linux-kernel - Re: [PATCH] hrtimer: prevent overrun DoS in hrtimer

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Message-ID: <20070314100816.GA10799@elte.hu>
Date:	Wed, 14 Mar 2007 11:08:16 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Chuck Ebbert <cebbert@...hat.com>,
	Johannes Bauer <JohannesBauer@....de>,
	linux-kernel@...r.kernel.org, schwab@...e.de,
	Stable Kernel Team <stable@...nel.org>,
	Greg KH <greg@...ah.com>, Adrian Bunk <bunk@...sta.de>,
	Andrew Morton <akpm@...l.org>
Subject: Re: [PATCH] hrtimer: prevent overrun DoS in hrtimer_forward()


* Thomas Gleixner <tglx@...utronix.de> wrote:

> hrtimer_forward() does not check for the possible overflow of 
> timer->expires. This can happen on 64 bit machines with large interval 
> values and results currently in an endless loop in the softirq because 
> the expiry value becomes negative and therefor the timer is expired 
> all the time.
> 
> Check for this condition and set the expiry value to the max. expiry 
> time in the future.
> 
> The fix should be applied to stable kernel series as well.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix,de>

ouch ... nice one.

Acked-by: Ingo Molnar <mingo@...e.hu>

	Ingo
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