Module Name: src
Committed By: martin
Date: Tue Jul 25 09:10:32 UTC 2023
Modified Files:
src/sys/arch/x86/include [netbsd-10]: specialreg.h
src/sys/arch/x86/x86 [netbsd-10]: errata.c
Log Message:
Pull up following revision(s) (requested by mrg in ticket #243):
sys/arch/x86/include/specialreg.h: revision 1.207
sys/arch/x86/x86/errata.c: revision 1.31
x86: turn off zenbleed chicken bit on Zen2 cpus.
this is based upon Taylor's original work. i just made the list
of CPUs to run on correct as i could determine. (also, add some
Zen3 and Zen4 cpuids not yet used by any errata.)
(might be nice to have a better way to expression revision ranges
rather than specific cpuid matches, eg, 0x30-0x4f models in a cpu
family, etc.)
tested on ryzen 3600, and a ported zenbleed PoC that no longer
shows any obtained text. (a similar module-version of it stopped
the PoC on a ryzen 3950x without having to reboot.)
https://www.amd.com/en/resources/product-security/bulletin/amd-sb-7008.html
https://lock.cmpxchg8b.com/zenbleed.html
To generate a diff of this commit:
cvs rdiff -u -r1.198.2.2 -r1.198.2.3 src/sys/arch/x86/include/specialreg.h
cvs rdiff -u -r1.27 -r1.27.4.1 src/sys/arch/x86/x86/errata.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
