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 ebitmap_destroy(&levdatum->level->cat); 736 kfree(levdatum->level); 737 } 738 kfree(datum); 739 return 0; 740 } 741 742 static int cat_destroy(void *key, void *datum, void *p) 743 { 744 kfree(key); 745 kfree(datum); 746 return 0; 747 } 748 749 static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) = 750 { 751 common_destroy, 752 cls_destroy, 753 role_destroy, 754 type_destroy, 755 user_destroy, 756 cond_destroy_bool, 757 sens_destroy, 758 cat_destroy, 759 }; 760 761 static int filenametr_destroy(void *key, void *datum, void *p) 762 { 763 struct filename_trans *ft = key; 764 kfree(ft->name); 765 kfree(key); 766 kfree(datum); 767 cond_resched(); 768 return 0; 769 } 770 771 static int range_tr_destroy(void *key, void *datum, void *p) 772 { 773 struct mls_range *rt = datum; 774 kfree(key); 775 ebitmap_destroy(&rt->level[0].cat); 776 ebitmap_destroy(&rt->level[1].cat); 777 kfree(datum); 778 cond_resched(); 779 return 0; 780 } 781 782 static void ocontext_destroy(struct ocontext *c, int i) 783 { 784 if (!c) 785 return; 786 787 context_destroy(&c->context[0]); 788 context_destroy(&c->context[1]); 789 if (i == OCON_ISID || i == OCON_FS || 790 i == OCON_NETIF || i == OCON_FSUSE) 791 kfree(c->u.name); 792 kfree(c); 793 } 794 795 /* 796 * Free any memory allocated by a policy database structure. 797 */ 798 void policydb_destroy(struct policydb *p) 799 { 800 struct ocontext *c, *ctmp; 801 struct genfs *g, *gtmp; 802 int i; 803 struct role_allow *ra, *lra = NULL; 804 struct role_trans *tr, *ltr = NULL; 805 806 for (i = 0; i < SYM_NUM; i++) { 807 cond_resched(); 808 hashtab_map(p->symtab[i].table, destroy_f[i], NULL); 809 hashtab_destroy(p->symtab[i].table); 810 } 811 812 for (i = 0; i < SYM_NUM; i++) { 813 if (p->sym_val_to_name[i]) 814 flex_array_free(p->sym_val_to_name[i]); 815 } 816 817 kfree(p->class_val_to_struct); 818 kfree(p->role_val_to_struct); 819 kfree(p->user_val_to_struct); 820 if (p->type_val_to_struct_array) 821 flex_array_free(p->type_val_to_struct_array); 822 823 avtab_destroy(&p->te_avtab); 824 825 for (i = 0; i < OCON_NUM; i++) { 826 cond_resched(); 827 c = p->ocontexts[i]; 828 while (c) { 829 ctmp = c; 830 c = c->next; 831 ocontext_destroy(ctmp, i); 832 } 833 p->ocontexts[i] = NULL; 834 } 835 836 g = p->genfs; 837 while (g) { 838 cond_resched(); 839 kfree(g->fstype); 840 c = g->head; 841 while (c) { 842 ctmp = c; 843 c = c->next; 844 ocontext_destroy(ctmp, OCON_FSUSE); 845 } 846 gtmp = g; 847 g = g->next; 848 kfree(gtmp); 849 } 850 p->genfs = NULL; 851 852 cond_policydb_destroy(p); 853 854 for (tr = p->role_tr; tr; tr = tr->next) { 855 cond_resched(); 856 kfree(ltr); 857 ltr = tr; 858 } 859 kfree(ltr); 860 861 for (ra = p->role_allow; ra; ra = ra->next) { 862 cond_resched(); 863 kfree(lra); 864 lra = ra; 865 } 866 kfree(lra); 867 868 hashtab_map(p->filename_trans, filenametr_destroy, NULL); 869 hashtab_destroy(p->filename_trans); 870 871 hashtab_map(p->range_tr, range_tr_destroy, NULL); 872 hashtab_destroy(p->range_tr); 873 874 if (p->type_attr_map_array) { 875 for (i = 0; i < p->p_types.nprim; i++) { 876 struct ebitmap *e; 877 878 e = flex_array_get(p->type_attr_map_array, i); 879 if (!e) 880 continue; 881 ebitmap_destroy(e); 882 } 883 flex_array_free(p->type_attr_map_array); 884 } 885 886 ebitmap_destroy(&p->filename_trans_ttypes); 887 ebitmap_destroy(&p->policycaps); 888 ebitmap_destroy(&p->permissive_map); 889 } 890 891 /* 892 * Load the initial SIDs specified in a policy database 893 * structure into a SID table. 894 */ 895 int policydb_load_isids(struct policydb *p, struct sidtab *s) 896 { 897 struct ocontext *head, *c; 898 int rc; 899 900 rc = sidtab_init(s); 901 if (rc) { 902 pr_err("SELinux: out of memory on SID table init\n"); 903 goto out; 904 } 905 906 head = p->ocontexts[OCON_ISID]; 907 for (c = head; c; c = c->next) { 908 rc = -EINVAL; 909 if (!c->context[0].user) { 910 pr_err("SELinux: SID %s was never defined.\n", 911 c->u.name); 912 sidtab_destroy(s); 913 goto out; 914 } 915 if (c->sid[0] == SECSID_NULL || c->sid[0] > SECINITSID_NUM) { 916 pr_err("SELinux: Initial SID %s out of range.\n", 917 c->u.name); 918 sidtab_destroy(s); 919 goto out; 920 } 921 922 rc = sidtab_set_initial(s, c->sid[0], &c->context[0]); 923 if (rc) { 924 pr_err("SELinux: unable to load initial SID %s.\n", 925 c->u.name); 926 sidtab_destroy(s); 927 goto out; 928 } 929 } 930 rc = 0; 931 out: 932 return rc; 933 } 934 935 int policydb_class_isvalid(struct policydb *p, unsigned int class) 936 { 937 if (!class || class > p->p_classes.nprim) 938 return 0; 939 return 1; 940 } 941 942 int policydb_role_isvalid(struct policydb *p, unsigned int role) 943 { 944 if (!role || role > p->p_roles.nprim) 945 return 0; 946 return 1; 947 } 948 949 int policydb_type_isvalid(struct policydb *p, unsigned int type) 950 { 951 if (!type || type > p->p_types.nprim) 952 return 0; 953 return 1; 954 } 955 956 /* 957 * Return 1 if the fields in the security context 958 * structure `c' are valid. Return 0 otherwise. 959 */ 960 int policydb_context_isvalid(struct policydb *p, struct context *c) 961 { 962 struct role_datum *role; 963 struct user_datum *usrdatum; 964 965 if (!c->role || c->role > p->p_roles.nprim) 966 return 0; 967 968 if (!c->user || c->user > p->p_users.nprim) 969 return 0; 970 971 if (!c->type || c->type > p->p_types.nprim) 972 return 0; 973 974 if (c->role != OBJECT_R_VAL) { 975 /* 976 * Role must be authorized for the type. 977 */ 978 role = p->role_val_to_struct[c->role - 1]; 979 if (!role || !ebitmap_get_bit(&role->types, c->type - 1)) 980 /* role may not be associated with type */ 981 return 0; 982 983 /* 984 * User must be authorized for the role. 985 */ 986 usrdatum = p->user_val_to_struct[c->user - 1]; 987 if (!usrdatum) 988 return 0; 989 990 if (!ebitmap_get_bit(&usrdatum->roles, c->role - 1)) 991 /* user may not be associated with role */ 992 return 0; 993 } 994 995 if (!mls_context_isvalid(p, c)) 996 return 0; 997 998 return 1; 999 } 1000 1001 /* 1002 * Read a MLS range structure from a policydb binary 1003 * representation file. 1004 */ 1005 static int mls_read_range_helper(struct mls_range *r, void *fp) 1006 { 1007 __le32 buf[2]; 1008 u32 items; 1009 int rc; 1010 1011 rc = next_entry(buf, fp, sizeof(u32)); 1012 if (rc) 1013 goto out; 1014 1015 rc = -EINVAL; 1016 items = le32_to_cpu(buf[0]); 1017 if (items > ARRAY_SIZE(buf)) { 1018 pr_err("SELinux: mls: range overflow\n"); 1019 goto out; 1020 } 1021 1022 rc = next_entry(buf, fp, sizeof(u32) * items); 1023 if (rc) { 1024 pr_err("SELinux: mls: truncated range\n"); 1025 goto out; 1026 } 1027 1028 r->level[0].sens = le32_to_cpu(buf[0]); 1029 if (items > 1) 1030 r->level[1].sens = le32_to_cpu(buf[1]); 1031 else 1032 r->level[1].sens = r->level[0].sens; 1033 1034 rc = ebitmap_read(&r->level[0].cat, fp); 1035 if (rc) { 1036 pr_err("SELinux: mls: error reading low categories\n"); 1037 goto out; 1038 } 1039 if (items > 1) { 1040 rc = ebitmap_read(&r->level[1].cat, fp); 1041 if (rc) { 1042 pr_err("SELinux: mls: error reading high categories\n"); 1043 goto bad_high; 1044 } 1045 } else { 1046 rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat); 1047 if (rc) { 1048 pr_err("SELinux: mls: out of memory\n"); 1049 goto bad_high; 1050 } 1051 } 1052 1053 return 0; 1054 bad_high: 1055 ebitmap_destroy(&r->level[0].cat); 1056 out: 1057 return rc; 1058 } 1059 1060 /* 1061 * Read and validate a security context structure 1062 * from a policydb binary representation file. 1063 */ 1064 static int context_read_and_validate(struct context *c, 1065 struct policydb *p, 1066 void *fp) 1067 { 1068 __le32 buf[3]; 1069 int rc; 1070 1071 rc = next_entry(buf, fp, sizeof buf); 1072 if (rc) { 1073 pr_err("SELinux: context truncated\n"); 1074 goto out; 1075 } 1076 c->user = le32_to_cpu(buf[0]); 1077 c->role = le32_to_cpu(buf[1]); 1078 c->type = le32_to_cpu(buf[2]); 1079 if (p->policyvers >= POLICYDB_VERSION_MLS) { 1080 rc = mls_read_range_helper(&c->range, fp); 1081 if (rc) { 1082 pr_err("SELinux: error reading MLS range of context\n"); 1083 goto out; 1084 } 1085 } 1086 1087 rc = -EINVAL; 1088 if (!policydb_context_isvalid(p, c)) { 1089 pr_err("SELinux: invalid security context\n"); 1090 context_destroy(c); 1091 goto out; 1092 } 1093 rc = 0; 1094 out: 1095 return rc; 1096 } 1097 1098 /* 1099 * The following *_read functions are used to 1100 * read the symbol data from a policy database 1101 * binary representation file. 1102 */ 1103 1104 static int str_read(char **strp, gfp_t flags, void *fp, u32 len) 1105 { 1106 int rc; 1107 char *str; 1108 1109 if ((len == 0) || (len == (u32)-1)) 1110 return -EINVAL; 1111 1112 str = kmalloc(len + 1, flags | __GFP_NOWARN); 1113 if (!str) 1114 return -ENOMEM; 1115 1116 /* it's expected the caller should free the str */ 1117 *strp = str; 1118 1119 rc = next_entry(str, fp, len); 1120 if (rc) 1121 return rc; 1122 1123 str[len] = '\0'; 1124 return 0; 1125 } 1126 1127 static int perm_read(struct policydb *p, struct hashtab *h, void *fp) 1128 { 1129 char *key = NULL; 1130 struct perm_datum *perdatum; 1131 int rc; 1132 __le32 buf[2]; 1133 u32 len; 1134 1135 perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL); 1136 if (!perdatum) 1137 return -ENOMEM; 1138 1139 rc = next_entry(buf, fp, sizeof buf); 1140 if (rc) 1141 goto bad; 1142 1143 len = le32_to_cpu(buf[0]); 1144 perdatum->value = le32_to_cpu(buf[1]); 1145 1146 rc = str_read(&key, GFP_KERNEL, fp, len); 1147 if (rc) 1148 goto bad; 1149 1150 rc = hashtab_insert(h, key, perdatum); 1151 if (rc) 1152 goto bad; 1153 1154 return 0; 1155 bad: 1156 perm_destroy(key, perdatum, NULL); 1157 return rc; 1158 } 1159 1160 static int common_read(struct policydb *p, struct hashtab *h, void *fp) 1161 { 1162 char *key = NULL; 1163 struct common_datum *comdatum; 1164 __le32 buf[4]; 1165 u32 len, nel; 1166 int i, rc; 1167 1168 comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL); 1169 if (!comdatum) 1170 return -ENOMEM; 1171 1172 rc = next_entry(buf, fp, sizeof buf); 1173 if (rc) 1174 goto bad; 1175 1176 len = le32_to_cpu(buf[0]); 1177 comdatum->value = le32_to_cpu(buf[1]); 1178 1179 rc = symtab_init(&comdatum->permissions, PERM_SYMTAB_SIZE); 1180 if (rc) 1181 goto bad; 1182 comdatum->permissions.nprim = le32_to_cpu(buf[2]); 1183 nel = le32_to_cpu(buf[3]); 1184 1185 rc = str_read(&key, GFP_KERNEL, fp, len); 1186 if (rc) 1187 goto bad; 1188 1189 for (i = 0; i < nel; i++) { 1190 rc = perm_read(p, comdatum->permissions.table, fp); 1191 if (rc) 1192 goto bad; 1193 } 1194 1195 rc = hashtab_insert(h, key, comdatum); 1196 if (rc) 1197 goto bad; 1198 return 0; 1199 bad: 1200 common_destroy(key, comdatum, NULL); 1201 return rc; 1202 } 1203 1204 static void type_set_init(struct type_set *t) 1205 { 1206 ebitmap_init(&t->types); 1207 ebitmap_init(&t->negset); 1208 } 1209 1210 static int type_set_read(struct type_set *t, void *fp) 1211 { 1212 __le32 buf[1]; 1213 int rc; 1214 1215 if (ebitmap_read(&t->types, fp)) 1216 return -EINVAL; 1217 if (ebitmap_read(&t->negset, fp)) 1218 return -EINVAL; 1219 1220 rc = next_entry(buf, fp, sizeof(u32)); 1221 if (rc < 0) 1222 return -EINVAL; 1223 t->flags = le32_to_cpu(buf[0]); 1224 1225 return 0; 1226 } 1227 1228 1229 static int read_cons_helper(struct policydb *p, 1230 struct constraint_node **nodep, 1231 int ncons, int allowxtarget, void *fp) 1232 { 1233 struct constraint_node *c, *lc; 1234 struct constraint_expr *e, *le; 1235 __le32 buf[3]; 1236 u32 nexpr; 1237 int rc, i, j, depth; 1238 1239 lc = NULL; 1240 for (i = 0; i < ncons; i++) { 1241 c = kzalloc(sizeof(*c), GFP_KERNEL); 1242 if (!c) 1243 return -ENOMEM; 1244 1245 if (lc) 1246 lc->next = c; 1247 else 1248 *nodep = c; 1249 1250 rc = next_entry(buf, fp, (sizeof(u32) * 2)); 1251 if (rc) 1252 return rc; 1253 c->permissions = le32_to_cpu(buf[0]); 1254 nexpr = le32_to_cpu(buf[1]); 1255 le = NULL; 1256 depth = -1; 1257 for (j = 0; j < nexpr; j++) { 1258 e = kzalloc(sizeof(*e), GFP_KERNEL); 1259 if (!e) 1260 return -ENOMEM; 1261 1262 if (le) 1263 le->next = e; 1264 else 1265 c->expr = e; 1266 1267 rc = next_entry(buf, fp, (sizeof(u32) * 3)); 1268 if (rc) 1269 return rc; 1270 e->expr_type = le32_to_cpu(buf[0]); 1271 e->attr = le32_to_cpu(buf[1]); 1272 e->op = le32_to_cpu(buf[2]); 1273 1274 switch (e->expr_type) { 1275 case CEXPR_NOT: 1276 if (depth < 0) 1277 return -EINVAL; 1278 break; 1279 case CEXPR_AND: 1280 case CEXPR_OR: 1281 if (depth < 1) 1282 return -EINVAL; 1283 depth--; 1284 break; 1285 case CEXPR_ATTR: 1286 if (depth == (CEXPR_MAXDEPTH - 1)) 1287 return -EINVAL; 1288 depth++; 1289 break; 1290 case CEXPR_NAMES: 1291 if (!allowxtarget && (e->attr & CEXPR_XTARGET)) 1292 return -EINVAL; 1293 if (depth == (CEXPR_MAXDEPTH - 1)) 1294 return -EINVAL; 1295 depth++; 1296 rc = ebitmap_read(&e->names, fp); 1297 if (rc) 1298 return rc; 1299 if (p->policyvers >= 1300 POLICYDB_VERSION_CONSTRAINT_NAMES) { 1301 e->type_names = kzalloc(sizeof 1302 (*e->type_names), 1303 GFP_KERNEL); 1304 if (!e->type_names) 1305 return -ENOMEM; 1306 type_set_init(e->type_names); 1307 rc = type_set_read(e->type_names, fp); 1308 if (rc) 1309 return rc; 1310 } 1311 break; 1312 default: 1313 return -EINVAL; 1314 } 1315 le = e; 1316 } 1317 if (depth != 0) 1318 return -EINVAL; 1319 lc = c; 1320 } 1321 1322 return 0; 1323 } 1324 1325 static int class_read(struct policydb *p, struct hashtab *h, void *fp) 1326 { 1327 char *key = NULL; 1328 struct class_datum *cladatum; 1329 __le32 buf[6]; 1330 u32 len, len2, ncons, nel; 1331 int i, rc; 1332 1333 cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL); 1334 if (!cladatum) 1335 return -ENOMEM; 1336 1337 rc = next_entry(buf, fp, sizeof(u32)*6); 1338 if (rc) 1339 goto bad; 1340 1341 len = le32_to_cpu(buf[0]); 1342 len2 = le32_to_cpu(buf[1]); 1343 cladatum->value = le32_to_cpu(buf[2]); 1344 1345 rc = symtab_init(&cladatum->permissions, PERM_SYMTAB_SIZE); 1346 if (rc) 1347 goto bad; 1348 cladatum->permissions.nprim = le32_to_cpu(buf[3]); 1349 nel = le32_to_cpu(buf[4]); 1350 1351 ncons = le32_to_cpu(buf[5]); 1352 1353 rc = str_read(&key, GFP_KERNEL, fp, len); 1354 if (rc) 1355 goto bad; 1356 1357 if (len2) { 1358 rc = str_read(&cladatum->comkey, GFP_KERNEL, fp, len2); 1359 if (rc) 1360 goto bad; 1361 1362 rc = -EINVAL; 1363 cladatum->comdatum = hashtab_search(p->p_commons.table, cladatum->comkey); 1364 if (!cladatum->comdatum) { 1365 pr_err("SELinux: unknown common %s\n", 1366 cladatum->comkey); 1367 goto bad; 1368 } 1369 } 1370 for (i = 0; i < nel; i++) { 1371 rc = perm_read(p, cladatum->permissions.table, fp); 1372 if (rc) 1373 goto bad; 1374 } 1375 1376 rc = read_cons_helper(p, &cladatum->constraints, ncons, 0, fp); 1377 if (rc) 1378 goto bad; 1379 1380 if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) { 1381 /* grab the validatetrans rules */ 1382 rc = next_entry(buf, fp, sizeof(u32)); 1383 if (rc) 1384 goto bad; 1385 ncons = le32_to_cpu(buf[0]); 1386 rc = read_cons_helper(p, &cladatum->validatetrans, 1387 ncons, 1, fp); 1388 if (rc) 1389 goto bad; 1390 } 1391 1392 if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) { 1393 rc = next_entry(buf, fp, sizeof(u32) * 3); 1394 if (rc) 1395 goto bad; 1396 1397 cladatum->default_user = le32_to_cpu(buf[0]); 1398 cladatum->default_role = le32_to_cpu(buf[1]); 1399 cladatum->default_range = le32_to_cpu(buf[2]); 1400 } 1401 1402 if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) { 1403 rc = next_entry(buf, fp, sizeof(u32) * 1); 1404 if (rc) 1405 goto bad; 1406 cladatum->default_type = le32_to_cpu(buf[0]); 1407 } 1408 1409 rc = hashtab_insert(h, key, cladatum); 1410 if (rc) 1411 goto bad; 1412 1413 return 0; 1414 bad: 1415 cls_destroy(key, cladatum, NULL); 1416 return rc; 1417 } 1418 1419 static int role_read(struct policydb *p, struct hashtab *h, void *fp) 1420 { 1421 char *key = NULL; 1422 struct role_datum *role; 1423 int rc, to_read = 2; 1424 __le32 buf[3]; 1425 u32 len; 1426 1427 role = kzalloc(sizeof(*role), GFP_KERNEL); 1428 if (!role) 1429 return -ENOMEM; 1430 1431 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) 1432 to_read = 3; 1433 1434 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read); 1435 if (rc) 1436 goto bad; 1437 1438 len = le32_to_cpu(buf[0]); 1439 role->value = le32_to_cpu(buf[1]); 1440 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) 1441 role->bounds = le32_to_cpu(buf[2]); 1442 1443 rc = str_read(&key, GFP_KERNEL, fp, len); 1444 if (rc) 1445 goto bad; 1446 1447 rc = ebitmap_read(&role->dominates, fp); 1448 if (rc) 1449 goto bad; 1450 1451 rc = ebitmap_read(&role->types, fp); 1452 if (rc) 1453 goto bad; 1454 1455 if (strcmp(key, OBJECT_R) == 0) { 1456 rc = -EINVAL; 1457 if (role->value != OBJECT_R_VAL) { 1458 pr_err("SELinux: Role %s has wrong value %d\n", 1459 OBJECT_R, role->value); 1460 goto bad; 1461 } 1462 rc = 0; 1463 goto bad; 1464 } 1465 1466 rc = hashtab_insert(h, key, role); 1467 if (rc) 1468 goto bad; 1469 return 0; 1470 bad: 1471 role_destroy(key, role, NULL); 1472 return rc; 1473 } 1474 1475 static int type_read(struct policydb *p, struct hashtab *h, void *fp) 1476 { 1477 char *key = NULL; 1478 struct type_datum *typdatum; 1479 int rc, to_read = 3; 1480 __le32 buf[4]; 1481 u32 len; 1482 1483 typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL); 1484 if (!typdatum) 1485 return -ENOMEM; 1486 1487 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) 1488 to_read = 4; 1489 1490 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read); 1491 if (rc) 1492 goto bad; 1493 1494 len = le32_to_cpu(buf[0]); 1495 typdatum->value = le32_to_cpu(buf[1]); 1496 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) { 1497 u32 prop = le32_to_cpu(buf[2]); 1498 1499 if (prop & TYPEDATUM_PROPERTY_PRIMARY) 1500 typdatum->primary = 1; 1501 if (prop & TYPEDATUM_PROPERTY_ATTRIBUTE) 1502 typdatum->attribute = 1; 1503 1504 typdatum->bounds = le32_to_cpu(buf[3]); 1505 } else { 1506 typdatum->primary = le32_to_cpu(buf[2]); 1507 } 1508 1509 rc = str_read(&key, GFP_KERNEL, fp, len); 1510 if (rc) 1511 goto bad; 1512 1513 rc = hashtab_insert(h, key, typdatum); 1514 if (rc) 1515 goto bad; 1516 return 0; 1517 bad: 1518 type_destroy(key, typdatum, NULL); 1519 return rc; 1520 } 1521 1522 1523 /* 1524 * Read a MLS level structure from a policydb binary 1525 * representation file. 1526 */ 1527 static int mls_read_level(struct mls_level *lp, void *fp) 1528 { 1529 __le32 buf[1]; 1530 int rc; 1531 1532 memset(lp, 0, sizeof(*lp)); 1533 1534 rc = next_entry(buf, fp, sizeof buf); 1535 if (rc) { 1536 pr_err("SELinux: mls: truncated level\n"); 1537 return rc; 1538 } 1539 lp->sens = le32_to_cpu(buf[0]); 1540 1541 rc = ebitmap_read(&lp->cat, fp); 1542 if (rc) { 1543 pr_err("SELinux: mls: error reading level categories\n"); 1544 return rc; 1545 } 1546 return 0; 1547 } 1548 1549 static int user_read(struct policydb *p, struct hashtab *h, void *fp) 1550 { 1551 char *key = NULL; 1552 struct user_datum *usrdatum; 1553 int rc, to_read = 2; 1554 __le32 buf[3]; 1555 u32 len; 1556 1557 usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL); 1558 if (!usrdatum) 1559 return -ENOMEM; 1560 1561 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) 1562 to_read = 3; 1563 1564 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read); 1565 if (rc) 1566 goto bad; 1567 1568 len = le32_to_cpu(buf[0]); 1569 usrdatum->value = le32_to_cpu(buf[1]); 1570 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) 1571 usrdatum->bounds = le32_to_cpu(buf[2]); 1572 1573 rc = str_read(&key, GFP_KERNEL, fp, len); 1574 if (rc) 1575 goto bad; 1576 1577 rc = ebitmap_read(&usrdatum->roles, fp); 1578 if (rc) 1579 goto bad; 1580 1581 if (p->policyvers >= POLICYDB_VERSION_MLS) { 1582 rc = mls_read_range_helper(&usrdatum->range, fp); 1583 if (rc) 1584 goto bad; 1585 rc = mls_read_level(&usrdatum->dfltlevel, fp); 1586 if (rc) 1587 goto bad; 1588 } 1589 1590 rc = hashtab_insert(h, key, usrdatum); 1591 if (rc) 1592 goto bad; 1593 return 0; 1594 bad: 1595 user_destroy(key, usrdatum, NULL); 1596 return rc; 1597 } 1598 1599 static int sens_read(struct policydb *p, struct hashtab *h, void *fp) 1600 { 1601 char *key = NULL; 1602 struct level_datum *levdatum; 1603 int rc; 1604 __le32 buf[2]; 1605 u32 len; 1606 1607 levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC); 1608 if (!levdatum) 1609 return -ENOMEM; 1610 1611 rc = next_entry(buf, fp, sizeof buf); 1612 if (rc) 1613 goto bad; 1614 1615 len = le32_to_cpu(buf[0]); 1616 levdatum->isalias = le32_to_cpu(buf[1]); 1617 1618 rc = str_read(&key, GFP_ATOMIC, fp, len); 1619 if (rc) 1620 goto bad; 1621 1622 rc = -ENOMEM; 1623 levdatum->level = kmalloc(sizeof(*levdatum->level), GFP_ATOMIC); 1624 if (!levdatum->level) 1625 goto bad; 1626 1627 rc = mls_read_level(levdatum->level, fp); 1628 if (rc) 1629 goto bad; 1630 1631 rc = hashtab_insert(h, key, levdatum); 1632 if (rc) 1633 goto bad; 1634 return 0; 1635 bad: 1636 sens_destroy(key, levdatum, NULL); 1637 return rc; 1638 } 1639 1640 static int cat_read(struct policydb *p, struct hashtab *h, void *fp) 1641 { 1642 char *key = NULL; 1643 struct cat_datum *catdatum; 1644 int rc; 1645 __le32 buf[3]; 1646 u32 len; 1647 1648 catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC); 1649 if (!catdatum) 1650 return -ENOMEM; 1651 1652 rc = next_entry(buf, fp, sizeof buf); 1653 if (rc) 1654 goto bad; 1655 1656 len = le32_to_cpu(buf[0]); 1657 catdatum->value = le32_to_cpu(buf[1]); 1658 catdatum->isalias = le32_to_cpu(buf[2]); 1659 1660 rc = str_read(&key, GFP_ATOMIC, fp, len); 1661 if (rc) 1662 goto bad; 1663 1664 rc = hashtab_insert(h, key, catdatum); 1665 if (rc) 1666 goto bad; 1667 return 0; 1668 bad: 1669 cat_destroy(key, catdatum, NULL); 1670 return rc; 1671 } 1672 1673 static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, void *fp) = 1674 { 1675 common_read, 1676 class_read, 1677 role_read, 1678 type_read, 1679 user_read, 1680 cond_read_bool, 1681 sens_read, 1682 cat_read, 1683 }; 1684 1685 static int user_bounds_sanity_check(void *key, void *datum, void *datap) 1686 { 1687 struct user_datum *upper, *user; 1688 struct policydb *p = datap; 1689 int depth = 0; 1690 1691 upper = user = datum; 1692 while (upper->bounds) { 1693 struct ebitmap_node *node; 1694 unsigned long bit; 1695 1696 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) { 1697 pr_err("SELinux: user %s: " 1698 "too deep or looped boundary", 1699 (char *) key); 1700 return -EINVAL; 1701 } 1702 1703 upper = p->user_val_to_struct[upper->bounds - 1]; 1704 ebitmap_for_each_positive_bit(&user->roles, node, bit) { 1705 if (ebitmap_get_bit(&upper->roles, bit)) 1706 continue; 1707 1708 pr_err("SELinux: boundary violated policy: " 1709 "user=%s role=%s bounds=%s\n", 1710 sym_name(p, SYM_USERS, user->value - 1), 1711 sym_name(p, SYM_ROLES, bit), 1712 sym_name(p, SYM_USERS, upper->value - 1)); 1713 1714 return -EINVAL; 1715 } 1716 } 1717 1718 return 0; 1719 } 1720 1721 static int role_bounds_sanity_check(void *key, void *datum, void *datap) 1722 { 1723 struct role_datum *upper, *role; 1724 struct policydb *p = datap; 1725 int depth = 0; 1726 1727 upper = role = datum; 1728 while (upper->bounds) { 1729 struct ebitmap_node *node; 1730 unsigned long bit; 1731 1732 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) { 1733 pr_err("SELinux: role %s: " 1734 "too deep or looped bounds\n", 1735 (char *) key); 1736 return -EINVAL; 1737 } 1738 1739 upper = p->role_val_to_struct[upper->bounds - 1]; 1740 ebitmap_for_each_positive_bit(&role->types, node, bit) { 1741 if (ebitmap_get_bit(&upper->types, bit)) 1742 continue; 1743 1744 pr_err("SELinux: boundary violated policy: " 1745 "role=%s type=%s bounds=%s\n", 1746 sym_name(p, SYM_ROLES, role->value - 1), 1747 sym_name(p, SYM_TYPES, bit), 1748 sym_name(p, SYM_ROLES, upper->value - 1)); 1749 1750 return -EINVAL; 1751 } 1752 } 1753 1754 return 0; 1755 } 1756 1757 static int type_bounds_sanity_check(void *key, void *datum, void *datap) 1758 { 1759 struct type_datum *upper; 1760 struct policydb *p = datap; 1761 int depth = 0; 1762 1763 upper = datum; 1764 while (upper->bounds) { 1765 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) { 1766 pr_err("SELinux: type %s: " 1767 "too deep or looped boundary\n", 1768 (char *) key); 1769 return -EINVAL; 1770 } 1771 1772 upper = flex_array_get_ptr(p->type_val_to_struct_array, 1773 upper->bounds - 1); 1774 BUG_ON(!upper); 1775 1776 if (upper->attribute) { 1777 pr_err("SELinux: type %s: " 1778 "bounded by attribute %s", 1779 (char *) key, 1780 sym_name(p, SYM_TYPES, upper->value - 1)); 1781 return -EINVAL; 1782 } 1783 } 1784 1785 return 0; 1786 } 1787 1788 static int policydb_bounds_sanity_check(struct policydb *p) 1789 { 1790 int rc; 1791 1792 if (p->policyvers < POLICYDB_VERSION_BOUNDARY) 1793 return 0; 1794 1795 rc = hashtab_map(p->p_users.table, 1796 user_bounds_sanity_check, p); 1797 if (rc) 1798 return rc; 1799 1800 rc = hashtab_map(p->p_roles.table, 1801 role_bounds_sanity_check, p); 1802 if (rc) 1803 return rc; 1804 1805 rc = hashtab_map(p->p_types.table, 1806 type_bounds_sanity_check, p); 1807 if (rc) 1808 return rc; 1809 1810 return 0; 1811 } 1812 1813 u16 string_to_security_class(struct policydb *p, const char *name) 1814 { 1815 struct class_datum *cladatum; 1816 1817 cladatum = hashtab_search(p->p_classes.table, name); 1818 if (!cladatum) 1819 return 0; 1820 1821 return cladatum->value; 1822 } 1823 1824 u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name) 1825 { 1826 struct class_datum *cladatum; 1827 struct perm_datum *perdatum = NULL; 1828 struct common_datum *comdatum; 1829 1830 if (!tclass || tclass > p->p_classes.nprim) 1831 return 0; 1832 1833 cladatum = p->class_val_to_struct[tclass-1]; 1834 comdatum = cladatum->comdatum; 1835 if (comdatum) 1836 perdatum = hashtab_search(comdatum->permissions.table, 1837 name); 1838 if (!perdatum) 1839 perdatum = hashtab_search(cladatum->permissions.table, 1840 name); 1841 if (!perdatum) 1842 return 0; 1843 1844 return 1U << (perdatum->value-1); 1845 } 1846 1847 static int range_read(struct policydb *p, void *fp) 1848 { 1849 struct range_trans *rt = NULL; 1850 struct mls_range *r = NULL; 1851 int i, rc; 1852 __le32 buf[2]; 1853 u32 nel; 1854 1855 if (p->policyvers < POLICYDB_VERSION_MLS) 1856 return 0; 1857 1858 rc = next_entry(buf, fp, sizeof(u32)); 1859 if (rc) 1860 return rc; 1861 1862 nel = le32_to_cpu(buf[0]); 1863 for (i = 0; i < nel; i++) { 1864 rc = -ENOMEM; 1865 rt = kzalloc(sizeof(*rt), GFP_KERNEL); 1866 if (!rt) 1867 goto out; 1868 1869 rc = next_entry(buf, fp, (sizeof(u32) * 2)); 1870 if (rc) 1871 goto out; 1872 1873 rt->source_type = le32_to_cpu(buf[0]); 1874 rt->target_type = le32_to_cpu(buf[1]); 1875 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) { 1876 rc = next_entry(buf, fp, sizeof(u32)); 1877 if (rc) 1878 goto out; 1879 rt->target_class = le32_to_cpu(buf[0]); 1880 } else 1881 rt->target_class = p->process_class; 1882 1883 rc = -EINVAL; 1884 if (!policydb_type_isvalid(p, rt->source_type) || 1885 !policydb_type_isvalid(p, rt->target_type) || 1886 !policydb_class_isvalid(p, rt->target_class)) 1887 goto out; 1888 1889 rc = -ENOMEM; 1890 r = kzalloc(sizeof(*r), GFP_KERNEL); 1891 if (!r) 1892 goto out; 1893 1894 rc = mls_read_range_helper(r, fp); 1895 if (rc) 1896 goto out; 1897 1898 rc = -EINVAL; 1899 if (!mls_range_isvalid(p, r)) { 1900 pr_warn("SELinux: rangetrans: invalid range\n"); 1901 goto out; 1902 } 1903 1904 rc = hashtab_insert(p->range_tr, rt, r); 1905 if (rc) 1906 goto out; 1907 1908 rt = NULL; 1909 r = NULL; 1910 } 1911 hash_eval(p->range_tr, "rangetr"); 1912 rc = 0; 1913 out: 1914 kfree(rt); 1915 kfree(r); 1916 return rc; 1917 } 1918 1919 static int filename_trans_read(struct policydb *p, void *fp) 1920 { 1921 struct filename_trans *ft; 1922 struct filename_trans_datum *otype; 1923 char *name; 1924 u32 nel, len; 1925 __le32 buf[4]; 1926 int rc, i; 1927 1928 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS) 1929 return 0; 1930 1931 rc = next_entry(buf, fp, sizeof(u32)); 1932 if (rc) 1933 return rc; 1934 nel = le32_to_cpu(buf[0]); 1935 1936 for (i = 0; i < nel; i++) { 1937 otype = NULL; 1938 name = NULL; 1939 1940 rc = -ENOMEM; 1941 ft = kzalloc(sizeof(*ft), GFP_KERNEL); 1942 if (!ft) 1943 goto out; 1944 1945 rc = -ENOMEM; 1946 otype = kmalloc(sizeof(*otype), GFP_KERNEL); 1947 if (!otype) 1948 goto out; 1949 1950 /* length of the path component string */ 1951 rc = next_entry(buf, fp, sizeof(u32)); 1952 if (rc) 1953 goto out; 1954 len = le32_to_cpu(buf[0]); 1955 1956 /* path component string */ 1957 rc = str_read(&name, GFP_KERNEL, fp, len); 1958 if (rc) 1959 goto out; 1960 1961 ft->name = name; 1962 1963 rc = next_entry(buf, fp, sizeof(u32) * 4); 1964 if (rc) 1965 goto out; 1966 1967 ft->stype = le32_to_cpu(buf[0]); 1968 ft->ttype = le32_to_cpu(buf[1]); 1969 ft->tclass = le32_to_cpu(buf[2]); 1970 1971 otype->otype = le32_to_cpu(buf[3]); 1972 1973 rc = ebitmap_set_bit(&p->filename_trans_ttypes, ft->ttype, 1); 1974 if (rc) 1975 goto out; 1976 1977 rc = hashtab_insert(p->filename_trans, ft, otype); 1978 if (rc) { 1979 /* 1980 * Do not return -EEXIST to the caller, or the system 1981 * will not boot. 1982 */ 1983 if (rc != -EEXIST) 1984 goto out; 1985 /* But free memory to avoid memory leak. */ 1986 kfree(ft); 1987 kfree(name); 1988 kfree(otype); 1989 } 1990 } 1991 hash_eval(p->filename_trans, "filenametr"); 1992 return 0; 1993 out: 1994 kfree(ft); 1995 kfree(name); 1996 kfree(otype); 1997 1998 return rc; 1999 } 2000 2001 static int genfs_read(struct policydb *p, void *fp) 2002 { 2003 int i, j, rc; 2004 u32 nel, nel2, len, len2; 2005 __le32 buf[1]; 2006 struct ocontext *l, *c; 2007 struct ocontext *newc = NULL; 2008 struct genfs *genfs_p, *genfs; 2009 struct genfs *newgenfs = NULL; 2010 2011 rc = next_entry(buf, fp, sizeof(u32)); 2012 if (rc) 2013 return rc; 2014 nel = le32_to_cpu(buf[0]); 2015 2016 for (i = 0; i < nel; i++) { 2017 rc = next_entry(buf, fp, sizeof(u32)); 2018 if (rc) 2019 goto out; 2020 len = le32_to_cpu(buf[0]); 2021 2022 rc = -ENOMEM; 2023 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL); 2024 if (!newgenfs) 2025 goto out; 2026 2027 rc = str_read(&newgenfs->fstype, GFP_KERNEL, fp, len); 2028 if (rc) 2029 goto out; 2030 2031 for (genfs_p = NULL, genfs = p->genfs; genfs; 2032 genfs_p = genfs, genfs = genfs->next) { 2033 rc = -EINVAL; 2034 if (strcmp(newgenfs->fstype, genfs->fstype) == 0) { 2035 pr_err("SELinux: dup genfs fstype %s\n", 2036 newgenfs->fstype); 2037 goto out; 2038 } 2039 if (strcmp(newgenfs->fstype, genfs->fstype) < 0) 2040 break; 2041 } 2042 newgenfs->next = genfs; 2043 if (genfs_p) 2044 genfs_p->next = newgenfs; 2045 else 2046 p->genfs = newgenfs; 2047 genfs = newgenfs; 2048 newgenfs = NULL; 2049 2050 rc = next_entry(buf, fp, sizeof(u32)); 2051 if (rc) 2052 goto out; 2053 2054 nel2 = le32_to_cpu(buf[0]); 2055 for (j = 0; j < nel2; j++) { 2056 rc = next_entry(buf, fp, sizeof(u32)); 2057 if (rc) 2058 goto out; 2059 len = le32_to_cpu(buf[0]); 2060 2061 rc = -ENOMEM; 2062 newc = kzalloc(sizeof(*newc), GFP_KERNEL); 2063 if (!newc) 2064 goto out; 2065 2066 rc = str_read(&newc->u.name, GFP_KERNEL, fp, len); 2067 if (rc) 2068 goto out; 2069 2070 rc = next_entry(buf, fp, sizeof(u32)); 2071 if (rc) 2072 goto out; 2073 2074 newc->v.sclass = le32_to_cpu(buf[0]); 2075 rc = context_read_and_validate(&newc->context[0], p, fp); 2076 if (rc) 2077 goto out; 2078 2079 for (l = NULL, c = genfs->head; c; 2080 l = c, c = c->next) { 2081 rc = -EINVAL; 2082 if (!strcmp(newc->u.name, c->u.name) && 2083 (!c->v.sclass || !newc->v.sclass || 2084 newc->v.sclass == c->v.sclass)) { 2085 pr_err("SELinux: dup genfs entry (%s,%s)\n", 2086 genfs->fstype, c->u.name); 2087 goto out; 2088 } 2089 len = strlen(newc->u.name); 2090 len2 = strlen(c->u.name); 2091 if (len > len2) 2092 break; 2093 } 2094 2095 newc->next = c; 2096 if (l) 2097 l->next = newc; 2098 else 2099 genfs->head = newc; 2100 newc = NULL; 2101 } 2102 } 2103 rc = 0; 2104 out: 2105 if (newgenfs) { 2106 kfree(newgenfs->fstype); 2107 kfree(newgenfs); 2108 } 2109 ocontext_destroy(newc, OCON_FSUSE); 2110 2111 return rc; 2112 } 2113 2114 static int ocontext_read(struct policydb *p, struct policydb_compat_info *info, 2115 void *fp) 2116 { 2117 int i, j, rc; 2118 u32 nel, len; 2119 __be64 prefixbuf[1]; 2120 __le32 buf[3]; 2121 struct ocontext *l, *c; 2122 u32 nodebuf[8]; 2123 2124 for (i = 0; i < info->ocon_num; i++) { 2125 rc = next_entry(buf, fp, sizeof(u32)); 2126 if (rc) 2127 goto out; 2128 nel = le32_to_cpu(buf[0]); 2129 2130 l = NULL; 2131 for (j = 0; j < nel; j++) { 2132 rc = -ENOMEM; 2133 c = kzalloc(sizeof(*c), GFP_KERNEL); 2134 if (!c) 2135 goto out; 2136 if (l) 2137 l->next = c; 2138 else 2139 p->ocontexts[i] = c; 2140 l = c; 2141 2142 switch (i) { 2143 case OCON_ISID: 2144 rc = next_entry(buf, fp, sizeof(u32)); 2145 if (rc) 2146 goto out; 2147 2148 c->sid[0] = le32_to_cpu(buf[0]); 2149 rc = context_read_and_validate(&c->context[0], p, fp); 2150 if (rc) 2151 goto out; 2152 break; 2153 case OCON_FS: 2154 case OCON_NETIF: 2155 rc = next_entry(buf, fp, sizeof(u32)); 2156 if (rc) 2157 goto out; 2158 len = le32_to_cpu(buf[0]); 2159 2160 rc = str_read(&c->u.name, GFP_KERNEL, fp, len); 2161 if (rc) 2162 goto out; 2163 2164 rc = context_read_and_validate(&c->context[0], p, fp); 2165 if (rc) 2166 goto out; 2167 rc = context_read_and_validate(&c->context[1], p, fp); 2168 if (rc) 2169 goto out; 2170 break; 2171 case OCON_PORT: 2172 rc = next_entry(buf, fp, sizeof(u32)*3); 2173 if (rc) 2174 goto out; 2175 c->u.port.protocol = le32_to_cpu(buf[0]); 2176 c->u.port.low_port = le32_to_cpu(buf[1]); 2177 c->u.port.high_port = le32_to_cpu(buf[2]); 2178 rc = context_read_and_validate(&c->context[0], p, fp); 2179 if (rc) 2180 goto out; 2181 break; 2182 case OCON_NODE: 2183 rc = next_entry(nodebuf, fp, sizeof(u32) * 2); 2184 if (rc) 2185 goto out; 2186 c->u.node.addr = nodebuf[0]; /* network order */ 2187 c->u.node.mask = nodebuf[1]; /* network order */ 2188 rc = context_read_and_validate(&c->context[0], p, fp); 2189 if (rc) 2190 goto out; 2191 break; 2192 case OCON_FSUSE: 2193 rc = next_entry(buf, fp, sizeof(u32)*2); 2194 if (rc) 2195 goto out; 2196 2197 rc = -EINVAL; 2198 c->v.behavior = le32_to_cpu(buf[0]); 2199 /* Determined at runtime, not in policy DB. */ 2200 if (c->v.behavior == SECURITY_FS_USE_MNTPOINT) 2201 goto out; 2202 if (c->v.behavior > SECURITY_FS_USE_MAX) 2203 goto out; 2204 2205 len = le32_to_cpu(buf[1]); 2206 rc = str_read(&c->u.name, GFP_KERNEL, fp, len); 2207 if (rc) 2208 goto out; 2209 2210 rc = context_read_and_validate(&c->context[0], p, fp); 2211 if (rc) 2212 goto out; 2213 break; 2214 case OCON_NODE6: { 2215 int k; 2216 2217 rc = next_entry(nodebuf, fp, sizeof(u32) * 8); 2218 if (rc) 2219 goto out; 2220 for (k = 0; k < 4; k++) 2221 c->u.node6.addr[k] = nodebuf[k]; 2222 for (k = 0; k < 4; k++) 2223 c->u.node6.mask[k] = nodebuf[k+4]; 2224 rc = context_read_and_validate(&c->context[0], p, fp); 2225 if (rc) 2226 goto out; 2227 break; 2228 } 2229 case OCON_IBPKEY: { 2230 u32 pkey_lo, pkey_hi; 2231 2232 rc = next_entry(prefixbuf, fp, sizeof(u64)); 2233 if (rc) 2234 goto out; 2235 2236 /* we need to have subnet_prefix in CPU order */ 2237 c->u.ibpkey.subnet_prefix = be64_to_cpu(prefixbuf[0]); 2238 2239 rc = next_entry(buf, fp, sizeof(u32) * 2); 2240 if (rc) 2241 goto out; 2242 2243 pkey_lo = le32_to_cpu(buf[0]); 2244 pkey_hi = le32_to_cpu(buf[1]); 2245 2246 if (pkey_lo > U16_MAX || pkey_hi > U16_MAX) { 2247 rc = -EINVAL; 2248 goto out; 2249 } 2250 2251 c->u.ibpkey.low_pkey = pkey_lo; 2252 c->u.ibpkey.high_pkey = pkey_hi; 2253 2254 rc = context_read_and_validate(&c->context[0], 2255 p, 2256 fp); 2257 if (rc) 2258 goto out; 2259 break; 2260 } 2261 case OCON_IBENDPORT: { 2262 u32 port; 2263 2264 rc = next_entry(buf, fp, sizeof(u32) * 2); 2265 if (rc) 2266 goto out; 2267 len = le32_to_cpu(buf[0]); 2268 2269 rc = str_read(&c->u.ibendport.dev_name, GFP_KERNEL, fp, len); 2270 if (rc) 2271 goto out; 2272 2273 port = le32_to_cpu(buf[1]); 2274 if (port > U8_MAX || port == 0) { 2275 rc = -EINVAL; 2276 goto out; 2277 } 2278 2279 c->u.ibendport.port = port; 2280 2281 rc = context_read_and_validate(&c->context[0], 2282 p, 2283 fp); 2284 if (rc) 2285 goto out; 2286 break; 2287 } /* end case */ 2288 } /* end switch */ 2289 } 2290 } 2291 rc = 0; 2292 out: 2293 return rc; 2294 } 2295 2296 /* 2297 * Read the configuration data from a policy database binary 2298 * representation file into a policy database structure. 2299 */ 2300 int policydb_read(struct policydb *p, void *fp) 2301 { 2302 struct role_allow *ra, *lra; 2303 struct role_trans *tr, *ltr; 2304 int i, j, rc; 2305 __le32 buf[4]; 2306 u32 len, nprim, nel; 2307 2308 char *policydb_str; 2309 struct policydb_compat_info *info; 2310 2311 rc = policydb_init(p); 2312 if (rc) 2313 return rc; 2314 2315 /* Read the magic number and string length. */ 2316 rc = next_entry(buf, fp, sizeof(u32) * 2); 2317 if (rc) 2318 goto bad; 2319 2320 rc = -EINVAL; 2321 if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) { 2322 pr_err("SELinux: policydb magic number 0x%x does " 2323 "not match expected magic number 0x%x\n", 2324 le32_to_cpu(buf[0]), POLICYDB_MAGIC); 2325 goto bad; 2326 } 2327 2328 rc = -EINVAL; 2329 len = le32_to_cpu(buf[1]); 2330 if (len != strlen(POLICYDB_STRING)) { 2331 pr_err("SELinux: policydb string length %d does not " 2332 "match expected length %zu\n", 2333 len, strlen(POLICYDB_STRING)); 2334 goto bad; 2335 } 2336 2337 rc = -ENOMEM; 2338 policydb_str = kmalloc(len + 1, GFP_KERNEL); 2339 if (!policydb_str) { 2340 pr_err("SELinux: unable to allocate memory for policydb " 2341 "string of length %d\n", len); 2342 goto bad; 2343 } 2344 2345 rc = next_entry(policydb_str, fp, len); 2346 if (rc) { 2347 pr_err("SELinux: truncated policydb string identifier\n"); 2348 kfree(policydb_str); 2349 goto bad; 2350 } 2351 2352 rc = -EINVAL; 2353 policydb_str[len] = '\0'; 2354 if (strcmp(policydb_str, POLICYDB_STRING)) { 2355 pr_err("SELinux: policydb string %s does not match " 2356 "my string %s\n", policydb_str, POLICYDB_STRING); 2357 kfree(policydb_str); 2358 goto bad; 2359 } 2360 /* Done with policydb_str. */ 2361 kfree(policydb_str); 2362 policydb_str = NULL; 2363 2364 /* Read the version and table sizes. */ 2365 rc = next_entry(buf, fp, sizeof(u32)*4); 2366 if (rc) 2367 goto bad; 2368 2369 rc = -EINVAL; 2370 p->policyvers = le32_to_cpu(buf[0]); 2371 if (p->policyvers < POLICYDB_VERSION_MIN || 2372 p->policyvers > POLICYDB_VERSION_MAX) { 2373 pr_err("SELinux: policydb version %d does not match " 2374 "my version range %d-%d\n", 2375 le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX); 2376 goto bad; 2377 } 2378 2379 if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) { 2380 p->mls_enabled = 1; 2381 2382 rc = -EINVAL; 2383 if (p->policyvers < POLICYDB_VERSION_MLS) { 2384 pr_err("SELinux: security policydb version %d " 2385 "(MLS) not backwards compatible\n", 2386 p->policyvers); 2387 goto bad; 2388 } 2389 } 2390 p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN); 2391 p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN); 2392 2393 if (p->policyvers >= POLICYDB_VERSION_POLCAP) { 2394 rc = ebitmap_read(&p->policycaps, fp); 2395 if (rc) 2396 goto bad; 2397 } 2398 2399 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) { 2400 rc = ebitmap_read(&p->permissive_map, fp); 2401 if (rc) 2402 goto bad; 2403 } 2404 2405 rc = -EINVAL; 2406 info = policydb_lookup_compat(p->policyvers); 2407 if (!info) { 2408 pr_err("SELinux: unable to find policy compat info " 2409 "for version %d\n", p->policyvers); 2410 goto bad; 2411 } 2412 2413 rc = -EINVAL; 2414 if (le32_to_cpu(buf[2]) != info->sym_num || 2415 le32_to_cpu(buf[3]) != info->ocon_num) { 2416 pr_err("SELinux: policydb table sizes (%d,%d) do " 2417 "not match mine (%d,%d)\n", le32_to_cpu(buf[2]), 2418 le32_to_cpu(buf[3]), 2419 info->sym_num, info->ocon_num); 2420 goto bad; 2421 } 2422 2423 for (i = 0; i < info->sym_num; i++) { 2424 rc = next_entry(buf, fp, sizeof(u32)*2); 2425 if (rc) 2426 goto bad; 2427 nprim = le32_to_cpu(buf[0]); 2428 nel = le32_to_cpu(buf[1]); 2429 for (j = 0; j < nel; j++) { 2430 rc = read_f[i](p, p->symtab[i].table, fp); 2431 if (rc) 2432 goto bad; 2433 } 2434 2435 p->symtab[i].nprim = nprim; 2436 } 2437 2438 rc = -EINVAL; 2439 p->process_class = string_to_security_class(p, "process"); 2440 if (!p->process_class) 2441 goto bad; 2442 2443 rc = avtab_read(&p->te_avtab, fp, p); 2444 if (rc) 2445 goto bad; 2446 2447 if (p->policyvers >= POLICYDB_VERSION_BOOL) { 2448 rc = cond_read_list(p, fp); 2449 if (rc) 2450 goto bad; 2451 } 2452 2453 rc = next_entry(buf, fp, sizeof(u32)); 2454 if (rc) 2455 goto bad; 2456 nel = le32_to_cpu(buf[0]); 2457 ltr = NULL; 2458 for (i = 0; i < nel; i++) { 2459 rc = -ENOMEM; 2460 tr = kzalloc(sizeof(*tr), GFP_KERNEL); 2461 if (!tr) 2462 goto bad; 2463 if (ltr) 2464 ltr->next = tr; 2465 else 2466 p->role_tr = tr; 2467 rc = next_entry(buf, fp, sizeof(u32)*3); 2468 if (rc) 2469 goto bad; 2470 2471 rc = -EINVAL; 2472 tr->role = le32_to_cpu(buf[0]); 2473 tr->type = le32_to_cpu(buf[1]); 2474 tr->new_role = le32_to_cpu(buf[2]); 2475 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) { 2476 rc = next_entry(buf, fp, sizeof(u32)); 2477 if (rc) 2478 goto bad; 2479 tr->tclass = le32_to_cpu(buf[0]); 2480 } else 2481 tr->tclass = p->process_class; 2482 2483 rc = -EINVAL; 2484 if (!policydb_role_isvalid(p, tr->role) || 2485 !policydb_type_isvalid(p, tr->type) || 2486 !policydb_class_isvalid(p, tr->tclass) || 2487 !policydb_role_isvalid(p, tr->new_role)) 2488 goto bad; 2489 ltr = tr; 2490 } 2491 2492 rc = next_entry(buf, fp, sizeof(u32)); 2493 if (rc) 2494 goto bad; 2495 nel = le32_to_cpu(buf[0]); 2496 lra = NULL; 2497 for (i = 0; i < nel; i++) { 2498 rc = -ENOMEM; 2499 ra = kzalloc(sizeof(*ra), GFP_KERNEL); 2500 if (!ra) 2501 goto bad; 2502 if (lra) 2503 lra->next = ra; 2504 else 2505 p->role_allow = ra; 2506 rc = next_entry(buf, fp, sizeof(u32)*2); 2507 if (rc) 2508 goto bad; 2509 2510 rc = -EINVAL; 2511 ra->role = le32_to_cpu(buf[0]); 2512 ra->new_role = le32_to_cpu(buf[1]); 2513 if (!policydb_role_isvalid(p, ra->role) || 2514 !policydb_role_isvalid(p, ra->new_role)) 2515 goto bad; 2516 lra = ra; 2517 } 2518 2519 rc = filename_trans_read(p, fp); 2520 if (rc) 2521 goto bad; 2522 2523 rc = policydb_index(p); 2524 if (rc) 2525 goto bad; 2526 2527 rc = -EINVAL; 2528 p->process_trans_perms = string_to_av_perm(p, p->process_class, "transition"); 2529 p->process_trans_perms |= string_to_av_perm(p, p->process_class, "dyntransition"); 2530 if (!p->process_trans_perms) 2531 goto bad; 2532 2533 rc = ocontext_read(p, info, fp); 2534 if (rc) 2535 goto bad; 2536 2537 rc = genfs_read(p, fp); 2538 if (rc) 2539 goto bad; 2540 2541 rc = range_read(p, fp); 2542 if (rc) 2543 goto bad; 2544 2545 rc = -ENOMEM; 2546 p->type_attr_map_array = flex_array_alloc(sizeof(struct ebitmap), 2547 p->p_types.nprim, 2548 GFP_KERNEL | __GFP_ZERO); 2549 if (!p->type_attr_map_array) 2550 goto bad; 2551 2552 /* preallocate so we don't have to worry about the put ever failing */ 2553 rc = flex_array_prealloc(p->type_attr_map_array, 0, p->p_types.nprim, 2554 GFP_KERNEL | __GFP_ZERO); 2555 if (rc) 2556 goto bad; 2557 2558 for (i = 0; i < p->p_types.nprim; i++) { 2559 struct ebitmap *e = flex_array_get(p->type_attr_map_array, i); 2560 2561 BUG_ON(!e); 2562 ebitmap_init(e); 2563 if (p->policyvers >= POLICYDB_VERSION_AVTAB) { 2564 rc = ebitmap_read(e, fp); 2565 if (rc) 2566 goto bad; 2567 } 2568 /* add the type itself as the degenerate case */ 2569 rc = ebitmap_set_bit(e, i, 1); 2570 if (rc) 2571 goto bad; 2572 } 2573 2574 rc = policydb_bounds_sanity_check(p); 2575 if (rc) 2576 goto bad; 2577 2578 rc = 0; 2579 out: 2580 return rc; 2581 bad: 2582 policydb_destroy(p); 2583 goto out; 2584 } 2585 2586 /* 2587 * Write a MLS level structure to a policydb binary 2588 * representation file. 2589 */ 2590 static int mls_write_level(struct mls_level *l, void *fp) 2591 { 2592 __le32 buf[1]; 2593 int rc; 2594 2595 buf[0] = cpu_to_le32(l->sens); 2596 rc = put_entry(buf, sizeof(u32), 1, fp); 2597 if (rc) 2598 return rc; 2599 2600 rc = ebitmap_write(&l->cat, fp); 2601 if (rc) 2602 return rc; 2603 2604 return 0; 2605 } 2606 2607 /* 2608 * Write a MLS range structure to a policydb binary 2609 * representation file. 2610 */ 2611 static int mls_write_range_helper(struct mls_range *r, void *fp) 2612 { 2613 __le32 buf[3]; 2614 size_t items; 2615 int rc, eq; 2616 2617 eq = mls_level_eq(&r->level[1], &r->level[0]); 2618 2619 if (eq) 2620 items = 2; 2621 else 2622 items = 3; 2623 buf[0] = cpu_to_le32(items-1); 2624 buf[1] = cpu_to_le32(r->level[0].sens); 2625 if (!eq) 2626 buf[2] = cpu_to_le32(r->level[1].sens); 2627 2628 BUG_ON(items > ARRAY_SIZE(buf)); 2629 2630 rc = put_entry(buf, sizeof(u32), items, fp); 2631 if (rc) 2632 return rc; 2633 2634 rc = ebitmap_write(&r->level[0].cat, fp); 2635 if (rc) 2636 return rc; 2637 if (!eq) { 2638 rc = ebitmap_write(&r->level[1].cat, fp); 2639 if (rc) 2640 return rc; 2641 } 2642 2643 return 0; 2644 } 2645 2646 static int sens_write(void *vkey, void *datum, void *ptr) 2647 { 2648 char *key = vkey; 2649 struct level_datum *levdatum = datum; 2650 struct policy_data *pd = ptr; 2651 void *fp = pd->fp; 2652 __le32 buf[2]; 2653 size_t len; 2654 int rc; 2655 2656 len = strlen(key); 2657 buf[0] = cpu_to_le32(len); 2658 buf[1] = cpu_to_le32(levdatum->isalias); 2659 rc = put_entry(buf, sizeof(u32), 2, fp); 2660 if (rc) 2661 return rc; 2662 2663 rc = put_entry(key, 1, len, fp); 2664 if (rc) 2665 return rc; 2666 2667 rc = mls_write_level(levdatum->level, fp); 2668 if (rc) 2669 return rc; 2670 2671 return 0; 2672 } 2673 2674 static int cat_write(void *vkey, void *datum, void *ptr) 2675 { 2676 char *key = vkey; 2677 struct cat_datum *catdatum = datum; 2678 struct policy_data *pd = ptr; 2679 void *fp = pd->fp; 2680 __le32 buf[3]; 2681 size_t len; 2682 int rc; 2683 2684 len = strlen(key); 2685 buf[0] = cpu_to_le32(len); 2686 buf[1] = cpu_to_le32(catdatum->value); 2687 buf[2] = cpu_to_le32(catdatum->isalias); 2688 rc = put_entry(buf, sizeof(u32), 3, fp); 2689 if (rc) 2690 return rc; 2691 2692 rc = put_entry(key, 1, len, fp); 2693 if (rc) 2694 return rc; 2695 2696 return 0; 2697 } 2698 2699 static int role_trans_write(struct policydb *p, void *fp) 2700 { 2701 struct role_trans *r = p->role_tr; 2702 struct role_trans *tr; 2703 u32 buf[3]; 2704 size_t nel; 2705 int rc; 2706 2707 nel = 0; 2708 for (tr = r; tr; tr = tr->next) 2709 nel++; 2710 buf[0] = cpu_to_le32(nel); 2711 rc = put_entry(buf, sizeof(u32), 1, fp); 2712 if (rc) 2713 return rc; 2714 for (tr = r; tr; tr = tr->next) { 2715 buf[0] = cpu_to_le32(tr->role); 2716 buf[1] = cpu_to_le32(tr->type); 2717 buf[2] = cpu_to_le32(tr->new_role); 2718 rc = put_entry(buf, sizeof(u32), 3, fp); 2719 if (rc) 2720 return rc; 2721 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) { 2722 buf[0] = cpu_to_le32(tr->tclass); 2723 rc = put_entry(buf, sizeof(u32), 1, fp); 2724 if (rc) 2725 return rc; 2726 } 2727 } 2728 2729 return 0; 2730 } 2731 2732 static int role_allow_write(struct role_allow *r, void *fp) 2733 { 2734 struct role_allow *ra; 2735 u32 buf[2]; 2736 size_t nel; 2737 int rc; 2738 2739 nel = 0; 2740 for (ra = r; ra; ra = ra->next) 2741 nel++; 2742 buf[0] = cpu_to_le32(nel); 2743 rc = put_entry(buf, sizeof(u32), 1, fp); 2744 if (rc) 2745 return rc; 2746 for (ra = r; ra; ra = ra->next) { 2747 buf[0] = cpu_to_le32(ra->role); 2748 buf[1] = cpu_to_le32(ra->new_role); 2749 rc = put_entry(buf, sizeof(u32), 2, fp); 2750 if (rc) 2751 return rc; 2752 } 2753 return 0; 2754 } 2755 2756 /* 2757 * Write a security context structure 2758 * to a policydb binary representation file. 2759 */ 2760 static int context_write(struct policydb *p, struct context *c, 2761 void *fp) 2762 { 2763 int rc; 2764 __le32 buf[3]; 2765 2766 buf[0] = cpu_to_le32(c->user); 2767 buf[1] = cpu_to_le32(c->role); 2768 buf[2] = cpu_to_le32(c->type); 2769 2770 rc = put_entry(buf, sizeof(u32), 3, fp); 2771 if (rc) 2772 return rc; 2773 2774 rc = mls_write_range_helper(&c->range, fp); 2775 if (rc) 2776 return rc; 2777 2778 return 0; 2779 } 2780 2781 /* 2782 * The following *_write functions are used to 2783 * write the symbol data to a policy database 2784 * binary representation file. 2785 */ 2786 2787 static int perm_write(void *vkey, void *datum, void *fp) 2788 { 2789 char *key = vkey; 2790 struct perm_datum *perdatum = datum; 2791 __le32 buf[2]; 2792 size_t len; 2793 int rc; 2794 2795 len = strlen(key); 2796 buf[0] = cpu_to_le32(len); 2797 buf[1] = cpu_to_le32(perdatum->value); 2798 rc = put_entry(buf, sizeof(u32), 2, fp); 2799 if (rc) 2800 return rc; 2801 2802 rc = put_entry(key, 1, len, fp); 2803 if (rc) 2804 return rc; 2805 2806 return 0; 2807 } 2808 2809 static int common_write(void *vkey, void *datum, void *ptr) 2810 { 2811 char *key = vkey; 2812 struct common_datum *comdatum = datum; 2813 struct policy_data *pd = ptr; 2814 void *fp = pd->fp; 2815 __le32 buf[4]; 2816 size_t len; 2817 int rc; 2818 2819 len = strlen(key); 2820 buf[0] = cpu_to_le32(len); 2821 buf[1] = cpu_to_le32(comdatum->value); 2822 buf[2] = cpu_to_le32(comdatum->permissions.nprim); 2823 buf[3] = cpu_to_le32(comdatum->permissions.table->nel); 2824 rc = put_entry(buf, sizeof(u32), 4, fp); 2825 if (rc) 2826 return rc; 2827 2828 rc = put_entry(key, 1, len, fp); 2829 if (rc) 2830 return rc; 2831 2832 rc = hashtab_map(comdatum->permissions.table, perm_write, fp); 2833 if (rc) 2834 return rc; 2835 2836 return 0; 2837 } 2838 2839 static int type_set_write(struct type_set *t, void *fp) 2840 { 2841 int rc; 2842 __le32 buf[1]; 2843 2844 if (ebitmap_write(&t->types, fp)) 2845 return -EINVAL; 2846 if (ebitmap_write(&t->negset, fp)) 2847 return -EINVAL; 2848 2849 buf[0] = cpu_to_le32(t->flags); 2850 rc = put_entry(buf, sizeof(u32), 1, fp); 2851 if (rc) 2852 return -EINVAL; 2853 2854 return 0; 2855 } 2856 2857 static int write_cons_helper(struct policydb *p, struct constraint_node *node, 2858 void *fp) 2859 { 2860 struct constraint_node *c; 2861 struct constraint_expr *e; 2862 __le32 buf[3]; 2863 u32 nel; 2864 int rc; 2865 2866 for (c = node; c; c = c->next) { 2867 nel = 0; 2868 for (e = c->expr; e; e = e->next) 2869 nel++; 2870 buf[0] = cpu_to_le32(c->permissions); 2871 buf[1] = cpu_to_le32(nel); 2872 rc = put_entry(buf, sizeof(u32), 2, fp); 2873 if (rc) 2874 return rc; 2875 for (e = c->expr; e; e = e->next) { 2876 buf[0] = cpu_to_le32(e->expr_type); 2877 buf[1] = cpu_to_le32(e->attr); 2878 buf[2] = cpu_to_le32(e->op); 2879 rc = put_entry(buf, sizeof(u32), 3, fp); 2880 if (rc) 2881 return rc; 2882 2883 switch (e->expr_type) { 2884 case CEXPR_NAMES: 2885 rc = ebitmap_write(&e->names, fp); 2886 if (rc) 2887 return rc; 2888 if (p->policyvers >= 2889 POLICYDB_VERSION_CONSTRAINT_NAMES) { 2890 rc = type_set_write(e->type_names, fp); 2891 if (rc) 2892 return rc; 2893 } 2894 break; 2895 default: 2896 break; 2897 } 2898 } 2899 } 2900 2901 return 0; 2902 } 2903 2904 static int class_write(void *vkey, void *datum, void *ptr) 2905 { 2906 char *key = vkey; 2907 struct class_datum *cladatum = datum; 2908 struct policy_data *pd = ptr; 2909 void *fp = pd->fp; 2910 struct policydb *p = pd->p; 2911 struct constraint_node *c; 2912 __le32 buf[6]; 2913 u32 ncons; 2914 size_t len, len2; 2915 int rc; 2916 2917 len = strlen(key); 2918 if (cladatum->comkey) 2919 len2 = strlen(cladatum->comkey); 2920 else 2921 len2 = 0; 2922 2923 ncons = 0; 2924 for (c = cladatum->constraints; c; c = c->next) 2925 ncons++; 2926 2927 buf[0] = cpu_to_le32(len); 2928 buf[1] = cpu_to_le32(len2); 2929 buf[2] = cpu_to_le32(cladatum->value); 2930 buf[3] = cpu_to_le32(cladatum->permissions.nprim); 2931 if (cladatum->permissions.table) 2932 buf[4] = cpu_to_le32(cladatum->permissions.table->nel); 2933 else 2934 buf[4] = 0; 2935 buf[5] = cpu_to_le32(ncons); 2936 rc = put_entry(buf, sizeof(u32), 6, fp); 2937 if (rc) 2938 return rc; 2939 2940 rc = put_entry(key, 1, len, fp); 2941 if (rc) 2942 return rc; 2943 2944 if (cladatum->comkey) { 2945 rc = put_entry(cladatum->comkey, 1, len2, fp); 2946 if (rc) 2947 return rc; 2948 } 2949 2950 rc = hashtab_map(cladatum->permissions.table, perm_write, fp); 2951 if (rc) 2952 return rc; 2953 2954 rc = write_cons_helper(p, cladatum->constraints, fp); 2955 if (rc) 2956 return rc; 2957 2958 /* write out the validatetrans rule */ 2959 ncons = 0; 2960 for (c = cladatum->validatetrans; c; c = c->next) 2961 ncons++; 2962 2963 buf[0] = cpu_to_le32(ncons); 2964 rc = put_entry(buf, sizeof(u32), 1, fp); 2965 if (rc) 2966 return rc; 2967 2968 rc = write_cons_helper(p, cladatum->validatetrans, fp); 2969 if (rc) 2970 return rc; 2971 2972 if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) { 2973 buf[0] = cpu_to_le32(cladatum->default_user); 2974 buf[1] = cpu_to_le32(cladatum->default_role); 2975 buf[2] = cpu_to_le32(cladatum->default_range); 2976 2977 rc = put_entry(buf, sizeof(uint32_t), 3, fp); 2978 if (rc) 2979 return rc; 2980 } 2981 2982 if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) { 2983 buf[0] = cpu_to_le32(cladatum->default_type); 2984 rc = put_entry(buf, sizeof(uint32_t), 1, fp); 2985 if (rc) 2986 return rc; 2987 } 2988 2989 return 0; 2990 } 2991 2992 static int role_write(void *vkey, void *datum, void *ptr) 2993 { 2994 char *key = vkey; 2995 struct role_datum *role = datum; 2996 struct policy_data *pd = ptr; 2997 void *fp = pd->fp; 2998 struct policydb *p = pd->p; 2999 __le32 buf[3]; 3000 size_t items, len; 3001 int rc; 3002 3003 len = strlen(key); 3004 items = 0; 3005 buf[items++] = cpu_to_le32(len); 3006 buf[items++] = cpu_to_le32(role->value); 3007 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) 3008 buf[items++] = cpu_to_le32(role->bounds); 3009 3010 BUG_ON(items > ARRAY_SIZE(buf)); 3011 3012 rc = put_entry(buf, sizeof(u32), items, fp); 3013 if (rc) 3014 return rc; 3015 3016 rc = put_entry(key, 1, len, fp); 3017 if (rc) 3018 return rc; 3019 3020 rc = ebitmap_write(&role->dominates, fp); 3021 if (rc) 3022 return rc; 3023 3024 rc = ebitmap_write(&role->types, fp); 3025 if (rc) 3026 return rc; 3027 3028 return 0; 3029 } 3030 3031 static int type_write(void *vkey, void *datum, void *ptr) 3032 { 3033 char *key = vkey; 3034 struct type_datum *typdatum = datum; 3035 struct policy_data *pd = ptr; 3036 struct policydb *p = pd->p; 3037 void *fp = pd->fp; 3038 __le32 buf[4]; 3039 int rc; 3040 size_t items, len; 3041 3042 len = strlen(key); 3043 items = 0; 3044 buf[items++] = cpu_to_le32(len); 3045 buf[items++] = cpu_to_le32(typdatum->value); 3046 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) { 3047 u32 properties = 0; 3048 3049 if (typdatum->primary) 3050 properties |= TYPEDATUM_PROPERTY_PRIMARY; 3051 3052 if (typdatum->attribute) 3053 properties |= TYPEDATUM_PROPERTY_ATTRIBUTE; 3054 3055 buf[items++] = cpu_to_le32(properties); 3056 buf[items++] = cpu_to_le32(typdatum->bounds); 3057 } else { 3058 buf[items++] = cpu_to_le32(typdatum->primary); 3059 } 3060 BUG_ON(items > ARRAY_SIZE(buf)); 3061 rc = put_entry(buf, sizeof(u32), items, fp); 3062 if (rc) 3063 return rc; 3064 3065 rc = put_entry(key, 1, len, fp); 3066 if (rc) 3067 return rc; 3068 3069 return 0; 3070 } 3071 3072 static int user_write(void *vkey, void *datum, void *ptr) 3073 { 3074 char *key = vkey; 3075 struct user_datum *usrdatum = datum; 3076 struct policy_data *pd = ptr; 3077 struct policydb *p = pd->p; 3078 void *fp = pd->fp; 3079 __le32 buf[3]; 3080 size_t items, len; 3081 int rc; 3082 3083 len = strlen(key); 3084 items = 0; 3085 buf[items++] = cpu_to_le32(len); 3086 buf[items++] = cpu_to_le32(usrdatum->value); 3087 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) 3088 buf[items++] = cpu_to_le32(usrdatum->bounds); 3089 BUG_ON(items > ARRAY_SIZE(buf)); 3090 rc = put_entry(buf, sizeof(u32), items, fp); 3091 if (rc) 3092 return rc; 3093 3094 rc = put_entry(key, 1, len, fp); 3095 if (rc) 3096 return rc; 3097 3098 rc = ebitmap_write(&usrdatum->roles, fp); 3099 if (rc) 3100 return rc; 3101 3102 rc = mls_write_range_helper(&usrdatum->range, fp); 3103 if (rc) 3104 return rc; 3105 3106 rc = mls_write_level(&usrdatum->dfltlevel, fp); 3107 if (rc) 3108 return rc; 3109 3110 return 0; 3111 } 3112 3113 static int (*write_f[SYM_NUM]) (void *key, void *datum, 3114 void *datap) = 3115 { 3116 common_write, 3117 class_write, 3118 role_write, 3119 type_write, 3120 user_write, 3121 cond_write_bool, 3122 sens_write, 3123 cat_write, 3124 }; 3125 3126 static int ocontext_write(struct policydb *p, struct policydb_compat_info *info, 3127 void *fp) 3128 { 3129 unsigned int i, j, rc; 3130 size_t nel, len; 3131 __be64 prefixbuf[1]; 3132 __le32 buf[3]; 3133 u32 nodebuf[8]; 3134 struct ocontext *c; 3135 for (i = 0; i < info->ocon_num; i++) { 3136 nel = 0; 3137 for (c = p->ocontexts[i]; c; c = c->next) 3138 nel++; 3139 buf[0] = cpu_to_le32(nel); 3140 rc = put_entry(buf, sizeof(u32), 1, fp); 3141 if (rc) 3142 return rc; 3143 for (c = p->ocontexts[i]; c; c = c->next) { 3144 switch (i) { 3145 case OCON_ISID: 3146 buf[0] = cpu_to_le32(c->sid[0]); 3147 rc = put_entry(buf, sizeof(u32), 1, fp); 3148 if (rc) 3149 return rc; 3150 rc = context_write(p, &c->context[0], fp); 3151 if (rc) 3152 return rc; 3153 break; 3154 case OCON_FS: 3155 case OCON_NETIF: 3156 len = strlen(c->u.name); 3157 buf[0] = cpu_to_le32(len); 3158 rc = put_entry(buf, sizeof(u32), 1, fp); 3159 if (rc) 3160 return rc; 3161 rc = put_entry(c->u.name, 1, len, fp); 3162 if (rc) 3163 return rc; 3164 rc = context_write(p, &c->context[0], fp); 3165 if (rc) 3166 return rc; 3167 rc = context_write(p, &c->context[1], fp); 3168 if (rc) 3169 return rc; 3170 break; 3171 case OCON_PORT: 3172 buf[0] = cpu_to_le32(c->u.port.protocol); 3173 buf[1] = cpu_to_le32(c->u.port.low_port); 3174 buf[2] = cpu_to_le32(c->u.port.high_port); 3175 rc = put_entry(buf, sizeof(u32), 3, fp); 3176 if (rc) 3177 return rc; 3178 rc = context_write(p, &c->context[0], fp); 3179 if (rc) 3180 return rc; 3181 break; 3182 case OCON_NODE: 3183 nodebuf[0] = c->u.node.addr; /* network order */ 3184 nodebuf[1] = c->u.node.mask; /* network order */ 3185 rc = put_entry(nodebuf, sizeof(u32), 2, fp); 3186 if (rc) 3187 return rc; 3188 rc = context_write(p, &c->context[0], fp); 3189 if (rc) 3190 return rc; 3191 break; 3192 case OCON_FSUSE: 3193 buf[0] = cpu_to_le32(c->v.behavior); 3194 len = strlen(c->u.name); 3195 buf[1] = cpu_to_le32(len); 3196 rc = put_entry(buf, sizeof(u32), 2, fp); 3197 if (rc) 3198 return rc; 3199 rc = put_entry(c->u.name, 1, len, fp); 3200 if (rc) 3201 return rc; 3202 rc = context_write(p, &c->context[0], fp); 3203 if (rc) 3204 return rc; 3205 break; 3206 case OCON_NODE6: 3207 for (j = 0; j < 4; j++) 3208 nodebuf[j] = c->u.node6.addr[j]; /* network order */ 3209 for (j = 0; j < 4; j++) 3210 nodebuf[j + 4] = c->u.node6.mask[j]; /* network order */ 3211 rc = put_entry(nodebuf, sizeof(u32), 8, fp); 3212 if (rc) 3213 return rc; 3214 rc = context_write(p, &c->context[0], fp); 3215 if (rc) 3216 return rc; 3217 break; 3218 case OCON_IBPKEY: 3219 /* subnet_prefix is in CPU order */ 3220 prefixbuf[0] = cpu_to_be64(c->u.ibpkey.subnet_prefix); 3221 3222 rc = put_entry(prefixbuf, sizeof(u64), 1, fp); 3223 if (rc) 3224 return rc; 3225 3226 buf[0] = cpu_to_le32(c->u.ibpkey.low_pkey); 3227 buf[1] = cpu_to_le32(c->u.ibpkey.high_pkey); 3228 3229 rc = put_entry(buf, sizeof(u32), 2, fp); 3230 if (rc) 3231 return rc; 3232 rc = context_write(p, &c->context[0], fp); 3233 if (rc) 3234 return rc; 3235 break; 3236 case OCON_IBENDPORT: 3237 len = strlen(c->u.ibendport.dev_name); 3238 buf[0] = cpu_to_le32(len); 3239 buf[1] = cpu_to_le32(c->u.ibendport.port); 3240 rc = put_entry(buf, sizeof(u32), 2, fp); 3241 if (rc) 3242 return rc; 3243 rc = put_entry(c->u.ibendport.dev_name, 1, len, fp); 3244 if (rc) 3245 return rc; 3246 rc = context_write(p, &c->context[0], fp); 3247 if (rc) 3248 return rc; 3249 break; 3250 } 3251 } 3252 } 3253 return 0; 3254 } 3255 3256 static int genfs_write(struct policydb *p, void *fp) 3257 { 3258 struct genfs *genfs; 3259 struct ocontext *c; 3260 size_t len; 3261 __le32 buf[1]; 3262 int rc; 3263 3264 len = 0; 3265 for (genfs = p->genfs; genfs; genfs = genfs->next) 3266 len++; 3267 buf[0] = cpu_to_le32(len); 3268 rc = put_entry(buf, sizeof(u32), 1, fp); 3269 if (rc) 3270 return rc; 3271 for (genfs = p->genfs; genfs; genfs = genfs->next) { 3272 len = strlen(genfs->fstype); 3273 buf[0] = cpu_to_le32(len); 3274 rc = put_entry(buf, sizeof(u32), 1, fp); 3275 if (rc) 3276 return rc; 3277 rc = put_entry(genfs->fstype, 1, len, fp); 3278 if (rc) 3279 return rc; 3280 len = 0; 3281 for (c = genfs->head; c; c = c->next) 3282 len++; 3283 buf[0] = cpu_to_le32(len); 3284 rc = put_entry(buf, sizeof(u32), 1, fp); 3285 if (rc) 3286 return rc; 3287 for (c = genfs->head; c; c = c->next) { 3288 len = strlen(c->u.name); 3289 buf[0] = cpu_to_le32(len); 3290 rc = put_entry(buf, sizeof(u32), 1, fp); 3291 if (rc) 3292 return rc; 3293 rc = put_entry(c->u.name, 1, len, fp); 3294 if (rc) 3295 return rc; 3296 buf[0] = cpu_to_le32(c->v.sclass); 3297 rc = put_entry(buf, sizeof(u32), 1, fp); 3298 if (rc) 3299 return rc; 3300 rc = context_write(p, &c->context[0], fp); 3301 if (rc) 3302 return rc; 3303 } 3304 } 3305 return 0; 3306 } 3307 3308 static int hashtab_cnt(void *key, void *data, void *ptr) 3309 { 3310 int *cnt = ptr; 3311 *cnt = *cnt + 1; 3312 3313 return 0; 3314 } 3315 3316 static int range_write_helper(void *key, void *data, void *ptr) 3317 { 3318 __le32 buf[2]; 3319 struct range_trans *rt = key; 3320 struct mls_range *r = data; 3321 struct policy_data *pd = ptr; 3322 void *fp = pd->fp; 3323 struct policydb *p = pd->p; 3324 int rc; 3325 3326 buf[0] = cpu_to_le32(rt->source_type); 3327 buf[1] = cpu_to_le32(rt->target_type); 3328 rc = put_entry(buf, sizeof(u32), 2, fp); 3329 if (rc) 3330 return rc; 3331 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) { 3332 buf[0] = cpu_to_le32(rt->target_class); 3333 rc = put_entry(buf, sizeof(u32), 1, fp); 3334 if (rc) 3335 return rc; 3336 } 3337 rc = mls_write_range_helper(r, fp); 3338 if (rc) 3339 return rc; 3340 3341 return 0; 3342 } 3343 3344 static int range_write(struct policydb *p, void *fp) 3345 { 3346 __le32 buf[1]; 3347 int rc, nel; 3348 struct policy_data pd; 3349 3350 pd.p = p; 3351 pd.fp = fp; 3352 3353 /* count the number of entries in the hashtab */ 3354 nel = 0; 3355 rc = hashtab_map(p->range_tr, hashtab_cnt, &nel); 3356 if (rc) 3357 return rc; 3358 3359 buf[0] = cpu_to_le32(nel); 3360 rc = put_entry(buf, sizeof(u32), 1, fp); 3361 if (rc) 3362 return rc; 3363 3364 /* actually write all of the entries */ 3365 rc = hashtab_map(p->range_tr, range_write_helper, &pd); 3366 if (rc) 3367 return rc; 3368 3369 return 0; 3370 } 3371 3372 static int filename_write_helper(void *key, void *data, void *ptr) 3373 { 3374 __le32 buf[4]; 3375 struct filename_trans *ft = key; 3376 struct filename_trans_datum *otype = data; 3377 void *fp = ptr; 3378 int rc; 3379 u32 len; 3380 3381 len = strlen(ft->name); 3382 buf[0] = cpu_to_le32(len); 3383 rc = put_entry(buf, sizeof(u32), 1, fp); 3384 if (rc) 3385 return rc; 3386 3387 rc = put_entry(ft->name, sizeof(char), len, fp); 3388 if (rc) 3389 return rc; 3390 3391 buf[0] = cpu_to_le32(ft->stype); 3392 buf[1] = cpu_to_le32(ft->ttype); 3393 buf[2] = cpu_to_le32(ft->tclass); 3394 buf[3] = cpu_to_le32(otype->otype); 3395 3396 rc = put_entry(buf, sizeof(u32), 4, fp); 3397 if (rc) 3398 return rc; 3399 3400 return 0; 3401 } 3402 3403 static int filename_trans_write(struct policydb *p, void *fp) 3404 { 3405 u32 nel; 3406 __le32 buf[1]; 3407 int rc; 3408 3409 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS) 3410 return 0; 3411 3412 nel = 0; 3413 rc = hashtab_map(p->filename_trans, hashtab_cnt, &nel); 3414 if (rc) 3415 return rc; 3416 3417 buf[0] = cpu_to_le32(nel); 3418 rc = put_entry(buf, sizeof(u32), 1, fp); 3419 if (rc) 3420 return rc; 3421 3422 rc = hashtab_map(p->filename_trans, filename_write_helper, fp); 3423 if (rc) 3424 return rc; 3425 3426 return 0; 3427 } 3428 3429 /* 3430 * Write the configuration data in a policy database 3431 * structure to a policy database binary representation 3432 * file. 3433 */ 3434 int policydb_write(struct policydb *p, void *fp) 3435 { 3436 unsigned int i, num_syms; 3437 int rc; 3438 __le32 buf[4]; 3439 u32 config; 3440 size_t len; 3441 struct policydb_compat_info *info; 3442 3443 /* 3444 * refuse to write policy older than compressed avtab 3445 * to simplify the writer. There are other tests dropped 3446 * since we assume this throughout the writer code. Be 3447 * careful if you ever try to remove this restriction 3448 */ 3449 if (p->policyvers < POLICYDB_VERSION_AVTAB) { 3450 pr_err("SELinux: refusing to write policy version %d." 3451 " Because it is less than version %d\n", p->policyvers, 3452 POLICYDB_VERSION_AVTAB); 3453 return -EINVAL; 3454 } 3455 3456 config = 0; 3457 if (p->mls_enabled) 3458 config |= POLICYDB_CONFIG_MLS; 3459 3460 if (p->reject_unknown) 3461 config |= REJECT_UNKNOWN; 3462 if (p->allow_unknown) 3463 config |= ALLOW_UNKNOWN; 3464 3465 /* Write the magic number and string identifiers. */ 3466 buf[0] = cpu_to_le32(POLICYDB_MAGIC); 3467 len = strlen(POLICYDB_STRING); 3468 buf[1] = cpu_to_le32(len); 3469 rc = put_entry(buf, sizeof(u32), 2, fp); 3470 if (rc) 3471 return rc; 3472 rc = put_entry(POLICYDB_STRING, 1, len, fp); 3473 if (rc) 3474 return rc; 3475 3476 /* Write the version, config, and table sizes. */ 3477 info = policydb_lookup_compat(p->policyvers); 3478 if (!info) { 3479 pr_err("SELinux: compatibility lookup failed for policy " 3480 "version %d", p->policyvers); 3481 return -EINVAL; 3482 } 3483 3484 buf[0] = cpu_to_le32(p->policyvers); 3485 buf[1] = cpu_to_le32(config); 3486 buf[2] = cpu_to_le32(info->sym_num); 3487 buf[3] = cpu_to_le32(info->ocon_num); 3488 3489 rc = put_entry(buf, sizeof(u32), 4, fp); 3490 if (rc) 3491 return rc; 3492 3493 if (p->policyvers >= POLICYDB_VERSION_POLCAP) { 3494 rc = ebitmap_write(&p->policycaps, fp); 3495 if (rc) 3496 return rc; 3497 } 3498 3499 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) { 3500 rc = ebitmap_write(&p->permissive_map, fp); 3501 if (rc) 3502 return rc; 3503 } 3504 3505 num_syms = info->sym_num; 3506 for (i = 0; i < num_syms; i++) { 3507 struct policy_data pd; 3508 3509 pd.fp = fp; 3510 pd.p = p; 3511 3512 buf[0] = cpu_to_le32(p->symtab[i].nprim); 3513 buf[1] = cpu_to_le32(p->symtab[i].table->nel); 3514 3515 rc = put_entry(buf, sizeof(u32), 2, fp); 3516 if (rc) 3517 return rc; 3518 rc = hashtab_map(p->symtab[i].table, write_f[i], &pd); 3519 if (rc) 3520 return rc; 3521 } 3522 3523 rc = avtab_write(p, &p->te_avtab, fp); 3524 if (rc) 3525 return rc; 3526 3527 rc = cond_write_list(p, p->cond_list, fp); 3528 if (rc) 3529 return rc; 3530 3531 rc = role_trans_write(p, fp); 3532 if (rc) 3533 return rc; 3534 3535 rc = role_allow_write(p->role_allow, fp); 3536 if (rc) 3537 return rc; 3538 3539 rc = filename_trans_write(p, fp); 3540 if (rc) 3541 return rc; 3542 3543 rc = ocontext_write(p, info, fp); 3544 if (rc) 3545 return rc; 3546 3547 rc = genfs_write(p, fp); 3548 if (rc) 3549 return rc; 3550 3551 rc = range_write(p, fp); 3552 if (rc) 3553 return rc; 3554 3555 for (i = 0; i < p->p_types.nprim; i++) { 3556 struct ebitmap *e = flex_array_get(p->type_attr_map_array, i); 3557 3558 BUG_ON(!e); 3559 rc = ebitmap_write(e, fp); 3560 if (rc) 3561 return rc; 3562 } 3563 3564 return 0; 3565 } 3566