[mirror_ubuntu-zesty-kernel.git] / security / keys / internal.h

/* Authentication token and access key management internal defs
 *
 * Copyright (C) 2003-5, 2007 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 License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#ifndef _INTERNAL_H
#define _INTERNAL_H

#include <linux/sched.h>
#include <linux/key-type.h>
#include <linux/task_work.h>
#include <linux/keyctl.h>

struct iovec;

#ifdef __KDEBUG
#define kenter(FMT, ...) \
	printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)
#define kleave(FMT, ...) \
	printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
#define kdebug(FMT, ...) \
	printk(KERN_DEBUG "   "FMT"\n", ##__VA_ARGS__)
#else
#define kenter(FMT, ...) \
	no_printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)
#define kleave(FMT, ...) \
	no_printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
#define kdebug(FMT, ...) \
	no_printk(KERN_DEBUG FMT"\n", ##__VA_ARGS__)
#endif

extern struct key_type key_type_dead;
extern struct key_type key_type_user;
extern struct key_type key_type_logon;

/*****************************************************************************/
/*
 * Keep track of keys for a user.
 *
 * This needs to be separate to user_struct to avoid a refcount-loop
 * (user_struct pins some keyrings which pin this struct).
 *
 * We also keep track of keys under request from userspace for this UID here.
 */
struct key_user {
	struct rb_node		node;
	struct mutex		cons_lock;	/* construction initiation lock */
	spinlock_t		lock;
	atomic_t		usage;		/* for accessing qnkeys & qnbytes */
	atomic_t		nkeys;		/* number of keys */
	atomic_t		nikeys;		/* number of instantiated keys */
	kuid_t			uid;
	int			qnkeys;		/* number of keys allocated to this user */
	int			qnbytes;	/* number of bytes allocated to this user */
};

extern struct rb_root	key_user_tree;
extern spinlock_t	key_user_lock;
extern struct key_user	root_key_user;

extern struct key_user *key_user_lookup(kuid_t uid);
extern void key_user_put(struct key_user *user);

/*
 * Key quota limits.
 * - root has its own separate limits to everyone else
 */
extern unsigned key_quota_root_maxkeys;
extern unsigned key_quota_root_maxbytes;
extern unsigned key_quota_maxkeys;
extern unsigned key_quota_maxbytes;

#define KEYQUOTA_LINK_BYTES	4		/* a link in a keyring is worth 4 bytes */


extern struct kmem_cache *key_jar;
extern struct rb_root key_serial_tree;
extern spinlock_t key_serial_lock;
extern struct mutex key_construction_mutex;
extern wait_queue_head_t request_key_conswq;


extern struct key_type *key_type_lookup(const char *type);
extern void key_type_put(struct key_type *ktype);

extern int __key_link_begin(struct key *keyring,
			    const struct keyring_index_key *index_key,
			    struct assoc_array_edit **_edit);
extern int __key_link_check_live_key(struct key *keyring, struct key *key);
extern void __key_link(struct key *key, struct assoc_array_edit **_edit);
extern void __key_link_end(struct key *keyring,
			   const struct keyring_index_key *index_key,
			   struct assoc_array_edit *edit);

extern key_ref_t find_key_to_update(key_ref_t keyring_ref,
				    const struct keyring_index_key *index_key);

extern struct key *keyring_search_instkey(struct key *keyring,
					  key_serial_t target_id);

extern int iterate_over_keyring(const struct key *keyring,
				int (*func)(const struct key *key, void *data),
				void *data);

struct keyring_search_context {
	struct keyring_index_key index_key;
	const struct cred	*cred;
	struct key_match_data	match_data;
	unsigned		flags;
#define KEYRING_SEARCH_NO_STATE_CHECK	0x0001	/* Skip state checks */
#define KEYRING_SEARCH_DO_STATE_CHECK	0x0002	/* Override NO_STATE_CHECK */
#define KEYRING_SEARCH_NO_UPDATE_TIME	0x0004	/* Don't update times */
#define KEYRING_SEARCH_NO_CHECK_PERM	0x0008	/* Don't check permissions */
#define KEYRING_SEARCH_DETECT_TOO_DEEP	0x0010	/* Give an error on excessive depth */
#define KEYRING_SEARCH_SKIP_EXPIRED	0x0020	/* Ignore expired keys (intention to replace) */

	int (*iterator)(const void *object, void *iterator_data);

	/* Internal stuff */
	int			skipped_ret;
	bool			possessed;
	key_ref_t		result;
	struct timespec		now;
};

extern bool key_default_cmp(const struct key *key,
			    const struct key_match_data *match_data);
extern key_ref_t keyring_search_aux(key_ref_t keyring_ref,
				    struct keyring_search_context *ctx);

extern key_ref_t search_my_process_keyrings(struct keyring_search_context *ctx);
extern key_ref_t search_process_keyrings(struct keyring_search_context *ctx);

extern struct key *find_keyring_by_name(const char *name, bool skip_perm_check);

extern int install_user_keyrings(void);
extern int install_thread_keyring_to_cred(struct cred *);
extern int install_process_keyring_to_cred(struct cred *);
extern int install_session_keyring_to_cred(struct cred *, struct key *);

extern struct key *request_key_and_link(struct key_type *type,
					const char *description,
					const void *callout_info,
					size_t callout_len,
					void *aux,
					struct key *dest_keyring,
					unsigned long flags);

extern bool lookup_user_key_possessed(const struct key *key,
				      const struct key_match_data *match_data);
extern key_ref_t lookup_user_key(key_serial_t id, unsigned long flags,
				 key_perm_t perm);
#define KEY_LOOKUP_CREATE	0x01
#define KEY_LOOKUP_PARTIAL	0x02
#define KEY_LOOKUP_FOR_UNLINK	0x04

extern long join_session_keyring(const char *name);
extern void key_change_session_keyring(struct callback_head *twork);

extern struct work_struct key_gc_work;
extern unsigned key_gc_delay;
extern void keyring_gc(struct key *keyring, time_t limit);
extern void key_schedule_gc(time_t gc_at);
extern void key_schedule_gc_links(void);
extern void key_gc_keytype(struct key_type *ktype);

extern int key_task_permission(const key_ref_t key_ref,
			       const struct cred *cred,
			       key_perm_t perm);

/*
 * Check to see whether permission is granted to use a key in the desired way.
 */
static inline int key_permission(const key_ref_t key_ref, unsigned perm)
{
	return key_task_permission(key_ref, current_cred(), perm);
}

/*
 * Authorisation record for request_key().
 */
struct request_key_auth {
	struct key		*target_key;
	struct key		*dest_keyring;
	const struct cred	*cred;
	void			*callout_info;
	size_t			callout_len;
	pid_t			pid;
};

extern struct key_type key_type_request_key_auth;
extern struct key *request_key_auth_new(struct key *target,
					const void *callout_info,
					size_t callout_len,
					struct key *dest_keyring);

extern struct key *key_get_instantiation_authkey(key_serial_t target_id);

/*
 * Determine whether a key is dead.
 */
static inline bool key_is_dead(const struct key *key, time_t limit)
{
	return
		key->flags & ((1 << KEY_FLAG_DEAD) |
			      (1 << KEY_FLAG_INVALIDATED)) ||
		(key->expiry > 0 && key->expiry <= limit);
}

/*
 * keyctl() functions
 */
extern long keyctl_get_keyring_ID(key_serial_t, int);
extern long keyctl_join_session_keyring(const char __user *);
extern long keyctl_update_key(key_serial_t, const void __user *, size_t);
extern long keyctl_revoke_key(key_serial_t);
extern long keyctl_keyring_clear(key_serial_t);
extern long keyctl_keyring_link(key_serial_t, key_serial_t);
extern long keyctl_keyring_unlink(key_serial_t, key_serial_t);
extern long keyctl_describe_key(key_serial_t, char __user *, size_t);
extern long keyctl_keyring_search(key_serial_t, const char __user *,
				  const char __user *, key_serial_t);
extern long keyctl_read_key(key_serial_t, char __user *, size_t);
extern long keyctl_chown_key(key_serial_t, uid_t, gid_t);
extern long keyctl_setperm_key(key_serial_t, key_perm_t);
extern long keyctl_instantiate_key(key_serial_t, const void __user *,
				   size_t, key_serial_t);
extern long keyctl_negate_key(key_serial_t, unsigned, key_serial_t);
extern long keyctl_set_reqkey_keyring(int);
extern long keyctl_set_timeout(key_serial_t, unsigned);
extern long keyctl_assume_authority(key_serial_t);
extern long keyctl_get_security(key_serial_t keyid, char __user *buffer,
				size_t buflen);
extern long keyctl_session_to_parent(void);
extern long keyctl_reject_key(key_serial_t, unsigned, unsigned, key_serial_t);
extern long keyctl_instantiate_key_iov(key_serial_t,
				       const struct iovec __user *,
				       unsigned, key_serial_t);
extern long keyctl_invalidate_key(key_serial_t);

struct iov_iter;
extern long keyctl_instantiate_key_common(key_serial_t,
					  struct iov_iter *,
					  key_serial_t);
#ifdef CONFIG_PERSISTENT_KEYRINGS
extern long keyctl_get_persistent(uid_t, key_serial_t);
extern unsigned persistent_keyring_expiry;
#else
static inline long keyctl_get_persistent(uid_t uid, key_serial_t destring)
{
	return -EOPNOTSUPP;
}
#endif

#ifdef CONFIG_KEY_DH_OPERATIONS
extern long keyctl_dh_compute(struct keyctl_dh_params __user *, char __user *,
			      size_t, void __user *);
#else
static inline long keyctl_dh_compute(struct keyctl_dh_params __user *params,
				     char __user *buffer, size_t buflen,
				     void __user *reserved)
{
	return -EOPNOTSUPP;
}
#endif

/*
 * Debugging key validation
 */
#ifdef KEY_DEBUGGING
extern void __key_check(const struct key *);

static inline void key_check(const struct key *key)
{
	if (key && (IS_ERR(key) || key->magic != KEY_DEBUG_MAGIC))
		__key_check(key);
}

#else

#define key_check(key) do {} while(0)

#endif

#endif /* _INTERNAL_H */
Commit	Line	Data
973c9f4f	1	/* Authentication token and access key management internal defs
1da177e4	2	*
76181c13	3	* Copyright (C) 2003-5, 2007 Red Hat, Inc. All Rights Reserved.
1da177e4 LT	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 License
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the License, or (at your option) any later version.
	10	*/
	11
	12	#ifndef _INTERNAL_H
	13	#define _INTERNAL_H
	14
d84f4f99	15	#include <linux/sched.h>
76181c13	16	#include <linux/key-type.h>
413cd3d9	17	#include <linux/task_work.h>
ddbb4114	18	#include <linux/keyctl.h>
1da177e4	19
a27bb332 KO	20	struct iovec;
a27bb332 KO	21
76181c13 DH	22	#ifdef __KDEBUG
76181c13 DH	23	#define kenter(FMT, ...) \
dd6f953a	24	printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)
76181c13	25	#define kleave(FMT, ...) \
dd6f953a	26	printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
76181c13	27	#define kdebug(FMT, ...) \
d84f4f99	28	printk(KERN_DEBUG " "FMT"\n", ##__VA_ARGS__)
3e30148c	29	#else
76181c13	30	#define kenter(FMT, ...) \
dd6f953a	31	no_printk(KERN_DEBUG "==> %s("FMT")\n", __func__, ##__VA_ARGS__)
76181c13	32	#define kleave(FMT, ...) \
dd6f953a	33	no_printk(KERN_DEBUG "<== %s()"FMT"\n", __func__, ##__VA_ARGS__)
76181c13 DH	34	#define kdebug(FMT, ...) \
76181c13 DH	35	no_printk(KERN_DEBUG FMT"\n", ##__VA_ARGS__)
3e30148c DH	36	#endif
3e30148c DH	37
0c061b57	38	extern struct key_type key_type_dead;
1da177e4	39	extern struct key_type key_type_user;
9f6ed2ca	40	extern struct key_type key_type_logon;
1da177e4 LT	41
	42	/*****************************************************************************/
	43	/*
973c9f4f DH	44	* Keep track of keys for a user.
	45	*
	46	* This needs to be separate to user_struct to avoid a refcount-loop
	47	* (user_struct pins some keyrings which pin this struct).
	48	*
	49	* We also keep track of keys under request from userspace for this UID here.
1da177e4 LT	50	*/
	51	struct key_user {
	52	struct rb_node node;
76181c13	53	struct mutex cons_lock; /* construction initiation lock */
1da177e4 LT	54	spinlock_t lock;
	55	atomic_t usage; /* for accessing qnkeys & qnbytes */
	56	atomic_t nkeys; /* number of keys */
	57	atomic_t nikeys; /* number of instantiated keys */
9a56c2db	58	kuid_t uid;
1da177e4 LT	59	int qnkeys; /* number of keys allocated to this user */
	60	int qnbytes; /* number of bytes allocated to this user */
	61	};
	62
1da177e4 LT	63	extern struct rb_root key_user_tree;
	64	extern spinlock_t key_user_lock;
	65	extern struct key_user root_key_user;
	66
9a56c2db	67	extern struct key_user *key_user_lookup(kuid_t uid);
1da177e4 LT	68	extern void key_user_put(struct key_user *user);
1da177e4 LT	69
0b77f5bf	70	/*
973c9f4f	71	* Key quota limits.
0b77f5bf DH	72	* - root has its own separate limits to everyone else
	73	*/
	74	extern unsigned key_quota_root_maxkeys;
	75	extern unsigned key_quota_root_maxbytes;
	76	extern unsigned key_quota_maxkeys;
	77	extern unsigned key_quota_maxbytes;
	78
	79	#define KEYQUOTA_LINK_BYTES 4 /* a link in a keyring is worth 4 bytes */
1da177e4 LT	80
1da177e4 LT	81
8bc16dea	82	extern struct kmem_cache *key_jar;
1da177e4 LT	83	extern struct rb_root key_serial_tree;
1da177e4 LT	84	extern spinlock_t key_serial_lock;
76181c13	85	extern struct mutex key_construction_mutex;
1da177e4 LT	86	extern wait_queue_head_t request_key_conswq;
	87
	88
e9e349b0 DH	89	extern struct key_type key_type_lookup(const char type);
	90	extern void key_type_put(struct key_type *ktype);
	91
f70e2e06	92	extern int __key_link_begin(struct key *keyring,
16feef43	93	const struct keyring_index_key *index_key,
b2a4df20	94	struct assoc_array_edit **_edit);
f70e2e06	95	extern int __key_link_check_live_key(struct key keyring, struct key key);
b2a4df20	96	extern void __key_link(struct key key, struct assoc_array_edit *_edit);
f70e2e06	97	extern void __key_link_end(struct key *keyring,
16feef43	98	const struct keyring_index_key *index_key,
b2a4df20	99	struct assoc_array_edit *edit);
1da177e4	100
b2a4df20 DH	101	extern key_ref_t find_key_to_update(key_ref_t keyring_ref,
b2a4df20 DH	102	const struct keyring_index_key *index_key);
1da177e4	103
3e30148c DH	104	extern struct key keyring_search_instkey(struct key keyring,
	105	key_serial_t target_id);
	106
b2a4df20 DH	107	extern int iterate_over_keyring(const struct key *keyring,
	108	int (func)(const struct key key, void *data),
	109	void *data);
	110
4bdf0bc3 DH	111	struct keyring_search_context {
	112	struct keyring_index_key index_key;
	113	const struct cred *cred;
46291959	114	struct key_match_data match_data;
4bdf0bc3	115	unsigned flags;
614d8c39 DH	116	#define KEYRING_SEARCH_NO_STATE_CHECK 0x0001 /* Skip state checks */
	117	#define KEYRING_SEARCH_DO_STATE_CHECK 0x0002 /* Override NO_STATE_CHECK */
	118	#define KEYRING_SEARCH_NO_UPDATE_TIME 0x0004 /* Don't update times */
	119	#define KEYRING_SEARCH_NO_CHECK_PERM 0x0008 /* Don't check permissions */
	120	#define KEYRING_SEARCH_DETECT_TOO_DEEP 0x0010 /* Give an error on excessive depth */
0b0a8415	121	#define KEYRING_SEARCH_SKIP_EXPIRED 0x0020 /* Ignore expired keys (intention to replace) */
4bdf0bc3	122
b2a4df20 DH	123	int (iterator)(const void object, void *iterator_data);
b2a4df20 DH	124
4bdf0bc3 DH	125	/* Internal stuff */
	126	int skipped_ret;
	127	bool possessed;
	128	key_ref_t result;
	129	struct timespec now;
	130	};
	131
0c903ab6 DH	132	extern bool key_default_cmp(const struct key *key,
0c903ab6 DH	133	const struct key_match_data *match_data);
664cceb0	134	extern key_ref_t keyring_search_aux(key_ref_t keyring_ref,
4bdf0bc3 DH	135	struct keyring_search_context *ctx);
	136
	137	extern key_ref_t search_my_process_keyrings(struct keyring_search_context *ctx);
	138	extern key_ref_t search_process_keyrings(struct keyring_search_context *ctx);
1da177e4	139
69664cf1	140	extern struct key find_keyring_by_name(const char name, bool skip_perm_check);
1da177e4	141
8bbf4976	142	extern int install_user_keyrings(void);
d84f4f99 DH	143	extern int install_thread_keyring_to_cred(struct cred *);
d84f4f99 DH	144	extern int install_process_keyring_to_cred(struct cred *);
685bfd2c	145	extern int install_session_keyring_to_cred(struct cred , struct key );
3e30148c DH	146
	147	extern struct key request_key_and_link(struct key_type type,
	148	const char *description,
4a38e122 DH	149	const void *callout_info,
4a38e122 DH	150	size_t callout_len,
4e54f085	151	void *aux,
7e047ef5 DH	152	struct key *dest_keyring,
7e047ef5 DH	153	unsigned long flags);
3e30148c	154
0c903ab6 DH	155	extern bool lookup_user_key_possessed(const struct key *key,
0c903ab6 DH	156	const struct key_match_data *match_data);
5593122e	157	extern key_ref_t lookup_user_key(key_serial_t id, unsigned long flags,
e9e349b0	158	key_perm_t perm);
5593122e DH	159	#define KEY_LOOKUP_CREATE 0x01
	160	#define KEY_LOOKUP_PARTIAL 0x02
	161	#define KEY_LOOKUP_FOR_UNLINK 0x04
e9e349b0 DH	162
e9e349b0 DH	163	extern long join_session_keyring(const char *name);
67d12145	164	extern void key_change_session_keyring(struct callback_head *twork);
e9e349b0	165
0c061b57	166	extern struct work_struct key_gc_work;
5d135440 DH	167	extern unsigned key_gc_delay;
5d135440 DH	168	extern void keyring_gc(struct key *keyring, time_t limit);
fd75815f DH	169	extern void key_schedule_gc(time_t gc_at);
fd75815f DH	170	extern void key_schedule_gc_links(void);
0c061b57	171	extern void key_gc_keytype(struct key_type *ktype);
5d135440	172
e9e349b0	173	extern int key_task_permission(const key_ref_t key_ref,
d84f4f99	174	const struct cred *cred,
e9e349b0 DH	175	key_perm_t perm);
e9e349b0 DH	176
973c9f4f DH	177	/*
	178	* Check to see whether permission is granted to use a key in the desired way.
	179	*/
f5895943	180	static inline int key_permission(const key_ref_t key_ref, unsigned perm)
e9e349b0	181	{
d84f4f99	182	return key_task_permission(key_ref, current_cred(), perm);
e9e349b0 DH	183	}
e9e349b0 DH	184
3e30148c	185	/*
973c9f4f	186	* Authorisation record for request_key().
3e30148c DH	187	*/
	188	struct request_key_auth {
	189	struct key *target_key;
8bbf4976	190	struct key *dest_keyring;
d84f4f99	191	const struct cred *cred;
4a38e122 DH	192	void *callout_info;
4a38e122 DH	193	size_t callout_len;
3e30148c DH	194	pid_t pid;
	195	};
	196
	197	extern struct key_type key_type_request_key_auth;
	198	extern struct key request_key_auth_new(struct key target,
4a38e122	199	const void *callout_info,
8bbf4976 DH	200	size_t callout_len,
8bbf4976 DH	201	struct key *dest_keyring);
3e30148c DH	202
3e30148c DH	203	extern struct key *key_get_instantiation_authkey(key_serial_t target_id);
1da177e4	204
fd75815f DH	205	/*
	206	* Determine whether a key is dead.
	207	*/
7e55ca6d	208	static inline bool key_is_dead(const struct key *key, time_t limit)
fd75815f DH	209	{
	210	return
	211	key->flags & ((1 << KEY_FLAG_DEAD) \|
	212	(1 << KEY_FLAG_INVALIDATED)) \|\|
	213	(key->expiry > 0 && key->expiry <= limit);
	214	}
	215
1da177e4	216	/*
973c9f4f	217	* keyctl() functions
1da177e4 LT	218	*/
	219	extern long keyctl_get_keyring_ID(key_serial_t, int);
	220	extern long keyctl_join_session_keyring(const char __user *);
	221	extern long keyctl_update_key(key_serial_t, const void __user *, size_t);
	222	extern long keyctl_revoke_key(key_serial_t);
	223	extern long keyctl_keyring_clear(key_serial_t);
	224	extern long keyctl_keyring_link(key_serial_t, key_serial_t);
	225	extern long keyctl_keyring_unlink(key_serial_t, key_serial_t);
	226	extern long keyctl_describe_key(key_serial_t, char __user *, size_t);
	227	extern long keyctl_keyring_search(key_serial_t, const char __user *,
	228	const char __user *, key_serial_t);
	229	extern long keyctl_read_key(key_serial_t, char __user *, size_t);
	230	extern long keyctl_chown_key(key_serial_t, uid_t, gid_t);
	231	extern long keyctl_setperm_key(key_serial_t, key_perm_t);
	232	extern long keyctl_instantiate_key(key_serial_t, const void __user *,
	233	size_t, key_serial_t);
	234	extern long keyctl_negate_key(key_serial_t, unsigned, key_serial_t);
3e30148c	235	extern long keyctl_set_reqkey_keyring(int);
017679c4	236	extern long keyctl_set_timeout(key_serial_t, unsigned);
b5f545c8	237	extern long keyctl_assume_authority(key_serial_t);
70a5bb72 DH	238	extern long keyctl_get_security(key_serial_t keyid, char __user *buffer,
70a5bb72 DH	239	size_t buflen);
ee18d64c	240	extern long keyctl_session_to_parent(void);
fdd1b945	241	extern long keyctl_reject_key(key_serial_t, unsigned, unsigned, key_serial_t);
ee009e4a DH	242	extern long keyctl_instantiate_key_iov(key_serial_t,
	243	const struct iovec __user *,
	244	unsigned, key_serial_t);
fd75815f	245	extern long keyctl_invalidate_key(key_serial_t);
ee009e4a	246
b353a1f7	247	struct iov_iter;
ee009e4a	248	extern long keyctl_instantiate_key_common(key_serial_t,
b353a1f7 AV	249	struct iov_iter *,
b353a1f7 AV	250	key_serial_t);
f36f8c75 DH	251	#ifdef CONFIG_PERSISTENT_KEYRINGS
	252	extern long keyctl_get_persistent(uid_t, key_serial_t);
	253	extern unsigned persistent_keyring_expiry;
	254	#else
	255	static inline long keyctl_get_persistent(uid_t uid, key_serial_t destring)
	256	{
	257	return -EOPNOTSUPP;
	258	}
	259	#endif
1da177e4	260
ddbb4114 MM	261	#ifdef CONFIG_KEY_DH_OPERATIONS
ddbb4114 MM	262	extern long keyctl_dh_compute(struct keyctl_dh_params __user , char __user ,
4693fc73	263	size_t, void __user *);
ddbb4114 MM	264	#else
ddbb4114 MM	265	static inline long keyctl_dh_compute(struct keyctl_dh_params __user *params,
4693fc73 SM	266	char __user *buffer, size_t buflen,
4693fc73 SM	267	void __user *reserved)
ddbb4114 MM	268	{
	269	return -EOPNOTSUPP;
	270	}
	271	#endif
	272
1da177e4	273	/*
973c9f4f	274	* Debugging key validation
1da177e4 LT	275	*/
	276	#ifdef KEY_DEBUGGING
	277	extern void __key_check(const struct key *);
	278
	279	static inline void key_check(const struct key *key)
	280	{
	281	if (key && (IS_ERR(key) \|\| key->magic != KEY_DEBUG_MAGIC))
	282	__key_check(key);
	283	}
	284
	285	#else
	286
	287	#define key_check(key) do {} while(0)
	288
	289	#endif
	290
	291	#endif /* _INTERNAL_H */