CVE-2012-0045: oss-security - Re: CVE request -

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Date: Wed, 11 Jan 2012 17:09:25 -0700 From: Kurt Seifried <kseifried@…hat.com> To: oss-security@…ts.openwall.com Subject: Re: CVE request – kernel: kvm: syscall instruction induced guest panic

On 01/11/2012 01:19 PM, Petr Matousek wrote:

"32bit guests will crash (and 64bit guests may behave in a wrong way) for example by simply executing following nasm-demo-application:

\[bits 32\]
global \_start
SECTION .text
\_start: syscall

The reason seems a missing “invalid opcode”-trap (int6) for the syscall opcode "0f05", which is not available on Intel CPUs within non-longmodes, as also on some AMD CPUs within legacy-mode. (depending on CPU vendor, MSR_EFER and cpuid)

Because previous mentioned OSs may not engage corresponding syscall target-registers (STAR, LSTAR, CSTAR), they remain NULL and (non trapping) syscalls are leading to multiple faults and finally crashs."

References: https://bugzilla.redhat.com/show_bug.cgi?id=773370 https://lkml.org/lkml/2011/12/28/170 http://www.spinics.net/lists/kvm/msg66633.html

Proposed patch: http://www.spinics.net/lists/kvm/msg66633.html

Credits: Stephan Bärwolf

Introduced by: e66bb2ccdcf76d032bbb464b35c292bb3ee58f9b in linux-2.6.32

Thanks, Please use CVE-2012-0045 for this issue.

–

– Kurt Seifried / Red Hat Security Response Team

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