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