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Linux/security/integrity/ima/ima_mok.c

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  1 /*
  2  * Copyright (C) 2015 Juniper Networks, Inc.
  3  *
  4  * Author:
  5  * Petko Manolov <petko.manolov@konsulko.com>
  6  *
  7  * This program is free software; you can redistribute it and/or
  8  * modify it under the terms of the GNU General Public License as
  9  * published by the Free Software Foundation, version 2 of the
 10  * License.
 11  *
 12  */
 13 
 14 #include <linux/export.h>
 15 #include <linux/kernel.h>
 16 #include <linux/sched.h>
 17 #include <linux/cred.h>
 18 #include <linux/err.h>
 19 #include <linux/init.h>
 20 #include <linux/slab.h>
 21 #include <keys/system_keyring.h>
 22 
 23 
 24 struct key *ima_blacklist_keyring;
 25 
 26 /*
 27  * Allocate the IMA blacklist keyring
 28  */
 29 __init int ima_mok_init(void)
 30 {
 31         struct key_restriction *restriction;
 32 
 33         pr_notice("Allocating IMA blacklist keyring.\n");
 34 
 35         restriction = kzalloc(sizeof(struct key_restriction), GFP_KERNEL);
 36         if (!restriction)
 37                 panic("Can't allocate IMA blacklist restriction.");
 38 
 39         restriction->check = restrict_link_by_builtin_trusted;
 40 
 41         ima_blacklist_keyring = keyring_alloc(".ima_blacklist",
 42                                 KUIDT_INIT(0), KGIDT_INIT(0), current_cred(),
 43                                 (KEY_POS_ALL & ~KEY_POS_SETATTR) |
 44                                 KEY_USR_VIEW | KEY_USR_READ |
 45                                 KEY_USR_WRITE | KEY_USR_SEARCH,
 46                                 KEY_ALLOC_NOT_IN_QUOTA,
 47                                 restriction, NULL);
 48 
 49         if (IS_ERR(ima_blacklist_keyring))
 50                 panic("Can't allocate IMA blacklist keyring.");
 51 
 52         set_bit(KEY_FLAG_KEEP, &ima_blacklist_keyring->flags);
 53         return 0;
 54 }
 55 device_initcall(ima_mok_init);
 56 

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