162306a36Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0-or-later 262306a36Sopenharmony_ci/* 32-bit compatibility syscall for 64-bit systems for DH operations 362306a36Sopenharmony_ci * 462306a36Sopenharmony_ci * Copyright (C) 2016 Stephan Mueller <smueller@chronox.de> 562306a36Sopenharmony_ci */ 662306a36Sopenharmony_ci 762306a36Sopenharmony_ci#include <linux/uaccess.h> 862306a36Sopenharmony_ci 962306a36Sopenharmony_ci#include "internal.h" 1062306a36Sopenharmony_ci 1162306a36Sopenharmony_ci/* 1262306a36Sopenharmony_ci * Perform the DH computation or DH based key derivation. 1362306a36Sopenharmony_ci * 1462306a36Sopenharmony_ci * If successful, 0 will be returned. 1562306a36Sopenharmony_ci */ 1662306a36Sopenharmony_cilong compat_keyctl_dh_compute(struct keyctl_dh_params __user *params, 1762306a36Sopenharmony_ci char __user *buffer, size_t buflen, 1862306a36Sopenharmony_ci struct compat_keyctl_kdf_params __user *kdf) 1962306a36Sopenharmony_ci{ 2062306a36Sopenharmony_ci struct keyctl_kdf_params kdfcopy; 2162306a36Sopenharmony_ci struct compat_keyctl_kdf_params compat_kdfcopy; 2262306a36Sopenharmony_ci 2362306a36Sopenharmony_ci if (!kdf) 2462306a36Sopenharmony_ci return __keyctl_dh_compute(params, buffer, buflen, NULL); 2562306a36Sopenharmony_ci 2662306a36Sopenharmony_ci if (copy_from_user(&compat_kdfcopy, kdf, sizeof(compat_kdfcopy)) != 0) 2762306a36Sopenharmony_ci return -EFAULT; 2862306a36Sopenharmony_ci 2962306a36Sopenharmony_ci kdfcopy.hashname = compat_ptr(compat_kdfcopy.hashname); 3062306a36Sopenharmony_ci kdfcopy.otherinfo = compat_ptr(compat_kdfcopy.otherinfo); 3162306a36Sopenharmony_ci kdfcopy.otherinfolen = compat_kdfcopy.otherinfolen; 3262306a36Sopenharmony_ci memcpy(kdfcopy.__spare, compat_kdfcopy.__spare, 3362306a36Sopenharmony_ci sizeof(kdfcopy.__spare)); 3462306a36Sopenharmony_ci 3562306a36Sopenharmony_ci return __keyctl_dh_compute(params, buffer, buflen, &kdfcopy); 3662306a36Sopenharmony_ci} 37