linux-kernel - Re: [-mm patch] make csum_and_copy_from_user arch independent (was Re: 2.6.21-mm2)

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Date:	Fri, 11 May 2007 01:33:17 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Frederik Deweerdt <deweerdt@...e.fr>
Cc:	linux-kernel@...r.kernel.org, jorge@...er.satlink.net,
	agulbra@....unit.no, netdev@...r.kernel.org,
	David Howells <dhowells@...hat.com>
Subject: Re: [-mm patch] make csum_and_copy_from_user arch independent (was
 Re: 2.6.21-mm2)

On Fri, 11 May 2007 10:27:38 +0200 Frederik Deweerdt <deweerdt@...e.fr> wrote:

> On Wed, May 09, 2007 at 01:23:22AM -0700, Andrew Morton wrote:
> > 
> > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.21/2.6.21-mm2/
> > 
> 
> ERROR: "csum_partial_copy_from_user" [net/rxrpc/af-rxrpc.ko] undefined!
> 
> Linking on ARM fails because albeit a generic csum_and_copy_from_user()
> function is provided in the case ! _HAVE_ARCH_COPY_AND_CSUM_FROM_USER, the
> generic function uses csum_partial_copy_from_user() which is i386 only.
> 
> The following patch uses copy_from_user() followed by csum_partial()
> to make the function platform independent.
> 
> Regards,
> Frederik
> 
> Signed-off-by: Frederik Deweerdt <frederik.deweerdt@...il.com>
> 
> diff --git a/include/net/checksum.h b/include/net/checksum.h
> index 1242461..2eebb95 100644
> --- a/include/net/checksum.h
> +++ b/include/net/checksum.h
> @@ -30,13 +30,16 @@ static inline
>  __wsum csum_and_copy_from_user (const void __user *src, void *dst,
>  				      int len, __wsum sum, int *err_ptr)
>  {
> -	if (access_ok(VERIFY_READ, src, len))
> -		return csum_partial_copy_from_user(src, dst, len, sum, err_ptr);
> +	if (access_ok(VERIFY_READ, src, len)) {
> +		if (copy_from_user(dst, src, len))
> +			return -EFAULT;
> +		return csum_partial(dst, len, sum);
> +	}
>  
>  	if (len)
>  		*err_ptr = -EFAULT;
>  
> -	return sum;
> +	return (__force __wsum)-1; /* invalid checksum */
>  }
>  #endif
>  

hm.  Please cc netdev on net patches.
-
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