Date: Wed, 21 Dec 2011 15:20:14 -0700 From: Kurt Seifried <kseifried@...hat.com> To: oss-security@...ts.openwall.com Subject: Re: kernel: kvm: pit timer with no irqchip crashes the system On 12/21/2011 03:14 PM, Petr Matousek wrote: > 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 Please use CVE-2011-4622 for this issue. -- -Kurt Seifried / Red Hat Security Response Team
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