security/integrity/ima/ima_mok.c

   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);