1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2015 Juniper Networks, Inc. 4 * 5 * Author: 6 * Petko Manolov <petko.manolov@konsulko.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/init.h> 15 #include <linux/slab.h> 16 #include <keys/system_keyring.h> 17 18 19 struct key *ima_blacklist_keyring; 20 21 /* 22 * Allocate the IMA blacklist keyring 23 */ 24 __init int ima_mok_init(void) 25 { 26 struct key_restriction *restriction; 27 28 pr_notice("Allocating IMA blacklist keyring.\n"); 29 30 restriction = kzalloc(sizeof(struct key_restriction), GFP_KERNEL); 31 if (!restriction) 32 panic("Can't allocate IMA blacklist restriction."); 33 34 restriction->check = restrict_link_by_builtin_trusted; 35 36 ima_blacklist_keyring = keyring_alloc(".ima_blacklist", 37 KUIDT_INIT(0), KGIDT_INIT(0), current_cred(), 38 (KEY_POS_ALL & ~KEY_POS_SETATTR) | 39 KEY_USR_VIEW | KEY_USR_READ | 40 KEY_USR_WRITE | KEY_USR_SEARCH, 41 KEY_ALLOC_NOT_IN_QUOTA, 42 restriction, NULL); 43 44 if (IS_ERR(ima_blacklist_keyring)) 45 panic("Can't allocate IMA blacklist keyring."); 46 47 set_bit(KEY_FLAG_KEEP, &ima_blacklist_keyring->flags); 48 return 0; 49 } 50 device_initcall(ima_mok_init); 51