tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
3 * Copyright (C) 2015 Richard Weinberger (richard@nod.at)
4 * Licensed under the GPL
5 */
6
7#ifndef __UM_UACCESS_H
8#define __UM_UACCESS_H
9
10#include <asm/thread_info.h>
11#include <asm/elf.h>
12
13#define __under_task_size(addr, size) \
14 (((unsigned long) (addr) < TASK_SIZE) && \
15 (((unsigned long) (addr) + (size)) < TASK_SIZE))
16
17#define __access_ok_vsyscall(addr, size) \
18 (((unsigned long) (addr) >= FIXADDR_USER_START) && \
19 ((unsigned long) (addr) + (size) <= FIXADDR_USER_END) && \
20 ((unsigned long) (addr) + (size) >= (unsigned long)(addr)))
21
22#define __addr_range_nowrap(addr, size) \
23 ((unsigned long) (addr) <= ((unsigned long) (addr) + (size)))
24
25extern long __copy_from_user(void *to, const void __user *from, unsigned long n);
26extern long __copy_to_user(void __user *to, const void *from, unsigned long n);
27extern long __strncpy_from_user(char *dst, const char __user *src, long count);
28extern long __strnlen_user(const void __user *str, long len);
29extern unsigned long __clear_user(void __user *mem, unsigned long len);
30static inline int __access_ok(unsigned long addr, unsigned long size);
31
32/* Teach asm-generic/uaccess.h that we have C functions for these. */
33#define __access_ok __access_ok
34#define __clear_user __clear_user
35#define __copy_to_user __copy_to_user
36#define __copy_from_user __copy_from_user
37#define __strnlen_user __strnlen_user
38#define __strncpy_from_user __strncpy_from_user
39#define __copy_to_user_inatomic __copy_to_user
40#define __copy_from_user_inatomic __copy_from_user
41
42#include <asm-generic/uaccess.h>
43
44static inline int __access_ok(unsigned long addr, unsigned long size)
45{
46 return __addr_range_nowrap(addr, size) &&
47 (__under_task_size(addr, size) ||
48 __access_ok_vsyscall(addr, size) ||
49 segment_eq(get_fs(), KERNEL_DS));
50}
51
52#endif