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 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Implementation of the policy database.
  *
  * Author : Stephen Smalley, <sds@tycho.nsa.gov>
  */
 
 /*
  * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com>
  *
  *  Support for enhanced MLS infrastructure.
  *
  * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com>
  *
  *  Added conditional policy language extensions
  *
  * Updated: Hewlett-Packard <paul@paul-moore.com>
  *
  *      Added support for the policy capability bitmap
  *
  * Update: Mellanox Techonologies
  *
  *  Added Infiniband support
  *
  * Copyright (C) 2016 Mellanox Techonologies
  * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
  * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
  * Copyright (C) 2003 - 2004 Tresys Technology, LLC
  */
 
 #include <linux/kernel.h>
 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/string.h>
 #include <linux/errno.h>
 #include <linux/audit.h>
 #include "security.h"
 
 #include "policydb.h"
 #include "conditional.h"
 #include "mls.h"
 #include "services.h"
 
 #ifdef DEBUG_HASHES
 static const char *symtab_name[SYM_NUM] = {
     "common prefixes",
     "classes",
     "roles",
     "types",
     "users",
     "bools",
     "levels",
     "categories",
 };
 #endif
 
 struct policydb_compat_info {
     int version;
     int sym_num;
     int ocon_num;
 };
 
 /* These need to be updated if SYM_NUM or OCON_NUM changes */
 static const struct policydb_compat_info policydb_compat[] = {
     {
         .version    = POLICYDB_VERSION_BASE,
         .sym_num    = SYM_NUM - 3,
         .ocon_num   = OCON_NUM - 3,
     },
     {
         .version    = POLICYDB_VERSION_BOOL,
         .sym_num    = SYM_NUM - 2,
         .ocon_num   = OCON_NUM - 3,
     },
     {
         .version    = POLICYDB_VERSION_IPV6,
         .sym_num    = SYM_NUM - 2,
         .ocon_num   = OCON_NUM - 2,
     },
     {
         .version    = POLICYDB_VERSION_NLCLASS,
         .sym_num    = SYM_NUM - 2,
         .ocon_num   = OCON_NUM - 2,
     },
     {
         .version    = POLICYDB_VERSION_MLS,
         .sym_num    = SYM_NUM,
         .ocon_num   = OCON_NUM - 2,
     },
     {
         .version    = POLICYDB_VERSION_AVTAB,
         .sym_num    = SYM_NUM,
         .ocon_num   = OCON_NUM - 2,
     },
     {
         .version    = POLICYDB_VERSION_RANGETRANS,
         .sym_num    = SYM_NUM,
         .ocon_num   = OCON_NUM - 2,
     },
     {
         .version    = POLICYDB_VERSION_POLCAP,
         .sym_num    = SYM_NUM,
         .ocon_num   = OCON_NUM - 2,
     },
     {
         .version    = POLICYDB_VERSION_PERMISSIVE,
         .sym_num    = SYM_NUM,
         .ocon_num   = OCON_NUM - 2,
     },
     {
         .version    = POLICYDB_VERSION_BOUNDARY,
         .sym_num    = SYM_NUM,
         .ocon_num   = OCON_NUM - 2,
     },
     {
         .version    = POLICYDB_VERSION_FILENAME_TRANS,
         .sym_num    = SYM_NUM,
         .ocon_num   = OCON_NUM - 2,
     },
     {
         .version    = POLICYDB_VERSION_ROLETRANS,
         .sym_num    = SYM_NUM,
         .ocon_num   = OCON_NUM - 2,
     },
     {
         .version    = POLICYDB_VERSION_NEW_OBJECT_DEFAULTS,
         .sym_num    = SYM_NUM,
         .ocon_num   = OCON_NUM - 2,
     },
     {
         .version    = POLICYDB_VERSION_DEFAULT_TYPE,
         .sym_num    = SYM_NUM,
         .ocon_num   = OCON_NUM - 2,
     },
     {
         .version    = POLICYDB_VERSION_CONSTRAINT_NAMES,
         .sym_num    = SYM_NUM,
         .ocon_num   = OCON_NUM - 2,
     },
     {
         .version    = POLICYDB_VERSION_XPERMS_IOCTL,
         .sym_num    = SYM_NUM,
         .ocon_num   = OCON_NUM - 2,
     },
     {
         .version    = POLICYDB_VERSION_INFINIBAND,
         .sym_num    = SYM_NUM,
         .ocon_num   = OCON_NUM,
     },
     {
         .version    = POLICYDB_VERSION_GLBLUB,
         .sym_num    = SYM_NUM,
         .ocon_num   = OCON_NUM,
     },
     {
         .version    = POLICYDB_VERSION_COMP_FTRANS,
         .sym_num    = SYM_NUM,
         .ocon_num   = OCON_NUM,
     },
 };
 
 static const struct policydb_compat_info *policydb_lookup_compat(int version)
 {
     int i;
 
     for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) {
         if (policydb_compat[i].version == version)
             return &policydb_compat[i];
     }
 
     return NULL;
 }
 
 /*
  * The following *_destroy functions are used to
  * free any memory allocated for each kind of
  * symbol data in the policy database.
  */
 
 static int perm_destroy(void *key, void *datum, void *p)
 {
     kfree(key);
     kfree(datum);
     return 0;
 }
 
 static int common_destroy(void *key, void *datum, void *p)
 {
     struct common_datum *comdatum;
 
     kfree(key);
     if (datum) {
         comdatum = datum;
         hashtab_map(&comdatum->permissions.table, perm_destroy, NULL);
         hashtab_destroy(&comdatum->permissions.table);
     }
     kfree(datum);
     return 0;
 }
 
 static void constraint_expr_destroy(struct constraint_expr *expr)
 {
     if (expr) {
         ebitmap_destroy(&expr->names);
         if (expr->type_names) {
             ebitmap_destroy(&expr->type_names->types);
             ebitmap_destroy(&expr->type_names->negset);
             kfree(expr->type_names);
         }
         kfree(expr);
     }
 }
 
 static int cls_destroy(void *key, void *datum, void *p)
 {
     struct class_datum *cladatum;
     struct constraint_node *constraint, *ctemp;
     struct constraint_expr *e, *etmp;
 
     kfree(key);
     if (datum) {
         cladatum = datum;
         hashtab_map(&cladatum->permissions.table, perm_destroy, NULL);
         hashtab_destroy(&cladatum->permissions.table);
         constraint = cladatum->constraints;
         while (constraint) {
             e = constraint->expr;
             while (e) {
                 etmp = e;
                 e = e->next;
                 constraint_expr_destroy(etmp);
             }
             ctemp = constraint;
             constraint = constraint->next;
             kfree(ctemp);
         }
 
         constraint = cladatum->validatetrans;
         while (constraint) {
             e = constraint->expr;
             while (e) {
                 etmp = e;
                 e = e->next;
                 constraint_expr_destroy(etmp);
             }
             ctemp = constraint;
             constraint = constraint->next;
             kfree(ctemp);
         }
         kfree(cladatum->comkey);
     }
     kfree(datum);
     return 0;
 }
 
 static int role_destroy(void *key, void *datum, void *p)
 {
     struct role_datum *role;
 
     kfree(key);
     if (datum) {
         role = datum;
         ebitmap_destroy(&role->dominates);
         ebitmap_destroy(&role->types);
     }
     kfree(datum);
     return 0;
 }
 
 static int type_destroy(void *key, void *datum, void *p)
 {
     kfree(key);
     kfree(datum);
     return 0;
 }
 
 static int user_destroy(void *key, void *datum, void *p)
 {
     struct user_datum *usrdatum;
 
     kfree(key);
     if (datum) {
         usrdatum = datum;
         ebitmap_destroy(&usrdatum->roles);
         ebitmap_destroy(&usrdatum->range.level[0].cat);
         ebitmap_destroy(&usrdatum->range.level[1].cat);
         ebitmap_destroy(&usrdatum->dfltlevel.cat);
     }
     kfree(datum);
     return 0;
 }
 
 static int sens_destroy(void *key, void *datum, void *p)
 {
     struct level_datum *levdatum;
 
     kfree(key);
     if (datum) {
         levdatum = datum;
         if (levdatum->level)
             ebitmap_destroy(&levdatum->level->cat);
         kfree(levdatum->level);
     }
     kfree(datum);
     return 0;
 }
 
 static int cat_destroy(void *key, void *datum, void *p)
 {
     kfree(key);
     kfree(datum);
     return 0;
 }
 
 static int (*const destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) = {
     common_destroy,
     cls_destroy,
     role_destroy,
     type_destroy,
     user_destroy,
     cond_destroy_bool,
     sens_destroy,
     cat_destroy,
 };
 
 static int filenametr_destroy(void *key, void *datum, void *p)
 {
     struct filename_trans_key *ft = key;
     struct filename_trans_datum *next, *d = datum;
 
     kfree(ft->name);
     kfree(key);
     do {
         ebitmap_destroy(&d->stypes);
         next = d->next;
         kfree(d);
         d = next;
     } while (unlikely(d));
     cond_resched();
     return 0;
 }
 
 static int range_tr_destroy(void *key, void *datum, void *p)
 {
     struct mls_range *rt = datum;
 
     kfree(key);
     ebitmap_destroy(&rt->level[0].cat);
     ebitmap_destroy(&rt->level[1].cat);
     kfree(datum);
     cond_resched();
     return 0;
 }
 
 static int role_tr_destroy(void *key, void *datum, void *p)
 {
     kfree(key);
     kfree(datum);
     return 0;
 }
 
 static void ocontext_destroy(struct ocontext *c, int i)
 {
     if (!c)
         return;
 
     context_destroy(&c->context[0]);
     context_destroy(&c->context[1]);
     if (i == OCON_ISID || i == OCON_FS ||
         i == OCON_NETIF || i == OCON_FSUSE)
         kfree(c->u.name);
     kfree(c);
 }
 
 /*
  * Initialize the role table.
  */
 static int roles_init(struct policydb *p)
 {
     char *key = NULL;
     int rc;
     struct role_datum *role;
 
     role = kzalloc(sizeof(*role), GFP_KERNEL);
     if (!role)
         return -ENOMEM;
 
     rc = -EINVAL;
     role->value = ++p->p_roles.nprim;
     if (role->value != OBJECT_R_VAL)
         goto out;
 
     rc = -ENOMEM;
     key = kstrdup(OBJECT_R, GFP_KERNEL);
     if (!key)
         goto out;
 
     rc = symtab_insert(&p->p_roles, key, role);
     if (rc)
         goto out;
 
     return 0;
 out:
     kfree(key);
     kfree(role);
     return rc;
 }
 
 static u32 filenametr_hash(const void *k)
 {
     const struct filename_trans_key *ft = k;
     unsigned long hash;
     unsigned int byte_num;
     unsigned char focus;
 
     hash = ft->ttype ^ ft->tclass;
 
     byte_num = 0;
     while ((focus = ft->name[byte_num++]))
         hash = partial_name_hash(focus, hash);
     return hash;
 }
 
 static int filenametr_cmp(const void *k1, const void *k2)
 {
     const struct filename_trans_key *ft1 = k1;
     const struct filename_trans_key *ft2 = k2;
     int v;
 
     v = ft1->ttype - ft2->ttype;
     if (v)
         return v;
 
     v = ft1->tclass - ft2->tclass;
     if (v)
         return v;
 
     return strcmp(ft1->name, ft2->name);
 
 }
 
 static const struct hashtab_key_params filenametr_key_params = {
     .hash = filenametr_hash,
     .cmp = filenametr_cmp,
 };
 
 struct filename_trans_datum *policydb_filenametr_search(
     struct policydb *p, struct filename_trans_key *key)
 {
     return hashtab_search(&p->filename_trans, key, filenametr_key_params);
 }
 
 static u32 rangetr_hash(const void *k)
 {
     const struct range_trans *key = k;
 
     return key->source_type + (key->target_type << 3) +
         (key->target_class << 5);
 }
 
 static int rangetr_cmp(const void *k1, const void *k2)
 {
     const struct range_trans *key1 = k1, *key2 = k2;
     int v;
 
     v = key1->source_type - key2->source_type;
     if (v)
         return v;
 
     v = key1->target_type - key2->target_type;
     if (v)
         return v;
 
     v = key1->target_class - key2->target_class;
 
     return v;
 }
 
 static const struct hashtab_key_params rangetr_key_params = {
     .hash = rangetr_hash,
     .cmp = rangetr_cmp,
 };
 
 struct mls_range *policydb_rangetr_search(struct policydb *p,
                       struct range_trans *key)
 {
     return hashtab_search(&p->range_tr, key, rangetr_key_params);
 }
 
 static u32 role_trans_hash(const void *k)
 {
     const struct role_trans_key *key = k;
 
     return key->role + (key->type << 3) + (key->tclass << 5);
 }
 
 static int role_trans_cmp(const void *k1, const void *k2)
 {
     const struct role_trans_key *key1 = k1, *key2 = k2;
     int v;
 
     v = key1->role - key2->role;
     if (v)
         return v;
 
     v = key1->type - key2->type;
     if (v)
         return v;
 
     return key1->tclass - key2->tclass;
 }
 
 static const struct hashtab_key_params roletr_key_params = {
     .hash = role_trans_hash,
     .cmp = role_trans_cmp,
 };
 
 struct role_trans_datum *policydb_roletr_search(struct policydb *p,
                         struct role_trans_key *key)
 {
     return hashtab_search(&p->role_tr, key, roletr_key_params);
 }
 
 /*
  * Initialize a policy database structure.
  */
 static void policydb_init(struct policydb *p)
 {
     memset(p, 0, sizeof(*p));
 
     avtab_init(&p->te_avtab);
     cond_policydb_init(p);
 
     ebitmap_init(&p->filename_trans_ttypes);
     ebitmap_init(&p->policycaps);
     ebitmap_init(&p->permissive_map);
 }
 
 /*
  * The following *_index functions are used to
  * define the val_to_name and val_to_struct arrays
  * in a policy database structure.  The val_to_name
  * arrays are used when converting security context
  * structures into string representations.  The
  * val_to_struct arrays are used when the attributes
  * of a class, role, or user are needed.
  */
 
 static int common_index(void *key, void *datum, void *datap)
 {
     struct policydb *p;
     struct common_datum *comdatum;
 
     comdatum = datum;
     p = datap;
     if (!comdatum->value || comdatum->value > p->p_commons.nprim)
         return -EINVAL;
 
     p->sym_val_to_name[SYM_COMMONS][comdatum->value - 1] = key;
 
     return 0;
 }
 
 static int class_index(void *key, void *datum, void *datap)
 {
     struct policydb *p;
     struct class_datum *cladatum;
 
     cladatum = datum;
     p = datap;
     if (!cladatum->value || cladatum->value > p->p_classes.nprim)
         return -EINVAL;
 
     p->sym_val_to_name[SYM_CLASSES][cladatum->value - 1] = key;
     p->class_val_to_struct[cladatum->value - 1] = cladatum;
     return 0;
 }
 
 static int role_index(void *key, void *datum, void *datap)
 {
     struct policydb *p;
     struct role_datum *role;
 
     role = datum;
     p = datap;
     if (!role->value
         || role->value > p->p_roles.nprim
         || role->bounds > p->p_roles.nprim)
         return -EINVAL;
 
     p->sym_val_to_name[SYM_ROLES][role->value - 1] = key;
     p->role_val_to_struct[role->value - 1] = role;
     return 0;
 }
 
 static int type_index(void *key, void *datum, void *datap)
 {
     struct policydb *p;
     struct type_datum *typdatum;
 
     typdatum = datum;
     p = datap;
 
     if (typdatum->primary) {
         if (!typdatum->value
             || typdatum->value > p->p_types.nprim
             || typdatum->bounds > p->p_types.nprim)
             return -EINVAL;
         p->sym_val_to_name[SYM_TYPES][typdatum->value - 1] = key;
         p->type_val_to_struct[typdatum->value - 1] = typdatum;
     }
 
     return 0;
 }
 
 static int user_index(void *key, void *datum, void *datap)
 {
     struct policydb *p;
     struct user_datum *usrdatum;
 
     usrdatum = datum;
     p = datap;
     if (!usrdatum->value
         || usrdatum->value > p->p_users.nprim
         || usrdatum->bounds > p->p_users.nprim)
         return -EINVAL;
 
     p->sym_val_to_name[SYM_USERS][usrdatum->value - 1] = key;
     p->user_val_to_struct[usrdatum->value - 1] = usrdatum;
     return 0;
 }
 
 static int sens_index(void *key, void *datum, void *datap)
 {
     struct policydb *p;
     struct level_datum *levdatum;
 
     levdatum = datum;
     p = datap;
 
     if (!levdatum->isalias) {
         if (!levdatum->level->sens ||
             levdatum->level->sens > p->p_levels.nprim)
             return -EINVAL;
 
         p->sym_val_to_name[SYM_LEVELS][levdatum->level->sens - 1] = key;
     }
 
     return 0;
 }
 
 static int cat_index(void *key, void *datum, void *datap)
 {
     struct policydb *p;
     struct cat_datum *catdatum;
 
     catdatum = datum;
     p = datap;
 
     if (!catdatum->isalias) {
         if (!catdatum->value || catdatum->value > p->p_cats.nprim)
             return -EINVAL;
 
         p->sym_val_to_name[SYM_CATS][catdatum->value - 1] = key;
     }
 
     return 0;
 }
 
 static int (*const index_f[SYM_NUM]) (void *key, void *datum, void *datap) = {
     common_index,
     class_index,
     role_index,
     type_index,
     user_index,
     cond_index_bool,
     sens_index,
     cat_index,
 };
 
 #ifdef DEBUG_HASHES
 static void hash_eval(struct hashtab *h, const char *hash_name)
 {
     struct hashtab_info info;
 
     hashtab_stat(h, &info);
     pr_debug("SELinux: %s:  %d entries and %d/%d buckets used, longest chain length %d\n",
          hash_name, h->nel, info.slots_used, h->size,
          info.max_chain_len);
 }
 
 static void symtab_hash_eval(struct symtab *s)
 {
     int i;
 
     for (i = 0; i < SYM_NUM; i++)
         hash_eval(&s[i].table, symtab_name[i]);
 }
 
 #else
 static inline void hash_eval(struct hashtab *h, const char *hash_name)
 {
 }
 #endif
 
 /*
  * Define the other val_to_name and val_to_struct arrays
  * in a policy database structure.
  *
  * Caller must clean up on failure.
  */
 static int policydb_index(struct policydb *p)
 {
     int i, rc;
 
     if (p->mls_enabled)
         pr_debug("SELinux:  %d users, %d roles, %d types, %d bools, %d sens, %d cats\n",
              p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim,
              p->p_bools.nprim, p->p_levels.nprim, p->p_cats.nprim);
     else
         pr_debug("SELinux:  %d users, %d roles, %d types, %d bools\n",
              p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim,
              p->p_bools.nprim);
 
     pr_debug("SELinux:  %d classes, %d rules\n",
          p->p_classes.nprim, p->te_avtab.nel);
 
 #ifdef DEBUG_HASHES
     avtab_hash_eval(&p->te_avtab, "rules");
     symtab_hash_eval(p->symtab);
 #endif
 
     p->class_val_to_struct = kcalloc(p->p_classes.nprim,
                      sizeof(*p->class_val_to_struct),
                      GFP_KERNEL);
     if (!p->class_val_to_struct)
         return -ENOMEM;
 
     p->role_val_to_struct = kcalloc(p->p_roles.nprim,
                     sizeof(*p->role_val_to_struct),
                     GFP_KERNEL);
     if (!p->role_val_to_struct)
         return -ENOMEM;
 
     p->user_val_to_struct = kcalloc(p->p_users.nprim,
                     sizeof(*p->user_val_to_struct),
                     GFP_KERNEL);
     if (!p->user_val_to_struct)
         return -ENOMEM;
 
     p->type_val_to_struct = kvcalloc(p->p_types.nprim,
                      sizeof(*p->type_val_to_struct),
                      GFP_KERNEL);
     if (!p->type_val_to_struct)
         return -ENOMEM;
 
     rc = cond_init_bool_indexes(p);
     if (rc)
         goto out;
 
     for (i = 0; i < SYM_NUM; i++) {
         p->sym_val_to_name[i] = kvcalloc(p->symtab[i].nprim,
                          sizeof(char *),
                          GFP_KERNEL);
         if (!p->sym_val_to_name[i])
             return -ENOMEM;
 
         rc = hashtab_map(&p->symtab[i].table, index_f[i], p);
         if (rc)
             goto out;
     }
     rc = 0;
 out:
     return rc;
 }
 
 /*
  * Free any memory allocated by a policy database structure.
  */
 void policydb_destroy(struct policydb *p)
 {
     struct ocontext *c, *ctmp;
     struct genfs *g, *gtmp;
     int i;
     struct role_allow *ra, *lra = NULL;
 
     for (i = 0; i < SYM_NUM; i++) {
         cond_resched();
         hashtab_map(&p->symtab[i].table, destroy_f[i], NULL);
         hashtab_destroy(&p->symtab[i].table);
     }
 
     for (i = 0; i < SYM_NUM; i++)
         kvfree(p->sym_val_to_name[i]);
 
     kfree(p->class_val_to_struct);
     kfree(p->role_val_to_struct);
     kfree(p->user_val_to_struct);
     kvfree(p->type_val_to_struct);
 
     avtab_destroy(&p->te_avtab);
 
     for (i = 0; i < OCON_NUM; i++) {
         cond_resched();
         c = p->ocontexts[i];
         while (c) {
             ctmp = c;
             c = c->next;
             ocontext_destroy(ctmp, i);
         }
         p->ocontexts[i] = NULL;
     }
 
     g = p->genfs;
     while (g) {
         cond_resched();
         kfree(g->fstype);
         c = g->head;
         while (c) {
             ctmp = c;
             c = c->next;
             ocontext_destroy(ctmp, OCON_FSUSE);
         }
         gtmp = g;
         g = g->next;
         kfree(gtmp);
     }
     p->genfs = NULL;
 
     cond_policydb_destroy(p);
 
     hashtab_map(&p->role_tr, role_tr_destroy, NULL);
     hashtab_destroy(&p->role_tr);
 
     for (ra = p->role_allow; ra; ra = ra->next) {
         cond_resched();
         kfree(lra);
         lra = ra;
     }
     kfree(lra);
 
     hashtab_map(&p->filename_trans, filenametr_destroy, NULL);
     hashtab_destroy(&p->filename_trans);
 
     hashtab_map(&p->range_tr, range_tr_destroy, NULL);
     hashtab_destroy(&p->range_tr);
 
     if (p->type_attr_map_array) {
         for (i = 0; i < p->p_types.nprim; i++)
             ebitmap_destroy(&p->type_attr_map_array[i]);
         kvfree(p->type_attr_map_array);
     }
 
     ebitmap_destroy(&p->filename_trans_ttypes);
     ebitmap_destroy(&p->policycaps);
     ebitmap_destroy(&p->permissive_map);
 }
 
 /*
  * Load the initial SIDs specified in a policy database
  * structure into a SID table.
  */
 int policydb_load_isids(struct policydb *p, struct sidtab *s)
 {
     struct ocontext *head, *c;
     int rc;
 
     rc = sidtab_init(s);
     if (rc) {
         pr_err("SELinux:  out of memory on SID table init\n");
         return rc;
     }
 
     head = p->ocontexts[OCON_ISID];
     for (c = head; c; c = c->next) {
         u32 sid = c->sid[0];
         const char *name = security_get_initial_sid_context(sid);
 
         if (sid == SECSID_NULL) {
             pr_err("SELinux:  SID 0 was assigned a context.\n");
             sidtab_destroy(s);
             return -EINVAL;
         }
 
         /* Ignore initial SIDs unused by this kernel. */
         if (!name)
             continue;
 
         rc = sidtab_set_initial(s, sid, &c->context[0]);
         if (rc) {
             pr_err("SELinux:  unable to load initial SID %s.\n",
                    name);
             sidtab_destroy(s);
             return rc;
         }
     }
     return 0;
 }
 
 int policydb_class_isvalid(struct policydb *p, unsigned int class)
 {
     if (!class || class > p->p_classes.nprim)
         return 0;
     return 1;
 }
 
 int policydb_role_isvalid(struct policydb *p, unsigned int role)
 {
     if (!role || role > p->p_roles.nprim)
         return 0;
     return 1;
 }
 
 int policydb_type_isvalid(struct policydb *p, unsigned int type)
 {
     if (!type || type > p->p_types.nprim)
         return 0;
     return 1;
 }
 
 /*
  * Return 1 if the fields in the security context
  * structure `c' are valid.  Return 0 otherwise.
  */
 int policydb_context_isvalid(struct policydb *p, struct context *c)
 {
     struct role_datum *role;
     struct user_datum *usrdatum;
 
     if (!c->role || c->role > p->p_roles.nprim)
         return 0;
 
     if (!c->user || c->user > p->p_users.nprim)
         return 0;
 
     if (!c->type || c->type > p->p_types.nprim)
         return 0;
 
     if (c->role != OBJECT_R_VAL) {
         /*
          * Role must be authorized for the type.
          */
         role = p->role_val_to_struct[c->role - 1];
         if (!role || !ebitmap_get_bit(&role->types, c->type - 1))
             /* role may not be associated with type */
             return 0;
 
         /*
          * User must be authorized for the role.
          */
         usrdatum = p->user_val_to_struct[c->user - 1];
         if (!usrdatum)
             return 0;
 
         if (!ebitmap_get_bit(&usrdatum->roles, c->role - 1))
             /* user may not be associated with role */
             return 0;
     }
 
     if (!mls_context_isvalid(p, c))
         return 0;
 
     return 1;
 }
 
 /*
  * Read a MLS range structure from a policydb binary
  * representation file.
  */
 static int mls_read_range_helper(struct mls_range *r, void *fp)
 {
     __le32 buf[2];
     u32 items;
     int rc;
 
     rc = next_entry(buf, fp, sizeof(u32));
     if (rc)
         goto out;
 
     rc = -EINVAL;
     items = le32_to_cpu(buf[0]);
     if (items > ARRAY_SIZE(buf)) {
         pr_err("SELinux: mls:  range overflow\n");
         goto out;
     }
 
     rc = next_entry(buf, fp, sizeof(u32) * items);
     if (rc) {
         pr_err("SELinux: mls:  truncated range\n");
         goto out;
     }
 
     r->level[0].sens = le32_to_cpu(buf[0]);
     if (items > 1)
         r->level[1].sens = le32_to_cpu(buf[1]);
     else
         r->level[1].sens = r->level[0].sens;
 
     rc = ebitmap_read(&r->level[0].cat, fp);
     if (rc) {
         pr_err("SELinux: mls:  error reading low categories\n");
         goto out;
     }
     if (items > 1) {
         rc = ebitmap_read(&r->level[1].cat, fp);
         if (rc) {
             pr_err("SELinux: mls:  error reading high categories\n");
             goto bad_high;
         }
     } else {
         rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat);
         if (rc) {
             pr_err("SELinux: mls:  out of memory\n");
             goto bad_high;
         }
     }
 
     return 0;
 bad_high:
     ebitmap_destroy(&r->level[0].cat);
 out:
     return rc;
 }
 
 /*
  * Read and validate a security context structure
  * from a policydb binary representation file.
  */
 static int context_read_and_validate(struct context *c,
                      struct policydb *p,
                      void *fp)
 {
     __le32 buf[3];
     int rc;
 
     rc = next_entry(buf, fp, sizeof buf);
     if (rc) {
         pr_err("SELinux: context truncated\n");
         goto out;
     }
     c->user = le32_to_cpu(buf[0]);
     c->role = le32_to_cpu(buf[1]);
     c->type = le32_to_cpu(buf[2]);
     if (p->policyvers >= POLICYDB_VERSION_MLS) {
         rc = mls_read_range_helper(&c->range, fp);
         if (rc) {
             pr_err("SELinux: error reading MLS range of context\n");
             goto out;
         }
     }
 
     rc = -EINVAL;
     if (!policydb_context_isvalid(p, c)) {
         pr_err("SELinux:  invalid security context\n");
         context_destroy(c);
         goto out;
     }
     rc = 0;
 out:
     return rc;
 }
 
 /*
  * The following *_read functions are used to
  * read the symbol data from a policy database
  * binary representation file.
  */
 
 static int str_read(char **strp, gfp_t flags, void *fp, u32 len)
 {
     int rc;
     char *str;
 
     if ((len == 0) || (len == (u32)-1))
         return -EINVAL;
 
     str = kmalloc(len + 1, flags | __GFP_NOWARN);
     if (!str)
         return -ENOMEM;
 
     rc = next_entry(str, fp, len);
     if (rc) {
         kfree(str);
         return rc;
     }
 
     str[len] = '\0';
     *strp = str;
     return 0;
 }
 
 static int perm_read(struct policydb *p, struct symtab *s, void *fp)
 {
     char *key = NULL;
     struct perm_datum *perdatum;
     int rc;
     __le32 buf[2];
     u32 len;
 
     perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
     if (!perdatum)
         return -ENOMEM;
 
     rc = next_entry(buf, fp, sizeof buf);
     if (rc)
         goto bad;
 
     len = le32_to_cpu(buf[0]);
     perdatum->value = le32_to_cpu(buf[1]);
 
     rc = str_read(&key, GFP_KERNEL, fp, len);
     if (rc)
         goto bad;
 
     rc = symtab_insert(s, key, perdatum);
     if (rc)
         goto bad;
 
     return 0;
 bad:
     perm_destroy(key, perdatum, NULL);
     return rc;
 }
 
 static int common_read(struct policydb *p, struct symtab *s, void *fp)
 {
     char *key = NULL;
     struct common_datum *comdatum;
     __le32 buf[4];
     u32 len, nel;
     int i, rc;
 
     comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
     if (!comdatum)
         return -ENOMEM;
 
     rc = next_entry(buf, fp, sizeof buf);
     if (rc)
         goto bad;
 
     len = le32_to_cpu(buf[0]);
     comdatum->value = le32_to_cpu(buf[1]);
     nel = le32_to_cpu(buf[3]);
 
     rc = symtab_init(&comdatum->permissions, nel);
     if (rc)
         goto bad;
     comdatum->permissions.nprim = le32_to_cpu(buf[2]);
 
     rc = str_read(&key, GFP_KERNEL, fp, len);
     if (rc)
         goto bad;
 
     for (i = 0; i < nel; i++) {
         rc = perm_read(p, &comdatum->permissions, fp);
         if (rc)
             goto bad;
     }
 
     rc = symtab_insert(s, key, comdatum);
     if (rc)
         goto bad;
     return 0;
 bad:
     common_destroy(key, comdatum, NULL);
     return rc;
 }
 
 static void type_set_init(struct type_set *t)
 {
     ebitmap_init(&t->types);
     ebitmap_init(&t->negset);
 }
 
 static int type_set_read(struct type_set *t, void *fp)
 {
     __le32 buf[1];
     int rc;
 
     if (ebitmap_read(&t->types, fp))
         return -EINVAL;
     if (ebitmap_read(&t->negset, fp))
         return -EINVAL;
 
     rc = next_entry(buf, fp, sizeof(u32));
     if (rc < 0)
         return -EINVAL;
     t->flags = le32_to_cpu(buf[0]);
 
     return 0;
 }
 
 
 static int read_cons_helper(struct policydb *p,
                 struct constraint_node **nodep,
                 int ncons, int allowxtarget, void *fp)
 {
     struct constraint_node *c, *lc;
     struct constraint_expr *e, *le;
     __le32 buf[3];
     u32 nexpr;
     int rc, i, j, depth;
 
     lc = NULL;
     for (i = 0; i < ncons; i++) {
         c = kzalloc(sizeof(*c), GFP_KERNEL);
         if (!c)
             return -ENOMEM;
 
         if (lc)
             lc->next = c;
         else
             *nodep = c;
 
         rc = next_entry(buf, fp, (sizeof(u32) * 2));
         if (rc)
             return rc;
         c->permissions = le32_to_cpu(buf[0]);
         nexpr = le32_to_cpu(buf[1]);
         le = NULL;
         depth = -1;
         for (j = 0; j < nexpr; j++) {
             e = kzalloc(sizeof(*e), GFP_KERNEL);
             if (!e)
                 return -ENOMEM;
 
             if (le)
                 le->next = e;
             else
                 c->expr = e;
 
             rc = next_entry(buf, fp, (sizeof(u32) * 3));
             if (rc)
                 return rc;
             e->expr_type = le32_to_cpu(buf[0]);
             e->attr = le32_to_cpu(buf[1]);
             e->op = le32_to_cpu(buf[2]);
 
             switch (e->expr_type) {
             case CEXPR_NOT:
                 if (depth < 0)
                     return -EINVAL;
                 break;
             case CEXPR_AND:
             case CEXPR_OR:
                 if (depth < 1)
                     return -EINVAL;
                 depth--;
                 break;
             case CEXPR_ATTR:
                 if (depth == (CEXPR_MAXDEPTH - 1))
                     return -EINVAL;
                 depth++;
                 break;
             case CEXPR_NAMES:
                 if (!allowxtarget && (e->attr & CEXPR_XTARGET))
                     return -EINVAL;
                 if (depth == (CEXPR_MAXDEPTH - 1))
                     return -EINVAL;
                 depth++;
                 rc = ebitmap_read(&e->names, fp);
                 if (rc)
                     return rc;
                 if (p->policyvers >=
                     POLICYDB_VERSION_CONSTRAINT_NAMES) {
                     e->type_names = kzalloc(sizeof
                         (*e->type_names), GFP_KERNEL);
                     if (!e->type_names)
                         return -ENOMEM;
                     type_set_init(e->type_names);
                     rc = type_set_read(e->type_names, fp);
                     if (rc)
                         return rc;
                 }
                 break;
             default:
                 return -EINVAL;
             }
             le = e;
         }
         if (depth != 0)
             return -EINVAL;
         lc = c;
     }
 
     return 0;
 }
 
 static int class_read(struct policydb *p, struct symtab *s, void *fp)
 {
     char *key = NULL;
     struct class_datum *cladatum;
     __le32 buf[6];
     u32 len, len2, ncons, nel;
     int i, rc;
 
     cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
     if (!cladatum)
         return -ENOMEM;
 
     rc = next_entry(buf, fp, sizeof(u32)*6);
     if (rc)
         goto bad;
 
     len = le32_to_cpu(buf[0]);
     len2 = le32_to_cpu(buf[1]);
     cladatum->value = le32_to_cpu(buf[2]);
     nel = le32_to_cpu(buf[4]);
 
     rc = symtab_init(&cladatum->permissions, nel);
     if (rc)
         goto bad;
     cladatum->permissions.nprim = le32_to_cpu(buf[3]);
 
     ncons = le32_to_cpu(buf[5]);
 
     rc = str_read(&key, GFP_KERNEL, fp, len);
     if (rc)
         goto bad;
 
     if (len2) {
         rc = str_read(&cladatum->comkey, GFP_KERNEL, fp, len2);
         if (rc)
             goto bad;
 
         rc = -EINVAL;
         cladatum->comdatum = symtab_search(&p->p_commons,
                            cladatum->comkey);
         if (!cladatum->comdatum) {
             pr_err("SELinux:  unknown common %s\n",
                    cladatum->comkey);
             goto bad;
         }
     }
     for (i = 0; i < nel; i++) {
         rc = perm_read(p, &cladatum->permissions, fp);
         if (rc)
             goto bad;
     }
 
     rc = read_cons_helper(p, &cladatum->constraints, ncons, 0, fp);
     if (rc)
         goto bad;
 
     if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
         /* grab the validatetrans rules */
         rc = next_entry(buf, fp, sizeof(u32));
         if (rc)
             goto bad;
         ncons = le32_to_cpu(buf[0]);
         rc = read_cons_helper(p, &cladatum->validatetrans,
                 ncons, 1, fp);
         if (rc)
             goto bad;
     }
 
     if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
         rc = next_entry(buf, fp, sizeof(u32) * 3);
         if (rc)
             goto bad;
 
         cladatum->default_user = le32_to_cpu(buf[0]);
         cladatum->default_role = le32_to_cpu(buf[1]);
         cladatum->default_range = le32_to_cpu(buf[2]);
     }
 
     if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
         rc = next_entry(buf, fp, sizeof(u32) * 1);
         if (rc)
             goto bad;
         cladatum->default_type = le32_to_cpu(buf[0]);
     }
 
     rc = symtab_insert(s, key, cladatum);
     if (rc)
         goto bad;
 
     return 0;
 bad:
     cls_destroy(key, cladatum, NULL);
     return rc;
 }
 
 static int role_read(struct policydb *p, struct symtab *s, void *fp)
 {
     char *key = NULL;
     struct role_datum *role;
     int rc, to_read = 2;
     __le32 buf[3];
     u32 len;
 
     role = kzalloc(sizeof(*role), GFP_KERNEL);
     if (!role)
         return -ENOMEM;
 
     if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
         to_read = 3;
 
     rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
     if (rc)
         goto bad;
 
     len = le32_to_cpu(buf[0]);
     role->value = le32_to_cpu(buf[1]);
     if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
         role->bounds = le32_to_cpu(buf[2]);
 
     rc = str_read(&key, GFP_KERNEL, fp, len);
     if (rc)
         goto bad;
 
     rc = ebitmap_read(&role->dominates, fp);
     if (rc)
         goto bad;
 
     rc = ebitmap_read(&role->types, fp);
     if (rc)
         goto bad;
 
     if (strcmp(key, OBJECT_R) == 0) {
         rc = -EINVAL;
         if (role->value != OBJECT_R_VAL) {
             pr_err("SELinux: Role %s has wrong value %d\n",
                    OBJECT_R, role->value);
             goto bad;
         }
         rc = 0;
         goto bad;
     }
 
     rc = symtab_insert(s, key, role);
     if (rc)
         goto bad;
     return 0;
 bad:
     role_destroy(key, role, NULL);
     return rc;
 }
 
 static int type_read(struct policydb *p, struct symtab *s, void *fp)
 {
     char *key = NULL;
     struct type_datum *typdatum;
     int rc, to_read = 3;
     __le32 buf[4];
     u32 len;
 
     typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL);
     if (!typdatum)
         return -ENOMEM;
 
     if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
         to_read = 4;
 
     rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
     if (rc)
         goto bad;
 
     len = le32_to_cpu(buf[0]);
     typdatum->value = le32_to_cpu(buf[1]);
     if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
         u32 prop = le32_to_cpu(buf[2]);
 
         if (prop & TYPEDATUM_PROPERTY_PRIMARY)
             typdatum->primary = 1;
         if (prop & TYPEDATUM_PROPERTY_ATTRIBUTE)
             typdatum->attribute = 1;
 
         typdatum->bounds = le32_to_cpu(buf[3]);
     } else {
         typdatum->primary = le32_to_cpu(buf[2]);
     }
 
     rc = str_read(&key, GFP_KERNEL, fp, len);
     if (rc)
         goto bad;
 
     rc = symtab_insert(s, key, typdatum);
     if (rc)
         goto bad;
     return 0;
 bad:
     type_destroy(key, typdatum, NULL);
     return rc;
 }
 
 
 /*
  * Read a MLS level structure from a policydb binary
  * representation file.
  */
 static int mls_read_level(struct mls_level *lp, void *fp)
 {
     __le32 buf[1];
     int rc;
 
     memset(lp, 0, sizeof(*lp));
 
     rc = next_entry(buf, fp, sizeof buf);
     if (rc) {
         pr_err("SELinux: mls: truncated level\n");
         return rc;
     }
     lp->sens = le32_to_cpu(buf[0]);
 
     rc = ebitmap_read(&lp->cat, fp);
     if (rc) {
         pr_err("SELinux: mls:  error reading level categories\n");
         return rc;
     }
     return 0;
 }
 
 static int user_read(struct policydb *p, struct symtab *s, void *fp)
 {
     char *key = NULL;
     struct user_datum *usrdatum;
     int rc, to_read = 2;
     __le32 buf[3];
     u32 len;
 
     usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
     if (!usrdatum)
         return -ENOMEM;
 
     if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
         to_read = 3;
 
     rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
     if (rc)
         goto bad;
 
     len = le32_to_cpu(buf[0]);
     usrdatum->value = le32_to_cpu(buf[1]);
     if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
         usrdatum->bounds = le32_to_cpu(buf[2]);
 
     rc = str_read(&key, GFP_KERNEL, fp, len);
     if (rc)
         goto bad;
 
     rc = ebitmap_read(&usrdatum->roles, fp);
     if (rc)
         goto bad;
 
     if (p->policyvers >= POLICYDB_VERSION_MLS) {
         rc = mls_read_range_helper(&usrdatum->range, fp);
         if (rc)
             goto bad;
         rc = mls_read_level(&usrdatum->dfltlevel, fp);
         if (rc)
             goto bad;
     }
 
     rc = symtab_insert(s, key, usrdatum);
     if (rc)
         goto bad;
     return 0;
 bad:
     user_destroy(key, usrdatum, NULL);
     return rc;
 }
 
 static int sens_read(struct policydb *p, struct symtab *s, void *fp)
 {
     char *key = NULL;
     struct level_datum *levdatum;
     int rc;
     __le32 buf[2];
     u32 len;
 
     levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC);
     if (!levdatum)
         return -ENOMEM;
 
     rc = next_entry(buf, fp, sizeof buf);
     if (rc)
         goto bad;
 
     len = le32_to_cpu(buf[0]);
     levdatum->isalias = le32_to_cpu(buf[1]);
 
     rc = str_read(&key, GFP_ATOMIC, fp, len);
     if (rc)
         goto bad;
 
     rc = -ENOMEM;
     levdatum->level = kmalloc(sizeof(*levdatum->level), GFP_ATOMIC);
     if (!levdatum->level)
         goto bad;
 
     rc = mls_read_level(levdatum->level, fp);
     if (rc)
         goto bad;
 
     rc = symtab_insert(s, key, levdatum);
     if (rc)
         goto bad;
     return 0;
 bad:
     sens_destroy(key, levdatum, NULL);
     return rc;
 }
 
 static int cat_read(struct policydb *p, struct symtab *s, void *fp)
 {
     char *key = NULL;
     struct cat_datum *catdatum;
     int rc;
     __le32 buf[3];
     u32 len;
 
     catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC);
     if (!catdatum)
         return -ENOMEM;
 
     rc = next_entry(buf, fp, sizeof buf);
     if (rc)
         goto bad;
 
     len = le32_to_cpu(buf[0]);
     catdatum->value = le32_to_cpu(buf[1]);
     catdatum->isalias = le32_to_cpu(buf[2]);
 
     rc = str_read(&key, GFP_ATOMIC, fp, len);
     if (rc)
         goto bad;
 
     rc = symtab_insert(s, key, catdatum);
     if (rc)
         goto bad;
     return 0;
 bad:
     cat_destroy(key, catdatum, NULL);
     return rc;
 }
 
 static int (*const read_f[SYM_NUM]) (struct policydb *p,
                      struct symtab *s, void *fp) = {
     common_read,
     class_read,
     role_read,
     type_read,
     user_read,
     cond_read_bool,
     sens_read,
     cat_read,
 };
 
 static int user_bounds_sanity_check(void *key, void *datum, void *datap)
 {
     struct user_datum *upper, *user;
     struct policydb *p = datap;
     int depth = 0;
 
     upper = user = datum;
     while (upper->bounds) {
         struct ebitmap_node *node;
         unsigned long bit;
 
         if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
             pr_err("SELinux: user %s: "
                    "too deep or looped boundary",
                    (char *) key);
             return -EINVAL;
         }
 
         upper = p->user_val_to_struct[upper->bounds - 1];
         ebitmap_for_each_positive_bit(&user->roles, node, bit) {
             if (ebitmap_get_bit(&upper->roles, bit))
                 continue;
 
             pr_err("SELinux: boundary violated policy: "
                    "user=%s role=%s bounds=%s\n",
                    sym_name(p, SYM_USERS, user->value - 1),
                    sym_name(p, SYM_ROLES, bit),
                    sym_name(p, SYM_USERS, upper->value - 1));
 
             return -EINVAL;
         }
     }
 
     return 0;
 }
 
 static int role_bounds_sanity_check(void *key, void *datum, void *datap)
 {
     struct role_datum *upper, *role;
     struct policydb *p = datap;
     int depth = 0;
 
     upper = role = datum;
     while (upper->bounds) {
         struct ebitmap_node *node;
         unsigned long bit;
 
         if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
             pr_err("SELinux: role %s: "
                    "too deep or looped bounds\n",
                    (char *) key);
             return -EINVAL;
         }
 
         upper = p->role_val_to_struct[upper->bounds - 1];
         ebitmap_for_each_positive_bit(&role->types, node, bit) {
             if (ebitmap_get_bit(&upper->types, bit))
                 continue;
 
             pr_err("SELinux: boundary violated policy: "
                    "role=%s type=%s bounds=%s\n",
                    sym_name(p, SYM_ROLES, role->value - 1),
                    sym_name(p, SYM_TYPES, bit),
                    sym_name(p, SYM_ROLES, upper->value - 1));
 
             return -EINVAL;
         }
     }
 
     return 0;
 }
 
 static int type_bounds_sanity_check(void *key, void *datum, void *datap)
 {
     struct type_datum *upper;
     struct policydb *p = datap;
     int depth = 0;
 
     upper = datum;
     while (upper->bounds) {
         if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
             pr_err("SELinux: type %s: "
                    "too deep or looped boundary\n",
                    (char *) key);
             return -EINVAL;
         }
 
         upper = p->type_val_to_struct[upper->bounds - 1];
         BUG_ON(!upper);
 
         if (upper->attribute) {
             pr_err("SELinux: type %s: "
                    "bounded by attribute %s",
                    (char *) key,
                    sym_name(p, SYM_TYPES, upper->value - 1));
             return -EINVAL;
         }
     }
 
     return 0;
 }
 
 static int policydb_bounds_sanity_check(struct policydb *p)
 {
     int rc;
 
     if (p->policyvers < POLICYDB_VERSION_BOUNDARY)
         return 0;
 
     rc = hashtab_map(&p->p_users.table, user_bounds_sanity_check, p);
     if (rc)
         return rc;
 
     rc = hashtab_map(&p->p_roles.table, role_bounds_sanity_check, p);
     if (rc)
         return rc;
 
     rc = hashtab_map(&p->p_types.table, type_bounds_sanity_check, p);
     if (rc)
         return rc;
 
     return 0;
 }
 
 u16 string_to_security_class(struct policydb *p, const char *name)
 {
     struct class_datum *cladatum;
 
     cladatum = symtab_search(&p->p_classes, name);
     if (!cladatum)
         return 0;
 
     return cladatum->value;
 }
 
 u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name)
 {
     struct class_datum *cladatum;
     struct perm_datum *perdatum = NULL;
     struct common_datum *comdatum;
 
     if (!tclass || tclass > p->p_classes.nprim)
         return 0;
 
     cladatum = p->class_val_to_struct[tclass-1];
     comdatum = cladatum->comdatum;
     if (comdatum)
         perdatum = symtab_search(&comdatum->permissions, name);
     if (!perdatum)
         perdatum = symtab_search(&cladatum->permissions, name);
     if (!perdatum)
         return 0;
 
     return 1U << (perdatum->value-1);
 }
 
 static int range_read(struct policydb *p, void *fp)
 {
     struct range_trans *rt = NULL;
     struct mls_range *r = NULL;
     int i, rc;
     __le32 buf[2];
     u32 nel;
 
     if (p->policyvers < POLICYDB_VERSION_MLS)
         return 0;
 
     rc = next_entry(buf, fp, sizeof(u32));
     if (rc)
         return rc;
 
     nel = le32_to_cpu(buf[0]);
 
     rc = hashtab_init(&p->range_tr, nel);
     if (rc)
         return rc;
 
     for (i = 0; i < nel; i++) {
         rc = -ENOMEM;
         rt = kzalloc(sizeof(*rt), GFP_KERNEL);
         if (!rt)
             goto out;
 
         rc = next_entry(buf, fp, (sizeof(u32) * 2));
         if (rc)
             goto out;
 
         rt->source_type = le32_to_cpu(buf[0]);
         rt->target_type = le32_to_cpu(buf[1]);
         if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
             rc = next_entry(buf, fp, sizeof(u32));
             if (rc)
                 goto out;
             rt->target_class = le32_to_cpu(buf[0]);
         } else
             rt->target_class = p->process_class;
 
         rc = -EINVAL;
         if (!policydb_type_isvalid(p, rt->source_type) ||
             !policydb_type_isvalid(p, rt->target_type) ||
             !policydb_class_isvalid(p, rt->target_class))
             goto out;
 
         rc = -ENOMEM;
         r = kzalloc(sizeof(*r), GFP_KERNEL);
         if (!r)
             goto out;
 
         rc = mls_read_range_helper(r, fp);
         if (rc)
             goto out;
 
         rc = -EINVAL;
         if (!mls_range_isvalid(p, r)) {
             pr_warn("SELinux:  rangetrans:  invalid range\n");
             goto out;
         }
 
         rc = hashtab_insert(&p->range_tr, rt, r, rangetr_key_params);
         if (rc)
             goto out;
 
         rt = NULL;
         r = NULL;
     }
     hash_eval(&p->range_tr, "rangetr");
     rc = 0;
 out:
     kfree(rt);
     kfree(r);
     return rc;
 }
 
 static int filename_trans_read_helper_compat(struct policydb *p, void *fp)
 {
     struct filename_trans_key key, *ft = NULL;
     struct filename_trans_datum *last, *datum = NULL;
     char *name = NULL;
     u32 len, stype, otype;
     __le32 buf[4];
     int rc;
 
     /* length of the path component string */
     rc = next_entry(buf, fp, sizeof(u32));
     if (rc)
         return rc;
     len = le32_to_cpu(buf[0]);
 
     /* path component string */
     rc = str_read(&name, GFP_KERNEL, fp, len);
     if (rc)
         return rc;
 
     rc = next_entry(buf, fp, sizeof(u32) * 4);
     if (rc)
         goto out;
 
     stype = le32_to_cpu(buf[0]);
     key.ttype = le32_to_cpu(buf[1]);
     key.tclass = le32_to_cpu(buf[2]);
     key.name = name;
 
     otype = le32_to_cpu(buf[3]);
 
     last = NULL;
     datum = policydb_filenametr_search(p, &key);
     while (datum) {
         if (unlikely(ebitmap_get_bit(&datum->stypes, stype - 1))) {
             /* conflicting/duplicate rules are ignored */
             datum = NULL;
             goto out;
         }
         if (likely(datum->otype == otype))
             break;
         last = datum;
         datum = datum->next;
     }
     if (!datum) {
         rc = -ENOMEM;
         datum = kmalloc(sizeof(*datum), GFP_KERNEL);
         if (!datum)
             goto out;
 
         ebitmap_init(&datum->stypes);
         datum->otype = otype;
         datum->next = NULL;
 
         if (unlikely(last)) {
             last->next = datum;
         } else {
             rc = -ENOMEM;
             ft = kmemdup(&key, sizeof(key), GFP_KERNEL);
             if (!ft)
                 goto out;
 
             rc = hashtab_insert(&p->filename_trans, ft, datum,
                         filenametr_key_params);
             if (rc)
                 goto out;
             name = NULL;
 
             rc = ebitmap_set_bit(&p->filename_trans_ttypes,
                          key.ttype, 1);
             if (rc)
                 return rc;
         }
     }
     kfree(name);
     return ebitmap_set_bit(&datum->stypes, stype - 1, 1);
 
 out:
     kfree(ft);
     kfree(name);
     kfree(datum);
     return rc;
 }
 
 static int filename_trans_read_helper(struct policydb *p, void *fp)
 {
     struct filename_trans_key *ft = NULL;
     struct filename_trans_datum **dst, *datum, *first = NULL;
     char *name = NULL;
     u32 len, ttype, tclass, ndatum, i;
     __le32 buf[3];
     int rc;
 
     /* length of the path component string */
     rc = next_entry(buf, fp, sizeof(u32));
     if (rc)
         return rc;
     len = le32_to_cpu(buf[0]);
 
     /* path component string */
     rc = str_read(&name, GFP_KERNEL, fp, len);
     if (rc)
         return rc;
 
     rc = next_entry(buf, fp, sizeof(u32) * 3);
     if (rc)
         goto out;
 
     ttype = le32_to_cpu(buf[0]);
     tclass = le32_to_cpu(buf[1]);
 
     ndatum = le32_to_cpu(buf[2]);
     if (ndatum == 0) {
         pr_err("SELinux:  Filename transition key with no datum\n");
         rc = -ENOENT;
         goto out;
     }
 
     dst = &first;
     for (i = 0; i < ndatum; i++) {
         rc = -ENOMEM;
         datum = kmalloc(sizeof(*datum), GFP_KERNEL);
         if (!datum)
             goto out;
 
         *dst = datum;
 
         /* ebitmap_read() will at least init the bitmap */
         rc = ebitmap_read(&datum->stypes, fp);
         if (rc)
             goto out;
 
         rc = next_entry(buf, fp, sizeof(u32));
         if (rc)
             goto out;
 
         datum->otype = le32_to_cpu(buf[0]);
         datum->next = NULL;
 
         dst = &datum->next;
     }
 
     rc = -ENOMEM;
     ft = kmalloc(sizeof(*ft), GFP_KERNEL);
     if (!ft)
         goto out;
 
     ft->ttype = ttype;
     ft->tclass = tclass;
     ft->name = name;
 
     rc = hashtab_insert(&p->filename_trans, ft, first,
                 filenametr_key_params);
     if (rc == -EEXIST)
         pr_err("SELinux:  Duplicate filename transition key\n");
     if (rc)
         goto out;
 
     return ebitmap_set_bit(&p->filename_trans_ttypes, ttype, 1);
 
 out:
     kfree(ft);
     kfree(name);
     while (first) {
         datum = first;
         first = first->next;
 
         ebitmap_destroy(&datum->stypes);
         kfree(datum);
     }
     return rc;
 }
 
 static int filename_trans_read(struct policydb *p, void *fp)
 {
     u32 nel;
     __le32 buf[1];
     int rc, i;
 
     if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
         return 0;
 
     rc = next_entry(buf, fp, sizeof(u32));
     if (rc)
         return rc;
     nel = le32_to_cpu(buf[0]);
 
     if (p->policyvers < POLICYDB_VERSION_COMP_FTRANS) {
         p->compat_filename_trans_count = nel;
 
         rc = hashtab_init(&p->filename_trans, (1 << 11));
         if (rc)
             return rc;
 
         for (i = 0; i < nel; i++) {
             rc = filename_trans_read_helper_compat(p, fp);
             if (rc)
                 return rc;
         }
     } else {
         rc = hashtab_init(&p->filename_trans, nel);
         if (rc)
             return rc;
 
         for (i = 0; i < nel; i++) {
             rc = filename_trans_read_helper(p, fp);
             if (rc)
                 return rc;
         }
     }
     hash_eval(&p->filename_trans, "filenametr");
     return 0;
 }
 
 static int genfs_read(struct policydb *p, void *fp)
 {
     int i, j, rc;
     u32 nel, nel2, len, len2;
     __le32 buf[1];
     struct ocontext *l, *c;
     struct ocontext *newc = NULL;
     struct genfs *genfs_p, *genfs;
     struct genfs *newgenfs = NULL;
 
     rc = next_entry(buf, fp, sizeof(u32));
     if (rc)
         return rc;
     nel = le32_to_cpu(buf[0]);
 
     for (i = 0; i < nel; i++) {
         rc = next_entry(buf, fp, sizeof(u32));
         if (rc)
             goto out;
         len = le32_to_cpu(buf[0]);
 
         rc = -ENOMEM;
         newgenfs = kzalloc(sizeof(*newgenfs), GFP_KERNEL);
         if (!newgenfs)
             goto out;
 
         rc = str_read(&newgenfs->fstype, GFP_KERNEL, fp, len);
         if (rc)
             goto out;
 
         for (genfs_p = NULL, genfs = p->genfs; genfs;
              genfs_p = genfs, genfs = genfs->next) {
             rc = -EINVAL;
             if (strcmp(newgenfs->fstype, genfs->fstype) == 0) {
                 pr_err("SELinux:  dup genfs fstype %s\n",
                        newgenfs->fstype);
                 goto out;
             }
             if (strcmp(newgenfs->fstype, genfs->fstype) < 0)
                 break;
         }
         newgenfs->next = genfs;
         if (genfs_p)
             genfs_p->next = newgenfs;
         else
             p->genfs = newgenfs;
         genfs = newgenfs;
         newgenfs = NULL;
 
         rc = next_entry(buf, fp, sizeof(u32));
         if (rc)
             goto out;
 
         nel2 = le32_to_cpu(buf[0]);
         for (j = 0; j < nel2; j++) {
             rc = next_entry(buf, fp, sizeof(u32));
             if (rc)
                 goto out;
             len = le32_to_cpu(buf[0]);
 
             rc = -ENOMEM;
             newc = kzalloc(sizeof(*newc), GFP_KERNEL);
             if (!newc)
                 goto out;
 
             rc = str_read(&newc->u.name, GFP_KERNEL, fp, len);
             if (rc)
                 goto out;
 
             rc = next_entry(buf, fp, sizeof(u32));
             if (rc)
                 goto out;
 
             newc->v.sclass = le32_to_cpu(buf[0]);
             rc = context_read_and_validate(&newc->context[0], p, fp);
             if (rc)
                 goto out;
 
             for (l = NULL, c = genfs->head; c;
                  l = c, c = c->next) {
                 rc = -EINVAL;
                 if (!strcmp(newc->u.name, c->u.name) &&
                     (!c->v.sclass || !newc->v.sclass ||
                      newc->v.sclass == c->v.sclass)) {
                     pr_err("SELinux:  dup genfs entry (%s,%s)\n",
                            genfs->fstype, c->u.name);
                     goto out;
                 }
                 len = strlen(newc->u.name);
                 len2 = strlen(c->u.name);
                 if (len > len2)
                     break;
             }
 
             newc->next = c;
             if (l)
                 l->next = newc;
             else
                 genfs->head = newc;
             newc = NULL;
         }
     }
     rc = 0;
 out:
     if (newgenfs) {
         kfree(newgenfs->fstype);
         kfree(newgenfs);
     }
     ocontext_destroy(newc, OCON_FSUSE);
 
     return rc;
 }
 
 static int ocontext_read(struct policydb *p, const struct policydb_compat_info *info,
              void *fp)
 {
     int i, j, rc;
     u32 nel, len;
     __be64 prefixbuf[1];
     __le32 buf[3];
     struct ocontext *l, *c;
     u32 nodebuf[8];
 
     for (i = 0; i < info->ocon_num; i++) {
         rc = next_entry(buf, fp, sizeof(u32));
         if (rc)
             goto out;
         nel = le32_to_cpu(buf[0]);
 
         l = NULL;
         for (j = 0; j < nel; j++) {
             rc = -ENOMEM;
             c = kzalloc(sizeof(*c), GFP_KERNEL);
             if (!c)
                 goto out;
             if (l)
                 l->next = c;
             else
                 p->ocontexts[i] = c;
             l = c;
 
             switch (i) {
             case OCON_ISID:
                 rc = next_entry(buf, fp, sizeof(u32));
                 if (rc)
                     goto out;
 
                 c->sid[0] = le32_to_cpu(buf[0]);
                 rc = context_read_and_validate(&c->context[0], p, fp);
                 if (rc)
                     goto out;
                 break;
             case OCON_FS:
             case OCON_NETIF:
                 rc = next_entry(buf, fp, sizeof(u32));
                 if (rc)
                     goto out;
                 len = le32_to_cpu(buf[0]);
 
                 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
                 if (rc)
                     goto out;
 
                 rc = context_read_and_validate(&c->context[0], p, fp);
                 if (rc)
                     goto out;
                 rc = context_read_and_validate(&c->context[1], p, fp);
                 if (rc)
                     goto out;
                 break;
             case OCON_PORT:
                 rc = next_entry(buf, fp, sizeof(u32)*3);
                 if (rc)
                     goto out;
                 c->u.port.protocol = le32_to_cpu(buf[0]);
                 c->u.port.low_port = le32_to_cpu(buf[1]);
                 c->u.port.high_port = le32_to_cpu(buf[2]);
                 rc = context_read_and_validate(&c->context[0], p, fp);
                 if (rc)
                     goto out;
                 break;
             case OCON_NODE:
                 rc = next_entry(nodebuf, fp, sizeof(u32) * 2);
                 if (rc)
                     goto out;
                 c->u.node.addr = nodebuf[0]; /* network order */
                 c->u.node.mask = nodebuf[1]; /* network order */
                 rc = context_read_and_validate(&c->context[0], p, fp);
                 if (rc)
                     goto out;
                 break;
             case OCON_FSUSE:
                 rc = next_entry(buf, fp, sizeof(u32)*2);
                 if (rc)
                     goto out;
 
                 rc = -EINVAL;
                 c->v.behavior = le32_to_cpu(buf[0]);
                 /* Determined at runtime, not in policy DB. */
                 if (c->v.behavior == SECURITY_FS_USE_MNTPOINT)
                     goto out;
                 if (c->v.behavior > SECURITY_FS_USE_MAX)
                     goto out;
 
                 len = le32_to_cpu(buf[1]);
                 rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
                 if (rc)
                     goto out;
 
                 rc = context_read_and_validate(&c->context[0], p, fp);
                 if (rc)
                     goto out;
                 break;
             case OCON_NODE6: {
                 int k;
 
                 rc = next_entry(nodebuf, fp, sizeof(u32) * 8);
                 if (rc)
                     goto out;
                 for (k = 0; k < 4; k++)
                     c->u.node6.addr[k] = nodebuf[k];
                 for (k = 0; k < 4; k++)
                     c->u.node6.mask[k] = nodebuf[k+4];
                 rc = context_read_and_validate(&c->context[0], p, fp);
                 if (rc)
                     goto out;
                 break;
             }
             case OCON_IBPKEY: {
                 u32 pkey_lo, pkey_hi;
 
                 rc = next_entry(prefixbuf, fp, sizeof(u64));
                 if (rc)
                     goto out;
 
                 /* we need to have subnet_prefix in CPU order */
                 c->u.ibpkey.subnet_prefix = be64_to_cpu(prefixbuf[0]);
 
                 rc = next_entry(buf, fp, sizeof(u32) * 2);
                 if (rc)
                     goto out;
 
                 pkey_lo = le32_to_cpu(buf[0]);
                 pkey_hi = le32_to_cpu(buf[1]);
 
                 if (pkey_lo > U16_MAX || pkey_hi > U16_MAX) {
                     rc = -EINVAL;
                     goto out;
                 }
 
                 c->u.ibpkey.low_pkey  = pkey_lo;
                 c->u.ibpkey.high_pkey = pkey_hi;
 
                 rc = context_read_and_validate(&c->context[0],
                                    p,
                                    fp);
                 if (rc)
                     goto out;
                 break;
             }
             case OCON_IBENDPORT: {
                 u32 port;
 
                 rc = next_entry(buf, fp, sizeof(u32) * 2);
                 if (rc)
                     goto out;
                 len = le32_to_cpu(buf[0]);
 
                 rc = str_read(&c->u.ibendport.dev_name, GFP_KERNEL, fp, len);
                 if (rc)
                     goto out;
 
                 port = le32_to_cpu(buf[1]);
                 if (port > U8_MAX || port == 0) {
                     rc = -EINVAL;
                     goto out;
                 }
 
                 c->u.ibendport.port = port;
 
                 rc = context_read_and_validate(&c->context[0],
                                    p,
                                    fp);
                 if (rc)
                     goto out;
                 break;
             } /* end case */
             } /* end switch */
         }
     }
     rc = 0;
 out:
     return rc;
 }
 
 /*
  * Read the configuration data from a policy database binary
  * representation file into a policy database structure.
  */
 int policydb_read(struct policydb *p, void *fp)
 {
     struct role_allow *ra, *lra;
     struct role_trans_key *rtk = NULL;
     struct role_trans_datum *rtd = NULL;
     int i, j, rc;
     __le32 buf[4];
     u32 len, nprim, nel, perm;
 
     char *policydb_str;
     const struct policydb_compat_info *info;
 
     policydb_init(p);
 
     /* Read the magic number and string length. */
     rc = next_entry(buf, fp, sizeof(u32) * 2);
     if (rc)
         goto bad;
 
     rc = -EINVAL;
     if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
         pr_err("SELinux:  policydb magic number 0x%x does "
                "not match expected magic number 0x%x\n",
                le32_to_cpu(buf[0]), POLICYDB_MAGIC);
         goto bad;
     }
 
     rc = -EINVAL;
     len = le32_to_cpu(buf[1]);
     if (len != strlen(POLICYDB_STRING)) {
         pr_err("SELinux:  policydb string length %d does not "
                "match expected length %zu\n",
                len, strlen(POLICYDB_STRING));
         goto bad;
     }
 
     rc = -ENOMEM;
     policydb_str = kmalloc(len + 1, GFP_KERNEL);
     if (!policydb_str) {
         pr_err("SELinux:  unable to allocate memory for policydb "
                "string of length %d\n", len);
         goto bad;
     }
 
     rc = next_entry(policydb_str, fp, len);
     if (rc) {
         pr_err("SELinux:  truncated policydb string identifier\n");
         kfree(policydb_str);
         goto bad;
     }
 
     rc = -EINVAL;
     policydb_str[len] = '\0';
     if (strcmp(policydb_str, POLICYDB_STRING)) {
         pr_err("SELinux:  policydb string %s does not match "
                "my string %s\n", policydb_str, POLICYDB_STRING);
         kfree(policydb_str);
         goto bad;
     }
     /* Done with policydb_str. */
     kfree(policydb_str);
     policydb_str = NULL;
 
     /* Read the version and table sizes. */
     rc = next_entry(buf, fp, sizeof(u32)*4);
     if (rc)
         goto bad;
 
     rc = -EINVAL;
     p->policyvers = le32_to_cpu(buf[0]);
     if (p->policyvers < POLICYDB_VERSION_MIN ||
         p->policyvers > POLICYDB_VERSION_MAX) {
         pr_err("SELinux:  policydb version %d does not match "
                "my version range %d-%d\n",
                le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
         goto bad;
     }
 
     if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
         p->mls_enabled = 1;
 
         rc = -EINVAL;
         if (p->policyvers < POLICYDB_VERSION_MLS) {
             pr_err("SELinux: security policydb version %d "
                 "(MLS) not backwards compatible\n",
                 p->policyvers);
             goto bad;
         }
     }
     p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
     p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
 
     if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
         rc = ebitmap_read(&p->policycaps, fp);
         if (rc)
             goto bad;
     }
 
     if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
         rc = ebitmap_read(&p->permissive_map, fp);
         if (rc)
             goto bad;
     }
 
     rc = -EINVAL;
     info = policydb_lookup_compat(p->policyvers);
     if (!info) {
         pr_err("SELinux:  unable to find policy compat info "
                "for version %d\n", p->policyvers);
         goto bad;
     }
 
     rc = -EINVAL;
     if (le32_to_cpu(buf[2]) != info->sym_num ||
         le32_to_cpu(buf[3]) != info->ocon_num) {
         pr_err("SELinux:  policydb table sizes (%d,%d) do "
                "not match mine (%d,%d)\n", le32_to_cpu(buf[2]),
             le32_to_cpu(buf[3]),
                info->sym_num, info->ocon_num);
         goto bad;
     }
 
     for (i = 0; i < info->sym_num; i++) {
         rc = next_entry(buf, fp, sizeof(u32)*2);
         if (rc)
             goto bad;
         nprim = le32_to_cpu(buf[0]);
         nel = le32_to_cpu(buf[1]);
 
         rc = symtab_init(&p->symtab[i], nel);
         if (rc)
             goto out;
 
         if (i == SYM_ROLES) {
             rc = roles_init(p);
             if (rc)
                 goto out;
         }
 
         for (j = 0; j < nel; j++) {
             rc = read_f[i](p, &p->symtab[i], fp);
             if (rc)
                 goto bad;
         }
 
         p->symtab[i].nprim = nprim;
     }
 
     rc = -EINVAL;
     p->process_class = string_to_security_class(p, "process");
     if (!p->process_class) {
         pr_err("SELinux: process class is required, not defined in policy\n");
         goto bad;
     }
 
     rc = avtab_read(&p->te_avtab, fp, p);
     if (rc)
         goto bad;
 
     if (p->policyvers >= POLICYDB_VERSION_BOOL) {
         rc = cond_read_list(p, fp);
         if (rc)
             goto bad;
     }
 
     rc = next_entry(buf, fp, sizeof(u32));
     if (rc)
         goto bad;
     nel = le32_to_cpu(buf[0]);
 
     rc = hashtab_init(&p->role_tr, nel);
     if (rc)
         goto bad;
     for (i = 0; i < nel; i++) {
         rc = -ENOMEM;
         rtk = kmalloc(sizeof(*rtk), GFP_KERNEL);
         if (!rtk)
             goto bad;
 
         rc = -ENOMEM;
         rtd = kmalloc(sizeof(*rtd), GFP_KERNEL);
         if (!rtd)
             goto bad;
 
         rc = next_entry(buf, fp, sizeof(u32)*3);
         if (rc)
             goto bad;
 
         rtk->role = le32_to_cpu(buf[0]);
         rtk->type = le32_to_cpu(buf[1]);
         rtd->new_role = le32_to_cpu(buf[2]);
         if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
             rc = next_entry(buf, fp, sizeof(u32));
             if (rc)
                 goto bad;
             rtk->tclass = le32_to_cpu(buf[0]);
         } else
             rtk->tclass = p->process_class;
 
         rc = -EINVAL;
         if (!policydb_role_isvalid(p, rtk->role) ||
             !policydb_type_isvalid(p, rtk->type) ||
             !policydb_class_isvalid(p, rtk->tclass) ||
             !policydb_role_isvalid(p, rtd->new_role))
             goto bad;
 
         rc = hashtab_insert(&p->role_tr, rtk, rtd, roletr_key_params);
         if (rc)
             goto bad;
 
         rtk = NULL;
         rtd = NULL;
     }
 
     rc = next_entry(buf, fp, sizeof(u32));
     if (rc)
         goto bad;
     nel = le32_to_cpu(buf[0]);
     lra = NULL;
     for (i = 0; i < nel; i++) {
         rc = -ENOMEM;
         ra = kzalloc(sizeof(*ra), GFP_KERNEL);
         if (!ra)
             goto bad;
         if (lra)
             lra->next = ra;
         else
             p->role_allow = ra;
         rc = next_entry(buf, fp, sizeof(u32)*2);
         if (rc)
             goto bad;
 
         rc = -EINVAL;
         ra->role = le32_to_cpu(buf[0]);
         ra->new_role = le32_to_cpu(buf[1]);
         if (!policydb_role_isvalid(p, ra->role) ||
             !policydb_role_isvalid(p, ra->new_role))
             goto bad;
         lra = ra;
     }
 
     rc = filename_trans_read(p, fp);
     if (rc)
         goto bad;
 
     rc = policydb_index(p);
     if (rc)
         goto bad;
 
     rc = -EINVAL;
     perm = string_to_av_perm(p, p->process_class, "transition");
     if (!perm) {
         pr_err("SELinux: process transition permission is required, not defined in policy\n");
         goto bad;
     }
     p->process_trans_perms = perm;
     perm = string_to_av_perm(p, p->process_class, "dyntransition");
     if (!perm) {
         pr_err("SELinux: process dyntransition permission is required, not defined in policy\n");
         goto bad;
     }
     p->process_trans_perms |= perm;
 
     rc = ocontext_read(p, info, fp);
     if (rc)
         goto bad;
 
     rc = genfs_read(p, fp);
     if (rc)
         goto bad;
 
     rc = range_read(p, fp);
     if (rc)
         goto bad;
 
     rc = -ENOMEM;
     p->type_attr_map_array = kvcalloc(p->p_types.nprim,
                       sizeof(*p->type_attr_map_array),
                       GFP_KERNEL);
     if (!p->type_attr_map_array)
         goto bad;
 
     /* just in case ebitmap_init() becomes more than just a memset(0): */
     for (i = 0; i < p->p_types.nprim; i++)
         ebitmap_init(&p->type_attr_map_array[i]);
 
     for (i = 0; i < p->p_types.nprim; i++) {
         struct ebitmap *e = &p->type_attr_map_array[i];
 
         if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
             rc = ebitmap_read(e, fp);
             if (rc)
                 goto bad;
         }
         /* add the type itself as the degenerate case */
         rc = ebitmap_set_bit(e, i, 1);
         if (rc)
             goto bad;
     }
 
     rc = policydb_bounds_sanity_check(p);
     if (rc)
         goto bad;
 
     rc = 0;
 out:
     return rc;
 bad:
     kfree(rtk);
     kfree(rtd);
     policydb_destroy(p);
     goto out;
 }
 
 /*
  * Write a MLS level structure to a policydb binary
  * representation file.
  */
 static int mls_write_level(struct mls_level *l, void *fp)
 {
     __le32 buf[1];
     int rc;
 
     buf[0] = cpu_to_le32(l->sens);
     rc = put_entry(buf, sizeof(u32), 1, fp);
     if (rc)
         return rc;
 
     rc = ebitmap_write(&l->cat, fp);
     if (rc)
         return rc;
 
     return 0;
 }
 
 /*
  * Write a MLS range structure to a policydb binary
  * representation file.
  */
 static int mls_write_range_helper(struct mls_range *r, void *fp)
 {
     __le32 buf[3];
     size_t items;
     int rc, eq;
 
     eq = mls_level_eq(&r->level[1], &r->level[0]);
 
     if (eq)
         items = 2;
     else
         items = 3;
     buf[0] = cpu_to_le32(items-1);
     buf[1] = cpu_to_le32(r->level[0].sens);
     if (!eq)
         buf[2] = cpu_to_le32(r->level[1].sens);
 
     BUG_ON(items > ARRAY_SIZE(buf));
 
     rc = put_entry(buf, sizeof(u32), items, fp);
     if (rc)
         return rc;
 
     rc = ebitmap_write(&r->level[0].cat, fp);
     if (rc)
         return rc;
     if (!eq) {
         rc = ebitmap_write(&r->level[1].cat, fp);
         if (rc)
             return rc;
     }
 
     return 0;
 }
 
 static int sens_write(void *vkey, void *datum, void *ptr)
 {
     char *key = vkey;
     struct level_datum *levdatum = datum;
     struct policy_data *pd = ptr;
     void *fp = pd->fp;
     __le32 buf[2];
     size_t len;
     int rc;
 
     len = strlen(key);
     buf[0] = cpu_to_le32(len);
     buf[1] = cpu_to_le32(levdatum->isalias);
     rc = put_entry(buf, sizeof(u32), 2, fp);
     if (rc)
         return rc;
 
     rc = put_entry(key, 1, len, fp);
     if (rc)
         return rc;
 
     rc = mls_write_level(levdatum->level, fp);
     if (rc)
         return rc;
 
     return 0;
 }
 
 static int cat_write(void *vkey, void *datum, void *ptr)
 {
     char *key = vkey;
     struct cat_datum *catdatum = datum;
     struct policy_data *pd = ptr;
     void *fp = pd->fp;
     __le32 buf[3];
     size_t len;
     int rc;
 
     len = strlen(key);
     buf[0] = cpu_to_le32(len);
     buf[1] = cpu_to_le32(catdatum->value);
     buf[2] = cpu_to_le32(catdatum->isalias);
     rc = put_entry(buf, sizeof(u32), 3, fp);
     if (rc)
         return rc;
 
     rc = put_entry(key, 1, len, fp);
     if (rc)
         return rc;
 
     return 0;
 }
 
 static int role_trans_write_one(void *key, void *datum, void *ptr)
 {
     struct role_trans_key *rtk = key;
     struct role_trans_datum *rtd = datum;
     struct policy_data *pd = ptr;
     void *fp = pd->fp;
     struct policydb *p = pd->p;
     __le32 buf[3];
     int rc;
 
     buf[0] = cpu_to_le32(rtk->role);
     buf[1] = cpu_to_le32(rtk->type);
     buf[2] = cpu_to_le32(rtd->new_role);
     rc = put_entry(buf, sizeof(u32), 3, fp);
     if (rc)
         return rc;
     if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
         buf[0] = cpu_to_le32(rtk->tclass);
         rc = put_entry(buf, sizeof(u32), 1, fp);
         if (rc)
             return rc;
     }
     return 0;
 }
 
 static int role_trans_write(struct policydb *p, void *fp)
 {
     struct policy_data pd = { .p = p, .fp = fp };
     __le32 buf[1];
     int rc;
 
     buf[0] = cpu_to_le32(p->role_tr.nel);
     rc = put_entry(buf, sizeof(u32), 1, fp);
     if (rc)
         return rc;
 
     return hashtab_map(&p->role_tr, role_trans_write_one, &pd);
 }
 
 static int role_allow_write(struct role_allow *r, void *fp)
 {
     struct role_allow *ra;
     __le32 buf[2];
     size_t nel;
     int rc;
 
     nel = 0;
     for (ra = r; ra; ra = ra->next)
         nel++;
     buf[0] = cpu_to_le32(nel);
     rc = put_entry(buf, sizeof(u32), 1, fp);
     if (rc)
         return rc;
     for (ra = r; ra; ra = ra->next) {
         buf[0] = cpu_to_le32(ra->role);
         buf[1] = cpu_to_le32(ra->new_role);
         rc = put_entry(buf, sizeof(u32), 2, fp);
         if (rc)
             return rc;
     }
     return 0;
 }
 
 /*
  * Write a security context structure
  * to a policydb binary representation file.
  */
 static int context_write(struct policydb *p, struct context *c,
              void *fp)
 {
     int rc;
     __le32 buf[3];
 
     buf[0] = cpu_to_le32(c->user);
     buf[1] = cpu_to_le32(c->role);
     buf[2] = cpu_to_le32(c->type);
 
     rc = put_entry(buf, sizeof(u32), 3, fp);
     if (rc)
         return rc;
 
     rc = mls_write_range_helper(&c->range, fp);
     if (rc)
         return rc;
 
     return 0;
 }
 
 /*
  * The following *_write functions are used to
  * write the symbol data to a policy database
  * binary representation file.
  */
 
 static int perm_write(void *vkey, void *datum, void *fp)
 {
     char *key = vkey;
     struct perm_datum *perdatum = datum;
     __le32 buf[2];
     size_t len;
     int rc;
 
     len = strlen(key);
     buf[0] = cpu_to_le32(len);
     buf[1] = cpu_to_le32(perdatum->value);
     rc = put_entry(buf, sizeof(u32), 2, fp);
     if (rc)
         return rc;
 
     rc = put_entry(key, 1, len, fp);
     if (rc)
         return rc;
 
     return 0;
 }
 
 static int common_write(void *vkey, void *datum, void *ptr)
 {
     char *key = vkey;
     struct common_datum *comdatum = datum;
     struct policy_data *pd = ptr;
     void *fp = pd->fp;
     __le32 buf[4];
     size_t len;
     int rc;
 
     len = strlen(key);
     buf[0] = cpu_to_le32(len);
     buf[1] = cpu_to_le32(comdatum->value);
     buf[2] = cpu_to_le32(comdatum->permissions.nprim);
     buf[3] = cpu_to_le32(comdatum->permissions.table.nel);
     rc = put_entry(buf, sizeof(u32), 4, fp);
     if (rc)
         return rc;
 
     rc = put_entry(key, 1, len, fp);
     if (rc)
         return rc;
 
     rc = hashtab_map(&comdatum->permissions.table, perm_write, fp);
     if (rc)
         return rc;
 
     return 0;
 }
 
 static int type_set_write(struct type_set *t, void *fp)
 {
     int rc;
     __le32 buf[1];
 
     if (ebitmap_write(&t->types, fp))
         return -EINVAL;
     if (ebitmap_write(&t->negset, fp))
         return -EINVAL;
 
     buf[0] = cpu_to_le32(t->flags);
     rc = put_entry(buf, sizeof(u32), 1, fp);
     if (rc)
         return -EINVAL;
 
     return 0;
 }
 
 static int write_cons_helper(struct policydb *p, struct constraint_node *node,
                  void *fp)
 {
     struct constraint_node *c;
     struct constraint_expr *e;
     __le32 buf[3];
     u32 nel;
     int rc;
 
     for (c = node; c; c = c->next) {
         nel = 0;
         for (e = c->expr; e; e = e->next)
             nel++;
         buf[0] = cpu_to_le32(c->permissions);
         buf[1] = cpu_to_le32(nel);
         rc = put_entry(buf, sizeof(u32), 2, fp);
         if (rc)
             return rc;
         for (e = c->expr; e; e = e->next) {
             buf[0] = cpu_to_le32(e->expr_type);
             buf[1] = cpu_to_le32(e->attr);
             buf[2] = cpu_to_le32(e->op);
             rc = put_entry(buf, sizeof(u32), 3, fp);
             if (rc)
                 return rc;
 
             switch (e->expr_type) {
             case CEXPR_NAMES:
                 rc = ebitmap_write(&e->names, fp);
                 if (rc)
                     return rc;
                 if (p->policyvers >=
                     POLICYDB_VERSION_CONSTRAINT_NAMES) {
                     rc = type_set_write(e->type_names, fp);
                     if (rc)
                         return rc;
                 }
                 break;
             default:
                 break;
             }
         }
     }
 
     return 0;
 }
 
 static int class_write(void *vkey, void *datum, void *ptr)
 {
     char *key = vkey;
     struct class_datum *cladatum = datum;
     struct policy_data *pd = ptr;
     void *fp = pd->fp;
     struct policydb *p = pd->p;
     struct constraint_node *c;
     __le32 buf[6];
     u32 ncons;
     size_t len, len2;
     int rc;
 
     len = strlen(key);
     if (cladatum->comkey)
         len2 = strlen(cladatum->comkey);
     else
         len2 = 0;
 
     ncons = 0;
     for (c = cladatum->constraints; c; c = c->next)
         ncons++;
 
     buf[0] = cpu_to_le32(len);
     buf[1] = cpu_to_le32(len2);
     buf[2] = cpu_to_le32(cladatum->value);
     buf[3] = cpu_to_le32(cladatum->permissions.nprim);
     buf[4] = cpu_to_le32(cladatum->permissions.table.nel);
     buf[5] = cpu_to_le32(ncons);
     rc = put_entry(buf, sizeof(u32), 6, fp);
     if (rc)
         return rc;
 
     rc = put_entry(key, 1, len, fp);
     if (rc)
         return rc;
 
     if (cladatum->comkey) {
         rc = put_entry(cladatum->comkey, 1, len2, fp);
         if (rc)
             return rc;
     }
 
     rc = hashtab_map(&cladatum->permissions.table, perm_write, fp);
     if (rc)
         return rc;
 
     rc = write_cons_helper(p, cladatum->constraints, fp);
     if (rc)
         return rc;
 
     /* write out the validatetrans rule */
     ncons = 0;
     for (c = cladatum->validatetrans; c; c = c->next)
         ncons++;
 
     buf[0] = cpu_to_le32(ncons);
     rc = put_entry(buf, sizeof(u32), 1, fp);
     if (rc)
         return rc;
 
     rc = write_cons_helper(p, cladatum->validatetrans, fp);
     if (rc)
         return rc;
 
     if (p->policyvers >= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS) {
         buf[0] = cpu_to_le32(cladatum->default_user);
         buf[1] = cpu_to_le32(cladatum->default_role);
         buf[2] = cpu_to_le32(cladatum->default_range);
 
         rc = put_entry(buf, sizeof(uint32_t), 3, fp);
         if (rc)
             return rc;
     }
 
     if (p->policyvers >= POLICYDB_VERSION_DEFAULT_TYPE) {
         buf[0] = cpu_to_le32(cladatum->default_type);
         rc = put_entry(buf, sizeof(uint32_t), 1, fp);
         if (rc)
             return rc;
     }
 
     return 0;
 }
 
 static int role_write(void *vkey, void *datum, void *ptr)
 {
     char *key = vkey;
     struct role_datum *role = datum;
     struct policy_data *pd = ptr;
     void *fp = pd->fp;
     struct policydb *p = pd->p;
     __le32 buf[3];
     size_t items, len;
     int rc;
 
     len = strlen(key);
     items = 0;
     buf[items++] = cpu_to_le32(len);
     buf[items++] = cpu_to_le32(role->value);
     if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
         buf[items++] = cpu_to_le32(role->bounds);
 
     BUG_ON(items > ARRAY_SIZE(buf));
 
     rc = put_entry(buf, sizeof(u32), items, fp);
     if (rc)
         return rc;
 
     rc = put_entry(key, 1, len, fp);
     if (rc)
         return rc;
 
     rc = ebitmap_write(&role->dominates, fp);
     if (rc)
         return rc;
 
     rc = ebitmap_write(&role->types, fp);
     if (rc)
         return rc;
 
     return 0;
 }
 
 static int type_write(void *vkey, void *datum, void *ptr)
 {
     char *key = vkey;
     struct type_datum *typdatum = datum;
     struct policy_data *pd = ptr;
     struct policydb *p = pd->p;
     void *fp = pd->fp;
     __le32 buf[4];
     int rc;
     size_t items, len;
 
     len = strlen(key);
     items = 0;
     buf[items++] = cpu_to_le32(len);
     buf[items++] = cpu_to_le32(typdatum->value);
     if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) {
         u32 properties = 0;
 
         if (typdatum->primary)
             properties |= TYPEDATUM_PROPERTY_PRIMARY;
 
         if (typdatum->attribute)
             properties |= TYPEDATUM_PROPERTY_ATTRIBUTE;
 
         buf[items++] = cpu_to_le32(properties);
         buf[items++] = cpu_to_le32(typdatum->bounds);
     } else {
         buf[items++] = cpu_to_le32(typdatum->primary);
     }
     BUG_ON(items > ARRAY_SIZE(buf));
     rc = put_entry(buf, sizeof(u32), items, fp);
     if (rc)
         return rc;
 
     rc = put_entry(key, 1, len, fp);
     if (rc)
         return rc;
 
     return 0;
 }
 
 static int user_write(void *vkey, void *datum, void *ptr)
 {
     char *key = vkey;
     struct user_datum *usrdatum = datum;
     struct policy_data *pd = ptr;
     struct policydb *p = pd->p;
     void *fp = pd->fp;
     __le32 buf[3];
     size_t items, len;
     int rc;
 
     len = strlen(key);
     items = 0;
     buf[items++] = cpu_to_le32(len);
     buf[items++] = cpu_to_le32(usrdatum->value);
     if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
         buf[items++] = cpu_to_le32(usrdatum->bounds);
     BUG_ON(items > ARRAY_SIZE(buf));
     rc = put_entry(buf, sizeof(u32), items, fp);
     if (rc)
         return rc;
 
     rc = put_entry(key, 1, len, fp);
     if (rc)
         return rc;
 
     rc = ebitmap_write(&usrdatum->roles, fp);
     if (rc)
         return rc;
 
     rc = mls_write_range_helper(&usrdatum->range, fp);
     if (rc)
         return rc;
 
     rc = mls_write_level(&usrdatum->dfltlevel, fp);
     if (rc)
         return rc;
 
     return 0;
 }
 
 static int (*const write_f[SYM_NUM]) (void *key, void *datum, void *datap) = {
     common_write,
     class_write,
     role_write,
     type_write,
     user_write,
     cond_write_bool,
     sens_write,
     cat_write,
 };
 
 static int ocontext_write(struct policydb *p, const struct policydb_compat_info *info,
               void *fp)
 {
     unsigned int i, j, rc;
     size_t nel, len;
     __be64 prefixbuf[1];
     __le32 buf[3];
     u32 nodebuf[8];
     struct ocontext *c;
     for (i = 0; i < info->ocon_num; i++) {
         nel = 0;
         for (c = p->ocontexts[i]; c; c = c->next)
             nel++;
         buf[0] = cpu_to_le32(nel);
         rc = put_entry(buf, sizeof(u32), 1, fp);
         if (rc)
             return rc;
         for (c = p->ocontexts[i]; c; c = c->next) {
             switch (i) {
             case OCON_ISID:
                 buf[0] = cpu_to_le32(c->sid[0]);
                 rc = put_entry(buf, sizeof(u32), 1, fp);
                 if (rc)
                     return rc;
                 rc = context_write(p, &c->context[0], fp);
                 if (rc)
                     return rc;
                 break;
             case OCON_FS:
             case OCON_NETIF:
                 len = strlen(c->u.name);
                 buf[0] = cpu_to_le32(len);
                 rc = put_entry(buf, sizeof(u32), 1, fp);
                 if (rc)
                     return rc;
                 rc = put_entry(c->u.name, 1, len, fp);
                 if (rc)
                     return rc;
                 rc = context_write(p, &c->context[0], fp);
                 if (rc)
                     return rc;
                 rc = context_write(p, &c->context[1], fp);
                 if (rc)
                     return rc;
                 break;
             case OCON_PORT:
                 buf[0] = cpu_to_le32(c->u.port.protocol);
                 buf[1] = cpu_to_le32(c->u.port.low_port);
                 buf[2] = cpu_to_le32(c->u.port.high_port);
                 rc = put_entry(buf, sizeof(u32), 3, fp);
                 if (rc)
                     return rc;
                 rc = context_write(p, &c->context[0], fp);
                 if (rc)
                     return rc;
                 break;
             case OCON_NODE:
                 nodebuf[0] = c->u.node.addr; /* network order */
                 nodebuf[1] = c->u.node.mask; /* network order */
                 rc = put_entry(nodebuf, sizeof(u32), 2, fp);
                 if (rc)
                     return rc;
                 rc = context_write(p, &c->context[0], fp);
                 if (rc)
                     return rc;
                 break;
             case OCON_FSUSE:
                 buf[0] = cpu_to_le32(c->v.behavior);
                 len = strlen(c->u.name);
                 buf[1] = cpu_to_le32(len);
                 rc = put_entry(buf, sizeof(u32), 2, fp);
                 if (rc)
                     return rc;
                 rc = put_entry(c->u.name, 1, len, fp);
                 if (rc)
                     return rc;
                 rc = context_write(p, &c->context[0], fp);
                 if (rc)
                     return rc;
                 break;
             case OCON_NODE6:
                 for (j = 0; j < 4; j++)
                     nodebuf[j] = c->u.node6.addr[j]; /* network order */
                 for (j = 0; j < 4; j++)
                     nodebuf[j + 4] = c->u.node6.mask[j]; /* network order */
                 rc = put_entry(nodebuf, sizeof(u32), 8, fp);
                 if (rc)
                     return rc;
                 rc = context_write(p, &c->context[0], fp);
                 if (rc)
                     return rc;
                 break;
             case OCON_IBPKEY:
                 /* subnet_prefix is in CPU order */
                 prefixbuf[0] = cpu_to_be64(c->u.ibpkey.subnet_prefix);
 
                 rc = put_entry(prefixbuf, sizeof(u64), 1, fp);
                 if (rc)
                     return rc;
 
                 buf[0] = cpu_to_le32(c->u.ibpkey.low_pkey);
                 buf[1] = cpu_to_le32(c->u.ibpkey.high_pkey);
 
                 rc = put_entry(buf, sizeof(u32), 2, fp);
                 if (rc)
                     return rc;
                 rc = context_write(p, &c->context[0], fp);
                 if (rc)
                     return rc;
                 break;
             case OCON_IBENDPORT:
                 len = strlen(c->u.ibendport.dev_name);
                 buf[0] = cpu_to_le32(len);
                 buf[1] = cpu_to_le32(c->u.ibendport.port);
                 rc = put_entry(buf, sizeof(u32), 2, fp);
                 if (rc)
                     return rc;
                 rc = put_entry(c->u.ibendport.dev_name, 1, len, fp);
                 if (rc)
                     return rc;
                 rc = context_write(p, &c->context[0], fp);
                 if (rc)
                     return rc;
                 break;
             }
         }
     }
     return 0;
 }
 
 static int genfs_write(struct policydb *p, void *fp)
 {
     struct genfs *genfs;
     struct ocontext *c;
     size_t len;
     __le32 buf[1];
     int rc;
 
     len = 0;
     for (genfs = p->genfs; genfs; genfs = genfs->next)
         len++;
     buf[0] = cpu_to_le32(len);
     rc = put_entry(buf, sizeof(u32), 1, fp);
     if (rc)
         return rc;
     for (genfs = p->genfs; genfs; genfs = genfs->next) {
         len = strlen(genfs->fstype);
         buf[0] = cpu_to_le32(len);
         rc = put_entry(buf, sizeof(u32), 1, fp);
         if (rc)
             return rc;
         rc = put_entry(genfs->fstype, 1, len, fp);
         if (rc)
             return rc;
         len = 0;
         for (c = genfs->head; c; c = c->next)
             len++;
         buf[0] = cpu_to_le32(len);
         rc = put_entry(buf, sizeof(u32), 1, fp);
         if (rc)
             return rc;
         for (c = genfs->head; c; c = c->next) {
             len = strlen(c->u.name);
             buf[0] = cpu_to_le32(len);
             rc = put_entry(buf, sizeof(u32), 1, fp);
             if (rc)
                 return rc;
             rc = put_entry(c->u.name, 1, len, fp);
             if (rc)
                 return rc;
             buf[0] = cpu_to_le32(c->v.sclass);
             rc = put_entry(buf, sizeof(u32), 1, fp);
             if (rc)
                 return rc;
             rc = context_write(p, &c->context[0], fp);
             if (rc)
                 return rc;
         }
     }
     return 0;
 }
 
 static int range_write_helper(void *key, void *data, void *ptr)
 {
     __le32 buf[2];
     struct range_trans *rt = key;
     struct mls_range *r = data;
     struct policy_data *pd = ptr;
     void *fp = pd->fp;
     struct policydb *p = pd->p;
     int rc;
 
     buf[0] = cpu_to_le32(rt->source_type);
     buf[1] = cpu_to_le32(rt->target_type);
     rc = put_entry(buf, sizeof(u32), 2, fp);
     if (rc)
         return rc;
     if (p->policyvers >= POLICYDB_VERSION_RANGETRANS) {
         buf[0] = cpu_to_le32(rt->target_class);
         rc = put_entry(buf, sizeof(u32), 1, fp);
         if (rc)
             return rc;
     }
     rc = mls_write_range_helper(r, fp);
     if (rc)
         return rc;
 
     return 0;
 }
 
 static int range_write(struct policydb *p, void *fp)
 {
     __le32 buf[1];
     int rc;
     struct policy_data pd;
 
     pd.p = p;
     pd.fp = fp;
 
     buf[0] = cpu_to_le32(p->range_tr.nel);
     rc = put_entry(buf, sizeof(u32), 1, fp);
     if (rc)
         return rc;
 
     /* actually write all of the entries */
     rc = hashtab_map(&p->range_tr, range_write_helper, &pd);
     if (rc)
         return rc;
 
     return 0;
 }
 
 static int filename_write_helper_compat(void *key, void *data, void *ptr)
 {
     struct filename_trans_key *ft = key;
     struct filename_trans_datum *datum = data;
     struct ebitmap_node *node;
     void *fp = ptr;
     __le32 buf[4];
     int rc;
     u32 bit, len = strlen(ft->name);
 
     do {
         ebitmap_for_each_positive_bit(&datum->stypes, node, bit) {
             buf[0] = cpu_to_le32(len);
             rc = put_entry(buf, sizeof(u32), 1, fp);
             if (rc)
                 return rc;
 
             rc = put_entry(ft->name, sizeof(char), len, fp);
             if (rc)
                 return rc;
 
             buf[0] = cpu_to_le32(bit + 1);
             buf[1] = cpu_to_le32(ft->ttype);
             buf[2] = cpu_to_le32(ft->tclass);
             buf[3] = cpu_to_le32(datum->otype);
 
             rc = put_entry(buf, sizeof(u32), 4, fp);
             if (rc)
                 return rc;
         }
 
         datum = datum->next;
     } while (unlikely(datum));
 
     return 0;
 }
 
 static int filename_write_helper(void *key, void *data, void *ptr)
 {
     struct filename_trans_key *ft = key;
     struct filename_trans_datum *datum;
     void *fp = ptr;
     __le32 buf[3];
     int rc;
     u32 ndatum, len = strlen(ft->name);
 
     buf[0] = cpu_to_le32(len);
     rc = put_entry(buf, sizeof(u32), 1, fp);
     if (rc)
         return rc;
 
     rc = put_entry(ft->name, sizeof(char), len, fp);
     if (rc)
         return rc;
 
     ndatum = 0;
     datum = data;
     do {
         ndatum++;
         datum = datum->next;
     } while (unlikely(datum));
 
     buf[0] = cpu_to_le32(ft->ttype);
     buf[1] = cpu_to_le32(ft->tclass);
     buf[2] = cpu_to_le32(ndatum);
     rc = put_entry(buf, sizeof(u32), 3, fp);
     if (rc)
         return rc;
 
     datum = data;
     do {
         rc = ebitmap_write(&datum->stypes, fp);
         if (rc)
             return rc;
 
         buf[0] = cpu_to_le32(datum->otype);
         rc = put_entry(buf, sizeof(u32), 1, fp);
         if (rc)
             return rc;
 
         datum = datum->next;
     } while (unlikely(datum));
 
     return 0;
 }
 
 static int filename_trans_write(struct policydb *p, void *fp)
 {
     __le32 buf[1];
     int rc;
 
     if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
         return 0;
 
     if (p->policyvers < POLICYDB_VERSION_COMP_FTRANS) {
         buf[0] = cpu_to_le32(p->compat_filename_trans_count);
         rc = put_entry(buf, sizeof(u32), 1, fp);
         if (rc)
             return rc;
 
         rc = hashtab_map(&p->filename_trans,
                  filename_write_helper_compat, fp);
     } else {
         buf[0] = cpu_to_le32(p->filename_trans.nel);
         rc = put_entry(buf, sizeof(u32), 1, fp);
         if (rc)
             return rc;
 
         rc = hashtab_map(&p->filename_trans, filename_write_helper, fp);
     }
     return rc;
 }
 
 /*
  * Write the configuration data in a policy database
  * structure to a policy database binary representation
  * file.
  */
 int policydb_write(struct policydb *p, void *fp)
 {
     unsigned int i, num_syms;
     int rc;
     __le32 buf[4];
     u32 config;
     size_t len;
     const struct policydb_compat_info *info;
 
     /*
      * refuse to write policy older than compressed avtab
      * to simplify the writer.  There are other tests dropped
      * since we assume this throughout the writer code.  Be
      * careful if you ever try to remove this restriction
      */
     if (p->policyvers < POLICYDB_VERSION_AVTAB) {
         pr_err("SELinux: refusing to write policy version %d."
                "  Because it is less than version %d\n", p->policyvers,
                POLICYDB_VERSION_AVTAB);
         return -EINVAL;
     }
 
     config = 0;
     if (p->mls_enabled)
         config |= POLICYDB_CONFIG_MLS;
 
     if (p->reject_unknown)
         config |= REJECT_UNKNOWN;
     if (p->allow_unknown)
         config |= ALLOW_UNKNOWN;
 
     /* Write the magic number and string identifiers. */
     buf[0] = cpu_to_le32(POLICYDB_MAGIC);
     len = strlen(POLICYDB_STRING);
     buf[1] = cpu_to_le32(len);
     rc = put_entry(buf, sizeof(u32), 2, fp);
     if (rc)
         return rc;
     rc = put_entry(POLICYDB_STRING, 1, len, fp);
     if (rc)
         return rc;
 
     /* Write the version, config, and table sizes. */
     info = policydb_lookup_compat(p->policyvers);
     if (!info) {
         pr_err("SELinux: compatibility lookup failed for policy "
             "version %d", p->policyvers);
         return -EINVAL;
     }
 
     buf[0] = cpu_to_le32(p->policyvers);
     buf[1] = cpu_to_le32(config);
     buf[2] = cpu_to_le32(info->sym_num);
     buf[3] = cpu_to_le32(info->ocon_num);
 
     rc = put_entry(buf, sizeof(u32), 4, fp);
     if (rc)
         return rc;
 
     if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
         rc = ebitmap_write(&p->policycaps, fp);
         if (rc)
             return rc;
     }
 
     if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
         rc = ebitmap_write(&p->permissive_map, fp);
         if (rc)
             return rc;
     }
 
     num_syms = info->sym_num;
     for (i = 0; i < num_syms; i++) {
         struct policy_data pd;
 
         pd.fp = fp;
         pd.p = p;
 
         buf[0] = cpu_to_le32(p->symtab[i].nprim);
         buf[1] = cpu_to_le32(p->symtab[i].table.nel);
 
         rc = put_entry(buf, sizeof(u32), 2, fp);
         if (rc)
             return rc;
         rc = hashtab_map(&p->symtab[i].table, write_f[i], &pd);
         if (rc)
             return rc;
     }
 
     rc = avtab_write(p, &p->te_avtab, fp);
     if (rc)
         return rc;
 
     rc = cond_write_list(p, fp);
     if (rc)
         return rc;
 
     rc = role_trans_write(p, fp);
     if (rc)
         return rc;
 
     rc = role_allow_write(p->role_allow, fp);
     if (rc)
         return rc;
 
     rc = filename_trans_write(p, fp);
     if (rc)
         return rc;
 
     rc = ocontext_write(p, info, fp);
     if (rc)
         return rc;
 
     rc = genfs_write(p, fp);
     if (rc)
         return rc;
 
     rc = range_write(p, fp);
     if (rc)
         return rc;
 
     for (i = 0; i < p->p_types.nprim; i++) {
         struct ebitmap *e = &p->type_attr_map_array[i];
 
         rc = ebitmap_write(e, fp);
         if (rc)
             return rc;
     }
 
     return 0;
 }