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