| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) |
| * Copyright (C) 2015 Richard Weinberger (richard@nod.at) |
| */ |
| |
| #ifndef __UM_UACCESS_H |
| #define __UM_UACCESS_H |
| |
| #include <asm/elf.h> |
| |
| #define __under_task_size(addr, size) \ |
| (((unsigned long) (addr) < TASK_SIZE) && \ |
| (((unsigned long) (addr) + (size)) < TASK_SIZE)) |
| |
| #define __access_ok_vsyscall(addr, size) \ |
| (((unsigned long) (addr) >= FIXADDR_USER_START) && \ |
| ((unsigned long) (addr) + (size) <= FIXADDR_USER_END) && \ |
| ((unsigned long) (addr) + (size) >= (unsigned long)(addr))) |
| |
| #define __addr_range_nowrap(addr, size) \ |
| ((unsigned long) (addr) <= ((unsigned long) (addr) + (size))) |
| |
| extern unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n); |
| extern unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n); |
| extern long __strncpy_from_user(char *dst, const char __user *src, long count); |
| extern long __strnlen_user(const void __user *str, long len); |
| extern unsigned long __clear_user(void __user *mem, unsigned long len); |
| static inline int __access_ok(unsigned long addr, unsigned long size); |
| |
| /* Teach asm-generic/uaccess.h that we have C functions for these. */ |
| #define __access_ok __access_ok |
| #define __clear_user __clear_user |
| #define __strnlen_user __strnlen_user |
| #define __strncpy_from_user __strncpy_from_user |
| #define INLINE_COPY_FROM_USER |
| #define INLINE_COPY_TO_USER |
| |
| #include <asm-generic/uaccess.h> |
| |
| static inline int __access_ok(unsigned long addr, unsigned long size) |
| { |
| return __addr_range_nowrap(addr, size) && |
| (__under_task_size(addr, size) || |
| __access_ok_vsyscall(addr, size) || |
| uaccess_kernel()); |
| } |
| |
| #endif |