blob: aa6b34cafe5f9482cc5c5e98224bde15e2ddb6d2 [file] [log] [blame]
Stephan Muellerf1c316a2016-08-19 20:39:09 +02001/* 32-bit compatibility syscall for 64-bit systems for DH operations
2 *
3 * Copyright (C) 2016 Stephan Mueller <smueller@chronox.de>
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version
8 * 2 of the License, or (at your option) any later version.
9 */
10
11#include <linux/uaccess.h>
12
13#include "internal.h"
14
15/*
16 * Perform the DH computation or DH based key derivation.
17 *
18 * If successful, 0 will be returned.
19 */
20long compat_keyctl_dh_compute(struct keyctl_dh_params __user *params,
21 char __user *buffer, size_t buflen,
22 struct compat_keyctl_kdf_params __user *kdf)
23{
24 struct keyctl_kdf_params kdfcopy;
25 struct compat_keyctl_kdf_params compat_kdfcopy;
26
27 if (!kdf)
28 return __keyctl_dh_compute(params, buffer, buflen, NULL);
29
30 if (copy_from_user(&compat_kdfcopy, kdf, sizeof(compat_kdfcopy)) != 0)
31 return -EFAULT;
32
33 kdfcopy.hashname = compat_ptr(compat_kdfcopy.hashname);
34 kdfcopy.otherinfo = compat_ptr(compat_kdfcopy.otherinfo);
35 kdfcopy.otherinfolen = compat_kdfcopy.otherinfolen;
Eric Biggers4f9dabf2017-07-13 13:16:56 +010036 memcpy(kdfcopy.__spare, compat_kdfcopy.__spare,
37 sizeof(kdfcopy.__spare));
Stephan Muellerf1c316a2016-08-19 20:39:09 +020038
39 return __keyctl_dh_compute(params, buffer, buflen, &kdfcopy);
40}