles", 54 "types", 55 "users", 56 "bools", 57 "levels", 58 "categories", 59 }; 60 #endif 61 62 static unsigned int symtab_sizes[SYM_NUM] = { 63 2, 64 32, 65 16, 66 512, 67 128, 68 16, 69 16, 70 16, 71 }; 72 73 struct policydb_compat_info { 74 int version; 75 int sym_num; 76 int ocon_num; 77 }; 78 79 /* These need to be updated if SYM_NUM or OCON_NUM changes */ 80 static struct policydb_compat_info policydb_compat[] = { 81 { 82 .version = POLICYDB_VERSION_BASE, 83 .sym_num = SYM_NUM - 3, 84 .ocon_num = OCON_NUM - 3, 85 }, 86 { 87 .version = POLICYDB_VERSION_BOOL, 88 .sym_num = SYM_NUM - 2, 89 .ocon_num = OCON_NUM - 3, 90 }, 91 { 92 .version = POLICYDB_VERSION_IPV6, 93 .sym_num = SYM_NUM - 2, 94 .ocon_num = OCON_NUM - 2, 95 }, 96 { 97 .version = POLICYDB_VERSION_NLCLASS, 98 .sym_num = SYM_NUM - 2, 99 .ocon_num = OCON_NUM - 2, 100 }, 101 { 102 .version = POLICYDB_VERSION_MLS, 103 .sym_num = SYM_NUM, 104 .ocon_num = OCON_NUM - 2, 105 }, 106 { 107 .version = POLICYDB_VERSION_AVTAB, 108 .sym_num = SYM_NUM, 109 .ocon_num = OCON_NUM - 2, 110 }, 111 { 112 .version = POLICYDB_VERSION_RANGETRANS, 113 .sym_num = SYM_NUM, 114 .ocon_num = OCON_NUM - 2, 115 }, 116 { 117 .version = POLICYDB_VERSION_POLCAP, 118 .sym_num = SYM_NUM, 119 .ocon_num = OCON_NUM - 2, 120 }, 121 { 122 .version = POLICYDB_VERSION_PERMISSIVE, 123 .sym_num = SYM_NUM, 124 .ocon_num = OCON_NUM - 2, 125 }, 126 { 127 .version = POLICYDB_VERSION_BOUNDARY, 128 .sym_num = SYM_NUM, 129 .ocon_num = OCON_NUM - 2, 130 }, 131 { 132 .version = POLICYDB_VERSION_FILENAME_TRANS, 133 .sym_num = SYM_NUM, 134 .ocon_num = OCON_NUM - 2, 135 }, 136 { 137 .version = POLICYDB_VERSION_ROLETRANS, 138 .sym_num = SYM_NUM, 139 .ocon_num = OCON_NUM - 2, 140 }, 141 { 142 .version = POLICYDB_VERSION_NEW_OBJECT_DEFAULTS, 143 .sym_num = SYM_NUM, 144 .ocon_num = OCON_NUM - 2, 145 }, 146 { 147 .version = POLICYDB_VERSION_DEFAULT_TYPE, 148 .sym_num = SYM_NUM, 149 .ocon_num = OCON_NUM - 2, 150 }, 151 { 152 .version = POLICYDB_VERSION_CONSTRAINT_NAMES, 153 .sym_num = SYM_NUM, 154 .ocon_num = OCON_NUM - 2, 155 }, 156 { 157 .version = POLICYDB_VERSION_XPERMS_IOCTL, 158 .sym_num = SYM_NUM, 159 .ocon_num = OCON_NUM - 2, 160 }, 161 { 162 .version = POLICYDB_VERSION_INFINIBAND, 163 .sym_num = SYM_NUM, 164 .ocon_num = OCON_NUM, 165 }, 166 }; 167 168 static struct policydb_compat_info *policydb_lookup_compat(int version) 169 { 170 int i; 171 struct policydb_compat_info *info = NULL; 172 173 for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) { 174 if (policydb_compat[i].version == version) { 175 info = &policydb_compat[i]; 176 break; 177 } 178 } 179 return info; 180 } 181 182 /* 183 * Initialize the role table. 184 */ 185 static int roles_init(struct policydb *p) 186 { 187 char *key = NULL; 188 int rc; 189 struct role_datum *role; 190 191 role = kzalloc(sizeof(*role), GFP_KERNEL); 192 if (!role) 193 return -ENOMEM; 194 195 rc = -EINVAL; 196 role->value = ++p->p_roles.nprim; 197 if (role->value != OBJECT_R_VAL) 198 goto out; 199 200 rc = -ENOMEM; 201 key = kstrdup(OBJECT_R, GFP_KERNEL); 202 if (!key) 203 goto out; 204 205 rc = hashtab_insert(p->p_roles.table, key, role); 206 if (rc) 207 goto out; 208 209 return 0; 210 out: 211 kfree(key); 212 kfree(role); 213 return rc; 214 } 215 216 static u32 filenametr_hash(struct hashtab *h, const void *k) 217 { 218 const struct filename_trans *ft = k; 219 unsigned long hash; 220 unsigned int byte_num; 221 unsigned char focus; 222 223 hash = ft->stype ^ ft->ttype ^ ft->tclass; 224 225 byte_num = 0; 226 while ((focus = ft->name[byte_num++])) 227 hash = partial_name_hash(focus, hash); 228 return hash & (h->size - 1); 229 } 230 231 static int filenametr_cmp(struct hashtab *h, const void *k1, const void *k2) 232 { 233 const struct filename_trans *ft1 = k1; 234 const struct filename_trans *ft2 = k2; 235 int v; 236 237 v = ft1->stype - ft2->stype; 238 if (v) 239 return v; 240 241 v = ft1->ttype - ft2->ttype; 242 if (v) 243 return v; 244 245 v = ft1->tclass - ft2->tclass; 246 if (v) 247 return v; 248 249 return strcmp(ft1->name, ft2->name); 250 251 } 252 253 static u32 rangetr_hash(struct hashtab *h, const void *k) 254 { 255 const struct range_trans *key = k; 256 return (key->source_type + (key->target_type << 3) + 257 (key->target_class << 5)) & (h->size - 1); 258 } 259 260 static int rangetr_cmp(struct hashtab *h, const void *k1, const void *k2) 261 { 262 const struct range_trans *key1 = k1, *key2 = k2; 263 int v; 264 265 v = key1->source_type - key2->source_type; 266 if (v) 267 return v; 268 269 v = key1->target_type - key2->target_type; 270 if (v) 271 return v; 272 273 v = key1->target_class - key2->target_class; 274 275 return v; 276 } 277 278 /* 279 * Initialize a policy database structure. 280 */ 281 static int policydb_init(struct policydb *p) 282 { 283 int i, rc; 284 285 memset(p, 0, sizeof(*p)); 286 287 for (i = 0; i < SYM_NUM; i++) { 288 rc = symtab_init(&p->symtab[i], symtab_sizes[i]); 289 if (rc) 290 goto out; 291 } 292 293 rc = avtab_init(&p->te_avtab); 294 if (rc) 295 goto out; 296 297 rc = roles_init(p); 298 if (rc) 299 goto out; 300 301 rc = cond_policydb_init(p); 302 if (rc) 303 goto out; 304 305 p->filename_trans = hashtab_create(filenametr_hash, filenametr_cmp, (1 << 10)); 306 if (!p->filename_trans) { 307 rc = -ENOMEM; 308 goto out; 309 } 310 311 p->range_tr = hashtab_create(rangetr_hash, rangetr_cmp, 256); 312 if (!p->range_tr) { 313 rc = -ENOMEM; 314 goto out; 315 } 316 317 ebitmap_init(&p->filename_trans_ttypes); 318 ebitmap_init(&p->policycaps); 319 ebitmap_init(&p->permissive_map); 320 321 return 0; 322 out: 323 hashtab_destroy(p->filename_trans); 324 hashtab_destroy(p->range_tr); 325 for (i = 0; i < SYM_NUM; i++) 326 hashtab_destroy(p->symtab[i].table); 327 return rc; 328 } 329 330 /* 331 * The following *_index functions are used to 332 * define the val_to_name and val_to_struct arrays 333 * in a policy database structure. The val_to_name 334 * arrays are used when converting security context 335 * structures into string representations. The 336 * val_to_struct arrays are used when the attributes 337 * of a class, role, or user are needed. 338 */ 339 340 static int common_index(void *key, void *datum, void *datap) 341 { 342 struct policydb *p; 343 struct common_datum *comdatum; 344 struct flex_array *fa; 345 346 comdatum = datum; 347 p = datap; 348 if (!comdatum->value || comdatum->value > p->p_commons.nprim) 349 return -EINVAL; 350 351 fa = p->sym_val_to_name[SYM_COMMONS]; 352 if (flex_array_put_ptr(fa, comdatum->value - 1, key, 353 GFP_KERNEL | __GFP_ZERO)) 354 BUG(); 355 return 0; 356 } 357 358 static int class_index(void *key, void *datum, void *datap) 359 { 360 struct policydb *p; 361 struct class_datum *cladatum; 362 struct flex_array *fa; 363 364 cladatum = datum; 365 p = datap; 366 if (!cladatum->value || cladatum->value > p->p_classes.nprim) 367 return -EINVAL; 368 fa = p->sym_val_to_name[SYM_CLASSES]; 369 if (flex_array_put_ptr(fa, cladatum->value - 1, key, 370 GFP_KERNEL | __GFP_ZERO)) 371 BUG(); 372 p->class_val_to_struct[cladatum->value - 1] = cladatum; 373 return 0; 374 } 375 376 static int role_index(void *key, void *datum, void *datap) 377 { 378 struct policydb *p; 379 struct role_datum *role; 380 struct flex_array *fa; 381 382 role = datum; 383 p = datap; 384 if (!role->value 385 || role->value > p->p_roles.nprim 386 || role->bounds > p->p_roles.nprim) 387 return -EINVAL; 388 389 fa = p->sym_val_to_name[SYM_ROLES]; 390 if (flex_array_put_ptr(fa, role->value - 1, key, 391 GFP_KERNEL | __GFP_ZERO)) 392 BUG(); 393 p->role_val_to_struct[role->value - 1] = role; 394 return 0; 395 } 396 397 static int type_index(void *key, void *datum, void *datap) 398 { 399 struct policydb *p; 400 struct type_datum *typdatum; 401 struct flex_array *fa; 402 403 typdatum = datum; 404 p = datap; 405 406 if (typdatum->primary) { 407 if (!typdatum->value 408 || typdatum->value > p->p_types.nprim 409 || typdatum->bounds > p->p_types.nprim) 410 return -EINVAL; 411 fa = p->sym_val_to_name[SYM_TYPES]; 412 if (flex_array_put_ptr(fa, typdatum->value - 1, key, 413 GFP_KERNEL | __GFP_ZERO)) 414 BUG(); 415 416 fa = p->type_val_to_struct_array; 417 if (flex_array_put_ptr(fa, typdatum->value - 1, typdatum, 418 GFP_KERNEL | __GFP_ZERO)) 419 BUG(); 420 } 421 422 return 0; 423 } 424 425 static int user_index(void *key, void *datum, void *datap) 426 { 427 struct policydb *p; 428 struct user_datum *usrdatum; 429 struct flex_array *fa; 430 431 usrdatum = datum; 432 p = datap; 433 if (!usrdatum->value 434 || usrdatum->value > p->p_users.nprim 435 || usrdatum->bounds > p->p_users.nprim) 436 return -EINVAL; 437 438 fa = p->sym_val_to_name[SYM_USERS]; 439 if (flex_array_put_ptr(fa, usrdatum->value - 1, key, 440 GFP_KERNEL | __GFP_ZERO)) 441 BUG(); 442 p->user_val_to_struct[usrdatum->value - 1] = usrdatum; 443 return 0; 444 } 445 446 static int sens_index(void *key, void *datum, void *datap) 447 { 448 struct policydb *p; 449 struct level_datum *levdatum; 450 struct flex_array *fa; 451 452 levdatum = datum; 453 p = datap; 454 455 if (!levdatum->isalias) { 456 if (!levdatum->level->sens || 457 levdatum->level->sens > p->p_levels.nprim) 458 return -EINVAL; 459 fa = p->sym_val_to_name[SYM_LEVELS]; 460 if (flex_array_put_ptr(fa, levdatum->level->sens - 1, key, 461 GFP_KERNEL | __GFP_ZERO)) 462 BUG(); 463 } 464 465 return 0; 466 } 467 468 static int cat_index(void *key, void *datum, void *datap) 469 { 470 struct policydb *p; 471 struct cat_datum *catdatum; 472 struct flex_array *fa; 473 474 catdatum = datum; 475 p = datap; 476 477 if (!catdatum->isalias) { 478 if (!catdatum->value || catdatum->value > p->p_cats.nprim) 479 return -EINVAL; 480 fa = p->sym_val_to_name[SYM_CATS]; 481 if (flex_array_put_ptr(fa, catdatum->value - 1, key, 482 GFP_KERNEL | __GFP_ZERO)) 483 BUG(); 484 } 485 486 return 0; 487 } 488 489 static int (*index_f[SYM_NUM]) (void *key, void *datum, void *datap) = 490 { 491 common_index, 492 class_index, 493 role_index, 494 type_index, 495 user_index, 496 cond_index_bool, 497 sens_index, 498 cat_index, 499 }; 500 501 #ifdef DEBUG_HASHES 502 static void hash_eval(struct hashtab *h, const char *hash_name) 503 { 504 struct hashtab_info info; 505 506 hashtab_stat(h, &info); 507 pr_debug("SELinux: %s: %d entries and %d/%d buckets used, " 508 "longest chain length %d\n", hash_name, h->nel, 509 info.slots_used, h->size, info.max_chain_len); 510 } 511 512 static void symtab_hash_eval(struct symtab *s) 513 { 514 int i; 515 516 for (i = 0; i < SYM_NUM; i++) 517 hash_eval(s[i].table, symtab_name[i]); 518 } 519 520 #else 521 static inline void hash_eval(struct hashtab *h, char *hash_name) 522 { 523 } 524 #endif 525 526 /* 527 * Define the other val_to_name and val_to_struct arrays 528 * in a policy database structure. 529 * 530 * Caller must clean up on failure. 531 */ 532 static int policydb_index(struct policydb *p) 533 { 534 int i, rc; 535 536 if (p->mls_enabled) 537 pr_debug("SELinux: %d users, %d roles, %d types, %d bools, %d sens, %d cats\n", 538 p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim, 539 p->p_bools.nprim, p->p_levels.nprim, p->p_cats.nprim); 540 else 541 pr_debug("SELinux: %d users, %d roles, %d types, %d bools\n", 542 p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim, 543 p->p_bools.nprim); 544 545 pr_debug("SELinux: %d classes, %d rules\n", 546 p->p_classes.nprim, p->te_avtab.nel); 547 548 #ifdef DEBUG_HASHES 549 avtab_hash_eval(&p->te_avtab, "rules"); 550 symtab_hash_eval(p->symtab); 551 #endif 552 553 p->class_val_to_struct = kcalloc(p->p_classes.nprim, 554 sizeof(*p->class_val_to_struct), 555 GFP_KERNEL); 556 if (!p->class_val_to_struct) 557 return -ENOMEM; 558 559 p->role_val_to_struct = kcalloc(p->p_roles.nprim, 560 sizeof(*p->role_val_to_struct), 561 GFP_KERNEL); 562 if (!p->role_val_to_struct) 563 return -ENOMEM; 564 565 p->user_val_to_struct = kcalloc(p->p_users.nprim, 566 sizeof(*p->user_val_to_struct), 567 GFP_KERNEL); 568 if (!p->user_val_to_struct) 569 return -ENOMEM; 570 571 /* Yes, I want the sizeof the pointer, not the structure */ 572 p->type_val_to_struct_array = flex_array_alloc(sizeof(struct type_datum *), 573 p->p_types.nprim, 574 GFP_KERNEL | __GFP_ZERO); 575 if (!p->type_val_to_struct_array) 576 return -ENOMEM; 577 578 rc = flex_array_prealloc(p->type_val_to_struct_array, 0, 579 p->p_types.nprim, GFP_KERNEL | __GFP_ZERO); 580 if (rc) 581 goto out; 582 583 rc = cond_init_bool_indexes(p); 584 if (rc) 585 goto out; 586 587 for (i = 0; i < SYM_NUM; i++) { 588 p->sym_val_to_name[i] = flex_array_alloc(sizeof(char *), 589 p->symtab[i].nprim, 590 GFP_KERNEL | __GFP_ZERO); 591 if (!p->sym_val_to_name[i]) 592 return -ENOMEM; 593 594 rc = flex_array_prealloc(p->sym_val_to_name[i], 595 0, p->symtab[i].nprim, 596 GFP_KERNEL | __GFP_ZERO); 597 if (rc) 598 goto out; 599 600 rc = hashtab_map(p->symtab[i].table, index_f[i], p); 601 if (rc) 602 goto out; 603 } 604 rc = 0; 605 out: 606 return rc; 607 } 608 609 /* 610 * The following *_destroy functions are used to 611 * free any memory allocated for each kind of 612 * symbol data in the policy database. 613 */ 614 615 static int perm_destroy(void *key, void *datum, void *p) 616 { 617 kfree(key); 618 kfree(datum); 619 return 0; 620 } 621 622 static int common_destroy(void *key, void *datum, void *p) 623 { 624 struct common_datum *comdatum; 625 626 kfree(key); 627 if (datum) { 628 comdatum = datum; 629 hashtab_map(comdatum->permissions.table, perm_destroy, NULL); 630 hashtab_destroy(comdatum->permissions.table); 631 } 632 kfree(datum); 633 return 0; 634 } 635 636 static void constraint_expr_destroy(struct constraint_expr *expr) 637 { 638 if (expr) { 639 ebitmap_destroy(&expr->names); 640 if (expr->type_names) { 641 ebitmap_destroy(&expr->type_names->types); 642 ebitmap_destroy(&expr->type_names->negset); 643 kfree(expr->type_names); 644 } 645 kfree(expr); 646 } 647 } 648 649 static int cls_destroy(void *key, void *datum, void *p) 650 { 651 struct class_datum *cladatum; 652 struct constraint_node *constraint, *ctemp; 653 struct constraint_expr *e, *etmp; 654 655 kfree(key); 656 if (datum) { 657 cladatum = datum; 658 hashtab_map(cladatum->permissions.table, perm_destroy, NULL); 659 hashtab_destroy(cladatum->permissions.table); 660 constraint = cladatum->constraints; 661 while (constraint) { 662 e = constraint->expr; 663 while (e) { 664 etmp = e; 665 e = e->next; 666 constraint_expr_destroy(etmp); 667 } 668 ctemp = constraint; 669 constraint = constraint->next; 670 kfree(ctemp); 671 } 672 673 constraint = cladatum->validatetrans; 674 while (constraint) { 675 e = constraint->expr; 676 while (e) { 677 etmp = e; 678 e = e->next; 679 constraint_expr_destroy(etmp); 680 } 681 ctemp = constraint; 682 constraint = constraint->next; 683 kfree(ctemp); 684 } 685 kfree(cladatum->comkey); 686 } 687 kfree(datum); 688 return 0; 689 } 690 691 static int role_destroy(void *key, void *datum, void *p) 692 { 693 struct role_datum *role; 694 695 kfree(key); 696 if (datum) { 697 role = datum; 698 ebitmap_destroy(&role->dominates); 699 ebitmap_destroy(&role->types); 700 } 701 kfree(datum); 702 return 0; 703 } 704 705 static int type_destroy(void *key, void *datum, void *p) 706 { 707 kfree(key); 708 kfree(datum); 709 return 0; 710 } 711 712 static int user_destroy(void *key, void *datum, void *p) 713 { 714 struct user_datum *usrdatum; 715 716 kfree(key); 717 if (datum) { 718 usrdatum = datum; 719 ebitmap_destroy(&usrdatum->roles); 720 ebitmap_destroy(&usrdatum->range.level[0].cat); 721 ebitmap_destroy(&usrdatum->range.level[1].cat); 722 ebitmap_destroy(&usrdatum->dfltlevel.cat); 723 } 724 kfree(datum); 725 return 0; 726 } 727 728 static int sens_destroy(void *key, void *datum, void *p) 729 { 730 struct level_datum *levdatum; 731 732 kfree(key); 733 if (datum) { 734 levdatum = datum; 735 if (levdatum->level) 736 ebitmap_destroy(&levdatum->level->cat); 737 kfree(levdatum->level); 738 } 739 kfree(datum); 740 return 0; 741 } 742 743 static int cat_destroy(void *key, void *datum, void *p) 744 { 745 kfree(key); 746 kfree(datum); 747 return 0; 748 } 749 750 static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) = 751 { 752 common_destroy, 753 cls_destroy, 754 role_destroy, 755 type_destroy, 756 user_destroy, 757 cond_destroy_bool, 758 sens_destroy, 759 cat_destroy, 760 }; 761 762 static int filenametr_destroy(void *key, void *datum, void *p) 763 { 764 struct filename_trans *ft = key; 765 kfree(ft->name); 766 kfree(key); 767 kfree(datum); 768 cond_resched(); 769 return 0; 770 } 771 772 static int range_tr_destroy(void *key, void *datum, void *p) 773 { 774 struct mls_range *rt = datum; 775 kfree(key); 776 ebitmap_destroy(&rt->level[0].cat); 777 ebitmap_destroy(&rt->level[1].cat); 778 kfree(datum); 779 cond_resched(); 780 return 0; 781 } 782 783 static void ocontext_destroy(struct ocontext *c, int i) 784 { 785 if (!c) 786 return; 787 788 context_destroy(&c->context[0]); 789 context_destroy(&c->context[1]); 790 if (i == OCON_ISID || i == OCON_FS || 791 i == OCON_NETIF || i == OCON_FSUSE) 792 kfree(c->u.name); 793 kfree(c); 794 } 795 796 /* 797 * Free any memory allocated by a policy database structure. 798 */ 799 void policydb_destroy(struct policydb *p) 800 { 801 struct ocontext *c, *ctmp; 802 struct genfs *g, *gtmp; 803 int i; 804 struct role_allow *ra, *lra = NULL; 805 struct role_trans *tr, *ltr = NULL; 806 807 for (i = 0; i < SYM_NUM; i++) { 808 cond_resched(); 809 hashtab_map(p->symtab[i].table, destroy_f[i], NULL); 810 hashtab_destroy(p->symtab[i].table); 811 } 812 813 for (i = 0; i < SYM_NUM; i++) { 814 if (p->sym_val_to_name[i]) 815 flex_array_free(p->sym_val_to_name[i]); 816 } 817 818 kfree(p->class_val_to_struct); 819 kfree(p->role_val_to_struct); 820 kfree(p->user_val_to_struct); 821 if (p->type_val_to_struct_array) 822 flex_array_free(p->type_val_to_struct_array); 823 824 avtab_destroy(&p->te_avtab); 825 826 for (i = 0; i < OCON_NUM; i++) { 827 cond_resched(); 828 c = p->ocontexts[i]; 829 while (c) { 830 ctmp = c; 831 c = c->next; 832 ocontext_destroy(ctmp, i); 833 } 834 p->ocontexts[i] = NULL; 835 } 836 837 g = p->genfs; 838 while (g) { 839 cond_resched(); 840 kfree(g->fstype); 841 c = g->head; 842 while (c) { 843 ctmp = c; 844 c = c->next; 845 ocontext_destroy(ctmp, OCON_FSUSE); 846 } 847 gtmp = g; 848 g = g->next; 849 kfree(gtmp); 850 } 851 p->genfs = NULL; 852 853 cond_policydb_destroy(p); 854 855 for (tr = p->role_tr; tr; tr = tr->next) { 856 cond_resched(); 857 kfree(ltr); 858 ltr = tr; 859 } 860 kfree(ltr); 861 862 for (ra = p->role_allow; ra; ra = ra->next) { 863 cond_resched(); 864 kfree(lra); 865 lra = ra; 866 } 867 kfree(lra); 868 869 hashtab_map(p->filename_trans, filenametr_destroy, NULL); 870 hashtab_destroy(p->filename_trans); 871 872 hashtab_map(p->range_tr, range_tr_destroy, NULL); 873 hashtab_destroy(p->range_tr); 874 875 if (p->type_attr_map_array) { 876 for (i = 0; i < p->p_types.nprim; i++) { 877 struct ebitmap *e; 878 879 e = flex_array_get(p->type_attr_map_array, i); 880 if (!e) 881 continue; 882 ebitmap_destroy(e); 883 } 884 flex_array_free(p->type_attr_map_array); 885 } 886 887 ebitmap_destroy(&p->filename_trans_ttypes); 888 ebitmap_destroy(&p->policycaps); 889 ebitmap_destroy(&p->permissive_map); 890 } 891 892 /* 893 * Load the initial SIDs specified in a policy database 894 * structure into a SID table. 895 */ 896 int policydb_load_isids(struct policydb *p, struct sidtab *s) 897 { 898 struct ocontext *head, *c; 899 int rc; 900 901 rc = sidtab_init(s); 902 if (rc) { 903 pr_err("SELinux: out of memory on SID table init\n"); 904 goto out; 905 } 906 907 head = p->ocontexts[OCON_ISID]; 908 for (c = head; c; c = c->next) { 909 rc = -EINVAL; 910 if (!c->context[0].user) { 911 pr_err("SELinux: SID %s was never defined.\n", 912 c->u.name); 913 sidtab_destroy(s); 914 goto out; 915 } 916 if (c->sid[0] == SECSID_NULL || c->sid[0] > SECINITSID_NUM) { 917 pr_err("SELinux: Initial SID %s out of range.\n", 918 c->u.name); 919 sidtab_destroy(s); 920 goto out; 921 } 922 923 rc = sidtab_set_initial(s, c->sid[0], &c->context[0]); 924 if (rc) { 925 pr_err("SELinux: unable to load initial SID %s.\n", 926 c->u.name); 927 sidtab_destroy(s); 928 goto out; 929 } 930 } 931 rc = 0; 932 out: 933 return rc; 934 } 935 936 int policydb_class_isvalid(struct policydb *p, unsigned int class) 937 { 938 if (!class || class > p->p_classes.nprim) 939 return 0; 940 return 1; 941 } 942 943 int policydb_role_isvalid(struct policydb *p, unsigned int role) 944 { 945 if (!role || role > p->p_roles.nprim) 946 return 0; 947 return 1; 948 } 949 950 int policydb_type_isvalid(struct policydb *p, unsigned int type) 951 { 952 if (!type || type > p->p_types.nprim) 953 return 0; 954 return 1; 955 } 956 957 /* 958 * Return 1 if the fields in the security context 959 * structure `c' are valid. Return 0 otherwise. 960 */ 961 int policydb_context_isvalid(struct policydb *p, struct context *c) 962 { 963 struct role_datum *role; 964 struct user_datum *usrdatum; 965 966 if (!c->role || c->role > p->p_roles.nprim) 967 return 0; 968 969 if (!c->user || c->user > p->p_users.nprim) 970 return 0; 971 972 if (!c->type || c->type > p->p_types.nprim) 973 return 0; 974 975 if (c->role != OBJECT_R_VAL) { 976 /* 977 * Role must be authorized for the type. 978 */ 979 role = p->role_val_to_struct[c->role - 1]; 980 if (!role || !ebitmap_get_bit(&role->types, c->type - 1)) 981 /* role may not be associated with type */ 982 return 0; 983 984 /* 985 * User must be authorized for the role. 986 */ 987 usrdatum = p->user_val_to_struct[c->user - 1]; 988 if (!usrdatum) 989 return 0; 990 991 if (!ebitmap_get_bit(&usrdatum->roles, c->role - 1)) 992 /* user may not be associated with role */ 993 return 0; 994 } 995 996 if (!mls_context_isvalid(p, c)) 997 return 0; 998 999 return 1; 1000 } 1001 1002 /* 1003 * Read a MLS range structure from a policydb binary 1004 * representation file. 1005 */ 1006 static int mls_read_range_helper(struct mls_range *r, void *fp) 1007 { 1008 __le32 buf[2]; 1009 u32 items; 1010 int rc; 1011 1012 rc = next_entry(buf, fp, sizeof(u32)); 1013 if (rc) 1014 goto out; 1015 1016 rc = -EINVAL; 1017 items = le32_to_cpu(buf[0]); 1018 if (items > ARRAY_SIZE(buf)) { 1019 pr_err("SELinux: mls: range overflow\n"); 1020 goto out; 1021 } 1022 1023 rc = next_entry(buf, fp, sizeof(u32) * items); 1024 if (rc) { 1025 pr_err("SELinux: mls: truncated range\n"); 1026 goto out; 1027 } 1028 1029 r->level[0].sens = le32_to_cpu(buf[0]); 1030 if (items > 1) 1031 r->level[1].sens = le32_to_cpu(buf[1]); 1032 else 1033 r->level[1].sens = r->level[0].sens; 1034 1035 rc = ebitmap_read(&r->level[0].cat, fp); 1036 if (rc) { 1037 pr_err("SELinux: mls: error reading low categories\n"); 1038 goto out; 1039 } 1040 if (items > 1) { 1041 rc = ebitmap_read(&r->level[1].cat, fp); 1042 if (rc) { 1043 pr_err("SELinux: mls: error reading high categories\n"); 1044 goto bad_high; 1045 } 1046 } else { 1047 rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat); 1048 if (rc) { 1049 pr_err("SELinux: mls: out of memory\n"); 1050 goto bad_high; 1051 } 1052 } 1053 1054 return 0; 1055 bad_high: 1056 ebitmap_destroy(&r->level[0].cat); 1057 out: 1058 return rc; 1059 } 1060 1061 /* 1062 * Read and validate a security context structure 1063 * from a policydb binary representation file. 1064 */ 1065 static int context_read_and_validate(struct context *c, 1066 struct policydb *p, 1067 void *fp) 1068 { 1069 __le32 buf[3]; 1070 int rc; 1071 1072 rc = next_entry(buf, fp, sizeof buf); 1073 if (rc) { 1074 pr_err("SELinux: context truncated\n"); 1075 goto out; 1076 } 1077 c->user = le32_to_cpu(buf[0]); 1078 c->role = le32_to_cpu(buf[1]); 1079 c->type = le32_to_cpu(buf[2]); 1080 if (p->policyvers >= POLICYDB_VERSION_MLS) { 1081 rc = mls_read_range_helper(&c->range, fp); 1082 if (rc) { 1083 pr_err("SELinux: error reading MLS range of context\n"); 1084 goto out; 1085 } 1086 } 1087 1088 rc = -EINVAL; 1089 if (!policydb_context_isvalid(p, c)) { 1090 pr_err("SELinux: invalid security context\n"); 1091 context_destroy(c); 1092 goto out; 1093 } 1094 rc = 0; 1095 out: 1096 return rc; 1097 } 1098 1099 /* 1100 * The following *_read functions are used to 1101 * read the symbol data from a policy database 1102 * binary representation file. 1103 */ 1104 1105 static int str_read(char **strp, gfp_t flags, void *fp, u32 len) 1106 { 1107 int rc; 1108 char *str; 1109 1110 if ((len == 0) || (len == (u32)-1)) 1111 return -EINVAL; 1112 1113 str = kmalloc(len + 1, flags | __GFP_NOWARN); 1114 if (!str) 1115 return -ENOMEM; 1116 1117 /* it's expected the caller should free the str */ 1118 *strp = str; 1119 1120 rc = next_entry(str, fp, len); 1121 if (rc) 1122 return rc; 1123 1124 str[len] = '\0'; 1125 return 0; 1126 } 1127 1128 static int perm_read(struct policydb *p, struct hashtab *h, void *fp) 1129 { 1130 char *key = NULL; 1131 struct perm_datum *perdatum; 1132 int rc; 1133 __le32 buf[2]; 1134 u32 len; 1135 1136 perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL); 1137 if (!perdatum) 1138 return -ENOMEM; 1139 1140 rc = next_entry(buf, fp, sizeof buf); 1141 if (rc) 1142 goto bad; 1143 1144 len = le32_to_cpu(buf[0]); 1145 perdatum->value = le32_to_cpu(buf[1]); 1146 1147 rc = str_read(&key, GFP_KERNEL, fp, len); 1148 if (rc) 1149 goto bad; 1150 1151 rc = hashtab_insert(h, key, perdatum); 1152 if (rc) 1153 goto bad; 1154 1155 return 0; 1156 bad: 1157 perm_destroy(key, perdatum, NULL); 1158 return rc; 1159 } 1160 1161 static int common_read(struct policydb *p, struct hashtab *h, void *fp) 1162 { 1163 char *key = NULL; 1164 struct common_datum *comdatum; 1165 __le32 buf[4]; 1166 u32 len, nel; 1167 int i, rc; 1168 1169 comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL); 1170 if (!comdatum) 1171 return -ENOMEM; 1172 1173 rc = next_entry(buf, fp, sizeof buf); 1174 if (rc) 1175 goto bad; 1176 1177 len = le32_to_cpu(buf[0]); 1178 comdatum->value = le32_to_cpu(buf[1]); 1179 1180 rc = symtab_init(&comdatum->permissions, PERM_SYMTAB_SIZE); 1181 if (rc) 1182 goto bad; 1183 comdatum->permissions.nprim = le32_to_cpu(buf[2]); 1184 nel = le32_to_cpu(buf[3]); 1185 1186 rc = str_read(&key, GFP_KERNEL, fp, len); 1187 if (rc) 1188 goto bad; 1189 1190 for (i = 0; i < nel; i++) { 1191 rc = perm_read(p, comdatum->permissions.table, fp); 1192 if (rc) 1193 goto bad; 1194 } 1195 1196 rc = hashtab_insert(h, key, comdatum); 1197 if (rc) 1198 goto bad; 1199 return 0; 1200 bad: 1201 common_destroy(key, comdatum, NULL); 1202 return rc; 1203 } 1204 1205 static void type_set_init(struct type_set *t) 1206 { 1207 ebitmap_init(&t->types); 1208 ebitmap_init(&t->negset); 1209 } 1210 1211 static int type_set_read(struct type_set *t, void *fp) 1212 { 1213 __le32 buf[1]; 1214 int rc; 1215 1216 if (ebitmap_read(&t->types, fp)) 1217 return -EINVAL; 1218 if (ebitmap_read(&t->negset, fp)) 1219 return -EINVAL; 1220 1221 rc = next_entry(buf, fp, sizeof(u32)); 1222 if (rc < 0) 1223 return -EINVAL; 1224 t->flags = le32_to_cpu(buf[0]); 1225 1226 return 0; 1227 } 1228 1229 1230 static int read_cons_helper(struct policydb *p, 1231 struct constraint_node **nodep, 1232 int ncons, int allowxtarget, void *fp) 1233 { 1234 struct constraint_node *c, *lc; 1235 struct constraint_expr *e, *le; 1236 __le32 buf[3]; 1237 u32 nexpr; 1238 int rc, i, j, depth; 1239 1240 lc = NULL; 1241 for (i = 0; i < ncons; i++) { 1242 c = kzalloc(sizeof(*c), GFP_KERNEL); 1243 if (!c) 1244 return -ENOMEM; 1245 1246 if (lc) 1247 lc->next = c; 1248 else 1249 *nodep = c; 1250 1251 rc = next_entry(buf, fp, (sizeof(u32) * 2)); 1252 if (rc) 1253 return rc; 1254 c->permissions = le32_to_cpu(buf[0]); 1255 nexpr = le32_to_cpu(buf[1]); 1256 le = NULL; 1257 depth = -1; 1258 for (j = 0; j < nexpr; j++) { 1259 e = kzalloc(sizeof(*e), GFP_KERNEL); 1260 if (!e) 1261 return -ENOMEM; 1262 1263 if (le) 1264 le->next = e; 1265 else 1266 c->expr = e; 1267 1268 rc = next_entry(buf, fp, (sizeof(u32) * 3)); 1269 if (rc) 1270 return rc; 1271 e->expr_type = le32_to_cpu(buf[0]); 1272 e->attr = le32_to_cpu(buf[1]); 1273 e->op = le32_to_cpu(buf[2]); 1274 1275 switch (e->expr_type) { 1276 case CEXPR_NOT: 1277 if (depth < 0) 1278 return -EINVAL; 1279 break; 1280 case CEXPR_AND: 1281 case CEXPR_OR: 1282 if (depth < 1) 1283 return -EINVAL; 1284 depth--; 1285 break; 1286 case CEXPR_ATTR: 1287 if (depth == (CEXPR_MAXDEPTH - 1)) 1288 return -EINVAL; 1289 depth++; 1290 break; 1291 case CEXPR_NAMES: 1292 if (!allowxtarget && (e->attr & CEXPR_XTARGET)) 1293 return -EINVAL; 1294 if (depth == (CEXPR_MAXDEPTH - 1)) 1295 return -EINVAL; 1296 depth++; 1297 rc = ebitmap_read(&e->names, fp); 1298 if (rc) 1299 return rc; 1300 if (p->policyvers >= 1301 POLICYDB_VERSION_CONSTRAINT_NAMES) { 1302 e->type_names = kzalloc(sizeof 1303 (*e->type_names), 1304 GFP_KERNEL); 1305 if (!e->type_names) 1306 return -ENOMEM; 1307 type_set_init(e->type_names); 1308 rc = type_set_read(e->type_names, fp); 1309 if (rc) 1310 return rc; 1311 } 1312 break; 1313 default: 1314 return -EINVAL; 1315 } 1316 le = e; 1317 } 1318 if (depth != 0) 1319 return -EINVAL; 1320 lc = c; 1321 } 1322 1323 return 0; 1324 } 1325 1326 static int class_read(struct policydb *p, struct hashtab *h, void *fp) 1327 { 1328 char *key = NULL; 1329 struct class_datum *cladatum; 1330 __le32 buf[6]; 1331 u32 len, len2, ncons, nel; 1332 int i, rc; 1333 1334 cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL); 1335 if (!cladatum) 1336 return -ENOMEM; 1337 1338 rc = next_entry(buf, fp, sizeof(u32)*6); 1339 if (rc) 1340 goto bad; 1341 1342 len = le32_to_cpu(buf[0]); 1343 len2 = le32_to_cpu(buf[1]); 1344 cladatum->value = le32_to_cpu(buf[2]); 1345 1346 rc = symtab_init(&cladatum->permissions, PERM_SYMTAB_SIZE); 1347 if (rc) 1348 goto bad; 1349 cladatum->permissions.nprim = le32_to_cpu(buf[3]); 1350 nel = le32_to_cpu(buf[4]); 1351 1352 ncons = le32_to_cpu(buf[5]); 1353 1354 rc = str_read(&key, GFP_KERNEL, fp, len); 1355 if (rc) 1356 goto bad; 1357 1358 if (len2) { 1359 rc = str_read(&cladatum->comkey, GFP_KERNEL, fp, len2); 1360 if (rc) 1361 goto bad; 1362 1363 rc = -EINVAL; 1364 cladatum->comdatum = hashtab_search(p->p_commons.table, cladatum->comkey); 1365 if (!cladatum->comdatum) { 1366 pr_err("SELinux: unknown common %s\n", 1367 cladatum->comkey); 1368 goto bad; 1369 } 1370 } 1371 for (i = 0; i < nel; i++) { 1372 rc = perm_read(p, cladatum->permissions.table, fp); 1373 if (rc) 1374 goto bad; 1375 } 1376 1377 rc = read_cons_helper(p, &cladatum->constraints, ncons, 0, fp); 1378 if (rc) 1379 goto bad; 1380 1381 if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) { 1382 /* grab the validatetrans rules */ 1383 rc = next_entry(buf, fp, sizeof(u32)); 1384 if (rc) 1385 goto bad; 1386 ncons = le32_to_cpu(buf[0]); 1387 rc = read_cons_helper(p, &cladatum->validatetrans, 1388 ncons, 1, fp); 1389 if (rc) 1390 goto bad; 1391 } 1392 1393 if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) { 1394 rc = next_entry(buf, fp, sizeof(u32) * 3); 1395 if (rc) 1396 goto bad; 1397 1398 cladatum->default_user = le32_to_cpu(buf[0]); 1399 cladatum->default_role = le32_to_cpu(buf[1]); 1400 cladatum->default_range = le32_to_cpu(buf[2]); 1401 } 1402 1403 if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) { 1404 rc = next_entry(buf, fp, sizeof(u32) * 1); 1405 if (rc) 1406 goto bad; 1407 cladatum->default_type = le32_to_cpu(buf[0]); 1408 } 1409 1410 rc = hashtab_insert(h, key, cladatum); 1411 if (rc) 1412 goto bad; 1413 1414 return 0; 1415 bad: 1416 cls_destroy(key, cladatum, NULL); 1417 return rc; 1418 } 1419 1420 static int role_read(struct policydb *p, struct hashtab *h, void *fp) 1421 { 1422 char *key = NULL; 1423 struct role_datum *role; 1424 int rc, to_read = 2; 1425 __le32 buf[3]; 1426 u32 len; 1427 1428 role = kzalloc(sizeof(*role), GFP_KERNEL); 1429 if (!role) 1430 return -ENOMEM; 1431 1432 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) 1433 to_read = 3; 1434 1435 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read); 1436 if (rc) 1437 goto bad; 1438 1439 len = le32_to_cpu(buf[0]); 1440 role->value = le32_to_cpu(buf[1]); 1441 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) 1442 role->bounds = le32_to_cpu(buf[2]); 1443 1444 rc = str_read(&key, GFP_KERNEL, fp, len); 1445 if (rc) 1446 goto bad; 1447 1448 rc = ebitmap_read(&role->dominates, fp); 1449 if (rc) 1450 goto bad; 1451 1452 rc = ebitmap_read(&role->types, fp); 1453 if (rc) 1454 goto bad; 1455 1456 if (strcmp(key, OBJECT_R) == 0) { 1457 rc = -EINVAL; 1458 if (role->value != OBJECT_R_VAL) { 1459 pr_err("SELinux: Role %s has wrong value %d\n", 1460 OBJECT_R, role->value); 1461 goto bad; 1462 } 1463 rc = 0; 1464 goto bad; 1465 } 1466 1467 rc = hashtab_insert(h, key, role); 1468 if (rc) 1469 goto bad; 1470 return 0; 1471 bad: 1472 role_destroy(key, role, NULL); 1473 return rc; 1474 } 1475 1476 static int type_read(struct policydb *p, struct hashtab *h, void *fp) 1477 { 1478 char *key = NULL; 1479 struct type_datum *typdatum; 1480 int rc, to_read = 3; 1481 __le32 buf[4]; 1482 u32 len; 1483 1484 typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL); 1485 if (!typdatum) 1486 return -ENOMEM; 1487 1488 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) 1489 to_read = 4; 1490 1491 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read); 1492 if (rc) 1493 goto bad; 1494 1495 len = le32_to_cpu(buf[0]); 1496 typdatum->value = le32_to_cpu(buf[1]); 1497 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) { 1498 u32 prop = le32_to_cpu(buf[2]); 1499 1500 if (prop & TYPEDATUM_PROPERTY_PRIMARY) 1501 typdatum->primary = 1; 1502 if (prop & TYPEDATUM_PROPERTY_ATTRIBUTE) 1503 typdatum->attribute = 1; 1504 1505 typdatum->bounds = le32_to_cpu(buf[3]); 1506 } else { 1507 typdatum->primary = le32_to_cpu(buf[2]); 1508 } 1509 1510 rc = str_read(&key, GFP_KERNEL, fp, len); 1511 if (rc) 1512 goto bad; 1513 1514 rc = hashtab_insert(h, key, typdatum); 1515 if (rc) 1516 goto bad; 1517 return 0; 1518 bad: 1519 type_destroy(key, typdatum, NULL); 1520 return rc; 1521 } 1522 1523 1524 /* 1525 * Read a MLS level structure from a policydb binary 1526 * representation file. 1527 */ 1528 static int mls_read_level(struct mls_level *lp, void *fp) 1529 { 1530 __le32 buf[1]; 1531 int rc; 1532 1533 memset(lp, 0, sizeof(*lp)); 1534 1535 rc = next_entry(buf, fp, sizeof buf); 1536 if (rc) { 1537 pr_err("SELinux: mls: truncated level\n"); 1538 return rc; 1539 } 1540 lp->sens = le32_to_cpu(buf[0]); 1541 1542 rc = ebitmap_read(&lp->cat, fp); 1543 if (rc) { 1544 pr_err("SELinux: mls: error reading level categories\n"); 1545 return rc; 1546 } 1547 return 0; 1548 } 1549 1550 static int user_read(struct policydb *p, struct hashtab *h, void *fp) 1551 { 1552 char *key = NULL; 1553 struct user_datum *usrdatum; 1554 int rc, to_read = 2; 1555 __le32 buf[3]; 1556 u32 len; 1557 1558 usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL); 1559 if (!usrdatum) 1560 return -ENOMEM; 1561 1562 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) 1563 to_read = 3; 1564 1565 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read); 1566 if (rc) 1567 goto bad; 1568 1569 len = le32_to_cpu(buf[0]); 1570 usrdatum->value = le32_to_cpu(buf[1]); 1571 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) 1572 usrdatum->bounds = le32_to_cpu(buf[2]); 1573 1574 rc = str_read(&key, GFP_KERNEL, fp, len); 1575 if (rc) 1576 goto bad; 1577 1578 rc = ebitmap_read(&usrdatum->roles, fp); 1579 if (rc) 1580 goto bad; 1581 1582 if (p->policyvers >= POLICYDB_VERSION_MLS) { 1583 rc = mls_read_range_helper(&usrdatum->range, fp); 1584 if (rc) 1585 goto bad; 1586 rc = mls_read_level(&usrdatum->dfltlevel, fp); 1587 if (rc) 1588 goto bad; 1589 } 1590 1591 rc = hashtab_insert(h, key, usrdatum); 1592 if (rc) 1593 goto bad; 1594 return 0; 1595 bad: 1596 user_destroy(key, usrdatum, NULL); 1597 return rc; 1598 } 1599 1600 static int sens_read(struct policydb *p, struct hashtab *h, void *fp) 1601 { 1602 char *key = NULL; 1603 struct level_datum *levdatum; 1604 int rc; 1605 __le32 buf[2]; 1606 u32 len; 1607 1608 levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC); 1609 if (!levdatum) 1610 return -ENOMEM; 1611 1612 rc = next_entry(buf, fp, sizeof buf); 1613 if (rc) 1614 goto bad; 1615 1616 len = le32_to_cpu(buf[0]); 1617 levdatum->isalias = le32_to_cpu(buf[1]); 1618 1619 rc = str_read(&key, GFP_ATOMIC, fp, len); 1620 if (rc) 1621 goto bad; 1622 1623 rc = -ENOMEM; 1624 levdatum->level = kmalloc(sizeof(*levdatum->level), GFP_ATOMIC); 1625 if (!levdatum->level) 1626 goto bad; 1627 1628 rc = mls_read_level(levdatum->level, fp); 1629 if (rc) 1630 goto bad; 1631 1632 rc = hashtab_insert(h, key, levdatum); 1633 if (rc) 1634 goto bad; 1635 return 0; 1636 bad: 1637 sens_destroy(key, levdatum, NULL); 1638 return rc; 1639 } 1640 1641 static int cat_read(struct policydb *p, struct hashtab *h, void *fp) 1642 { 1643 char *key = NULL; 1644 struct cat_datum *catdatum; 1645 int rc; 1646 __le32 buf[3]; 1647 u32 len; 1648 1649 catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC); 1650 if (!catdatum) 1651 return -ENOMEM; 1652 1653 rc = next_entry(buf, fp, sizeof buf); 1654 if (rc) 1655 goto bad; 1656 1657 len = le32_to_cpu(buf[0]); 1658 catdatum->value = le32_to_cpu(buf[1]); 1659 catdatum->isalias = le32_to_cpu(buf[2]); 1660 1661 rc = str_read(&key, GFP_ATOMIC, fp, len); 1662 if (rc) 1663 goto bad; 1664 1665 rc = hashtab_insert(h, key, catdatum); 1666 if (rc) 1667 goto bad; 1668 return 0; 1669 bad: 1670 cat_destroy(key, catdatum, NULL); 1671 return rc; 1672 } 1673 1674 static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, void *fp) = 1675 { 1676 common_read, 1677 class_read, 1678 role_read, 1679 type_read, 1680 user_read, 1681 cond_read_bool, 1682 sens_read, 1683 cat_read, 1684 }; 1685 1686 static int user_bounds_sanity_check(void *key, void *datum, void *datap) 1687 { 1688 struct user_datum *upper, *user; 1689 struct policydb *p = datap; 1690 int depth = 0; 1691 1692 upper = user = 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: user %s: " 1699 "too deep or looped boundary", 1700 (char *) key); 1701 return -EINVAL; 1702 } 1703 1704 upper = p->user_val_to_struct[upper->bounds - 1]; 1705 ebitmap_for_each_positive_bit(&user->roles, node, bit) { 1706 if (ebitmap_get_bit(&upper->roles, bit)) 1707 continue; 1708 1709 pr_err("SELinux: boundary violated policy: " 1710 "user=%s role=%s bounds=%s\n", 1711 sym_name(p, SYM_USERS, user->value - 1), 1712 sym_name(p, SYM_ROLES, bit), 1713 sym_name(p, SYM_USERS, upper->value - 1)); 1714 1715 return -EINVAL; 1716 } 1717 } 1718 1719 return 0; 1720 } 1721 1722 static int role_bounds_sanity_check(void *key, void *datum, void *datap) 1723 { 1724 struct role_datum *upper, *role; 1725 struct policydb *p = datap; 1726 int depth = 0; 1727 1728 upper = role = datum; 1729 while (upper->bounds) { 1730 struct ebitmap_node *node; 1731 unsigned long bit; 1732 1733 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) { 1734 pr_err("SELinux: role %s: " 1735 "too deep or looped bounds\n", 1736 (char *) key); 1737 return -EINVAL; 1738 } 1739 1740 upper = p->role_val_to_struct[upper->bounds - 1]; 1741 ebitmap_for_each_positive_bit(&role->types, node, bit) { 1742 if (ebitmap_get_bit(&upper->types, bit)) 1743 continue; 1744 1745 pr_err("SELinux: boundary violated policy: " 1746 "role=%s type=%s bounds=%s\n", 1747 sym_name(p, SYM_ROLES, role->value - 1), 1748 sym_name(p, SYM_TYPES, bit), 1749 sym_name(p, SYM_ROLES, upper->value - 1)); 1750 1751 return -EINVAL; 1752 } 1753 } 1754 1755 return 0; 1756 } 1757 1758 static int type_bounds_sanity_check(void *key, void *datum, void *datap) 1759 { 1760 struct type_datum *upper; 1761 struct policydb *p = datap; 1762 int depth = 0; 1763 1764 upper = datum; 1765 while (upper->bounds) { 1766 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) { 1767 pr_err("SELinux: type %s: " 1768 "too deep or looped boundary\n", 1769 (char *) key); 1770 return -EINVAL; 1771 } 1772 1773 upper = flex_array_get_ptr(p->type_val_to_struct_array, 1774 upper->bounds - 1); 1775 BUG_ON(!upper); 1776 1777 if (upper->attribute) { 1778 pr_err("SELinux: type %s: " 1779 "bounded by attribute %s", 1780 (char *) key, 1781 sym_name(p, SYM_TYPES, upper->value - 1)); 1782 return -EINVAL; 1783 } 1784 } 1785 1786 return 0; 1787 } 1788 1789 static int policydb_bounds_sanity_check(struct policydb *p) 1790 { 1791 int rc; 1792 1793 if (p->policyvers < POLICYDB_VERSION_BOUNDARY) 1794 return 0; 1795 1796 rc = hashtab_map(p->p_users.table, 1797 user_bounds_sanity_check, p); 1798 if (rc) 1799 return rc; 1800 1801 rc = hashtab_map(p->p_roles.table, 1802 role_bounds_sanity_check, p); 1803 if (rc) 1804 return rc; 1805 1806 rc = hashtab_map(p->p_types.table, 1807 type_bounds_sanity_check, p); 1808 if (rc) 1809 return rc; 1810 1811 return 0; 1812 } 1813 1814 u16 string_to_security_class(struct policydb *p, const char *name) 1815 { 1816 struct class_datum *cladatum; 1817 1818 cladatum = hashtab_search(p->p_classes.table, name); 1819 if (!cladatum) 1820 return 0; 1821 1822 return cladatum->value; 1823 } 1824 1825 u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name) 1826 { 1827 struct class_datum *cladatum; 1828 struct perm_datum *perdatum = NULL; 1829 struct common_datum *comdatum; 1830 1831 if (!tclass || tclass > p->p_classes.nprim) 1832 return 0; 1833 1834 cladatum = p->class_val_to_struct[tclass-1]; 1835 comdatum = cladatum->comdatum; 1836 if (comdatum) 1837 perdatum = hashtab_search(comdatum->permissions.table, 1838 name); 1839 if (!perdatum) 1840 perdatum = hashtab_search(cladatum->permissions.table, 1841 name); 1842 if (!perdatum) 1843 return 0; 1844 1845 return 1U << (perdatum->value-1); 1846 } 1847 1848 static int range_read(struct policydb *p, void *fp) 1849 { 1850 struct range_trans *rt = NULL; 1851 struct mls_range *r = NULL; 1852 int i, rc; 1853 __le32 buf[2]; 1854 u32 nel; 1855 1856 if (p->policyvers < POLICYDB_VERSION_MLS) 1857 return 0; 1858 1859 rc = next_entry(buf, fp, sizeof(u32)); 1860 if (rc) 1861 return rc; 1862 1863 nel = le32_to_cpu(buf[0]); 1864 for (i = 0; i < nel; i++) { 1865 rc = -ENOMEM; 1866 rt = kzalloc(sizeof(*rt), GFP_KERNEL); 1867 if (!rt) 1868 goto out; 1869 1870 rc = next_entry(buf, fp, (sizeof(u32) * 2)); 1871 if (rc) 1872 goto out; 1873 1874 rt->source_type = le32_to_cpu(buf[0]); 1875 rt->target_type = le32_to_cpu(buf[1]); 1876 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) { 1877 rc = next_entry(buf, fp, sizeof(u32)); 1878 if (rc) 1879 goto out; 1880 rt->target_class = le32_to_cpu(buf[0]); 1881 } else 1882 rt->target_class = p->process_class; 1883 1884 rc = -EINVAL; 1885 if (!policydb_type_isvalid(p, rt->source_type) || 1886 !policydb_type_isvalid(p, rt->target_type) || 1887 !policydb_class_isvalid(p, rt->target_class)) 1888 goto out; 1889 1890 rc = -ENOMEM; 1891 r = kzalloc(sizeof(*r), GFP_KERNEL); 1892 if (!r) 1893 goto out; 1894 1895 rc = mls_read_range_helper(r, fp); 1896 if (rc) 1897 goto out; 1898 1899 rc = -EINVAL; 1900 if (!mls_range_isvalid(p, r)) { 1901 pr_warn("SELinux: rangetrans: invalid range\n"); 1902 goto out; 1903 } 1904 1905 rc = hashtab_insert(p->range_tr, rt, r); 1906 if (rc) 1907 goto out; 1908 1909 rt = NULL; 1910 r = NULL; 1911 } 1912 hash_eval(p->range_tr, "rangetr"); 1913 rc = 0; 1914 out: 1915 kfree(rt); 1916 kfree(r); 1917 return rc; 1918 } 1919 1920 static int filename_trans_read(struct policydb *p, void *fp) 1921 { 1922 struct filename_trans *ft; 1923 struct filename_trans_datum *otype; 1924 char *name; 1925 u32 nel, len; 1926 __le32 buf[4]; 1927 int rc, i; 1928 1929 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS) 1930 return 0; 1931 1932 rc = next_entry(buf, fp, sizeof(u32)); 1933 if (rc) 1934 return rc; 1935 nel = le32_to_cpu(buf[0]); 1936 1937 for (i = 0; i < nel; i++) { 1938 otype = NULL; 1939 name = NULL; 1940 1941 rc = -ENOMEM; 1942 ft = kzalloc(sizeof(*ft), GFP_KERNEL); 1943 if (!ft) 1944 goto out; 1945 1946 rc = -ENOMEM; 1947 otype = kmalloc(sizeof(*otype), GFP_KERNEL); 1948 if (!otype) 1949 goto out; 1950 1951 /* length of the path component string */ 1952 rc = next_entry(buf, fp, sizeof(u32)); 1953 if (rc) 1954 goto out; 1955 len = le32_to_cpu(buf[0]); 1956 1957 /* path component string */ 1958 rc = str_read(&name, GFP_KERNEL, fp, len); 1959 if (rc) 1960 goto out; 1961 1962 ft->name = name; 1963 1964 rc = next_entry(buf, fp, sizeof(u32) * 4); 1965 if (rc) 1966 goto out; 1967 1968 ft->stype = le32_to_cpu(buf[0]); 1969 ft->ttype = le32_to_cpu(buf[1]); 1970 ft->tclass = le32_to_cpu(buf[2]); 1971 1972 otype->otype = le32_to_cpu(buf[3]); 1973 1974 rc = ebitmap_set_bit(&p->filename_trans_ttypes, ft->ttype, 1); 1975 if (rc) 1976 goto out; 1977 1978 rc = hashtab_insert(p->filename_trans, ft, otype); 1979 if (rc) { 1980 /* 1981 * Do not return -EEXIST to the caller, or the system 1982 * will not boot. 1983 */ 1984 if (rc != -EEXIST) 1985 goto out; 1986 /* But free memory to avoid memory leak. */ 1987 kfree(ft); 1988 kfree(name); 1989 kfree(otype); 1990 } 1991 } 1992 hash_eval(p->filename_trans, "filenametr"); 1993 return 0; 1994 out: 1995 kfree(ft); 1996 kfree(name); 1997 kfree(otype); 1998 1999 return rc; 2000 } 2001 2002 static int genfs_read(struct policydb *p, void *fp) 2003 { 2004 int i, j, rc; 2005 u32 nel, nel2, len, len2; 2006 __le32 buf[1]; 2007 struct ocontext *l, *c; 2008 struct ocontext *newc = NULL; 2009 struct genfs *genfs_p, *genfs; 2010 struct genfs *newgenfs = NULL; 2011 2012 rc = next_entry(buf, fp, sizeof(u32)); 2013 if (rc) 2014 return rc; 2015 nel = le32_to_cpu(buf[0]); 2016 2017 for (i = 0; i < nel; i++) { 2018 rc = next_entry(buf, fp, sizeof(u32)); 2019 if (rc) 2020 goto out; 2021 len = le32_to_cpu(buf[0]); 2022 2023 rc = -ENOMEM; 2024 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL); 2025 if (!newgenfs) 2026 goto out; 2027 2028 rc = str_read(&newgenfs->fstype, GFP_KERNEL, fp, len); 2029 if (rc) 2030 goto out; 2031 2032 for (genfs_p = NULL, genfs = p->genfs; genfs; 2033 genfs_p = genfs, genfs = genfs->next) { 2034 rc = -EINVAL; 2035 if (strcmp(newgenfs->fstype, genfs->fstype) == 0) { 2036 pr_err("SELinux: dup genfs fstype %s\n", 2037 newgenfs->fstype); 2038 goto out; 2039 } 2040 if (strcmp(newgenfs->fstype, genfs->fstype) < 0) 2041 break; 2042 } 2043 newgenfs->next = genfs; 2044 if (genfs_p) 2045 genfs_p->next = newgenfs; 2046 else 2047 p->genfs = newgenfs; 2048 genfs = newgenfs; 2049 newgenfs = NULL; 2050 2051 rc = next_entry(buf, fp, sizeof(u32)); 2052 if (rc) 2053 goto out; 2054 2055 nel2 = le32_to_cpu(buf[0]); 2056 for (j = 0; j < nel2; j++) { 2057 rc = next_entry(buf, fp, sizeof(u32)); 2058 if (rc) 2059 goto out; 2060 len = le32_to_cpu(buf[0]); 2061 2062 rc = -ENOMEM; 2063 newc = kzalloc(sizeof(*newc), GFP_KERNEL); 2064 if (!newc) 2065 goto out; 2066 2067 rc = str_read(&newc->u.name, GFP_KERNEL, fp, len); 2068 if (rc) 2069 goto out; 2070 2071 rc = next_entry(buf, fp, sizeof(u32)); 2072 if (rc) 2073 goto out; 2074 2075 newc->v.sclass = le32_to_cpu(buf[0]); 2076 rc = context_read_and_validate(&newc->context[0], p, fp); 2077 if (rc) 2078 goto out; 2079 2080 for (l = NULL, c = genfs->head; c; 2081 l = c, c = c->next) { 2082 rc = -EINVAL; 2083 if (!strcmp(newc->u.name, c->u.name) && 2084 (!c->v.sclass || !newc->v.sclass || 2085 newc->v.sclass == c->v.sclass)) { 2086 pr_err("SELinux: dup genfs entry (%s,%s)\n", 2087 genfs->fstype, c->u.name); 2088 goto out; 2089 } 2090 len = strlen(newc->u.name); 2091 len2 = strlen(c->u.name); 2092 if (len > len2) 2093 break; 2094 } 2095 2096 newc->next = c; 2097 if (l) 2098 l->next = newc; 2099 else 2100 genfs->head = newc; 2101 newc = NULL; 2102 } 2103 } 2104 rc = 0; 2105 out: 2106 if (newgenfs) { 2107 kfree(newgenfs->fstype); 2108 kfree(newgenfs); 2109 } 2110 ocontext_destroy(newc, OCON_FSUSE); 2111 2112 return rc; 2113 } 2114 2115 static int ocontext_read(struct policydb *p, struct policydb_compat_info *info, 2116 void *fp) 2117 { 2118 int i, j, rc; 2119 u32 nel, len; 2120 __be64 prefixbuf[1]; 2121 __le32 buf[3]; 2122 struct ocontext *l, *c; 2123 u32 nodebuf[8]; 2124 2125 for (i = 0; i < info->ocon_num; i++) { 2126 rc = next_entry(buf, fp, sizeof(u32)); 2127 if (rc) 2128 goto out; 2129 nel = le32_to_cpu(buf[0]); 2130 2131 l = NULL; 2132 for (j = 0; j < nel; j++) { 2133 rc = -ENOMEM; 2134 c = kzalloc(sizeof(*c), GFP_KERNEL); 2135 if (!c) 2136 goto out; 2137 if (l) 2138 l->next = c; 2139 else 2140 p->ocontexts[i] = c; 2141 l = c; 2142 2143 switch (i) { 2144 case OCON_ISID: 2145 rc = next_entry(buf, fp, sizeof(u32)); 2146 if (rc) 2147 goto out; 2148 2149 c->sid[0] = le32_to_cpu(buf[0]); 2150 rc = context_read_and_validate(&c->context[0], p, fp); 2151 if (rc) 2152 goto out; 2153 break; 2154 case OCON_FS: 2155 case OCON_NETIF: 2156 rc = next_entry(buf, fp, sizeof(u32)); 2157 if (rc) 2158 goto out; 2159 len = le32_to_cpu(buf[0]); 2160 2161 rc = str_read(&c->u.name, GFP_KERNEL, fp, len); 2162 if (rc) 2163 goto out; 2164 2165 rc = context_read_and_validate(&c->context[0], p, fp); 2166 if (rc) 2167 goto out; 2168 rc = context_read_and_validate(&c->context[1], p, fp); 2169 if (rc) 2170 goto out; 2171 break; 2172 case OCON_PORT: 2173 rc = next_entry(buf, fp, sizeof(u32)*3); 2174 if (rc) 2175 goto out; 2176 c->u.port.protocol = le32_to_cpu(buf[0]); 2177 c->u.port.low_port = le32_to_cpu(buf[1]); 2178 c->u.port.high_port = le32_to_cpu(buf[2]); 2179 rc = context_read_and_validate(&c->context[0], p, fp); 2180 if (rc) 2181 goto out; 2182 break; 2183 case OCON_NODE: 2184 rc = next_entry(nodebuf, fp, sizeof(u32) * 2); 2185 if (rc) 2186 goto out; 2187 c->u.node.addr = nodebuf[0]; /* network order */ 2188 c->u.node.mask = nodebuf[1]; /* network order */ 2189 rc = context_read_and_validate(&c->context[0], p, fp); 2190 if (rc) 2191 goto out; 2192 break; 2193 case OCON_FSUSE: 2194 rc = next_entry(buf, fp, sizeof(u32)*2); 2195 if (rc) 2196 goto out; 2197 2198 rc = -EINVAL; 2199 c->v.behavior = le32_to_cpu(buf[0]); 2200 /* Determined at runtime, not in policy DB. */ 2201 if (c->v.behavior == SECURITY_FS_USE_MNTPOINT) 2202 goto out; 2203 if (c->v.behavior > SECURITY_FS_USE_MAX) 2204 goto out; 2205 2206 len = le32_to_cpu(buf[1]); 2207 rc = str_read(&c->u.name, GFP_KERNEL, fp, len); 2208 if (rc) 2209 goto out; 2210 2211 rc = context_read_and_validate(&c->context[0], p, fp); 2212 if (rc) 2213 goto out; 2214 break; 2215 case OCON_NODE6: { 2216 int k; 2217 2218 rc = next_entry(nodebuf, fp, sizeof(u32) * 8); 2219 if (rc) 2220 goto out; 2221 for (k = 0; k < 4; k++) 2222 c->u.node6.addr[k] = nodebuf[k]; 2223 for (k = 0; k < 4; k++) 2224 c->u.node6.mask[k] = nodebuf[k+4]; 2225 rc = context_read_and_validate(&c->context[0], p, fp); 2226 if (rc) 2227 goto out; 2228 break; 2229 } 2230 case OCON_IBPKEY: { 2231 u32 pkey_lo, pkey_hi; 2232 2233 rc = next_entry(prefixbuf, fp, sizeof(u64)); 2234 if (rc) 2235 goto out; 2236 2237 /* we need to have subnet_prefix in CPU order */ 2238 c->u.ibpkey.subnet_prefix = be64_to_cpu(prefixbuf[0]); 2239 2240 rc = next_entry(buf, fp, sizeof(u32) * 2); 2241 if (rc) 2242 goto out; 2243 2244 pkey_lo = le32_to_cpu(buf[0]); 2245 pkey_hi = le32_to_cpu(buf[1]); 2246 2247 if (pkey_lo > U16_MAX || pkey_hi > U16_MAX) { 2248 rc = -EINVAL; 2249 goto out; 2250 } 2251 2252 c->u.ibpkey.low_pkey = pkey_lo; 2253 c->u.ibpkey.high_pkey = pkey_hi; 2254 2255 rc = context_read_and_validate(&c->context[0], 2256 p, 2257 fp); 2258 if (rc) 2259 goto out; 2260 break; 2261 } 2262 case OCON_IBENDPORT: { 2263 u32 port; 2264 2265 rc = next_entry(buf, fp, sizeof(u32) * 2); 2266 if (rc) 2267 goto out; 2268 len = le32_to_cpu(buf[0]); 2269 2270 rc = str_read(&c->u.ibendport.dev_name, GFP_KERNEL, fp, len); 2271 if (rc) 2272 goto out; 2273 2274 port = le32_to_cpu(buf[1]); 2275 if (port > U8_MAX || port == 0) { 2276 rc = -EINVAL; 2277 goto out; 2278 } 2279 2280 c->u.ibendport.port = port; 2281 2282 rc = context_read_and_validate(&c->context[0], 2283 p, 2284 fp); 2285 if (rc) 2286 goto out; 2287 break; 2288 } /* end case */ 2289 } /* end switch */ 2290 } 2291 } 2292 rc = 0; 2293 out: 2294 return rc; 2295 } 2296 2297 /* 2298 * Read the configuration data from a policy database binary 2299 * representation file into a policy database structure. 2300 */ 2301 int policydb_read(struct policydb *p, void *fp) 2302 { 2303 struct role_allow *ra, *lra; 2304 struct role_trans *tr, *ltr; 2305 int i, j, rc; 2306 __le32 buf[4]; 2307 u32 len, nprim, nel; 2308 2309 char *policydb_str; 2310 struct policydb_compat_info *info; 2311 2312 rc = policydb_init(p); 2313 if (rc) 2314 return rc; 2315 2316 /* Read the magic number and string length. */ 2317 rc = next_entry(buf, fp, sizeof(u32) * 2); 2318 if (rc) 2319 goto bad; 2320 2321 rc = -EINVAL; 2322 if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) { 2323 pr_err("SELinux: policydb magic number 0x%x does " 2324 "not match expected magic number 0x%x\n", 2325 le32_to_cpu(buf[0]), POLICYDB_MAGIC); 2326 goto bad; 2327 } 2328 2329 rc = -EINVAL; 2330 len = le32_to_cpu(buf[1]); 2331 if (len != strlen(POLICYDB_STRING)) { 2332 pr_err("SELinux: policydb string length %d does not " 2333 "match expected length %zu\n", 2334 len, strlen(POLICYDB_STRING)); 2335 goto bad; 2336 } 2337 2338 rc = -ENOMEM; 2339 policydb_str = kmalloc(len + 1, GFP_KERNEL); 2340 if (!policydb_str) { 2341 pr_err("SELinux: unable to allocate memory for policydb " 2342 "string of length %d\n", len); 2343 goto bad; 2344 } 2345 2346 rc = next_entry(policydb_str, fp, len); 2347 if (rc) { 2348 pr_err("SELinux: truncated policydb string identifier\n"); 2349 kfree(policydb_str); 2350 goto bad; 2351 } 2352 2353 rc = -EINVAL; 2354 policydb_str[len] = '\0'; 2355 if (strcmp(policydb_str, POLICYDB_STRING)) { 2356 pr_err("SELinux: policydb string %s does not match " 2357 "my string %s\n", policydb_str, POLICYDB_STRING); 2358 kfree(policydb_str); 2359 goto bad; 2360 } 2361 /* Done with policydb_str. */ 2362 kfree(policydb_str); 2363 policydb_str = NULL; 2364 2365 /* Read the version and table sizes. */ 2366 rc = next_entry(buf, fp, sizeof(u32)*4); 2367 if (rc) 2368 goto bad; 2369 2370 rc = -EINVAL; 2371 p->policyvers = le32_to_cpu(buf[0]); 2372 if (p->policyvers < POLICYDB_VERSION_MIN || 2373 p->policyvers > POLICYDB_VERSION_MAX) { 2374 pr_err("SELinux: policydb version %d does not match " 2375 "my version range %d-%d\n", 2376 le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX); 2377 goto bad; 2378 } 2379 2380 if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) { 2381 p->mls_enabled = 1; 2382 2383 rc = -EINVAL; 2384 if (p->policyvers < POLICYDB_VERSION_MLS) { 2385 pr_err("SELinux: security policydb version %d " 2386 "(MLS) not backwards compatible\n", 2387 p->policyvers); 2388 goto bad; 2389 } 2390 } 2391 p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN); 2392 p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN); 2393 2394 if (p->policyvers >= POLICYDB_VERSION_POLCAP) { 2395 rc = ebitmap_read(&p->policycaps, fp); 2396 if (rc) 2397 goto bad; 2398 } 2399 2400 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) { 2401 rc = ebitmap_read(&p->permissive_map, fp); 2402 if (rc) 2403 goto bad; 2404 } 2405 2406 rc = -EINVAL; 2407 info = policydb_lookup_compat(p->policyvers); 2408 if (!info) { 2409 pr_err("SELinux: unable to find policy compat info " 2410 "for version %d\n", p->policyvers); 2411 goto bad; 2412 } 2413 2414 rc = -EINVAL; 2415 if (le32_to_cpu(buf[2]) != info->sym_num || 2416 le32_to_cpu(buf[3]) != info->ocon_num) { 2417 pr_err("SELinux: policydb table sizes (%d,%d) do " 2418 "not match mine (%d,%d)\n", le32_to_cpu(buf[2]), 2419 le32_to_cpu(buf[3]), 2420 info->sym_num, info->ocon_num); 2421 goto bad; 2422 } 2423 2424 for (i = 0; i < info->sym_num; i++) { 2425 rc = next_entry(buf, fp, sizeof(u32)*2); 2426 if (rc) 2427 goto bad; 2428 nprim = le32_to_cpu(buf[0]); 2429 nel = le32_to_cpu(buf[1]); 2430 for (j = 0; j < nel; j++) { 2431 rc = read_f[i](p, p->symtab[i].table, fp); 2432 if (rc) 2433 goto bad; 2434 } 2435 2436 p->symtab[i].nprim = nprim; 2437 } 2438 2439 rc = -EINVAL; 2440 p->process_class = string_to_security_class(p, "process"); 2441 if (!p->process_class) 2442 goto bad; 2443 2444 rc = avtab_read(&p->te_avtab, fp, p); 2445 if (rc) 2446 goto bad; 2447 2448 if (p->policyvers >= POLICYDB_VERSION_BOOL) { 2449 rc = cond_read_list(p, fp); 2450 if (rc) 2451 goto bad; 2452 } 2453 2454 rc = next_entry(buf, fp, sizeof(u32)); 2455 if (rc) 2456 goto bad; 2457 nel = le32_to_cpu(buf[0]); 2458 ltr = NULL; 2459 for (i = 0; i < nel; i++) { 2460 rc = -ENOMEM; 2461 tr = kzalloc(sizeof(*tr), GFP_KERNEL); 2462 if (!tr) 2463 goto bad; 2464 if (ltr) 2465 ltr->next = tr; 2466 else 2467 p->role_tr = tr; 2468 rc = next_entry(buf, fp, sizeof(u32)*3); 2469 if (rc) 2470 goto bad; 2471 2472 rc = -EINVAL; 2473 tr->role = le32_to_cpu(buf[0]); 2474 tr->type = le32_to_cpu(buf[1]); 2475 tr->new_role = le32_to_cpu(buf[2]); 2476 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) { 2477 rc = next_entry(buf, fp, sizeof(u32)); 2478 if (rc) 2479 goto bad; 2480 tr->tclass = le32_to_cpu(buf[0]); 2481 } else 2482 tr->tclass = p->process_class; 2483 2484 rc = -EINVAL; 2485 if (!policydb_role_isvalid(p, tr->role) || 2486 !policydb_type_isvalid(p, tr->type) || 2487 !policydb_class_isvalid(p, tr->tclass) || 2488 !policydb_role_isvalid(p, tr->new_role)) 2489 goto bad; 2490 ltr = tr; 2491 } 2492 2493 rc = next_entry(buf, fp, sizeof(u32)); 2494 if (rc) 2495 goto bad; 2496 nel = le32_to_cpu(buf[0]); 2497 lra = NULL; 2498 for (i = 0; i < nel; i++) { 2499 rc = -ENOMEM; 2500 ra = kzalloc(sizeof(*ra), GFP_KERNEL); 2501 if (!ra) 2502 goto bad; 2503 if (lra) 2504 lra->next = ra; 2505 else 2506 p->role_allow = ra; 2507 rc = next_entry(buf, fp, sizeof(u32)*2); 2508 if (rc) 2509 goto bad; 2510 2511 rc = -EINVAL; 2512 ra->role = le32_to_cpu(buf[0]); 2513 ra->new_role = le32_to_cpu(buf[1]); 2514 if (!policydb_role_isvalid(p, ra->role) || 2515 !policydb_role_isvalid(p, ra->new_role)) 2516 goto bad; 2517 lra = ra; 2518 } 2519 2520 rc = filename_trans_read(p, fp); 2521 if (rc) 2522 goto bad; 2523 2524 rc = policydb_index(p); 2525 if (rc) 2526 goto bad; 2527 2528 rc = -EINVAL; 2529 p->process_trans_perms = string_to_av_perm(p, p->process_class, "transition"); 2530 p->process_trans_perms |= string_to_av_perm(p, p->process_class, "dyntransition"); 2531 if (!p->process_trans_perms) 2532 goto bad; 2533 2534 rc = ocontext_read(p, info, fp); 2535 if (rc) 2536 goto bad; 2537 2538 rc = genfs_read(p, fp); 2539 if (rc) 2540 goto bad; 2541 2542 rc = range_read(p, fp); 2543 if (rc) 2544 goto bad; 2545 2546 rc = -ENOMEM; 2547 p->type_attr_map_array = flex_array_alloc(sizeof(struct ebitmap), 2548 p->p_types.nprim, 2549 GFP_KERNEL | __GFP_ZERO); 2550 if (!p->type_attr_map_array) 2551 goto bad; 2552 2553 /* preallocate so we don't have to worry about the put ever failing */ 2554 rc = flex_array_prealloc(p->type_attr_map_array, 0, p->p_types.nprim, 2555 GFP_KERNEL | __GFP_ZERO); 2556 if (rc) 2557 goto bad; 2558 2559 for (i = 0; i < p->p_types.nprim; i++) { 2560 struct ebitmap *e = flex_array_get(p->type_attr_map_array, i); 2561 2562 BUG_ON(!e); 2563 ebitmap_init(e); 2564 if (p->policyvers >= POLICYDB_VERSION_AVTAB) { 2565 rc = ebitmap_read(e, fp); 2566 if (rc) 2567 goto bad; 2568 } 2569 /* add the type itself as the degenerate case */ 2570 rc = ebitmap_set_bit(e, i, 1); 2571 if (rc) 2572 goto bad; 2573 } 2574 2575 rc = policydb_bounds_sanity_check(p); 2576 if (rc) 2577 goto bad; 2578 2579 rc = 0; 2580 out: 2581 return rc; 2582 bad: 2583 policydb_destroy(p); 2584 goto out; 2585 } 2586 2587 /* 2588 * Write a MLS level structure to a policydb binary 2589 * representation file. 2590 */ 2591 static int mls_write_level(struct mls_level *l, void *fp) 2592 { 2593 __le32 buf[1]; 2594 int rc; 2595 2596 buf[0] = cpu_to_le32(l->sens); 2597 rc = put_entry(buf, sizeof(u32), 1, fp); 2598 if (rc) 2599 return rc; 2600 2601 rc = ebitmap_write(&l->cat, fp); 2602 if (rc) 2603 return rc; 2604 2605 return 0; 2606 } 2607 2608 /* 2609 * Write a MLS range structure to a policydb binary 2610 * representation file. 2611 */ 2612 static int mls_write_range_helper(struct mls_range *r, void *fp) 2613 { 2614 __le32 buf[3]; 2615 size_t items; 2616 int rc, eq; 2617 2618 eq = mls_level_eq(&r->level[1], &r->level[0]); 2619 2620 if (eq) 2621 items = 2; 2622 else 2623 items = 3; 2624 buf[0] = cpu_to_le32(items-1); 2625 buf[1] = cpu_to_le32(r->level[0].sens); 2626 if (!eq) 2627 buf[2] = cpu_to_le32(r->level[1].sens); 2628 2629 BUG_ON(items > ARRAY_SIZE(buf)); 2630 2631 rc = put_entry(buf, sizeof(u32), items, fp); 2632 if (rc) 2633 return rc; 2634 2635 rc = ebitmap_write(&r->level[0].cat, fp); 2636 if (rc) 2637 return rc; 2638 if (!eq) { 2639 rc = ebitmap_write(&r->level[1].cat, fp); 2640 if (rc) 2641 return rc; 2642 } 2643 2644 return 0; 2645 } 2646 2647 static int sens_write(void *vkey, void *datum, void *ptr) 2648 { 2649 char *key = vkey; 2650 struct level_datum *levdatum = datum; 2651 struct policy_data *pd = ptr; 2652 void *fp = pd->fp; 2653 __le32 buf[2]; 2654 size_t len; 2655 int rc; 2656 2657 len = strlen(key); 2658 buf[0] = cpu_to_le32(len); 2659 buf[1] = cpu_to_le32(levdatum->isalias); 2660 rc = put_entry(buf, sizeof(u32), 2, fp); 2661 if (rc) 2662 return rc; 2663 2664 rc = put_entry(key, 1, len, fp); 2665 if (rc) 2666 return rc; 2667 2668 rc = mls_write_level(levdatum->level, fp); 2669 if (rc) 2670 return rc; 2671 2672 return 0; 2673 } 2674 2675 static int cat_write(void *vkey, void *datum, void *ptr) 2676 { 2677 char *key = vkey; 2678 struct cat_datum *catdatum = datum; 2679 struct policy_data *pd = ptr; 2680 void *fp = pd->fp; 2681 __le32 buf[3]; 2682 size_t len; 2683 int rc; 2684 2685 len = strlen(key); 2686 buf[0] = cpu_to_le32(len); 2687 buf[1] = cpu_to_le32(catdatum->value); 2688 buf[2] = cpu_to_le32(catdatum->isalias); 2689 rc = put_entry(buf, sizeof(u32), 3, fp); 2690 if (rc) 2691 return rc; 2692 2693 rc = put_entry(key, 1, len, fp); 2694 if (rc) 2695 return rc; 2696 2697 return 0; 2698 } 2699 2700 static int role_trans_write(struct policydb *p, void *fp) 2701 { 2702 struct role_trans *r = p->role_tr; 2703 struct role_trans *tr; 2704 u32 buf[3]; 2705 size_t nel; 2706 int rc; 2707 2708 nel = 0; 2709 for (tr = r; tr; tr = tr->next) 2710 nel++; 2711 buf[0] = cpu_to_le32(nel); 2712 rc = put_entry(buf, sizeof(u32), 1, fp); 2713 if (rc) 2714 return rc; 2715 for (tr = r; tr; tr = tr->next) { 2716 buf[0] = cpu_to_le32(tr->role); 2717 buf[1] = cpu_to_le32(tr->type); 2718 buf[2] = cpu_to_le32(tr->new_role); 2719 rc = put_entry(buf, sizeof(u32), 3, fp); 2720 if (rc) 2721 return rc; 2722 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) { 2723 buf[0] = cpu_to_le32(tr->tclass); 2724 rc = put_entry(buf, sizeof(u32), 1, fp); 2725 if (rc) 2726 return rc; 2727 } 2728 } 2729 2730 return 0; 2731 } 2732 2733 static int role_allow_write(struct role_allow *r, void *fp) 2734 { 2735 struct role_allow *ra; 2736 u32 buf[2]; 2737 size_t nel; 2738 int rc; 2739 2740 nel = 0; 2741 for (ra = r; ra; ra = ra->next) 2742 nel++; 2743 buf[0] = cpu_to_le32(nel); 2744 rc = put_entry(buf, sizeof(u32), 1, fp); 2745 if (rc) 2746 return rc; 2747 for (ra = r; ra; ra = ra->next) { 2748 buf[0] = cpu_to_le32(ra->role); 2749 buf[1] = cpu_to_le32(ra->new_role); 2750 rc = put_entry(buf, sizeof(u32), 2, fp); 2751 if (rc) 2752 return rc; 2753 } 2754 return 0; 2755 } 2756 2757 /* 2758 * Write a security context structure 2759 * to a policydb binary representation file. 2760 */ 2761 static int context_write(struct policydb *p, struct context *c, 2762 void *fp) 2763 { 2764 int rc; 2765 __le32 buf[3]; 2766 2767 buf[0] = cpu_to_le32(c->user); 2768 buf[1] = cpu_to_le32(c->role); 2769 buf[2] = cpu_to_le32(c->type); 2770 2771 rc = put_entry(buf, sizeof(u32), 3, fp); 2772 if (rc) 2773 return rc; 2774 2775 rc = mls_write_range_helper(&c->range, fp); 2776 if (rc) 2777 return rc; 2778 2779 return 0; 2780 } 2781 2782 /* 2783 * The following *_write functions are used to 2784 * write the symbol data to a policy database 2785 * binary representation file. 2786 */ 2787 2788 static int perm_write(void *vkey, void *datum, void *fp) 2789 { 2790 char *key = vkey; 2791 struct perm_datum *perdatum = datum; 2792 __le32 buf[2]; 2793 size_t len; 2794 int rc; 2795 2796 len = strlen(key); 2797 buf[0] = cpu_to_le32(len); 2798 buf[1] = cpu_to_le32(perdatum->value); 2799 rc = put_entry(buf, sizeof(u32), 2, fp); 2800 if (rc) 2801 return rc; 2802 2803 rc = put_entry(key, 1, len, fp); 2804 if (rc) 2805 return rc; 2806 2807 return 0; 2808 } 2809 2810 static int common_write(void *vkey, void *datum, void *ptr) 2811 { 2812 char *key = vkey; 2813 struct common_datum *comdatum = datum; 2814 struct policy_data *pd = ptr; 2815 void *fp = pd->fp; 2816 __le32 buf[4]; 2817 size_t len; 2818 int rc; 2819 2820 len = strlen(key); 2821 buf[0] = cpu_to_le32(len); 2822 buf[1] = cpu_to_le32(comdatum->value); 2823 buf[2] = cpu_to_le32(comdatum->permissions.nprim); 2824 buf[3] = cpu_to_le32(comdatum->permissions.table->nel); 2825 rc = put_entry(buf, sizeof(u32), 4, fp); 2826 if (rc) 2827 return rc; 2828 2829 rc = put_entry(key, 1, len, fp); 2830 if (rc) 2831 return rc; 2832 2833 rc = hashtab_map(comdatum->permissions.table, perm_write, fp); 2834 if (rc) 2835 return rc; 2836 2837 return 0; 2838 } 2839 2840 static int type_set_write(struct type_set *t, void *fp) 2841 { 2842 int rc; 2843 __le32 buf[1]; 2844 2845 if (ebitmap_write(&t->types, fp)) 2846 return -EINVAL; 2847 if (ebitmap_write(&t->negset, fp)) 2848 return -EINVAL; 2849 2850 buf[0] = cpu_to_le32(t->flags); 2851 rc = put_entry(buf, sizeof(u32), 1, fp); 2852 if (rc) 2853 return -EINVAL; 2854 2855 return 0; 2856 } 2857 2858 static int write_cons_helper(struct policydb *p, struct constraint_node *node, 2859 void *fp) 2860 { 2861 struct constraint_node *c; 2862 struct constraint_expr *e; 2863 __le32 buf[3]; 2864 u32 nel; 2865 int rc; 2866 2867 for (c = node; c; c = c->next) { 2868 nel = 0; 2869 for (e = c->expr; e; e = e->next) 2870 nel++; 2871 buf[0] = cpu_to_le32(c->permissions); 2872 buf[1] = cpu_to_le32(nel); 2873 rc = put_entry(buf, sizeof(u32), 2, fp); 2874 if (rc) 2875 return rc; 2876 for (e = c->expr; e; e = e->next) { 2877 buf[0] = cpu_to_le32(e->expr_type); 2878 buf[1] = cpu_to_le32(e->attr); 2879 buf[2] = cpu_to_le32(e->op); 2880 rc = put_entry(buf, sizeof(u32), 3, fp); 2881 if (rc) 2882 return rc; 2883 2884 switch (e->expr_type) { 2885 case CEXPR_NAMES: 2886 rc = ebitmap_write(&e->names, fp); 2887 if (rc) 2888 return rc; 2889 if (p->policyvers >= 2890 POLICYDB_VERSION_CONSTRAINT_NAMES) { 2891 rc = type_set_write(e->type_names, fp); 2892 if (rc) 2893 return rc; 2894 } 2895 break; 2896 default: 2897 break; 2898 } 2899 } 2900 } 2901 2902 return 0; 2903 } 2904 2905 static int class_write(void *vkey, void *datum, void *ptr) 2906 { 2907 char *key = vkey; 2908 struct class_datum *cladatum = datum; 2909 struct policy_data *pd = ptr; 2910 void *fp = pd->fp; 2911 struct policydb *p = pd->p; 2912 struct constraint_node *c; 2913 __le32 buf[6]; 2914 u32 ncons; 2915 size_t len, len2; 2916 int rc; 2917 2918 len = strlen(key); 2919 if (cladatum->comkey) 2920 len2 = strlen(cladatum->comkey); 2921 else 2922 len2 = 0; 2923 2924 ncons = 0; 2925 for (c = cladatum->constraints; c; c = c->next) 2926 ncons++; 2927 2928 buf[0] = cpu_to_le32(len); 2929 buf[1] = cpu_to_le32(len2); 2930 buf[2] = cpu_to_le32(cladatum->value); 2931 buf[3] = cpu_to_le32(cladatum->permissions.nprim); 2932 if (cladatum->permissions.table) 2933 buf[4] = cpu_to_le32(cladatum->permissions.table->nel); 2934 else 2935 buf[4] = 0; 2936 buf[5] = cpu_to_le32(ncons); 2937 rc = put_entry(buf, sizeof(u32), 6, fp); 2938 if (rc) 2939 return rc; 2940 2941 rc = put_entry(key, 1, len, fp); 2942 if (rc) 2943 return rc; 2944 2945 if (cladatum->comkey) { 2946 rc = put_entry(cladatum->comkey, 1, len2, fp); 2947 if (rc) 2948 return rc; 2949 } 2950 2951 rc = hashtab_map(cladatum->permissions.table, perm_write, fp); 2952 if (rc) 2953 return rc; 2954 2955 rc = write_cons_helper(p, cladatum->constraints, fp); 2956 if (rc) 2957 return rc; 2958 2959 /* write out the validatetrans rule */ 2960 ncons = 0; 2961 for (c = cladatum->validatetrans; c; c = c->next) 2962 ncons++; 2963 2964 buf[0] = cpu_to_le32(ncons); 2965 rc = put_entry(buf, sizeof(u32), 1, fp); 2966 if (rc) 2967 return rc; 2968 2969 rc = write_cons_helper(p, cladatum->validatetrans, fp); 2970 if (rc) 2971 return rc; 2972 2973 if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) { 2974 buf[0] = cpu_to_le32(cladatum->default_user); 2975 buf[1] = cpu_to_le32(cladatum->default_role); 2976 buf[2] = cpu_to_le32(cladatum->default_range); 2977 2978 rc = put_entry(buf, sizeof(uint32_t), 3, fp); 2979 if (rc) 2980 return rc; 2981 } 2982 2983 if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) { 2984 buf[0] = cpu_to_le32(cladatum->default_type); 2985 rc = put_entry(buf, sizeof(uint32_t), 1, fp); 2986 if (rc) 2987 return rc; 2988 } 2989 2990 return 0; 2991 } 2992 2993 static int role_write(void *vkey, void *datum, void *ptr) 2994 { 2995 char *key = vkey; 2996 struct role_datum *role = datum; 2997 struct policy_data *pd = ptr; 2998 void *fp = pd->fp; 2999 struct policydb *p = pd->p; 3000 __le32 buf[3]; 3001 size_t items, len; 3002 int rc; 3003 3004 len = strlen(key); 3005 items = 0; 3006 buf[items++] = cpu_to_le32(len); 3007 buf[items++] = cpu_to_le32(role->value); 3008 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) 3009 buf[items++] = cpu_to_le32(role->bounds); 3010 3011 BUG_ON(items > ARRAY_SIZE(buf)); 3012 3013 rc = put_entry(buf, sizeof(u32), items, fp); 3014 if (rc) 3015 return rc; 3016 3017 rc = put_entry(key, 1, len, fp); 3018 if (rc) 3019 return rc; 3020 3021 rc = ebitmap_write(&role->dominates, fp); 3022 if (rc) 3023 return rc; 3024 3025 rc = ebitmap_write(&role->types, fp); 3026 if (rc) 3027 return rc; 3028 3029 return 0; 3030 } 3031 3032 static int type_write(void *vkey, void *datum, void *ptr) 3033 { 3034 char *key = vkey; 3035 struct type_datum *typdatum = datum; 3036 struct policy_data *pd = ptr; 3037 struct policydb *p = pd->p; 3038 void *fp = pd->fp; 3039 __le32 buf[4]; 3040 int rc; 3041 size_t items, len; 3042 3043 len = strlen(key); 3044 items = 0; 3045 buf[items++] = cpu_to_le32(len); 3046 buf[items++] = cpu_to_le32(typdatum->value); 3047 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) { 3048 u32 properties = 0; 3049 3050 if (typdatum->primary) 3051 properties |= TYPEDATUM_PROPERTY_PRIMARY; 3052 3053 if (typdatum->attribute) 3054 properties |= TYPEDATUM_PROPERTY_ATTRIBUTE; 3055 3056 buf[items++] = cpu_to_le32(properties); 3057 buf[items++] = cpu_to_le32(typdatum->bounds); 3058 } else { 3059 buf[items++] = cpu_to_le32(typdatum->primary); 3060 } 3061 BUG_ON(items > ARRAY_SIZE(buf)); 3062 rc = put_entry(buf, sizeof(u32), items, fp); 3063 if (rc) 3064 return rc; 3065 3066 rc = put_entry(key, 1, len, fp); 3067 if (rc) 3068 return rc; 3069 3070 return 0; 3071 } 3072 3073 static int user_write(void *vkey, void *datum, void *ptr) 3074 { 3075 char *key = vkey; 3076 struct user_datum *usrdatum = datum; 3077 struct policy_data *pd = ptr; 3078 struct policydb *p = pd->p; 3079 void *fp = pd->fp; 3080 __le32 buf[3]; 3081 size_t items, len; 3082 int rc; 3083 3084 len = strlen(key); 3085 items = 0; 3086 buf[items++] = cpu_to_le32(len); 3087 buf[items++] = cpu_to_le32(usrdatum->value); 3088 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) 3089 buf[items++] = cpu_to_le32(usrdatum->bounds); 3090 BUG_ON(items > ARRAY_SIZE(buf)); 3091 rc = put_entry(buf, sizeof(u32), items, fp); 3092 if (rc) 3093 return rc; 3094 3095 rc = put_entry(key, 1, len, fp); 3096 if (rc) 3097 return rc; 3098 3099 rc = ebitmap_write(&usrdatum->roles, fp); 3100 if (rc) 3101 return rc; 3102 3103 rc = mls_write_range_helper(&usrdatum->range, fp); 3104 if (rc) 3105 return rc; 3106 3107 rc = mls_write_level(&usrdatum->dfltlevel, fp); 3108 if (rc) 3109 return rc; 3110 3111 return 0; 3112 } 3113 3114 static int (*write_f[SYM_NUM]) (void *key, void *datum, 3115 void *datap) = 3116 { 3117 common_write, 3118 class_write, 3119 role_write, 3120 type_write, 3121 user_write, 3122 cond_write_bool, 3123 sens_write, 3124 cat_write, 3125 }; 3126 3127 static int ocontext_write(struct policydb *p, struct policydb_compat_info *info, 3128 void *fp) 3129 { 3130 unsigned int i, j, rc; 3131 size_t nel, len; 3132 __be64 prefixbuf[1]; 3133 __le32 buf[3]; 3134 u32 nodebuf[8]; 3135 struct ocontext *c; 3136 for (i = 0; i < info->ocon_num; i++) { 3137 nel = 0; 3138 for (c = p->ocontexts[i]; c; c = c->next) 3139 nel++; 3140 buf[0] = cpu_to_le32(nel); 3141 rc = put_entry(buf, sizeof(u32), 1, fp); 3142 if (rc) 3143 return rc; 3144 for (c = p->ocontexts[i]; c; c = c->next) { 3145 switch (i) { 3146 case OCON_ISID: 3147 buf[0] = cpu_to_le32(c->sid[0]); 3148 rc = put_entry(buf, sizeof(u32), 1, fp); 3149 if (rc) 3150 return rc; 3151 rc = context_write(p, &c->context[0], fp); 3152 if (rc) 3153 return rc; 3154 break; 3155 case OCON_FS: 3156 case OCON_NETIF: 3157 len = strlen(c->u.name); 3158 buf[0] = cpu_to_le32(len); 3159 rc = put_entry(buf, sizeof(u32), 1, fp); 3160 if (rc) 3161 return rc; 3162 rc = put_entry(c->u.name, 1, len, fp); 3163 if (rc) 3164 return rc; 3165 rc = context_write(p, &c->context[0], fp); 3166 if (rc) 3167 return rc; 3168 rc = context_write(p, &c->context[1], fp); 3169 if (rc) 3170 return rc; 3171 break; 3172 case OCON_PORT: 3173 buf[0] = cpu_to_le32(c->u.port.protocol); 3174 buf[1] = cpu_to_le32(c->u.port.low_port); 3175 buf[2] = cpu_to_le32(c->u.port.high_port); 3176 rc = put_entry(buf, sizeof(u32), 3, fp); 3177 if (rc) 3178 return rc; 3179 rc = context_write(p, &c->context[0], fp); 3180 if (rc) 3181 return rc; 3182 break; 3183 case OCON_NODE: 3184 nodebuf[0] = c->u.node.addr; /* network order */ 3185 nodebuf[1] = c->u.node.mask; /* network order */ 3186 rc = put_entry(nodebuf, sizeof(u32), 2, fp); 3187 if (rc) 3188 return rc; 3189 rc = context_write(p, &c->context[0], fp); 3190 if (rc) 3191 return rc; 3192 break; 3193 case OCON_FSUSE: 3194 buf[0] = cpu_to_le32(c->v.behavior); 3195 len = strlen(c->u.name); 3196 buf[1] = cpu_to_le32(len); 3197 rc = put_entry(buf, sizeof(u32), 2, fp); 3198 if (rc) 3199 return rc; 3200 rc = put_entry(c->u.name, 1, len, fp); 3201 if (rc) 3202 return rc; 3203 rc = context_write(p, &c->context[0], fp); 3204 if (rc) 3205 return rc; 3206 break; 3207 case OCON_NODE6: 3208 for (j = 0; j < 4; j++) 3209 nodebuf[j] = c->u.node6.addr[j]; /* network order */ 3210 for (j = 0; j < 4; j++) 3211 nodebuf[j + 4] = c->u.node6.mask[j]; /* network order */ 3212 rc = put_entry(nodebuf, sizeof(u32), 8, fp); 3213 if (rc) 3214 return rc; 3215 rc = context_write(p, &c->context[0], fp); 3216 if (rc) 3217 return rc; 3218 break; 3219 case OCON_IBPKEY: 3220 /* subnet_prefix is in CPU order */ 3221 prefixbuf[0] = cpu_to_be64(c->u.ibpkey.subnet_prefix); 3222 3223 rc = put_entry(prefixbuf, sizeof(u64), 1, fp); 3224 if (rc) 3225 return rc; 3226 3227 buf[0] = cpu_to_le32(c->u.ibpkey.low_pkey); 3228 buf[1] = cpu_to_le32(c->u.ibpkey.high_pkey); 3229 3230 rc = put_entry(buf, sizeof(u32), 2, fp); 3231 if (rc) 3232 return rc; 3233 rc = context_write(p, &c->context[0], fp); 3234 if (rc) 3235 return rc; 3236 break; 3237 case OCON_IBENDPORT: 3238 len = strlen(c->u.ibendport.dev_name); 3239 buf[0] = cpu_to_le32(len); 3240 buf[1] = cpu_to_le32(c->u.ibendport.port); 3241 rc = put_entry(buf, sizeof(u32), 2, fp); 3242 if (rc) 3243 return rc; 3244 rc = put_entry(c->u.ibendport.dev_name, 1, len, fp); 3245 if (rc) 3246 return rc; 3247 rc = context_write(p, &c->context[0], fp); 3248 if (rc) 3249 return rc; 3250 break; 3251 } 3252 } 3253 } 3254 return 0; 3255 } 3256 3257 static int genfs_write(struct policydb *p, void *fp) 3258 { 3259 struct genfs *genfs; 3260 struct ocontext *c; 3261 size_t len; 3262 __le32 buf[1]; 3263 int rc; 3264 3265 len = 0; 3266 for (genfs = p->genfs; genfs; genfs = genfs->next) 3267 len++; 3268 buf[0] = cpu_to_le32(len); 3269 rc = put_entry(buf, sizeof(u32), 1, fp); 3270 if (rc) 3271 return rc; 3272 for (genfs = p->genfs; genfs; genfs = genfs->next) { 3273 len = strlen(genfs->fstype); 3274 buf[0] = cpu_to_le32(len); 3275 rc = put_entry(buf, sizeof(u32), 1, fp); 3276 if (rc) 3277 return rc; 3278 rc = put_entry(genfs->fstype, 1, len, fp); 3279 if (rc) 3280 return rc; 3281 len = 0; 3282 for (c = genfs->head; c; c = c->next) 3283 len++; 3284 buf[0] = cpu_to_le32(len); 3285 rc = put_entry(buf, sizeof(u32), 1, fp); 3286 if (rc) 3287 return rc; 3288 for (c = genfs->head; c; c = c->next) { 3289 len = strlen(c->u.name); 3290 buf[0] = cpu_to_le32(len); 3291 rc = put_entry(buf, sizeof(u32), 1, fp); 3292 if (rc) 3293 return rc; 3294 rc = put_entry(c->u.name, 1, len, fp); 3295 if (rc) 3296 return rc; 3297 buf[0] = cpu_to_le32(c->v.sclass); 3298 rc = put_entry(buf, sizeof(u32), 1, fp); 3299 if (rc) 3300 return rc; 3301 rc = context_write(p, &c->context[0], fp); 3302 if (rc) 3303 return rc; 3304 } 3305 } 3306 return 0; 3307 } 3308 3309 static int hashtab_cnt(void *key, void *data, void *ptr) 3310 { 3311 int *cnt = ptr; 3312 *cnt = *cnt + 1; 3313 3314 return 0; 3315 } 3316 3317 static int range_write_helper(void *key, void *data, void *ptr) 3318 { 3319 __le32 buf[2]; 3320 struct range_trans *rt = key; 3321 struct mls_range *r = data; 3322 struct policy_data *pd = ptr; 3323 void *fp = pd->fp; 3324 struct policydb *p = pd->p; 3325 int rc; 3326 3327 buf[0] = cpu_to_le32(rt->source_type); 3328 buf[1] = cpu_to_le32(rt->target_type); 3329 rc = put_entry(buf, sizeof(u32), 2, fp); 3330 if (rc) 3331 return rc; 3332 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) { 3333 buf[0] = cpu_to_le32(rt->target_class); 3334 rc = put_entry(buf, sizeof(u32), 1, fp); 3335 if (rc) 3336 return rc; 3337 } 3338 rc = mls_write_range_helper(r, fp); 3339 if (rc) 3340 return rc; 3341 3342 return 0; 3343 } 3344 3345 static int range_write(struct policydb *p, void *fp) 3346 { 3347 __le32 buf[1]; 3348 int rc, nel; 3349 struct policy_data pd; 3350 3351 pd.p = p; 3352 pd.fp = fp; 3353 3354 /* count the number of entries in the hashtab */ 3355 nel = 0; 3356 rc = hashtab_map(p->range_tr, hashtab_cnt, &nel); 3357 if (rc) 3358 return rc; 3359 3360 buf[0] = cpu_to_le32(nel); 3361 rc = put_entry(buf, sizeof(u32), 1, fp); 3362 if (rc) 3363 return rc; 3364 3365 /* actually write all of the entries */ 3366 rc = hashtab_map(p->range_tr, range_write_helper, &pd); 3367 if (rc) 3368 return rc; 3369 3370 return 0; 3371 } 3372 3373 static int filename_write_helper(void *key, void *data, void *ptr) 3374 { 3375 __le32 buf[4]; 3376 struct filename_trans *ft = key; 3377 struct filename_trans_datum *otype = data; 3378 void *fp = ptr; 3379 int rc; 3380 u32 len; 3381 3382 len = strlen(ft->name); 3383 buf[0] = cpu_to_le32(len); 3384 rc = put_entry(buf, sizeof(u32), 1, fp); 3385 if (rc) 3386 return rc; 3387 3388 rc = put_entry(ft->name, sizeof(char), len, fp); 3389 if (rc) 3390 return rc; 3391 3392 buf[0] = cpu_to_le32(ft->stype); 3393 buf[1] = cpu_to_le32(ft->ttype); 3394 buf[2] = cpu_to_le32(ft->tclass); 3395 buf[3] = cpu_to_le32(otype->otype); 3396 3397 rc = put_entry(buf, sizeof(u32), 4, fp); 3398 if (rc) 3399 return rc; 3400 3401 return 0; 3402 } 3403 3404 static int filename_trans_write(struct policydb *p, void *fp) 3405 { 3406 u32 nel; 3407 __le32 buf[1]; 3408 int rc; 3409 3410 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS) 3411 return 0; 3412 3413 nel = 0; 3414 rc = hashtab_map(p->filename_trans, hashtab_cnt, &nel); 3415 if (rc) 3416 return rc; 3417 3418 buf[0] = cpu_to_le32(nel); 3419 rc = put_entry(buf, sizeof(u32), 1, fp); 3420 if (rc) 3421 return rc; 3422 3423 rc = hashtab_map(p->filename_trans, filename_write_helper, fp); 3424 if (rc) 3425 return rc; 3426 3427 return 0; 3428 } 3429 3430 /* 3431 * Write the configuration data in a policy database 3432 * structure to a policy database binary representation 3433 * file. 3434 */ 3435 int policydb_write(struct policydb *p, void *fp) 3436 { 3437 unsigned int i, num_syms; 3438 int rc; 3439 __le32 buf[4]; 3440 u32 config; 3441 size_t len; 3442 struct policydb_compat_info *info; 3443 3444 /* 3445 * refuse to write policy older than compressed avtab 3446 * to simplify the writer. There are other tests dropped 3447 * since we assume this throughout the writer code. Be 3448 * careful if you ever try to remove this restriction 3449 */ 3450 if (p->policyvers < POLICYDB_VERSION_AVTAB) { 3451 pr_err("SELinux: refusing to write policy version %d." 3452 " Because it is less than version %d\n", p->policyvers, 3453 POLICYDB_VERSION_AVTAB); 3454 return -EINVAL; 3455 } 3456 3457 config = 0; 3458 if (p->mls_enabled) 3459 config |= POLICYDB_CONFIG_MLS; 3460 3461 if (p->reject_unknown) 3462 config |= REJECT_UNKNOWN; 3463 if (p->allow_unknown) 3464 config |= ALLOW_UNKNOWN; 3465 3466 /* Write the magic number and string identifiers. */ 3467 buf[0] = cpu_to_le32(POLICYDB_MAGIC); 3468 len = strlen(POLICYDB_STRING); 3469 buf[1] = cpu_to_le32(len); 3470 rc = put_entry(buf, sizeof(u32), 2, fp); 3471 if (rc) 3472 return rc; 3473 rc = put_entry(POLICYDB_STRING, 1, len, fp); 3474 if (rc) 3475 return rc; 3476 3477 /* Write the version, config, and table sizes. */ 3478 info = policydb_lookup_compat(p->policyvers); 3479 if (!info) { 3480 pr_err("SELinux: compatibility lookup failed for policy " 3481 "version %d", p->policyvers); 3482 return -EINVAL; 3483 } 3484 3485 buf[0] = cpu_to_le32(p->policyvers); 3486 buf[1] = cpu_to_le32(config); 3487 buf[2] = cpu_to_le32(info->sym_num); 3488 buf[3] = cpu_to_le32(info->ocon_num); 3489 3490 rc = put_entry(buf, sizeof(u32), 4, fp); 3491 if (rc) 3492 return rc; 3493 3494 if (p->policyvers >= POLICYDB_VERSION_POLCAP) { 3495 rc = ebitmap_write(&p->policycaps, fp); 3496 if (rc) 3497 return rc; 3498 } 3499 3500 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) { 3501 rc = ebitmap_write(&p->permissive_map, fp); 3502 if (rc) 3503 return rc; 3504 } 3505 3506 num_syms = info->sym_num; 3507 for (i = 0; i < num_syms; i++) { 3508 struct policy_data pd; 3509 3510 pd.fp = fp; 3511 pd.p = p; 3512 3513 buf[0] = cpu_to_le32(p->symtab[i].nprim); 3514 buf[1] = cpu_to_le32(p->symtab[i].table->nel); 3515 3516 rc = put_entry(buf, sizeof(u32), 2, fp); 3517 if (rc) 3518 return rc; 3519 rc = hashtab_map(p->symtab[i].table, write_f[i], &pd); 3520 if (rc) 3521 return rc; 3522 } 3523 3524 rc = avtab_write(p, &p->te_avtab, fp); 3525 if (rc) 3526 return rc; 3527 3528 rc = cond_write_list(p, p->cond_list, fp); 3529 if (rc) 3530 return rc; 3531 3532 rc = role_trans_write(p, fp); 3533 if (rc) 3534 return rc; 3535 3536 rc = role_allow_write(p->role_allow, fp); 3537 if (rc) 3538 return rc; 3539 3540 rc = filename_trans_write(p, fp); 3541 if (rc) 3542 return rc; 3543 3544 rc = ocontext_write(p, info, fp); 3545 if (rc) 3546 return rc; 3547 3548 rc = genfs_write(p, fp); 3549 if (rc) 3550 return rc; 3551 3552 rc = range_write(p, fp); 3553 if (rc) 3554 return rc; 3555 3556 for (i = 0; i < p->p_types.nprim; i++) { 3557 struct ebitmap *e = flex_array_get(p->type_attr_map_array, i); 3558 3559 BUG_ON(!e); 3560 rc = ebitmap_write(e, fp); 3561 if (rc) 3562 return rc; 3563 } 3564 3565 return 0; 3566 } 3567