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edk2-stable202102

edk2-stable202102: UefiCpuPkg/PiSmmCpuDxeSmm: Fix SMM stack offset is not correct
@swei22 swei22 tagged this 02 Mar 05:11 
In function InitGdt(), SmiPFHandler() and Gen4GPageTable(), it uses
 CpuIndex * mSmmStackSize to get the SMM stack address offset for
 multi processor. It misses the SMM Shadow Stack Size. Each processor
 will use mSmmStackSize + mSmmShadowStackSize in the memory.
It should use CpuIndex * (mSmmStackSize + mSmmShadowStackSize) to get
 this SMM stack address offset. If mSmmShadowStackSize > 0 and multi
 processor enabled, it will get the wrong offset value.
CET shadow stack feature will set the value of mSmmShadowStackSize.

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3237

Signed-off-by: Sheng Wei <[email protected]>
Cc: Eric Dong <[email protected]>
Cc: Ray Ni <[email protected]>
Cc: Laszlo Ersek <[email protected]>
Cc: Rahul Kumar <[email protected]>
Cc: Jiewen Yao <[email protected]>
Cc: Roger Feng <[email protected]>
Reviewed-by: Jiewen Yao <[email protected]>
Reviewed-by: Ray Ni <[email protected]>
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