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