cregit-Linux how code gets into the kernel

Release 4.12 include/keys/user-type.h

Directory: include/keys
/* user-type.h: User-defined key type
 * Copyright (C) 2005 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (
 * 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.



#include <linux/key.h>
#include <linux/rcupdate.h>


 * the payload for a key of type "user" or "logon"
 * - once filled in and attached to a key:
 *   - the payload struct is invariant may not be changed, only replaced
 *   - the payload must be read with RCU procedures or with the key semaphore
 *     held
 *   - the payload may only be replaced with the key semaphore write-locked
 * - the key's data length is the size of the actual data, not including the
 *   payload wrapper

struct user_key_payload {
struct rcu_head	rcu;		/* RCU destructor */
unsigned short	datalen;	/* length of this data */
char		data[0];	/* actual data */

extern struct key_type key_type_user;
extern struct key_type key_type_logon;

struct key_preparsed_payload;

extern int user_preparse(struct key_preparsed_payload *prep);
extern void user_free_preparse(struct key_preparsed_payload *prep);
extern int user_update(struct key *key, struct key_preparsed_payload *prep);
extern void user_revoke(struct key *key);
extern void user_destroy(struct key *key);
extern void user_describe(const struct key *user, struct seq_file *m);
extern long user_read(const struct key *key,
		      char __user *buffer, size_t buflen);

static inline const struct user_key_payload *user_key_payload_rcu(const struct key *key) { return (struct user_key_payload *)dereference_key_rcu(key); }


David Howells27100.00%2100.00%

static inline struct user_key_payload *user_key_payload_locked(const struct key *key) { return (struct user_key_payload *)dereference_key_locked((struct key *)key); }


David Howells31100.00%2100.00%

#endif /* CONFIG_KEYS */ #endif /* _KEYS_USER_TYPE_H */

Overall Contributors

David Howells20197.10%685.71%
Jeff Layton62.90%114.29%
Directory: include/keys
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