security/selinux/ss/policydb.c

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