If you see that after the update of your OS dmesg shows RED alert in the spectra check script in the second position then you should follow the intel's read.me. As in readme described on Centos 7.4: rsync -Pa intel-ucode /lib/firmware/ On the recent kernels(>2.6.xx) the dd method does not work, dont do that. To confirm that microcode loaded: dmesg | grep micro look for the release dates. But I beleve that v4 should be already in the microcode_ctl package of the CentOS7.4 ( in my case 2650v2 was not inside, but the v3 and v4 were there) I have a script to enable or disable the protection so you can see the performance impact on your case: https://arm2armcos.blogspot.de/2018/01/lustrefs-big-performance-hit-on-lfs.h... On Mon, Jan 15, 2018 at 4:28 PM, Derek Atkins <derek@ihtfp.com> wrote:
Arman,
Thanks for the info... And sorry for taking so long to reply. It's been a busy weekend.
First, thank you for the links. Useful information.
However, could you define "recent"? My system is from Q3 2016. Is that considered recent enough to not need a bios updte?
My /proc/cpuinfo reports: model name : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
I downloaded the microcode.tgz file, which is dated Jan 8. I noticed that the microcode_ctl package in my repo is dated Jan 4, which implies it probably does NOT contain the Jan 8 tgz from Intel. It LOOKS like I can just replace the intel-ucode files with those from the tgz, but I'm not sure what, if anything, I need to do with the microcode.dat file in the tgz?
Thanks,
-derek
Arman Khalatyan <arm2arm@gmail.com> writes:
if you have recent supermicro you dont need to update the bios,
Some tests: Crack test: https://github.com/IAIK/meltdown
Check test: https://github.com/speed47/spectre-meltdown-checker
the intel microcodes you can find here: https://downloadcenter.intel.com/download/27431/Linux-Processor-Microcode-Da... good luck. Arman.
On Thu, Jan 11, 2018 at 4:32 PM, Derek Atkins <derek@ihtfp.com> wrote:
Hi,
On Thu, January 11, 2018 9:53 am, Yaniv Kaul wrote:
No one likes downtime but I suspect this is one of those serious vulnerabilities that you really really must be protected against. That being said, before planning downtime, check your HW vendor for firmware or Intel for microcode for the host first. Without it, there's not a lot of protection anyway. Note that there are 4 steps you need to take to be fully protected: CPU, hypervisor, guests and guest CPU type - plan ahead! Y.
Is there a HOW-To written up somewhere on this? ;)
I built the hardware from scratch myself, so I can't go off to Dell or someone for this. So which do I need, motherboard firmware or Intel microcode? I suppose I need to go to the motherboard manufacturer (Supermicro) to look for updated firmware? Do I also need to look at Intel? Is this either-or or a "both" situation? Of course I have no idea how to reflash new firmware onto this motherboard -- I don't have DOS.
As you can see, planning I can do. Execution is more challenging ;)
Thanks!
Y.
-derek
-- Derek Atkins 617-623-3745 derek@ihtfp.com www.ihtfp.com Computer and Internet Security Consultant
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-- Derek Atkins 617-623-3745 derek@ihtfp.com www.ihtfp.com Computer and Internet Security Consultant