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

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Message-ID: <4A2223FE.3000309@cs.helsinki.fi>
Date:	Sun, 31 May 2009 09:30:22 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	"Larry H." <research@...reption.com>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Rik van Riel <riel@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	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:
> OK, I'm going to squeeze some time and provide patches that perform the
> same my original page bit ones did, but using kzfree. Behold code like
> in the tty buffer management, which uses the page allocator directly for
> allocations greater than PAGE_SIZE in length. That needs special
> treatment, and is exactly the reason I've proposed unconditional
> sanitization since the original patches were rejected.

You might want to also do the patch Alan suggested for the security 
conscious people. That is, do a memset() in every page free and wrap 
that under CONFIG_SECURITY_PARANOIA or something. There's no reason the 
kzfree() patches and that can't co-exist.

			Pekka
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