// SPDX-License-Identifier: GPL-2.0-only/* * AppArmor security module * * This file contains AppArmor policy loading interface function definitions. * * Copyright 2013 Canonical Ltd. * * 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/sha2.h> #include "include/apparmor.h"#include "include/crypto.h" unsigned int aa_hash_size(void){	return SHA256_DIGEST_SIZE;} char *aa_calc_hash(void *data, size_t len){	char *hash; 	hash = kzalloc(SHA256_DIGEST_SIZE, GFP_KERNEL);	if (!hash)		return ERR_PTR(-ENOMEM); 	sha256(data, len, hash);	return hash;} int aa_calc_profile_hash(struct aa_profile *profile, u32 version, void *start,			 size_t len){	struct sha256_ctx sctx;	__le32 le32_version = cpu_to_le32(version); 	if (!aa_g_hash_policy)		return 0; 	profile->hash = kzalloc(SHA256_DIGEST_SIZE, GFP_KERNEL);	if (!profile->hash)		return -ENOMEM; 	sha256_init(&sctx);	sha256_update(&sctx, (u8 *)&le32_version, 4);	sha256_update(&sctx, (u8 *)start, len);	sha256_final(&sctx, profile->hash);	return 0;} int __init init_profile_hash(void){	if (apparmor_initialized)		aa_info_message("AppArmor sha256 policy hashing enabled");	return 0;}