Re: CVE request: kernel: KVM: x86 emulator: limit instructions to 15 bytes

[Josh Bressers <bressers () redhat com>]

Please use CVE-2009-4031 for this.

Thanks

-- 
    JB


----- "Eugene Teo" <eugeneteo () kernel sg> wrote:

> Quoting from the patch: "While we are never normally passed an 
> instruction that exceeds 15 bytes, smp games can cause us to attempt
> to 
> interpret one, which will cause large latencies in non-preempt
> hosts."
>
> http://git.kernel.org/?p=linux/kernel/git/avi/kvm.git;a=commitdiff;h=e42d9b8141d1f54ff72ad3850bb110c95a5f3b88
> https://bugzilla.redhat.com/show_bug.cgi?id=541160
>
> I understand that a malicious guest can cause long scheduling
> latencies 
> in the host, resulting in a denial of service, but I have not 
> investigated this further to determine if it has more severe
> consequences.
>
> Thanks, Eugene
> -- 
> Eugene Teo / Red Hat Security Response Team