[GitHub/mt8127/android_kernel_alcatel_ttab.git] / kernel / modsign_pubkey.c

/* 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);
Commit	Line	Data
631cc66e DH	1	/* Public keys for module signature verification
	2	*
	3	* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
	4	* Written by David Howells (dhowells@redhat.com)
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public Licence
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the Licence, or (at your option) any later version.
	10	*/
	11
	12	#include <linux/kernel.h>
	13	#include <linux/sched.h>
	14	#include <linux/cred.h>
	15	#include <linux/err.h>
	16	#include <keys/asymmetric-type.h>
	17	#include "module-internal.h"
	18
	19	struct key *modsign_keyring;
	20
	21	extern __initdata const u8 modsign_certificate_list[];
	22	extern __initdata const u8 modsign_certificate_list_end[];
	23	asm(".section .init.data,\"aw\"\n"
84ecfd15	24	SYMBOL_PREFIX "modsign_certificate_list:\n"
631cc66e DH	25	".incbin \"signing_key.x509\"\n"
631cc66e DH	26	".incbin \"extra_certificates\"\n"
84ecfd15	27	SYMBOL_PREFIX "modsign_certificate_list_end:"
631cc66e DH	28	);
	29
	30	/*
	31	* We need to make sure ccache doesn't cache the .o file as it doesn't notice
	32	* if modsign.pub changes.
	33	*/
	34	static __initdata const char annoy_ccache[] = __TIME__ "foo";
	35
	36	/*
	37	* Load the compiled-in keys
	38	*/
	39	static __init int module_verify_init(void)
	40	{
	41	pr_notice("Initialise module verification\n");
	42
	43	modsign_keyring = key_alloc(&key_type_keyring, ".module_sign",
	44	KUIDT_INIT(0), KGIDT_INIT(0),
	45	current_cred(),
	46	(KEY_POS_ALL & ~KEY_POS_SETATTR) \|
	47	KEY_USR_VIEW \| KEY_USR_READ,
	48	KEY_ALLOC_NOT_IN_QUOTA);
	49	if (IS_ERR(modsign_keyring))
	50	panic("Can't allocate module signing keyring\n");
	51
	52	if (key_instantiate_and_link(modsign_keyring, NULL, 0, NULL, NULL) < 0)
	53	panic("Can't instantiate module signing keyring\n");
	54
	55	return 0;
	56	}
	57
	58	/*
	59	* Must be initialised before we try and load the keys into the keyring.
	60	*/
	61	device_initcall(module_verify_init);
	62
	63	/*
	64	* Load the compiled-in keys
	65	*/
	66	static __init int load_module_signing_keys(void)
	67	{
	68	key_ref_t key;
	69	const u8 p, end;
	70	size_t plen;
	71
	72	pr_notice("Loading module verification certificates\n");
	73
	74	end = modsign_certificate_list_end;
	75	p = modsign_certificate_list;
	76	while (p < end) {
	77	/* Each cert begins with an ASN.1 SEQUENCE tag and must be more
	78	* than 256 bytes in size.
	79	*/
	80	if (end - p < 4)
	81	goto dodgy_cert;
	82	if (p[0] != 0x30 &&
	83	p[1] != 0x82)
	84	goto dodgy_cert;
	85	plen = (p[2] << 8) \| p[3];
	86	plen += 4;
	87	if (plen > end - p)
	88	goto dodgy_cert;
	89
	90	key = key_create_or_update(make_key_ref(modsign_keyring, 1),
	91	"asymmetric",
92	NULL,
93	p,
94	plen,
95	(KEY_POS_ALL & ~KEY_POS_SETATTR) \|
96	KEY_USR_VIEW,
97	KEY_ALLOC_NOT_IN_QUOTA);
98	if (IS_ERR(key))
99	pr_err("MODSIGN: Problem loading in-kernel X.509 certificate (%ld)\n",
100	PTR_ERR(key));
101	else
102	pr_notice("MODSIGN: Loaded cert '%s'\n",
103	key_ref_to_ptr(key)->description);
104	p += plen;
105	}
106
107	return 0;
108
109	dodgy_cert:
110	pr_err("MODSIGN: Problem parsing in-kernel X.509 certificate list\n");
111	return 0;
112	}
113	late_initcall(load_module_signing_keys);