mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-17 01:34:00 +08:00
c8424e776b
IMA will use the module_signature format for append signatures, so export the relevant definitions and factor out the code which verifies that the appended signature trailer is valid. Also, create a CONFIG_MODULE_SIG_FORMAT option so that IMA can select it and be able to use mod_check_sig() without having to depend on either CONFIG_MODULE_SIG or CONFIG_MODULES. s390 duplicated the definition of struct module_signature so now they can use the new <linux/module_signature.h> header instead. Signed-off-by: Thiago Jung Bauermann <bauerman@linux.ibm.com> Acked-by: Jessica Yu <jeyu@kernel.org> Reviewed-by: Philipp Rudo <prudo@linux.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
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;
|
|
}
|