diff options
Diffstat (limited to 'include/keys/user-type.h')
-rw-r--r-- | include/keys/user-type.h | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/include/keys/user-type.h b/include/keys/user-type.h new file mode 100644 index 000000000..386c31432 --- /dev/null +++ b/include/keys/user-type.h @@ -0,0 +1,58 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* user-type.h: User-defined key type + * + * Copyright (C) 2005 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + */ + +#ifndef _KEYS_USER_TYPE_H +#define _KEYS_USER_TYPE_H + +#include <linux/key.h> +#include <linux/rcupdate.h> + +#ifdef CONFIG_KEYS + +/*****************************************************************************/ +/* + * 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[] __aligned(__alignof__(u64)); /* 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 *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); +} + +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); +} + +#endif /* CONFIG_KEYS */ + +#endif /* _KEYS_USER_TYPE_H */ |