/* System trusted keyring for trusted public keys * * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public Licence * as published by the Free Software Foundation; either version * 2 of the Licence, or (at your option) any later version. */ #include <linux/export.h>#include <linux/kernel.h>#include <linux/sched.h>#include <linux/cred.h>#include <linux/err.h>#include <keys/asymmetric-type.h>#include <keys/system_keyring.h>#include "module-internal.h" struct key *system_trusted_keyring;EXPORT_SYMBOL_GPL(system_trusted_keyring); extern __initconst const u8 system_certificate_list[];extern __initconst const unsigned long system_certificate_list_size; /* * Load the compiled-in keys */static __init int system_trusted_keyring_init(void){	pr_notice("Initialise system trusted keyring\n"); 	system_trusted_keyring =		keyring_alloc(".system_keyring",			      KUIDT_INIT(0), KGIDT_INIT(0), current_cred(),			      ((KEY_POS_ALL & ~KEY_POS_SETATTR) |			      KEY_USR_VIEW | KEY_USR_READ | KEY_USR_SEARCH),			      KEY_ALLOC_NOT_IN_QUOTA, NULL);	if (IS_ERR(system_trusted_keyring))		panic("Can't allocate system trusted keyring\n"); 	set_bit(KEY_FLAG_TRUSTED_ONLY, &system_trusted_keyring->flags);	return 0;} /* * Must be initialised before we try and load the keys into the keyring. */device_initcall(system_trusted_keyring_init); /* * Load the compiled-in list of X.509 certificates. */static __init int load_system_certificate_list(void){	key_ref_t key;	const u8 *p, *end;	size_t plen; 	pr_notice("Loading compiled-in X.509 certificates\n"); 	p = system_certificate_list;	end = p + system_certificate_list_size;	while (p < end) {		/* Each cert begins with an ASN.1 SEQUENCE tag and must be more		 * than 256 bytes in size.		 */		if (end - p < 4)			goto dodgy_cert;		if (p[0] != 0x30 &&		    p[1] != 0x82)			goto dodgy_cert;		plen = (p[2] << 8) | p[3];		plen += 4;		if (plen > end - p)			goto dodgy_cert; 		key = key_create_or_update(make_key_ref(system_trusted_keyring, 1),					   "asymmetric",					   NULL,					   p,					   plen,					   ((KEY_POS_ALL & ~KEY_POS_SETATTR) |					   KEY_USR_VIEW | KEY_USR_READ),					   KEY_ALLOC_NOT_IN_QUOTA |					   KEY_ALLOC_TRUSTED);		if (IS_ERR(key)) {			pr_err("Problem loading in-kernel X.509 certificate (%ld)\n",			       PTR_ERR(key));		} else {			set_bit(KEY_FLAG_BUILTIN, &key_ref_to_ptr(key)->flags);			pr_notice("Loaded X.509 cert '%s'\n",				  key_ref_to_ptr(key)->description);			key_ref_put(key);		}		p += plen;	} 	return 0; dodgy_cert:	pr_err("Problem parsing in-kernel X.509 certificate list\n");	return 0;}late_initcall(load_system_certificate_list);