|
 |
3a6b56 |
Intel Skulake Scalable Platform CPU models that belong to Workstation and HEDT
|
|
|
3a6b56 |
(Basin Falls) segment (SKL-W/X, family 6, model 85, stepping 4) have reports
|
|
|
3a6b56 |
of system hangs on reboot when revision 0x2000065 of microcode, that is included
|
|
|
3a6b56 |
since microcode-20191112 update, is applied[1]. In order to address this,
|
|
|
3a6b56 |
microcode update to this revision has been disabled by default on these systems,
|
|
|
078ac8 |
and the previously published microcode revision 0x2000064 is used by default
|
|
|
078ac8 |
for the OS-driven microcode update.
|
|
|
078ac8 |
|
|
|
3a6b56 |
[1] https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/issues/21
|
|
|
3a6b56 |
|
|
|
078ac8 |
For the reference, SHA1 checksums of 06-55-04 microcode files containing
|
|
|
078ac8 |
microcode revisions in question are listed below:
|
|
|
078ac8 |
* 06-55-04, revision 0x2000064: 2e405644a145de0f55517b6a9de118eec8ec1e5a
|
|
|
078ac8 |
* 06-55-04, revision 0x2000065: f27f12b9d53f492c297afd856cdbc596786fad23
|
|
|
078ac8 |
|
|
|
078ac8 |
Please contact your system vendor for a BIOS/firmware update that contains
|
|
|
078ac8 |
the latest microcode version. For the information regarding microcode versions
|
|
|
078ac8 |
required for mitigating specific side-channel cache attacks, please refer
|
|
|
078ac8 |
to the following knowledge base articles:
|
|
|
078ac8 |
* CVE-2017-5715 ("Spectre"):
|
|
|
078ac8 |
https://access.redhat.com/articles/3436091
|
|
|
078ac8 |
* CVE-2018-3639 ("Speculative Store Bypass"):
|
|
|
078ac8 |
https://access.redhat.com/articles/3540901
|
|
|
078ac8 |
* CVE-2018-3620, CVE-2018-3646 ("L1 Terminal Fault Attack"):
|
|
|
078ac8 |
https://access.redhat.com/articles/3562741
|
|
|
078ac8 |
* CVE-2018-12130, CVE-2018-12126, CVE-2018-12127, and CVE-2019-11091
|
|
|
078ac8 |
("Microarchitectural Data Sampling"):
|
|
|
078ac8 |
https://access.redhat.com/articles/4138151
|
|
|
078ac8 |
* CVE-2019-0117 (Intel SGX Information Leak),
|
|
|
078ac8 |
CVE-2019-0123 (Intel SGX Privilege Escalation),
|
|
|
078ac8 |
CVE-2019-11135 (TSX Asynchronous Abort),
|
|
|
078ac8 |
CVE-2019-11139 (Voltage Setting Modulation):
|
|
|
078ac8 |
https://access.redhat.com/solutions/2019-microcode-nov
|
|
|
078ac8 |
|
|
|
078ac8 |
The information regarding enforcing microcode update is provided below.
|
|
|
078ac8 |
|
|
|
078ac8 |
To enforce usage of the 0x2000065 microcode revision for a specific kernel
|
|
|
078ac8 |
version, please create a file "force-intel-06-55-04" inside
|
|
|
078ac8 |
/lib/firmware/<kernel_version> directory, run
|
|
|
078ac8 |
"/usr/libexec/microcode_ctl/update_ucode" to add it to firmware directory
|
|
|
078ac8 |
where microcode will be available for late microcode update, and run
|
|
|
078ac8 |
"dracut -f --kver <kernel_version>", so initramfs for this kernel version
|
|
|
078ac8 |
is regenerated and the microcode can be loaded early, for example:
|
|
|
078ac8 |
|
|
|
078ac8 |
touch /lib/firmware/3.10.0-862.9.1/force-intel-06-55-04
|
|
|
078ac8 |
/usr/libexec/microcode_ctl/update_ucode
|
|
|
078ac8 |
dracut -f --kver 3.10.0-862.9.1
|
|
|
078ac8 |
|
|
|
078ac8 |
After that, it is possible to perform a late microcode update by executing
|
|
|
078ac8 |
"/usr/libexec/microcode_ctl/reload_microcode" or by writing value "1" to
|
|
|
078ac8 |
"/sys/devices/system/cpu/microcode/reload" directly.
|
|
|
078ac8 |
|
|
|
078ac8 |
To enforce addition of this microcode for all kernels, please create file
|
|
|
078ac8 |
"/etc/microcode_ctl/ucode_with_caveats/force-intel-06-55-04", run
|
|
|
078ac8 |
"/usr/libexec/microcode_ctl/update_ucode" for enabling late microcode updates,
|
|
|
078ac8 |
and "dracut -f --regenerate-all" for enabling early microcode updates:
|
|
|
078ac8 |
|
|
|
078ac8 |
mkdir -p /etc/microcode_ctl/ucode_with_caveats
|
|
|
078ac8 |
touch /etc/microcode_ctl/ucode_with_caveats/force-intel-06-55-04
|
|
|
078ac8 |
/usr/libexec/microcode_ctl/update_ucode
|
|
|
078ac8 |
dracut -f --regenerate-all
|
|
|
078ac8 |
|
|
|
078ac8 |
Please refer to /usr/share/doc/microcode_ctl/README.caveats for additional
|
|
|
078ac8 |
information.
|