Re: Fwd: Re: Intel / AMD CPU Microcode Updates Required For Security

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On Sun, 2017-05-28 at 19:50 -0600, JD wrote:
> Is fedora providing this?
> 
> 
> -------- Forwarded Message --------
> Subject: 	Re: Intel / AMD CPU Microcode Updates Required For
> Security
> Date: 	Sun, 28 May 2017 23:52:46 +0000
> From: 	Ben Woods <woodsb02@xxxxxxxxx>
> To: 	RW <rwmaillists@xxxxxxxxxxxxxx>, freebsd-questions@freebs
> d.org, 
> freebsd-security@xxxxxxxxxxx
> 
> 
> 
> On Mon, 29 May 2017 at 7:35 am, RW via freebsd-questions <
> freebsd-questions@xxxxxxxxxxx> wrote:
> 
> > On Sun, 28 May 2017 17:53:01 -0400
> > grarpamp wrote:
> > 
> > > Blobs that fix exploitable things may be slightly better than
> > > blobs.
> > > Awareness should be raised, and updates applied to systems.
> > > 
> > > # sysutils/devcpu-data New Microcode Released for Intel / AMD
> > > https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219268
> > 
> > Is there a standard way to run cpucontrol? There doesn't seem to be
> > an
> > rc.d script.
> 
> 
> There is an rc script installed with this port:
> 
> https://svnweb.freebsd.org/ports/head/sysutils/devcpu-data/files/micr
> ocode_update.in?view=markup
> 
> Regards,
> Ben
> 
> > --
> 

Yes, Fedora does provide intel and amd x86 processor microcode updates.
(in linux-firmware (amd (/lib/firmware/amd-ucode), and intel
(microcode-ctl) (/lib/firmware/intel-ucode)) And it uses linux early
microcode way of loading microcode (It is prepended (at least I think
it is) to initramfs):

[bgrubic@quad ~]$ cpio -t -F initramfs-4.11.3-300.fc26.x86_64.img 
.
early_cpio
kernel
kernel/x86
kernel/x86/microcode
kernel/x86/microcode/GenuineIntel.bin
58 blocks

Also on boot (kernel log) you possibly can see something like this:

[    0.000000] microcode: microcode updated early to revision 0xba,
date = 2010-10-03
[    0.810945] microcode: sig=0x6fb, pf=0x10, revision=0xba
[    0.811007] microcode: Microcode Update Driver: v2.2.

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