bugzilla-daemon at bugzilla.tianocore.org...
Bug ID: 246
Summary: UefiCpuDriver IA32 stack guard will report #double
fault, instead of #page fault on violation. It brings
confusing to the developer.
Current EDKII SMM page protection will lock GDT.
If IA32 stack guard is enabled, the page fault handler will do task switch.
This task switch need write busy flag in GDT, and write TSS.
However, the GDT and TSS is locked at that time. so the double fault happens.
One possible solution is:
We make a special GDT which CS/DS at read-only page, and TSS segment at
Then the normal code can being protected, because it does not touch TSS.
When page fault happens, the TSS region can be writeable.
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