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 } 41