File: maccess.c

package info (click to toggle)
linux 5.10.46-4
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 1,191,996 kB
  • sloc: ansic: 19,502,768; asm: 263,759; sh: 73,960; makefile: 44,724; perl: 34,644; python: 32,387; cpp: 6,070; yacc: 4,755; lex: 2,742; awk: 1,214; ruby: 25; sed: 5
file content (19 lines) | stat: -rw-r--r-- 456 bytes parent folder | download | duplicates (10) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
 
// 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;
}