security/selinux/ss/policydb.c

   1 /*
   2  * Implementation of the policy database.
   3  *
   4  * Author : Stephen Smalley, <sds@epoch.ncsc.mil>
   5  */
   6
   7 /*
   8  * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
   9  *
  10  *      Support for enhanced MLS infrastructure.
  11  *
  12  * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
  13  *
  14  *      Added conditional policy language extensions
  15  *
  16  * Updated: Hewlett-Packard <paul@paul-moore.com>
  17  *
  18  *      Added support for the policy capability bitmap
  19  *
  20  * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
  21  * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
  22  * Copyright (C) 2003 - 2004 Tresys Technology, LLC
  23  *      This program is free software; you can redistribute it and/or modify
  24  *      it under the terms of the GNU General Public License as published by
  25  *      the Free Software Foundation, version 2.
  26  */
  27
  28 #include <linux/kernel.h>
  29 #include <linux/sched.h>
  30 #include <linux/slab.h>
  31 #include <linux/string.h>
  32 #include <linux/errno.h>
  33 #include <linux/audit.h>
  34 #include <linux/flex_array.h>
  35 #include "security.h"
  36
  37 #include "policydb.h"
  38 #include "conditional.h"
  39 #include "mls.h"
  40 #include "services.h"
  41
  42 #define _DEBUG_HASHES
  43
  44 #ifdef DEBUG_HASHES
  45 static const char *symtab_name[SYM_NUM] = {
  46         "common prefixes",
  47         "classes",
  48         "roles",
  49         "types",
  50         "users",
  51         "bools",
  52         "levels",
  53         "categories",
  54 };
  55 #endif
  56
  57 static unsigned int symtab_sizes[SYM_NUM] = {
  58         2,
  59         32,
  60         16,
  61         512,
  62         128,
  63         16,
  64         16,
  65         16,
  66 };
  67
  68 struct policydb_compat_info {
  69         int version;
  70         int sym_num;
  71         int ocon_num;
  72 };
  73
  74 /* These need to be updated if SYM_NUM or OCON_NUM changes */
  75 static struct policydb_compat_info policydb_compat[] = {
  76         {
  77                 .version        = POLICYDB_VERSION_BASE,
  78                 .sym_num        = SYM_NUM - 3,
  79                 .ocon_num       = OCON_NUM - 1,
  80         },
  81         {
  82                 .version        = POLICYDB_VERSION_BOOL,
  83                 .sym_num        = SYM_NUM - 2,
  84                 .ocon_num       = OCON_NUM - 1,
  85         },
  86         {
  87                 .version        = POLICYDB_VERSION_IPV6,
  88                 .sym_num        = SYM_NUM - 2,
  89                 .ocon_num       = OCON_NUM,
  90         },
  91         {
  92                 .version        = POLICYDB_VERSION_NLCLASS,
  93                 .sym_num        = SYM_NUM - 2,
  94                 .ocon_num       = OCON_NUM,
  95         },
  96         {
  97                 .version        = POLICYDB_VERSION_MLS,
  98                 .sym_num        = SYM_NUM,
  99                 .ocon_num       = OCON_NUM,
 100         },
 101         {
 102                 .version        = POLICYDB_VERSION_AVTAB,
 103                 .sym_num        = SYM_NUM,
 104                 .ocon_num       = OCON_NUM,
 105         },
 106         {
 107                 .version        = POLICYDB_VERSION_RANGETRANS,
 108                 .sym_num        = SYM_NUM,
 109                 .ocon_num       = OCON_NUM,
 110         },
 111         {
 112                 .version        = POLICYDB_VERSION_POLCAP,
 113                 .sym_num        = SYM_NUM,
 114                 .ocon_num       = OCON_NUM,
 115         },
 116         {
 117                 .version        = POLICYDB_VERSION_PERMISSIVE,
 118                 .sym_num        = SYM_NUM,
 119                 .ocon_num       = OCON_NUM,
 120         },
 121         {
 122                 .version        = POLICYDB_VERSION_BOUNDARY,
 123                 .sym_num        = SYM_NUM,
 124                 .ocon_num       = OCON_NUM,
 125         },
 126         {
 127                 .version        = POLICYDB_VERSION_FILENAME_TRANS,
 128                 .sym_num        = SYM_NUM,
 129                 .ocon_num       = OCON_NUM,
 130         },
 131         {
 132                 .version        = POLICYDB_VERSION_ROLETRANS,
 133                 .sym_num        = SYM_NUM,
 134                 .ocon_num       = OCON_NUM,
 135         },
 136         {
 137                 .version        = POLICYDB_VERSION_NEW_OBJECT_DEFAULTS,
 138                 .sym_num        = SYM_NUM,
 139                 .ocon_num       = OCON_NUM,
 140         },
 141         {
 142                 .version        = POLICYDB_VERSION_DEFAULT_TYPE,
 143                 .sym_num        = SYM_NUM,
 144                 .ocon_num       = OCON_NUM,
 145         },
 146 };
 147
 148 static struct policydb_compat_info *policydb_lookup_compat(int version)
 149 {
 150         int i;
 151         struct policydb_compat_info *info = NULL;
 152
 153         for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) {
 154                 if (policydb_compat[i].version == version) {
 155                         info = &policydb_compat[i];
 156                         break;
 157                 }
 158         }
 159         return info;
 160 }
 161
 162 /*
 163  * Initialize the role table.
 164  */
 165 static int roles_init(struct policydb *p)
 166 {
 167         char *key = NULL;
 168         int rc;
 169         struct role_datum *role;
 170
 171         rc = -ENOMEM;
 172         role = kzalloc(sizeof(*role), GFP_KERNEL);
 173         if (!role)
 174                 goto out;
 175
 176         rc = -EINVAL;
 177         role->value = ++p->p_roles.nprim;
 178         if (role->value != OBJECT_R_VAL)
 179                 goto out;
 180
 181         rc = -ENOMEM;
 182         key = kstrdup(OBJECT_R, GFP_KERNEL);
 183         if (!key)
 184                 goto out;
 185
 186         rc = hashtab_insert(p->p_roles.table, key, role);
 187         if (rc)
 188                 goto out;
 189
 190         return 0;
 191 out:
 192         kfree(key);
 193         kfree(role);
 194         return rc;
 195 }
 196
 197 static u32 filenametr_hash(struct hashtab *h, const void *k)
 198 {
 199         const struct filename_trans *ft = k;
 200         unsigned long hash;
 201         unsigned int byte_num;
 202         unsigned char focus;
 203
 204         hash = ft->stype ^ ft->ttype ^ ft->tclass;
 205
 206         byte_num = 0;
 207         while ((focus = ft->name[byte_num++]))
 208                 hash = partial_name_hash(focus, hash);
 209         return hash & (h->size - 1);
 210 }
 211
 212 static int filenametr_cmp(struct hashtab *h, const void *k1, const void *k2)
 213 {
 214         const struct filename_trans *ft1 = k1;
 215         const struct filename_trans *ft2 = k2;
 216         int v;
 217
 218         v = ft1->stype - ft2->stype;
 219         if (v)
 220                 return v;
 221
 222         v = ft1->ttype - ft2->ttype;
 223         if (v)
 224                 return v;
 225
 226         v = ft1->tclass - ft2->tclass;
 227         if (v)
 228                 return v;
 229
 230         return strcmp(ft1->name, ft2->name);
 231
 232 }
 233
 234 static u32 rangetr_hash(struct hashtab *h, const void *k)
 235 {
 236         const struct range_trans *key = k;
 237         return (key->source_type + (key->target_type << 3) +
 238                 (key->target_class << 5)) & (h->size - 1);
 239 }
 240
 241 static int rangetr_cmp(struct hashtab *h, const void *k1, const void *k2)
 242 {
 243         const struct range_trans *key1 = k1, *key2 = k2;
 244         int v;
 245
 246         v = key1->source_type - key2->source_type;
 247         if (v)
 248                 return v;
 249
 250         v = key1->target_type - key2->target_type;
 251         if (v)
 252                 return v;
 253
 254         v = key1->target_class - key2->target_class;
 255
 256         return v;
 257 }
 258
 259 /*
 260  * Initialize a policy database structure.
 261  */
 262 static int policydb_init(struct policydb *p)
 263 {
 264         int i, rc;
 265
 266         memset(p, 0, sizeof(*p));
 267
 268         for (i = 0; i < SYM_NUM; i++) {
 269                 rc = symtab_init(&p->symtab[i], symtab_sizes[i]);
 270                 if (rc)
 271                         goto out;
 272         }
 273
 274         rc = avtab_init(&p->te_avtab);
 275         if (rc)
 276                 goto out;
 277
 278         rc = roles_init(p);
 279         if (rc)
 280                 goto out;
 281
 282         rc = cond_policydb_init(p);
 283         if (rc)
 284                 goto out;
 285
 286         p->filename_trans = hashtab_create(filenametr_hash, filenametr_cmp, (1 << 10));
 287         if (!p->filename_trans)
 288                 goto out;
 289
 290         p->range_tr = hashtab_create(rangetr_hash, rangetr_cmp, 256);
 291         if (!p->range_tr)
 292                 goto out;
 293
 294         ebitmap_init(&p->filename_trans_ttypes);
 295         ebitmap_init(&p->policycaps);
 296         ebitmap_init(&p->permissive_map);
 297
 298         return 0;
 299 out:
 300         hashtab_destroy(p->filename_trans);
 301         hashtab_destroy(p->range_tr);
 302         for (i = 0; i < SYM_NUM; i++)
 303                 hashtab_destroy(p->symtab[i].table);
 304         return rc;
 305 }
 306
 307 /*
 308  * The following *_index functions are used to
 309  * define the val_to_name and val_to_struct arrays
 310  * in a policy database structure.  The val_to_name
 311  * arrays are used when converting security context
 312  * structures into string representations.  The
 313  * val_to_struct arrays are used when the attributes
 314  * of a class, role, or user are needed.
 315  */
 316
 317 static int common_index(void *key, void *datum, void *datap)
 318 {
 319         struct policydb *p;
 320         struct common_datum *comdatum;
 321         struct flex_array *fa;
 322
 323         comdatum = datum;
 324         p = datap;
 325         if (!comdatum->value || comdatum->value > p->p_commons.nprim)
 326                 return -EINVAL;
 327
 328         fa = p->sym_val_to_name[SYM_COMMONS];
 329         if (flex_array_put_ptr(fa, comdatum->value - 1, key,
 330                                GFP_KERNEL | __GFP_ZERO))
 331                 BUG();
 332         return 0;
 333 }
 334
 335 static int class_index(void *key, void *datum, void *datap)
 336 {
 337         struct policydb *p;
 338         struct class_datum *cladatum;
 339         struct flex_array *fa;
 340
 341         cladatum = datum;
 342         p = datap;
 343         if (!cladatum->value || cladatum->value > p->p_classes.nprim)
 344                 return -EINVAL;
 345         fa = p->sym_val_to_name[SYM_CLASSES];
 346         if (flex_array_put_ptr(fa, cladatum->value - 1, key,
 347                                GFP_KERNEL | __GFP_ZERO))
 348                 BUG();
 349         p->class_val_to_struct[cladatum->value - 1] = cladatum;
 350         return 0;
 351 }
 352
 353 static int role_index(void *key, void *datum, void *datap)
 354 {
 355         struct policydb *p;
 356         struct role_datum *role;
 357         struct flex_array *fa;
 358
 359         role = datum;
 360         p = datap;
 361         if (!role->value
 362             || role->value > p->p_roles.nprim
 363             || role->bounds > p->p_roles.nprim)
 364                 return -EINVAL;
 365
 366         fa = p->sym_val_to_name[SYM_ROLES];
 367         if (flex_array_put_ptr(fa, role->value - 1, key,
 368                                GFP_KERNEL | __GFP_ZERO))
 369                 BUG();
 370         p->role_val_to_struct[role->value - 1] = role;
 371         return 0;
 372 }
 373
 374 static int type_index(void *key, void *datum, void *datap)
 375 {
 376         struct policydb *p;
 377         struct type_datum *typdatum;
 378         struct flex_array *fa;
 379
 380         typdatum = datum;
 381         p = datap;
 382
 383         if (typdatum->primary) {
 384                 if (!typdatum->value
 385                     || typdatum->value > p->p_types.nprim
 386                     || typdatum->bounds > p->p_types.nprim)
 387                         return -EINVAL;
 388                 fa = p->sym_val_to_name[SYM_TYPES];
 389                 if (flex_array_put_ptr(fa, typdatum->value - 1, key,
 390                                        GFP_KERNEL | __GFP_ZERO))
 391                         BUG();
 392
 393                 fa = p->type_val_to_struct_array;
 394                 if (flex_array_put_ptr(fa, typdatum->value - 1, typdatum,
 395                                        GFP_KERNEL | __GFP_ZERO))
 396                         BUG();
 397         }
 398
 399         return 0;
 400 }
 401
 402 static int user_index(void *key, void *datum, void *datap)
 403 {
 404         struct policydb *p;
 405         struct user_datum *usrdatum;
 406         struct flex_array *fa;
 407
 408         usrdatum = datum;
 409         p = datap;
 410         if (!usrdatum->value
 411             || usrdatum->value > p->p_users.nprim
 412             || usrdatum->bounds > p->p_users.nprim)
 413                 return -EINVAL;
 414
 415         fa = p->sym_val_to_name[SYM_USERS];
 416         if (flex_array_put_ptr(fa, usrdatum->value - 1, key,
 417                                GFP_KERNEL | __GFP_ZERO))
 418                 BUG();
 419         p->user_val_to_struct[usrdatum->value - 1] = usrdatum;
 420         return 0;
 421 }
 422
 423 static int sens_index(void *key, void *datum, void *datap)
 424 {
 425         struct policydb *p;
 426         struct level_datum *levdatum;
 427         struct flex_array *fa;
 428
 429         levdatum = datum;
 430         p = datap;
 431
 432         if (!levdatum->isalias) {
 433                 if (!levdatum->level->sens ||
 434                     levdatum->level->sens > p->p_levels.nprim)
 435                         return -EINVAL;
 436                 fa = p->sym_val_to_name[SYM_LEVELS];
 437                 if (flex_array_put_ptr(fa, levdatum->level->sens - 1, key,
 438                                        GFP_KERNEL | __GFP_ZERO))
 439                         BUG();
 440         }
 441
 442         return 0;
 443 }
 444
 445 static int cat_index(void *key, void *datum, void *datap)
 446 {
 447         struct policydb *p;
 448         struct cat_datum *catdatum;
 449         struct flex_array *fa;
 450
 451         catdatum = datum;
 452         p = datap;
 453
 454         if (!catdatum->isalias) {
 455                 if (!catdatum->value || catdatum->value > p->p_cats.nprim)
 456                         return -EINVAL;
 457                 fa = p->sym_val_to_name[SYM_CATS];
 458                 if (flex_array_put_ptr(fa, catdatum->value - 1, key,
 459                                        GFP_KERNEL | __GFP_ZERO))
 460                         BUG();
 461         }
 462
 463         return 0;
 464 }
 465
 466 static int (*index_f[SYM_NUM]) (void *key, void *datum, void *datap) =
 467 {
 468         common_index,
 469         class_index,
 470         role_index,
 471         type_index,
 472         user_index,
 473         cond_index_bool,
 474         sens_index,
 475         cat_index,
 476 };
 477
 478 #ifdef DEBUG_HASHES
 479 static void hash_eval(struct hashtab *h, const char *hash_name)
 480 {
 481         struct hashtab_info info;
 482
 483         hashtab_stat(h, &info);
 484         printk(KERN_DEBUG "SELinux: %s:  %d entries and %d/%d buckets used, "
 485                "longest chain length %d\n", hash_name, h->nel,
 486                info.slots_used, h->size, info.max_chain_len);
 487 }
 488
 489 static void symtab_hash_eval(struct symtab *s)
 490 {
 491         int i;
 492
 493         for (i = 0; i < SYM_NUM; i++)
 494                 hash_eval(s[i].table, symtab_name[i]);
 495 }
 496
 497 #else
 498 static inline void hash_eval(struct hashtab *h, char *hash_name)
 499 {
 500 }
 501 #endif
 502
 503 /*
 504  * Define the other val_to_name and val_to_struct arrays
 505  * in a policy database structure.
 506  *
 507  * Caller must clean up on failure.
 508  */
 509 static int policydb_index(struct policydb *p)
 510 {
 511         int i, rc;
 512
 513         printk(KERN_DEBUG "SELinux:  %d users, %d roles, %d types, %d bools",
 514                p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim, p->p_bools.nprim);
 515         if (p->mls_enabled)
 516                 printk(", %d sens, %d cats", p->p_levels.nprim,
 517                        p->p_cats.nprim);
 518         printk("\n");
 519
 520         printk(KERN_DEBUG "SELinux:  %d classes, %d rules\n",
 521                p->p_classes.nprim, p->te_avtab.nel);
 522
 523 #ifdef DEBUG_HASHES
 524         avtab_hash_eval(&p->te_avtab, "rules");
 525         symtab_hash_eval(p->symtab);
 526 #endif
 527
 528         rc = -ENOMEM;
 529         p->class_val_to_struct =
 530                 kmalloc(p->p_classes.nprim * sizeof(*(p->class_val_to_struct)),
 531                         GFP_KERNEL);
 532         if (!p->class_val_to_struct)
 533                 goto out;
 534
 535         rc = -ENOMEM;
 536         p->role_val_to_struct =
 537                 kmalloc(p->p_roles.nprim * sizeof(*(p->role_val_to_struct)),
 538                         GFP_KERNEL);
 539         if (!p->role_val_to_struct)
 540                 goto out;
 541
 542         rc = -ENOMEM;
 543         p->user_val_to_struct =
 544                 kmalloc(p->p_users.nprim * sizeof(*(p->user_val_to_struct)),
 545                         GFP_KERNEL);
 546         if (!p->user_val_to_struct)
 547                 goto out;
 548
 549         /* Yes, I want the sizeof the pointer, not the structure */
 550         rc = -ENOMEM;
 551         p->type_val_to_struct_array = flex_array_alloc(sizeof(struct type_datum *),
 552                                                        p->p_types.nprim,
 553                                                        GFP_KERNEL | __GFP_ZERO);
 554         if (!p->type_val_to_struct_array)
 555                 goto out;
 556
 557         rc = flex_array_prealloc(p->type_val_to_struct_array, 0,
 558                                  p->p_types.nprim, GFP_KERNEL | __GFP_ZERO);
 559         if (rc)
 560                 goto out;
 561
 562         rc = cond_init_bool_indexes(p);
 563         if (rc)
 564                 goto out;
 565
 566         for (i = 0; i < SYM_NUM; i++) {
 567                 rc = -ENOMEM;
 568                 p->sym_val_to_name[i] = flex_array_alloc(sizeof(char *),
 569                                                          p->symtab[i].nprim,
 570                                                          GFP_KERNEL | __GFP_ZERO);
 571                 if (!p->sym_val_to_name[i])
 572                         goto out;
 573
 574                 rc = flex_array_prealloc(p->sym_val_to_name[i],
 575                                          0, p->symtab[i].nprim,
 576                                          GFP_KERNEL | __GFP_ZERO);
 577                 if (rc)
 578                         goto out;
 579
 580                 rc = hashtab_map(p->symtab[i].table, index_f[i], p);
 581                 if (rc)
 582                         goto out;
 583         }
 584         rc = 0;
 585 out:
 586         return rc;
 587 }
 588
 589 /*
 590  * The following *_destroy functions are used to
 591  * free any memory allocated for each kind of
 592  * symbol data in the policy database.
 593  */
 594
 595 static int perm_destroy(void *key, void *datum, void *p)
 596 {
 597         kfree(key);
 598         kfree(datum);
 599         return 0;
 600 }
 601
 602 static int common_destroy(void *key, void *datum, void *p)
 603 {
 604         struct common_datum *comdatum;
 605
 606         kfree(key);
 607         if (datum) {
 608                 comdatum = datum;
 609                 hashtab_map(comdatum->permissions.table, perm_destroy, NULL);
 610                 hashtab_destroy(comdatum->permissions.table);
 611         }
 612         kfree(datum);
 613         return 0;
 614 }
 615
 616 static int cls_destroy(void *key, void *datum, void *p)
 617 {
 618         struct class_datum *cladatum;
 619         struct constraint_node *constraint, *ctemp;
 620         struct constraint_expr *e, *etmp;
 621
 622         kfree(key);
 623         if (datum) {
 624                 cladatum = datum;
 625                 hashtab_map(cladatum->permissions.table, perm_destroy, NULL);
 626                 hashtab_destroy(cladatum->permissions.table);
 627                 constraint = cladatum->constraints;
 628                 while (constraint) {
 629                         e = constraint->expr;
 630                         while (e) {
 631                                 ebitmap_destroy(&e->names);
 632                                 etmp = e;
 633                                 e = e->next;
 634                                 kfree(etmp);
 635                         }
 636                         ctemp = constraint;
 637                         constraint = constraint->next;
 638                         kfree(ctemp);
 639                 }
 640
 641                 constraint = cladatum->validatetrans;
 642                 while (constraint) {
 643                         e = constraint->expr;
 644                         while (e) {
 645                                 ebitmap_destroy(&e->names);
 646                                 etmp = e;
 647                                 e = e->next;
 648                                 kfree(etmp);
 649                         }
 650                         ctemp = constraint;
 651                         constraint = constraint->next;
 652                         kfree(ctemp);
 653                 }
 654
 655                 kfree(cladatum->comkey);
 656         }
 657         kfree(datum);
 658         return 0;
 659 }
 660
 661 static int role_destroy(void *key, void *datum, void *p)
 662 {
 663         struct role_datum *role;
 664
 665         kfree(key);
 666         if (datum) {
 667                 role = datum;
 668                 ebitmap_destroy(&role->dominates);
 669                 ebitmap_destroy(&role->types);
 670         }
 671         kfree(datum);
 672         return 0;
 673 }
 674
 675 static int type_destroy(void *key, void *datum, void *p)
 676 {
 677         kfree(key);
 678         kfree(datum);
 679         return 0;
 680 }
 681
 682 static int user_destroy(void *key, void *datum, void *p)
 683 {
 684         struct user_datum *usrdatum;
 685
 686         kfree(key);
 687         if (datum) {
 688                 usrdatum = datum;
 689                 ebitmap_destroy(&usrdatum->roles);
 690                 ebitmap_destroy(&usrdatum->range.level[0].cat);
 691                 ebitmap_destroy(&usrdatum->range.level[1].cat);
 692                 ebitmap_destroy(&usrdatum->dfltlevel.cat);
 693         }
 694         kfree(datum);
 695         return 0;
 696 }
 697
 698 static int sens_destroy(void *key, void *datum, void *p)
 699 {
 700         struct level_datum *levdatum;
 701
 702         kfree(key);
 703         if (datum) {
 704                 levdatum = datum;
 705                 ebitmap_destroy(&levdatum->level->cat);
 706                 kfree(levdatum->level);
 707         }
 708         kfree(datum);
 709         return 0;
 710 }
 711
 712 static int cat_destroy(void *key, void *datum, void *p)
 713 {
 714         kfree(key);
 715         kfree(datum);
 716         return 0;
 717 }
 718
 719 static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) =
 720 {
 721         common_destroy,
 722         cls_destroy,
 723         role_destroy,
 724         type_destroy,
 725         user_destroy,
 726         cond_destroy_bool,
 727         sens_destroy,
 728         cat_destroy,
 729 };
 730
 731 static int filenametr_destroy(void *key, void *datum, void *p)
 732 {
 733         struct filename_trans *ft = key;
 734         kfree(ft->name);
 735         kfree(key);
 736         kfree(datum);
 737         cond_resched();
 738         return 0;
 739 }
 740
 741 static int range_tr_destroy(void *key, void *datum, void *p)
 742 {
 743         struct mls_range *rt = datum;
 744         kfree(key);
 745         ebitmap_destroy(&rt->level[0].cat);
 746         ebitmap_destroy(&rt->level[1].cat);
 747         kfree(datum);
 748         cond_resched();
 749         return 0;
 750 }
 751
 752 static void ocontext_destroy(struct ocontext *c, int i)
 753 {
 754         if (!c)
 755                 return;
 756
 757         context_destroy(&c->context[0]);
 758         context_destroy(&c->context[1]);
 759         if (i == OCON_ISID || i == OCON_FS ||
 760             i == OCON_NETIF || i == OCON_FSUSE)
 761                 kfree(c->u.name);
 762         kfree(c);
 763 }
 764
 765 /*
 766  * Free any memory allocated by a policy database structure.
 767  */
 768 void policydb_destroy(struct policydb *p)
 769 {
 770         struct ocontext *c, *ctmp;
 771         struct genfs *g, *gtmp;
 772         int i;
 773         struct role_allow *ra, *lra = NULL;
 774         struct role_trans *tr, *ltr = NULL;
 775
 776         for (i = 0; i < SYM_NUM; i++) {
 777                 cond_resched();
 778                 hashtab_map(p->symtab[i].table, destroy_f[i], NULL);
 779                 hashtab_destroy(p->symtab[i].table);
 780         }
 781
 782         for (i = 0; i < SYM_NUM; i++) {
 783                 if (p->sym_val_to_name[i])
 784                         flex_array_free(p->sym_val_to_name[i]);
 785         }
 786
 787         kfree(p->class_val_to_struct);
 788         kfree(p->role_val_to_struct);
 789         kfree(p->user_val_to_struct);
 790         if (p->type_val_to_struct_array)
 791                 flex_array_free(p->type_val_to_struct_array);
 792
 793         avtab_destroy(&p->te_avtab);
 794
 795         for (i = 0; i < OCON_NUM; i++) {
 796                 cond_resched();
 797                 c = p->ocontexts[i];
 798                 while (c) {
 799                         ctmp = c;
 800                         c = c->next;
 801                         ocontext_destroy(ctmp, i);
 802                 }
 803                 p->ocontexts[i] = NULL;
 804         }
 805
 806         g = p->genfs;
 807         while (g) {
 808                 cond_resched();
 809                 kfree(g->fstype);
 810                 c = g->head;
 811                 while (c) {
 812                         ctmp = c;
 813                         c = c->next;
 814                         ocontext_destroy(ctmp, OCON_FSUSE);
 815                 }
 816                 gtmp = g;
 817                 g = g->next;
 818                 kfree(gtmp);
 819         }
 820         p->genfs = NULL;
 821
 822         cond_policydb_destroy(p);
 823
 824         for (tr = p->role_tr; tr; tr = tr->next) {
 825                 cond_resched();
 826                 kfree(ltr);
 827                 ltr = tr;
 828         }
 829         kfree(ltr);
 830
 831         for (ra = p->role_allow; ra; ra = ra->next) {
 832                 cond_resched();
 833                 kfree(lra);
 834                 lra = ra;
 835         }
 836         kfree(lra);
 837
 838         hashtab_map(p->filename_trans, filenametr_destroy, NULL);
 839         hashtab_destroy(p->filename_trans);
 840
 841         hashtab_map(p->range_tr, range_tr_destroy, NULL);
 842         hashtab_destroy(p->range_tr);
 843
 844         if (p->type_attr_map_array) {
 845                 for (i = 0; i < p->p_types.nprim; i++) {
 846                         struct ebitmap *e;
 847
 848                         e = flex_array_get(p->type_attr_map_array, i);
 849                         if (!e)
 850                                 continue;
 851                         ebitmap_destroy(e);
 852                 }
 853                 flex_array_free(p->type_attr_map_array);
 854         }
 855
 856         ebitmap_destroy(&p->filename_trans_ttypes);
 857         ebitmap_destroy(&p->policycaps);
 858         ebitmap_destroy(&p->permissive_map);
 859
 860         return;
 861 }
 862
 863 /*
 864  * Load the initial SIDs specified in a policy database
 865  * structure into a SID table.
 866  */
 867 int policydb_load_isids(struct policydb *p, struct sidtab *s)
 868 {
 869         struct ocontext *head, *c;
 870         int rc;
 871
 872         rc = sidtab_init(s);
 873         if (rc) {
 874                 printk(KERN_ERR "SELinux:  out of memory on SID table init\n");
 875                 goto out;
 876         }
 877
 878         head = p->ocontexts[OCON_ISID];
 879         for (c = head; c; c = c->next) {
 880                 rc = -EINVAL;
 881                 if (!c->context[0].user) {
 882                         printk(KERN_ERR "SELinux:  SID %s was never defined.\n",
 883                                 c->u.name);
 884                         goto out;
 885                 }
 886
 887                 rc = sidtab_insert(s, c->sid[0], &c->context[0]);
 888                 if (rc) {
 889                         printk(KERN_ERR "SELinux:  unable to load initial SID %s.\n",
 890                                 c->u.name);
 891                         goto out;
 892                 }
 893         }
 894         rc = 0;
 895 out:
 896         return rc;
 897 }
 898
 899 int policydb_class_isvalid(struct policydb *p, unsigned int class)
 900 {
 901         if (!class || class > p->p_classes.nprim)
 902                 return 0;
 903         return 1;
 904 }
 905
 906 int policydb_role_isvalid(struct policydb *p, unsigned int role)
 907 {
 908         if (!role || role > p->p_roles.nprim)
 909                 return 0;
 910         return 1;
 911 }
 912
 913 int policydb_type_isvalid(struct policydb *p, unsigned int type)
 914 {
 915         if (!type || type > p->p_types.nprim)
 916                 return 0;
 917         return 1;
 918 }
 919
 920 /*
 921  * Return 1 if the fields in the security context
 922  * structure `c' are valid.  Return 0 otherwise.
 923  */
 924 int policydb_context_isvalid(struct policydb *p, struct context *c)
 925 {
 926         struct role_datum *role;
 927         struct user_datum *usrdatum;
 928
 929         if (!c->role || c->role > p->p_roles.nprim)
 930                 return 0;
 931
 932         if (!c->user || c->user > p->p_users.nprim)
 933                 return 0;
 934
 935         if (!c->type || c->type > p->p_types.nprim)
 936                 return 0;
 937
 938         if (c->role != OBJECT_R_VAL) {
 939                 /*
 940                  * Role must be authorized for the type.
 941                  */
 942                 role = p->role_val_to_struct[c->role - 1];
 943                 if (!ebitmap_get_bit(&role->types, c->type - 1))
 944                         /* role may not be associated with type */
 945                         return 0;
 946
 947                 /*
 948                  * User must be authorized for the role.
 949                  */
 950                 usrdatum = p->user_val_to_struct[c->user - 1];
 951                 if (!usrdatum)
 952                         return 0;
 953
 954                 if (!ebitmap_get_bit(&usrdatum->roles, c->role - 1))
 955                         /* user may not be associated with role */
 956                         return 0;
 957         }
 958
 959         if (!mls_context_isvalid(p, c))
 960                 return 0;
 961
 962         return 1;
 963 }
 964
 965 /*
 966  * Read a MLS range structure from a policydb binary
 967  * representation file.
 968  */
 969 static int mls_read_range_helper(struct mls_range *r, void *fp)
 970 {
 971         __le32 buf[2];
 972         u32 items;
 973         int rc;
 974
 975         rc = next_entry(buf, fp, sizeof(u32));
 976         if (rc)
 977                 goto out;
 978
 979         rc = -EINVAL;
 980         items = le32_to_cpu(buf[0]);
 981         if (items > ARRAY_SIZE(buf)) {
 982                 printk(KERN_ERR "SELinux: mls:  range overflow\n");
 983                 goto out;
 984         }
 985
 986         rc = next_entry(buf, fp, sizeof(u32) * items);
 987         if (rc) {
 988                 printk(KERN_ERR "SELinux: mls:  truncated range\n");
 989                 goto out;
 990         }
 991
 992         r->level[0].sens = le32_to_cpu(buf[0]);
 993         if (items > 1)
 994                 r->level[1].sens = le32_to_cpu(buf[1]);
 995         else
 996                 r->level[1].sens = r->level[0].sens;
 997
 998         rc = ebitmap_read(&r->level[0].cat, fp);
 999         if (rc) {
1000                 printk(KERN_ERR "SELinux: mls:  error reading low categories\n");
1001                 goto out;
1002         }
1003         if (items > 1) {
1004                 rc = ebitmap_read(&r->level[1].cat, fp);
1005                 if (rc) {
1006                         printk(KERN_ERR "SELinux: mls:  error reading high categories\n");
1007                         goto bad_high;
1008                 }
1009         } else {
1010                 rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat);
1011                 if (rc) {
1012                         printk(KERN_ERR "SELinux: mls:  out of memory\n");
1013                         goto bad_high;
1014                 }
1015         }
1016
1017         return 0;
1018 bad_high:
1019         ebitmap_destroy(&r->level[0].cat);
1020 out:
1021         return rc;
1022 }
1023
1024 /*
1025  * Read and validate a security context structure
1026  * from a policydb binary representation file.
1027  */
1028 static int context_read_and_validate(struct context *c,
1029                                      struct policydb *p,
1030                                      void *fp)
1031 {
1032         __le32 buf[3];
1033         int rc;
1034
1035         rc = next_entry(buf, fp, sizeof buf);
1036         if (rc) {
1037                 printk(KERN_ERR "SELinux: context truncated\n");
1038                 goto out;
1039         }
1040         c->user = le32_to_cpu(buf[0]);
1041         c->role = le32_to_cpu(buf[1]);
1042         c->type = le32_to_cpu(buf[2]);
1043         if (p->policyvers >= POLICYDB_VERSION_MLS) {
1044                 rc = mls_read_range_helper(&c->range, fp);
1045                 if (rc) {
1046                         printk(KERN_ERR "SELinux: error reading MLS range of context\n");
1047                         goto out;
1048                 }
1049         }
1050
1051         rc = -EINVAL;
1052         if (!policydb_context_isvalid(p, c)) {
1053                 printk(KERN_ERR "SELinux:  invalid security context\n");
1054                 context_destroy(c);
1055                 goto out;
1056         }
1057         rc = 0;
1058 out:
1059         return rc;
1060 }
1061
1062 /*
1063  * The following *_read functions are used to
1064  * read the symbol data from a policy database
1065  * binary representation file.
1066  */
1067
1068 static int perm_read(struct policydb *p, struct hashtab *h, void *fp)
1069 {
1070         char *key = NULL;
1071         struct perm_datum *perdatum;
1072         int rc;
1073         __le32 buf[2];
1074         u32 len;
1075
1076         rc = -ENOMEM;
1077         perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
1078         if (!perdatum)
1079                 goto bad;
1080
1081         rc = next_entry(buf, fp, sizeof buf);
1082         if (rc)
1083                 goto bad;
1084
1085         len = le32_to_cpu(buf[0]);
1086         perdatum->value = le32_to_cpu(buf[1]);
1087
1088         rc = -ENOMEM;
1089         key = kmalloc(len + 1, GFP_KERNEL);
1090         if (!key)
1091                 goto bad;
1092
1093         rc = next_entry(key, fp, len);
1094         if (rc)
1095                 goto bad;
1096         key[len] = '\0';
1097
1098         rc = hashtab_insert(h, key, perdatum);
1099         if (rc)
1100                 goto bad;
1101
1102         return 0;
1103 bad:
1104         perm_destroy(key, perdatum, NULL);
1105         return rc;
1106 }
1107
1108 static int common_read(struct policydb *p, struct hashtab *h, void *fp)
1109 {
1110         char *key = NULL;
1111         struct common_datum *comdatum;
1112         __le32 buf[4];
1113         u32 len, nel;
1114         int i, rc;
1115
1116         rc = -ENOMEM;
1117         comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
1118         if (!comdatum)
1119                 goto bad;
1120
1121         rc = next_entry(buf, fp, sizeof buf);
1122         if (rc)
1123                 goto bad;
1124
1125         len = le32_to_cpu(buf[0]);
1126         comdatum->value = le32_to_cpu(buf[1]);
1127
1128         rc = symtab_init(&comdatum->permissions, PERM_SYMTAB_SIZE);
1129         if (rc)
1130                 goto bad;
1131         comdatum->permissions.nprim = le32_to_cpu(buf[2]);
1132         nel = le32_to_cpu(buf[3]);
1133
1134         rc = -ENOMEM;
1135         key = kmalloc(len + 1, GFP_KERNEL);
1136         if (!key)
1137                 goto bad;
1138
1139         rc = next_entry(key, fp, len);
1140         if (rc)
1141                 goto bad;
1142         key[len] = '\0';
1143
1144         for (i = 0; i < nel; i++) {
1145                 rc = perm_read(p, comdatum->permissions.table, fp);
1146                 if (rc)
1147                         goto bad;
1148         }
1149
1150         rc = hashtab_insert(h, key, comdatum);
1151         if (rc)
1152                 goto bad;
1153         return 0;
1154 bad:
1155         common_destroy(key, comdatum, NULL);
1156         return rc;
1157 }
1158
1159 static int read_cons_helper(struct constraint_node **nodep, int ncons,
1160                             int allowxtarget, void *fp)
1161 {
1162         struct constraint_node *c, *lc;
1163         struct constraint_expr *e, *le;
1164         __le32 buf[3];
1165         u32 nexpr;
1166         int rc, i, j, depth;
1167
1168         lc = NULL;
1169         for (i = 0; i < ncons; i++) {
1170                 c = kzalloc(sizeof(*c), GFP_KERNEL);
1171                 if (!c)
1172                         return -ENOMEM;
1173
1174                 if (lc)
1175                         lc->next = c;
1176                 else
1177                         *nodep = c;
1178
1179                 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1180                 if (rc)
1181                         return rc;
1182                 c->permissions = le32_to_cpu(buf[0]);
1183                 nexpr = le32_to_cpu(buf[1]);
1184                 le = NULL;
1185                 depth = -1;
1186                 for (j = 0; j < nexpr; j++) {
1187                         e = kzalloc(sizeof(*e), GFP_KERNEL);
1188                         if (!e)
1189                                 return -ENOMEM;
1190
1191                         if (le)
1192                                 le->next = e;
1193                         else
1194                                 c->expr = e;
1195
1196                         rc = next_entry(buf, fp, (sizeof(u32) * 3));
1197                         if (rc)
1198                                 return rc;
1199                         e->expr_type = le32_to_cpu(buf[0]);
1200                         e->attr = le32_to_cpu(buf[1]);
1201                         e->op = le32_to_cpu(buf[2]);
1202
1203                         switch (e->expr_type) {
1204                         case CEXPR_NOT:
1205                                 if (depth < 0)
1206                                         return -EINVAL;
1207                                 break;
1208                         case CEXPR_AND:
1209                         case CEXPR_OR:
1210                                 if (depth < 1)
1211                                         return -EINVAL;
1212                                 depth--;
1213                                 break;
1214                         case CEXPR_ATTR:
1215                                 if (depth == (CEXPR_MAXDEPTH - 1))
1216                                         return -EINVAL;
1217                                 depth++;
1218                                 break;
1219                         case CEXPR_NAMES:
1220                                 if (!allowxtarget && (e->attr & CEXPR_XTARGET))
1221                                         return -EINVAL;
1222                                 if (depth == (CEXPR_MAXDEPTH - 1))
1223                                         return -EINVAL;
1224                                 depth++;
1225                                 rc = ebitmap_read(&e->names, fp);
1226                                 if (rc)
1227                                         return rc;
1228                                 break;
1229                         default:
1230                                 return -EINVAL;
1231                         }
1232                         le = e;
1233                 }
1234                 if (depth != 0)
1235                         return -EINVAL;
1236                 lc = c;
1237         }
1238
1239         return 0;
1240 }
1241
1242 static int class_read(struct policydb *p, struct hashtab *h, void *fp)
1243 {
1244         char *key = NULL;
1245         struct class_datum *cladatum;
1246         __le32 buf[6];
1247         u32 len, len2, ncons, nel;
1248         int i, rc;
1249
1250         rc = -ENOMEM;
1251         cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
1252         if (!cladatum)
1253                 goto bad;
1254
1255         rc = next_entry(buf, fp, sizeof(u32)*6);
1256         if (rc)
1257                 goto bad;
1258
1259         len = le32_to_cpu(buf[0]);
1260         len2 = le32_to_cpu(buf[1]);
1261         cladatum->value = le32_to_cpu(buf[2]);
1262
1263         rc = symtab_init(&cladatum->permissions, PERM_SYMTAB_SIZE);
1264         if (rc)
1265                 goto bad;
1266         cladatum->permissions.nprim = le32_to_cpu(buf[3]);
1267         nel = le32_to_cpu(buf[4]);
1268
1269         ncons = le32_to_cpu(buf[5]);
1270
1271         rc = -ENOMEM;
1272         key = kmalloc(len + 1, GFP_KERNEL);
1273         if (!key)
1274                 goto bad;
1275
1276         rc = next_entry(key, fp, len);
1277         if (rc)
1278                 goto bad;
1279         key[len] = '\0';
1280
1281         if (len2) {
1282                 rc = -ENOMEM;
1283                 cladatum->comkey = kmalloc(len2 + 1, GFP_KERNEL);
1284                 if (!cladatum->comkey)
1285                         goto bad;
1286                 rc = next_entry(cladatum->comkey, fp, len2);
1287                 if (rc)
1288                         goto bad;
1289                 cladatum->comkey[len2] = '\0';
1290
1291                 rc = -EINVAL;
1292                 cladatum->comdatum = hashtab_search(p->p_commons.table, cladatum->comkey);
1293                 if (!cladatum->comdatum) {
1294                         printk(KERN_ERR "SELinux:  unknown common %s\n", cladatum->comkey);
1295                         goto bad;
1296                 }
1297         }
1298         for (i = 0; i < nel; i++) {
1299                 rc = perm_read(p, cladatum->permissions.table, fp);
1300                 if (rc)
1301                         goto bad;
1302         }
1303
1304         rc = read_cons_helper(&cladatum->constraints, ncons, 0, fp);
1305         if (rc)
1306                 goto bad;
1307
1308         if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
1309                 /* grab the validatetrans rules */
1310                 rc = next_entry(buf, fp, sizeof(u32));
1311                 if (rc)
1312                         goto bad;
1313                 ncons = le32_to_cpu(buf[0]);
1314                 rc = read_cons_helper(&cladatum->validatetrans, ncons, 1, fp);
1315                 if (rc)
1316                         goto bad;
1317         }
1318
1319         if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
1320                 rc = next_entry(buf, fp, sizeof(u32) * 3);
1321                 if (rc)
1322                         goto bad;
1323
1324                 cladatum->default_user = le32_to_cpu(buf[0]);
1325                 cladatum->default_role = le32_to_cpu(buf[1]);
1326                 cladatum->default_range = le32_to_cpu(buf[2]);
1327         }
1328
1329         if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
1330                 rc = next_entry(buf, fp, sizeof(u32) * 1);
1331                 if (rc)
1332                         goto bad;
1333                 cladatum->default_type = le32_to_cpu(buf[0]);
1334         }
1335
1336         rc = hashtab_insert(h, key, cladatum);
1337         if (rc)
1338                 goto bad;
1339
1340         return 0;
1341 bad:
1342         cls_destroy(key, cladatum, NULL);
1343         return rc;
1344 }
1345
1346 static int role_read(struct policydb *p, struct hashtab *h, void *fp)
1347 {
1348         char *key = NULL;
1349         struct role_datum *role;
1350         int rc, to_read = 2;
1351         __le32 buf[3];
1352         u32 len;
1353
1354         rc = -ENOMEM;
1355         role = kzalloc(sizeof(*role), GFP_KERNEL);
1356         if (!role)
1357                 goto bad;
1358
1359         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1360                 to_read = 3;
1361
1362         rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1363         if (rc)
1364                 goto bad;
1365
1366         len = le32_to_cpu(buf[0]);
1367         role->value = le32_to_cpu(buf[1]);
1368         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1369                 role->bounds = le32_to_cpu(buf[2]);
1370
1371         rc = -ENOMEM;
1372         key = kmalloc(len + 1, GFP_KERNEL);
1373         if (!key)
1374                 goto bad;
1375
1376         rc = next_entry(key, fp, len);
1377         if (rc)
1378                 goto bad;
1379         key[len] = '\0';
1380
1381         rc = ebitmap_read(&role->dominates, fp);
1382         if (rc)
1383                 goto bad;
1384
1385         rc = ebitmap_read(&role->types, fp);
1386         if (rc)
1387                 goto bad;
1388
1389         if (strcmp(key, OBJECT_R) == 0) {
1390                 rc = -EINVAL;
1391                 if (role->value != OBJECT_R_VAL) {
1392                         printk(KERN_ERR "SELinux: Role %s has wrong value %d\n",
1393                                OBJECT_R, role->value);
1394                         goto bad;
1395                 }
1396                 rc = 0;
1397                 goto bad;
1398         }
1399
1400         rc = hashtab_insert(h, key, role);
1401         if (rc)
1402                 goto bad;
1403         return 0;
1404 bad:
1405         role_destroy(key, role, NULL);
1406         return rc;
1407 }
1408
1409 static int type_read(struct policydb *p, struct hashtab *h, void *fp)
1410 {
1411         char *key = NULL;
1412         struct type_datum *typdatum;
1413         int rc, to_read = 3;
1414         __le32 buf[4];
1415         u32 len;
1416
1417         rc = -ENOMEM;
1418         typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL);
1419         if (!typdatum)
1420                 goto bad;
1421
1422         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1423                 to_read = 4;
1424
1425         rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1426         if (rc)
1427                 goto bad;
1428
1429         len = le32_to_cpu(buf[0]);
1430         typdatum->value = le32_to_cpu(buf[1]);
1431         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
1432                 u32 prop = le32_to_cpu(buf[2]);
1433
1434                 if (prop & TYPEDATUM_PROPERTY_PRIMARY)
1435                         typdatum->primary = 1;
1436                 if (prop & TYPEDATUM_PROPERTY_ATTRIBUTE)
1437                         typdatum->attribute = 1;
1438
1439                 typdatum->bounds = le32_to_cpu(buf[3]);
1440         } else {
1441                 typdatum->primary = le32_to_cpu(buf[2]);
1442         }
1443
1444         rc = -ENOMEM;
1445         key = kmalloc(len + 1, GFP_KERNEL);
1446         if (!key)
1447                 goto bad;
1448         rc = next_entry(key, fp, len);
1449         if (rc)
1450                 goto bad;
1451         key[len] = '\0';
1452
1453         rc = hashtab_insert(h, key, typdatum);
1454         if (rc)
1455                 goto bad;
1456         return 0;
1457 bad:
1458         type_destroy(key, typdatum, NULL);
1459         return rc;
1460 }
1461
1462
1463 /*
1464  * Read a MLS level structure from a policydb binary
1465  * representation file.
1466  */
1467 static int mls_read_level(struct mls_level *lp, void *fp)
1468 {
1469         __le32 buf[1];
1470         int rc;
1471
1472         memset(lp, 0, sizeof(*lp));
1473
1474         rc = next_entry(buf, fp, sizeof buf);
1475         if (rc) {
1476                 printk(KERN_ERR "SELinux: mls: truncated level\n");
1477                 return rc;
1478         }
1479         lp->sens = le32_to_cpu(buf[0]);
1480
1481         rc = ebitmap_read(&lp->cat, fp);
1482         if (rc) {
1483                 printk(KERN_ERR "SELinux: mls:  error reading level categories\n");
1484                 return rc;
1485         }
1486         return 0;
1487 }
1488
1489 static int user_read(struct policydb *p, struct hashtab *h, void *fp)
1490 {
1491         char *key = NULL;
1492         struct user_datum *usrdatum;
1493         int rc, to_read = 2;
1494         __le32 buf[3];
1495         u32 len;
1496
1497         rc = -ENOMEM;
1498         usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
1499         if (!usrdatum)
1500                 goto bad;
1501
1502         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1503                 to_read = 3;
1504
1505         rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1506         if (rc)
1507                 goto bad;
1508
1509         len = le32_to_cpu(buf[0]);
1510         usrdatum->value = le32_to_cpu(buf[1]);
1511         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1512                 usrdatum->bounds = le32_to_cpu(buf[2]);
1513
1514         rc = -ENOMEM;
1515         key = kmalloc(len + 1, GFP_KERNEL);
1516         if (!key)
1517                 goto bad;
1518         rc = next_entry(key, fp, len);
1519         if (rc)
1520                 goto bad;
1521         key[len] = '\0';
1522
1523         rc = ebitmap_read(&usrdatum->roles, fp);
1524         if (rc)
1525                 goto bad;
1526
1527         if (p->policyvers >= POLICYDB_VERSION_MLS) {
1528                 rc = mls_read_range_helper(&usrdatum->range, fp);
1529                 if (rc)
1530                         goto bad;
1531                 rc = mls_read_level(&usrdatum->dfltlevel, fp);
1532                 if (rc)
1533                         goto bad;
1534         }
1535
1536         rc = hashtab_insert(h, key, usrdatum);
1537         if (rc)
1538                 goto bad;
1539         return 0;
1540 bad:
1541         user_destroy(key, usrdatum, NULL);
1542         return rc;
1543 }
1544
1545 static int sens_read(struct policydb *p, struct hashtab *h, void *fp)
1546 {
1547         char *key = NULL;
1548         struct level_datum *levdatum;
1549         int rc;
1550         __le32 buf[2];
1551         u32 len;
1552
1553         rc = -ENOMEM;
1554         levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC);
1555         if (!levdatum)
1556                 goto bad;
1557
1558         rc = next_entry(buf, fp, sizeof buf);
1559         if (rc)
1560                 goto bad;
1561
1562         len = le32_to_cpu(buf[0]);
1563         levdatum->isalias = le32_to_cpu(buf[1]);
1564
1565         rc = -ENOMEM;
1566         key = kmalloc(len + 1, GFP_ATOMIC);
1567         if (!key)
1568                 goto bad;
1569         rc = next_entry(key, fp, len);
1570         if (rc)
1571                 goto bad;
1572         key[len] = '\0';
1573
1574         rc = -ENOMEM;
1575         levdatum->level = kmalloc(sizeof(struct mls_level), GFP_ATOMIC);
1576         if (!levdatum->level)
1577                 goto bad;
1578
1579         rc = mls_read_level(levdatum->level, fp);
1580         if (rc)
1581                 goto bad;
1582
1583         rc = hashtab_insert(h, key, levdatum);
1584         if (rc)
1585                 goto bad;
1586         return 0;
1587 bad:
1588         sens_destroy(key, levdatum, NULL);
1589         return rc;
1590 }
1591
1592 static int cat_read(struct policydb *p, struct hashtab *h, void *fp)
1593 {
1594         char *key = NULL;
1595         struct cat_datum *catdatum;
1596         int rc;
1597         __le32 buf[3];
1598         u32 len;
1599
1600         rc = -ENOMEM;
1601         catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC);
1602         if (!catdatum)
1603                 goto bad;
1604
1605         rc = next_entry(buf, fp, sizeof buf);
1606         if (rc)
1607                 goto bad;
1608
1609         len = le32_to_cpu(buf[0]);
1610         catdatum->value = le32_to_cpu(buf[1]);
1611         catdatum->isalias = le32_to_cpu(buf[2]);
1612
1613         rc = -ENOMEM;
1614         key = kmalloc(len + 1, GFP_ATOMIC);
1615         if (!key)
1616                 goto bad;
1617         rc = next_entry(key, fp, len);
1618         if (rc)
1619                 goto bad;
1620         key[len] = '\0';
1621
1622         rc = hashtab_insert(h, key, catdatum);
1623         if (rc)
1624                 goto bad;
1625         return 0;
1626 bad:
1627         cat_destroy(key, catdatum, NULL);
1628         return rc;
1629 }
1630
1631 static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, void *fp) =
1632 {
1633         common_read,
1634         class_read,
1635         role_read,
1636         type_read,
1637         user_read,
1638         cond_read_bool,
1639         sens_read,
1640         cat_read,
1641 };
1642
1643 static int user_bounds_sanity_check(void *key, void *datum, void *datap)
1644 {
1645         struct user_datum *upper, *user;
1646         struct policydb *p = datap;
1647         int depth = 0;
1648
1649         upper = user = datum;
1650         while (upper->bounds) {
1651                 struct ebitmap_node *node;
1652                 unsigned long bit;
1653
1654                 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1655                         printk(KERN_ERR "SELinux: user %s: "
1656                                "too deep or looped boundary",
1657                                (char *) key);
1658                         return -EINVAL;
1659                 }
1660
1661                 upper = p->user_val_to_struct[upper->bounds - 1];
1662                 ebitmap_for_each_positive_bit(&user->roles, node, bit) {
1663                         if (ebitmap_get_bit(&upper->roles, bit))
1664                                 continue;
1665
1666                         printk(KERN_ERR
1667                                "SELinux: boundary violated policy: "
1668                                "user=%s role=%s bounds=%s\n",
1669                                sym_name(p, SYM_USERS, user->value - 1),
1670                                sym_name(p, SYM_ROLES, bit),
1671                                sym_name(p, SYM_USERS, upper->value - 1));
1672
1673                         return -EINVAL;
1674                 }
1675         }
1676
1677         return 0;
1678 }
1679
1680 static int role_bounds_sanity_check(void *key, void *datum, void *datap)
1681 {
1682         struct role_datum *upper, *role;
1683         struct policydb *p = datap;
1684         int depth = 0;
1685
1686         upper = role = datum;
1687         while (upper->bounds) {
1688                 struct ebitmap_node *node;
1689                 unsigned long bit;
1690
1691                 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1692                         printk(KERN_ERR "SELinux: role %s: "
1693                                "too deep or looped bounds\n",
1694                                (char *) key);
1695                         return -EINVAL;
1696                 }
1697
1698                 upper = p->role_val_to_struct[upper->bounds - 1];
1699                 ebitmap_for_each_positive_bit(&role->types, node, bit) {
1700                         if (ebitmap_get_bit(&upper->types, bit))
1701                                 continue;
1702
1703                         printk(KERN_ERR
1704                                "SELinux: boundary violated policy: "
1705                                "role=%s type=%s bounds=%s\n",
1706                                sym_name(p, SYM_ROLES, role->value - 1),
1707                                sym_name(p, SYM_TYPES, bit),
1708                                sym_name(p, SYM_ROLES, upper->value - 1));
1709
1710                         return -EINVAL;
1711                 }
1712         }
1713
1714         return 0;
1715 }
1716
1717 static int type_bounds_sanity_check(void *key, void *datum, void *datap)
1718 {
1719         struct type_datum *upper;
1720         struct policydb *p = datap;
1721         int depth = 0;
1722
1723         upper = datum;
1724         while (upper->bounds) {
1725                 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1726                         printk(KERN_ERR "SELinux: type %s: "
1727                                "too deep or looped boundary\n",
1728                                (char *) key);
1729                         return -EINVAL;
1730                 }
1731
1732                 upper = flex_array_get_ptr(p->type_val_to_struct_array,
1733                                            upper->bounds - 1);
1734                 BUG_ON(!upper);
1735
1736                 if (upper->attribute) {
1737                         printk(KERN_ERR "SELinux: type %s: "
1738                                "bounded by attribute %s",
1739                                (char *) key,
1740                                sym_name(p, SYM_TYPES, upper->value - 1));
1741                         return -EINVAL;
1742                 }
1743         }
1744
1745         return 0;
1746 }
1747
1748 static int policydb_bounds_sanity_check(struct policydb *p)
1749 {
1750         int rc;
1751
1752         if (p->policyvers < POLICYDB_VERSION_BOUNDARY)
1753                 return 0;
1754
1755         rc = hashtab_map(p->p_users.table,
1756                          user_bounds_sanity_check, p);
1757         if (rc)
1758                 return rc;
1759
1760         rc = hashtab_map(p->p_roles.table,
1761                          role_bounds_sanity_check, p);
1762         if (rc)
1763                 return rc;
1764
1765         rc = hashtab_map(p->p_types.table,
1766                          type_bounds_sanity_check, p);
1767         if (rc)
1768                 return rc;
1769
1770         return 0;
1771 }
1772
1773 u16 string_to_security_class(struct policydb *p, const char *name)
1774 {
1775         struct class_datum *cladatum;
1776
1777         cladatum = hashtab_search(p->p_classes.table, name);
1778         if (!cladatum)
1779                 return 0;
1780
1781         return cladatum->value;
1782 }
1783
1784 u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name)
1785 {
1786         struct class_datum *cladatum;
1787         struct perm_datum *perdatum = NULL;
1788         struct common_datum *comdatum;
1789
1790         if (!tclass || tclass > p->p_classes.nprim)
1791                 return 0;
1792
1793         cladatum = p->class_val_to_struct[tclass-1];
1794         comdatum = cladatum->comdatum;
1795         if (comdatum)
1796                 perdatum = hashtab_search(comdatum->permissions.table,
1797                                           name);
1798         if (!perdatum)
1799                 perdatum = hashtab_search(cladatum->permissions.table,
1800                                           name);
1801         if (!perdatum)
1802                 return 0;
1803
1804         return 1U << (perdatum->value-1);
1805 }
1806
1807 static int range_read(struct policydb *p, void *fp)
1808 {
1809         struct range_trans *rt = NULL;
1810         struct mls_range *r = NULL;
1811         int i, rc;
1812         __le32 buf[2];
1813         u32 nel;
1814
1815         if (p->policyvers < POLICYDB_VERSION_MLS)
1816                 return 0;
1817
1818         rc = next_entry(buf, fp, sizeof(u32));
1819         if (rc)
1820                 goto out;
1821
1822         nel = le32_to_cpu(buf[0]);
1823         for (i = 0; i < nel; i++) {
1824                 rc = -ENOMEM;
1825                 rt = kzalloc(sizeof(*rt), GFP_KERNEL);
1826                 if (!rt)
1827                         goto out;
1828
1829                 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1830                 if (rc)
1831                         goto out;
1832
1833                 rt->source_type = le32_to_cpu(buf[0]);
1834                 rt->target_type = le32_to_cpu(buf[1]);
1835                 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
1836                         rc = next_entry(buf, fp, sizeof(u32));
1837                         if (rc)
1838                                 goto out;
1839                         rt->target_class = le32_to_cpu(buf[0]);
1840                 } else
1841                         rt->target_class = p->process_class;
1842
1843                 rc = -EINVAL;
1844                 if (!policydb_type_isvalid(p, rt->source_type) ||
1845                     !policydb_type_isvalid(p, rt->target_type) ||
1846                     !policydb_class_isvalid(p, rt->target_class))
1847                         goto out;
1848
1849                 rc = -ENOMEM;
1850                 r = kzalloc(sizeof(*r), GFP_KERNEL);
1851                 if (!r)
1852                         goto out;
1853
1854                 rc = mls_read_range_helper(r, fp);
1855                 if (rc)
1856                         goto out;
1857
1858                 rc = -EINVAL;
1859                 if (!mls_range_isvalid(p, r)) {
1860                         printk(KERN_WARNING "SELinux:  rangetrans:  invalid range\n");
1861                         goto out;
1862                 }
1863
1864                 rc = hashtab_insert(p->range_tr, rt, r);
1865                 if (rc)
1866                         goto out;
1867
1868                 rt = NULL;
1869                 r = NULL;
1870         }
1871         hash_eval(p->range_tr, "rangetr");
1872         rc = 0;
1873 out:
1874         kfree(rt);
1875         kfree(r);
1876         return rc;
1877 }
1878
1879 static int filename_trans_read(struct policydb *p, void *fp)
1880 {
1881         struct filename_trans *ft;
1882         struct filename_trans_datum *otype;
1883         char *name;
1884         u32 nel, len;
1885         __le32 buf[4];
1886         int rc, i;
1887
1888         if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
1889                 return 0;
1890
1891         rc = next_entry(buf, fp, sizeof(u32));
1892         if (rc)
1893                 return rc;
1894         nel = le32_to_cpu(buf[0]);
1895
1896         for (i = 0; i < nel; i++) {
1897                 ft = NULL;
1898                 otype = NULL;
1899                 name = NULL;
1900
1901                 rc = -ENOMEM;
1902                 ft = kzalloc(sizeof(*ft), GFP_KERNEL);
1903                 if (!ft)
1904                         goto out;
1905
1906                 rc = -ENOMEM;
1907                 otype = kmalloc(sizeof(*otype), GFP_KERNEL);
1908                 if (!otype)
1909                         goto out;
1910
1911                 /* length of the path component string */
1912                 rc = next_entry(buf, fp, sizeof(u32));
1913                 if (rc)
1914                         goto out;
1915                 len = le32_to_cpu(buf[0]);
1916
1917                 rc = -ENOMEM;
1918                 name = kmalloc(len + 1, GFP_KERNEL);
1919                 if (!name)
1920                         goto out;
1921
1922                 ft->name = name;
1923
1924                 /* path component string */
1925                 rc = next_entry(name, fp, len);
1926                 if (rc)
1927                         goto out;
1928                 name[len] = 0;
1929
1930                 rc = next_entry(buf, fp, sizeof(u32) * 4);
1931                 if (rc)
1932                         goto out;
1933
1934                 ft->stype = le32_to_cpu(buf[0]);
1935                 ft->ttype = le32_to_cpu(buf[1]);
1936                 ft->tclass = le32_to_cpu(buf[2]);
1937
1938                 otype->otype = le32_to_cpu(buf[3]);
1939
1940                 rc = ebitmap_set_bit(&p->filename_trans_ttypes, ft->ttype, 1);
1941                 if (rc)
1942                         goto out;
1943
1944                 hashtab_insert(p->filename_trans, ft, otype);
1945         }
1946         hash_eval(p->filename_trans, "filenametr");
1947         return 0;
1948 out:
1949         kfree(ft);
1950         kfree(name);
1951         kfree(otype);
1952
1953         return rc;
1954 }
1955
1956 static int genfs_read(struct policydb *p, void *fp)
1957 {
1958         int i, j, rc;
1959         u32 nel, nel2, len, len2;
1960         __le32 buf[1];
1961         struct ocontext *l, *c;
1962         struct ocontext *newc = NULL;
1963         struct genfs *genfs_p, *genfs;
1964         struct genfs *newgenfs = NULL;
1965
1966         rc = next_entry(buf, fp, sizeof(u32));
1967         if (rc)
1968                 goto out;
1969         nel = le32_to_cpu(buf[0]);
1970
1971         for (i = 0; i < nel; i++) {
1972                 rc = next_entry(buf, fp, sizeof(u32));
1973                 if (rc)
1974                         goto out;
1975                 len = le32_to_cpu(buf[0]);
1976
1977                 rc = -ENOMEM;
1978                 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
1979                 if (!newgenfs)
1980                         goto out;
1981
1982                 rc = -ENOMEM;
1983                 newgenfs->fstype = kmalloc(len + 1, GFP_KERNEL);
1984                 if (!newgenfs->fstype)
1985                         goto out;
1986
1987                 rc = next_entry(newgenfs->fstype, fp, len);
1988                 if (rc)
1989                         goto out;
1990
1991                 newgenfs->fstype[len] = 0;
1992
1993                 for (genfs_p = NULL, genfs = p->genfs; genfs;
1994                      genfs_p = genfs, genfs = genfs->next) {
1995                         rc = -EINVAL;
1996                         if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
1997                                 printk(KERN_ERR "SELinux:  dup genfs fstype %s\n",
1998                                        newgenfs->fstype);
1999                                 goto out;
2000                         }
2001                         if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
2002                                 break;
2003                 }
2004                 newgenfs->next = genfs;
2005                 if (genfs_p)
2006                         genfs_p->next = newgenfs;
2007                 else
2008                         p->genfs = newgenfs;
2009                 genfs = newgenfs;
2010                 newgenfs = NULL;
2011
2012                 rc = next_entry(buf, fp, sizeof(u32));
2013                 if (rc)
2014                         goto out;
2015
2016                 nel2 = le32_to_cpu(buf[0]);
2017                 for (j = 0; j < nel2; j++) {
2018                         rc = next_entry(buf, fp, sizeof(u32));
2019                         if (rc)
2020                                 goto out;
2021                         len = le32_to_cpu(buf[0]);
2022
2023                         rc = -ENOMEM;
2024                         newc = kzalloc(sizeof(*newc), GFP_KERNEL);
2025                         if (!newc)
2026                                 goto out;
2027
2028                         rc = -ENOMEM;
2029                         newc->u.name = kmalloc(len + 1, GFP_KERNEL);
2030                         if (!newc->u.name)
2031                                 goto out;
2032
2033                         rc = next_entry(newc->u.name, fp, len);
2034                         if (rc)
2035                                 goto out;
2036                         newc->u.name[len] = 0;
2037
2038                         rc = next_entry(buf, fp, sizeof(u32));
2039                         if (rc)
2040                                 goto out;
2041
2042                         newc->v.sclass = le32_to_cpu(buf[0]);
2043                         rc = context_read_and_validate(&newc->context[0], p, fp);
2044                         if (rc)
2045                                 goto out;
2046
2047                         for (l = NULL, c = genfs->head; c;
2048                              l = c, c = c->next) {
2049                                 rc = -EINVAL;
2050                                 if (!strcmp(newc->u.name, c->u.name) &&
2051                                     (!c->v.sclass || !newc->v.sclass ||
2052                                      newc->v.sclass == c->v.sclass)) {
2053                                         printk(KERN_ERR "SELinux:  dup genfs entry (%s,%s)\n",
2054                                                genfs->fstype, c->u.name);
2055                                         goto out;
2056                                 }
2057                                 len = strlen(newc->u.name);
2058                                 len2 = strlen(c->u.name);
2059                                 if (len > len2)
2060                                         break;
2061                         }
2062
2063                         newc->next = c;
2064                         if (l)
2065                                 l->next = newc;
2066                         else
2067                                 genfs->head = newc;
2068                         newc = NULL;
2069                 }
2070         }
2071         rc = 0;
2072 out:
2073         if (newgenfs)
2074                 kfree(newgenfs->fstype);
2075         kfree(newgenfs);
2076         ocontext_destroy(newc, OCON_FSUSE);
2077
2078         return rc;
2079 }
2080
2081 static int ocontext_read(struct policydb *p, struct policydb_compat_info *info,
2082                          void *fp)
2083 {
2084         int i, j, rc;
2085         u32 nel, len;
2086         __le32 buf[3];
2087         struct ocontext *l, *c;
2088         u32 nodebuf[8];
2089
2090         for (i = 0; i < info->ocon_num; i++) {
2091                 rc = next_entry(buf, fp, sizeof(u32));
2092                 if (rc)
2093                         goto out;
2094                 nel = le32_to_cpu(buf[0]);
2095
2096                 l = NULL;
2097                 for (j = 0; j < nel; j++) {
2098                         rc = -ENOMEM;
2099                         c = kzalloc(sizeof(*c), GFP_KERNEL);
2100                         if (!c)
2101                                 goto out;
2102                         if (l)
2103                                 l->next = c;
2104                         else
2105                                 p->ocontexts[i] = c;
2106                         l = c;
2107
2108                         switch (i) {
2109                         case OCON_ISID:
2110                                 rc = next_entry(buf, fp, sizeof(u32));
2111                                 if (rc)
2112                                         goto out;
2113
2114                                 c->sid[0] = le32_to_cpu(buf[0]);
2115                                 rc = context_read_and_validate(&c->context[0], p, fp);
2116                                 if (rc)
2117                                         goto out;
2118                                 break;
2119                         case OCON_FS:
2120                         case OCON_NETIF:
2121                                 rc = next_entry(buf, fp, sizeof(u32));
2122                                 if (rc)
2123                                         goto out;
2124                                 len = le32_to_cpu(buf[0]);
2125
2126                                 rc = -ENOMEM;
2127                                 c->u.name = kmalloc(len + 1, GFP_KERNEL);
2128                                 if (!c->u.name)
2129                                         goto out;
2130
2131                                 rc = next_entry(c->u.name, fp, len);
2132                                 if (rc)
2133                                         goto out;
2134
2135                                 c->u.name[len] = 0;
2136                                 rc = context_read_and_validate(&c->context[0], p, fp);
2137                                 if (rc)
2138                                         goto out;
2139                                 rc = context_read_and_validate(&c->context[1], p, fp);
2140                                 if (rc)
2141                                         goto out;
2142                                 break;
2143                         case OCON_PORT:
2144                                 rc = next_entry(buf, fp, sizeof(u32)*3);
2145                                 if (rc)
2146                                         goto out;
2147                                 c->u.port.protocol = le32_to_cpu(buf[0]);
2148                                 c->u.port.low_port = le32_to_cpu(buf[1]);
2149                                 c->u.port.high_port = le32_to_cpu(buf[2]);
2150                                 rc = context_read_and_validate(&c->context[0], p, fp);
2151                                 if (rc)
2152                                         goto out;
2153                                 break;
2154                         case OCON_NODE:
2155                                 rc = next_entry(nodebuf, fp, sizeof(u32) * 2);
2156                                 if (rc)
2157                                         goto out;
2158                                 c->u.node.addr = nodebuf[0]; /* network order */
2159                                 c->u.node.mask = nodebuf[1]; /* network order */
2160                                 rc = context_read_and_validate(&c->context[0], p, fp);
2161                                 if (rc)
2162                                         goto out;
2163                                 break;
2164                         case OCON_FSUSE:
2165                                 rc = next_entry(buf, fp, sizeof(u32)*2);
2166                                 if (rc)
2167                                         goto out;
2168
2169                                 rc = -EINVAL;
2170                                 c->v.behavior = le32_to_cpu(buf[0]);
2171                                 /* Determined at runtime, not in policy DB. */
2172                                 if (c->v.behavior == SECURITY_FS_USE_MNTPOINT)
2173                                         goto out;
2174                                 if (c->v.behavior > SECURITY_FS_USE_MAX)
2175                                         goto out;
2176
2177                                 rc = -ENOMEM;
2178                                 len = le32_to_cpu(buf[1]);
2179                                 c->u.name = kmalloc(len + 1, GFP_KERNEL);
2180                                 if (!c->u.name)
2181                                         goto out;
2182
2183                                 rc = next_entry(c->u.name, fp, len);
2184                                 if (rc)
2185                                         goto out;
2186                                 c->u.name[len] = 0;
2187                                 rc = context_read_and_validate(&c->context[0], p, fp);
2188                                 if (rc)
2189                                         goto out;
2190                                 break;
2191                         case OCON_NODE6: {
2192                                 int k;
2193
2194                                 rc = next_entry(nodebuf, fp, sizeof(u32) * 8);
2195                                 if (rc)
2196                                         goto out;
2197                                 for (k = 0; k < 4; k++)
2198                                         c->u.node6.addr[k] = nodebuf[k];
2199                                 for (k = 0; k < 4; k++)
2200                                         c->u.node6.mask[k] = nodebuf[k+4];
2201                                 rc = context_read_and_validate(&c->context[0], p, fp);
2202                                 if (rc)
2203                                         goto out;
2204                                 break;
2205                         }
2206                         }
2207                 }
2208         }
2209         rc = 0;
2210 out:
2211         return rc;
2212 }
2213
2214 /*
2215  * Read the configuration data from a policy database binary
2216  * representation file into a policy database structure.
2217  */
2218 int policydb_read(struct policydb *p, void *fp)
2219 {
2220         struct role_allow *ra, *lra;
2221         struct role_trans *tr, *ltr;
2222         int i, j, rc;
2223         __le32 buf[4];
2224         u32 len, nprim, nel;
2225
2226         char *policydb_str;
2227         struct policydb_compat_info *info;
2228
2229         rc = policydb_init(p);
2230         if (rc)
2231                 return rc;
2232
2233         /* Read the magic number and string length. */
2234         rc = next_entry(buf, fp, sizeof(u32) * 2);
2235         if (rc)
2236                 goto bad;
2237
2238         rc = -EINVAL;
2239         if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
2240                 printk(KERN_ERR "SELinux:  policydb magic number 0x%x does "
2241                        "not match expected magic number 0x%x\n",
2242                        le32_to_cpu(buf[0]), POLICYDB_MAGIC);
2243                 goto bad;
2244         }
2245
2246         rc = -EINVAL;
2247         len = le32_to_cpu(buf[1]);
2248         if (len != strlen(POLICYDB_STRING)) {
2249                 printk(KERN_ERR "SELinux:  policydb string length %d does not "
2250                        "match expected length %Zu\n",
2251                        len, strlen(POLICYDB_STRING));
2252                 goto bad;
2253         }
2254
2255         rc = -ENOMEM;
2256         policydb_str = kmalloc(len + 1, GFP_KERNEL);
2257         if (!policydb_str) {
2258                 printk(KERN_ERR "SELinux:  unable to allocate memory for policydb "
2259                        "string of length %d\n", len);
2260                 goto bad;
2261         }
2262
2263         rc = next_entry(policydb_str, fp, len);
2264         if (rc) {
2265                 printk(KERN_ERR "SELinux:  truncated policydb string identifier\n");
2266                 kfree(policydb_str);
2267                 goto bad;
2268         }
2269
2270         rc = -EINVAL;
2271         policydb_str[len] = '\0';
2272         if (strcmp(policydb_str, POLICYDB_STRING)) {
2273                 printk(KERN_ERR "SELinux:  policydb string %s does not match "
2274                        "my string %s\n", policydb_str, POLICYDB_STRING);
2275                 kfree(policydb_str);
2276                 goto bad;
2277         }
2278         /* Done with policydb_str. */
2279         kfree(policydb_str);
2280         policydb_str = NULL;
2281
2282         /* Read the version and table sizes. */
2283         rc = next_entry(buf, fp, sizeof(u32)*4);
2284         if (rc)
2285                 goto bad;
2286
2287         rc = -EINVAL;
2288         p->policyvers = le32_to_cpu(buf[0]);
2289         if (p->policyvers < POLICYDB_VERSION_MIN ||
2290             p->policyvers > POLICYDB_VERSION_MAX) {
2291                 printk(KERN_ERR "SELinux:  policydb version %d does not match "
2292                        "my version range %d-%d\n",
2293                        le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
2294                 goto bad;
2295         }
2296
2297         if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
2298                 p->mls_enabled = 1;
2299
2300                 rc = -EINVAL;
2301                 if (p->policyvers < POLICYDB_VERSION_MLS) {
2302                         printk(KERN_ERR "SELinux: security policydb version %d "
2303                                 "(MLS) not backwards compatible\n",
2304                                 p->policyvers);
2305                         goto bad;
2306                 }
2307         }
2308         p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
2309         p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
2310
2311         if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
2312                 rc = ebitmap_read(&p->policycaps, fp);
2313                 if (rc)
2314                         goto bad;
2315         }
2316
2317         if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
2318                 rc = ebitmap_read(&p->permissive_map, fp);
2319                 if (rc)
2320                         goto bad;
2321         }
2322
2323         rc = -EINVAL;
2324         info = policydb_lookup_compat(p->policyvers);
2325         if (!info) {
2326                 printk(KERN_ERR "SELinux:  unable to find policy compat info "
2327                        "for version %d\n", p->policyvers);
2328                 goto bad;
2329         }
2330
2331         rc = -EINVAL;
2332         if (le32_to_cpu(buf[2]) != info->sym_num ||
2333                 le32_to_cpu(buf[3]) != info->ocon_num) {
2334                 printk(KERN_ERR "SELinux:  policydb table sizes (%d,%d) do "
2335                        "not match mine (%d,%d)\n", le32_to_cpu(buf[2]),
2336                         le32_to_cpu(buf[3]),
2337                        info->sym_num, info->ocon_num);
2338                 goto bad;
2339         }
2340
2341         for (i = 0; i < info->sym_num; i++) {
2342                 rc = next_entry(buf, fp, sizeof(u32)*2);
2343                 if (rc)
2344                         goto bad;
2345                 nprim = le32_to_cpu(buf[0]);
2346                 nel = le32_to_cpu(buf[1]);
2347                 for (j = 0; j < nel; j++) {
2348                         rc = read_f[i](p, p->symtab[i].table, fp);
2349                         if (rc)
2350                                 goto bad;
2351                 }
2352
2353                 p->symtab[i].nprim = nprim;
2354         }
2355
2356         rc = -EINVAL;
2357         p->process_class = string_to_security_class(p, "process");
2358         if (!p->process_class)
2359                 goto bad;
2360
2361         rc = avtab_read(&p->te_avtab, fp, p);
2362         if (rc)
2363                 goto bad;
2364
2365         if (p->policyvers >= POLICYDB_VERSION_BOOL) {
2366                 rc = cond_read_list(p, fp);
2367                 if (rc)
2368                         goto bad;
2369         }
2370
2371         rc = next_entry(buf, fp, sizeof(u32));
2372         if (rc)
2373                 goto bad;
2374         nel = le32_to_cpu(buf[0]);
2375         ltr = NULL;
2376         for (i = 0; i < nel; i++) {
2377                 rc = -ENOMEM;
2378                 tr = kzalloc(sizeof(*tr), GFP_KERNEL);
2379                 if (!tr)
2380                         goto bad;
2381                 if (ltr)
2382                         ltr->next = tr;
2383                 else
2384                         p->role_tr = tr;
2385                 rc = next_entry(buf, fp, sizeof(u32)*3);
2386                 if (rc)
2387                         goto bad;
2388
2389                 rc = -EINVAL;
2390                 tr->role = le32_to_cpu(buf[0]);
2391                 tr->type = le32_to_cpu(buf[1]);
2392                 tr->new_role = le32_to_cpu(buf[2]);
2393                 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2394                         rc = next_entry(buf, fp, sizeof(u32));
2395                         if (rc)
2396                                 goto bad;
2397                         tr->tclass = le32_to_cpu(buf[0]);
2398                 } else
2399                         tr->tclass = p->process_class;
2400
2401                 if (!policydb_role_isvalid(p, tr->role) ||
2402                     !policydb_type_isvalid(p, tr->type) ||
2403                     !policydb_class_isvalid(p, tr->tclass) ||
2404                     !policydb_role_isvalid(p, tr->new_role))
2405                         goto bad;
2406                 ltr = tr;
2407         }
2408
2409         rc = next_entry(buf, fp, sizeof(u32));
2410         if (rc)
2411                 goto bad;
2412         nel = le32_to_cpu(buf[0]);
2413         lra = NULL;
2414         for (i = 0; i < nel; i++) {
2415                 rc = -ENOMEM;
2416                 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
2417                 if (!ra)
2418                         goto bad;
2419                 if (lra)
2420                         lra->next = ra;
2421                 else
2422                         p->role_allow = ra;
2423                 rc = next_entry(buf, fp, sizeof(u32)*2);
2424                 if (rc)
2425                         goto bad;
2426
2427                 rc = -EINVAL;
2428                 ra->role = le32_to_cpu(buf[0]);
2429                 ra->new_role = le32_to_cpu(buf[1]);
2430                 if (!policydb_role_isvalid(p, ra->role) ||
2431                     !policydb_role_isvalid(p, ra->new_role))
2432                         goto bad;
2433                 lra = ra;
2434         }
2435
2436         rc = filename_trans_read(p, fp);
2437         if (rc)
2438                 goto bad;
2439
2440         rc = policydb_index(p);
2441         if (rc)
2442                 goto bad;
2443
2444         rc = -EINVAL;
2445         p->process_trans_perms = string_to_av_perm(p, p->process_class, "transition");
2446         p->process_trans_perms |= string_to_av_perm(p, p->process_class, "dyntransition");
2447         if (!p->process_trans_perms)
2448                 goto bad;
2449
2450         rc = ocontext_read(p, info, fp);
2451         if (rc)
2452                 goto bad;
2453
2454         rc = genfs_read(p, fp);
2455         if (rc)
2456                 goto bad;
2457
2458         rc = range_read(p, fp);
2459         if (rc)
2460                 goto bad;
2461
2462         rc = -ENOMEM;
2463         p->type_attr_map_array = flex_array_alloc(sizeof(struct ebitmap),
2464                                                   p->p_types.nprim,
2465                                                   GFP_KERNEL | __GFP_ZERO);
2466         if (!p->type_attr_map_array)
2467                 goto bad;
2468
2469         /* preallocate so we don't have to worry about the put ever failing */
2470         rc = flex_array_prealloc(p->type_attr_map_array, 0, p->p_types.nprim,
2471                                  GFP_KERNEL | __GFP_ZERO);
2472         if (rc)
2473                 goto bad;
2474
2475         for (i = 0; i < p->p_types.nprim; i++) {
2476                 struct ebitmap *e = flex_array_get(p->type_attr_map_array, i);
2477
2478                 BUG_ON(!e);
2479                 ebitmap_init(e);
2480                 if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
2481                         rc = ebitmap_read(e, fp);
2482                         if (rc)
2483                                 goto bad;
2484                 }
2485                 /* add the type itself as the degenerate case */
2486                 rc = ebitmap_set_bit(e, i, 1);
2487                 if (rc)
2488                         goto bad;
2489         }
2490
2491         rc = policydb_bounds_sanity_check(p);
2492         if (rc)
2493                 goto bad;
2494
2495         rc = 0;
2496 out:
2497         return rc;
2498 bad:
2499         policydb_destroy(p);
2500         goto out;
2501 }
2502
2503 /*
2504  * Write a MLS level structure to a policydb binary
2505  * representation file.
2506  */
2507 static int mls_write_level(struct mls_level *l, void *fp)
2508 {
2509         __le32 buf[1];
2510         int rc;
2511
2512         buf[0] = cpu_to_le32(l->sens);
2513         rc = put_entry(buf, sizeof(u32), 1, fp);
2514         if (rc)
2515                 return rc;
2516
2517         rc = ebitmap_write(&l->cat, fp);
2518         if (rc)
2519                 return rc;
2520
2521         return 0;
2522 }
2523
2524 /*
2525  * Write a MLS range structure to a policydb binary
2526  * representation file.
2527  */
2528 static int mls_write_range_helper(struct mls_range *r, void *fp)
2529 {
2530         __le32 buf[3];
2531         size_t items;
2532         int rc, eq;
2533
2534         eq = mls_level_eq(&r->level[1], &r->level[0]);
2535
2536         if (eq)
2537                 items = 2;
2538         else
2539                 items = 3;
2540         buf[0] = cpu_to_le32(items-1);
2541         buf[1] = cpu_to_le32(r->level[0].sens);
2542         if (!eq)
2543                 buf[2] = cpu_to_le32(r->level[1].sens);
2544
2545         BUG_ON(items > (sizeof(buf)/sizeof(buf[0])));
2546
2547         rc = put_entry(buf, sizeof(u32), items, fp);
2548         if (rc)
2549                 return rc;
2550
2551         rc = ebitmap_write(&r->level[0].cat, fp);
2552         if (rc)
2553                 return rc;
2554         if (!eq) {
2555                 rc = ebitmap_write(&r->level[1].cat, fp);
2556                 if (rc)
2557                         return rc;
2558         }
2559
2560         return 0;
2561 }
2562
2563 static int sens_write(void *vkey, void *datum, void *ptr)
2564 {
2565         char *key = vkey;
2566         struct level_datum *levdatum = datum;
2567         struct policy_data *pd = ptr;
2568         void *fp = pd->fp;
2569         __le32 buf[2];
2570         size_t len;
2571         int rc;
2572
2573         len = strlen(key);
2574         buf[0] = cpu_to_le32(len);
2575         buf[1] = cpu_to_le32(levdatum->isalias);
2576         rc = put_entry(buf, sizeof(u32), 2, fp);
2577         if (rc)
2578                 return rc;
2579
2580         rc = put_entry(key, 1, len, fp);
2581         if (rc)
2582                 return rc;
2583
2584         rc = mls_write_level(levdatum->level, fp);
2585         if (rc)
2586                 return rc;
2587
2588         return 0;
2589 }
2590
2591 static int cat_write(void *vkey, void *datum, void *ptr)
2592 {
2593         char *key = vkey;
2594         struct cat_datum *catdatum = datum;
2595         struct policy_data *pd = ptr;
2596         void *fp = pd->fp;
2597         __le32 buf[3];
2598         size_t len;
2599         int rc;
2600
2601         len = strlen(key);
2602         buf[0] = cpu_to_le32(len);
2603         buf[1] = cpu_to_le32(catdatum->value);
2604         buf[2] = cpu_to_le32(catdatum->isalias);
2605         rc = put_entry(buf, sizeof(u32), 3, fp);
2606         if (rc)
2607                 return rc;
2608
2609         rc = put_entry(key, 1, len, fp);
2610         if (rc)
2611                 return rc;
2612
2613         return 0;
2614 }
2615
2616 static int role_trans_write(struct policydb *p, void *fp)
2617 {
2618         struct role_trans *r = p->role_tr;
2619         struct role_trans *tr;
2620         u32 buf[3];
2621         size_t nel;
2622         int rc;
2623
2624         nel = 0;
2625         for (tr = r; tr; tr = tr->next)
2626                 nel++;
2627         buf[0] = cpu_to_le32(nel);
2628         rc = put_entry(buf, sizeof(u32), 1, fp);
2629         if (rc)
2630                 return rc;
2631         for (tr = r; tr; tr = tr->next) {
2632                 buf[0] = cpu_to_le32(tr->role);
2633                 buf[1] = cpu_to_le32(tr->type);
2634                 buf[2] = cpu_to_le32(tr->new_role);
2635                 rc = put_entry(buf, sizeof(u32), 3, fp);
2636                 if (rc)
2637                         return rc;
2638                 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2639                         buf[0] = cpu_to_le32(tr->tclass);
2640                         rc = put_entry(buf, sizeof(u32), 1, fp);
2641                         if (rc)
2642                                 return rc;
2643                 }
2644         }
2645
2646         return 0;
2647 }
2648
2649 static int role_allow_write(struct role_allow *r, void *fp)
2650 {
2651         struct role_allow *ra;
2652         u32 buf[2];
2653         size_t nel;
2654         int rc;
2655
2656         nel = 0;
2657         for (ra = r; ra; ra = ra->next)
2658                 nel++;
2659         buf[0] = cpu_to_le32(nel);
2660         rc = put_entry(buf, sizeof(u32), 1, fp);
2661         if (rc)
2662                 return rc;
2663         for (ra = r; ra; ra = ra->next) {
2664                 buf[0] = cpu_to_le32(ra->role);
2665                 buf[1] = cpu_to_le32(ra->new_role);
2666                 rc = put_entry(buf, sizeof(u32), 2, fp);
2667                 if (rc)
2668                         return rc;
2669         }
2670         return 0;
2671 }
2672
2673 /*
2674  * Write a security context structure
2675  * to a policydb binary representation file.
2676  */
2677 static int context_write(struct policydb *p, struct context *c,
2678                          void *fp)
2679 {
2680         int rc;
2681         __le32 buf[3];
2682
2683         buf[0] = cpu_to_le32(c->user);
2684         buf[1] = cpu_to_le32(c->role);
2685         buf[2] = cpu_to_le32(c->type);
2686
2687         rc = put_entry(buf, sizeof(u32), 3, fp);
2688         if (rc)
2689                 return rc;
2690
2691         rc = mls_write_range_helper(&c->range, fp);
2692         if (rc)
2693                 return rc;
2694
2695         return 0;
2696 }
2697
2698 /*
2699  * The following *_write functions are used to
2700  * write the symbol data to a policy database
2701  * binary representation file.
2702  */
2703
2704 static int perm_write(void *vkey, void *datum, void *fp)
2705 {
2706         char *key = vkey;
2707         struct perm_datum *perdatum = datum;
2708         __le32 buf[2];
2709         size_t len;
2710         int rc;
2711
2712         len = strlen(key);
2713         buf[0] = cpu_to_le32(len);
2714         buf[1] = cpu_to_le32(perdatum->value);
2715         rc = put_entry(buf, sizeof(u32), 2, fp);
2716         if (rc)
2717                 return rc;
2718
2719         rc = put_entry(key, 1, len, fp);
2720         if (rc)
2721                 return rc;
2722
2723         return 0;
2724 }
2725
2726 static int common_write(void *vkey, void *datum, void *ptr)
2727 {
2728         char *key = vkey;
2729         struct common_datum *comdatum = datum;
2730         struct policy_data *pd = ptr;
2731         void *fp = pd->fp;
2732         __le32 buf[4];
2733         size_t len;
2734         int rc;
2735
2736         len = strlen(key);
2737         buf[0] = cpu_to_le32(len);
2738         buf[1] = cpu_to_le32(comdatum->value);
2739         buf[2] = cpu_to_le32(comdatum->permissions.nprim);
2740         buf[3] = cpu_to_le32(comdatum->permissions.table->nel);
2741         rc = put_entry(buf, sizeof(u32), 4, fp);
2742         if (rc)
2743                 return rc;
2744
2745         rc = put_entry(key, 1, len, fp);
2746         if (rc)
2747                 return rc;
2748
2749         rc = hashtab_map(comdatum->permissions.table, perm_write, fp);
2750         if (rc)
2751                 return rc;
2752
2753         return 0;
2754 }
2755
2756 static int write_cons_helper(struct policydb *p, struct constraint_node *node,
2757                              void *fp)
2758 {
2759         struct constraint_node *c;
2760         struct constraint_expr *e;
2761         __le32 buf[3];
2762         u32 nel;
2763         int rc;
2764
2765         for (c = node; c; c = c->next) {
2766                 nel = 0;
2767                 for (e = c->expr; e; e = e->next)
2768                         nel++;
2769                 buf[0] = cpu_to_le32(c->permissions);
2770                 buf[1] = cpu_to_le32(nel);
2771                 rc = put_entry(buf, sizeof(u32), 2, fp);
2772                 if (rc)
2773                         return rc;
2774                 for (e = c->expr; e; e = e->next) {
2775                         buf[0] = cpu_to_le32(e->expr_type);
2776                         buf[1] = cpu_to_le32(e->attr);
2777                         buf[2] = cpu_to_le32(e->op);
2778                         rc = put_entry(buf, sizeof(u32), 3, fp);
2779                         if (rc)
2780                                 return rc;
2781
2782                         switch (e->expr_type) {
2783                         case CEXPR_NAMES:
2784                                 rc = ebitmap_write(&e->names, fp);
2785                                 if (rc)
2786                                         return rc;
2787                                 break;
2788                         default:
2789                                 break;
2790                         }
2791                 }
2792         }
2793
2794         return 0;
2795 }
2796
2797 static int class_write(void *vkey, void *datum, void *ptr)
2798 {
2799         char *key = vkey;
2800         struct class_datum *cladatum = datum;
2801         struct policy_data *pd = ptr;
2802         void *fp = pd->fp;
2803         struct policydb *p = pd->p;
2804         struct constraint_node *c;
2805         __le32 buf[6];
2806         u32 ncons;
2807         size_t len, len2;
2808         int rc;
2809
2810         len = strlen(key);
2811         if (cladatum->comkey)
2812                 len2 = strlen(cladatum->comkey);
2813         else
2814                 len2 = 0;
2815
2816         ncons = 0;
2817         for (c = cladatum->constraints; c; c = c->next)
2818                 ncons++;
2819
2820         buf[0] = cpu_to_le32(len);
2821         buf[1] = cpu_to_le32(len2);
2822         buf[2] = cpu_to_le32(cladatum->value);
2823         buf[3] = cpu_to_le32(cladatum->permissions.nprim);
2824         if (cladatum->permissions.table)
2825                 buf[4] = cpu_to_le32(cladatum->permissions.table->nel);
2826         else
2827                 buf[4] = 0;
2828         buf[5] = cpu_to_le32(ncons);
2829         rc = put_entry(buf, sizeof(u32), 6, fp);
2830         if (rc)
2831                 return rc;
2832
2833         rc = put_entry(key, 1, len, fp);
2834         if (rc)
2835                 return rc;
2836
2837         if (cladatum->comkey) {
2838                 rc = put_entry(cladatum->comkey, 1, len2, fp);
2839                 if (rc)
2840                         return rc;
2841         }
2842
2843         rc = hashtab_map(cladatum->permissions.table, perm_write, fp);
2844         if (rc)
2845                 return rc;
2846
2847         rc = write_cons_helper(p, cladatum->constraints, fp);
2848         if (rc)
2849                 return rc;
2850
2851         /* write out the validatetrans rule */
2852         ncons = 0;
2853         for (c = cladatum->validatetrans; c; c = c->next)
2854                 ncons++;
2855
2856         buf[0] = cpu_to_le32(ncons);
2857         rc = put_entry(buf, sizeof(u32), 1, fp);
2858         if (rc)
2859                 return rc;
2860
2861         rc = write_cons_helper(p, cladatum->validatetrans, fp);
2862         if (rc)
2863                 return rc;
2864
2865         if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
2866                 buf[0] = cpu_to_le32(cladatum->default_user);
2867                 buf[1] = cpu_to_le32(cladatum->default_role);
2868                 buf[2] = cpu_to_le32(cladatum->default_range);
2869
2870                 rc = put_entry(buf, sizeof(uint32_t), 3, fp);
2871                 if (rc)
2872                         return rc;
2873         }
2874
2875         if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
2876                 buf[0] = cpu_to_le32(cladatum->default_type);
2877                 rc = put_entry(buf, sizeof(uint32_t), 1, fp);
2878                 if (rc)
2879                         return rc;
2880         }
2881
2882         return 0;
2883 }
2884
2885 static int role_write(void *vkey, void *datum, void *ptr)
2886 {
2887         char *key = vkey;
2888         struct role_datum *role = datum;
2889         struct policy_data *pd = ptr;
2890         void *fp = pd->fp;
2891         struct policydb *p = pd->p;
2892         __le32 buf[3];
2893         size_t items, len;
2894         int rc;
2895
2896         len = strlen(key);
2897         items = 0;
2898         buf[items++] = cpu_to_le32(len);
2899         buf[items++] = cpu_to_le32(role->value);
2900         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
2901                 buf[items++] = cpu_to_le32(role->bounds);
2902
2903         BUG_ON(items > (sizeof(buf)/sizeof(buf[0])));
2904
2905         rc = put_entry(buf, sizeof(u32), items, fp);
2906         if (rc)
2907                 return rc;
2908
2909         rc = put_entry(key, 1, len, fp);
2910         if (rc)
2911                 return rc;
2912
2913         rc = ebitmap_write(&role->dominates, fp);
2914         if (rc)
2915                 return rc;
2916
2917         rc = ebitmap_write(&role->types, fp);
2918         if (rc)
2919                 return rc;
2920
2921         return 0;
2922 }
2923
2924 static int type_write(void *vkey, void *datum, void *ptr)
2925 {
2926         char *key = vkey;
2927         struct type_datum *typdatum = datum;
2928         struct policy_data *pd = ptr;
2929         struct policydb *p = pd->p;
2930         void *fp = pd->fp;
2931         __le32 buf[4];
2932         int rc;
2933         size_t items, len;
2934
2935         len = strlen(key);
2936         items = 0;
2937         buf[items++] = cpu_to_le32(len);
2938         buf[items++] = cpu_to_le32(typdatum->value);
2939         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
2940                 u32 properties = 0;
2941
2942                 if (typdatum->primary)
2943                         properties |= TYPEDATUM_PROPERTY_PRIMARY;
2944
2945                 if (typdatum->attribute)
2946                         properties |= TYPEDATUM_PROPERTY_ATTRIBUTE;
2947
2948                 buf[items++] = cpu_to_le32(properties);
2949                 buf[items++] = cpu_to_le32(typdatum->bounds);
2950         } else {
2951                 buf[items++] = cpu_to_le32(typdatum->primary);
2952         }
2953         BUG_ON(items > (sizeof(buf) / sizeof(buf[0])));
2954         rc = put_entry(buf, sizeof(u32), items, fp);
2955         if (rc)
2956                 return rc;
2957
2958         rc = put_entry(key, 1, len, fp);
2959         if (rc)
2960                 return rc;
2961
2962         return 0;
2963 }
2964
2965 static int user_write(void *vkey, void *datum, void *ptr)
2966 {
2967         char *key = vkey;
2968         struct user_datum *usrdatum = datum;
2969         struct policy_data *pd = ptr;
2970         struct policydb *p = pd->p;
2971         void *fp = pd->fp;
2972         __le32 buf[3];
2973         size_t items, len;
2974         int rc;
2975
2976         len = strlen(key);
2977         items = 0;
2978         buf[items++] = cpu_to_le32(len);
2979         buf[items++] = cpu_to_le32(usrdatum->value);
2980         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
2981                 buf[items++] = cpu_to_le32(usrdatum->bounds);
2982         BUG_ON(items > (sizeof(buf) / sizeof(buf[0])));
2983         rc = put_entry(buf, sizeof(u32), items, fp);
2984         if (rc)
2985                 return rc;
2986
2987         rc = put_entry(key, 1, len, fp);
2988         if (rc)
2989                 return rc;
2990
2991         rc = ebitmap_write(&usrdatum->roles, fp);
2992         if (rc)
2993                 return rc;
2994
2995         rc = mls_write_range_helper(&usrdatum->range, fp);
2996         if (rc)
2997                 return rc;
2998
2999         rc = mls_write_level(&usrdatum->dfltlevel, fp);
3000         if (rc)
3001                 return rc;
3002
3003         return 0;
3004 }
3005
3006 static int (*write_f[SYM_NUM]) (void *key, void *datum,
3007                                 void *datap) =
3008 {
3009         common_write,
3010         class_write,
3011         role_write,
3012         type_write,
3013         user_write,
3014         cond_write_bool,
3015         sens_write,
3016         cat_write,
3017 };
3018
3019 static int ocontext_write(struct policydb *p, struct policydb_compat_info *info,
3020                           void *fp)
3021 {
3022         unsigned int i, j, rc;
3023         size_t nel, len;
3024         __le32 buf[3];
3025         u32 nodebuf[8];
3026         struct ocontext *c;
3027         for (i = 0; i < info->ocon_num; i++) {
3028                 nel = 0;
3029                 for (c = p->ocontexts[i]; c; c = c->next)
3030                         nel++;
3031                 buf[0] = cpu_to_le32(nel);
3032                 rc = put_entry(buf, sizeof(u32), 1, fp);
3033                 if (rc)
3034                         return rc;
3035                 for (c = p->ocontexts[i]; c; c = c->next) {
3036                         switch (i) {
3037                         case OCON_ISID:
3038                                 buf[0] = cpu_to_le32(c->sid[0]);
3039                                 rc = put_entry(buf, sizeof(u32), 1, fp);
3040                                 if (rc)
3041                                         return rc;
3042                                 rc = context_write(p, &c->context[0], fp);
3043                                 if (rc)
3044                                         return rc;
3045                                 break;
3046                         case OCON_FS:
3047                         case OCON_NETIF:
3048                                 len = strlen(c->u.name);
3049                                 buf[0] = cpu_to_le32(len);
3050                                 rc = put_entry(buf, sizeof(u32), 1, fp);
3051                                 if (rc)
3052                                         return rc;
3053                                 rc = put_entry(c->u.name, 1, len, fp);
3054                                 if (rc)
3055                                         return rc;
3056                                 rc = context_write(p, &c->context[0], fp);
3057                                 if (rc)
3058                                         return rc;
3059                                 rc = context_write(p, &c->context[1], fp);
3060                                 if (rc)
3061                                         return rc;
3062                                 break;
3063                         case OCON_PORT:
3064                                 buf[0] = cpu_to_le32(c->u.port.protocol);
3065                                 buf[1] = cpu_to_le32(c->u.port.low_port);
3066                                 buf[2] = cpu_to_le32(c->u.port.high_port);
3067                                 rc = put_entry(buf, sizeof(u32), 3, fp);
3068                                 if (rc)
3069                                         return rc;
3070                                 rc = context_write(p, &c->context[0], fp);
3071                                 if (rc)
3072                                         return rc;
3073                                 break;
3074                         case OCON_NODE:
3075                                 nodebuf[0] = c->u.node.addr; /* network order */
3076                                 nodebuf[1] = c->u.node.mask; /* network order */
3077                                 rc = put_entry(nodebuf, sizeof(u32), 2, fp);
3078                                 if (rc)
3079                                         return rc;
3080                                 rc = context_write(p, &c->context[0], fp);
3081                                 if (rc)
3082                                         return rc;
3083                                 break;
3084                         case OCON_FSUSE:
3085                                 buf[0] = cpu_to_le32(c->v.behavior);
3086                                 len = strlen(c->u.name);
3087                                 buf[1] = cpu_to_le32(len);
3088                                 rc = put_entry(buf, sizeof(u32), 2, fp);
3089                                 if (rc)
3090                                         return rc;
3091                                 rc = put_entry(c->u.name, 1, len, fp);
3092                                 if (rc)
3093                                         return rc;
3094                                 rc = context_write(p, &c->context[0], fp);
3095                                 if (rc)
3096                                         return rc;
3097                                 break;
3098                         case OCON_NODE6:
3099                                 for (j = 0; j < 4; j++)
3100                                         nodebuf[j] = c->u.node6.addr[j]; /* network order */
3101                                 for (j = 0; j < 4; j++)
3102                                         nodebuf[j + 4] = c->u.node6.mask[j]; /* network order */
3103                                 rc = put_entry(nodebuf, sizeof(u32), 8, fp);
3104                                 if (rc)
3105                                         return rc;
3106                                 rc = context_write(p, &c->context[0], fp);
3107                                 if (rc)
3108                                         return rc;
3109                                 break;
3110                         }
3111                 }
3112         }
3113         return 0;
3114 }
3115
3116 static int genfs_write(struct policydb *p, void *fp)
3117 {
3118         struct genfs *genfs;
3119         struct ocontext *c;
3120         size_t len;
3121         __le32 buf[1];
3122         int rc;
3123
3124         len = 0;
3125         for (genfs = p->genfs; genfs; genfs = genfs->next)
3126                 len++;
3127         buf[0] = cpu_to_le32(len);
3128         rc = put_entry(buf, sizeof(u32), 1, fp);
3129         if (rc)
3130                 return rc;
3131         for (genfs = p->genfs; genfs; genfs = genfs->next) {
3132                 len = strlen(genfs->fstype);
3133                 buf[0] = cpu_to_le32(len);
3134                 rc = put_entry(buf, sizeof(u32), 1, fp);
3135                 if (rc)
3136                         return rc;
3137                 rc = put_entry(genfs->fstype, 1, len, fp);
3138                 if (rc)
3139                         return rc;
3140                 len = 0;
3141                 for (c = genfs->head; c; c = c->next)
3142                         len++;
3143                 buf[0] = cpu_to_le32(len);
3144                 rc = put_entry(buf, sizeof(u32), 1, fp);
3145                 if (rc)
3146                         return rc;
3147                 for (c = genfs->head; c; c = c->next) {
3148                         len = strlen(c->u.name);
3149                         buf[0] = cpu_to_le32(len);
3150                         rc = put_entry(buf, sizeof(u32), 1, fp);
3151                         if (rc)
3152                                 return rc;
3153                         rc = put_entry(c->u.name, 1, len, fp);
3154                         if (rc)
3155                                 return rc;
3156                         buf[0] = cpu_to_le32(c->v.sclass);
3157                         rc = put_entry(buf, sizeof(u32), 1, fp);
3158                         if (rc)
3159                                 return rc;
3160                         rc = context_write(p, &c->context[0], fp);
3161                         if (rc)
3162                                 return rc;
3163                 }
3164         }
3165         return 0;
3166 }
3167
3168 static int hashtab_cnt(void *key, void *data, void *ptr)
3169 {
3170         int *cnt = ptr;
3171         *cnt = *cnt + 1;
3172
3173         return 0;
3174 }
3175
3176 static int range_write_helper(void *key, void *data, void *ptr)
3177 {
3178         __le32 buf[2];
3179         struct range_trans *rt = key;
3180         struct mls_range *r = data;
3181         struct policy_data *pd = ptr;
3182         void *fp = pd->fp;
3183         struct policydb *p = pd->p;
3184         int rc;
3185
3186         buf[0] = cpu_to_le32(rt->source_type);
3187         buf[1] = cpu_to_le32(rt->target_type);
3188         rc = put_entry(buf, sizeof(u32), 2, fp);
3189         if (rc)
3190                 return rc;
3191         if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
3192                 buf[0] = cpu_to_le32(rt->target_class);
3193                 rc = put_entry(buf, sizeof(u32), 1, fp);
3194                 if (rc)
3195                         return rc;
3196         }
3197         rc = mls_write_range_helper(r, fp);
3198         if (rc)
3199                 return rc;
3200
3201         return 0;
3202 }
3203
3204 static int range_write(struct policydb *p, void *fp)
3205 {
3206         __le32 buf[1];
3207         int rc, nel;
3208         struct policy_data pd;
3209
3210         pd.p = p;
3211         pd.fp = fp;
3212
3213         /* count the number of entries in the hashtab */
3214         nel = 0;
3215         rc = hashtab_map(p->range_tr, hashtab_cnt, &nel);
3216         if (rc)
3217                 return rc;
3218
3219         buf[0] = cpu_to_le32(nel);
3220         rc = put_entry(buf, sizeof(u32), 1, fp);
3221         if (rc)
3222                 return rc;
3223
3224         /* actually write all of the entries */
3225         rc = hashtab_map(p->range_tr, range_write_helper, &pd);
3226         if (rc)
3227                 return rc;
3228
3229         return 0;
3230 }
3231
3232 static int filename_write_helper(void *key, void *data, void *ptr)
3233 {
3234         __le32 buf[4];
3235         struct filename_trans *ft = key;
3236         struct filename_trans_datum *otype = data;
3237         void *fp = ptr;
3238         int rc;
3239         u32 len;
3240
3241         len = strlen(ft->name);
3242         buf[0] = cpu_to_le32(len);
3243         rc = put_entry(buf, sizeof(u32), 1, fp);
3244         if (rc)
3245                 return rc;
3246
3247         rc = put_entry(ft->name, sizeof(char), len, fp);
3248         if (rc)
3249                 return rc;
3250
3251         buf[0] = ft->stype;
3252         buf[1] = ft->ttype;
3253         buf[2] = ft->tclass;
3254         buf[3] = otype->otype;
3255
3256         rc = put_entry(buf, sizeof(u32), 4, fp);
3257         if (rc)
3258                 return rc;
3259
3260         return 0;
3261 }
3262
3263 static int filename_trans_write(struct policydb *p, void *fp)
3264 {
3265         u32 nel;
3266         __le32 buf[1];
3267         int rc;
3268
3269         if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
3270                 return 0;
3271
3272         nel = 0;
3273         rc = hashtab_map(p->filename_trans, hashtab_cnt, &nel);
3274         if (rc)
3275                 return rc;
3276
3277         buf[0] = cpu_to_le32(nel);
3278         rc = put_entry(buf, sizeof(u32), 1, fp);
3279         if (rc)
3280                 return rc;
3281
3282         rc = hashtab_map(p->filename_trans, filename_write_helper, fp);
3283         if (rc)
3284                 return rc;
3285
3286         return 0;
3287 }
3288
3289 /*
3290  * Write the configuration data in a policy database
3291  * structure to a policy database binary representation
3292  * file.
3293  */
3294 int policydb_write(struct policydb *p, void *fp)
3295 {
3296         unsigned int i, num_syms;
3297         int rc;
3298         __le32 buf[4];
3299         u32 config;
3300         size_t len;
3301         struct policydb_compat_info *info;
3302
3303         /*
3304          * refuse to write policy older than compressed avtab
3305          * to simplify the writer.  There are other tests dropped
3306          * since we assume this throughout the writer code.  Be
3307          * careful if you ever try to remove this restriction
3308          */
3309         if (p->policyvers < POLICYDB_VERSION_AVTAB) {
3310                 printk(KERN_ERR "SELinux: refusing to write policy version %d."
3311                        "  Because it is less than version %d\n", p->policyvers,
3312                        POLICYDB_VERSION_AVTAB);
3313                 return -EINVAL;
3314         }
3315
3316         config = 0;
3317         if (p->mls_enabled)
3318                 config |= POLICYDB_CONFIG_MLS;
3319
3320         if (p->reject_unknown)
3321                 config |= REJECT_UNKNOWN;
3322         if (p->allow_unknown)
3323                 config |= ALLOW_UNKNOWN;
3324
3325         /* Write the magic number and string identifiers. */
3326         buf[0] = cpu_to_le32(POLICYDB_MAGIC);
3327         len = strlen(POLICYDB_STRING);
3328         buf[1] = cpu_to_le32(len);
3329         rc = put_entry(buf, sizeof(u32), 2, fp);
3330         if (rc)
3331                 return rc;
3332         rc = put_entry(POLICYDB_STRING, 1, len, fp);
3333         if (rc)
3334                 return rc;
3335
3336         /* Write the version, config, and table sizes. */
3337         info = policydb_lookup_compat(p->policyvers);
3338         if (!info) {
3339                 printk(KERN_ERR "SELinux: compatibility lookup failed for policy "
3340                     "version %d", p->policyvers);
3341                 return -EINVAL;
3342         }
3343
3344         buf[0] = cpu_to_le32(p->policyvers);
3345         buf[1] = cpu_to_le32(config);
3346         buf[2] = cpu_to_le32(info->sym_num);
3347         buf[3] = cpu_to_le32(info->ocon_num);
3348
3349         rc = put_entry(buf, sizeof(u32), 4, fp);
3350         if (rc)
3351                 return rc;
3352
3353         if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
3354                 rc = ebitmap_write(&p->policycaps, fp);
3355                 if (rc)
3356                         return rc;
3357         }
3358
3359         if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
3360                 rc = ebitmap_write(&p->permissive_map, fp);
3361                 if (rc)
3362                         return rc;
3363         }
3364
3365         num_syms = info->sym_num;
3366         for (i = 0; i < num_syms; i++) {
3367                 struct policy_data pd;
3368
3369                 pd.fp = fp;
3370                 pd.p = p;
3371
3372                 buf[0] = cpu_to_le32(p->symtab[i].nprim);
3373                 buf[1] = cpu_to_le32(p->symtab[i].table->nel);
3374
3375                 rc = put_entry(buf, sizeof(u32), 2, fp);
3376                 if (rc)
3377                         return rc;
3378                 rc = hashtab_map(p->symtab[i].table, write_f[i], &pd);
3379                 if (rc)
3380                         return rc;
3381         }
3382
3383         rc = avtab_write(p, &p->te_avtab, fp);
3384         if (rc)
3385                 return rc;
3386
3387         rc = cond_write_list(p, p->cond_list, fp);
3388         if (rc)
3389                 return rc;
3390
3391         rc = role_trans_write(p, fp);
3392         if (rc)
3393                 return rc;
3394
3395         rc = role_allow_write(p->role_allow, fp);
3396         if (rc)
3397                 return rc;
3398
3399         rc = filename_trans_write(p, fp);
3400         if (rc)
3401                 return rc;
3402
3403         rc = ocontext_write(p, info, fp);
3404         if (rc)
3405                 return rc;
3406
3407         rc = genfs_write(p, fp);
3408         if (rc)
3409                 return rc;
3410
3411         rc = range_write(p, fp);
3412         if (rc)
3413                 return rc;
3414
3415         for (i = 0; i < p->p_types.nprim; i++) {
3416                 struct ebitmap *e = flex_array_get(p->type_attr_map_array, i);
3417
3418                 BUG_ON(!e);
3419                 rc = ebitmap_write(e, fp);
3420                 if (rc)
3421                         return rc;
3422         }
3423
3424         return 0;
3425 }