oss-security - Re: CVE request - kvm: cat /dev/port in the guest can cause host DoS

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Date: Tue, 2 Feb 2010 15:56:51 -0500 (EST)
From: Josh Bressers <bressers@...hat.com>
To: oss-security@...ts.openwall.com
Cc: "Steven M. Christey" <coley@...us.mitre.org>
Subject: Re: CVE request - kvm: cat /dev/port in the guest
 can cause host DoS

----- "Eugene Teo" <eugeneteo@...nel.sg> wrote:

> The problem is pit_state->channels[] has 3 elements, and
> pit_ioport_read 
> uses "addr" as index to pit_get_count, so inb(0x43) reads (and 
> potentially writes) into other data of kvm_kpit_state.
> 
> PIT control word (address 0x43) is write-only, reads are undefined.
> 
> Triggering this can cause a general protection fault on the host.
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=560887
> http://www.mail-archive.com/kvm@vger.kernel.org/msg28002.html
> 

Please use CVE-2010-0309 for this.

Thanks.

-- 
    JB

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