// SPDX-License-Identifier: GPL-2.0-or-later /* 32-bit compatibility syscall for 64-bit systems for DH operations * * Copyright (C) 2016 Stephan Mueller <smueller@chronox.de> */ #include <linux/uaccess.h> #include "internal.h" /* * Perform the DH computation or DH based key derivation. * * If successful, 0 will be returned. */ long compat_keyctl_dh_compute(struct keyctl_dh_params __user *params, char __user *buffer, size_t buflen, struct compat_keyctl_kdf_params __user *kdf) { struct keyctl_kdf_params kdfcopy; struct compat_keyctl_kdf_params compat_kdfcopy; if (!kdf) return __keyctl_dh_compute(params, buffer, buflen, NULL); if (copy_from_user(&compat_kdfcopy, kdf, sizeof(compat_kdfcopy)) != 0) return -EFAULT; kdfcopy.hashname = compat_ptr(compat_kdfcopy.hashname); kdfcopy.otherinfo = compat_ptr(compat_kdfcopy.otherinfo); kdfcopy.otherinfolen = compat_kdfcopy.otherinfolen; memcpy(kdfcopy.__spare, compat_kdfcopy.__spare, sizeof(kdfcopy.__spare)); return __keyctl_dh_compute(params, buffer, buflen, &kdfcopy); }