mirror of https://gitee.com/openkylin/linux.git
25 lines
638 B
C
25 lines
638 B
C
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/*
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* Copyright (C) 2013 Richard Weinberger <richrd@nod.at>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/uaccess.h>
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#include <linux/kernel.h>
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#include <os.h>
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long probe_kernel_read(void *dst, const void *src, size_t size)
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{
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void *psrc = (void *)rounddown((unsigned long)src, PAGE_SIZE);
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if ((unsigned long)src < PAGE_SIZE || size <= 0)
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return -EFAULT;
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if (os_mincore(psrc, size + src - psrc) <= 0)
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return -EFAULT;
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return __probe_kernel_read(dst, src, size);
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}
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