cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

user-type.h (1959B)

      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2/* user-type.h: User-defined key type
      3 *
      4 * Copyright (C) 2005 Red Hat, Inc. All Rights Reserved.
      5 * Written by David Howells (dhowells@redhat.com)
      6 */
      7
      8#ifndef _KEYS_USER_TYPE_H
      9#define _KEYS_USER_TYPE_H
     10
     11#include <linux/key.h>
     12#include <linux/rcupdate.h>
     13
     14#ifdef CONFIG_KEYS
     15
     16/*****************************************************************************/
     17/*
     18 * the payload for a key of type "user" or "logon"
     19 * - once filled in and attached to a key:
     20 *   - the payload struct is invariant may not be changed, only replaced
     21 *   - the payload must be read with RCU procedures or with the key semaphore
     22 *     held
     23 *   - the payload may only be replaced with the key semaphore write-locked
     24 * - the key's data length is the size of the actual data, not including the
     25 *   payload wrapper
     26 */
     27struct user_key_payload {
     28	struct rcu_head	rcu;		/* RCU destructor */
     29	unsigned short	datalen;	/* length of this data */
     30	char		data[] __aligned(__alignof__(u64)); /* actual data */
     31};
     32
     33extern struct key_type key_type_user;
     34extern struct key_type key_type_logon;
     35
     36struct key_preparsed_payload;
     37
     38extern int user_preparse(struct key_preparsed_payload *prep);
     39extern void user_free_preparse(struct key_preparsed_payload *prep);
     40extern int user_update(struct key *key, struct key_preparsed_payload *prep);
     41extern void user_revoke(struct key *key);
     42extern void user_destroy(struct key *key);
     43extern void user_describe(const struct key *user, struct seq_file *m);
     44extern long user_read(const struct key *key, char *buffer, size_t buflen);
     45
     46static inline const struct user_key_payload *user_key_payload_rcu(const struct key *key)
     47{
     48	return (struct user_key_payload *)dereference_key_rcu(key);
     49}
     50
     51static inline struct user_key_payload *user_key_payload_locked(const struct key *key)
     52{
     53	return (struct user_key_payload *)dereference_key_locked((struct key *)key);
     54}
     55
     56#endif /* CONFIG_KEYS */
     57
     58#endif /* _KEYS_USER_TYPE_H */