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linux/arch/um/kernel/maccess.c
Christoph Hellwig fe557319aa maccess: rename probe_kernel_{read,write} to copy_{from,to}_kernel_nofault
Better describe what these functions do.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-06-17 10:57:41 -07:00

20 lines
456 B
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2013 Richard Weinberger <richrd@nod.at>
*/
#include <linux/uaccess.h>
#include <linux/kernel.h>
#include <os.h>
bool copy_from_kernel_nofault_allowed(const void *src, size_t size)
{
void *psrc = (void *)rounddown((unsigned long)src, PAGE_SIZE);
if ((unsigned long)src < PAGE_SIZE || size <= 0)
return false;
if (os_mincore(psrc, size + src - psrc) <= 0)
return false;
return true;
}