/* Public keys for module signature verification * * 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/kernel.h>#include <linux/sched.h>#include <linux/cred.h>#include <linux/err.h>#include <keys/asymmetric-type.h>#include "module-internal.h" struct key *modsign_keyring; extern __initdata const u8 modsign_certificate_list[];extern __initdata const u8 modsign_certificate_list_end[];asm(".section .init.data,\"aw\"\n"    SYMBOL_PREFIX "modsign_certificate_list:\n"    ".incbin \"signing_key.x509\"\n"    ".incbin \"extra_certificates\"\n"    SYMBOL_PREFIX "modsign_certificate_list_end:"    ); /* * We need to make sure ccache doesn't cache the .o file as it doesn't notice * if modsign.pub changes. */static __initdata const char annoy_ccache[] = __TIME__ "foo"; /* * Load the compiled-in keys */static __init int module_verify_init(void){	pr_notice("Initialise module verification\n"); 	modsign_keyring = key_alloc(&key_type_keyring, ".module_sign",				    KUIDT_INIT(0), KGIDT_INIT(0),				    current_cred(),				    (KEY_POS_ALL & ~KEY_POS_SETATTR) |				    KEY_USR_VIEW | KEY_USR_READ,				    KEY_ALLOC_NOT_IN_QUOTA);	if (IS_ERR(modsign_keyring))		panic("Can't allocate module signing keyring\n"); 	if (key_instantiate_and_link(modsign_keyring, NULL, 0, NULL, NULL) < 0)		panic("Can't instantiate module signing keyring\n"); 	return 0;} /* * Must be initialised before we try and load the keys into the keyring. */device_initcall(module_verify_init); /* * Load the compiled-in keys */static __init int load_module_signing_keys(void){	key_ref_t key;	const u8 *p, *end;	size_t plen; 	pr_notice("Loading module verification certificates\n"); 	end = modsign_certificate_list_end;	p = modsign_certificate_list;	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(modsign_keyring, 1),					   "asymmetric",					   NULL,					   p,					   plen,					   (KEY_POS_ALL & ~KEY_POS_SETATTR) |					   KEY_USR_VIEW,					   KEY_ALLOC_NOT_IN_QUOTA);		if (IS_ERR(key))			pr_err("MODSIGN: Problem loading in-kernel X.509 certificate (%ld)\n",			       PTR_ERR(key));		else			pr_notice("MODSIGN: Loaded cert '%s'\n",				  key_ref_to_ptr(key)->description);		p += plen;	} 	return 0; dodgy_cert:	pr_err("MODSIGN: Problem parsing in-kernel X.509 certificate list\n");	return 0;}late_initcall(load_module_signing_keys);