text: /*
   * 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
   *	This program is free software; you can redistribute it and/or modify
   *	it under the terms of the GNU General Public License as published by
   *	the Free Software Foundation, version 2.
   */
  
  #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 <linux/flex_array.h>
  #include "security.h"
  
  #include "policydb.h"
  #include "conditional.h"
  #include "mls.h"
  #include "services.h"
  
  #define _DEBUG_HASHES
  
  #ifdef DEBUG_HASHES
  static const char *symtab_name[SYM_NUM] = {
  	"common prefixes",
  	"classes",
  	"roles",
  	"types",
  	"users",
  	"bools",
  	"levels",
  	"categories",
  };
  #endif
  
  static unsigned int symtab_sizes[SYM_NUM] = {
  	2,
  	32,
  	16,
  	512,
  	128,
  	16,
  	16,
  	16,
  };
  
  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 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,
  	},
  };
  
  static struct policydb_compat_info *policydb_lookup_compat(int version)
  {
  	int i;
  	struct policydb_compat_info *info = NULL;
  
  	for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) {
  		if (policydb_compat[i].version == version) {
  			info = &policydb_compat[i];
  			break;
  		}
  	}
  	return info;
  }
  
  /*
   * 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 = hashtab_insert(p->p_roles.table, key, role);
  	if (rc)
  		goto out;
  
  	return 0;
  out:
  	kfree(key);
  	kfree(role);
  	return rc;
  }
  
  static u32 filenametr_hash(struct hashtab *h, const void *k)
  {
  	const struct filename_trans *ft = k;
  	unsigned long hash;
  	unsigned int byte_num;
  	unsigned char focus;
  
  	hash = ft->stype ^ ft->ttype ^ ft->tclass;
  
  	byte_num = 0;
  	while ((focus = ft->name[byte_num++]))
  		hash = partial_name_hash(focus, hash);
  	return hash & (h->size - 1);
  }
  
  static int filenametr_cmp(struct hashtab *h, const void *k1, const void *k2)
  {
  	const struct filename_trans *ft1 = k1;
  	const struct filename_trans *ft2 = k2;
  	int v;
  
  	v = ft1->stype - ft2->stype;
  	if (v)
  		return 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 u32 rangetr_hash(struct hashtab *h, const void *k)
  {
  	const struct range_trans *key = k;
  	return (key->source_type + (key->target_type << 3) +
  		(key->target_class << 5)) & (h->size - 1);
  }
  
  static int rangetr_cmp(struct hashtab *h, 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;
  }
  
  /*
   * Initialize a policy database structure.
   */
  static int policydb_init(struct policydb *p)
  {
  	int i, rc;
  
  	memset(p, 0, sizeof(*p));
  
  	for (i = 0; i < SYM_NUM; i++) {
  		rc = symtab_init(&p->symtab[i], symtab_sizes[i]);
  		if (rc)
  			goto out;
  	}
  
  	rc = avtab_init(&p->te_avtab);
  	if (rc)
  		goto out;
  
  	rc = roles_init(p);
  	if (rc)
  		goto out;
  
  	rc = cond_policydb_init(p);
  	if (rc)
  		goto out;
  
  	p->filename_trans = hashtab_create(filenametr_hash, filenametr_cmp, (1 << 10));
  	if (!p->filename_trans) {
  		rc = -ENOMEM;
  		goto out;
  	}
  
  	p->range_tr = hashtab_create(rangetr_hash, rangetr_cmp, 256);
  	if (!p->range_tr) {
  		rc = -ENOMEM;
  		goto out;
  	}
  
  	ebitmap_init(&p->filename_trans_ttypes);
  	ebitmap_init(&p->policycaps);
  	ebitmap_init(&p->permissive_map);
  
  	return 0;
  out:
  	hashtab_destroy(p->filename_trans);
  	hashtab_destroy(p->range_tr);
  	for (i = 0; i < SYM_NUM; i++)
  		hashtab_destroy(p->symtab[i].table);
  	return rc;
  }
  
  /*
   * 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;
  	struct flex_array *fa;
  
  	comdatum = datum;
  	p = datap;
  	if (!comdatum->value || comdatum->value > p->p_commons.nprim)
  		return -EINVAL;
  
  	fa = p->sym_val_to_name[SYM_COMMONS];
  	if (flex_array_put_ptr(fa, comdatum->value - 1, key,
  			       GFP_KERNEL | __GFP_ZERO))
  		BUG();
  	return 0;
  }
  
  static int class_index(void *key, void *datum, void *datap)
  {
  	struct policydb *p;
  	struct class_datum *cladatum;
  	struct flex_array *fa;
  
  	cladatum = datum;
  	p = datap;
  	if (!cladatum->value || cladatum->value > p->p_classes.nprim)
  		return -EINVAL;
  	fa = p->sym_val_to_name[SYM_CLASSES];
  	if (flex_array_put_ptr(fa, cladatum->value - 1, key,
  			       GFP_KERNEL | __GFP_ZERO))
  		BUG();
  	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;
  	struct flex_array *fa;
  
  	role = datum;
  	p = datap;
  	if (!role->value
  	    || role->value > p->p_roles.nprim
  	    || role->bounds > p->p_roles.nprim)
  		return -EINVAL;
  
  	fa = p->sym_val_to_name[SYM_ROLES];
  	if (flex_array_put_ptr(fa, role->value - 1, key,
  			       GFP_KERNEL | __GFP_ZERO))
  		BUG();
  	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;
  	struct flex_array *fa;
  
  	typdatum = datum;
  	p = datap;
  
  	if (typdatum->primary) {
  		if (!typdatum->value
  		    || typdatum->value > p->p_types.nprim
  		    || typdatum->bounds > p->p_types.nprim)
  			return -EINVAL;
  		fa = p->sym_val_to_name[SYM_TYPES];
  		if (flex_array_put_ptr(fa, typdatum->value - 1, key,
  				       GFP_KERNEL | __GFP_ZERO))
  			BUG();
  
  		fa = p->type_val_to_struct_array;
  		if (flex_array_put_ptr(fa, typdatum->value - 1, typdatum,
  				       GFP_KERNEL | __GFP_ZERO))
  			BUG();
  	}
  
  	return 0;
  }
  
  static int user_index(void *key, void *datum, void *datap)
  {
  	struct policydb *p;
  	struct user_datum *usrdatum;
  	struct flex_array *fa;
  
  	usrdatum = datum;
  	p = datap;
  	if (!usrdatum->value
  	    || usrdatum->value > p->p_users.nprim
  	    || usrdatum->bounds > p->p_users.nprim)
  		return -EINVAL;
  
  	fa = p->sym_val_to_name[SYM_USERS];
  	if (flex_array_put_ptr(fa, usrdatum->value - 1, key,
  			       GFP_KERNEL | __GFP_ZERO))
  		BUG();
  	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;
  	struct flex_array *fa;
  
  	levdatum = datum;
  	p = datap;
  
  	if (!levdatum->isalias) {
  		if (!levdatum->level->sens ||
  		    levdatum->level->sens > p->p_levels.nprim)
  			return -EINVAL;
  		fa = p->sym_val_to_name[SYM_LEVELS];
  		if (flex_array_put_ptr(fa, levdatum->level->sens - 1, key,
  				       GFP_KERNEL | __GFP_ZERO))
  			BUG();
  	}
  
  	return 0;
  }
  
  static int cat_index(void *key, void *datum, void *datap)
  {
  	struct policydb *p;
  	struct cat_datum *catdatum;
  	struct flex_array *fa;
  
  	catdatum = datum;
  	p = datap;
  
  	if (!catdatum->isalias) {
  		if (!catdatum->value || catdatum->value > p->p_cats.nprim)
  			return -EINVAL;
  		fa = p->sym_val_to_name[SYM_CATS];
  		if (flex_array_put_ptr(fa, catdatum->value - 1, key,
  				       GFP_KERNEL | __GFP_ZERO))
  			BUG();
  	}
  
  	return 0;
  }
  
  static int (*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);
  	printk(KERN_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, 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;
  
  	printk(KERN_DEBUG "SELinux:  %d users, %d roles, %d types, %d bools",
  	       p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim, p->p_bools.nprim);
  	if (p->mls_enabled)
  		printk(KERN_CONT ", %d sens, %d cats", p->p_levels.nprim,
  		       p->p_cats.nprim);
  	printk(KERN_CONT "\n");
  
  	printk(KERN_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;
  
  	/* Yes, I want the sizeof the pointer, not the structure */
  	p->type_val_to_struct_array = flex_array_alloc(sizeof(struct type_datum *),
  						       p->p_types.nprim,
  						       GFP_KERNEL | __GFP_ZERO);
  	if (!p->type_val_to_struct_array)
  		return -ENOMEM;
  
  	rc = flex_array_prealloc(p->type_val_to_struct_array, 0,
  				 p->p_types.nprim, GFP_KERNEL | __GFP_ZERO);
  	if (rc)
  		goto out;
  
  	rc = cond_init_bool_indexes(p);
  	if (rc)
  		goto out;
  
  	for (i = 0; i < SYM_NUM; i++) {
  		p->sym_val_to_name[i] = flex_array_alloc(sizeof(char *),
  							 p->symtab[i].nprim,
  							 GFP_KERNEL | __GFP_ZERO);
  		if (!p->sym_val_to_name[i])
  			return -ENOMEM;
  
  		rc = flex_array_prealloc(p->sym_val_to_name[i],
  					 0, p->symtab[i].nprim,
  					 GFP_KERNEL | __GFP_ZERO);
  		if (rc)
  			goto out;
  
  		rc = hashtab_map(p->symtab[i].table, index_f[i], p);
  		if (rc)
  			goto out;
  	}
  	rc = 0;
  out:
  	return rc;
  }
  
  /*
   * 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;
  		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 (*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 *ft = key;
  	kfree(ft->name);
  	kfree(key);
  	kfree(datum);
  	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 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);
  }
  
  /*
   * 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;
  	struct role_trans *tr, *ltr = 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++) {
  		if (p->sym_val_to_name[i])
  			flex_array_free(p->sym_val_to_name[i]);
  	}
  
  	kfree(p->class_val_to_struct);
  	kfree(p->role_val_to_struct);
  	kfree(p->user_val_to_struct);
  	if (p->type_val_to_struct_array)
  		flex_array_free(p->type_val_to_struct_array);
  
  	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);
  
  	for (tr = p->role_tr; tr; tr = tr->next) {
  		cond_resched();
  		kfree(ltr);
  		ltr = tr;
  	}
  	kfree(ltr);
  
  	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++) {
  			struct ebitmap *e;
  
  			e = flex_array_get(p->type_attr_map_array, i);
  			if (!e)
  				continue;
  			ebitmap_destroy(e);
  		}
  		flex_array_free(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) {
  		printk(KERN_ERR "SELinux:  out of memory on SID table init\n");
  		goto out;
  	}
  
  	head = p->ocontexts[OCON_ISID];
  	for (c = head; c; c = c->next) {
  		rc = -EINVAL;
  		if (!c->context[0].user) {
  			printk(KERN_ERR "SELinux:  SID %s was never defined.\n",
  				c->u.name);
  			goto out;
  		}
  
  		rc = sidtab_insert(s, c->sid[0], &c->context[0]);
  		if (rc) {
  			printk(KERN_ERR "SELinux:  unable to load initial SID %s.\n",
  				c->u.name);
  			goto out;
  		}
  	}
  	rc = 0;
  out:
  	return rc;
  }
  
  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)) {
  		printk(KERN_ERR "SELinux: mls:  range overflow\n");
  		goto out;
  	}
  
  	rc = next_entry(buf, fp, sizeof(u32) * items);
  	if (rc) {
  		printk(KERN_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) {
  		printk(KERN_ERR "SELinux: mls:  error reading low categories\n");
  		goto out;
  	}
  	if (items > 1) {
  		rc = ebitmap_read(&r->level[1].cat, fp);
  		if (rc) {
  			printk(KERN_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) {
  			printk(KERN_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) {
  		printk(KERN_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) {
  			printk(KERN_ERR "SELinux: error reading MLS range of context\n");
  			goto out;
  		}
  	}
  
  	rc = -EINVAL;
  	if (!policydb_context_isvalid(p, c)) {
  		printk(KERN_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;
  
  	/* it's expected the caller should free the str */
  	*strp = str;
  
  	rc = next_entry(str, fp, len);
  	if (rc)
  		return rc;
  
  	str[len] = '\0';
  	return 0;
  }
  
  static int perm_read(struct policydb *p, struct hashtab *h, 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 = hashtab_insert(h, key, perdatum);
  	if (rc)
  		goto bad;
  
  	return 0;
  bad:
  	perm_destroy(key, perdatum, NULL);
  	return rc;
  }
  
  static int common_read(struct policydb *p, struct hashtab *h, 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]);
  
  	rc = symtab_init(&comdatum->permissions, PERM_SYMTAB_SIZE);
  	if (rc)
  		goto bad;
  	comdatum->permissions.nprim = le32_to_cpu(buf[2]);
  	nel = le32_to_cpu(buf[3]);
  
  	rc = str_read(&key, GFP_KERNEL, fp, len);
  	if (rc)
  		goto bad;
  
  	for (i = 0; i < nel; i++) {
  		rc = perm_read(p, comdatum->permissions.table, fp);
  		if (rc)
  			goto bad;
  	}
  
  	rc = hashtab_insert(h, 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 hashtab *h, 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]);
  
  	rc = symtab_init(&cladatum->permissions, PERM_SYMTAB_SIZE);
  	if (rc)
  		goto bad;
  	cladatum->permissions.nprim = le32_to_cpu(buf[3]);
  	nel = le32_to_cpu(buf[4]);
  
  	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 = hashtab_search(p->p_commons.table, cladatum->comkey);
  		if (!cladatum->comdatum) {
  			printk(KERN_ERR "SELinux:  unknown common %s\n", cladatum->comkey);
  			goto bad;
  		}
  	}
  	for (i = 0; i < nel; i++) {
  		rc = perm_read(p, cladatum->permissions.table, 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 = hashtab_insert(h, key, cladatum);
  	if (rc)
  		goto bad;
  
  	return 0;
  bad:
  	cls_destroy(key, cladatum, NULL);
  	return rc;
  }
  
  static int role_read(struct policydb *p, struct hashtab *h, 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) {
  			printk(KERN_ERR "SELinux: Role %s has wrong value %d\n",
  			       OBJECT_R, role->value);
  			goto bad;
  		}
  		rc = 0;
  		goto bad;
  	}
  
  	rc = hashtab_insert(h, key, role);
  	if (rc)
  		goto bad;
  	return 0;
  bad:
  	role_destroy(key, role, NULL);
  	return rc;
  }
  
  static int type_read(struct policydb *p, struct hashtab *h, 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 = hashtab_insert(h, 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) {
  		printk(KERN_ERR "SELinux: mls: truncated level\n");
  		return rc;
  	}
  	lp->sens = le32_to_cpu(buf[0]);
  
  	rc = ebitmap_read(&lp->cat, fp);
  	if (rc) {
  		printk(KERN_ERR "SELinux: mls:  error reading level categories\n");
  		return rc;
  	}
  	return 0;
  }
  
  static int user_read(struct policydb *p, struct hashtab *h, 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 = hashtab_insert(h, key, usrdatum);
  	if (rc)
  		goto bad;
  	return 0;
  bad:
  	user_destroy(key, usrdatum, NULL);
  	return rc;
  }
  
  static int sens_read(struct policydb *p, struct hashtab *h, 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 = hashtab_insert(h, key, levdatum);
  	if (rc)
  		goto bad;
  	return 0;
  bad:
  	sens_destroy(key, levdatum, NULL);
  	return rc;
  }
  
  static int cat_read(struct policydb *p, struct hashtab *h, 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 = hashtab_insert(h, key, catdatum);
  	if (rc)
  		goto bad;
  	return 0;
  bad:
  	cat_destroy(key, catdatum, NULL);
  	return rc;
  }
  
  static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, 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) {
  			printk(KERN_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;
  
  			printk(KERN_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) {
  			printk(KERN_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;
  
  			printk(KERN_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) {
  			printk(KERN_ERR "SELinux: type %s: "
  			       "too deep or looped boundary\n",
  			       (char *) key);
  			return -EINVAL;
  		}
  
  		upper = flex_array_get_ptr(p->type_val_to_struct_array,
  					   upper->bounds - 1);
  		BUG_ON(!upper);
  
  		if (upper->attribute) {
  			printk(KERN_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 = hashtab_search(p->p_classes.table, 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 = hashtab_search(comdatum->permissions.table,
  					  name);
  	if (!perdatum)
  		perdatum = hashtab_search(cladatum->permissions.table,
  					  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]);
  	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)) {
  			printk(KERN_WARNING "SELinux:  rangetrans:  invalid range\n");
  			goto out;
  		}
  
  		rc = hashtab_insert(p->range_tr, rt, r);
  		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(struct policydb *p, void *fp)
  {
  	struct filename_trans *ft;
  	struct filename_trans_datum *otype;
  	char *name;
  	u32 nel, len;
  	__le32 buf[4];
  	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]);
  
  	for (i = 0; i < nel; i++) {
  		otype = NULL;
  		name = NULL;
  
  		rc = -ENOMEM;
  		ft = kzalloc(sizeof(*ft), GFP_KERNEL);
  		if (!ft)
  			goto out;
  
  		rc = -ENOMEM;
  		otype = kmalloc(sizeof(*otype), GFP_KERNEL);
  		if (!otype)
  			goto out;
  
  		/* length of the path component string */
  		rc = next_entry(buf, fp, sizeof(u32));
  		if (rc)
  			goto out;
  		len = le32_to_cpu(buf[0]);
  
  		/* path component string */
  		rc = str_read(&name, GFP_KERNEL, fp, len);
  		if (rc)
  			goto out;
  
  		ft->name = name;
  
  		rc = next_entry(buf, fp, sizeof(u32) * 4);
  		if (rc)
  			goto out;
  
  		ft->stype = le32_to_cpu(buf[0]);
  		ft->ttype = le32_to_cpu(buf[1]);
  		ft->tclass = le32_to_cpu(buf[2]);
  
  		otype->otype = le32_to_cpu(buf[3]);
  
  		rc = ebitmap_set_bit(&p->filename_trans_ttypes, ft->ttype, 1);
  		if (rc)
  			goto out;
  
  		rc = hashtab_insert(p->filename_trans, ft, otype);
  		if (rc) {
  			/*
  			 * Do not return -EEXIST to the caller, or the system
  			 * will not boot.
  			 */
  			if (rc != -EEXIST)
  				goto out;
  			/* But free memory to avoid memory leak. */
  			kfree(ft);
  			kfree(name);
  			kfree(otype);
  		}
  	}
  	hash_eval(p->filename_trans, "filenametr");
  	return 0;
  out:
  	kfree(ft);
  	kfree(name);
  	kfree(otype);
  
  	return rc;
  }
  
  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) {
  				printk(KERN_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)) {
  					printk(KERN_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, struct policydb_compat_info *info,
  			 void *fp)
  {
  	int i, j, rc;
  	u32 nel, len;
  	__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:
  				rc = next_entry(nodebuf, fp, sizeof(u32) * 4);
  				if (rc)
  					goto out;
  
  				c->u.ibpkey.subnet_prefix = be64_to_cpu(*((__be64 *)nodebuf));
  
  				if (nodebuf[2] > 0xffff ||
  				    nodebuf[3] > 0xffff) {
  					rc = -EINVAL;
  					goto out;
  				}
  
  				c->u.ibpkey.low_pkey = le32_to_cpu(nodebuf[2]);
  				c->u.ibpkey.high_pkey = le32_to_cpu(nodebuf[3]);
  
  				rc = context_read_and_validate(&c->context[0],
  							       p,
  							       fp);
  				if (rc)
  					goto out;
  				break;
  			case OCON_IBENDPORT:
  				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;
  
  				if (buf[1] > 0xff || buf[1] == 0) {
  					rc = -EINVAL;
  					goto out;
  				}
  
  				c->u.ibendport.port = le32_to_cpu(buf[1]);
  
  				rc = context_read_and_validate(&c->context[0],
  							       p,
  							       fp);
  				if (rc)
  					goto out;
  				break;
  			}
  		}
  	}
  	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 *tr, *ltr;
  	int i, j, rc;
  	__le32 buf[4];
  	u32 len, nprim, nel;
  
  	char *policydb_str;
  	struct policydb_compat_info *info;
  
  	rc = policydb_init(p);
  	if (rc)
  		return rc;
  
  	/* 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) {
  		printk(KERN_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)) {
  		printk(KERN_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) {
  		printk(KERN_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) {
  		printk(KERN_ERR "SELinux:  truncated policydb string identifier\n");
  		kfree(policydb_str);
  		goto bad;
  	}
  
  	rc = -EINVAL;
  	policydb_str[len] = '\0';
  	if (strcmp(policydb_str, POLICYDB_STRING)) {
  		printk(KERN_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) {
  		printk(KERN_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) {
  			printk(KERN_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) {
  		printk(KERN_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) {
  		printk(KERN_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]);
  		for (j = 0; j < nel; j++) {
  			rc = read_f[i](p, p->symtab[i].table, 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)
  		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]);
  	ltr = NULL;
  	for (i = 0; i < nel; i++) {
  		rc = -ENOMEM;
  		tr = kzalloc(sizeof(*tr), GFP_KERNEL);
  		if (!tr)
  			goto bad;
  		if (ltr)
  			ltr->next = tr;
  		else
  			p->role_tr = tr;
  		rc = next_entry(buf, fp, sizeof(u32)*3);
  		if (rc)
  			goto bad;
  
  		rc = -EINVAL;
  		tr->role = le32_to_cpu(buf[0]);
  		tr->type = le32_to_cpu(buf[1]);
  		tr->new_role = le32_to_cpu(buf[2]);
  		if (p->policyvers >= POLICYDB_VERSION_ROLETRANS) {
  			rc = next_entry(buf, fp, sizeof(u32));
  			if (rc)
  				goto bad;
  			tr->tclass = le32_to_cpu(buf[0]);
  		} else
  			tr->tclass = p->process_class;
  
  		rc = -EINVAL;
  		if (!policydb_role_isvalid(p, tr->role) ||
  		    !policydb_type_isvalid(p, tr->type) ||
  		    !policydb_class_isvalid(p, tr->tclass) ||
  		    !policydb_role_isvalid(p, tr->new_role))
  			goto bad;
  		ltr = tr;
  	}
  
  	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;
  	p->process_trans_perms = string_to_av_perm(p, p->process_class, "transition");
  	p->process_trans_perms |= string_to_av_perm(p, p->process_class, "dyntransition");
  	if (!p->process_trans_perms)
  		goto bad;
  
  	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 = flex_array_alloc(sizeof(struct ebitmap),
  						  p->p_types.nprim,
  						  GFP_KERNEL | __GFP_ZERO);
  	if (!p->type_attr_map_array)
  		goto bad;
  
  	/* preallocate so we don't have to worry about the put ever failing */
  	rc = flex_array_prealloc(p->type_attr_map_array, 0, p->p_types.nprim,
  				 GFP_KERNEL | __GFP_ZERO);
  	if (rc)
  		goto bad;
  
  	for (i = 0; i < p->p_types.nprim; i++) {
  		struct ebitmap *e = flex_array_get(p->type_attr_map_array, i);
  
  		BUG_ON(!e);
  		ebitmap_init(e);
  		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:
  	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(struct policydb *p, void *fp)
  {
  	struct role_trans *r = p->role_tr;
  	struct role_trans *tr;
  	u32 buf[3];
  	size_t nel;
  	int rc;
  
  	nel = 0;
  	for (tr = r; tr; tr = tr->next)
  		nel++;
  	buf[0] = cpu_to_le32(nel);
  	rc = put_entry(buf, sizeof(u32), 1, fp);
  	if (rc)
  		return rc;
  	for (tr = r; tr; tr = tr->next) {
  		buf[0] = cpu_to_le32(tr->role);
  		buf[1] = cpu_to_le32(tr->type);
  		buf[2] = cpu_to_le32(tr->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(tr->tclass);
  			rc = put_entry(buf, sizeof(u32), 1, fp);
  			if (rc)
  				return rc;
  		}
  	}
  
  	return 0;
  }
  
  static int role_allow_write(struct role_allow *r, void *fp)
  {
  	struct role_allow *ra;
  	u32 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);
  	if (cladatum->permissions.table)
  		buf[4] = cpu_to_le32(cladatum->permissions.table->nel);
  	else
  		buf[4] = 0;
  	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 (*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, struct policydb_compat_info *info,
  			  void *fp)
  {
  	unsigned int i, j, rc;
  	size_t nel, len;
  	__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:
  				*((__be64 *)nodebuf) = cpu_to_be64(c->u.ibpkey.subnet_prefix);
  
  				nodebuf[2] = cpu_to_le32(c->u.ibpkey.low_pkey);
  				nodebuf[3] = cpu_to_le32(c->u.ibpkey.high_pkey);
  
  				rc = put_entry(nodebuf, sizeof(u32), 4, 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 hashtab_cnt(void *key, void *data, void *ptr)
  {
  	int *cnt = ptr;
  	*cnt = *cnt + 1;
  
  	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, nel;
  	struct policy_data pd;
  
  	pd.p = p;
  	pd.fp = fp;
  
  	/* count the number of entries in the hashtab */
  	nel = 0;
  	rc = hashtab_map(p->range_tr, hashtab_cnt, &nel);
  	if (rc)
  		return rc;
  
  	buf[0] = cpu_to_le32(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(void *key, void *data, void *ptr)
  {
  	__le32 buf[4];
  	struct filename_trans *ft = key;
  	struct filename_trans_datum *otype = data;
  	void *fp = ptr;
  	int rc;
  	u32 len;
  
  	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;
  
  	buf[0] = cpu_to_le32(ft->stype);
  	buf[1] = cpu_to_le32(ft->ttype);
  	buf[2] = cpu_to_le32(ft->tclass);
  	buf[3] = cpu_to_le32(otype->otype);
  
  	rc = put_entry(buf, sizeof(u32), 4, fp);
  	if (rc)
  		return rc;
  
  	return 0;
  }
  
  static int filename_trans_write(struct policydb *p, void *fp)
  {
  	u32 nel;
  	__le32 buf[1];
  	int rc;
  
  	if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
  		return 0;
  
  	nel = 0;
  	rc = hashtab_map(p->filename_trans, hashtab_cnt, &nel);
  	if (rc)
  		return rc;
  
  	buf[0] = cpu_to_le32(nel);
  	rc = put_entry(buf, sizeof(u32), 1, fp);
  	if (rc)
  		return rc;
  
  	rc = hashtab_map(p->filename_trans, filename_write_helper, fp);
  	if (rc)
  		return rc;
  
  	return 0;
  }
  
  /*
   * 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;
  	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) {
  		printk(KERN_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) {
  		printk(KERN_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, p->cond_list, 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 = flex_array_get(p->type_attr_map_array, i);
  
  		BUG_ON(!e);
  		rc = ebitmap_write(e, fp);
  		if (rc)
  			return rc;
  	}
  
  	return 0;
  }
  