3e73f633e5
Sync with current RHEL 8.5 packaging. Resolves: #1880064 Signed-off-by: Eugene Syromiatnikov <esyr@redhat.com>
84 lines
3.9 KiB
Plaintext
84 lines
3.9 KiB
Plaintext
Intel Broadwell-EP/EX (BDX-ML B/M/R0, family 6, model 79, stepping 1) has issues
|
|
with microcode update that may lead to a system hang; while some changes
|
|
to the Linux kernel have been made in an attempt to address these issues,
|
|
they were not eliminated, so a possibility of unstable system behaviour
|
|
after a microcode update performed on a running system is still present even
|
|
on a kernels that contain aforementioned changes. As a result, microcode update
|
|
for this CPU model has been disabled by default.
|
|
|
|
For the reference, kernel versions for the respective RHEL minor versions
|
|
that contain the aforementioned changes, are listed below:
|
|
* Upstream/RHEL 8: kernel-4.17.0 or newer;
|
|
* RHEL 7.6 onwards: kernel-3.10.0-894 or newer;
|
|
* RHEL 7.5.z: kernel-3.10.0-862.6.1 or newer;
|
|
* RHEL 7.4.z: kernel-3.10.0-693.35.1 or newer;
|
|
* RHEL 7.3.z: kernel-3.10.0-514.52.1 or newer;
|
|
* RHEL 7.2.z: kernel-3.10.0-327.70.1 or newer.
|
|
|
|
Please contact you system vendor for a BIOS/firmware update that contains
|
|
the latest microcode version. For the information regarding microcode versions
|
|
required for mitigating specific side-channel cache attacks, please refer
|
|
to the following knowledge base articles:
|
|
* CVE-2017-5715 ("Spectre"):
|
|
https://access.redhat.com/articles/3436091
|
|
* CVE-2018-3639 ("Speculative Store Bypass"):
|
|
https://access.redhat.com/articles/3540901
|
|
* CVE-2018-3620, CVE-2018-3646 ("L1 Terminal Fault Attack"):
|
|
https://access.redhat.com/articles/3562741
|
|
* CVE-2018-12130, CVE-2018-12126, CVE-2018-12127, and CVE-2019-11091
|
|
("Microarchitectural Data Sampling"):
|
|
https://access.redhat.com/articles/4138151
|
|
* CVE-2020-24489 (VT-d-related Privilege Escalation),
|
|
CVE-2020-24511 (Improper Isolation of Shared Resources),
|
|
CVE-2020-24512 (Observable Timing Discrepancy),
|
|
CVE-2020-24513 (Information Disclosure on Some Intel Atom Processors):
|
|
https://access.redhat.com/articles/6101171
|
|
|
|
The information regarding enforcing microcode load is provided below.
|
|
|
|
For enforcing addition of this microcode to the firmware directory
|
|
for a specific kernel, where it is available for a late microcode update,
|
|
please create a file "force-late-intel-06-4f-01" inside
|
|
/lib/firmware/<kernel_version> directory and run
|
|
"/usr/libexec/microcode_ctl/update_ucode":
|
|
|
|
touch /lib/firmware/3.10.0-862.9.1/force-late-intel-06-4f-01
|
|
/usr/libexec/microcode_ctl/update_ucode
|
|
|
|
After that, it is possible to perform a late microcode update by executing
|
|
"/usr/libexec/microcode_ctl/reload_microcode" or by writing value "1" to
|
|
"/sys/devices/system/cpu/microcode/reload" directly.
|
|
|
|
For enforcing addition of this microcode to firmware directories for all
|
|
kernels, please create a file
|
|
"/etc/microcode_ctl/ucode_with_caveats/force-late-intel-06-4f-01"
|
|
and run "/usr/libexec/microcode_ctl/update_ucode":
|
|
|
|
mkdir -p /etc/microcode_ctl/ucode_with_caveats
|
|
touch /etc/microcode_ctl/ucode_with_caveats/force-late-intel-06-4f-01
|
|
/usr/libexec/microcode_ctl/update_ucode
|
|
|
|
For enforcing early load of this microcode for a specific kernel, please
|
|
create a file "force-early-intel-06-4f-01" inside
|
|
"/lib/firmware/<kernel_version>" directory and run
|
|
"dracut -f --kver <kernel_version>":
|
|
|
|
touch /lib/firmware/3.10.0-862.9.1/force-early-intel-06-4f-01
|
|
dracut -f --kver 3.10.0-862.9.1
|
|
|
|
For enforcing early load of this microcode for all kernels, please
|
|
create a file "/etc/microcode_ctl/ucode_with_caveats/force-early-intel-06-4f-01"
|
|
and run dracut -f --regenerate-all:
|
|
|
|
mkdir -p /etc/microcode_ctl/ucode_with_caveats
|
|
touch /etc/microcode_ctl/ucode_with_caveats/force-early-intel-06-4f-01
|
|
dracut -f --regenerate-all
|
|
|
|
If you want to avoid removal of the microcode file during cleanup performed by
|
|
/usr/libexec/microcode_ctl/update_ucode, please remove the corresponding readme
|
|
file (/lib/firmware/<kernel_version>/readme-intel-06-4f-01).
|
|
|
|
|
|
Please refer to /usr/share/doc/microcode_ctl/README.caveats for additional
|
|
information.
|