[linux-block.git] / certs / blacklist.c

// SPDX-License-Identifier: GPL-2.0-or-later
/* System hash blacklist.
 *
 * Copyright (C) 2016 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 */

#define pr_fmt(fmt) "blacklist: "fmt
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/key.h>
#include <linux/key-type.h>
#include <linux/sched.h>
#include <linux/ctype.h>
#include <linux/err.h>
#include <linux/seq_file.h>
#include <linux/uidgid.h>
#include <keys/asymmetric-type.h>
#include <keys/system_keyring.h>
#include "blacklist.h"

/*
 * According to crypto/asymmetric_keys/x509_cert_parser.c:x509_note_pkey_algo(),
 * the size of the currently longest supported hash algorithm is 512 bits,
 * which translates into 128 hex characters.
 */
#define MAX_HASH_LEN	128

#define BLACKLIST_KEY_PERM (KEY_POS_SEARCH | KEY_POS_VIEW | \
			    KEY_USR_SEARCH | KEY_USR_VIEW)

static const char tbs_prefix[] = "tbs";
static const char bin_prefix[] = "bin";

static struct key *blacklist_keyring;

#ifdef CONFIG_SYSTEM_REVOCATION_LIST
extern __initconst const u8 revocation_certificate_list[];
extern __initconst const unsigned long revocation_certificate_list_size;
#endif

/*
 * The description must be a type prefix, a colon and then an even number of
 * hex digits.  The hash is kept in the description.
 */
static int blacklist_vet_description(const char *desc)
{
	int i, prefix_len, tbs_step = 0, bin_step = 0;

	/* The following algorithm only works if prefix lengths match. */
	BUILD_BUG_ON(sizeof(tbs_prefix) != sizeof(bin_prefix));
	prefix_len = sizeof(tbs_prefix) - 1;
	for (i = 0; *desc; desc++, i++) {
		if (*desc == ':') {
			if (tbs_step == prefix_len)
				goto found_colon;
			if (bin_step == prefix_len)
				goto found_colon;
			return -EINVAL;
		}
		if (i >= prefix_len)
			return -EINVAL;
		if (*desc == tbs_prefix[i])
			tbs_step++;
		if (*desc == bin_prefix[i])
			bin_step++;
	}
	return -EINVAL;

found_colon:
	desc++;
	for (i = 0; *desc && i < MAX_HASH_LEN; desc++, i++) {
		if (!isxdigit(*desc) || isupper(*desc))
			return -EINVAL;
	}
	if (*desc)
		/* The hash is greater than MAX_HASH_LEN. */
		return -ENOPKG;

	/* Checks for an even number of hexadecimal characters. */
	if (i == 0 || i & 1)
		return -EINVAL;
	return 0;
}

static int blacklist_key_instantiate(struct key *key,
		struct key_preparsed_payload *prep)
{
#ifdef CONFIG_SYSTEM_BLACKLIST_AUTH_UPDATE
	int err;
#endif

	/* Sets safe default permissions for keys loaded by user space. */
	key->perm = BLACKLIST_KEY_PERM;

	/*
	 * Skips the authentication step for builtin hashes, they are not
	 * signed but still trusted.
	 */
	if (key->flags & (1 << KEY_FLAG_BUILTIN))
		goto out;

#ifdef CONFIG_SYSTEM_BLACKLIST_AUTH_UPDATE
	/*
	 * Verifies the description's PKCS#7 signature against the builtin
	 * trusted keyring.
	 */
	err = verify_pkcs7_signature(key->description,
			strlen(key->description), prep->data, prep->datalen,
			NULL, VERIFYING_UNSPECIFIED_SIGNATURE, NULL, NULL);
	if (err)
		return err;
#else
	/*
	 * It should not be possible to come here because the keyring doesn't
	 * have KEY_USR_WRITE and the only other way to call this function is
	 * for builtin hashes.
	 */
	WARN_ON_ONCE(1);
	return -EPERM;
#endif

out:
	return generic_key_instantiate(key, prep);
}

static int blacklist_key_update(struct key *key,
		struct key_preparsed_payload *prep)
{
	return -EPERM;
}

static void blacklist_describe(const struct key *key, struct seq_file *m)
{
	seq_puts(m, key->description);
}

static struct key_type key_type_blacklist = {
	.name			= "blacklist",
	.vet_description	= blacklist_vet_description,
	.instantiate		= blacklist_key_instantiate,
	.update			= blacklist_key_update,
	.describe		= blacklist_describe,
};

static char *get_raw_hash(const u8 *hash, size_t hash_len,
		enum blacklist_hash_type hash_type)
{
	size_t type_len;
	const char *type_prefix;
	char *buffer, *p;

	switch (hash_type) {
	case BLACKLIST_HASH_X509_TBS:
		type_len = sizeof(tbs_prefix) - 1;
		type_prefix = tbs_prefix;
		break;
	case BLACKLIST_HASH_BINARY:
		type_len = sizeof(bin_prefix) - 1;
		type_prefix = bin_prefix;
		break;
	default:
		WARN_ON_ONCE(1);
		return ERR_PTR(-EINVAL);
	}
	buffer = kmalloc(type_len + 1 + hash_len * 2 + 1, GFP_KERNEL);
	if (!buffer)
		return ERR_PTR(-ENOMEM);
	p = memcpy(buffer, type_prefix, type_len);
	p += type_len;
	*p++ = ':';
	bin2hex(p, hash, hash_len);
	p += hash_len * 2;
	*p = '\0';
	return buffer;
}

/**
 * mark_raw_hash_blacklisted - Add a hash to the system blacklist
 * @hash: The hash as a hex string with a type prefix (eg. "tbs:23aa429783")
 */
static int mark_raw_hash_blacklisted(const char *hash)
{
	key_ref_t key;

	key = key_create(make_key_ref(blacklist_keyring, true),
			 "blacklist",
			 hash,
			 NULL,
			 0,
			 BLACKLIST_KEY_PERM,
			 KEY_ALLOC_NOT_IN_QUOTA |
			 KEY_ALLOC_BUILT_IN);
	if (IS_ERR(key)) {
		if (PTR_ERR(key) == -EEXIST)
			pr_warn("Duplicate blacklisted hash %s\n", hash);
		else
			pr_err("Problem blacklisting hash %s: %pe\n", hash, key);
		return PTR_ERR(key);
	}
	return 0;
}

int mark_hash_blacklisted(const u8 *hash, size_t hash_len,
		enum blacklist_hash_type hash_type)
{
	const char *buffer;
	int err;

	buffer = get_raw_hash(hash, hash_len, hash_type);
	if (IS_ERR(buffer))
		return PTR_ERR(buffer);
	err = mark_raw_hash_blacklisted(buffer);
	kfree(buffer);
	return err;
}

/**
 * is_hash_blacklisted - Determine if a hash is blacklisted
 * @hash: The hash to be checked as a binary blob
 * @hash_len: The length of the binary hash
 * @hash_type: Type of hash
 */
int is_hash_blacklisted(const u8 *hash, size_t hash_len,
		enum blacklist_hash_type hash_type)
{
	key_ref_t kref;
	const char *buffer;
	int ret = 0;

	buffer = get_raw_hash(hash, hash_len, hash_type);
	if (IS_ERR(buffer))
		return PTR_ERR(buffer);
	kref = keyring_search(make_key_ref(blacklist_keyring, true),
			      &key_type_blacklist, buffer, false);
	if (!IS_ERR(kref)) {
		key_ref_put(kref);
		ret = -EKEYREJECTED;
	}

	kfree(buffer);
	return ret;
}
EXPORT_SYMBOL_GPL(is_hash_blacklisted);

int is_binary_blacklisted(const u8 *hash, size_t hash_len)
{
	if (is_hash_blacklisted(hash, hash_len, BLACKLIST_HASH_BINARY) ==
			-EKEYREJECTED)
		return -EPERM;

	return 0;
}
EXPORT_SYMBOL_GPL(is_binary_blacklisted);

#ifdef CONFIG_SYSTEM_REVOCATION_LIST
/**
 * add_key_to_revocation_list - Add a revocation certificate to the blacklist
 * @data: The data blob containing the certificate
 * @size: The size of data blob
 */
int add_key_to_revocation_list(const char *data, size_t size)
{
	key_ref_t key;

	key = key_create_or_update(make_key_ref(blacklist_keyring, true),
				   "asymmetric",
				   NULL,
				   data,
				   size,
				   KEY_POS_VIEW | KEY_POS_READ | KEY_POS_SEARCH
				   | KEY_USR_VIEW,
				   KEY_ALLOC_NOT_IN_QUOTA | KEY_ALLOC_BUILT_IN
				   | KEY_ALLOC_BYPASS_RESTRICTION);

	if (IS_ERR(key)) {
		pr_err("Problem with revocation key (%ld)\n", PTR_ERR(key));
		return PTR_ERR(key);
	}

	return 0;
}

/**
 * is_key_on_revocation_list - Determine if the key for a PKCS#7 message is revoked
 * @pkcs7: The PKCS#7 message to check
 */
int is_key_on_revocation_list(struct pkcs7_message *pkcs7)
{
	int ret;

	ret = pkcs7_validate_trust(pkcs7, blacklist_keyring);

	if (ret == 0)
		return -EKEYREJECTED;

	return -ENOKEY;
}
#endif

static int restrict_link_for_blacklist(struct key *dest_keyring,
		const struct key_type *type, const union key_payload *payload,
		struct key *restrict_key)
{
	if (type == &key_type_blacklist)
		return 0;
	return -EOPNOTSUPP;
}

/*
 * Initialise the blacklist
 *
 * The blacklist_init() function is registered as an initcall via
 * device_initcall().  As a result if the blacklist_init() function fails for
 * any reason the kernel continues to execute.  While cleanly returning -ENODEV
 * could be acceptable for some non-critical kernel parts, if the blacklist
 * keyring fails to load it defeats the certificate/key based deny list for
 * signed modules.  If a critical piece of security functionality that users
 * expect to be present fails to initialize, panic()ing is likely the right
 * thing to do.
 */
static int __init blacklist_init(void)
{
	const char *const *bl;
	struct key_restriction *restriction;

	if (register_key_type(&key_type_blacklist) < 0)
		panic("Can't allocate system blacklist key type\n");

	restriction = kzalloc(sizeof(*restriction), GFP_KERNEL);
	if (!restriction)
		panic("Can't allocate blacklist keyring restriction\n");
	restriction->check = restrict_link_for_blacklist;

	blacklist_keyring =
		keyring_alloc(".blacklist",
			      GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, current_cred(),
			      KEY_POS_VIEW | KEY_POS_READ | KEY_POS_SEARCH |
			      KEY_POS_WRITE |
			      KEY_USR_VIEW | KEY_USR_READ | KEY_USR_SEARCH
#ifdef CONFIG_SYSTEM_BLACKLIST_AUTH_UPDATE
			      | KEY_USR_WRITE
#endif
			      , KEY_ALLOC_NOT_IN_QUOTA |
			      KEY_ALLOC_SET_KEEP,
			      restriction, NULL);
	if (IS_ERR(blacklist_keyring))
		panic("Can't allocate system blacklist keyring\n");

	for (bl = blacklist_hashes; *bl; bl++)
		if (mark_raw_hash_blacklisted(*bl) < 0)
			pr_err("- blacklisting failed\n");
	return 0;
}

/*
 * Must be initialised before we try and load the keys into the keyring.
 */
device_initcall(blacklist_init);

#ifdef CONFIG_SYSTEM_REVOCATION_LIST
/*
 * Load the compiled-in list of revocation X.509 certificates.
 */
static __init int load_revocation_certificate_list(void)
{
	if (revocation_certificate_list_size)
		pr_notice("Loading compiled-in revocation X.509 certificates\n");

	return x509_load_certificate_list(revocation_certificate_list,
					  revocation_certificate_list_size,
					  blacklist_keyring);
}
late_initcall(load_revocation_certificate_list);
#endif
Commit	Line	Data
b4d0d230	1	// SPDX-License-Identifier: GPL-2.0-or-later
734114f8 DH	2	/* System hash blacklist.
	3	*
	4	* Copyright (C) 2016 Red Hat, Inc. All Rights Reserved.
	5	* Written by David Howells (dhowells@redhat.com)
734114f8 DH	6	*/
	7
	8	#define pr_fmt(fmt) "blacklist: "fmt
	9	#include <linux/module.h>
	10	#include <linux/slab.h>
	11	#include <linux/key.h>
	12	#include <linux/key-type.h>
	13	#include <linux/sched.h>
	14	#include <linux/ctype.h>
	15	#include <linux/err.h>
	16	#include <linux/seq_file.h>
a6cb0ab7	17	#include <linux/uidgid.h>
60050ffe	18	#include <keys/asymmetric-type.h>
734114f8 DH	19	#include <keys/system_keyring.h>
	20	#include "blacklist.h"
	21
bf21dc59 MS	22	/*
	23	* According to crypto/asymmetric_keys/x509_cert_parser.c:x509_note_pkey_algo(),
	24	* the size of the currently longest supported hash algorithm is 512 bits,
	25	* which translates into 128 hex characters.
	26	*/
	27	#define MAX_HASH_LEN 128
	28
6364d106 MS	29	#define BLACKLIST_KEY_PERM (KEY_POS_SEARCH \| KEY_POS_VIEW \| \
	30	KEY_USR_SEARCH \| KEY_USR_VIEW)
	31
bf21dc59 MS	32	static const char tbs_prefix[] = "tbs";
	33	static const char bin_prefix[] = "bin";
	34
734114f8 DH	35	static struct key *blacklist_keyring;
734114f8 DH	36
d1f04410 ES	37	#ifdef CONFIG_SYSTEM_REVOCATION_LIST
	38	extern __initconst const u8 revocation_certificate_list[];
	39	extern __initconst const unsigned long revocation_certificate_list_size;
	40	#endif
	41
734114f8 DH	42	/*
	43	* The description must be a type prefix, a colon and then an even number of
	44	* hex digits. The hash is kept in the description.
	45	*/
	46	static int blacklist_vet_description(const char *desc)
	47	{
bf21dc59	48	int i, prefix_len, tbs_step = 0, bin_step = 0;
734114f8	49
bf21dc59 MS	50	/* The following algorithm only works if prefix lengths match. */
	51	BUILD_BUG_ON(sizeof(tbs_prefix) != sizeof(bin_prefix));
	52	prefix_len = sizeof(tbs_prefix) - 1;
	53	for (i = 0; *desc; desc++, i++) {
	54	if (*desc == ':') {
	55	if (tbs_step == prefix_len)
	56	goto found_colon;
	57	if (bin_step == prefix_len)
	58	goto found_colon;
	59	return -EINVAL;
	60	}
	61	if (i >= prefix_len)
	62	return -EINVAL;
	63	if (*desc == tbs_prefix[i])
	64	tbs_step++;
	65	if (*desc == bin_prefix[i])
	66	bin_step++;
	67	}
734114f8 DH	68	return -EINVAL;
	69
	70	found_colon:
	71	desc++;
bf21dc59	72	for (i = 0; *desc && i < MAX_HASH_LEN; desc++, i++) {
84ffbefd	73	if (!isxdigit(desc) \|\| isupper(desc))
734114f8	74	return -EINVAL;
734114f8	75	}
bf21dc59 MS	76	if (*desc)
	77	/* The hash is greater than MAX_HASH_LEN. */
	78	return -ENOPKG;
734114f8	79
bf21dc59 MS	80	/* Checks for an even number of hexadecimal characters. */
bf21dc59 MS	81	if (i == 0 \|\| i & 1)
734114f8 DH	82	return -EINVAL;
	83	return 0;
	84	}
	85
6364d106 MS	86	static int blacklist_key_instantiate(struct key *key,
6364d106 MS	87	struct key_preparsed_payload *prep)
734114f8	88	{
6364d106 MS	89	#ifdef CONFIG_SYSTEM_BLACKLIST_AUTH_UPDATE
	90	int err;
	91	#endif
	92
	93	/* Sets safe default permissions for keys loaded by user space. */
	94	key->perm = BLACKLIST_KEY_PERM;
	95
	96	/*
	97	* Skips the authentication step for builtin hashes, they are not
	98	* signed but still trusted.
	99	*/
	100	if (key->flags & (1 << KEY_FLAG_BUILTIN))
	101	goto out;
	102
	103	#ifdef CONFIG_SYSTEM_BLACKLIST_AUTH_UPDATE
	104	/*
	105	* Verifies the description's PKCS#7 signature against the builtin
	106	* trusted keyring.
	107	*/
	108	err = verify_pkcs7_signature(key->description,
	109	strlen(key->description), prep->data, prep->datalen,
	110	NULL, VERIFYING_UNSPECIFIED_SIGNATURE, NULL, NULL);
	111	if (err)
	112	return err;
	113	#else
	114	/*
	115	* It should not be possible to come here because the keyring doesn't
	116	* have KEY_USR_WRITE and the only other way to call this function is
	117	* for builtin hashes.
	118	*/
	119	WARN_ON_ONCE(1);
	120	return -EPERM;
	121	#endif
	122
	123	out:
	124	return generic_key_instantiate(key, prep);
734114f8 DH	125	}
734114f8 DH	126
6364d106 MS	127	static int blacklist_key_update(struct key *key,
6364d106 MS	128	struct key_preparsed_payload *prep)
734114f8	129	{
6364d106	130	return -EPERM;
734114f8 DH	131	}
	132
	133	static void blacklist_describe(const struct key key, struct seq_file m)
	134	{
	135	seq_puts(m, key->description);
	136	}
	137
	138	static struct key_type key_type_blacklist = {
	139	.name = "blacklist",
	140	.vet_description = blacklist_vet_description,
6364d106 MS	141	.instantiate = blacklist_key_instantiate,
6364d106 MS	142	.update = blacklist_key_update,
734114f8 DH	143	.describe = blacklist_describe,
	144	};
	145
141e5239 MS	146	static char get_raw_hash(const u8 hash, size_t hash_len,
	147	enum blacklist_hash_type hash_type)
	148	{
	149	size_t type_len;
	150	const char *type_prefix;
	151	char buffer, p;
	152
	153	switch (hash_type) {
	154	case BLACKLIST_HASH_X509_TBS:
	155	type_len = sizeof(tbs_prefix) - 1;
	156	type_prefix = tbs_prefix;
	157	break;
	158	case BLACKLIST_HASH_BINARY:
	159	type_len = sizeof(bin_prefix) - 1;
	160	type_prefix = bin_prefix;
	161	break;
	162	default:
	163	WARN_ON_ONCE(1);
	164	return ERR_PTR(-EINVAL);
	165	}
	166	buffer = kmalloc(type_len + 1 + hash_len * 2 + 1, GFP_KERNEL);
	167	if (!buffer)
	168	return ERR_PTR(-ENOMEM);
	169	p = memcpy(buffer, type_prefix, type_len);
	170	p += type_len;
	171	*p++ = ':';
	172	bin2hex(p, hash, hash_len);
	173	p += hash_len * 2;
	174	*p = '\0';
	175	return buffer;
	176	}
	177
734114f8	178	/**
141e5239	179	* mark_raw_hash_blacklisted - Add a hash to the system blacklist
0b2d443b	180	* @hash: The hash as a hex string with a type prefix (eg. "tbs:23aa429783")
734114f8	181	*/
141e5239	182	static int mark_raw_hash_blacklisted(const char *hash)
734114f8 DH	183	{
	184	key_ref_t key;
	185
c95e8f6f TW	186	key = key_create(make_key_ref(blacklist_keyring, true),
	187	"blacklist",
	188	hash,
	189	NULL,
	190	0,
	191	BLACKLIST_KEY_PERM,
	192	KEY_ALLOC_NOT_IN_QUOTA \|
	193	KEY_ALLOC_BUILT_IN);
734114f8	194	if (IS_ERR(key)) {
c95e8f6f TW	195	if (PTR_ERR(key) == -EEXIST)
	196	pr_warn("Duplicate blacklisted hash %s\n", hash);
	197	else
	198	pr_err("Problem blacklisting hash %s: %pe\n", hash, key);
734114f8 DH	199	return PTR_ERR(key);
	200	}
	201	return 0;
	202	}
	203
141e5239 MS	204	int mark_hash_blacklisted(const u8 *hash, size_t hash_len,
	205	enum blacklist_hash_type hash_type)
	206	{
	207	const char *buffer;
	208	int err;
	209
	210	buffer = get_raw_hash(hash, hash_len, hash_type);
	211	if (IS_ERR(buffer))
	212	return PTR_ERR(buffer);
	213	err = mark_raw_hash_blacklisted(buffer);
	214	kfree(buffer);
	215	return err;
	216	}
	217
734114f8 DH	218	/**
	219	* is_hash_blacklisted - Determine if a hash is blacklisted
	220	* @hash: The hash to be checked as a binary blob
	221	* @hash_len: The length of the binary hash
141e5239	222	* @hash_type: Type of hash
734114f8	223	*/
141e5239 MS	224	int is_hash_blacklisted(const u8 *hash, size_t hash_len,
141e5239 MS	225	enum blacklist_hash_type hash_type)
734114f8 DH	226	{
734114f8 DH	227	key_ref_t kref;
141e5239	228	const char *buffer;
734114f8 DH	229	int ret = 0;
734114f8 DH	230
141e5239 MS	231	buffer = get_raw_hash(hash, hash_len, hash_type);
	232	if (IS_ERR(buffer))
	233	return PTR_ERR(buffer);
734114f8	234	kref = keyring_search(make_key_ref(blacklist_keyring, true),
dcf49dbc	235	&key_type_blacklist, buffer, false);
734114f8 DH	236	if (!IS_ERR(kref)) {
	237	key_ref_put(kref);
	238	ret = -EKEYREJECTED;
	239	}
	240
	241	kfree(buffer);
	242	return ret;
	243	}
	244	EXPORT_SYMBOL_GPL(is_hash_blacklisted);
	245
2434f7d2 NJ	246	int is_binary_blacklisted(const u8 *hash, size_t hash_len)
2434f7d2 NJ	247	{
141e5239 MS	248	if (is_hash_blacklisted(hash, hash_len, BLACKLIST_HASH_BINARY) ==
141e5239 MS	249	-EKEYREJECTED)
2434f7d2 NJ	250	return -EPERM;
	251
	252	return 0;
	253	}
	254	EXPORT_SYMBOL_GPL(is_binary_blacklisted);
	255
56c58126 ES	256	#ifdef CONFIG_SYSTEM_REVOCATION_LIST
	257	/**
	258	* add_key_to_revocation_list - Add a revocation certificate to the blacklist
	259	* @data: The data blob containing the certificate
	260	* @size: The size of data blob
	261	*/
	262	int add_key_to_revocation_list(const char *data, size_t size)
	263	{
	264	key_ref_t key;
	265
	266	key = key_create_or_update(make_key_ref(blacklist_keyring, true),
	267	"asymmetric",
	268	NULL,
	269	data,
	270	size,
6364d106 MS	271	KEY_POS_VIEW \| KEY_POS_READ \| KEY_POS_SEARCH
	272	\| KEY_USR_VIEW,
	273	KEY_ALLOC_NOT_IN_QUOTA \| KEY_ALLOC_BUILT_IN
	274	\| KEY_ALLOC_BYPASS_RESTRICTION);
56c58126 ES	275
	276	if (IS_ERR(key)) {
	277	pr_err("Problem with revocation key (%ld)\n", PTR_ERR(key));
	278	return PTR_ERR(key);
	279	}
	280
	281	return 0;
	282	}
	283
	284	/**
	285	* is_key_on_revocation_list - Determine if the key for a PKCS#7 message is revoked
	286	* @pkcs7: The PKCS#7 message to check
	287	*/
	288	int is_key_on_revocation_list(struct pkcs7_message *pkcs7)
	289	{
	290	int ret;
	291
	292	ret = pkcs7_validate_trust(pkcs7, blacklist_keyring);
	293
	294	if (ret == 0)
	295	return -EKEYREJECTED;
	296
	297	return -ENOKEY;
	298	}
	299	#endif
	300
6364d106 MS	301	static int restrict_link_for_blacklist(struct key *dest_keyring,
	302	const struct key_type type, const union key_payload payload,
	303	struct key *restrict_key)
	304	{
	305	if (type == &key_type_blacklist)
	306	return 0;
	307	return -EOPNOTSUPP;
	308	}
	309
734114f8	310	/*
6e7c2b4d	311	* Initialise the blacklist
4d997501 MS	312	*
	313	* The blacklist_init() function is registered as an initcall via
	314	* device_initcall(). As a result if the blacklist_init() function fails for
	315	* any reason the kernel continues to execute. While cleanly returning -ENODEV
	316	* could be acceptable for some non-critical kernel parts, if the blacklist
	317	* keyring fails to load it defeats the certificate/key based deny list for
	318	* signed modules. If a critical piece of security functionality that users
	319	* expect to be present fails to initialize, panic()ing is likely the right
	320	* thing to do.
734114f8 DH	321	*/
	322	static int __init blacklist_init(void)
	323	{
	324	const char const bl;
6364d106	325	struct key_restriction *restriction;
734114f8 DH	326
	327	if (register_key_type(&key_type_blacklist) < 0)
	328	panic("Can't allocate system blacklist key type\n");
	329
6364d106 MS	330	restriction = kzalloc(sizeof(*restriction), GFP_KERNEL);
	331	if (!restriction)
	332	panic("Can't allocate blacklist keyring restriction\n");
	333	restriction->check = restrict_link_for_blacklist;
	334
734114f8 DH	335	blacklist_keyring =
734114f8 DH	336	keyring_alloc(".blacklist",
a6cb0ab7	337	GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, current_cred(),
6364d106 MS	338	KEY_POS_VIEW \| KEY_POS_READ \| KEY_POS_SEARCH \|
	339	KEY_POS_WRITE \|
	340	KEY_USR_VIEW \| KEY_USR_READ \| KEY_USR_SEARCH
	341	#ifdef CONFIG_SYSTEM_BLACKLIST_AUTH_UPDATE
	342	\| KEY_USR_WRITE
	343	#endif
	344	, KEY_ALLOC_NOT_IN_QUOTA \|
4993e1f9	345	KEY_ALLOC_SET_KEEP,
6364d106	346	restriction, NULL);
734114f8 DH	347	if (IS_ERR(blacklist_keyring))
	348	panic("Can't allocate system blacklist keyring\n");
	349
	350	for (bl = blacklist_hashes; *bl; bl++)
141e5239	351	if (mark_raw_hash_blacklisted(*bl) < 0)
734114f8 DH	352	pr_err("- blacklisting failed\n");
	353	return 0;
	354	}
	355
	356	/*
	357	* Must be initialised before we try and load the keys into the keyring.
	358	*/
	359	device_initcall(blacklist_init);
d1f04410 ES	360
	361	#ifdef CONFIG_SYSTEM_REVOCATION_LIST
	362	/*
	363	* Load the compiled-in list of revocation X.509 certificates.
	364	*/
	365	static __init int load_revocation_certificate_list(void)
	366	{
	367	if (revocation_certificate_list_size)
	368	pr_notice("Loading compiled-in revocation X.509 certificates\n");
	369
60050ffe DH	370	return x509_load_certificate_list(revocation_certificate_list,
	371	revocation_certificate_list_size,
	372	blacklist_keyring);
d1f04410 ES	373	}
	374	late_initcall(load_revocation_certificate_list);
	375	#endif