git.oblomov.eu Git - linux-2.6/blob - security/selinux/ss/policydb.c

   1 /*
   2  * Implementation of the policy database.
   3  *
   4  * Author : Stephen Smalley, <sds@epoch.ncsc.mil>
   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.moore@hp.com>
  17  *
  18  *      Added support for the policy capability bitmap
  19  *
  20  * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
  21  * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
  22  * Copyright (C) 2003 - 2004 Tresys Technology, LLC
  23  *      This program is free software; you can redistribute it and/or modify
  24  *      it under the terms of the GNU General Public License as published by
  25  *      the Free Software Foundation, version 2.
  26  */
  27
  28 #include <linux/kernel.h>
  29 #include <linux/sched.h>
  30 #include <linux/slab.h>
  31 #include <linux/string.h>
  32 #include <linux/errno.h>
  33 #include "security.h"
  34
  35 #include "policydb.h"
  36 #include "conditional.h"
  37 #include "mls.h"
  38
  39 #define _DEBUG_HASHES
  40
  41 #ifdef DEBUG_HASHES
  42 static char *symtab_name[SYM_NUM] = {
  43         "common prefixes",
  44         "classes",
  45         "roles",
  46         "types",
  47         "users",
  48         "bools",
  49         "levels",
  50         "categories",
  51 };
  52 #endif
  53
  54 int selinux_mls_enabled;
  55
  56 static unsigned int symtab_sizes[SYM_NUM] = {
  57         2,
  58         32,
  59         16,
  60         512,
  61         128,
  62         16,
  63         16,
  64         16,
  65 };
  66
  67 struct policydb_compat_info {
  68         int version;
  69         int sym_num;
  70         int ocon_num;
  71 };
  72
  73 /* These need to be updated if SYM_NUM or OCON_NUM changes */
  74 static struct policydb_compat_info policydb_compat[] = {
  75         {
  76                 .version        = POLICYDB_VERSION_BASE,
  77                 .sym_num        = SYM_NUM - 3,
  78                 .ocon_num       = OCON_NUM - 1,
  79         },
  80         {
  81                 .version        = POLICYDB_VERSION_BOOL,
  82                 .sym_num        = SYM_NUM - 2,
  83                 .ocon_num       = OCON_NUM - 1,
  84         },
  85         {
  86                 .version        = POLICYDB_VERSION_IPV6,
  87                 .sym_num        = SYM_NUM - 2,
  88                 .ocon_num       = OCON_NUM,
  89         },
  90         {
  91                 .version        = POLICYDB_VERSION_NLCLASS,
  92                 .sym_num        = SYM_NUM - 2,
  93                 .ocon_num       = OCON_NUM,
  94         },
  95         {
  96                 .version        = POLICYDB_VERSION_MLS,
  97                 .sym_num        = SYM_NUM,
  98                 .ocon_num       = OCON_NUM,
  99         },
 100         {
 101                 .version        = POLICYDB_VERSION_AVTAB,
 102                 .sym_num        = SYM_NUM,
 103                 .ocon_num       = OCON_NUM,
 104         },
 105         {
 106                 .version        = POLICYDB_VERSION_RANGETRANS,
 107                 .sym_num        = SYM_NUM,
 108                 .ocon_num       = OCON_NUM,
 109         },
 110         {
 111                 .version        = POLICYDB_VERSION_POLCAP,
 112                 .sym_num        = SYM_NUM,
 113                 .ocon_num       = OCON_NUM,
 114         },
 115         {
 116                 .version        = POLICYDB_VERSION_PERMISSIVE,
 117                 .sym_num        = SYM_NUM,
 118                 .ocon_num       = OCON_NUM,
 119         }
 120 };
 121
 122 static struct policydb_compat_info *policydb_lookup_compat(int version)
 123 {
 124         int i;
 125         struct policydb_compat_info *info = NULL;
 126
 127         for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) {
 128                 if (policydb_compat[i].version == version) {
 129                         info = &policydb_compat[i];
 130                         break;
 131                 }
 132         }
 133         return info;
 134 }
 135
 136 /*
 137  * Initialize the role table.
 138  */
 139 static int roles_init(struct policydb *p)
 140 {
 141         char *key = NULL;
 142         int rc;
 143         struct role_datum *role;
 144
 145         role = kzalloc(sizeof(*role), GFP_KERNEL);
 146         if (!role) {
 147                 rc = -ENOMEM;
 148                 goto out;
 149         }
 150         role->value = ++p->p_roles.nprim;
 151         if (role->value != OBJECT_R_VAL) {
 152                 rc = -EINVAL;
 153                 goto out_free_role;
 154         }
 155         key = kmalloc(strlen(OBJECT_R)+1, GFP_KERNEL);
 156         if (!key) {
 157                 rc = -ENOMEM;
 158                 goto out_free_role;
 159         }
 160         strcpy(key, OBJECT_R);
 161         rc = hashtab_insert(p->p_roles.table, key, role);
 162         if (rc)
 163                 goto out_free_key;
 164 out:
 165         return rc;
 166
 167 out_free_key:
 168         kfree(key);
 169 out_free_role:
 170         kfree(role);
 171         goto out;
 172 }
 173
 174 /*
 175  * Initialize a policy database structure.
 176  */
 177 static int policydb_init(struct policydb *p)
 178 {
 179         int i, rc;
 180
 181         memset(p, 0, sizeof(*p));
 182
 183         for (i = 0; i < SYM_NUM; i++) {
 184                 rc = symtab_init(&p->symtab[i], symtab_sizes[i]);
 185                 if (rc)
 186                         goto out_free_symtab;
 187         }
 188
 189         rc = avtab_init(&p->te_avtab);
 190         if (rc)
 191                 goto out_free_symtab;
 192
 193         rc = roles_init(p);
 194         if (rc)
 195                 goto out_free_symtab;
 196
 197         rc = cond_policydb_init(p);
 198         if (rc)
 199                 goto out_free_symtab;
 200
 201         ebitmap_init(&p->policycaps);
 202         ebitmap_init(&p->permissive_map);
 203
 204 out:
 205         return rc;
 206
 207 out_free_symtab:
 208         for (i = 0; i < SYM_NUM; i++)
 209                 hashtab_destroy(p->symtab[i].table);
 210         goto out;
 211 }
 212
 213 /*
 214  * The following *_index functions are used to
 215  * define the val_to_name and val_to_struct arrays
 216  * in a policy database structure.  The val_to_name
 217  * arrays are used when converting security context
 218  * structures into string representations.  The
 219  * val_to_struct arrays are used when the attributes
 220  * of a class, role, or user are needed.
 221  */
 222
 223 static int common_index(void *key, void *datum, void *datap)
 224 {
 225         struct policydb *p;
 226         struct common_datum *comdatum;
 227
 228         comdatum = datum;
 229         p = datap;
 230         if (!comdatum->value || comdatum->value > p->p_commons.nprim)
 231                 return -EINVAL;
 232         p->p_common_val_to_name[comdatum->value - 1] = key;
 233         return 0;
 234 }
 235
 236 static int class_index(void *key, void *datum, void *datap)
 237 {
 238         struct policydb *p;
 239         struct class_datum *cladatum;
 240
 241         cladatum = datum;
 242         p = datap;
 243         if (!cladatum->value || cladatum->value > p->p_classes.nprim)
 244                 return -EINVAL;
 245         p->p_class_val_to_name[cladatum->value - 1] = key;
 246         p->class_val_to_struct[cladatum->value - 1] = cladatum;
 247         return 0;
 248 }
 249
 250 static int role_index(void *key, void *datum, void *datap)
 251 {
 252         struct policydb *p;
 253         struct role_datum *role;
 254
 255         role = datum;
 256         p = datap;
 257         if (!role->value || role->value > p->p_roles.nprim)
 258                 return -EINVAL;
 259         p->p_role_val_to_name[role->value - 1] = key;
 260         p->role_val_to_struct[role->value - 1] = role;
 261         return 0;
 262 }
 263
 264 static int type_index(void *key, void *datum, void *datap)
 265 {
 266         struct policydb *p;
 267         struct type_datum *typdatum;
 268
 269         typdatum = datum;
 270         p = datap;
 271
 272         if (typdatum->primary) {
 273                 if (!typdatum->value || typdatum->value > p->p_types.nprim)
 274                         return -EINVAL;
 275                 p->p_type_val_to_name[typdatum->value - 1] = key;
 276         }
 277
 278         return 0;
 279 }
 280
 281 static int user_index(void *key, void *datum, void *datap)
 282 {
 283         struct policydb *p;
 284         struct user_datum *usrdatum;
 285
 286         usrdatum = datum;
 287         p = datap;
 288         if (!usrdatum->value || usrdatum->value > p->p_users.nprim)
 289                 return -EINVAL;
 290         p->p_user_val_to_name[usrdatum->value - 1] = key;
 291         p->user_val_to_struct[usrdatum->value - 1] = usrdatum;
 292         return 0;
 293 }
 294
 295 static int sens_index(void *key, void *datum, void *datap)
 296 {
 297         struct policydb *p;
 298         struct level_datum *levdatum;
 299
 300         levdatum = datum;
 301         p = datap;
 302
 303         if (!levdatum->isalias) {
 304                 if (!levdatum->level->sens ||
 305                     levdatum->level->sens > p->p_levels.nprim)
 306                         return -EINVAL;
 307                 p->p_sens_val_to_name[levdatum->level->sens - 1] = key;
 308         }
 309
 310         return 0;
 311 }
 312
 313 static int cat_index(void *key, void *datum, void *datap)
 314 {
 315         struct policydb *p;
 316         struct cat_datum *catdatum;
 317
 318         catdatum = datum;
 319         p = datap;
 320
 321         if (!catdatum->isalias) {
 322                 if (!catdatum->value || catdatum->value > p->p_cats.nprim)
 323                         return -EINVAL;
 324                 p->p_cat_val_to_name[catdatum->value - 1] = key;
 325         }
 326
 327         return 0;
 328 }
 329
 330 static int (*index_f[SYM_NUM]) (void *key, void *datum, void *datap) =
 331 {
 332         common_index,
 333         class_index,
 334         role_index,
 335         type_index,
 336         user_index,
 337         cond_index_bool,
 338         sens_index,
 339         cat_index,
 340 };
 341
 342 /*
 343  * Define the common val_to_name array and the class
 344  * val_to_name and val_to_struct arrays in a policy
 345  * database structure.
 346  *
 347  * Caller must clean up upon failure.
 348  */
 349 static int policydb_index_classes(struct policydb *p)
 350 {
 351         int rc;
 352
 353         p->p_common_val_to_name =
 354                 kmalloc(p->p_commons.nprim * sizeof(char *), GFP_KERNEL);
 355         if (!p->p_common_val_to_name) {
 356                 rc = -ENOMEM;
 357                 goto out;
 358         }
 359
 360         rc = hashtab_map(p->p_commons.table, common_index, p);
 361         if (rc)
 362                 goto out;
 363
 364         p->class_val_to_struct =
 365                 kmalloc(p->p_classes.nprim * sizeof(*(p->class_val_to_struct)), GFP_KERNEL);
 366         if (!p->class_val_to_struct) {
 367                 rc = -ENOMEM;
 368                 goto out;
 369         }
 370
 371         p->p_class_val_to_name =
 372                 kmalloc(p->p_classes.nprim * sizeof(char *), GFP_KERNEL);
 373         if (!p->p_class_val_to_name) {
 374                 rc = -ENOMEM;
 375                 goto out;
 376         }
 377
 378         rc = hashtab_map(p->p_classes.table, class_index, p);
 379 out:
 380         return rc;
 381 }
 382
 383 #ifdef DEBUG_HASHES
 384 static void symtab_hash_eval(struct symtab *s)
 385 {
 386         int i;
 387
 388         for (i = 0; i < SYM_NUM; i++) {
 389                 struct hashtab *h = s[i].table;
 390                 struct hashtab_info info;
 391
 392                 hashtab_stat(h, &info);
 393                 printk(KERN_DEBUG "SELinux: %s:  %d entries and %d/%d buckets used, "
 394                        "longest chain length %d\n", symtab_name[i], h->nel,
 395                        info.slots_used, h->size, info.max_chain_len);
 396         }
 397 }
 398 #endif
 399
 400 /*
 401  * Define the other val_to_name and val_to_struct arrays
 402  * in a policy database structure.
 403  *
 404  * Caller must clean up on failure.
 405  */
 406 static int policydb_index_others(struct policydb *p)
 407 {
 408         int i, rc = 0;
 409
 410         printk(KERN_DEBUG "SELinux:  %d users, %d roles, %d types, %d bools",
 411                p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim, p->p_bools.nprim);
 412         if (selinux_mls_enabled)
 413                 printk(", %d sens, %d cats", p->p_levels.nprim,
 414                        p->p_cats.nprim);
 415         printk("\n");
 416
 417         printk(KERN_DEBUG "SELinux:  %d classes, %d rules\n",
 418                p->p_classes.nprim, p->te_avtab.nel);
 419
 420 #ifdef DEBUG_HASHES
 421         avtab_hash_eval(&p->te_avtab, "rules");
 422         symtab_hash_eval(p->symtab);
 423 #endif
 424
 425         p->role_val_to_struct =
 426                 kmalloc(p->p_roles.nprim * sizeof(*(p->role_val_to_struct)),
 427                         GFP_KERNEL);
 428         if (!p->role_val_to_struct) {
 429                 rc = -ENOMEM;
 430                 goto out;
 431         }
 432
 433         p->user_val_to_struct =
 434                 kmalloc(p->p_users.nprim * sizeof(*(p->user_val_to_struct)),
 435                         GFP_KERNEL);
 436         if (!p->user_val_to_struct) {
 437                 rc = -ENOMEM;
 438                 goto out;
 439         }
 440
 441         if (cond_init_bool_indexes(p)) {
 442                 rc = -ENOMEM;
 443                 goto out;
 444         }
 445
 446         for (i = SYM_ROLES; i < SYM_NUM; i++) {
 447                 p->sym_val_to_name[i] =
 448                         kmalloc(p->symtab[i].nprim * sizeof(char *), GFP_KERNEL);
 449                 if (!p->sym_val_to_name[i]) {
 450                         rc = -ENOMEM;
 451                         goto out;
 452                 }
 453                 rc = hashtab_map(p->symtab[i].table, index_f[i], p);
 454                 if (rc)
 455                         goto out;
 456         }
 457
 458 out:
 459         return rc;
 460 }
 461
 462 /*
 463  * The following *_destroy functions are used to
 464  * free any memory allocated for each kind of
 465  * symbol data in the policy database.
 466  */
 467
 468 static int perm_destroy(void *key, void *datum, void *p)
 469 {
 470         kfree(key);
 471         kfree(datum);
 472         return 0;
 473 }
 474
 475 static int common_destroy(void *key, void *datum, void *p)
 476 {
 477         struct common_datum *comdatum;
 478
 479         kfree(key);
 480         comdatum = datum;
 481         hashtab_map(comdatum->permissions.table, perm_destroy, NULL);
 482         hashtab_destroy(comdatum->permissions.table);
 483         kfree(datum);
 484         return 0;
 485 }
 486
 487 static int cls_destroy(void *key, void *datum, void *p)
 488 {
 489         struct class_datum *cladatum;
 490         struct constraint_node *constraint, *ctemp;
 491         struct constraint_expr *e, *etmp;
 492
 493         kfree(key);
 494         cladatum = datum;
 495         hashtab_map(cladatum->permissions.table, perm_destroy, NULL);
 496         hashtab_destroy(cladatum->permissions.table);
 497         constraint = cladatum->constraints;
 498         while (constraint) {
 499                 e = constraint->expr;
 500                 while (e) {
 501                         ebitmap_destroy(&e->names);
 502                         etmp = e;
 503                         e = e->next;
 504                         kfree(etmp);
 505                 }
 506                 ctemp = constraint;
 507                 constraint = constraint->next;
 508                 kfree(ctemp);
 509         }
 510
 511         constraint = cladatum->validatetrans;
 512         while (constraint) {
 513                 e = constraint->expr;
 514                 while (e) {
 515                         ebitmap_destroy(&e->names);
 516                         etmp = e;
 517                         e = e->next;
 518                         kfree(etmp);
 519                 }
 520                 ctemp = constraint;
 521                 constraint = constraint->next;
 522                 kfree(ctemp);
 523         }
 524
 525         kfree(cladatum->comkey);
 526         kfree(datum);
 527         return 0;
 528 }
 529
 530 static int role_destroy(void *key, void *datum, void *p)
 531 {
 532         struct role_datum *role;
 533
 534         kfree(key);
 535         role = datum;
 536         ebitmap_destroy(&role->dominates);
 537         ebitmap_destroy(&role->types);
 538         kfree(datum);
 539         return 0;
 540 }
 541
 542 static int type_destroy(void *key, void *datum, void *p)
 543 {
 544         kfree(key);
 545         kfree(datum);
 546         return 0;
 547 }
 548
 549 static int user_destroy(void *key, void *datum, void *p)
 550 {
 551         struct user_datum *usrdatum;
 552
 553         kfree(key);
 554         usrdatum = datum;
 555         ebitmap_destroy(&usrdatum->roles);
 556         ebitmap_destroy(&usrdatum->range.level[0].cat);
 557         ebitmap_destroy(&usrdatum->range.level[1].cat);
 558         ebitmap_destroy(&usrdatum->dfltlevel.cat);
 559         kfree(datum);
 560         return 0;
 561 }
 562
 563 static int sens_destroy(void *key, void *datum, void *p)
 564 {
 565         struct level_datum *levdatum;
 566
 567         kfree(key);
 568         levdatum = datum;
 569         ebitmap_destroy(&levdatum->level->cat);
 570         kfree(levdatum->level);
 571         kfree(datum);
 572         return 0;
 573 }
 574
 575 static int cat_destroy(void *key, void *datum, void *p)
 576 {
 577         kfree(key);
 578         kfree(datum);
 579         return 0;
 580 }
 581
 582 static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) =
 583 {
 584         common_destroy,
 585         cls_destroy,
 586         role_destroy,
 587         type_destroy,
 588         user_destroy,
 589         cond_destroy_bool,
 590         sens_destroy,
 591         cat_destroy,
 592 };
 593
 594 static void ocontext_destroy(struct ocontext *c, int i)
 595 {
 596         context_destroy(&c->context[0]);
 597         context_destroy(&c->context[1]);
 598         if (i == OCON_ISID || i == OCON_FS ||
 599             i == OCON_NETIF || i == OCON_FSUSE)
 600                 kfree(c->u.name);
 601         kfree(c);
 602 }
 603
 604 /*
 605  * Free any memory allocated by a policy database structure.
 606  */
 607 void policydb_destroy(struct policydb *p)
 608 {
 609         struct ocontext *c, *ctmp;
 610         struct genfs *g, *gtmp;
 611         int i;
 612         struct role_allow *ra, *lra = NULL;
 613         struct role_trans *tr, *ltr = NULL;
 614         struct range_trans *rt, *lrt = NULL;
 615
 616         for (i = 0; i < SYM_NUM; i++) {
 617                 cond_resched();
 618                 hashtab_map(p->symtab[i].table, destroy_f[i], NULL);
 619                 hashtab_destroy(p->symtab[i].table);
 620         }
 621
 622         for (i = 0; i < SYM_NUM; i++)
 623                 kfree(p->sym_val_to_name[i]);
 624
 625         kfree(p->class_val_to_struct);
 626         kfree(p->role_val_to_struct);
 627         kfree(p->user_val_to_struct);
 628
 629         avtab_destroy(&p->te_avtab);
 630
 631         for (i = 0; i < OCON_NUM; i++) {
 632                 cond_resched();
 633                 c = p->ocontexts[i];
 634                 while (c) {
 635                         ctmp = c;
 636                         c = c->next;
 637                         ocontext_destroy(ctmp, i);
 638                 }
 639                 p->ocontexts[i] = NULL;
 640         }
 641
 642         g = p->genfs;
 643         while (g) {
 644                 cond_resched();
 645                 kfree(g->fstype);
 646                 c = g->head;
 647                 while (c) {
 648                         ctmp = c;
 649                         c = c->next;
 650                         ocontext_destroy(ctmp, OCON_FSUSE);
 651                 }
 652                 gtmp = g;
 653                 g = g->next;
 654                 kfree(gtmp);
 655         }
 656         p->genfs = NULL;
 657
 658         cond_policydb_destroy(p);
 659
 660         for (tr = p->role_tr; tr; tr = tr->next) {
 661                 cond_resched();
 662                 kfree(ltr);
 663                 ltr = tr;
 664         }
 665         kfree(ltr);
 666
 667         for (ra = p->role_allow; ra; ra = ra->next) {
 668                 cond_resched();
 669                 kfree(lra);
 670                 lra = ra;
 671         }
 672         kfree(lra);
 673
 674         for (rt = p->range_tr; rt; rt = rt->next) {
 675                 cond_resched();
 676                 if (lrt) {
 677                         ebitmap_destroy(&lrt->target_range.level[0].cat);
 678                         ebitmap_destroy(&lrt->target_range.level[1].cat);
 679                         kfree(lrt);
 680                 }
 681                 lrt = rt;
 682         }
 683         if (lrt) {
 684                 ebitmap_destroy(&lrt->target_range.level[0].cat);
 685                 ebitmap_destroy(&lrt->target_range.level[1].cat);
 686                 kfree(lrt);
 687         }
 688
 689         if (p->type_attr_map) {
 690                 for (i = 0; i < p->p_types.nprim; i++)
 691                         ebitmap_destroy(&p->type_attr_map[i]);
 692         }
 693         kfree(p->type_attr_map);
 694         kfree(p->undefined_perms);
 695         ebitmap_destroy(&p->policycaps);
 696         ebitmap_destroy(&p->permissive_map);
 697
 698         return;
 699 }
 700
 701 /*
 702  * Load the initial SIDs specified in a policy database
 703  * structure into a SID table.
 704  */
 705 int policydb_load_isids(struct policydb *p, struct sidtab *s)
 706 {
 707         struct ocontext *head, *c;
 708         int rc;
 709
 710         rc = sidtab_init(s);
 711         if (rc) {
 712                 printk(KERN_ERR "SELinux:  out of memory on SID table init\n");
 713                 goto out;
 714         }
 715
 716         head = p->ocontexts[OCON_ISID];
 717         for (c = head; c; c = c->next) {
 718                 if (!c->context[0].user) {
 719                         printk(KERN_ERR "SELinux:  SID %s was never "
 720                                "defined.\n", c->u.name);
 721                         rc = -EINVAL;
 722                         goto out;
 723                 }
 724                 if (sidtab_insert(s, c->sid[0], &c->context[0])) {
 725                         printk(KERN_ERR "SELinux:  unable to load initial "
 726                                "SID %s.\n", c->u.name);
 727                         rc = -EINVAL;
 728                         goto out;
 729                 }
 730         }
 731 out:
 732         return rc;
 733 }
 734
 735 int policydb_class_isvalid(struct policydb *p, unsigned int class)
 736 {
 737         if (!class || class > p->p_classes.nprim)
 738                 return 0;
 739         return 1;
 740 }
 741
 742 int policydb_role_isvalid(struct policydb *p, unsigned int role)
 743 {
 744         if (!role || role > p->p_roles.nprim)
 745                 return 0;
 746         return 1;
 747 }
 748
 749 int policydb_type_isvalid(struct policydb *p, unsigned int type)
 750 {
 751         if (!type || type > p->p_types.nprim)
 752                 return 0;
 753         return 1;
 754 }
 755
 756 /*
 757  * Return 1 if the fields in the security context
 758  * structure `c' are valid.  Return 0 otherwise.
 759  */
 760 int policydb_context_isvalid(struct policydb *p, struct context *c)
 761 {
 762         struct role_datum *role;
 763         struct user_datum *usrdatum;
 764
 765         if (!c->role || c->role > p->p_roles.nprim)
 766                 return 0;
 767
 768         if (!c->user || c->user > p->p_users.nprim)
 769                 return 0;
 770
 771         if (!c->type || c->type > p->p_types.nprim)
 772                 return 0;
 773
 774         if (c->role != OBJECT_R_VAL) {
 775                 /*
 776                  * Role must be authorized for the type.
 777                  */
 778                 role = p->role_val_to_struct[c->role - 1];
 779                 if (!ebitmap_get_bit(&role->types,
 780                                      c->type - 1))
 781                         /* role may not be associated with type */
 782                         return 0;
 783
 784                 /*
 785                  * User must be authorized for the role.
 786                  */
 787                 usrdatum = p->user_val_to_struct[c->user - 1];
 788                 if (!usrdatum)
 789                         return 0;
 790
 791                 if (!ebitmap_get_bit(&usrdatum->roles,
 792                                      c->role - 1))
 793                         /* user may not be associated with role */
 794                         return 0;
 795         }
 796
 797         if (!mls_context_isvalid(p, c))
 798                 return 0;
 799
 800         return 1;
 801 }
 802
 803 /*
 804  * Read a MLS range structure from a policydb binary
 805  * representation file.
 806  */
 807 static int mls_read_range_helper(struct mls_range *r, void *fp)
 808 {
 809         __le32 buf[2];
 810         u32 items;
 811         int rc;
 812
 813         rc = next_entry(buf, fp, sizeof(u32));
 814         if (rc < 0)
 815                 goto out;
 816
 817         items = le32_to_cpu(buf[0]);
 818         if (items > ARRAY_SIZE(buf)) {
 819                 printk(KERN_ERR "SELinux: mls:  range overflow\n");
 820                 rc = -EINVAL;
 821                 goto out;
 822         }
 823         rc = next_entry(buf, fp, sizeof(u32) * items);
 824         if (rc < 0) {
 825                 printk(KERN_ERR "SELinux: mls:  truncated range\n");
 826                 goto out;
 827         }
 828         r->level[0].sens = le32_to_cpu(buf[0]);
 829         if (items > 1)
 830                 r->level[1].sens = le32_to_cpu(buf[1]);
 831         else
 832                 r->level[1].sens = r->level[0].sens;
 833
 834         rc = ebitmap_read(&r->level[0].cat, fp);
 835         if (rc) {
 836                 printk(KERN_ERR "SELinux: mls:  error reading low "
 837                        "categories\n");
 838                 goto out;
 839         }
 840         if (items > 1) {
 841                 rc = ebitmap_read(&r->level[1].cat, fp);
 842                 if (rc) {
 843                         printk(KERN_ERR "SELinux: mls:  error reading high "
 844                                "categories\n");
 845                         goto bad_high;
 846                 }
 847         } else {
 848                 rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat);
 849                 if (rc) {
 850                         printk(KERN_ERR "SELinux: mls:  out of memory\n");
 851                         goto bad_high;
 852                 }
 853         }
 854
 855         rc = 0;
 856 out:
 857         return rc;
 858 bad_high:
 859         ebitmap_destroy(&r->level[0].cat);
 860         goto out;
 861 }
 862
 863 /*
 864  * Read and validate a security context structure
 865  * from a policydb binary representation file.
 866  */
 867 static int context_read_and_validate(struct context *c,
 868                                      struct policydb *p,
 869                                      void *fp)
 870 {
 871         __le32 buf[3];
 872         int rc;
 873
 874         rc = next_entry(buf, fp, sizeof buf);
 875         if (rc < 0) {
 876                 printk(KERN_ERR "SELinux: context truncated\n");
 877                 goto out;
 878         }
 879         c->user = le32_to_cpu(buf[0]);
 880         c->role = le32_to_cpu(buf[1]);
 881         c->type = le32_to_cpu(buf[2]);
 882         if (p->policyvers >= POLICYDB_VERSION_MLS) {
 883                 if (mls_read_range_helper(&c->range, fp)) {
 884                         printk(KERN_ERR "SELinux: error reading MLS range of "
 885                                "context\n");
 886                         rc = -EINVAL;
 887                         goto out;
 888                 }
 889         }
 890
 891         if (!policydb_context_isvalid(p, c)) {
 892                 printk(KERN_ERR "SELinux:  invalid security context\n");
 893                 context_destroy(c);
 894                 rc = -EINVAL;
 895         }
 896 out:
 897         return rc;
 898 }
 899
 900 /*
 901  * The following *_read functions are used to
 902  * read the symbol data from a policy database
 903  * binary representation file.
 904  */
 905
 906 static int perm_read(struct policydb *p, struct hashtab *h, void *fp)
 907 {
 908         char *key = NULL;
 909         struct perm_datum *perdatum;
 910         int rc;
 911         __le32 buf[2];
 912         u32 len;
 913
 914         perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
 915         if (!perdatum) {
 916                 rc = -ENOMEM;
 917                 goto out;
 918         }
 919
 920         rc = next_entry(buf, fp, sizeof buf);
 921         if (rc < 0)
 922                 goto bad;
 923
 924         len = le32_to_cpu(buf[0]);
 925         perdatum->value = le32_to_cpu(buf[1]);
 926
 927         key = kmalloc(len + 1, GFP_KERNEL);
 928         if (!key) {
 929                 rc = -ENOMEM;
 930                 goto bad;
 931         }
 932         rc = next_entry(key, fp, len);
 933         if (rc < 0)
 934                 goto bad;
 935         key[len] = 0;
 936
 937         rc = hashtab_insert(h, key, perdatum);
 938         if (rc)
 939                 goto bad;
 940 out:
 941         return rc;
 942 bad:
 943         perm_destroy(key, perdatum, NULL);
 944         goto out;
 945 }
 946
 947 static int common_read(struct policydb *p, struct hashtab *h, void *fp)
 948 {
 949         char *key = NULL;
 950         struct common_datum *comdatum;
 951         __le32 buf[4];
 952         u32 len, nel;
 953         int i, rc;
 954
 955         comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
 956         if (!comdatum) {
 957                 rc = -ENOMEM;
 958                 goto out;
 959         }
 960
 961         rc = next_entry(buf, fp, sizeof buf);
 962         if (rc < 0)
 963                 goto bad;
 964
 965         len = le32_to_cpu(buf[0]);
 966         comdatum->value = le32_to_cpu(buf[1]);
 967
 968         rc = symtab_init(&comdatum->permissions, PERM_SYMTAB_SIZE);
 969         if (rc)
 970                 goto bad;
 971         comdatum->permissions.nprim = le32_to_cpu(buf[2]);
 972         nel = le32_to_cpu(buf[3]);
 973
 974         key = kmalloc(len + 1, GFP_KERNEL);
 975         if (!key) {
 976                 rc = -ENOMEM;
 977                 goto bad;
 978         }
 979         rc = next_entry(key, fp, len);
 980         if (rc < 0)
 981                 goto bad;
 982         key[len] = 0;
 983
 984         for (i = 0; i < nel; i++) {
 985                 rc = perm_read(p, comdatum->permissions.table, fp);
 986                 if (rc)
 987                         goto bad;
 988         }
 989
 990         rc = hashtab_insert(h, key, comdatum);
 991         if (rc)
 992                 goto bad;
 993 out:
 994         return rc;
 995 bad:
 996         common_destroy(key, comdatum, NULL);
 997         goto out;
 998 }
 999
1000 static int read_cons_helper(struct constraint_node **nodep, int ncons,
1001                             int allowxtarget, void *fp)
1002 {
1003         struct constraint_node *c, *lc;
1004         struct constraint_expr *e, *le;
1005         __le32 buf[3];
1006         u32 nexpr;
1007         int rc, i, j, depth;
1008
1009         lc = NULL;
1010         for (i = 0; i < ncons; i++) {
1011                 c = kzalloc(sizeof(*c), GFP_KERNEL);
1012                 if (!c)
1013                         return -ENOMEM;
1014
1015                 if (lc)
1016                         lc->next = c;
1017                 else
1018                         *nodep = c;
1019
1020                 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1021                 if (rc < 0)
1022                         return rc;
1023                 c->permissions = le32_to_cpu(buf[0]);
1024                 nexpr = le32_to_cpu(buf[1]);
1025                 le = NULL;
1026                 depth = -1;
1027                 for (j = 0; j < nexpr; j++) {
1028                         e = kzalloc(sizeof(*e), GFP_KERNEL);
1029                         if (!e)
1030                                 return -ENOMEM;
1031
1032                         if (le)
1033                                 le->next = e;
1034                         else
1035                                 c->expr = e;
1036
1037                         rc = next_entry(buf, fp, (sizeof(u32) * 3));
1038                         if (rc < 0)
1039                                 return rc;
1040                         e->expr_type = le32_to_cpu(buf[0]);
1041                         e->attr = le32_to_cpu(buf[1]);
1042                         e->op = le32_to_cpu(buf[2]);
1043
1044                         switch (e->expr_type) {
1045                         case CEXPR_NOT:
1046                                 if (depth < 0)
1047                                         return -EINVAL;
1048                                 break;
1049                         case CEXPR_AND:
1050                         case CEXPR_OR:
1051                                 if (depth < 1)
1052                                         return -EINVAL;
1053                                 depth--;
1054                                 break;
1055                         case CEXPR_ATTR:
1056                                 if (depth == (CEXPR_MAXDEPTH - 1))
1057                                         return -EINVAL;
1058                                 depth++;
1059                                 break;
1060                         case CEXPR_NAMES:
1061                                 if (!allowxtarget && (e->attr & CEXPR_XTARGET))
1062                                         return -EINVAL;
1063                                 if (depth == (CEXPR_MAXDEPTH - 1))
1064                                         return -EINVAL;
1065                                 depth++;
1066                                 if (ebitmap_read(&e->names, fp))
1067                                         return -EINVAL;
1068                                 break;
1069                         default:
1070                                 return -EINVAL;
1071                         }
1072                         le = e;
1073                 }
1074                 if (depth != 0)
1075                         return -EINVAL;
1076                 lc = c;
1077         }
1078
1079         return 0;
1080 }
1081
1082 static int class_read(struct policydb *p, struct hashtab *h, void *fp)
1083 {
1084         char *key = NULL;
1085         struct class_datum *cladatum;
1086         __le32 buf[6];
1087         u32 len, len2, ncons, nel;
1088         int i, rc;
1089
1090         cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
1091         if (!cladatum) {
1092                 rc = -ENOMEM;
1093                 goto out;
1094         }
1095
1096         rc = next_entry(buf, fp, sizeof(u32)*6);
1097         if (rc < 0)
1098                 goto bad;
1099
1100         len = le32_to_cpu(buf[0]);
1101         len2 = le32_to_cpu(buf[1]);
1102         cladatum->value = le32_to_cpu(buf[2]);
1103
1104         rc = symtab_init(&cladatum->permissions, PERM_SYMTAB_SIZE);
1105         if (rc)
1106                 goto bad;
1107         cladatum->permissions.nprim = le32_to_cpu(buf[3]);
1108         nel = le32_to_cpu(buf[4]);
1109
1110         ncons = le32_to_cpu(buf[5]);
1111
1112         key = kmalloc(len + 1, GFP_KERNEL);
1113         if (!key) {
1114                 rc = -ENOMEM;
1115                 goto bad;
1116         }
1117         rc = next_entry(key, fp, len);
1118         if (rc < 0)
1119                 goto bad;
1120         key[len] = 0;
1121
1122         if (len2) {
1123                 cladatum->comkey = kmalloc(len2 + 1, GFP_KERNEL);
1124                 if (!cladatum->comkey) {
1125                         rc = -ENOMEM;
1126                         goto bad;
1127                 }
1128                 rc = next_entry(cladatum->comkey, fp, len2);
1129                 if (rc < 0)
1130                         goto bad;
1131                 cladatum->comkey[len2] = 0;
1132
1133                 cladatum->comdatum = hashtab_search(p->p_commons.table,
1134                                                     cladatum->comkey);
1135                 if (!cladatum->comdatum) {
1136                         printk(KERN_ERR "SELinux:  unknown common %s\n",
1137                                cladatum->comkey);
1138                         rc = -EINVAL;
1139                         goto bad;
1140                 }
1141         }
1142         for (i = 0; i < nel; i++) {
1143                 rc = perm_read(p, cladatum->permissions.table, fp);
1144                 if (rc)
1145                         goto bad;
1146         }
1147
1148         rc = read_cons_helper(&cladatum->constraints, ncons, 0, fp);
1149         if (rc)
1150                 goto bad;
1151
1152         if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
1153                 /* grab the validatetrans rules */
1154                 rc = next_entry(buf, fp, sizeof(u32));
1155                 if (rc < 0)
1156                         goto bad;
1157                 ncons = le32_to_cpu(buf[0]);
1158                 rc = read_cons_helper(&cladatum->validatetrans, ncons, 1, fp);
1159                 if (rc)
1160                         goto bad;
1161         }
1162
1163         rc = hashtab_insert(h, key, cladatum);
1164         if (rc)
1165                 goto bad;
1166
1167         rc = 0;
1168 out:
1169         return rc;
1170 bad:
1171         cls_destroy(key, cladatum, NULL);
1172         goto out;
1173 }
1174
1175 static int role_read(struct policydb *p, struct hashtab *h, void *fp)
1176 {
1177         char *key = NULL;
1178         struct role_datum *role;
1179         int rc;
1180         __le32 buf[2];
1181         u32 len;
1182
1183         role = kzalloc(sizeof(*role), GFP_KERNEL);
1184         if (!role) {
1185                 rc = -ENOMEM;
1186                 goto out;
1187         }
1188
1189         rc = next_entry(buf, fp, sizeof buf);
1190         if (rc < 0)
1191                 goto bad;
1192
1193         len = le32_to_cpu(buf[0]);
1194         role->value = le32_to_cpu(buf[1]);
1195
1196         key = kmalloc(len + 1, GFP_KERNEL);
1197         if (!key) {
1198                 rc = -ENOMEM;
1199                 goto bad;
1200         }
1201         rc = next_entry(key, fp, len);
1202         if (rc < 0)
1203                 goto bad;
1204         key[len] = 0;
1205
1206         rc = ebitmap_read(&role->dominates, fp);
1207         if (rc)
1208                 goto bad;
1209
1210         rc = ebitmap_read(&role->types, fp);
1211         if (rc)
1212                 goto bad;
1213
1214         if (strcmp(key, OBJECT_R) == 0) {
1215                 if (role->value != OBJECT_R_VAL) {
1216                         printk(KERN_ERR "SELinux: Role %s has wrong value %d\n",
1217                                OBJECT_R, role->value);
1218                         rc = -EINVAL;
1219                         goto bad;
1220                 }
1221                 rc = 0;
1222                 goto bad;
1223         }
1224
1225         rc = hashtab_insert(h, key, role);
1226         if (rc)
1227                 goto bad;
1228 out:
1229         return rc;
1230 bad:
1231         role_destroy(key, role, NULL);
1232         goto out;
1233 }
1234
1235 static int type_read(struct policydb *p, struct hashtab *h, void *fp)
1236 {
1237         char *key = NULL;
1238         struct type_datum *typdatum;
1239         int rc;
1240         __le32 buf[3];
1241         u32 len;
1242
1243         typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL);
1244         if (!typdatum) {
1245                 rc = -ENOMEM;
1246                 return rc;
1247         }
1248
1249         rc = next_entry(buf, fp, sizeof buf);
1250         if (rc < 0)
1251                 goto bad;
1252
1253         len = le32_to_cpu(buf[0]);
1254         typdatum->value = le32_to_cpu(buf[1]);
1255         typdatum->primary = le32_to_cpu(buf[2]);
1256
1257         key = kmalloc(len + 1, GFP_KERNEL);
1258         if (!key) {
1259                 rc = -ENOMEM;
1260                 goto bad;
1261         }
1262         rc = next_entry(key, fp, len);
1263         if (rc < 0)
1264                 goto bad;
1265         key[len] = 0;
1266
1267         rc = hashtab_insert(h, key, typdatum);
1268         if (rc)
1269                 goto bad;
1270 out:
1271         return rc;
1272 bad:
1273         type_destroy(key, typdatum, NULL);
1274         goto out;
1275 }
1276
1277
1278 /*
1279  * Read a MLS level structure from a policydb binary
1280  * representation file.
1281  */
1282 static int mls_read_level(struct mls_level *lp, void *fp)
1283 {
1284         __le32 buf[1];
1285         int rc;
1286
1287         memset(lp, 0, sizeof(*lp));
1288
1289         rc = next_entry(buf, fp, sizeof buf);
1290         if (rc < 0) {
1291                 printk(KERN_ERR "SELinux: mls: truncated level\n");
1292                 goto bad;
1293         }
1294         lp->sens = le32_to_cpu(buf[0]);
1295
1296         if (ebitmap_read(&lp->cat, fp)) {
1297                 printk(KERN_ERR "SELinux: mls:  error reading level "
1298                        "categories\n");
1299                 goto bad;
1300         }
1301
1302         return 0;
1303
1304 bad:
1305         return -EINVAL;
1306 }
1307
1308 static int user_read(struct policydb *p, struct hashtab *h, void *fp)
1309 {
1310         char *key = NULL;
1311         struct user_datum *usrdatum;
1312         int rc;
1313         __le32 buf[2];
1314         u32 len;
1315
1316         usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
1317         if (!usrdatum) {
1318                 rc = -ENOMEM;
1319                 goto out;
1320         }
1321
1322         rc = next_entry(buf, fp, sizeof buf);
1323         if (rc < 0)
1324                 goto bad;
1325
1326         len = le32_to_cpu(buf[0]);
1327         usrdatum->value = le32_to_cpu(buf[1]);
1328
1329         key = kmalloc(len + 1, GFP_KERNEL);
1330         if (!key) {
1331                 rc = -ENOMEM;
1332                 goto bad;
1333         }
1334         rc = next_entry(key, fp, len);
1335         if (rc < 0)
1336                 goto bad;
1337         key[len] = 0;
1338
1339         rc = ebitmap_read(&usrdatum->roles, fp);
1340         if (rc)
1341                 goto bad;
1342
1343         if (p->policyvers >= POLICYDB_VERSION_MLS) {
1344                 rc = mls_read_range_helper(&usrdatum->range, fp);
1345                 if (rc)
1346                         goto bad;
1347                 rc = mls_read_level(&usrdatum->dfltlevel, fp);
1348                 if (rc)
1349                         goto bad;
1350         }
1351
1352         rc = hashtab_insert(h, key, usrdatum);
1353         if (rc)
1354                 goto bad;
1355 out:
1356         return rc;
1357 bad:
1358         user_destroy(key, usrdatum, NULL);
1359         goto out;
1360 }
1361
1362 static int sens_read(struct policydb *p, struct hashtab *h, void *fp)
1363 {
1364         char *key = NULL;
1365         struct level_datum *levdatum;
1366         int rc;
1367         __le32 buf[2];
1368         u32 len;
1369
1370         levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC);
1371         if (!levdatum) {
1372                 rc = -ENOMEM;
1373                 goto out;
1374         }
1375
1376         rc = next_entry(buf, fp, sizeof buf);
1377         if (rc < 0)
1378                 goto bad;
1379
1380         len = le32_to_cpu(buf[0]);
1381         levdatum->isalias = le32_to_cpu(buf[1]);
1382
1383         key = kmalloc(len + 1, GFP_ATOMIC);
1384         if (!key) {
1385                 rc = -ENOMEM;
1386                 goto bad;
1387         }
1388         rc = next_entry(key, fp, len);
1389         if (rc < 0)
1390                 goto bad;
1391         key[len] = 0;
1392
1393         levdatum->level = kmalloc(sizeof(struct mls_level), GFP_ATOMIC);
1394         if (!levdatum->level) {
1395                 rc = -ENOMEM;
1396                 goto bad;
1397         }
1398         if (mls_read_level(levdatum->level, fp)) {
1399                 rc = -EINVAL;
1400                 goto bad;
1401         }
1402
1403         rc = hashtab_insert(h, key, levdatum);
1404         if (rc)
1405                 goto bad;
1406 out:
1407         return rc;
1408 bad:
1409         sens_destroy(key, levdatum, NULL);
1410         goto out;
1411 }
1412
1413 static int cat_read(struct policydb *p, struct hashtab *h, void *fp)
1414 {
1415         char *key = NULL;
1416         struct cat_datum *catdatum;
1417         int rc;
1418         __le32 buf[3];
1419         u32 len;
1420
1421         catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC);
1422         if (!catdatum) {
1423                 rc = -ENOMEM;
1424                 goto out;
1425         }
1426
1427         rc = next_entry(buf, fp, sizeof buf);
1428         if (rc < 0)
1429                 goto bad;
1430
1431         len = le32_to_cpu(buf[0]);
1432         catdatum->value = le32_to_cpu(buf[1]);
1433         catdatum->isalias = le32_to_cpu(buf[2]);
1434
1435         key = kmalloc(len + 1, GFP_ATOMIC);
1436         if (!key) {
1437                 rc = -ENOMEM;
1438                 goto bad;
1439         }
1440         rc = next_entry(key, fp, len);
1441         if (rc < 0)
1442                 goto bad;
1443         key[len] = 0;
1444
1445         rc = hashtab_insert(h, key, catdatum);
1446         if (rc)
1447                 goto bad;
1448 out:
1449         return rc;
1450
1451 bad:
1452         cat_destroy(key, catdatum, NULL);
1453         goto out;
1454 }
1455
1456 static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, void *fp) =
1457 {
1458         common_read,
1459         class_read,
1460         role_read,
1461         type_read,
1462         user_read,
1463         cond_read_bool,
1464         sens_read,
1465         cat_read,
1466 };
1467
1468 extern int ss_initialized;
1469
1470 /*
1471  * Read the configuration data from a policy database binary
1472  * representation file into a policy database structure.
1473  */
1474 int policydb_read(struct policydb *p, void *fp)
1475 {
1476         struct role_allow *ra, *lra;
1477         struct role_trans *tr, *ltr;
1478         struct ocontext *l, *c, *newc;
1479         struct genfs *genfs_p, *genfs, *newgenfs;
1480         int i, j, rc;
1481         __le32 buf[8];
1482         u32 len, len2, config, nprim, nel, nel2;
1483         char *policydb_str;
1484         struct policydb_compat_info *info;
1485         struct range_trans *rt, *lrt;
1486
1487         config = 0;
1488
1489         rc = policydb_init(p);
1490         if (rc)
1491                 goto out;
1492
1493         /* Read the magic number and string length. */
1494         rc = next_entry(buf, fp, sizeof(u32) * 2);
1495         if (rc < 0)
1496                 goto bad;
1497
1498         if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
1499                 printk(KERN_ERR "SELinux:  policydb magic number 0x%x does "
1500                        "not match expected magic number 0x%x\n",
1501                        le32_to_cpu(buf[0]), POLICYDB_MAGIC);
1502                 goto bad;
1503         }
1504
1505         len = le32_to_cpu(buf[1]);
1506         if (len != strlen(POLICYDB_STRING)) {
1507                 printk(KERN_ERR "SELinux:  policydb string length %d does not "
1508                        "match expected length %Zu\n",
1509                        len, strlen(POLICYDB_STRING));
1510                 goto bad;
1511         }
1512         policydb_str = kmalloc(len + 1, GFP_KERNEL);
1513         if (!policydb_str) {
1514                 printk(KERN_ERR "SELinux:  unable to allocate memory for policydb "
1515                        "string of length %d\n", len);
1516                 rc = -ENOMEM;
1517                 goto bad;
1518         }
1519         rc = next_entry(policydb_str, fp, len);
1520         if (rc < 0) {
1521                 printk(KERN_ERR "SELinux:  truncated policydb string identifier\n");
1522                 kfree(policydb_str);
1523                 goto bad;
1524         }
1525         policydb_str[len] = 0;
1526         if (strcmp(policydb_str, POLICYDB_STRING)) {
1527                 printk(KERN_ERR "SELinux:  policydb string %s does not match "
1528                        "my string %s\n", policydb_str, POLICYDB_STRING);
1529                 kfree(policydb_str);
1530                 goto bad;
1531         }
1532         /* Done with policydb_str. */
1533         kfree(policydb_str);
1534         policydb_str = NULL;
1535
1536         /* Read the version, config, and table sizes. */
1537         rc = next_entry(buf, fp, sizeof(u32)*4);
1538         if (rc < 0)
1539                 goto bad;
1540
1541         p->policyvers = le32_to_cpu(buf[0]);
1542         if (p->policyvers < POLICYDB_VERSION_MIN ||
1543             p->policyvers > POLICYDB_VERSION_MAX) {
1544                 printk(KERN_ERR "SELinux:  policydb version %d does not match "
1545                        "my version range %d-%d\n",
1546                        le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
1547                 goto bad;
1548         }
1549
1550         if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
1551                 if (ss_initialized && !selinux_mls_enabled) {
1552                         printk(KERN_ERR "SELinux: Cannot switch between non-MLS"
1553                                 " and MLS policies\n");
1554                         goto bad;
1555                 }
1556                 selinux_mls_enabled = 1;
1557                 config |= POLICYDB_CONFIG_MLS;
1558
1559                 if (p->policyvers < POLICYDB_VERSION_MLS) {
1560                         printk(KERN_ERR "SELinux: security policydb version %d "
1561                                 "(MLS) not backwards compatible\n",
1562                                 p->policyvers);
1563                         goto bad;
1564                 }
1565         } else {
1566                 if (ss_initialized && selinux_mls_enabled) {
1567                         printk(KERN_ERR "SELinux: Cannot switch between MLS and"
1568                                 " non-MLS policies\n");
1569                         goto bad;
1570                 }
1571         }
1572         p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
1573         p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
1574
1575         if (p->policyvers >= POLICYDB_VERSION_POLCAP &&
1576             ebitmap_read(&p->policycaps, fp) != 0)
1577                 goto bad;
1578
1579         if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE &&
1580             ebitmap_read(&p->permissive_map, fp) != 0)
1581                 goto bad;
1582
1583         info = policydb_lookup_compat(p->policyvers);
1584         if (!info) {
1585                 printk(KERN_ERR "SELinux:  unable to find policy compat info "
1586                        "for version %d\n", p->policyvers);
1587                 goto bad;
1588         }
1589
1590         if (le32_to_cpu(buf[2]) != info->sym_num ||
1591                 le32_to_cpu(buf[3]) != info->ocon_num) {
1592                 printk(KERN_ERR "SELinux:  policydb table sizes (%d,%d) do "
1593                        "not match mine (%d,%d)\n", le32_to_cpu(buf[2]),
1594                         le32_to_cpu(buf[3]),
1595                        info->sym_num, info->ocon_num);
1596                 goto bad;
1597         }
1598
1599         for (i = 0; i < info->sym_num; i++) {
1600                 rc = next_entry(buf, fp, sizeof(u32)*2);
1601                 if (rc < 0)
1602                         goto bad;
1603                 nprim = le32_to_cpu(buf[0]);
1604                 nel = le32_to_cpu(buf[1]);
1605                 for (j = 0; j < nel; j++) {
1606                         rc = read_f[i](p, p->symtab[i].table, fp);
1607                         if (rc)
1608                                 goto bad;
1609                 }
1610
1611                 p->symtab[i].nprim = nprim;
1612         }
1613
1614         rc = avtab_read(&p->te_avtab, fp, p);
1615         if (rc)
1616                 goto bad;
1617
1618         if (p->policyvers >= POLICYDB_VERSION_BOOL) {
1619                 rc = cond_read_list(p, fp);
1620                 if (rc)
1621                         goto bad;
1622         }
1623
1624         rc = next_entry(buf, fp, sizeof(u32));
1625         if (rc < 0)
1626                 goto bad;
1627         nel = le32_to_cpu(buf[0]);
1628         ltr = NULL;
1629         for (i = 0; i < nel; i++) {
1630                 tr = kzalloc(sizeof(*tr), GFP_KERNEL);
1631                 if (!tr) {
1632                         rc = -ENOMEM;
1633                         goto bad;
1634                 }
1635                 if (ltr)
1636                         ltr->next = tr;
1637                 else
1638                         p->role_tr = tr;
1639                 rc = next_entry(buf, fp, sizeof(u32)*3);
1640                 if (rc < 0)
1641                         goto bad;
1642                 tr->role = le32_to_cpu(buf[0]);
1643                 tr->type = le32_to_cpu(buf[1]);
1644                 tr->new_role = le32_to_cpu(buf[2]);
1645                 if (!policydb_role_isvalid(p, tr->role) ||
1646                     !policydb_type_isvalid(p, tr->type) ||
1647                     !policydb_role_isvalid(p, tr->new_role)) {
1648                         rc = -EINVAL;
1649                         goto bad;
1650                 }
1651                 ltr = tr;
1652         }
1653
1654         rc = next_entry(buf, fp, sizeof(u32));
1655         if (rc < 0)
1656                 goto bad;
1657         nel = le32_to_cpu(buf[0]);
1658         lra = NULL;
1659         for (i = 0; i < nel; i++) {
1660                 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
1661                 if (!ra) {
1662                         rc = -ENOMEM;
1663                         goto bad;
1664                 }
1665                 if (lra)
1666                         lra->next = ra;
1667                 else
1668                         p->role_allow = ra;
1669                 rc = next_entry(buf, fp, sizeof(u32)*2);
1670                 if (rc < 0)
1671                         goto bad;
1672                 ra->role = le32_to_cpu(buf[0]);
1673                 ra->new_role = le32_to_cpu(buf[1]);
1674                 if (!policydb_role_isvalid(p, ra->role) ||
1675                     !policydb_role_isvalid(p, ra->new_role)) {
1676                         rc = -EINVAL;
1677                         goto bad;
1678                 }
1679                 lra = ra;
1680         }
1681
1682         rc = policydb_index_classes(p);
1683         if (rc)
1684                 goto bad;
1685
1686         rc = policydb_index_others(p);
1687         if (rc)
1688                 goto bad;
1689
1690         for (i = 0; i < info->ocon_num; i++) {
1691                 rc = next_entry(buf, fp, sizeof(u32));
1692                 if (rc < 0)
1693                         goto bad;
1694                 nel = le32_to_cpu(buf[0]);
1695                 l = NULL;
1696                 for (j = 0; j < nel; j++) {
1697                         c = kzalloc(sizeof(*c), GFP_KERNEL);
1698                         if (!c) {
1699                                 rc = -ENOMEM;
1700                                 goto bad;
1701                         }
1702                         if (l)
1703                                 l->next = c;
1704                         else
1705                                 p->ocontexts[i] = c;
1706                         l = c;
1707                         rc = -EINVAL;
1708                         switch (i) {
1709                         case OCON_ISID:
1710                                 rc = next_entry(buf, fp, sizeof(u32));
1711                                 if (rc < 0)
1712                                         goto bad;
1713                                 c->sid[0] = le32_to_cpu(buf[0]);
1714                                 rc = context_read_and_validate(&c->context[0], p, fp);
1715                                 if (rc)
1716                                         goto bad;
1717                                 break;
1718                         case OCON_FS:
1719                         case OCON_NETIF:
1720                                 rc = next_entry(buf, fp, sizeof(u32));
1721                                 if (rc < 0)
1722                                         goto bad;
1723                                 len = le32_to_cpu(buf[0]);
1724                                 c->u.name = kmalloc(len + 1, GFP_KERNEL);
1725                                 if (!c->u.name) {
1726                                         rc = -ENOMEM;
1727                                         goto bad;
1728                                 }
1729                                 rc = next_entry(c->u.name, fp, len);
1730                                 if (rc < 0)
1731                                         goto bad;
1732                                 c->u.name[len] = 0;
1733                                 rc = context_read_and_validate(&c->context[0], p, fp);
1734                                 if (rc)
1735                                         goto bad;
1736                                 rc = context_read_and_validate(&c->context[1], p, fp);
1737                                 if (rc)
1738                                         goto bad;
1739                                 break;
1740                         case OCON_PORT:
1741                                 rc = next_entry(buf, fp, sizeof(u32)*3);
1742                                 if (rc < 0)
1743                                         goto bad;
1744                                 c->u.port.protocol = le32_to_cpu(buf[0]);
1745                                 c->u.port.low_port = le32_to_cpu(buf[1]);
1746                                 c->u.port.high_port = le32_to_cpu(buf[2]);
1747                                 rc = context_read_and_validate(&c->context[0], p, fp);
1748                                 if (rc)
1749                                         goto bad;
1750                                 break;
1751                         case OCON_NODE:
1752                                 rc = next_entry(buf, fp, sizeof(u32) * 2);
1753                                 if (rc < 0)
1754                                         goto bad;
1755                                 c->u.node.addr = le32_to_cpu(buf[0]);
1756                                 c->u.node.mask = le32_to_cpu(buf[1]);
1757                                 rc = context_read_and_validate(&c->context[0], p, fp);
1758                                 if (rc)
1759                                         goto bad;
1760                                 break;
1761                         case OCON_FSUSE:
1762                                 rc = next_entry(buf, fp, sizeof(u32)*2);
1763                                 if (rc < 0)
1764                                         goto bad;
1765                                 c->v.behavior = le32_to_cpu(buf[0]);
1766                                 if (c->v.behavior > SECURITY_FS_USE_NONE)
1767                                         goto bad;
1768                                 len = le32_to_cpu(buf[1]);
1769                                 c->u.name = kmalloc(len + 1, GFP_KERNEL);
1770                                 if (!c->u.name) {
1771                                         rc = -ENOMEM;
1772                                         goto bad;
1773                                 }
1774                                 rc = next_entry(c->u.name, fp, len);
1775                                 if (rc < 0)
1776                                         goto bad;
1777                                 c->u.name[len] = 0;
1778                                 rc = context_read_and_validate(&c->context[0], p, fp);
1779                                 if (rc)
1780                                         goto bad;
1781                                 break;
1782                         case OCON_NODE6: {
1783                                 int k;
1784
1785                                 rc = next_entry(buf, fp, sizeof(u32) * 8);
1786                                 if (rc < 0)
1787                                         goto bad;
1788                                 for (k = 0; k < 4; k++)
1789                                         c->u.node6.addr[k] = le32_to_cpu(buf[k]);
1790                                 for (k = 0; k < 4; k++)
1791                                         c->u.node6.mask[k] = le32_to_cpu(buf[k+4]);
1792                                 if (context_read_and_validate(&c->context[0], p, fp))
1793                                         goto bad;
1794                                 break;
1795                         }
1796                         }
1797                 }
1798         }
1799
1800         rc = next_entry(buf, fp, sizeof(u32));
1801         if (rc < 0)
1802                 goto bad;
1803         nel = le32_to_cpu(buf[0]);
1804         genfs_p = NULL;
1805         rc = -EINVAL;
1806         for (i = 0; i < nel; i++) {
1807                 rc = next_entry(buf, fp, sizeof(u32));
1808                 if (rc < 0)
1809                         goto bad;
1810                 len = le32_to_cpu(buf[0]);
1811                 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
1812                 if (!newgenfs) {
1813                         rc = -ENOMEM;
1814                         goto bad;
1815                 }
1816
1817                 newgenfs->fstype = kmalloc(len + 1, GFP_KERNEL);
1818                 if (!newgenfs->fstype) {
1819                         rc = -ENOMEM;
1820                         kfree(newgenfs);
1821                         goto bad;
1822                 }
1823                 rc = next_entry(newgenfs->fstype, fp, len);
1824                 if (rc < 0) {
1825                         kfree(newgenfs->fstype);
1826                         kfree(newgenfs);
1827                         goto bad;
1828                 }
1829                 newgenfs->fstype[len] = 0;
1830                 for (genfs_p = NULL, genfs = p->genfs; genfs;
1831                      genfs_p = genfs, genfs = genfs->next) {
1832                         if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
1833                                 printk(KERN_ERR "SELinux:  dup genfs "
1834                                        "fstype %s\n", newgenfs->fstype);
1835                                 kfree(newgenfs->fstype);
1836                                 kfree(newgenfs);
1837                                 goto bad;
1838                         }
1839                         if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
1840                                 break;
1841                 }
1842                 newgenfs->next = genfs;
1843                 if (genfs_p)
1844                         genfs_p->next = newgenfs;
1845                 else
1846                         p->genfs = newgenfs;
1847                 rc = next_entry(buf, fp, sizeof(u32));
1848                 if (rc < 0)
1849                         goto bad;
1850                 nel2 = le32_to_cpu(buf[0]);
1851                 for (j = 0; j < nel2; j++) {
1852                         rc = next_entry(buf, fp, sizeof(u32));
1853                         if (rc < 0)
1854                                 goto bad;
1855                         len = le32_to_cpu(buf[0]);
1856
1857                         newc = kzalloc(sizeof(*newc), GFP_KERNEL);
1858                         if (!newc) {
1859                                 rc = -ENOMEM;
1860                                 goto bad;
1861                         }
1862
1863                         newc->u.name = kmalloc(len + 1, GFP_KERNEL);
1864                         if (!newc->u.name) {
1865                                 rc = -ENOMEM;
1866                                 goto bad_newc;
1867                         }
1868                         rc = next_entry(newc->u.name, fp, len);
1869                         if (rc < 0)
1870                                 goto bad_newc;
1871                         newc->u.name[len] = 0;
1872                         rc = next_entry(buf, fp, sizeof(u32));
1873                         if (rc < 0)
1874                                 goto bad_newc;
1875                         newc->v.sclass = le32_to_cpu(buf[0]);
1876                         if (context_read_and_validate(&newc->context[0], p, fp))
1877                                 goto bad_newc;
1878                         for (l = NULL, c = newgenfs->head; c;
1879                              l = c, c = c->next) {
1880                                 if (!strcmp(newc->u.name, c->u.name) &&
1881                                     (!c->v.sclass || !newc->v.sclass ||
1882                                      newc->v.sclass == c->v.sclass)) {
1883                                         printk(KERN_ERR "SELinux:  dup genfs "
1884                                                "entry (%s,%s)\n",
1885                                                newgenfs->fstype, c->u.name);
1886                                         goto bad_newc;
1887                                 }
1888                                 len = strlen(newc->u.name);
1889                                 len2 = strlen(c->u.name);
1890                                 if (len > len2)
1891                                         break;
1892                         }
1893
1894                         newc->next = c;
1895                         if (l)
1896                                 l->next = newc;
1897                         else
1898                                 newgenfs->head = newc;
1899                 }
1900         }
1901
1902         if (p->policyvers >= POLICYDB_VERSION_MLS) {
1903                 int new_rangetr = p->policyvers >= POLICYDB_VERSION_RANGETRANS;
1904                 rc = next_entry(buf, fp, sizeof(u32));
1905                 if (rc < 0)
1906                         goto bad;
1907                 nel = le32_to_cpu(buf[0]);
1908                 lrt = NULL;
1909                 for (i = 0; i < nel; i++) {
1910                         rt = kzalloc(sizeof(*rt), GFP_KERNEL);
1911                         if (!rt) {
1912                                 rc = -ENOMEM;
1913                                 goto bad;
1914                         }
1915                         if (lrt)
1916                                 lrt->next = rt;
1917                         else
1918                                 p->range_tr = rt;
1919                         rc = next_entry(buf, fp, (sizeof(u32) * 2));
1920                         if (rc < 0)
1921                                 goto bad;
1922                         rt->source_type = le32_to_cpu(buf[0]);
1923                         rt->target_type = le32_to_cpu(buf[1]);
1924                         if (new_rangetr) {
1925                                 rc = next_entry(buf, fp, sizeof(u32));
1926                                 if (rc < 0)
1927                                         goto bad;
1928                                 rt->target_class = le32_to_cpu(buf[0]);
1929                         } else
1930                                 rt->target_class = SECCLASS_PROCESS;
1931                         if (!policydb_type_isvalid(p, rt->source_type) ||
1932                             !policydb_type_isvalid(p, rt->target_type) ||
1933                             !policydb_class_isvalid(p, rt->target_class)) {
1934                                 rc = -EINVAL;
1935                                 goto bad;
1936                         }
1937                         rc = mls_read_range_helper(&rt->target_range, fp);
1938                         if (rc)
1939                                 goto bad;
1940                         if (!mls_range_isvalid(p, &rt->target_range)) {
1941                                 printk(KERN_WARNING "SELinux:  rangetrans:  invalid range\n");
1942                                 goto bad;
1943                         }
1944                         lrt = rt;
1945                 }
1946         }
1947
1948         p->type_attr_map = kmalloc(p->p_types.nprim*sizeof(struct ebitmap), GFP_KERNEL);
1949         if (!p->type_attr_map)
1950                 goto bad;
1951
1952         for (i = 0; i < p->p_types.nprim; i++) {
1953                 ebitmap_init(&p->type_attr_map[i]);
1954                 if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
1955                         if (ebitmap_read(&p->type_attr_map[i], fp))
1956                                 goto bad;
1957                 }
1958                 /* add the type itself as the degenerate case */
1959                 if (ebitmap_set_bit(&p->type_attr_map[i], i, 1))
1960                                 goto bad;
1961         }
1962
1963         rc = 0;
1964 out:
1965         return rc;
1966 bad_newc:
1967         ocontext_destroy(newc, OCON_FSUSE);
1968 bad:
1969         if (!rc)
1970                 rc = -EINVAL;
1971         policydb_destroy(p);
1972         goto out;
1973 }