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// SPDX-License-Identifier: GPL-2.0+
/*
* Module signature checker
*
* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*/
#include <linux/errno.h>
#include <linux/printk.h>
#include <linux/module_signature.h>
#include <asm/byteorder.h>
/**
* mod_check_sig - check that the given signature is sane
*
* @ms: Signature to check.
* @file_len: Size of the file to which @ms is appended.
* @name: What is being checked. Used for error messages.
*/
int mod_check_sig(const struct module_signature *ms, size_t file_len,
const char *name)
{
if (be32_to_cpu(ms->sig_len) >= file_len - sizeof(*ms))
return -EBADMSG;
if (ms->id_type != PKEY_ID_PKCS7) {
pr_err("%s: not signed with expected PKCS#7 message\n",
name);
return -ENOPKG;
}
if (ms->algo != 0 ||
ms->hash != 0 ||
ms->signer_len != 0 ||
ms->key_id_len != 0 ||
ms->__pad[0] != 0 ||
ms->__pad[1] != 0 ||
ms->__pad[2] != 0) {
pr_err("%s: PKCS#7 signature info has unexpected non-zero params\n",
name);
return -EBADMSG;
}
return 0;
}
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