1/*
 2 * Copyright (C) 2013 Richard Weinberger <richrd@nod.at>
 3 *
 4 * This program is free software; you can redistribute it and/or modify
 5 * it under the terms of the GNU General Public License version 2 as
 6 * published by the Free Software Foundation.
 7 */
 8
 9#include <linux/uaccess.h>
10#include <linux/kernel.h>
11#include <os.h>
12
13long probe_kernel_read(void *dst, const void *src, size_t size)
14{
15	void *psrc = (void *)rounddown((unsigned long)src, PAGE_SIZE);
16
17	if ((unsigned long)src < PAGE_SIZE || size <= 0)
18		return -EFAULT;
19
20	if (os_mincore(psrc, size + src - psrc) <= 0)
21		return -EFAULT;
22
23	return __probe_kernel_read(dst, src, size);
24}