/* * AppArmor security module * * This file contains AppArmor policy loading interface function definitions. * * Copyright 2013 Canonical Ltd. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation, version 2 of the * License. * * Fns to provide a checksum of policy that has been loaded this can be * compared to userspace policy compiles to check loaded policy is what * it should be. */ #include <crypto/hash.h> #include "include/apparmor.h"#include "include/crypto.h" static unsigned int apparmor_hash_size; static struct crypto_shash *apparmor_tfm; unsigned int aa_hash_size(void){	return apparmor_hash_size;} int aa_calc_profile_hash(struct aa_profile *profile, u32 version, void *start,			 size_t len){	struct {		struct shash_desc shash;		char ctx[crypto_shash_descsize(apparmor_tfm)];	} desc;	int error = -ENOMEM;	u32 le32_version = cpu_to_le32(version); 	if (!apparmor_tfm)		return 0; 	profile->hash = kzalloc(apparmor_hash_size, GFP_KERNEL);	if (!profile->hash)		goto fail; 	desc.shash.tfm = apparmor_tfm;	desc.shash.flags = 0; 	error = crypto_shash_init(&desc.shash);	if (error)		goto fail;	error = crypto_shash_update(&desc.shash, (u8 *) &le32_version, 4);	if (error)		goto fail;	error = crypto_shash_update(&desc.shash, (u8 *) start, len);	if (error)		goto fail;	error = crypto_shash_final(&desc.shash, profile->hash);	if (error)		goto fail; 	return 0; fail:	kfree(profile->hash);	profile->hash = NULL; 	return error;} static int __init init_profile_hash(void){	struct crypto_shash *tfm; 	if (!apparmor_initialized)		return 0; 	tfm = crypto_alloc_shash("sha1", 0, CRYPTO_ALG_ASYNC);	if (IS_ERR(tfm)) {		int error = PTR_ERR(tfm);		AA_ERROR("failed to setup profile sha1 hashing: %d\n", error);		return error;	}	apparmor_tfm = tfm;	apparmor_hash_size = crypto_shash_digestsize(apparmor_tfm); 	aa_info_message("AppArmor sha1 policy hashing enabled"); 	return 0;} late_initcall(init_profile_hash);