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