[coreboot-gerrit] Change in coreboot[master]: SMM: Validate more user-provided pointers

[Angel Pons (Code Review)]

Angel Pons has uploaded a new patch set (#20) to the change originally created by Patrick Rudolph. ( https://review.coreboot.org/c/coreboot/+/41086 )

Change subject: SMM: Validate more user-provided pointers
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SMM: Validate more user-provided pointers

Mitigate issues presented in "Digging Into The Core of Boot" found by
"Yuriy Bulygin" and "Oleksandr Bazhaniuk" at RECON-MTL-2017.

Validate user-provided pointers using the newly-added functions.
This protects SMM from ring0 attacks.

Change-Id: I8a347ccdd20816924bf1bceb3b24bf7b22309312
Signed-off-by: Patrick Rudolph 
Signed-off-by: Christian Walter 
---
M src/mainboard/lenovo/t60/smihandler.c
M src/soc/intel/baytrail/smihandler.c
M src/soc/intel/braswell/smihandler.c
M src/soc/intel/broadwell/smihandler.c
M src/soc/intel/common/block/smm/smihandler.c
M src/southbridge/intel/bd82x6x/smihandler.c
M src/southbridge/intel/ibexpeak/smihandler.c
M src/southbridge/intel/lynxpoint/smihandler.c
8 files changed, 58 insertions(+), 14 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/86/41086/20