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

[Josh Bressers <bressers () redhat com>]

----- "Eugene Teo" <eugeneteo () kernel 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