integrity/ima/ima_mok.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Copyright (C) 2015 Juniper Networks, Inc.
0004  *
0005  * Author:
0006  * Petko Manolov <petko.manolov@konsulko.com>
0007  */
0008
0009 #include <linux/export.h>
0010 #include <linux/kernel.h>
0011 #include <linux/sched.h>
0012 #include <linux/cred.h>
0013 #include <linux/err.h>
0014 #include <linux/init.h>
0015 #include <linux/slab.h>
0016 #include <keys/system_keyring.h>
0017
0018
0019 struct key *ima_blacklist_keyring;
0020
0021 /*
0022  * Allocate the IMA blacklist keyring
0023  */
0024 static __init int ima_mok_init(void)
0025 {
0026     struct key_restriction *restriction;
0027
0028     pr_notice("Allocating IMA blacklist keyring.\n");
0029
0030     restriction = kzalloc(sizeof(struct key_restriction), GFP_KERNEL);
0031     if (!restriction)
0032         panic("Can't allocate IMA blacklist restriction.");
0033
0034     restriction->check = restrict_link_by_builtin_trusted;
0035
0036     ima_blacklist_keyring = keyring_alloc(".ima_blacklist",
0037                 KUIDT_INIT(0), KGIDT_INIT(0), current_cred(),
0038                 (KEY_POS_ALL & ~KEY_POS_SETATTR) |
0039                 KEY_USR_VIEW | KEY_USR_READ |
0040                 KEY_USR_WRITE | KEY_USR_SEARCH,
0041                 KEY_ALLOC_NOT_IN_QUOTA |
0042                 KEY_ALLOC_SET_KEEP,
0043                 restriction, NULL);
0044
0045     if (IS_ERR(ima_blacklist_keyring))
0046         panic("Can't allocate IMA blacklist keyring.");
0047     return 0;
0048 }
0049 device_initcall(ima_mok_init);