compat_dh.c (1076B)
1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 32-bit compatibility syscall for 64-bit systems for DH operations 3 * 4 * Copyright (C) 2016 Stephan Mueller <smueller@chronox.de> 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 */ 16long 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; 32 memcpy(kdfcopy.__spare, compat_kdfcopy.__spare, 33 sizeof(kdfcopy.__spare)); 34 35 return __keyctl_dh_compute(params, buffer, buflen, &kdfcopy); 36}