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Date: Wed, 21 Dec 2011 23:14:37 +0100
From: Petr Matousek <pmatouse@...hat.com>
To: oss-security@...ts.openwall.com
Subject: Re: kernel: kvm: pit timer with no irqchip crashes
the system
Sorry, I forgot to put "CVE Request" into the subject.
Petr
On Wed, Dec 21, 2011 at 11:12:10PM +0100, Petr Matousek wrote:
> User space may create the PIT and forget about setting up the irqchips.
> In that case, firing PIT IRQs will crash the host:
>
> BUG: unable to handle kernel NULL pointer dereference at
> 0000000000000128
> IP: [<ffffffffa10f6280>] kvm_set_irq+0x30/0x170 [kvm]
> ...
> Call Trace:
> [<ffffffffa11228c1>] pit_do_work+0x51/0xd0 [kvm]
> [<ffffffff81071431>] process_one_work+0x111/0x4d0
> [<ffffffff81071bb2>] worker_thread+0x152/0x340
> [<ffffffff81075c8e>] kthread+0x7e/0x90
> [<ffffffff815a4474>] kernel_thread_helper+0x4/0x10
>
> Reference:
> http://permalink.gmane.org/gmane.comp.emulators.kvm.devel/83564
> https://bugzilla.redhat.com/show_bug.cgi?id=769721
>
> Thanks,
> --
> Petr Matousek / Red Hat Security Response Team
--
Petr Matousek / Red Hat Security Response Team
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