1 // SPDX-License-Identifier: GPL-2.0+
3 * Module signature checker
5 * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
6 * Written by David Howells (dhowells@redhat.com)
9 #include <linux/errno.h>
10 #include <linux/printk.h>
11 #include <linux/module_signature.h>
12 #include <asm/byteorder.h>
15 * mod_check_sig - check that the given signature is sane
17 * @ms: Signature to check.
18 * @file_len: Size of the file to which @ms is appended.
19 * @name: What is being checked. Used for error messages.
21 int mod_check_sig(const struct module_signature *ms, size_t file_len,
24 if (be32_to_cpu(ms->sig_len) >= file_len - sizeof(*ms))
27 if (ms->id_type != PKEY_ID_PKCS7) {
28 pr_err("%s: not signed with expected PKCS#7 message\n",
35 ms->signer_len != 0 ||
36 ms->key_id_len != 0 ||
40 pr_err("%s: PKCS#7 signature info has unexpected non-zero params\n",