// SPDX-License-Identifier: GPL-2.0-or-later/* Module signature checker * * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) */ #include <linux/kernel.h>#include <linux/errno.h>#include <linux/module.h>#include <linux/module_signature.h>#include <linux/string.h>#include <linux/verification.h>#include <crypto/public_key.h>#include "module-internal.h" /* * Verify the signature on a module. */int mod_verify_sig(const void *mod, struct load_info *info){	struct module_signature ms;	size_t sig_len, modlen = info->len;	int ret; 	pr_devel("==>%s(,%zu)\n", __func__, modlen); 	if (modlen <= sizeof(ms))		return -EBADMSG; 	memcpy(&ms, mod + (modlen - sizeof(ms)), sizeof(ms)); 	ret = mod_check_sig(&ms, modlen, info->name);	if (ret)		return ret; 	sig_len = be32_to_cpu(ms.sig_len);	modlen -= sig_len + sizeof(ms);	info->len = modlen; 	return verify_pkcs7_signature(mod, modlen, mod + modlen, sig_len,				      VERIFY_USE_SECONDARY_KEYRING,				      VERIFYING_MODULE_SIGNATURE,				      NULL, NULL);}