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8569c9140b
We can't just plop asm/* into it - userland helpers are built with it in search path and seeing asm/* show up there suddenly would be a bad idea. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
98 lines
3.0 KiB
C
98 lines
3.0 KiB
C
/*
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* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Licensed under the GPL
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*/
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#ifndef __ARCH_UM_UACCESS_H
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#define __ARCH_UM_UACCESS_H
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#include <asm/elf.h>
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#include <asm/fixmap.h>
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#include "sysdep/archsetjmp.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(type, addr, size) \
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((type == VERIFY_READ) && \
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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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#define access_ok(type, addr, size) \
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(__addr_range_nowrap(addr, size) && \
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(__under_task_size(addr, size) || \
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__access_ok_vsyscall(type, addr, size) || \
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segment_eq(get_fs(), KERNEL_DS)))
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extern int copy_from_user(void *to, const void __user *from, int n);
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extern int copy_to_user(void __user *to, const void *from, int n);
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extern int __do_copy_to_user(void *to, const void *from, int n,
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void **fault_addr, jmp_buf **fault_catcher);
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/*
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* strncpy_from_user: - Copy a NUL terminated string from userspace.
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* @dst: Destination address, in kernel space. This buffer must be at
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* least @count bytes long.
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* @src: Source address, in user space.
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* @count: Maximum number of bytes to copy, including the trailing NUL.
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*
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* Copies a NUL-terminated string from userspace to kernel space.
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*
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* On success, returns the length of the string (not including the trailing
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* NUL).
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*
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* If access to userspace fails, returns -EFAULT (some data may have been
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* copied).
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*
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* If @count is smaller than the length of the string, copies @count bytes
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* and returns @count.
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*/
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extern int strncpy_from_user(char *dst, const char __user *src, int count);
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/*
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* __clear_user: - Zero a block of memory in user space, with less checking.
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* @to: Destination address, in user space.
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* @n: Number of bytes to zero.
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*
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* Zero a block of memory in user space. Caller must check
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* the specified block with access_ok() before calling this function.
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*
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* Returns number of bytes that could not be cleared.
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* On success, this will be zero.
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*/
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extern int __clear_user(void __user *mem, int len);
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/*
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* clear_user: - Zero a block of memory in user space.
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* @to: Destination address, in user space.
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* @n: Number of bytes to zero.
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*
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* Zero a block of memory in user space.
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*
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* Returns number of bytes that could not be cleared.
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* On success, this will be zero.
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*/
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extern int clear_user(void __user *mem, int len);
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/*
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* strlen_user: - Get the size of a string in user space.
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* @str: The string to measure.
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* @n: The maximum valid length
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*
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* Get the size of a NUL-terminated string in user space.
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*
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* Returns the size of the string INCLUDING the terminating NUL.
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* On exception, returns 0.
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* If the string is too long, returns a value greater than @n.
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*/
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extern int strnlen_user(const void __user *str, int len);
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#endif
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