mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-17 01:04:19 +08:00
47 lines
1.1 KiB
C
47 lines
1.1 KiB
C
|
// 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: Module is 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;
|
||
|
|
}
|