linux-kernel - Re: strict copy_from

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Message-ID: <4B48EDA6.4050608@zytor.com>
Date:	Sat, 09 Jan 2010 12:57:10 -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 01/09/2010 12:01 AM, Arnd Bergmann wrote:
> On Saturday 09 January 2010, H. Peter Anvin wrote:
>>>       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?
> 
> Right, but my suggestion was to extend that do data structures in
> addition to the scalars we are supporting now.
> 
> 	Arnd

Structures, as in "struct"?  That would seem to be a good idea.  Arrays,
which can be dynamically sized, are trickier.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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