linux/security/keys/compat_dh.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/* 32-bit compatibility syscall for 64-bit systems for DH operations
   3 *
   4 * Copyright (C) 2016 Stephan Mueller <smueller@chronox.de>
   5 */
   6
   7#include <linux/uaccess.h>
   8
   9#include "internal.h"
  10
  11/*
  12 * Perform the DH computation or DH based key derivation.
  13 *
  14 * If successful, 0 will be returned.
  15 */
  16long compat_keyctl_dh_compute(struct keyctl_dh_params __user *params,
  17                              char __user *buffer, size_t buflen,
  18                              struct compat_keyctl_kdf_params __user *kdf)
  19{
  20        struct keyctl_kdf_params kdfcopy;
  21        struct compat_keyctl_kdf_params compat_kdfcopy;
  22
  23        if (!kdf)
  24                return __keyctl_dh_compute(params, buffer, buflen, NULL);
  25
  26        if (copy_from_user(&compat_kdfcopy, kdf, sizeof(compat_kdfcopy)) != 0)
  27                return -EFAULT;
  28
  29        kdfcopy.hashname = compat_ptr(compat_kdfcopy.hashname);
  30        kdfcopy.otherinfo = compat_ptr(compat_kdfcopy.otherinfo);
  31        kdfcopy.otherinfolen = compat_kdfcopy.otherinfolen;
  32        memcpy(kdfcopy.__spare, compat_kdfcopy.__spare,
  33               sizeof(kdfcopy.__spare));
  34
  35        return __keyctl_dh_compute(params, buffer, buflen, &kdfcopy);
  36}
  37