The patch titled
h8300: fix recent uaccess breakage
has been added to the -mm tree. Its filename is
h8300-fix-recent-uaccess-breakage.patch
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------------------------------------------------------
Subject: h8300: fix recent uaccess breakage
From: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
Al Viro wrote:
>
> After that commit in asm-h8300/uaccess.h we have
>
> #define get_user(x, ptr) \
> ({ \
> int __gu_err = 0; \
> uint32_t __gu_val = 0; \
> ^^^^^^^^^^^^^^^^^
> switch (sizeof(*(ptr))) { \
> case 1: \
> case 2: \
> case 4: \
> __gu_val = *(ptr); \
> break; \
> case 8: \
> memcpy(&__gu_val, ptr, sizeof (*(ptr))); \
> ^^^^^^^^^^^^^^^^
>
> which, of course, is FUBAR whenever we actually hit that case - memcpy of
> 8 bytes into uint32_t is obviously wrong. Why don't we simply do
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/asm-h8300/uaccess.h | 11 ++++-------
1 file changed, 4 insertions(+), 7 deletions(-)
diff -puN include/asm-h8300/uaccess.h~h8300-fix-recent-uaccess-breakage include/asm-h8300/uaccess.h
--- a/include/asm-h8300/uaccess.h~h8300-fix-recent-uaccess-breakage
+++ a/include/asm-h8300/uaccess.h
@@ -91,22 +91,19 @@ extern int __put_user_bad(void);
#define get_user(x, ptr) \
({ \
int __gu_err = 0; \
- uint32_t __gu_val = 0; \
+ typeof(*(ptr)) __gu_val = *ptr; \
switch (sizeof(*(ptr))) { \
case 1: \
case 2: \
case 4: \
- __gu_val = *(ptr); \
- break; \
- case 8: \
- memcpy(&__gu_val, ptr, sizeof (*(ptr))); \
+ case 8: \
break; \
default: \
- __gu_val = 0; \
__gu_err = __get_user_bad(); \
+ __gu_val = 0; \
break; \
} \
- (x) = (typeof(*(ptr)))__gu_val; \
+ (x) = __gu_val; \
__gu_err; \
})
#define __get_user(x, ptr) get_user(x, ptr)
_
Patches currently in -mm which might be from ysato@xxxxxxxxxxxxxxxxxxxx are
elf-use-elf_core_eflags-for-kcore-elf-header-flags.patch
h8300-fix-recent-uaccess-breakage.patch
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