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