From mboxrd@z Thu Jan 1 00:00:00 1970 From: ben.hutchings@codethink.co.uk (Ben Hutchings) Date: Thu, 16 May 2019 17:29:26 +0100 Subject: [cip-dev] MDS and other speculation issues In-Reply-To: References: <1557920010.3952.2.camel@codethink.co.uk> Message-ID: <1558024166.3952.4.camel@codethink.co.uk> To: cip-dev@lists.cip-project.org List-Id: cip-dev.lists.cip-project.org On Thu, 2019-05-16 at 00:44 +0000, nobuhiro1.iwamatsu at toshiba.co.jp wrote: > Hi Ben, > > > -----Original Message----- > > From: cip-dev-bounces at lists.cip-project.org > > > > [mailto:cip-dev-bounces at lists.cip-project.org] On Behalf Of Ben > > Hutchings > > Sent: Wednesday, May 15, 2019 8:34 PM > > To: cip-dev at lists.cip-project.org > > Subject: [cip-dev] MDS and other speculation issues > > > > As with the earlier speculation vulnerabilities, I don't believe that > > MDS should be a particularly severe issue for CIP-based systems. > > > > Nevertheless, I have prepared a backport of the mitigations for MDS (and > > some changes to the mitigations for other speculation issues) for 4.4. > > This was included in 4.4.180-rc1, which is out for review now.??I did > > not have the chance to test this thoroughly, so review and testing are > > needed. > > Thank you for your work and information. > I'm just looking into a test tool for this issue, but please let me know what > you already know. There is proof-of-concept exploit code, but it's not yet public, so far as I know. Nor do I have a copy. > There is a spectre-meltdown-checker, but we can not do a detailed test with this. > https://github.com/speed47/spectre-meltdown-checker/ That uses kernel interfaces to identify the affected CPUs and any mitigations that are enabled. However, it does not test whether the mitigation is actually effective, so it won't detect incomplete or incorrect backports. Ben. -- Ben Hutchings, Software Developer ? Codethink Ltd https://www.codethink.co.uk/ Dale House, 35 Dale Street Manchester, M1 2HF, United Kingdom