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Code Issues Activity

operating-systems: Add mitigation flags, fix typo (#1269)

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Co-authored-by: Jan Pobříslo <ccx@te2000.cz>
This commit is contained in:
Mikaela Suomalainen
2019-09-29 16:25:27 +03:00
committed by Dawid Potocki
parent 0519c153f0
commit b9dee94d9d
1 changed files with 4 additions and 3 deletions
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_includes/sections/operating-systems.html
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@@ -53,16 +53,17 @@ gitlab="https://salsa.debian.org/qa/debsources"
<ol>
<li><code>sudo mkdir /etc/default/grub.d/</code> to create a directory for additional grub configuration</li>
<li><code>echo GRUB_CMDLINE_LINUX_DEFAULT="$GRUB_CMDLINE_LINUX_DEFAULT mds=full,nosmt" | sudo tee /etc/default/grub.d/mds.conf</code> to create a new grub config file source with the echoed content</li>
<li><code>sudo grub-mkconfig -o /boot/grub/grub.cfg</code> to generate a new grub config file including this new kernel boot flag</li>
<li><code>echo GRUB_CMDLINE_LINUX_DEFAULT="$GRUB_CMDLINE_LINUX_DEFAULT l1tf=full,force mds=full,nosmt mitigations=auto,nosmt nosmt=force" | sudo tee /etc/default/grub.d/mitigations.cfg</code> to create a new grub config file source with the echoed content</li>
<li><code>sudo grub-mkconfig -o /boot/grub/grub.cfg</code> to generate a new grub config file including these new kernel boot flags</li>
<li><code>sudo reboot</code> to reboot</li>
<li>after the reboot, check <code>tail -n +1 /sys/devices/system/cpu/vulnerabilities/*</code> again to see that MDS now says "SMT disabled."</li>
<li>after the reboot, check <code>tail -n +1 /sys/devices/system/cpu/vulnerabilities/*</code> again to see that everything referring to SMT now says "SMT disabled."</li>
</ol>
<h5>Further reading</h5>
<ul>
<li><a href="https://cpu.fail/">CPU.fail</a></li>
<li><a href="https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/">Hardware vulnerabilities index on The Linux kernel user's and administrator's guide</a></li>
<li><a href="https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/mds.html">MDS - Microarchitectural Data Sampling on The Linux kernel user's and administrator's guide</a></li>
<li><a href="https://mdsattacks.com/">RIDL and Fallout: MDS attacks on mdsattacks.com</a></li>
<li><a href="https://en.wikipedia.org/wiki/Simultaneous_multithreading">Simultaneous multithreading on Wikipedia</a></li>