1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Platform keyring for firmware/platform keys
4 *
5 * Copyright IBM Corporation, 2018
6 * Author(s): Nayna Jain <nayna@linux.ibm.com>
7 */
8
9#include <linux/export.h>
10#include <linux/kernel.h>
11#include <linux/sched.h>
12#include <linux/cred.h>
13#include <linux/err.h>
14#include <linux/slab.h>
15#include "../integrity.h"
16
17/**
18 * add_to_platform_keyring - Add to platform keyring without validation.
19 * @source: Source of key
20 * @data: The blob holding the key
21 * @len: The length of the data blob
22 *
23 * Add a key to the platform keyring without checking its trust chain.  This
24 * is available only during kernel initialisation.
25 */
26void __init add_to_platform_keyring(const char *source, const void *data,
27				    size_t len)
28{
29	key_perm_t perm;
30	int rc;
31
32	perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_VIEW;
33
34	rc = integrity_load_cert(INTEGRITY_KEYRING_PLATFORM, source, data, len,
35				 perm);
36	if (rc)
37		pr_info("Error adding keys to platform keyring %s\n", source);
38}
39
40/*
41 * Create the trusted keyrings.
42 */
43static __init int platform_keyring_init(void)
44{
45	int rc;
46
47	rc = integrity_init_keyring(INTEGRITY_KEYRING_PLATFORM);
48	if (rc)
49		return rc;
50
51	pr_notice("Platform Keyring initialized\n");
52	return 0;
53}
54
55/*
56 * Must be initialised before we try and load the keys into the keyring.
57 */
58device_initcall(platform_keyring_init);
59