linux-stable/security/keys/compat_dh.c
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00

36 lines
1.1 KiB
C

// 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);
}