mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-25 05:04:09 +08:00
62226983da
Apart from data-type specific alignment constraints, there are also architecture-specific alignment requirements. For example, on s390 symbols must be on even addresses implying a 2-byte alignment. If the system_certificate_list_end symbol is on an odd address and if this address is loaded, the least-significant bit is ignored. As a result, the load_system_certificate_list() fails to load the certificates because of a wrong certificate length calculation. To be safe, align system_certificate_list on an 8-byte boundary. Also improve the length calculation of the system_certificate_list content. Introduce a system_certificate_list_size (8-byte aligned because of unsigned long) variable that stores the length. Let the linker calculate this size by introducing a start and end label for the certificate content. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: David Howells <dhowells@redhat.com>
106 lines
2.7 KiB
C
106 lines
2.7 KiB
C
/* System trusted keyring for trusted public keys
|
|
*
|
|
* 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/export.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/cred.h>
|
|
#include <linux/err.h>
|
|
#include <keys/asymmetric-type.h>
|
|
#include <keys/system_keyring.h>
|
|
#include "module-internal.h"
|
|
|
|
struct key *system_trusted_keyring;
|
|
EXPORT_SYMBOL_GPL(system_trusted_keyring);
|
|
|
|
extern __initconst const u8 system_certificate_list[];
|
|
extern __initconst const unsigned long system_certificate_list_size;
|
|
|
|
/*
|
|
* Load the compiled-in keys
|
|
*/
|
|
static __init int system_trusted_keyring_init(void)
|
|
{
|
|
pr_notice("Initialise system trusted keyring\n");
|
|
|
|
system_trusted_keyring =
|
|
keyring_alloc(".system_keyring",
|
|
KUIDT_INIT(0), KGIDT_INIT(0), current_cred(),
|
|
((KEY_POS_ALL & ~KEY_POS_SETATTR) |
|
|
KEY_USR_VIEW | KEY_USR_READ | KEY_USR_SEARCH),
|
|
KEY_ALLOC_NOT_IN_QUOTA, NULL);
|
|
if (IS_ERR(system_trusted_keyring))
|
|
panic("Can't allocate system trusted keyring\n");
|
|
|
|
set_bit(KEY_FLAG_TRUSTED_ONLY, &system_trusted_keyring->flags);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Must be initialised before we try and load the keys into the keyring.
|
|
*/
|
|
device_initcall(system_trusted_keyring_init);
|
|
|
|
/*
|
|
* Load the compiled-in list of X.509 certificates.
|
|
*/
|
|
static __init int load_system_certificate_list(void)
|
|
{
|
|
key_ref_t key;
|
|
const u8 *p, *end;
|
|
size_t plen;
|
|
|
|
pr_notice("Loading compiled-in X.509 certificates\n");
|
|
|
|
p = system_certificate_list;
|
|
end = p + system_certificate_list_size;
|
|
while (p < end) {
|
|
/* Each cert begins with an ASN.1 SEQUENCE tag and must be more
|
|
* than 256 bytes in size.
|
|
*/
|
|
if (end - p < 4)
|
|
goto dodgy_cert;
|
|
if (p[0] != 0x30 &&
|
|
p[1] != 0x82)
|
|
goto dodgy_cert;
|
|
plen = (p[2] << 8) | p[3];
|
|
plen += 4;
|
|
if (plen > end - p)
|
|
goto dodgy_cert;
|
|
|
|
key = key_create_or_update(make_key_ref(system_trusted_keyring, 1),
|
|
"asymmetric",
|
|
NULL,
|
|
p,
|
|
plen,
|
|
((KEY_POS_ALL & ~KEY_POS_SETATTR) |
|
|
KEY_USR_VIEW | KEY_USR_READ),
|
|
KEY_ALLOC_NOT_IN_QUOTA |
|
|
KEY_ALLOC_TRUSTED);
|
|
if (IS_ERR(key)) {
|
|
pr_err("Problem loading in-kernel X.509 certificate (%ld)\n",
|
|
PTR_ERR(key));
|
|
} else {
|
|
pr_notice("Loaded X.509 cert '%s'\n",
|
|
key_ref_to_ptr(key)->description);
|
|
key_ref_put(key);
|
|
}
|
|
p += plen;
|
|
}
|
|
|
|
return 0;
|
|
|
|
dodgy_cert:
|
|
pr_err("Problem parsing in-kernel X.509 certificate list\n");
|
|
return 0;
|
|
}
|
|
late_initcall(load_system_certificate_list);
|