1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
4*4882a593Smuzhiyun * Copyright (C) 2015 Richard Weinberger (richard@nod.at)
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #ifndef __UM_UACCESS_H
8*4882a593Smuzhiyun #define __UM_UACCESS_H
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <asm/elf.h>
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun #define __under_task_size(addr, size) \
13*4882a593Smuzhiyun (((unsigned long) (addr) < TASK_SIZE) && \
14*4882a593Smuzhiyun (((unsigned long) (addr) + (size)) < TASK_SIZE))
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun #define __access_ok_vsyscall(addr, size) \
17*4882a593Smuzhiyun (((unsigned long) (addr) >= FIXADDR_USER_START) && \
18*4882a593Smuzhiyun ((unsigned long) (addr) + (size) <= FIXADDR_USER_END) && \
19*4882a593Smuzhiyun ((unsigned long) (addr) + (size) >= (unsigned long)(addr)))
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun #define __addr_range_nowrap(addr, size) \
22*4882a593Smuzhiyun ((unsigned long) (addr) <= ((unsigned long) (addr) + (size)))
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun extern unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n);
25*4882a593Smuzhiyun extern unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n);
26*4882a593Smuzhiyun extern long __strncpy_from_user(char *dst, const char __user *src, long count);
27*4882a593Smuzhiyun extern long __strnlen_user(const void __user *str, long len);
28*4882a593Smuzhiyun extern unsigned long __clear_user(void __user *mem, unsigned long len);
29*4882a593Smuzhiyun static inline int __access_ok(unsigned long addr, unsigned long size);
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun /* Teach asm-generic/uaccess.h that we have C functions for these. */
32*4882a593Smuzhiyun #define __access_ok __access_ok
33*4882a593Smuzhiyun #define __clear_user __clear_user
34*4882a593Smuzhiyun #define __strnlen_user __strnlen_user
35*4882a593Smuzhiyun #define __strncpy_from_user __strncpy_from_user
36*4882a593Smuzhiyun #define INLINE_COPY_FROM_USER
37*4882a593Smuzhiyun #define INLINE_COPY_TO_USER
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun #include <asm-generic/uaccess.h>
40*4882a593Smuzhiyun
__access_ok(unsigned long addr,unsigned long size)41*4882a593Smuzhiyun static inline int __access_ok(unsigned long addr, unsigned long size)
42*4882a593Smuzhiyun {
43*4882a593Smuzhiyun return __addr_range_nowrap(addr, size) &&
44*4882a593Smuzhiyun (__under_task_size(addr, size) ||
45*4882a593Smuzhiyun __access_ok_vsyscall(addr, size) ||
46*4882a593Smuzhiyun uaccess_kernel());
47*4882a593Smuzhiyun }
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun #endif
50