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f1c316a3 SM |
1 | /* 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 | */ | |
20 | long 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; | |
4f9dabfa EB |
36 | memcpy(kdfcopy.__spare, compat_kdfcopy.__spare, |
37 | sizeof(kdfcopy.__spare)); | |
f1c316a3 SM |
38 | |
39 | return __keyctl_dh_compute(params, buffer, buflen, &kdfcopy); | |
40 | } |