From: Ingo Molnar <mingo@elte.hu>
To: Avi Kivity <avi@qumranet.com>
Cc: Andi Kleen <andi@firstfloor.org>, Andrew Morton <akpm@osdl.org>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Make LIST_POISON less deadly
Date: Tue, 20 May 2008 14:04:31 +0200 [thread overview]
Message-ID: <20080520120431.GA9461@elte.hu> (raw)
In-Reply-To: <4832BB6A.8010809@qumranet.com>
* Avi Kivity <avi@qumranet.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
next prev parent reply other threads:[~2008-05-20 12:05 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-18 15:38 [PATCH] Make LIST_POISON less deadly Avi Kivity
2008-05-19 13:01 ` Ingo Molnar
2008-05-19 13:18 ` Avi Kivity
2008-05-19 13:22 ` Ingo Molnar
2008-05-19 13:35 ` Avi Kivity
2008-05-19 13:45 ` Avi Kivity
2008-05-19 19:04 ` Sam Ravnborg
2008-05-20 7:06 ` Avi Kivity
2008-05-20 11:24 ` Andi Kleen
2008-05-20 11:34 ` Avi Kivity
2008-05-20 11:49 ` Andi Kleen
2008-05-20 11:52 ` Avi Kivity
2008-05-20 12:04 ` Andi Kleen
2008-05-20 12:04 ` Ingo Molnar [this message]
2008-05-20 16:47 ` Pavel Machek
2008-05-20 16:50 ` Avi Kivity
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