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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