mirror of https://gitee.com/openkylin/linux.git
49 lines
982 B
C
49 lines
982 B
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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*
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* Copyright (C) IBM Corporation, 2010
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*
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* Author: Anton Blanchard <anton@au.ibm.com>
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*/
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#include <linux/export.h>
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#include <linux/compiler.h>
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#include <linux/types.h>
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#include <asm/checksum.h>
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#include <linux/uaccess.h>
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__wsum csum_and_copy_from_user(const void __user *src, void *dst,
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int len)
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{
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__wsum csum;
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might_sleep();
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if (unlikely(!access_ok(src, len)))
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return 0;
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allow_read_from_user(src, len);
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csum = csum_partial_copy_generic((void __force *)src, dst, len);
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prevent_read_from_user(src, len);
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return csum;
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}
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EXPORT_SYMBOL(csum_and_copy_from_user);
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__wsum csum_and_copy_to_user(const void *src, void __user *dst, int len)
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{
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__wsum csum;
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might_sleep();
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if (unlikely(!access_ok(dst, len)))
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return 0;
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allow_write_to_user(dst, len);
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csum = csum_partial_copy_generic(src, (void __force *)dst, len);
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prevent_write_to_user(dst, len);
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return csum;
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}
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EXPORT_SYMBOL(csum_and_copy_to_user);
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