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Kirill Smelkov
linux
Commits
7c35666d
Commit
7c35666d
authored
Jul 18, 2003
by
Paul Mackerras
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PPC32: Change mm_segment_t definitions to simplify the code.
parent
a55f8631
Changes
1
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1 changed file
with
12 additions
and
8 deletions
+12
-8
include/asm-ppc/uaccess.h
include/asm-ppc/uaccess.h
+12
-8
No files found.
include/asm-ppc/uaccess.h
View file @
7c35666d
...
...
@@ -16,10 +16,13 @@
* 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) {
0
})
#define USER_DS ((mm_segment_t) { 1 })
#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)
...
...
@@ -27,14 +30,15 @@
#define segment_eq(a,b) ((a).seg == (b).seg)
#define __kernel_ok (segment_eq(get_fs(), KERNEL_DS))
#define __user_ok(addr,size) (((size) <= TASK_SIZE)&&((addr) <= TASK_SIZE-(size)))
#define __access_ok(addr,size) (__kernel_ok || __user_ok((addr),(size)))
#define access_ok(type,addr,size) __access_ok((unsigned long)(addr),(size))
#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) __access_ok((unsigned long)(addr),(size))
extern
inline
int
verify_area
(
int
type
,
const
void
__user
*
addr
,
unsigned
long
size
)
{
return
access_ok
(
type
,
addr
,
size
)
?
0
:
-
EFAULT
;
return
access_ok
(
type
,
addr
,
size
)
?
0
:
-
EFAULT
;
}
...
...
@@ -303,7 +307,7 @@ extern int __strnlen_user(const char __user *str, long len, unsigned long top);
*/
extern
__inline__
int
strnlen_user
(
const
char
__user
*
str
,
long
len
)
{
unsigned
long
top
=
__kernel_ok
?
~
0UL
:
TASK_SIZE
-
1
;
unsigned
long
top
=
current
->
thread
.
fs
.
seg
;
if
((
unsigned
long
)
str
>
top
)
return
0
;
...
...
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