linux-kernel - Re: [patch 0/5] Support for sanitization flag in low-level page allocator

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Message-ID: <4A20E6CF.8070003@cs.helsinki.fi>
Date:	Sat, 30 May 2009 10:57:03 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	"Larry H." <research@...reption.com>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>, Ingo Molnar <mingo@...e.hu>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...l.org>, linux-mm@...ck.org,
	Ingo Molnar <mingo@...hat.com>, pageexec@...email.hu,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [patch 0/5] Support for sanitization flag in low-level page	allocator

Larry H. wrote:
> Furthermore, selective clearing doesn't solve the roots of the problem.
> It's just adding bandages to a wound which never stops bleeding. I
> proposed an initial page flag because we could use it later for
> unconditional page clearing doing a one line change in a header file.
> 
> I see a lot of speculation on what works and what doesn't, but
> there isn't much on the practical side of things, yet. I provided test
> results that proved some of the comments wrong, and I've referenced
> literature which shows the reasoning behind all this. What else can I do
> to make you understand you are missing the point here?

Hey, if you want to add a CONFIG_ZERO_ALL_MEMORY_PARANOIA thing that can 
be disabled, go for it! But you have to find someone else to take the 
merge the SLAB bits because, quite frankly, I am not convinced it's 
worth it. And the hand waving you're doing here isn't really helping 
your case, sorry.

			Pekka
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