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4f9dabfaf8
Syscalls must validate that their reserved arguments are zero and return EINVAL otherwise. Otherwise, it will be impossible to actually use them for anything in the future because existing programs may be passing garbage in. This is standard practice when adding new APIs. Cc: stable@vger.kernel.org Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: James Morris <james.l.morris@oracle.com>
41 lines
1.3 KiB
C
41 lines
1.3 KiB
C
/* 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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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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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