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  */
26 void __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  */
43 static __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  */
58 device_initcall(platform_keyring_init);
59