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KEYS: Implement a big key type that can save to tmpfs

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Implement a big key type that can save its contents to tmpfs and thus
swapspace when memory is tight.  This is useful for Kerberos ticket caches.

Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Simo Sorce <simo@redhat.com>
This commit is contained in:
David Howells
2013-09-24 10:35:18 +01:00
parent b2a4df200d
commit ab3c3587f8
5 changed files with 242 additions and 0 deletions
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include/keys/big_key-type.h
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/* Big capacity key type.
*
* Copyright (C) 2013 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 _KEYS_BIG_KEY_TYPE_H
#define _KEYS_BIG_KEY_TYPE_H
#include <linux/key-type.h>
extern struct key_type key_type_big_key;
extern int big_key_instantiate(struct key *key, struct key_preparsed_payload *prep);
extern void big_key_revoke(struct key *key);
extern void big_key_destroy(struct key *key);
extern void big_key_describe(const struct key *big_key, struct seq_file *m);
extern long big_key_read(const struct key *key, char __user *buffer, size_t buflen);
#endif /* _KEYS_BIG_KEY_TYPE_H */