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/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 long __strncpy_from_user(char *dst, const char __user *src, long count); 27 extern long __strnlen_user(const void __user *str, long len); 28 extern unsigned long __clear_user(void __user *mem, unsigned long len); 29 static inline int __access_ok(unsigned long addr, unsigned long size); 30 31 /* Teach asm-generic/uaccess.h that we have C functions for these. */ 32 #define __access_ok __access_ok 33 #define __clear_user __clear_user 34 #define __strnlen_user __strnlen_user 35 #define __strncpy_from_user __strncpy_from_user 36 #define INLINE_COPY_FROM_USER 37 #define INLINE_COPY_TO_USER 38 39 #include <asm-generic/uaccess.h> 40 41 static inline int __access_ok(unsigned long addr, unsigned long size) 42 { 43 return __addr_range_nowrap(addr, size) && 44 (__under_task_size(addr, size) || 45 __access_ok_vsyscall(addr, size) || 46 uaccess_kernel()); 47 } 48 49 #endif 50