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Date: Wed, 21 Dec 2011 23:12:10 +0100
From: Petr Matousek <pmatouse@...hat.com>
To: oss-security@...ts.openwall.com
Subject: kernel: kvm: pit timer with no irqchip crashes the system
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
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