linux-kernel - Re: [PATCH] Make LIST

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Message-ID: <20080520120431.GA9461@elte.hu>
Date:	Tue, 20 May 2008 14:04:31 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Avi Kivity <avi@...ranet.com>
Cc:	Andi Kleen <andi@...stfloor.org>, Andrew Morton <akpm@...l.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Make LIST_POISON less deadly

* Avi Kivity <avi@...ranet.com> wrote:

> I guess a fixmap would work for this.  But then the offsets added to 
> that page would need to be limited to 4K.

i dont think it's worth going for 32-bit here. On 32-bit the poison 
value gets skewed into hard to recognize values which might make oops 
analysis harder. Lets start small with 64-bit-only - there it's a quite 
plausible change, besides the exponentially larger address space on 
64-bit it might realistically happen that an attacker can control a 
32-bit-is offset but not a full 64-bit offset.

	Ingo
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