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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
f1c316a3 SM |
2 | /* 32-bit compatibility syscall for 64-bit systems for DH operations |
3 | * | |
4 | * Copyright (C) 2016 Stephan Mueller <smueller@chronox.de> | |
f1c316a3 SM |
5 | */ |
6 | ||
7 | #include <linux/uaccess.h> | |
8 | ||
9 | #include "internal.h" | |
10 | ||
11 | /* | |
12 | * Perform the DH computation or DH based key derivation. | |
13 | * | |
14 | * If successful, 0 will be returned. | |
15 | */ | |
16 | long compat_keyctl_dh_compute(struct keyctl_dh_params __user *params, | |
17 | char __user *buffer, size_t buflen, | |
18 | struct compat_keyctl_kdf_params __user *kdf) | |
19 | { | |
20 | struct keyctl_kdf_params kdfcopy; | |
21 | struct compat_keyctl_kdf_params compat_kdfcopy; | |
22 | ||
23 | if (!kdf) | |
24 | return __keyctl_dh_compute(params, buffer, buflen, NULL); | |
25 | ||
26 | if (copy_from_user(&compat_kdfcopy, kdf, sizeof(compat_kdfcopy)) != 0) | |
27 | return -EFAULT; | |
28 | ||
29 | kdfcopy.hashname = compat_ptr(compat_kdfcopy.hashname); | |
30 | kdfcopy.otherinfo = compat_ptr(compat_kdfcopy.otherinfo); | |
31 | kdfcopy.otherinfolen = compat_kdfcopy.otherinfolen; | |
4f9dabfa EB |
32 | memcpy(kdfcopy.__spare, compat_kdfcopy.__spare, |
33 | sizeof(kdfcopy.__spare)); | |
f1c316a3 SM |
34 | |
35 | return __keyctl_dh_compute(params, buffer, buflen, &kdfcopy); | |
36 | } |