[FreeBSD-Announce] FreeBSD Security Advisory FreeBSD-SA-19:07.mds

[Mark Johnston]

On Wed, May 15, 2019 at 09:33:50AM -0500, Kyle Evans wrote:
> On Wed, May 15, 2019 at 8:33 AM mike tancsa <mike at sentex.net> wrote:
> >
> > On 5/15/2019 8:18 AM, Wall, Stephen wrote:
> > >> New CPU microcode may be available in a BIOS update from your system vendor,
> > >> or by installing the devcpu-data package or sysutils/devcpu-data port.
> > >> Ensure that the BIOS update or devcpu-data package is dated after 2014-05-14.
> > >>
> > >> If using the package or port the microcode update can be applied at boot time
> > >> by adding the following lines to the system's /boot/loader.conf:
> > >>
> > >> cpu_microcode_load="YES"
> > >> cpu_microcode_name="/boot/firmware/intel-ucode.bin"
> > > Is this applicable in a virtualized environment, or only on bare metal?
> > > If not applicable in a VM, is it at least harmless?
> >
> >
> > Actually, just tried this on RELENG_11 (r347613)  and I get
> >
> > don't know how to load module '/boot/firmware/intel-ucode.bin'
> >
> > In boot/loader.conf I have
> >
> > cpu_microcode_load="YES"
> > cpu_microcode_name="/boot/firmware/intel-ucode.bin"
> >
> > # ls -l /boot/firmware/intel-ucode.bin
> > -rw-r--r--  1 root  wheel  uarch 2571264 May 15 08:47
> > /boot/firmware/intel-ucode.bin
> >
> > # sha256 /boot/firmware/intel-ucode.bin
> > SHA256 (/boot/firmware/intel-ucode.bin) =
> > 1fdb3a25467d285394eded8039ee8ab488f074903654981d35a4cdfe6ebf12fc
> >
> 
> r337715 + r337716 were responsible for making this work, and they've
> not yet been MFC'd as far as I can tell. CC markj@, because that's
> probably good to sneak in soon.

I'm working on this.  In any case, 11.2 doesn't have and won't get
boot-time microcode update support, so an updated SA with instructions
for 11 will be released shortly.