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

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Message-ID: <4A187BDE.5070601@redhat.com>
Date:	Sat, 23 May 2009 18:42:38 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	"Larry H." <research@...reption.com>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...l.org>, linux-mm@...ck.org,
	Ingo Molnar <mingo@...hat.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, pageexec@...email.hu
Subject: Re: [patch 0/5] Support for sanitization flag in low-level page	allocator

Ingo Molnar wrote:

> What you are missing is that your patch makes _no technical sense_ 
> if you allow the same information to leak over the kernel stack. 
> Kernel stacks can be freed and reused, swapped out and thus 
> 'exposed'.

Kernel stacks may be freed and reused, but Larry's latest
patch takes care of that by clearing them at page free
time.

As for being swapped out - I do not believe that kernel
stacks can ever be swapped out in Linux.

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