linux-kernel - Re: [PATCH] filldir write data missing size

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Date:	Mon, 28 Jul 2008 14:58:16 -0400
From:	Yoshinori Sato <ysato@...rs.sourceforge.jp>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] filldir write data missing size

At Tue, 22 Jul 2008 06:31:12 +0900,
OGAWA Hirofumi wrote:
> 
> Yoshinori Sato <ysato@...rs.sourceforge.jp> writes:
> 
> > This problem is sh-linux-gcc v4.1.2 and target sh2(a)-bigendian.
> >
> > "__put_user(s64, u32_ptr)" compiled.
> >
> > Correct code.
> > *u32_ptr = s64 & 0xffffffff;
> >
> > Bad code.
> > *u32_ptr = s64 >> 32;
> >
> > I'm add cast put_user 4byte case.
> 
> I see. How about the following patch? I guess the problems of this type
> should be fixed.
> 
> diff -puN include/asm-sh/uaccess_32.h~sh-fix include/asm-sh/uaccess_32.h
> --- linux-2.6/include/asm-sh/uaccess_32.h~sh-fix	2008-07-22 06:20:15.000000000 +0900
> +++ linux-2.6-hirofumi/include/asm-sh/uaccess_32.h	2008-07-22 06:25:26.000000000 +0900
> @@ -211,8 +211,9 @@ do {							\
>  ({								\
>  	long __pu_err;						\
>  	__typeof__(*(ptr)) __user *__pu_addr = (ptr);		\
> +	__typeof__(*(ptr)) __pu_val = x;			\
>  	__chk_user_ptr(ptr);					\
> -	__put_user_size((x), __pu_addr, (size), __pu_err);	\
> +	__put_user_size(__pu_val, __pu_addr, (size), __pu_err);	\
>  	__pu_err;						\
>  })
>  
> @@ -220,8 +221,9 @@ do {							\
>  ({								\
>  	long __pu_err = -EFAULT;				\
>  	__typeof__(*(ptr)) __user *__pu_addr = (ptr);		\
> +	__typeof__(*(ptr)) __pu_val = x;			\
>  	if (likely(access_ok(VERIFY_WRITE, __pu_addr, size)))	\
> -		__put_user_size((x), __pu_addr, (size),		\
> +		__put_user_size(__pu_val, __pu_addr, (size),	\
>  				__pu_err);			\
>  	__pu_err;						\
>  })
> _
> -- 
> OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>

Sorry too late reply.

This fix is good. 
But I send other workaround fix.

Thanks.

-- 
Yoshinori Sato
<ysato@...rs.sourceforge.jp>
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