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