1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Implementation of the policy database. 4 * 5 * Author : Stephen Smalley, <sds@tycho.nsa.gov> 6 */ 7 8 /* 9 * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com> 10 * 11 * Support for enhanced MLS infrastructure. 12 * 13 * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com> 14 * 15 * Added conditional policy language extensions 16 * 17 * Updated: Hewlett-Packard <paul@paul-moore.com> 18 * 19 * Added support for the policy capability bitmap 20 * 21 * Update: Mellanox Techonologies 22 * 23 * Added Infiniband support 24 * 25 * Copyright (C) 2016 Mellanox Techonologies 26 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P. 27 * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc. 28 * Copyright (C) 2003 - 2004 Tresys Technology, LLC 29 */ 30 31 #include <linux/kernel.h> 32 #include <linux/sched.h> 33 #include <linux/slab.h> 34 #include <linux/string.h> 35 #include <linux/errno.h> 36 #include <linux/audit.h> 37 #include "security.h" 38 39 #include "policydb.h" 40 #include "conditional.h" 41 #include "mls.h" 42 #include "services.h" 43 44 #define _DEBUG_HASHES 45 46 #ifdef DEBUG_HASHES 47 static const char *symtab_name[SYM_NUM] = { 48 "common prefixes", 49 "classes", 50 "roles", 51 "types", 52 "users", 53 "bools", 54 "levels", 55 "categories", 56 }; 57 #endif 58 59 static unsigned int symtab_sizes[SYM_NUM] = { 60 2, 61 32, 62 16, 63 512, 64 128, 65 16, 66 16, 67 16, 68 }; 69 70 struct policydb_compat_info { 71 int version; 72 int sym_num; 73 int ocon_num; 74 }; 75 76 /* These need to be updated if SYM_NUM or OCON_NUM changes */ 77 static struct policydb_compat_info policydb_compat[] = { 78 { 79 .version = POLICYDB_VERSION_BASE, 80 .sym_num = SYM_NUM - 3, 81 .ocon_num = OCON_NUM - 3, 82 }, 83 { 84 .version = POLICYDB_VERSION_BOOL, 85 .sym_num = SYM_NUM - 2, 86 .ocon_num = OCON_NUM - 3, 87 }, 88 { 89 .version = POLICYDB_VERSION_IPV6, 90 .sym_num = SYM_NUM - 2, 91 .ocon_num = OCON_NUM - 2, 92 }, 93 { 94 .version = POLICYDB_VERSION_NLCLASS, 95 .sym_num = SYM_NUM - 2, 96 .ocon_num = OCON_NUM - 2, 97 }, 98 { 99 .version = POLICYDB_VERSION_MLS, 100 .sym_num = SYM_NUM, 101 .ocon_num = OCON_NUM - 2, 102 }, 103 { 104 .version = POLICYDB_VERSION_AVTAB, 105 .sym_num = SYM_NUM, 106 .ocon_num = OCON_NUM - 2, 107 }, 108 { 109 .version = POLICYDB_VERSION_RANGETRANS, 110 .sym_num = SYM_NUM, 111 .ocon_num = OCON_NUM - 2, 112 }, 113 { 114 .version = POLICYDB_VERSION_POLCAP, 115 .sym_num = SYM_NUM, 116 .ocon_num = OCON_NUM - 2, 117 }, 118 { 119 .version = POLICYDB_VERSION_PERMISSIVE, 120 .sym_num = SYM_NUM, 121 .ocon_num = OCON_NUM - 2, 122 }, 123 { 124 .version = POLICYDB_VERSION_BOUNDARY, 125 .sym_num = SYM_NUM, 126 .ocon_num = OCON_NUM - 2, 127 }, 128 { 129 .version = POLICYDB_VERSION_FILENAME_TRANS, 130 .sym_num = SYM_NUM, 131 .ocon_num = OCON_NUM - 2, 132 }, 133 { 134 .version = POLICYDB_VERSION_ROLETRANS, 135 .sym_num = SYM_NUM, 136 .ocon_num = OCON_NUM - 2, 137 }, 138 { 139 .version = POLICYDB_VERSION_NEW_OBJECT_DEFAULTS, 140 .sym_num = SYM_NUM, 141 .ocon_num = OCON_NUM - 2, 142 }, 143 { 144 .version = POLICYDB_VERSION_DEFAULT_TYPE, 145 .sym_num = SYM_NUM, 146 .ocon_num = OCON_NUM - 2, 147 }, 148 { 149 .version = POLICYDB_VERSION_CONSTRAINT_NAMES, 150 .sym_num = SYM_NUM, 151 .ocon_num = OCON_NUM - 2, 152 }, 153 { 154 .version = POLICYDB_VERSION_XPERMS_IOCTL, 155 .sym_num = SYM_NUM, 156 .ocon_num = OCON_NUM - 2, 157 }, 158 { 159 .version = POLICYDB_VERSION_INFINIBAND, 160 .sym_num = SYM_NUM, 161 .ocon_num = OCON_NUM, 162 }, 163 }; 164 165 static struct policydb_compat_info *policydb_lookup_compat(int version) 166 { 167 int i; 168 struct policydb_compat_info *info = NULL; 169 170 for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) { 171 if (policydb_compat[i].version == version) { 172 info = &policydb_compat[i]; 173 break; 174 } 175 } 176 return info; 177 } 178 179 /* 180 * The following *_destroy functions are used to 181 * free any memory allocated for each kind of 182 * symbol data in the policy database. 183 */ 184 185 static int perm_destroy(void *key, void *datum, void *p) 186 { 187 kfree(key); 188 kfree(datum); 189 return 0; 190 } 191 192 static int common_destroy(void *key, void *datum, void *p) 193 { 194 struct common_datum *comdatum; 195 196 kfree(key); 197 if (datum) { 198 comdatum = datum; 199 hashtab_map(comdatum->permissions.table, perm_destroy, NULL); 200 hashtab_destroy(comdatum->permissions.table); 201 } 202 kfree(datum); 203 return 0; 204 } 205 206 static void constraint_expr_destroy(struct constraint_expr *expr) 207 { 208 if (expr) { 209 ebitmap_destroy(&expr->names); 210 if (expr->type_names) { 211 ebitmap_destroy(&expr->type_names->types); 212 ebitmap_destroy(&expr->type_names->negset); 213 kfree(expr->type_names); 214 } 215 kfree(expr); 216 } 217 } 218 219 static int cls_destroy(void *key, void *datum, void *p) 220 { 221 struct class_datum *cladatum; 222 struct constraint_node *constraint, *ctemp; 223 struct constraint_expr *e, *etmp; 224 225 kfree(key); 226 if (datum) { 227 cladatum = datum; 228 hashtab_map(cladatum->permissions.table, perm_destroy, NULL); 229 hashtab_destroy(cladatum->permissions.table); 230 constraint = cladatum->constraints; 231 while (constraint) { 232 e = constraint->expr; 233 while (e) { 234 etmp = e; 235 e = e->next; 236 constraint_expr_destroy(etmp); 237 } 238 ctemp = constraint; 239 constraint = constraint->next; 240 kfree(ctemp); 241 } 242 243 constraint = cladatum->validatetrans; 244 while (constraint) { 245 e = constraint->expr; 246 while (e) { 247 etmp = e; 248 e = e->next; 249 constraint_expr_destroy(etmp); 250 } 251 ctemp = constraint; 252 constraint = constraint->next; 253 kfree(ctemp); 254 } 255 kfree(cladatum->comkey); 256 } 257 kfree(datum); 258 return 0; 259 } 260 261 static int role_destroy(void *key, void *datum, void *p) 262 { 263 struct role_datum *role; 264 265 kfree(key); 266 if (datum) { 267 role = datum; 268 ebitmap_destroy(&role->dominates); 269 ebitmap_destroy(&role->types); 270 } 271 kfree(datum); 272 return 0; 273 } 274 275 static int type_destroy(void *key, void *datum, void *p) 276 { 277 kfree(key); 278 kfree(datum); 279 return 0; 280 } 281 282 static int user_destroy(void *key, void *datum, void *p) 283 { 284 struct user_datum *usrdatum; 285 286 kfree(key); 287 if (datum) { 288 usrdatum = datum; 289 ebitmap_destroy(&usrdatum->roles); 290 ebitmap_destroy(&usrdatum->range.level[0].cat); 291 ebitmap_destroy(&usrdatum->range.level[1].cat); 292 ebitmap_destroy(&usrdatum->dfltlevel.cat); 293 } 294 kfree(datum); 295 return 0; 296 } 297 298 static int sens_destroy(void *key, void *datum, void *p) 299 { 300 struct level_datum *levdatum; 301 302 kfree(key); 303 if (datum) { 304 levdatum = datum; 305 if (levdatum->level) 306 ebitmap_destroy(&levdatum->level->cat); 307 kfree(levdatum->level); 308 } 309 kfree(datum); 310 return 0; 311 } 312 313 static int cat_destroy(void *key, void *datum, void *p) 314 { 315 kfree(key); 316 kfree(datum); 317 return 0; 318 } 319 320 static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) = 321 { 322 common_destroy, 323 cls_destroy, 324 role_destroy, 325 type_destroy, 326 user_destroy, 327 cond_destroy_bool, 328 sens_destroy, 329 cat_destroy, 330 }; 331 332 static int filenametr_destroy(void *key, void *datum, void *p) 333 { 334 struct filename_trans *ft = key; 335 336 kfree(ft->name); 337 kfree(key); 338 kfree(datum); 339 cond_resched(); 340 return 0; 341 } 342 343 static int range_tr_destroy(void *key, void *datum, void *p) 344 { 345 struct mls_range *rt = datum; 346 347 kfree(key); 348 ebitmap_destroy(&rt->level[0].cat); 349 ebitmap_destroy(&rt->level[1].cat); 350 kfree(datum); 351 cond_resched(); 352 return 0; 353 } 354 355 static void ocontext_destroy(struct ocontext *c, int i) 356 { 357 if (!c) 358 return; 359 360 context_destroy(&c->context[0]); 361 context_destroy(&c->context[1]); 362 if (i == OCON_ISID || i == OCON_FS || 363 i == OCON_NETIF || i == OCON_FSUSE) 364 kfree(c->u.name); 365 kfree(c); 366 } 367 368 /* 369 * Initialize the role table. 370 */ 371 static int roles_init(struct policydb *p) 372 { 373 char *key = NULL; 374 int rc; 375 struct role_datum *role; 376 377 role = kzalloc(sizeof(*role), GFP_KERNEL); 378 if (!role) 379 return -ENOMEM; 380 381 rc = -EINVAL; 382 role->value = ++p->p_roles.nprim; 383 if (role->value != OBJECT_R_VAL) 384 goto out; 385 386 rc = -ENOMEM; 387 key = kstrdup(OBJECT_R, GFP_KERNEL); 388 if (!key) 389 goto out; 390 391 rc = hashtab_insert(p->p_roles.table, key, role); 392 if (rc) 393 goto out; 394 395 return 0; 396 out: 397 kfree(key); 398 kfree(role); 399 return rc; 400 } 401 402 static u32 filenametr_hash(struct hashtab *h, const void *k) 403 { 404 const struct filename_trans *ft = k; 405 unsigned long hash; 406 unsigned int byte_num; 407 unsigned char focus; 408 409 hash = ft->stype ^ ft->ttype ^ ft->tclass; 410 411 byte_num = 0; 412 while ((focus = ft->name[byte_num++])) 413 hash = partial_name_hash(focus, hash); 414 return hash & (h->size - 1); 415 } 416 417 static int filenametr_cmp(struct hashtab *h, const void *k1, const void *k2) 418 { 419 const struct filename_trans *ft1 = k1; 420 const struct filename_trans *ft2 = k2; 421 int v; 422 423 v = ft1->stype - ft2->stype; 424 if (v) 425 return v; 426 427 v = ft1->ttype - ft2->ttype; 428 if (v) 429 return v; 430 431 v = ft1->tclass - ft2->tclass; 432 if (v) 433 return v; 434 435 return strcmp(ft1->name, ft2->name); 436 437 } 438 439 static u32 rangetr_hash(struct hashtab *h, const void *k) 440 { 441 const struct range_trans *key = k; 442 443 return (key->source_type + (key->target_type << 3) + 444 (key->target_class << 5)) & (h->size - 1); 445 } 446 447 static int rangetr_cmp(struct hashtab *h, const void *k1, const void *k2) 448 { 449 const struct range_trans *key1 = k1, *key2 = k2; 450 int v; 451 452 v = key1->source_type - key2->source_type; 453 if (v) 454 return v; 455 456 v = key1->target_type - key2->target_type; 457 if (v) 458 return v; 459 460 v = key1->target_class - key2->target_class; 461 462 return v; 463 } 464 465 /* 466 * Initialize a policy database structure. 467 */ 468 static int policydb_init(struct policydb *p) 469 { 470 int i, rc; 471 472 memset(p, 0, sizeof(*p)); 473 474 for (i = 0; i < SYM_NUM; i++) { 475 rc = symtab_init(&p->symtab[i], symtab_sizes[i]); 476 if (rc) 477 goto out; 478 } 479 480 rc = avtab_init(&p->te_avtab); 481 if (rc) 482 goto out; 483 484 rc = roles_init(p); 485 if (rc) 486 goto out; 487 488 rc = cond_policydb_init(p); 489 if (rc) 490 goto out; 491 492 p->filename_trans = hashtab_create(filenametr_hash, filenametr_cmp, 493 (1 << 10)); 494 if (!p->filename_trans) { 495 rc = -ENOMEM; 496 goto out; 497 } 498 499 p->range_tr = hashtab_create(rangetr_hash, rangetr_cmp, 256); 500 if (!p->range_tr) { 501 rc = -ENOMEM; 502 goto out; 503 } 504 505 ebitmap_init(&p->filename_trans_ttypes); 506 ebitmap_init(&p->policycaps); 507 ebitmap_init(&p->permissive_map); 508 509 return 0; 510 out: 511 hashtab_destroy(p->filename_trans); 512 hashtab_destroy(p->range_tr); 513 for (i = 0; i < SYM_NUM; i++) { 514 hashtab_map(p->symtab[i].table, destroy_f[i], NULL); 515 hashtab_destroy(p->symtab[i].table); 516 } 517 return rc; 518 } 519 520 /* 521 * The following *_index functions are used to 522 * define the val_to_name and val_to_struct arrays 523 * in a policy database structure. The val_to_name 524 * arrays are used when converting security context 525 * structures into string representations. The 526 * val_to_struct arrays are used when the attributes 527 * of a class, role, or user are needed. 528 */ 529 530 static int common_index(void *key, void *datum, void *datap) 531 { 532 struct policydb *p; 533 struct common_datum *comdatum; 534 535 comdatum = datum; 536 p = datap; 537 if (!comdatum->value || comdatum->value > p->p_commons.nprim) 538 return -EINVAL; 539 540 p->sym_val_to_name[SYM_COMMONS][comdatum->value - 1] = key; 541 542 return 0; 543 } 544 545 static int class_index(void *key, void *datum, void *datap) 546 { 547 struct policydb *p; 548 struct class_datum *cladatum; 549 550 cladatum = datum; 551 p = datap; 552 if (!cladatum->value || cladatum->value > p->p_classes.nprim) 553 return -EINVAL; 554 555 p->sym_val_to_name[SYM_CLASSES][cladatum->value - 1] = key; 556 p->class_val_to_struct[cladatum->value - 1] = cladatum; 557 return 0; 558 } 559 560 static int role_index(void *key, void *datum, void *datap) 561 { 562 struct policydb *p; 563 struct role_datum *role; 564 565 role = datum; 566 p = datap; 567 if (!role->value 568 || role->value > p->p_roles.nprim 569 || role->bounds > p->p_roles.nprim) 570 return -EINVAL; 571 572 p->sym_val_to_name[SYM_ROLES][role->value - 1] = key; 573 p->role_val_to_struct[role->value - 1] = role; 574 return 0; 575 } 576 577 static int type_index(void *key, void *datum, void *datap) 578 { 579 struct policydb *p; 580 struct type_datum *typdatum; 581 582 typdatum = datum; 583 p = datap; 584 585 if (typdatum->primary) { 586 if (!typdatum->value 587 || typdatum->value > p->p_types.nprim 588 || typdatum->bounds > p->p_types.nprim) 589 return -EINVAL; 590 p->sym_val_to_name[SYM_TYPES][typdatum->value - 1] = key; 591 p->type_val_to_struct[typdatum->value - 1] = typdatum; 592 } 593 594 return 0; 595 } 596 597 static int user_index(void *key, void *datum, void *datap) 598 { 599 struct policydb *p; 600 struct user_datum *usrdatum; 601 602 usrdatum = datum; 603 p = datap; 604 if (!usrdatum->value 605 || usrdatum->value > p->p_users.nprim 606 || usrdatum->bounds > p->p_users.nprim) 607 return -EINVAL; 608 609 p->sym_val_to_name[SYM_USERS][usrdatum->value - 1] = key; 610 p->user_val_to_struct[usrdatum->value - 1] = usrdatum; 611 return 0; 612 } 613 614 static int sens_index(void *key, void *datum, void *datap) 615 { 616 struct policydb *p; 617 struct level_datum *levdatum; 618 619 levdatum = datum; 620 p = datap; 621 622 if (!levdatum->isalias) { 623 if (!levdatum->level->sens || 624 levdatum->level->sens > p->p_levels.nprim) 625 return -EINVAL; 626 627 p->sym_val_to_name[SYM_LEVELS][levdatum->level->sens - 1] = key; 628 } 629 630 return 0; 631 } 632 633 static int cat_index(void *key, void *datum, void *datap) 634 { 635 struct policydb *p; 636 struct cat_datum *catdatum; 637 638 catdatum = datum; 639 p = datap; 640 641 if (!catdatum->isalias) { 642 if (!catdatum->value || catdatum->value > p->p_cats.nprim) 643 return -EINVAL; 644 645 p->sym_val_to_name[SYM_CATS][catdatum->value - 1] = key; 646 } 647 648 return 0; 649 } 650 651 static int (*index_f[SYM_NUM]) (void *key, void *datum, void *datap) = 652 { 653 common_index, 654 class_index, 655 role_index, 656 type_index, 657 user_index, 658 cond_index_bool, 659 sens_index, 660 cat_index, 661 }; 662 663 #ifdef DEBUG_HASHES 664 static void hash_eval(struct hashtab *h, const char *hash_name) 665 { 666 struct hashtab_info info; 667 668 hashtab_stat(h, &info); 669 pr_debug("SELinux: %s: %d entries and %d/%d buckets used, longest chain length %d\n", 670 hash_name, h->nel, info.slots_used, h->size, 671 info.max_chain_len); 672 } 673 674 static void symtab_hash_eval(struct symtab *s) 675 { 676 int i; 677 678 for (i = 0; i < SYM_NUM; i++) 679 hash_eval(s[i].table, symtab_name[i]); 680 } 681 682 #else 683 static inline void hash_eval(struct hashtab *h, char *hash_name) 684 { 685 } 686 #endif 687 688 /* 689 * Define the other val_to_name and val_to_struct arrays 690 * in a policy database structure. 691 * 692 * Caller must clean up on failure. 693 */ 694 static int policydb_index(struct policydb *p) 695 { 696 int i, rc; 697 698 if (p->mls_enabled) 699 pr_debug("SELinux: %d users, %d roles, %d types, %d bools, %d sens, %d cats\n", 700 p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim, 701 p->p_bools.nprim, p->p_levels.nprim, p->p_cats.nprim); 702 else 703 pr_debug("SELinux: %d users, %d roles, %d types, %d bools\n", 704 p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim, 705 p->p_bools.nprim); 706 707 pr_debug("SELinux: %d classes, %d rules\n", 708 p->p_classes.nprim, p->te_avtab.nel); 709 710 #ifdef DEBUG_HASHES 711 avtab_hash_eval(&p->te_avtab, "rules"); 712 symtab_hash_eval(p->symtab); 713 #endif 714 715 p->class_val_to_struct = kcalloc(p->p_classes.nprim, 716 sizeof(*p->class_val_to_struct), 717 GFP_KERNEL); 718 if (!p->class_val_to_struct) 719 return -ENOMEM; 720 721 p->role_val_to_struct = kcalloc(p->p_roles.nprim, 722 sizeof(*p->role_val_to_struct), 723 GFP_KERNEL); 724 if (!p->role_val_to_struct) 725 return -ENOMEM; 726 727 p->user_val_to_struct = kcalloc(p->p_users.nprim, 728 sizeof(*p->user_val_to_struct), 729 GFP_KERNEL); 730 if (!p->user_val_to_struct) 731 return -ENOMEM; 732 733 p->type_val_to_struct = kvcalloc(p->p_types.nprim, 734 sizeof(*p->type_val_to_struct), 735 GFP_KERNEL); 736 if (!p->type_val_to_struct) 737 return -ENOMEM; 738 739 rc = cond_init_bool_indexes(p); 740 if (rc) 741 goto out; 742 743 for (i = 0; i < SYM_NUM; i++) { 744 p->sym_val_to_name[i] = kvcalloc(p->symtab[i].nprim, 745 sizeof(char *), 746 GFP_KERNEL); 747 if (!p->sym_val_to_name[i]) 748 return -ENOMEM; 749 750 rc = hashtab_map(p->symtab[i].table, index_f[i], p); 751 if (rc) 752 goto out; 753 } 754 rc = 0; 755 out: 756 return rc; 757 } 758 759 /* 760 * Free any memory allocated by a policy database structure. 761 */ 762 void policydb_destroy(struct policydb *p) 763 { 764 struct ocontext *c, *ctmp; 765 struct genfs *g, *gtmp; 766 int i; 767 struct role_allow *ra, *lra = NULL; 768 struct role_trans *tr, *ltr = NULL; 769 770 for (i = 0; i < SYM_NUM; i++) { 771 cond_resched(); 772 hashtab_map(p->symtab[i].table, destroy_f[i], NULL); 773 hashtab_destroy(p->symtab[i].table); 774 } 775 776 for (i = 0; i < SYM_NUM; i++) 777 kvfree(p->sym_val_to_name[i]); 778 779 kfree(p->class_val_to_struct); 780 kfree(p->role_val_to_struct); 781 kfree(p->user_val_to_struct); 782 kvfree(p->type_val_to_struct); 783 784 avtab_destroy(&p->te_avtab); 785 786 for (i = 0; i < OCON_NUM; i++) { 787 cond_resched(); 788 c = p->ocontexts[i]; 789 while (c) { 790 ctmp = c; 791 c = c->next; 792 ocontext_destroy(ctmp, i); 793 } 794 p->ocontexts[i] = NULL; 795 } 796 797 g = p->genfs; 798 while (g) { 799 cond_resched(); 800 kfree(g->fstype); 801 c = g->head; 802 while (c) { 803 ctmp = c; 804 c = c->next; 805 ocontext_destroy(ctmp, OCON_FSUSE); 806 } 807 gtmp = g; 808 g = g->next; 809 kfree(gtmp); 810 } 811 p->genfs = NULL; 812 813 cond_policydb_destroy(p); 814 815 for (tr = p->role_tr; tr; tr = tr->next) { 816 cond_resched(); 817 kfree(ltr); 818 ltr = tr; 819 } 820 kfree(ltr); 821 822 for (ra = p->role_allow; ra; ra = ra->next) { 823 cond_resched(); 824 kfree(lra); 825 lra = ra; 826 } 827 kfree(lra); 828 829 hashtab_map(p->filename_trans, filenametr_destroy, NULL); 830 hashtab_destroy(p->filename_trans); 831 832 hashtab_map(p->range_tr, range_tr_destroy, NULL); 833 hashtab_destroy(p->range_tr); 834 835 if (p->type_attr_map_array) { 836 for (i = 0; i < p->p_types.nprim; i++) 837 ebitmap_destroy(&p->type_attr_map_array[i]); 838 kvfree(p->type_attr_map_array); 839 } 840 841 ebitmap_destroy(&p->filename_trans_ttypes); 842 ebitmap_destroy(&p->policycaps); 843 ebitmap_destroy(&p->permissive_map); 844 } 845 846 /* 847 * Load the initial SIDs specified in a policy database 848 * structure into a SID table. 849 */ 850 int policydb_load_isids(struct policydb *p, struct sidtab *s) 851 { 852 struct ocontext *head, *c; 853 int rc; 854 855 rc = sidtab_init(s); 856 if (rc) { 857 pr_err("SELinux: out of memory on SID table init\n"); 858 goto out; 859 } 860 861 head = p->ocontexts[OCON_ISID]; 862 for (c = head; c; c = c->next) { 863 rc = -EINVAL; 864 if (!c->context[0].user) { 865 pr_err("SELinux: SID %s was never defined.\n", 866 c->u.name); 867 sidtab_destroy(s); 868 goto out; 869 } 870 if (c->sid[0] == SECSID_NULL || c->sid[0] > SECINITSID_NUM) { 871 pr_err("SELinux: Initial SID %s out of range.\n", 872 c->u.name); 873 sidtab_destroy(s); 874 goto out; 875 } 876 877 rc = sidtab_set_initial(s, c->sid[0], &c->context[0]); 878 if (rc) { 879 pr_err("SELinux: unable to load initial SID %s.\n", 880 c->u.name); 881 sidtab_destroy(s); 882 goto out; 883 } 884 } 885 rc = 0; 886 out: 887 return rc; 888 } 889 890 int policydb_class_isvalid(struct policydb *p, unsigned int class) 891 { 892 if (!class || class > p->p_classes.nprim) 893 return 0; 894 return 1; 895 } 896 897 int policydb_role_isvalid(struct policydb *p, unsigned int role) 898 { 899 if (!role || role > p->p_roles.nprim) 900 return 0; 901 return 1; 902 } 903 904 int policydb_type_isvalid(struct policydb *p, unsigned int type) 905 { 906 if (!type || type > p->p_types.nprim) 907 return 0; 908 return 1; 909 } 910 911 /* 912 * Return 1 if the fields in the security context 913 * structure `c' are valid. Return 0 otherwise. 914 */ 915 int policydb_context_isvalid(struct policydb *p, struct context *c) 916 { 917 struct role_datum *role; 918 struct user_datum *usrdatum; 919 920 if (!c->role || c->role > p->p_roles.nprim) 921 return 0; 922 923 if (!c->user || c->user > p->p_users.nprim) 924 return 0; 925 926 if (!c->type || c->type > p->p_types.nprim) 927 return 0; 928 929 if (c->role != OBJECT_R_VAL) { 930 /* 931 * Role must be authorized for the type. 932 */ 933 role = p->role_val_to_struct[c->role - 1]; 934 if (!role || !ebitmap_get_bit(&role->types, c->type - 1)) 935 /* role may not be associated with type */ 936 return 0; 937 938 /* 939 * User must be authorized for the role. 940 */ 941 usrdatum = p->user_val_to_struct[c->user - 1]; 942 if (!usrdatum) 943 return 0; 944 945 if (!ebitmap_get_bit(&usrdatum->roles, c->role - 1)) 946 /* user may not be associated with role */ 947 return 0; 948 } 949 950 if (!mls_context_isvalid(p, c)) 951 return 0; 952 953 return 1; 954 } 955 956 /* 957 * Read a MLS range structure from a policydb binary 958 * representation file. 959 */ 960 static int mls_read_range_helper(struct mls_range *r, void *fp) 961 { 962 __le32 buf[2]; 963 u32 items; 964 int rc; 965 966 rc = next_entry(buf, fp, sizeof(u32)); 967 if (rc) 968 goto out; 969 970 rc = -EINVAL; 971 items = le32_to_cpu(buf[0]); 972 if (items > ARRAY_SIZE(buf)) { 973 pr_err("SELinux: mls: range overflow\n"); 974 goto out; 975 } 976 977 rc = next_entry(buf, fp, sizeof(u32) * items); 978 if (rc) { 979 pr_err("SELinux: mls: truncated range\n"); 980 goto out; 981 } 982 983 r->level[0].sens = le32_to_cpu(buf[0]); 984 if (items > 1) 985 r->level[1].sens = le32_to_cpu(buf[1]); 986 else 987 r->level[1].sens = r->level[0].sens; 988 989 rc = ebitmap_read(&r->level[0].cat, fp); 990 if (rc) { 991 pr_err("SELinux: mls: error reading low categories\n"); 992 goto out; 993 } 994 if (items > 1) { 995 rc = ebitmap_read(&r->level[1].cat, fp); 996 if (rc) { 997 pr_err("SELinux: mls: error reading high categories\n"); 998 goto bad_high; 999 } 1000 } else { 1001 rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat); 1002 if (rc) { 1003 pr_err("SELinux: mls: out of memory\n"); 1004 goto bad_high; 1005 } 1006 } 1007 1008 return 0; 1009 bad_high: 1010 ebitmap_destroy(&r->level[0].cat); 1011 out: 1012 return rc; 1013 } 1014 1015 /* 1016 * Read and validate a security context structure 1017 * from a policydb binary representation file. 1018 */ 1019 static int context_read_and_validate(struct context *c, 1020 struct policydb *p, 1021 void *fp) 1022 { 1023 __le32 buf[3]; 1024 int rc; 1025 1026 rc = next_entry(buf, fp, sizeof buf); 1027 if (rc) { 1028 pr_err("SELinux: context truncated\n"); 1029 goto out; 1030 } 1031 c->user = le32_to_cpu(buf[0]); 1032 c->role = le32_to_cpu(buf[1]); 1033 c->type = le32_to_cpu(buf[2]); 1034 if (p->policyvers >= POLICYDB_VERSION_MLS) { 1035 rc = mls_read_range_helper(&c->range, fp); 1036 if (rc) { 1037 pr_err("SELinux: error reading MLS range of context\n"); 1038 goto out; 1039 } 1040 } 1041 1042 rc = -EINVAL; 1043 if (!policydb_context_isvalid(p, c)) { 1044 pr_err("SELinux: invalid security context\n"); 1045 context_destroy(c); 1046 goto out; 1047 } 1048 rc = 0; 1049 out: 1050 return rc; 1051 } 1052 1053 /* 1054 * The following *_read functions are used to 1055 * read the symbol data from a policy database 1056 * binary representation file. 1057 */ 1058 1059 static int str_read(char **strp, gfp_t flags, void *fp, u32 len) 1060 { 1061 int rc; 1062 char *str; 1063 1064 if ((len == 0) || (len == (u32)-1)) 1065 return -EINVAL; 1066 1067 str = kmalloc(len + 1, flags | __GFP_NOWARN); 1068 if (!str) 1069 return -ENOMEM; 1070 1071 /* it's expected the caller should free the str */ 1072 *strp = str; 1073 1074 rc = next_entry(str, fp, len); 1075 if (rc) 1076 return rc; 1077 1078 str[len] = '\0'; 1079 return 0; 1080 } 1081 1082 static int perm_read(struct policydb *p, struct hashtab *h, void *fp) 1083 { 1084 char *key = NULL; 1085 struct perm_datum *perdatum; 1086 int rc; 1087 __le32 buf[2]; 1088 u32 len; 1089 1090 perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL); 1091 if (!perdatum) 1092 return -ENOMEM; 1093 1094 rc = next_entry(buf, fp, sizeof buf); 1095 if (rc) 1096 goto bad; 1097 1098 len = le32_to_cpu(buf[0]); 1099 perdatum->value = le32_to_cpu(buf[1]); 1100 1101 rc = str_read(&key, GFP_KERNEL, fp, len); 1102 if (rc) 1103 goto bad; 1104 1105 rc = hashtab_insert(h, key, perdatum); 1106 if (rc) 1107 goto bad; 1108 1109 return 0; 1110 bad: 1111 perm_destroy(key, perdatum, NULL); 1112 return rc; 1113 } 1114 1115 static int common_read(struct policydb *p, struct hashtab *h, void *fp) 1116 { 1117 char *key = NULL; 1118 struct common_datum *comdatum; 1119 __le32 buf[4]; 1120 u32 len, nel; 1121 int i, rc; 1122 1123 comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL); 1124 if (!comdatum) 1125 return -ENOMEM; 1126 1127 rc = next_entry(buf, fp, sizeof buf); 1128 if (rc) 1129 goto bad; 1130 1131 len = le32_to_cpu(buf[0]); 1132 comdatum->value = le32_to_cpu(buf[1]); 1133 1134 rc = symtab_init(&comdatum->permissions, PERM_SYMTAB_SIZE); 1135 if (rc) 1136 goto bad; 1137 comdatum->permissions.nprim = le32_to_cpu(buf[2]); 1138 nel = le32_to_cpu(buf[3]); 1139 1140 rc = str_read(&key, GFP_KERNEL, fp, len); 1141 if (rc) 1142 goto bad; 1143 1144 for (i = 0; i < nel; i++) { 1145 rc = perm_read(p, comdatum->permissions.table, fp); 1146 if (rc) 1147 goto bad; 1148 } 1149 1150 rc = hashtab_insert(h, key, comdatum); 1151 if (rc) 1152 goto bad; 1153 return 0; 1154 bad: 1155 common_destroy(key, comdatum, NULL); 1156 return rc; 1157 } 1158 1159 static void type_set_init(struct type_set *t) 1160 { 1161 ebitmap_init(&t->types); 1162 ebitmap_init(&t->negset); 1163 } 1164 1165 static int type_set_read(struct type_set *t, void *fp) 1166 { 1167 __le32 buf[1]; 1168 int rc; 1169 1170 if (ebitmap_read(&t->types, fp)) 1171 return -EINVAL; 1172 if (ebitmap_read(&t->negset, fp)) 1173 return -EINVAL; 1174 1175 rc = next_entry(buf, fp, sizeof(u32)); 1176 if (rc < 0) 1177 return -EINVAL; 1178 t->flags = le32_to_cpu(buf[0]); 1179 1180 return 0; 1181 } 1182 1183 1184 static int read_cons_helper(struct policydb *p, 1185 struct constraint_node **nodep, 1186 int ncons, int allowxtarget, void *fp) 1187 { 1188 struct constraint_node *c, *lc; 1189 struct constraint_expr *e, *le; 1190 __le32 buf[3]; 1191 u32 nexpr; 1192 int rc, i, j, depth; 1193 1194 lc = NULL; 1195 for (i = 0; i < ncons; i++) { 1196 c = kzalloc(sizeof(*c), GFP_KERNEL); 1197 if (!c) 1198 return -ENOMEM; 1199 1200 if (lc) 1201 lc->next = c; 1202 else 1203 *nodep = c; 1204 1205 rc = next_entry(buf, fp, (sizeof(u32) * 2)); 1206 if (rc) 1207 return rc; 1208 c->permissions = le32_to_cpu(buf[0]); 1209 nexpr = le32_to_cpu(buf[1]); 1210 le = NULL; 1211 depth = -1; 1212 for (j = 0; j < nexpr; j++) { 1213 e = kzalloc(sizeof(*e), GFP_KERNEL); 1214 if (!e) 1215 return -ENOMEM; 1216 1217 if (le) 1218 le->next = e; 1219 else 1220 c->expr = e; 1221 1222 rc = next_entry(buf, fp, (sizeof(u32) * 3)); 1223 if (rc) 1224 return rc; 1225 e->expr_type = le32_to_cpu(buf[0]); 1226 e->attr = le32_to_cpu(buf[1]); 1227 e->op = le32_to_cpu(buf[2]); 1228 1229 switch (e->expr_type) { 1230 case CEXPR_NOT: 1231 if (depth < 0) 1232 return -EINVAL; 1233 break; 1234 case CEXPR_AND: 1235 case CEXPR_OR: 1236 if (depth < 1) 1237 return -EINVAL; 1238 depth--; 1239 break; 1240 case CEXPR_ATTR: 1241 if (depth == (CEXPR_MAXDEPTH - 1)) 1242 return -EINVAL; 1243 depth++; 1244 break; 1245 case CEXPR_NAMES: 1246 if (!allowxtarget && (e->attr & CEXPR_XTARGET)) 1247 return -EINVAL; 1248 if (depth == (CEXPR_MAXDEPTH - 1)) 1249 return -EINVAL; 1250 depth++; 1251 rc = ebitmap_read(&e->names, fp); 1252 if (rc) 1253 return rc; 1254 if (p->policyvers >= 1255 POLICYDB_VERSION_CONSTRAINT_NAMES) { 1256 e->type_names = kzalloc(sizeof 1257 (*e->type_names), 1258 GFP_KERNEL); 1259 if (!e->type_names) 1260 return -ENOMEM; 1261 type_set_init(e->type_names); 1262 rc = type_set_read(e->type_names, fp); 1263 if (rc) 1264 return rc; 1265 } 1266 break; 1267 default: 1268 return -EINVAL; 1269 } 1270 le = e; 1271 } 1272 if (depth != 0) 1273 return -EINVAL; 1274 lc = c; 1275 } 1276 1277 return 0; 1278 } 1279 1280 static int class_read(struct policydb *p, struct hashtab *h, void *fp) 1281 { 1282 char *key = NULL; 1283 struct class_datum *cladatum; 1284 __le32 buf[6]; 1285 u32 len, len2, ncons, nel; 1286 int i, rc; 1287 1288 cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL); 1289 if (!cladatum) 1290 return -ENOMEM; 1291 1292 rc = next_entry(buf, fp, sizeof(u32)*6); 1293 if (rc) 1294 goto bad; 1295 1296 len = le32_to_cpu(buf[0]); 1297 len2 = le32_to_cpu(buf[1]); 1298 cladatum->value = le32_to_cpu(buf[2]); 1299 1300 rc = symtab_init(&cladatum->permissions, PERM_SYMTAB_SIZE); 1301 if (rc) 1302 goto bad; 1303 cladatum->permissions.nprim = le32_to_cpu(buf[3]); 1304 nel = le32_to_cpu(buf[4]); 1305 1306 ncons = le32_to_cpu(buf[5]); 1307 1308 rc = str_read(&key, GFP_KERNEL, fp, len); 1309 if (rc) 1310 goto bad; 1311 1312 if (len2) { 1313 rc = str_read(&cladatum->comkey, GFP_KERNEL, fp, len2); 1314 if (rc) 1315 goto bad; 1316 1317 rc = -EINVAL; 1318 cladatum->comdatum = hashtab_search(p->p_commons.table, cladatum->comkey); 1319 if (!cladatum->comdatum) { 1320 pr_err("SELinux: unknown common %s\n", 1321 cladatum->comkey); 1322 goto bad; 1323 } 1324 } 1325 for (i = 0; i < nel; i++) { 1326 rc = perm_read(p, cladatum->permissions.table, fp); 1327 if (rc) 1328 goto bad; 1329 } 1330 1331 rc = read_cons_helper(p, &cladatum->constraints, ncons, 0, fp); 1332 if (rc) 1333 goto bad; 1334 1335 if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) { 1336 /* grab the validatetrans rules */ 1337 rc = next_entry(buf, fp, sizeof(u32)); 1338 if (rc) 1339 goto bad; 1340 ncons = le32_to_cpu(buf[0]); 1341 rc = read_cons_helper(p, &cladatum->validatetrans, 1342 ncons, 1, fp); 1343 if (rc) 1344 goto bad; 1345 } 1346 1347 if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) { 1348 rc = next_entry(buf, fp, sizeof(u32) * 3); 1349 if (rc) 1350 goto bad; 1351 1352 cladatum->default_user = le32_to_cpu(buf[0]); 1353 cladatum->default_role = le32_to_cpu(buf[1]); 1354 cladatum->default_range = le32_to_cpu(buf[2]); 1355 } 1356 1357 if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) { 1358 rc = next_entry(buf, fp, sizeof(u32) * 1); 1359 if (rc) 1360 goto bad; 1361 cladatum->default_type = le32_to_cpu(buf[0]); 1362 } 1363 1364 rc = hashtab_insert(h, key, cladatum); 1365 if (rc) 1366 goto bad; 1367 1368 return 0; 1369 bad: 1370 cls_destroy(key, cladatum, NULL); 1371 return rc; 1372 } 1373 1374 static int role_read(struct policydb *p, struct hashtab *h, void *fp) 1375 { 1376 char *key = NULL; 1377 struct role_datum *role; 1378 int rc, to_read = 2; 1379 __le32 buf[3]; 1380 u32 len; 1381 1382 role = kzalloc(sizeof(*role), GFP_KERNEL); 1383 if (!role) 1384 return -ENOMEM; 1385 1386 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) 1387 to_read = 3; 1388 1389 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read); 1390 if (rc) 1391 goto bad; 1392 1393 len = le32_to_cpu(buf[0]); 1394 role->value = le32_to_cpu(buf[1]); 1395 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) 1396 role->bounds = le32_to_cpu(buf[2]); 1397 1398 rc = str_read(&key, GFP_KERNEL, fp, len); 1399 if (rc) 1400 goto bad; 1401 1402 rc = ebitmap_read(&role->dominates, fp); 1403 if (rc) 1404 goto bad; 1405 1406 rc = ebitmap_read(&role->types, fp); 1407 if (rc) 1408 goto bad; 1409 1410 if (strcmp(key, OBJECT_R) == 0) { 1411 rc = -EINVAL; 1412 if (role->value != OBJECT_R_VAL) { 1413 pr_err("SELinux: Role %s has wrong value %d\n", 1414 OBJECT_R, role->value); 1415 goto bad; 1416 } 1417 rc = 0; 1418 goto bad; 1419 } 1420 1421 rc = hashtab_insert(h, key, role); 1422 if (rc) 1423 goto bad; 1424 return 0; 1425 bad: 1426 role_destroy(key, role, NULL); 1427 return rc; 1428 } 1429 1430 static int type_read(struct policydb *p, struct hashtab *h, void *fp) 1431 { 1432 char *key = NULL; 1433 struct type_datum *typdatum; 1434 int rc, to_read = 3; 1435 __le32 buf[4]; 1436 u32 len; 1437 1438 typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL); 1439 if (!typdatum) 1440 return -ENOMEM; 1441 1442 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) 1443 to_read = 4; 1444 1445 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read); 1446 if (rc) 1447 goto bad; 1448 1449 len = le32_to_cpu(buf[0]); 1450 typdatum->value = le32_to_cpu(buf[1]); 1451 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) { 1452 u32 prop = le32_to_cpu(buf[2]); 1453 1454 if (prop & TYPEDATUM_PROPERTY_PRIMARY) 1455 typdatum->primary = 1; 1456 if (prop & TYPEDATUM_PROPERTY_ATTRIBUTE) 1457 typdatum->attribute = 1; 1458 1459 typdatum->bounds = le32_to_cpu(buf[3]); 1460 } else { 1461 typdatum->primary = le32_to_cpu(buf[2]); 1462 } 1463 1464 rc = str_read(&key, GFP_KERNEL, fp, len); 1465 if (rc) 1466 goto bad; 1467 1468 rc = hashtab_insert(h, key, typdatum); 1469 if (rc) 1470 goto bad; 1471 return 0; 1472 bad: 1473 type_destroy(key, typdatum, NULL); 1474 return rc; 1475 } 1476 1477 1478 /* 1479 * Read a MLS level structure from a policydb binary 1480 * representation file. 1481 */ 1482 static int mls_read_level(struct mls_level *lp, void *fp) 1483 { 1484 __le32 buf[1]; 1485 int rc; 1486 1487 memset(lp, 0, sizeof(*lp)); 1488 1489 rc = next_entry(buf, fp, sizeof buf); 1490 if (rc) { 1491 pr_err("SELinux: mls: truncated level\n"); 1492 return rc; 1493 } 1494 lp->sens = le32_to_cpu(buf[0]); 1495 1496 rc = ebitmap_read(&lp->cat, fp); 1497 if (rc) { 1498 pr_err("SELinux: mls: error reading level categories\n"); 1499 return rc; 1500 } 1501 return 0; 1502 } 1503 1504 static int user_read(struct policydb *p, struct hashtab *h, void *fp) 1505 { 1506 char *key = NULL; 1507 struct user_datum *usrdatum; 1508 int rc, to_read = 2; 1509 __le32 buf[3]; 1510 u32 len; 1511 1512 usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL); 1513 if (!usrdatum) 1514 return -ENOMEM; 1515 1516 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) 1517 to_read = 3; 1518 1519 rc = next_entry(buf, fp, sizeof(buf[0]) * to_read); 1520 if (rc) 1521 goto bad; 1522 1523 len = le32_to_cpu(buf[0]); 1524 usrdatum->value = le32_to_cpu(buf[1]); 1525 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) 1526 usrdatum->bounds = le32_to_cpu(buf[2]); 1527 1528 rc = str_read(&key, GFP_KERNEL, fp, len); 1529 if (rc) 1530 goto bad; 1531 1532 rc = ebitmap_read(&usrdatum->roles, fp); 1533 if (rc) 1534 goto bad; 1535 1536 if (p->policyvers >= POLICYDB_VERSION_MLS) { 1537 rc = mls_read_range_helper(&usrdatum->range, fp); 1538 if (rc) 1539 goto bad; 1540 rc = mls_read_level(&usrdatum->dfltlevel, fp); 1541 if (rc) 1542 goto bad; 1543 } 1544 1545 rc = hashtab_insert(h, key, usrdatum); 1546 if (rc) 1547 goto bad; 1548 return 0; 1549 bad: 1550 user_destroy(key, usrdatum, NULL); 1551 return rc; 1552 } 1553 1554 static int sens_read(struct policydb *p, struct hashtab *h, void *fp) 1555 { 1556 char *key = NULL; 1557 struct level_datum *levdatum; 1558 int rc; 1559 __le32 buf[2]; 1560 u32 len; 1561 1562 levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC); 1563 if (!levdatum) 1564 return -ENOMEM; 1565 1566 rc = next_entry(buf, fp, sizeof buf); 1567 if (rc) 1568 goto bad; 1569 1570 len = le32_to_cpu(buf[0]); 1571 levdatum->isalias = le32_to_cpu(buf[1]); 1572 1573 rc = str_read(&key, GFP_ATOMIC, fp, len); 1574 if (rc) 1575 goto bad; 1576 1577 rc = -ENOMEM; 1578 levdatum->level = kmalloc(sizeof(*levdatum->level), GFP_ATOMIC); 1579 if (!levdatum->level) 1580 goto bad; 1581 1582 rc = mls_read_level(levdatum->level, fp); 1583 if (rc) 1584 goto bad; 1585 1586 rc = hashtab_insert(h, key, levdatum); 1587 if (rc) 1588 goto bad; 1589 return 0; 1590 bad: 1591 sens_destroy(key, levdatum, NULL); 1592 return rc; 1593 } 1594 1595 static int cat_read(struct policydb *p, struct hashtab *h, void *fp) 1596 { 1597 char *key = NULL; 1598 struct cat_datum *catdatum; 1599 int rc; 1600 __le32 buf[3]; 1601 u32 len; 1602 1603 catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC); 1604 if (!catdatum) 1605 return -ENOMEM; 1606 1607 rc = next_entry(buf, fp, sizeof buf); 1608 if (rc) 1609 goto bad; 1610 1611 len = le32_to_cpu(buf[0]); 1612 catdatum->value = le32_to_cpu(buf[1]); 1613 catdatum->isalias = le32_to_cpu(buf[2]); 1614 1615 rc = str_read(&key, GFP_ATOMIC, fp, len); 1616 if (rc) 1617 goto bad; 1618 1619 rc = hashtab_insert(h, key, catdatum); 1620 if (rc) 1621 goto bad; 1622 return 0; 1623 bad: 1624 cat_destroy(key, catdatum, NULL); 1625 return rc; 1626 } 1627 1628 static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, void *fp) = 1629 { 1630 common_read, 1631 class_read, 1632 role_read, 1633 type_read, 1634 user_read, 1635 cond_read_bool, 1636 sens_read, 1637 cat_read, 1638 }; 1639 1640 static int user_bounds_sanity_check(void *key, void *datum, void *datap) 1641 { 1642 struct user_datum *upper, *user; 1643 struct policydb *p = datap; 1644 int depth = 0; 1645 1646 upper = user = datum; 1647 while (upper->bounds) { 1648 struct ebitmap_node *node; 1649 unsigned long bit; 1650 1651 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) { 1652 pr_err("SELinux: user %s: " 1653 "too deep or looped boundary", 1654 (char *) key); 1655 return -EINVAL; 1656 } 1657 1658 upper = p->user_val_to_struct[upper->bounds - 1]; 1659 ebitmap_for_each_positive_bit(&user->roles, node, bit) { 1660 if (ebitmap_get_bit(&upper->roles, bit)) 1661 continue; 1662 1663 pr_err("SELinux: boundary violated policy: " 1664 "user=%s role=%s bounds=%s\n", 1665 sym_name(p, SYM_USERS, user->value - 1), 1666 sym_name(p, SYM_ROLES, bit), 1667 sym_name(p, SYM_USERS, upper->value - 1)); 1668 1669 return -EINVAL; 1670 } 1671 } 1672 1673 return 0; 1674 } 1675 1676 static int role_bounds_sanity_check(void *key, void *datum, void *datap) 1677 { 1678 struct role_datum *upper, *role; 1679 struct policydb *p = datap; 1680 int depth = 0; 1681 1682 upper = role = datum; 1683 while (upper->bounds) { 1684 struct ebitmap_node *node; 1685 unsigned long bit; 1686 1687 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) { 1688 pr_err("SELinux: role %s: " 1689 "too deep or looped bounds\n", 1690 (char *) key); 1691 return -EINVAL; 1692 } 1693 1694 upper = p->role_val_to_struct[upper->bounds - 1]; 1695 ebitmap_for_each_positive_bit(&role->types, node, bit) { 1696 if (ebitmap_get_bit(&upper->types, bit)) 1697 continue; 1698 1699 pr_err("SELinux: boundary violated policy: " 1700 "role=%s type=%s bounds=%s\n", 1701 sym_name(p, SYM_ROLES, role->value - 1), 1702 sym_name(p, SYM_TYPES, bit), 1703 sym_name(p, SYM_ROLES, upper->value - 1)); 1704 1705 return -EINVAL; 1706 } 1707 } 1708 1709 return 0; 1710 } 1711 1712 static int type_bounds_sanity_check(void *key, void *datum, void *datap) 1713 { 1714 struct type_datum *upper; 1715 struct policydb *p = datap; 1716 int depth = 0; 1717 1718 upper = datum; 1719 while (upper->bounds) { 1720 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) { 1721 pr_err("SELinux: type %s: " 1722 "too deep or looped boundary\n", 1723 (char *) key); 1724 return -EINVAL; 1725 } 1726 1727 upper = p->type_val_to_struct[upper->bounds - 1]; 1728 BUG_ON(!upper); 1729 1730 if (upper->attribute) { 1731 pr_err("SELinux: type %s: " 1732 "bounded by attribute %s", 1733 (char *) key, 1734 sym_name(p, SYM_TYPES, upper->value - 1)); 1735 return -EINVAL; 1736 } 1737 } 1738 1739 return 0; 1740 } 1741 1742 static int policydb_bounds_sanity_check(struct policydb *p) 1743 { 1744 int rc; 1745 1746 if (p->policyvers < POLICYDB_VERSION_BOUNDARY) 1747 return 0; 1748 1749 rc = hashtab_map(p->p_users.table, 1750 user_bounds_sanity_check, p); 1751 if (rc) 1752 return rc; 1753 1754 rc = hashtab_map(p->p_roles.table, 1755 role_bounds_sanity_check, p); 1756 if (rc) 1757 return rc; 1758 1759 rc = hashtab_map(p->p_types.table, 1760 type_bounds_sanity_check, p); 1761 if (rc) 1762 return rc; 1763 1764 return 0; 1765 } 1766 1767 u16 string_to_security_class(struct policydb *p, const char *name) 1768 { 1769 struct class_datum *cladatum; 1770 1771 cladatum = hashtab_search(p->p_classes.table, name); 1772 if (!cladatum) 1773 return 0; 1774 1775 return cladatum->value; 1776 } 1777 1778 u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name) 1779 { 1780 struct class_datum *cladatum; 1781 struct perm_datum *perdatum = NULL; 1782 struct common_datum *comdatum; 1783 1784 if (!tclass || tclass > p->p_classes.nprim) 1785 return 0; 1786 1787 cladatum = p->class_val_to_struct[tclass-1]; 1788 comdatum = cladatum->comdatum; 1789 if (comdatum) 1790 perdatum = hashtab_search(comdatum->permissions.table, 1791 name); 1792 if (!perdatum) 1793 perdatum = hashtab_search(cladatum->permissions.table, 1794 name); 1795 if (!perdatum) 1796 return 0; 1797 1798 return 1U << (perdatum->value-1); 1799 } 1800 1801 static int range_read(struct policydb *p, void *fp) 1802 { 1803 struct range_trans *rt = NULL; 1804 struct mls_range *r = NULL; 1805 int i, rc; 1806 __le32 buf[2]; 1807 u32 nel; 1808 1809 if (p->policyvers < POLICYDB_VERSION_MLS) 1810 return 0; 1811 1812 rc = next_entry(buf, fp, sizeof(u32)); 1813 if (rc) 1814 return rc; 1815 1816 nel = le32_to_cpu(buf[0]); 1817 for (i = 0; i < nel; i++) { 1818 rc = -ENOMEM; 1819 rt = kzalloc(sizeof(*rt), GFP_KERNEL); 1820 if (!rt) 1821 goto out; 1822 1823 rc = next_entry(buf, fp, (sizeof(u32) * 2)); 1824 if (rc) 1825 goto out; 1826 1827 rt->source_type = le32_to_cpu(buf[0]); 1828 rt->target_type = le32_to_cpu(buf[1]); 1829 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) { 1830 rc = next_entry(buf, fp, sizeof(u32)); 1831 if (rc) 1832 goto out; 1833 rt->target_class = le32_to_cpu(buf[0]); 1834 } else 1835 rt->target_class = p->process_class; 1836 1837 rc = -EINVAL; 1838 if (!policydb_type_isvalid(p, rt->source_type) || 1839 !policydb_type_isvalid(p, rt->target_type) || 1840 !policydb_class_isvalid(p, rt->target_class)) 1841 goto out; 1842 1843 rc = -ENOMEM; 1844 r = kzalloc(sizeof(*r), GFP_KERNEL); 1845 if (!r) 1846 goto out; 1847 1848 rc = mls_read_range_helper(r, fp); 1849 if (rc) 1850 goto out; 1851 1852 rc = -EINVAL; 1853 if (!mls_range_isvalid(p, r)) { 1854 pr_warn("SELinux: rangetrans: invalid range\n"); 1855 goto out; 1856 } 1857 1858 rc = hashtab_insert(p->range_tr, rt, r); 1859 if (rc) 1860 goto out; 1861 1862 rt = NULL; 1863 r = NULL; 1864 } 1865 hash_eval(p->range_tr, "rangetr"); 1866 rc = 0; 1867 out: 1868 kfree(rt); 1869 kfree(r); 1870 return rc; 1871 } 1872 1873 static int filename_trans_read(struct policydb *p, void *fp) 1874 { 1875 struct filename_trans *ft; 1876 struct filename_trans_datum *otype; 1877 char *name; 1878 u32 nel, len; 1879 __le32 buf[4]; 1880 int rc, i; 1881 1882 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS) 1883 return 0; 1884 1885 rc = next_entry(buf, fp, sizeof(u32)); 1886 if (rc) 1887 return rc; 1888 nel = le32_to_cpu(buf[0]); 1889 1890 for (i = 0; i < nel; i++) { 1891 otype = NULL; 1892 name = NULL; 1893 1894 rc = -ENOMEM; 1895 ft = kzalloc(sizeof(*ft), GFP_KERNEL); 1896 if (!ft) 1897 goto out; 1898 1899 rc = -ENOMEM; 1900 otype = kmalloc(sizeof(*otype), GFP_KERNEL); 1901 if (!otype) 1902 goto out; 1903 1904 /* length of the path component string */ 1905 rc = next_entry(buf, fp, sizeof(u32)); 1906 if (rc) 1907 goto out; 1908 len = le32_to_cpu(buf[0]); 1909 1910 /* path component string */ 1911 rc = str_read(&name, GFP_KERNEL, fp, len); 1912 if (rc) 1913 goto out; 1914 1915 ft->name = name; 1916 1917 rc = next_entry(buf, fp, sizeof(u32) * 4); 1918 if (rc) 1919 goto out; 1920 1921 ft->stype = le32_to_cpu(buf[0]); 1922 ft->ttype = le32_to_cpu(buf[1]); 1923 ft->tclass = le32_to_cpu(buf[2]); 1924 1925 otype->otype = le32_to_cpu(buf[3]); 1926 1927 rc = ebitmap_set_bit(&p->filename_trans_ttypes, ft->ttype, 1); 1928 if (rc) 1929 goto out; 1930 1931 rc = hashtab_insert(p->filename_trans, ft, otype); 1932 if (rc) { 1933 /* 1934 * Do not return -EEXIST to the caller, or the system 1935 * will not boot. 1936 */ 1937 if (rc != -EEXIST) 1938 goto out; 1939 /* But free memory to avoid memory leak. */ 1940 kfree(ft); 1941 kfree(name); 1942 kfree(otype); 1943 } 1944 } 1945 hash_eval(p->filename_trans, "filenametr"); 1946 return 0; 1947 out: 1948 kfree(ft); 1949 kfree(name); 1950 kfree(otype); 1951 1952 return rc; 1953 } 1954 1955 static int genfs_read(struct policydb *p, void *fp) 1956 { 1957 int i, j, rc; 1958 u32 nel, nel2, len, len2; 1959 __le32 buf[1]; 1960 struct ocontext *l, *c; 1961 struct ocontext *newc = NULL; 1962 struct genfs *genfs_p, *genfs; 1963 struct genfs *newgenfs = NULL; 1964 1965 rc = next_entry(buf, fp, sizeof(u32)); 1966 if (rc) 1967 return rc; 1968 nel = le32_to_cpu(buf[0]); 1969 1970 for (i = 0; i < nel; i++) { 1971 rc = next_entry(buf, fp, sizeof(u32)); 1972 if (rc) 1973 goto out; 1974 len = le32_to_cpu(buf[0]); 1975 1976 rc = -ENOMEM; 1977 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL); 1978 if (!newgenfs) 1979 goto out; 1980 1981 rc = str_read(&newgenfs->fstype, GFP_KERNEL, fp, len); 1982 if (rc) 1983 goto out; 1984 1985 for (genfs_p = NULL, genfs = p->genfs; genfs; 1986 genfs_p = genfs, genfs = genfs->next) { 1987 rc = -EINVAL; 1988 if (strcmp(newgenfs->fstype, genfs->fstype) == 0) { 1989 pr_err("SELinux: dup genfs fstype %s\n", 1990 newgenfs->fstype); 1991 goto out; 1992 } 1993 if (strcmp(newgenfs->fstype, genfs->fstype) < 0) 1994 break; 1995 } 1996 newgenfs->next = genfs; 1997 if (genfs_p) 1998 genfs_p->next = newgenfs; 1999 else 2000 p->genfs = newgenfs; 2001 genfs = newgenfs; 2002 newgenfs = NULL; 2003 2004 rc = next_entry(buf, fp, sizeof(u32)); 2005 if (rc) 2006 goto out; 2007 2008 nel2 = le32_to_cpu(buf[0]); 2009 for (j = 0; j < nel2; j++) { 2010 rc = next_entry(buf, fp, sizeof(u32)); 2011 if (rc) 2012 goto out; 2013 len = le32_to_cpu(buf[0]); 2014 2015 rc = -ENOMEM; 2016 newc = kzalloc(sizeof(*newc), GFP_KERNEL); 2017 if (!newc) 2018 goto out; 2019 2020 rc = str_read(&newc->u.name, GFP_KERNEL, fp, len); 2021 if (rc) 2022 goto out; 2023 2024 rc = next_entry(buf, fp, sizeof(u32)); 2025 if (rc) 2026 goto out; 2027 2028 newc->v.sclass = le32_to_cpu(buf[0]); 2029 rc = context_read_and_validate(&newc->context[0], p, fp); 2030 if (rc) 2031 goto out; 2032 2033 for (l = NULL, c = genfs->head; c; 2034 l = c, c = c->next) { 2035 rc = -EINVAL; 2036 if (!strcmp(newc->u.name, c->u.name) && 2037 (!c->v.sclass || !newc->v.sclass || 2038 newc->v.sclass == c->v.sclass)) { 2039 pr_err("SELinux: dup genfs entry (%s,%s)\n", 2040 genfs->fstype, c->u.name); 2041 goto out; 2042 } 2043 len = strlen(newc->u.name); 2044 len2 = strlen(c->u.name); 2045 if (len > len2) 2046 break; 2047 } 2048 2049 newc->next = c; 2050 if (l) 2051 l->next = newc; 2052 else 2053 genfs->head = newc; 2054 newc = NULL; 2055 } 2056 } 2057 rc = 0; 2058 out: 2059 if (newgenfs) { 2060 kfree(newgenfs->fstype); 2061 kfree(newgenfs); 2062 } 2063 ocontext_destroy(newc, OCON_FSUSE); 2064 2065 return rc; 2066 } 2067 2068 static int ocontext_read(struct policydb *p, struct policydb_compat_info *info, 2069 void *fp) 2070 { 2071 int i, j, rc; 2072 u32 nel, len; 2073 __be64 prefixbuf[1]; 2074 __le32 buf[3]; 2075 struct ocontext *l, *c; 2076 u32 nodebuf[8]; 2077 2078 for (i = 0; i < info->ocon_num; i++) { 2079 rc = next_entry(buf, fp, sizeof(u32)); 2080 if (rc) 2081 goto out; 2082 nel = le32_to_cpu(buf[0]); 2083 2084 l = NULL; 2085 for (j = 0; j < nel; j++) { 2086 rc = -ENOMEM; 2087 c = kzalloc(sizeof(*c), GFP_KERNEL); 2088 if (!c) 2089 goto out; 2090 if (l) 2091 l->next = c; 2092 else 2093 p->ocontexts[i] = c; 2094 l = c; 2095 2096 switch (i) { 2097 case OCON_ISID: 2098 rc = next_entry(buf, fp, sizeof(u32)); 2099 if (rc) 2100 goto out; 2101 2102 c->sid[0] = le32_to_cpu(buf[0]); 2103 rc = context_read_and_validate(&c->context[0], p, fp); 2104 if (rc) 2105 goto out; 2106 break; 2107 case OCON_FS: 2108 case OCON_NETIF: 2109 rc = next_entry(buf, fp, sizeof(u32)); 2110 if (rc) 2111 goto out; 2112 len = le32_to_cpu(buf[0]); 2113 2114 rc = str_read(&c->u.name, GFP_KERNEL, fp, len); 2115 if (rc) 2116 goto out; 2117 2118 rc = context_read_and_validate(&c->context[0], p, fp); 2119 if (rc) 2120 goto out; 2121 rc = context_read_and_validate(&c->context[1], p, fp); 2122 if (rc) 2123 goto out; 2124 break; 2125 case OCON_PORT: 2126 rc = next_entry(buf, fp, sizeof(u32)*3); 2127 if (rc) 2128 goto out; 2129 c->u.port.protocol = le32_to_cpu(buf[0]); 2130 c->u.port.low_port = le32_to_cpu(buf[1]); 2131 c->u.port.high_port = le32_to_cpu(buf[2]); 2132 rc = context_read_and_validate(&c->context[0], p, fp); 2133 if (rc) 2134 goto out; 2135 break; 2136 case OCON_NODE: 2137 rc = next_entry(nodebuf, fp, sizeof(u32) * 2); 2138 if (rc) 2139 goto out; 2140 c->u.node.addr = nodebuf[0]; /* network order */ 2141 c->u.node.mask = nodebuf[1]; /* network order */ 2142 rc = context_read_and_validate(&c->context[0], p, fp); 2143 if (rc) 2144 goto out; 2145 break; 2146 case OCON_FSUSE: 2147 rc = next_entry(buf, fp, sizeof(u32)*2); 2148 if (rc) 2149 goto out; 2150 2151 rc = -EINVAL; 2152 c->v.behavior = le32_to_cpu(buf[0]); 2153 /* Determined at runtime, not in policy DB. */ 2154 if (c->v.behavior == SECURITY_FS_USE_MNTPOINT) 2155 goto out; 2156 if (c->v.behavior > SECURITY_FS_USE_MAX) 2157 goto out; 2158 2159 len = le32_to_cpu(buf[1]); 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 break; 2168 case OCON_NODE6: { 2169 int k; 2170 2171 rc = next_entry(nodebuf, fp, sizeof(u32) * 8); 2172 if (rc) 2173 goto out; 2174 for (k = 0; k < 4; k++) 2175 c->u.node6.addr[k] = nodebuf[k]; 2176 for (k = 0; k < 4; k++) 2177 c->u.node6.mask[k] = nodebuf[k+4]; 2178 rc = context_read_and_validate(&c->context[0], p, fp); 2179 if (rc) 2180 goto out; 2181 break; 2182 } 2183 case OCON_IBPKEY: { 2184 u32 pkey_lo, pkey_hi; 2185 2186 rc = next_entry(prefixbuf, fp, sizeof(u64)); 2187 if (rc) 2188 goto out; 2189 2190 /* we need to have subnet_prefix in CPU order */ 2191 c->u.ibpkey.subnet_prefix = be64_to_cpu(prefixbuf[0]); 2192 2193 rc = next_entry(buf, fp, sizeof(u32) * 2); 2194 if (rc) 2195 goto out; 2196 2197 pkey_lo = le32_to_cpu(buf[0]); 2198 pkey_hi = le32_to_cpu(buf[1]); 2199 2200 if (pkey_lo > U16_MAX || pkey_hi > U16_MAX) { 2201 rc = -EINVAL; 2202 goto out; 2203 } 2204 2205 c->u.ibpkey.low_pkey = pkey_lo; 2206 c->u.ibpkey.high_pkey = pkey_hi; 2207 2208 rc = context_read_and_validate(&c->context[0], 2209 p, 2210 fp); 2211 if (rc) 2212 goto out; 2213 break; 2214 } 2215 case OCON_IBENDPORT: { 2216 u32 port; 2217 2218 rc = next_entry(buf, fp, sizeof(u32) * 2); 2219 if (rc) 2220 goto out; 2221 len = le32_to_cpu(buf[0]); 2222 2223 rc = str_read(&c->u.ibendport.dev_name, GFP_KERNEL, fp, len); 2224 if (rc) 2225 goto out; 2226 2227 port = le32_to_cpu(buf[1]); 2228 if (port > U8_MAX || port == 0) { 2229 rc = -EINVAL; 2230 goto out; 2231 } 2232 2233 c->u.ibendport.port = port; 2234 2235 rc = context_read_and_validate(&c->context[0], 2236 p, 2237 fp); 2238 if (rc) 2239 goto out; 2240 break; 2241 } /* end case */ 2242 } /* end switch */ 2243 } 2244 } 2245 rc = 0; 2246 out: 2247 return rc; 2248 } 2249 2250 /* 2251 * Read the configuration data from a policy database binary 2252 * representation file into a policy database structure. 2253 */ 2254 int policydb_read(struct policydb *p, void *fp) 2255 { 2256 struct role_allow *ra, *lra; 2257 struct role_trans *tr, *ltr; 2258 int i, j, rc; 2259 __le32 buf[4]; 2260 u32 len, nprim, nel; 2261 2262 char *policydb_str; 2263 struct policydb_compat_info *info; 2264 2265 rc = policydb_init(p); 2266 if (rc) 2267 return rc; 2268 2269 /* Read the magic number and string length. */ 2270 rc = next_entry(buf, fp, sizeof(u32) * 2); 2271 if (rc) 2272 goto bad; 2273 2274 rc = -EINVAL; 2275 if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) { 2276 pr_err("SELinux: policydb magic number 0x%x does " 2277 "not match expected magic number 0x%x\n", 2278 le32_to_cpu(buf[0]), POLICYDB_MAGIC); 2279 goto bad; 2280 } 2281 2282 rc = -EINVAL; 2283 len = le32_to_cpu(buf[1]); 2284 if (len != strlen(POLICYDB_STRING)) { 2285 pr_err("SELinux: policydb string length %d does not " 2286 "match expected length %zu\n", 2287 len, strlen(POLICYDB_STRING)); 2288 goto bad; 2289 } 2290 2291 rc = -ENOMEM; 2292 policydb_str = kmalloc(len + 1, GFP_KERNEL); 2293 if (!policydb_str) { 2294 pr_err("SELinux: unable to allocate memory for policydb " 2295 "string of length %d\n", len); 2296 goto bad; 2297 } 2298 2299 rc = next_entry(policydb_str, fp, len); 2300 if (rc) { 2301 pr_err("SELinux: truncated policydb string identifier\n"); 2302 kfree(policydb_str); 2303 goto bad; 2304 } 2305 2306 rc = -EINVAL; 2307 policydb_str[len] = '\0'; 2308 if (strcmp(policydb_str, POLICYDB_STRING)) { 2309 pr_err("SELinux: policydb string %s does not match " 2310 "my string %s\n", policydb_str, POLICYDB_STRING); 2311 kfree(policydb_str); 2312 goto bad; 2313 } 2314 /* Done with policydb_str. */ 2315 kfree(policydb_str); 2316 policydb_str = NULL; 2317 2318 /* Read the version and table sizes. */ 2319 rc = next_entry(buf, fp, sizeof(u32)*4); 2320 if (rc) 2321 goto bad; 2322 2323 rc = -EINVAL; 2324 p->policyvers = le32_to_cpu(buf[0]); 2325 if (p->policyvers < POLICYDB_VERSION_MIN || 2326 p->policyvers > POLICYDB_VERSION_MAX) { 2327 pr_err("SELinux: policydb version %d does not match " 2328 "my version range %d-%d\n", 2329 le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX); 2330 goto bad; 2331 } 2332 2333 if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) { 2334 p->mls_enabled = 1; 2335 2336 rc = -EINVAL; 2337 if (p->policyvers < POLICYDB_VERSION_MLS) { 2338 pr_err("SELinux: security policydb version %d " 2339 "(MLS) not backwards compatible\n", 2340 p->policyvers); 2341 goto bad; 2342 } 2343 } 2344 p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN); 2345 p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN); 2346 2347 if (p->policyvers >= POLICYDB_VERSION_POLCAP) { 2348 rc = ebitmap_read(&p->policycaps, fp); 2349 if (rc) 2350 goto bad; 2351 } 2352 2353 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) { 2354 rc = ebitmap_read(&p->permissive_map, fp); 2355 if (rc) 2356 goto bad; 2357 } 2358 2359 rc = -EINVAL; 2360 info = policydb_lookup_compat(p->policyvers); 2361 if (!info) { 2362 pr_err("SELinux: unable to find policy compat info " 2363 "for version %d\n", p->policyvers); 2364 goto bad; 2365 } 2366 2367 rc = -EINVAL; 2368 if (le32_to_cpu(buf[2]) != info->sym_num || 2369 le32_to_cpu(buf[3]) != info->ocon_num) { 2370 pr_err("SELinux: policydb table sizes (%d,%d) do " 2371 "not match mine (%d,%d)\n", le32_to_cpu(buf[2]), 2372 le32_to_cpu(buf[3]), 2373 info->sym_num, info->ocon_num); 2374 goto bad; 2375 } 2376 2377 for (i = 0; i < info->sym_num; i++) { 2378 rc = next_entry(buf, fp, sizeof(u32)*2); 2379 if (rc) 2380 goto bad; 2381 nprim = le32_to_cpu(buf[0]); 2382 nel = le32_to_cpu(buf[1]); 2383 for (j = 0; j < nel; j++) { 2384 rc = read_f[i](p, p->symtab[i].table, fp); 2385 if (rc) 2386 goto bad; 2387 } 2388 2389 p->symtab[i].nprim = nprim; 2390 } 2391 2392 rc = -EINVAL; 2393 p->process_class = string_to_security_class(p, "process"); 2394 if (!p->process_class) 2395 goto bad; 2396 2397 rc = avtab_read(&p->te_avtab, fp, p); 2398 if (rc) 2399 goto bad; 2400 2401 if (p->policyvers >= POLICYDB_VERSION_BOOL) { 2402 rc = cond_read_list(p, fp); 2403 if (rc) 2404 goto bad; 2405 } 2406 2407 rc = next_entry(buf, fp, sizeof(u32)); 2408 if (rc) 2409 goto bad; 2410 nel = le32_to_cpu(buf[0]); 2411 ltr = NULL; 2412 for (i = 0; i < nel; i++) { 2413 rc = -ENOMEM; 2414 tr = kzalloc(sizeof(*tr), GFP_KERNEL); 2415 if (!tr) 2416 goto bad; 2417 if (ltr) 2418 ltr->next = tr; 2419 else 2420 p->role_tr = tr; 2421 rc = next_entry(buf, fp, sizeof(u32)*3); 2422 if (rc) 2423 goto bad; 2424 2425 rc = -EINVAL; 2426 tr->role = le32_to_cpu(buf[0]); 2427 tr->type = le32_to_cpu(buf[1]); 2428 tr->new_role = le32_to_cpu(buf[2]); 2429 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) { 2430 rc = next_entry(buf, fp, sizeof(u32)); 2431 if (rc) 2432 goto bad; 2433 tr->tclass = le32_to_cpu(buf[0]); 2434 } else 2435 tr->tclass = p->process_class; 2436 2437 rc = -EINVAL; 2438 if (!policydb_role_isvalid(p, tr->role) || 2439 !policydb_type_isvalid(p, tr->type) || 2440 !policydb_class_isvalid(p, tr->tclass) || 2441 !policydb_role_isvalid(p, tr->new_role)) 2442 goto bad; 2443 ltr = tr; 2444 } 2445 2446 rc = next_entry(buf, fp, sizeof(u32)); 2447 if (rc) 2448 goto bad; 2449 nel = le32_to_cpu(buf[0]); 2450 lra = NULL; 2451 for (i = 0; i < nel; i++) { 2452 rc = -ENOMEM; 2453 ra = kzalloc(sizeof(*ra), GFP_KERNEL); 2454 if (!ra) 2455 goto bad; 2456 if (lra) 2457 lra->next = ra; 2458 else 2459 p->role_allow = ra; 2460 rc = next_entry(buf, fp, sizeof(u32)*2); 2461 if (rc) 2462 goto bad; 2463 2464 rc = -EINVAL; 2465 ra->role = le32_to_cpu(buf[0]); 2466 ra->new_role = le32_to_cpu(buf[1]); 2467 if (!policydb_role_isvalid(p, ra->role) || 2468 !policydb_role_isvalid(p, ra->new_role)) 2469 goto bad; 2470 lra = ra; 2471 } 2472 2473 rc = filename_trans_read(p, fp); 2474 if (rc) 2475 goto bad; 2476 2477 rc = policydb_index(p); 2478 if (rc) 2479 goto bad; 2480 2481 rc = -EINVAL; 2482 p->process_trans_perms = string_to_av_perm(p, p->process_class, "transition"); 2483 p->process_trans_perms |= string_to_av_perm(p, p->process_class, "dyntransition"); 2484 if (!p->process_trans_perms) 2485 goto bad; 2486 2487 rc = ocontext_read(p, info, fp); 2488 if (rc) 2489 goto bad; 2490 2491 rc = genfs_read(p, fp); 2492 if (rc) 2493 goto bad; 2494 2495 rc = range_read(p, fp); 2496 if (rc) 2497 goto bad; 2498 2499 p->type_attr_map_array = kvcalloc(p->p_types.nprim, 2500 sizeof(*p->type_attr_map_array), 2501 GFP_KERNEL); 2502 if (!p->type_attr_map_array) 2503 goto bad; 2504 2505 /* just in case ebitmap_init() becomes more than just a memset(0): */ 2506 for (i = 0; i < p->p_types.nprim; i++) 2507 ebitmap_init(&p->type_attr_map_array[i]); 2508 2509 for (i = 0; i < p->p_types.nprim; i++) { 2510 struct ebitmap *e = &p->type_attr_map_array[i]; 2511 2512 if (p->policyvers >= POLICYDB_VERSION_AVTAB) { 2513 rc = ebitmap_read(e, fp); 2514 if (rc) 2515 goto bad; 2516 } 2517 /* add the type itself as the degenerate case */ 2518 rc = ebitmap_set_bit(e, i, 1); 2519 if (rc) 2520 goto bad; 2521 } 2522 2523 rc = policydb_bounds_sanity_check(p); 2524 if (rc) 2525 goto bad; 2526 2527 rc = 0; 2528 out: 2529 return rc; 2530 bad: 2531 policydb_destroy(p); 2532 goto out; 2533 } 2534 2535 /* 2536 * Write a MLS level structure to a policydb binary 2537 * representation file. 2538 */ 2539 static int mls_write_level(struct mls_level *l, void *fp) 2540 { 2541 __le32 buf[1]; 2542 int rc; 2543 2544 buf[0] = cpu_to_le32(l->sens); 2545 rc = put_entry(buf, sizeof(u32), 1, fp); 2546 if (rc) 2547 return rc; 2548 2549 rc = ebitmap_write(&l->cat, fp); 2550 if (rc) 2551 return rc; 2552 2553 return 0; 2554 } 2555 2556 /* 2557 * Write a MLS range structure to a policydb binary 2558 * representation file. 2559 */ 2560 static int mls_write_range_helper(struct mls_range *r, void *fp) 2561 { 2562 __le32 buf[3]; 2563 size_t items; 2564 int rc, eq; 2565 2566 eq = mls_level_eq(&r->level[1], &r->level[0]); 2567 2568 if (eq) 2569 items = 2; 2570 else 2571 items = 3; 2572 buf[0] = cpu_to_le32(items-1); 2573 buf[1] = cpu_to_le32(r->level[0].sens); 2574 if (!eq) 2575 buf[2] = cpu_to_le32(r->level[1].sens); 2576 2577 BUG_ON(items > ARRAY_SIZE(buf)); 2578 2579 rc = put_entry(buf, sizeof(u32), items, fp); 2580 if (rc) 2581 return rc; 2582 2583 rc = ebitmap_write(&r->level[0].cat, fp); 2584 if (rc) 2585 return rc; 2586 if (!eq) { 2587 rc = ebitmap_write(&r->level[1].cat, fp); 2588 if (rc) 2589 return rc; 2590 } 2591 2592 return 0; 2593 } 2594 2595 static int sens_write(void *vkey, void *datum, void *ptr) 2596 { 2597 char *key = vkey; 2598 struct level_datum *levdatum = datum; 2599 struct policy_data *pd = ptr; 2600 void *fp = pd->fp; 2601 __le32 buf[2]; 2602 size_t len; 2603 int rc; 2604 2605 len = strlen(key); 2606 buf[0] = cpu_to_le32(len); 2607 buf[1] = cpu_to_le32(levdatum->isalias); 2608 rc = put_entry(buf, sizeof(u32), 2, fp); 2609 if (rc) 2610 return rc; 2611 2612 rc = put_entry(key, 1, len, fp); 2613 if (rc) 2614 return rc; 2615 2616 rc = mls_write_level(levdatum->level, fp); 2617 if (rc) 2618 return rc; 2619 2620 return 0; 2621 } 2622 2623 static int cat_write(void *vkey, void *datum, void *ptr) 2624 { 2625 char *key = vkey; 2626 struct cat_datum *catdatum = datum; 2627 struct policy_data *pd = ptr; 2628 void *fp = pd->fp; 2629 __le32 buf[3]; 2630 size_t len; 2631 int rc; 2632 2633 len = strlen(key); 2634 buf[0] = cpu_to_le32(len); 2635 buf[1] = cpu_to_le32(catdatum->value); 2636 buf[2] = cpu_to_le32(catdatum->isalias); 2637 rc = put_entry(buf, sizeof(u32), 3, fp); 2638 if (rc) 2639 return rc; 2640 2641 rc = put_entry(key, 1, len, fp); 2642 if (rc) 2643 return rc; 2644 2645 return 0; 2646 } 2647 2648 static int role_trans_write(struct policydb *p, void *fp) 2649 { 2650 struct role_trans *r = p->role_tr; 2651 struct role_trans *tr; 2652 u32 buf[3]; 2653 size_t nel; 2654 int rc; 2655 2656 nel = 0; 2657 for (tr = r; tr; tr = tr->next) 2658 nel++; 2659 buf[0] = cpu_to_le32(nel); 2660 rc = put_entry(buf, sizeof(u32), 1, fp); 2661 if (rc) 2662 return rc; 2663 for (tr = r; tr; tr = tr->next) { 2664 buf[0] = cpu_to_le32(tr->role); 2665 buf[1] = cpu_to_le32(tr->type); 2666 buf[2] = cpu_to_le32(tr->new_role); 2667 rc = put_entry(buf, sizeof(u32), 3, fp); 2668 if (rc) 2669 return rc; 2670 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) { 2671 buf[0] = cpu_to_le32(tr->tclass); 2672 rc = put_entry(buf, sizeof(u32), 1, fp); 2673 if (rc) 2674 return rc; 2675 } 2676 } 2677 2678 return 0; 2679 } 2680 2681 static int role_allow_write(struct role_allow *r, void *fp) 2682 { 2683 struct role_allow *ra; 2684 u32 buf[2]; 2685 size_t nel; 2686 int rc; 2687 2688 nel = 0; 2689 for (ra = r; ra; ra = ra->next) 2690 nel++; 2691 buf[0] = cpu_to_le32(nel); 2692 rc = put_entry(buf, sizeof(u32), 1, fp); 2693 if (rc) 2694 return rc; 2695 for (ra = r; ra; ra = ra->next) { 2696 buf[0] = cpu_to_le32(ra->role); 2697 buf[1] = cpu_to_le32(ra->new_role); 2698 rc = put_entry(buf, sizeof(u32), 2, fp); 2699 if (rc) 2700 return rc; 2701 } 2702 return 0; 2703 } 2704 2705 /* 2706 * Write a security context structure 2707 * to a policydb binary representation file. 2708 */ 2709 static int context_write(struct policydb *p, struct context *c, 2710 void *fp) 2711 { 2712 int rc; 2713 __le32 buf[3]; 2714 2715 buf[0] = cpu_to_le32(c->user); 2716 buf[1] = cpu_to_le32(c->role); 2717 buf[2] = cpu_to_le32(c->type); 2718 2719 rc = put_entry(buf, sizeof(u32), 3, fp); 2720 if (rc) 2721 return rc; 2722 2723 rc = mls_write_range_helper(&c->range, fp); 2724 if (rc) 2725 return rc; 2726 2727 return 0; 2728 } 2729 2730 /* 2731 * The following *_write functions are used to 2732 * write the symbol data to a policy database 2733 * binary representation file. 2734 */ 2735 2736 static int perm_write(void *vkey, void *datum, void *fp) 2737 { 2738 char *key = vkey; 2739 struct perm_datum *perdatum = datum; 2740 __le32 buf[2]; 2741 size_t len; 2742 int rc; 2743 2744 len = strlen(key); 2745 buf[0] = cpu_to_le32(len); 2746 buf[1] = cpu_to_le32(perdatum->value); 2747 rc = put_entry(buf, sizeof(u32), 2, fp); 2748 if (rc) 2749 return rc; 2750 2751 rc = put_entry(key, 1, len, fp); 2752 if (rc) 2753 return rc; 2754 2755 return 0; 2756 } 2757 2758 static int common_write(void *vkey, void *datum, void *ptr) 2759 { 2760 char *key = vkey; 2761 struct common_datum *comdatum = datum; 2762 struct policy_data *pd = ptr; 2763 void *fp = pd->fp; 2764 __le32 buf[4]; 2765 size_t len; 2766 int rc; 2767 2768 len = strlen(key); 2769 buf[0] = cpu_to_le32(len); 2770 buf[1] = cpu_to_le32(comdatum->value); 2771 buf[2] = cpu_to_le32(comdatum->permissions.nprim); 2772 buf[3] = cpu_to_le32(comdatum->permissions.table->nel); 2773 rc = put_entry(buf, sizeof(u32), 4, fp); 2774 if (rc) 2775 return rc; 2776 2777 rc = put_entry(key, 1, len, fp); 2778 if (rc) 2779 return rc; 2780 2781 rc = hashtab_map(comdatum->permissions.table, perm_write, fp); 2782 if (rc) 2783 return rc; 2784 2785 return 0; 2786 } 2787 2788 static int type_set_write(struct type_set *t, void *fp) 2789 { 2790 int rc; 2791 __le32 buf[1]; 2792 2793 if (ebitmap_write(&t->types, fp)) 2794 return -EINVAL; 2795 if (ebitmap_write(&t->negset, fp)) 2796 return -EINVAL; 2797 2798 buf[0] = cpu_to_le32(t->flags); 2799 rc = put_entry(buf, sizeof(u32), 1, fp); 2800 if (rc) 2801 return -EINVAL; 2802 2803 return 0; 2804 } 2805 2806 static int write_cons_helper(struct policydb *p, struct constraint_node *node, 2807 void *fp) 2808 { 2809 struct constraint_node *c; 2810 struct constraint_expr *e; 2811 __le32 buf[3]; 2812 u32 nel; 2813 int rc; 2814 2815 for (c = node; c; c = c->next) { 2816 nel = 0; 2817 for (e = c->expr; e; e = e->next) 2818 nel++; 2819 buf[0] = cpu_to_le32(c->permissions); 2820 buf[1] = cpu_to_le32(nel); 2821 rc = put_entry(buf, sizeof(u32), 2, fp); 2822 if (rc) 2823 return rc; 2824 for (e = c->expr; e; e = e->next) { 2825 buf[0] = cpu_to_le32(e->expr_type); 2826 buf[1] = cpu_to_le32(e->attr); 2827 buf[2] = cpu_to_le32(e->op); 2828 rc = put_entry(buf, sizeof(u32), 3, fp); 2829 if (rc) 2830 return rc; 2831 2832 switch (e->expr_type) { 2833 case CEXPR_NAMES: 2834 rc = ebitmap_write(&e->names, fp); 2835 if (rc) 2836 return rc; 2837 if (p->policyvers >= 2838 POLICYDB_VERSION_CONSTRAINT_NAMES) { 2839 rc = type_set_write(e->type_names, fp); 2840 if (rc) 2841 return rc; 2842 } 2843 break; 2844 default: 2845 break; 2846 } 2847 } 2848 } 2849 2850 return 0; 2851 } 2852 2853 static int class_write(void *vkey, void *datum, void *ptr) 2854 { 2855 char *key = vkey; 2856 struct class_datum *cladatum = datum; 2857 struct policy_data *pd = ptr; 2858 void *fp = pd->fp; 2859 struct policydb *p = pd->p; 2860 struct constraint_node *c; 2861 __le32 buf[6]; 2862 u32 ncons; 2863 size_t len, len2; 2864 int rc; 2865 2866 len = strlen(key); 2867 if (cladatum->comkey) 2868 len2 = strlen(cladatum->comkey); 2869 else 2870 len2 = 0; 2871 2872 ncons = 0; 2873 for (c = cladatum->constraints; c; c = c->next) 2874 ncons++; 2875 2876 buf[0] = cpu_to_le32(len); 2877 buf[1] = cpu_to_le32(len2); 2878 buf[2] = cpu_to_le32(cladatum->value); 2879 buf[3] = cpu_to_le32(cladatum->permissions.nprim); 2880 if (cladatum->permissions.table) 2881 buf[4] = cpu_to_le32(cladatum->permissions.table->nel); 2882 else 2883 buf[4] = 0; 2884 buf[5] = cpu_to_le32(ncons); 2885 rc = put_entry(buf, sizeof(u32), 6, fp); 2886 if (rc) 2887 return rc; 2888 2889 rc = put_entry(key, 1, len, fp); 2890 if (rc) 2891 return rc; 2892 2893 if (cladatum->comkey) { 2894 rc = put_entry(cladatum->comkey, 1, len2, fp); 2895 if (rc) 2896 return rc; 2897 } 2898 2899 rc = hashtab_map(cladatum->permissions.table, perm_write, fp); 2900 if (rc) 2901 return rc; 2902 2903 rc = write_cons_helper(p, cladatum->constraints, fp); 2904 if (rc) 2905 return rc; 2906 2907 /* write out the validatetrans rule */ 2908 ncons = 0; 2909 for (c = cladatum->validatetrans; c; c = c->next) 2910 ncons++; 2911 2912 buf[0] = cpu_to_le32(ncons); 2913 rc = put_entry(buf, sizeof(u32), 1, fp); 2914 if (rc) 2915 return rc; 2916 2917 rc = write_cons_helper(p, cladatum->validatetrans, fp); 2918 if (rc) 2919 return rc; 2920 2921 if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) { 2922 buf[0] = cpu_to_le32(cladatum->default_user); 2923 buf[1] = cpu_to_le32(cladatum->default_role); 2924 buf[2] = cpu_to_le32(cladatum->default_range); 2925 2926 rc = put_entry(buf, sizeof(uint32_t), 3, fp); 2927 if (rc) 2928 return rc; 2929 } 2930 2931 if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) { 2932 buf[0] = cpu_to_le32(cladatum->default_type); 2933 rc = put_entry(buf, sizeof(uint32_t), 1, fp); 2934 if (rc) 2935 return rc; 2936 } 2937 2938 return 0; 2939 } 2940 2941 static int role_write(void *vkey, void *datum, void *ptr) 2942 { 2943 char *key = vkey; 2944 struct role_datum *role = datum; 2945 struct policy_data *pd = ptr; 2946 void *fp = pd->fp; 2947 struct policydb *p = pd->p; 2948 __le32 buf[3]; 2949 size_t items, len; 2950 int rc; 2951 2952 len = strlen(key); 2953 items = 0; 2954 buf[items++] = cpu_to_le32(len); 2955 buf[items++] = cpu_to_le32(role->value); 2956 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) 2957 buf[items++] = cpu_to_le32(role->bounds); 2958 2959 BUG_ON(items > ARRAY_SIZE(buf)); 2960 2961 rc = put_entry(buf, sizeof(u32), items, fp); 2962 if (rc) 2963 return rc; 2964 2965 rc = put_entry(key, 1, len, fp); 2966 if (rc) 2967 return rc; 2968 2969 rc = ebitmap_write(&role->dominates, fp); 2970 if (rc) 2971 return rc; 2972 2973 rc = ebitmap_write(&role->types, fp); 2974 if (rc) 2975 return rc; 2976 2977 return 0; 2978 } 2979 2980 static int type_write(void *vkey, void *datum, void *ptr) 2981 { 2982 char *key = vkey; 2983 struct type_datum *typdatum = datum; 2984 struct policy_data *pd = ptr; 2985 struct policydb *p = pd->p; 2986 void *fp = pd->fp; 2987 __le32 buf[4]; 2988 int rc; 2989 size_t items, len; 2990 2991 len = strlen(key); 2992 items = 0; 2993 buf[items++] = cpu_to_le32(len); 2994 buf[items++] = cpu_to_le32(typdatum->value); 2995 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) { 2996 u32 properties = 0; 2997 2998 if (typdatum->primary) 2999 properties |= TYPEDATUM_PROPERTY_PRIMARY; 3000 3001 if (typdatum->attribute) 3002 properties |= TYPEDATUM_PROPERTY_ATTRIBUTE; 3003 3004 buf[items++] = cpu_to_le32(properties); 3005 buf[items++] = cpu_to_le32(typdatum->bounds); 3006 } else { 3007 buf[items++] = cpu_to_le32(typdatum->primary); 3008 } 3009 BUG_ON(items > ARRAY_SIZE(buf)); 3010 rc = put_entry(buf, sizeof(u32), items, fp); 3011 if (rc) 3012 return rc; 3013 3014 rc = put_entry(key, 1, len, fp); 3015 if (rc) 3016 return rc; 3017 3018 return 0; 3019 } 3020 3021 static int user_write(void *vkey, void *datum, void *ptr) 3022 { 3023 char *key = vkey; 3024 struct user_datum *usrdatum = datum; 3025 struct policy_data *pd = ptr; 3026 struct policydb *p = pd->p; 3027 void *fp = pd->fp; 3028 __le32 buf[3]; 3029 size_t items, len; 3030 int rc; 3031 3032 len = strlen(key); 3033 items = 0; 3034 buf[items++] = cpu_to_le32(len); 3035 buf[items++] = cpu_to_le32(usrdatum->value); 3036 if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) 3037 buf[items++] = cpu_to_le32(usrdatum->bounds); 3038 BUG_ON(items > ARRAY_SIZE(buf)); 3039 rc = put_entry(buf, sizeof(u32), items, fp); 3040 if (rc) 3041 return rc; 3042 3043 rc = put_entry(key, 1, len, fp); 3044 if (rc) 3045 return rc; 3046 3047 rc = ebitmap_write(&usrdatum->roles, fp); 3048 if (rc) 3049 return rc; 3050 3051 rc = mls_write_range_helper(&usrdatum->range, fp); 3052 if (rc) 3053 return rc; 3054 3055 rc = mls_write_level(&usrdatum->dfltlevel, fp); 3056 if (rc) 3057 return rc; 3058 3059 return 0; 3060 } 3061 3062 static int (*write_f[SYM_NUM]) (void *key, void *datum, 3063 void *datap) = 3064 { 3065 common_write, 3066 class_write, 3067 role_write, 3068 type_write, 3069 user_write, 3070 cond_write_bool, 3071 sens_write, 3072 cat_write, 3073 }; 3074 3075 static int ocontext_write(struct policydb *p, struct policydb_compat_info *info, 3076 void *fp) 3077 { 3078 unsigned int i, j, rc; 3079 size_t nel, len; 3080 __be64 prefixbuf[1]; 3081 __le32 buf[3]; 3082 u32 nodebuf[8]; 3083 struct ocontext *c; 3084 for (i = 0; i < info->ocon_num; i++) { 3085 nel = 0; 3086 for (c = p->ocontexts[i]; c; c = c->next) 3087 nel++; 3088 buf[0] = cpu_to_le32(nel); 3089 rc = put_entry(buf, sizeof(u32), 1, fp); 3090 if (rc) 3091 return rc; 3092 for (c = p->ocontexts[i]; c; c = c->next) { 3093 switch (i) { 3094 case OCON_ISID: 3095 buf[0] = cpu_to_le32(c->sid[0]); 3096 rc = put_entry(buf, sizeof(u32), 1, fp); 3097 if (rc) 3098 return rc; 3099 rc = context_write(p, &c->context[0], fp); 3100 if (rc) 3101 return rc; 3102 break; 3103 case OCON_FS: 3104 case OCON_NETIF: 3105 len = strlen(c->u.name); 3106 buf[0] = cpu_to_le32(len); 3107 rc = put_entry(buf, sizeof(u32), 1, fp); 3108 if (rc) 3109 return rc; 3110 rc = put_entry(c->u.name, 1, len, fp); 3111 if (rc) 3112 return rc; 3113 rc = context_write(p, &c->context[0], fp); 3114 if (rc) 3115 return rc; 3116 rc = context_write(p, &c->context[1], fp); 3117 if (rc) 3118 return rc; 3119 break; 3120 case OCON_PORT: 3121 buf[0] = cpu_to_le32(c->u.port.protocol); 3122 buf[1] = cpu_to_le32(c->u.port.low_port); 3123 buf[2] = cpu_to_le32(c->u.port.high_port); 3124 rc = put_entry(buf, sizeof(u32), 3, fp); 3125 if (rc) 3126 return rc; 3127 rc = context_write(p, &c->context[0], fp); 3128 if (rc) 3129 return rc; 3130 break; 3131 case OCON_NODE: 3132 nodebuf[0] = c->u.node.addr; /* network order */ 3133 nodebuf[1] = c->u.node.mask; /* network order */ 3134 rc = put_entry(nodebuf, sizeof(u32), 2, fp); 3135 if (rc) 3136 return rc; 3137 rc = context_write(p, &c->context[0], fp); 3138 if (rc) 3139 return rc; 3140 break; 3141 case OCON_FSUSE: 3142 buf[0] = cpu_to_le32(c->v.behavior); 3143 len = strlen(c->u.name); 3144 buf[1] = cpu_to_le32(len); 3145 rc = put_entry(buf, sizeof(u32), 2, fp); 3146 if (rc) 3147 return rc; 3148 rc = put_entry(c->u.name, 1, len, 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_NODE6: 3156 for (j = 0; j < 4; j++) 3157 nodebuf[j] = c->u.node6.addr[j]; /* network order */ 3158 for (j = 0; j < 4; j++) 3159 nodebuf[j + 4] = c->u.node6.mask[j]; /* network order */ 3160 rc = put_entry(nodebuf, sizeof(u32), 8, fp); 3161 if (rc) 3162 return rc; 3163 rc = context_write(p, &c->context[0], fp); 3164 if (rc) 3165 return rc; 3166 break; 3167 case OCON_IBPKEY: 3168 /* subnet_prefix is in CPU order */ 3169 prefixbuf[0] = cpu_to_be64(c->u.ibpkey.subnet_prefix); 3170 3171 rc = put_entry(prefixbuf, sizeof(u64), 1, fp); 3172 if (rc) 3173 return rc; 3174 3175 buf[0] = cpu_to_le32(c->u.ibpkey.low_pkey); 3176 buf[1] = cpu_to_le32(c->u.ibpkey.high_pkey); 3177 3178 rc = put_entry(buf, sizeof(u32), 2, fp); 3179 if (rc) 3180 return rc; 3181 rc = context_write(p, &c->context[0], fp); 3182 if (rc) 3183 return rc; 3184 break; 3185 case OCON_IBENDPORT: 3186 len = strlen(c->u.ibendport.dev_name); 3187 buf[0] = cpu_to_le32(len); 3188 buf[1] = cpu_to_le32(c->u.ibendport.port); 3189 rc = put_entry(buf, sizeof(u32), 2, fp); 3190 if (rc) 3191 return rc; 3192 rc = put_entry(c->u.ibendport.dev_name, 1, len, fp); 3193 if (rc) 3194 return rc; 3195 rc = context_write(p, &c->context[0], fp); 3196 if (rc) 3197 return rc; 3198 break; 3199 } 3200 } 3201 } 3202 return 0; 3203 } 3204 3205 static int genfs_write(struct policydb *p, void *fp) 3206 { 3207 struct genfs *genfs; 3208 struct ocontext *c; 3209 size_t len; 3210 __le32 buf[1]; 3211 int rc; 3212 3213 len = 0; 3214 for (genfs = p->genfs; genfs; genfs = genfs->next) 3215 len++; 3216 buf[0] = cpu_to_le32(len); 3217 rc = put_entry(buf, sizeof(u32), 1, fp); 3218 if (rc) 3219 return rc; 3220 for (genfs = p->genfs; genfs; genfs = genfs->next) { 3221 len = strlen(genfs->fstype); 3222 buf[0] = cpu_to_le32(len); 3223 rc = put_entry(buf, sizeof(u32), 1, fp); 3224 if (rc) 3225 return rc; 3226 rc = put_entry(genfs->fstype, 1, len, fp); 3227 if (rc) 3228 return rc; 3229 len = 0; 3230 for (c = genfs->head; c; c = c->next) 3231 len++; 3232 buf[0] = cpu_to_le32(len); 3233 rc = put_entry(buf, sizeof(u32), 1, fp); 3234 if (rc) 3235 return rc; 3236 for (c = genfs->head; c; c = c->next) { 3237 len = strlen(c->u.name); 3238 buf[0] = cpu_to_le32(len); 3239 rc = put_entry(buf, sizeof(u32), 1, fp); 3240 if (rc) 3241 return rc; 3242 rc = put_entry(c->u.name, 1, len, fp); 3243 if (rc) 3244 return rc; 3245 buf[0] = cpu_to_le32(c->v.sclass); 3246 rc = put_entry(buf, sizeof(u32), 1, fp); 3247 if (rc) 3248 return rc; 3249 rc = context_write(p, &c->context[0], fp); 3250 if (rc) 3251 return rc; 3252 } 3253 } 3254 return 0; 3255 } 3256 3257 static int hashtab_cnt(void *key, void *data, void *ptr) 3258 { 3259 int *cnt = ptr; 3260 *cnt = *cnt + 1; 3261 3262 return 0; 3263 } 3264 3265 static int range_write_helper(void *key, void *data, void *ptr) 3266 { 3267 __le32 buf[2]; 3268 struct range_trans *rt = key; 3269 struct mls_range *r = data; 3270 struct policy_data *pd = ptr; 3271 void *fp = pd->fp; 3272 struct policydb *p = pd->p; 3273 int rc; 3274 3275 buf[0] = cpu_to_le32(rt->source_type); 3276 buf[1] = cpu_to_le32(rt->target_type); 3277 rc = put_entry(buf, sizeof(u32), 2, fp); 3278 if (rc) 3279 return rc; 3280 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) { 3281 buf[0] = cpu_to_le32(rt->target_class); 3282 rc = put_entry(buf, sizeof(u32), 1, fp); 3283 if (rc) 3284 return rc; 3285 } 3286 rc = mls_write_range_helper(r, fp); 3287 if (rc) 3288 return rc; 3289 3290 return 0; 3291 } 3292 3293 static int range_write(struct policydb *p, void *fp) 3294 { 3295 __le32 buf[1]; 3296 int rc, nel; 3297 struct policy_data pd; 3298 3299 pd.p = p; 3300 pd.fp = fp; 3301 3302 /* count the number of entries in the hashtab */ 3303 nel = 0; 3304 rc = hashtab_map(p->range_tr, hashtab_cnt, &nel); 3305 if (rc) 3306 return rc; 3307 3308 buf[0] = cpu_to_le32(nel); 3309 rc = put_entry(buf, sizeof(u32), 1, fp); 3310 if (rc) 3311 return rc; 3312 3313 /* actually write all of the entries */ 3314 rc = hashtab_map(p->range_tr, range_write_helper, &pd); 3315 if (rc) 3316 return rc; 3317 3318 return 0; 3319 } 3320 3321 static int filename_write_helper(void *key, void *data, void *ptr) 3322 { 3323 __le32 buf[4]; 3324 struct filename_trans *ft = key; 3325 struct filename_trans_datum *otype = data; 3326 void *fp = ptr; 3327 int rc; 3328 u32 len; 3329 3330 len = strlen(ft->name); 3331 buf[0] = cpu_to_le32(len); 3332 rc = put_entry(buf, sizeof(u32), 1, fp); 3333 if (rc) 3334 return rc; 3335 3336 rc = put_entry(ft->name, sizeof(char), len, fp); 3337 if (rc) 3338 return rc; 3339 3340 buf[0] = cpu_to_le32(ft->stype); 3341 buf[1] = cpu_to_le32(ft->ttype); 3342 buf[2] = cpu_to_le32(ft->tclass); 3343 buf[3] = cpu_to_le32(otype->otype); 3344 3345 rc = put_entry(buf, sizeof(u32), 4, fp); 3346 if (rc) 3347 return rc; 3348 3349 return 0; 3350 } 3351 3352 static int filename_trans_write(struct policydb *p, void *fp) 3353 { 3354 u32 nel; 3355 __le32 buf[1]; 3356 int rc; 3357 3358 if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS) 3359 return 0; 3360 3361 nel = 0; 3362 rc = hashtab_map(p->filename_trans, hashtab_cnt, &nel); 3363 if (rc) 3364 return rc; 3365 3366 buf[0] = cpu_to_le32(nel); 3367 rc = put_entry(buf, sizeof(u32), 1, fp); 3368 if (rc) 3369 return rc; 3370 3371 rc = hashtab_map(p->filename_trans, filename_write_helper, fp); 3372 if (rc) 3373 return rc; 3374 3375 return 0; 3376 } 3377 3378 /* 3379 * Write the configuration data in a policy database 3380 * structure to a policy database binary representation 3381 * file. 3382 */ 3383 int policydb_write(struct policydb *p, void *fp) 3384 { 3385 unsigned int i, num_syms; 3386 int rc; 3387 __le32 buf[4]; 3388 u32 config; 3389 size_t len; 3390 struct policydb_compat_info *info; 3391 3392 /* 3393 * refuse to write policy older than compressed avtab 3394 * to simplify the writer. There are other tests dropped 3395 * since we assume this throughout the writer code. Be 3396 * careful if you ever try to remove this restriction 3397 */ 3398 if (p->policyvers < POLICYDB_VERSION_AVTAB) { 3399 pr_err("SELinux: refusing to write policy version %d." 3400 " Because it is less than version %d\n", p->policyvers, 3401 POLICYDB_VERSION_AVTAB); 3402 return -EINVAL; 3403 } 3404 3405 config = 0; 3406 if (p->mls_enabled) 3407 config |= POLICYDB_CONFIG_MLS; 3408 3409 if (p->reject_unknown) 3410 config |= REJECT_UNKNOWN; 3411 if (p->allow_unknown) 3412 config |= ALLOW_UNKNOWN; 3413 3414 /* Write the magic number and string identifiers. */ 3415 buf[0] = cpu_to_le32(POLICYDB_MAGIC); 3416 len = strlen(POLICYDB_STRING); 3417 buf[1] = cpu_to_le32(len); 3418 rc = put_entry(buf, sizeof(u32), 2, fp); 3419 if (rc) 3420 return rc; 3421 rc = put_entry(POLICYDB_STRING, 1, len, fp); 3422 if (rc) 3423 return rc; 3424 3425 /* Write the version, config, and table sizes. */ 3426 info = policydb_lookup_compat(p->policyvers); 3427 if (!info) { 3428 pr_err("SELinux: compatibility lookup failed for policy " 3429 "version %d", p->policyvers); 3430 return -EINVAL; 3431 } 3432 3433 buf[0] = cpu_to_le32(p->policyvers); 3434 buf[1] = cpu_to_le32(config); 3435 buf[2] = cpu_to_le32(info->sym_num); 3436 buf[3] = cpu_to_le32(info->ocon_num); 3437 3438 rc = put_entry(buf, sizeof(u32), 4, fp); 3439 if (rc) 3440 return rc; 3441 3442 if (p->policyvers >= POLICYDB_VERSION_POLCAP) { 3443 rc = ebitmap_write(&p->policycaps, fp); 3444 if (rc) 3445 return rc; 3446 } 3447 3448 if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) { 3449 rc = ebitmap_write(&p->permissive_map, fp); 3450 if (rc) 3451 return rc; 3452 } 3453 3454 num_syms = info->sym_num; 3455 for (i = 0; i < num_syms; i++) { 3456 struct policy_data pd; 3457 3458 pd.fp = fp; 3459 pd.p = p; 3460 3461 buf[0] = cpu_to_le32(p->symtab[i].nprim); 3462 buf[1] = cpu_to_le32(p->symtab[i].table->nel); 3463 3464 rc = put_entry(buf, sizeof(u32), 2, fp); 3465 if (rc) 3466 return rc; 3467 rc = hashtab_map(p->symtab[i].table, write_f[i], &pd); 3468 if (rc) 3469 return rc; 3470 } 3471 3472 rc = avtab_write(p, &p->te_avtab, fp); 3473 if (rc) 3474 return rc; 3475 3476 rc = cond_write_list(p, p->cond_list, fp); 3477 if (rc) 3478 return rc; 3479 3480 rc = role_trans_write(p, fp); 3481 if (rc) 3482 return rc; 3483 3484 rc = role_allow_write(p->role_allow, fp); 3485 if (rc) 3486 return rc; 3487 3488 rc = filename_trans_write(p, fp); 3489 if (rc) 3490 return rc; 3491 3492 rc = ocontext_write(p, info, fp); 3493 if (rc) 3494 return rc; 3495 3496 rc = genfs_write(p, fp); 3497 if (rc) 3498 return rc; 3499 3500 rc = range_write(p, fp); 3501 if (rc) 3502 return rc; 3503 3504 for (i = 0; i < p->p_types.nprim; i++) { 3505 struct ebitmap *e = &p->type_attr_map_array[i]; 3506 3507 rc = ebitmap_write(e, fp); 3508 if (rc) 3509 return rc; 3510 } 3511 3512 return 0; 3513 } 3514