18c2ecf20Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0-or-later 28c2ecf20Sopenharmony_ci/* 32-bit compatibility syscall for 64-bit systems for DH operations 38c2ecf20Sopenharmony_ci * 48c2ecf20Sopenharmony_ci * Copyright (C) 2016 Stephan Mueller <smueller@chronox.de> 58c2ecf20Sopenharmony_ci */ 68c2ecf20Sopenharmony_ci 78c2ecf20Sopenharmony_ci#include <linux/uaccess.h> 88c2ecf20Sopenharmony_ci 98c2ecf20Sopenharmony_ci#include "internal.h" 108c2ecf20Sopenharmony_ci 118c2ecf20Sopenharmony_ci/* 128c2ecf20Sopenharmony_ci * Perform the DH computation or DH based key derivation. 138c2ecf20Sopenharmony_ci * 148c2ecf20Sopenharmony_ci * If successful, 0 will be returned. 158c2ecf20Sopenharmony_ci */ 168c2ecf20Sopenharmony_cilong compat_keyctl_dh_compute(struct keyctl_dh_params __user *params, 178c2ecf20Sopenharmony_ci char __user *buffer, size_t buflen, 188c2ecf20Sopenharmony_ci struct compat_keyctl_kdf_params __user *kdf) 198c2ecf20Sopenharmony_ci{ 208c2ecf20Sopenharmony_ci struct keyctl_kdf_params kdfcopy; 218c2ecf20Sopenharmony_ci struct compat_keyctl_kdf_params compat_kdfcopy; 228c2ecf20Sopenharmony_ci 238c2ecf20Sopenharmony_ci if (!kdf) 248c2ecf20Sopenharmony_ci return __keyctl_dh_compute(params, buffer, buflen, NULL); 258c2ecf20Sopenharmony_ci 268c2ecf20Sopenharmony_ci if (copy_from_user(&compat_kdfcopy, kdf, sizeof(compat_kdfcopy)) != 0) 278c2ecf20Sopenharmony_ci return -EFAULT; 288c2ecf20Sopenharmony_ci 298c2ecf20Sopenharmony_ci kdfcopy.hashname = compat_ptr(compat_kdfcopy.hashname); 308c2ecf20Sopenharmony_ci kdfcopy.otherinfo = compat_ptr(compat_kdfcopy.otherinfo); 318c2ecf20Sopenharmony_ci kdfcopy.otherinfolen = compat_kdfcopy.otherinfolen; 328c2ecf20Sopenharmony_ci memcpy(kdfcopy.__spare, compat_kdfcopy.__spare, 338c2ecf20Sopenharmony_ci sizeof(kdfcopy.__spare)); 348c2ecf20Sopenharmony_ci 358c2ecf20Sopenharmony_ci return __keyctl_dh_compute(params, buffer, buflen, &kdfcopy); 368c2ecf20Sopenharmony_ci} 37