linux-kernel - Re: How is Code in do_sys_settimeofday() safe in case of SMP and Nest Kernel Path?

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Message-ID: <20061003080352.GA4078@ucw.cz>
Date:	Tue, 3 Oct 2006 08:03:53 +0000
From:	Pavel Machek <pavel@...e.cz>
To:	Andi Kleen <ak@...e.de>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	Dong Feng <middle.fengdong@...il.com>,
	Christoph Lameter <clameter@....com>,
	Arjan van de Ven <arjan@...radead.org>,
	Paul Mackerras <paulus@...ba.org>,
	David Howells <dhowells@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: How is Code in do_sys_settimeofday() safe in case of SMP and Nest Kernel Path?

On Sat 30-09-06 17:03:45, Andi Kleen wrote:
> 
> > Did you get to the bottom of this yet? It looks like you're right,
> > and I suggest a seqlock might be a good option.
> 
> It basically doesn't matter because nobody changes the time zone after boot.

Attacker might; in a tight loop, to confuse time-of-day subsystem, or
maybe oops the kernel.
							Pavel

-- 
Thanks for all the (sleeping) penguins.
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