cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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maccess.c (456B)

      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
     10bool copy_from_kernel_nofault_allowed(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 false;
     16	if (os_mincore(psrc, size + src - psrc) <= 0)
     17		return false;
     18	return true;
     19}