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55 lines
2.7 KiB
55 lines
2.7 KiB
Intel Sandy Bridge-E/EN/EP (SNB-EP, family 6, model 45, stepping 7) has issues |
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with MDS-related microcode update that may lead to a system hang after |
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a microcode update. In order to address this, microcode update |
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to the MDS-related revision 0x718 has been disabled, and the previously |
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published microcode revision 0x714 is used by default for the OS-driven |
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microcode update. |
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For the reference, SHA1 checksums of 06-2d-07 microcode files containing |
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microcode revisions in question are listed below: |
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* 06-2d-07, revision 0x714: bcf2173cd3dd499c37defbc2533703cfa6ec2430 |
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* 06-2d-07, revision 0x718: 837cfebbfc09b911151dfd179082ad99cf87e85d |
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Please contact your system vendor for a BIOS/firmware update that contains |
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the latest microcode version. For the information regarding microcode versions |
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required for mitigating specific side-channel cache attacks, please refer |
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to the following knowledge base articles: |
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* CVE-2017-5715 ("Spectre"): |
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https://access.redhat.com/articles/3436091 |
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* CVE-2018-3639 ("Speculative Store Bypass"): |
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https://access.redhat.com/articles/3540901 |
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* CVE-2018-3620, CVE-2018-3646 ("L1 Terminal Fault Attack"): |
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https://access.redhat.com/articles/3562741 |
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* CVE-2018-12130, CVE-2018-12126, CVE-2018-12127, and CVE-2019-11091 |
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("Microarchitectural Data Sampling"): |
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https://access.redhat.com/articles/4138151 |
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The information regarding enforcing microcode load is provided below. |
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To enforce usage of this microcode revision, please create a file |
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"force-intel-06-2d-07" inside /lib/firmware/<kernel_version> directory, |
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run "/usr/libexec/microcode_ctl/update_ucode" to add it to firmware |
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directory where microcode will be available for late microcode update, |
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and run "dracut -f --kver 3.10.0-862.9.1", so initramfs for this version |
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is regenerated and the microcode can be loaded early: |
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touch /lib/firmware/3.10.0-862.9.1/force-intel-06-2d-07 |
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/usr/libexec/microcode_ctl/update_ucode |
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dracut -f --kver 3.10.0-862.9.1 |
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After that, it is possible to perform a late microcode update by executing |
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"/usr/libexec/microcode_ctl/reload_microcode" or by writing value "1" to |
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"/sys/devices/system/cpu/microcode/reload" directly. |
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To enforce addition of this microcode for all kernels, please create a file |
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"/etc/microcode_ctl/ucode_with_caveats/force-intel-06-2d-07", run |
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"/usr/libexec/microcode_ctl/update_ucode" for enabling late microcode updates, |
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and "dracut -f --regenerate-all" for enabling early microcode updates: |
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mkdir -p /etc/microcode_ctl/ucode_with_caveats |
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touch /etc/microcode_ctl/ucode_with_caveats/force-intel-06-2d-07 |
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/usr/libexec/microcode_ctl/update_ucode |
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dracut -f --regenerate-all |
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Please refer to /usr/share/doc/microcode_ctl/README.caveats for additional |
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information.
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