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You could also try modifying the Ia32 segment descriptors to mark the stack segment as an "expand down" type with a limit set just below the low end of the stack area.  That should generate a stack-fault exception if the sta= ck overflows, and wouldn't require building page tables.  See sections 5.1 - 5.3 of the Intel SDM, volume 3.

Brian J. Johnson

From: Ni, Ray [mailto:ray.ni@intel.com]
Sent: Wednesday, September 14, 2022, 10:25 PM
Subject: [edk2-devel] How to guard CAR's stack overflow

=20=20=20=20=20=20

It=E2=80=99s doable.

You need to enable paging and mark the very low 4K area of the stack as not-present.

You could use the UefiCpuPkg/Library/CpuPageTableLib to help you create the 1:1 page table with the specific
4K area as not-present (if you are using x86 processors).<= /o:p>

 

Thanks,

Ray

 

From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Tiger Liu(BJ-RD)
Sent: Thursday, September 15, 2022 8:50 AM
To: devel@edk2.groups.io
Subject: [edk2-devel] How to guard CAR's stack overflow

 

Hi, Experts:

Usually, we use Cache As Ram to setup stack and heap for C language running environment before permanent memory has been initialized.

 

So, is there a method to guard this phase=E2=80=99s stack overflow?

 

Note:

I find udk has introduced a method to guard stack overflow after memory has been initialized and discovered.

 

Thanks

=  

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