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@paul-moore.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 <linux/audit.h>
  34 #include <linux/flex_array.h>
  35 #include "security.h"
  36
  37 #include "policydb.h"
  38 #include "conditional.h"
  39 #include "mls.h"
  40 #include "services.h"
  41
  42 #define _DEBUG_HASHES
  43
  44 #ifdef DEBUG_HASHES
  45 static const char *symtab_name[SYM_NUM] = {
  46         "common prefixes",
  47         "classes",
  48         "roles",
  49         "types",
  50         "users",
  51         "bools",
  52         "levels",
  53         "categories",
  54 };
  55 #endif
  56
  57 static unsigned int symtab_sizes[SYM_NUM] = {
  58         2,
  59         32,
  60         16,
  61         512,
  62         128,
  63         16,
  64         16,
  65         16,
  66 };
  67
  68 struct policydb_compat_info {
  69         int version;
  70         int sym_num;
  71         int ocon_num;
  72 };
  73
  74 /* These need to be updated if SYM_NUM or OCON_NUM changes */
  75 static struct policydb_compat_info policydb_compat[] = {
  76         {
  77                 .version        = POLICYDB_VERSION_BASE,
  78                 .sym_num        = SYM_NUM - 3,
  79                 .ocon_num       = OCON_NUM - 1,
  80         },
  81         {
  82                 .version        = POLICYDB_VERSION_BOOL,
  83                 .sym_num        = SYM_NUM - 2,
  84                 .ocon_num       = OCON_NUM - 1,
  85         },
  86         {
  87                 .version        = POLICYDB_VERSION_IPV6,
  88                 .sym_num        = SYM_NUM - 2,
  89                 .ocon_num       = OCON_NUM,
  90         },
  91         {
  92                 .version        = POLICYDB_VERSION_NLCLASS,
  93                 .sym_num        = SYM_NUM - 2,
  94                 .ocon_num       = OCON_NUM,
  95         },
  96         {
  97                 .version        = POLICYDB_VERSION_MLS,
  98                 .sym_num        = SYM_NUM,
  99                 .ocon_num       = OCON_NUM,
 100         },
 101         {
 102                 .version        = POLICYDB_VERSION_AVTAB,
 103                 .sym_num        = SYM_NUM,
 104                 .ocon_num       = OCON_NUM,
 105         },
 106         {
 107                 .version        = POLICYDB_VERSION_RANGETRANS,
 108                 .sym_num        = SYM_NUM,
 109                 .ocon_num       = OCON_NUM,
 110         },
 111         {
 112                 .version        = POLICYDB_VERSION_POLCAP,
 113                 .sym_num        = SYM_NUM,
 114                 .ocon_num       = OCON_NUM,
 115         },
 116         {
 117                 .version        = POLICYDB_VERSION_PERMISSIVE,
 118                 .sym_num        = SYM_NUM,
 119                 .ocon_num       = OCON_NUM,
 120         },
 121         {
 122                 .version        = POLICYDB_VERSION_BOUNDARY,
 123                 .sym_num        = SYM_NUM,
 124                 .ocon_num       = OCON_NUM,
 125         },
 126         {
 127                 .version        = POLICYDB_VERSION_FILENAME_TRANS,
 128                 .sym_num        = SYM_NUM,
 129                 .ocon_num       = OCON_NUM,
 130         },
 131         {
 132                 .version        = POLICYDB_VERSION_ROLETRANS,
 133                 .sym_num        = SYM_NUM,
 134                 .ocon_num       = OCON_NUM,
 135         },
 136         {
 137                 .version        = POLICYDB_VERSION_NEW_OBJECT_DEFAULTS,
 138                 .sym_num        = SYM_NUM,
 139                 .ocon_num       = OCON_NUM,
 140         },
 141         {
 142                 .version        = POLICYDB_VERSION_DEFAULT_TYPE,
 143                 .sym_num        = SYM_NUM,
 144                 .ocon_num       = OCON_NUM,
 145         },
 146         {
 147                 .version        = POLICYDB_VERSION_CONSTRAINT_NAMES,
 148                 .sym_num        = SYM_NUM,
 149                 .ocon_num       = OCON_NUM,
 150         },
 151 };
 152
 153 static struct policydb_compat_info *policydb_lookup_compat(int version)
 154 {
 155         int i;
 156         struct policydb_compat_info *info = NULL;
 157
 158         for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) {
 159                 if (policydb_compat[i].version == version) {
 160                         info = &policydb_compat[i];
 161                         break;
 162                 }
 163         }
 164         return info;
 165 }
 166
 167 /*
 168  * Initialize the role table.
 169  */
 170 static int roles_init(struct policydb *p)
 171 {
 172         char *key = NULL;
 173         int rc;
 174         struct role_datum *role;
 175
 176         rc = -ENOMEM;
 177         role = kzalloc(sizeof(*role), GFP_KERNEL);
 178         if (!role)
 179                 goto out;
 180
 181         rc = -EINVAL;
 182         role->value = ++p->p_roles.nprim;
 183         if (role->value != OBJECT_R_VAL)
 184                 goto out;
 185
 186         rc = -ENOMEM;
 187         key = kstrdup(OBJECT_R, GFP_KERNEL);
 188         if (!key)
 189                 goto out;
 190
 191         rc = hashtab_insert(p->p_roles.table, key, role);
 192         if (rc)
 193                 goto out;
 194
 195         return 0;
 196 out:
 197         kfree(key);
 198         kfree(role);
 199         return rc;
 200 }
 201
 202 static u32 filenametr_hash(struct hashtab *h, const void *k)
 203 {
 204         const struct filename_trans *ft = k;
 205         unsigned long hash;
 206         unsigned int byte_num;
 207         unsigned char focus;
 208
 209         hash = ft->stype ^ ft->ttype ^ ft->tclass;
 210
 211         byte_num = 0;
 212         while ((focus = ft->name[byte_num++]))
 213                 hash = partial_name_hash(focus, hash);
 214         return hash & (h->size - 1);
 215 }
 216
 217 static int filenametr_cmp(struct hashtab *h, const void *k1, const void *k2)
 218 {
 219         const struct filename_trans *ft1 = k1;
 220         const struct filename_trans *ft2 = k2;
 221         int v;
 222
 223         v = ft1->stype - ft2->stype;
 224         if (v)
 225                 return v;
 226
 227         v = ft1->ttype - ft2->ttype;
 228         if (v)
 229                 return v;
 230
 231         v = ft1->tclass - ft2->tclass;
 232         if (v)
 233                 return v;
 234
 235         return strcmp(ft1->name, ft2->name);
 236
 237 }
 238
 239 static u32 rangetr_hash(struct hashtab *h, const void *k)
 240 {
 241         const struct range_trans *key = k;
 242         return (key->source_type + (key->target_type << 3) +
 243                 (key->target_class << 5)) & (h->size - 1);
 244 }
 245
 246 static int rangetr_cmp(struct hashtab *h, const void *k1, const void *k2)
 247 {
 248         const struct range_trans *key1 = k1, *key2 = k2;
 249         int v;
 250
 251         v = key1->source_type - key2->source_type;
 252         if (v)
 253                 return v;
 254
 255         v = key1->target_type - key2->target_type;
 256         if (v)
 257                 return v;
 258
 259         v = key1->target_class - key2->target_class;
 260
 261         return v;
 262 }
 263
 264 /*
 265  * Initialize a policy database structure.
 266  */
 267 static int policydb_init(struct policydb *p)
 268 {
 269         int i, rc;
 270
 271         memset(p, 0, sizeof(*p));
 272
 273         for (i = 0; i < SYM_NUM; i++) {
 274                 rc = symtab_init(&p->symtab[i], symtab_sizes[i]);
 275                 if (rc)
 276                         goto out;
 277         }
 278
 279         rc = avtab_init(&p->te_avtab);
 280         if (rc)
 281                 goto out;
 282
 283         rc = roles_init(p);
 284         if (rc)
 285                 goto out;
 286
 287         rc = cond_policydb_init(p);
 288         if (rc)
 289                 goto out;
 290
 291         p->filename_trans = hashtab_create(filenametr_hash, filenametr_cmp, (1 << 10));
 292         if (!p->filename_trans)
 293                 goto out;
 294
 295         p->range_tr = hashtab_create(rangetr_hash, rangetr_cmp, 256);
 296         if (!p->range_tr)
 297                 goto out;
 298
 299         ebitmap_init(&p->filename_trans_ttypes);
 300         ebitmap_init(&p->policycaps);
 301         ebitmap_init(&p->permissive_map);
 302
 303         return 0;
 304 out:
 305         hashtab_destroy(p->filename_trans);
 306         hashtab_destroy(p->range_tr);
 307         for (i = 0; i < SYM_NUM; i++)
 308                 hashtab_destroy(p->symtab[i].table);
 309         return rc;
 310 }
 311
 312 /*
 313  * The following *_index functions are used to
 314  * define the val_to_name and val_to_struct arrays
 315  * in a policy database structure.  The val_to_name
 316  * arrays are used when converting security context
 317  * structures into string representations.  The
 318  * val_to_struct arrays are used when the attributes
 319  * of a class, role, or user are needed.
 320  */
 321
 322 static int common_index(void *key, void *datum, void *datap)
 323 {
 324         struct policydb *p;
 325         struct common_datum *comdatum;
 326         struct flex_array *fa;
 327
 328         comdatum = datum;
 329         p = datap;
 330         if (!comdatum->value || comdatum->value > p->p_commons.nprim)
 331                 return -EINVAL;
 332
 333         fa = p->sym_val_to_name[SYM_COMMONS];
 334         if (flex_array_put_ptr(fa, comdatum->value - 1, key,
 335                                GFP_KERNEL | __GFP_ZERO))
 336                 BUG();
 337         return 0;
 338 }
 339
 340 static int class_index(void *key, void *datum, void *datap)
 341 {
 342         struct policydb *p;
 343         struct class_datum *cladatum;
 344         struct flex_array *fa;
 345
 346         cladatum = datum;
 347         p = datap;
 348         if (!cladatum->value || cladatum->value > p->p_classes.nprim)
 349                 return -EINVAL;
 350         fa = p->sym_val_to_name[SYM_CLASSES];
 351         if (flex_array_put_ptr(fa, cladatum->value - 1, key,
 352                                GFP_KERNEL | __GFP_ZERO))
 353                 BUG();
 354         p->class_val_to_struct[cladatum->value - 1] = cladatum;
 355         return 0;
 356 }
 357
 358 static int role_index(void *key, void *datum, void *datap)
 359 {
 360         struct policydb *p;
 361         struct role_datum *role;
 362         struct flex_array *fa;
 363
 364         role = datum;
 365         p = datap;
 366         if (!role->value
 367             || role->value > p->p_roles.nprim
 368             || role->bounds > p->p_roles.nprim)
 369                 return -EINVAL;
 370
 371         fa = p->sym_val_to_name[SYM_ROLES];
 372         if (flex_array_put_ptr(fa, role->value - 1, key,
 373                                GFP_KERNEL | __GFP_ZERO))
 374                 BUG();
 375         p->role_val_to_struct[role->value - 1] = role;
 376         return 0;
 377 }
 378
 379 static int type_index(void *key, void *datum, void *datap)
 380 {
 381         struct policydb *p;
 382         struct type_datum *typdatum;
 383         struct flex_array *fa;
 384
 385         typdatum = datum;
 386         p = datap;
 387
 388         if (typdatum->primary) {
 389                 if (!typdatum->value
 390                     || typdatum->value > p->p_types.nprim
 391                     || typdatum->bounds > p->p_types.nprim)
 392                         return -EINVAL;
 393                 fa = p->sym_val_to_name[SYM_TYPES];
 394                 if (flex_array_put_ptr(fa, typdatum->value - 1, key,
 395                                        GFP_KERNEL | __GFP_ZERO))
 396                         BUG();
 397
 398                 fa = p->type_val_to_struct_array;
 399                 if (flex_array_put_ptr(fa, typdatum->value - 1, typdatum,
 400                                        GFP_KERNEL | __GFP_ZERO))
 401                         BUG();
 402         }
 403
 404         return 0;
 405 }
 406
 407 static int user_index(void *key, void *datum, void *datap)
 408 {
 409         struct policydb *p;
 410         struct user_datum *usrdatum;
 411         struct flex_array *fa;
 412
 413         usrdatum = datum;
 414         p = datap;
 415         if (!usrdatum->value
 416             || usrdatum->value > p->p_users.nprim
 417             || usrdatum->bounds > p->p_users.nprim)
 418                 return -EINVAL;
 419
 420         fa = p->sym_val_to_name[SYM_USERS];
 421         if (flex_array_put_ptr(fa, usrdatum->value - 1, key,
 422                                GFP_KERNEL | __GFP_ZERO))
 423                 BUG();
 424         p->user_val_to_struct[usrdatum->value - 1] = usrdatum;
 425         return 0;
 426 }
 427
 428 static int sens_index(void *key, void *datum, void *datap)
 429 {
 430         struct policydb *p;
 431         struct level_datum *levdatum;
 432         struct flex_array *fa;
 433
 434         levdatum = datum;
 435         p = datap;
 436
 437         if (!levdatum->isalias) {
 438                 if (!levdatum->level->sens ||
 439                     levdatum->level->sens > p->p_levels.nprim)
 440                         return -EINVAL;
 441                 fa = p->sym_val_to_name[SYM_LEVELS];
 442                 if (flex_array_put_ptr(fa, levdatum->level->sens - 1, key,
 443                                        GFP_KERNEL | __GFP_ZERO))
 444                         BUG();
 445         }
 446
 447         return 0;
 448 }
 449
 450 static int cat_index(void *key, void *datum, void *datap)
 451 {
 452         struct policydb *p;
 453         struct cat_datum *catdatum;
 454         struct flex_array *fa;
 455
 456         catdatum = datum;
 457         p = datap;
 458
 459         if (!catdatum->isalias) {
 460                 if (!catdatum->value || catdatum->value > p->p_cats.nprim)
 461                         return -EINVAL;
 462                 fa = p->sym_val_to_name[SYM_CATS];
 463                 if (flex_array_put_ptr(fa, catdatum->value - 1, key,
 464                                        GFP_KERNEL | __GFP_ZERO))
 465                         BUG();
 466         }
 467
 468         return 0;
 469 }
 470
 471 static int (*index_f[SYM_NUM]) (void *key, void *datum, void *datap) =
 472 {
 473         common_index,
 474         class_index,
 475         role_index,
 476         type_index,
 477         user_index,
 478         cond_index_bool,
 479         sens_index,
 480         cat_index,
 481 };
 482
 483 #ifdef DEBUG_HASHES
 484 static void hash_eval(struct hashtab *h, const char *hash_name)
 485 {
 486         struct hashtab_info info;
 487
 488         hashtab_stat(h, &info);
 489         printk(KERN_DEBUG "SELinux: %s:  %d entries and %d/%d buckets used, "
 490                "longest chain length %d\n", hash_name, h->nel,
 491                info.slots_used, h->size, info.max_chain_len);
 492 }
 493
 494 static void symtab_hash_eval(struct symtab *s)
 495 {
 496         int i;
 497
 498         for (i = 0; i < SYM_NUM; i++)
 499                 hash_eval(s[i].table, symtab_name[i]);
 500 }
 501
 502 #else
 503 static inline void hash_eval(struct hashtab *h, char *hash_name)
 504 {
 505 }
 506 #endif
 507
 508 /*
 509  * Define the other val_to_name and val_to_struct arrays
 510  * in a policy database structure.
 511  *
 512  * Caller must clean up on failure.
 513  */
 514 static int policydb_index(struct policydb *p)
 515 {
 516         int i, rc;
 517
 518         printk(KERN_DEBUG "SELinux:  %d users, %d roles, %d types, %d bools",
 519                p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim, p->p_bools.nprim);
 520         if (p->mls_enabled)
 521                 printk(", %d sens, %d cats", p->p_levels.nprim,
 522                        p->p_cats.nprim);
 523         printk("\n");
 524
 525         printk(KERN_DEBUG "SELinux:  %d classes, %d rules\n",
 526                p->p_classes.nprim, p->te_avtab.nel);
 527
 528 #ifdef DEBUG_HASHES
 529         avtab_hash_eval(&p->te_avtab, "rules");
 530         symtab_hash_eval(p->symtab);
 531 #endif
 532
 533         rc = -ENOMEM;
 534         p->class_val_to_struct =
 535                 kmalloc(p->p_classes.nprim * sizeof(*(p->class_val_to_struct)),
 536                         GFP_KERNEL);
 537         if (!p->class_val_to_struct)
 538                 goto out;
 539
 540         rc = -ENOMEM;
 541         p->role_val_to_struct =
 542                 kmalloc(p->p_roles.nprim * sizeof(*(p->role_val_to_struct)),
 543                         GFP_KERNEL);
 544         if (!p->role_val_to_struct)
 545                 goto out;
 546
 547         rc = -ENOMEM;
 548         p->user_val_to_struct =
 549                 kmalloc(p->p_users.nprim * sizeof(*(p->user_val_to_struct)),
 550                         GFP_KERNEL);
 551         if (!p->user_val_to_struct)
 552                 goto out;
 553
 554         /* Yes, I want the sizeof the pointer, not the structure */
 555         rc = -ENOMEM;
 556         p->type_val_to_struct_array = flex_array_alloc(sizeof(struct type_datum *),
 557                                                        p->p_types.nprim,
 558                                                        GFP_KERNEL | __GFP_ZERO);
 559         if (!p->type_val_to_struct_array)
 560                 goto out;
 561
 562         rc = flex_array_prealloc(p->type_val_to_struct_array, 0,
 563                                  p->p_types.nprim, GFP_KERNEL | __GFP_ZERO);
 564         if (rc)
 565                 goto out;
 566
 567         rc = cond_init_bool_indexes(p);
 568         if (rc)
 569                 goto out;
 570
 571         for (i = 0; i < SYM_NUM; i++) {
 572                 rc = -ENOMEM;
 573                 p->sym_val_to_name[i] = flex_array_alloc(sizeof(char *),
 574                                                          p->symtab[i].nprim,
 575                                                          GFP_KERNEL | __GFP_ZERO);
 576                 if (!p->sym_val_to_name[i])
 577                         goto out;
 578
 579                 rc = flex_array_prealloc(p->sym_val_to_name[i],
 580                                          0, p->symtab[i].nprim,
 581                                          GFP_KERNEL | __GFP_ZERO);
 582                 if (rc)
 583                         goto out;
 584
 585                 rc = hashtab_map(p->symtab[i].table, index_f[i], p);
 586                 if (rc)
 587                         goto out;
 588         }
 589         rc = 0;
 590 out:
 591         return rc;
 592 }
 593
 594 /*
 595  * The following *_destroy functions are used to
 596  * free any memory allocated for each kind of
 597  * symbol data in the policy database.
 598  */
 599
 600 static int perm_destroy(void *key, void *datum, void *p)
 601 {
 602         kfree(key);
 603         kfree(datum);
 604         return 0;
 605 }
 606
 607 static int common_destroy(void *key, void *datum, void *p)
 608 {
 609         struct common_datum *comdatum;
 610
 611         kfree(key);
 612         if (datum) {
 613                 comdatum = datum;
 614                 hashtab_map(comdatum->permissions.table, perm_destroy, NULL);
 615                 hashtab_destroy(comdatum->permissions.table);
 616         }
 617         kfree(datum);
 618         return 0;
 619 }
 620
 621 static void constraint_expr_destroy(struct constraint_expr *expr)
 622 {
 623         if (expr) {
 624                 ebitmap_destroy(&expr->names);
 625                 if (expr->type_names) {
 626                         ebitmap_destroy(&expr->type_names->types);
 627                         ebitmap_destroy(&expr->type_names->negset);
 628                         kfree(expr->type_names);
 629                 }
 630                 kfree(expr);
 631         }
 632 }
 633
 634 static int cls_destroy(void *key, void *datum, void *p)
 635 {
 636         struct class_datum *cladatum;
 637         struct constraint_node *constraint, *ctemp;
 638         struct constraint_expr *e, *etmp;
 639
 640         kfree(key);
 641         if (datum) {
 642                 cladatum = datum;
 643                 hashtab_map(cladatum->permissions.table, perm_destroy, NULL);
 644                 hashtab_destroy(cladatum->permissions.table);
 645                 constraint = cladatum->constraints;
 646                 while (constraint) {
 647                         e = constraint->expr;
 648                         while (e) {
 649                                 etmp = e;
 650                                 e = e->next;
 651                                 constraint_expr_destroy(etmp);
 652                         }
 653                         ctemp = constraint;
 654                         constraint = constraint->next;
 655                         kfree(ctemp);
 656                 }
 657
 658                 constraint = cladatum->validatetrans;
 659                 while (constraint) {
 660                         e = constraint->expr;
 661                         while (e) {
 662                                 etmp = e;
 663                                 e = e->next;
 664                                 constraint_expr_destroy(etmp);
 665                         }
 666                         ctemp = constraint;
 667                         constraint = constraint->next;
 668                         kfree(ctemp);
 669                 }
 670                 kfree(cladatum->comkey);
 671         }
 672         kfree(datum);
 673         return 0;
 674 }
 675
 676 static int role_destroy(void *key, void *datum, void *p)
 677 {
 678         struct role_datum *role;
 679
 680         kfree(key);
 681         if (datum) {
 682                 role = datum;
 683                 ebitmap_destroy(&role->dominates);
 684                 ebitmap_destroy(&role->types);
 685         }
 686         kfree(datum);
 687         return 0;
 688 }
 689
 690 static int type_destroy(void *key, void *datum, void *p)
 691 {
 692         kfree(key);
 693         kfree(datum);
 694         return 0;
 695 }
 696
 697 static int user_destroy(void *key, void *datum, void *p)
 698 {
 699         struct user_datum *usrdatum;
 700
 701         kfree(key);
 702         if (datum) {
 703                 usrdatum = datum;
 704                 ebitmap_destroy(&usrdatum->roles);
 705                 ebitmap_destroy(&usrdatum->range.level[0].cat);
 706                 ebitmap_destroy(&usrdatum->range.level[1].cat);
 707                 ebitmap_destroy(&usrdatum->dfltlevel.cat);
 708         }
 709         kfree(datum);
 710         return 0;
 711 }
 712
 713 static int sens_destroy(void *key, void *datum, void *p)
 714 {
 715         struct level_datum *levdatum;
 716
 717         kfree(key);
 718         if (datum) {
 719                 levdatum = datum;
 720                 ebitmap_destroy(&levdatum->level->cat);
 721                 kfree(levdatum->level);
 722         }
 723         kfree(datum);
 724         return 0;
 725 }
 726
 727 static int cat_destroy(void *key, void *datum, void *p)
 728 {
 729         kfree(key);
 730         kfree(datum);
 731         return 0;
 732 }
 733
 734 static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) =
 735 {
 736         common_destroy,
 737         cls_destroy,
 738         role_destroy,
 739         type_destroy,
 740         user_destroy,
 741         cond_destroy_bool,
 742         sens_destroy,
 743         cat_destroy,
 744 };
 745
 746 static int filenametr_destroy(void *key, void *datum, void *p)
 747 {
 748         struct filename_trans *ft = key;
 749         kfree(ft->name);
 750         kfree(key);
 751         kfree(datum);
 752         cond_resched();
 753         return 0;
 754 }
 755
 756 static int range_tr_destroy(void *key, void *datum, void *p)
 757 {
 758         struct mls_range *rt = datum;
 759         kfree(key);
 760         ebitmap_destroy(&rt->level[0].cat);
 761         ebitmap_destroy(&rt->level[1].cat);
 762         kfree(datum);
 763         cond_resched();
 764         return 0;
 765 }
 766
 767 static void ocontext_destroy(struct ocontext *c, int i)
 768 {
 769         if (!c)
 770                 return;
 771
 772         context_destroy(&c->context[0]);
 773         context_destroy(&c->context[1]);
 774         if (i == OCON_ISID || i == OCON_FS ||
 775             i == OCON_NETIF || i == OCON_FSUSE)
 776                 kfree(c->u.name);
 777         kfree(c);
 778 }
 779
 780 /*
 781  * Free any memory allocated by a policy database structure.
 782  */
 783 void policydb_destroy(struct policydb *p)
 784 {
 785         struct ocontext *c, *ctmp;
 786         struct genfs *g, *gtmp;
 787         int i;
 788         struct role_allow *ra, *lra = NULL;
 789         struct role_trans *tr, *ltr = NULL;
 790
 791         for (i = 0; i < SYM_NUM; i++) {
 792                 cond_resched();
 793                 hashtab_map(p->symtab[i].table, destroy_f[i], NULL);
 794                 hashtab_destroy(p->symtab[i].table);
 795         }
 796
 797         for (i = 0; i < SYM_NUM; i++) {
 798                 if (p->sym_val_to_name[i])
 799                         flex_array_free(p->sym_val_to_name[i]);
 800         }
 801
 802         kfree(p->class_val_to_struct);
 803         kfree(p->role_val_to_struct);
 804         kfree(p->user_val_to_struct);
 805         if (p->type_val_to_struct_array)
 806                 flex_array_free(p->type_val_to_struct_array);
 807
 808         avtab_destroy(&p->te_avtab);
 809
 810         for (i = 0; i < OCON_NUM; i++) {
 811                 cond_resched();
 812                 c = p->ocontexts[i];
 813                 while (c) {
 814                         ctmp = c;
 815                         c = c->next;
 816                         ocontext_destroy(ctmp, i);
 817                 }
 818                 p->ocontexts[i] = NULL;
 819         }
 820
 821         g = p->genfs;
 822         while (g) {
 823                 cond_resched();
 824                 kfree(g->fstype);
 825                 c = g->head;
 826                 while (c) {
 827                         ctmp = c;
 828                         c = c->next;
 829                         ocontext_destroy(ctmp, OCON_FSUSE);
 830                 }
 831                 gtmp = g;
 832                 g = g->next;
 833                 kfree(gtmp);
 834         }
 835         p->genfs = NULL;
 836
 837         cond_policydb_destroy(p);
 838
 839         for (tr = p->role_tr; tr; tr = tr->next) {
 840                 cond_resched();
 841                 kfree(ltr);
 842                 ltr = tr;
 843         }
 844         kfree(ltr);
 845
 846         for (ra = p->role_allow; ra; ra = ra->next) {
 847                 cond_resched();
 848                 kfree(lra);
 849                 lra = ra;
 850         }
 851         kfree(lra);
 852
 853         hashtab_map(p->filename_trans, filenametr_destroy, NULL);
 854         hashtab_destroy(p->filename_trans);
 855
 856         hashtab_map(p->range_tr, range_tr_destroy, NULL);
 857         hashtab_destroy(p->range_tr);
 858
 859         if (p->type_attr_map_array) {
 860                 for (i = 0; i < p->p_types.nprim; i++) {
 861                         struct ebitmap *e;
 862
 863                         e = flex_array_get(p->type_attr_map_array, i);
 864                         if (!e)
 865                                 continue;
 866                         ebitmap_destroy(e);
 867                 }
 868                 flex_array_free(p->type_attr_map_array);
 869         }
 870
 871         ebitmap_destroy(&p->filename_trans_ttypes);
 872         ebitmap_destroy(&p->policycaps);
 873         ebitmap_destroy(&p->permissive_map);
 874
 875         return;
 876 }
 877
 878 /*
 879  * Load the initial SIDs specified in a policy database
 880  * structure into a SID table.
 881  */
 882 int policydb_load_isids(struct policydb *p, struct sidtab *s)
 883 {
 884         struct ocontext *head, *c;
 885         int rc;
 886
 887         rc = sidtab_init(s);
 888         if (rc) {
 889                 printk(KERN_ERR "SELinux:  out of memory on SID table init\n");
 890                 goto out;
 891         }
 892
 893         head = p->ocontexts[OCON_ISID];
 894         for (c = head; c; c = c->next) {
 895                 rc = -EINVAL;
 896                 if (!c->context[0].user) {
 897                         printk(KERN_ERR "SELinux:  SID %s was never defined.\n",
 898                                 c->u.name);
 899                         goto out;
 900                 }
 901
 902                 rc = sidtab_insert(s, c->sid[0], &c->context[0]);
 903                 if (rc) {
 904                         printk(KERN_ERR "SELinux:  unable to load initial SID %s.\n",
 905                                 c->u.name);
 906                         goto out;
 907                 }
 908         }
 909         rc = 0;
 910 out:
 911         return rc;
 912 }
 913
 914 int policydb_class_isvalid(struct policydb *p, unsigned int class)
 915 {
 916         if (!class || class > p->p_classes.nprim)
 917                 return 0;
 918         return 1;
 919 }
 920
 921 int policydb_role_isvalid(struct policydb *p, unsigned int role)
 922 {
 923         if (!role || role > p->p_roles.nprim)
 924                 return 0;
 925         return 1;
 926 }
 927
 928 int policydb_type_isvalid(struct policydb *p, unsigned int type)
 929 {
 930         if (!type || type > p->p_types.nprim)
 931                 return 0;
 932         return 1;
 933 }
 934
 935 /*
 936  * Return 1 if the fields in the security context
 937  * structure `c' are valid.  Return 0 otherwise.
 938  */
 939 int policydb_context_isvalid(struct policydb *p, struct context *c)
 940 {
 941         struct role_datum *role;
 942         struct user_datum *usrdatum;
 943
 944         if (!c->role || c->role > p->p_roles.nprim)
 945                 return 0;
 946
 947         if (!c->user || c->user > p->p_users.nprim)
 948                 return 0;
 949
 950         if (!c->type || c->type > p->p_types.nprim)
 951                 return 0;
 952
 953         if (c->role != OBJECT_R_VAL) {
 954                 /*
 955                  * Role must be authorized for the type.
 956                  */
 957                 role = p->role_val_to_struct[c->role - 1];
 958                 if (!ebitmap_get_bit(&role->types, c->type - 1))
 959                         /* role may not be associated with type */
 960                         return 0;
 961
 962                 /*
 963                  * User must be authorized for the role.
 964                  */
 965                 usrdatum = p->user_val_to_struct[c->user - 1];
 966                 if (!usrdatum)
 967                         return 0;
 968
 969                 if (!ebitmap_get_bit(&usrdatum->roles, c->role - 1))
 970                         /* user may not be associated with role */
 971                         return 0;
 972         }
 973
 974         if (!mls_context_isvalid(p, c))
 975                 return 0;
 976
 977         return 1;
 978 }
 979
 980 /*
 981  * Read a MLS range structure from a policydb binary
 982  * representation file.
 983  */
 984 static int mls_read_range_helper(struct mls_range *r, void *fp)
 985 {
 986         __le32 buf[2];
 987         u32 items;
 988         int rc;
 989
 990         rc = next_entry(buf, fp, sizeof(u32));
 991         if (rc)
 992                 goto out;
 993
 994         rc = -EINVAL;
 995         items = le32_to_cpu(buf[0]);
 996         if (items > ARRAY_SIZE(buf)) {
 997                 printk(KERN_ERR "SELinux: mls:  range overflow\n");
 998                 goto out;
 999         }
1000
1001         rc = next_entry(buf, fp, sizeof(u32) * items);
1002         if (rc) {
1003                 printk(KERN_ERR "SELinux: mls:  truncated range\n");
1004                 goto out;
1005         }
1006
1007         r->level[0].sens = le32_to_cpu(buf[0]);
1008         if (items > 1)
1009                 r->level[1].sens = le32_to_cpu(buf[1]);
1010         else
1011                 r->level[1].sens = r->level[0].sens;
1012
1013         rc = ebitmap_read(&r->level[0].cat, fp);
1014         if (rc) {
1015                 printk(KERN_ERR "SELinux: mls:  error reading low categories\n");
1016                 goto out;
1017         }
1018         if (items > 1) {
1019                 rc = ebitmap_read(&r->level[1].cat, fp);
1020                 if (rc) {
1021                         printk(KERN_ERR "SELinux: mls:  error reading high categories\n");
1022                         goto bad_high;
1023                 }
1024         } else {
1025                 rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat);
1026                 if (rc) {
1027                         printk(KERN_ERR "SELinux: mls:  out of memory\n");
1028                         goto bad_high;
1029                 }
1030         }
1031
1032         return 0;
1033 bad_high:
1034         ebitmap_destroy(&r->level[0].cat);
1035 out:
1036         return rc;
1037 }
1038
1039 /*
1040  * Read and validate a security context structure
1041  * from a policydb binary representation file.
1042  */
1043 static int context_read_and_validate(struct context *c,
1044                                      struct policydb *p,
1045                                      void *fp)
1046 {
1047         __le32 buf[3];
1048         int rc;
1049
1050         rc = next_entry(buf, fp, sizeof buf);
1051         if (rc) {
1052                 printk(KERN_ERR "SELinux: context truncated\n");
1053                 goto out;
1054         }
1055         c->user = le32_to_cpu(buf[0]);
1056         c->role = le32_to_cpu(buf[1]);
1057         c->type = le32_to_cpu(buf[2]);
1058         if (p->policyvers >= POLICYDB_VERSION_MLS) {
1059                 rc = mls_read_range_helper(&c->range, fp);
1060                 if (rc) {
1061                         printk(KERN_ERR "SELinux: error reading MLS range of context\n");
1062                         goto out;
1063                 }
1064         }
1065
1066         rc = -EINVAL;
1067         if (!policydb_context_isvalid(p, c)) {
1068                 printk(KERN_ERR "SELinux:  invalid security context\n");
1069                 context_destroy(c);
1070                 goto out;
1071         }
1072         rc = 0;
1073 out:
1074         return rc;
1075 }
1076
1077 /*
1078  * The following *_read functions are used to
1079  * read the symbol data from a policy database
1080  * binary representation file.
1081  */
1082
1083 static int perm_read(struct policydb *p, struct hashtab *h, void *fp)
1084 {
1085         char *key = NULL;
1086         struct perm_datum *perdatum;
1087         int rc;
1088         __le32 buf[2];
1089         u32 len;
1090
1091         rc = -ENOMEM;
1092         perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
1093         if (!perdatum)
1094                 goto bad;
1095
1096         rc = next_entry(buf, fp, sizeof buf);
1097         if (rc)
1098                 goto bad;
1099
1100         len = le32_to_cpu(buf[0]);
1101         perdatum->value = le32_to_cpu(buf[1]);
1102
1103         rc = -ENOMEM;
1104         key = kmalloc(len + 1, GFP_KERNEL);
1105         if (!key)
1106                 goto bad;
1107
1108         rc = next_entry(key, fp, len);
1109         if (rc)
1110                 goto bad;
1111         key[len] = '\0';
1112
1113         rc = hashtab_insert(h, key, perdatum);
1114         if (rc)
1115                 goto bad;
1116
1117         return 0;
1118 bad:
1119         perm_destroy(key, perdatum, NULL);
1120         return rc;
1121 }
1122
1123 static int common_read(struct policydb *p, struct hashtab *h, void *fp)
1124 {
1125         char *key = NULL;
1126         struct common_datum *comdatum;
1127         __le32 buf[4];
1128         u32 len, nel;
1129         int i, rc;
1130
1131         rc = -ENOMEM;
1132         comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
1133         if (!comdatum)
1134                 goto bad;
1135
1136         rc = next_entry(buf, fp, sizeof buf);
1137         if (rc)
1138                 goto bad;
1139
1140         len = le32_to_cpu(buf[0]);
1141         comdatum->value = le32_to_cpu(buf[1]);
1142
1143         rc = symtab_init(&comdatum->permissions, PERM_SYMTAB_SIZE);
1144         if (rc)
1145                 goto bad;
1146         comdatum->permissions.nprim = le32_to_cpu(buf[2]);
1147         nel = le32_to_cpu(buf[3]);
1148
1149         rc = -ENOMEM;
1150         key = kmalloc(len + 1, GFP_KERNEL);
1151         if (!key)
1152                 goto bad;
1153
1154         rc = next_entry(key, fp, len);
1155         if (rc)
1156                 goto bad;
1157         key[len] = '\0';
1158
1159         for (i = 0; i < nel; i++) {
1160                 rc = perm_read(p, comdatum->permissions.table, fp);
1161                 if (rc)
1162                         goto bad;
1163         }
1164
1165         rc = hashtab_insert(h, key, comdatum);
1166         if (rc)
1167                 goto bad;
1168         return 0;
1169 bad:
1170         common_destroy(key, comdatum, NULL);
1171         return rc;
1172 }
1173
1174 static void type_set_init(struct type_set *t)
1175 {
1176         ebitmap_init(&t->types);
1177         ebitmap_init(&t->negset);
1178 }
1179
1180 static int type_set_read(struct type_set *t, void *fp)
1181 {
1182         __le32 buf[1];
1183         int rc;
1184
1185         if (ebitmap_read(&t->types, fp))
1186                 return -EINVAL;
1187         if (ebitmap_read(&t->negset, fp))
1188                 return -EINVAL;
1189
1190         rc = next_entry(buf, fp, sizeof(u32));
1191         if (rc < 0)
1192                 return -EINVAL;
1193         t->flags = le32_to_cpu(buf[0]);
1194
1195         return 0;
1196 }
1197
1198
1199 static int read_cons_helper(struct policydb *p,
1200                                 struct constraint_node **nodep,
1201                                 int ncons, int allowxtarget, void *fp)
1202 {
1203         struct constraint_node *c, *lc;
1204         struct constraint_expr *e, *le;
1205         __le32 buf[3];
1206         u32 nexpr;
1207         int rc, i, j, depth;
1208
1209         lc = NULL;
1210         for (i = 0; i < ncons; i++) {
1211                 c = kzalloc(sizeof(*c), GFP_KERNEL);
1212                 if (!c)
1213                         return -ENOMEM;
1214
1215                 if (lc)
1216                         lc->next = c;
1217                 else
1218                         *nodep = c;
1219
1220                 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1221                 if (rc)
1222                         return rc;
1223                 c->permissions = le32_to_cpu(buf[0]);
1224                 nexpr = le32_to_cpu(buf[1]);
1225                 le = NULL;
1226                 depth = -1;
1227                 for (j = 0; j < nexpr; j++) {
1228                         e = kzalloc(sizeof(*e), GFP_KERNEL);
1229                         if (!e)
1230                                 return -ENOMEM;
1231
1232                         if (le)
1233                                 le->next = e;
1234                         else
1235                                 c->expr = e;
1236
1237                         rc = next_entry(buf, fp, (sizeof(u32) * 3));
1238                         if (rc)
1239                                 return rc;
1240                         e->expr_type = le32_to_cpu(buf[0]);
1241                         e->attr = le32_to_cpu(buf[1]);
1242                         e->op = le32_to_cpu(buf[2]);
1243
1244                         switch (e->expr_type) {
1245                         case CEXPR_NOT:
1246                                 if (depth < 0)
1247                                         return -EINVAL;
1248                                 break;
1249                         case CEXPR_AND:
1250                         case CEXPR_OR:
1251                                 if (depth < 1)
1252                                         return -EINVAL;
1253                                 depth--;
1254                                 break;
1255                         case CEXPR_ATTR:
1256                                 if (depth == (CEXPR_MAXDEPTH - 1))
1257                                         return -EINVAL;
1258                                 depth++;
1259                                 break;
1260                         case CEXPR_NAMES:
1261                                 if (!allowxtarget && (e->attr & CEXPR_XTARGET))
1262                                         return -EINVAL;
1263                                 if (depth == (CEXPR_MAXDEPTH - 1))
1264                                         return -EINVAL;
1265                                 depth++;
1266                                 rc = ebitmap_read(&e->names, fp);
1267                                 if (rc)
1268                                         return rc;
1269                                 if (p->policyvers >=
1270                                         POLICYDB_VERSION_CONSTRAINT_NAMES) {
1271                                                 e->type_names = kzalloc(sizeof
1272                                                 (*e->type_names),
1273                                                 GFP_KERNEL);
1274                                         if (!e->type_names)
1275                                                 return -ENOMEM;
1276                                         type_set_init(e->type_names);
1277                                         rc = type_set_read(e->type_names, fp);
1278                                         if (rc)
1279                                                 return rc;
1280                                 }
1281                                 break;
1282                         default:
1283                                 return -EINVAL;
1284                         }
1285                         le = e;
1286                 }
1287                 if (depth != 0)
1288                         return -EINVAL;
1289                 lc = c;
1290         }
1291
1292         return 0;
1293 }
1294
1295 static int class_read(struct policydb *p, struct hashtab *h, void *fp)
1296 {
1297         char *key = NULL;
1298         struct class_datum *cladatum;
1299         __le32 buf[6];
1300         u32 len, len2, ncons, nel;
1301         int i, rc;
1302
1303         rc = -ENOMEM;
1304         cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
1305         if (!cladatum)
1306                 goto bad;
1307
1308         rc = next_entry(buf, fp, sizeof(u32)*6);
1309         if (rc)
1310                 goto bad;
1311
1312         len = le32_to_cpu(buf[0]);
1313         len2 = le32_to_cpu(buf[1]);
1314         cladatum->value = le32_to_cpu(buf[2]);
1315
1316         rc = symtab_init(&cladatum->permissions, PERM_SYMTAB_SIZE);
1317         if (rc)
1318                 goto bad;
1319         cladatum->permissions.nprim = le32_to_cpu(buf[3]);
1320         nel = le32_to_cpu(buf[4]);
1321
1322         ncons = le32_to_cpu(buf[5]);
1323
1324         rc = -ENOMEM;
1325         key = kmalloc(len + 1, GFP_KERNEL);
1326         if (!key)
1327                 goto bad;
1328
1329         rc = next_entry(key, fp, len);
1330         if (rc)
1331                 goto bad;
1332         key[len] = '\0';
1333
1334         if (len2) {
1335                 rc = -ENOMEM;
1336                 cladatum->comkey = kmalloc(len2 + 1, GFP_KERNEL);
1337                 if (!cladatum->comkey)
1338                         goto bad;
1339                 rc = next_entry(cladatum->comkey, fp, len2);
1340                 if (rc)
1341                         goto bad;
1342                 cladatum->comkey[len2] = '\0';
1343
1344                 rc = -EINVAL;
1345                 cladatum->comdatum = hashtab_search(p->p_commons.table, cladatum->comkey);
1346                 if (!cladatum->comdatum) {
1347                         printk(KERN_ERR "SELinux:  unknown common %s\n", cladatum->comkey);
1348                         goto bad;
1349                 }
1350         }
1351         for (i = 0; i < nel; i++) {
1352                 rc = perm_read(p, cladatum->permissions.table, fp);
1353                 if (rc)
1354                         goto bad;
1355         }
1356
1357         rc = read_cons_helper(p, &cladatum->constraints, ncons, 0, fp);
1358         if (rc)
1359                 goto bad;
1360
1361         if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
1362                 /* grab the validatetrans rules */
1363                 rc = next_entry(buf, fp, sizeof(u32));
1364                 if (rc)
1365                         goto bad;
1366                 ncons = le32_to_cpu(buf[0]);
1367                 rc = read_cons_helper(p, &cladatum->validatetrans,
1368                                 ncons, 1, fp);
1369                 if (rc)
1370                         goto bad;
1371         }
1372
1373         if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
1374                 rc = next_entry(buf, fp, sizeof(u32) * 3);
1375                 if (rc)
1376                         goto bad;
1377
1378                 cladatum->default_user = le32_to_cpu(buf[0]);
1379                 cladatum->default_role = le32_to_cpu(buf[1]);
1380                 cladatum->default_range = le32_to_cpu(buf[2]);
1381         }
1382
1383         if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
1384                 rc = next_entry(buf, fp, sizeof(u32) * 1);
1385                 if (rc)
1386                         goto bad;
1387                 cladatum->default_type = le32_to_cpu(buf[0]);
1388         }
1389
1390         rc = hashtab_insert(h, key, cladatum);
1391         if (rc)
1392                 goto bad;
1393
1394         return 0;
1395 bad:
1396         cls_destroy(key, cladatum, NULL);
1397         return rc;
1398 }
1399
1400 static int role_read(struct policydb *p, struct hashtab *h, void *fp)
1401 {
1402         char *key = NULL;
1403         struct role_datum *role;
1404         int rc, to_read = 2;
1405         __le32 buf[3];
1406         u32 len;
1407
1408         rc = -ENOMEM;
1409         role = kzalloc(sizeof(*role), GFP_KERNEL);
1410         if (!role)
1411                 goto bad;
1412
1413         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1414                 to_read = 3;
1415
1416         rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1417         if (rc)
1418                 goto bad;
1419
1420         len = le32_to_cpu(buf[0]);
1421         role->value = le32_to_cpu(buf[1]);
1422         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1423                 role->bounds = le32_to_cpu(buf[2]);
1424
1425         rc = -ENOMEM;
1426         key = kmalloc(len + 1, GFP_KERNEL);
1427         if (!key)
1428                 goto bad;
1429
1430         rc = next_entry(key, fp, len);
1431         if (rc)
1432                 goto bad;
1433         key[len] = '\0';
1434
1435         rc = ebitmap_read(&role->dominates, fp);
1436         if (rc)
1437                 goto bad;
1438
1439         rc = ebitmap_read(&role->types, fp);
1440         if (rc)
1441                 goto bad;
1442
1443         if (strcmp(key, OBJECT_R) == 0) {
1444                 rc = -EINVAL;
1445                 if (role->value != OBJECT_R_VAL) {
1446                         printk(KERN_ERR "SELinux: Role %s has wrong value %d\n",
1447                                OBJECT_R, role->value);
1448                         goto bad;
1449                 }
1450                 rc = 0;
1451                 goto bad;
1452         }
1453
1454         rc = hashtab_insert(h, key, role);
1455         if (rc)
1456                 goto bad;
1457         return 0;
1458 bad:
1459         role_destroy(key, role, NULL);
1460         return rc;
1461 }
1462
1463 static int type_read(struct policydb *p, struct hashtab *h, void *fp)
1464 {
1465         char *key = NULL;
1466         struct type_datum *typdatum;
1467         int rc, to_read = 3;
1468         __le32 buf[4];
1469         u32 len;
1470
1471         rc = -ENOMEM;
1472         typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL);
1473         if (!typdatum)
1474                 goto bad;
1475
1476         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1477                 to_read = 4;
1478
1479         rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1480         if (rc)
1481                 goto bad;
1482
1483         len = le32_to_cpu(buf[0]);
1484         typdatum->value = le32_to_cpu(buf[1]);
1485         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
1486                 u32 prop = le32_to_cpu(buf[2]);
1487
1488                 if (prop & TYPEDATUM_PROPERTY_PRIMARY)
1489                         typdatum->primary = 1;
1490                 if (prop & TYPEDATUM_PROPERTY_ATTRIBUTE)
1491                         typdatum->attribute = 1;
1492
1493                 typdatum->bounds = le32_to_cpu(buf[3]);
1494         } else {
1495                 typdatum->primary = le32_to_cpu(buf[2]);
1496         }
1497
1498         rc = -ENOMEM;
1499         key = kmalloc(len + 1, GFP_KERNEL);
1500         if (!key)
1501                 goto bad;
1502         rc = next_entry(key, fp, len);
1503         if (rc)
1504                 goto bad;
1505         key[len] = '\0';
1506
1507         rc = hashtab_insert(h, key, typdatum);
1508         if (rc)
1509                 goto bad;
1510         return 0;
1511 bad:
1512         type_destroy(key, typdatum, NULL);
1513         return rc;
1514 }
1515
1516
1517 /*
1518  * Read a MLS level structure from a policydb binary
1519  * representation file.
1520  */
1521 static int mls_read_level(struct mls_level *lp, void *fp)
1522 {
1523         __le32 buf[1];
1524         int rc;
1525
1526         memset(lp, 0, sizeof(*lp));
1527
1528         rc = next_entry(buf, fp, sizeof buf);
1529         if (rc) {
1530                 printk(KERN_ERR "SELinux: mls: truncated level\n");
1531                 return rc;
1532         }
1533         lp->sens = le32_to_cpu(buf[0]);
1534
1535         rc = ebitmap_read(&lp->cat, fp);
1536         if (rc) {
1537                 printk(KERN_ERR "SELinux: mls:  error reading level categories\n");
1538                 return rc;
1539         }
1540         return 0;
1541 }
1542
1543 static int user_read(struct policydb *p, struct hashtab *h, void *fp)
1544 {
1545         char *key = NULL;
1546         struct user_datum *usrdatum;
1547         int rc, to_read = 2;
1548         __le32 buf[3];
1549         u32 len;
1550
1551         rc = -ENOMEM;
1552         usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
1553         if (!usrdatum)
1554                 goto bad;
1555
1556         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1557                 to_read = 3;
1558
1559         rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1560         if (rc)
1561                 goto bad;
1562
1563         len = le32_to_cpu(buf[0]);
1564         usrdatum->value = le32_to_cpu(buf[1]);
1565         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1566                 usrdatum->bounds = le32_to_cpu(buf[2]);
1567
1568         rc = -ENOMEM;
1569         key = kmalloc(len + 1, GFP_KERNEL);
1570         if (!key)
1571                 goto bad;
1572         rc = next_entry(key, fp, len);
1573         if (rc)
1574                 goto bad;
1575         key[len] = '\0';
1576
1577         rc = ebitmap_read(&usrdatum->roles, fp);
1578         if (rc)
1579                 goto bad;
1580
1581         if (p->policyvers >= POLICYDB_VERSION_MLS) {
1582                 rc = mls_read_range_helper(&usrdatum->range, fp);
1583                 if (rc)
1584                         goto bad;
1585                 rc = mls_read_level(&usrdatum->dfltlevel, fp);
1586                 if (rc)
1587                         goto bad;
1588         }
1589
1590         rc = hashtab_insert(h, key, usrdatum);
1591         if (rc)
1592                 goto bad;
1593         return 0;
1594 bad:
1595         user_destroy(key, usrdatum, NULL);
1596         return rc;
1597 }
1598
1599 static int sens_read(struct policydb *p, struct hashtab *h, void *fp)
1600 {
1601         char *key = NULL;
1602         struct level_datum *levdatum;
1603         int rc;
1604         __le32 buf[2];
1605         u32 len;
1606
1607         rc = -ENOMEM;
1608         levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC);
1609         if (!levdatum)
1610                 goto bad;
1611
1612         rc = next_entry(buf, fp, sizeof buf);
1613         if (rc)
1614                 goto bad;
1615
1616         len = le32_to_cpu(buf[0]);
1617         levdatum->isalias = le32_to_cpu(buf[1]);
1618
1619         rc = -ENOMEM;
1620         key = kmalloc(len + 1, GFP_ATOMIC);
1621         if (!key)
1622                 goto bad;
1623         rc = next_entry(key, fp, len);
1624         if (rc)
1625                 goto bad;
1626         key[len] = '\0';
1627
1628         rc = -ENOMEM;
1629         levdatum->level = kmalloc(sizeof(struct mls_level), GFP_ATOMIC);
1630         if (!levdatum->level)
1631                 goto bad;
1632
1633         rc = mls_read_level(levdatum->level, fp);
1634         if (rc)
1635                 goto bad;
1636
1637         rc = hashtab_insert(h, key, levdatum);
1638         if (rc)
1639                 goto bad;
1640         return 0;
1641 bad:
1642         sens_destroy(key, levdatum, NULL);
1643         return rc;
1644 }
1645
1646 static int cat_read(struct policydb *p, struct hashtab *h, void *fp)
1647 {
1648         char *key = NULL;
1649         struct cat_datum *catdatum;
1650         int rc;
1651         __le32 buf[3];
1652         u32 len;
1653
1654         rc = -ENOMEM;
1655         catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC);
1656         if (!catdatum)
1657                 goto bad;
1658
1659         rc = next_entry(buf, fp, sizeof buf);
1660         if (rc)
1661                 goto bad;
1662
1663         len = le32_to_cpu(buf[0]);
1664         catdatum->value = le32_to_cpu(buf[1]);
1665         catdatum->isalias = le32_to_cpu(buf[2]);
1666
1667         rc = -ENOMEM;
1668         key = kmalloc(len + 1, GFP_ATOMIC);
1669         if (!key)
1670                 goto bad;
1671         rc = next_entry(key, fp, len);
1672         if (rc)
1673                 goto bad;
1674         key[len] = '\0';
1675
1676         rc = hashtab_insert(h, key, catdatum);
1677         if (rc)
1678                 goto bad;
1679         return 0;
1680 bad:
1681         cat_destroy(key, catdatum, NULL);
1682         return rc;
1683 }
1684
1685 static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, void *fp) =
1686 {
1687         common_read,
1688         class_read,
1689         role_read,
1690         type_read,
1691         user_read,
1692         cond_read_bool,
1693         sens_read,
1694         cat_read,
1695 };
1696
1697 static int user_bounds_sanity_check(void *key, void *datum, void *datap)
1698 {
1699         struct user_datum *upper, *user;
1700         struct policydb *p = datap;
1701         int depth = 0;
1702
1703         upper = user = datum;
1704         while (upper->bounds) {
1705                 struct ebitmap_node *node;
1706                 unsigned long bit;
1707
1708                 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1709                         printk(KERN_ERR "SELinux: user %s: "
1710                                "too deep or looped boundary",
1711                                (char *) key);
1712                         return -EINVAL;
1713                 }
1714
1715                 upper = p->user_val_to_struct[upper->bounds - 1];
1716                 ebitmap_for_each_positive_bit(&user->roles, node, bit) {
1717                         if (ebitmap_get_bit(&upper->roles, bit))
1718                                 continue;
1719
1720                         printk(KERN_ERR
1721                                "SELinux: boundary violated policy: "
1722                                "user=%s role=%s bounds=%s\n",
1723                                sym_name(p, SYM_USERS, user->value - 1),
1724                                sym_name(p, SYM_ROLES, bit),
1725                                sym_name(p, SYM_USERS, upper->value - 1));
1726
1727                         return -EINVAL;
1728                 }
1729         }
1730
1731         return 0;
1732 }
1733
1734 static int role_bounds_sanity_check(void *key, void *datum, void *datap)
1735 {
1736         struct role_datum *upper, *role;
1737         struct policydb *p = datap;
1738         int depth = 0;
1739
1740         upper = role = datum;
1741         while (upper->bounds) {
1742                 struct ebitmap_node *node;
1743                 unsigned long bit;
1744
1745                 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1746                         printk(KERN_ERR "SELinux: role %s: "
1747                                "too deep or looped bounds\n",
1748                                (char *) key);
1749                         return -EINVAL;
1750                 }
1751
1752                 upper = p->role_val_to_struct[upper->bounds - 1];
1753                 ebitmap_for_each_positive_bit(&role->types, node, bit) {
1754                         if (ebitmap_get_bit(&upper->types, bit))
1755                                 continue;
1756
1757                         printk(KERN_ERR
1758                                "SELinux: boundary violated policy: "
1759                                "role=%s type=%s bounds=%s\n",
1760                                sym_name(p, SYM_ROLES, role->value - 1),
1761                                sym_name(p, SYM_TYPES, bit),
1762                                sym_name(p, SYM_ROLES, upper->value - 1));
1763
1764                         return -EINVAL;
1765                 }
1766         }
1767
1768         return 0;
1769 }
1770
1771 static int type_bounds_sanity_check(void *key, void *datum, void *datap)
1772 {
1773         struct type_datum *upper;
1774         struct policydb *p = datap;
1775         int depth = 0;
1776
1777         upper = datum;
1778         while (upper->bounds) {
1779                 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1780                         printk(KERN_ERR "SELinux: type %s: "
1781                                "too deep or looped boundary\n",
1782                                (char *) key);
1783                         return -EINVAL;
1784                 }
1785
1786                 upper = flex_array_get_ptr(p->type_val_to_struct_array,
1787                                            upper->bounds - 1);
1788                 BUG_ON(!upper);
1789
1790                 if (upper->attribute) {
1791                         printk(KERN_ERR "SELinux: type %s: "
1792                                "bounded by attribute %s",
1793                                (char *) key,
1794                                sym_name(p, SYM_TYPES, upper->value - 1));
1795                         return -EINVAL;
1796                 }
1797         }
1798
1799         return 0;
1800 }
1801
1802 static int policydb_bounds_sanity_check(struct policydb *p)
1803 {
1804         int rc;
1805
1806         if (p->policyvers < POLICYDB_VERSION_BOUNDARY)
1807                 return 0;
1808
1809         rc = hashtab_map(p->p_users.table,
1810                          user_bounds_sanity_check, p);
1811         if (rc)
1812                 return rc;
1813
1814         rc = hashtab_map(p->p_roles.table,
1815                          role_bounds_sanity_check, p);
1816         if (rc)
1817                 return rc;
1818
1819         rc = hashtab_map(p->p_types.table,
1820                          type_bounds_sanity_check, p);
1821         if (rc)
1822                 return rc;
1823
1824         return 0;
1825 }
1826
1827 u16 string_to_security_class(struct policydb *p, const char *name)
1828 {
1829         struct class_datum *cladatum;
1830
1831         cladatum = hashtab_search(p->p_classes.table, name);
1832         if (!cladatum)
1833                 return 0;
1834
1835         return cladatum->value;
1836 }
1837
1838 u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name)
1839 {
1840         struct class_datum *cladatum;
1841         struct perm_datum *perdatum = NULL;
1842         struct common_datum *comdatum;
1843
1844         if (!tclass || tclass > p->p_classes.nprim)
1845                 return 0;
1846
1847         cladatum = p->class_val_to_struct[tclass-1];
1848         comdatum = cladatum->comdatum;
1849         if (comdatum)
1850                 perdatum = hashtab_search(comdatum->permissions.table,
1851                                           name);
1852         if (!perdatum)
1853                 perdatum = hashtab_search(cladatum->permissions.table,
1854                                           name);
1855         if (!perdatum)
1856                 return 0;
1857
1858         return 1U << (perdatum->value-1);
1859 }
1860
1861 static int range_read(struct policydb *p, void *fp)
1862 {
1863         struct range_trans *rt = NULL;
1864         struct mls_range *r = NULL;
1865         int i, rc;
1866         __le32 buf[2];
1867         u32 nel;
1868
1869         if (p->policyvers < POLICYDB_VERSION_MLS)
1870                 return 0;
1871
1872         rc = next_entry(buf, fp, sizeof(u32));
1873         if (rc)
1874                 goto out;
1875
1876         nel = le32_to_cpu(buf[0]);
1877         for (i = 0; i < nel; i++) {
1878                 rc = -ENOMEM;
1879                 rt = kzalloc(sizeof(*rt), GFP_KERNEL);
1880                 if (!rt)
1881                         goto out;
1882
1883                 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1884                 if (rc)
1885                         goto out;
1886
1887                 rt->source_type = le32_to_cpu(buf[0]);
1888                 rt->target_type = le32_to_cpu(buf[1]);
1889                 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
1890                         rc = next_entry(buf, fp, sizeof(u32));
1891                         if (rc)
1892                                 goto out;
1893                         rt->target_class = le32_to_cpu(buf[0]);
1894                 } else
1895                         rt->target_class = p->process_class;
1896
1897                 rc = -EINVAL;
1898                 if (!policydb_type_isvalid(p, rt->source_type) ||
1899                     !policydb_type_isvalid(p, rt->target_type) ||
1900                     !policydb_class_isvalid(p, rt->target_class))
1901                         goto out;
1902
1903                 rc = -ENOMEM;
1904                 r = kzalloc(sizeof(*r), GFP_KERNEL);
1905                 if (!r)
1906                         goto out;
1907
1908                 rc = mls_read_range_helper(r, fp);
1909                 if (rc)
1910                         goto out;
1911
1912                 rc = -EINVAL;
1913                 if (!mls_range_isvalid(p, r)) {
1914                         printk(KERN_WARNING "SELinux:  rangetrans:  invalid range\n");
1915                         goto out;
1916                 }
1917
1918                 rc = hashtab_insert(p->range_tr, rt, r);
1919                 if (rc)
1920                         goto out;
1921
1922                 rt = NULL;
1923                 r = NULL;
1924         }
1925         hash_eval(p->range_tr, "rangetr");
1926         rc = 0;
1927 out:
1928         kfree(rt);
1929         kfree(r);
1930         return rc;
1931 }
1932
1933 static int filename_trans_read(struct policydb *p, void *fp)
1934 {
1935         struct filename_trans *ft;
1936         struct filename_trans_datum *otype;
1937         char *name;
1938         u32 nel, len;
1939         __le32 buf[4];
1940         int rc, i;
1941
1942         if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
1943                 return 0;
1944
1945         rc = next_entry(buf, fp, sizeof(u32));
1946         if (rc)
1947                 return rc;
1948         nel = le32_to_cpu(buf[0]);
1949
1950         for (i = 0; i < nel; i++) {
1951                 ft = NULL;
1952                 otype = NULL;
1953                 name = NULL;
1954
1955                 rc = -ENOMEM;
1956                 ft = kzalloc(sizeof(*ft), GFP_KERNEL);
1957                 if (!ft)
1958                         goto out;
1959
1960                 rc = -ENOMEM;
1961                 otype = kmalloc(sizeof(*otype), GFP_KERNEL);
1962                 if (!otype)
1963                         goto out;
1964
1965                 /* length of the path component string */
1966                 rc = next_entry(buf, fp, sizeof(u32));
1967                 if (rc)
1968                         goto out;
1969                 len = le32_to_cpu(buf[0]);
1970
1971                 rc = -ENOMEM;
1972                 name = kmalloc(len + 1, GFP_KERNEL);
1973                 if (!name)
1974                         goto out;
1975
1976                 ft->name = name;
1977
1978                 /* path component string */
1979                 rc = next_entry(name, fp, len);
1980                 if (rc)
1981                         goto out;
1982                 name[len] = 0;
1983
1984                 rc = next_entry(buf, fp, sizeof(u32) * 4);
1985                 if (rc)
1986                         goto out;
1987
1988                 ft->stype = le32_to_cpu(buf[0]);
1989                 ft->ttype = le32_to_cpu(buf[1]);
1990                 ft->tclass = le32_to_cpu(buf[2]);
1991
1992                 otype->otype = le32_to_cpu(buf[3]);
1993
1994                 rc = ebitmap_set_bit(&p->filename_trans_ttypes, ft->ttype, 1);
1995                 if (rc)
1996                         goto out;
1997
1998                 rc = hashtab_insert(p->filename_trans, ft, otype);
1999                 if (rc) {
2000                         /*
2001                          * Do not return -EEXIST to the caller, or the system
2002                          * will not boot.
2003                          */
2004                         if (rc != -EEXIST)
2005                                 goto out;
2006                         /* But free memory to avoid memory leak. */
2007                         kfree(ft);
2008                         kfree(name);
2009                         kfree(otype);
2010                 }
2011         }
2012         hash_eval(p->filename_trans, "filenametr");
2013         return 0;
2014 out:
2015         kfree(ft);
2016         kfree(name);
2017         kfree(otype);
2018
2019         return rc;
2020 }
2021
2022 static int genfs_read(struct policydb *p, void *fp)
2023 {
2024         int i, j, rc;
2025         u32 nel, nel2, len, len2;
2026         __le32 buf[1];
2027         struct ocontext *l, *c;
2028         struct ocontext *newc = NULL;
2029         struct genfs *genfs_p, *genfs;
2030         struct genfs *newgenfs = NULL;
2031
2032         rc = next_entry(buf, fp, sizeof(u32));
2033         if (rc)
2034                 goto out;
2035         nel = le32_to_cpu(buf[0]);
2036
2037         for (i = 0; i < nel; i++) {
2038                 rc = next_entry(buf, fp, sizeof(u32));
2039                 if (rc)
2040                         goto out;
2041                 len = le32_to_cpu(buf[0]);
2042
2043                 rc = -ENOMEM;
2044                 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
2045                 if (!newgenfs)
2046                         goto out;
2047
2048                 rc = -ENOMEM;
2049                 newgenfs->fstype = kmalloc(len + 1, GFP_KERNEL);
2050                 if (!newgenfs->fstype)
2051                         goto out;
2052
2053                 rc = next_entry(newgenfs->fstype, fp, len);
2054                 if (rc)
2055                         goto out;
2056
2057                 newgenfs->fstype[len] = 0;
2058
2059                 for (genfs_p = NULL, genfs = p->genfs; genfs;
2060                      genfs_p = genfs, genfs = genfs->next) {
2061                         rc = -EINVAL;
2062                         if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
2063                                 printk(KERN_ERR "SELinux:  dup genfs fstype %s\n",
2064                                        newgenfs->fstype);
2065                                 goto out;
2066                         }
2067                         if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
2068                                 break;
2069                 }
2070                 newgenfs->next = genfs;
2071                 if (genfs_p)
2072                         genfs_p->next = newgenfs;
2073                 else
2074                         p->genfs = newgenfs;
2075                 genfs = newgenfs;
2076                 newgenfs = NULL;
2077
2078                 rc = next_entry(buf, fp, sizeof(u32));
2079                 if (rc)
2080                         goto out;
2081
2082                 nel2 = le32_to_cpu(buf[0]);
2083                 for (j = 0; j < nel2; j++) {
2084                         rc = next_entry(buf, fp, sizeof(u32));
2085                         if (rc)
2086                                 goto out;
2087                         len = le32_to_cpu(buf[0]);
2088
2089                         rc = -ENOMEM;
2090                         newc = kzalloc(sizeof(*newc), GFP_KERNEL);
2091                         if (!newc)
2092                                 goto out;
2093
2094                         rc = -ENOMEM;
2095                         newc->u.name = kmalloc(len + 1, GFP_KERNEL);
2096                         if (!newc->u.name)
2097                                 goto out;
2098
2099                         rc = next_entry(newc->u.name, fp, len);
2100                         if (rc)
2101                                 goto out;
2102                         newc->u.name[len] = 0;
2103
2104                         rc = next_entry(buf, fp, sizeof(u32));
2105                         if (rc)
2106                                 goto out;
2107
2108                         newc->v.sclass = le32_to_cpu(buf[0]);
2109                         rc = context_read_and_validate(&newc->context[0], p, fp);
2110                         if (rc)
2111                                 goto out;
2112
2113                         for (l = NULL, c = genfs->head; c;
2114                              l = c, c = c->next) {
2115                                 rc = -EINVAL;
2116                                 if (!strcmp(newc->u.name, c->u.name) &&
2117                                     (!c->v.sclass || !newc->v.sclass ||
2118                                      newc->v.sclass == c->v.sclass)) {
2119                                         printk(KERN_ERR "SELinux:  dup genfs entry (%s,%s)\n",
2120                                                genfs->fstype, c->u.name);
2121                                         goto out;
2122                                 }
2123                                 len = strlen(newc->u.name);
2124                                 len2 = strlen(c->u.name);
2125                                 if (len > len2)
2126                                         break;
2127                         }
2128
2129                         newc->next = c;
2130                         if (l)
2131                                 l->next = newc;
2132                         else
2133                                 genfs->head = newc;
2134                         newc = NULL;
2135                 }
2136         }
2137         rc = 0;
2138 out:
2139         if (newgenfs)
2140                 kfree(newgenfs->fstype);
2141         kfree(newgenfs);
2142         ocontext_destroy(newc, OCON_FSUSE);
2143
2144         return rc;
2145 }
2146
2147 static int ocontext_read(struct policydb *p, struct policydb_compat_info *info,
2148                          void *fp)
2149 {
2150         int i, j, rc;
2151         u32 nel, len;
2152         __le32 buf[3];
2153         struct ocontext *l, *c;
2154         u32 nodebuf[8];
2155
2156         for (i = 0; i < info->ocon_num; i++) {
2157                 rc = next_entry(buf, fp, sizeof(u32));
2158                 if (rc)
2159                         goto out;
2160                 nel = le32_to_cpu(buf[0]);
2161
2162                 l = NULL;
2163                 for (j = 0; j < nel; j++) {
2164                         rc = -ENOMEM;
2165                         c = kzalloc(sizeof(*c), GFP_KERNEL);
2166                         if (!c)
2167                                 goto out;
2168                         if (l)
2169                                 l->next = c;
2170                         else
2171                                 p->ocontexts[i] = c;
2172                         l = c;
2173
2174                         switch (i) {
2175                         case OCON_ISID:
2176                                 rc = next_entry(buf, fp, sizeof(u32));
2177                                 if (rc)
2178                                         goto out;
2179
2180                                 c->sid[0] = le32_to_cpu(buf[0]);
2181                                 rc = context_read_and_validate(&c->context[0], p, fp);
2182                                 if (rc)
2183                                         goto out;
2184                                 break;
2185                         case OCON_FS:
2186                         case OCON_NETIF:
2187                                 rc = next_entry(buf, fp, sizeof(u32));
2188                                 if (rc)
2189                                         goto out;
2190                                 len = le32_to_cpu(buf[0]);
2191
2192                                 rc = -ENOMEM;
2193                                 c->u.name = kmalloc(len + 1, GFP_KERNEL);
2194                                 if (!c->u.name)
2195                                         goto out;
2196
2197                                 rc = next_entry(c->u.name, fp, len);
2198                                 if (rc)
2199                                         goto out;
2200
2201                                 c->u.name[len] = 0;
2202                                 rc = context_read_and_validate(&c->context[0], p, fp);
2203                                 if (rc)
2204                                         goto out;
2205                                 rc = context_read_and_validate(&c->context[1], p, fp);
2206                                 if (rc)
2207                                         goto out;
2208                                 break;
2209                         case OCON_PORT:
2210                                 rc = next_entry(buf, fp, sizeof(u32)*3);
2211                                 if (rc)
2212                                         goto out;
2213                                 c->u.port.protocol = le32_to_cpu(buf[0]);
2214                                 c->u.port.low_port = le32_to_cpu(buf[1]);
2215                                 c->u.port.high_port = le32_to_cpu(buf[2]);
2216                                 rc = context_read_and_validate(&c->context[0], p, fp);
2217                                 if (rc)
2218                                         goto out;
2219                                 break;
2220                         case OCON_NODE:
2221                                 rc = next_entry(nodebuf, fp, sizeof(u32) * 2);
2222                                 if (rc)
2223                                         goto out;
2224                                 c->u.node.addr = nodebuf[0]; /* network order */
2225                                 c->u.node.mask = nodebuf[1]; /* network order */
2226                                 rc = context_read_and_validate(&c->context[0], p, fp);
2227                                 if (rc)
2228                                         goto out;
2229                                 break;
2230                         case OCON_FSUSE:
2231                                 rc = next_entry(buf, fp, sizeof(u32)*2);
2232                                 if (rc)
2233                                         goto out;
2234
2235                                 rc = -EINVAL;
2236                                 c->v.behavior = le32_to_cpu(buf[0]);
2237                                 /* Determined at runtime, not in policy DB. */
2238                                 if (c->v.behavior == SECURITY_FS_USE_MNTPOINT)
2239                                         goto out;
2240                                 if (c->v.behavior > SECURITY_FS_USE_MAX)
2241                                         goto out;
2242
2243                                 rc = -ENOMEM;
2244                                 len = le32_to_cpu(buf[1]);
2245                                 c->u.name = kmalloc(len + 1, GFP_KERNEL);
2246                                 if (!c->u.name)
2247                                         goto out;
2248
2249                                 rc = next_entry(c->u.name, fp, len);
2250                                 if (rc)
2251                                         goto out;
2252                                 c->u.name[len] = 0;
2253                                 rc = context_read_and_validate(&c->context[0], p, fp);
2254                                 if (rc)
2255                                         goto out;
2256                                 break;
2257                         case OCON_NODE6: {
2258                                 int k;
2259
2260                                 rc = next_entry(nodebuf, fp, sizeof(u32) * 8);
2261                                 if (rc)
2262                                         goto out;
2263                                 for (k = 0; k < 4; k++)
2264                                         c->u.node6.addr[k] = nodebuf[k];
2265                                 for (k = 0; k < 4; k++)
2266                                         c->u.node6.mask[k] = nodebuf[k+4];
2267                                 rc = context_read_and_validate(&c->context[0], p, fp);
2268                                 if (rc)
2269                                         goto out;
2270                                 break;
2271                         }
2272                         }
2273                 }
2274         }
2275         rc = 0;
2276 out:
2277         return rc;
2278 }
2279
2280 /*
2281  * Read the configuration data from a policy database binary
2282  * representation file into a policy database structure.
2283  */
2284 int policydb_read(struct policydb *p, void *fp)
2285 {
2286         struct role_allow *ra, *lra;
2287         struct role_trans *tr, *ltr;
2288         int i, j, rc;
2289         __le32 buf[4];
2290         u32 len, nprim, nel;
2291
2292         char *policydb_str;
2293         struct policydb_compat_info *info;
2294
2295         rc = policydb_init(p);
2296         if (rc)
2297                 return rc;
2298
2299         /* Read the magic number and string length. */
2300         rc = next_entry(buf, fp, sizeof(u32) * 2);
2301         if (rc)
2302                 goto bad;
2303
2304         rc = -EINVAL;
2305         if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
2306                 printk(KERN_ERR "SELinux:  policydb magic number 0x%x does "
2307                        "not match expected magic number 0x%x\n",
2308                        le32_to_cpu(buf[0]), POLICYDB_MAGIC);
2309                 goto bad;
2310         }
2311
2312         rc = -EINVAL;
2313         len = le32_to_cpu(buf[1]);
2314         if (len != strlen(POLICYDB_STRING)) {
2315                 printk(KERN_ERR "SELinux:  policydb string length %d does not "
2316                        "match expected length %Zu\n",
2317                        len, strlen(POLICYDB_STRING));
2318                 goto bad;
2319         }
2320
2321         rc = -ENOMEM;
2322         policydb_str = kmalloc(len + 1, GFP_KERNEL);
2323         if (!policydb_str) {
2324                 printk(KERN_ERR "SELinux:  unable to allocate memory for policydb "
2325                        "string of length %d\n", len);
2326                 goto bad;
2327         }
2328
2329         rc = next_entry(policydb_str, fp, len);
2330         if (rc) {
2331                 printk(KERN_ERR "SELinux:  truncated policydb string identifier\n");
2332                 kfree(policydb_str);
2333                 goto bad;
2334         }
2335
2336         rc = -EINVAL;
2337         policydb_str[len] = '\0';
2338         if (strcmp(policydb_str, POLICYDB_STRING)) {
2339                 printk(KERN_ERR "SELinux:  policydb string %s does not match "
2340                        "my string %s\n", policydb_str, POLICYDB_STRING);
2341                 kfree(policydb_str);
2342                 goto bad;
2343         }
2344         /* Done with policydb_str. */
2345         kfree(policydb_str);
2346         policydb_str = NULL;
2347
2348         /* Read the version and table sizes. */
2349         rc = next_entry(buf, fp, sizeof(u32)*4);
2350         if (rc)
2351                 goto bad;
2352
2353         rc = -EINVAL;
2354         p->policyvers = le32_to_cpu(buf[0]);
2355         if (p->policyvers < POLICYDB_VERSION_MIN ||
2356             p->policyvers > POLICYDB_VERSION_MAX) {
2357                 printk(KERN_ERR "SELinux:  policydb version %d does not match "
2358                        "my version range %d-%d\n",
2359                        le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
2360                 goto bad;
2361         }
2362
2363         if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
2364                 p->mls_enabled = 1;
2365
2366                 rc = -EINVAL;
2367                 if (p->policyvers < POLICYDB_VERSION_MLS) {
2368                         printk(KERN_ERR "SELinux: security policydb version %d "
2369                                 "(MLS) not backwards compatible\n",
2370                                 p->policyvers);
2371                         goto bad;
2372                 }
2373         }
2374         p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
2375         p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
2376
2377         if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
2378                 rc = ebitmap_read(&p->policycaps, fp);
2379                 if (rc)
2380                         goto bad;
2381         }
2382
2383         if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
2384                 rc = ebitmap_read(&p->permissive_map, fp);
2385                 if (rc)
2386                         goto bad;
2387         }
2388
2389         rc = -EINVAL;
2390         info = policydb_lookup_compat(p->policyvers);
2391         if (!info) {
2392                 printk(KERN_ERR "SELinux:  unable to find policy compat info "
2393                        "for version %d\n", p->policyvers);
2394                 goto bad;
2395         }
2396
2397         rc = -EINVAL;
2398         if (le32_to_cpu(buf[2]) != info->sym_num ||
2399                 le32_to_cpu(buf[3]) != info->ocon_num) {
2400                 printk(KERN_ERR "SELinux:  policydb table sizes (%d,%d) do "
2401                        "not match mine (%d,%d)\n", le32_to_cpu(buf[2]),
2402                         le32_to_cpu(buf[3]),
2403                        info->sym_num, info->ocon_num);
2404                 goto bad;
2405         }
2406
2407         for (i = 0; i < info->sym_num; i++) {
2408                 rc = next_entry(buf, fp, sizeof(u32)*2);
2409                 if (rc)
2410                         goto bad;
2411                 nprim = le32_to_cpu(buf[0]);
2412                 nel = le32_to_cpu(buf[1]);
2413                 for (j = 0; j < nel; j++) {
2414                         rc = read_f[i](p, p->symtab[i].table, fp);
2415                         if (rc)
2416                                 goto bad;
2417                 }
2418
2419                 p->symtab[i].nprim = nprim;
2420         }
2421
2422         rc = -EINVAL;
2423         p->process_class = string_to_security_class(p, "process");
2424         if (!p->process_class)
2425                 goto bad;
2426
2427         rc = avtab_read(&p->te_avtab, fp, p);
2428         if (rc)
2429                 goto bad;
2430
2431         if (p->policyvers >= POLICYDB_VERSION_BOOL) {
2432                 rc = cond_read_list(p, fp);
2433                 if (rc)
2434                         goto bad;
2435         }
2436
2437         rc = next_entry(buf, fp, sizeof(u32));
2438         if (rc)
2439                 goto bad;
2440         nel = le32_to_cpu(buf[0]);
2441         ltr = NULL;
2442         for (i = 0; i < nel; i++) {
2443                 rc = -ENOMEM;
2444                 tr = kzalloc(sizeof(*tr), GFP_KERNEL);
2445                 if (!tr)
2446                         goto bad;
2447                 if (ltr)
2448                         ltr->next = tr;
2449                 else
2450                         p->role_tr = tr;
2451                 rc = next_entry(buf, fp, sizeof(u32)*3);
2452                 if (rc)
2453                         goto bad;
2454
2455                 rc = -EINVAL;
2456                 tr->role = le32_to_cpu(buf[0]);
2457                 tr->type = le32_to_cpu(buf[1]);
2458                 tr->new_role = le32_to_cpu(buf[2]);
2459                 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2460                         rc = next_entry(buf, fp, sizeof(u32));
2461                         if (rc)
2462                                 goto bad;
2463                         tr->tclass = le32_to_cpu(buf[0]);
2464                 } else
2465                         tr->tclass = p->process_class;
2466
2467                 if (!policydb_role_isvalid(p, tr->role) ||
2468                     !policydb_type_isvalid(p, tr->type) ||
2469                     !policydb_class_isvalid(p, tr->tclass) ||
2470                     !policydb_role_isvalid(p, tr->new_role))
2471                         goto bad;
2472                 ltr = tr;
2473         }
2474
2475         rc = next_entry(buf, fp, sizeof(u32));
2476         if (rc)
2477                 goto bad;
2478         nel = le32_to_cpu(buf[0]);
2479         lra = NULL;
2480         for (i = 0; i < nel; i++) {
2481                 rc = -ENOMEM;
2482                 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
2483                 if (!ra)
2484                         goto bad;
2485                 if (lra)
2486                         lra->next = ra;
2487                 else
2488                         p->role_allow = ra;
2489                 rc = next_entry(buf, fp, sizeof(u32)*2);
2490                 if (rc)
2491                         goto bad;
2492
2493                 rc = -EINVAL;
2494                 ra->role = le32_to_cpu(buf[0]);
2495                 ra->new_role = le32_to_cpu(buf[1]);
2496                 if (!policydb_role_isvalid(p, ra->role) ||
2497                     !policydb_role_isvalid(p, ra->new_role))
2498                         goto bad;
2499                 lra = ra;
2500         }
2501
2502         rc = filename_trans_read(p, fp);
2503         if (rc)
2504                 goto bad;
2505
2506         rc = policydb_index(p);
2507         if (rc)
2508                 goto bad;
2509
2510         rc = -EINVAL;
2511         p->process_trans_perms = string_to_av_perm(p, p->process_class, "transition");
2512         p->process_trans_perms |= string_to_av_perm(p, p->process_class, "dyntransition");
2513         if (!p->process_trans_perms)
2514                 goto bad;
2515
2516         rc = ocontext_read(p, info, fp);
2517         if (rc)
2518                 goto bad;
2519
2520         rc = genfs_read(p, fp);
2521         if (rc)
2522                 goto bad;
2523
2524         rc = range_read(p, fp);
2525         if (rc)
2526                 goto bad;
2527
2528         rc = -ENOMEM;
2529         p->type_attr_map_array = flex_array_alloc(sizeof(struct ebitmap),
2530                                                   p->p_types.nprim,
2531                                                   GFP_KERNEL | __GFP_ZERO);
2532         if (!p->type_attr_map_array)
2533                 goto bad;
2534
2535         /* preallocate so we don't have to worry about the put ever failing */
2536         rc = flex_array_prealloc(p->type_attr_map_array, 0, p->p_types.nprim,
2537                                  GFP_KERNEL | __GFP_ZERO);
2538         if (rc)
2539                 goto bad;
2540
2541         for (i = 0; i < p->p_types.nprim; i++) {
2542                 struct ebitmap *e = flex_array_get(p->type_attr_map_array, i);
2543
2544                 BUG_ON(!e);
2545                 ebitmap_init(e);
2546                 if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
2547                         rc = ebitmap_read(e, fp);
2548                         if (rc)
2549                                 goto bad;
2550                 }
2551                 /* add the type itself as the degenerate case */
2552                 rc = ebitmap_set_bit(e, i, 1);
2553                 if (rc)
2554                         goto bad;
2555         }
2556
2557         rc = policydb_bounds_sanity_check(p);
2558         if (rc)
2559                 goto bad;
2560
2561         rc = 0;
2562 out:
2563         return rc;
2564 bad:
2565         policydb_destroy(p);
2566         goto out;
2567 }
2568
2569 /*
2570  * Write a MLS level structure to a policydb binary
2571  * representation file.
2572  */
2573 static int mls_write_level(struct mls_level *l, void *fp)
2574 {
2575         __le32 buf[1];
2576         int rc;
2577
2578         buf[0] = cpu_to_le32(l->sens);
2579         rc = put_entry(buf, sizeof(u32), 1, fp);
2580         if (rc)
2581                 return rc;
2582
2583         rc = ebitmap_write(&l->cat, fp);
2584         if (rc)
2585                 return rc;
2586
2587         return 0;
2588 }
2589
2590 /*
2591  * Write a MLS range structure to a policydb binary
2592  * representation file.
2593  */
2594 static int mls_write_range_helper(struct mls_range *r, void *fp)
2595 {
2596         __le32 buf[3];
2597         size_t items;
2598         int rc, eq;
2599
2600         eq = mls_level_eq(&r->level[1], &r->level[0]);
2601
2602         if (eq)
2603                 items = 2;
2604         else
2605                 items = 3;
2606         buf[0] = cpu_to_le32(items-1);
2607         buf[1] = cpu_to_le32(r->level[0].sens);
2608         if (!eq)
2609                 buf[2] = cpu_to_le32(r->level[1].sens);
2610
2611         BUG_ON(items > (sizeof(buf)/sizeof(buf[0])));
2612
2613         rc = put_entry(buf, sizeof(u32), items, fp);
2614         if (rc)
2615                 return rc;
2616
2617         rc = ebitmap_write(&r->level[0].cat, fp);
2618         if (rc)
2619                 return rc;
2620         if (!eq) {
2621                 rc = ebitmap_write(&r->level[1].cat, fp);
2622                 if (rc)
2623                         return rc;
2624         }
2625
2626         return 0;
2627 }
2628
2629 static int sens_write(void *vkey, void *datum, void *ptr)
2630 {
2631         char *key = vkey;
2632         struct level_datum *levdatum = datum;
2633         struct policy_data *pd = ptr;
2634         void *fp = pd->fp;
2635         __le32 buf[2];
2636         size_t len;
2637         int rc;
2638
2639         len = strlen(key);
2640         buf[0] = cpu_to_le32(len);
2641         buf[1] = cpu_to_le32(levdatum->isalias);
2642         rc = put_entry(buf, sizeof(u32), 2, fp);
2643         if (rc)
2644                 return rc;
2645
2646         rc = put_entry(key, 1, len, fp);
2647         if (rc)
2648                 return rc;
2649
2650         rc = mls_write_level(levdatum->level, fp);
2651         if (rc)
2652                 return rc;
2653
2654         return 0;
2655 }
2656
2657 static int cat_write(void *vkey, void *datum, void *ptr)
2658 {
2659         char *key = vkey;
2660         struct cat_datum *catdatum = datum;
2661         struct policy_data *pd = ptr;
2662         void *fp = pd->fp;
2663         __le32 buf[3];
2664         size_t len;
2665         int rc;
2666
2667         len = strlen(key);
2668         buf[0] = cpu_to_le32(len);
2669         buf[1] = cpu_to_le32(catdatum->value);
2670         buf[2] = cpu_to_le32(catdatum->isalias);
2671         rc = put_entry(buf, sizeof(u32), 3, fp);
2672         if (rc)
2673                 return rc;
2674
2675         rc = put_entry(key, 1, len, fp);
2676         if (rc)
2677                 return rc;
2678
2679         return 0;
2680 }
2681
2682 static int role_trans_write(struct policydb *p, void *fp)
2683 {
2684         struct role_trans *r = p->role_tr;
2685         struct role_trans *tr;
2686         u32 buf[3];
2687         size_t nel;
2688         int rc;
2689
2690         nel = 0;
2691         for (tr = r; tr; tr = tr->next)
2692                 nel++;
2693         buf[0] = cpu_to_le32(nel);
2694         rc = put_entry(buf, sizeof(u32), 1, fp);
2695         if (rc)
2696                 return rc;
2697         for (tr = r; tr; tr = tr->next) {
2698                 buf[0] = cpu_to_le32(tr->role);
2699                 buf[1] = cpu_to_le32(tr->type);
2700                 buf[2] = cpu_to_le32(tr->new_role);
2701                 rc = put_entry(buf, sizeof(u32), 3, fp);
2702                 if (rc)
2703                         return rc;
2704                 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2705                         buf[0] = cpu_to_le32(tr->tclass);
2706                         rc = put_entry(buf, sizeof(u32), 1, fp);
2707                         if (rc)
2708                                 return rc;
2709                 }
2710         }
2711
2712         return 0;
2713 }
2714
2715 static int role_allow_write(struct role_allow *r, void *fp)
2716 {
2717         struct role_allow *ra;
2718         u32 buf[2];
2719         size_t nel;
2720         int rc;
2721
2722         nel = 0;
2723         for (ra = r; ra; ra = ra->next)
2724                 nel++;
2725         buf[0] = cpu_to_le32(nel);
2726         rc = put_entry(buf, sizeof(u32), 1, fp);
2727         if (rc)
2728                 return rc;
2729         for (ra = r; ra; ra = ra->next) {
2730                 buf[0] = cpu_to_le32(ra->role);
2731                 buf[1] = cpu_to_le32(ra->new_role);
2732                 rc = put_entry(buf, sizeof(u32), 2, fp);
2733                 if (rc)
2734                         return rc;
2735         }
2736         return 0;
2737 }
2738
2739 /*
2740  * Write a security context structure
2741  * to a policydb binary representation file.
2742  */
2743 static int context_write(struct policydb *p, struct context *c,
2744                          void *fp)
2745 {
2746         int rc;
2747         __le32 buf[3];
2748
2749         buf[0] = cpu_to_le32(c->user);
2750         buf[1] = cpu_to_le32(c->role);
2751         buf[2] = cpu_to_le32(c->type);
2752
2753         rc = put_entry(buf, sizeof(u32), 3, fp);
2754         if (rc)
2755                 return rc;
2756
2757         rc = mls_write_range_helper(&c->range, fp);
2758         if (rc)
2759                 return rc;
2760
2761         return 0;
2762 }
2763
2764 /*
2765  * The following *_write functions are used to
2766  * write the symbol data to a policy database
2767  * binary representation file.
2768  */
2769
2770 static int perm_write(void *vkey, void *datum, void *fp)
2771 {
2772         char *key = vkey;
2773         struct perm_datum *perdatum = datum;
2774         __le32 buf[2];
2775         size_t len;
2776         int rc;
2777
2778         len = strlen(key);
2779         buf[0] = cpu_to_le32(len);
2780         buf[1] = cpu_to_le32(perdatum->value);
2781         rc = put_entry(buf, sizeof(u32), 2, fp);
2782         if (rc)
2783                 return rc;
2784
2785         rc = put_entry(key, 1, len, fp);
2786         if (rc)
2787                 return rc;
2788
2789         return 0;
2790 }
2791
2792 static int common_write(void *vkey, void *datum, void *ptr)
2793 {
2794         char *key = vkey;
2795         struct common_datum *comdatum = datum;
2796         struct policy_data *pd = ptr;
2797         void *fp = pd->fp;
2798         __le32 buf[4];
2799         size_t len;
2800         int rc;
2801
2802         len = strlen(key);
2803         buf[0] = cpu_to_le32(len);
2804         buf[1] = cpu_to_le32(comdatum->value);
2805         buf[2] = cpu_to_le32(comdatum->permissions.nprim);
2806         buf[3] = cpu_to_le32(comdatum->permissions.table->nel);
2807         rc = put_entry(buf, sizeof(u32), 4, fp);
2808         if (rc)
2809                 return rc;
2810
2811         rc = put_entry(key, 1, len, fp);
2812         if (rc)
2813                 return rc;
2814
2815         rc = hashtab_map(comdatum->permissions.table, perm_write, fp);
2816         if (rc)
2817                 return rc;
2818
2819         return 0;
2820 }
2821
2822 static int type_set_write(struct type_set *t, void *fp)
2823 {
2824         int rc;
2825         __le32 buf[1];
2826
2827         if (ebitmap_write(&t->types, fp))
2828                 return -EINVAL;
2829         if (ebitmap_write(&t->negset, fp))
2830                 return -EINVAL;
2831
2832         buf[0] = cpu_to_le32(t->flags);
2833         rc = put_entry(buf, sizeof(u32), 1, fp);
2834         if (rc)
2835                 return -EINVAL;
2836
2837         return 0;
2838 }
2839
2840 static int write_cons_helper(struct policydb *p, struct constraint_node *node,
2841                              void *fp)
2842 {
2843         struct constraint_node *c;
2844         struct constraint_expr *e;
2845         __le32 buf[3];
2846         u32 nel;
2847         int rc;
2848
2849         for (c = node; c; c = c->next) {
2850                 nel = 0;
2851                 for (e = c->expr; e; e = e->next)
2852                         nel++;
2853                 buf[0] = cpu_to_le32(c->permissions);
2854                 buf[1] = cpu_to_le32(nel);
2855                 rc = put_entry(buf, sizeof(u32), 2, fp);
2856                 if (rc)
2857                         return rc;
2858                 for (e = c->expr; e; e = e->next) {
2859                         buf[0] = cpu_to_le32(e->expr_type);
2860                         buf[1] = cpu_to_le32(e->attr);
2861                         buf[2] = cpu_to_le32(e->op);
2862                         rc = put_entry(buf, sizeof(u32), 3, fp);
2863                         if (rc)
2864                                 return rc;
2865
2866                         switch (e->expr_type) {
2867                         case CEXPR_NAMES:
2868                                 rc = ebitmap_write(&e->names, fp);
2869                                 if (rc)
2870                                         return rc;
2871                                 if (p->policyvers >=
2872                                         POLICYDB_VERSION_CONSTRAINT_NAMES) {
2873                                         rc = type_set_write(e->type_names, fp);
2874                                         if (rc)
2875                                                 return rc;
2876                                 }
2877                                 break;
2878                         default:
2879                                 break;
2880                         }
2881                 }
2882         }
2883
2884         return 0;
2885 }
2886
2887 static int class_write(void *vkey, void *datum, void *ptr)
2888 {
2889         char *key = vkey;
2890         struct class_datum *cladatum = datum;
2891         struct policy_data *pd = ptr;
2892         void *fp = pd->fp;
2893         struct policydb *p = pd->p;
2894         struct constraint_node *c;
2895         __le32 buf[6];
2896         u32 ncons;
2897         size_t len, len2;
2898         int rc;
2899
2900         len = strlen(key);
2901         if (cladatum->comkey)
2902                 len2 = strlen(cladatum->comkey);
2903         else
2904                 len2 = 0;
2905
2906         ncons = 0;
2907         for (c = cladatum->constraints; c; c = c->next)
2908                 ncons++;
2909
2910         buf[0] = cpu_to_le32(len);
2911         buf[1] = cpu_to_le32(len2);
2912         buf[2] = cpu_to_le32(cladatum->value);
2913         buf[3] = cpu_to_le32(cladatum->permissions.nprim);
2914         if (cladatum->permissions.table)
2915                 buf[4] = cpu_to_le32(cladatum->permissions.table->nel);
2916         else
2917                 buf[4] = 0;
2918         buf[5] = cpu_to_le32(ncons);
2919         rc = put_entry(buf, sizeof(u32), 6, fp);
2920         if (rc)
2921                 return rc;
2922
2923         rc = put_entry(key, 1, len, fp);
2924         if (rc)
2925                 return rc;
2926
2927         if (cladatum->comkey) {
2928                 rc = put_entry(cladatum->comkey, 1, len2, fp);
2929                 if (rc)
2930                         return rc;
2931         }
2932
2933         rc = hashtab_map(cladatum->permissions.table, perm_write, fp);
2934         if (rc)
2935                 return rc;
2936
2937         rc = write_cons_helper(p, cladatum->constraints, fp);
2938         if (rc)
2939                 return rc;
2940
2941         /* write out the validatetrans rule */
2942         ncons = 0;
2943         for (c = cladatum->validatetrans; c; c = c->next)
2944                 ncons++;
2945
2946         buf[0] = cpu_to_le32(ncons);
2947         rc = put_entry(buf, sizeof(u32), 1, fp);
2948         if (rc)
2949                 return rc;
2950
2951         rc = write_cons_helper(p, cladatum->validatetrans, fp);
2952         if (rc)
2953                 return rc;
2954
2955         if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
2956                 buf[0] = cpu_to_le32(cladatum->default_user);
2957                 buf[1] = cpu_to_le32(cladatum->default_role);
2958                 buf[2] = cpu_to_le32(cladatum->default_range);
2959
2960                 rc = put_entry(buf, sizeof(uint32_t), 3, fp);
2961                 if (rc)
2962                         return rc;
2963         }
2964
2965         if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
2966                 buf[0] = cpu_to_le32(cladatum->default_type);
2967                 rc = put_entry(buf, sizeof(uint32_t), 1, fp);
2968                 if (rc)
2969                         return rc;
2970         }
2971
2972         return 0;
2973 }
2974
2975 static int role_write(void *vkey, void *datum, void *ptr)
2976 {
2977         char *key = vkey;
2978         struct role_datum *role = datum;
2979         struct policy_data *pd = ptr;
2980         void *fp = pd->fp;
2981         struct policydb *p = pd->p;
2982         __le32 buf[3];
2983         size_t items, len;
2984         int rc;
2985
2986         len = strlen(key);
2987         items = 0;
2988         buf[items++] = cpu_to_le32(len);
2989         buf[items++] = cpu_to_le32(role->value);
2990         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
2991                 buf[items++] = cpu_to_le32(role->bounds);
2992
2993         BUG_ON(items > (sizeof(buf)/sizeof(buf[0])));
2994
2995         rc = put_entry(buf, sizeof(u32), items, fp);
2996         if (rc)
2997                 return rc;
2998
2999         rc = put_entry(key, 1, len, fp);
3000         if (rc)
3001                 return rc;
3002
3003         rc = ebitmap_write(&role->dominates, fp);
3004         if (rc)
3005                 return rc;
3006
3007         rc = ebitmap_write(&role->types, fp);
3008         if (rc)
3009                 return rc;
3010
3011         return 0;
3012 }
3013
3014 static int type_write(void *vkey, void *datum, void *ptr)
3015 {
3016         char *key = vkey;
3017         struct type_datum *typdatum = datum;
3018         struct policy_data *pd = ptr;
3019         struct policydb *p = pd->p;
3020         void *fp = pd->fp;
3021         __le32 buf[4];
3022         int rc;
3023         size_t items, len;
3024
3025         len = strlen(key);
3026         items = 0;
3027         buf[items++] = cpu_to_le32(len);
3028         buf[items++] = cpu_to_le32(typdatum->value);
3029         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
3030                 u32 properties = 0;
3031
3032                 if (typdatum->primary)
3033                         properties |= TYPEDATUM_PROPERTY_PRIMARY;
3034
3035                 if (typdatum->attribute)
3036                         properties |= TYPEDATUM_PROPERTY_ATTRIBUTE;
3037
3038                 buf[items++] = cpu_to_le32(properties);
3039                 buf[items++] = cpu_to_le32(typdatum->bounds);
3040         } else {
3041                 buf[items++] = cpu_to_le32(typdatum->primary);
3042         }
3043         BUG_ON(items > (sizeof(buf) / sizeof(buf[0])));
3044         rc = put_entry(buf, sizeof(u32), items, fp);
3045         if (rc)
3046                 return rc;
3047
3048         rc = put_entry(key, 1, len, fp);
3049         if (rc)
3050                 return rc;
3051
3052         return 0;
3053 }
3054
3055 static int user_write(void *vkey, void *datum, void *ptr)
3056 {
3057         char *key = vkey;
3058         struct user_datum *usrdatum = datum;
3059         struct policy_data *pd = ptr;
3060         struct policydb *p = pd->p;
3061         void *fp = pd->fp;
3062         __le32 buf[3];
3063         size_t items, len;
3064         int rc;
3065
3066         len = strlen(key);
3067         items = 0;
3068         buf[items++] = cpu_to_le32(len);
3069         buf[items++] = cpu_to_le32(usrdatum->value);
3070         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
3071                 buf[items++] = cpu_to_le32(usrdatum->bounds);
3072         BUG_ON(items > (sizeof(buf) / sizeof(buf[0])));
3073         rc = put_entry(buf, sizeof(u32), items, fp);
3074         if (rc)
3075                 return rc;
3076
3077         rc = put_entry(key, 1, len, fp);
3078         if (rc)
3079                 return rc;
3080
3081         rc = ebitmap_write(&usrdatum->roles, fp);
3082         if (rc)
3083                 return rc;
3084
3085         rc = mls_write_range_helper(&usrdatum->range, fp);
3086         if (rc)
3087                 return rc;
3088
3089         rc = mls_write_level(&usrdatum->dfltlevel, fp);
3090         if (rc)
3091                 return rc;
3092
3093         return 0;
3094 }
3095
3096 static int (*write_f[SYM_NUM]) (void *key, void *datum,
3097                                 void *datap) =
3098 {
3099         common_write,
3100         class_write,
3101         role_write,
3102         type_write,
3103         user_write,
3104         cond_write_bool,
3105         sens_write,
3106         cat_write,
3107 };
3108
3109 static int ocontext_write(struct policydb *p, struct policydb_compat_info *info,
3110                           void *fp)
3111 {
3112         unsigned int i, j, rc;
3113         size_t nel, len;
3114         __le32 buf[3];
3115         u32 nodebuf[8];
3116         struct ocontext *c;
3117         for (i = 0; i < info->ocon_num; i++) {
3118                 nel = 0;
3119                 for (c = p->ocontexts[i]; c; c = c->next)
3120                         nel++;
3121                 buf[0] = cpu_to_le32(nel);
3122                 rc = put_entry(buf, sizeof(u32), 1, fp);
3123                 if (rc)
3124                         return rc;
3125                 for (c = p->ocontexts[i]; c; c = c->next) {
3126                         switch (i) {
3127                         case OCON_ISID:
3128                                 buf[0] = cpu_to_le32(c->sid[0]);
3129                                 rc = put_entry(buf, sizeof(u32), 1, fp);
3130                                 if (rc)
3131                                         return rc;
3132                                 rc = context_write(p, &c->context[0], fp);
3133                                 if (rc)
3134                                         return rc;
3135                                 break;
3136                         case OCON_FS:
3137                         case OCON_NETIF:
3138                                 len = strlen(c->u.name);
3139                                 buf[0] = cpu_to_le32(len);
3140                                 rc = put_entry(buf, sizeof(u32), 1, fp);
3141                                 if (rc)
3142                                         return rc;
3143                                 rc = put_entry(c->u.name, 1, len, fp);
3144                                 if (rc)
3145                                         return rc;
3146                                 rc = context_write(p, &c->context[0], fp);
3147                                 if (rc)
3148                                         return rc;
3149                                 rc = context_write(p, &c->context[1], fp);
3150                                 if (rc)
3151                                         return rc;
3152                                 break;
3153                         case OCON_PORT:
3154                                 buf[0] = cpu_to_le32(c->u.port.protocol);
3155                                 buf[1] = cpu_to_le32(c->u.port.low_port);
3156                                 buf[2] = cpu_to_le32(c->u.port.high_port);
3157                                 rc = put_entry(buf, sizeof(u32), 3, fp);
3158                                 if (rc)
3159                                         return rc;
3160                                 rc = context_write(p, &c->context[0], fp);
3161                                 if (rc)
3162                                         return rc;
3163                                 break;
3164                         case OCON_NODE:
3165                                 nodebuf[0] = c->u.node.addr; /* network order */
3166                                 nodebuf[1] = c->u.node.mask; /* network order */
3167                                 rc = put_entry(nodebuf, sizeof(u32), 2, fp);
3168                                 if (rc)
3169                                         return rc;
3170                                 rc = context_write(p, &c->context[0], fp);
3171                                 if (rc)
3172                                         return rc;
3173                                 break;
3174                         case OCON_FSUSE:
3175                                 buf[0] = cpu_to_le32(c->v.behavior);
3176                                 len = strlen(c->u.name);
3177                                 buf[1] = cpu_to_le32(len);
3178                                 rc = put_entry(buf, sizeof(u32), 2, fp);
3179                                 if (rc)
3180                                         return rc;
3181                                 rc = put_entry(c->u.name, 1, len, fp);
3182                                 if (rc)
3183                                         return rc;
3184                                 rc = context_write(p, &c->context[0], fp);
3185                                 if (rc)
3186                                         return rc;
3187                                 break;
3188                         case OCON_NODE6:
3189                                 for (j = 0; j < 4; j++)
3190                                         nodebuf[j] = c->u.node6.addr[j]; /* network order */
3191                                 for (j = 0; j < 4; j++)
3192                                         nodebuf[j + 4] = c->u.node6.mask[j]; /* network order */
3193                                 rc = put_entry(nodebuf, sizeof(u32), 8, fp);
3194                                 if (rc)
3195                                         return rc;
3196                                 rc = context_write(p, &c->context[0], fp);
3197                                 if (rc)
3198                                         return rc;
3199                                 break;
3200                         }
3201                 }
3202         }
3203         return 0;
3204 }
3205
3206 static int genfs_write(struct policydb *p, void *fp)
3207 {
3208         struct genfs *genfs;
3209         struct ocontext *c;
3210         size_t len;
3211         __le32 buf[1];
3212         int rc;
3213
3214         len = 0;
3215         for (genfs = p->genfs; genfs; genfs = genfs->next)
3216                 len++;
3217         buf[0] = cpu_to_le32(len);
3218         rc = put_entry(buf, sizeof(u32), 1, fp);
3219         if (rc)
3220                 return rc;
3221         for (genfs = p->genfs; genfs; genfs = genfs->next) {
3222                 len = strlen(genfs->fstype);
3223                 buf[0] = cpu_to_le32(len);
3224                 rc = put_entry(buf, sizeof(u32), 1, fp);
3225                 if (rc)
3226                         return rc;
3227                 rc = put_entry(genfs->fstype, 1, len, fp);
3228                 if (rc)
3229                         return rc;
3230                 len = 0;
3231                 for (c = genfs->head; c; c = c->next)
3232                         len++;
3233                 buf[0] = cpu_to_le32(len);
3234                 rc = put_entry(buf, sizeof(u32), 1, fp);
3235                 if (rc)
3236                         return rc;
3237                 for (c = genfs->head; c; c = c->next) {
3238                         len = strlen(c->u.name);
3239                         buf[0] = cpu_to_le32(len);
3240                         rc = put_entry(buf, sizeof(u32), 1, fp);
3241                         if (rc)
3242                                 return rc;
3243                         rc = put_entry(c->u.name, 1, len, fp);
3244                         if (rc)
3245                                 return rc;
3246                         buf[0] = cpu_to_le32(c->v.sclass);
3247                         rc = put_entry(buf, sizeof(u32), 1, fp);
3248                         if (rc)
3249                                 return rc;
3250                         rc = context_write(p, &c->context[0], fp);
3251                         if (rc)
3252                                 return rc;
3253                 }
3254         }
3255         return 0;
3256 }
3257
3258 static int hashtab_cnt(void *key, void *data, void *ptr)
3259 {
3260         int *cnt = ptr;
3261         *cnt = *cnt + 1;
3262
3263         return 0;
3264 }
3265
3266 static int range_write_helper(void *key, void *data, void *ptr)
3267 {
3268         __le32 buf[2];
3269         struct range_trans *rt = key;
3270         struct mls_range *r = data;
3271         struct policy_data *pd = ptr;
3272         void *fp = pd->fp;
3273         struct policydb *p = pd->p;
3274         int rc;
3275
3276         buf[0] = cpu_to_le32(rt->source_type);
3277         buf[1] = cpu_to_le32(rt->target_type);
3278         rc = put_entry(buf, sizeof(u32), 2, fp);
3279         if (rc)
3280                 return rc;
3281         if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
3282                 buf[0] = cpu_to_le32(rt->target_class);
3283                 rc = put_entry(buf, sizeof(u32), 1, fp);
3284                 if (rc)
3285                         return rc;
3286         }
3287         rc = mls_write_range_helper(r, fp);
3288         if (rc)
3289                 return rc;
3290
3291         return 0;
3292 }
3293
3294 static int range_write(struct policydb *p, void *fp)
3295 {
3296         __le32 buf[1];
3297         int rc, nel;
3298         struct policy_data pd;
3299
3300         pd.p = p;
3301         pd.fp = fp;
3302
3303         /* count the number of entries in the hashtab */
3304         nel = 0;
3305         rc = hashtab_map(p->range_tr, hashtab_cnt, &nel);
3306         if (rc)
3307                 return rc;
3308
3309         buf[0] = cpu_to_le32(nel);
3310         rc = put_entry(buf, sizeof(u32), 1, fp);
3311         if (rc)
3312                 return rc;
3313
3314         /* actually write all of the entries */
3315         rc = hashtab_map(p->range_tr, range_write_helper, &pd);
3316         if (rc)
3317                 return rc;
3318
3319         return 0;
3320 }
3321
3322 static int filename_write_helper(void *key, void *data, void *ptr)
3323 {
3324         __le32 buf[4];
3325         struct filename_trans *ft = key;
3326         struct filename_trans_datum *otype = data;
3327         void *fp = ptr;
3328         int rc;
3329         u32 len;
3330
3331         len = strlen(ft->name);
3332         buf[0] = cpu_to_le32(len);
3333         rc = put_entry(buf, sizeof(u32), 1, fp);
3334         if (rc)
3335                 return rc;
3336
3337         rc = put_entry(ft->name, sizeof(char), len, fp);
3338         if (rc)
3339                 return rc;
3340
3341         buf[0] = ft->stype;
3342         buf[1] = ft->ttype;
3343         buf[2] = ft->tclass;
3344         buf[3] = otype->otype;
3345
3346         rc = put_entry(buf, sizeof(u32), 4, fp);
3347         if (rc)
3348                 return rc;
3349
3350         return 0;
3351 }
3352
3353 static int filename_trans_write(struct policydb *p, void *fp)
3354 {
3355         u32 nel;
3356         __le32 buf[1];
3357         int rc;
3358
3359         if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
3360                 return 0;
3361
3362         nel = 0;
3363         rc = hashtab_map(p->filename_trans, hashtab_cnt, &nel);
3364         if (rc)
3365                 return rc;
3366
3367         buf[0] = cpu_to_le32(nel);
3368         rc = put_entry(buf, sizeof(u32), 1, fp);
3369         if (rc)
3370                 return rc;
3371
3372         rc = hashtab_map(p->filename_trans, filename_write_helper, fp);
3373         if (rc)
3374                 return rc;
3375
3376         return 0;
3377 }
3378
3379 /*
3380  * Write the configuration data in a policy database
3381  * structure to a policy database binary representation
3382  * file.
3383  */
3384 int policydb_write(struct policydb *p, void *fp)
3385 {
3386         unsigned int i, num_syms;
3387         int rc;
3388         __le32 buf[4];
3389         u32 config;
3390         size_t len;
3391         struct policydb_compat_info *info;
3392
3393         /*
3394          * refuse to write policy older than compressed avtab
3395          * to simplify the writer.  There are other tests dropped
3396          * since we assume this throughout the writer code.  Be
3397          * careful if you ever try to remove this restriction
3398          */
3399         if (p->policyvers < POLICYDB_VERSION_AVTAB) {
3400                 printk(KERN_ERR "SELinux: refusing to write policy version %d."
3401                        "  Because it is less than version %d\n", p->policyvers,
3402                        POLICYDB_VERSION_AVTAB);
3403                 return -EINVAL;
3404         }
3405
3406         config = 0;
3407         if (p->mls_enabled)
3408                 config |= POLICYDB_CONFIG_MLS;
3409
3410         if (p->reject_unknown)
3411                 config |= REJECT_UNKNOWN;
3412         if (p->allow_unknown)
3413                 config |= ALLOW_UNKNOWN;
3414
3415         /* Write the magic number and string identifiers. */
3416         buf[0] = cpu_to_le32(POLICYDB_MAGIC);
3417         len = strlen(POLICYDB_STRING);
3418         buf[1] = cpu_to_le32(len);
3419         rc = put_entry(buf, sizeof(u32), 2, fp);
3420         if (rc)
3421                 return rc;
3422         rc = put_entry(POLICYDB_STRING, 1, len, fp);
3423         if (rc)
3424                 return rc;
3425
3426         /* Write the version, config, and table sizes. */
3427         info = policydb_lookup_compat(p->policyvers);
3428         if (!info) {
3429                 printk(KERN_ERR "SELinux: compatibility lookup failed for policy "
3430                     "version %d", p->policyvers);
3431                 return -EINVAL;
3432         }
3433
3434         buf[0] = cpu_to_le32(p->policyvers);
3435         buf[1] = cpu_to_le32(config);
3436         buf[2] = cpu_to_le32(info->sym_num);
3437         buf[3] = cpu_to_le32(info->ocon_num);
3438
3439         rc = put_entry(buf, sizeof(u32), 4, fp);
3440         if (rc)
3441                 return rc;
3442
3443         if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
3444                 rc = ebitmap_write(&p->policycaps, fp);
3445                 if (rc)
3446                         return rc;
3447         }
3448
3449         if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
3450                 rc = ebitmap_write(&p->permissive_map, fp);
3451                 if (rc)
3452                         return rc;
3453         }
3454
3455         num_syms = info->sym_num;
3456         for (i = 0; i < num_syms; i++) {
3457                 struct policy_data pd;
3458
3459                 pd.fp = fp;
3460                 pd.p = p;
3461
3462                 buf[0] = cpu_to_le32(p->symtab[i].nprim);
3463                 buf[1] = cpu_to_le32(p->symtab[i].table->nel);
3464
3465                 rc = put_entry(buf, sizeof(u32), 2, fp);
3466                 if (rc)
3467                         return rc;
3468                 rc = hashtab_map(p->symtab[i].table, write_f[i], &pd);
3469                 if (rc)
3470                         return rc;
3471         }
3472
3473         rc = avtab_write(p, &p->te_avtab, fp);
3474         if (rc)
3475                 return rc;
3476
3477         rc = cond_write_list(p, p->cond_list, fp);
3478         if (rc)
3479                 return rc;
3480
3481         rc = role_trans_write(p, fp);
3482         if (rc)
3483                 return rc;
3484
3485         rc = role_allow_write(p->role_allow, fp);
3486         if (rc)
3487                 return rc;
3488
3489         rc = filename_trans_write(p, fp);
3490         if (rc)
3491                 return rc;
3492
3493         rc = ocontext_write(p, info, fp);
3494         if (rc)
3495                 return rc;
3496
3497         rc = genfs_write(p, fp);
3498         if (rc)
3499                 return rc;
3500
3501         rc = range_write(p, fp);
3502         if (rc)
3503                 return rc;
3504
3505         for (i = 0; i < p->p_types.nprim; i++) {
3506                 struct ebitmap *e = flex_array_get(p->type_attr_map_array, i);
3507
3508                 BUG_ON(!e);
3509                 rc = ebitmap_write(e, fp);
3510                 if (rc)
3511                         return rc;
3512         }
3513
3514         return 0;
3515 }