Pileus Git - ~andy/linux/blob - security/selinux/ss/policydb.c

   1 /*
   2  * Implementation of the policy database.
   3  *
   4  * Author : Stephen Smalley, <sds@epoch.ncsc.mil>
   5  */
   6
   7 /*
   8  * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
   9  *
  10  *      Support for enhanced MLS infrastructure.
  11  *
  12  * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
  13  *
  14  *      Added conditional policy language extensions
  15  *
  16  * Updated: Hewlett-Packard <paul@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
 143 static struct policydb_compat_info *policydb_lookup_compat(int version)
 144 {
 145         int i;
 146         struct policydb_compat_info *info = NULL;
 147
 148         for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) {
 149                 if (policydb_compat[i].version == version) {
 150                         info = &policydb_compat[i];
 151                         break;
 152                 }
 153         }
 154         return info;
 155 }
 156
 157 /*
 158  * Initialize the role table.
 159  */
 160 static int roles_init(struct policydb *p)
 161 {
 162         char *key = NULL;
 163         int rc;
 164         struct role_datum *role;
 165
 166         rc = -ENOMEM;
 167         role = kzalloc(sizeof(*role), GFP_KERNEL);
 168         if (!role)
 169                 goto out;
 170
 171         rc = -EINVAL;
 172         role->value = ++p->p_roles.nprim;
 173         if (role->value != OBJECT_R_VAL)
 174                 goto out;
 175
 176         rc = -ENOMEM;
 177         key = kstrdup(OBJECT_R, GFP_KERNEL);
 178         if (!key)
 179                 goto out;
 180
 181         rc = hashtab_insert(p->p_roles.table, key, role);
 182         if (rc)
 183                 goto out;
 184
 185         return 0;
 186 out:
 187         kfree(key);
 188         kfree(role);
 189         return rc;
 190 }
 191
 192 static u32 filenametr_hash(struct hashtab *h, const void *k)
 193 {
 194         const struct filename_trans *ft = k;
 195         unsigned long hash;
 196         unsigned int byte_num;
 197         unsigned char focus;
 198
 199         hash = ft->stype ^ ft->ttype ^ ft->tclass;
 200
 201         byte_num = 0;
 202         while ((focus = ft->name[byte_num++]))
 203                 hash = partial_name_hash(focus, hash);
 204         return hash & (h->size - 1);
 205 }
 206
 207 static int filenametr_cmp(struct hashtab *h, const void *k1, const void *k2)
 208 {
 209         const struct filename_trans *ft1 = k1;
 210         const struct filename_trans *ft2 = k2;
 211         int v;
 212
 213         v = ft1->stype - ft2->stype;
 214         if (v)
 215                 return v;
 216
 217         v = ft1->ttype - ft2->ttype;
 218         if (v)
 219                 return v;
 220
 221         v = ft1->tclass - ft2->tclass;
 222         if (v)
 223                 return v;
 224
 225         return strcmp(ft1->name, ft2->name);
 226
 227 }
 228
 229 static u32 rangetr_hash(struct hashtab *h, const void *k)
 230 {
 231         const struct range_trans *key = k;
 232         return (key->source_type + (key->target_type << 3) +
 233                 (key->target_class << 5)) & (h->size - 1);
 234 }
 235
 236 static int rangetr_cmp(struct hashtab *h, const void *k1, const void *k2)
 237 {
 238         const struct range_trans *key1 = k1, *key2 = k2;
 239         int v;
 240
 241         v = key1->source_type - key2->source_type;
 242         if (v)
 243                 return v;
 244
 245         v = key1->target_type - key2->target_type;
 246         if (v)
 247                 return v;
 248
 249         v = key1->target_class - key2->target_class;
 250
 251         return v;
 252 }
 253
 254 /*
 255  * Initialize a policy database structure.
 256  */
 257 static int policydb_init(struct policydb *p)
 258 {
 259         int i, rc;
 260
 261         memset(p, 0, sizeof(*p));
 262
 263         for (i = 0; i < SYM_NUM; i++) {
 264                 rc = symtab_init(&p->symtab[i], symtab_sizes[i]);
 265                 if (rc)
 266                         goto out;
 267         }
 268
 269         rc = avtab_init(&p->te_avtab);
 270         if (rc)
 271                 goto out;
 272
 273         rc = roles_init(p);
 274         if (rc)
 275                 goto out;
 276
 277         rc = cond_policydb_init(p);
 278         if (rc)
 279                 goto out;
 280
 281         p->filename_trans = hashtab_create(filenametr_hash, filenametr_cmp, (1 << 10));
 282         if (!p->filename_trans)
 283                 goto out;
 284
 285         p->range_tr = hashtab_create(rangetr_hash, rangetr_cmp, 256);
 286         if (!p->range_tr)
 287                 goto out;
 288
 289         ebitmap_init(&p->filename_trans_ttypes);
 290         ebitmap_init(&p->policycaps);
 291         ebitmap_init(&p->permissive_map);
 292
 293         return 0;
 294 out:
 295         hashtab_destroy(p->filename_trans);
 296         hashtab_destroy(p->range_tr);
 297         for (i = 0; i < SYM_NUM; i++)
 298                 hashtab_destroy(p->symtab[i].table);
 299         return rc;
 300 }
 301
 302 /*
 303  * The following *_index functions are used to
 304  * define the val_to_name and val_to_struct arrays
 305  * in a policy database structure.  The val_to_name
 306  * arrays are used when converting security context
 307  * structures into string representations.  The
 308  * val_to_struct arrays are used when the attributes
 309  * of a class, role, or user are needed.
 310  */
 311
 312 static int common_index(void *key, void *datum, void *datap)
 313 {
 314         struct policydb *p;
 315         struct common_datum *comdatum;
 316         struct flex_array *fa;
 317
 318         comdatum = datum;
 319         p = datap;
 320         if (!comdatum->value || comdatum->value > p->p_commons.nprim)
 321                 return -EINVAL;
 322
 323         fa = p->sym_val_to_name[SYM_COMMONS];
 324         if (flex_array_put_ptr(fa, comdatum->value - 1, key,
 325                                GFP_KERNEL | __GFP_ZERO))
 326                 BUG();
 327         return 0;
 328 }
 329
 330 static int class_index(void *key, void *datum, void *datap)
 331 {
 332         struct policydb *p;
 333         struct class_datum *cladatum;
 334         struct flex_array *fa;
 335
 336         cladatum = datum;
 337         p = datap;
 338         if (!cladatum->value || cladatum->value > p->p_classes.nprim)
 339                 return -EINVAL;
 340         fa = p->sym_val_to_name[SYM_CLASSES];
 341         if (flex_array_put_ptr(fa, cladatum->value - 1, key,
 342                                GFP_KERNEL | __GFP_ZERO))
 343                 BUG();
 344         p->class_val_to_struct[cladatum->value - 1] = cladatum;
 345         return 0;
 346 }
 347
 348 static int role_index(void *key, void *datum, void *datap)
 349 {
 350         struct policydb *p;
 351         struct role_datum *role;
 352         struct flex_array *fa;
 353
 354         role = datum;
 355         p = datap;
 356         if (!role->value
 357             || role->value > p->p_roles.nprim
 358             || role->bounds > p->p_roles.nprim)
 359                 return -EINVAL;
 360
 361         fa = p->sym_val_to_name[SYM_ROLES];
 362         if (flex_array_put_ptr(fa, role->value - 1, key,
 363                                GFP_KERNEL | __GFP_ZERO))
 364                 BUG();
 365         p->role_val_to_struct[role->value - 1] = role;
 366         return 0;
 367 }
 368
 369 static int type_index(void *key, void *datum, void *datap)
 370 {
 371         struct policydb *p;
 372         struct type_datum *typdatum;
 373         struct flex_array *fa;
 374
 375         typdatum = datum;
 376         p = datap;
 377
 378         if (typdatum->primary) {
 379                 if (!typdatum->value
 380                     || typdatum->value > p->p_types.nprim
 381                     || typdatum->bounds > p->p_types.nprim)
 382                         return -EINVAL;
 383                 fa = p->sym_val_to_name[SYM_TYPES];
 384                 if (flex_array_put_ptr(fa, typdatum->value - 1, key,
 385                                        GFP_KERNEL | __GFP_ZERO))
 386                         BUG();
 387
 388                 fa = p->type_val_to_struct_array;
 389                 if (flex_array_put_ptr(fa, typdatum->value - 1, typdatum,
 390                                        GFP_KERNEL | __GFP_ZERO))
 391                         BUG();
 392         }
 393
 394         return 0;
 395 }
 396
 397 static int user_index(void *key, void *datum, void *datap)
 398 {
 399         struct policydb *p;
 400         struct user_datum *usrdatum;
 401         struct flex_array *fa;
 402
 403         usrdatum = datum;
 404         p = datap;
 405         if (!usrdatum->value
 406             || usrdatum->value > p->p_users.nprim
 407             || usrdatum->bounds > p->p_users.nprim)
 408                 return -EINVAL;
 409
 410         fa = p->sym_val_to_name[SYM_USERS];
 411         if (flex_array_put_ptr(fa, usrdatum->value - 1, key,
 412                                GFP_KERNEL | __GFP_ZERO))
 413                 BUG();
 414         p->user_val_to_struct[usrdatum->value - 1] = usrdatum;
 415         return 0;
 416 }
 417
 418 static int sens_index(void *key, void *datum, void *datap)
 419 {
 420         struct policydb *p;
 421         struct level_datum *levdatum;
 422         struct flex_array *fa;
 423
 424         levdatum = datum;
 425         p = datap;
 426
 427         if (!levdatum->isalias) {
 428                 if (!levdatum->level->sens ||
 429                     levdatum->level->sens > p->p_levels.nprim)
 430                         return -EINVAL;
 431                 fa = p->sym_val_to_name[SYM_LEVELS];
 432                 if (flex_array_put_ptr(fa, levdatum->level->sens - 1, key,
 433                                        GFP_KERNEL | __GFP_ZERO))
 434                         BUG();
 435         }
 436
 437         return 0;
 438 }
 439
 440 static int cat_index(void *key, void *datum, void *datap)
 441 {
 442         struct policydb *p;
 443         struct cat_datum *catdatum;
 444         struct flex_array *fa;
 445
 446         catdatum = datum;
 447         p = datap;
 448
 449         if (!catdatum->isalias) {
 450                 if (!catdatum->value || catdatum->value > p->p_cats.nprim)
 451                         return -EINVAL;
 452                 fa = p->sym_val_to_name[SYM_CATS];
 453                 if (flex_array_put_ptr(fa, catdatum->value - 1, key,
 454                                        GFP_KERNEL | __GFP_ZERO))
 455                         BUG();
 456         }
 457
 458         return 0;
 459 }
 460
 461 static int (*index_f[SYM_NUM]) (void *key, void *datum, void *datap) =
 462 {
 463         common_index,
 464         class_index,
 465         role_index,
 466         type_index,
 467         user_index,
 468         cond_index_bool,
 469         sens_index,
 470         cat_index,
 471 };
 472
 473 #ifdef DEBUG_HASHES
 474 static void hash_eval(struct hashtab *h, const char *hash_name)
 475 {
 476         struct hashtab_info info;
 477
 478         hashtab_stat(h, &info);
 479         printk(KERN_DEBUG "SELinux: %s:  %d entries and %d/%d buckets used, "
 480                "longest chain length %d\n", hash_name, h->nel,
 481                info.slots_used, h->size, info.max_chain_len);
 482 }
 483
 484 static void symtab_hash_eval(struct symtab *s)
 485 {
 486         int i;
 487
 488         for (i = 0; i < SYM_NUM; i++)
 489                 hash_eval(s[i].table, symtab_name[i]);
 490 }
 491
 492 #else
 493 static inline void hash_eval(struct hashtab *h, char *hash_name)
 494 {
 495 }
 496 #endif
 497
 498 /*
 499  * Define the other val_to_name and val_to_struct arrays
 500  * in a policy database structure.
 501  *
 502  * Caller must clean up on failure.
 503  */
 504 static int policydb_index(struct policydb *p)
 505 {
 506         int i, rc;
 507
 508         printk(KERN_DEBUG "SELinux:  %d users, %d roles, %d types, %d bools",
 509                p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim, p->p_bools.nprim);
 510         if (p->mls_enabled)
 511                 printk(", %d sens, %d cats", p->p_levels.nprim,
 512                        p->p_cats.nprim);
 513         printk("\n");
 514
 515         printk(KERN_DEBUG "SELinux:  %d classes, %d rules\n",
 516                p->p_classes.nprim, p->te_avtab.nel);
 517
 518 #ifdef DEBUG_HASHES
 519         avtab_hash_eval(&p->te_avtab, "rules");
 520         symtab_hash_eval(p->symtab);
 521 #endif
 522
 523         rc = -ENOMEM;
 524         p->class_val_to_struct =
 525                 kmalloc(p->p_classes.nprim * sizeof(*(p->class_val_to_struct)),
 526                         GFP_KERNEL);
 527         if (!p->class_val_to_struct)
 528                 goto out;
 529
 530         rc = -ENOMEM;
 531         p->role_val_to_struct =
 532                 kmalloc(p->p_roles.nprim * sizeof(*(p->role_val_to_struct)),
 533                         GFP_KERNEL);
 534         if (!p->role_val_to_struct)
 535                 goto out;
 536
 537         rc = -ENOMEM;
 538         p->user_val_to_struct =
 539                 kmalloc(p->p_users.nprim * sizeof(*(p->user_val_to_struct)),
 540                         GFP_KERNEL);
 541         if (!p->user_val_to_struct)
 542                 goto out;
 543
 544         /* Yes, I want the sizeof the pointer, not the structure */
 545         rc = -ENOMEM;
 546         p->type_val_to_struct_array = flex_array_alloc(sizeof(struct type_datum *),
 547                                                        p->p_types.nprim,
 548                                                        GFP_KERNEL | __GFP_ZERO);
 549         if (!p->type_val_to_struct_array)
 550                 goto out;
 551
 552         rc = flex_array_prealloc(p->type_val_to_struct_array, 0,
 553                                  p->p_types.nprim, GFP_KERNEL | __GFP_ZERO);
 554         if (rc)
 555                 goto out;
 556
 557         rc = cond_init_bool_indexes(p);
 558         if (rc)
 559                 goto out;
 560
 561         for (i = 0; i < SYM_NUM; i++) {
 562                 rc = -ENOMEM;
 563                 p->sym_val_to_name[i] = flex_array_alloc(sizeof(char *),
 564                                                          p->symtab[i].nprim,
 565                                                          GFP_KERNEL | __GFP_ZERO);
 566                 if (!p->sym_val_to_name[i])
 567                         goto out;
 568
 569                 rc = flex_array_prealloc(p->sym_val_to_name[i],
 570                                          0, p->symtab[i].nprim,
 571                                          GFP_KERNEL | __GFP_ZERO);
 572                 if (rc)
 573                         goto out;
 574
 575                 rc = hashtab_map(p->symtab[i].table, index_f[i], p);
 576                 if (rc)
 577                         goto out;
 578         }
 579         rc = 0;
 580 out:
 581         return rc;
 582 }
 583
 584 /*
 585  * The following *_destroy functions are used to
 586  * free any memory allocated for each kind of
 587  * symbol data in the policy database.
 588  */
 589
 590 static int perm_destroy(void *key, void *datum, void *p)
 591 {
 592         kfree(key);
 593         kfree(datum);
 594         return 0;
 595 }
 596
 597 static int common_destroy(void *key, void *datum, void *p)
 598 {
 599         struct common_datum *comdatum;
 600
 601         kfree(key);
 602         if (datum) {
 603                 comdatum = datum;
 604                 hashtab_map(comdatum->permissions.table, perm_destroy, NULL);
 605                 hashtab_destroy(comdatum->permissions.table);
 606         }
 607         kfree(datum);
 608         return 0;
 609 }
 610
 611 static int cls_destroy(void *key, void *datum, void *p)
 612 {
 613         struct class_datum *cladatum;
 614         struct constraint_node *constraint, *ctemp;
 615         struct constraint_expr *e, *etmp;
 616
 617         kfree(key);
 618         if (datum) {
 619                 cladatum = datum;
 620                 hashtab_map(cladatum->permissions.table, perm_destroy, NULL);
 621                 hashtab_destroy(cladatum->permissions.table);
 622                 constraint = cladatum->constraints;
 623                 while (constraint) {
 624                         e = constraint->expr;
 625                         while (e) {
 626                                 ebitmap_destroy(&e->names);
 627                                 etmp = e;
 628                                 e = e->next;
 629                                 kfree(etmp);
 630                         }
 631                         ctemp = constraint;
 632                         constraint = constraint->next;
 633                         kfree(ctemp);
 634                 }
 635
 636                 constraint = cladatum->validatetrans;
 637                 while (constraint) {
 638                         e = constraint->expr;
 639                         while (e) {
 640                                 ebitmap_destroy(&e->names);
 641                                 etmp = e;
 642                                 e = e->next;
 643                                 kfree(etmp);
 644                         }
 645                         ctemp = constraint;
 646                         constraint = constraint->next;
 647                         kfree(ctemp);
 648                 }
 649
 650                 kfree(cladatum->comkey);
 651         }
 652         kfree(datum);
 653         return 0;
 654 }
 655
 656 static int role_destroy(void *key, void *datum, void *p)
 657 {
 658         struct role_datum *role;
 659
 660         kfree(key);
 661         if (datum) {
 662                 role = datum;
 663                 ebitmap_destroy(&role->dominates);
 664                 ebitmap_destroy(&role->types);
 665         }
 666         kfree(datum);
 667         return 0;
 668 }
 669
 670 static int type_destroy(void *key, void *datum, void *p)
 671 {
 672         kfree(key);
 673         kfree(datum);
 674         return 0;
 675 }
 676
 677 static int user_destroy(void *key, void *datum, void *p)
 678 {
 679         struct user_datum *usrdatum;
 680
 681         kfree(key);
 682         if (datum) {
 683                 usrdatum = datum;
 684                 ebitmap_destroy(&usrdatum->roles);
 685                 ebitmap_destroy(&usrdatum->range.level[0].cat);
 686                 ebitmap_destroy(&usrdatum->range.level[1].cat);
 687                 ebitmap_destroy(&usrdatum->dfltlevel.cat);
 688         }
 689         kfree(datum);
 690         return 0;
 691 }
 692
 693 static int sens_destroy(void *key, void *datum, void *p)
 694 {
 695         struct level_datum *levdatum;
 696
 697         kfree(key);
 698         if (datum) {
 699                 levdatum = datum;
 700                 ebitmap_destroy(&levdatum->level->cat);
 701                 kfree(levdatum->level);
 702         }
 703         kfree(datum);
 704         return 0;
 705 }
 706
 707 static int cat_destroy(void *key, void *datum, void *p)
 708 {
 709         kfree(key);
 710         kfree(datum);
 711         return 0;
 712 }
 713
 714 static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) =
 715 {
 716         common_destroy,
 717         cls_destroy,
 718         role_destroy,
 719         type_destroy,
 720         user_destroy,
 721         cond_destroy_bool,
 722         sens_destroy,
 723         cat_destroy,
 724 };
 725
 726 static int filenametr_destroy(void *key, void *datum, void *p)
 727 {
 728         struct filename_trans *ft = key;
 729         kfree(ft->name);
 730         kfree(key);
 731         kfree(datum);
 732         cond_resched();
 733         return 0;
 734 }
 735
 736 static int range_tr_destroy(void *key, void *datum, void *p)
 737 {
 738         struct mls_range *rt = datum;
 739         kfree(key);
 740         ebitmap_destroy(&rt->level[0].cat);
 741         ebitmap_destroy(&rt->level[1].cat);
 742         kfree(datum);
 743         cond_resched();
 744         return 0;
 745 }
 746
 747 static void ocontext_destroy(struct ocontext *c, int i)
 748 {
 749         if (!c)
 750                 return;
 751
 752         context_destroy(&c->context[0]);
 753         context_destroy(&c->context[1]);
 754         if (i == OCON_ISID || i == OCON_FS ||
 755             i == OCON_NETIF || i == OCON_FSUSE)
 756                 kfree(c->u.name);
 757         kfree(c);
 758 }
 759
 760 /*
 761  * Free any memory allocated by a policy database structure.
 762  */
 763 void policydb_destroy(struct policydb *p)
 764 {
 765         struct ocontext *c, *ctmp;
 766         struct genfs *g, *gtmp;
 767         int i;
 768         struct role_allow *ra, *lra = NULL;
 769         struct role_trans *tr, *ltr = NULL;
 770
 771         for (i = 0; i < SYM_NUM; i++) {
 772                 cond_resched();
 773                 hashtab_map(p->symtab[i].table, destroy_f[i], NULL);
 774                 hashtab_destroy(p->symtab[i].table);
 775         }
 776
 777         for (i = 0; i < SYM_NUM; i++) {
 778                 if (p->sym_val_to_name[i])
 779                         flex_array_free(p->sym_val_to_name[i]);
 780         }
 781
 782         kfree(p->class_val_to_struct);
 783         kfree(p->role_val_to_struct);
 784         kfree(p->user_val_to_struct);
 785         if (p->type_val_to_struct_array)
 786                 flex_array_free(p->type_val_to_struct_array);
 787
 788         avtab_destroy(&p->te_avtab);
 789
 790         for (i = 0; i < OCON_NUM; i++) {
 791                 cond_resched();
 792                 c = p->ocontexts[i];
 793                 while (c) {
 794                         ctmp = c;
 795                         c = c->next;
 796                         ocontext_destroy(ctmp, i);
 797                 }
 798                 p->ocontexts[i] = NULL;
 799         }
 800
 801         g = p->genfs;
 802         while (g) {
 803                 cond_resched();
 804                 kfree(g->fstype);
 805                 c = g->head;
 806                 while (c) {
 807                         ctmp = c;
 808                         c = c->next;
 809                         ocontext_destroy(ctmp, OCON_FSUSE);
 810                 }
 811                 gtmp = g;
 812                 g = g->next;
 813                 kfree(gtmp);
 814         }
 815         p->genfs = NULL;
 816
 817         cond_policydb_destroy(p);
 818
 819         for (tr = p->role_tr; tr; tr = tr->next) {
 820                 cond_resched();
 821                 kfree(ltr);
 822                 ltr = tr;
 823         }
 824         kfree(ltr);
 825
 826         for (ra = p->role_allow; ra; ra = ra->next) {
 827                 cond_resched();
 828                 kfree(lra);
 829                 lra = ra;
 830         }
 831         kfree(lra);
 832
 833         hashtab_map(p->filename_trans, filenametr_destroy, NULL);
 834         hashtab_destroy(p->filename_trans);
 835
 836         hashtab_map(p->range_tr, range_tr_destroy, NULL);
 837         hashtab_destroy(p->range_tr);
 838
 839         if (p->type_attr_map_array) {
 840                 for (i = 0; i < p->p_types.nprim; i++) {
 841                         struct ebitmap *e;
 842
 843                         e = flex_array_get(p->type_attr_map_array, i);
 844                         if (!e)
 845                                 continue;
 846                         ebitmap_destroy(e);
 847                 }
 848                 flex_array_free(p->type_attr_map_array);
 849         }
 850
 851         ebitmap_destroy(&p->filename_trans_ttypes);
 852         ebitmap_destroy(&p->policycaps);
 853         ebitmap_destroy(&p->permissive_map);
 854
 855         return;
 856 }
 857
 858 /*
 859  * Load the initial SIDs specified in a policy database
 860  * structure into a SID table.
 861  */
 862 int policydb_load_isids(struct policydb *p, struct sidtab *s)
 863 {
 864         struct ocontext *head, *c;
 865         int rc;
 866
 867         rc = sidtab_init(s);
 868         if (rc) {
 869                 printk(KERN_ERR "SELinux:  out of memory on SID table init\n");
 870                 goto out;
 871         }
 872
 873         head = p->ocontexts[OCON_ISID];
 874         for (c = head; c; c = c->next) {
 875                 rc = -EINVAL;
 876                 if (!c->context[0].user) {
 877                         printk(KERN_ERR "SELinux:  SID %s was never defined.\n",
 878                                 c->u.name);
 879                         goto out;
 880                 }
 881
 882                 rc = sidtab_insert(s, c->sid[0], &c->context[0]);
 883                 if (rc) {
 884                         printk(KERN_ERR "SELinux:  unable to load initial SID %s.\n",
 885                                 c->u.name);
 886                         goto out;
 887                 }
 888         }
 889         rc = 0;
 890 out:
 891         return rc;
 892 }
 893
 894 int policydb_class_isvalid(struct policydb *p, unsigned int class)
 895 {
 896         if (!class || class > p->p_classes.nprim)
 897                 return 0;
 898         return 1;
 899 }
 900
 901 int policydb_role_isvalid(struct policydb *p, unsigned int role)
 902 {
 903         if (!role || role > p->p_roles.nprim)
 904                 return 0;
 905         return 1;
 906 }
 907
 908 int policydb_type_isvalid(struct policydb *p, unsigned int type)
 909 {
 910         if (!type || type > p->p_types.nprim)
 911                 return 0;
 912         return 1;
 913 }
 914
 915 /*
 916  * Return 1 if the fields in the security context
 917  * structure `c' are valid.  Return 0 otherwise.
 918  */
 919 int policydb_context_isvalid(struct policydb *p, struct context *c)
 920 {
 921         struct role_datum *role;
 922         struct user_datum *usrdatum;
 923
 924         if (!c->role || c->role > p->p_roles.nprim)
 925                 return 0;
 926
 927         if (!c->user || c->user > p->p_users.nprim)
 928                 return 0;
 929
 930         if (!c->type || c->type > p->p_types.nprim)
 931                 return 0;
 932
 933         if (c->role != OBJECT_R_VAL) {
 934                 /*
 935                  * Role must be authorized for the type.
 936                  */
 937                 role = p->role_val_to_struct[c->role - 1];
 938                 if (!ebitmap_get_bit(&role->types, c->type - 1))
 939                         /* role may not be associated with type */
 940                         return 0;
 941
 942                 /*
 943                  * User must be authorized for the role.
 944                  */
 945                 usrdatum = p->user_val_to_struct[c->user - 1];
 946                 if (!usrdatum)
 947                         return 0;
 948
 949                 if (!ebitmap_get_bit(&usrdatum->roles, c->role - 1))
 950                         /* user may not be associated with role */
 951                         return 0;
 952         }
 953
 954         if (!mls_context_isvalid(p, c))
 955                 return 0;
 956
 957         return 1;
 958 }
 959
 960 /*
 961  * Read a MLS range structure from a policydb binary
 962  * representation file.
 963  */
 964 static int mls_read_range_helper(struct mls_range *r, void *fp)
 965 {
 966         __le32 buf[2];
 967         u32 items;
 968         int rc;
 969
 970         rc = next_entry(buf, fp, sizeof(u32));
 971         if (rc)
 972                 goto out;
 973
 974         rc = -EINVAL;
 975         items = le32_to_cpu(buf[0]);
 976         if (items > ARRAY_SIZE(buf)) {
 977                 printk(KERN_ERR "SELinux: mls:  range overflow\n");
 978                 goto out;
 979         }
 980
 981         rc = next_entry(buf, fp, sizeof(u32) * items);
 982         if (rc) {
 983                 printk(KERN_ERR "SELinux: mls:  truncated range\n");
 984                 goto out;
 985         }
 986
 987         r->level[0].sens = le32_to_cpu(buf[0]);
 988         if (items > 1)
 989                 r->level[1].sens = le32_to_cpu(buf[1]);
 990         else
 991                 r->level[1].sens = r->level[0].sens;
 992
 993         rc = ebitmap_read(&r->level[0].cat, fp);
 994         if (rc) {
 995                 printk(KERN_ERR "SELinux: mls:  error reading low categories\n");
 996                 goto out;
 997         }
 998         if (items > 1) {
 999                 rc = ebitmap_read(&r->level[1].cat, fp);
1000                 if (rc) {
1001                         printk(KERN_ERR "SELinux: mls:  error reading high categories\n");
1002                         goto bad_high;
1003                 }
1004         } else {
1005                 rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat);
1006                 if (rc) {
1007                         printk(KERN_ERR "SELinux: mls:  out of memory\n");
1008                         goto bad_high;
1009                 }
1010         }
1011
1012         return 0;
1013 bad_high:
1014         ebitmap_destroy(&r->level[0].cat);
1015 out:
1016         return rc;
1017 }
1018
1019 /*
1020  * Read and validate a security context structure
1021  * from a policydb binary representation file.
1022  */
1023 static int context_read_and_validate(struct context *c,
1024                                      struct policydb *p,
1025                                      void *fp)
1026 {
1027         __le32 buf[3];
1028         int rc;
1029
1030         rc = next_entry(buf, fp, sizeof buf);
1031         if (rc) {
1032                 printk(KERN_ERR "SELinux: context truncated\n");
1033                 goto out;
1034         }
1035         c->user = le32_to_cpu(buf[0]);
1036         c->role = le32_to_cpu(buf[1]);
1037         c->type = le32_to_cpu(buf[2]);
1038         if (p->policyvers >= POLICYDB_VERSION_MLS) {
1039                 rc = mls_read_range_helper(&c->range, fp);
1040                 if (rc) {
1041                         printk(KERN_ERR "SELinux: error reading MLS range of context\n");
1042                         goto out;
1043                 }
1044         }
1045
1046         rc = -EINVAL;
1047         if (!policydb_context_isvalid(p, c)) {
1048                 printk(KERN_ERR "SELinux:  invalid security context\n");
1049                 context_destroy(c);
1050                 goto out;
1051         }
1052         rc = 0;
1053 out:
1054         return rc;
1055 }
1056
1057 /*
1058  * The following *_read functions are used to
1059  * read the symbol data from a policy database
1060  * binary representation file.
1061  */
1062
1063 static int perm_read(struct policydb *p, struct hashtab *h, void *fp)
1064 {
1065         char *key = NULL;
1066         struct perm_datum *perdatum;
1067         int rc;
1068         __le32 buf[2];
1069         u32 len;
1070
1071         rc = -ENOMEM;
1072         perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
1073         if (!perdatum)
1074                 goto bad;
1075
1076         rc = next_entry(buf, fp, sizeof buf);
1077         if (rc)
1078                 goto bad;
1079
1080         len = le32_to_cpu(buf[0]);
1081         perdatum->value = le32_to_cpu(buf[1]);
1082
1083         rc = -ENOMEM;
1084         key = kmalloc(len + 1, GFP_KERNEL);
1085         if (!key)
1086                 goto bad;
1087
1088         rc = next_entry(key, fp, len);
1089         if (rc)
1090                 goto bad;
1091         key[len] = '\0';
1092
1093         rc = hashtab_insert(h, key, perdatum);
1094         if (rc)
1095                 goto bad;
1096
1097         return 0;
1098 bad:
1099         perm_destroy(key, perdatum, NULL);
1100         return rc;
1101 }
1102
1103 static int common_read(struct policydb *p, struct hashtab *h, void *fp)
1104 {
1105         char *key = NULL;
1106         struct common_datum *comdatum;
1107         __le32 buf[4];
1108         u32 len, nel;
1109         int i, rc;
1110
1111         rc = -ENOMEM;
1112         comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
1113         if (!comdatum)
1114                 goto bad;
1115
1116         rc = next_entry(buf, fp, sizeof buf);
1117         if (rc)
1118                 goto bad;
1119
1120         len = le32_to_cpu(buf[0]);
1121         comdatum->value = le32_to_cpu(buf[1]);
1122
1123         rc = symtab_init(&comdatum->permissions, PERM_SYMTAB_SIZE);
1124         if (rc)
1125                 goto bad;
1126         comdatum->permissions.nprim = le32_to_cpu(buf[2]);
1127         nel = le32_to_cpu(buf[3]);
1128
1129         rc = -ENOMEM;
1130         key = kmalloc(len + 1, GFP_KERNEL);
1131         if (!key)
1132                 goto bad;
1133
1134         rc = next_entry(key, fp, len);
1135         if (rc)
1136                 goto bad;
1137         key[len] = '\0';
1138
1139         for (i = 0; i < nel; i++) {
1140                 rc = perm_read(p, comdatum->permissions.table, fp);
1141                 if (rc)
1142                         goto bad;
1143         }
1144
1145         rc = hashtab_insert(h, key, comdatum);
1146         if (rc)
1147                 goto bad;
1148         return 0;
1149 bad:
1150         common_destroy(key, comdatum, NULL);
1151         return rc;
1152 }
1153
1154 static int read_cons_helper(struct constraint_node **nodep, int ncons,
1155                             int allowxtarget, void *fp)
1156 {
1157         struct constraint_node *c, *lc;
1158         struct constraint_expr *e, *le;
1159         __le32 buf[3];
1160         u32 nexpr;
1161         int rc, i, j, depth;
1162
1163         lc = NULL;
1164         for (i = 0; i < ncons; i++) {
1165                 c = kzalloc(sizeof(*c), GFP_KERNEL);
1166                 if (!c)
1167                         return -ENOMEM;
1168
1169                 if (lc)
1170                         lc->next = c;
1171                 else
1172                         *nodep = c;
1173
1174                 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1175                 if (rc)
1176                         return rc;
1177                 c->permissions = le32_to_cpu(buf[0]);
1178                 nexpr = le32_to_cpu(buf[1]);
1179                 le = NULL;
1180                 depth = -1;
1181                 for (j = 0; j < nexpr; j++) {
1182                         e = kzalloc(sizeof(*e), GFP_KERNEL);
1183                         if (!e)
1184                                 return -ENOMEM;
1185
1186                         if (le)
1187                                 le->next = e;
1188                         else
1189                                 c->expr = e;
1190
1191                         rc = next_entry(buf, fp, (sizeof(u32) * 3));
1192                         if (rc)
1193                                 return rc;
1194                         e->expr_type = le32_to_cpu(buf[0]);
1195                         e->attr = le32_to_cpu(buf[1]);
1196                         e->op = le32_to_cpu(buf[2]);
1197
1198                         switch (e->expr_type) {
1199                         case CEXPR_NOT:
1200                                 if (depth < 0)
1201                                         return -EINVAL;
1202                                 break;
1203                         case CEXPR_AND:
1204                         case CEXPR_OR:
1205                                 if (depth < 1)
1206                                         return -EINVAL;
1207                                 depth--;
1208                                 break;
1209                         case CEXPR_ATTR:
1210                                 if (depth == (CEXPR_MAXDEPTH - 1))
1211                                         return -EINVAL;
1212                                 depth++;
1213                                 break;
1214                         case CEXPR_NAMES:
1215                                 if (!allowxtarget && (e->attr & CEXPR_XTARGET))
1216                                         return -EINVAL;
1217                                 if (depth == (CEXPR_MAXDEPTH - 1))
1218                                         return -EINVAL;
1219                                 depth++;
1220                                 rc = ebitmap_read(&e->names, fp);
1221                                 if (rc)
1222                                         return rc;
1223                                 break;
1224                         default:
1225                                 return -EINVAL;
1226                         }
1227                         le = e;
1228                 }
1229                 if (depth != 0)
1230                         return -EINVAL;
1231                 lc = c;
1232         }
1233
1234         return 0;
1235 }
1236
1237 static int class_read(struct policydb *p, struct hashtab *h, void *fp)
1238 {
1239         char *key = NULL;
1240         struct class_datum *cladatum;
1241         __le32 buf[6];
1242         u32 len, len2, ncons, nel;
1243         int i, rc;
1244
1245         rc = -ENOMEM;
1246         cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
1247         if (!cladatum)
1248                 goto bad;
1249
1250         rc = next_entry(buf, fp, sizeof(u32)*6);
1251         if (rc)
1252                 goto bad;
1253
1254         len = le32_to_cpu(buf[0]);
1255         len2 = le32_to_cpu(buf[1]);
1256         cladatum->value = le32_to_cpu(buf[2]);
1257
1258         rc = symtab_init(&cladatum->permissions, PERM_SYMTAB_SIZE);
1259         if (rc)
1260                 goto bad;
1261         cladatum->permissions.nprim = le32_to_cpu(buf[3]);
1262         nel = le32_to_cpu(buf[4]);
1263
1264         ncons = le32_to_cpu(buf[5]);
1265
1266         rc = -ENOMEM;
1267         key = kmalloc(len + 1, GFP_KERNEL);
1268         if (!key)
1269                 goto bad;
1270
1271         rc = next_entry(key, fp, len);
1272         if (rc)
1273                 goto bad;
1274         key[len] = '\0';
1275
1276         if (len2) {
1277                 rc = -ENOMEM;
1278                 cladatum->comkey = kmalloc(len2 + 1, GFP_KERNEL);
1279                 if (!cladatum->comkey)
1280                         goto bad;
1281                 rc = next_entry(cladatum->comkey, fp, len2);
1282                 if (rc)
1283                         goto bad;
1284                 cladatum->comkey[len2] = '\0';
1285
1286                 rc = -EINVAL;
1287                 cladatum->comdatum = hashtab_search(p->p_commons.table, cladatum->comkey);
1288                 if (!cladatum->comdatum) {
1289                         printk(KERN_ERR "SELinux:  unknown common %s\n", cladatum->comkey);
1290                         goto bad;
1291                 }
1292         }
1293         for (i = 0; i < nel; i++) {
1294                 rc = perm_read(p, cladatum->permissions.table, fp);
1295                 if (rc)
1296                         goto bad;
1297         }
1298
1299         rc = read_cons_helper(&cladatum->constraints, ncons, 0, fp);
1300         if (rc)
1301                 goto bad;
1302
1303         if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
1304                 /* grab the validatetrans rules */
1305                 rc = next_entry(buf, fp, sizeof(u32));
1306                 if (rc)
1307                         goto bad;
1308                 ncons = le32_to_cpu(buf[0]);
1309                 rc = read_cons_helper(&cladatum->validatetrans, ncons, 1, fp);
1310                 if (rc)
1311                         goto bad;
1312         }
1313
1314         if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
1315                 rc = next_entry(buf, fp, sizeof(u32) * 3);
1316                 if (rc)
1317                         goto bad;
1318
1319                 cladatum->default_user = le32_to_cpu(buf[0]);
1320                 cladatum->default_role = le32_to_cpu(buf[1]);
1321                 cladatum->default_range = le32_to_cpu(buf[2]);
1322         }
1323
1324         rc = hashtab_insert(h, key, cladatum);
1325         if (rc)
1326                 goto bad;
1327
1328         return 0;
1329 bad:
1330         cls_destroy(key, cladatum, NULL);
1331         return rc;
1332 }
1333
1334 static int role_read(struct policydb *p, struct hashtab *h, void *fp)
1335 {
1336         char *key = NULL;
1337         struct role_datum *role;
1338         int rc, to_read = 2;
1339         __le32 buf[3];
1340         u32 len;
1341
1342         rc = -ENOMEM;
1343         role = kzalloc(sizeof(*role), GFP_KERNEL);
1344         if (!role)
1345                 goto bad;
1346
1347         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1348                 to_read = 3;
1349
1350         rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1351         if (rc)
1352                 goto bad;
1353
1354         len = le32_to_cpu(buf[0]);
1355         role->value = le32_to_cpu(buf[1]);
1356         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1357                 role->bounds = le32_to_cpu(buf[2]);
1358
1359         rc = -ENOMEM;
1360         key = kmalloc(len + 1, GFP_KERNEL);
1361         if (!key)
1362                 goto bad;
1363
1364         rc = next_entry(key, fp, len);
1365         if (rc)
1366                 goto bad;
1367         key[len] = '\0';
1368
1369         rc = ebitmap_read(&role->dominates, fp);
1370         if (rc)
1371                 goto bad;
1372
1373         rc = ebitmap_read(&role->types, fp);
1374         if (rc)
1375                 goto bad;
1376
1377         if (strcmp(key, OBJECT_R) == 0) {
1378                 rc = -EINVAL;
1379                 if (role->value != OBJECT_R_VAL) {
1380                         printk(KERN_ERR "SELinux: Role %s has wrong value %d\n",
1381                                OBJECT_R, role->value);
1382                         goto bad;
1383                 }
1384                 rc = 0;
1385                 goto bad;
1386         }
1387
1388         rc = hashtab_insert(h, key, role);
1389         if (rc)
1390                 goto bad;
1391         return 0;
1392 bad:
1393         role_destroy(key, role, NULL);
1394         return rc;
1395 }
1396
1397 static int type_read(struct policydb *p, struct hashtab *h, void *fp)
1398 {
1399         char *key = NULL;
1400         struct type_datum *typdatum;
1401         int rc, to_read = 3;
1402         __le32 buf[4];
1403         u32 len;
1404
1405         rc = -ENOMEM;
1406         typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL);
1407         if (!typdatum)
1408                 goto bad;
1409
1410         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1411                 to_read = 4;
1412
1413         rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1414         if (rc)
1415                 goto bad;
1416
1417         len = le32_to_cpu(buf[0]);
1418         typdatum->value = le32_to_cpu(buf[1]);
1419         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
1420                 u32 prop = le32_to_cpu(buf[2]);
1421
1422                 if (prop & TYPEDATUM_PROPERTY_PRIMARY)
1423                         typdatum->primary = 1;
1424                 if (prop & TYPEDATUM_PROPERTY_ATTRIBUTE)
1425                         typdatum->attribute = 1;
1426
1427                 typdatum->bounds = le32_to_cpu(buf[3]);
1428         } else {
1429                 typdatum->primary = le32_to_cpu(buf[2]);
1430         }
1431
1432         rc = -ENOMEM;
1433         key = kmalloc(len + 1, GFP_KERNEL);
1434         if (!key)
1435                 goto bad;
1436         rc = next_entry(key, fp, len);
1437         if (rc)
1438                 goto bad;
1439         key[len] = '\0';
1440
1441         rc = hashtab_insert(h, key, typdatum);
1442         if (rc)
1443                 goto bad;
1444         return 0;
1445 bad:
1446         type_destroy(key, typdatum, NULL);
1447         return rc;
1448 }
1449
1450
1451 /*
1452  * Read a MLS level structure from a policydb binary
1453  * representation file.
1454  */
1455 static int mls_read_level(struct mls_level *lp, void *fp)
1456 {
1457         __le32 buf[1];
1458         int rc;
1459
1460         memset(lp, 0, sizeof(*lp));
1461
1462         rc = next_entry(buf, fp, sizeof buf);
1463         if (rc) {
1464                 printk(KERN_ERR "SELinux: mls: truncated level\n");
1465                 return rc;
1466         }
1467         lp->sens = le32_to_cpu(buf[0]);
1468
1469         rc = ebitmap_read(&lp->cat, fp);
1470         if (rc) {
1471                 printk(KERN_ERR "SELinux: mls:  error reading level categories\n");
1472                 return rc;
1473         }
1474         return 0;
1475 }
1476
1477 static int user_read(struct policydb *p, struct hashtab *h, void *fp)
1478 {
1479         char *key = NULL;
1480         struct user_datum *usrdatum;
1481         int rc, to_read = 2;
1482         __le32 buf[3];
1483         u32 len;
1484
1485         rc = -ENOMEM;
1486         usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
1487         if (!usrdatum)
1488                 goto bad;
1489
1490         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1491                 to_read = 3;
1492
1493         rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1494         if (rc)
1495                 goto bad;
1496
1497         len = le32_to_cpu(buf[0]);
1498         usrdatum->value = le32_to_cpu(buf[1]);
1499         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1500                 usrdatum->bounds = le32_to_cpu(buf[2]);
1501
1502         rc = -ENOMEM;
1503         key = kmalloc(len + 1, GFP_KERNEL);
1504         if (!key)
1505                 goto bad;
1506         rc = next_entry(key, fp, len);
1507         if (rc)
1508                 goto bad;
1509         key[len] = '\0';
1510
1511         rc = ebitmap_read(&usrdatum->roles, fp);
1512         if (rc)
1513                 goto bad;
1514
1515         if (p->policyvers >= POLICYDB_VERSION_MLS) {
1516                 rc = mls_read_range_helper(&usrdatum->range, fp);
1517                 if (rc)
1518                         goto bad;
1519                 rc = mls_read_level(&usrdatum->dfltlevel, fp);
1520                 if (rc)
1521                         goto bad;
1522         }
1523
1524         rc = hashtab_insert(h, key, usrdatum);
1525         if (rc)
1526                 goto bad;
1527         return 0;
1528 bad:
1529         user_destroy(key, usrdatum, NULL);
1530         return rc;
1531 }
1532
1533 static int sens_read(struct policydb *p, struct hashtab *h, void *fp)
1534 {
1535         char *key = NULL;
1536         struct level_datum *levdatum;
1537         int rc;
1538         __le32 buf[2];
1539         u32 len;
1540
1541         rc = -ENOMEM;
1542         levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC);
1543         if (!levdatum)
1544                 goto bad;
1545
1546         rc = next_entry(buf, fp, sizeof buf);
1547         if (rc)
1548                 goto bad;
1549
1550         len = le32_to_cpu(buf[0]);
1551         levdatum->isalias = le32_to_cpu(buf[1]);
1552
1553         rc = -ENOMEM;
1554         key = kmalloc(len + 1, GFP_ATOMIC);
1555         if (!key)
1556                 goto bad;
1557         rc = next_entry(key, fp, len);
1558         if (rc)
1559                 goto bad;
1560         key[len] = '\0';
1561
1562         rc = -ENOMEM;
1563         levdatum->level = kmalloc(sizeof(struct mls_level), GFP_ATOMIC);
1564         if (!levdatum->level)
1565                 goto bad;
1566
1567         rc = mls_read_level(levdatum->level, fp);
1568         if (rc)
1569                 goto bad;
1570
1571         rc = hashtab_insert(h, key, levdatum);
1572         if (rc)
1573                 goto bad;
1574         return 0;
1575 bad:
1576         sens_destroy(key, levdatum, NULL);
1577         return rc;
1578 }
1579
1580 static int cat_read(struct policydb *p, struct hashtab *h, void *fp)
1581 {
1582         char *key = NULL;
1583         struct cat_datum *catdatum;
1584         int rc;
1585         __le32 buf[3];
1586         u32 len;
1587
1588         rc = -ENOMEM;
1589         catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC);
1590         if (!catdatum)
1591                 goto bad;
1592
1593         rc = next_entry(buf, fp, sizeof buf);
1594         if (rc)
1595                 goto bad;
1596
1597         len = le32_to_cpu(buf[0]);
1598         catdatum->value = le32_to_cpu(buf[1]);
1599         catdatum->isalias = le32_to_cpu(buf[2]);
1600
1601         rc = -ENOMEM;
1602         key = kmalloc(len + 1, GFP_ATOMIC);
1603         if (!key)
1604                 goto bad;
1605         rc = next_entry(key, fp, len);
1606         if (rc)
1607                 goto bad;
1608         key[len] = '\0';
1609
1610         rc = hashtab_insert(h, key, catdatum);
1611         if (rc)
1612                 goto bad;
1613         return 0;
1614 bad:
1615         cat_destroy(key, catdatum, NULL);
1616         return rc;
1617 }
1618
1619 static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, void *fp) =
1620 {
1621         common_read,
1622         class_read,
1623         role_read,
1624         type_read,
1625         user_read,
1626         cond_read_bool,
1627         sens_read,
1628         cat_read,
1629 };
1630
1631 static int user_bounds_sanity_check(void *key, void *datum, void *datap)
1632 {
1633         struct user_datum *upper, *user;
1634         struct policydb *p = datap;
1635         int depth = 0;
1636
1637         upper = user = datum;
1638         while (upper->bounds) {
1639                 struct ebitmap_node *node;
1640                 unsigned long bit;
1641
1642                 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1643                         printk(KERN_ERR "SELinux: user %s: "
1644                                "too deep or looped boundary",
1645                                (char *) key);
1646                         return -EINVAL;
1647                 }
1648
1649                 upper = p->user_val_to_struct[upper->bounds - 1];
1650                 ebitmap_for_each_positive_bit(&user->roles, node, bit) {
1651                         if (ebitmap_get_bit(&upper->roles, bit))
1652                                 continue;
1653
1654                         printk(KERN_ERR
1655                                "SELinux: boundary violated policy: "
1656                                "user=%s role=%s bounds=%s\n",
1657                                sym_name(p, SYM_USERS, user->value - 1),
1658                                sym_name(p, SYM_ROLES, bit),
1659                                sym_name(p, SYM_USERS, upper->value - 1));
1660
1661                         return -EINVAL;
1662                 }
1663         }
1664
1665         return 0;
1666 }
1667
1668 static int role_bounds_sanity_check(void *key, void *datum, void *datap)
1669 {
1670         struct role_datum *upper, *role;
1671         struct policydb *p = datap;
1672         int depth = 0;
1673
1674         upper = role = datum;
1675         while (upper->bounds) {
1676                 struct ebitmap_node *node;
1677                 unsigned long bit;
1678
1679                 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1680                         printk(KERN_ERR "SELinux: role %s: "
1681                                "too deep or looped bounds\n",
1682                                (char *) key);
1683                         return -EINVAL;
1684                 }
1685
1686                 upper = p->role_val_to_struct[upper->bounds - 1];
1687                 ebitmap_for_each_positive_bit(&role->types, node, bit) {
1688                         if (ebitmap_get_bit(&upper->types, bit))
1689                                 continue;
1690
1691                         printk(KERN_ERR
1692                                "SELinux: boundary violated policy: "
1693                                "role=%s type=%s bounds=%s\n",
1694                                sym_name(p, SYM_ROLES, role->value - 1),
1695                                sym_name(p, SYM_TYPES, bit),
1696                                sym_name(p, SYM_ROLES, upper->value - 1));
1697
1698                         return -EINVAL;
1699                 }
1700         }
1701
1702         return 0;
1703 }
1704
1705 static int type_bounds_sanity_check(void *key, void *datum, void *datap)
1706 {
1707         struct type_datum *upper;
1708         struct policydb *p = datap;
1709         int depth = 0;
1710
1711         upper = datum;
1712         while (upper->bounds) {
1713                 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1714                         printk(KERN_ERR "SELinux: type %s: "
1715                                "too deep or looped boundary\n",
1716                                (char *) key);
1717                         return -EINVAL;
1718                 }
1719
1720                 upper = flex_array_get_ptr(p->type_val_to_struct_array,
1721                                            upper->bounds - 1);
1722                 BUG_ON(!upper);
1723
1724                 if (upper->attribute) {
1725                         printk(KERN_ERR "SELinux: type %s: "
1726                                "bounded by attribute %s",
1727                                (char *) key,
1728                                sym_name(p, SYM_TYPES, upper->value - 1));
1729                         return -EINVAL;
1730                 }
1731         }
1732
1733         return 0;
1734 }
1735
1736 static int policydb_bounds_sanity_check(struct policydb *p)
1737 {
1738         int rc;
1739
1740         if (p->policyvers < POLICYDB_VERSION_BOUNDARY)
1741                 return 0;
1742
1743         rc = hashtab_map(p->p_users.table,
1744                          user_bounds_sanity_check, p);
1745         if (rc)
1746                 return rc;
1747
1748         rc = hashtab_map(p->p_roles.table,
1749                          role_bounds_sanity_check, p);
1750         if (rc)
1751                 return rc;
1752
1753         rc = hashtab_map(p->p_types.table,
1754                          type_bounds_sanity_check, p);
1755         if (rc)
1756                 return rc;
1757
1758         return 0;
1759 }
1760
1761 u16 string_to_security_class(struct policydb *p, const char *name)
1762 {
1763         struct class_datum *cladatum;
1764
1765         cladatum = hashtab_search(p->p_classes.table, name);
1766         if (!cladatum)
1767                 return 0;
1768
1769         return cladatum->value;
1770 }
1771
1772 u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name)
1773 {
1774         struct class_datum *cladatum;
1775         struct perm_datum *perdatum = NULL;
1776         struct common_datum *comdatum;
1777
1778         if (!tclass || tclass > p->p_classes.nprim)
1779                 return 0;
1780
1781         cladatum = p->class_val_to_struct[tclass-1];
1782         comdatum = cladatum->comdatum;
1783         if (comdatum)
1784                 perdatum = hashtab_search(comdatum->permissions.table,
1785                                           name);
1786         if (!perdatum)
1787                 perdatum = hashtab_search(cladatum->permissions.table,
1788                                           name);
1789         if (!perdatum)
1790                 return 0;
1791
1792         return 1U << (perdatum->value-1);
1793 }
1794
1795 static int range_read(struct policydb *p, void *fp)
1796 {
1797         struct range_trans *rt = NULL;
1798         struct mls_range *r = NULL;
1799         int i, rc;
1800         __le32 buf[2];
1801         u32 nel;
1802
1803         if (p->policyvers < POLICYDB_VERSION_MLS)
1804                 return 0;
1805
1806         rc = next_entry(buf, fp, sizeof(u32));
1807         if (rc)
1808                 goto out;
1809
1810         nel = le32_to_cpu(buf[0]);
1811         for (i = 0; i < nel; i++) {
1812                 rc = -ENOMEM;
1813                 rt = kzalloc(sizeof(*rt), GFP_KERNEL);
1814                 if (!rt)
1815                         goto out;
1816
1817                 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1818                 if (rc)
1819                         goto out;
1820
1821                 rt->source_type = le32_to_cpu(buf[0]);
1822                 rt->target_type = le32_to_cpu(buf[1]);
1823                 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
1824                         rc = next_entry(buf, fp, sizeof(u32));
1825                         if (rc)
1826                                 goto out;
1827                         rt->target_class = le32_to_cpu(buf[0]);
1828                 } else
1829                         rt->target_class = p->process_class;
1830
1831                 rc = -EINVAL;
1832                 if (!policydb_type_isvalid(p, rt->source_type) ||
1833                     !policydb_type_isvalid(p, rt->target_type) ||
1834                     !policydb_class_isvalid(p, rt->target_class))
1835                         goto out;
1836
1837                 rc = -ENOMEM;
1838                 r = kzalloc(sizeof(*r), GFP_KERNEL);
1839                 if (!r)
1840                         goto out;
1841
1842                 rc = mls_read_range_helper(r, fp);
1843                 if (rc)
1844                         goto out;
1845
1846                 rc = -EINVAL;
1847                 if (!mls_range_isvalid(p, r)) {
1848                         printk(KERN_WARNING "SELinux:  rangetrans:  invalid range\n");
1849                         goto out;
1850                 }
1851
1852                 rc = hashtab_insert(p->range_tr, rt, r);
1853                 if (rc)
1854                         goto out;
1855
1856                 rt = NULL;
1857                 r = NULL;
1858         }
1859         hash_eval(p->range_tr, "rangetr");
1860         rc = 0;
1861 out:
1862         kfree(rt);
1863         kfree(r);
1864         return rc;
1865 }
1866
1867 static int filename_trans_read(struct policydb *p, void *fp)
1868 {
1869         struct filename_trans *ft;
1870         struct filename_trans_datum *otype;
1871         char *name;
1872         u32 nel, len;
1873         __le32 buf[4];
1874         int rc, i;
1875
1876         if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
1877                 return 0;
1878
1879         rc = next_entry(buf, fp, sizeof(u32));
1880         if (rc)
1881                 return rc;
1882         nel = le32_to_cpu(buf[0]);
1883
1884         for (i = 0; i < nel; i++) {
1885                 ft = NULL;
1886                 otype = NULL;
1887                 name = NULL;
1888
1889                 rc = -ENOMEM;
1890                 ft = kzalloc(sizeof(*ft), GFP_KERNEL);
1891                 if (!ft)
1892                         goto out;
1893
1894                 rc = -ENOMEM;
1895                 otype = kmalloc(sizeof(*otype), GFP_KERNEL);
1896                 if (!otype)
1897                         goto out;
1898
1899                 /* length of the path component string */
1900                 rc = next_entry(buf, fp, sizeof(u32));
1901                 if (rc)
1902                         goto out;
1903                 len = le32_to_cpu(buf[0]);
1904
1905                 rc = -ENOMEM;
1906                 name = kmalloc(len + 1, GFP_KERNEL);
1907                 if (!name)
1908                         goto out;
1909
1910                 ft->name = name;
1911
1912                 /* path component string */
1913                 rc = next_entry(name, fp, len);
1914                 if (rc)
1915                         goto out;
1916                 name[len] = 0;
1917
1918                 rc = next_entry(buf, fp, sizeof(u32) * 4);
1919                 if (rc)
1920                         goto out;
1921
1922                 ft->stype = le32_to_cpu(buf[0]);
1923                 ft->ttype = le32_to_cpu(buf[1]);
1924                 ft->tclass = le32_to_cpu(buf[2]);
1925
1926                 otype->otype = le32_to_cpu(buf[3]);
1927
1928                 rc = ebitmap_set_bit(&p->filename_trans_ttypes, ft->ttype, 1);
1929                 if (rc)
1930                         goto out;
1931
1932                 hashtab_insert(p->filename_trans, ft, otype);
1933         }
1934         hash_eval(p->filename_trans, "filenametr");
1935         return 0;
1936 out:
1937         kfree(ft);
1938         kfree(name);
1939         kfree(otype);
1940
1941         return rc;
1942 }
1943
1944 static int genfs_read(struct policydb *p, void *fp)
1945 {
1946         int i, j, rc;
1947         u32 nel, nel2, len, len2;
1948         __le32 buf[1];
1949         struct ocontext *l, *c;
1950         struct ocontext *newc = NULL;
1951         struct genfs *genfs_p, *genfs;
1952         struct genfs *newgenfs = NULL;
1953
1954         rc = next_entry(buf, fp, sizeof(u32));
1955         if (rc)
1956                 goto out;
1957         nel = le32_to_cpu(buf[0]);
1958
1959         for (i = 0; i < nel; i++) {
1960                 rc = next_entry(buf, fp, sizeof(u32));
1961                 if (rc)
1962                         goto out;
1963                 len = le32_to_cpu(buf[0]);
1964
1965                 rc = -ENOMEM;
1966                 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
1967                 if (!newgenfs)
1968                         goto out;
1969
1970                 rc = -ENOMEM;
1971                 newgenfs->fstype = kmalloc(len + 1, GFP_KERNEL);
1972                 if (!newgenfs->fstype)
1973                         goto out;
1974
1975                 rc = next_entry(newgenfs->fstype, fp, len);
1976                 if (rc)
1977                         goto out;
1978
1979                 newgenfs->fstype[len] = 0;
1980
1981                 for (genfs_p = NULL, genfs = p->genfs; genfs;
1982                      genfs_p = genfs, genfs = genfs->next) {
1983                         rc = -EINVAL;
1984                         if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
1985                                 printk(KERN_ERR "SELinux:  dup genfs fstype %s\n",
1986                                        newgenfs->fstype);
1987                                 goto out;
1988                         }
1989                         if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
1990                                 break;
1991                 }
1992                 newgenfs->next = genfs;
1993                 if (genfs_p)
1994                         genfs_p->next = newgenfs;
1995                 else
1996                         p->genfs = newgenfs;
1997                 genfs = newgenfs;
1998                 newgenfs = NULL;
1999
2000                 rc = next_entry(buf, fp, sizeof(u32));
2001                 if (rc)
2002                         goto out;
2003
2004                 nel2 = le32_to_cpu(buf[0]);
2005                 for (j = 0; j < nel2; j++) {
2006                         rc = next_entry(buf, fp, sizeof(u32));
2007                         if (rc)
2008                                 goto out;
2009                         len = le32_to_cpu(buf[0]);
2010
2011                         rc = -ENOMEM;
2012                         newc = kzalloc(sizeof(*newc), GFP_KERNEL);
2013                         if (!newc)
2014                                 goto out;
2015
2016                         rc = -ENOMEM;
2017                         newc->u.name = kmalloc(len + 1, GFP_KERNEL);
2018                         if (!newc->u.name)
2019                                 goto out;
2020
2021                         rc = next_entry(newc->u.name, fp, len);
2022                         if (rc)
2023                                 goto out;
2024                         newc->u.name[len] = 0;
2025
2026                         rc = next_entry(buf, fp, sizeof(u32));
2027                         if (rc)
2028                                 goto out;
2029
2030                         newc->v.sclass = le32_to_cpu(buf[0]);
2031                         rc = context_read_and_validate(&newc->context[0], p, fp);
2032                         if (rc)
2033                                 goto out;
2034
2035                         for (l = NULL, c = genfs->head; c;
2036                              l = c, c = c->next) {
2037                                 rc = -EINVAL;
2038                                 if (!strcmp(newc->u.name, c->u.name) &&
2039                                     (!c->v.sclass || !newc->v.sclass ||
2040                                      newc->v.sclass == c->v.sclass)) {
2041                                         printk(KERN_ERR "SELinux:  dup genfs entry (%s,%s)\n",
2042                                                genfs->fstype, c->u.name);
2043                                         goto out;
2044                                 }
2045                                 len = strlen(newc->u.name);
2046                                 len2 = strlen(c->u.name);
2047                                 if (len > len2)
2048                                         break;
2049                         }
2050
2051                         newc->next = c;
2052                         if (l)
2053                                 l->next = newc;
2054                         else
2055                                 genfs->head = newc;
2056                         newc = NULL;
2057                 }
2058         }
2059         rc = 0;
2060 out:
2061         if (newgenfs)
2062                 kfree(newgenfs->fstype);
2063         kfree(newgenfs);
2064         ocontext_destroy(newc, OCON_FSUSE);
2065
2066         return rc;
2067 }
2068
2069 static int ocontext_read(struct policydb *p, struct policydb_compat_info *info,
2070                          void *fp)
2071 {
2072         int i, j, rc;
2073         u32 nel, len;
2074         __le32 buf[3];
2075         struct ocontext *l, *c;
2076         u32 nodebuf[8];
2077
2078         for (i = 0; i < info->ocon_num; i++) {
2079                 rc = next_entry(buf, fp, sizeof(u32));
2080                 if (rc)
2081                         goto out;
2082                 nel = le32_to_cpu(buf[0]);
2083
2084                 l = NULL;
2085                 for (j = 0; j < nel; j++) {
2086                         rc = -ENOMEM;
2087                         c = kzalloc(sizeof(*c), GFP_KERNEL);
2088                         if (!c)
2089                                 goto out;
2090                         if (l)
2091                                 l->next = c;
2092                         else
2093                                 p->ocontexts[i] = c;
2094                         l = c;
2095
2096                         switch (i) {
2097                         case OCON_ISID:
2098                                 rc = next_entry(buf, fp, sizeof(u32));
2099                                 if (rc)
2100                                         goto out;
2101
2102                                 c->sid[0] = le32_to_cpu(buf[0]);
2103                                 rc = context_read_and_validate(&c->context[0], p, fp);
2104                                 if (rc)
2105                                         goto out;
2106                                 break;
2107                         case OCON_FS:
2108                         case OCON_NETIF:
2109                                 rc = next_entry(buf, fp, sizeof(u32));
2110                                 if (rc)
2111                                         goto out;
2112                                 len = le32_to_cpu(buf[0]);
2113
2114                                 rc = -ENOMEM;
2115                                 c->u.name = kmalloc(len + 1, GFP_KERNEL);
2116                                 if (!c->u.name)
2117                                         goto out;
2118
2119                                 rc = next_entry(c->u.name, fp, len);
2120                                 if (rc)
2121                                         goto out;
2122
2123                                 c->u.name[len] = 0;
2124                                 rc = context_read_and_validate(&c->context[0], p, fp);
2125                                 if (rc)
2126                                         goto out;
2127                                 rc = context_read_and_validate(&c->context[1], p, fp);
2128                                 if (rc)
2129                                         goto out;
2130                                 break;
2131                         case OCON_PORT:
2132                                 rc = next_entry(buf, fp, sizeof(u32)*3);
2133                                 if (rc)
2134                                         goto out;
2135                                 c->u.port.protocol = le32_to_cpu(buf[0]);
2136                                 c->u.port.low_port = le32_to_cpu(buf[1]);
2137                                 c->u.port.high_port = le32_to_cpu(buf[2]);
2138                                 rc = context_read_and_validate(&c->context[0], p, fp);
2139                                 if (rc)
2140                                         goto out;
2141                                 break;
2142                         case OCON_NODE:
2143                                 rc = next_entry(nodebuf, fp, sizeof(u32) * 2);
2144                                 if (rc)
2145                                         goto out;
2146                                 c->u.node.addr = nodebuf[0]; /* network order */
2147                                 c->u.node.mask = nodebuf[1]; /* network order */
2148                                 rc = context_read_and_validate(&c->context[0], p, fp);
2149                                 if (rc)
2150                                         goto out;
2151                                 break;
2152                         case OCON_FSUSE:
2153                                 rc = next_entry(buf, fp, sizeof(u32)*2);
2154                                 if (rc)
2155                                         goto out;
2156
2157                                 rc = -EINVAL;
2158                                 c->v.behavior = le32_to_cpu(buf[0]);
2159                                 if (c->v.behavior > SECURITY_FS_USE_NONE)
2160                                         goto out;
2161
2162                                 rc = -ENOMEM;
2163                                 len = le32_to_cpu(buf[1]);
2164                                 c->u.name = kmalloc(len + 1, GFP_KERNEL);
2165                                 if (!c->u.name)
2166                                         goto out;
2167
2168                                 rc = next_entry(c->u.name, fp, len);
2169                                 if (rc)
2170                                         goto out;
2171                                 c->u.name[len] = 0;
2172                                 rc = context_read_and_validate(&c->context[0], p, fp);
2173                                 if (rc)
2174                                         goto out;
2175                                 break;
2176                         case OCON_NODE6: {
2177                                 int k;
2178
2179                                 rc = next_entry(nodebuf, fp, sizeof(u32) * 8);
2180                                 if (rc)
2181                                         goto out;
2182                                 for (k = 0; k < 4; k++)
2183                                         c->u.node6.addr[k] = nodebuf[k];
2184                                 for (k = 0; k < 4; k++)
2185                                         c->u.node6.mask[k] = nodebuf[k+4];
2186                                 rc = context_read_and_validate(&c->context[0], p, fp);
2187                                 if (rc)
2188                                         goto out;
2189                                 break;
2190                         }
2191                         }
2192                 }
2193         }
2194         rc = 0;
2195 out:
2196         return rc;
2197 }
2198
2199 /*
2200  * Read the configuration data from a policy database binary
2201  * representation file into a policy database structure.
2202  */
2203 int policydb_read(struct policydb *p, void *fp)
2204 {
2205         struct role_allow *ra, *lra;
2206         struct role_trans *tr, *ltr;
2207         int i, j, rc;
2208         __le32 buf[4];
2209         u32 len, nprim, nel;
2210
2211         char *policydb_str;
2212         struct policydb_compat_info *info;
2213
2214         rc = policydb_init(p);
2215         if (rc)
2216                 return rc;
2217
2218         /* Read the magic number and string length. */
2219         rc = next_entry(buf, fp, sizeof(u32) * 2);
2220         if (rc)
2221                 goto bad;
2222
2223         rc = -EINVAL;
2224         if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
2225                 printk(KERN_ERR "SELinux:  policydb magic number 0x%x does "
2226                        "not match expected magic number 0x%x\n",
2227                        le32_to_cpu(buf[0]), POLICYDB_MAGIC);
2228                 goto bad;
2229         }
2230
2231         rc = -EINVAL;
2232         len = le32_to_cpu(buf[1]);
2233         if (len != strlen(POLICYDB_STRING)) {
2234                 printk(KERN_ERR "SELinux:  policydb string length %d does not "
2235                        "match expected length %Zu\n",
2236                        len, strlen(POLICYDB_STRING));
2237                 goto bad;
2238         }
2239
2240         rc = -ENOMEM;
2241         policydb_str = kmalloc(len + 1, GFP_KERNEL);
2242         if (!policydb_str) {
2243                 printk(KERN_ERR "SELinux:  unable to allocate memory for policydb "
2244                        "string of length %d\n", len);
2245                 goto bad;
2246         }
2247
2248         rc = next_entry(policydb_str, fp, len);
2249         if (rc) {
2250                 printk(KERN_ERR "SELinux:  truncated policydb string identifier\n");
2251                 kfree(policydb_str);
2252                 goto bad;
2253         }
2254
2255         rc = -EINVAL;
2256         policydb_str[len] = '\0';
2257         if (strcmp(policydb_str, POLICYDB_STRING)) {
2258                 printk(KERN_ERR "SELinux:  policydb string %s does not match "
2259                        "my string %s\n", policydb_str, POLICYDB_STRING);
2260                 kfree(policydb_str);
2261                 goto bad;
2262         }
2263         /* Done with policydb_str. */
2264         kfree(policydb_str);
2265         policydb_str = NULL;
2266
2267         /* Read the version and table sizes. */
2268         rc = next_entry(buf, fp, sizeof(u32)*4);
2269         if (rc)
2270                 goto bad;
2271
2272         rc = -EINVAL;
2273         p->policyvers = le32_to_cpu(buf[0]);
2274         if (p->policyvers < POLICYDB_VERSION_MIN ||
2275             p->policyvers > POLICYDB_VERSION_MAX) {
2276                 printk(KERN_ERR "SELinux:  policydb version %d does not match "
2277                        "my version range %d-%d\n",
2278                        le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
2279                 goto bad;
2280         }
2281
2282         if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
2283                 p->mls_enabled = 1;
2284
2285                 rc = -EINVAL;
2286                 if (p->policyvers < POLICYDB_VERSION_MLS) {
2287                         printk(KERN_ERR "SELinux: security policydb version %d "
2288                                 "(MLS) not backwards compatible\n",
2289                                 p->policyvers);
2290                         goto bad;
2291                 }
2292         }
2293         p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
2294         p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
2295
2296         if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
2297                 rc = ebitmap_read(&p->policycaps, fp);
2298                 if (rc)
2299                         goto bad;
2300         }
2301
2302         if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
2303                 rc = ebitmap_read(&p->permissive_map, fp);
2304                 if (rc)
2305                         goto bad;
2306         }
2307
2308         rc = -EINVAL;
2309         info = policydb_lookup_compat(p->policyvers);
2310         if (!info) {
2311                 printk(KERN_ERR "SELinux:  unable to find policy compat info "
2312                        "for version %d\n", p->policyvers);
2313                 goto bad;
2314         }
2315
2316         rc = -EINVAL;
2317         if (le32_to_cpu(buf[2]) != info->sym_num ||
2318                 le32_to_cpu(buf[3]) != info->ocon_num) {
2319                 printk(KERN_ERR "SELinux:  policydb table sizes (%d,%d) do "
2320                        "not match mine (%d,%d)\n", le32_to_cpu(buf[2]),
2321                         le32_to_cpu(buf[3]),
2322                        info->sym_num, info->ocon_num);
2323                 goto bad;
2324         }
2325
2326         for (i = 0; i < info->sym_num; i++) {
2327                 rc = next_entry(buf, fp, sizeof(u32)*2);
2328                 if (rc)
2329                         goto bad;
2330                 nprim = le32_to_cpu(buf[0]);
2331                 nel = le32_to_cpu(buf[1]);
2332                 for (j = 0; j < nel; j++) {
2333                         rc = read_f[i](p, p->symtab[i].table, fp);
2334                         if (rc)
2335                                 goto bad;
2336                 }
2337
2338                 p->symtab[i].nprim = nprim;
2339         }
2340
2341         rc = -EINVAL;
2342         p->process_class = string_to_security_class(p, "process");
2343         if (!p->process_class)
2344                 goto bad;
2345
2346         rc = avtab_read(&p->te_avtab, fp, p);
2347         if (rc)
2348                 goto bad;
2349
2350         if (p->policyvers >= POLICYDB_VERSION_BOOL) {
2351                 rc = cond_read_list(p, fp);
2352                 if (rc)
2353                         goto bad;
2354         }
2355
2356         rc = next_entry(buf, fp, sizeof(u32));
2357         if (rc)
2358                 goto bad;
2359         nel = le32_to_cpu(buf[0]);
2360         ltr = NULL;
2361         for (i = 0; i < nel; i++) {
2362                 rc = -ENOMEM;
2363                 tr = kzalloc(sizeof(*tr), GFP_KERNEL);
2364                 if (!tr)
2365                         goto bad;
2366                 if (ltr)
2367                         ltr->next = tr;
2368                 else
2369                         p->role_tr = tr;
2370                 rc = next_entry(buf, fp, sizeof(u32)*3);
2371                 if (rc)
2372                         goto bad;
2373
2374                 rc = -EINVAL;
2375                 tr->role = le32_to_cpu(buf[0]);
2376                 tr->type = le32_to_cpu(buf[1]);
2377                 tr->new_role = le32_to_cpu(buf[2]);
2378                 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2379                         rc = next_entry(buf, fp, sizeof(u32));
2380                         if (rc)
2381                                 goto bad;
2382                         tr->tclass = le32_to_cpu(buf[0]);
2383                 } else
2384                         tr->tclass = p->process_class;
2385
2386                 if (!policydb_role_isvalid(p, tr->role) ||
2387                     !policydb_type_isvalid(p, tr->type) ||
2388                     !policydb_class_isvalid(p, tr->tclass) ||
2389                     !policydb_role_isvalid(p, tr->new_role))
2390                         goto bad;
2391                 ltr = tr;
2392         }
2393
2394         rc = next_entry(buf, fp, sizeof(u32));
2395         if (rc)
2396                 goto bad;
2397         nel = le32_to_cpu(buf[0]);
2398         lra = NULL;
2399         for (i = 0; i < nel; i++) {
2400                 rc = -ENOMEM;
2401                 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
2402                 if (!ra)
2403                         goto bad;
2404                 if (lra)
2405                         lra->next = ra;
2406                 else
2407                         p->role_allow = ra;
2408                 rc = next_entry(buf, fp, sizeof(u32)*2);
2409                 if (rc)
2410                         goto bad;
2411
2412                 rc = -EINVAL;
2413                 ra->role = le32_to_cpu(buf[0]);
2414                 ra->new_role = le32_to_cpu(buf[1]);
2415                 if (!policydb_role_isvalid(p, ra->role) ||
2416                     !policydb_role_isvalid(p, ra->new_role))
2417                         goto bad;
2418                 lra = ra;
2419         }
2420
2421         rc = filename_trans_read(p, fp);
2422         if (rc)
2423                 goto bad;
2424
2425         rc = policydb_index(p);
2426         if (rc)
2427                 goto bad;
2428
2429         rc = -EINVAL;
2430         p->process_trans_perms = string_to_av_perm(p, p->process_class, "transition");
2431         p->process_trans_perms |= string_to_av_perm(p, p->process_class, "dyntransition");
2432         if (!p->process_trans_perms)
2433                 goto bad;
2434
2435         rc = ocontext_read(p, info, fp);
2436         if (rc)
2437                 goto bad;
2438
2439         rc = genfs_read(p, fp);
2440         if (rc)
2441                 goto bad;
2442
2443         rc = range_read(p, fp);
2444         if (rc)
2445                 goto bad;
2446
2447         rc = -ENOMEM;
2448         p->type_attr_map_array = flex_array_alloc(sizeof(struct ebitmap),
2449                                                   p->p_types.nprim,
2450                                                   GFP_KERNEL | __GFP_ZERO);
2451         if (!p->type_attr_map_array)
2452                 goto bad;
2453
2454         /* preallocate so we don't have to worry about the put ever failing */
2455         rc = flex_array_prealloc(p->type_attr_map_array, 0, p->p_types.nprim,
2456                                  GFP_KERNEL | __GFP_ZERO);
2457         if (rc)
2458                 goto bad;
2459
2460         for (i = 0; i < p->p_types.nprim; i++) {
2461                 struct ebitmap *e = flex_array_get(p->type_attr_map_array, i);
2462
2463                 BUG_ON(!e);
2464                 ebitmap_init(e);
2465                 if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
2466                         rc = ebitmap_read(e, fp);
2467                         if (rc)
2468                                 goto bad;
2469                 }
2470                 /* add the type itself as the degenerate case */
2471                 rc = ebitmap_set_bit(e, i, 1);
2472                 if (rc)
2473                         goto bad;
2474         }
2475
2476         rc = policydb_bounds_sanity_check(p);
2477         if (rc)
2478                 goto bad;
2479
2480         rc = 0;
2481 out:
2482         return rc;
2483 bad:
2484         policydb_destroy(p);
2485         goto out;
2486 }
2487
2488 /*
2489  * Write a MLS level structure to a policydb binary
2490  * representation file.
2491  */
2492 static int mls_write_level(struct mls_level *l, void *fp)
2493 {
2494         __le32 buf[1];
2495         int rc;
2496
2497         buf[0] = cpu_to_le32(l->sens);
2498         rc = put_entry(buf, sizeof(u32), 1, fp);
2499         if (rc)
2500                 return rc;
2501
2502         rc = ebitmap_write(&l->cat, fp);
2503         if (rc)
2504                 return rc;
2505
2506         return 0;
2507 }
2508
2509 /*
2510  * Write a MLS range structure to a policydb binary
2511  * representation file.
2512  */
2513 static int mls_write_range_helper(struct mls_range *r, void *fp)
2514 {
2515         __le32 buf[3];
2516         size_t items;
2517         int rc, eq;
2518
2519         eq = mls_level_eq(&r->level[1], &r->level[0]);
2520
2521         if (eq)
2522                 items = 2;
2523         else
2524                 items = 3;
2525         buf[0] = cpu_to_le32(items-1);
2526         buf[1] = cpu_to_le32(r->level[0].sens);
2527         if (!eq)
2528                 buf[2] = cpu_to_le32(r->level[1].sens);
2529
2530         BUG_ON(items > (sizeof(buf)/sizeof(buf[0])));
2531
2532         rc = put_entry(buf, sizeof(u32), items, fp);
2533         if (rc)
2534                 return rc;
2535
2536         rc = ebitmap_write(&r->level[0].cat, fp);
2537         if (rc)
2538                 return rc;
2539         if (!eq) {
2540                 rc = ebitmap_write(&r->level[1].cat, fp);
2541                 if (rc)
2542                         return rc;
2543         }
2544
2545         return 0;
2546 }
2547
2548 static int sens_write(void *vkey, void *datum, void *ptr)
2549 {
2550         char *key = vkey;
2551         struct level_datum *levdatum = datum;
2552         struct policy_data *pd = ptr;
2553         void *fp = pd->fp;
2554         __le32 buf[2];
2555         size_t len;
2556         int rc;
2557
2558         len = strlen(key);
2559         buf[0] = cpu_to_le32(len);
2560         buf[1] = cpu_to_le32(levdatum->isalias);
2561         rc = put_entry(buf, sizeof(u32), 2, fp);
2562         if (rc)
2563                 return rc;
2564
2565         rc = put_entry(key, 1, len, fp);
2566         if (rc)
2567                 return rc;
2568
2569         rc = mls_write_level(levdatum->level, fp);
2570         if (rc)
2571                 return rc;
2572
2573         return 0;
2574 }
2575
2576 static int cat_write(void *vkey, void *datum, void *ptr)
2577 {
2578         char *key = vkey;
2579         struct cat_datum *catdatum = datum;
2580         struct policy_data *pd = ptr;
2581         void *fp = pd->fp;
2582         __le32 buf[3];
2583         size_t len;
2584         int rc;
2585
2586         len = strlen(key);
2587         buf[0] = cpu_to_le32(len);
2588         buf[1] = cpu_to_le32(catdatum->value);
2589         buf[2] = cpu_to_le32(catdatum->isalias);
2590         rc = put_entry(buf, sizeof(u32), 3, fp);
2591         if (rc)
2592                 return rc;
2593
2594         rc = put_entry(key, 1, len, fp);
2595         if (rc)
2596                 return rc;
2597
2598         return 0;
2599 }
2600
2601 static int role_trans_write(struct policydb *p, void *fp)
2602 {
2603         struct role_trans *r = p->role_tr;
2604         struct role_trans *tr;
2605         u32 buf[3];
2606         size_t nel;
2607         int rc;
2608
2609         nel = 0;
2610         for (tr = r; tr; tr = tr->next)
2611                 nel++;
2612         buf[0] = cpu_to_le32(nel);
2613         rc = put_entry(buf, sizeof(u32), 1, fp);
2614         if (rc)
2615                 return rc;
2616         for (tr = r; tr; tr = tr->next) {
2617                 buf[0] = cpu_to_le32(tr->role);
2618                 buf[1] = cpu_to_le32(tr->type);
2619                 buf[2] = cpu_to_le32(tr->new_role);
2620                 rc = put_entry(buf, sizeof(u32), 3, fp);
2621                 if (rc)
2622                         return rc;
2623                 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2624                         buf[0] = cpu_to_le32(tr->tclass);
2625                         rc = put_entry(buf, sizeof(u32), 1, fp);
2626                         if (rc)
2627                                 return rc;
2628                 }
2629         }
2630
2631         return 0;
2632 }
2633
2634 static int role_allow_write(struct role_allow *r, void *fp)
2635 {
2636         struct role_allow *ra;
2637         u32 buf[2];
2638         size_t nel;
2639         int rc;
2640
2641         nel = 0;
2642         for (ra = r; ra; ra = ra->next)
2643                 nel++;
2644         buf[0] = cpu_to_le32(nel);
2645         rc = put_entry(buf, sizeof(u32), 1, fp);
2646         if (rc)
2647                 return rc;
2648         for (ra = r; ra; ra = ra->next) {
2649                 buf[0] = cpu_to_le32(ra->role);
2650                 buf[1] = cpu_to_le32(ra->new_role);
2651                 rc = put_entry(buf, sizeof(u32), 2, fp);
2652                 if (rc)
2653                         return rc;
2654         }
2655         return 0;
2656 }
2657
2658 /*
2659  * Write a security context structure
2660  * to a policydb binary representation file.
2661  */
2662 static int context_write(struct policydb *p, struct context *c,
2663                          void *fp)
2664 {
2665         int rc;
2666         __le32 buf[3];
2667
2668         buf[0] = cpu_to_le32(c->user);
2669         buf[1] = cpu_to_le32(c->role);
2670         buf[2] = cpu_to_le32(c->type);
2671
2672         rc = put_entry(buf, sizeof(u32), 3, fp);
2673         if (rc)
2674                 return rc;
2675
2676         rc = mls_write_range_helper(&c->range, fp);
2677         if (rc)
2678                 return rc;
2679
2680         return 0;
2681 }
2682
2683 /*
2684  * The following *_write functions are used to
2685  * write the symbol data to a policy database
2686  * binary representation file.
2687  */
2688
2689 static int perm_write(void *vkey, void *datum, void *fp)
2690 {
2691         char *key = vkey;
2692         struct perm_datum *perdatum = datum;
2693         __le32 buf[2];
2694         size_t len;
2695         int rc;
2696
2697         len = strlen(key);
2698         buf[0] = cpu_to_le32(len);
2699         buf[1] = cpu_to_le32(perdatum->value);
2700         rc = put_entry(buf, sizeof(u32), 2, fp);
2701         if (rc)
2702                 return rc;
2703
2704         rc = put_entry(key, 1, len, fp);
2705         if (rc)
2706                 return rc;
2707
2708         return 0;
2709 }
2710
2711 static int common_write(void *vkey, void *datum, void *ptr)
2712 {
2713         char *key = vkey;
2714         struct common_datum *comdatum = datum;
2715         struct policy_data *pd = ptr;
2716         void *fp = pd->fp;
2717         __le32 buf[4];
2718         size_t len;
2719         int rc;
2720
2721         len = strlen(key);
2722         buf[0] = cpu_to_le32(len);
2723         buf[1] = cpu_to_le32(comdatum->value);
2724         buf[2] = cpu_to_le32(comdatum->permissions.nprim);
2725         buf[3] = cpu_to_le32(comdatum->permissions.table->nel);
2726         rc = put_entry(buf, sizeof(u32), 4, fp);
2727         if (rc)
2728                 return rc;
2729
2730         rc = put_entry(key, 1, len, fp);
2731         if (rc)
2732                 return rc;
2733
2734         rc = hashtab_map(comdatum->permissions.table, perm_write, fp);
2735         if (rc)
2736                 return rc;
2737
2738         return 0;
2739 }
2740
2741 static int write_cons_helper(struct policydb *p, struct constraint_node *node,
2742                              void *fp)
2743 {
2744         struct constraint_node *c;
2745         struct constraint_expr *e;
2746         __le32 buf[3];
2747         u32 nel;
2748         int rc;
2749
2750         for (c = node; c; c = c->next) {
2751                 nel = 0;
2752                 for (e = c->expr; e; e = e->next)
2753                         nel++;
2754                 buf[0] = cpu_to_le32(c->permissions);
2755                 buf[1] = cpu_to_le32(nel);
2756                 rc = put_entry(buf, sizeof(u32), 2, fp);
2757                 if (rc)
2758                         return rc;
2759                 for (e = c->expr; e; e = e->next) {
2760                         buf[0] = cpu_to_le32(e->expr_type);
2761                         buf[1] = cpu_to_le32(e->attr);
2762                         buf[2] = cpu_to_le32(e->op);
2763                         rc = put_entry(buf, sizeof(u32), 3, fp);
2764                         if (rc)
2765                                 return rc;
2766
2767                         switch (e->expr_type) {
2768                         case CEXPR_NAMES:
2769                                 rc = ebitmap_write(&e->names, fp);
2770                                 if (rc)
2771                                         return rc;
2772                                 break;
2773                         default:
2774                                 break;
2775                         }
2776                 }
2777         }
2778
2779         return 0;
2780 }
2781
2782 static int class_write(void *vkey, void *datum, void *ptr)
2783 {
2784         char *key = vkey;
2785         struct class_datum *cladatum = datum;
2786         struct policy_data *pd = ptr;
2787         void *fp = pd->fp;
2788         struct policydb *p = pd->p;
2789         struct constraint_node *c;
2790         __le32 buf[6];
2791         u32 ncons;
2792         size_t len, len2;
2793         int rc;
2794
2795         len = strlen(key);
2796         if (cladatum->comkey)
2797                 len2 = strlen(cladatum->comkey);
2798         else
2799                 len2 = 0;
2800
2801         ncons = 0;
2802         for (c = cladatum->constraints; c; c = c->next)
2803                 ncons++;
2804
2805         buf[0] = cpu_to_le32(len);
2806         buf[1] = cpu_to_le32(len2);
2807         buf[2] = cpu_to_le32(cladatum->value);
2808         buf[3] = cpu_to_le32(cladatum->permissions.nprim);
2809         if (cladatum->permissions.table)
2810                 buf[4] = cpu_to_le32(cladatum->permissions.table->nel);
2811         else
2812                 buf[4] = 0;
2813         buf[5] = cpu_to_le32(ncons);
2814         rc = put_entry(buf, sizeof(u32), 6, fp);
2815         if (rc)
2816                 return rc;
2817
2818         rc = put_entry(key, 1, len, fp);
2819         if (rc)
2820                 return rc;
2821
2822         if (cladatum->comkey) {
2823                 rc = put_entry(cladatum->comkey, 1, len2, fp);
2824                 if (rc)
2825                         return rc;
2826         }
2827
2828         rc = hashtab_map(cladatum->permissions.table, perm_write, fp);
2829         if (rc)
2830                 return rc;
2831
2832         rc = write_cons_helper(p, cladatum->constraints, fp);
2833         if (rc)
2834                 return rc;
2835
2836         /* write out the validatetrans rule */
2837         ncons = 0;
2838         for (c = cladatum->validatetrans; c; c = c->next)
2839                 ncons++;
2840
2841         buf[0] = cpu_to_le32(ncons);
2842         rc = put_entry(buf, sizeof(u32), 1, fp);
2843         if (rc)
2844                 return rc;
2845
2846         rc = write_cons_helper(p, cladatum->validatetrans, fp);
2847         if (rc)
2848                 return rc;
2849
2850         if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
2851                 buf[0] = cpu_to_le32(cladatum->default_user);
2852                 buf[1] = cpu_to_le32(cladatum->default_role);
2853                 buf[2] = cpu_to_le32(cladatum->default_range);
2854
2855                 rc = put_entry(buf, sizeof(uint32_t), 3, fp);
2856                 if (rc)
2857                         return rc;
2858         }
2859
2860         return 0;
2861 }
2862
2863 static int role_write(void *vkey, void *datum, void *ptr)
2864 {
2865         char *key = vkey;
2866         struct role_datum *role = datum;
2867         struct policy_data *pd = ptr;
2868         void *fp = pd->fp;
2869         struct policydb *p = pd->p;
2870         __le32 buf[3];
2871         size_t items, len;
2872         int rc;
2873
2874         len = strlen(key);
2875         items = 0;
2876         buf[items++] = cpu_to_le32(len);
2877         buf[items++] = cpu_to_le32(role->value);
2878         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
2879                 buf[items++] = cpu_to_le32(role->bounds);
2880
2881         BUG_ON(items > (sizeof(buf)/sizeof(buf[0])));
2882
2883         rc = put_entry(buf, sizeof(u32), items, fp);
2884         if (rc)
2885                 return rc;
2886
2887         rc = put_entry(key, 1, len, fp);
2888         if (rc)
2889                 return rc;
2890
2891         rc = ebitmap_write(&role->dominates, fp);
2892         if (rc)
2893                 return rc;
2894
2895         rc = ebitmap_write(&role->types, fp);
2896         if (rc)
2897                 return rc;
2898
2899         return 0;
2900 }
2901
2902 static int type_write(void *vkey, void *datum, void *ptr)
2903 {
2904         char *key = vkey;
2905         struct type_datum *typdatum = datum;
2906         struct policy_data *pd = ptr;
2907         struct policydb *p = pd->p;
2908         void *fp = pd->fp;
2909         __le32 buf[4];
2910         int rc;
2911         size_t items, len;
2912
2913         len = strlen(key);
2914         items = 0;
2915         buf[items++] = cpu_to_le32(len);
2916         buf[items++] = cpu_to_le32(typdatum->value);
2917         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
2918                 u32 properties = 0;
2919
2920                 if (typdatum->primary)
2921                         properties |= TYPEDATUM_PROPERTY_PRIMARY;
2922
2923                 if (typdatum->attribute)
2924                         properties |= TYPEDATUM_PROPERTY_ATTRIBUTE;
2925
2926                 buf[items++] = cpu_to_le32(properties);
2927                 buf[items++] = cpu_to_le32(typdatum->bounds);
2928         } else {
2929                 buf[items++] = cpu_to_le32(typdatum->primary);
2930         }
2931         BUG_ON(items > (sizeof(buf) / sizeof(buf[0])));
2932         rc = put_entry(buf, sizeof(u32), items, fp);
2933         if (rc)
2934                 return rc;
2935
2936         rc = put_entry(key, 1, len, fp);
2937         if (rc)
2938                 return rc;
2939
2940         return 0;
2941 }
2942
2943 static int user_write(void *vkey, void *datum, void *ptr)
2944 {
2945         char *key = vkey;
2946         struct user_datum *usrdatum = datum;
2947         struct policy_data *pd = ptr;
2948         struct policydb *p = pd->p;
2949         void *fp = pd->fp;
2950         __le32 buf[3];
2951         size_t items, len;
2952         int rc;
2953
2954         len = strlen(key);
2955         items = 0;
2956         buf[items++] = cpu_to_le32(len);
2957         buf[items++] = cpu_to_le32(usrdatum->value);
2958         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
2959                 buf[items++] = cpu_to_le32(usrdatum->bounds);
2960         BUG_ON(items > (sizeof(buf) / sizeof(buf[0])));
2961         rc = put_entry(buf, sizeof(u32), items, fp);
2962         if (rc)
2963                 return rc;
2964
2965         rc = put_entry(key, 1, len, fp);
2966         if (rc)
2967                 return rc;
2968
2969         rc = ebitmap_write(&usrdatum->roles, fp);
2970         if (rc)
2971                 return rc;
2972
2973         rc = mls_write_range_helper(&usrdatum->range, fp);
2974         if (rc)
2975                 return rc;
2976
2977         rc = mls_write_level(&usrdatum->dfltlevel, fp);
2978         if (rc)
2979                 return rc;
2980
2981         return 0;
2982 }
2983
2984 static int (*write_f[SYM_NUM]) (void *key, void *datum,
2985                                 void *datap) =
2986 {
2987         common_write,
2988         class_write,
2989         role_write,
2990         type_write,
2991         user_write,
2992         cond_write_bool,
2993         sens_write,
2994         cat_write,
2995 };
2996
2997 static int ocontext_write(struct policydb *p, struct policydb_compat_info *info,
2998                           void *fp)
2999 {
3000         unsigned int i, j, rc;
3001         size_t nel, len;
3002         __le32 buf[3];
3003         u32 nodebuf[8];
3004         struct ocontext *c;
3005         for (i = 0; i < info->ocon_num; i++) {
3006                 nel = 0;
3007                 for (c = p->ocontexts[i]; c; c = c->next)
3008                         nel++;
3009                 buf[0] = cpu_to_le32(nel);
3010                 rc = put_entry(buf, sizeof(u32), 1, fp);
3011                 if (rc)
3012                         return rc;
3013                 for (c = p->ocontexts[i]; c; c = c->next) {
3014                         switch (i) {
3015                         case OCON_ISID:
3016                                 buf[0] = cpu_to_le32(c->sid[0]);
3017                                 rc = put_entry(buf, sizeof(u32), 1, fp);
3018                                 if (rc)
3019                                         return rc;
3020                                 rc = context_write(p, &c->context[0], fp);
3021                                 if (rc)
3022                                         return rc;
3023                                 break;
3024                         case OCON_FS:
3025                         case OCON_NETIF:
3026                                 len = strlen(c->u.name);
3027                                 buf[0] = cpu_to_le32(len);
3028                                 rc = put_entry(buf, sizeof(u32), 1, fp);
3029                                 if (rc)
3030                                         return rc;
3031                                 rc = put_entry(c->u.name, 1, len, fp);
3032                                 if (rc)
3033                                         return rc;
3034                                 rc = context_write(p, &c->context[0], fp);
3035                                 if (rc)
3036                                         return rc;
3037                                 rc = context_write(p, &c->context[1], fp);
3038                                 if (rc)
3039                                         return rc;
3040                                 break;
3041                         case OCON_PORT:
3042                                 buf[0] = cpu_to_le32(c->u.port.protocol);
3043                                 buf[1] = cpu_to_le32(c->u.port.low_port);
3044                                 buf[2] = cpu_to_le32(c->u.port.high_port);
3045                                 rc = put_entry(buf, sizeof(u32), 3, fp);
3046                                 if (rc)
3047                                         return rc;
3048                                 rc = context_write(p, &c->context[0], fp);
3049                                 if (rc)
3050                                         return rc;
3051                                 break;
3052                         case OCON_NODE:
3053                                 nodebuf[0] = c->u.node.addr; /* network order */
3054                                 nodebuf[1] = c->u.node.mask; /* network order */
3055                                 rc = put_entry(nodebuf, sizeof(u32), 2, fp);
3056                                 if (rc)
3057                                         return rc;
3058                                 rc = context_write(p, &c->context[0], fp);
3059                                 if (rc)
3060                                         return rc;
3061                                 break;
3062                         case OCON_FSUSE:
3063                                 buf[0] = cpu_to_le32(c->v.behavior);
3064                                 len = strlen(c->u.name);
3065                                 buf[1] = cpu_to_le32(len);
3066                                 rc = put_entry(buf, sizeof(u32), 2, fp);
3067                                 if (rc)
3068                                         return rc;
3069                                 rc = put_entry(c->u.name, 1, len, fp);
3070                                 if (rc)
3071                                         return rc;
3072                                 rc = context_write(p, &c->context[0], fp);
3073                                 if (rc)
3074                                         return rc;
3075                                 break;
3076                         case OCON_NODE6:
3077                                 for (j = 0; j < 4; j++)
3078                                         nodebuf[j] = c->u.node6.addr[j]; /* network order */
3079                                 for (j = 0; j < 4; j++)
3080                                         nodebuf[j + 4] = c->u.node6.mask[j]; /* network order */
3081                                 rc = put_entry(nodebuf, sizeof(u32), 8, fp);
3082                                 if (rc)
3083                                         return rc;
3084                                 rc = context_write(p, &c->context[0], fp);
3085                                 if (rc)
3086                                         return rc;
3087                                 break;
3088                         }
3089                 }
3090         }
3091         return 0;
3092 }
3093
3094 static int genfs_write(struct policydb *p, void *fp)
3095 {
3096         struct genfs *genfs;
3097         struct ocontext *c;
3098         size_t len;
3099         __le32 buf[1];
3100         int rc;
3101
3102         len = 0;
3103         for (genfs = p->genfs; genfs; genfs = genfs->next)
3104                 len++;
3105         buf[0] = cpu_to_le32(len);
3106         rc = put_entry(buf, sizeof(u32), 1, fp);
3107         if (rc)
3108                 return rc;
3109         for (genfs = p->genfs; genfs; genfs = genfs->next) {
3110                 len = strlen(genfs->fstype);
3111                 buf[0] = cpu_to_le32(len);
3112                 rc = put_entry(buf, sizeof(u32), 1, fp);
3113                 if (rc)
3114                         return rc;
3115                 rc = put_entry(genfs->fstype, 1, len, fp);
3116                 if (rc)
3117                         return rc;
3118                 len = 0;
3119                 for (c = genfs->head; c; c = c->next)
3120                         len++;
3121                 buf[0] = cpu_to_le32(len);
3122                 rc = put_entry(buf, sizeof(u32), 1, fp);
3123                 if (rc)
3124                         return rc;
3125                 for (c = genfs->head; c; c = c->next) {
3126                         len = strlen(c->u.name);
3127                         buf[0] = cpu_to_le32(len);
3128                         rc = put_entry(buf, sizeof(u32), 1, fp);
3129                         if (rc)
3130                                 return rc;
3131                         rc = put_entry(c->u.name, 1, len, fp);
3132                         if (rc)
3133                                 return rc;
3134                         buf[0] = cpu_to_le32(c->v.sclass);
3135                         rc = put_entry(buf, sizeof(u32), 1, fp);
3136                         if (rc)
3137                                 return rc;
3138                         rc = context_write(p, &c->context[0], fp);
3139                         if (rc)
3140                                 return rc;
3141                 }
3142         }
3143         return 0;
3144 }
3145
3146 static int hashtab_cnt(void *key, void *data, void *ptr)
3147 {
3148         int *cnt = ptr;
3149         *cnt = *cnt + 1;
3150
3151         return 0;
3152 }
3153
3154 static int range_write_helper(void *key, void *data, void *ptr)
3155 {
3156         __le32 buf[2];
3157         struct range_trans *rt = key;
3158         struct mls_range *r = data;
3159         struct policy_data *pd = ptr;
3160         void *fp = pd->fp;
3161         struct policydb *p = pd->p;
3162         int rc;
3163
3164         buf[0] = cpu_to_le32(rt->source_type);
3165         buf[1] = cpu_to_le32(rt->target_type);
3166         rc = put_entry(buf, sizeof(u32), 2, fp);
3167         if (rc)
3168                 return rc;
3169         if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
3170                 buf[0] = cpu_to_le32(rt->target_class);
3171                 rc = put_entry(buf, sizeof(u32), 1, fp);
3172                 if (rc)
3173                         return rc;
3174         }
3175         rc = mls_write_range_helper(r, fp);
3176         if (rc)
3177                 return rc;
3178
3179         return 0;
3180 }
3181
3182 static int range_write(struct policydb *p, void *fp)
3183 {
3184         size_t nel;
3185         __le32 buf[1];
3186         int rc;
3187         struct policy_data pd;
3188
3189         pd.p = p;
3190         pd.fp = fp;
3191
3192         /* count the number of entries in the hashtab */
3193         nel = 0;
3194         rc = hashtab_map(p->range_tr, hashtab_cnt, &nel);
3195         if (rc)
3196                 return rc;
3197
3198         buf[0] = cpu_to_le32(nel);
3199         rc = put_entry(buf, sizeof(u32), 1, fp);
3200         if (rc)
3201                 return rc;
3202
3203         /* actually write all of the entries */
3204         rc = hashtab_map(p->range_tr, range_write_helper, &pd);
3205         if (rc)
3206                 return rc;
3207
3208         return 0;
3209 }
3210
3211 static int filename_write_helper(void *key, void *data, void *ptr)
3212 {
3213         __le32 buf[4];
3214         struct filename_trans *ft = key;
3215         struct filename_trans_datum *otype = data;
3216         void *fp = ptr;
3217         int rc;
3218         u32 len;
3219
3220         len = strlen(ft->name);
3221         buf[0] = cpu_to_le32(len);
3222         rc = put_entry(buf, sizeof(u32), 1, fp);
3223         if (rc)
3224                 return rc;
3225
3226         rc = put_entry(ft->name, sizeof(char), len, fp);
3227         if (rc)
3228                 return rc;
3229
3230         buf[0] = ft->stype;
3231         buf[1] = ft->ttype;
3232         buf[2] = ft->tclass;
3233         buf[3] = otype->otype;
3234
3235         rc = put_entry(buf, sizeof(u32), 4, fp);
3236         if (rc)
3237                 return rc;
3238
3239         return 0;
3240 }
3241
3242 static int filename_trans_write(struct policydb *p, void *fp)
3243 {
3244         u32 nel;
3245         __le32 buf[1];
3246         int rc;
3247
3248         if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
3249                 return 0;
3250
3251         nel = 0;
3252         rc = hashtab_map(p->filename_trans, hashtab_cnt, &nel);
3253         if (rc)
3254                 return rc;
3255
3256         buf[0] = cpu_to_le32(nel);
3257         rc = put_entry(buf, sizeof(u32), 1, fp);
3258         if (rc)
3259                 return rc;
3260
3261         rc = hashtab_map(p->filename_trans, filename_write_helper, fp);
3262         if (rc)
3263                 return rc;
3264
3265         return 0;
3266 }
3267
3268 /*
3269  * Write the configuration data in a policy database
3270  * structure to a policy database binary representation
3271  * file.
3272  */
3273 int policydb_write(struct policydb *p, void *fp)
3274 {
3275         unsigned int i, num_syms;
3276         int rc;
3277         __le32 buf[4];
3278         u32 config;
3279         size_t len;
3280         struct policydb_compat_info *info;
3281
3282         /*
3283          * refuse to write policy older than compressed avtab
3284          * to simplify the writer.  There are other tests dropped
3285          * since we assume this throughout the writer code.  Be
3286          * careful if you ever try to remove this restriction
3287          */
3288         if (p->policyvers < POLICYDB_VERSION_AVTAB) {
3289                 printk(KERN_ERR "SELinux: refusing to write policy version %d."
3290                        "  Because it is less than version %d\n", p->policyvers,
3291                        POLICYDB_VERSION_AVTAB);
3292                 return -EINVAL;
3293         }
3294
3295         config = 0;
3296         if (p->mls_enabled)
3297                 config |= POLICYDB_CONFIG_MLS;
3298
3299         if (p->reject_unknown)
3300                 config |= REJECT_UNKNOWN;
3301         if (p->allow_unknown)
3302                 config |= ALLOW_UNKNOWN;
3303
3304         /* Write the magic number and string identifiers. */
3305         buf[0] = cpu_to_le32(POLICYDB_MAGIC);
3306         len = strlen(POLICYDB_STRING);
3307         buf[1] = cpu_to_le32(len);
3308         rc = put_entry(buf, sizeof(u32), 2, fp);
3309         if (rc)
3310                 return rc;
3311         rc = put_entry(POLICYDB_STRING, 1, len, fp);
3312         if (rc)
3313                 return rc;
3314
3315         /* Write the version, config, and table sizes. */
3316         info = policydb_lookup_compat(p->policyvers);
3317         if (!info) {
3318                 printk(KERN_ERR "SELinux: compatibility lookup failed for policy "
3319                     "version %d", p->policyvers);
3320                 return -EINVAL;
3321         }
3322
3323         buf[0] = cpu_to_le32(p->policyvers);
3324         buf[1] = cpu_to_le32(config);
3325         buf[2] = cpu_to_le32(info->sym_num);
3326         buf[3] = cpu_to_le32(info->ocon_num);
3327
3328         rc = put_entry(buf, sizeof(u32), 4, fp);
3329         if (rc)
3330                 return rc;
3331
3332         if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
3333                 rc = ebitmap_write(&p->policycaps, fp);
3334                 if (rc)
3335                         return rc;
3336         }
3337
3338         if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
3339                 rc = ebitmap_write(&p->permissive_map, fp);
3340                 if (rc)
3341                         return rc;
3342         }
3343
3344         num_syms = info->sym_num;
3345         for (i = 0; i < num_syms; i++) {
3346                 struct policy_data pd;
3347
3348                 pd.fp = fp;
3349                 pd.p = p;
3350
3351                 buf[0] = cpu_to_le32(p->symtab[i].nprim);
3352                 buf[1] = cpu_to_le32(p->symtab[i].table->nel);
3353
3354                 rc = put_entry(buf, sizeof(u32), 2, fp);
3355                 if (rc)
3356                         return rc;
3357                 rc = hashtab_map(p->symtab[i].table, write_f[i], &pd);
3358                 if (rc)
3359                         return rc;
3360         }
3361
3362         rc = avtab_write(p, &p->te_avtab, fp);
3363         if (rc)
3364                 return rc;
3365
3366         rc = cond_write_list(p, p->cond_list, fp);
3367         if (rc)
3368                 return rc;
3369
3370         rc = role_trans_write(p, fp);
3371         if (rc)
3372                 return rc;
3373
3374         rc = role_allow_write(p->role_allow, fp);
3375         if (rc)
3376                 return rc;
3377
3378         rc = filename_trans_write(p, fp);
3379         if (rc)
3380                 return rc;
3381
3382         rc = ocontext_write(p, info, fp);
3383         if (rc)
3384                 return rc;
3385
3386         rc = genfs_write(p, fp);
3387         if (rc)
3388                 return rc;
3389
3390         rc = range_write(p, fp);
3391         if (rc)
3392                 return rc;
3393
3394         for (i = 0; i < p->p_types.nprim; i++) {
3395                 struct ebitmap *e = flex_array_get(p->type_attr_map_array, i);
3396
3397                 BUG_ON(!e);
3398                 rc = ebitmap_write(e, fp);
3399                 if (rc)
3400                         return rc;
3401         }
3402
3403         return 0;
3404 }