security/keys/internal.h - kernel/msm-5.4 - Gitiles

 /* SPDX-License-Identifier: GPL-2.0-or-later */
 /* 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)
  */

 #ifndef _INTERNAL_H
 #define _INTERNAL_H

 #include <linux/sched.h>
 #include <linux/wait_bit.h>
 #include <linux/cred.h>
 #include <linux/key-type.h>
 #include <linux/task_work.h>
 #include <linux/keyctl.h>
 #include <linux/refcount.h>
 #include <linux/compat.h>
 #include <linux/mm.h>
 #include <linux/vmalloc.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;
 	refcount_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 void key_set_index_key(struct keyring_index_key *index_key);
 extern struct key_type *key_type_lookup(const char *type);
 extern void key_type_put(struct key_type *ktype);

 extern int __key_link_lock(struct key *keyring,
 			   const struct keyring_index_key *index_key);
 extern int __key_move_lock(struct key *l_keyring, struct key *u_keyring,
 			   const struct keyring_index_key *index_key);
 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) */
 #define KEYRING_SEARCH_RECURSE		0x0040	/* Search child keyrings also */

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

 	/* Internal stuff */
 	int			skipped_ret;
 	bool			possessed;
 	key_ref_t		result;
 	time64_t		now;
 };

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

 extern key_ref_t search_cred_keyrings_rcu(struct keyring_search_context *ctx);
 extern key_ref_t search_process_keyrings_rcu(struct keyring_search_context *ctx);

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

 extern int look_up_user_keyrings(struct key **, struct key **);
 extern struct key *get_user_session_keyring_rcu(const struct cred *);
 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,
 					struct key_tag *domain_tag,
 					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);
 #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, time64_t limit);
 extern void keyring_restriction_gc(struct key *keyring,
 				   struct key_type *dead_type);
 extern void key_schedule_gc(time64_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);
 }

 extern struct key_type key_type_request_key_auth;
 extern struct key *request_key_auth_new(struct key *target,
 					const char *op,
 					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, time64_t limit)
 {
 	return
 		key->flags & ((1 << KEY_FLAG_DEAD) |
 			      (1 << KEY_FLAG_INVALIDATED)) ||
 		(key->expiry > 0 && key->expiry <= limit) ||
 		key->domain_tag->removed;
 }

 /*
  * 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_move(key_serial_t, key_serial_t, key_serial_t, unsigned int);
 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);
 extern long keyctl_restrict_keyring(key_serial_t id,
 				    const char __user *_type,
 				    const char __user *_restriction);
 #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, struct keyctl_kdf_params __user *);
 extern long __keyctl_dh_compute(struct keyctl_dh_params __user *, char __user *,
 				size_t, struct keyctl_kdf_params *);
 #ifdef CONFIG_KEYS_COMPAT
 extern long compat_keyctl_dh_compute(struct keyctl_dh_params __user *params,
 				char __user *buffer, size_t buflen,
 				struct compat_keyctl_kdf_params __user *kdf);
 #endif
 #define KEYCTL_KDF_MAX_OUTPUT_LEN	1024	/* max length of KDF output */
 #define KEYCTL_KDF_MAX_OI_LEN		64	/* max length of otherinfo */
 #else
 static inline long keyctl_dh_compute(struct keyctl_dh_params __user *params,
 				     char __user *buffer, size_t buflen,
 				     struct keyctl_kdf_params __user *kdf)
 {
 	return -EOPNOTSUPP;
 }

 #ifdef CONFIG_KEYS_COMPAT
 static inline long compat_keyctl_dh_compute(
 				struct keyctl_dh_params __user *params,
 				char __user *buffer, size_t buflen,
 				struct keyctl_kdf_params __user *kdf)
 {
 	return -EOPNOTSUPP;
 }
 #endif
 #endif

 #ifdef CONFIG_ASYMMETRIC_KEY_TYPE
 extern long keyctl_pkey_query(key_serial_t,
 			      const char __user *,
 			      struct keyctl_pkey_query __user *);

 extern long keyctl_pkey_verify(const struct keyctl_pkey_params __user *,
 			       const char __user *,
 			       const void __user *, const void __user *);

 extern long keyctl_pkey_e_d_s(int,
 			      const struct keyctl_pkey_params __user *,
 			      const char __user *,
 			      const void __user *, void __user *);
 #else
 static inline long keyctl_pkey_query(key_serial_t id,
 				     const char __user *_info,
 				     struct keyctl_pkey_query __user *_res)
 {
 	return -EOPNOTSUPP;
 }

 static inline long keyctl_pkey_verify(const struct keyctl_pkey_params __user *params,
 				      const char __user *_info,
 				      const void __user *_in,
 				      const void __user *_in2)
 {
 	return -EOPNOTSUPP;
 }

 static inline long keyctl_pkey_e_d_s(int op,
 				     const struct keyctl_pkey_params __user *params,
 				     const char __user *_info,
 				     const void __user *_in,
 				     void __user *_out)
 {
 	return -EOPNOTSUPP;
 }
 #endif

 extern long keyctl_capabilities(unsigned char __user *_buffer, size_t buflen);

 /*
  * 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 */
	/* SPDX-License-Identifier: GPL-2.0-or-later */
	/* 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)
	*/

	#ifndef _INTERNAL_H
	#define _INTERNAL_H

	#include <linux/sched.h>
	#include <linux/wait_bit.h>
	#include <linux/cred.h>
	#include <linux/key-type.h>
	#include <linux/task_work.h>
	#include <linux/keyctl.h>
	#include <linux/refcount.h>
	#include <linux/compat.h>
	#include <linux/mm.h>
	#include <linux/vmalloc.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;
	refcount_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 void key_set_index_key(struct keyring_index_key *index_key);
	extern struct key_type key_type_lookup(const char type);
	extern void key_type_put(struct key_type *ktype);

	extern int __key_link_lock(struct key *keyring,
	const struct keyring_index_key *index_key);
	extern int __key_move_lock(struct key l_keyring, struct key u_keyring,
	const struct keyring_index_key *index_key);
	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) */
	#define KEYRING_SEARCH_RECURSE 0x0040 /* Search child keyrings also */

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

	/* Internal stuff */
	int skipped_ret;
	bool possessed;
	key_ref_t result;
	time64_t now;
	};

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

	extern key_ref_t search_cred_keyrings_rcu(struct keyring_search_context *ctx);
	extern key_ref_t search_process_keyrings_rcu(struct keyring_search_context *ctx);

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

	extern int look_up_user_keyrings(struct key , struct key );
	extern struct key get_user_session_keyring_rcu(const struct cred );
	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,
	struct key_tag *domain_tag,
	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);
	#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, time64_t limit);
	extern void keyring_restriction_gc(struct key *keyring,
	struct key_type *dead_type);
	extern void key_schedule_gc(time64_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);
	}

	extern struct key_type key_type_request_key_auth;
	extern struct key request_key_auth_new(struct key target,
	const char *op,
	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, time64_t limit)
	{
	return
	key->flags & ((1 << KEY_FLAG_DEAD) \|
	(1 << KEY_FLAG_INVALIDATED)) \|\|
	(key->expiry > 0 && key->expiry <= limit) \|\|
	key->domain_tag->removed;
	}

	/*
	* 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_move(key_serial_t, key_serial_t, key_serial_t, unsigned int);
	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);
	extern long keyctl_restrict_keyring(key_serial_t id,
	const char __user *_type,
	const char __user *_restriction);
	#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, struct keyctl_kdf_params __user *);
	extern long __keyctl_dh_compute(struct keyctl_dh_params __user , char __user ,
	size_t, struct keyctl_kdf_params *);
	#ifdef CONFIG_KEYS_COMPAT
	extern long compat_keyctl_dh_compute(struct keyctl_dh_params __user *params,
	char __user *buffer, size_t buflen,
	struct compat_keyctl_kdf_params __user *kdf);
	#endif
	#define KEYCTL_KDF_MAX_OUTPUT_LEN 1024 /* max length of KDF output */
	#define KEYCTL_KDF_MAX_OI_LEN 64 /* max length of otherinfo */
	#else
	static inline long keyctl_dh_compute(struct keyctl_dh_params __user *params,
	char __user *buffer, size_t buflen,
	struct keyctl_kdf_params __user *kdf)
	{
	return -EOPNOTSUPP;
	}

	#ifdef CONFIG_KEYS_COMPAT
	static inline long compat_keyctl_dh_compute(
	struct keyctl_dh_params __user *params,
	char __user *buffer, size_t buflen,
	struct keyctl_kdf_params __user *kdf)
	{
	return -EOPNOTSUPP;
	}
	#endif
	#endif

	#ifdef CONFIG_ASYMMETRIC_KEY_TYPE
	extern long keyctl_pkey_query(key_serial_t,
	const char __user *,
	struct keyctl_pkey_query __user *);

	extern long keyctl_pkey_verify(const struct keyctl_pkey_params __user *,
	const char __user *,
	const void __user , const void __user );

	extern long keyctl_pkey_e_d_s(int,
	const struct keyctl_pkey_params __user *,
	const char __user *,
	const void __user , void __user );
	#else
	static inline long keyctl_pkey_query(key_serial_t id,
	const char __user *_info,
	struct keyctl_pkey_query __user *_res)
	{
	return -EOPNOTSUPP;
	}

	static inline long keyctl_pkey_verify(const struct keyctl_pkey_params __user *params,
	const char __user *_info,
	const void __user *_in,
	const void __user *_in2)
	{
	return -EOPNOTSUPP;
	}

	static inline long keyctl_pkey_e_d_s(int op,
	const struct keyctl_pkey_params __user *params,
	const char __user *_info,
	const void __user *_in,
	void __user *_out)
	{
	return -EOPNOTSUPP;
	}
	#endif

	extern long keyctl_capabilities(unsigned char __user *_buffer, size_t buflen);

	/*
	* 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 */