| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 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; |
| 36 | memcpy(kdfcopy.__spare, compat_kdfcopy.__spare, |
| 37 | sizeof(kdfcopy.__spare)); |
| 38 | |
| 39 | return __keyctl_dh_compute(params, buffer, buflen, &kdfcopy); |
| 40 | } |