linux-kernel - Re: [PATCH] x86: Set clear flag in copy_from_user/copy_to

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Message-ID: <alpine.LFD.1.10.0807280848520.3486@nehalem.linux-foundation.org>
Date:	Mon, 28 Jul 2008 08:50:12 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Vitaly Mayatskikh <v.mayatskih@...il.com>
cc:	linux-kernel@...r.kernel.org, Andi Kleen <andi@...stfloor.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] x86: Set clear flag in copy_from_user/copy_to_user



On Mon, 28 Jul 2008, Vitaly Mayatskikh wrote:
>
> Only copy_to_user should clear the rest of uncopied area.

Copy *from* user should clear the kernel result buffer tail. Copying *to* 
user should do no such thing, and cannot do it anyway, since if we get a 
fault, it's going to be in that tail that caused a fault to begin with.

		Linus
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