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