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  * Update: Mellanox Techonologies
  21  *
  22  *      Added Infiniband support
  23  *
  24  * Copyright (C) 2016 Mellanox Techonologies
  25  * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
  26  * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
  27  * Copyright (C) 2003 - 2004 Tresys Technology, LLC
  28  *      This program is free software; you can redistribute it and/or modify
  29  *      it under the terms of the GNU General Public License as published by
  30  *      the Free Software Foundation, version 2.
  31  */
  32
  33 #include <linux/kernel.h>
  34 #include <linux/sched.h>
  35 #include <linux/slab.h>
  36 #include <linux/string.h>
  37 #include <linux/errno.h>
  38 #include <linux/audit.h>
  39 #include <linux/flex_array.h>
  40 #include "security.h"
  41
  42 #include "policydb.h"
  43 #include "conditional.h"
  44 #include "mls.h"
  45 #include "services.h"
  46
  47 #define _DEBUG_HASHES
  48
  49 #ifdef DEBUG_HASHES
  50 static const char *symtab_name[SYM_NUM] = {
  51         "common prefixes",
  52         "classes",
  53         "roles",
  54         "types",
  55         "users",
  56         "bools",
  57         "levels",
  58         "categories",
  59 };
  60 #endif
  61
  62 static unsigned int symtab_sizes[SYM_NUM] = {
  63         2,
  64         32,
  65         16,
  66         512,
  67         128,
  68         16,
  69         16,
  70         16,
  71 };
  72
  73 struct policydb_compat_info {
  74         int version;
  75         int sym_num;
  76         int ocon_num;
  77 };
  78
  79 /* These need to be updated if SYM_NUM or OCON_NUM changes */
  80 static struct policydb_compat_info policydb_compat[] = {
  81         {
  82                 .version        = POLICYDB_VERSION_BASE,
  83                 .sym_num        = SYM_NUM - 3,
  84                 .ocon_num       = OCON_NUM - 3,
  85         },
  86         {
  87                 .version        = POLICYDB_VERSION_BOOL,
  88                 .sym_num        = SYM_NUM - 2,
  89                 .ocon_num       = OCON_NUM - 3,
  90         },
  91         {
  92                 .version        = POLICYDB_VERSION_IPV6,
  93                 .sym_num        = SYM_NUM - 2,
  94                 .ocon_num       = OCON_NUM - 2,
  95         },
  96         {
  97                 .version        = POLICYDB_VERSION_NLCLASS,
  98                 .sym_num        = SYM_NUM - 2,
  99                 .ocon_num       = OCON_NUM - 2,
 100         },
 101         {
 102                 .version        = POLICYDB_VERSION_MLS,
 103                 .sym_num        = SYM_NUM,
 104                 .ocon_num       = OCON_NUM - 2,
 105         },
 106         {
 107                 .version        = POLICYDB_VERSION_AVTAB,
 108                 .sym_num        = SYM_NUM,
 109                 .ocon_num       = OCON_NUM - 2,
 110         },
 111         {
 112                 .version        = POLICYDB_VERSION_RANGETRANS,
 113                 .sym_num        = SYM_NUM,
 114                 .ocon_num       = OCON_NUM - 2,
 115         },
 116         {
 117                 .version        = POLICYDB_VERSION_POLCAP,
 118                 .sym_num        = SYM_NUM,
 119                 .ocon_num       = OCON_NUM - 2,
 120         },
 121         {
 122                 .version        = POLICYDB_VERSION_PERMISSIVE,
 123                 .sym_num        = SYM_NUM,
 124                 .ocon_num       = OCON_NUM - 2,
 125         },
 126         {
 127                 .version        = POLICYDB_VERSION_BOUNDARY,
 128                 .sym_num        = SYM_NUM,
 129                 .ocon_num       = OCON_NUM - 2,
 130         },
 131         {
 132                 .version        = POLICYDB_VERSION_FILENAME_TRANS,
 133                 .sym_num        = SYM_NUM,
 134                 .ocon_num       = OCON_NUM - 2,
 135         },
 136         {
 137                 .version        = POLICYDB_VERSION_ROLETRANS,
 138                 .sym_num        = SYM_NUM,
 139                 .ocon_num       = OCON_NUM - 2,
 140         },
 141         {
 142                 .version        = POLICYDB_VERSION_NEW_OBJECT_DEFAULTS,
 143                 .sym_num        = SYM_NUM,
 144                 .ocon_num       = OCON_NUM - 2,
 145         },
 146         {
 147                 .version        = POLICYDB_VERSION_DEFAULT_TYPE,
 148                 .sym_num        = SYM_NUM,
 149                 .ocon_num       = OCON_NUM - 2,
 150         },
 151         {
 152                 .version        = POLICYDB_VERSION_CONSTRAINT_NAMES,
 153                 .sym_num        = SYM_NUM,
 154                 .ocon_num       = OCON_NUM - 2,
 155         },
 156         {
 157                 .version        = POLICYDB_VERSION_XPERMS_IOCTL,
 158                 .sym_num        = SYM_NUM,
 159                 .ocon_num       = OCON_NUM - 2,
 160         },
 161         {
 162                 .version        = POLICYDB_VERSION_INFINIBAND,
 163                 .sym_num        = SYM_NUM,
 164                 .ocon_num       = OCON_NUM,
 165         },
 166 };
 167
 168 static struct policydb_compat_info *policydb_lookup_compat(int version)
 169 {
 170         int i;
 171         struct policydb_compat_info *info = NULL;
 172
 173         for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) {
 174                 if (policydb_compat[i].version == version) {
 175                         info = &policydb_compat[i];
 176                         break;
 177                 }
 178         }
 179         return info;
 180 }
 181
 182 /*
 183  * Initialize the role table.
 184  */
 185 static int roles_init(struct policydb *p)
 186 {
 187         char *key = NULL;
 188         int rc;
 189         struct role_datum *role;
 190
 191         role = kzalloc(sizeof(*role), GFP_KERNEL);
 192         if (!role)
 193                 return -ENOMEM;
 194
 195         rc = -EINVAL;
 196         role->value = ++p->p_roles.nprim;
 197         if (role->value != OBJECT_R_VAL)
 198                 goto out;
 199
 200         rc = -ENOMEM;
 201         key = kstrdup(OBJECT_R, GFP_KERNEL);
 202         if (!key)
 203                 goto out;
 204
 205         rc = hashtab_insert(p->p_roles.table, key, role);
 206         if (rc)
 207                 goto out;
 208
 209         return 0;
 210 out:
 211         kfree(key);
 212         kfree(role);
 213         return rc;
 214 }
 215
 216 static u32 filenametr_hash(struct hashtab *h, const void *k)
 217 {
 218         const struct filename_trans *ft = k;
 219         unsigned long hash;
 220         unsigned int byte_num;
 221         unsigned char focus;
 222
 223         hash = ft->stype ^ ft->ttype ^ ft->tclass;
 224
 225         byte_num = 0;
 226         while ((focus = ft->name[byte_num++]))
 227                 hash = partial_name_hash(focus, hash);
 228         return hash & (h->size - 1);
 229 }
 230
 231 static int filenametr_cmp(struct hashtab *h, const void *k1, const void *k2)
 232 {
 233         const struct filename_trans *ft1 = k1;
 234         const struct filename_trans *ft2 = k2;
 235         int v;
 236
 237         v = ft1->stype - ft2->stype;
 238         if (v)
 239                 return v;
 240
 241         v = ft1->ttype - ft2->ttype;
 242         if (v)
 243                 return v;
 244
 245         v = ft1->tclass - ft2->tclass;
 246         if (v)
 247                 return v;
 248
 249         return strcmp(ft1->name, ft2->name);
 250
 251 }
 252
 253 static u32 rangetr_hash(struct hashtab *h, const void *k)
 254 {
 255         const struct range_trans *key = k;
 256         return (key->source_type + (key->target_type << 3) +
 257                 (key->target_class << 5)) & (h->size - 1);
 258 }
 259
 260 static int rangetr_cmp(struct hashtab *h, const void *k1, const void *k2)
 261 {
 262         const struct range_trans *key1 = k1, *key2 = k2;
 263         int v;
 264
 265         v = key1->source_type - key2->source_type;
 266         if (v)
 267                 return v;
 268
 269         v = key1->target_type - key2->target_type;
 270         if (v)
 271                 return v;
 272
 273         v = key1->target_class - key2->target_class;
 274
 275         return v;
 276 }
 277
 278 /*
 279  * Initialize a policy database structure.
 280  */
 281 static int policydb_init(struct policydb *p)
 282 {
 283         int i, rc;
 284
 285         memset(p, 0, sizeof(*p));
 286
 287         for (i = 0; i < SYM_NUM; i++) {
 288                 rc = symtab_init(&p->symtab[i], symtab_sizes[i]);
 289                 if (rc)
 290                         goto out;
 291         }
 292
 293         rc = avtab_init(&p->te_avtab);
 294         if (rc)
 295                 goto out;
 296
 297         rc = roles_init(p);
 298         if (rc)
 299                 goto out;
 300
 301         rc = cond_policydb_init(p);
 302         if (rc)
 303                 goto out;
 304
 305         p->filename_trans = hashtab_create(filenametr_hash, filenametr_cmp, (1 << 10));
 306         if (!p->filename_trans) {
 307                 rc = -ENOMEM;
 308                 goto out;
 309         }
 310
 311         p->range_tr = hashtab_create(rangetr_hash, rangetr_cmp, 256);
 312         if (!p->range_tr) {
 313                 rc = -ENOMEM;
 314                 goto out;
 315         }
 316
 317         ebitmap_init(&p->filename_trans_ttypes);
 318         ebitmap_init(&p->policycaps);
 319         ebitmap_init(&p->permissive_map);
 320
 321         return 0;
 322 out:
 323         hashtab_destroy(p->filename_trans);
 324         hashtab_destroy(p->range_tr);
 325         for (i = 0; i < SYM_NUM; i++)
 326                 hashtab_destroy(p->symtab[i].table);
 327         return rc;
 328 }
 329
 330 /*
 331  * The following *_index functions are used to
 332  * define the val_to_name and val_to_struct arrays
 333  * in a policy database structure.  The val_to_name
 334  * arrays are used when converting security context
 335  * structures into string representations.  The
 336  * val_to_struct arrays are used when the attributes
 337  * of a class, role, or user are needed.
 338  */
 339
 340 static int common_index(void *key, void *datum, void *datap)
 341 {
 342         struct policydb *p;
 343         struct common_datum *comdatum;
 344         struct flex_array *fa;
 345
 346         comdatum = datum;
 347         p = datap;
 348         if (!comdatum->value || comdatum->value > p->p_commons.nprim)
 349                 return -EINVAL;
 350
 351         fa = p->sym_val_to_name[SYM_COMMONS];
 352         if (flex_array_put_ptr(fa, comdatum->value - 1, key,
 353                                GFP_KERNEL | __GFP_ZERO))
 354                 BUG();
 355         return 0;
 356 }
 357
 358 static int class_index(void *key, void *datum, void *datap)
 359 {
 360         struct policydb *p;
 361         struct class_datum *cladatum;
 362         struct flex_array *fa;
 363
 364         cladatum = datum;
 365         p = datap;
 366         if (!cladatum->value || cladatum->value > p->p_classes.nprim)
 367                 return -EINVAL;
 368         fa = p->sym_val_to_name[SYM_CLASSES];
 369         if (flex_array_put_ptr(fa, cladatum->value - 1, key,
 370                                GFP_KERNEL | __GFP_ZERO))
 371                 BUG();
 372         p->class_val_to_struct[cladatum->value - 1] = cladatum;
 373         return 0;
 374 }
 375
 376 static int role_index(void *key, void *datum, void *datap)
 377 {
 378         struct policydb *p;
 379         struct role_datum *role;
 380         struct flex_array *fa;
 381
 382         role = datum;
 383         p = datap;
 384         if (!role->value
 385             || role->value > p->p_roles.nprim
 386             || role->bounds > p->p_roles.nprim)
 387                 return -EINVAL;
 388
 389         fa = p->sym_val_to_name[SYM_ROLES];
 390         if (flex_array_put_ptr(fa, role->value - 1, key,
 391                                GFP_KERNEL | __GFP_ZERO))
 392                 BUG();
 393         p->role_val_to_struct[role->value - 1] = role;
 394         return 0;
 395 }
 396
 397 static int type_index(void *key, void *datum, void *datap)
 398 {
 399         struct policydb *p;
 400         struct type_datum *typdatum;
 401         struct flex_array *fa;
 402
 403         typdatum = datum;
 404         p = datap;
 405
 406         if (typdatum->primary) {
 407                 if (!typdatum->value
 408                     || typdatum->value > p->p_types.nprim
 409                     || typdatum->bounds > p->p_types.nprim)
 410                         return -EINVAL;
 411                 fa = p->sym_val_to_name[SYM_TYPES];
 412                 if (flex_array_put_ptr(fa, typdatum->value - 1, key,
 413                                        GFP_KERNEL | __GFP_ZERO))
 414                         BUG();
 415
 416                 fa = p->type_val_to_struct_array;
 417                 if (flex_array_put_ptr(fa, typdatum->value - 1, typdatum,
 418                                        GFP_KERNEL | __GFP_ZERO))
 419                         BUG();
 420         }
 421
 422         return 0;
 423 }
 424
 425 static int user_index(void *key, void *datum, void *datap)
 426 {
 427         struct policydb *p;
 428         struct user_datum *usrdatum;
 429         struct flex_array *fa;
 430
 431         usrdatum = datum;
 432         p = datap;
 433         if (!usrdatum->value
 434             || usrdatum->value > p->p_users.nprim
 435             || usrdatum->bounds > p->p_users.nprim)
 436                 return -EINVAL;
 437
 438         fa = p->sym_val_to_name[SYM_USERS];
 439         if (flex_array_put_ptr(fa, usrdatum->value - 1, key,
 440                                GFP_KERNEL | __GFP_ZERO))
 441                 BUG();
 442         p->user_val_to_struct[usrdatum->value - 1] = usrdatum;
 443         return 0;
 444 }
 445
 446 static int sens_index(void *key, void *datum, void *datap)
 447 {
 448         struct policydb *p;
 449         struct level_datum *levdatum;
 450         struct flex_array *fa;
 451
 452         levdatum = datum;
 453         p = datap;
 454
 455         if (!levdatum->isalias) {
 456                 if (!levdatum->level->sens ||
 457                     levdatum->level->sens > p->p_levels.nprim)
 458                         return -EINVAL;
 459                 fa = p->sym_val_to_name[SYM_LEVELS];
 460                 if (flex_array_put_ptr(fa, levdatum->level->sens - 1, key,
 461                                        GFP_KERNEL | __GFP_ZERO))
 462                         BUG();
 463         }
 464
 465         return 0;
 466 }
 467
 468 static int cat_index(void *key, void *datum, void *datap)
 469 {
 470         struct policydb *p;
 471         struct cat_datum *catdatum;
 472         struct flex_array *fa;
 473
 474         catdatum = datum;
 475         p = datap;
 476
 477         if (!catdatum->isalias) {
 478                 if (!catdatum->value || catdatum->value > p->p_cats.nprim)
 479                         return -EINVAL;
 480                 fa = p->sym_val_to_name[SYM_CATS];
 481                 if (flex_array_put_ptr(fa, catdatum->value - 1, key,
 482                                        GFP_KERNEL | __GFP_ZERO))
 483                         BUG();
 484         }
 485
 486         return 0;
 487 }
 488
 489 static int (*index_f[SYM_NUM]) (void *key, void *datum, void *datap) =
 490 {
 491         common_index,
 492         class_index,
 493         role_index,
 494         type_index,
 495         user_index,
 496         cond_index_bool,
 497         sens_index,
 498         cat_index,
 499 };
 500
 501 #ifdef DEBUG_HASHES
 502 static void hash_eval(struct hashtab *h, const char *hash_name)
 503 {
 504         struct hashtab_info info;
 505
 506         hashtab_stat(h, &info);
 507         pr_debug("SELinux: %s:  %d entries and %d/%d buckets used, "
 508                "longest chain length %d\n", hash_name, h->nel,
 509                info.slots_used, h->size, info.max_chain_len);
 510 }
 511
 512 static void symtab_hash_eval(struct symtab *s)
 513 {
 514         int i;
 515
 516         for (i = 0; i < SYM_NUM; i++)
 517                 hash_eval(s[i].table, symtab_name[i]);
 518 }
 519
 520 #else
 521 static inline void hash_eval(struct hashtab *h, char *hash_name)
 522 {
 523 }
 524 #endif
 525
 526 /*
 527  * Define the other val_to_name and val_to_struct arrays
 528  * in a policy database structure.
 529  *
 530  * Caller must clean up on failure.
 531  */
 532 static int policydb_index(struct policydb *p)
 533 {
 534         int i, rc;
 535
 536         if (p->mls_enabled)
 537                 pr_debug("SELinux:  %d users, %d roles, %d types, %d bools, %d sens, %d cats\n",
 538                          p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim,
 539                          p->p_bools.nprim, p->p_levels.nprim, p->p_cats.nprim);
 540         else
 541                 pr_debug("SELinux:  %d users, %d roles, %d types, %d bools\n",
 542                          p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim,
 543                          p->p_bools.nprim);
 544
 545         pr_debug("SELinux:  %d classes, %d rules\n",
 546                  p->p_classes.nprim, p->te_avtab.nel);
 547
 548 #ifdef DEBUG_HASHES
 549         avtab_hash_eval(&p->te_avtab, "rules");
 550         symtab_hash_eval(p->symtab);
 551 #endif
 552
 553         p->class_val_to_struct = kcalloc(p->p_classes.nprim,
 554                                          sizeof(*p->class_val_to_struct),
 555                                          GFP_KERNEL);
 556         if (!p->class_val_to_struct)
 557                 return -ENOMEM;
 558
 559         p->role_val_to_struct = kcalloc(p->p_roles.nprim,
 560                                         sizeof(*p->role_val_to_struct),
 561                                         GFP_KERNEL);
 562         if (!p->role_val_to_struct)
 563                 return -ENOMEM;
 564
 565         p->user_val_to_struct = kcalloc(p->p_users.nprim,
 566                                         sizeof(*p->user_val_to_struct),
 567                                         GFP_KERNEL);
 568         if (!p->user_val_to_struct)
 569                 return -ENOMEM;
 570
 571         /* Yes, I want the sizeof the pointer, not the structure */
 572         p->type_val_to_struct_array = flex_array_alloc(sizeof(struct type_datum *),
 573                                                        p->p_types.nprim,
 574                                                        GFP_KERNEL | __GFP_ZERO);
 575         if (!p->type_val_to_struct_array)
 576                 return -ENOMEM;
 577
 578         rc = flex_array_prealloc(p->type_val_to_struct_array, 0,
 579                                  p->p_types.nprim, GFP_KERNEL | __GFP_ZERO);
 580         if (rc)
 581                 goto out;
 582
 583         rc = cond_init_bool_indexes(p);
 584         if (rc)
 585                 goto out;
 586
 587         for (i = 0; i < SYM_NUM; i++) {
 588                 p->sym_val_to_name[i] = flex_array_alloc(sizeof(char *),
 589                                                          p->symtab[i].nprim,
 590                                                          GFP_KERNEL | __GFP_ZERO);
 591                 if (!p->sym_val_to_name[i])
 592                         return -ENOMEM;
 593
 594                 rc = flex_array_prealloc(p->sym_val_to_name[i],
 595                                          0, p->symtab[i].nprim,
 596                                          GFP_KERNEL | __GFP_ZERO);
 597                 if (rc)
 598                         goto out;
 599
 600                 rc = hashtab_map(p->symtab[i].table, index_f[i], p);
 601                 if (rc)
 602                         goto out;
 603         }
 604         rc = 0;
 605 out:
 606         return rc;
 607 }
 608
 609 /*
 610  * The following *_destroy functions are used to
 611  * free any memory allocated for each kind of
 612  * symbol data in the policy database.
 613  */
 614
 615 static int perm_destroy(void *key, void *datum, void *p)
 616 {
 617         kfree(key);
 618         kfree(datum);
 619         return 0;
 620 }
 621
 622 static int common_destroy(void *key, void *datum, void *p)
 623 {
 624         struct common_datum *comdatum;
 625
 626         kfree(key);
 627         if (datum) {
 628                 comdatum = datum;
 629                 hashtab_map(comdatum->permissions.table, perm_destroy, NULL);
 630                 hashtab_destroy(comdatum->permissions.table);
 631         }
 632         kfree(datum);
 633         return 0;
 634 }
 635
 636 static void constraint_expr_destroy(struct constraint_expr *expr)
 637 {
 638         if (expr) {
 639                 ebitmap_destroy(&expr->names);
 640                 if (expr->type_names) {
 641                         ebitmap_destroy(&expr->type_names->types);
 642                         ebitmap_destroy(&expr->type_names->negset);
 643                         kfree(expr->type_names);
 644                 }
 645                 kfree(expr);
 646         }
 647 }
 648
 649 static int cls_destroy(void *key, void *datum, void *p)
 650 {
 651         struct class_datum *cladatum;
 652         struct constraint_node *constraint, *ctemp;
 653         struct constraint_expr *e, *etmp;
 654
 655         kfree(key);
 656         if (datum) {
 657                 cladatum = datum;
 658                 hashtab_map(cladatum->permissions.table, perm_destroy, NULL);
 659                 hashtab_destroy(cladatum->permissions.table);
 660                 constraint = cladatum->constraints;
 661                 while (constraint) {
 662                         e = constraint->expr;
 663                         while (e) {
 664                                 etmp = e;
 665                                 e = e->next;
 666                                 constraint_expr_destroy(etmp);
 667                         }
 668                         ctemp = constraint;
 669                         constraint = constraint->next;
 670                         kfree(ctemp);
 671                 }
 672
 673                 constraint = cladatum->validatetrans;
 674                 while (constraint) {
 675                         e = constraint->expr;
 676                         while (e) {
 677                                 etmp = e;
 678                                 e = e->next;
 679                                 constraint_expr_destroy(etmp);
 680                         }
 681                         ctemp = constraint;
 682                         constraint = constraint->next;
 683                         kfree(ctemp);
 684                 }
 685                 kfree(cladatum->comkey);
 686         }
 687         kfree(datum);
 688         return 0;
 689 }
 690
 691 static int role_destroy(void *key, void *datum, void *p)
 692 {
 693         struct role_datum *role;
 694
 695         kfree(key);
 696         if (datum) {
 697                 role = datum;
 698                 ebitmap_destroy(&role->dominates);
 699                 ebitmap_destroy(&role->types);
 700         }
 701         kfree(datum);
 702         return 0;
 703 }
 704
 705 static int type_destroy(void *key, void *datum, void *p)
 706 {
 707         kfree(key);
 708         kfree(datum);
 709         return 0;
 710 }
 711
 712 static int user_destroy(void *key, void *datum, void *p)
 713 {
 714         struct user_datum *usrdatum;
 715
 716         kfree(key);
 717         if (datum) {
 718                 usrdatum = datum;
 719                 ebitmap_destroy(&usrdatum->roles);
 720                 ebitmap_destroy(&usrdatum->range.level[0].cat);
 721                 ebitmap_destroy(&usrdatum->range.level[1].cat);
 722                 ebitmap_destroy(&usrdatum->dfltlevel.cat);
 723         }
 724         kfree(datum);
 725         return 0;
 726 }
 727
 728 static int sens_destroy(void *key, void *datum, void *p)
 729 {
 730         struct level_datum *levdatum;
 731
 732         kfree(key);
 733         if (datum) {
 734                 levdatum = datum;
 735                 ebitmap_destroy(&levdatum->level->cat);
 736                 kfree(levdatum->level);
 737         }
 738         kfree(datum);
 739         return 0;
 740 }
 741
 742 static int cat_destroy(void *key, void *datum, void *p)
 743 {
 744         kfree(key);
 745         kfree(datum);
 746         return 0;
 747 }
 748
 749 static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) =
 750 {
 751         common_destroy,
 752         cls_destroy,
 753         role_destroy,
 754         type_destroy,
 755         user_destroy,
 756         cond_destroy_bool,
 757         sens_destroy,
 758         cat_destroy,
 759 };
 760
 761 static int filenametr_destroy(void *key, void *datum, void *p)
 762 {
 763         struct filename_trans *ft = key;
 764         kfree(ft->name);
 765         kfree(key);
 766         kfree(datum);
 767         cond_resched();
 768         return 0;
 769 }
 770
 771 static int range_tr_destroy(void *key, void *datum, void *p)
 772 {
 773         struct mls_range *rt = datum;
 774         kfree(key);
 775         ebitmap_destroy(&rt->level[0].cat);
 776         ebitmap_destroy(&rt->level[1].cat);
 777         kfree(datum);
 778         cond_resched();
 779         return 0;
 780 }
 781
 782 static void ocontext_destroy(struct ocontext *c, int i)
 783 {
 784         if (!c)
 785                 return;
 786
 787         context_destroy(&c->context[0]);
 788         context_destroy(&c->context[1]);
 789         if (i == OCON_ISID || i == OCON_FS ||
 790             i == OCON_NETIF || i == OCON_FSUSE)
 791                 kfree(c->u.name);
 792         kfree(c);
 793 }
 794
 795 /*
 796  * Free any memory allocated by a policy database structure.
 797  */
 798 void policydb_destroy(struct policydb *p)
 799 {
 800         struct ocontext *c, *ctmp;
 801         struct genfs *g, *gtmp;
 802         int i;
 803         struct role_allow *ra, *lra = NULL;
 804         struct role_trans *tr, *ltr = NULL;
 805
 806         for (i = 0; i < SYM_NUM; i++) {
 807                 cond_resched();
 808                 hashtab_map(p->symtab[i].table, destroy_f[i], NULL);
 809                 hashtab_destroy(p->symtab[i].table);
 810         }
 811
 812         for (i = 0; i < SYM_NUM; i++) {
 813                 if (p->sym_val_to_name[i])
 814                         flex_array_free(p->sym_val_to_name[i]);
 815         }
 816
 817         kfree(p->class_val_to_struct);
 818         kfree(p->role_val_to_struct);
 819         kfree(p->user_val_to_struct);
 820         if (p->type_val_to_struct_array)
 821                 flex_array_free(p->type_val_to_struct_array);
 822
 823         avtab_destroy(&p->te_avtab);
 824
 825         for (i = 0; i < OCON_NUM; i++) {
 826                 cond_resched();
 827                 c = p->ocontexts[i];
 828                 while (c) {
 829                         ctmp = c;
 830                         c = c->next;
 831                         ocontext_destroy(ctmp, i);
 832                 }
 833                 p->ocontexts[i] = NULL;
 834         }
 835
 836         g = p->genfs;
 837         while (g) {
 838                 cond_resched();
 839                 kfree(g->fstype);
 840                 c = g->head;
 841                 while (c) {
 842                         ctmp = c;
 843                         c = c->next;
 844                         ocontext_destroy(ctmp, OCON_FSUSE);
 845                 }
 846                 gtmp = g;
 847                 g = g->next;
 848                 kfree(gtmp);
 849         }
 850         p->genfs = NULL;
 851
 852         cond_policydb_destroy(p);
 853
 854         for (tr = p->role_tr; tr; tr = tr->next) {
 855                 cond_resched();
 856                 kfree(ltr);
 857                 ltr = tr;
 858         }
 859         kfree(ltr);
 860
 861         for (ra = p->role_allow; ra; ra = ra->next) {
 862                 cond_resched();
 863                 kfree(lra);
 864                 lra = ra;
 865         }
 866         kfree(lra);
 867
 868         hashtab_map(p->filename_trans, filenametr_destroy, NULL);
 869         hashtab_destroy(p->filename_trans);
 870
 871         hashtab_map(p->range_tr, range_tr_destroy, NULL);
 872         hashtab_destroy(p->range_tr);
 873
 874         if (p->type_attr_map_array) {
 875                 for (i = 0; i < p->p_types.nprim; i++) {
 876                         struct ebitmap *e;
 877
 878                         e = flex_array_get(p->type_attr_map_array, i);
 879                         if (!e)
 880                                 continue;
 881                         ebitmap_destroy(e);
 882                 }
 883                 flex_array_free(p->type_attr_map_array);
 884         }
 885
 886         ebitmap_destroy(&p->filename_trans_ttypes);
 887         ebitmap_destroy(&p->policycaps);
 888         ebitmap_destroy(&p->permissive_map);
 889 }
 890
 891 /*
 892  * Load the initial SIDs specified in a policy database
 893  * structure into a SID table.
 894  */
 895 int policydb_load_isids(struct policydb *p, struct sidtab *s)
 896 {
 897         struct ocontext *head, *c;
 898         int rc;
 899
 900         rc = sidtab_init(s);
 901         if (rc) {
 902                 pr_err("SELinux:  out of memory on SID table init\n");
 903                 goto out;
 904         }
 905
 906         head = p->ocontexts[OCON_ISID];
 907         for (c = head; c; c = c->next) {
 908                 rc = -EINVAL;
 909                 if (!c->context[0].user) {
 910                         pr_err("SELinux:  SID %s was never defined.\n",
 911                                 c->u.name);
 912                         goto out;
 913                 }
 914
 915                 rc = sidtab_insert(s, c->sid[0], &c->context[0]);
 916                 if (rc) {
 917                         pr_err("SELinux:  unable to load initial SID %s.\n",
 918                                 c->u.name);
 919                         goto out;
 920                 }
 921         }
 922         rc = 0;
 923 out:
 924         return rc;
 925 }
 926
 927 int policydb_class_isvalid(struct policydb *p, unsigned int class)
 928 {
 929         if (!class || class > p->p_classes.nprim)
 930                 return 0;
 931         return 1;
 932 }
 933
 934 int policydb_role_isvalid(struct policydb *p, unsigned int role)
 935 {
 936         if (!role || role > p->p_roles.nprim)
 937                 return 0;
 938         return 1;
 939 }
 940
 941 int policydb_type_isvalid(struct policydb *p, unsigned int type)
 942 {
 943         if (!type || type > p->p_types.nprim)
 944                 return 0;
 945         return 1;
 946 }
 947
 948 /*
 949  * Return 1 if the fields in the security context
 950  * structure `c' are valid.  Return 0 otherwise.
 951  */
 952 int policydb_context_isvalid(struct policydb *p, struct context *c)
 953 {
 954         struct role_datum *role;
 955         struct user_datum *usrdatum;
 956
 957         if (!c->role || c->role > p->p_roles.nprim)
 958                 return 0;
 959
 960         if (!c->user || c->user > p->p_users.nprim)
 961                 return 0;
 962
 963         if (!c->type || c->type > p->p_types.nprim)
 964                 return 0;
 965
 966         if (c->role != OBJECT_R_VAL) {
 967                 /*
 968                  * Role must be authorized for the type.
 969                  */
 970                 role = p->role_val_to_struct[c->role - 1];
 971                 if (!role || !ebitmap_get_bit(&role->types, c->type - 1))
 972                         /* role may not be associated with type */
 973                         return 0;
 974
 975                 /*
 976                  * User must be authorized for the role.
 977                  */
 978                 usrdatum = p->user_val_to_struct[c->user - 1];
 979                 if (!usrdatum)
 980                         return 0;
 981
 982                 if (!ebitmap_get_bit(&usrdatum->roles, c->role - 1))
 983                         /* user may not be associated with role */
 984                         return 0;
 985         }
 986
 987         if (!mls_context_isvalid(p, c))
 988                 return 0;
 989
 990         return 1;
 991 }
 992
 993 /*
 994  * Read a MLS range structure from a policydb binary
 995  * representation file.
 996  */
 997 static int mls_read_range_helper(struct mls_range *r, void *fp)
 998 {
 999         __le32 buf[2];
1000         u32 items;
1001         int rc;
1002
1003         rc = next_entry(buf, fp, sizeof(u32));
1004         if (rc)
1005                 goto out;
1006
1007         rc = -EINVAL;
1008         items = le32_to_cpu(buf[0]);
1009         if (items > ARRAY_SIZE(buf)) {
1010                 pr_err("SELinux: mls:  range overflow\n");
1011                 goto out;
1012         }
1013
1014         rc = next_entry(buf, fp, sizeof(u32) * items);
1015         if (rc) {
1016                 pr_err("SELinux: mls:  truncated range\n");
1017                 goto out;
1018         }
1019
1020         r->level[0].sens = le32_to_cpu(buf[0]);
1021         if (items > 1)
1022                 r->level[1].sens = le32_to_cpu(buf[1]);
1023         else
1024                 r->level[1].sens = r->level[0].sens;
1025
1026         rc = ebitmap_read(&r->level[0].cat, fp);
1027         if (rc) {
1028                 pr_err("SELinux: mls:  error reading low categories\n");
1029                 goto out;
1030         }
1031         if (items > 1) {
1032                 rc = ebitmap_read(&r->level[1].cat, fp);
1033                 if (rc) {
1034                         pr_err("SELinux: mls:  error reading high categories\n");
1035                         goto bad_high;
1036                 }
1037         } else {
1038                 rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat);
1039                 if (rc) {
1040                         pr_err("SELinux: mls:  out of memory\n");
1041                         goto bad_high;
1042                 }
1043         }
1044
1045         return 0;
1046 bad_high:
1047         ebitmap_destroy(&r->level[0].cat);
1048 out:
1049         return rc;
1050 }
1051
1052 /*
1053  * Read and validate a security context structure
1054  * from a policydb binary representation file.
1055  */
1056 static int context_read_and_validate(struct context *c,
1057                                      struct policydb *p,
1058                                      void *fp)
1059 {
1060         __le32 buf[3];
1061         int rc;
1062
1063         rc = next_entry(buf, fp, sizeof buf);
1064         if (rc) {
1065                 pr_err("SELinux: context truncated\n");
1066                 goto out;
1067         }
1068         c->user = le32_to_cpu(buf[0]);
1069         c->role = le32_to_cpu(buf[1]);
1070         c->type = le32_to_cpu(buf[2]);
1071         if (p->policyvers >= POLICYDB_VERSION_MLS) {
1072                 rc = mls_read_range_helper(&c->range, fp);
1073                 if (rc) {
1074                         pr_err("SELinux: error reading MLS range of context\n");
1075                         goto out;
1076                 }
1077         }
1078
1079         rc = -EINVAL;
1080         if (!policydb_context_isvalid(p, c)) {
1081                 pr_err("SELinux:  invalid security context\n");
1082                 context_destroy(c);
1083                 goto out;
1084         }
1085         rc = 0;
1086 out:
1087         return rc;
1088 }
1089
1090 /*
1091  * The following *_read functions are used to
1092  * read the symbol data from a policy database
1093  * binary representation file.
1094  */
1095
1096 static int str_read(char **strp, gfp_t flags, void *fp, u32 len)
1097 {
1098         int rc;
1099         char *str;
1100
1101         if ((len == 0) || (len == (u32)-1))
1102                 return -EINVAL;
1103
1104         str = kmalloc(len + 1, flags | __GFP_NOWARN);
1105         if (!str)
1106                 return -ENOMEM;
1107
1108         /* it's expected the caller should free the str */
1109         *strp = str;
1110
1111         rc = next_entry(str, fp, len);
1112         if (rc)
1113                 return rc;
1114
1115         str[len] = '\0';
1116         return 0;
1117 }
1118
1119 static int perm_read(struct policydb *p, struct hashtab *h, void *fp)
1120 {
1121         char *key = NULL;
1122         struct perm_datum *perdatum;
1123         int rc;
1124         __le32 buf[2];
1125         u32 len;
1126
1127         perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
1128         if (!perdatum)
1129                 return -ENOMEM;
1130
1131         rc = next_entry(buf, fp, sizeof buf);
1132         if (rc)
1133                 goto bad;
1134
1135         len = le32_to_cpu(buf[0]);
1136         perdatum->value = le32_to_cpu(buf[1]);
1137
1138         rc = str_read(&key, GFP_KERNEL, fp, len);
1139         if (rc)
1140                 goto bad;
1141
1142         rc = hashtab_insert(h, key, perdatum);
1143         if (rc)
1144                 goto bad;
1145
1146         return 0;
1147 bad:
1148         perm_destroy(key, perdatum, NULL);
1149         return rc;
1150 }
1151
1152 static int common_read(struct policydb *p, struct hashtab *h, void *fp)
1153 {
1154         char *key = NULL;
1155         struct common_datum *comdatum;
1156         __le32 buf[4];
1157         u32 len, nel;
1158         int i, rc;
1159
1160         comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
1161         if (!comdatum)
1162                 return -ENOMEM;
1163
1164         rc = next_entry(buf, fp, sizeof buf);
1165         if (rc)
1166                 goto bad;
1167
1168         len = le32_to_cpu(buf[0]);
1169         comdatum->value = le32_to_cpu(buf[1]);
1170
1171         rc = symtab_init(&comdatum->permissions, PERM_SYMTAB_SIZE);
1172         if (rc)
1173                 goto bad;
1174         comdatum->permissions.nprim = le32_to_cpu(buf[2]);
1175         nel = le32_to_cpu(buf[3]);
1176
1177         rc = str_read(&key, GFP_KERNEL, fp, len);
1178         if (rc)
1179                 goto bad;
1180
1181         for (i = 0; i < nel; i++) {
1182                 rc = perm_read(p, comdatum->permissions.table, fp);
1183                 if (rc)
1184                         goto bad;
1185         }
1186
1187         rc = hashtab_insert(h, key, comdatum);
1188         if (rc)
1189                 goto bad;
1190         return 0;
1191 bad:
1192         common_destroy(key, comdatum, NULL);
1193         return rc;
1194 }
1195
1196 static void type_set_init(struct type_set *t)
1197 {
1198         ebitmap_init(&t->types);
1199         ebitmap_init(&t->negset);
1200 }
1201
1202 static int type_set_read(struct type_set *t, void *fp)
1203 {
1204         __le32 buf[1];
1205         int rc;
1206
1207         if (ebitmap_read(&t->types, fp))
1208                 return -EINVAL;
1209         if (ebitmap_read(&t->negset, fp))
1210                 return -EINVAL;
1211
1212         rc = next_entry(buf, fp, sizeof(u32));
1213         if (rc < 0)
1214                 return -EINVAL;
1215         t->flags = le32_to_cpu(buf[0]);
1216
1217         return 0;
1218 }
1219
1220
1221 static int read_cons_helper(struct policydb *p,
1222                                 struct constraint_node **nodep,
1223                                 int ncons, int allowxtarget, void *fp)
1224 {
1225         struct constraint_node *c, *lc;
1226         struct constraint_expr *e, *le;
1227         __le32 buf[3];
1228         u32 nexpr;
1229         int rc, i, j, depth;
1230
1231         lc = NULL;
1232         for (i = 0; i < ncons; i++) {
1233                 c = kzalloc(sizeof(*c), GFP_KERNEL);
1234                 if (!c)
1235                         return -ENOMEM;
1236
1237                 if (lc)
1238                         lc->next = c;
1239                 else
1240                         *nodep = c;
1241
1242                 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1243                 if (rc)
1244                         return rc;
1245                 c->permissions = le32_to_cpu(buf[0]);
1246                 nexpr = le32_to_cpu(buf[1]);
1247                 le = NULL;
1248                 depth = -1;
1249                 for (j = 0; j < nexpr; j++) {
1250                         e = kzalloc(sizeof(*e), GFP_KERNEL);
1251                         if (!e)
1252                                 return -ENOMEM;
1253
1254                         if (le)
1255                                 le->next = e;
1256                         else
1257                                 c->expr = e;
1258
1259                         rc = next_entry(buf, fp, (sizeof(u32) * 3));
1260                         if (rc)
1261                                 return rc;
1262                         e->expr_type = le32_to_cpu(buf[0]);
1263                         e->attr = le32_to_cpu(buf[1]);
1264                         e->op = le32_to_cpu(buf[2]);
1265
1266                         switch (e->expr_type) {
1267                         case CEXPR_NOT:
1268                                 if (depth < 0)
1269                                         return -EINVAL;
1270                                 break;
1271                         case CEXPR_AND:
1272                         case CEXPR_OR:
1273                                 if (depth < 1)
1274                                         return -EINVAL;
1275                                 depth--;
1276                                 break;
1277                         case CEXPR_ATTR:
1278                                 if (depth == (CEXPR_MAXDEPTH - 1))
1279                                         return -EINVAL;
1280                                 depth++;
1281                                 break;
1282                         case CEXPR_NAMES:
1283                                 if (!allowxtarget && (e->attr & CEXPR_XTARGET))
1284                                         return -EINVAL;
1285                                 if (depth == (CEXPR_MAXDEPTH - 1))
1286                                         return -EINVAL;
1287                                 depth++;
1288                                 rc = ebitmap_read(&e->names, fp);
1289                                 if (rc)
1290                                         return rc;
1291                                 if (p->policyvers >=
1292                                         POLICYDB_VERSION_CONSTRAINT_NAMES) {
1293                                                 e->type_names = kzalloc(sizeof
1294                                                 (*e->type_names),
1295                                                 GFP_KERNEL);
1296                                         if (!e->type_names)
1297                                                 return -ENOMEM;
1298                                         type_set_init(e->type_names);
1299                                         rc = type_set_read(e->type_names, fp);
1300                                         if (rc)
1301                                                 return rc;
1302                                 }
1303                                 break;
1304                         default:
1305                                 return -EINVAL;
1306                         }
1307                         le = e;
1308                 }
1309                 if (depth != 0)
1310                         return -EINVAL;
1311                 lc = c;
1312         }
1313
1314         return 0;
1315 }
1316
1317 static int class_read(struct policydb *p, struct hashtab *h, void *fp)
1318 {
1319         char *key = NULL;
1320         struct class_datum *cladatum;
1321         __le32 buf[6];
1322         u32 len, len2, ncons, nel;
1323         int i, rc;
1324
1325         cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
1326         if (!cladatum)
1327                 return -ENOMEM;
1328
1329         rc = next_entry(buf, fp, sizeof(u32)*6);
1330         if (rc)
1331                 goto bad;
1332
1333         len = le32_to_cpu(buf[0]);
1334         len2 = le32_to_cpu(buf[1]);
1335         cladatum->value = le32_to_cpu(buf[2]);
1336
1337         rc = symtab_init(&cladatum->permissions, PERM_SYMTAB_SIZE);
1338         if (rc)
1339                 goto bad;
1340         cladatum->permissions.nprim = le32_to_cpu(buf[3]);
1341         nel = le32_to_cpu(buf[4]);
1342
1343         ncons = le32_to_cpu(buf[5]);
1344
1345         rc = str_read(&key, GFP_KERNEL, fp, len);
1346         if (rc)
1347                 goto bad;
1348
1349         if (len2) {
1350                 rc = str_read(&cladatum->comkey, GFP_KERNEL, fp, len2);
1351                 if (rc)
1352                         goto bad;
1353
1354                 rc = -EINVAL;
1355                 cladatum->comdatum = hashtab_search(p->p_commons.table, cladatum->comkey);
1356                 if (!cladatum->comdatum) {
1357                         pr_err("SELinux:  unknown common %s\n",
1358                                cladatum->comkey);
1359                         goto bad;
1360                 }
1361         }
1362         for (i = 0; i < nel; i++) {
1363                 rc = perm_read(p, cladatum->permissions.table, fp);
1364                 if (rc)
1365                         goto bad;
1366         }
1367
1368         rc = read_cons_helper(p, &cladatum->constraints, ncons, 0, fp);
1369         if (rc)
1370                 goto bad;
1371
1372         if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
1373                 /* grab the validatetrans rules */
1374                 rc = next_entry(buf, fp, sizeof(u32));
1375                 if (rc)
1376                         goto bad;
1377                 ncons = le32_to_cpu(buf[0]);
1378                 rc = read_cons_helper(p, &cladatum->validatetrans,
1379                                 ncons, 1, fp);
1380                 if (rc)
1381                         goto bad;
1382         }
1383
1384         if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
1385                 rc = next_entry(buf, fp, sizeof(u32) * 3);
1386                 if (rc)
1387                         goto bad;
1388
1389                 cladatum->default_user = le32_to_cpu(buf[0]);
1390                 cladatum->default_role = le32_to_cpu(buf[1]);
1391                 cladatum->default_range = le32_to_cpu(buf[2]);
1392         }
1393
1394         if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
1395                 rc = next_entry(buf, fp, sizeof(u32) * 1);
1396                 if (rc)
1397                         goto bad;
1398                 cladatum->default_type = le32_to_cpu(buf[0]);
1399         }
1400
1401         rc = hashtab_insert(h, key, cladatum);
1402         if (rc)
1403                 goto bad;
1404
1405         return 0;
1406 bad:
1407         cls_destroy(key, cladatum, NULL);
1408         return rc;
1409 }
1410
1411 static int role_read(struct policydb *p, struct hashtab *h, void *fp)
1412 {
1413         char *key = NULL;
1414         struct role_datum *role;
1415         int rc, to_read = 2;
1416         __le32 buf[3];
1417         u32 len;
1418
1419         role = kzalloc(sizeof(*role), GFP_KERNEL);
1420         if (!role)
1421                 return -ENOMEM;
1422
1423         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1424                 to_read = 3;
1425
1426         rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1427         if (rc)
1428                 goto bad;
1429
1430         len = le32_to_cpu(buf[0]);
1431         role->value = le32_to_cpu(buf[1]);
1432         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1433                 role->bounds = le32_to_cpu(buf[2]);
1434
1435         rc = str_read(&key, GFP_KERNEL, fp, len);
1436         if (rc)
1437                 goto bad;
1438
1439         rc = ebitmap_read(&role->dominates, fp);
1440         if (rc)
1441                 goto bad;
1442
1443         rc = ebitmap_read(&role->types, fp);
1444         if (rc)
1445                 goto bad;
1446
1447         if (strcmp(key, OBJECT_R) == 0) {
1448                 rc = -EINVAL;
1449                 if (role->value != OBJECT_R_VAL) {
1450                         pr_err("SELinux: Role %s has wrong value %d\n",
1451                                OBJECT_R, role->value);
1452                         goto bad;
1453                 }
1454                 rc = 0;
1455                 goto bad;
1456         }
1457
1458         rc = hashtab_insert(h, key, role);
1459         if (rc)
1460                 goto bad;
1461         return 0;
1462 bad:
1463         role_destroy(key, role, NULL);
1464         return rc;
1465 }
1466
1467 static int type_read(struct policydb *p, struct hashtab *h, void *fp)
1468 {
1469         char *key = NULL;
1470         struct type_datum *typdatum;
1471         int rc, to_read = 3;
1472         __le32 buf[4];
1473         u32 len;
1474
1475         typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL);
1476         if (!typdatum)
1477                 return -ENOMEM;
1478
1479         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1480                 to_read = 4;
1481
1482         rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1483         if (rc)
1484                 goto bad;
1485
1486         len = le32_to_cpu(buf[0]);
1487         typdatum->value = le32_to_cpu(buf[1]);
1488         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
1489                 u32 prop = le32_to_cpu(buf[2]);
1490
1491                 if (prop & TYPEDATUM_PROPERTY_PRIMARY)
1492                         typdatum->primary = 1;
1493                 if (prop & TYPEDATUM_PROPERTY_ATTRIBUTE)
1494                         typdatum->attribute = 1;
1495
1496                 typdatum->bounds = le32_to_cpu(buf[3]);
1497         } else {
1498                 typdatum->primary = le32_to_cpu(buf[2]);
1499         }
1500
1501         rc = str_read(&key, GFP_KERNEL, fp, len);
1502         if (rc)
1503                 goto bad;
1504
1505         rc = hashtab_insert(h, key, typdatum);
1506         if (rc)
1507                 goto bad;
1508         return 0;
1509 bad:
1510         type_destroy(key, typdatum, NULL);
1511         return rc;
1512 }
1513
1514
1515 /*
1516  * Read a MLS level structure from a policydb binary
1517  * representation file.
1518  */
1519 static int mls_read_level(struct mls_level *lp, void *fp)
1520 {
1521         __le32 buf[1];
1522         int rc;
1523
1524         memset(lp, 0, sizeof(*lp));
1525
1526         rc = next_entry(buf, fp, sizeof buf);
1527         if (rc) {
1528                 pr_err("SELinux: mls: truncated level\n");
1529                 return rc;
1530         }
1531         lp->sens = le32_to_cpu(buf[0]);
1532
1533         rc = ebitmap_read(&lp->cat, fp);
1534         if (rc) {
1535                 pr_err("SELinux: mls:  error reading level categories\n");
1536                 return rc;
1537         }
1538         return 0;
1539 }
1540
1541 static int user_read(struct policydb *p, struct hashtab *h, void *fp)
1542 {
1543         char *key = NULL;
1544         struct user_datum *usrdatum;
1545         int rc, to_read = 2;
1546         __le32 buf[3];
1547         u32 len;
1548
1549         usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
1550         if (!usrdatum)
1551                 return -ENOMEM;
1552
1553         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1554                 to_read = 3;
1555
1556         rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1557         if (rc)
1558                 goto bad;
1559
1560         len = le32_to_cpu(buf[0]);
1561         usrdatum->value = le32_to_cpu(buf[1]);
1562         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
1563                 usrdatum->bounds = le32_to_cpu(buf[2]);
1564
1565         rc = str_read(&key, GFP_KERNEL, fp, len);
1566         if (rc)
1567                 goto bad;
1568
1569         rc = ebitmap_read(&usrdatum->roles, fp);
1570         if (rc)
1571                 goto bad;
1572
1573         if (p->policyvers >= POLICYDB_VERSION_MLS) {
1574                 rc = mls_read_range_helper(&usrdatum->range, fp);
1575                 if (rc)
1576                         goto bad;
1577                 rc = mls_read_level(&usrdatum->dfltlevel, fp);
1578                 if (rc)
1579                         goto bad;
1580         }
1581
1582         rc = hashtab_insert(h, key, usrdatum);
1583         if (rc)
1584                 goto bad;
1585         return 0;
1586 bad:
1587         user_destroy(key, usrdatum, NULL);
1588         return rc;
1589 }
1590
1591 static int sens_read(struct policydb *p, struct hashtab *h, void *fp)
1592 {
1593         char *key = NULL;
1594         struct level_datum *levdatum;
1595         int rc;
1596         __le32 buf[2];
1597         u32 len;
1598
1599         levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC);
1600         if (!levdatum)
1601                 return -ENOMEM;
1602
1603         rc = next_entry(buf, fp, sizeof buf);
1604         if (rc)
1605                 goto bad;
1606
1607         len = le32_to_cpu(buf[0]);
1608         levdatum->isalias = le32_to_cpu(buf[1]);
1609
1610         rc = str_read(&key, GFP_ATOMIC, fp, len);
1611         if (rc)
1612                 goto bad;
1613
1614         rc = -ENOMEM;
1615         levdatum->level = kmalloc(sizeof(*levdatum->level), GFP_ATOMIC);
1616         if (!levdatum->level)
1617                 goto bad;
1618
1619         rc = mls_read_level(levdatum->level, fp);
1620         if (rc)
1621                 goto bad;
1622
1623         rc = hashtab_insert(h, key, levdatum);
1624         if (rc)
1625                 goto bad;
1626         return 0;
1627 bad:
1628         sens_destroy(key, levdatum, NULL);
1629         return rc;
1630 }
1631
1632 static int cat_read(struct policydb *p, struct hashtab *h, void *fp)
1633 {
1634         char *key = NULL;
1635         struct cat_datum *catdatum;
1636         int rc;
1637         __le32 buf[3];
1638         u32 len;
1639
1640         catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC);
1641         if (!catdatum)
1642                 return -ENOMEM;
1643
1644         rc = next_entry(buf, fp, sizeof buf);
1645         if (rc)
1646                 goto bad;
1647
1648         len = le32_to_cpu(buf[0]);
1649         catdatum->value = le32_to_cpu(buf[1]);
1650         catdatum->isalias = le32_to_cpu(buf[2]);
1651
1652         rc = str_read(&key, GFP_ATOMIC, fp, len);
1653         if (rc)
1654                 goto bad;
1655
1656         rc = hashtab_insert(h, key, catdatum);
1657         if (rc)
1658                 goto bad;
1659         return 0;
1660 bad:
1661         cat_destroy(key, catdatum, NULL);
1662         return rc;
1663 }
1664
1665 static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, void *fp) =
1666 {
1667         common_read,
1668         class_read,
1669         role_read,
1670         type_read,
1671         user_read,
1672         cond_read_bool,
1673         sens_read,
1674         cat_read,
1675 };
1676
1677 static int user_bounds_sanity_check(void *key, void *datum, void *datap)
1678 {
1679         struct user_datum *upper, *user;
1680         struct policydb *p = datap;
1681         int depth = 0;
1682
1683         upper = user = datum;
1684         while (upper->bounds) {
1685                 struct ebitmap_node *node;
1686                 unsigned long bit;
1687
1688                 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1689                         pr_err("SELinux: user %s: "
1690                                "too deep or looped boundary",
1691                                (char *) key);
1692                         return -EINVAL;
1693                 }
1694
1695                 upper = p->user_val_to_struct[upper->bounds - 1];
1696                 ebitmap_for_each_positive_bit(&user->roles, node, bit) {
1697                         if (ebitmap_get_bit(&upper->roles, bit))
1698                                 continue;
1699
1700                         pr_err("SELinux: boundary violated policy: "
1701                                "user=%s role=%s bounds=%s\n",
1702                                sym_name(p, SYM_USERS, user->value - 1),
1703                                sym_name(p, SYM_ROLES, bit),
1704                                sym_name(p, SYM_USERS, upper->value - 1));
1705
1706                         return -EINVAL;
1707                 }
1708         }
1709
1710         return 0;
1711 }
1712
1713 static int role_bounds_sanity_check(void *key, void *datum, void *datap)
1714 {
1715         struct role_datum *upper, *role;
1716         struct policydb *p = datap;
1717         int depth = 0;
1718
1719         upper = role = datum;
1720         while (upper->bounds) {
1721                 struct ebitmap_node *node;
1722                 unsigned long bit;
1723
1724                 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1725                         pr_err("SELinux: role %s: "
1726                                "too deep or looped bounds\n",
1727                                (char *) key);
1728                         return -EINVAL;
1729                 }
1730
1731                 upper = p->role_val_to_struct[upper->bounds - 1];
1732                 ebitmap_for_each_positive_bit(&role->types, node, bit) {
1733                         if (ebitmap_get_bit(&upper->types, bit))
1734                                 continue;
1735
1736                         pr_err("SELinux: boundary violated policy: "
1737                                "role=%s type=%s bounds=%s\n",
1738                                sym_name(p, SYM_ROLES, role->value - 1),
1739                                sym_name(p, SYM_TYPES, bit),
1740                                sym_name(p, SYM_ROLES, upper->value - 1));
1741
1742                         return -EINVAL;
1743                 }
1744         }
1745
1746         return 0;
1747 }
1748
1749 static int type_bounds_sanity_check(void *key, void *datum, void *datap)
1750 {
1751         struct type_datum *upper;
1752         struct policydb *p = datap;
1753         int depth = 0;
1754
1755         upper = datum;
1756         while (upper->bounds) {
1757                 if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
1758                         pr_err("SELinux: type %s: "
1759                                "too deep or looped boundary\n",
1760                                (char *) key);
1761                         return -EINVAL;
1762                 }
1763
1764                 upper = flex_array_get_ptr(p->type_val_to_struct_array,
1765                                            upper->bounds - 1);
1766                 BUG_ON(!upper);
1767
1768                 if (upper->attribute) {
1769                         pr_err("SELinux: type %s: "
1770                                "bounded by attribute %s",
1771                                (char *) key,
1772                                sym_name(p, SYM_TYPES, upper->value - 1));
1773                         return -EINVAL;
1774                 }
1775         }
1776
1777         return 0;
1778 }
1779
1780 static int policydb_bounds_sanity_check(struct policydb *p)
1781 {
1782         int rc;
1783
1784         if (p->policyvers < POLICYDB_VERSION_BOUNDARY)
1785                 return 0;
1786
1787         rc = hashtab_map(p->p_users.table,
1788                          user_bounds_sanity_check, p);
1789         if (rc)
1790                 return rc;
1791
1792         rc = hashtab_map(p->p_roles.table,
1793                          role_bounds_sanity_check, p);
1794         if (rc)
1795                 return rc;
1796
1797         rc = hashtab_map(p->p_types.table,
1798                          type_bounds_sanity_check, p);
1799         if (rc)
1800                 return rc;
1801
1802         return 0;
1803 }
1804
1805 u16 string_to_security_class(struct policydb *p, const char *name)
1806 {
1807         struct class_datum *cladatum;
1808
1809         cladatum = hashtab_search(p->p_classes.table, name);
1810         if (!cladatum)
1811                 return 0;
1812
1813         return cladatum->value;
1814 }
1815
1816 u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name)
1817 {
1818         struct class_datum *cladatum;
1819         struct perm_datum *perdatum = NULL;
1820         struct common_datum *comdatum;
1821
1822         if (!tclass || tclass > p->p_classes.nprim)
1823                 return 0;
1824
1825         cladatum = p->class_val_to_struct[tclass-1];
1826         comdatum = cladatum->comdatum;
1827         if (comdatum)
1828                 perdatum = hashtab_search(comdatum->permissions.table,
1829                                           name);
1830         if (!perdatum)
1831                 perdatum = hashtab_search(cladatum->permissions.table,
1832                                           name);
1833         if (!perdatum)
1834                 return 0;
1835
1836         return 1U << (perdatum->value-1);
1837 }
1838
1839 static int range_read(struct policydb *p, void *fp)
1840 {
1841         struct range_trans *rt = NULL;
1842         struct mls_range *r = NULL;
1843         int i, rc;
1844         __le32 buf[2];
1845         u32 nel;
1846
1847         if (p->policyvers < POLICYDB_VERSION_MLS)
1848                 return 0;
1849
1850         rc = next_entry(buf, fp, sizeof(u32));
1851         if (rc)
1852                 return rc;
1853
1854         nel = le32_to_cpu(buf[0]);
1855         for (i = 0; i < nel; i++) {
1856                 rc = -ENOMEM;
1857                 rt = kzalloc(sizeof(*rt), GFP_KERNEL);
1858                 if (!rt)
1859                         goto out;
1860
1861                 rc = next_entry(buf, fp, (sizeof(u32) * 2));
1862                 if (rc)
1863                         goto out;
1864
1865                 rt->source_type = le32_to_cpu(buf[0]);
1866                 rt->target_type = le32_to_cpu(buf[1]);
1867                 if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
1868                         rc = next_entry(buf, fp, sizeof(u32));
1869                         if (rc)
1870                                 goto out;
1871                         rt->target_class = le32_to_cpu(buf[0]);
1872                 } else
1873                         rt->target_class = p->process_class;
1874
1875                 rc = -EINVAL;
1876                 if (!policydb_type_isvalid(p, rt->source_type) ||
1877                     !policydb_type_isvalid(p, rt->target_type) ||
1878                     !policydb_class_isvalid(p, rt->target_class))
1879                         goto out;
1880
1881                 rc = -ENOMEM;
1882                 r = kzalloc(sizeof(*r), GFP_KERNEL);
1883                 if (!r)
1884                         goto out;
1885
1886                 rc = mls_read_range_helper(r, fp);
1887                 if (rc)
1888                         goto out;
1889
1890                 rc = -EINVAL;
1891                 if (!mls_range_isvalid(p, r)) {
1892                         pr_warn("SELinux:  rangetrans:  invalid range\n");
1893                         goto out;
1894                 }
1895
1896                 rc = hashtab_insert(p->range_tr, rt, r);
1897                 if (rc)
1898                         goto out;
1899
1900                 rt = NULL;
1901                 r = NULL;
1902         }
1903         hash_eval(p->range_tr, "rangetr");
1904         rc = 0;
1905 out:
1906         kfree(rt);
1907         kfree(r);
1908         return rc;
1909 }
1910
1911 static int filename_trans_read(struct policydb *p, void *fp)
1912 {
1913         struct filename_trans *ft;
1914         struct filename_trans_datum *otype;
1915         char *name;
1916         u32 nel, len;
1917         __le32 buf[4];
1918         int rc, i;
1919
1920         if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
1921                 return 0;
1922
1923         rc = next_entry(buf, fp, sizeof(u32));
1924         if (rc)
1925                 return rc;
1926         nel = le32_to_cpu(buf[0]);
1927
1928         for (i = 0; i < nel; i++) {
1929                 otype = NULL;
1930                 name = NULL;
1931
1932                 rc = -ENOMEM;
1933                 ft = kzalloc(sizeof(*ft), GFP_KERNEL);
1934                 if (!ft)
1935                         goto out;
1936
1937                 rc = -ENOMEM;
1938                 otype = kmalloc(sizeof(*otype), GFP_KERNEL);
1939                 if (!otype)
1940                         goto out;
1941
1942                 /* length of the path component string */
1943                 rc = next_entry(buf, fp, sizeof(u32));
1944                 if (rc)
1945                         goto out;
1946                 len = le32_to_cpu(buf[0]);
1947
1948                 /* path component string */
1949                 rc = str_read(&name, GFP_KERNEL, fp, len);
1950                 if (rc)
1951                         goto out;
1952
1953                 ft->name = name;
1954
1955                 rc = next_entry(buf, fp, sizeof(u32) * 4);
1956                 if (rc)
1957                         goto out;
1958
1959                 ft->stype = le32_to_cpu(buf[0]);
1960                 ft->ttype = le32_to_cpu(buf[1]);
1961                 ft->tclass = le32_to_cpu(buf[2]);
1962
1963                 otype->otype = le32_to_cpu(buf[3]);
1964
1965                 rc = ebitmap_set_bit(&p->filename_trans_ttypes, ft->ttype, 1);
1966                 if (rc)
1967                         goto out;
1968
1969                 rc = hashtab_insert(p->filename_trans, ft, otype);
1970                 if (rc) {
1971                         /*
1972                          * Do not return -EEXIST to the caller, or the system
1973                          * will not boot.
1974                          */
1975                         if (rc != -EEXIST)
1976                                 goto out;
1977                         /* But free memory to avoid memory leak. */
1978                         kfree(ft);
1979                         kfree(name);
1980                         kfree(otype);
1981                 }
1982         }
1983         hash_eval(p->filename_trans, "filenametr");
1984         return 0;
1985 out:
1986         kfree(ft);
1987         kfree(name);
1988         kfree(otype);
1989
1990         return rc;
1991 }
1992
1993 static int genfs_read(struct policydb *p, void *fp)
1994 {
1995         int i, j, rc;
1996         u32 nel, nel2, len, len2;
1997         __le32 buf[1];
1998         struct ocontext *l, *c;
1999         struct ocontext *newc = NULL;
2000         struct genfs *genfs_p, *genfs;
2001         struct genfs *newgenfs = NULL;
2002
2003         rc = next_entry(buf, fp, sizeof(u32));
2004         if (rc)
2005                 return rc;
2006         nel = le32_to_cpu(buf[0]);
2007
2008         for (i = 0; i < nel; i++) {
2009                 rc = next_entry(buf, fp, sizeof(u32));
2010                 if (rc)
2011                         goto out;
2012                 len = le32_to_cpu(buf[0]);
2013
2014                 rc = -ENOMEM;
2015                 newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
2016                 if (!newgenfs)
2017                         goto out;
2018
2019                 rc = str_read(&newgenfs->fstype, GFP_KERNEL, fp, len);
2020                 if (rc)
2021                         goto out;
2022
2023                 for (genfs_p = NULL, genfs = p->genfs; genfs;
2024                      genfs_p = genfs, genfs = genfs->next) {
2025                         rc = -EINVAL;
2026                         if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
2027                                 pr_err("SELinux:  dup genfs fstype %s\n",
2028                                        newgenfs->fstype);
2029                                 goto out;
2030                         }
2031                         if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
2032                                 break;
2033                 }
2034                 newgenfs->next = genfs;
2035                 if (genfs_p)
2036                         genfs_p->next = newgenfs;
2037                 else
2038                         p->genfs = newgenfs;
2039                 genfs = newgenfs;
2040                 newgenfs = NULL;
2041
2042                 rc = next_entry(buf, fp, sizeof(u32));
2043                 if (rc)
2044                         goto out;
2045
2046                 nel2 = le32_to_cpu(buf[0]);
2047                 for (j = 0; j < nel2; j++) {
2048                         rc = next_entry(buf, fp, sizeof(u32));
2049                         if (rc)
2050                                 goto out;
2051                         len = le32_to_cpu(buf[0]);
2052
2053                         rc = -ENOMEM;
2054                         newc = kzalloc(sizeof(*newc), GFP_KERNEL);
2055                         if (!newc)
2056                                 goto out;
2057
2058                         rc = str_read(&newc->u.name, GFP_KERNEL, fp, len);
2059                         if (rc)
2060                                 goto out;
2061
2062                         rc = next_entry(buf, fp, sizeof(u32));
2063                         if (rc)
2064                                 goto out;
2065
2066                         newc->v.sclass = le32_to_cpu(buf[0]);
2067                         rc = context_read_and_validate(&newc->context[0], p, fp);
2068                         if (rc)
2069                                 goto out;
2070
2071                         for (l = NULL, c = genfs->head; c;
2072                              l = c, c = c->next) {
2073                                 rc = -EINVAL;
2074                                 if (!strcmp(newc->u.name, c->u.name) &&
2075                                     (!c->v.sclass || !newc->v.sclass ||
2076                                      newc->v.sclass == c->v.sclass)) {
2077                                         pr_err("SELinux:  dup genfs entry (%s,%s)\n",
2078                                                genfs->fstype, c->u.name);
2079                                         goto out;
2080                                 }
2081                                 len = strlen(newc->u.name);
2082                                 len2 = strlen(c->u.name);
2083                                 if (len > len2)
2084                                         break;
2085                         }
2086
2087                         newc->next = c;
2088                         if (l)
2089                                 l->next = newc;
2090                         else
2091                                 genfs->head = newc;
2092                         newc = NULL;
2093                 }
2094         }
2095         rc = 0;
2096 out:
2097         if (newgenfs) {
2098                 kfree(newgenfs->fstype);
2099                 kfree(newgenfs);
2100         }
2101         ocontext_destroy(newc, OCON_FSUSE);
2102
2103         return rc;
2104 }
2105
2106 static int ocontext_read(struct policydb *p, struct policydb_compat_info *info,
2107                          void *fp)
2108 {
2109         int i, j, rc;
2110         u32 nel, len;
2111         __le32 buf[3];
2112         struct ocontext *l, *c;
2113         u32 nodebuf[8];
2114
2115         for (i = 0; i < info->ocon_num; i++) {
2116                 rc = next_entry(buf, fp, sizeof(u32));
2117                 if (rc)
2118                         goto out;
2119                 nel = le32_to_cpu(buf[0]);
2120
2121                 l = NULL;
2122                 for (j = 0; j < nel; j++) {
2123                         rc = -ENOMEM;
2124                         c = kzalloc(sizeof(*c), GFP_KERNEL);
2125                         if (!c)
2126                                 goto out;
2127                         if (l)
2128                                 l->next = c;
2129                         else
2130                                 p->ocontexts[i] = c;
2131                         l = c;
2132
2133                         switch (i) {
2134                         case OCON_ISID:
2135                                 rc = next_entry(buf, fp, sizeof(u32));
2136                                 if (rc)
2137                                         goto out;
2138
2139                                 c->sid[0] = le32_to_cpu(buf[0]);
2140                                 rc = context_read_and_validate(&c->context[0], p, fp);
2141                                 if (rc)
2142                                         goto out;
2143                                 break;
2144                         case OCON_FS:
2145                         case OCON_NETIF:
2146                                 rc = next_entry(buf, fp, sizeof(u32));
2147                                 if (rc)
2148                                         goto out;
2149                                 len = le32_to_cpu(buf[0]);
2150
2151                                 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2152                                 if (rc)
2153                                         goto out;
2154
2155                                 rc = context_read_and_validate(&c->context[0], p, fp);
2156                                 if (rc)
2157                                         goto out;
2158                                 rc = context_read_and_validate(&c->context[1], p, fp);
2159                                 if (rc)
2160                                         goto out;
2161                                 break;
2162                         case OCON_PORT:
2163                                 rc = next_entry(buf, fp, sizeof(u32)*3);
2164                                 if (rc)
2165                                         goto out;
2166                                 c->u.port.protocol = le32_to_cpu(buf[0]);
2167                                 c->u.port.low_port = le32_to_cpu(buf[1]);
2168                                 c->u.port.high_port = le32_to_cpu(buf[2]);
2169                                 rc = context_read_and_validate(&c->context[0], p, fp);
2170                                 if (rc)
2171                                         goto out;
2172                                 break;
2173                         case OCON_NODE:
2174                                 rc = next_entry(nodebuf, fp, sizeof(u32) * 2);
2175                                 if (rc)
2176                                         goto out;
2177                                 c->u.node.addr = nodebuf[0]; /* network order */
2178                                 c->u.node.mask = nodebuf[1]; /* network order */
2179                                 rc = context_read_and_validate(&c->context[0], p, fp);
2180                                 if (rc)
2181                                         goto out;
2182                                 break;
2183                         case OCON_FSUSE:
2184                                 rc = next_entry(buf, fp, sizeof(u32)*2);
2185                                 if (rc)
2186                                         goto out;
2187
2188                                 rc = -EINVAL;
2189                                 c->v.behavior = le32_to_cpu(buf[0]);
2190                                 /* Determined at runtime, not in policy DB. */
2191                                 if (c->v.behavior == SECURITY_FS_USE_MNTPOINT)
2192                                         goto out;
2193                                 if (c->v.behavior > SECURITY_FS_USE_MAX)
2194                                         goto out;
2195
2196                                 len = le32_to_cpu(buf[1]);
2197                                 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2198                                 if (rc)
2199                                         goto out;
2200
2201                                 rc = context_read_and_validate(&c->context[0], p, fp);
2202                                 if (rc)
2203                                         goto out;
2204                                 break;
2205                         case OCON_NODE6: {
2206                                 int k;
2207
2208                                 rc = next_entry(nodebuf, fp, sizeof(u32) * 8);
2209                                 if (rc)
2210                                         goto out;
2211                                 for (k = 0; k < 4; k++)
2212                                         c->u.node6.addr[k] = nodebuf[k];
2213                                 for (k = 0; k < 4; k++)
2214                                         c->u.node6.mask[k] = nodebuf[k+4];
2215                                 rc = context_read_and_validate(&c->context[0], p, fp);
2216                                 if (rc)
2217                                         goto out;
2218                                 break;
2219                         }
2220                         case OCON_IBPKEY:
2221                                 rc = next_entry(nodebuf, fp, sizeof(u32) * 4);
2222                                 if (rc)
2223                                         goto out;
2224
2225                                 c->u.ibpkey.subnet_prefix = be64_to_cpu(*((__be64 *)nodebuf));
2226
2227                                 if (nodebuf[2] > 0xffff ||
2228                                     nodebuf[3] > 0xffff) {
2229                                         rc = -EINVAL;
2230                                         goto out;
2231                                 }
2232
2233                                 c->u.ibpkey.low_pkey = le32_to_cpu(nodebuf[2]);
2234                                 c->u.ibpkey.high_pkey = le32_to_cpu(nodebuf[3]);
2235
2236                                 rc = context_read_and_validate(&c->context[0],
2237                                                                p,
2238                                                                fp);
2239                                 if (rc)
2240                                         goto out;
2241                                 break;
2242                         case OCON_IBENDPORT:
2243                                 rc = next_entry(buf, fp, sizeof(u32) * 2);
2244                                 if (rc)
2245                                         goto out;
2246                                 len = le32_to_cpu(buf[0]);
2247
2248                                 rc = str_read(&c->u.ibendport.dev_name, GFP_KERNEL, fp, len);
2249                                 if (rc)
2250                                         goto out;
2251
2252                                 if (buf[1] > 0xff || buf[1] == 0) {
2253                                         rc = -EINVAL;
2254                                         goto out;
2255                                 }
2256
2257                                 c->u.ibendport.port = le32_to_cpu(buf[1]);
2258
2259                                 rc = context_read_and_validate(&c->context[0],
2260                                                                p,
2261                                                                fp);
2262                                 if (rc)
2263                                         goto out;
2264                                 break;
2265                         }
2266                 }
2267         }
2268         rc = 0;
2269 out:
2270         return rc;
2271 }
2272
2273 /*
2274  * Read the configuration data from a policy database binary
2275  * representation file into a policy database structure.
2276  */
2277 int policydb_read(struct policydb *p, void *fp)
2278 {
2279         struct role_allow *ra, *lra;
2280         struct role_trans *tr, *ltr;
2281         int i, j, rc;
2282         __le32 buf[4];
2283         u32 len, nprim, nel;
2284
2285         char *policydb_str;
2286         struct policydb_compat_info *info;
2287
2288         rc = policydb_init(p);
2289         if (rc)
2290                 return rc;
2291
2292         /* Read the magic number and string length. */
2293         rc = next_entry(buf, fp, sizeof(u32) * 2);
2294         if (rc)
2295                 goto bad;
2296
2297         rc = -EINVAL;
2298         if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
2299                 pr_err("SELinux:  policydb magic number 0x%x does "
2300                        "not match expected magic number 0x%x\n",
2301                        le32_to_cpu(buf[0]), POLICYDB_MAGIC);
2302                 goto bad;
2303         }
2304
2305         rc = -EINVAL;
2306         len = le32_to_cpu(buf[1]);
2307         if (len != strlen(POLICYDB_STRING)) {
2308                 pr_err("SELinux:  policydb string length %d does not "
2309                        "match expected length %zu\n",
2310                        len, strlen(POLICYDB_STRING));
2311                 goto bad;
2312         }
2313
2314         rc = -ENOMEM;
2315         policydb_str = kmalloc(len + 1, GFP_KERNEL);
2316         if (!policydb_str) {
2317                 pr_err("SELinux:  unable to allocate memory for policydb "
2318                        "string of length %d\n", len);
2319                 goto bad;
2320         }
2321
2322         rc = next_entry(policydb_str, fp, len);
2323         if (rc) {
2324                 pr_err("SELinux:  truncated policydb string identifier\n");
2325                 kfree(policydb_str);
2326                 goto bad;
2327         }
2328
2329         rc = -EINVAL;
2330         policydb_str[len] = '\0';
2331         if (strcmp(policydb_str, POLICYDB_STRING)) {
2332                 pr_err("SELinux:  policydb string %s does not match "
2333                        "my string %s\n", policydb_str, POLICYDB_STRING);
2334                 kfree(policydb_str);
2335                 goto bad;
2336         }
2337         /* Done with policydb_str. */
2338         kfree(policydb_str);
2339         policydb_str = NULL;
2340
2341         /* Read the version and table sizes. */
2342         rc = next_entry(buf, fp, sizeof(u32)*4);
2343         if (rc)
2344                 goto bad;
2345
2346         rc = -EINVAL;
2347         p->policyvers = le32_to_cpu(buf[0]);
2348         if (p->policyvers < POLICYDB_VERSION_MIN ||
2349             p->policyvers > POLICYDB_VERSION_MAX) {
2350                 pr_err("SELinux:  policydb version %d does not match "
2351                        "my version range %d-%d\n",
2352                        le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
2353                 goto bad;
2354         }
2355
2356         if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
2357                 p->mls_enabled = 1;
2358
2359                 rc = -EINVAL;
2360                 if (p->policyvers < POLICYDB_VERSION_MLS) {
2361                         pr_err("SELinux: security policydb version %d "
2362                                 "(MLS) not backwards compatible\n",
2363                                 p->policyvers);
2364                         goto bad;
2365                 }
2366         }
2367         p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
2368         p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
2369
2370         if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
2371                 rc = ebitmap_read(&p->policycaps, fp);
2372                 if (rc)
2373                         goto bad;
2374         }
2375
2376         if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
2377                 rc = ebitmap_read(&p->permissive_map, fp);
2378                 if (rc)
2379                         goto bad;
2380         }
2381
2382         rc = -EINVAL;
2383         info = policydb_lookup_compat(p->policyvers);
2384         if (!info) {
2385                 pr_err("SELinux:  unable to find policy compat info "
2386                        "for version %d\n", p->policyvers);
2387                 goto bad;
2388         }
2389
2390         rc = -EINVAL;
2391         if (le32_to_cpu(buf[2]) != info->sym_num ||
2392                 le32_to_cpu(buf[3]) != info->ocon_num) {
2393                 pr_err("SELinux:  policydb table sizes (%d,%d) do "
2394                        "not match mine (%d,%d)\n", le32_to_cpu(buf[2]),
2395                         le32_to_cpu(buf[3]),
2396                        info->sym_num, info->ocon_num);
2397                 goto bad;
2398         }
2399
2400         for (i = 0; i < info->sym_num; i++) {
2401                 rc = next_entry(buf, fp, sizeof(u32)*2);
2402                 if (rc)
2403                         goto bad;
2404                 nprim = le32_to_cpu(buf[0]);
2405                 nel = le32_to_cpu(buf[1]);
2406                 for (j = 0; j < nel; j++) {
2407                         rc = read_f[i](p, p->symtab[i].table, fp);
2408                         if (rc)
2409                                 goto bad;
2410                 }
2411
2412                 p->symtab[i].nprim = nprim;
2413         }
2414
2415         rc = -EINVAL;
2416         p->process_class = string_to_security_class(p, "process");
2417         if (!p->process_class)
2418                 goto bad;
2419
2420         rc = avtab_read(&p->te_avtab, fp, p);
2421         if (rc)
2422                 goto bad;
2423
2424         if (p->policyvers >= POLICYDB_VERSION_BOOL) {
2425                 rc = cond_read_list(p, fp);
2426                 if (rc)
2427                         goto bad;
2428         }
2429
2430         rc = next_entry(buf, fp, sizeof(u32));
2431         if (rc)
2432                 goto bad;
2433         nel = le32_to_cpu(buf[0]);
2434         ltr = NULL;
2435         for (i = 0; i < nel; i++) {
2436                 rc = -ENOMEM;
2437                 tr = kzalloc(sizeof(*tr), GFP_KERNEL);
2438                 if (!tr)
2439                         goto bad;
2440                 if (ltr)
2441                         ltr->next = tr;
2442                 else
2443                         p->role_tr = tr;
2444                 rc = next_entry(buf, fp, sizeof(u32)*3);
2445                 if (rc)
2446                         goto bad;
2447
2448                 rc = -EINVAL;
2449                 tr->role = le32_to_cpu(buf[0]);
2450                 tr->type = le32_to_cpu(buf[1]);
2451                 tr->new_role = le32_to_cpu(buf[2]);
2452                 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2453                         rc = next_entry(buf, fp, sizeof(u32));
2454                         if (rc)
2455                                 goto bad;
2456                         tr->tclass = le32_to_cpu(buf[0]);
2457                 } else
2458                         tr->tclass = p->process_class;
2459
2460                 rc = -EINVAL;
2461                 if (!policydb_role_isvalid(p, tr->role) ||
2462                     !policydb_type_isvalid(p, tr->type) ||
2463                     !policydb_class_isvalid(p, tr->tclass) ||
2464                     !policydb_role_isvalid(p, tr->new_role))
2465                         goto bad;
2466                 ltr = tr;
2467         }
2468
2469         rc = next_entry(buf, fp, sizeof(u32));
2470         if (rc)
2471                 goto bad;
2472         nel = le32_to_cpu(buf[0]);
2473         lra = NULL;
2474         for (i = 0; i < nel; i++) {
2475                 rc = -ENOMEM;
2476                 ra = kzalloc(sizeof(*ra), GFP_KERNEL);
2477                 if (!ra)
2478                         goto bad;
2479                 if (lra)
2480                         lra->next = ra;
2481                 else
2482                         p->role_allow = ra;
2483                 rc = next_entry(buf, fp, sizeof(u32)*2);
2484                 if (rc)
2485                         goto bad;
2486
2487                 rc = -EINVAL;
2488                 ra->role = le32_to_cpu(buf[0]);
2489                 ra->new_role = le32_to_cpu(buf[1]);
2490                 if (!policydb_role_isvalid(p, ra->role) ||
2491                     !policydb_role_isvalid(p, ra->new_role))
2492                         goto bad;
2493                 lra = ra;
2494         }
2495
2496         rc = filename_trans_read(p, fp);
2497         if (rc)
2498                 goto bad;
2499
2500         rc = policydb_index(p);
2501         if (rc)
2502                 goto bad;
2503
2504         rc = -EINVAL;
2505         p->process_trans_perms = string_to_av_perm(p, p->process_class, "transition");
2506         p->process_trans_perms |= string_to_av_perm(p, p->process_class, "dyntransition");
2507         if (!p->process_trans_perms)
2508                 goto bad;
2509
2510         rc = ocontext_read(p, info, fp);
2511         if (rc)
2512                 goto bad;
2513
2514         rc = genfs_read(p, fp);
2515         if (rc)
2516                 goto bad;
2517
2518         rc = range_read(p, fp);
2519         if (rc)
2520                 goto bad;
2521
2522         rc = -ENOMEM;
2523         p->type_attr_map_array = flex_array_alloc(sizeof(struct ebitmap),
2524                                                   p->p_types.nprim,
2525                                                   GFP_KERNEL | __GFP_ZERO);
2526         if (!p->type_attr_map_array)
2527                 goto bad;
2528
2529         /* preallocate so we don't have to worry about the put ever failing */
2530         rc = flex_array_prealloc(p->type_attr_map_array, 0, p->p_types.nprim,
2531                                  GFP_KERNEL | __GFP_ZERO);
2532         if (rc)
2533                 goto bad;
2534
2535         for (i = 0; i < p->p_types.nprim; i++) {
2536                 struct ebitmap *e = flex_array_get(p->type_attr_map_array, i);
2537
2538                 BUG_ON(!e);
2539                 ebitmap_init(e);
2540                 if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
2541                         rc = ebitmap_read(e, fp);
2542                         if (rc)
2543                                 goto bad;
2544                 }
2545                 /* add the type itself as the degenerate case */
2546                 rc = ebitmap_set_bit(e, i, 1);
2547                 if (rc)
2548                         goto bad;
2549         }
2550
2551         rc = policydb_bounds_sanity_check(p);
2552         if (rc)
2553                 goto bad;
2554
2555         rc = 0;
2556 out:
2557         return rc;
2558 bad:
2559         policydb_destroy(p);
2560         goto out;
2561 }
2562
2563 /*
2564  * Write a MLS level structure to a policydb binary
2565  * representation file.
2566  */
2567 static int mls_write_level(struct mls_level *l, void *fp)
2568 {
2569         __le32 buf[1];
2570         int rc;
2571
2572         buf[0] = cpu_to_le32(l->sens);
2573         rc = put_entry(buf, sizeof(u32), 1, fp);
2574         if (rc)
2575                 return rc;
2576
2577         rc = ebitmap_write(&l->cat, fp);
2578         if (rc)
2579                 return rc;
2580
2581         return 0;
2582 }
2583
2584 /*
2585  * Write a MLS range structure to a policydb binary
2586  * representation file.
2587  */
2588 static int mls_write_range_helper(struct mls_range *r, void *fp)
2589 {
2590         __le32 buf[3];
2591         size_t items;
2592         int rc, eq;
2593
2594         eq = mls_level_eq(&r->level[1], &r->level[0]);
2595
2596         if (eq)
2597                 items = 2;
2598         else
2599                 items = 3;
2600         buf[0] = cpu_to_le32(items-1);
2601         buf[1] = cpu_to_le32(r->level[0].sens);
2602         if (!eq)
2603                 buf[2] = cpu_to_le32(r->level[1].sens);
2604
2605         BUG_ON(items > ARRAY_SIZE(buf));
2606
2607         rc = put_entry(buf, sizeof(u32), items, fp);
2608         if (rc)
2609                 return rc;
2610
2611         rc = ebitmap_write(&r->level[0].cat, fp);
2612         if (rc)
2613                 return rc;
2614         if (!eq) {
2615                 rc = ebitmap_write(&r->level[1].cat, fp);
2616                 if (rc)
2617                         return rc;
2618         }
2619
2620         return 0;
2621 }
2622
2623 static int sens_write(void *vkey, void *datum, void *ptr)
2624 {
2625         char *key = vkey;
2626         struct level_datum *levdatum = datum;
2627         struct policy_data *pd = ptr;
2628         void *fp = pd->fp;
2629         __le32 buf[2];
2630         size_t len;
2631         int rc;
2632
2633         len = strlen(key);
2634         buf[0] = cpu_to_le32(len);
2635         buf[1] = cpu_to_le32(levdatum->isalias);
2636         rc = put_entry(buf, sizeof(u32), 2, fp);
2637         if (rc)
2638                 return rc;
2639
2640         rc = put_entry(key, 1, len, fp);
2641         if (rc)
2642                 return rc;
2643
2644         rc = mls_write_level(levdatum->level, fp);
2645         if (rc)
2646                 return rc;
2647
2648         return 0;
2649 }
2650
2651 static int cat_write(void *vkey, void *datum, void *ptr)
2652 {
2653         char *key = vkey;
2654         struct cat_datum *catdatum = datum;
2655         struct policy_data *pd = ptr;
2656         void *fp = pd->fp;
2657         __le32 buf[3];
2658         size_t len;
2659         int rc;
2660
2661         len = strlen(key);
2662         buf[0] = cpu_to_le32(len);
2663         buf[1] = cpu_to_le32(catdatum->value);
2664         buf[2] = cpu_to_le32(catdatum->isalias);
2665         rc = put_entry(buf, sizeof(u32), 3, fp);
2666         if (rc)
2667                 return rc;
2668
2669         rc = put_entry(key, 1, len, fp);
2670         if (rc)
2671                 return rc;
2672
2673         return 0;
2674 }
2675
2676 static int role_trans_write(struct policydb *p, void *fp)
2677 {
2678         struct role_trans *r = p->role_tr;
2679         struct role_trans *tr;
2680         u32 buf[3];
2681         size_t nel;
2682         int rc;
2683
2684         nel = 0;
2685         for (tr = r; tr; tr = tr->next)
2686                 nel++;
2687         buf[0] = cpu_to_le32(nel);
2688         rc = put_entry(buf, sizeof(u32), 1, fp);
2689         if (rc)
2690                 return rc;
2691         for (tr = r; tr; tr = tr->next) {
2692                 buf[0] = cpu_to_le32(tr->role);
2693                 buf[1] = cpu_to_le32(tr->type);
2694                 buf[2] = cpu_to_le32(tr->new_role);
2695                 rc = put_entry(buf, sizeof(u32), 3, fp);
2696                 if (rc)
2697                         return rc;
2698                 if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
2699                         buf[0] = cpu_to_le32(tr->tclass);
2700                         rc = put_entry(buf, sizeof(u32), 1, fp);
2701                         if (rc)
2702                                 return rc;
2703                 }
2704         }
2705
2706         return 0;
2707 }
2708
2709 static int role_allow_write(struct role_allow *r, void *fp)
2710 {
2711         struct role_allow *ra;
2712         u32 buf[2];
2713         size_t nel;
2714         int rc;
2715
2716         nel = 0;
2717         for (ra = r; ra; ra = ra->next)
2718                 nel++;
2719         buf[0] = cpu_to_le32(nel);
2720         rc = put_entry(buf, sizeof(u32), 1, fp);
2721         if (rc)
2722                 return rc;
2723         for (ra = r; ra; ra = ra->next) {
2724                 buf[0] = cpu_to_le32(ra->role);
2725                 buf[1] = cpu_to_le32(ra->new_role);
2726                 rc = put_entry(buf, sizeof(u32), 2, fp);
2727                 if (rc)
2728                         return rc;
2729         }
2730         return 0;
2731 }
2732
2733 /*
2734  * Write a security context structure
2735  * to a policydb binary representation file.
2736  */
2737 static int context_write(struct policydb *p, struct context *c,
2738                          void *fp)
2739 {
2740         int rc;
2741         __le32 buf[3];
2742
2743         buf[0] = cpu_to_le32(c->user);
2744         buf[1] = cpu_to_le32(c->role);
2745         buf[2] = cpu_to_le32(c->type);
2746
2747         rc = put_entry(buf, sizeof(u32), 3, fp);
2748         if (rc)
2749                 return rc;
2750
2751         rc = mls_write_range_helper(&c->range, fp);
2752         if (rc)
2753                 return rc;
2754
2755         return 0;
2756 }
2757
2758 /*
2759  * The following *_write functions are used to
2760  * write the symbol data to a policy database
2761  * binary representation file.
2762  */
2763
2764 static int perm_write(void *vkey, void *datum, void *fp)
2765 {
2766         char *key = vkey;
2767         struct perm_datum *perdatum = datum;
2768         __le32 buf[2];
2769         size_t len;
2770         int rc;
2771
2772         len = strlen(key);
2773         buf[0] = cpu_to_le32(len);
2774         buf[1] = cpu_to_le32(perdatum->value);
2775         rc = put_entry(buf, sizeof(u32), 2, fp);
2776         if (rc)
2777                 return rc;
2778
2779         rc = put_entry(key, 1, len, fp);
2780         if (rc)
2781                 return rc;
2782
2783         return 0;
2784 }
2785
2786 static int common_write(void *vkey, void *datum, void *ptr)
2787 {
2788         char *key = vkey;
2789         struct common_datum *comdatum = datum;
2790         struct policy_data *pd = ptr;
2791         void *fp = pd->fp;
2792         __le32 buf[4];
2793         size_t len;
2794         int rc;
2795
2796         len = strlen(key);
2797         buf[0] = cpu_to_le32(len);
2798         buf[1] = cpu_to_le32(comdatum->value);
2799         buf[2] = cpu_to_le32(comdatum->permissions.nprim);
2800         buf[3] = cpu_to_le32(comdatum->permissions.table->nel);
2801         rc = put_entry(buf, sizeof(u32), 4, fp);
2802         if (rc)
2803                 return rc;
2804
2805         rc = put_entry(key, 1, len, fp);
2806         if (rc)
2807                 return rc;
2808
2809         rc = hashtab_map(comdatum->permissions.table, perm_write, fp);
2810         if (rc)
2811                 return rc;
2812
2813         return 0;
2814 }
2815
2816 static int type_set_write(struct type_set *t, void *fp)
2817 {
2818         int rc;
2819         __le32 buf[1];
2820
2821         if (ebitmap_write(&t->types, fp))
2822                 return -EINVAL;
2823         if (ebitmap_write(&t->negset, fp))
2824                 return -EINVAL;
2825
2826         buf[0] = cpu_to_le32(t->flags);
2827         rc = put_entry(buf, sizeof(u32), 1, fp);
2828         if (rc)
2829                 return -EINVAL;
2830
2831         return 0;
2832 }
2833
2834 static int write_cons_helper(struct policydb *p, struct constraint_node *node,
2835                              void *fp)
2836 {
2837         struct constraint_node *c;
2838         struct constraint_expr *e;
2839         __le32 buf[3];
2840         u32 nel;
2841         int rc;
2842
2843         for (c = node; c; c = c->next) {
2844                 nel = 0;
2845                 for (e = c->expr; e; e = e->next)
2846                         nel++;
2847                 buf[0] = cpu_to_le32(c->permissions);
2848                 buf[1] = cpu_to_le32(nel);
2849                 rc = put_entry(buf, sizeof(u32), 2, fp);
2850                 if (rc)
2851                         return rc;
2852                 for (e = c->expr; e; e = e->next) {
2853                         buf[0] = cpu_to_le32(e->expr_type);
2854                         buf[1] = cpu_to_le32(e->attr);
2855                         buf[2] = cpu_to_le32(e->op);
2856                         rc = put_entry(buf, sizeof(u32), 3, fp);
2857                         if (rc)
2858                                 return rc;
2859
2860                         switch (e->expr_type) {
2861                         case CEXPR_NAMES:
2862                                 rc = ebitmap_write(&e->names, fp);
2863                                 if (rc)
2864                                         return rc;
2865                                 if (p->policyvers >=
2866                                         POLICYDB_VERSION_CONSTRAINT_NAMES) {
2867                                         rc = type_set_write(e->type_names, fp);
2868                                         if (rc)
2869                                                 return rc;
2870                                 }
2871                                 break;
2872                         default:
2873                                 break;
2874                         }
2875                 }
2876         }
2877
2878         return 0;
2879 }
2880
2881 static int class_write(void *vkey, void *datum, void *ptr)
2882 {
2883         char *key = vkey;
2884         struct class_datum *cladatum = datum;
2885         struct policy_data *pd = ptr;
2886         void *fp = pd->fp;
2887         struct policydb *p = pd->p;
2888         struct constraint_node *c;
2889         __le32 buf[6];
2890         u32 ncons;
2891         size_t len, len2;
2892         int rc;
2893
2894         len = strlen(key);
2895         if (cladatum->comkey)
2896                 len2 = strlen(cladatum->comkey);
2897         else
2898                 len2 = 0;
2899
2900         ncons = 0;
2901         for (c = cladatum->constraints; c; c = c->next)
2902                 ncons++;
2903
2904         buf[0] = cpu_to_le32(len);
2905         buf[1] = cpu_to_le32(len2);
2906         buf[2] = cpu_to_le32(cladatum->value);
2907         buf[3] = cpu_to_le32(cladatum->permissions.nprim);
2908         if (cladatum->permissions.table)
2909                 buf[4] = cpu_to_le32(cladatum->permissions.table->nel);
2910         else
2911                 buf[4] = 0;
2912         buf[5] = cpu_to_le32(ncons);
2913         rc = put_entry(buf, sizeof(u32), 6, fp);
2914         if (rc)
2915                 return rc;
2916
2917         rc = put_entry(key, 1, len, fp);
2918         if (rc)
2919                 return rc;
2920
2921         if (cladatum->comkey) {
2922                 rc = put_entry(cladatum->comkey, 1, len2, fp);
2923                 if (rc)
2924                         return rc;
2925         }
2926
2927         rc = hashtab_map(cladatum->permissions.table, perm_write, fp);
2928         if (rc)
2929                 return rc;
2930
2931         rc = write_cons_helper(p, cladatum->constraints, fp);
2932         if (rc)
2933                 return rc;
2934
2935         /* write out the validatetrans rule */
2936         ncons = 0;
2937         for (c = cladatum->validatetrans; c; c = c->next)
2938                 ncons++;
2939
2940         buf[0] = cpu_to_le32(ncons);
2941         rc = put_entry(buf, sizeof(u32), 1, fp);
2942         if (rc)
2943                 return rc;
2944
2945         rc = write_cons_helper(p, cladatum->validatetrans, fp);
2946         if (rc)
2947                 return rc;
2948
2949         if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
2950                 buf[0] = cpu_to_le32(cladatum->default_user);
2951                 buf[1] = cpu_to_le32(cladatum->default_role);
2952                 buf[2] = cpu_to_le32(cladatum->default_range);
2953
2954                 rc = put_entry(buf, sizeof(uint32_t), 3, fp);
2955                 if (rc)
2956                         return rc;
2957         }
2958
2959         if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
2960                 buf[0] = cpu_to_le32(cladatum->default_type);
2961                 rc = put_entry(buf, sizeof(uint32_t), 1, fp);
2962                 if (rc)
2963                         return rc;
2964         }
2965
2966         return 0;
2967 }
2968
2969 static int role_write(void *vkey, void *datum, void *ptr)
2970 {
2971         char *key = vkey;
2972         struct role_datum *role = datum;
2973         struct policy_data *pd = ptr;
2974         void *fp = pd->fp;
2975         struct policydb *p = pd->p;
2976         __le32 buf[3];
2977         size_t items, len;
2978         int rc;
2979
2980         len = strlen(key);
2981         items = 0;
2982         buf[items++] = cpu_to_le32(len);
2983         buf[items++] = cpu_to_le32(role->value);
2984         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
2985                 buf[items++] = cpu_to_le32(role->bounds);
2986
2987         BUG_ON(items > ARRAY_SIZE(buf));
2988
2989         rc = put_entry(buf, sizeof(u32), items, fp);
2990         if (rc)
2991                 return rc;
2992
2993         rc = put_entry(key, 1, len, fp);
2994         if (rc)
2995                 return rc;
2996
2997         rc = ebitmap_write(&role->dominates, fp);
2998         if (rc)
2999                 return rc;
3000
3001         rc = ebitmap_write(&role->types, fp);
3002         if (rc)
3003                 return rc;
3004
3005         return 0;
3006 }
3007
3008 static int type_write(void *vkey, void *datum, void *ptr)
3009 {
3010         char *key = vkey;
3011         struct type_datum *typdatum = datum;
3012         struct policy_data *pd = ptr;
3013         struct policydb *p = pd->p;
3014         void *fp = pd->fp;
3015         __le32 buf[4];
3016         int rc;
3017         size_t items, len;
3018
3019         len = strlen(key);
3020         items = 0;
3021         buf[items++] = cpu_to_le32(len);
3022         buf[items++] = cpu_to_le32(typdatum->value);
3023         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
3024                 u32 properties = 0;
3025
3026                 if (typdatum->primary)
3027                         properties |= TYPEDATUM_PROPERTY_PRIMARY;
3028
3029                 if (typdatum->attribute)
3030                         properties |= TYPEDATUM_PROPERTY_ATTRIBUTE;
3031
3032                 buf[items++] = cpu_to_le32(properties);
3033                 buf[items++] = cpu_to_le32(typdatum->bounds);
3034         } else {
3035                 buf[items++] = cpu_to_le32(typdatum->primary);
3036         }
3037         BUG_ON(items > ARRAY_SIZE(buf));
3038         rc = put_entry(buf, sizeof(u32), items, fp);
3039         if (rc)
3040                 return rc;
3041
3042         rc = put_entry(key, 1, len, fp);
3043         if (rc)
3044                 return rc;
3045
3046         return 0;
3047 }
3048
3049 static int user_write(void *vkey, void *datum, void *ptr)
3050 {
3051         char *key = vkey;
3052         struct user_datum *usrdatum = datum;
3053         struct policy_data *pd = ptr;
3054         struct policydb *p = pd->p;
3055         void *fp = pd->fp;
3056         __le32 buf[3];
3057         size_t items, len;
3058         int rc;
3059
3060         len = strlen(key);
3061         items = 0;
3062         buf[items++] = cpu_to_le32(len);
3063         buf[items++] = cpu_to_le32(usrdatum->value);
3064         if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
3065                 buf[items++] = cpu_to_le32(usrdatum->bounds);
3066         BUG_ON(items > ARRAY_SIZE(buf));
3067         rc = put_entry(buf, sizeof(u32), items, fp);
3068         if (rc)
3069                 return rc;
3070
3071         rc = put_entry(key, 1, len, fp);
3072         if (rc)
3073                 return rc;
3074
3075         rc = ebitmap_write(&usrdatum->roles, fp);
3076         if (rc)
3077                 return rc;
3078
3079         rc = mls_write_range_helper(&usrdatum->range, fp);
3080         if (rc)
3081                 return rc;
3082
3083         rc = mls_write_level(&usrdatum->dfltlevel, fp);
3084         if (rc)
3085                 return rc;
3086
3087         return 0;
3088 }
3089
3090 static int (*write_f[SYM_NUM]) (void *key, void *datum,
3091                                 void *datap) =
3092 {
3093         common_write,
3094         class_write,
3095         role_write,
3096         type_write,
3097         user_write,
3098         cond_write_bool,
3099         sens_write,
3100         cat_write,
3101 };
3102
3103 static int ocontext_write(struct policydb *p, struct policydb_compat_info *info,
3104                           void *fp)
3105 {
3106         unsigned int i, j, rc;
3107         size_t nel, len;
3108         __le32 buf[3];
3109         u32 nodebuf[8];
3110         struct ocontext *c;
3111         for (i = 0; i < info->ocon_num; i++) {
3112                 nel = 0;
3113                 for (c = p->ocontexts[i]; c; c = c->next)
3114                         nel++;
3115                 buf[0] = cpu_to_le32(nel);
3116                 rc = put_entry(buf, sizeof(u32), 1, fp);
3117                 if (rc)
3118                         return rc;
3119                 for (c = p->ocontexts[i]; c; c = c->next) {
3120                         switch (i) {
3121                         case OCON_ISID:
3122                                 buf[0] = cpu_to_le32(c->sid[0]);
3123                                 rc = put_entry(buf, sizeof(u32), 1, fp);
3124                                 if (rc)
3125                                         return rc;
3126                                 rc = context_write(p, &c->context[0], fp);
3127                                 if (rc)
3128                                         return rc;
3129                                 break;
3130                         case OCON_FS:
3131                         case OCON_NETIF:
3132                                 len = strlen(c->u.name);
3133                                 buf[0] = cpu_to_le32(len);
3134                                 rc = put_entry(buf, sizeof(u32), 1, fp);
3135                                 if (rc)
3136                                         return rc;
3137                                 rc = put_entry(c->u.name, 1, len, fp);
3138                                 if (rc)
3139                                         return rc;
3140                                 rc = context_write(p, &c->context[0], fp);
3141                                 if (rc)
3142                                         return rc;
3143                                 rc = context_write(p, &c->context[1], fp);
3144                                 if (rc)
3145                                         return rc;
3146                                 break;
3147                         case OCON_PORT:
3148                                 buf[0] = cpu_to_le32(c->u.port.protocol);
3149                                 buf[1] = cpu_to_le32(c->u.port.low_port);
3150                                 buf[2] = cpu_to_le32(c->u.port.high_port);
3151                                 rc = put_entry(buf, sizeof(u32), 3, fp);
3152                                 if (rc)
3153                                         return rc;
3154                                 rc = context_write(p, &c->context[0], fp);
3155                                 if (rc)
3156                                         return rc;
3157                                 break;
3158                         case OCON_NODE:
3159                                 nodebuf[0] = c->u.node.addr; /* network order */
3160                                 nodebuf[1] = c->u.node.mask; /* network order */
3161                                 rc = put_entry(nodebuf, sizeof(u32), 2, fp);
3162                                 if (rc)
3163                                         return rc;
3164                                 rc = context_write(p, &c->context[0], fp);
3165                                 if (rc)
3166                                         return rc;
3167                                 break;
3168                         case OCON_FSUSE:
3169                                 buf[0] = cpu_to_le32(c->v.behavior);
3170                                 len = strlen(c->u.name);
3171                                 buf[1] = cpu_to_le32(len);
3172                                 rc = put_entry(buf, sizeof(u32), 2, fp);
3173                                 if (rc)
3174                                         return rc;
3175                                 rc = put_entry(c->u.name, 1, len, fp);
3176                                 if (rc)
3177                                         return rc;
3178                                 rc = context_write(p, &c->context[0], fp);
3179                                 if (rc)
3180                                         return rc;
3181                                 break;
3182                         case OCON_NODE6:
3183                                 for (j = 0; j < 4; j++)
3184                                         nodebuf[j] = c->u.node6.addr[j]; /* network order */
3185                                 for (j = 0; j < 4; j++)
3186                                         nodebuf[j + 4] = c->u.node6.mask[j]; /* network order */
3187                                 rc = put_entry(nodebuf, sizeof(u32), 8, fp);
3188                                 if (rc)
3189                                         return rc;
3190                                 rc = context_write(p, &c->context[0], fp);
3191                                 if (rc)
3192                                         return rc;
3193                                 break;
3194                         case OCON_IBPKEY:
3195                                 *((__be64 *)nodebuf) = cpu_to_be64(c->u.ibpkey.subnet_prefix);
3196
3197                                 nodebuf[2] = cpu_to_le32(c->u.ibpkey.low_pkey);
3198                                 nodebuf[3] = cpu_to_le32(c->u.ibpkey.high_pkey);
3199
3200                                 rc = put_entry(nodebuf, sizeof(u32), 4, fp);
3201                                 if (rc)
3202                                         return rc;
3203                                 rc = context_write(p, &c->context[0], fp);
3204                                 if (rc)
3205                                         return rc;
3206                                 break;
3207                         case OCON_IBENDPORT:
3208                                 len = strlen(c->u.ibendport.dev_name);
3209                                 buf[0] = cpu_to_le32(len);
3210                                 buf[1] = cpu_to_le32(c->u.ibendport.port);
3211                                 rc = put_entry(buf, sizeof(u32), 2, fp);
3212                                 if (rc)
3213                                         return rc;
3214                                 rc = put_entry(c->u.ibendport.dev_name, 1, len, fp);
3215                                 if (rc)
3216                                         return rc;
3217                                 rc = context_write(p, &c->context[0], fp);
3218                                 if (rc)
3219                                         return rc;
3220                                 break;
3221                         }
3222                 }
3223         }
3224         return 0;
3225 }
3226
3227 static int genfs_write(struct policydb *p, void *fp)
3228 {
3229         struct genfs *genfs;
3230         struct ocontext *c;
3231         size_t len;
3232         __le32 buf[1];
3233         int rc;
3234
3235         len = 0;
3236         for (genfs = p->genfs; genfs; genfs = genfs->next)
3237                 len++;
3238         buf[0] = cpu_to_le32(len);
3239         rc = put_entry(buf, sizeof(u32), 1, fp);
3240         if (rc)
3241                 return rc;
3242         for (genfs = p->genfs; genfs; genfs = genfs->next) {
3243                 len = strlen(genfs->fstype);
3244                 buf[0] = cpu_to_le32(len);
3245                 rc = put_entry(buf, sizeof(u32), 1, fp);
3246                 if (rc)
3247                         return rc;
3248                 rc = put_entry(genfs->fstype, 1, len, fp);
3249                 if (rc)
3250                         return rc;
3251                 len = 0;
3252                 for (c = genfs->head; c; c = c->next)
3253                         len++;
3254                 buf[0] = cpu_to_le32(len);
3255                 rc = put_entry(buf, sizeof(u32), 1, fp);
3256                 if (rc)
3257                         return rc;
3258                 for (c = genfs->head; c; c = c->next) {
3259                         len = strlen(c->u.name);
3260                         buf[0] = cpu_to_le32(len);
3261                         rc = put_entry(buf, sizeof(u32), 1, fp);
3262                         if (rc)
3263                                 return rc;
3264                         rc = put_entry(c->u.name, 1, len, fp);
3265                         if (rc)
3266                                 return rc;
3267                         buf[0] = cpu_to_le32(c->v.sclass);
3268                         rc = put_entry(buf, sizeof(u32), 1, fp);
3269                         if (rc)
3270                                 return rc;
3271                         rc = context_write(p, &c->context[0], fp);
3272                         if (rc)
3273                                 return rc;
3274                 }
3275         }
3276         return 0;
3277 }
3278
3279 static int hashtab_cnt(void *key, void *data, void *ptr)
3280 {
3281         int *cnt = ptr;
3282         *cnt = *cnt + 1;
3283
3284         return 0;
3285 }
3286
3287 static int range_write_helper(void *key, void *data, void *ptr)
3288 {
3289         __le32 buf[2];
3290         struct range_trans *rt = key;
3291         struct mls_range *r = data;
3292         struct policy_data *pd = ptr;
3293         void *fp = pd->fp;
3294         struct policydb *p = pd->p;
3295         int rc;
3296
3297         buf[0] = cpu_to_le32(rt->source_type);
3298         buf[1] = cpu_to_le32(rt->target_type);
3299         rc = put_entry(buf, sizeof(u32), 2, fp);
3300         if (rc)
3301                 return rc;
3302         if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
3303                 buf[0] = cpu_to_le32(rt->target_class);
3304                 rc = put_entry(buf, sizeof(u32), 1, fp);
3305                 if (rc)
3306                         return rc;
3307         }
3308         rc = mls_write_range_helper(r, fp);
3309         if (rc)
3310                 return rc;
3311
3312         return 0;
3313 }
3314
3315 static int range_write(struct policydb *p, void *fp)
3316 {
3317         __le32 buf[1];
3318         int rc, nel;
3319         struct policy_data pd;
3320
3321         pd.p = p;
3322         pd.fp = fp;
3323
3324         /* count the number of entries in the hashtab */
3325         nel = 0;
3326         rc = hashtab_map(p->range_tr, hashtab_cnt, &nel);
3327         if (rc)
3328                 return rc;
3329
3330         buf[0] = cpu_to_le32(nel);
3331         rc = put_entry(buf, sizeof(u32), 1, fp);
3332         if (rc)
3333                 return rc;
3334
3335         /* actually write all of the entries */
3336         rc = hashtab_map(p->range_tr, range_write_helper, &pd);
3337         if (rc)
3338                 return rc;
3339
3340         return 0;
3341 }
3342
3343 static int filename_write_helper(void *key, void *data, void *ptr)
3344 {
3345         __le32 buf[4];
3346         struct filename_trans *ft = key;
3347         struct filename_trans_datum *otype = data;
3348         void *fp = ptr;
3349         int rc;
3350         u32 len;
3351
3352         len = strlen(ft->name);
3353         buf[0] = cpu_to_le32(len);
3354         rc = put_entry(buf, sizeof(u32), 1, fp);
3355         if (rc)
3356                 return rc;
3357
3358         rc = put_entry(ft->name, sizeof(char), len, fp);
3359         if (rc)
3360                 return rc;
3361
3362         buf[0] = cpu_to_le32(ft->stype);
3363         buf[1] = cpu_to_le32(ft->ttype);
3364         buf[2] = cpu_to_le32(ft->tclass);
3365         buf[3] = cpu_to_le32(otype->otype);
3366
3367         rc = put_entry(buf, sizeof(u32), 4, fp);
3368         if (rc)
3369                 return rc;
3370
3371         return 0;
3372 }
3373
3374 static int filename_trans_write(struct policydb *p, void *fp)
3375 {
3376         u32 nel;
3377         __le32 buf[1];
3378         int rc;
3379
3380         if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
3381                 return 0;
3382
3383         nel = 0;
3384         rc = hashtab_map(p->filename_trans, hashtab_cnt, &nel);
3385         if (rc)
3386                 return rc;
3387
3388         buf[0] = cpu_to_le32(nel);
3389         rc = put_entry(buf, sizeof(u32), 1, fp);
3390         if (rc)
3391                 return rc;
3392
3393         rc = hashtab_map(p->filename_trans, filename_write_helper, fp);
3394         if (rc)
3395                 return rc;
3396
3397         return 0;
3398 }
3399
3400 /*
3401  * Write the configuration data in a policy database
3402  * structure to a policy database binary representation
3403  * file.
3404  */
3405 int policydb_write(struct policydb *p, void *fp)
3406 {
3407         unsigned int i, num_syms;
3408         int rc;
3409         __le32 buf[4];
3410         u32 config;
3411         size_t len;
3412         struct policydb_compat_info *info;
3413
3414         /*
3415          * refuse to write policy older than compressed avtab
3416          * to simplify the writer.  There are other tests dropped
3417          * since we assume this throughout the writer code.  Be
3418          * careful if you ever try to remove this restriction
3419          */
3420         if (p->policyvers < POLICYDB_VERSION_AVTAB) {
3421                 pr_err("SELinux: refusing to write policy version %d."
3422                        "  Because it is less than version %d\n", p->policyvers,
3423                        POLICYDB_VERSION_AVTAB);
3424                 return -EINVAL;
3425         }
3426
3427         config = 0;
3428         if (p->mls_enabled)
3429                 config |= POLICYDB_CONFIG_MLS;
3430
3431         if (p->reject_unknown)
3432                 config |= REJECT_UNKNOWN;
3433         if (p->allow_unknown)
3434                 config |= ALLOW_UNKNOWN;
3435
3436         /* Write the magic number and string identifiers. */
3437         buf[0] = cpu_to_le32(POLICYDB_MAGIC);
3438         len = strlen(POLICYDB_STRING);
3439         buf[1] = cpu_to_le32(len);
3440         rc = put_entry(buf, sizeof(u32), 2, fp);
3441         if (rc)
3442                 return rc;
3443         rc = put_entry(POLICYDB_STRING, 1, len, fp);
3444         if (rc)
3445                 return rc;
3446
3447         /* Write the version, config, and table sizes. */
3448         info = policydb_lookup_compat(p->policyvers);
3449         if (!info) {
3450                 pr_err("SELinux: compatibility lookup failed for policy "
3451                     "version %d", p->policyvers);
3452                 return -EINVAL;
3453         }
3454
3455         buf[0] = cpu_to_le32(p->policyvers);
3456         buf[1] = cpu_to_le32(config);
3457         buf[2] = cpu_to_le32(info->sym_num);
3458         buf[3] = cpu_to_le32(info->ocon_num);
3459
3460         rc = put_entry(buf, sizeof(u32), 4, fp);
3461         if (rc)
3462                 return rc;
3463
3464         if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
3465                 rc = ebitmap_write(&p->policycaps, fp);
3466                 if (rc)
3467                         return rc;
3468         }
3469
3470         if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
3471                 rc = ebitmap_write(&p->permissive_map, fp);
3472                 if (rc)
3473                         return rc;
3474         }
3475
3476         num_syms = info->sym_num;
3477         for (i = 0; i < num_syms; i++) {
3478                 struct policy_data pd;
3479
3480                 pd.fp = fp;
3481                 pd.p = p;
3482
3483                 buf[0] = cpu_to_le32(p->symtab[i].nprim);
3484                 buf[1] = cpu_to_le32(p->symtab[i].table->nel);
3485
3486                 rc = put_entry(buf, sizeof(u32), 2, fp);
3487                 if (rc)
3488                         return rc;
3489                 rc = hashtab_map(p->symtab[i].table, write_f[i], &pd);
3490                 if (rc)
3491                         return rc;
3492         }
3493
3494         rc = avtab_write(p, &p->te_avtab, fp);
3495         if (rc)
3496                 return rc;
3497
3498         rc = cond_write_list(p, p->cond_list, fp);
3499         if (rc)
3500                 return rc;
3501
3502         rc = role_trans_write(p, fp);
3503         if (rc)
3504                 return rc;
3505
3506         rc = role_allow_write(p->role_allow, fp);
3507         if (rc)
3508                 return rc;
3509
3510         rc = filename_trans_write(p, fp);
3511         if (rc)
3512                 return rc;
3513
3514         rc = ocontext_write(p, info, fp);
3515         if (rc)
3516                 return rc;
3517
3518         rc = genfs_write(p, fp);
3519         if (rc)
3520                 return rc;
3521
3522         rc = range_write(p, fp);
3523         if (rc)
3524                 return rc;
3525
3526         for (i = 0; i < p->p_types.nprim; i++) {
3527                 struct ebitmap *e = flex_array_get(p->type_attr_map_array, i);
3528
3529                 BUG_ON(!e);
3530                 rc = ebitmap_write(e, fp);
3531                 if (rc)
3532                         return rc;
3533         }
3534
3535         return 0;
3536 }