mirror of
https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
f314dfea16
Now that we have the load_info struct all initialized (including info->name, which contains the name of the module) before module_sig_check(), make the load_info struct and hence module name available to mod_verify_sig() so that we can log the module name in the event of an error. Signed-off-by: Jessica Yu <jeyu@kernel.org>
88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
/* Module signature checker
|
|
*
|
|
* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public Licence
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the Licence, or (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/string.h>
|
|
#include <linux/verification.h>
|
|
#include <crypto/public_key.h>
|
|
#include "module-internal.h"
|
|
|
|
enum pkey_id_type {
|
|
PKEY_ID_PGP, /* OpenPGP generated key ID */
|
|
PKEY_ID_X509, /* X.509 arbitrary subjectKeyIdentifier */
|
|
PKEY_ID_PKCS7, /* Signature in PKCS#7 message */
|
|
};
|
|
|
|
/*
|
|
* Module signature information block.
|
|
*
|
|
* The constituents of the signature section are, in order:
|
|
*
|
|
* - Signer's name
|
|
* - Key identifier
|
|
* - Signature data
|
|
* - Information block
|
|
*/
|
|
struct module_signature {
|
|
u8 algo; /* Public-key crypto algorithm [0] */
|
|
u8 hash; /* Digest algorithm [0] */
|
|
u8 id_type; /* Key identifier type [PKEY_ID_PKCS7] */
|
|
u8 signer_len; /* Length of signer's name [0] */
|
|
u8 key_id_len; /* Length of key identifier [0] */
|
|
u8 __pad[3];
|
|
__be32 sig_len; /* Length of signature data */
|
|
};
|
|
|
|
/*
|
|
* 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;
|
|
|
|
pr_devel("==>%s(,%zu)\n", __func__, modlen);
|
|
|
|
if (modlen <= sizeof(ms))
|
|
return -EBADMSG;
|
|
|
|
memcpy(&ms, mod + (modlen - sizeof(ms)), sizeof(ms));
|
|
modlen -= sizeof(ms);
|
|
|
|
sig_len = be32_to_cpu(ms.sig_len);
|
|
if (sig_len >= modlen)
|
|
return -EBADMSG;
|
|
modlen -= sig_len;
|
|
info->len = modlen;
|
|
|
|
if (ms.id_type != PKEY_ID_PKCS7) {
|
|
pr_err("%s: Module is not signed with expected PKCS#7 message\n",
|
|
info->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",
|
|
info->name);
|
|
return -EBADMSG;
|
|
}
|
|
|
|
return verify_pkcs7_signature(mod, modlen, mod + modlen, sig_len,
|
|
NULL, VERIFYING_MODULE_SIGNATURE,
|
|
NULL, NULL);
|
|
}
|