policydb.c 69.7 KB
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/*
 * Implementation of the policy database.
 *
 * Author : Stephen Smalley, <sds@epoch.ncsc.mil>
 */

/*
 * 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>
 *
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 *	Added conditional policy language extensions
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 *
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 * Updated: Hewlett-Packard <paul@paul-moore.com>
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 *
 *      Added support for the policy capability bitmap
 *
 * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
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 * 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
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 *	it under the terms of the GNU General Public License as published by
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 *	the Free Software Foundation, version 2.
 */

#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
#include <linux/string.h>
#include <linux/errno.h>
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#include <linux/audit.h>
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#include <linux/flex_array.h>
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#include "security.h"

#include "policydb.h"
#include "conditional.h"
#include "mls.h"
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#include "services.h"
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#define _DEBUG_HASHES

#ifdef DEBUG_HASHES
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static const char *symtab_name[SYM_NUM] = {
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	"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[] = {
	{
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		.version	= POLICYDB_VERSION_BASE,
		.sym_num	= SYM_NUM - 3,
		.ocon_num	= OCON_NUM - 1,
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	},
	{
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		.version	= POLICYDB_VERSION_BOOL,
		.sym_num	= SYM_NUM - 2,
		.ocon_num	= OCON_NUM - 1,
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	},
	{
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		.version	= POLICYDB_VERSION_IPV6,
		.sym_num	= SYM_NUM - 2,
		.ocon_num	= OCON_NUM,
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	},
	{
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		.version	= POLICYDB_VERSION_NLCLASS,
		.sym_num	= SYM_NUM - 2,
		.ocon_num	= OCON_NUM,
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	},
	{
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		.version	= POLICYDB_VERSION_MLS,
		.sym_num	= SYM_NUM,
		.ocon_num	= OCON_NUM,
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	},
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	{
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		.version	= POLICYDB_VERSION_AVTAB,
		.sym_num	= SYM_NUM,
		.ocon_num	= OCON_NUM,
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	},
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	{
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		.version	= POLICYDB_VERSION_RANGETRANS,
		.sym_num	= SYM_NUM,
		.ocon_num	= OCON_NUM,
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	},
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	{
		.version	= POLICYDB_VERSION_POLCAP,
		.sym_num	= SYM_NUM,
		.ocon_num	= OCON_NUM,
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	},
	{
		.version	= POLICYDB_VERSION_PERMISSIVE,
		.sym_num	= SYM_NUM,
		.ocon_num	= OCON_NUM,
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	},
	{
		.version	= POLICYDB_VERSION_BOUNDARY,
		.sym_num	= SYM_NUM,
		.ocon_num	= OCON_NUM,
	},
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	{
		.version	= POLICYDB_VERSION_FILENAME_TRANS,
		.sym_num	= SYM_NUM,
		.ocon_num	= OCON_NUM,
	},
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	{
		.version	= POLICYDB_VERSION_ROLETRANS,
		.sym_num	= SYM_NUM,
		.ocon_num	= OCON_NUM,
	},
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	{
		.version	= POLICYDB_VERSION_NEW_OBJECT_DEFAULTS,
		.sym_num	= SYM_NUM,
		.ocon_num	= OCON_NUM,
	},
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	{
		.version	= POLICYDB_VERSION_DEFAULT_TYPE,
		.sym_num	= SYM_NUM,
		.ocon_num	= OCON_NUM,
	},
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	{
		.version	= POLICYDB_VERSION_CONSTRAINT_NAMES,
		.sym_num	= SYM_NUM,
		.ocon_num	= OCON_NUM,
	},
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	{
		.version	= POLICYDB_VERSION_XPERMS_IOCTL,
		.sym_num	= SYM_NUM,
		.ocon_num	= OCON_NUM,
	},
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};

static struct policydb_compat_info *policydb_lookup_compat(int version)
{
	int i;
	struct policydb_compat_info *info = NULL;

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	for (i = 0; i < ARRAY_SIZE(policydb_compat); i++) {
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		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;

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	rc = -ENOMEM;
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	role = kzalloc(sizeof(*role), GFP_KERNEL);
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	if (!role)
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		goto out;
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	rc = -EINVAL;
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	role->value = ++p->p_roles.nprim;
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	if (role->value != OBJECT_R_VAL)
		goto out;

	rc = -ENOMEM;
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	key = kstrdup(OBJECT_R, GFP_KERNEL);
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	if (!key)
		goto out;

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	rc = hashtab_insert(p->p_roles.table, key, role);
	if (rc)
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		goto out;
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	return 0;
out:
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	kfree(key);
	kfree(role);
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	return rc;
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}

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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);

}

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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;
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	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;
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}

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/*
 * 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)
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			goto out;
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	}

	rc = avtab_init(&p->te_avtab);
	if (rc)
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		goto out;
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	rc = roles_init(p);
	if (rc)
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		goto out;
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	rc = cond_policydb_init(p);
	if (rc)
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		goto out;
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	p->filename_trans = hashtab_create(filenametr_hash, filenametr_cmp, (1 << 10));
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	if (!p->filename_trans) {
		rc = -ENOMEM;
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		goto out;
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	}
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	p->range_tr = hashtab_create(rangetr_hash, rangetr_cmp, 256);
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	if (!p->range_tr) {
		rc = -ENOMEM;
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		goto out;
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	}
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	ebitmap_init(&p->filename_trans_ttypes);
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	ebitmap_init(&p->policycaps);
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	ebitmap_init(&p->permissive_map);
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	return 0;
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out:
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	hashtab_destroy(p->filename_trans);
	hashtab_destroy(p->range_tr);
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	for (i = 0; i < SYM_NUM; i++)
		hashtab_destroy(p->symtab[i].table);
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	return rc;
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}

/*
 * 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;
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	struct flex_array *fa;
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	comdatum = datum;
	p = datap;
	if (!comdatum->value || comdatum->value > p->p_commons.nprim)
		return -EINVAL;
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	fa = p->sym_val_to_name[SYM_COMMONS];
	if (flex_array_put_ptr(fa, comdatum->value - 1, key,
			       GFP_KERNEL | __GFP_ZERO))
		BUG();
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	return 0;
}

static int class_index(void *key, void *datum, void *datap)
{
	struct policydb *p;
	struct class_datum *cladatum;
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	struct flex_array *fa;
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	cladatum = datum;
	p = datap;
	if (!cladatum->value || cladatum->value > p->p_classes.nprim)
		return -EINVAL;
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	fa = p->sym_val_to_name[SYM_CLASSES];
	if (flex_array_put_ptr(fa, cladatum->value - 1, key,
			       GFP_KERNEL | __GFP_ZERO))
		BUG();
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	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;
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	struct flex_array *fa;
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	role = datum;
	p = datap;
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	if (!role->value
	    || role->value > p->p_roles.nprim
	    || role->bounds > p->p_roles.nprim)
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		return -EINVAL;
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	fa = p->sym_val_to_name[SYM_ROLES];
	if (flex_array_put_ptr(fa, role->value - 1, key,
			       GFP_KERNEL | __GFP_ZERO))
		BUG();
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	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;
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	struct flex_array *fa;
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	typdatum = datum;
	p = datap;

	if (typdatum->primary) {
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		if (!typdatum->value
		    || typdatum->value > p->p_types.nprim
		    || typdatum->bounds > p->p_types.nprim)
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			return -EINVAL;
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		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,
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				       GFP_KERNEL | __GFP_ZERO))
			BUG();
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	}

	return 0;
}

static int user_index(void *key, void *datum, void *datap)
{
	struct policydb *p;
	struct user_datum *usrdatum;
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	struct flex_array *fa;
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	usrdatum = datum;
	p = datap;
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	if (!usrdatum->value
	    || usrdatum->value > p->p_users.nprim
	    || usrdatum->bounds > p->p_users.nprim)
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		return -EINVAL;
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	fa = p->sym_val_to_name[SYM_USERS];
	if (flex_array_put_ptr(fa, usrdatum->value - 1, key,
			       GFP_KERNEL | __GFP_ZERO))
		BUG();
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	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;
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	struct flex_array *fa;
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	levdatum = datum;
	p = datap;

	if (!levdatum->isalias) {
		if (!levdatum->level->sens ||
		    levdatum->level->sens > p->p_levels.nprim)
			return -EINVAL;
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		fa = p->sym_val_to_name[SYM_LEVELS];
		if (flex_array_put_ptr(fa, levdatum->level->sens - 1, key,
				       GFP_KERNEL | __GFP_ZERO))
			BUG();
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	}

	return 0;
}

static int cat_index(void *key, void *datum, void *datap)
{
	struct policydb *p;
	struct cat_datum *catdatum;
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	struct flex_array *fa;
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	catdatum = datum;
	p = datap;

	if (!catdatum->isalias) {
		if (!catdatum->value || catdatum->value > p->p_cats.nprim)
			return -EINVAL;
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		fa = p->sym_val_to_name[SYM_CATS];
		if (flex_array_put_ptr(fa, catdatum->value - 1, key,
				       GFP_KERNEL | __GFP_ZERO))
			BUG();
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	}

	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
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static void hash_eval(struct hashtab *h, const char *hash_name)
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{
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	struct hashtab_info info;
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	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);
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}
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static void symtab_hash_eval(struct symtab *s)
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{
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	int i;
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	for (i = 0; i < SYM_NUM; i++)
		hash_eval(s[i].table, symtab_name[i]);
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}
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#else
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static inline void hash_eval(struct hashtab *h, char *hash_name)
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{
}
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#endif

/*
 * Define the other val_to_name and val_to_struct arrays
 * in a policy database structure.
 *
 * Caller must clean up on failure.
 */
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static int policydb_index(struct policydb *p)
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{
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	int i, rc;
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	printk(KERN_DEBUG "SELinux:  %d users, %d roles, %d types, %d bools",
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	       p->p_users.nprim, p->p_roles.nprim, p->p_types.nprim, p->p_bools.nprim);
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	if (p->mls_enabled)
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		printk(KERN_CONT ", %d sens, %d cats", p->p_levels.nprim,
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		       p->p_cats.nprim);
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	printk(KERN_CONT "\n");
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	printk(KERN_DEBUG "SELinux:  %d classes, %d rules\n",
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	       p->p_classes.nprim, p->te_avtab.nel);

#ifdef DEBUG_HASHES
	avtab_hash_eval(&p->te_avtab, "rules");
	symtab_hash_eval(p->symtab);
#endif

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	rc = -ENOMEM;
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	p->class_val_to_struct = kcalloc(p->p_classes.nprim,
					 sizeof(*p->class_val_to_struct),
					 GFP_KERNEL);
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	if (!p->class_val_to_struct)
		goto out;

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	rc = -ENOMEM;
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	p->role_val_to_struct = kcalloc(p->p_roles.nprim,
					sizeof(*p->role_val_to_struct),
					GFP_KERNEL);
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	if (!p->role_val_to_struct)
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		goto out;

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	rc = -ENOMEM;
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	p->user_val_to_struct = kcalloc(p->p_users.nprim,
					sizeof(*p->user_val_to_struct),
					GFP_KERNEL);
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	if (!p->user_val_to_struct)
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		goto out;

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	/* Yes, I want the sizeof the pointer, not the structure */
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	rc = -ENOMEM;
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	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)
		goto out;

	rc = flex_array_prealloc(p->type_val_to_struct_array, 0,
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				 p->p_types.nprim, GFP_KERNEL | __GFP_ZERO);
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	if (rc)
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		goto out;

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	rc = cond_init_bool_indexes(p);
	if (rc)
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		goto out;

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	for (i = 0; i < SYM_NUM; i++) {
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		rc = -ENOMEM;
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		p->sym_val_to_name[i] = flex_array_alloc(sizeof(char *),
							 p->symtab[i].nprim,
							 GFP_KERNEL | __GFP_ZERO);
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		if (!p->sym_val_to_name[i])
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			goto out;
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		rc = flex_array_prealloc(p->sym_val_to_name[i],
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					 0, p->symtab[i].nprim,
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					 GFP_KERNEL | __GFP_ZERO);
		if (rc)
			goto out;

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		rc = hashtab_map(p->symtab[i].table, index_f[i], p);
		if (rc)
			goto out;
	}
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	rc = 0;
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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);
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	if (datum) {
		comdatum = datum;
		hashtab_map(comdatum->permissions.table, perm_destroy, NULL);
		hashtab_destroy(comdatum->permissions.table);
	}
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	kfree(datum);
	return 0;
}

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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);
	}
}

643
static int cls_destroy(void *key, void *datum, void *p)
L
Linus Torvalds 已提交
644 645 646 647 648 649
{
	struct class_datum *cladatum;
	struct constraint_node *constraint, *ctemp;
	struct constraint_expr *e, *etmp;

	kfree(key);
650 651 652 653 654 655 656 657 658 659
	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;
660
				constraint_expr_destroy(etmp);
661 662 663 664
			}
			ctemp = constraint;
			constraint = constraint->next;
			kfree(ctemp);
L
Linus Torvalds 已提交
665
		}
666 667 668 669 670 671 672

		constraint = cladatum->validatetrans;
		while (constraint) {
			e = constraint->expr;
			while (e) {
				etmp = e;
				e = e->next;
673
				constraint_expr_destroy(etmp);
674 675 676 677
			}
			ctemp = constraint;
			constraint = constraint->next;
			kfree(ctemp);
L
Linus Torvalds 已提交
678
		}
679 680
		kfree(cladatum->comkey);
	}
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	kfree(datum);
	return 0;
}

static int role_destroy(void *key, void *datum, void *p)
{
	struct role_datum *role;

	kfree(key);
690 691 692 693 694
	if (datum) {
		role = datum;
		ebitmap_destroy(&role->dominates);
		ebitmap_destroy(&role->types);
	}
L
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695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710
	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);
711 712 713 714 715 716 717
	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);
	}
L
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	kfree(datum);
	return 0;
}

static int sens_destroy(void *key, void *datum, void *p)
{
	struct level_datum *levdatum;

	kfree(key);
727 728 729 730 731
	if (datum) {
		levdatum = datum;
		ebitmap_destroy(&levdatum->level->cat);
		kfree(levdatum->level);
	}
L
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732 733 734 735 736 737 738 739 740 741 742 743 744 745
	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,
746
	cls_destroy,
L
Linus Torvalds 已提交
747 748 749 750 751 752 753 754
	role_destroy,
	type_destroy,
	user_destroy,
	cond_destroy_bool,
	sens_destroy,
	cat_destroy,
};

755 756 757 758 759 760 761 762 763 764
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;
}

765 766 767 768 769 770 771 772 773 774 775
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;
}

L
Linus Torvalds 已提交
776 777
static void ocontext_destroy(struct ocontext *c, int i)
{
778 779 780
	if (!c)
		return;

L
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781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796
	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;
797 798
	struct role_allow *ra, *lra = NULL;
	struct role_trans *tr, *ltr = NULL;
L
Linus Torvalds 已提交
799 800

	for (i = 0; i < SYM_NUM; i++) {
801
		cond_resched();
L
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802 803 804 805
		hashtab_map(p->symtab[i].table, destroy_f[i], NULL);
		hashtab_destroy(p->symtab[i].table);
	}

806 807 808 809
	for (i = 0; i < SYM_NUM; i++) {
		if (p->sym_val_to_name[i])
			flex_array_free(p->sym_val_to_name[i]);
	}
L
Linus Torvalds 已提交
810

J
Jesper Juhl 已提交
811 812 813
	kfree(p->class_val_to_struct);
	kfree(p->role_val_to_struct);
	kfree(p->user_val_to_struct);
814 815
	if (p->type_val_to_struct_array)
		flex_array_free(p->type_val_to_struct_array);
L
Linus Torvalds 已提交
816 817 818 819

	avtab_destroy(&p->te_avtab);

	for (i = 0; i < OCON_NUM; i++) {
820
		cond_resched();
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		c = p->ocontexts[i];
		while (c) {
			ctmp = c;
			c = c->next;
825
			ocontext_destroy(ctmp, i);
L
Linus Torvalds 已提交
826
		}
827
		p->ocontexts[i] = NULL;
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828 829 830 831
	}

	g = p->genfs;
	while (g) {
832
		cond_resched();
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833 834 835 836 837
		kfree(g->fstype);
		c = g->head;
		while (c) {
			ctmp = c;
			c = c->next;
838
			ocontext_destroy(ctmp, OCON_FSUSE);
L
Linus Torvalds 已提交
839 840 841 842 843
		}
		gtmp = g;
		g = g->next;
		kfree(gtmp);
	}
844
	p->genfs = NULL;
L
Linus Torvalds 已提交
845 846 847

	cond_policydb_destroy(p);

848
	for (tr = p->role_tr; tr; tr = tr->next) {
849
		cond_resched();
J
Jesper Juhl 已提交
850
		kfree(ltr);
851 852
		ltr = tr;
	}
J
Jesper Juhl 已提交
853
	kfree(ltr);
854

855
	for (ra = p->role_allow; ra; ra = ra->next) {
856
		cond_resched();
J
Jesper Juhl 已提交
857
		kfree(lra);
858 859
		lra = ra;
	}
J
Jesper Juhl 已提交
860
	kfree(lra);
861

862 863 864
	hashtab_map(p->filename_trans, filenametr_destroy, NULL);
	hashtab_destroy(p->filename_trans);

865 866
	hashtab_map(p->range_tr, range_tr_destroy, NULL);
	hashtab_destroy(p->range_tr);
867

868 869 870 871 872 873 874 875 876 877
	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);
878
	}
879

880
	ebitmap_destroy(&p->filename_trans_ttypes);
881
	ebitmap_destroy(&p->policycaps);
E
Eric Paris 已提交
882
	ebitmap_destroy(&p->permissive_map);
L
Linus Torvalds 已提交
883 884 885 886 887 888 889 890 891 892 893 894 895
}

/*
 * 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) {
J
James Morris 已提交
896
		printk(KERN_ERR "SELinux:  out of memory on SID table init\n");
L
Linus Torvalds 已提交
897 898 899 900 901
		goto out;
	}

	head = p->ocontexts[OCON_ISID];
	for (c = head; c; c = c->next) {
902
		rc = -EINVAL;
L
Linus Torvalds 已提交
903
		if (!c->context[0].user) {
904 905
			printk(KERN_ERR "SELinux:  SID %s was never defined.\n",
				c->u.name);
L
Linus Torvalds 已提交
906 907
			goto out;
		}
908 909 910 911 912

		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);
L
Linus Torvalds 已提交
913 914 915
			goto out;
		}
	}
916
	rc = 0;
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917 918 919 920
out:
	return rc;
}

921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941
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;
}

L
Linus Torvalds 已提交
942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964
/*
 * 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];
W
William Roberts 已提交
965
		if (!role || !ebitmap_get_bit(&role->types, c->type - 1))
L
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966 967 968 969 970 971 972 973 974 975
			/* 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;

976
		if (!ebitmap_get_bit(&usrdatum->roles, c->role - 1))
L
Linus Torvalds 已提交
977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992
			/* 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)
{
993 994
	__le32 buf[2];
	u32 items;
L
Linus Torvalds 已提交
995 996 997
	int rc;

	rc = next_entry(buf, fp, sizeof(u32));
998
	if (rc)
L
Linus Torvalds 已提交
999 1000
		goto out;

1001
	rc = -EINVAL;
L
Linus Torvalds 已提交
1002 1003
	items = le32_to_cpu(buf[0]);
	if (items > ARRAY_SIZE(buf)) {
J
James Morris 已提交
1004
		printk(KERN_ERR "SELinux: mls:  range overflow\n");
L
Linus Torvalds 已提交
1005 1006
		goto out;
	}
1007

L
Linus Torvalds 已提交
1008
	rc = next_entry(buf, fp, sizeof(u32) * items);
1009
	if (rc) {
J
James Morris 已提交
1010
		printk(KERN_ERR "SELinux: mls:  truncated range\n");
L
Linus Torvalds 已提交
1011 1012
		goto out;
	}
1013

L
Linus Torvalds 已提交
1014 1015 1016 1017 1018 1019 1020 1021
	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) {
1022
		printk(KERN_ERR "SELinux: mls:  error reading low categories\n");
L
Linus Torvalds 已提交
1023 1024 1025 1026 1027
		goto out;
	}
	if (items > 1) {
		rc = ebitmap_read(&r->level[1].cat, fp);
		if (rc) {
1028
			printk(KERN_ERR "SELinux: mls:  error reading high categories\n");
L
Linus Torvalds 已提交
1029 1030 1031 1032 1033
			goto bad_high;
		}
	} else {
		rc = ebitmap_cpy(&r->level[1].cat, &r->level[0].cat);
		if (rc) {
J
James Morris 已提交
1034
			printk(KERN_ERR "SELinux: mls:  out of memory\n");
L
Linus Torvalds 已提交
1035 1036 1037 1038
			goto bad_high;
		}
	}

1039
	return 0;
L
Linus Torvalds 已提交
1040 1041
bad_high:
	ebitmap_destroy(&r->level[0].cat);
1042 1043
out:
	return rc;
L
Linus Torvalds 已提交
1044 1045 1046 1047 1048 1049 1050 1051 1052 1053
}

/*
 * 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)
{
1054
	__le32 buf[3];
L
Linus Torvalds 已提交
1055 1056 1057
	int rc;

	rc = next_entry(buf, fp, sizeof buf);
1058
	if (rc) {
J
James Morris 已提交
1059
		printk(KERN_ERR "SELinux: context truncated\n");
L
Linus Torvalds 已提交
1060 1061 1062 1063 1064 1065
		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) {
1066 1067 1068
		rc = mls_read_range_helper(&c->range, fp);
		if (rc) {
			printk(KERN_ERR "SELinux: error reading MLS range of context\n");
L
Linus Torvalds 已提交
1069 1070 1071 1072
			goto out;
		}
	}

1073
	rc = -EINVAL;
L
Linus Torvalds 已提交
1074
	if (!policydb_context_isvalid(p, c)) {
J
James Morris 已提交
1075
		printk(KERN_ERR "SELinux:  invalid security context\n");
L
Linus Torvalds 已提交
1076
		context_destroy(c);
1077
		goto out;
L
Linus Torvalds 已提交
1078
	}
1079
	rc = 0;
L
Linus Torvalds 已提交
1080 1081 1082 1083 1084 1085 1086 1087 1088 1089
out:
	return rc;
}

/*
 * The following *_read functions are used to
 * read the symbol data from a policy database
 * binary representation file.
 */

1090 1091 1092 1093 1094
static int str_read(char **strp, gfp_t flags, void *fp, u32 len)
{
	int rc;
	char *str;

1095 1096 1097
	if ((len == 0) || (len == (u32)-1))
		return -EINVAL;

1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112
	str = kmalloc(len + 1, flags);
	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;
}

L
Linus Torvalds 已提交
1113 1114 1115 1116 1117
static int perm_read(struct policydb *p, struct hashtab *h, void *fp)
{
	char *key = NULL;
	struct perm_datum *perdatum;
	int rc;
1118 1119
	__le32 buf[2];
	u32 len;
L
Linus Torvalds 已提交
1120

1121
	rc = -ENOMEM;
J
James Morris 已提交
1122
	perdatum = kzalloc(sizeof(*perdatum), GFP_KERNEL);
1123 1124
	if (!perdatum)
		goto bad;
L
Linus Torvalds 已提交
1125 1126

	rc = next_entry(buf, fp, sizeof buf);
1127
	if (rc)
L
Linus Torvalds 已提交
1128 1129 1130 1131 1132
		goto bad;

	len = le32_to_cpu(buf[0]);
	perdatum->value = le32_to_cpu(buf[1]);

1133
	rc = str_read(&key, GFP_KERNEL, fp, len);
1134
	if (rc)
L
Linus Torvalds 已提交
1135 1136 1137 1138 1139
		goto bad;

	rc = hashtab_insert(h, key, perdatum);
	if (rc)
		goto bad;
1140 1141

	return 0;
L
Linus Torvalds 已提交
1142 1143
bad:
	perm_destroy(key, perdatum, NULL);
1144
	return rc;
L
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1145 1146 1147 1148 1149 1150
}

static int common_read(struct policydb *p, struct hashtab *h, void *fp)
{
	char *key = NULL;
	struct common_datum *comdatum;
1151 1152
	__le32 buf[4];
	u32 len, nel;
L
Linus Torvalds 已提交
1153 1154
	int i, rc;

1155
	rc = -ENOMEM;
J
James Morris 已提交
1156
	comdatum = kzalloc(sizeof(*comdatum), GFP_KERNEL);
1157 1158
	if (!comdatum)
		goto bad;
L
Linus Torvalds 已提交
1159 1160

	rc = next_entry(buf, fp, sizeof buf);
1161
	if (rc)
L
Linus Torvalds 已提交
1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172
		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]);

1173
	rc = str_read(&key, GFP_KERNEL, fp, len);
1174
	if (rc)
L
Linus Torvalds 已提交
1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185
		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;
1186
	return 0;
L
Linus Torvalds 已提交
1187 1188
bad:
	common_destroy(key, comdatum, NULL);
1189
	return rc;
L
Linus Torvalds 已提交
1190 1191
}

1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219
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)
L
Linus Torvalds 已提交
1220 1221 1222
{
	struct constraint_node *c, *lc;
	struct constraint_expr *e, *le;
1223 1224
	__le32 buf[3];
	u32 nexpr;
L
Linus Torvalds 已提交
1225 1226 1227 1228
	int rc, i, j, depth;

	lc = NULL;
	for (i = 0; i < ncons; i++) {
J
James Morris 已提交
1229
		c = kzalloc(sizeof(*c), GFP_KERNEL);
L
Linus Torvalds 已提交
1230 1231 1232
		if (!c)
			return -ENOMEM;

1233
		if (lc)
L
Linus Torvalds 已提交
1234
			lc->next = c;
1235
		else
L
Linus Torvalds 已提交
1236 1237 1238
			*nodep = c;

		rc = next_entry(buf, fp, (sizeof(u32) * 2));
1239
		if (rc)
L
Linus Torvalds 已提交
1240 1241 1242 1243 1244 1245
			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++) {
J
James Morris 已提交
1246
			e = kzalloc(sizeof(*e), GFP_KERNEL);
L
Linus Torvalds 已提交
1247 1248 1249
			if (!e)
				return -ENOMEM;

1250
			if (le)
L
Linus Torvalds 已提交
1251
				le->next = e;
1252
			else
L
Linus Torvalds 已提交
1253 1254 1255
				c->expr = e;

			rc = next_entry(buf, fp, (sizeof(u32) * 3));
1256
			if (rc)
L
Linus Torvalds 已提交
1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283
				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++;
1284 1285 1286
				rc = ebitmap_read(&e->names, fp);
				if (rc)
					return rc;
1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298
				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;
				}
L
Linus Torvalds 已提交
1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316
				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;
1317 1318
	__le32 buf[6];
	u32 len, len2, ncons, nel;
L
Linus Torvalds 已提交
1319 1320
	int i, rc;

1321
	rc = -ENOMEM;
J
James Morris 已提交
1322
	cladatum = kzalloc(sizeof(*cladatum), GFP_KERNEL);
1323 1324
	if (!cladatum)
		goto bad;
L
Linus Torvalds 已提交
1325 1326

	rc = next_entry(buf, fp, sizeof(u32)*6);
1327
	if (rc)
L
Linus Torvalds 已提交
1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341
		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]);

1342
	rc = str_read(&key, GFP_KERNEL, fp, len);
1343
	if (rc)
L
Linus Torvalds 已提交
1344 1345 1346
		goto bad;

	if (len2) {
1347
		rc = str_read(&cladatum->comkey, GFP_KERNEL, fp, len2);
1348
		if (rc)
L
Linus Torvalds 已提交
1349 1350
			goto bad;

1351 1352
		rc = -EINVAL;
		cladatum->comdatum = hashtab_search(p->p_commons.table, cladatum->comkey);
L
Linus Torvalds 已提交
1353
		if (!cladatum->comdatum) {
1354
			printk(KERN_ERR "SELinux:  unknown common %s\n", cladatum->comkey);
L
Linus Torvalds 已提交
1355 1356 1357 1358 1359 1360 1361 1362 1363
			goto bad;
		}
	}
	for (i = 0; i < nel; i++) {
		rc = perm_read(p, cladatum->permissions.table, fp);
		if (rc)
			goto bad;
	}

1364
	rc = read_cons_helper(p, &cladatum->constraints, ncons, 0, fp);
L
Linus Torvalds 已提交
1365 1366 1367 1368 1369 1370
	if (rc)
		goto bad;

	if (p->policyvers >= POLICYDB_VERSION_VALIDATETRANS) {
		/* grab the validatetrans rules */
		rc = next_entry(buf, fp, sizeof(u32));
1371
		if (rc)
L
Linus Torvalds 已提交
1372 1373
			goto bad;
		ncons = le32_to_cpu(buf[0]);
1374 1375
		rc = read_cons_helper(p, &cladatum->validatetrans,
				ncons, 1, fp);
L
Linus Torvalds 已提交
1376 1377 1378 1379
		if (rc)
			goto bad;
	}

1380 1381 1382 1383 1384 1385 1386 1387 1388 1389
	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]);
	}

1390 1391 1392 1393 1394 1395 1396
	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]);
	}

L
Linus Torvalds 已提交
1397 1398 1399 1400
	rc = hashtab_insert(h, key, cladatum);
	if (rc)
		goto bad;

1401
	return 0;
L
Linus Torvalds 已提交
1402
bad:
1403
	cls_destroy(key, cladatum, NULL);
1404
	return rc;
L
Linus Torvalds 已提交
1405 1406 1407 1408 1409 1410
}

static int role_read(struct policydb *p, struct hashtab *h, void *fp)
{
	char *key = NULL;
	struct role_datum *role;
1411 1412
	int rc, to_read = 2;
	__le32 buf[3];
1413
	u32 len;
L
Linus Torvalds 已提交
1414

1415
	rc = -ENOMEM;
J
James Morris 已提交
1416
	role = kzalloc(sizeof(*role), GFP_KERNEL);
1417 1418
	if (!role)
		goto bad;
L
Linus Torvalds 已提交
1419

1420 1421 1422 1423
	if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
		to_read = 3;

	rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1424
	if (rc)
L
Linus Torvalds 已提交
1425 1426 1427 1428
		goto bad;

	len = le32_to_cpu(buf[0]);
	role->value = le32_to_cpu(buf[1]);
1429 1430
	if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
		role->bounds = le32_to_cpu(buf[2]);
L
Linus Torvalds 已提交
1431

1432
	rc = str_read(&key, GFP_KERNEL, fp, len);
1433
	if (rc)
L
Linus Torvalds 已提交
1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444
		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) {
1445
		rc = -EINVAL;
L
Linus Torvalds 已提交
1446
		if (role->value != OBJECT_R_VAL) {
E
Eric Paris 已提交
1447
			printk(KERN_ERR "SELinux: Role %s has wrong value %d\n",
L
Linus Torvalds 已提交
1448 1449 1450 1451 1452 1453 1454 1455 1456 1457
			       OBJECT_R, role->value);
			goto bad;
		}
		rc = 0;
		goto bad;
	}

	rc = hashtab_insert(h, key, role);
	if (rc)
		goto bad;
1458
	return 0;
L
Linus Torvalds 已提交
1459 1460
bad:
	role_destroy(key, role, NULL);
1461
	return rc;
L
Linus Torvalds 已提交
1462 1463 1464 1465 1466 1467
}

static int type_read(struct policydb *p, struct hashtab *h, void *fp)
{
	char *key = NULL;
	struct type_datum *typdatum;
1468 1469
	int rc, to_read = 3;
	__le32 buf[4];
1470
	u32 len;
L
Linus Torvalds 已提交
1471

1472
	typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL);
1473
	if (!typdatum)
1474
		return -ENOMEM;
L
Linus Torvalds 已提交
1475

1476 1477 1478 1479
	if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
		to_read = 4;

	rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1480
	if (rc)
L
Linus Torvalds 已提交
1481 1482 1483 1484
		goto bad;

	len = le32_to_cpu(buf[0]);
	typdatum->value = le32_to_cpu(buf[1]);
1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496
	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]);
	}
L
Linus Torvalds 已提交
1497

1498
	rc = str_read(&key, GFP_KERNEL, fp, len);
1499
	if (rc)
L
Linus Torvalds 已提交
1500 1501 1502 1503 1504
		goto bad;

	rc = hashtab_insert(h, key, typdatum);
	if (rc)
		goto bad;
1505
	return 0;
L
Linus Torvalds 已提交
1506 1507
bad:
	type_destroy(key, typdatum, NULL);
1508
	return rc;
L
Linus Torvalds 已提交
1509 1510 1511 1512 1513 1514 1515 1516 1517
}


/*
 * Read a MLS level structure from a policydb binary
 * representation file.
 */
static int mls_read_level(struct mls_level *lp, void *fp)
{
1518
	__le32 buf[1];
L
Linus Torvalds 已提交
1519 1520 1521 1522 1523
	int rc;

	memset(lp, 0, sizeof(*lp));

	rc = next_entry(buf, fp, sizeof buf);
1524
	if (rc) {
J
James Morris 已提交
1525
		printk(KERN_ERR "SELinux: mls: truncated level\n");
1526
		return rc;
L
Linus Torvalds 已提交
1527 1528 1529
	}
	lp->sens = le32_to_cpu(buf[0]);

1530 1531 1532 1533
	rc = ebitmap_read(&lp->cat, fp);
	if (rc) {
		printk(KERN_ERR "SELinux: mls:  error reading level categories\n");
		return rc;
L
Linus Torvalds 已提交
1534 1535 1536 1537 1538 1539 1540 1541
	}
	return 0;
}

static int user_read(struct policydb *p, struct hashtab *h, void *fp)
{
	char *key = NULL;
	struct user_datum *usrdatum;
1542 1543
	int rc, to_read = 2;
	__le32 buf[3];
1544
	u32 len;
L
Linus Torvalds 已提交
1545

J
James Morris 已提交
1546
	usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL);
1547
	if (!usrdatum)
1548
		return -ENOMEM;
L
Linus Torvalds 已提交
1549

1550 1551 1552 1553
	if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
		to_read = 3;

	rc = next_entry(buf, fp, sizeof(buf[0]) * to_read);
1554
	if (rc)
L
Linus Torvalds 已提交
1555 1556 1557 1558
		goto bad;

	len = le32_to_cpu(buf[0]);
	usrdatum->value = le32_to_cpu(buf[1]);
1559 1560
	if (p->policyvers >= POLICYDB_VERSION_BOUNDARY)
		usrdatum->bounds = le32_to_cpu(buf[2]);
L
Linus Torvalds 已提交
1561

1562
	rc = str_read(&key, GFP_KERNEL, fp, len);
1563
	if (rc)
L
Linus Torvalds 已提交
1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581
		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;
1582
	return 0;
L
Linus Torvalds 已提交
1583 1584
bad:
	user_destroy(key, usrdatum, NULL);
1585
	return rc;
L
Linus Torvalds 已提交
1586 1587 1588 1589 1590 1591 1592
}

static int sens_read(struct policydb *p, struct hashtab *h, void *fp)
{
	char *key = NULL;
	struct level_datum *levdatum;
	int rc;
1593 1594
	__le32 buf[2];
	u32 len;
L
Linus Torvalds 已提交
1595

J
James Morris 已提交
1596
	levdatum = kzalloc(sizeof(*levdatum), GFP_ATOMIC);
1597
	if (!levdatum)
1598
		return -ENOMEM;
L
Linus Torvalds 已提交
1599 1600

	rc = next_entry(buf, fp, sizeof buf);
1601
	if (rc)
L
Linus Torvalds 已提交
1602 1603 1604 1605 1606
		goto bad;

	len = le32_to_cpu(buf[0]);
	levdatum->isalias = le32_to_cpu(buf[1]);

1607
	rc = str_read(&key, GFP_ATOMIC, fp, len);
1608
	if (rc)
L
Linus Torvalds 已提交
1609 1610
		goto bad;

1611
	rc = -ENOMEM;
1612
	levdatum->level = kmalloc(sizeof(*levdatum->level), GFP_ATOMIC);
1613
	if (!levdatum->level)
L
Linus Torvalds 已提交
1614
		goto bad;
1615 1616 1617

	rc = mls_read_level(levdatum->level, fp);
	if (rc)
L
Linus Torvalds 已提交
1618 1619 1620 1621 1622
		goto bad;

	rc = hashtab_insert(h, key, levdatum);
	if (rc)
		goto bad;
1623
	return 0;
L
Linus Torvalds 已提交
1624 1625
bad:
	sens_destroy(key, levdatum, NULL);
1626
	return rc;
L
Linus Torvalds 已提交
1627 1628 1629 1630 1631 1632 1633
}

static int cat_read(struct policydb *p, struct hashtab *h, void *fp)
{
	char *key = NULL;
	struct cat_datum *catdatum;
	int rc;
1634 1635
	__le32 buf[3];
	u32 len;
L
Linus Torvalds 已提交
1636

J
James Morris 已提交
1637
	catdatum = kzalloc(sizeof(*catdatum), GFP_ATOMIC);
1638
	if (!catdatum)
1639
		return -ENOMEM;
L
Linus Torvalds 已提交
1640 1641

	rc = next_entry(buf, fp, sizeof buf);
1642
	if (rc)
L
Linus Torvalds 已提交
1643 1644 1645 1646 1647 1648
		goto bad;

	len = le32_to_cpu(buf[0]);
	catdatum->value = le32_to_cpu(buf[1]);
	catdatum->isalias = le32_to_cpu(buf[2]);

1649
	rc = str_read(&key, GFP_ATOMIC, fp, len);
1650
	if (rc)
L
Linus Torvalds 已提交
1651 1652 1653 1654 1655
		goto bad;

	rc = hashtab_insert(h, key, catdatum);
	if (rc)
		goto bad;
1656
	return 0;
L
Linus Torvalds 已提交
1657 1658
bad:
	cat_destroy(key, catdatum, NULL);
1659
	return rc;
L
Linus Torvalds 已提交
1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673
}

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,
};

1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699
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",
1700 1701 1702
			       sym_name(p, SYM_USERS, user->value - 1),
			       sym_name(p, SYM_ROLES, bit),
			       sym_name(p, SYM_USERS, upper->value - 1));
1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736

			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",
1737 1738 1739
			       sym_name(p, SYM_ROLES, role->value - 1),
			       sym_name(p, SYM_TYPES, bit),
			       sym_name(p, SYM_ROLES, upper->value - 1));
1740 1741 1742 1743 1744 1745 1746 1747 1748 1749

			return -EINVAL;
		}
	}

	return 0;
}

static int type_bounds_sanity_check(void *key, void *datum, void *datap)
{
1750
	struct type_datum *upper;
1751 1752 1753
	struct policydb *p = datap;
	int depth = 0;

1754
	upper = datum;
1755 1756 1757 1758 1759 1760 1761 1762
	while (upper->bounds) {
		if (++depth == POLICYDB_BOUNDS_MAXDEPTH) {
			printk(KERN_ERR "SELinux: type %s: "
			       "too deep or looped boundary\n",
			       (char *) key);
			return -EINVAL;
		}

1763 1764 1765 1766
		upper = flex_array_get_ptr(p->type_val_to_struct_array,
					   upper->bounds - 1);
		BUG_ON(!upper);

1767 1768 1769 1770
		if (upper->attribute) {
			printk(KERN_ERR "SELinux: type %s: "
			       "bounded by attribute %s",
			       (char *) key,
1771
			       sym_name(p, SYM_TYPES, upper->value - 1));
1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803
			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;
}

1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837
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);
}

1838 1839
static int range_read(struct policydb *p, void *fp)
{
1840
	struct range_trans *rt;
1841 1842 1843 1844 1845 1846 1847 1848 1849 1850
	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)
1851
		return rc;
1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901

	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;
	}
1902
	hash_eval(p->range_tr, "rangetr");
1903 1904 1905 1906 1907 1908 1909
	rc = 0;
out:
	kfree(rt);
	kfree(r);
	return rc;
}

1910 1911
static int filename_trans_read(struct policydb *p, void *fp)
{
1912 1913
	struct filename_trans *ft;
	struct filename_trans_datum *otype;
1914
	char *name;
1915
	u32 nel, len;
1916 1917 1918 1919 1920 1921 1922 1923
	__le32 buf[4];
	int rc, i;

	if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
		return 0;

	rc = next_entry(buf, fp, sizeof(u32));
	if (rc)
1924
		return rc;
1925 1926 1927
	nel = le32_to_cpu(buf[0]);

	for (i = 0; i < nel; i++) {
1928 1929 1930
		otype = NULL;
		name = NULL;

1931 1932 1933 1934 1935
		rc = -ENOMEM;
		ft = kzalloc(sizeof(*ft), GFP_KERNEL);
		if (!ft)
			goto out;

1936 1937 1938 1939
		rc = -ENOMEM;
		otype = kmalloc(sizeof(*otype), GFP_KERNEL);
		if (!otype)
			goto out;
1940 1941 1942 1943 1944 1945 1946 1947

		/* 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 */
1948
		rc = str_read(&name, GFP_KERNEL, fp, len);
1949 1950
		if (rc)
			goto out;
1951 1952

		ft->name = name;
1953 1954 1955 1956 1957 1958 1959 1960

		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]);
1961 1962

		otype->otype = le32_to_cpu(buf[3]);
1963 1964 1965 1966

		rc = ebitmap_set_bit(&p->filename_trans_ttypes, ft->ttype, 1);
		if (rc)
			goto out;
1967

1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980
		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);
		}
1981
	}
1982 1983
	hash_eval(p->filename_trans, "filenametr");
	return 0;
1984
out:
1985 1986 1987 1988
	kfree(ft);
	kfree(name);
	kfree(otype);

1989 1990 1991
	return rc;
}

1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003
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)
2004
		return rc;
2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
	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;

2018
		rc = str_read(&newgenfs->fstype, GFP_KERNEL, fp, len);
2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056
		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;

2057
			rc = str_read(&newc->u.name, GFP_KERNEL, fp, len);
2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095
			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:
2096
	if (newgenfs) {
2097
		kfree(newgenfs->fstype);
2098 2099
		kfree(newgenfs);
	}
2100 2101 2102 2103 2104
	ocontext_destroy(newc, OCON_FSUSE);

	return rc;
}

2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149
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]);

2150
				rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188
				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]);
2189 2190 2191 2192
				/* 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)
2193 2194 2195
					goto out;

				len = le32_to_cpu(buf[1]);
2196
				rc = str_read(&c->u.name, GFP_KERNEL, fp, len);
2197 2198
				if (rc)
					goto out;
2199

2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226
				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;
			}
			}
		}
	}
	rc = 0;
out:
	return rc;
}

L
Linus Torvalds 已提交
2227 2228 2229 2230 2231 2232 2233 2234 2235
/*
 * 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;
2236
	__le32 buf[4];
2237 2238
	u32 len, nprim, nel;

L
Linus Torvalds 已提交
2239 2240 2241 2242 2243
	char *policydb_str;
	struct policydb_compat_info *info;

	rc = policydb_init(p);
	if (rc)
2244
		return rc;
L
Linus Torvalds 已提交
2245 2246

	/* Read the magic number and string length. */
2247
	rc = next_entry(buf, fp, sizeof(u32) * 2);
2248
	if (rc)
L
Linus Torvalds 已提交
2249 2250
		goto bad;

2251
	rc = -EINVAL;
2252
	if (le32_to_cpu(buf[0]) != POLICYDB_MAGIC) {
J
James Morris 已提交
2253
		printk(KERN_ERR "SELinux:  policydb magic number 0x%x does "
L
Linus Torvalds 已提交
2254
		       "not match expected magic number 0x%x\n",
2255
		       le32_to_cpu(buf[0]), POLICYDB_MAGIC);
L
Linus Torvalds 已提交
2256 2257 2258
		goto bad;
	}

2259
	rc = -EINVAL;
2260
	len = le32_to_cpu(buf[1]);
L
Linus Torvalds 已提交
2261
	if (len != strlen(POLICYDB_STRING)) {
J
James Morris 已提交
2262
		printk(KERN_ERR "SELinux:  policydb string length %d does not "
2263
		       "match expected length %zu\n",
L
Linus Torvalds 已提交
2264 2265 2266
		       len, strlen(POLICYDB_STRING));
		goto bad;
	}
2267 2268

	rc = -ENOMEM;
2269
	policydb_str = kmalloc(len + 1, GFP_KERNEL);
L
Linus Torvalds 已提交
2270
	if (!policydb_str) {
J
James Morris 已提交
2271
		printk(KERN_ERR "SELinux:  unable to allocate memory for policydb "
L
Linus Torvalds 已提交
2272 2273 2274
		       "string of length %d\n", len);
		goto bad;
	}
2275

L
Linus Torvalds 已提交
2276
	rc = next_entry(policydb_str, fp, len);
2277
	if (rc) {
J
James Morris 已提交
2278
		printk(KERN_ERR "SELinux:  truncated policydb string identifier\n");
L
Linus Torvalds 已提交
2279 2280 2281
		kfree(policydb_str);
		goto bad;
	}
2282 2283

	rc = -EINVAL;
2284
	policydb_str[len] = '\0';
L
Linus Torvalds 已提交
2285
	if (strcmp(policydb_str, POLICYDB_STRING)) {
J
James Morris 已提交
2286
		printk(KERN_ERR "SELinux:  policydb string %s does not match "
L
Linus Torvalds 已提交
2287 2288 2289 2290 2291 2292 2293 2294
		       "my string %s\n", policydb_str, POLICYDB_STRING);
		kfree(policydb_str);
		goto bad;
	}
	/* Done with policydb_str. */
	kfree(policydb_str);
	policydb_str = NULL;

2295
	/* Read the version and table sizes. */
L
Linus Torvalds 已提交
2296
	rc = next_entry(buf, fp, sizeof(u32)*4);
2297
	if (rc)
L
Linus Torvalds 已提交
2298 2299
		goto bad;

2300
	rc = -EINVAL;
2301
	p->policyvers = le32_to_cpu(buf[0]);
L
Linus Torvalds 已提交
2302 2303
	if (p->policyvers < POLICYDB_VERSION_MIN ||
	    p->policyvers > POLICYDB_VERSION_MAX) {
J
James Morris 已提交
2304
		printk(KERN_ERR "SELinux:  policydb version %d does not match "
2305 2306 2307
		       "my version range %d-%d\n",
		       le32_to_cpu(buf[0]), POLICYDB_VERSION_MIN, POLICYDB_VERSION_MAX);
		goto bad;
L
Linus Torvalds 已提交
2308 2309
	}

2310
	if ((le32_to_cpu(buf[1]) & POLICYDB_CONFIG_MLS)) {
2311
		p->mls_enabled = 1;
L
Linus Torvalds 已提交
2312

2313
		rc = -EINVAL;
L
Linus Torvalds 已提交
2314
		if (p->policyvers < POLICYDB_VERSION_MLS) {
E
Eric Paris 已提交
2315 2316 2317
			printk(KERN_ERR "SELinux: security policydb version %d "
				"(MLS) not backwards compatible\n",
				p->policyvers);
L
Linus Torvalds 已提交
2318 2319 2320
			goto bad;
		}
	}
2321 2322
	p->reject_unknown = !!(le32_to_cpu(buf[1]) & REJECT_UNKNOWN);
	p->allow_unknown = !!(le32_to_cpu(buf[1]) & ALLOW_UNKNOWN);
L
Linus Torvalds 已提交
2323

2324 2325 2326 2327 2328
	if (p->policyvers >= POLICYDB_VERSION_POLCAP) {
		rc = ebitmap_read(&p->policycaps, fp);
		if (rc)
			goto bad;
	}
2329

2330 2331 2332 2333 2334
	if (p->policyvers >= POLICYDB_VERSION_PERMISSIVE) {
		rc = ebitmap_read(&p->permissive_map, fp);
		if (rc)
			goto bad;
	}
E
Eric Paris 已提交
2335

2336
	rc = -EINVAL;
L
Linus Torvalds 已提交
2337 2338
	info = policydb_lookup_compat(p->policyvers);
	if (!info) {
J
James Morris 已提交
2339
		printk(KERN_ERR "SELinux:  unable to find policy compat info "
L
Linus Torvalds 已提交
2340 2341 2342 2343
		       "for version %d\n", p->policyvers);
		goto bad;
	}

2344
	rc = -EINVAL;
2345 2346
	if (le32_to_cpu(buf[2]) != info->sym_num ||
		le32_to_cpu(buf[3]) != info->ocon_num) {
J
James Morris 已提交
2347
		printk(KERN_ERR "SELinux:  policydb table sizes (%d,%d) do "
2348 2349
		       "not match mine (%d,%d)\n", le32_to_cpu(buf[2]),
			le32_to_cpu(buf[3]),
L
Linus Torvalds 已提交
2350 2351 2352 2353 2354 2355
		       info->sym_num, info->ocon_num);
		goto bad;
	}

	for (i = 0; i < info->sym_num; i++) {
		rc = next_entry(buf, fp, sizeof(u32)*2);
2356
		if (rc)
L
Linus Torvalds 已提交
2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368
			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;
	}

2369 2370 2371 2372 2373
	rc = -EINVAL;
	p->process_class = string_to_security_class(p, "process");
	if (!p->process_class)
		goto bad;

2374
	rc = avtab_read(&p->te_avtab, fp, p);
L
Linus Torvalds 已提交
2375 2376 2377 2378 2379 2380 2381 2382 2383 2384
	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));
2385
	if (rc)
L
Linus Torvalds 已提交
2386 2387 2388 2389
		goto bad;
	nel = le32_to_cpu(buf[0]);
	ltr = NULL;
	for (i = 0; i < nel; i++) {
2390
		rc = -ENOMEM;
J
James Morris 已提交
2391
		tr = kzalloc(sizeof(*tr), GFP_KERNEL);
2392
		if (!tr)
L
Linus Torvalds 已提交
2393
			goto bad;
2394
		if (ltr)
L
Linus Torvalds 已提交
2395
			ltr->next = tr;
2396
		else
L
Linus Torvalds 已提交
2397 2398
			p->role_tr = tr;
		rc = next_entry(buf, fp, sizeof(u32)*3);
2399
		if (rc)
L
Linus Torvalds 已提交
2400
			goto bad;
2401 2402

		rc = -EINVAL;
L
Linus Torvalds 已提交
2403 2404 2405
		tr->role = le32_to_cpu(buf[0]);
		tr->type = le32_to_cpu(buf[1]);
		tr->new_role = le32_to_cpu(buf[2]);
2406 2407 2408 2409 2410 2411 2412 2413
		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;

2414
		rc = -EINVAL;
2415 2416
		if (!policydb_role_isvalid(p, tr->role) ||
		    !policydb_type_isvalid(p, tr->type) ||
2417
		    !policydb_class_isvalid(p, tr->tclass) ||
2418
		    !policydb_role_isvalid(p, tr->new_role))
2419
			goto bad;
L
Linus Torvalds 已提交
2420 2421 2422 2423
		ltr = tr;
	}

	rc = next_entry(buf, fp, sizeof(u32));
2424
	if (rc)
L
Linus Torvalds 已提交
2425 2426 2427 2428
		goto bad;
	nel = le32_to_cpu(buf[0]);
	lra = NULL;
	for (i = 0; i < nel; i++) {
2429
		rc = -ENOMEM;
J
James Morris 已提交
2430
		ra = kzalloc(sizeof(*ra), GFP_KERNEL);
2431
		if (!ra)
L
Linus Torvalds 已提交
2432
			goto bad;
2433
		if (lra)
L
Linus Torvalds 已提交
2434
			lra->next = ra;
2435
		else
L
Linus Torvalds 已提交
2436 2437
			p->role_allow = ra;
		rc = next_entry(buf, fp, sizeof(u32)*2);
2438
		if (rc)
L
Linus Torvalds 已提交
2439
			goto bad;
2440 2441

		rc = -EINVAL;
L
Linus Torvalds 已提交
2442 2443
		ra->role = le32_to_cpu(buf[0]);
		ra->new_role = le32_to_cpu(buf[1]);
2444
		if (!policydb_role_isvalid(p, ra->role) ||
2445
		    !policydb_role_isvalid(p, ra->new_role))
2446
			goto bad;
L
Linus Torvalds 已提交
2447 2448 2449
		lra = ra;
	}

2450 2451 2452 2453
	rc = filename_trans_read(p, fp);
	if (rc)
		goto bad;

2454
	rc = policydb_index(p);
L
Linus Torvalds 已提交
2455 2456 2457
	if (rc)
		goto bad;

2458 2459 2460
	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");
2461 2462 2463
	if (!p->process_trans_perms)
		goto bad;

2464 2465 2466
	rc = ocontext_read(p, info, fp);
	if (rc)
		goto bad;
L
Linus Torvalds 已提交
2467

2468 2469
	rc = genfs_read(p, fp);
	if (rc)
L
Linus Torvalds 已提交
2470 2471
		goto bad;

2472 2473 2474
	rc = range_read(p, fp);
	if (rc)
		goto bad;
L
Linus Torvalds 已提交
2475

2476 2477 2478 2479 2480 2481 2482 2483
	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 */
2484
	rc = flex_array_prealloc(p->type_attr_map_array, 0, p->p_types.nprim,
2485 2486
				 GFP_KERNEL | __GFP_ZERO);
	if (rc)
2487 2488 2489
		goto bad;

	for (i = 0; i < p->p_types.nprim; i++) {
2490 2491 2492 2493
		struct ebitmap *e = flex_array_get(p->type_attr_map_array, i);

		BUG_ON(!e);
		ebitmap_init(e);
2494
		if (p->policyvers >= POLICYDB_VERSION_AVTAB) {
2495 2496
			rc = ebitmap_read(e, fp);
			if (rc)
2497 2498 2499
				goto bad;
		}
		/* add the type itself as the degenerate case */
2500 2501 2502
		rc = ebitmap_set_bit(e, i, 1);
		if (rc)
			goto bad;
2503 2504
	}

2505 2506 2507 2508
	rc = policydb_bounds_sanity_check(p);
	if (rc)
		goto bad;

L
Linus Torvalds 已提交
2509 2510 2511 2512 2513 2514 2515
	rc = 0;
out:
	return rc;
bad:
	policydb_destroy(p);
	goto out;
}
2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558

/*
 * 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);

H
Himangi Saraogi 已提交
2559
	BUG_ON(items > ARRAY_SIZE(buf));
2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629

	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;
}

2630
static int role_trans_write(struct policydb *p, void *fp)
2631
{
2632
	struct role_trans *r = p->role_tr;
2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651
	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;
2652 2653 2654 2655 2656 2657
		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;
		}
2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769
	}

	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;
}

2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787
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;
}

2788 2789 2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818
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;
2819 2820 2821 2822 2823 2824
				if (p->policyvers >=
					POLICYDB_VERSION_CONSTRAINT_NAMES) {
					rc = type_set_write(e->type_names, fp);
					if (rc)
						return rc;
				}
2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902
				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;

2903 2904 2905 2906 2907 2908 2909 2910 2911 2912
	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;
	}

2913 2914 2915 2916 2917 2918 2919
	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;
	}

2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940
	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);

H
Himangi Saraogi 已提交
2941
	BUG_ON(items > ARRAY_SIZE(buf));
2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990

	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);
	}
H
Himangi Saraogi 已提交
2991
	BUG_ON(items > ARRAY_SIZE(buf));
2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019
	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);
H
Himangi Saraogi 已提交
3020
	BUG_ON(items > ARRAY_SIZE(buf));
3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205
	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;
			}
		}
	}
	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;
}

3206
static int hashtab_cnt(void *key, void *data, void *ptr)
3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244
{
	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];
3245
	int rc, nel;
3246 3247 3248 3249 3250 3251 3252
	struct policy_data pd;

	pd.p = p;
	pd.fp = fp;

	/* count the number of entries in the hashtab */
	nel = 0;
3253
	rc = hashtab_map(p->range_tr, hashtab_cnt, &nel);
3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269
	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;
}

3270
static int filename_write_helper(void *key, void *data, void *ptr)
3271 3272
{
	__le32 buf[4];
3273 3274 3275
	struct filename_trans *ft = key;
	struct filename_trans_datum *otype = data;
	void *fp = ptr;
3276
	int rc;
3277
	u32 len;
3278

3279 3280
	len = strlen(ft->name);
	buf[0] = cpu_to_le32(len);
3281 3282 3283 3284
	rc = put_entry(buf, sizeof(u32), 1, fp);
	if (rc)
		return rc;

3285 3286 3287
	rc = put_entry(ft->name, sizeof(char), len, fp);
	if (rc)
		return rc;
3288

3289 3290 3291 3292
	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);
3293

3294 3295 3296
	rc = put_entry(buf, sizeof(u32), 4, fp);
	if (rc)
		return rc;
3297 3298 3299

	return 0;
}
3300 3301 3302 3303 3304 3305 3306

static int filename_trans_write(struct policydb *p, void *fp)
{
	u32 nel;
	__le32 buf[1];
	int rc;

3307 3308 3309
	if (p->policyvers < POLICYDB_VERSION_FILENAME_TRANS)
		return 0;

3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320 3321 3322 3323 3324 3325 3326
	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;
}

3327 3328 3329 3330 3331 3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378
/*
 * 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);
3379
		return -EINVAL;
3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428
	}

	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;

3429
	rc = role_trans_write(p, fp);
3430 3431 3432 3433 3434 3435 3436
	if (rc)
		return rc;

	rc = role_allow_write(p->role_allow, fp);
	if (rc)
		return rc;

3437 3438 3439 3440
	rc = filename_trans_write(p, fp);
	if (rc)
		return rc;

3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463
	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;
}