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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
4 * Copyright (C) 2015 Richard Weinberger (richard@nod.at)
5 */
6
7#ifndef __UM_UACCESS_H
8#define __UM_UACCESS_H
9
10#include <asm/elf.h>
11
12#define __under_task_size(addr, size) \
13 (((unsigned long) (addr) < TASK_SIZE) && \
14 (((unsigned long) (addr) + (size)) < TASK_SIZE))
15
16#define __access_ok_vsyscall(addr, size) \
17 (((unsigned long) (addr) >= FIXADDR_USER_START) && \
18 ((unsigned long) (addr) + (size) <= FIXADDR_USER_END) && \
19 ((unsigned long) (addr) + (size) >= (unsigned long)(addr)))
20
21#define __addr_range_nowrap(addr, size) \
22 ((unsigned long) (addr) <= ((unsigned long) (addr) + (size)))
23
24extern unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n);
25extern unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n);
26extern unsigned long __clear_user(void __user *mem, unsigned long len);
27static inline int __access_ok(unsigned long addr, unsigned long size);
28
29/* Teach asm-generic/uaccess.h that we have C functions for these. */
30#define __access_ok __access_ok
31#define __clear_user __clear_user
32
33#define INLINE_COPY_FROM_USER
34#define INLINE_COPY_TO_USER
35
36#include <asm-generic/uaccess.h>
37
38static inline int __access_ok(unsigned long addr, unsigned long size)
39{
40 return __addr_range_nowrap(addr, size) &&
41 (__under_task_size(addr, size) ||
42 __access_ok_vsyscall(addr, size) ||
43 uaccess_kernel());
44}
45
46#endif