From: Ingo Molnar <mingo@elte.hu>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Chuck Ebbert <cebbert@redhat.com>,
Johannes Bauer <JohannesBauer@gmx.de>,
linux-kernel@vger.kernel.org, schwab@suse.de,
Stable Kernel Team <stable@kernel.org>, Greg KH <greg@kroah.com>,
Adrian Bunk <bunk@stusta.de>, Andrew Morton <akpm@osdl.org>
Subject: Re: [PATCH] hrtimer: prevent overrun DoS in hrtimer_forward()
Date: Wed, 14 Mar 2007 11:08:16 +0100 [thread overview]
Message-ID: <20070314100816.GA10799@elte.hu> (raw)
In-Reply-To: <1173866413.13341.154.camel@localhost.localdomain>
* Thomas Gleixner <tglx@linutronix.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@linutronix,de>
ouch ... nice one.
Acked-by: Ingo Molnar <mingo@elte.hu>
Ingo
next prev parent reply other threads:[~2007-03-14 10:09 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-13 18:55 x86_64 system lockup from userspace using setitimer() Johannes Bauer
2007-03-13 19:19 ` Andreas Schwab
2007-03-13 20:02 ` Chuck Ebbert
2007-03-13 20:33 ` Thomas Gleixner
2007-03-14 10:00 ` [PATCH] hrtimer: prevent overrun DoS in hrtimer_forward() Thomas Gleixner
2007-03-14 10:08 ` Ingo Molnar [this message]
2007-03-16 20:43 ` Andrew Morton
2007-03-16 21:05 ` Thomas Gleixner
2007-03-18 21:16 ` Chuck Ebbert
2007-03-18 21:32 ` Thomas Gleixner
2007-03-18 21:53 ` Chuck Ebbert
2007-03-18 22:04 ` Thomas Gleixner
2007-03-18 22:02 ` Chuck Ebbert
2007-04-04 21:11 ` Adrian Bunk
2007-04-04 21:30 ` Thomas Gleixner
2007-04-09 13:01 ` Adrian Bunk
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