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                 kmalloc(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                 kmalloc(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                 kmalloc(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 (!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         str = kmalloc(len + 1, flags);
1098         if (!str)
1099                 return -ENOMEM;
1100
1101         /* it's expected the caller should free the str */
1102         *strp = str;
1103
1104         rc = next_entry(str, fp, len);
1105         if (rc)
1106                 return rc;
1107
1108         str[len] = '\0';
1109         return 0;
1110 }
1111
1112 static int perm_read(struct policydb *p, struct hashtab *h, void *fp)
1113 {
1114         char *key = NULL;
1115         struct perm_datum *perdatum;
1116         int rc;
1117         __le32 buf[2];
1118         u32 len;
1119
1120         rc = -ENOMEM;
1121         perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
1122         if (!perdatum)
1123                 goto bad;
1124
1125         rc = next_entry(buf, fp, sizeof buf);
1126         if (rc)
1127                 goto bad;
1128
1129         len = le32_to_cpu(buf[0]);
1130         perdatum->value = le32_to_cpu(buf[1]);
1131
1132         rc = str_read(&key, GFP_KERNEL, fp, len);
1133         if (rc)
1134                 goto bad;
1135
1136         rc = hashtab_insert(h, key, perdatum);
1137         if (rc)
1138                 goto bad;
1139
1140         return 0;
1141 bad:
1142         perm_destroy(key, perdatum, NULL);
1143         return rc;
1144 }
1145
1146 static int common_read(struct policydb *p, struct hashtab *h, void *fp)
1147 {
1148         char *key = NULL;
1149         struct common_datum *comdatum;
1150         __le32 buf[4];
1151         u32 len, nel;
1152         int i, rc;
1153
1154         rc = -ENOMEM;
1155         comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
1156         if (!comdatum)
1157                 goto bad;
1158
1159         rc = next_entry(buf, fp, sizeof buf);
1160         if (rc)
1161                 goto bad;
1162
1163         len = le32_to_cpu(buf[0]);
1164         comdatum->value = le32_to_cpu(buf[1]);
1165
1166         rc = symtab_init(&comdatum->permissions, PERM_SYMTAB_SIZE);
1167         if (rc)
1168                 goto bad;
1169         comdatum->permissions.nprim = le32_to_cpu(buf[2]);
1170         nel = le32_to_cpu(buf[3]);
1171
1172         rc = str_read(&key, GFP_KERNEL, fp, len);
1173         if (rc)
1174                 goto bad;
1175
1176         for (i = 0; i < nel; i++) {
1177                 rc = perm_read(p, comdatum->permissions.table, fp);
1178                 if (rc)
1179                         goto bad;
1180         }
1181
1182         rc = hashtab_insert(h, key, comdatum);
1183         if (rc)
1184                 goto bad;
1185         return 0;
1186 bad:
1187         common_destroy(key, comdatum, NULL);
1188         return rc;
1189 }
1190
1191 static void type_set_init(struct type_set *t)
1192 {
1193         ebitmap_init(&t->types);
1194         ebitmap_init(&t->negset);
1195 }
1196
1197 static int type_set_read(struct type_set *t, void *fp)
1198 {
1199         __le32 buf[1];
1200         int rc;
1201
1202         if (ebitmap_read(&t->types, fp))
1203                 return -EINVAL;
1204         if (ebitmap_read(&t->negset, fp))
1205                 return -EINVAL;
1206
1207         rc = next_entry(buf, fp, sizeof(u32));
1208         if (rc < 0)
1209                 return -EINVAL;
1210         t->flags = le32_to_cpu(buf[0]);
1211
1212         return 0;
1213 }
1214
1215
1216 static int read_cons_helper(struct policydb *p,
1217                                 struct constraint_node **nodep,
1218                                 int ncons, int allowxtarget, void *fp)
1219 {
1220         struct constraint_node *c, *lc;
1221         struct constraint_expr *e, *le;
1222         __le32 buf[3];
1223         u32 nexpr;
1224         int rc, i, j, depth;
1225
1226         lc = NULL;
1227         for (i = 0; i < ncons; i++) {
1228                 c = kzalloc(sizeof(*c), GFP_KERNEL);
1229                 if (!c)
1230                         return -ENOMEM;
1231
1232                 if (lc)
1233                         lc->next = c;
1234                 else
1235                         *nodep = c;
1236
1237                 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1238                 if (rc)
1239                         return rc;
1240                 c->permissions = le32_to_cpu(buf[0]);
1241                 nexpr = le32_to_cpu(buf[1]);
1242                 le = NULL;
1243                 depth = -1;
1244                 for (j = 0; j < nexpr; j++) {
1245                         e = kzalloc(sizeof(*e), GFP_KERNEL);
1246                         if (!e)
1247                                 return -ENOMEM;
1248
1249                         if (le)
1250                                 le->next = e;
1251                         else
1252                                 c->expr = e;
1253
1254                         rc = next_entry(buf, fp, (sizeof(u32) * 3));
1255                         if (rc)
1256                                 return rc;
1257                         e->expr_type = le32_to_cpu(buf[0]);
1258                         e->attr = le32_to_cpu(buf[1]);
1259                         e->op = le32_to_cpu(buf[2]);
1260
1261                         switch (e->expr_type) {
1262                         case CEXPR_NOT:
1263                                 if (depth < 0)
1264                                         return -EINVAL;
1265                                 break;
1266                         case CEXPR_AND:
1267                         case CEXPR_OR:
1268                                 if (depth < 1)
1269                                         return -EINVAL;
1270                                 depth--;
1271                                 break;
1272                         case CEXPR_ATTR:
1273                                 if (depth == (CEXPR_MAXDEPTH - 1))
1274                                         return -EINVAL;
1275                                 depth++;
1276                                 break;
1277                         case CEXPR_NAMES:
1278                                 if (!allowxtarget && (e->attr & CEXPR_XTARGET))
1279                                         return -EINVAL;
1280                                 if (depth == (CEXPR_MAXDEPTH - 1))
1281                                         return -EINVAL;
1282                                 depth++;
1283                                 rc = ebitmap_read(&e->names, fp);
1284                                 if (rc)
1285                                         return rc;
1286                                 if (p->policyvers >=
1287                                         POLICYDB_VERSION_CONSTRAINT_NAMES) {
1288                                                 e->type_names = kzalloc(sizeof
1289                                                 (*e->type_names),
1290                                                 GFP_KERNEL);
1291                                         if (!e->type_names)
1292                                                 return -ENOMEM;
1293                                         type_set_init(e->type_names);
1294                                         rc = type_set_read(e->type_names, fp);
1295                                         if (rc)
1296                                                 return rc;
1297                                 }
1298                                 break;
1299                         default:
1300                                 return -EINVAL;
1301                         }
1302                         le = e;
1303                 }
1304                 if (depth != 0)
1305                         return -EINVAL;
1306                 lc = c;
1307         }
1308
1309         return 0;
1310 }
1311
1312 static int class_read(struct policydb *p, struct hashtab *h, void *fp)
1313 {
1314         char *key = NULL;
1315         struct class_datum *cladatum;
1316         __le32 buf[6];
1317         u32 len, len2, ncons, nel;
1318         int i, rc;
1319
1320         rc = -ENOMEM;
1321         cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
1322         if (!cladatum)
1323                 goto bad;
1324
1325         rc = next_entry(buf, fp, sizeof(u32)*6);
1326         if (rc)
1327                 goto bad;
1328
1329         len = le32_to_cpu(buf[0]);
1330         len2 = le32_to_cpu(buf[1]);
1331         cladatum->value = le32_to_cpu(buf[2]);
1332
1333         rc = symtab_init(&cladatum->permissions, PERM_SYMTAB_SIZE);
1334         if (rc)
1335                 goto bad;
1336         cladatum->permissions.nprim = le32_to_cpu(buf[3]);
1337         nel = le32_to_cpu(buf[4]);
1338
1339         ncons = le32_to_cpu(buf[5]);
1340
1341         rc = str_read(&key, GFP_KERNEL, fp, len);
1342         if (rc)
1343                 goto bad;
1344
1345         if (len2) {
1346                 rc = str_read(&cladatum->comkey, GFP_KERNEL, fp, len2);
1347                 if (rc)
1348                         goto bad;
1349
1350                 rc = -EINVAL;
1351                 cladatum->comdatum = hashtab_search(p->p_commons.table, cladatum->comkey);
1352                 if (!cladatum->comdatum) {
1353                         printk(KERN_ERR "SELinux:  unknown common %s\n", cladatum->comkey);
1354                         goto bad;
1355                 }
1356         }
1357         for (i = 0; i < nel; i++) {
1358                 rc = perm_read(p, cladatum->permissions.table, fp);
1359                 if (rc)
1360                         goto bad;
1361         }
1362
1363         rc = read_cons_helper(p, &cladatum->constraints, ncons, 0, fp);
1364         if (rc)
1365                 goto bad;
1366
1367         if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
1368                 /* grab the validatetrans rules */
1369                 rc = next_entry(buf, fp, sizeof(u32));
1370                 if (rc)
1371                         goto bad;
1372                 ncons = le32_to_cpu(buf[0]);
1373                 rc = read_cons_helper(p, &cladatum->validatetrans,
1374                                 ncons, 1, fp);
1375                 if (rc)
1376                         goto bad;
1377         }
1378
1379         if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
1380                 rc = next_entry(buf, fp, sizeof(u32) * 3);
1381                 if (rc)
1382                         goto bad;
1383
1384                 cladatum->default_user = le32_to_cpu(buf[0]);
1385                 cladatum->default_role = le32_to_cpu(buf[1]);
1386                 cladatum->default_range = le32_to_cpu(buf[2]);
1387         }
1388
1389         if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
1390                 rc = next_entry(buf, fp, sizeof(u32) * 1);
1391                 if (rc)
1392                         goto bad;
1393                 cladatum->default_type = le32_to_cpu(buf[0]);
1394         }
1395
1396         rc = hashtab_insert(h, key, cladatum);
1397         if (rc)
1398                 goto bad;
1399
1400         return 0;
1401 bad:
1402         cls_destroy(key, cladatum, NULL);
1403         return rc;
1404 }
1405
1406 static int role_read(struct policydb *p, struct hashtab *h, void *fp)
1407 {
1408         char *key = NULL;
1409         struct role_datum *role;
1410         int rc, to_read = 2;
1411         __le32 buf[3];
1412         u32 len;
1413
1414         rc = -ENOMEM;
1415         role = kzalloc(sizeof(*role), GFP_KERNEL);
1416         if (!role)
1417                 goto bad;
1418
1419         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1420                 to_read = 3;
1421
1422         rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1423         if (rc)
1424                 goto bad;
1425
1426         len = le32_to_cpu(buf[0]);
1427         role->value = le32_to_cpu(buf[1]);
1428         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1429                 role->bounds = le32_to_cpu(buf[2]);
1430
1431         rc = str_read(&key, GFP_KERNEL, fp, len);
1432         if (rc)
1433                 goto bad;
1434
1435         rc = ebitmap_read(&role->dominates, fp);
1436         if (rc)
1437                 goto bad;
1438
1439         rc = ebitmap_read(&role->types, fp);
1440         if (rc)
1441                 goto bad;
1442
1443         if (strcmp(key, OBJECT_R) == 0) {
1444                 rc = -EINVAL;
1445                 if (role->value != OBJECT_R_VAL) {
1446                         printk(KERN_ERR "SELinux: Role %s has wrong value %d\n",
1447                                OBJECT_R, role->value);
1448                         goto bad;
1449                 }
1450                 rc = 0;
1451                 goto bad;
1452         }
1453
1454         rc = hashtab_insert(h, key, role);
1455         if (rc)
1456                 goto bad;
1457         return 0;
1458 bad:
1459         role_destroy(key, role, NULL);
1460         return rc;
1461 }
1462
1463 static int type_read(struct policydb *p, struct hashtab *h, void *fp)
1464 {
1465         char *key = NULL;
1466         struct type_datum *typdatum;
1467         int rc, to_read = 3;
1468         __le32 buf[4];
1469         u32 len;
1470
1471         rc = -ENOMEM;
1472         typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL);
1473         if (!typdatum)
1474                 goto bad;
1475
1476         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1477                 to_read = 4;
1478
1479         rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1480         if (rc)
1481                 goto bad;
1482
1483         len = le32_to_cpu(buf[0]);
1484         typdatum->value = le32_to_cpu(buf[1]);
1485         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
1486                 u32 prop = le32_to_cpu(buf[2]);
1487
1488                 if (prop & TYPEDATUM_PROPERTY_PRIMARY)
1489                         typdatum->primary = 1;
1490                 if (prop & TYPEDATUM_PROPERTY_ATTRIBUTE)
1491                         typdatum->attribute = 1;
1492
1493                 typdatum->bounds = le32_to_cpu(buf[3]);
1494         } else {
1495                 typdatum->primary = le32_to_cpu(buf[2]);
1496         }
1497
1498         rc = str_read(&key, GFP_KERNEL, fp, len);
1499         if (rc)
1500                 goto bad;
1501
1502         rc = hashtab_insert(h, key, typdatum);
1503         if (rc)
1504                 goto bad;
1505         return 0;
1506 bad:
1507         type_destroy(key, typdatum, NULL);
1508         return rc;
1509 }
1510
1511
1512 /*
1513  * Read a MLS level structure from a policydb binary
1514  * representation file.
1515  */
1516 static int mls_read_level(struct mls_level *lp, void *fp)
1517 {
1518         __le32 buf[1];
1519         int rc;
1520
1521         memset(lp, 0, sizeof(*lp));
1522
1523         rc = next_entry(buf, fp, sizeof buf);
1524         if (rc) {
1525                 printk(KERN_ERR "SELinux: mls: truncated level\n");
1526                 return rc;
1527         }
1528         lp->sens = le32_to_cpu(buf[0]);
1529
1530         rc = ebitmap_read(&lp->cat, fp);
1531         if (rc) {
1532                 printk(KERN_ERR "SELinux: mls:  error reading level categories\n");
1533                 return rc;
1534         }
1535         return 0;
1536 }
1537
1538 static int user_read(struct policydb *p, struct hashtab *h, void *fp)
1539 {
1540         char *key = NULL;
1541         struct user_datum *usrdatum;
1542         int rc, to_read = 2;
1543         __le32 buf[3];
1544         u32 len;
1545
1546         rc = -ENOMEM;
1547         usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
1548         if (!usrdatum)
1549                 goto bad;
1550
1551         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1552                 to_read = 3;
1553
1554         rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1555         if (rc)
1556                 goto bad;
1557
1558         len = le32_to_cpu(buf[0]);
1559         usrdatum->value = le32_to_cpu(buf[1]);
1560         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1561                 usrdatum->bounds = le32_to_cpu(buf[2]);
1562
1563         rc = str_read(&key, GFP_KERNEL, fp, len);
1564         if (rc)
1565                 goto bad;
1566
1567         rc = ebitmap_read(&usrdatum->roles, fp);
1568         if (rc)
1569                 goto bad;
1570
1571         if (p->policyvers >= POLICYDB_VERSION_MLS) {
1572                 rc = mls_read_range_helper(&usrdatum->range, fp);
1573                 if (rc)
1574                         goto bad;
1575                 rc = mls_read_level(&usrdatum->dfltlevel, fp);
1576                 if (rc)
1577                         goto bad;
1578         }
1579
1580         rc = hashtab_insert(h, key, usrdatum);
1581         if (rc)
1582                 goto bad;
1583         return 0;
1584 bad:
1585         user_destroy(key, usrdatum, NULL);
1586         return rc;
1587 }
1588
1589 static int sens_read(struct policydb *p, struct hashtab *h, void *fp)
1590 {
1591         char *key = NULL;
1592         struct level_datum *levdatum;
1593         int rc;
1594         __le32 buf[2];
1595         u32 len;
1596
1597         rc = -ENOMEM;
1598         levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC);
1599         if (!levdatum)
1600                 goto bad;
1601
1602         rc = next_entry(buf, fp, sizeof buf);
1603         if (rc)
1604                 goto bad;
1605
1606         len = le32_to_cpu(buf[0]);
1607         levdatum->isalias = le32_to_cpu(buf[1]);
1608
1609         rc = str_read(&key, GFP_ATOMIC, fp, len);
1610         if (rc)
1611                 goto bad;
1612
1613         rc = -ENOMEM;
1614         levdatum->level = kmalloc(sizeof(struct mls_level), GFP_ATOMIC);
1615         if (!levdatum->level)
1616                 goto bad;
1617
1618         rc = mls_read_level(levdatum->level, fp);
1619         if (rc)
1620                 goto bad;
1621
1622         rc = hashtab_insert(h, key, levdatum);
1623         if (rc)
1624                 goto bad;
1625         return 0;
1626 bad:
1627         sens_destroy(key, levdatum, NULL);
1628         return rc;
1629 }
1630
1631 static int cat_read(struct policydb *p, struct hashtab *h, void *fp)
1632 {
1633         char *key = NULL;
1634         struct cat_datum *catdatum;
1635         int rc;
1636         __le32 buf[3];
1637         u32 len;
1638
1639         rc = -ENOMEM;
1640         catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC);
1641         if (!catdatum)
1642                 goto bad;
1643
1644         rc = next_entry(buf, fp, sizeof buf);
1645         if (rc)
1646                 goto bad;
1647
1648         len = le32_to_cpu(buf[0]);
1649         catdatum->value = le32_to_cpu(buf[1]);
1650         catdatum->isalias = le32_to_cpu(buf[2]);
1651
1652         rc = str_read(&key, GFP_ATOMIC, fp, len);
1653         if (rc)
1654                 goto bad;
1655
1656         rc = hashtab_insert(h, key, catdatum);
1657         if (rc)
1658                 goto bad;
1659         return 0;
1660 bad:
1661         cat_destroy(key, catdatum, NULL);
1662         return rc;
1663 }
1664
1665 static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, void *fp) =
1666 {
1667         common_read,
1668         class_read,
1669         role_read,
1670         type_read,
1671         user_read,
1672         cond_read_bool,
1673         sens_read,
1674         cat_read,
1675 };
1676
1677 static int user_bounds_sanity_check(void *key, void *datum, void *datap)
1678 {
1679         struct user_datum *upper, *user;
1680         struct policydb *p = datap;
1681         int depth = 0;
1682
1683         upper = user = datum;
1684         while (upper->bounds) {
1685                 struct ebitmap_node *node;
1686                 unsigned long bit;
1687
1688                 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1689                         printk(KERN_ERR "SELinux: user %s: "
1690                                "too deep or looped boundary",
1691                                (char *) key);
1692                         return -EINVAL;
1693                 }
1694
1695                 upper = p->user_val_to_struct[upper->bounds - 1];
1696                 ebitmap_for_each_positive_bit(&user->roles, node, bit) {
1697                         if (ebitmap_get_bit(&upper->roles, bit))
1698                                 continue;
1699
1700                         printk(KERN_ERR
1701                                "SELinux: boundary violated policy: "
1702                                "user=%s role=%s bounds=%s\n",
1703                                sym_name(p, SYM_USERS, user->value - 1),
1704                                sym_name(p, SYM_ROLES, bit),
1705                                sym_name(p, SYM_USERS, upper->value - 1));
1706
1707                         return -EINVAL;
1708                 }
1709         }
1710
1711         return 0;
1712 }
1713
1714 static int role_bounds_sanity_check(void *key, void *datum, void *datap)
1715 {
1716         struct role_datum *upper, *role;
1717         struct policydb *p = datap;
1718         int depth = 0;
1719
1720         upper = role = datum;
1721         while (upper->bounds) {
1722                 struct ebitmap_node *node;
1723                 unsigned long bit;
1724
1725                 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1726                         printk(KERN_ERR "SELinux: role %s: "
1727                                "too deep or looped bounds\n",
1728                                (char *) key);
1729                         return -EINVAL;
1730                 }
1731
1732                 upper = p->role_val_to_struct[upper->bounds - 1];
1733                 ebitmap_for_each_positive_bit(&role->types, node, bit) {
1734                         if (ebitmap_get_bit(&upper->types, bit))
1735                                 continue;
1736
1737                         printk(KERN_ERR
1738                                "SELinux: boundary violated policy: "
1739                                "role=%s type=%s bounds=%s\n",
1740                                sym_name(p, SYM_ROLES, role->value - 1),
1741                                sym_name(p, SYM_TYPES, bit),
1742                                sym_name(p, SYM_ROLES, upper->value - 1));
1743
1744                         return -EINVAL;
1745                 }
1746         }
1747
1748         return 0;
1749 }
1750
1751 static int type_bounds_sanity_check(void *key, void *datum, void *datap)
1752 {
1753         struct type_datum *upper;
1754         struct policydb *p = datap;
1755         int depth = 0;
1756
1757         upper = datum;
1758         while (upper->bounds) {
1759                 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1760                         printk(KERN_ERR "SELinux: type %s: "
1761                                "too deep or looped boundary\n",
1762                                (char *) key);
1763                         return -EINVAL;
1764                 }
1765
1766                 upper = flex_array_get_ptr(p->type_val_to_struct_array,
1767                                            upper->bounds - 1);
1768                 BUG_ON(!upper);
1769
1770                 if (upper->attribute) {
1771                         printk(KERN_ERR "SELinux: type %s: "
1772                                "bounded by attribute %s",
1773                                (char *) key,
1774                                sym_name(p, SYM_TYPES, upper->value - 1));
1775                         return -EINVAL;
1776                 }
1777         }
1778
1779         return 0;
1780 }
1781
1782 static int policydb_bounds_sanity_check(struct policydb *p)
1783 {
1784         int rc;
1785
1786         if (p->policyvers < POLICYDB_VERSION_BOUNDARY)
1787                 return 0;
1788
1789         rc = hashtab_map(p->p_users.table,
1790                          user_bounds_sanity_check, p);
1791         if (rc)
1792                 return rc;
1793
1794         rc = hashtab_map(p->p_roles.table,
1795                          role_bounds_sanity_check, p);
1796         if (rc)
1797                 return rc;
1798
1799         rc = hashtab_map(p->p_types.table,
1800                          type_bounds_sanity_check, p);
1801         if (rc)
1802                 return rc;
1803
1804         return 0;
1805 }
1806
1807 u16 string_to_security_class(struct policydb *p, const char *name)
1808 {
1809         struct class_datum *cladatum;
1810
1811         cladatum = hashtab_search(p->p_classes.table, name);
1812         if (!cladatum)
1813                 return 0;
1814
1815         return cladatum->value;
1816 }
1817
1818 u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name)
1819 {
1820         struct class_datum *cladatum;
1821         struct perm_datum *perdatum = NULL;
1822         struct common_datum *comdatum;
1823
1824         if (!tclass || tclass > p->p_classes.nprim)
1825                 return 0;
1826
1827         cladatum = p->class_val_to_struct[tclass-1];
1828         comdatum = cladatum->comdatum;
1829         if (comdatum)
1830                 perdatum = hashtab_search(comdatum->permissions.table,
1831                                           name);
1832         if (!perdatum)
1833                 perdatum = hashtab_search(cladatum->permissions.table,
1834                                           name);
1835         if (!perdatum)
1836                 return 0;
1837
1838         return 1U << (perdatum->value-1);
1839 }
1840
1841 static int range_read(struct policydb *p, void *fp)
1842 {
1843         struct range_trans *rt = NULL;
1844         struct mls_range *r = NULL;
1845         int i, rc;
1846         __le32 buf[2];
1847         u32 nel;
1848
1849         if (p->policyvers < POLICYDB_VERSION_MLS)
1850                 return 0;
1851
1852         rc = next_entry(buf, fp, sizeof(u32));
1853         if (rc)
1854                 goto out;
1855
1856         nel = le32_to_cpu(buf[0]);
1857         for (i = 0; i < nel; i++) {
1858                 rc = -ENOMEM;
1859                 rt = kzalloc(sizeof(*rt), GFP_KERNEL);
1860                 if (!rt)
1861                         goto out;
1862
1863                 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1864                 if (rc)
1865                         goto out;
1866
1867                 rt->source_type = le32_to_cpu(buf[0]);
1868                 rt->target_type = le32_to_cpu(buf[1]);
1869                 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
1870                         rc = next_entry(buf, fp, sizeof(u32));
1871                         if (rc)
1872                                 goto out;
1873                         rt->target_class = le32_to_cpu(buf[0]);
1874                 } else
1875                         rt->target_class = p->process_class;
1876
1877                 rc = -EINVAL;
1878                 if (!policydb_type_isvalid(p, rt->source_type) ||
1879                     !policydb_type_isvalid(p, rt->target_type) ||
1880                     !policydb_class_isvalid(p, rt->target_class))
1881                         goto out;
1882
1883                 rc = -ENOMEM;
1884                 r = kzalloc(sizeof(*r), GFP_KERNEL);
1885                 if (!r)
1886                         goto out;
1887
1888                 rc = mls_read_range_helper(r, fp);
1889                 if (rc)
1890                         goto out;
1891
1892                 rc = -EINVAL;
1893                 if (!mls_range_isvalid(p, r)) {
1894                         printk(KERN_WARNING "SELinux:  rangetrans:  invalid range\n");
1895                         goto out;
1896                 }
1897
1898                 rc = hashtab_insert(p->range_tr, rt, r);
1899                 if (rc)
1900                         goto out;
1901
1902                 rt = NULL;
1903                 r = NULL;
1904         }
1905         hash_eval(p->range_tr, "rangetr");
1906         rc = 0;
1907 out:
1908         kfree(rt);
1909         kfree(r);
1910         return rc;
1911 }
1912
1913 static int filename_trans_read(struct policydb *p, void *fp)
1914 {
1915         struct filename_trans *ft;
1916         struct filename_trans_datum *otype;
1917         char *name;
1918         u32 nel, len;
1919         __le32 buf[4];
1920         int rc, i;
1921
1922         if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
1923                 return 0;
1924
1925         rc = next_entry(buf, fp, sizeof(u32));
1926         if (rc)
1927                 return rc;
1928         nel = le32_to_cpu(buf[0]);
1929
1930         for (i = 0; i < nel; i++) {
1931                 ft = NULL;
1932                 otype = NULL;
1933                 name = NULL;
1934
1935                 rc = -ENOMEM;
1936                 ft = kzalloc(sizeof(*ft), GFP_KERNEL);
1937                 if (!ft)
1938                         goto out;
1939
1940                 rc = -ENOMEM;
1941                 otype = kmalloc(sizeof(*otype), GFP_KERNEL);
1942                 if (!otype)
1943                         goto out;
1944
1945                 /* length of the path component string */
1946                 rc = next_entry(buf, fp, sizeof(u32));
1947                 if (rc)
1948                         goto out;
1949                 len = le32_to_cpu(buf[0]);
1950
1951                 /* path component string */
1952                 rc = str_read(&name, GFP_KERNEL, fp, len);
1953                 if (rc)
1954                         goto out;
1955
1956                 ft->name = name;
1957
1958                 rc = next_entry(buf, fp, sizeof(u32) * 4);
1959                 if (rc)
1960                         goto out;
1961
1962                 ft->stype = le32_to_cpu(buf[0]);
1963                 ft->ttype = le32_to_cpu(buf[1]);
1964                 ft->tclass = le32_to_cpu(buf[2]);
1965
1966                 otype->otype = le32_to_cpu(buf[3]);
1967
1968                 rc = ebitmap_set_bit(&p->filename_trans_ttypes, ft->ttype, 1);
1969                 if (rc)
1970                         goto out;
1971
1972                 rc = hashtab_insert(p->filename_trans, ft, otype);
1973                 if (rc) {
1974                         /*
1975                          * Do not return -EEXIST to the caller, or the system
1976                          * will not boot.
1977                          */
1978                         if (rc != -EEXIST)
1979                                 goto out;
1980                         /* But free memory to avoid memory leak. */
1981                         kfree(ft);
1982                         kfree(name);
1983                         kfree(otype);
1984                 }
1985         }
1986         hash_eval(p->filename_trans, "filenametr");
1987         return 0;
1988 out:
1989         kfree(ft);
1990         kfree(name);
1991         kfree(otype);
1992
1993         return rc;
1994 }
1995
1996 static int genfs_read(struct policydb *p, void *fp)
1997 {
1998         int i, j, rc;
1999         u32 nel, nel2, len, len2;
2000         __le32 buf[1];
2001         struct ocontext *l, *c;
2002         struct ocontext *newc = NULL;
2003         struct genfs *genfs_p, *genfs;
2004         struct genfs *newgenfs = NULL;
2005
2006         rc = next_entry(buf, fp, sizeof(u32));
2007         if (rc)
2008                 goto out;
2009         nel = le32_to_cpu(buf[0]);
2010
2011         for (i = 0; i < nel; i++) {
2012                 rc = next_entry(buf, fp, sizeof(u32));
2013                 if (rc)
2014                         goto out;
2015                 len = le32_to_cpu(buf[0]);
2016
2017                 rc = -ENOMEM;
2018                 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
2019                 if (!newgenfs)
2020                         goto out;
2021
2022                 rc = str_read(&newgenfs->fstype, GFP_KERNEL, fp, len);
2023                 if (rc)
2024                         goto out;
2025
2026                 for (genfs_p = NULL, genfs = p->genfs; genfs;
2027                      genfs_p = genfs, genfs = genfs->next) {
2028                         rc = -EINVAL;
2029                         if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
2030                                 printk(KERN_ERR "SELinux:  dup genfs fstype %s\n",
2031                                        newgenfs->fstype);
2032                                 goto out;
2033                         }
2034                         if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
2035                                 break;
2036                 }
2037                 newgenfs->next = genfs;
2038                 if (genfs_p)
2039                         genfs_p->next = newgenfs;
2040                 else
2041                         p->genfs = newgenfs;
2042                 genfs = newgenfs;
2043                 newgenfs = NULL;
2044
2045                 rc = next_entry(buf, fp, sizeof(u32));
2046                 if (rc)
2047                         goto out;
2048
2049                 nel2 = le32_to_cpu(buf[0]);
2050                 for (j = 0; j < nel2; j++) {
2051                         rc = next_entry(buf, fp, sizeof(u32));
2052                         if (rc)
2053                                 goto out;
2054                         len = le32_to_cpu(buf[0]);
2055
2056                         rc = -ENOMEM;
2057                         newc = kzalloc(sizeof(*newc), GFP_KERNEL);
2058                         if (!newc)
2059                                 goto out;
2060
2061                         rc = str_read(&newc->u.name, GFP_KERNEL, fp, len);
2062                         if (rc)
2063                                 goto out;
2064
2065                         rc = next_entry(buf, fp, sizeof(u32));
2066                         if (rc)
2067                                 goto out;
2068
2069                         newc->v.sclass = le32_to_cpu(buf[0]);
2070                         rc = context_read_and_validate(&newc->context[0], p, fp);
2071                         if (rc)
2072                                 goto out;
2073
2074                         for (l = NULL, c = genfs->head; c;
2075                              l = c, c = c->next) {
2076                                 rc = -EINVAL;
2077                                 if (!strcmp(newc->u.name, c->u.name) &&
2078                                     (!c->v.sclass || !newc->v.sclass ||
2079                                      newc->v.sclass == c->v.sclass)) {
2080                                         printk(KERN_ERR "SELinux:  dup genfs entry (%s,%s)\n",
2081                                                genfs->fstype, c->u.name);
2082                                         goto out;
2083                                 }
2084                                 len = strlen(newc->u.name);
2085                                 len2 = strlen(c->u.name);
2086                                 if (len > len2)
2087                                         break;
2088                         }
2089
2090                         newc->next = c;
2091                         if (l)
2092                                 l->next = newc;
2093                         else
2094                                 genfs->head = newc;
2095                         newc = NULL;
2096                 }
2097         }
2098         rc = 0;
2099 out:
2100         if (newgenfs)
2101                 kfree(newgenfs->fstype);
2102         kfree(newgenfs);
2103         ocontext_destroy(newc, OCON_FSUSE);
2104
2105         return rc;
2106 }
2107
2108 static int ocontext_read(struct policydb *p, struct policydb_compat_info *info,
2109                          void *fp)
2110 {
2111         int i, j, rc;
2112         u32 nel, len;
2113         __le32 buf[3];
2114         struct ocontext *l, *c;
2115         u32 nodebuf[8];
2116
2117         for (i = 0; i < info->ocon_num; i++) {
2118                 rc = next_entry(buf, fp, sizeof(u32));
2119                 if (rc)
2120                         goto out;
2121                 nel = le32_to_cpu(buf[0]);
2122
2123                 l = NULL;
2124                 for (j = 0; j < nel; j++) {
2125                         rc = -ENOMEM;
2126                         c = kzalloc(sizeof(*c), GFP_KERNEL);
2127                         if (!c)
2128                                 goto out;
2129                         if (l)
2130                                 l->next = c;
2131                         else
2132                                 p->ocontexts[i] = c;
2133                         l = c;
2134
2135                         switch (i) {
2136                         case OCON_ISID:
2137                                 rc = next_entry(buf, fp, sizeof(u32));
2138                                 if (rc)
2139                                         goto out;
2140
2141                                 c->sid[0] = le32_to_cpu(buf[0]);
2142                                 rc = context_read_and_validate(&c->context[0], p, fp);
2143                                 if (rc)
2144                                         goto out;
2145                                 break;
2146                         case OCON_FS:
2147                         case OCON_NETIF:
2148                                 rc = next_entry(buf, fp, sizeof(u32));
2149                                 if (rc)
2150                                         goto out;
2151                                 len = le32_to_cpu(buf[0]);
2152
2153                                 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2154                                 if (rc)
2155                                         goto out;
2156
2157                                 rc = context_read_and_validate(&c->context[0], p, fp);
2158                                 if (rc)
2159                                         goto out;
2160                                 rc = context_read_and_validate(&c->context[1], p, fp);
2161                                 if (rc)
2162                                         goto out;
2163                                 break;
2164                         case OCON_PORT:
2165                                 rc = next_entry(buf, fp, sizeof(u32)*3);
2166                                 if (rc)
2167                                         goto out;
2168                                 c->u.port.protocol = le32_to_cpu(buf[0]);
2169                                 c->u.port.low_port = le32_to_cpu(buf[1]);
2170                                 c->u.port.high_port = le32_to_cpu(buf[2]);
2171                                 rc = context_read_and_validate(&c->context[0], p, fp);
2172                                 if (rc)
2173                                         goto out;
2174                                 break;
2175                         case OCON_NODE:
2176                                 rc = next_entry(nodebuf, fp, sizeof(u32) * 2);
2177                                 if (rc)
2178                                         goto out;
2179                                 c->u.node.addr = nodebuf[0]; /* network order */
2180                                 c->u.node.mask = nodebuf[1]; /* network order */
2181                                 rc = context_read_and_validate(&c->context[0], p, fp);
2182                                 if (rc)
2183                                         goto out;
2184                                 break;
2185                         case OCON_FSUSE:
2186                                 rc = next_entry(buf, fp, sizeof(u32)*2);
2187                                 if (rc)
2188                                         goto out;
2189
2190                                 rc = -EINVAL;
2191                                 c->v.behavior = le32_to_cpu(buf[0]);
2192                                 /* Determined at runtime, not in policy DB. */
2193                                 if (c->v.behavior == SECURITY_FS_USE_MNTPOINT)
2194                                         goto out;
2195                                 if (c->v.behavior > SECURITY_FS_USE_MAX)
2196                                         goto out;
2197
2198                                 len = le32_to_cpu(buf[1]);
2199                                 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2200                                 if (rc)
2201                                         goto out;
2202
2203                                 rc = context_read_and_validate(&c->context[0], p, fp);
2204                                 if (rc)
2205                                         goto out;
2206                                 break;
2207                         case OCON_NODE6: {
2208                                 int k;
2209
2210                                 rc = next_entry(nodebuf, fp, sizeof(u32) * 8);
2211                                 if (rc)
2212                                         goto out;
2213                                 for (k = 0; k < 4; k++)
2214                                         c->u.node6.addr[k] = nodebuf[k];
2215                                 for (k = 0; k < 4; k++)
2216                                         c->u.node6.mask[k] = nodebuf[k+4];
2217                                 rc = context_read_and_validate(&c->context[0], p, fp);
2218                                 if (rc)
2219                                         goto out;
2220                                 break;
2221                         }
2222                         }
2223                 }
2224         }
2225         rc = 0;
2226 out:
2227         return rc;
2228 }
2229
2230 /*
2231  * Read the configuration data from a policy database binary
2232  * representation file into a policy database structure.
2233  */
2234 int policydb_read(struct policydb *p, void *fp)
2235 {
2236         struct role_allow *ra, *lra;
2237         struct role_trans *tr, *ltr;
2238         int i, j, rc;
2239         __le32 buf[4];
2240         u32 len, nprim, nel;
2241
2242         char *policydb_str;
2243         struct policydb_compat_info *info;
2244
2245         rc = policydb_init(p);
2246         if (rc)
2247                 return rc;
2248
2249         /* Read the magic number and string length. */
2250         rc = next_entry(buf, fp, sizeof(u32) * 2);
2251         if (rc)
2252                 goto bad;
2253
2254         rc = -EINVAL;
2255         if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
2256                 printk(KERN_ERR "SELinux:  policydb magic number 0x%x does "
2257                        "not match expected magic number 0x%x\n",
2258                        le32_to_cpu(buf[0]), POLICYDB_MAGIC);
2259                 goto bad;
2260         }
2261
2262         rc = -EINVAL;
2263         len = le32_to_cpu(buf[1]);
2264         if (len != strlen(POLICYDB_STRING)) {
2265                 printk(KERN_ERR "SELinux:  policydb string length %d does not "
2266                        "match expected length %Zu\n",
2267                        len, strlen(POLICYDB_STRING));
2268                 goto bad;
2269         }
2270
2271         rc = -ENOMEM;
2272         policydb_str = kmalloc(len + 1, GFP_KERNEL);
2273         if (!policydb_str) {
2274                 printk(KERN_ERR "SELinux:  unable to allocate memory for policydb "
2275                        "string of length %d\n", len);
2276                 goto bad;
2277         }
2278
2279         rc = next_entry(policydb_str, fp, len);
2280         if (rc) {
2281                 printk(KERN_ERR "SELinux:  truncated policydb string identifier\n");
2282                 kfree(policydb_str);
2283                 goto bad;
2284         }
2285
2286         rc = -EINVAL;
2287         policydb_str[len] = '\0';
2288         if (strcmp(policydb_str, POLICYDB_STRING)) {
2289                 printk(KERN_ERR "SELinux:  policydb string %s does not match "
2290                        "my string %s\n", policydb_str, POLICYDB_STRING);
2291                 kfree(policydb_str);
2292                 goto bad;
2293         }
2294         /* Done with policydb_str. */
2295         kfree(policydb_str);
2296         policydb_str = NULL;
2297
2298         /* Read the version and table sizes. */
2299         rc = next_entry(buf, fp, sizeof(u32)*4);
2300         if (rc)
2301                 goto bad;
2302
2303         rc = -EINVAL;
2304         p->policyvers = le32_to_cpu(buf[0]);
2305         if (p->policyvers < POLICYDB_VERSION_MIN ||
2306             p->policyvers > POLICYDB_VERSION_MAX) {
2307                 printk(KERN_ERR "SELinux:  policydb version %d does not match "
2308                        "my version range %d-%d\n",
2309                        le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
2310                 goto bad;
2311         }
2312
2313         if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
2314                 p->mls_enabled = 1;
2315
2316                 rc = -EINVAL;
2317                 if (p->policyvers < POLICYDB_VERSION_MLS) {
2318                         printk(KERN_ERR "SELinux: security policydb version %d "
2319                                 "(MLS) not backwards compatible\n",
2320                                 p->policyvers);
2321                         goto bad;
2322                 }
2323         }
2324         p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
2325         p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
2326
2327         if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
2328                 rc = ebitmap_read(&p->policycaps, fp);
2329                 if (rc)
2330                         goto bad;
2331         }
2332
2333         if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
2334                 rc = ebitmap_read(&p->permissive_map, fp);
2335                 if (rc)
2336                         goto bad;
2337         }
2338
2339         rc = -EINVAL;
2340         info = policydb_lookup_compat(p->policyvers);
2341         if (!info) {
2342                 printk(KERN_ERR "SELinux:  unable to find policy compat info "
2343                        "for version %d\n", p->policyvers);
2344                 goto bad;
2345         }
2346
2347         rc = -EINVAL;
2348         if (le32_to_cpu(buf[2]) != info->sym_num ||
2349                 le32_to_cpu(buf[3]) != info->ocon_num) {
2350                 printk(KERN_ERR "SELinux:  policydb table sizes (%d,%d) do "
2351                        "not match mine (%d,%d)\n", le32_to_cpu(buf[2]),
2352                         le32_to_cpu(buf[3]),
2353                        info->sym_num, info->ocon_num);
2354                 goto bad;
2355         }
2356
2357         for (i = 0; i < info->sym_num; i++) {
2358                 rc = next_entry(buf, fp, sizeof(u32)*2);
2359                 if (rc)
2360                         goto bad;
2361                 nprim = le32_to_cpu(buf[0]);
2362                 nel = le32_to_cpu(buf[1]);
2363                 for (j = 0; j < nel; j++) {
2364                         rc = read_f[i](p, p->symtab[i].table, fp);
2365                         if (rc)
2366                                 goto bad;
2367                 }
2368
2369                 p->symtab[i].nprim = nprim;
2370         }
2371
2372         rc = -EINVAL;
2373         p->process_class = string_to_security_class(p, "process");
2374         if (!p->process_class)
2375                 goto bad;
2376
2377         rc = avtab_read(&p->te_avtab, fp, p);
2378         if (rc)
2379                 goto bad;
2380
2381         if (p->policyvers >= POLICYDB_VERSION_BOOL) {
2382                 rc = cond_read_list(p, fp);
2383                 if (rc)
2384                         goto bad;
2385         }
2386
2387         rc = next_entry(buf, fp, sizeof(u32));
2388         if (rc)
2389                 goto bad;
2390         nel = le32_to_cpu(buf[0]);
2391         ltr = NULL;
2392         for (i = 0; i < nel; i++) {
2393                 rc = -ENOMEM;
2394                 tr = kzalloc(sizeof(*tr), GFP_KERNEL);
2395                 if (!tr)
2396                         goto bad;
2397                 if (ltr)
2398                         ltr->next = tr;
2399                 else
2400                         p->role_tr = tr;
2401                 rc = next_entry(buf, fp, sizeof(u32)*3);
2402                 if (rc)
2403                         goto bad;
2404
2405                 rc = -EINVAL;
2406                 tr->role = le32_to_cpu(buf[0]);
2407                 tr->type = le32_to_cpu(buf[1]);
2408                 tr->new_role = le32_to_cpu(buf[2]);
2409                 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2410                         rc = next_entry(buf, fp, sizeof(u32));
2411                         if (rc)
2412                                 goto bad;
2413                         tr->tclass = le32_to_cpu(buf[0]);
2414                 } else
2415                         tr->tclass = p->process_class;
2416
2417                 if (!policydb_role_isvalid(p, tr->role) ||
2418                     !policydb_type_isvalid(p, tr->type) ||
2419                     !policydb_class_isvalid(p, tr->tclass) ||
2420                     !policydb_role_isvalid(p, tr->new_role))
2421                         goto bad;
2422                 ltr = tr;
2423         }
2424
2425         rc = next_entry(buf, fp, sizeof(u32));
2426         if (rc)
2427                 goto bad;
2428         nel = le32_to_cpu(buf[0]);
2429         lra = NULL;
2430         for (i = 0; i < nel; i++) {
2431                 rc = -ENOMEM;
2432                 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
2433                 if (!ra)
2434                         goto bad;
2435                 if (lra)
2436                         lra->next = ra;
2437                 else
2438                         p->role_allow = ra;
2439                 rc = next_entry(buf, fp, sizeof(u32)*2);
2440                 if (rc)
2441                         goto bad;
2442
2443                 rc = -EINVAL;
2444                 ra->role = le32_to_cpu(buf[0]);
2445                 ra->new_role = le32_to_cpu(buf[1]);
2446                 if (!policydb_role_isvalid(p, ra->role) ||
2447                     !policydb_role_isvalid(p, ra->new_role))
2448                         goto bad;
2449                 lra = ra;
2450         }
2451
2452         rc = filename_trans_read(p, fp);
2453         if (rc)
2454                 goto bad;
2455
2456         rc = policydb_index(p);
2457         if (rc)
2458                 goto bad;
2459
2460         rc = -EINVAL;
2461         p->process_trans_perms = string_to_av_perm(p, p->process_class, "transition");
2462         p->process_trans_perms |= string_to_av_perm(p, p->process_class, "dyntransition");
2463         if (!p->process_trans_perms)
2464                 goto bad;
2465
2466         rc = ocontext_read(p, info, fp);
2467         if (rc)
2468                 goto bad;
2469
2470         rc = genfs_read(p, fp);
2471         if (rc)
2472                 goto bad;
2473
2474         rc = range_read(p, fp);
2475         if (rc)
2476                 goto bad;
2477
2478         rc = -ENOMEM;
2479         p->type_attr_map_array = flex_array_alloc(sizeof(struct ebitmap),
2480                                                   p->p_types.nprim,
2481                                                   GFP_KERNEL | __GFP_ZERO);
2482         if (!p->type_attr_map_array)
2483                 goto bad;
2484
2485         /* preallocate so we don't have to worry about the put ever failing */
2486         rc = flex_array_prealloc(p->type_attr_map_array, 0, p->p_types.nprim,
2487                                  GFP_KERNEL | __GFP_ZERO);
2488         if (rc)
2489                 goto bad;
2490
2491         for (i = 0; i < p->p_types.nprim; i++) {
2492                 struct ebitmap *e = flex_array_get(p->type_attr_map_array, i);
2493
2494                 BUG_ON(!e);
2495                 ebitmap_init(e);
2496                 if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
2497                         rc = ebitmap_read(e, fp);
2498                         if (rc)
2499                                 goto bad;
2500                 }
2501                 /* add the type itself as the degenerate case */
2502                 rc = ebitmap_set_bit(e, i, 1);
2503                 if (rc)
2504                         goto bad;
2505         }
2506
2507         rc = policydb_bounds_sanity_check(p);
2508         if (rc)
2509                 goto bad;
2510
2511         rc = 0;
2512 out:
2513         return rc;
2514 bad:
2515         policydb_destroy(p);
2516         goto out;
2517 }
2518
2519 /*
2520  * Write a MLS level structure to a policydb binary
2521  * representation file.
2522  */
2523 static int mls_write_level(struct mls_level *l, void *fp)
2524 {
2525         __le32 buf[1];
2526         int rc;
2527
2528         buf[0] = cpu_to_le32(l->sens);
2529         rc = put_entry(buf, sizeof(u32), 1, fp);
2530         if (rc)
2531                 return rc;
2532
2533         rc = ebitmap_write(&l->cat, fp);
2534         if (rc)
2535                 return rc;
2536
2537         return 0;
2538 }
2539
2540 /*
2541  * Write a MLS range structure to a policydb binary
2542  * representation file.
2543  */
2544 static int mls_write_range_helper(struct mls_range *r, void *fp)
2545 {
2546         __le32 buf[3];
2547         size_t items;
2548         int rc, eq;
2549
2550         eq = mls_level_eq(&r->level[1], &r->level[0]);
2551
2552         if (eq)
2553                 items = 2;
2554         else
2555                 items = 3;
2556         buf[0] = cpu_to_le32(items-1);
2557         buf[1] = cpu_to_le32(r->level[0].sens);
2558         if (!eq)
2559                 buf[2] = cpu_to_le32(r->level[1].sens);
2560
2561         BUG_ON(items > ARRAY_SIZE(buf));
2562
2563         rc = put_entry(buf, sizeof(u32), items, fp);
2564         if (rc)
2565                 return rc;
2566
2567         rc = ebitmap_write(&r->level[0].cat, fp);
2568         if (rc)
2569                 return rc;
2570         if (!eq) {
2571                 rc = ebitmap_write(&r->level[1].cat, fp);
2572                 if (rc)
2573                         return rc;
2574         }
2575
2576         return 0;
2577 }
2578
2579 static int sens_write(void *vkey, void *datum, void *ptr)
2580 {
2581         char *key = vkey;
2582         struct level_datum *levdatum = datum;
2583         struct policy_data *pd = ptr;
2584         void *fp = pd->fp;
2585         __le32 buf[2];
2586         size_t len;
2587         int rc;
2588
2589         len = strlen(key);
2590         buf[0] = cpu_to_le32(len);
2591         buf[1] = cpu_to_le32(levdatum->isalias);
2592         rc = put_entry(buf, sizeof(u32), 2, fp);
2593         if (rc)
2594                 return rc;
2595
2596         rc = put_entry(key, 1, len, fp);
2597         if (rc)
2598                 return rc;
2599
2600         rc = mls_write_level(levdatum->level, fp);
2601         if (rc)
2602                 return rc;
2603
2604         return 0;
2605 }
2606
2607 static int cat_write(void *vkey, void *datum, void *ptr)
2608 {
2609         char *key = vkey;
2610         struct cat_datum *catdatum = datum;
2611         struct policy_data *pd = ptr;
2612         void *fp = pd->fp;
2613         __le32 buf[3];
2614         size_t len;
2615         int rc;
2616
2617         len = strlen(key);
2618         buf[0] = cpu_to_le32(len);
2619         buf[1] = cpu_to_le32(catdatum->value);
2620         buf[2] = cpu_to_le32(catdatum->isalias);
2621         rc = put_entry(buf, sizeof(u32), 3, fp);
2622         if (rc)
2623                 return rc;
2624
2625         rc = put_entry(key, 1, len, fp);
2626         if (rc)
2627                 return rc;
2628
2629         return 0;
2630 }
2631
2632 static int role_trans_write(struct policydb *p, void *fp)
2633 {
2634         struct role_trans *r = p->role_tr;
2635         struct role_trans *tr;
2636         u32 buf[3];
2637         size_t nel;
2638         int rc;
2639
2640         nel = 0;
2641         for (tr = r; tr; tr = tr->next)
2642                 nel++;
2643         buf[0] = cpu_to_le32(nel);
2644         rc = put_entry(buf, sizeof(u32), 1, fp);
2645         if (rc)
2646                 return rc;
2647         for (tr = r; tr; tr = tr->next) {
2648                 buf[0] = cpu_to_le32(tr->role);
2649                 buf[1] = cpu_to_le32(tr->type);
2650                 buf[2] = cpu_to_le32(tr->new_role);
2651                 rc = put_entry(buf, sizeof(u32), 3, fp);
2652                 if (rc)
2653                         return rc;
2654                 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2655                         buf[0] = cpu_to_le32(tr->tclass);
2656                         rc = put_entry(buf, sizeof(u32), 1, fp);
2657                         if (rc)
2658                                 return rc;
2659                 }
2660         }
2661
2662         return 0;
2663 }
2664
2665 static int role_allow_write(struct role_allow *r, void *fp)
2666 {
2667         struct role_allow *ra;
2668         u32 buf[2];
2669         size_t nel;
2670         int rc;
2671
2672         nel = 0;
2673         for (ra = r; ra; ra = ra->next)
2674                 nel++;
2675         buf[0] = cpu_to_le32(nel);
2676         rc = put_entry(buf, sizeof(u32), 1, fp);
2677         if (rc)
2678                 return rc;
2679         for (ra = r; ra; ra = ra->next) {
2680                 buf[0] = cpu_to_le32(ra->role);
2681                 buf[1] = cpu_to_le32(ra->new_role);
2682                 rc = put_entry(buf, sizeof(u32), 2, fp);
2683                 if (rc)
2684                         return rc;
2685         }
2686         return 0;
2687 }
2688
2689 /*
2690  * Write a security context structure
2691  * to a policydb binary representation file.
2692  */
2693 static int context_write(struct policydb *p, struct context *c,
2694                          void *fp)
2695 {
2696         int rc;
2697         __le32 buf[3];
2698
2699         buf[0] = cpu_to_le32(c->user);
2700         buf[1] = cpu_to_le32(c->role);
2701         buf[2] = cpu_to_le32(c->type);
2702
2703         rc = put_entry(buf, sizeof(u32), 3, fp);
2704         if (rc)
2705                 return rc;
2706
2707         rc = mls_write_range_helper(&c->range, fp);
2708         if (rc)
2709                 return rc;
2710
2711         return 0;
2712 }
2713
2714 /*
2715  * The following *_write functions are used to
2716  * write the symbol data to a policy database
2717  * binary representation file.
2718  */
2719
2720 static int perm_write(void *vkey, void *datum, void *fp)
2721 {
2722         char *key = vkey;
2723         struct perm_datum *perdatum = datum;
2724         __le32 buf[2];
2725         size_t len;
2726         int rc;
2727
2728         len = strlen(key);
2729         buf[0] = cpu_to_le32(len);
2730         buf[1] = cpu_to_le32(perdatum->value);
2731         rc = put_entry(buf, sizeof(u32), 2, fp);
2732         if (rc)
2733                 return rc;
2734
2735         rc = put_entry(key, 1, len, fp);
2736         if (rc)
2737                 return rc;
2738
2739         return 0;
2740 }
2741
2742 static int common_write(void *vkey, void *datum, void *ptr)
2743 {
2744         char *key = vkey;
2745         struct common_datum *comdatum = datum;
2746         struct policy_data *pd = ptr;
2747         void *fp = pd->fp;
2748         __le32 buf[4];
2749         size_t len;
2750         int rc;
2751
2752         len = strlen(key);
2753         buf[0] = cpu_to_le32(len);
2754         buf[1] = cpu_to_le32(comdatum->value);
2755         buf[2] = cpu_to_le32(comdatum->permissions.nprim);
2756         buf[3] = cpu_to_le32(comdatum->permissions.table->nel);
2757         rc = put_entry(buf, sizeof(u32), 4, fp);
2758         if (rc)
2759                 return rc;
2760
2761         rc = put_entry(key, 1, len, fp);
2762         if (rc)
2763                 return rc;
2764
2765         rc = hashtab_map(comdatum->permissions.table, perm_write, fp);
2766         if (rc)
2767                 return rc;
2768
2769         return 0;
2770 }
2771
2772 static int type_set_write(struct type_set *t, void *fp)
2773 {
2774         int rc;
2775         __le32 buf[1];
2776
2777         if (ebitmap_write(&t->types, fp))
2778                 return -EINVAL;
2779         if (ebitmap_write(&t->negset, fp))
2780                 return -EINVAL;
2781
2782         buf[0] = cpu_to_le32(t->flags);
2783         rc = put_entry(buf, sizeof(u32), 1, fp);
2784         if (rc)
2785                 return -EINVAL;
2786
2787         return 0;
2788 }
2789
2790 static int write_cons_helper(struct policydb *p, struct constraint_node *node,
2791                              void *fp)
2792 {
2793         struct constraint_node *c;
2794         struct constraint_expr *e;
2795         __le32 buf[3];
2796         u32 nel;
2797         int rc;
2798
2799         for (c = node; c; c = c->next) {
2800                 nel = 0;
2801                 for (e = c->expr; e; e = e->next)
2802                         nel++;
2803                 buf[0] = cpu_to_le32(c->permissions);
2804                 buf[1] = cpu_to_le32(nel);
2805                 rc = put_entry(buf, sizeof(u32), 2, fp);
2806                 if (rc)
2807                         return rc;
2808                 for (e = c->expr; e; e = e->next) {
2809                         buf[0] = cpu_to_le32(e->expr_type);
2810                         buf[1] = cpu_to_le32(e->attr);
2811                         buf[2] = cpu_to_le32(e->op);
2812                         rc = put_entry(buf, sizeof(u32), 3, fp);
2813                         if (rc)
2814                                 return rc;
2815
2816                         switch (e->expr_type) {
2817                         case CEXPR_NAMES:
2818                                 rc = ebitmap_write(&e->names, fp);
2819                                 if (rc)
2820                                         return rc;
2821                                 if (p->policyvers >=
2822                                         POLICYDB_VERSION_CONSTRAINT_NAMES) {
2823                                         rc = type_set_write(e->type_names, fp);
2824                                         if (rc)
2825                                                 return rc;
2826                                 }
2827                                 break;
2828                         default:
2829                                 break;
2830                         }
2831                 }
2832         }
2833
2834         return 0;
2835 }
2836
2837 static int class_write(void *vkey, void *datum, void *ptr)
2838 {
2839         char *key = vkey;
2840         struct class_datum *cladatum = datum;
2841         struct policy_data *pd = ptr;
2842         void *fp = pd->fp;
2843         struct policydb *p = pd->p;
2844         struct constraint_node *c;
2845         __le32 buf[6];
2846         u32 ncons;
2847         size_t len, len2;
2848         int rc;
2849
2850         len = strlen(key);
2851         if (cladatum->comkey)
2852                 len2 = strlen(cladatum->comkey);
2853         else
2854                 len2 = 0;
2855
2856         ncons = 0;
2857         for (c = cladatum->constraints; c; c = c->next)
2858                 ncons++;
2859
2860         buf[0] = cpu_to_le32(len);
2861         buf[1] = cpu_to_le32(len2);
2862         buf[2] = cpu_to_le32(cladatum->value);
2863         buf[3] = cpu_to_le32(cladatum->permissions.nprim);
2864         if (cladatum->permissions.table)
2865                 buf[4] = cpu_to_le32(cladatum->permissions.table->nel);
2866         else
2867                 buf[4] = 0;
2868         buf[5] = cpu_to_le32(ncons);
2869         rc = put_entry(buf, sizeof(u32), 6, fp);
2870         if (rc)
2871                 return rc;
2872
2873         rc = put_entry(key, 1, len, fp);
2874         if (rc)
2875                 return rc;
2876
2877         if (cladatum->comkey) {
2878                 rc = put_entry(cladatum->comkey, 1, len2, fp);
2879                 if (rc)
2880                         return rc;
2881         }
2882
2883         rc = hashtab_map(cladatum->permissions.table, perm_write, fp);
2884         if (rc)
2885                 return rc;
2886
2887         rc = write_cons_helper(p, cladatum->constraints, fp);
2888         if (rc)
2889                 return rc;
2890
2891         /* write out the validatetrans rule */
2892         ncons = 0;
2893         for (c = cladatum->validatetrans; c; c = c->next)
2894                 ncons++;
2895
2896         buf[0] = cpu_to_le32(ncons);
2897         rc = put_entry(buf, sizeof(u32), 1, fp);
2898         if (rc)
2899                 return rc;
2900
2901         rc = write_cons_helper(p, cladatum->validatetrans, fp);
2902         if (rc)
2903                 return rc;
2904
2905         if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
2906                 buf[0] = cpu_to_le32(cladatum->default_user);
2907                 buf[1] = cpu_to_le32(cladatum->default_role);
2908                 buf[2] = cpu_to_le32(cladatum->default_range);
2909
2910                 rc = put_entry(buf, sizeof(uint32_t), 3, fp);
2911                 if (rc)
2912                         return rc;
2913         }
2914
2915         if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
2916                 buf[0] = cpu_to_le32(cladatum->default_type);
2917                 rc = put_entry(buf, sizeof(uint32_t), 1, fp);
2918                 if (rc)
2919                         return rc;
2920         }
2921
2922         return 0;
2923 }
2924
2925 static int role_write(void *vkey, void *datum, void *ptr)
2926 {
2927         char *key = vkey;
2928         struct role_datum *role = datum;
2929         struct policy_data *pd = ptr;
2930         void *fp = pd->fp;
2931         struct policydb *p = pd->p;
2932         __le32 buf[3];
2933         size_t items, len;
2934         int rc;
2935
2936         len = strlen(key);
2937         items = 0;
2938         buf[items++] = cpu_to_le32(len);
2939         buf[items++] = cpu_to_le32(role->value);
2940         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
2941                 buf[items++] = cpu_to_le32(role->bounds);
2942
2943         BUG_ON(items > ARRAY_SIZE(buf));
2944
2945         rc = put_entry(buf, sizeof(u32), items, fp);
2946         if (rc)
2947                 return rc;
2948
2949         rc = put_entry(key, 1, len, fp);
2950         if (rc)
2951                 return rc;
2952
2953         rc = ebitmap_write(&role->dominates, fp);
2954         if (rc)
2955                 return rc;
2956
2957         rc = ebitmap_write(&role->types, fp);
2958         if (rc)
2959                 return rc;
2960
2961         return 0;
2962 }
2963
2964 static int type_write(void *vkey, void *datum, void *ptr)
2965 {
2966         char *key = vkey;
2967         struct type_datum *typdatum = datum;
2968         struct policy_data *pd = ptr;
2969         struct policydb *p = pd->p;
2970         void *fp = pd->fp;
2971         __le32 buf[4];
2972         int rc;
2973         size_t items, len;
2974
2975         len = strlen(key);
2976         items = 0;
2977         buf[items++] = cpu_to_le32(len);
2978         buf[items++] = cpu_to_le32(typdatum->value);
2979         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
2980                 u32 properties = 0;
2981
2982                 if (typdatum->primary)
2983                         properties |= TYPEDATUM_PROPERTY_PRIMARY;
2984
2985                 if (typdatum->attribute)
2986                         properties |= TYPEDATUM_PROPERTY_ATTRIBUTE;
2987
2988                 buf[items++] = cpu_to_le32(properties);
2989                 buf[items++] = cpu_to_le32(typdatum->bounds);
2990         } else {
2991                 buf[items++] = cpu_to_le32(typdatum->primary);
2992         }
2993         BUG_ON(items > ARRAY_SIZE(buf));
2994         rc = put_entry(buf, sizeof(u32), items, fp);
2995         if (rc)
2996                 return rc;
2997
2998         rc = put_entry(key, 1, len, fp);
2999         if (rc)
3000                 return rc;
3001
3002         return 0;
3003 }
3004
3005 static int user_write(void *vkey, void *datum, void *ptr)
3006 {
3007         char *key = vkey;
3008         struct user_datum *usrdatum = datum;
3009         struct policy_data *pd = ptr;
3010         struct policydb *p = pd->p;
3011         void *fp = pd->fp;
3012         __le32 buf[3];
3013         size_t items, len;
3014         int rc;
3015
3016         len = strlen(key);
3017         items = 0;
3018         buf[items++] = cpu_to_le32(len);
3019         buf[items++] = cpu_to_le32(usrdatum->value);
3020         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
3021                 buf[items++] = cpu_to_le32(usrdatum->bounds);
3022         BUG_ON(items > ARRAY_SIZE(buf));
3023         rc = put_entry(buf, sizeof(u32), items, fp);
3024         if (rc)
3025                 return rc;
3026
3027         rc = put_entry(key, 1, len, fp);
3028         if (rc)
3029                 return rc;
3030
3031         rc = ebitmap_write(&usrdatum->roles, fp);
3032         if (rc)
3033                 return rc;
3034
3035         rc = mls_write_range_helper(&usrdatum->range, fp);
3036         if (rc)
3037                 return rc;
3038
3039         rc = mls_write_level(&usrdatum->dfltlevel, fp);
3040         if (rc)
3041                 return rc;
3042
3043         return 0;
3044 }
3045
3046 static int (*write_f[SYM_NUM]) (void *key, void *datum,
3047                                 void *datap) =
3048 {
3049         common_write,
3050         class_write,
3051         role_write,
3052         type_write,
3053         user_write,
3054         cond_write_bool,
3055         sens_write,
3056         cat_write,
3057 };
3058
3059 static int ocontext_write(struct policydb *p, struct policydb_compat_info *info,
3060                           void *fp)
3061 {
3062         unsigned int i, j, rc;
3063         size_t nel, len;
3064         __le32 buf[3];
3065         u32 nodebuf[8];
3066         struct ocontext *c;
3067         for (i = 0; i < info->ocon_num; i++) {
3068                 nel = 0;
3069                 for (c = p->ocontexts[i]; c; c = c->next)
3070                         nel++;
3071                 buf[0] = cpu_to_le32(nel);
3072                 rc = put_entry(buf, sizeof(u32), 1, fp);
3073                 if (rc)
3074                         return rc;
3075                 for (c = p->ocontexts[i]; c; c = c->next) {
3076                         switch (i) {
3077                         case OCON_ISID:
3078                                 buf[0] = cpu_to_le32(c->sid[0]);
3079                                 rc = put_entry(buf, sizeof(u32), 1, fp);
3080                                 if (rc)
3081                                         return rc;
3082                                 rc = context_write(p, &c->context[0], fp);
3083                                 if (rc)
3084                                         return rc;
3085                                 break;
3086                         case OCON_FS:
3087                         case OCON_NETIF:
3088                                 len = strlen(c->u.name);
3089                                 buf[0] = cpu_to_le32(len);
3090                                 rc = put_entry(buf, sizeof(u32), 1, fp);
3091                                 if (rc)
3092                                         return rc;
3093                                 rc = put_entry(c->u.name, 1, len, fp);
3094                                 if (rc)
3095                                         return rc;
3096                                 rc = context_write(p, &c->context[0], fp);
3097                                 if (rc)
3098                                         return rc;
3099                                 rc = context_write(p, &c->context[1], fp);
3100                                 if (rc)
3101                                         return rc;
3102                                 break;
3103                         case OCON_PORT:
3104                                 buf[0] = cpu_to_le32(c->u.port.protocol);
3105                                 buf[1] = cpu_to_le32(c->u.port.low_port);
3106                                 buf[2] = cpu_to_le32(c->u.port.high_port);
3107                                 rc = put_entry(buf, sizeof(u32), 3, fp);
3108                                 if (rc)
3109                                         return rc;
3110                                 rc = context_write(p, &c->context[0], fp);
3111                                 if (rc)
3112                                         return rc;
3113                                 break;
3114                         case OCON_NODE:
3115                                 nodebuf[0] = c->u.node.addr; /* network order */
3116                                 nodebuf[1] = c->u.node.mask; /* network order */
3117                                 rc = put_entry(nodebuf, sizeof(u32), 2, fp);
3118                                 if (rc)
3119                                         return rc;
3120                                 rc = context_write(p, &c->context[0], fp);
3121                                 if (rc)
3122                                         return rc;
3123                                 break;
3124                         case OCON_FSUSE:
3125                                 buf[0] = cpu_to_le32(c->v.behavior);
3126                                 len = strlen(c->u.name);
3127                                 buf[1] = cpu_to_le32(len);
3128                                 rc = put_entry(buf, sizeof(u32), 2, fp);
3129                                 if (rc)
3130                                         return rc;
3131                                 rc = put_entry(c->u.name, 1, len, fp);
3132                                 if (rc)
3133                                         return rc;
3134                                 rc = context_write(p, &c->context[0], fp);
3135                                 if (rc)
3136                                         return rc;
3137                                 break;
3138                         case OCON_NODE6:
3139                                 for (j = 0; j < 4; j++)
3140                                         nodebuf[j] = c->u.node6.addr[j]; /* network order */
3141                                 for (j = 0; j < 4; j++)
3142                                         nodebuf[j + 4] = c->u.node6.mask[j]; /* network order */
3143                                 rc = put_entry(nodebuf, sizeof(u32), 8, fp);
3144                                 if (rc)
3145                                         return rc;
3146                                 rc = context_write(p, &c->context[0], fp);
3147                                 if (rc)
3148                                         return rc;
3149                                 break;
3150                         }
3151                 }
3152         }
3153         return 0;
3154 }
3155
3156 static int genfs_write(struct policydb *p, void *fp)
3157 {
3158         struct genfs *genfs;
3159         struct ocontext *c;
3160         size_t len;
3161         __le32 buf[1];
3162         int rc;
3163
3164         len = 0;
3165         for (genfs = p->genfs; genfs; genfs = genfs->next)
3166                 len++;
3167         buf[0] = cpu_to_le32(len);
3168         rc = put_entry(buf, sizeof(u32), 1, fp);
3169         if (rc)
3170                 return rc;
3171         for (genfs = p->genfs; genfs; genfs = genfs->next) {
3172                 len = strlen(genfs->fstype);
3173                 buf[0] = cpu_to_le32(len);
3174                 rc = put_entry(buf, sizeof(u32), 1, fp);
3175                 if (rc)
3176                         return rc;
3177                 rc = put_entry(genfs->fstype, 1, len, fp);
3178                 if (rc)
3179                         return rc;
3180                 len = 0;
3181                 for (c = genfs->head; c; c = c->next)
3182                         len++;
3183                 buf[0] = cpu_to_le32(len);
3184                 rc = put_entry(buf, sizeof(u32), 1, fp);
3185                 if (rc)
3186                         return rc;
3187                 for (c = genfs->head; c; c = c->next) {
3188                         len = strlen(c->u.name);
3189                         buf[0] = cpu_to_le32(len);
3190                         rc = put_entry(buf, sizeof(u32), 1, fp);
3191                         if (rc)
3192                                 return rc;
3193                         rc = put_entry(c->u.name, 1, len, fp);
3194                         if (rc)
3195                                 return rc;
3196                         buf[0] = cpu_to_le32(c->v.sclass);
3197                         rc = put_entry(buf, sizeof(u32), 1, fp);
3198                         if (rc)
3199                                 return rc;
3200                         rc = context_write(p, &c->context[0], fp);
3201                         if (rc)
3202                                 return rc;
3203                 }
3204         }
3205         return 0;
3206 }
3207
3208 static int hashtab_cnt(void *key, void *data, void *ptr)
3209 {
3210         int *cnt = ptr;
3211         *cnt = *cnt + 1;
3212
3213         return 0;
3214 }
3215
3216 static int range_write_helper(void *key, void *data, void *ptr)
3217 {
3218         __le32 buf[2];
3219         struct range_trans *rt = key;
3220         struct mls_range *r = data;
3221         struct policy_data *pd = ptr;
3222         void *fp = pd->fp;
3223         struct policydb *p = pd->p;
3224         int rc;
3225
3226         buf[0] = cpu_to_le32(rt->source_type);
3227         buf[1] = cpu_to_le32(rt->target_type);
3228         rc = put_entry(buf, sizeof(u32), 2, fp);
3229         if (rc)
3230                 return rc;
3231         if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
3232                 buf[0] = cpu_to_le32(rt->target_class);
3233                 rc = put_entry(buf, sizeof(u32), 1, fp);
3234                 if (rc)
3235                         return rc;
3236         }
3237         rc = mls_write_range_helper(r, fp);
3238         if (rc)
3239                 return rc;
3240
3241         return 0;
3242 }
3243
3244 static int range_write(struct policydb *p, void *fp)
3245 {
3246         __le32 buf[1];
3247         int rc, nel;
3248         struct policy_data pd;
3249
3250         pd.p = p;
3251         pd.fp = fp;
3252
3253         /* count the number of entries in the hashtab */
3254         nel = 0;
3255         rc = hashtab_map(p->range_tr, hashtab_cnt, &nel);
3256         if (rc)
3257                 return rc;
3258
3259         buf[0] = cpu_to_le32(nel);
3260         rc = put_entry(buf, sizeof(u32), 1, fp);
3261         if (rc)
3262                 return rc;
3263
3264         /* actually write all of the entries */
3265         rc = hashtab_map(p->range_tr, range_write_helper, &pd);
3266         if (rc)
3267                 return rc;
3268
3269         return 0;
3270 }
3271
3272 static int filename_write_helper(void *key, void *data, void *ptr)
3273 {
3274         __le32 buf[4];
3275         struct filename_trans *ft = key;
3276         struct filename_trans_datum *otype = data;
3277         void *fp = ptr;
3278         int rc;
3279         u32 len;
3280
3281         len = strlen(ft->name);
3282         buf[0] = cpu_to_le32(len);
3283         rc = put_entry(buf, sizeof(u32), 1, fp);
3284         if (rc)
3285                 return rc;
3286
3287         rc = put_entry(ft->name, sizeof(char), len, fp);
3288         if (rc)
3289                 return rc;
3290
3291         buf[0] = cpu_to_le32(ft->stype);
3292         buf[1] = cpu_to_le32(ft->ttype);
3293         buf[2] = cpu_to_le32(ft->tclass);
3294         buf[3] = cpu_to_le32(otype->otype);
3295
3296         rc = put_entry(buf, sizeof(u32), 4, fp);
3297         if (rc)
3298                 return rc;
3299
3300         return 0;
3301 }
3302
3303 static int filename_trans_write(struct policydb *p, void *fp)
3304 {
3305         u32 nel;
3306         __le32 buf[1];
3307         int rc;
3308
3309         if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
3310                 return 0;
3311
3312         nel = 0;
3313         rc = hashtab_map(p->filename_trans, hashtab_cnt, &nel);
3314         if (rc)
3315                 return rc;
3316
3317         buf[0] = cpu_to_le32(nel);
3318         rc = put_entry(buf, sizeof(u32), 1, fp);
3319         if (rc)
3320                 return rc;
3321
3322         rc = hashtab_map(p->filename_trans, filename_write_helper, fp);
3323         if (rc)
3324                 return rc;
3325
3326         return 0;
3327 }
3328
3329 /*
3330  * Write the configuration data in a policy database
3331  * structure to a policy database binary representation
3332  * file.
3333  */
3334 int policydb_write(struct policydb *p, void *fp)
3335 {
3336         unsigned int i, num_syms;
3337         int rc;
3338         __le32 buf[4];
3339         u32 config;
3340         size_t len;
3341         struct policydb_compat_info *info;
3342
3343         /*
3344          * refuse to write policy older than compressed avtab
3345          * to simplify the writer.  There are other tests dropped
3346          * since we assume this throughout the writer code.  Be
3347          * careful if you ever try to remove this restriction
3348          */
3349         if (p->policyvers < POLICYDB_VERSION_AVTAB) {
3350                 printk(KERN_ERR "SELinux: refusing to write policy version %d."
3351                        "  Because it is less than version %d\n", p->policyvers,
3352                        POLICYDB_VERSION_AVTAB);
3353                 return -EINVAL;
3354         }
3355
3356         config = 0;
3357         if (p->mls_enabled)
3358                 config |= POLICYDB_CONFIG_MLS;
3359
3360         if (p->reject_unknown)
3361                 config |= REJECT_UNKNOWN;
3362         if (p->allow_unknown)
3363                 config |= ALLOW_UNKNOWN;
3364
3365         /* Write the magic number and string identifiers. */
3366         buf[0] = cpu_to_le32(POLICYDB_MAGIC);
3367         len = strlen(POLICYDB_STRING);
3368         buf[1] = cpu_to_le32(len);
3369         rc = put_entry(buf, sizeof(u32), 2, fp);
3370         if (rc)
3371                 return rc;
3372         rc = put_entry(POLICYDB_STRING, 1, len, fp);
3373         if (rc)
3374                 return rc;
3375
3376         /* Write the version, config, and table sizes. */
3377         info = policydb_lookup_compat(p->policyvers);
3378         if (!info) {
3379                 printk(KERN_ERR "SELinux: compatibility lookup failed for policy "
3380                     "version %d", p->policyvers);
3381                 return -EINVAL;
3382         }
3383
3384         buf[0] = cpu_to_le32(p->policyvers);
3385         buf[1] = cpu_to_le32(config);
3386         buf[2] = cpu_to_le32(info->sym_num);
3387         buf[3] = cpu_to_le32(info->ocon_num);
3388
3389         rc = put_entry(buf, sizeof(u32), 4, fp);
3390         if (rc)
3391                 return rc;
3392
3393         if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
3394                 rc = ebitmap_write(&p->policycaps, fp);
3395                 if (rc)
3396                         return rc;
3397         }
3398
3399         if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
3400                 rc = ebitmap_write(&p->permissive_map, fp);
3401                 if (rc)
3402                         return rc;
3403         }
3404
3405         num_syms = info->sym_num;
3406         for (i = 0; i < num_syms; i++) {
3407                 struct policy_data pd;
3408
3409                 pd.fp = fp;
3410                 pd.p = p;
3411
3412                 buf[0] = cpu_to_le32(p->symtab[i].nprim);
3413                 buf[1] = cpu_to_le32(p->symtab[i].table->nel);
3414
3415                 rc = put_entry(buf, sizeof(u32), 2, fp);
3416                 if (rc)
3417                         return rc;
3418                 rc = hashtab_map(p->symtab[i].table, write_f[i], &pd);
3419                 if (rc)
3420                         return rc;
3421         }
3422
3423         rc = avtab_write(p, &p->te_avtab, fp);
3424         if (rc)
3425                 return rc;
3426
3427         rc = cond_write_list(p, p->cond_list, fp);
3428         if (rc)
3429                 return rc;
3430
3431         rc = role_trans_write(p, fp);
3432         if (rc)
3433                 return rc;
3434
3435         rc = role_allow_write(p->role_allow, fp);
3436         if (rc)
3437                 return rc;
3438
3439         rc = filename_trans_write(p, fp);
3440         if (rc)
3441                 return rc;
3442
3443         rc = ocontext_write(p, info, fp);
3444         if (rc)
3445                 return rc;
3446
3447         rc = genfs_write(p, fp);
3448         if (rc)
3449                 return rc;
3450
3451         rc = range_write(p, fp);
3452         if (rc)
3453                 return rc;
3454
3455         for (i = 0; i < p->p_types.nprim; i++) {
3456                 struct ebitmap *e = flex_array_get(p->type_attr_map_array, i);
3457
3458                 BUG_ON(!e);
3459                 rc = ebitmap_write(e, fp);
3460                 if (rc)
3461                         return rc;
3462         }
3463
3464         return 0;
3465 }