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get rid of padding, switch to RAW_COPY_USER

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Merced is fucked, so what else is new?

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2017-04-05 18:56:55 -04:00
parent 652c1aaca2
commit b3622d3217
3 changed files with 6 additions and 43 deletions
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1
arch/ia64/Kconfig
View File

@ -53,6 +53,7 @@ config IA64
select ARCH_USE_CMPXCHG_LOCKREF
select HAVE_ARCH_AUDITSYSCALL
select HAVE_ARCH_HARDENED_USERCOPY
select ARCH_HAS_RAW_COPY_USER
default y
help
The Itanium Processor Family is Intel's 64-bit successor to

35
arch/ia64/include/asm/uaccess.h
View File

@ -235,46 +235,19 @@ extern unsigned long __must_check __copy_user (void __user *to, const void __use
unsigned long count);
static inline unsigned long
__copy_to_user (void __user *to, const void *from, unsigned long count)
raw_copy_to_user(void __user *to, const void *from, unsigned long count)
{
check_object_size(from, count, true);
return __copy_user(to, (__force void __user *) from, count);
}
static inline unsigned long
__copy_from_user (void *to, const void __user *from, unsigned long count)
raw_copy_from_user(void *to, const void __user *from, unsigned long count)
{
check_object_size(to, count, false);
return __copy_user((__force void __user *) to, from, count);
}
#define __copy_to_user_inatomic __copy_to_user
#define __copy_from_user_inatomic __copy_from_user
#define copy_to_user(to, from, n) \
({ \
void __user *__cu_to = (to); \
const void *__cu_from = (from); \
long __cu_len = (n); \
\
if (__access_ok(__cu_to, __cu_len)) { \
check_object_size(__cu_from, __cu_len, true); \
__cu_len = __copy_user(__cu_to, (__force void __user *) __cu_from, __cu_len); \
} \
__cu_len; \
})
static inline unsigned long
copy_from_user(void *to, const void __user *from, unsigned long n)
{
check_object_size(to, n, false);
if (likely(__access_ok(from, n)))
n = __copy_user((__force void __user *) to, from, n);
else
memset(to, 0, n);
return n;
}
#define INLINE_COPY_FROM_USER
#define INLINE_COPY_TO_USER
extern unsigned long __do_clear_user (void __user *, unsigned long);

13
arch/ia64/lib/memcpy_mck.S
View File

@ -556,9 +556,6 @@ EK(.ex_handler, (p17) st8 [dst1]=r39,8); \
#define D r22
#define F r28
#define memset_arg0 r32
#define memset_arg2 r33
#define saved_retval loc0
#define saved_rtlink loc1
#define saved_pfs_stack loc2
@ -622,7 +619,7 @@ EK(.ex_handler, (p17) st8 [dst1]=r39,8); \
* (faulting_addr - orig_dst) -> len to faulting st address
* B = (cur_dst - orig_dst) -> len copied so far
* C = A - B -> len need to be copied
* D = orig_len - A -> len need to be zeroed
* D = orig_len - A -> len need to be left along
*/
(p6) sub A = F, saved_in0
(p7) sub A = F, saved_in1
@ -638,9 +635,6 @@ EK(.ex_handler, (p17) st8 [dst1]=r39,8); \
sub D = saved_in2, A
;;
cmp.gt p8,p0=C,r0 // more than 1 byte?
add memset_arg0=saved_in0, A
(p6) mov memset_arg2=0 // copy_to_user should not call memset
(p7) mov memset_arg2=D // copy_from_user need to have kbuf zeroed
mov r8=0
mov saved_retval = D
mov saved_rtlink = b0
@ -652,11 +646,6 @@ EK(.ex_handler, (p17) st8 [dst1]=r39,8); \
;;
add saved_retval=saved_retval,r8 // above might return non-zero value
cmp.gt p8,p0=memset_arg2,r0 // more than 1 byte?
mov out0=memset_arg0 // *s
mov out1=r0 // c
mov out2=memset_arg2 // n
(p8) br.call.sptk.few b0=memset
;;
mov retval=saved_retval