[coreboot-gerrit] Change in coreboot[master]: cpu/x86/smm: Add sinkhole mitigation to relocatable smmstub

[Arthur Heymans (Code Review)]

Attention is currently required from: Arthur Heymans.
Hello build bot (Jenkins), Martin Roth, Angel Pons, Aaron Durbin,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/37289

to look at the new patch set (#7).

Change subject: cpu/x86/smm: Add sinkhole mitigation to relocatable smmstub
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cpu/x86/smm: Add sinkhole mitigation to relocatable smmstub

The sinkhole exploit exists in placing the lapic base such that it
messes with GDT. This can be mitigated by checking the lapic MSR
against the current program counter.

Change-Id: I49927c4f4218552b732bac8aae551d845ad7f079
Signed-off-by: Arthur Heymans 
---
M src/cpu/x86/smm/smm_stub.S
1 file changed, 39 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/89/37289/7