[CentOS-virt] CentOS-virt - Kernel Side-Channel Attacks

George Dunlap dunlapg at umich.edu
Fri Jan 5 12:33:15 UTC 2018


On Thu, Jan 4, 2018 at 7:12 PM, Sarah Newman <srn at prgmr.com> wrote:
> On 01/04/2018 10:49 AM, Akemi Yagi wrote:
>> On Thu, Jan 4, 2018 at 9:51 AM, <rikske at deds.nl> wrote:
>>
>>> Please patch the CentOS-virt Kernel to fix the
>>> Kernel Side-Channel Attacks vulnerabilities.
>>>
>>> The latest CentOS-virt kernel was released in November, as seen below.
>>>
>>> kernel-4.9.63-29.el7.x86_64.rpm 2017-11-21 13:30
>>>
>>> https://access.redhat.com/security/vulnerabilities/speculativeexecution
>>> http://mirror.centos.org/centos/7/virt/x86_64/xen/
>>>
>>
>> As far as I can see, the patches for
>> KAISER (Kernel Address
>> Isolation to have Side-channels Efficiently Removed) will appear in
>> kernel 4.9.75. Looks like it will be released soon upstream (kernel.org).
>>
>
> To my best knowledge KAISER doesn't matter for Xen Dom0's given they run in PV mode, and KAISER isn't enabled for PV guests.

But it will be important if anyone is running the CentOS kernel in
their HVM domUs (as guest kernels can be attacked using SP3 by guest
user space without the KPTI patches).

I'm sure Johnny will get to it as soon as he has the opportunity.

 -George


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