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Linux/arch/um/kernel/maccess.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * Copyright (C) 2013 Richard Weinberger <richrd@nod.at>
  4  */
  5 
  6 #include <linux/uaccess.h>
  7 #include <linux/kernel.h>
  8 #include <os.h>
  9 
 10 long probe_kernel_read(void *dst, const void *src, size_t size)
 11 {
 12         void *psrc = (void *)rounddown((unsigned long)src, PAGE_SIZE);
 13 
 14         if ((unsigned long)src < PAGE_SIZE || size <= 0)
 15                 return -EFAULT;
 16 
 17         if (os_mincore(psrc, size + src - psrc) <= 0)
 18                 return -EFAULT;
 19 
 20         return __probe_kernel_read(dst, src, size);
 21 }
 22 

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