kernel/security/selinux/ss/policydb.c

   1 /*
   2  * Implementation of the policy database.
   3  *
   4  * Author : Stephen Smalley, <sds@epoch.ncsc.mil>
   5  */
   6
   7 /*
   8  * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
   9  *
  10  *      Support for enhanced MLS infrastructure.
  11  *
  12  * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
  13  *
  14  *      Added conditional policy language extensions
  15  *
  16  * Updated: Hewlett-Packard <paul@paul-moore.com>
  17  *
  18  *      Added support for the policy capability bitmap
  19  *
  20  * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
  21  * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
  22  * Copyright (C) 2003 - 2004 Tresys Technology, LLC
  23  *      This program is free software; you can redistribute it and/or modify
  24  *      it under the terms of the GNU General Public License as published by
  25  *      the Free Software Foundation, version 2.
  26  */
  27
  28 #include <linux/kernel.h>
  29 #include <linux/sched.h>
  30 #include <linux/slab.h>
  31 #include <linux/string.h>
  32 #include <linux/errno.h>
  33 #include <linux/audit.h>
  34 #include <linux/flex_array.h>
  35 #include "security.h"
  36
  37 #include "policydb.h"
  38 #include "conditional.h"
  39 #include "mls.h"
  40 #include "services.h"
  41
  42 #define _DEBUG_HASHES
  43
  44 #ifdef DEBUG_HASHES
  45 static const char *symtab_name[SYM_NUM] = {
  46         "common prefixes",
  47         "classes",
  48         "roles",
  49         "types",
  50         "users",
  51         "bools",
  52         "levels",
  53         "categories",
  54 };
  55 #endif
  56
  57 static unsigned int symtab_sizes[SYM_NUM] = {
  58         2,
  59         32,
  60         16,
  61         512,
  62         128,
  63         16,
  64         16,
  65         16,
  66 };
  67
  68 struct policydb_compat_info {
  69         int version;
  70         int sym_num;
  71         int ocon_num;
  72 };
  73
  74 /* These need to be updated if SYM_NUM or OCON_NUM changes */
  75 static struct policydb_compat_info policydb_compat[] = {
  76         {
  77                 .version        = POLICYDB_VERSION_BASE,
  78                 .sym_num        = SYM_NUM - 3,
  79                 .ocon_num       = OCON_NUM - 1,
  80         },
  81         {
  82                 .version        = POLICYDB_VERSION_BOOL,
  83                 .sym_num        = SYM_NUM - 2,
  84                 .ocon_num       = OCON_NUM - 1,
  85         },
  86         {
  87                 .version        = POLICYDB_VERSION_IPV6,
  88                 .sym_num        = SYM_NUM - 2,
  89                 .ocon_num       = OCON_NUM,
  90         },
  91         {
  92                 .version        = POLICYDB_VERSION_NLCLASS,
  93                 .sym_num        = SYM_NUM - 2,
  94                 .ocon_num       = OCON_NUM,
  95         },
  96         {
  97                 .version        = POLICYDB_VERSION_MLS,
  98                 .sym_num        = SYM_NUM,
  99                 .ocon_num       = OCON_NUM,
 100         },
 101         {
 102                 .version        = POLICYDB_VERSION_AVTAB,
 103                 .sym_num        = SYM_NUM,
 104                 .ocon_num       = OCON_NUM,
 105         },
 106         {
 107                 .version        = POLICYDB_VERSION_RANGETRANS,
 108                 .sym_num        = SYM_NUM,
 109                 .ocon_num       = OCON_NUM,
 110         },
 111         {
 112                 .version        = POLICYDB_VERSION_POLCAP,
 113                 .sym_num        = SYM_NUM,
 114                 .ocon_num       = OCON_NUM,
 115         },
 116         {
 117                 .version        = POLICYDB_VERSION_PERMISSIVE,
 118                 .sym_num        = SYM_NUM,
 119                 .ocon_num       = OCON_NUM,
 120         },
 121         {
 122                 .version        = POLICYDB_VERSION_BOUNDARY,
 123                 .sym_num        = SYM_NUM,
 124                 .ocon_num       = OCON_NUM,
 125         },
 126         {
 127                 .version        = POLICYDB_VERSION_FILENAME_TRANS,
 128                 .sym_num        = SYM_NUM,
 129                 .ocon_num       = OCON_NUM,
 130         },
 131         {
 132                 .version        = POLICYDB_VERSION_ROLETRANS,
 133                 .sym_num        = SYM_NUM,
 134                 .ocon_num       = OCON_NUM,
 135         },
 136         {
 137                 .version        = POLICYDB_VERSION_NEW_OBJECT_DEFAULTS,
 138                 .sym_num        = SYM_NUM,
 139                 .ocon_num       = OCON_NUM,
 140         },
 141         {
 142                 .version        = POLICYDB_VERSION_DEFAULT_TYPE,
 143                 .sym_num        = SYM_NUM,
 144                 .ocon_num       = OCON_NUM,
 145         },
 146         {
 147                 .version        = POLICYDB_VERSION_CONSTRAINT_NAMES,
 148                 .sym_num        = SYM_NUM,
 149                 .ocon_num       = OCON_NUM,
 150         },
 151 };
 152
 153 static struct policydb_compat_info *policydb_lookup_compat(int version)
 154 {
 155         int i;
 156         struct policydb_compat_info *info = NULL;
 157
 158         for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) {
 159                 if (policydb_compat[i].version == version) {
 160                         info = &policydb_compat[i];
 161                         break;
 162                 }
 163         }
 164         return info;
 165 }
 166
 167 /*
 168  * Initialize the role table.
 169  */
 170 static int roles_init(struct policydb *p)
 171 {
 172         char *key = NULL;
 173         int rc;
 174         struct role_datum *role;
 175
 176         rc = -ENOMEM;
 177         role = kzalloc(sizeof(*role), GFP_KERNEL);
 178         if (!role)
 179                 goto out;
 180
 181         rc = -EINVAL;
 182         role->value = ++p->p_roles.nprim;
 183         if (role->value != OBJECT_R_VAL)
 184                 goto out;
 185
 186         rc = -ENOMEM;
 187         key = kstrdup(OBJECT_R, GFP_KERNEL);
 188         if (!key)
 189                 goto out;
 190
 191         rc = hashtab_insert(p->p_roles.table, key, role);
 192         if (rc)
 193                 goto out;
 194
 195         return 0;
 196 out:
 197         kfree(key);
 198         kfree(role);
 199         return rc;
 200 }
 201
 202 static u32 filenametr_hash(struct hashtab *h, const void *k)
 203 {
 204         const struct filename_trans *ft = k;
 205         unsigned long hash;
 206         unsigned int byte_num;
 207         unsigned char focus;
 208
 209         hash = ft->stype ^ ft->ttype ^ ft->tclass;
 210
 211         byte_num = 0;
 212         while ((focus = ft->name[byte_num++]))
 213                 hash = partial_name_hash(focus, hash);
 214         return hash & (h->size - 1);
 215 }
 216
 217 static int filenametr_cmp(struct hashtab *h, const void *k1, const void *k2)
 218 {
 219         const struct filename_trans *ft1 = k1;
 220         const struct filename_trans *ft2 = k2;
 221         int v;
 222
 223         v = ft1->stype - ft2->stype;
 224         if (v)
 225                 return v;
 226
 227         v = ft1->ttype - ft2->ttype;
 228         if (v)
 229                 return v;
 230
 231         v = ft1->tclass - ft2->tclass;
 232         if (v)
 233                 return v;
 234
 235         return strcmp(ft1->name, ft2->name);
 236
 237 }
 238
 239 static u32 rangetr_hash(struct hashtab *h, const void *k)
 240 {
 241         const struct range_trans *key = k;
 242         return (key->source_type + (key->target_type << 3) +
 243                 (key->target_class << 5)) & (h->size - 1);
 244 }
 245
 246 static int rangetr_cmp(struct hashtab *h, const void *k1, const void *k2)
 247 {
 248         const struct range_trans *key1 = k1, *key2 = k2;
 249         int v;
 250
 251         v = key1->source_type - key2->source_type;
 252         if (v)
 253                 return v;
 254
 255         v = key1->target_type - key2->target_type;
 256         if (v)
 257                 return v;
 258
 259         v = key1->target_class - key2->target_class;
 260
 261         return v;
 262 }
 263
 264 /*
 265  * Initialize a policy database structure.
 266  */
 267 static int policydb_init(struct policydb *p)
 268 {
 269         int i, rc;
 270
 271         memset(p, 0, sizeof(*p));
 272
 273         for (i = 0; i < SYM_NUM; i++) {
 274                 rc = symtab_init(&p->symtab[i], symtab_sizes[i]);
 275                 if (rc)
 276                         goto out;
 277         }
 278
 279         rc = avtab_init(&p->te_avtab);
 280         if (rc)
 281                 goto out;
 282
 283         rc = roles_init(p);
 284         if (rc)
 285                 goto out;
 286
 287         rc = cond_policydb_init(p);
 288         if (rc)
 289                 goto out;
 290
 291         p->filename_trans = hashtab_create(filenametr_hash, filenametr_cmp, (1 << 10));
 292         if (!p->filename_trans) {
 293                 rc = -ENOMEM;
 294                 goto out;
 295         }
 296
 297         p->range_tr = hashtab_create(rangetr_hash, rangetr_cmp, 256);
 298         if (!p->range_tr) {
 299                 rc = -ENOMEM;
 300                 goto out;
 301         }
 302
 303         ebitmap_init(&p->filename_trans_ttypes);
 304         ebitmap_init(&p->policycaps);
 305         ebitmap_init(&p->permissive_map);
 306
 307         return 0;
 308 out:
 309         hashtab_destroy(p->filename_trans);
 310         hashtab_destroy(p->range_tr);
 311         for (i = 0; i < SYM_NUM; i++)
 312                 hashtab_destroy(p->symtab[i].table);
 313         return rc;
 314 }
 315
 316 /*
 317  * The following *_index functions are used to
 318  * define the val_to_name and val_to_struct arrays
 319  * in a policy database structure.  The val_to_name
 320  * arrays are used when converting security context
 321  * structures into string representations.  The
 322  * val_to_struct arrays are used when the attributes
 323  * of a class, role, or user are needed.
 324  */
 325
 326 static int common_index(void *key, void *datum, void *datap)
 327 {
 328         struct policydb *p;
 329         struct common_datum *comdatum;
 330         struct flex_array *fa;
 331
 332         comdatum = datum;
 333         p = datap;
 334         if (!comdatum->value || comdatum->value > p->p_commons.nprim)
 335                 return -EINVAL;
 336
 337         fa = p->sym_val_to_name[SYM_COMMONS];
 338         if (flex_array_put_ptr(fa, comdatum->value - 1, key,
 339                                GFP_KERNEL | __GFP_ZERO))
 340                 BUG();
 341         return 0;
 342 }
 343
 344 static int class_index(void *key, void *datum, void *datap)
 345 {
 346         struct policydb *p;
 347         struct class_datum *cladatum;
 348         struct flex_array *fa;
 349
 350         cladatum = datum;
 351         p = datap;
 352         if (!cladatum->value || cladatum->value > p->p_classes.nprim)
 353                 return -EINVAL;
 354         fa = p->sym_val_to_name[SYM_CLASSES];
 355         if (flex_array_put_ptr(fa, cladatum->value - 1, key,
 356                                GFP_KERNEL | __GFP_ZERO))
 357                 BUG();
 358         p->class_val_to_struct[cladatum->value - 1] = cladatum;
 359         return 0;
 360 }
 361
 362 static int role_index(void *key, void *datum, void *datap)
 363 {
 364         struct policydb *p;
 365         struct role_datum *role;
 366         struct flex_array *fa;
 367
 368         role = datum;
 369         p = datap;
 370         if (!role->value
 371             || role->value > p->p_roles.nprim
 372             || role->bounds > p->p_roles.nprim)
 373                 return -EINVAL;
 374
 375         fa = p->sym_val_to_name[SYM_ROLES];
 376         if (flex_array_put_ptr(fa, role->value - 1, key,
 377                                GFP_KERNEL | __GFP_ZERO))
 378                 BUG();
 379         p->role_val_to_struct[role->value - 1] = role;
 380         return 0;
 381 }
 382
 383 static int type_index(void *key, void *datum, void *datap)
 384 {
 385         struct policydb *p;
 386         struct type_datum *typdatum;
 387         struct flex_array *fa;
 388
 389         typdatum = datum;
 390         p = datap;
 391
 392         if (typdatum->primary) {
 393                 if (!typdatum->value
 394                     || typdatum->value > p->p_types.nprim
 395                     || typdatum->bounds > p->p_types.nprim)
 396                         return -EINVAL;
 397                 fa = p->sym_val_to_name[SYM_TYPES];
 398                 if (flex_array_put_ptr(fa, typdatum->value - 1, key,
 399                                        GFP_KERNEL | __GFP_ZERO))
 400                         BUG();
 401
 402                 fa = p->type_val_to_struct_array;
 403                 if (flex_array_put_ptr(fa, typdatum->value - 1, typdatum,
 404                                        GFP_KERNEL | __GFP_ZERO))
 405                         BUG();
 406         }
 407
 408         return 0;
 409 }
 410
 411 static int user_index(void *key, void *datum, void *datap)
 412 {
 413         struct policydb *p;
 414         struct user_datum *usrdatum;
 415         struct flex_array *fa;
 416
 417         usrdatum = datum;
 418         p = datap;
 419         if (!usrdatum->value
 420             || usrdatum->value > p->p_users.nprim
 421             || usrdatum->bounds > p->p_users.nprim)
 422                 return -EINVAL;
 423
 424         fa = p->sym_val_to_name[SYM_USERS];
 425         if (flex_array_put_ptr(fa, usrdatum->value - 1, key,
 426                                GFP_KERNEL | __GFP_ZERO))
 427                 BUG();
 428         p->user_val_to_struct[usrdatum->value - 1] = usrdatum;
 429         return 0;
 430 }
 431
 432 static int sens_index(void *key, void *datum, void *datap)
 433 {
 434         struct policydb *p;
 435         struct level_datum *levdatum;
 436         struct flex_array *fa;
 437
 438         levdatum = datum;
 439         p = datap;
 440
 441         if (!levdatum->isalias) {
 442                 if (!levdatum->level->sens ||
 443                     levdatum->level->sens > p->p_levels.nprim)
 444                         return -EINVAL;
 445                 fa = p->sym_val_to_name[SYM_LEVELS];
 446                 if (flex_array_put_ptr(fa, levdatum->level->sens - 1, key,
 447                                        GFP_KERNEL | __GFP_ZERO))
 448                         BUG();
 449         }
 450
 451         return 0;
 452 }
 453
 454 static int cat_index(void *key, void *datum, void *datap)
 455 {
 456         struct policydb *p;
 457         struct cat_datum *catdatum;
 458         struct flex_array *fa;
 459
 460         catdatum = datum;
 461         p = datap;
 462
 463         if (!catdatum->isalias) {
 464                 if (!catdatum->value || catdatum->value > p->p_cats.nprim)
 465                         return -EINVAL;
 466                 fa = p->sym_val_to_name[SYM_CATS];
 467                 if (flex_array_put_ptr(fa, catdatum->value - 1, key,
 468                                        GFP_KERNEL | __GFP_ZERO))
 469                         BUG();
 470         }
 471
 472         return 0;
 473 }
 474
 475 static int (*index_f[SYM_NUM]) (void *key, void *datum, void *datap) =
 476 {
 477         common_index,
 478         class_index,
 479         role_index,
 480         type_index,
 481         user_index,
 482         cond_index_bool,
 483         sens_index,
 484         cat_index,
 485 };
 486
 487 #ifdef DEBUG_HASHES
 488 static void hash_eval(struct hashtab *h, const char *hash_name)
 489 {
 490         struct hashtab_info info;
 491
 492         hashtab_stat(h, &info);
 493         printk(KERN_DEBUG "SELinux: %s:  %d entries and %d/%d buckets used, "
 494                "longest chain length %d\n", hash_name, h->nel,
 495                info.slots_used, h->size, info.max_chain_len);
 496 }
 497
 498 static void symtab_hash_eval(struct symtab *s)
 499 {
 500         int i;
 501
 502         for (i = 0; i < SYM_NUM; i++)
 503                 hash_eval(s[i].table, symtab_name[i]);
 504 }
 505
 506 #else
 507 static inline void hash_eval(struct hashtab *h, char *hash_name)
 508 {
 509 }
 510 #endif
 511
 512 /*
 513  * Define the other val_to_name and val_to_struct arrays
 514  * in a policy database structure.
 515  *
 516  * Caller must clean up on failure.
 517  */
 518 static int policydb_index(struct policydb *p)
 519 {
 520         int i, rc;
 521
 522         printk(KERN_DEBUG "SELinux:  %d users, %d roles, %d types, %d bools",
 523                p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim, p->p_bools.nprim);
 524         if (p->mls_enabled)
 525                 printk(", %d sens, %d cats", p->p_levels.nprim,
 526                        p->p_cats.nprim);
 527         printk("\n");
 528
 529         printk(KERN_DEBUG "SELinux:  %d classes, %d rules\n",
 530                p->p_classes.nprim, p->te_avtab.nel);
 531
 532 #ifdef DEBUG_HASHES
 533         avtab_hash_eval(&p->te_avtab, "rules");
 534         symtab_hash_eval(p->symtab);
 535 #endif
 536
 537         rc = -ENOMEM;
 538         p->class_val_to_struct =
 539                 kmalloc(p->p_classes.nprim * sizeof(*(p->class_val_to_struct)),
 540                         GFP_KERNEL);
 541         if (!p->class_val_to_struct)
 542                 goto out;
 543
 544         rc = -ENOMEM;
 545         p->role_val_to_struct =
 546                 kmalloc(p->p_roles.nprim * sizeof(*(p->role_val_to_struct)),
 547                         GFP_KERNEL);
 548         if (!p->role_val_to_struct)
 549                 goto out;
 550
 551         rc = -ENOMEM;
 552         p->user_val_to_struct =
 553                 kmalloc(p->p_users.nprim * sizeof(*(p->user_val_to_struct)),
 554                         GFP_KERNEL);
 555         if (!p->user_val_to_struct)
 556                 goto out;
 557
 558         /* Yes, I want the sizeof the pointer, not the structure */
 559         rc = -ENOMEM;
 560         p->type_val_to_struct_array = flex_array_alloc(sizeof(struct type_datum *),
 561                                                        p->p_types.nprim,
 562                                                        GFP_KERNEL | __GFP_ZERO);
 563         if (!p->type_val_to_struct_array)
 564                 goto out;
 565
 566         rc = flex_array_prealloc(p->type_val_to_struct_array, 0,
 567                                  p->p_types.nprim, GFP_KERNEL | __GFP_ZERO);
 568         if (rc)
 569                 goto out;
 570
 571         rc = cond_init_bool_indexes(p);
 572         if (rc)
 573                 goto out;
 574
 575         for (i = 0; i < SYM_NUM; i++) {
 576                 rc = -ENOMEM;
 577                 p->sym_val_to_name[i] = flex_array_alloc(sizeof(char *),
 578                                                          p->symtab[i].nprim,
 579                                                          GFP_KERNEL | __GFP_ZERO);
 580                 if (!p->sym_val_to_name[i])
 581                         goto out;
 582
 583                 rc = flex_array_prealloc(p->sym_val_to_name[i],
 584                                          0, p->symtab[i].nprim,
 585                                          GFP_KERNEL | __GFP_ZERO);
 586                 if (rc)
 587                         goto out;
 588
 589                 rc = hashtab_map(p->symtab[i].table, index_f[i], p);
 590                 if (rc)
 591                         goto out;
 592         }
 593         rc = 0;
 594 out:
 595         return rc;
 596 }
 597
 598 /*
 599  * The following *_destroy functions are used to
 600  * free any memory allocated for each kind of
 601  * symbol data in the policy database.
 602  */
 603
 604 static int perm_destroy(void *key, void *datum, void *p)
 605 {
 606         kfree(key);
 607         kfree(datum);
 608         return 0;
 609 }
 610
 611 static int common_destroy(void *key, void *datum, void *p)
 612 {
 613         struct common_datum *comdatum;
 614
 615         kfree(key);
 616         if (datum) {
 617                 comdatum = datum;
 618                 hashtab_map(comdatum->permissions.table, perm_destroy, NULL);
 619                 hashtab_destroy(comdatum->permissions.table);
 620         }
 621         kfree(datum);
 622         return 0;
 623 }
 624
 625 static void constraint_expr_destroy(struct constraint_expr *expr)
 626 {
 627         if (expr) {
 628                 ebitmap_destroy(&expr->names);
 629                 if (expr->type_names) {
 630                         ebitmap_destroy(&expr->type_names->types);
 631                         ebitmap_destroy(&expr->type_names->negset);
 632                         kfree(expr->type_names);
 633                 }
 634                 kfree(expr);
 635         }
 636 }
 637
 638 static int cls_destroy(void *key, void *datum, void *p)
 639 {
 640         struct class_datum *cladatum;
 641         struct constraint_node *constraint, *ctemp;
 642         struct constraint_expr *e, *etmp;
 643
 644         kfree(key);
 645         if (datum) {
 646                 cladatum = datum;
 647                 hashtab_map(cladatum->permissions.table, perm_destroy, NULL);
 648                 hashtab_destroy(cladatum->permissions.table);
 649                 constraint = cladatum->constraints;
 650                 while (constraint) {
 651                         e = constraint->expr;
 652                         while (e) {
 653                                 etmp = e;
 654                                 e = e->next;
 655                                 constraint_expr_destroy(etmp);
 656                         }
 657                         ctemp = constraint;
 658                         constraint = constraint->next;
 659                         kfree(ctemp);
 660                 }
 661
 662                 constraint = cladatum->validatetrans;
 663                 while (constraint) {
 664                         e = constraint->expr;
 665                         while (e) {
 666                                 etmp = e;
 667                                 e = e->next;
 668                                 constraint_expr_destroy(etmp);
 669                         }
 670                         ctemp = constraint;
 671                         constraint = constraint->next;
 672                         kfree(ctemp);
 673                 }
 674                 kfree(cladatum->comkey);
 675         }
 676         kfree(datum);
 677         return 0;
 678 }
 679
 680 static int role_destroy(void *key, void *datum, void *p)
 681 {
 682         struct role_datum *role;
 683
 684         kfree(key);
 685         if (datum) {
 686                 role = datum;
 687                 ebitmap_destroy(&role->dominates);
 688                 ebitmap_destroy(&role->types);
 689         }
 690         kfree(datum);
 691         return 0;
 692 }
 693
 694 static int type_destroy(void *key, void *datum, void *p)
 695 {
 696         kfree(key);
 697         kfree(datum);
 698         return 0;
 699 }
 700
 701 static int user_destroy(void *key, void *datum, void *p)
 702 {
 703         struct user_datum *usrdatum;
 704
 705         kfree(key);
 706         if (datum) {
 707                 usrdatum = datum;
 708                 ebitmap_destroy(&usrdatum->roles);
 709                 ebitmap_destroy(&usrdatum->range.level[0].cat);
 710                 ebitmap_destroy(&usrdatum->range.level[1].cat);
 711                 ebitmap_destroy(&usrdatum->dfltlevel.cat);
 712         }
 713         kfree(datum);
 714         return 0;
 715 }
 716
 717 static int sens_destroy(void *key, void *datum, void *p)
 718 {
 719         struct level_datum *levdatum;
 720
 721         kfree(key);
 722         if (datum) {
 723                 levdatum = datum;
 724                 ebitmap_destroy(&levdatum->level->cat);
 725                 kfree(levdatum->level);
 726         }
 727         kfree(datum);
 728         return 0;
 729 }
 730
 731 static int cat_destroy(void *key, void *datum, void *p)
 732 {
 733         kfree(key);
 734         kfree(datum);
 735         return 0;
 736 }
 737
 738 static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) =
 739 {
 740         common_destroy,
 741         cls_destroy,
 742         role_destroy,
 743         type_destroy,
 744         user_destroy,
 745         cond_destroy_bool,
 746         sens_destroy,
 747         cat_destroy,
 748 };
 749
 750 static int filenametr_destroy(void *key, void *datum, void *p)
 751 {
 752         struct filename_trans *ft = key;
 753         kfree(ft->name);
 754         kfree(key);
 755         kfree(datum);
 756         cond_resched();
 757         return 0;
 758 }
 759
 760 static int range_tr_destroy(void *key, void *datum, void *p)
 761 {
 762         struct mls_range *rt = datum;
 763         kfree(key);
 764         ebitmap_destroy(&rt->level[0].cat);
 765         ebitmap_destroy(&rt->level[1].cat);
 766         kfree(datum);
 767         cond_resched();
 768         return 0;
 769 }
 770
 771 static void ocontext_destroy(struct ocontext *c, int i)
 772 {
 773         if (!c)
 774                 return;
 775
 776         context_destroy(&c->context[0]);
 777         context_destroy(&c->context[1]);
 778         if (i == OCON_ISID || i == OCON_FS ||
 779             i == OCON_NETIF || i == OCON_FSUSE)
 780                 kfree(c->u.name);
 781         kfree(c);
 782 }
 783
 784 /*
 785  * Free any memory allocated by a policy database structure.
 786  */
 787 void policydb_destroy(struct policydb *p)
 788 {
 789         struct ocontext *c, *ctmp;
 790         struct genfs *g, *gtmp;
 791         int i;
 792         struct role_allow *ra, *lra = NULL;
 793         struct role_trans *tr, *ltr = NULL;
 794
 795         for (i = 0; i < SYM_NUM; i++) {
 796                 cond_resched();
 797                 hashtab_map(p->symtab[i].table, destroy_f[i], NULL);
 798                 hashtab_destroy(p->symtab[i].table);
 799         }
 800
 801         for (i = 0; i < SYM_NUM; i++) {
 802                 if (p->sym_val_to_name[i])
 803                         flex_array_free(p->sym_val_to_name[i]);
 804         }
 805
 806         kfree(p->class_val_to_struct);
 807         kfree(p->role_val_to_struct);
 808         kfree(p->user_val_to_struct);
 809         if (p->type_val_to_struct_array)
 810                 flex_array_free(p->type_val_to_struct_array);
 811
 812         avtab_destroy(&p->te_avtab);
 813
 814         for (i = 0; i < OCON_NUM; i++) {
 815                 cond_resched();
 816                 c = p->ocontexts[i];
 817                 while (c) {
 818                         ctmp = c;
 819                         c = c->next;
 820                         ocontext_destroy(ctmp, i);
 821                 }
 822                 p->ocontexts[i] = NULL;
 823         }
 824
 825         g = p->genfs;
 826         while (g) {
 827                 cond_resched();
 828                 kfree(g->fstype);
 829                 c = g->head;
 830                 while (c) {
 831                         ctmp = c;
 832                         c = c->next;
 833                         ocontext_destroy(ctmp, OCON_FSUSE);
 834                 }
 835                 gtmp = g;
 836                 g = g->next;
 837                 kfree(gtmp);
 838         }
 839         p->genfs = NULL;
 840
 841         cond_policydb_destroy(p);
 842
 843         for (tr = p->role_tr; tr; tr = tr->next) {
 844                 cond_resched();
 845                 kfree(ltr);
 846                 ltr = tr;
 847         }
 848         kfree(ltr);
 849
 850         for (ra = p->role_allow; ra; ra = ra->next) {
 851                 cond_resched();
 852                 kfree(lra);
 853                 lra = ra;
 854         }
 855         kfree(lra);
 856
 857         hashtab_map(p->filename_trans, filenametr_destroy, NULL);
 858         hashtab_destroy(p->filename_trans);
 859
 860         hashtab_map(p->range_tr, range_tr_destroy, NULL);
 861         hashtab_destroy(p->range_tr);
 862
 863         if (p->type_attr_map_array) {
 864                 for (i = 0; i < p->p_types.nprim; i++) {
 865                         struct ebitmap *e;
 866
 867                         e = flex_array_get(p->type_attr_map_array, i);
 868                         if (!e)
 869                                 continue;
 870                         ebitmap_destroy(e);
 871                 }
 872                 flex_array_free(p->type_attr_map_array);
 873         }
 874
 875         ebitmap_destroy(&p->filename_trans_ttypes);
 876         ebitmap_destroy(&p->policycaps);
 877         ebitmap_destroy(&p->permissive_map);
 878
 879         return;
 880 }
 881
 882 /*
 883  * Load the initial SIDs specified in a policy database
 884  * structure into a SID table.
 885  */
 886 int policydb_load_isids(struct policydb *p, struct sidtab *s)
 887 {
 888         struct ocontext *head, *c;
 889         int rc;
 890
 891         rc = sidtab_init(s);
 892         if (rc) {
 893                 printk(KERN_ERR "SELinux:  out of memory on SID table init\n");
 894                 goto out;
 895         }
 896
 897         head = p->ocontexts[OCON_ISID];
 898         for (c = head; c; c = c->next) {
 899                 rc = -EINVAL;
 900                 if (!c->context[0].user) {
 901                         printk(KERN_ERR "SELinux:  SID %s was never defined.\n",
 902                                 c->u.name);
 903                         goto out;
 904                 }
 905
 906                 rc = sidtab_insert(s, c->sid[0], &c->context[0]);
 907                 if (rc) {
 908                         printk(KERN_ERR "SELinux:  unable to load initial SID %s.\n",
 909                                 c->u.name);
 910                         goto out;
 911                 }
 912         }
 913         rc = 0;
 914 out:
 915         return rc;
 916 }
 917
 918 int policydb_class_isvalid(struct policydb *p, unsigned int class)
 919 {
 920         if (!class || class > p->p_classes.nprim)
 921                 return 0;
 922         return 1;
 923 }
 924
 925 int policydb_role_isvalid(struct policydb *p, unsigned int role)
 926 {
 927         if (!role || role > p->p_roles.nprim)
 928                 return 0;
 929         return 1;
 930 }
 931
 932 int policydb_type_isvalid(struct policydb *p, unsigned int type)
 933 {
 934         if (!type || type > p->p_types.nprim)
 935                 return 0;
 936         return 1;
 937 }
 938
 939 /*
 940  * Return 1 if the fields in the security context
 941  * structure `c' are valid.  Return 0 otherwise.
 942  */
 943 int policydb_context_isvalid(struct policydb *p, struct context *c)
 944 {
 945         struct role_datum *role;
 946         struct user_datum *usrdatum;
 947
 948         if (!c->role || c->role > p->p_roles.nprim)
 949                 return 0;
 950
 951         if (!c->user || c->user > p->p_users.nprim)
 952                 return 0;
 953
 954         if (!c->type || c->type > p->p_types.nprim)
 955                 return 0;
 956
 957         if (c->role != OBJECT_R_VAL) {
 958                 /*
 959                  * Role must be authorized for the type.
 960                  */
 961                 role = p->role_val_to_struct[c->role - 1];
 962                 if (!ebitmap_get_bit(&role->types, c->type - 1))
 963                         /* role may not be associated with type */
 964                         return 0;
 965
 966                 /*
 967                  * User must be authorized for the role.
 968                  */
 969                 usrdatum = p->user_val_to_struct[c->user - 1];
 970                 if (!usrdatum)
 971                         return 0;
 972
 973                 if (!ebitmap_get_bit(&usrdatum->roles, c->role - 1))
 974                         /* user may not be associated with role */
 975                         return 0;
 976         }
 977
 978         if (!mls_context_isvalid(p, c))
 979                 return 0;
 980
 981         return 1;
 982 }
 983
 984 /*
 985  * Read a MLS range structure from a policydb binary
 986  * representation file.
 987  */
 988 static int mls_read_range_helper(struct mls_range *r, void *fp)
 989 {
 990         __le32 buf[2];
 991         u32 items;
 992         int rc;
 993
 994         rc = next_entry(buf, fp, sizeof(u32));
 995         if (rc)
 996                 goto out;
 997
 998         rc = -EINVAL;
 999         items = le32_to_cpu(buf[0]);
1000         if (items > ARRAY_SIZE(buf)) {
1001                 printk(KERN_ERR "SELinux: mls:  range overflow\n");
1002                 goto out;
1003         }
1004
1005         rc = next_entry(buf, fp, sizeof(u32) * items);
1006         if (rc) {
1007                 printk(KERN_ERR "SELinux: mls:  truncated range\n");
1008                 goto out;
1009         }
1010
1011         r->level[0].sens = le32_to_cpu(buf[0]);
1012         if (items > 1)
1013                 r->level[1].sens = le32_to_cpu(buf[1]);
1014         else
1015                 r->level[1].sens = r->level[0].sens;
1016
1017         rc = ebitmap_read(&r->level[0].cat, fp);
1018         if (rc) {
1019                 printk(KERN_ERR "SELinux: mls:  error reading low categories\n");
1020                 goto out;
1021         }
1022         if (items > 1) {
1023                 rc = ebitmap_read(&r->level[1].cat, fp);
1024                 if (rc) {
1025                         printk(KERN_ERR "SELinux: mls:  error reading high categories\n");
1026                         goto bad_high;
1027                 }
1028         } else {
1029                 rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat);
1030                 if (rc) {
1031                         printk(KERN_ERR "SELinux: mls:  out of memory\n");
1032                         goto bad_high;
1033                 }
1034         }
1035
1036         return 0;
1037 bad_high:
1038         ebitmap_destroy(&r->level[0].cat);
1039 out:
1040         return rc;
1041 }
1042
1043 /*
1044  * Read and validate a security context structure
1045  * from a policydb binary representation file.
1046  */
1047 static int context_read_and_validate(struct context *c,
1048                                      struct policydb *p,
1049                                      void *fp)
1050 {
1051         __le32 buf[3];
1052         int rc;
1053
1054         rc = next_entry(buf, fp, sizeof buf);
1055         if (rc) {
1056                 printk(KERN_ERR "SELinux: context truncated\n");
1057                 goto out;
1058         }
1059         c->user = le32_to_cpu(buf[0]);
1060         c->role = le32_to_cpu(buf[1]);
1061         c->type = le32_to_cpu(buf[2]);
1062         if (p->policyvers >= POLICYDB_VERSION_MLS) {
1063                 rc = mls_read_range_helper(&c->range, fp);
1064                 if (rc) {
1065                         printk(KERN_ERR "SELinux: error reading MLS range of context\n");
1066                         goto out;
1067                 }
1068         }
1069
1070         rc = -EINVAL;
1071         if (!policydb_context_isvalid(p, c)) {
1072                 printk(KERN_ERR "SELinux:  invalid security context\n");
1073                 context_destroy(c);
1074                 goto out;
1075         }
1076         rc = 0;
1077 out:
1078         return rc;
1079 }
1080
1081 /*
1082  * The following *_read functions are used to
1083  * read the symbol data from a policy database
1084  * binary representation file.
1085  */
1086
1087 static int str_read(char **strp, gfp_t flags, void *fp, u32 len)
1088 {
1089         int rc;
1090         char *str;
1091
1092         str = kmalloc(len + 1, flags);
1093         if (!str)
1094                 return -ENOMEM;
1095
1096         /* it's expected the caller should free the str */
1097         *strp = str;
1098
1099         rc = next_entry(str, fp, len);
1100         if (rc)
1101                 return rc;
1102
1103         str[len] = '\0';
1104         return 0;
1105 }
1106
1107 static int perm_read(struct policydb *p, struct hashtab *h, void *fp)
1108 {
1109         char *key = NULL;
1110         struct perm_datum *perdatum;
1111         int rc;
1112         __le32 buf[2];
1113         u32 len;
1114
1115         rc = -ENOMEM;
1116         perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
1117         if (!perdatum)
1118                 goto bad;
1119
1120         rc = next_entry(buf, fp, sizeof buf);
1121         if (rc)
1122                 goto bad;
1123
1124         len = le32_to_cpu(buf[0]);
1125         perdatum->value = le32_to_cpu(buf[1]);
1126
1127         rc = str_read(&key, GFP_KERNEL, fp, len);
1128         if (rc)
1129                 goto bad;
1130
1131         rc = hashtab_insert(h, key, perdatum);
1132         if (rc)
1133                 goto bad;
1134
1135         return 0;
1136 bad:
1137         perm_destroy(key, perdatum, NULL);
1138         return rc;
1139 }
1140
1141 static int common_read(struct policydb *p, struct hashtab *h, void *fp)
1142 {
1143         char *key = NULL;
1144         struct common_datum *comdatum;
1145         __le32 buf[4];
1146         u32 len, nel;
1147         int i, rc;
1148
1149         rc = -ENOMEM;
1150         comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
1151         if (!comdatum)
1152                 goto bad;
1153
1154         rc = next_entry(buf, fp, sizeof buf);
1155         if (rc)
1156                 goto bad;
1157
1158         len = le32_to_cpu(buf[0]);
1159         comdatum->value = le32_to_cpu(buf[1]);
1160
1161         rc = symtab_init(&comdatum->permissions, PERM_SYMTAB_SIZE);
1162         if (rc)
1163                 goto bad;
1164         comdatum->permissions.nprim = le32_to_cpu(buf[2]);
1165         nel = le32_to_cpu(buf[3]);
1166
1167         rc = str_read(&key, GFP_KERNEL, fp, len);
1168         if (rc)
1169                 goto bad;
1170
1171         for (i = 0; i < nel; i++) {
1172                 rc = perm_read(p, comdatum->permissions.table, fp);
1173                 if (rc)
1174                         goto bad;
1175         }
1176
1177         rc = hashtab_insert(h, key, comdatum);
1178         if (rc)
1179                 goto bad;
1180         return 0;
1181 bad:
1182         common_destroy(key, comdatum, NULL);
1183         return rc;
1184 }
1185
1186 static void type_set_init(struct type_set *t)
1187 {
1188         ebitmap_init(&t->types);
1189         ebitmap_init(&t->negset);
1190 }
1191
1192 static int type_set_read(struct type_set *t, void *fp)
1193 {
1194         __le32 buf[1];
1195         int rc;
1196
1197         if (ebitmap_read(&t->types, fp))
1198                 return -EINVAL;
1199         if (ebitmap_read(&t->negset, fp))
1200                 return -EINVAL;
1201
1202         rc = next_entry(buf, fp, sizeof(u32));
1203         if (rc < 0)
1204                 return -EINVAL;
1205         t->flags = le32_to_cpu(buf[0]);
1206
1207         return 0;
1208 }
1209
1210
1211 static int read_cons_helper(struct policydb *p,
1212                                 struct constraint_node **nodep,
1213                                 int ncons, int allowxtarget, void *fp)
1214 {
1215         struct constraint_node *c, *lc;
1216         struct constraint_expr *e, *le;
1217         __le32 buf[3];
1218         u32 nexpr;
1219         int rc, i, j, depth;
1220
1221         lc = NULL;
1222         for (i = 0; i < ncons; i++) {
1223                 c = kzalloc(sizeof(*c), GFP_KERNEL);
1224                 if (!c)
1225                         return -ENOMEM;
1226
1227                 if (lc)
1228                         lc->next = c;
1229                 else
1230                         *nodep = c;
1231
1232                 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1233                 if (rc)
1234                         return rc;
1235                 c->permissions = le32_to_cpu(buf[0]);
1236                 nexpr = le32_to_cpu(buf[1]);
1237                 le = NULL;
1238                 depth = -1;
1239                 for (j = 0; j < nexpr; j++) {
1240                         e = kzalloc(sizeof(*e), GFP_KERNEL);
1241                         if (!e)
1242                                 return -ENOMEM;
1243
1244                         if (le)
1245                                 le->next = e;
1246                         else
1247                                 c->expr = e;
1248
1249                         rc = next_entry(buf, fp, (sizeof(u32) * 3));
1250                         if (rc)
1251                                 return rc;
1252                         e->expr_type = le32_to_cpu(buf[0]);
1253                         e->attr = le32_to_cpu(buf[1]);
1254                         e->op = le32_to_cpu(buf[2]);
1255
1256                         switch (e->expr_type) {
1257                         case CEXPR_NOT:
1258                                 if (depth < 0)
1259                                         return -EINVAL;
1260                                 break;
1261                         case CEXPR_AND:
1262                         case CEXPR_OR:
1263                                 if (depth < 1)
1264                                         return -EINVAL;
1265                                 depth--;
1266                                 break;
1267                         case CEXPR_ATTR:
1268                                 if (depth == (CEXPR_MAXDEPTH - 1))
1269                                         return -EINVAL;
1270                                 depth++;
1271                                 break;
1272                         case CEXPR_NAMES:
1273                                 if (!allowxtarget && (e->attr & CEXPR_XTARGET))
1274                                         return -EINVAL;
1275                                 if (depth == (CEXPR_MAXDEPTH - 1))
1276                                         return -EINVAL;
1277                                 depth++;
1278                                 rc = ebitmap_read(&e->names, fp);
1279                                 if (rc)
1280                                         return rc;
1281                                 if (p->policyvers >=
1282                                         POLICYDB_VERSION_CONSTRAINT_NAMES) {
1283                                                 e->type_names = kzalloc(sizeof
1284                                                 (*e->type_names),
1285                                                 GFP_KERNEL);
1286                                         if (!e->type_names)
1287                                                 return -ENOMEM;
1288                                         type_set_init(e->type_names);
1289                                         rc = type_set_read(e->type_names, fp);
1290                                         if (rc)
1291                                                 return rc;
1292                                 }
1293                                 break;
1294                         default:
1295                                 return -EINVAL;
1296                         }
1297                         le = e;
1298                 }
1299                 if (depth != 0)
1300                         return -EINVAL;
1301                 lc = c;
1302         }
1303
1304         return 0;
1305 }
1306
1307 static int class_read(struct policydb *p, struct hashtab *h, void *fp)
1308 {
1309         char *key = NULL;
1310         struct class_datum *cladatum;
1311         __le32 buf[6];
1312         u32 len, len2, ncons, nel;
1313         int i, rc;
1314
1315         rc = -ENOMEM;
1316         cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
1317         if (!cladatum)
1318                 goto bad;
1319
1320         rc = next_entry(buf, fp, sizeof(u32)*6);
1321         if (rc)
1322                 goto bad;
1323
1324         len = le32_to_cpu(buf[0]);
1325         len2 = le32_to_cpu(buf[1]);
1326         cladatum->value = le32_to_cpu(buf[2]);
1327
1328         rc = symtab_init(&cladatum->permissions, PERM_SYMTAB_SIZE);
1329         if (rc)
1330                 goto bad;
1331         cladatum->permissions.nprim = le32_to_cpu(buf[3]);
1332         nel = le32_to_cpu(buf[4]);
1333
1334         ncons = le32_to_cpu(buf[5]);
1335
1336         rc = str_read(&key, GFP_KERNEL, fp, len);
1337         if (rc)
1338                 goto bad;
1339
1340         if (len2) {
1341                 rc = str_read(&cladatum->comkey, GFP_KERNEL, fp, len2);
1342                 if (rc)
1343                         goto bad;
1344
1345                 rc = -EINVAL;
1346                 cladatum->comdatum = hashtab_search(p->p_commons.table, cladatum->comkey);
1347                 if (!cladatum->comdatum) {
1348                         printk(KERN_ERR "SELinux:  unknown common %s\n", cladatum->comkey);
1349                         goto bad;
1350                 }
1351         }
1352         for (i = 0; i < nel; i++) {
1353                 rc = perm_read(p, cladatum->permissions.table, fp);
1354                 if (rc)
1355                         goto bad;
1356         }
1357
1358         rc = read_cons_helper(p, &cladatum->constraints, ncons, 0, fp);
1359         if (rc)
1360                 goto bad;
1361
1362         if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
1363                 /* grab the validatetrans rules */
1364                 rc = next_entry(buf, fp, sizeof(u32));
1365                 if (rc)
1366                         goto bad;
1367                 ncons = le32_to_cpu(buf[0]);
1368                 rc = read_cons_helper(p, &cladatum->validatetrans,
1369                                 ncons, 1, fp);
1370                 if (rc)
1371                         goto bad;
1372         }
1373
1374         if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
1375                 rc = next_entry(buf, fp, sizeof(u32) * 3);
1376                 if (rc)
1377                         goto bad;
1378
1379                 cladatum->default_user = le32_to_cpu(buf[0]);
1380                 cladatum->default_role = le32_to_cpu(buf[1]);
1381                 cladatum->default_range = le32_to_cpu(buf[2]);
1382         }
1383
1384         if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
1385                 rc = next_entry(buf, fp, sizeof(u32) * 1);
1386                 if (rc)
1387                         goto bad;
1388                 cladatum->default_type = le32_to_cpu(buf[0]);
1389         }
1390
1391         rc = hashtab_insert(h, key, cladatum);
1392         if (rc)
1393                 goto bad;
1394
1395         return 0;
1396 bad:
1397         cls_destroy(key, cladatum, NULL);
1398         return rc;
1399 }
1400
1401 static int role_read(struct policydb *p, struct hashtab *h, void *fp)
1402 {
1403         char *key = NULL;
1404         struct role_datum *role;
1405         int rc, to_read = 2;
1406         __le32 buf[3];
1407         u32 len;
1408
1409         rc = -ENOMEM;
1410         role = kzalloc(sizeof(*role), GFP_KERNEL);
1411         if (!role)
1412                 goto bad;
1413
1414         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1415                 to_read = 3;
1416
1417         rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1418         if (rc)
1419                 goto bad;
1420
1421         len = le32_to_cpu(buf[0]);
1422         role->value = le32_to_cpu(buf[1]);
1423         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1424                 role->bounds = le32_to_cpu(buf[2]);
1425
1426         rc = str_read(&key, GFP_KERNEL, fp, len);
1427         if (rc)
1428                 goto bad;
1429
1430         rc = ebitmap_read(&role->dominates, fp);
1431         if (rc)
1432                 goto bad;
1433
1434         rc = ebitmap_read(&role->types, fp);
1435         if (rc)
1436                 goto bad;
1437
1438         if (strcmp(key, OBJECT_R) == 0) {
1439                 rc = -EINVAL;
1440                 if (role->value != OBJECT_R_VAL) {
1441                         printk(KERN_ERR "SELinux: Role %s has wrong value %d\n",
1442                                OBJECT_R, role->value);
1443                         goto bad;
1444                 }
1445                 rc = 0;
1446                 goto bad;
1447         }
1448
1449         rc = hashtab_insert(h, key, role);
1450         if (rc)
1451                 goto bad;
1452         return 0;
1453 bad:
1454         role_destroy(key, role, NULL);
1455         return rc;
1456 }
1457
1458 static int type_read(struct policydb *p, struct hashtab *h, void *fp)
1459 {
1460         char *key = NULL;
1461         struct type_datum *typdatum;
1462         int rc, to_read = 3;
1463         __le32 buf[4];
1464         u32 len;
1465
1466         rc = -ENOMEM;
1467         typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL);
1468         if (!typdatum)
1469                 goto bad;
1470
1471         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1472                 to_read = 4;
1473
1474         rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1475         if (rc)
1476                 goto bad;
1477
1478         len = le32_to_cpu(buf[0]);
1479         typdatum->value = le32_to_cpu(buf[1]);
1480         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
1481                 u32 prop = le32_to_cpu(buf[2]);
1482
1483                 if (prop & TYPEDATUM_PROPERTY_PRIMARY)
1484                         typdatum->primary = 1;
1485                 if (prop & TYPEDATUM_PROPERTY_ATTRIBUTE)
1486                         typdatum->attribute = 1;
1487
1488                 typdatum->bounds = le32_to_cpu(buf[3]);
1489         } else {
1490                 typdatum->primary = le32_to_cpu(buf[2]);
1491         }
1492
1493         rc = str_read(&key, GFP_KERNEL, fp, len);
1494         if (rc)
1495                 goto bad;
1496
1497         rc = hashtab_insert(h, key, typdatum);
1498         if (rc)
1499                 goto bad;
1500         return 0;
1501 bad:
1502         type_destroy(key, typdatum, NULL);
1503         return rc;
1504 }
1505
1506
1507 /*
1508  * Read a MLS level structure from a policydb binary
1509  * representation file.
1510  */
1511 static int mls_read_level(struct mls_level *lp, void *fp)
1512 {
1513         __le32 buf[1];
1514         int rc;
1515
1516         memset(lp, 0, sizeof(*lp));
1517
1518         rc = next_entry(buf, fp, sizeof buf);
1519         if (rc) {
1520                 printk(KERN_ERR "SELinux: mls: truncated level\n");
1521                 return rc;
1522         }
1523         lp->sens = le32_to_cpu(buf[0]);
1524
1525         rc = ebitmap_read(&lp->cat, fp);
1526         if (rc) {
1527                 printk(KERN_ERR "SELinux: mls:  error reading level categories\n");
1528                 return rc;
1529         }
1530         return 0;
1531 }
1532
1533 static int user_read(struct policydb *p, struct hashtab *h, void *fp)
1534 {
1535         char *key = NULL;
1536         struct user_datum *usrdatum;
1537         int rc, to_read = 2;
1538         __le32 buf[3];
1539         u32 len;
1540
1541         rc = -ENOMEM;
1542         usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
1543         if (!usrdatum)
1544                 goto bad;
1545
1546         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1547                 to_read = 3;
1548
1549         rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1550         if (rc)
1551                 goto bad;
1552
1553         len = le32_to_cpu(buf[0]);
1554         usrdatum->value = le32_to_cpu(buf[1]);
1555         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1556                 usrdatum->bounds = le32_to_cpu(buf[2]);
1557
1558         rc = str_read(&key, GFP_KERNEL, fp, len);
1559         if (rc)
1560                 goto bad;
1561
1562         rc = ebitmap_read(&usrdatum->roles, fp);
1563         if (rc)
1564                 goto bad;
1565
1566         if (p->policyvers >= POLICYDB_VERSION_MLS) {
1567                 rc = mls_read_range_helper(&usrdatum->range, fp);
1568                 if (rc)
1569                         goto bad;
1570                 rc = mls_read_level(&usrdatum->dfltlevel, fp);
1571                 if (rc)
1572                         goto bad;
1573         }
1574
1575         rc = hashtab_insert(h, key, usrdatum);
1576         if (rc)
1577                 goto bad;
1578         return 0;
1579 bad:
1580         user_destroy(key, usrdatum, NULL);
1581         return rc;
1582 }
1583
1584 static int sens_read(struct policydb *p, struct hashtab *h, void *fp)
1585 {
1586         char *key = NULL;
1587         struct level_datum *levdatum;
1588         int rc;
1589         __le32 buf[2];
1590         u32 len;
1591
1592         rc = -ENOMEM;
1593         levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC);
1594         if (!levdatum)
1595                 goto bad;
1596
1597         rc = next_entry(buf, fp, sizeof buf);
1598         if (rc)
1599                 goto bad;
1600
1601         len = le32_to_cpu(buf[0]);
1602         levdatum->isalias = le32_to_cpu(buf[1]);
1603
1604         rc = str_read(&key, GFP_ATOMIC, fp, len);
1605         if (rc)
1606                 goto bad;
1607
1608         rc = -ENOMEM;
1609         levdatum->level = kmalloc(sizeof(struct mls_level), GFP_ATOMIC);
1610         if (!levdatum->level)
1611                 goto bad;
1612
1613         rc = mls_read_level(levdatum->level, fp);
1614         if (rc)
1615                 goto bad;
1616
1617         rc = hashtab_insert(h, key, levdatum);
1618         if (rc)
1619                 goto bad;
1620         return 0;
1621 bad:
1622         sens_destroy(key, levdatum, NULL);
1623         return rc;
1624 }
1625
1626 static int cat_read(struct policydb *p, struct hashtab *h, void *fp)
1627 {
1628         char *key = NULL;
1629         struct cat_datum *catdatum;
1630         int rc;
1631         __le32 buf[3];
1632         u32 len;
1633
1634         rc = -ENOMEM;
1635         catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC);
1636         if (!catdatum)
1637                 goto bad;
1638
1639         rc = next_entry(buf, fp, sizeof buf);
1640         if (rc)
1641                 goto bad;
1642
1643         len = le32_to_cpu(buf[0]);
1644         catdatum->value = le32_to_cpu(buf[1]);
1645         catdatum->isalias = le32_to_cpu(buf[2]);
1646
1647         rc = str_read(&key, GFP_ATOMIC, fp, len);
1648         if (rc)
1649                 goto bad;
1650
1651         rc = hashtab_insert(h, key, catdatum);
1652         if (rc)
1653                 goto bad;
1654         return 0;
1655 bad:
1656         cat_destroy(key, catdatum, NULL);
1657         return rc;
1658 }
1659
1660 static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, void *fp) =
1661 {
1662         common_read,
1663         class_read,
1664         role_read,
1665         type_read,
1666         user_read,
1667         cond_read_bool,
1668         sens_read,
1669         cat_read,
1670 };
1671
1672 static int user_bounds_sanity_check(void *key, void *datum, void *datap)
1673 {
1674         struct user_datum *upper, *user;
1675         struct policydb *p = datap;
1676         int depth = 0;
1677
1678         upper = user = datum;
1679         while (upper->bounds) {
1680                 struct ebitmap_node *node;
1681                 unsigned long bit;
1682
1683                 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1684                         printk(KERN_ERR "SELinux: user %s: "
1685                                "too deep or looped boundary",
1686                                (char *) key);
1687                         return -EINVAL;
1688                 }
1689
1690                 upper = p->user_val_to_struct[upper->bounds - 1];
1691                 ebitmap_for_each_positive_bit(&user->roles, node, bit) {
1692                         if (ebitmap_get_bit(&upper->roles, bit))
1693                                 continue;
1694
1695                         printk(KERN_ERR
1696                                "SELinux: boundary violated policy: "
1697                                "user=%s role=%s bounds=%s\n",
1698                                sym_name(p, SYM_USERS, user->value - 1),
1699                                sym_name(p, SYM_ROLES, bit),
1700                                sym_name(p, SYM_USERS, upper->value - 1));
1701
1702                         return -EINVAL;
1703                 }
1704         }
1705
1706         return 0;
1707 }
1708
1709 static int role_bounds_sanity_check(void *key, void *datum, void *datap)
1710 {
1711         struct role_datum *upper, *role;
1712         struct policydb *p = datap;
1713         int depth = 0;
1714
1715         upper = role = datum;
1716         while (upper->bounds) {
1717                 struct ebitmap_node *node;
1718                 unsigned long bit;
1719
1720                 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1721                         printk(KERN_ERR "SELinux: role %s: "
1722                                "too deep or looped bounds\n",
1723                                (char *) key);
1724                         return -EINVAL;
1725                 }
1726
1727                 upper = p->role_val_to_struct[upper->bounds - 1];
1728                 ebitmap_for_each_positive_bit(&role->types, node, bit) {
1729                         if (ebitmap_get_bit(&upper->types, bit))
1730                                 continue;
1731
1732                         printk(KERN_ERR
1733                                "SELinux: boundary violated policy: "
1734                                "role=%s type=%s bounds=%s\n",
1735                                sym_name(p, SYM_ROLES, role->value - 1),
1736                                sym_name(p, SYM_TYPES, bit),
1737                                sym_name(p, SYM_ROLES, upper->value - 1));
1738
1739                         return -EINVAL;
1740                 }
1741         }
1742
1743         return 0;
1744 }
1745
1746 static int type_bounds_sanity_check(void *key, void *datum, void *datap)
1747 {
1748         struct type_datum *upper;
1749         struct policydb *p = datap;
1750         int depth = 0;
1751
1752         upper = datum;
1753         while (upper->bounds) {
1754                 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1755                         printk(KERN_ERR "SELinux: type %s: "
1756                                "too deep or looped boundary\n",
1757                                (char *) key);
1758                         return -EINVAL;
1759                 }
1760
1761                 upper = flex_array_get_ptr(p->type_val_to_struct_array,
1762                                            upper->bounds - 1);
1763                 BUG_ON(!upper);
1764
1765                 if (upper->attribute) {
1766                         printk(KERN_ERR "SELinux: type %s: "
1767                                "bounded by attribute %s",
1768                                (char *) key,
1769                                sym_name(p, SYM_TYPES, upper->value - 1));
1770                         return -EINVAL;
1771                 }
1772         }
1773
1774         return 0;
1775 }
1776
1777 static int policydb_bounds_sanity_check(struct policydb *p)
1778 {
1779         int rc;
1780
1781         if (p->policyvers < POLICYDB_VERSION_BOUNDARY)
1782                 return 0;
1783
1784         rc = hashtab_map(p->p_users.table,
1785                          user_bounds_sanity_check, p);
1786         if (rc)
1787                 return rc;
1788
1789         rc = hashtab_map(p->p_roles.table,
1790                          role_bounds_sanity_check, p);
1791         if (rc)
1792                 return rc;
1793
1794         rc = hashtab_map(p->p_types.table,
1795                          type_bounds_sanity_check, p);
1796         if (rc)
1797                 return rc;
1798
1799         return 0;
1800 }
1801
1802 u16 string_to_security_class(struct policydb *p, const char *name)
1803 {
1804         struct class_datum *cladatum;
1805
1806         cladatum = hashtab_search(p->p_classes.table, name);
1807         if (!cladatum)
1808                 return 0;
1809
1810         return cladatum->value;
1811 }
1812
1813 u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name)
1814 {
1815         struct class_datum *cladatum;
1816         struct perm_datum *perdatum = NULL;
1817         struct common_datum *comdatum;
1818
1819         if (!tclass || tclass > p->p_classes.nprim)
1820                 return 0;
1821
1822         cladatum = p->class_val_to_struct[tclass-1];
1823         comdatum = cladatum->comdatum;
1824         if (comdatum)
1825                 perdatum = hashtab_search(comdatum->permissions.table,
1826                                           name);
1827         if (!perdatum)
1828                 perdatum = hashtab_search(cladatum->permissions.table,
1829                                           name);
1830         if (!perdatum)
1831                 return 0;
1832
1833         return 1U << (perdatum->value-1);
1834 }
1835
1836 static int range_read(struct policydb *p, void *fp)
1837 {
1838         struct range_trans *rt = NULL;
1839         struct mls_range *r = NULL;
1840         int i, rc;
1841         __le32 buf[2];
1842         u32 nel;
1843
1844         if (p->policyvers < POLICYDB_VERSION_MLS)
1845                 return 0;
1846
1847         rc = next_entry(buf, fp, sizeof(u32));
1848         if (rc)
1849                 goto out;
1850
1851         nel = le32_to_cpu(buf[0]);
1852         for (i = 0; i < nel; i++) {
1853                 rc = -ENOMEM;
1854                 rt = kzalloc(sizeof(*rt), GFP_KERNEL);
1855                 if (!rt)
1856                         goto out;
1857
1858                 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1859                 if (rc)
1860                         goto out;
1861
1862                 rt->source_type = le32_to_cpu(buf[0]);
1863                 rt->target_type = le32_to_cpu(buf[1]);
1864                 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
1865                         rc = next_entry(buf, fp, sizeof(u32));
1866                         if (rc)
1867                                 goto out;
1868                         rt->target_class = le32_to_cpu(buf[0]);
1869                 } else
1870                         rt->target_class = p->process_class;
1871
1872                 rc = -EINVAL;
1873                 if (!policydb_type_isvalid(p, rt->source_type) ||
1874                     !policydb_type_isvalid(p, rt->target_type) ||
1875                     !policydb_class_isvalid(p, rt->target_class))
1876                         goto out;
1877
1878                 rc = -ENOMEM;
1879                 r = kzalloc(sizeof(*r), GFP_KERNEL);
1880                 if (!r)
1881                         goto out;
1882
1883                 rc = mls_read_range_helper(r, fp);
1884                 if (rc)
1885                         goto out;
1886
1887                 rc = -EINVAL;
1888                 if (!mls_range_isvalid(p, r)) {
1889                         printk(KERN_WARNING "SELinux:  rangetrans:  invalid range\n");
1890                         goto out;
1891                 }
1892
1893                 rc = hashtab_insert(p->range_tr, rt, r);
1894                 if (rc)
1895                         goto out;
1896
1897                 rt = NULL;
1898                 r = NULL;
1899         }
1900         hash_eval(p->range_tr, "rangetr");
1901         rc = 0;
1902 out:
1903         kfree(rt);
1904         kfree(r);
1905         return rc;
1906 }
1907
1908 static int filename_trans_read(struct policydb *p, void *fp)
1909 {
1910         struct filename_trans *ft;
1911         struct filename_trans_datum *otype;
1912         char *name;
1913         u32 nel, len;
1914         __le32 buf[4];
1915         int rc, i;
1916
1917         if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
1918                 return 0;
1919
1920         rc = next_entry(buf, fp, sizeof(u32));
1921         if (rc)
1922                 return rc;
1923         nel = le32_to_cpu(buf[0]);
1924
1925         for (i = 0; i < nel; i++) {
1926                 ft = NULL;
1927                 otype = NULL;
1928                 name = NULL;
1929
1930                 rc = -ENOMEM;
1931                 ft = kzalloc(sizeof(*ft), GFP_KERNEL);
1932                 if (!ft)
1933                         goto out;
1934
1935                 rc = -ENOMEM;
1936                 otype = kmalloc(sizeof(*otype), GFP_KERNEL);
1937                 if (!otype)
1938                         goto out;
1939
1940                 /* length of the path component string */
1941                 rc = next_entry(buf, fp, sizeof(u32));
1942                 if (rc)
1943                         goto out;
1944                 len = le32_to_cpu(buf[0]);
1945
1946                 /* path component string */
1947                 rc = str_read(&name, GFP_KERNEL, fp, len);
1948                 if (rc)
1949                         goto out;
1950
1951                 ft->name = name;
1952
1953                 rc = next_entry(buf, fp, sizeof(u32) * 4);
1954                 if (rc)
1955                         goto out;
1956
1957                 ft->stype = le32_to_cpu(buf[0]);
1958                 ft->ttype = le32_to_cpu(buf[1]);
1959                 ft->tclass = le32_to_cpu(buf[2]);
1960
1961                 otype->otype = le32_to_cpu(buf[3]);
1962
1963                 rc = ebitmap_set_bit(&p->filename_trans_ttypes, ft->ttype, 1);
1964                 if (rc)
1965                         goto out;
1966
1967                 rc = hashtab_insert(p->filename_trans, ft, otype);
1968                 if (rc) {
1969                         /*
1970                          * Do not return -EEXIST to the caller, or the system
1971                          * will not boot.
1972                          */
1973                         if (rc != -EEXIST)
1974                                 goto out;
1975                         /* But free memory to avoid memory leak. */
1976                         kfree(ft);
1977                         kfree(name);
1978                         kfree(otype);
1979                 }
1980         }
1981         hash_eval(p->filename_trans, "filenametr");
1982         return 0;
1983 out:
1984         kfree(ft);
1985         kfree(name);
1986         kfree(otype);
1987
1988         return rc;
1989 }
1990
1991 static int genfs_read(struct policydb *p, void *fp)
1992 {
1993         int i, j, rc;
1994         u32 nel, nel2, len, len2;
1995         __le32 buf[1];
1996         struct ocontext *l, *c;
1997         struct ocontext *newc = NULL;
1998         struct genfs *genfs_p, *genfs;
1999         struct genfs *newgenfs = NULL;
2000
2001         rc = next_entry(buf, fp, sizeof(u32));
2002         if (rc)
2003                 goto out;
2004         nel = le32_to_cpu(buf[0]);
2005
2006         for (i = 0; i < nel; i++) {
2007                 rc = next_entry(buf, fp, sizeof(u32));
2008                 if (rc)
2009                         goto out;
2010                 len = le32_to_cpu(buf[0]);
2011
2012                 rc = -ENOMEM;
2013                 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
2014                 if (!newgenfs)
2015                         goto out;
2016
2017                 rc = str_read(&newgenfs->fstype, GFP_KERNEL, fp, len);
2018                 if (rc)
2019                         goto out;
2020
2021                 for (genfs_p = NULL, genfs = p->genfs; genfs;
2022                      genfs_p = genfs, genfs = genfs->next) {
2023                         rc = -EINVAL;
2024                         if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
2025                                 printk(KERN_ERR "SELinux:  dup genfs fstype %s\n",
2026                                        newgenfs->fstype);
2027                                 goto out;
2028                         }
2029                         if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
2030                                 break;
2031                 }
2032                 newgenfs->next = genfs;
2033                 if (genfs_p)
2034                         genfs_p->next = newgenfs;
2035                 else
2036                         p->genfs = newgenfs;
2037                 genfs = newgenfs;
2038                 newgenfs = NULL;
2039
2040                 rc = next_entry(buf, fp, sizeof(u32));
2041                 if (rc)
2042                         goto out;
2043
2044                 nel2 = le32_to_cpu(buf[0]);
2045                 for (j = 0; j < nel2; j++) {
2046                         rc = next_entry(buf, fp, sizeof(u32));
2047                         if (rc)
2048                                 goto out;
2049                         len = le32_to_cpu(buf[0]);
2050
2051                         rc = -ENOMEM;
2052                         newc = kzalloc(sizeof(*newc), GFP_KERNEL);
2053                         if (!newc)
2054                                 goto out;
2055
2056                         rc = str_read(&newc->u.name, GFP_KERNEL, fp, len);
2057                         if (rc)
2058                                 goto out;
2059
2060                         rc = next_entry(buf, fp, sizeof(u32));
2061                         if (rc)
2062                                 goto out;
2063
2064                         newc->v.sclass = le32_to_cpu(buf[0]);
2065                         rc = context_read_and_validate(&newc->context[0], p, fp);
2066                         if (rc)
2067                                 goto out;
2068
2069                         for (l = NULL, c = genfs->head; c;
2070                              l = c, c = c->next) {
2071                                 rc = -EINVAL;
2072                                 if (!strcmp(newc->u.name, c->u.name) &&
2073                                     (!c->v.sclass || !newc->v.sclass ||
2074                                      newc->v.sclass == c->v.sclass)) {
2075                                         printk(KERN_ERR "SELinux:  dup genfs entry (%s,%s)\n",
2076                                                genfs->fstype, c->u.name);
2077                                         goto out;
2078                                 }
2079                                 len = strlen(newc->u.name);
2080                                 len2 = strlen(c->u.name);
2081                                 if (len > len2)
2082                                         break;
2083                         }
2084
2085                         newc->next = c;
2086                         if (l)
2087                                 l->next = newc;
2088                         else
2089                                 genfs->head = newc;
2090                         newc = NULL;
2091                 }
2092         }
2093         rc = 0;
2094 out:
2095         if (newgenfs)
2096                 kfree(newgenfs->fstype);
2097         kfree(newgenfs);
2098         ocontext_destroy(newc, OCON_FSUSE);
2099
2100         return rc;
2101 }
2102
2103 static int ocontext_read(struct policydb *p, struct policydb_compat_info *info,
2104                          void *fp)
2105 {
2106         int i, j, rc;
2107         u32 nel, len;
2108         __le32 buf[3];
2109         struct ocontext *l, *c;
2110         u32 nodebuf[8];
2111
2112         for (i = 0; i < info->ocon_num; i++) {
2113                 rc = next_entry(buf, fp, sizeof(u32));
2114                 if (rc)
2115                         goto out;
2116                 nel = le32_to_cpu(buf[0]);
2117
2118                 l = NULL;
2119                 for (j = 0; j < nel; j++) {
2120                         rc = -ENOMEM;
2121                         c = kzalloc(sizeof(*c), GFP_KERNEL);
2122                         if (!c)
2123                                 goto out;
2124                         if (l)
2125                                 l->next = c;
2126                         else
2127                                 p->ocontexts[i] = c;
2128                         l = c;
2129
2130                         switch (i) {
2131                         case OCON_ISID:
2132                                 rc = next_entry(buf, fp, sizeof(u32));
2133                                 if (rc)
2134                                         goto out;
2135
2136                                 c->sid[0] = le32_to_cpu(buf[0]);
2137                                 rc = context_read_and_validate(&c->context[0], p, fp);
2138                                 if (rc)
2139                                         goto out;
2140                                 break;
2141                         case OCON_FS:
2142                         case OCON_NETIF:
2143                                 rc = next_entry(buf, fp, sizeof(u32));
2144                                 if (rc)
2145                                         goto out;
2146                                 len = le32_to_cpu(buf[0]);
2147
2148                                 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2149                                 if (rc)
2150                                         goto out;
2151
2152                                 rc = context_read_and_validate(&c->context[0], p, fp);
2153                                 if (rc)
2154                                         goto out;
2155                                 rc = context_read_and_validate(&c->context[1], p, fp);
2156                                 if (rc)
2157                                         goto out;
2158                                 break;
2159                         case OCON_PORT:
2160                                 rc = next_entry(buf, fp, sizeof(u32)*3);
2161                                 if (rc)
2162                                         goto out;
2163                                 c->u.port.protocol = le32_to_cpu(buf[0]);
2164                                 c->u.port.low_port = le32_to_cpu(buf[1]);
2165                                 c->u.port.high_port = le32_to_cpu(buf[2]);
2166                                 rc = context_read_and_validate(&c->context[0], p, fp);
2167                                 if (rc)
2168                                         goto out;
2169                                 break;
2170                         case OCON_NODE:
2171                                 rc = next_entry(nodebuf, fp, sizeof(u32) * 2);
2172                                 if (rc)
2173                                         goto out;
2174                                 c->u.node.addr = nodebuf[0]; /* network order */
2175                                 c->u.node.mask = nodebuf[1]; /* network order */
2176                                 rc = context_read_and_validate(&c->context[0], p, fp);
2177                                 if (rc)
2178                                         goto out;
2179                                 break;
2180                         case OCON_FSUSE:
2181                                 rc = next_entry(buf, fp, sizeof(u32)*2);
2182                                 if (rc)
2183                                         goto out;
2184
2185                                 rc = -EINVAL;
2186                                 c->v.behavior = le32_to_cpu(buf[0]);
2187                                 /* Determined at runtime, not in policy DB. */
2188                                 if (c->v.behavior == SECURITY_FS_USE_MNTPOINT)
2189                                         goto out;
2190                                 if (c->v.behavior > SECURITY_FS_USE_MAX)
2191                                         goto out;
2192
2193                                 len = le32_to_cpu(buf[1]);
2194                                 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2195                                 if (rc)
2196                                         goto out;
2197
2198                                 rc = context_read_and_validate(&c->context[0], p, fp);
2199                                 if (rc)
2200                                         goto out;
2201                                 break;
2202                         case OCON_NODE6: {
2203                                 int k;
2204
2205                                 rc = next_entry(nodebuf, fp, sizeof(u32) * 8);
2206                                 if (rc)
2207                                         goto out;
2208                                 for (k = 0; k < 4; k++)
2209                                         c->u.node6.addr[k] = nodebuf[k];
2210                                 for (k = 0; k < 4; k++)
2211                                         c->u.node6.mask[k] = nodebuf[k+4];
2212                                 rc = context_read_and_validate(&c->context[0], p, fp);
2213                                 if (rc)
2214                                         goto out;
2215                                 break;
2216                         }
2217                         }
2218                 }
2219         }
2220         rc = 0;
2221 out:
2222         return rc;
2223 }
2224
2225 /*
2226  * Read the configuration data from a policy database binary
2227  * representation file into a policy database structure.
2228  */
2229 int policydb_read(struct policydb *p, void *fp)
2230 {
2231         struct role_allow *ra, *lra;
2232         struct role_trans *tr, *ltr;
2233         int i, j, rc;
2234         __le32 buf[4];
2235         u32 len, nprim, nel;
2236
2237         char *policydb_str;
2238         struct policydb_compat_info *info;
2239
2240         rc = policydb_init(p);
2241         if (rc)
2242                 return rc;
2243
2244         /* Read the magic number and string length. */
2245         rc = next_entry(buf, fp, sizeof(u32) * 2);
2246         if (rc)
2247                 goto bad;
2248
2249         rc = -EINVAL;
2250         if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
2251                 printk(KERN_ERR "SELinux:  policydb magic number 0x%x does "
2252                        "not match expected magic number 0x%x\n",
2253                        le32_to_cpu(buf[0]), POLICYDB_MAGIC);
2254                 goto bad;
2255         }
2256
2257         rc = -EINVAL;
2258         len = le32_to_cpu(buf[1]);
2259         if (len != strlen(POLICYDB_STRING)) {
2260                 printk(KERN_ERR "SELinux:  policydb string length %d does not "
2261                        "match expected length %Zu\n",
2262                        len, strlen(POLICYDB_STRING));
2263                 goto bad;
2264         }
2265
2266         rc = -ENOMEM;
2267         policydb_str = kmalloc(len + 1, GFP_KERNEL);
2268         if (!policydb_str) {
2269                 printk(KERN_ERR "SELinux:  unable to allocate memory for policydb "
2270                        "string of length %d\n", len);
2271                 goto bad;
2272         }
2273
2274         rc = next_entry(policydb_str, fp, len);
2275         if (rc) {
2276                 printk(KERN_ERR "SELinux:  truncated policydb string identifier\n");
2277                 kfree(policydb_str);
2278                 goto bad;
2279         }
2280
2281         rc = -EINVAL;
2282         policydb_str[len] = '\0';
2283         if (strcmp(policydb_str, POLICYDB_STRING)) {
2284                 printk(KERN_ERR "SELinux:  policydb string %s does not match "
2285                        "my string %s\n", policydb_str, POLICYDB_STRING);
2286                 kfree(policydb_str);
2287                 goto bad;
2288         }
2289         /* Done with policydb_str. */
2290         kfree(policydb_str);
2291         policydb_str = NULL;
2292
2293         /* Read the version and table sizes. */
2294         rc = next_entry(buf, fp, sizeof(u32)*4);
2295         if (rc)
2296                 goto bad;
2297
2298         rc = -EINVAL;
2299         p->policyvers = le32_to_cpu(buf[0]);
2300         if (p->policyvers < POLICYDB_VERSION_MIN ||
2301             p->policyvers > POLICYDB_VERSION_MAX) {
2302                 printk(KERN_ERR "SELinux:  policydb version %d does not match "
2303                        "my version range %d-%d\n",
2304                        le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
2305                 goto bad;
2306         }
2307
2308         if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
2309                 p->mls_enabled = 1;
2310
2311                 rc = -EINVAL;
2312                 if (p->policyvers < POLICYDB_VERSION_MLS) {
2313                         printk(KERN_ERR "SELinux: security policydb version %d "
2314                                 "(MLS) not backwards compatible\n",
2315                                 p->policyvers);
2316                         goto bad;
2317                 }
2318         }
2319         p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
2320         p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
2321
2322         if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
2323                 rc = ebitmap_read(&p->policycaps, fp);
2324                 if (rc)
2325                         goto bad;
2326         }
2327
2328         if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
2329                 rc = ebitmap_read(&p->permissive_map, fp);
2330                 if (rc)
2331                         goto bad;
2332         }
2333
2334         rc = -EINVAL;
2335         info = policydb_lookup_compat(p->policyvers);
2336         if (!info) {
2337                 printk(KERN_ERR "SELinux:  unable to find policy compat info "
2338                        "for version %d\n", p->policyvers);
2339                 goto bad;
2340         }
2341
2342         rc = -EINVAL;
2343         if (le32_to_cpu(buf[2]) != info->sym_num ||
2344                 le32_to_cpu(buf[3]) != info->ocon_num) {
2345                 printk(KERN_ERR "SELinux:  policydb table sizes (%d,%d) do "
2346                        "not match mine (%d,%d)\n", le32_to_cpu(buf[2]),
2347                         le32_to_cpu(buf[3]),
2348                        info->sym_num, info->ocon_num);
2349                 goto bad;
2350         }
2351
2352         for (i = 0; i < info->sym_num; i++) {
2353                 rc = next_entry(buf, fp, sizeof(u32)*2);
2354                 if (rc)
2355                         goto bad;
2356                 nprim = le32_to_cpu(buf[0]);
2357                 nel = le32_to_cpu(buf[1]);
2358                 for (j = 0; j < nel; j++) {
2359                         rc = read_f[i](p, p->symtab[i].table, fp);
2360                         if (rc)
2361                                 goto bad;
2362                 }
2363
2364                 p->symtab[i].nprim = nprim;
2365         }
2366
2367         rc = -EINVAL;
2368         p->process_class = string_to_security_class(p, "process");
2369         if (!p->process_class)
2370                 goto bad;
2371
2372         rc = avtab_read(&p->te_avtab, fp, p);
2373         if (rc)
2374                 goto bad;
2375
2376         if (p->policyvers >= POLICYDB_VERSION_BOOL) {
2377                 rc = cond_read_list(p, fp);
2378                 if (rc)
2379                         goto bad;
2380         }
2381
2382         rc = next_entry(buf, fp, sizeof(u32));
2383         if (rc)
2384                 goto bad;
2385         nel = le32_to_cpu(buf[0]);
2386         ltr = NULL;
2387         for (i = 0; i < nel; i++) {
2388                 rc = -ENOMEM;
2389                 tr = kzalloc(sizeof(*tr), GFP_KERNEL);
2390                 if (!tr)
2391                         goto bad;
2392                 if (ltr)
2393                         ltr->next = tr;
2394                 else
2395                         p->role_tr = tr;
2396                 rc = next_entry(buf, fp, sizeof(u32)*3);
2397                 if (rc)
2398                         goto bad;
2399
2400                 rc = -EINVAL;
2401                 tr->role = le32_to_cpu(buf[0]);
2402                 tr->type = le32_to_cpu(buf[1]);
2403                 tr->new_role = le32_to_cpu(buf[2]);
2404                 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2405                         rc = next_entry(buf, fp, sizeof(u32));
2406                         if (rc)
2407                                 goto bad;
2408                         tr->tclass = le32_to_cpu(buf[0]);
2409                 } else
2410                         tr->tclass = p->process_class;
2411
2412                 if (!policydb_role_isvalid(p, tr->role) ||
2413                     !policydb_type_isvalid(p, tr->type) ||
2414                     !policydb_class_isvalid(p, tr->tclass) ||
2415                     !policydb_role_isvalid(p, tr->new_role))
2416                         goto bad;
2417                 ltr = tr;
2418         }
2419
2420         rc = next_entry(buf, fp, sizeof(u32));
2421         if (rc)
2422                 goto bad;
2423         nel = le32_to_cpu(buf[0]);
2424         lra = NULL;
2425         for (i = 0; i < nel; i++) {
2426                 rc = -ENOMEM;
2427                 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
2428                 if (!ra)
2429                         goto bad;
2430                 if (lra)
2431                         lra->next = ra;
2432                 else
2433                         p->role_allow = ra;
2434                 rc = next_entry(buf, fp, sizeof(u32)*2);
2435                 if (rc)
2436                         goto bad;
2437
2438                 rc = -EINVAL;
2439                 ra->role = le32_to_cpu(buf[0]);
2440                 ra->new_role = le32_to_cpu(buf[1]);
2441                 if (!policydb_role_isvalid(p, ra->role) ||
2442                     !policydb_role_isvalid(p, ra->new_role))
2443                         goto bad;
2444                 lra = ra;
2445         }
2446
2447         rc = filename_trans_read(p, fp);
2448         if (rc)
2449                 goto bad;
2450
2451         rc = policydb_index(p);
2452         if (rc)
2453                 goto bad;
2454
2455         rc = -EINVAL;
2456         p->process_trans_perms = string_to_av_perm(p, p->process_class, "transition");
2457         p->process_trans_perms |= string_to_av_perm(p, p->process_class, "dyntransition");
2458         if (!p->process_trans_perms)
2459                 goto bad;
2460
2461         rc = ocontext_read(p, info, fp);
2462         if (rc)
2463                 goto bad;
2464
2465         rc = genfs_read(p, fp);
2466         if (rc)
2467                 goto bad;
2468
2469         rc = range_read(p, fp);
2470         if (rc)
2471                 goto bad;
2472
2473         rc = -ENOMEM;
2474         p->type_attr_map_array = flex_array_alloc(sizeof(struct ebitmap),
2475                                                   p->p_types.nprim,
2476                                                   GFP_KERNEL | __GFP_ZERO);
2477         if (!p->type_attr_map_array)
2478                 goto bad;
2479
2480         /* preallocate so we don't have to worry about the put ever failing */
2481         rc = flex_array_prealloc(p->type_attr_map_array, 0, p->p_types.nprim,
2482                                  GFP_KERNEL | __GFP_ZERO);
2483         if (rc)
2484                 goto bad;
2485
2486         for (i = 0; i < p->p_types.nprim; i++) {
2487                 struct ebitmap *e = flex_array_get(p->type_attr_map_array, i);
2488
2489                 BUG_ON(!e);
2490                 ebitmap_init(e);
2491                 if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
2492                         rc = ebitmap_read(e, fp);
2493                         if (rc)
2494                                 goto bad;
2495                 }
2496                 /* add the type itself as the degenerate case */
2497                 rc = ebitmap_set_bit(e, i, 1);
2498                 if (rc)
2499                         goto bad;
2500         }
2501
2502         rc = policydb_bounds_sanity_check(p);
2503         if (rc)
2504                 goto bad;
2505
2506         rc = 0;
2507 out:
2508         return rc;
2509 bad:
2510         policydb_destroy(p);
2511         goto out;
2512 }
2513
2514 /*
2515  * Write a MLS level structure to a policydb binary
2516  * representation file.
2517  */
2518 static int mls_write_level(struct mls_level *l, void *fp)
2519 {
2520         __le32 buf[1];
2521         int rc;
2522
2523         buf[0] = cpu_to_le32(l->sens);
2524         rc = put_entry(buf, sizeof(u32), 1, fp);
2525         if (rc)
2526                 return rc;
2527
2528         rc = ebitmap_write(&l->cat, fp);
2529         if (rc)
2530                 return rc;
2531
2532         return 0;
2533 }
2534
2535 /*
2536  * Write a MLS range structure to a policydb binary
2537  * representation file.
2538  */
2539 static int mls_write_range_helper(struct mls_range *r, void *fp)
2540 {
2541         __le32 buf[3];
2542         size_t items;
2543         int rc, eq;
2544
2545         eq = mls_level_eq(&r->level[1], &r->level[0]);
2546
2547         if (eq)
2548                 items = 2;
2549         else
2550                 items = 3;
2551         buf[0] = cpu_to_le32(items-1);
2552         buf[1] = cpu_to_le32(r->level[0].sens);
2553         if (!eq)
2554                 buf[2] = cpu_to_le32(r->level[1].sens);
2555
2556         BUG_ON(items > ARRAY_SIZE(buf));
2557
2558         rc = put_entry(buf, sizeof(u32), items, fp);
2559         if (rc)
2560                 return rc;
2561
2562         rc = ebitmap_write(&r->level[0].cat, fp);
2563         if (rc)
2564                 return rc;
2565         if (!eq) {
2566                 rc = ebitmap_write(&r->level[1].cat, fp);
2567                 if (rc)
2568                         return rc;
2569         }
2570
2571         return 0;
2572 }
2573
2574 static int sens_write(void *vkey, void *datum, void *ptr)
2575 {
2576         char *key = vkey;
2577         struct level_datum *levdatum = datum;
2578         struct policy_data *pd = ptr;
2579         void *fp = pd->fp;
2580         __le32 buf[2];
2581         size_t len;
2582         int rc;
2583
2584         len = strlen(key);
2585         buf[0] = cpu_to_le32(len);
2586         buf[1] = cpu_to_le32(levdatum->isalias);
2587         rc = put_entry(buf, sizeof(u32), 2, fp);
2588         if (rc)
2589                 return rc;
2590
2591         rc = put_entry(key, 1, len, fp);
2592         if (rc)
2593                 return rc;
2594
2595         rc = mls_write_level(levdatum->level, fp);
2596         if (rc)
2597                 return rc;
2598
2599         return 0;
2600 }
2601
2602 static int cat_write(void *vkey, void *datum, void *ptr)
2603 {
2604         char *key = vkey;
2605         struct cat_datum *catdatum = datum;
2606         struct policy_data *pd = ptr;
2607         void *fp = pd->fp;
2608         __le32 buf[3];
2609         size_t len;
2610         int rc;
2611
2612         len = strlen(key);
2613         buf[0] = cpu_to_le32(len);
2614         buf[1] = cpu_to_le32(catdatum->value);
2615         buf[2] = cpu_to_le32(catdatum->isalias);
2616         rc = put_entry(buf, sizeof(u32), 3, fp);
2617         if (rc)
2618                 return rc;
2619
2620         rc = put_entry(key, 1, len, fp);
2621         if (rc)
2622                 return rc;
2623
2624         return 0;
2625 }
2626
2627 static int role_trans_write(struct policydb *p, void *fp)
2628 {
2629         struct role_trans *r = p->role_tr;
2630         struct role_trans *tr;
2631         u32 buf[3];
2632         size_t nel;
2633         int rc;
2634
2635         nel = 0;
2636         for (tr = r; tr; tr = tr->next)
2637                 nel++;
2638         buf[0] = cpu_to_le32(nel);
2639         rc = put_entry(buf, sizeof(u32), 1, fp);
2640         if (rc)
2641                 return rc;
2642         for (tr = r; tr; tr = tr->next) {
2643                 buf[0] = cpu_to_le32(tr->role);
2644                 buf[1] = cpu_to_le32(tr->type);
2645                 buf[2] = cpu_to_le32(tr->new_role);
2646                 rc = put_entry(buf, sizeof(u32), 3, fp);
2647                 if (rc)
2648                         return rc;
2649                 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2650                         buf[0] = cpu_to_le32(tr->tclass);
2651                         rc = put_entry(buf, sizeof(u32), 1, fp);
2652                         if (rc)
2653                                 return rc;
2654                 }
2655         }
2656
2657         return 0;
2658 }
2659
2660 static int role_allow_write(struct role_allow *r, void *fp)
2661 {
2662         struct role_allow *ra;
2663         u32 buf[2];
2664         size_t nel;
2665         int rc;
2666
2667         nel = 0;
2668         for (ra = r; ra; ra = ra->next)
2669                 nel++;
2670         buf[0] = cpu_to_le32(nel);
2671         rc = put_entry(buf, sizeof(u32), 1, fp);
2672         if (rc)
2673                 return rc;
2674         for (ra = r; ra; ra = ra->next) {
2675                 buf[0] = cpu_to_le32(ra->role);
2676                 buf[1] = cpu_to_le32(ra->new_role);
2677                 rc = put_entry(buf, sizeof(u32), 2, fp);
2678                 if (rc)
2679                         return rc;
2680         }
2681         return 0;
2682 }
2683
2684 /*
2685  * Write a security context structure
2686  * to a policydb binary representation file.
2687  */
2688 static int context_write(struct policydb *p, struct context *c,
2689                          void *fp)
2690 {
2691         int rc;
2692         __le32 buf[3];
2693
2694         buf[0] = cpu_to_le32(c->user);
2695         buf[1] = cpu_to_le32(c->role);
2696         buf[2] = cpu_to_le32(c->type);
2697
2698         rc = put_entry(buf, sizeof(u32), 3, fp);
2699         if (rc)
2700                 return rc;
2701
2702         rc = mls_write_range_helper(&c->range, fp);
2703         if (rc)
2704                 return rc;
2705
2706         return 0;
2707 }
2708
2709 /*
2710  * The following *_write functions are used to
2711  * write the symbol data to a policy database
2712  * binary representation file.
2713  */
2714
2715 static int perm_write(void *vkey, void *datum, void *fp)
2716 {
2717         char *key = vkey;
2718         struct perm_datum *perdatum = datum;
2719         __le32 buf[2];
2720         size_t len;
2721         int rc;
2722
2723         len = strlen(key);
2724         buf[0] = cpu_to_le32(len);
2725         buf[1] = cpu_to_le32(perdatum->value);
2726         rc = put_entry(buf, sizeof(u32), 2, fp);
2727         if (rc)
2728                 return rc;
2729
2730         rc = put_entry(key, 1, len, fp);
2731         if (rc)
2732                 return rc;
2733
2734         return 0;
2735 }
2736
2737 static int common_write(void *vkey, void *datum, void *ptr)
2738 {
2739         char *key = vkey;
2740         struct common_datum *comdatum = datum;
2741         struct policy_data *pd = ptr;
2742         void *fp = pd->fp;
2743         __le32 buf[4];
2744         size_t len;
2745         int rc;
2746
2747         len = strlen(key);
2748         buf[0] = cpu_to_le32(len);
2749         buf[1] = cpu_to_le32(comdatum->value);
2750         buf[2] = cpu_to_le32(comdatum->permissions.nprim);
2751         buf[3] = cpu_to_le32(comdatum->permissions.table->nel);
2752         rc = put_entry(buf, sizeof(u32), 4, fp);
2753         if (rc)
2754                 return rc;
2755
2756         rc = put_entry(key, 1, len, fp);
2757         if (rc)
2758                 return rc;
2759
2760         rc = hashtab_map(comdatum->permissions.table, perm_write, fp);
2761         if (rc)
2762                 return rc;
2763
2764         return 0;
2765 }
2766
2767 static int type_set_write(struct type_set *t, void *fp)
2768 {
2769         int rc;
2770         __le32 buf[1];
2771
2772         if (ebitmap_write(&t->types, fp))
2773                 return -EINVAL;
2774         if (ebitmap_write(&t->negset, fp))
2775                 return -EINVAL;
2776
2777         buf[0] = cpu_to_le32(t->flags);
2778         rc = put_entry(buf, sizeof(u32), 1, fp);
2779         if (rc)
2780                 return -EINVAL;
2781
2782         return 0;
2783 }
2784
2785 static int write_cons_helper(struct policydb *p, struct constraint_node *node,
2786                              void *fp)
2787 {
2788         struct constraint_node *c;
2789         struct constraint_expr *e;
2790         __le32 buf[3];
2791         u32 nel;
2792         int rc;
2793
2794         for (c = node; c; c = c->next) {
2795                 nel = 0;
2796                 for (e = c->expr; e; e = e->next)
2797                         nel++;
2798                 buf[0] = cpu_to_le32(c->permissions);
2799                 buf[1] = cpu_to_le32(nel);
2800                 rc = put_entry(buf, sizeof(u32), 2, fp);
2801                 if (rc)
2802                         return rc;
2803                 for (e = c->expr; e; e = e->next) {
2804                         buf[0] = cpu_to_le32(e->expr_type);
2805                         buf[1] = cpu_to_le32(e->attr);
2806                         buf[2] = cpu_to_le32(e->op);
2807                         rc = put_entry(buf, sizeof(u32), 3, fp);
2808                         if (rc)
2809                                 return rc;
2810
2811                         switch (e->expr_type) {
2812                         case CEXPR_NAMES:
2813                                 rc = ebitmap_write(&e->names, fp);
2814                                 if (rc)
2815                                         return rc;
2816                                 if (p->policyvers >=
2817                                         POLICYDB_VERSION_CONSTRAINT_NAMES) {
2818                                         rc = type_set_write(e->type_names, fp);
2819                                         if (rc)
2820                                                 return rc;
2821                                 }
2822                                 break;
2823                         default:
2824                                 break;
2825                         }
2826                 }
2827         }
2828
2829         return 0;
2830 }
2831
2832 static int class_write(void *vkey, void *datum, void *ptr)
2833 {
2834         char *key = vkey;
2835         struct class_datum *cladatum = datum;
2836         struct policy_data *pd = ptr;
2837         void *fp = pd->fp;
2838         struct policydb *p = pd->p;
2839         struct constraint_node *c;
2840         __le32 buf[6];
2841         u32 ncons;
2842         size_t len, len2;
2843         int rc;
2844
2845         len = strlen(key);
2846         if (cladatum->comkey)
2847                 len2 = strlen(cladatum->comkey);
2848         else
2849                 len2 = 0;
2850
2851         ncons = 0;
2852         for (c = cladatum->constraints; c; c = c->next)
2853                 ncons++;
2854
2855         buf[0] = cpu_to_le32(len);
2856         buf[1] = cpu_to_le32(len2);
2857         buf[2] = cpu_to_le32(cladatum->value);
2858         buf[3] = cpu_to_le32(cladatum->permissions.nprim);
2859         if (cladatum->permissions.table)
2860                 buf[4] = cpu_to_le32(cladatum->permissions.table->nel);
2861         else
2862                 buf[4] = 0;
2863         buf[5] = cpu_to_le32(ncons);
2864         rc = put_entry(buf, sizeof(u32), 6, fp);
2865         if (rc)
2866                 return rc;
2867
2868         rc = put_entry(key, 1, len, fp);
2869         if (rc)
2870                 return rc;
2871
2872         if (cladatum->comkey) {
2873                 rc = put_entry(cladatum->comkey, 1, len2, fp);
2874                 if (rc)
2875                         return rc;
2876         }
2877
2878         rc = hashtab_map(cladatum->permissions.table, perm_write, fp);
2879         if (rc)
2880                 return rc;
2881
2882         rc = write_cons_helper(p, cladatum->constraints, fp);
2883         if (rc)
2884                 return rc;
2885
2886         /* write out the validatetrans rule */
2887         ncons = 0;
2888         for (c = cladatum->validatetrans; c; c = c->next)
2889                 ncons++;
2890
2891         buf[0] = cpu_to_le32(ncons);
2892         rc = put_entry(buf, sizeof(u32), 1, fp);
2893         if (rc)
2894                 return rc;
2895
2896         rc = write_cons_helper(p, cladatum->validatetrans, fp);
2897         if (rc)
2898                 return rc;
2899
2900         if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
2901                 buf[0] = cpu_to_le32(cladatum->default_user);
2902                 buf[1] = cpu_to_le32(cladatum->default_role);
2903                 buf[2] = cpu_to_le32(cladatum->default_range);
2904
2905                 rc = put_entry(buf, sizeof(uint32_t), 3, fp);
2906                 if (rc)
2907                         return rc;
2908         }
2909
2910         if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
2911                 buf[0] = cpu_to_le32(cladatum->default_type);
2912                 rc = put_entry(buf, sizeof(uint32_t), 1, fp);
2913                 if (rc)
2914                         return rc;
2915         }
2916
2917         return 0;
2918 }
2919
2920 static int role_write(void *vkey, void *datum, void *ptr)
2921 {
2922         char *key = vkey;
2923         struct role_datum *role = datum;
2924         struct policy_data *pd = ptr;
2925         void *fp = pd->fp;
2926         struct policydb *p = pd->p;
2927         __le32 buf[3];
2928         size_t items, len;
2929         int rc;
2930
2931         len = strlen(key);
2932         items = 0;
2933         buf[items++] = cpu_to_le32(len);
2934         buf[items++] = cpu_to_le32(role->value);
2935         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
2936                 buf[items++] = cpu_to_le32(role->bounds);
2937
2938         BUG_ON(items > ARRAY_SIZE(buf));
2939
2940         rc = put_entry(buf, sizeof(u32), items, fp);
2941         if (rc)
2942                 return rc;
2943
2944         rc = put_entry(key, 1, len, fp);
2945         if (rc)
2946                 return rc;
2947
2948         rc = ebitmap_write(&role->dominates, fp);
2949         if (rc)
2950                 return rc;
2951
2952         rc = ebitmap_write(&role->types, fp);
2953         if (rc)
2954                 return rc;
2955
2956         return 0;
2957 }
2958
2959 static int type_write(void *vkey, void *datum, void *ptr)
2960 {
2961         char *key = vkey;
2962         struct type_datum *typdatum = datum;
2963         struct policy_data *pd = ptr;
2964         struct policydb *p = pd->p;
2965         void *fp = pd->fp;
2966         __le32 buf[4];
2967         int rc;
2968         size_t items, len;
2969
2970         len = strlen(key);
2971         items = 0;
2972         buf[items++] = cpu_to_le32(len);
2973         buf[items++] = cpu_to_le32(typdatum->value);
2974         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
2975                 u32 properties = 0;
2976
2977                 if (typdatum->primary)
2978                         properties |= TYPEDATUM_PROPERTY_PRIMARY;
2979
2980                 if (typdatum->attribute)
2981                         properties |= TYPEDATUM_PROPERTY_ATTRIBUTE;
2982
2983                 buf[items++] = cpu_to_le32(properties);
2984                 buf[items++] = cpu_to_le32(typdatum->bounds);
2985         } else {
2986                 buf[items++] = cpu_to_le32(typdatum->primary);
2987         }
2988         BUG_ON(items > ARRAY_SIZE(buf));
2989         rc = put_entry(buf, sizeof(u32), items, fp);
2990         if (rc)
2991                 return rc;
2992
2993         rc = put_entry(key, 1, len, fp);
2994         if (rc)
2995                 return rc;
2996
2997         return 0;
2998 }
2999
3000 static int user_write(void *vkey, void *datum, void *ptr)
3001 {
3002         char *key = vkey;
3003         struct user_datum *usrdatum = datum;
3004         struct policy_data *pd = ptr;
3005         struct policydb *p = pd->p;
3006         void *fp = pd->fp;
3007         __le32 buf[3];
3008         size_t items, len;
3009         int rc;
3010
3011         len = strlen(key);
3012         items = 0;
3013         buf[items++] = cpu_to_le32(len);
3014         buf[items++] = cpu_to_le32(usrdatum->value);
3015         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
3016                 buf[items++] = cpu_to_le32(usrdatum->bounds);
3017         BUG_ON(items > ARRAY_SIZE(buf));
3018         rc = put_entry(buf, sizeof(u32), items, fp);
3019         if (rc)
3020                 return rc;
3021
3022         rc = put_entry(key, 1, len, fp);
3023         if (rc)
3024                 return rc;
3025
3026         rc = ebitmap_write(&usrdatum->roles, fp);
3027         if (rc)
3028                 return rc;
3029
3030         rc = mls_write_range_helper(&usrdatum->range, fp);
3031         if (rc)
3032                 return rc;
3033
3034         rc = mls_write_level(&usrdatum->dfltlevel, fp);
3035         if (rc)
3036                 return rc;
3037
3038         return 0;
3039 }
3040
3041 static int (*write_f[SYM_NUM]) (void *key, void *datum,
3042                                 void *datap) =
3043 {
3044         common_write,
3045         class_write,
3046         role_write,
3047         type_write,
3048         user_write,
3049         cond_write_bool,
3050         sens_write,
3051         cat_write,
3052 };
3053
3054 static int ocontext_write(struct policydb *p, struct policydb_compat_info *info,
3055                           void *fp)
3056 {
3057         unsigned int i, j, rc;
3058         size_t nel, len;
3059         __le32 buf[3];
3060         u32 nodebuf[8];
3061         struct ocontext *c;
3062         for (i = 0; i < info->ocon_num; i++) {
3063                 nel = 0;
3064                 for (c = p->ocontexts[i]; c; c = c->next)
3065                         nel++;
3066                 buf[0] = cpu_to_le32(nel);
3067                 rc = put_entry(buf, sizeof(u32), 1, fp);
3068                 if (rc)
3069                         return rc;
3070                 for (c = p->ocontexts[i]; c; c = c->next) {
3071                         switch (i) {
3072                         case OCON_ISID:
3073                                 buf[0] = cpu_to_le32(c->sid[0]);
3074                                 rc = put_entry(buf, sizeof(u32), 1, fp);
3075                                 if (rc)
3076                                         return rc;
3077                                 rc = context_write(p, &c->context[0], fp);
3078                                 if (rc)
3079                                         return rc;
3080                                 break;
3081                         case OCON_FS:
3082                         case OCON_NETIF:
3083                                 len = strlen(c->u.name);
3084                                 buf[0] = cpu_to_le32(len);
3085                                 rc = put_entry(buf, sizeof(u32), 1, fp);
3086                                 if (rc)
3087                                         return rc;
3088                                 rc = put_entry(c->u.name, 1, len, fp);
3089                                 if (rc)
3090                                         return rc;
3091                                 rc = context_write(p, &c->context[0], fp);
3092                                 if (rc)
3093                                         return rc;
3094                                 rc = context_write(p, &c->context[1], fp);
3095                                 if (rc)
3096                                         return rc;
3097                                 break;
3098                         case OCON_PORT:
3099                                 buf[0] = cpu_to_le32(c->u.port.protocol);
3100                                 buf[1] = cpu_to_le32(c->u.port.low_port);
3101                                 buf[2] = cpu_to_le32(c->u.port.high_port);
3102                                 rc = put_entry(buf, sizeof(u32), 3, fp);
3103                                 if (rc)
3104                                         return rc;
3105                                 rc = context_write(p, &c->context[0], fp);
3106                                 if (rc)
3107                                         return rc;
3108                                 break;
3109                         case OCON_NODE:
3110                                 nodebuf[0] = c->u.node.addr; /* network order */
3111                                 nodebuf[1] = c->u.node.mask; /* network order */
3112                                 rc = put_entry(nodebuf, sizeof(u32), 2, fp);
3113                                 if (rc)
3114                                         return rc;
3115                                 rc = context_write(p, &c->context[0], fp);
3116                                 if (rc)
3117                                         return rc;
3118                                 break;
3119                         case OCON_FSUSE:
3120                                 buf[0] = cpu_to_le32(c->v.behavior);
3121                                 len = strlen(c->u.name);
3122                                 buf[1] = cpu_to_le32(len);
3123                                 rc = put_entry(buf, sizeof(u32), 2, fp);
3124                                 if (rc)
3125                                         return rc;
3126                                 rc = put_entry(c->u.name, 1, len, fp);
3127                                 if (rc)
3128                                         return rc;
3129                                 rc = context_write(p, &c->context[0], fp);
3130                                 if (rc)
3131                                         return rc;
3132                                 break;
3133                         case OCON_NODE6:
3134                                 for (j = 0; j < 4; j++)
3135                                         nodebuf[j] = c->u.node6.addr[j]; /* network order */
3136                                 for (j = 0; j < 4; j++)
3137                                         nodebuf[j + 4] = c->u.node6.mask[j]; /* network order */
3138                                 rc = put_entry(nodebuf, sizeof(u32), 8, fp);
3139                                 if (rc)
3140                                         return rc;
3141                                 rc = context_write(p, &c->context[0], fp);
3142                                 if (rc)
3143                                         return rc;
3144                                 break;
3145                         }
3146                 }
3147         }
3148         return 0;
3149 }
3150
3151 static int genfs_write(struct policydb *p, void *fp)
3152 {
3153         struct genfs *genfs;
3154         struct ocontext *c;
3155         size_t len;
3156         __le32 buf[1];
3157         int rc;
3158
3159         len = 0;
3160         for (genfs = p->genfs; genfs; genfs = genfs->next)
3161                 len++;
3162         buf[0] = cpu_to_le32(len);
3163         rc = put_entry(buf, sizeof(u32), 1, fp);
3164         if (rc)
3165                 return rc;
3166         for (genfs = p->genfs; genfs; genfs = genfs->next) {
3167                 len = strlen(genfs->fstype);
3168                 buf[0] = cpu_to_le32(len);
3169                 rc = put_entry(buf, sizeof(u32), 1, fp);
3170                 if (rc)
3171                         return rc;
3172                 rc = put_entry(genfs->fstype, 1, len, fp);
3173                 if (rc)
3174                         return rc;
3175                 len = 0;
3176                 for (c = genfs->head; c; c = c->next)
3177                         len++;
3178                 buf[0] = cpu_to_le32(len);
3179                 rc = put_entry(buf, sizeof(u32), 1, fp);
3180                 if (rc)
3181                         return rc;
3182                 for (c = genfs->head; c; c = c->next) {
3183                         len = strlen(c->u.name);
3184                         buf[0] = cpu_to_le32(len);
3185                         rc = put_entry(buf, sizeof(u32), 1, fp);
3186                         if (rc)
3187                                 return rc;
3188                         rc = put_entry(c->u.name, 1, len, fp);
3189                         if (rc)
3190                                 return rc;
3191                         buf[0] = cpu_to_le32(c->v.sclass);
3192                         rc = put_entry(buf, sizeof(u32), 1, fp);
3193                         if (rc)
3194                                 return rc;
3195                         rc = context_write(p, &c->context[0], fp);
3196                         if (rc)
3197                                 return rc;
3198                 }
3199         }
3200         return 0;
3201 }
3202
3203 static int hashtab_cnt(void *key, void *data, void *ptr)
3204 {
3205         int *cnt = ptr;
3206         *cnt = *cnt + 1;
3207
3208         return 0;
3209 }
3210
3211 static int range_write_helper(void *key, void *data, void *ptr)
3212 {
3213         __le32 buf[2];
3214         struct range_trans *rt = key;
3215         struct mls_range *r = data;
3216         struct policy_data *pd = ptr;
3217         void *fp = pd->fp;
3218         struct policydb *p = pd->p;
3219         int rc;
3220
3221         buf[0] = cpu_to_le32(rt->source_type);
3222         buf[1] = cpu_to_le32(rt->target_type);
3223         rc = put_entry(buf, sizeof(u32), 2, fp);
3224         if (rc)
3225                 return rc;
3226         if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
3227                 buf[0] = cpu_to_le32(rt->target_class);
3228                 rc = put_entry(buf, sizeof(u32), 1, fp);
3229                 if (rc)
3230                         return rc;
3231         }
3232         rc = mls_write_range_helper(r, fp);
3233         if (rc)
3234                 return rc;
3235
3236         return 0;
3237 }
3238
3239 static int range_write(struct policydb *p, void *fp)
3240 {
3241         __le32 buf[1];
3242         int rc, nel;
3243         struct policy_data pd;
3244
3245         pd.p = p;
3246         pd.fp = fp;
3247
3248         /* count the number of entries in the hashtab */
3249         nel = 0;
3250         rc = hashtab_map(p->range_tr, hashtab_cnt, &nel);
3251         if (rc)
3252                 return rc;
3253
3254         buf[0] = cpu_to_le32(nel);
3255         rc = put_entry(buf, sizeof(u32), 1, fp);
3256         if (rc)
3257                 return rc;
3258
3259         /* actually write all of the entries */
3260         rc = hashtab_map(p->range_tr, range_write_helper, &pd);
3261         if (rc)
3262                 return rc;
3263
3264         return 0;
3265 }
3266
3267 static int filename_write_helper(void *key, void *data, void *ptr)
3268 {
3269         __le32 buf[4];
3270         struct filename_trans *ft = key;
3271         struct filename_trans_datum *otype = data;
3272         void *fp = ptr;
3273         int rc;
3274         u32 len;
3275
3276         len = strlen(ft->name);
3277         buf[0] = cpu_to_le32(len);
3278         rc = put_entry(buf, sizeof(u32), 1, fp);
3279         if (rc)
3280                 return rc;
3281
3282         rc = put_entry(ft->name, sizeof(char), len, fp);
3283         if (rc)
3284                 return rc;
3285
3286         buf[0] = cpu_to_le32(ft->stype);
3287         buf[1] = cpu_to_le32(ft->ttype);
3288         buf[2] = cpu_to_le32(ft->tclass);
3289         buf[3] = cpu_to_le32(otype->otype);
3290
3291         rc = put_entry(buf, sizeof(u32), 4, fp);
3292         if (rc)
3293                 return rc;
3294
3295         return 0;
3296 }
3297
3298 static int filename_trans_write(struct policydb *p, void *fp)
3299 {
3300         u32 nel;
3301         __le32 buf[1];
3302         int rc;
3303
3304         if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
3305                 return 0;
3306
3307         nel = 0;
3308         rc = hashtab_map(p->filename_trans, hashtab_cnt, &nel);
3309         if (rc)
3310                 return rc;
3311
3312         buf[0] = cpu_to_le32(nel);
3313         rc = put_entry(buf, sizeof(u32), 1, fp);
3314         if (rc)
3315                 return rc;
3316
3317         rc = hashtab_map(p->filename_trans, filename_write_helper, fp);
3318         if (rc)
3319                 return rc;
3320
3321         return 0;
3322 }
3323
3324 /*
3325  * Write the configuration data in a policy database
3326  * structure to a policy database binary representation
3327  * file.
3328  */
3329 int policydb_write(struct policydb *p, void *fp)
3330 {
3331         unsigned int i, num_syms;
3332         int rc;
3333         __le32 buf[4];
3334         u32 config;
3335         size_t len;
3336         struct policydb_compat_info *info;
3337
3338         /*
3339          * refuse to write policy older than compressed avtab
3340          * to simplify the writer.  There are other tests dropped
3341          * since we assume this throughout the writer code.  Be
3342          * careful if you ever try to remove this restriction
3343          */
3344         if (p->policyvers < POLICYDB_VERSION_AVTAB) {
3345                 printk(KERN_ERR "SELinux: refusing to write policy version %d."
3346                        "  Because it is less than version %d\n", p->policyvers,
3347                        POLICYDB_VERSION_AVTAB);
3348                 return -EINVAL;
3349         }
3350
3351         config = 0;
3352         if (p->mls_enabled)
3353                 config |= POLICYDB_CONFIG_MLS;
3354
3355         if (p->reject_unknown)
3356                 config |= REJECT_UNKNOWN;
3357         if (p->allow_unknown)
3358                 config |= ALLOW_UNKNOWN;
3359
3360         /* Write the magic number and string identifiers. */
3361         buf[0] = cpu_to_le32(POLICYDB_MAGIC);
3362         len = strlen(POLICYDB_STRING);
3363         buf[1] = cpu_to_le32(len);
3364         rc = put_entry(buf, sizeof(u32), 2, fp);
3365         if (rc)
3366                 return rc;
3367         rc = put_entry(POLICYDB_STRING, 1, len, fp);
3368         if (rc)
3369                 return rc;
3370
3371         /* Write the version, config, and table sizes. */
3372         info = policydb_lookup_compat(p->policyvers);
3373         if (!info) {
3374                 printk(KERN_ERR "SELinux: compatibility lookup failed for policy "
3375                     "version %d", p->policyvers);
3376                 return -EINVAL;
3377         }
3378
3379         buf[0] = cpu_to_le32(p->policyvers);
3380         buf[1] = cpu_to_le32(config);
3381         buf[2] = cpu_to_le32(info->sym_num);
3382         buf[3] = cpu_to_le32(info->ocon_num);
3383
3384         rc = put_entry(buf, sizeof(u32), 4, fp);
3385         if (rc)
3386                 return rc;
3387
3388         if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
3389                 rc = ebitmap_write(&p->policycaps, fp);
3390                 if (rc)
3391                         return rc;
3392         }
3393
3394         if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
3395                 rc = ebitmap_write(&p->permissive_map, fp);
3396                 if (rc)
3397                         return rc;
3398         }
3399
3400         num_syms = info->sym_num;
3401         for (i = 0; i < num_syms; i++) {
3402                 struct policy_data pd;
3403
3404                 pd.fp = fp;
3405                 pd.p = p;
3406
3407                 buf[0] = cpu_to_le32(p->symtab[i].nprim);
3408                 buf[1] = cpu_to_le32(p->symtab[i].table->nel);
3409
3410                 rc = put_entry(buf, sizeof(u32), 2, fp);
3411                 if (rc)
3412                         return rc;
3413                 rc = hashtab_map(p->symtab[i].table, write_f[i], &pd);
3414                 if (rc)
3415                         return rc;
3416         }
3417
3418         rc = avtab_write(p, &p->te_avtab, fp);
3419         if (rc)
3420                 return rc;
3421
3422         rc = cond_write_list(p, p->cond_list, fp);
3423         if (rc)
3424                 return rc;
3425
3426         rc = role_trans_write(p, fp);
3427         if (rc)
3428                 return rc;
3429
3430         rc = role_allow_write(p->role_allow, fp);
3431         if (rc)
3432                 return rc;
3433
3434         rc = filename_trans_write(p, fp);
3435         if (rc)
3436                 return rc;
3437
3438         rc = ocontext_write(p, info, fp);
3439         if (rc)
3440                 return rc;
3441
3442         rc = genfs_write(p, fp);
3443         if (rc)
3444                 return rc;
3445
3446         rc = range_write(p, fp);
3447         if (rc)
3448                 return rc;
3449
3450         for (i = 0; i < p->p_types.nprim; i++) {
3451                 struct ebitmap *e = flex_array_get(p->type_attr_map_array, i);
3452
3453                 BUG_ON(!e);
3454                 rc = ebitmap_write(e, fp);
3455                 if (rc)
3456                         return rc;
3457         }
3458
3459         return 0;
3460 }