forked from Minki/linux
97de50c0ad
Remove the deprecated (and unused) verify_area() from various uaccess.h headers. Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
394 lines
11 KiB
C
394 lines
11 KiB
C
#ifdef __KERNEL__
|
|
#ifndef _PPC_UACCESS_H
|
|
#define _PPC_UACCESS_H
|
|
|
|
#ifndef __ASSEMBLY__
|
|
#include <linux/sched.h>
|
|
#include <linux/errno.h>
|
|
#include <asm/processor.h>
|
|
|
|
#define VERIFY_READ 0
|
|
#define VERIFY_WRITE 1
|
|
|
|
/*
|
|
* The fs value determines whether argument validity checking should be
|
|
* performed or not. If get_fs() == USER_DS, checking is performed, with
|
|
* get_fs() == KERNEL_DS, checking is bypassed.
|
|
*
|
|
* For historical reasons, these macros are grossly misnamed.
|
|
*
|
|
* The fs/ds values are now the highest legal address in the "segment".
|
|
* This simplifies the checking in the routines below.
|
|
*/
|
|
|
|
#define KERNEL_DS ((mm_segment_t) { ~0UL })
|
|
#define USER_DS ((mm_segment_t) { TASK_SIZE - 1 })
|
|
|
|
#define get_ds() (KERNEL_DS)
|
|
#define get_fs() (current->thread.fs)
|
|
#define set_fs(val) (current->thread.fs = (val))
|
|
|
|
#define segment_eq(a,b) ((a).seg == (b).seg)
|
|
|
|
#define __access_ok(addr,size) \
|
|
((addr) <= current->thread.fs.seg \
|
|
&& ((size) == 0 || (size) - 1 <= current->thread.fs.seg - (addr)))
|
|
|
|
#define access_ok(type, addr, size) \
|
|
(__chk_user_ptr(addr),__access_ok((unsigned long)(addr),(size)))
|
|
|
|
/*
|
|
* The exception table consists of pairs of addresses: the first is the
|
|
* address of an instruction that is allowed to fault, and the second is
|
|
* the address at which the program should continue. No registers are
|
|
* modified, so it is entirely up to the continuation code to figure out
|
|
* what to do.
|
|
*
|
|
* All the routines below use bits of fixup code that are out of line
|
|
* with the main instruction path. This means when everything is well,
|
|
* we don't even have to jump over them. Further, they do not intrude
|
|
* on our cache or tlb entries.
|
|
*/
|
|
|
|
struct exception_table_entry
|
|
{
|
|
unsigned long insn, fixup;
|
|
};
|
|
|
|
/*
|
|
* These are the main single-value transfer routines. They automatically
|
|
* use the right size if we just have the right pointer type.
|
|
*
|
|
* This gets kind of ugly. We want to return _two_ values in "get_user()"
|
|
* and yet we don't want to do any pointers, because that is too much
|
|
* of a performance impact. Thus we have a few rather ugly macros here,
|
|
* and hide all the ugliness from the user.
|
|
*
|
|
* The "__xxx" versions of the user access functions are versions that
|
|
* do not verify the address space, that must have been done previously
|
|
* with a separate "access_ok()" call (this is used when we do multiple
|
|
* accesses to the same area of user memory).
|
|
*
|
|
* As we use the same address space for kernel and user data on the
|
|
* PowerPC, we can just do these as direct assignments. (Of course, the
|
|
* exception handling means that it's no longer "just"...)
|
|
*
|
|
* The "user64" versions of the user access functions are versions that
|
|
* allow access of 64-bit data. The "get_user" functions do not
|
|
* properly handle 64-bit data because the value gets down cast to a long.
|
|
* The "put_user" functions already handle 64-bit data properly but we add
|
|
* "user64" versions for completeness
|
|
*/
|
|
#define get_user(x,ptr) \
|
|
__get_user_check((x),(ptr),sizeof(*(ptr)))
|
|
#define get_user64(x,ptr) \
|
|
__get_user64_check((x),(ptr),sizeof(*(ptr)))
|
|
#define put_user(x,ptr) \
|
|
__put_user_check((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
|
|
#define put_user64(x,ptr) put_user(x,ptr)
|
|
|
|
#define __get_user(x,ptr) \
|
|
__get_user_nocheck((x),(ptr),sizeof(*(ptr)))
|
|
#define __get_user64(x,ptr) \
|
|
__get_user64_nocheck((x),(ptr),sizeof(*(ptr)))
|
|
#define __put_user(x,ptr) \
|
|
__put_user_nocheck((__typeof__(*(ptr)))(x),(ptr),sizeof(*(ptr)))
|
|
#define __put_user64(x,ptr) __put_user(x,ptr)
|
|
|
|
extern long __put_user_bad(void);
|
|
|
|
#define __put_user_nocheck(x,ptr,size) \
|
|
({ \
|
|
long __pu_err; \
|
|
__chk_user_ptr(ptr); \
|
|
__put_user_size((x),(ptr),(size),__pu_err); \
|
|
__pu_err; \
|
|
})
|
|
|
|
#define __put_user_check(x,ptr,size) \
|
|
({ \
|
|
long __pu_err = -EFAULT; \
|
|
__typeof__(*(ptr)) __user *__pu_addr = (ptr); \
|
|
if (access_ok(VERIFY_WRITE,__pu_addr,size)) \
|
|
__put_user_size((x),__pu_addr,(size),__pu_err); \
|
|
__pu_err; \
|
|
})
|
|
|
|
#define __put_user_size(x,ptr,size,retval) \
|
|
do { \
|
|
retval = 0; \
|
|
switch (size) { \
|
|
case 1: \
|
|
__put_user_asm(x, ptr, retval, "stb"); \
|
|
break; \
|
|
case 2: \
|
|
__put_user_asm(x, ptr, retval, "sth"); \
|
|
break; \
|
|
case 4: \
|
|
__put_user_asm(x, ptr, retval, "stw"); \
|
|
break; \
|
|
case 8: \
|
|
__put_user_asm2(x, ptr, retval); \
|
|
break; \
|
|
default: \
|
|
__put_user_bad(); \
|
|
} \
|
|
} while (0)
|
|
|
|
/*
|
|
* We don't tell gcc that we are accessing memory, but this is OK
|
|
* because we do not write to any memory gcc knows about, so there
|
|
* are no aliasing issues.
|
|
*/
|
|
#define __put_user_asm(x, addr, err, op) \
|
|
__asm__ __volatile__( \
|
|
"1: "op" %1,0(%2)\n" \
|
|
"2:\n" \
|
|
".section .fixup,\"ax\"\n" \
|
|
"3: li %0,%3\n" \
|
|
" b 2b\n" \
|
|
".previous\n" \
|
|
".section __ex_table,\"a\"\n" \
|
|
" .align 2\n" \
|
|
" .long 1b,3b\n" \
|
|
".previous" \
|
|
: "=r" (err) \
|
|
: "r" (x), "b" (addr), "i" (-EFAULT), "0" (err))
|
|
|
|
#define __put_user_asm2(x, addr, err) \
|
|
__asm__ __volatile__( \
|
|
"1: stw %1,0(%2)\n" \
|
|
"2: stw %1+1,4(%2)\n" \
|
|
"3:\n" \
|
|
".section .fixup,\"ax\"\n" \
|
|
"4: li %0,%3\n" \
|
|
" b 3b\n" \
|
|
".previous\n" \
|
|
".section __ex_table,\"a\"\n" \
|
|
" .align 2\n" \
|
|
" .long 1b,4b\n" \
|
|
" .long 2b,4b\n" \
|
|
".previous" \
|
|
: "=r" (err) \
|
|
: "r" (x), "b" (addr), "i" (-EFAULT), "0" (err))
|
|
|
|
#define __get_user_nocheck(x, ptr, size) \
|
|
({ \
|
|
long __gu_err; \
|
|
unsigned long __gu_val; \
|
|
__chk_user_ptr(ptr); \
|
|
__get_user_size(__gu_val, (ptr), (size), __gu_err); \
|
|
(x) = (__typeof__(*(ptr)))__gu_val; \
|
|
__gu_err; \
|
|
})
|
|
|
|
#define __get_user64_nocheck(x, ptr, size) \
|
|
({ \
|
|
long __gu_err; \
|
|
long long __gu_val; \
|
|
__chk_user_ptr(ptr); \
|
|
__get_user_size64(__gu_val, (ptr), (size), __gu_err); \
|
|
(x) = (__typeof__(*(ptr)))__gu_val; \
|
|
__gu_err; \
|
|
})
|
|
|
|
#define __get_user_check(x, ptr, size) \
|
|
({ \
|
|
long __gu_err = -EFAULT; \
|
|
unsigned long __gu_val = 0; \
|
|
const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
|
|
if (access_ok(VERIFY_READ, __gu_addr, (size))) \
|
|
__get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
|
|
(x) = (__typeof__(*(ptr)))__gu_val; \
|
|
__gu_err; \
|
|
})
|
|
|
|
#define __get_user64_check(x, ptr, size) \
|
|
({ \
|
|
long __gu_err = -EFAULT; \
|
|
long long __gu_val = 0; \
|
|
const __typeof__(*(ptr)) __user *__gu_addr = (ptr); \
|
|
if (access_ok(VERIFY_READ, __gu_addr, (size))) \
|
|
__get_user_size64(__gu_val, __gu_addr, (size), __gu_err); \
|
|
(x) = (__typeof__(*(ptr)))__gu_val; \
|
|
__gu_err; \
|
|
})
|
|
|
|
extern long __get_user_bad(void);
|
|
|
|
#define __get_user_size(x, ptr, size, retval) \
|
|
do { \
|
|
retval = 0; \
|
|
switch (size) { \
|
|
case 1: \
|
|
__get_user_asm(x, ptr, retval, "lbz"); \
|
|
break; \
|
|
case 2: \
|
|
__get_user_asm(x, ptr, retval, "lhz"); \
|
|
break; \
|
|
case 4: \
|
|
__get_user_asm(x, ptr, retval, "lwz"); \
|
|
break; \
|
|
default: \
|
|
x = __get_user_bad(); \
|
|
} \
|
|
} while (0)
|
|
|
|
#define __get_user_size64(x, ptr, size, retval) \
|
|
do { \
|
|
retval = 0; \
|
|
switch (size) { \
|
|
case 1: \
|
|
__get_user_asm(x, ptr, retval, "lbz"); \
|
|
break; \
|
|
case 2: \
|
|
__get_user_asm(x, ptr, retval, "lhz"); \
|
|
break; \
|
|
case 4: \
|
|
__get_user_asm(x, ptr, retval, "lwz"); \
|
|
break; \
|
|
case 8: \
|
|
__get_user_asm2(x, ptr, retval); \
|
|
break; \
|
|
default: \
|
|
x = __get_user_bad(); \
|
|
} \
|
|
} while (0)
|
|
|
|
#define __get_user_asm(x, addr, err, op) \
|
|
__asm__ __volatile__( \
|
|
"1: "op" %1,0(%2)\n" \
|
|
"2:\n" \
|
|
".section .fixup,\"ax\"\n" \
|
|
"3: li %0,%3\n" \
|
|
" li %1,0\n" \
|
|
" b 2b\n" \
|
|
".previous\n" \
|
|
".section __ex_table,\"a\"\n" \
|
|
" .align 2\n" \
|
|
" .long 1b,3b\n" \
|
|
".previous" \
|
|
: "=r"(err), "=r"(x) \
|
|
: "b"(addr), "i"(-EFAULT), "0"(err))
|
|
|
|
#define __get_user_asm2(x, addr, err) \
|
|
__asm__ __volatile__( \
|
|
"1: lwz %1,0(%2)\n" \
|
|
"2: lwz %1+1,4(%2)\n" \
|
|
"3:\n" \
|
|
".section .fixup,\"ax\"\n" \
|
|
"4: li %0,%3\n" \
|
|
" li %1,0\n" \
|
|
" li %1+1,0\n" \
|
|
" b 3b\n" \
|
|
".previous\n" \
|
|
".section __ex_table,\"a\"\n" \
|
|
" .align 2\n" \
|
|
" .long 1b,4b\n" \
|
|
" .long 2b,4b\n" \
|
|
".previous" \
|
|
: "=r"(err), "=&r"(x) \
|
|
: "b"(addr), "i"(-EFAULT), "0"(err))
|
|
|
|
/* more complex routines */
|
|
|
|
extern int __copy_tofrom_user(void __user *to, const void __user *from,
|
|
unsigned long size);
|
|
|
|
extern inline unsigned long
|
|
copy_from_user(void *to, const void __user *from, unsigned long n)
|
|
{
|
|
unsigned long over;
|
|
|
|
if (access_ok(VERIFY_READ, from, n))
|
|
return __copy_tofrom_user((__force void __user *)to, from, n);
|
|
if ((unsigned long)from < TASK_SIZE) {
|
|
over = (unsigned long)from + n - TASK_SIZE;
|
|
return __copy_tofrom_user((__force void __user *)to, from, n - over) + over;
|
|
}
|
|
return n;
|
|
}
|
|
|
|
extern inline unsigned long
|
|
copy_to_user(void __user *to, const void *from, unsigned long n)
|
|
{
|
|
unsigned long over;
|
|
|
|
if (access_ok(VERIFY_WRITE, to, n))
|
|
return __copy_tofrom_user(to, (__force void __user *) from, n);
|
|
if ((unsigned long)to < TASK_SIZE) {
|
|
over = (unsigned long)to + n - TASK_SIZE;
|
|
return __copy_tofrom_user(to, (__force void __user *) from, n - over) + over;
|
|
}
|
|
return n;
|
|
}
|
|
|
|
static inline unsigned long __copy_from_user(void *to, const void __user *from, unsigned long size)
|
|
{
|
|
return __copy_tofrom_user((__force void __user *)to, from, size);
|
|
}
|
|
|
|
static inline unsigned long __copy_to_user(void __user *to, const void *from, unsigned long size)
|
|
{
|
|
return __copy_tofrom_user(to, (__force void __user *)from, size);
|
|
}
|
|
|
|
#define __copy_to_user_inatomic __copy_to_user
|
|
#define __copy_from_user_inatomic __copy_from_user
|
|
|
|
extern unsigned long __clear_user(void __user *addr, unsigned long size);
|
|
|
|
extern inline unsigned long
|
|
clear_user(void __user *addr, unsigned long size)
|
|
{
|
|
if (access_ok(VERIFY_WRITE, addr, size))
|
|
return __clear_user(addr, size);
|
|
if ((unsigned long)addr < TASK_SIZE) {
|
|
unsigned long over = (unsigned long)addr + size - TASK_SIZE;
|
|
return __clear_user(addr, size - over) + over;
|
|
}
|
|
return size;
|
|
}
|
|
|
|
extern int __strncpy_from_user(char *dst, const char __user *src, long count);
|
|
|
|
extern inline long
|
|
strncpy_from_user(char *dst, const char __user *src, long count)
|
|
{
|
|
if (access_ok(VERIFY_READ, src, 1))
|
|
return __strncpy_from_user(dst, src, count);
|
|
return -EFAULT;
|
|
}
|
|
|
|
/*
|
|
* Return the size of a string (including the ending 0)
|
|
*
|
|
* Return 0 for error
|
|
*/
|
|
|
|
extern int __strnlen_user(const char __user *str, long len, unsigned long top);
|
|
|
|
/*
|
|
* Returns the length of the string at str (including the null byte),
|
|
* or 0 if we hit a page we can't access,
|
|
* or something > len if we didn't find a null byte.
|
|
*
|
|
* The `top' parameter to __strnlen_user is to make sure that
|
|
* we can never overflow from the user area into kernel space.
|
|
*/
|
|
extern __inline__ int strnlen_user(const char __user *str, long len)
|
|
{
|
|
unsigned long top = current->thread.fs.seg;
|
|
|
|
if ((unsigned long)str > top)
|
|
return 0;
|
|
return __strnlen_user(str, len, top);
|
|
}
|
|
|
|
#define strlen_user(str) strnlen_user((str), 0x7ffffffe)
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
|
|
#endif /* _PPC_UACCESS_H */
|
|
#endif /* __KERNEL__ */
|