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

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Message-ID: <1084415133.30031259168372226.JavaMail.root@zmail01.collab.prod.int.phx2.redhat.com>
Date: Wed, 25 Nov 2009 11:59:32 -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: kernel: KVM: x86 emulator: limit
 instructions to 15 bytes

Please use CVE-2009-4031 for this.

Thanks

-- 
    JB

----- "Eugene Teo" <eugeneteo@...nel.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

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