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 24 extern unsigned long raw_copy_from_user(void *to, const void __user *from, unsigned long n); 25 extern unsigned long raw_copy_to_user(void __user *to, const void *from, unsigned long n); 26 extern unsigned long __clear_user(void __user *mem, unsigned long len); 27 static 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 38 static 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 47