linux-kernel - Re: [patch 5/5] Apply the PG_sensitive flag to the CryptoAPI subsystem

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Message-ID: <20090531113404.5051114d@lxorguk.ukuu.org.uk>
Date:	Sun, 31 May 2009 11:34:04 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	pageexec@...email.hu
Cc:	"Larry H." <research@...reption.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>,
	linux-crypto@...r.kernel.org,
	Pekka Enberg <penberg@...helsinki.fi>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [patch 5/5] Apply the PG_sensitive flag to the CryptoAPI
 subsystem

> > Also, there's no discussion about long-lived threads keeping 
> > sensitive information in there kernel stack indefinitely.
> 
> kernel stack clearing isn't hard to do, just do it on every syscall exit
> and in the infinite loop for kernel threads.

Actually that is probably not as important. In most cases you would be
leaking data between syscalls made by the same thread. 

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