linux-kernel - Re: strict copy_from

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Message-ID: <4B47C984.1080903@zytor.com>
Date:	Fri, 08 Jan 2010 16:10:44 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Arjan van de Ven <arjan@...radead.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	David Miller <davem@...emloft.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: strict copy_from_user checks issues?

On 01/08/2010 04:07 PM, Arnd Bergmann wrote:
> 
> Also, the calling conventions require you to write slightly more when
> you want to pass down an error value, e.g.
> 
> 	return copy_to_user(uptr, &data, sizeof(data)) ? -EFAULT : 0;
> 
> instead of
> 
> 	return put_user(data, uptr);
> 
> The latter form requires a macro instead of a function for the user copy,
> but we now have that anyway because of the size check.
> 

Well... we already have the latter form?

	-hpa

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