uaccess.h File Reference

#include <linux/thread_info.h>
#include <linux/errno.h>
#include <asm/processor.h>
#include <asm/elf.h>

Go to the source code of this file.

Data Structures
struct	mm_segment_t
struct	exception_table_entry

Macros
#define	VERIFY_READ   0
#define	VERIFY_WRITE   1
#define	MAKE_MM_SEG(s)   ((mm_segment_t) { (s) })
#define	KERNEL_DS   MAKE_MM_SEG(0xFFFFFFFF)
#define	USER_DS   MAKE_MM_SEG(TASK_SIZE)
#define	get_ds()   (KERNEL_DS)
#define	get_fs()   (current_thread_info()->addr_limit)
#define	set_fs(x)   (current_thread_info()->addr_limit = (x))
#define	segment_eq(a, b)   ((a).seg == (b).seg)
#define	__under_task_size(addr, size)
#define	__access_ok_vsyscall(type, addr, size)
#define	__addr_range_nowrap(addr, size)   ((unsigned long) (addr) <= ((unsigned long) (addr) + (size)))
#define	access_ok(type, addr, size)
#define	__copy_from_user(to, from, n)   copy_from_user(to, from, n)
#define	__copy_to_user(to, from, n)   copy_to_user(to, from, n)
#define	__copy_to_user_inatomic   __copy_to_user
#define	__copy_from_user_inatomic   __copy_from_user
#define	__get_user(x, ptr)
#define	get_user(x, ptr)
#define	__put_user(x, ptr)
#define	put_user(x, ptr)
#define	strlen_user(str)   strnlen_user(str, ~0U >> 1)

Functions
int	copy_from_user (void *to, const void __user *from, int n)
int	copy_to_user (void __user *to, const void *from, int n)
int	strncpy_from_user (char *dst, const char __user *src, int count)
int	__clear_user (void __user *mem, int len)
int	clear_user (void __user *mem, int len)
int	strnlen_user (const void __user *str, int len)

Macro Definition Documentation

#define __access_ok_vsyscall	(		type,
			addr,
			size
	)

Value:

((type == VERIFY_READ) && \
      ((unsigned long) (addr) >= FIXADDR_USER_START) && \
      ((unsigned long) (addr) + (size) <= FIXADDR_USER_END) && \
      ((unsigned long) (addr) + (size) >= (unsigned long)(addr)))

Definition at line 45 of file uaccess.h.

#define __addr_range_nowrap	(		addr,
			size
	)		((unsigned long) (addr) <= ((unsigned long) (addr) + (size)))

Definition at line 51 of file uaccess.h.

#define __copy_from_user	(		to,
			from,
			n
	)		copy_from_user(to, from, n)

Definition at line 122 of file uaccess.h.

#define __copy_from_user_inatomic   __copy_from_user

Definition at line 127 of file uaccess.h.

#define __copy_to_user	(		to,
			from,
			n
	)		copy_to_user(to, from, n)

Definition at line 124 of file uaccess.h.

#define __copy_to_user_inatomic   __copy_to_user

Definition at line 126 of file uaccess.h.

#define __get_user	(		x,
			ptr
	)

Value:

({ \
    const __typeof__(*(ptr)) __user *__private_ptr = (ptr); \
    __typeof__(x) __private_val;            \
    int __private_ret = -EFAULT;            \
    (x) = (__typeof__(*(__private_ptr)))0;              \
    if (__copy_from_user((__force void *)&__private_val, (__private_ptr),\
                 sizeof(*(__private_ptr))) == 0) {      \
        (x) = (__typeof__(*(__private_ptr))) __private_val; \
        __private_ret = 0;                  \
    }                               \
    __private_ret;                          \
})

Definition at line 129 of file uaccess.h.

#define __put_user	(		x,
			ptr
	)

Value:

({ \
        __typeof__(*(ptr)) __user *__private_ptr = ptr; \
        __typeof__(*(__private_ptr)) __private_val; \
        int __private_ret = -EFAULT; \
        __private_val = (__typeof__(*(__private_ptr))) (x); \
        if (__copy_to_user((__private_ptr), &__private_val, \
               sizeof(*(__private_ptr))) == 0) { \
        __private_ret = 0; \
    } \
        __private_ret; \
})

Definition at line 150 of file uaccess.h.

#define __under_task_size	(		addr,
			size
	)

Value:

(((unsigned long) (addr) < TASK_SIZE) && \
     (((unsigned long) (addr) + (size)) < TASK_SIZE))

Definition at line 41 of file uaccess.h.

#define access_ok	(		type,
			addr,
			size
	)

Value:

(__addr_range_nowrap(addr, size) && \
     (__under_task_size(addr, size) || \
      __access_ok_vsyscall(type, addr, size) || \
      segment_eq(get_fs(), KERNEL_DS)))

Definition at line 54 of file uaccess.h.

#define get_ds

(

void

)

(KERNEL_DS)

Definition at line 35 of file uaccess.h.

#define get_fs

(

void

)

(current_thread_info()->addr_limit)

Definition at line 36 of file uaccess.h.

#define get_user	(		x,
			ptr
	)

Value:

({ \
        const __typeof__((*(ptr))) __user *private_ptr = (ptr); \
        (access_ok(VERIFY_READ, private_ptr, sizeof(*private_ptr)) ? \
     __get_user(x, private_ptr) : ((x) = (__typeof__(*ptr))0, -EFAULT)); \
})

Definition at line 143 of file uaccess.h.

#define KERNEL_DS   MAKE_MM_SEG(0xFFFFFFFF)

Definition at line 32 of file uaccess.h.

#define MAKE_MM_SEG

(

s

)

((mm_segment_t) { (s) })

Definition at line 30 of file uaccess.h.

#define put_user	(		x,
			ptr
	)

Value:

({ \
        __typeof__(*(ptr)) __user *private_ptr = (ptr); \
        (access_ok(VERIFY_WRITE, private_ptr, sizeof(*private_ptr)) ? \
     __put_user(x, private_ptr) : -EFAULT); \
})

Definition at line 163 of file uaccess.h.

#define segment_eq	(		a,
			b
	)		((a).seg == (b).seg)

Definition at line 39 of file uaccess.h.

#define set_fs

(

x

)

(current_thread_info()->addr_limit = (x))

Definition at line 37 of file uaccess.h.

#define strlen_user

(

str

)

strnlen_user(str, ~0U >> 1)

Definition at line 170 of file uaccess.h.

#define USER_DS   MAKE_MM_SEG(TASK_SIZE)

Definition at line 33 of file uaccess.h.

#define VERIFY_READ   0

Definition at line 19 of file uaccess.h.

#define VERIFY_WRITE   1

Definition at line 20 of file uaccess.h.

Function Documentation

int __clear_user	(	void __user *	mem,
		int	len
	)

Definition at line 218 of file uaccess.c.

int clear_user	(	void __user *	mem,
		int	len
	)

Definition at line 223 of file uaccess.c.

int copy_from_user	(	void *	to,
		const void __user *	from,
		int	n
	)

Definition at line 142 of file uaccess.c.

int copy_to_user	(	void __user *	to,
		const void *	from,
		int	n
	)

Definition at line 164 of file uaccess.c.

int strncpy_from_user	(	char *	dst,
		const char __user *	src,
		int	count
	)

Definition at line 191 of file uaccess.c.

int strnlen_user	(	const void __user *	str,
		int	len
	)

Definition at line 247 of file uaccess.c.