46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
// 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, "module");
|
|
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);
|
|
}
|