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I've never tried protecting the stack like this, so I'm not sure exactly what you're running in to.  The documentation says the base address is specified a bit differently for expand-down descriptors.  It needs to point to the page below the stack (lower addresses.)  The descriptors f= or the other segments would still need to cover the entire address space (limit 0xFFFF, page-granular, expand-up.)  And you'd need to use a different segment selector (and hence a different GDT entry) for the stack segment (ss register) than for the regular data segments.  Most of the early PEI code I've seen uses the same selector for ds, ef, fs, gs, and ss.

Hope that helps.  This is mostly theoretical.  I don= 't actually have a lot of experience with x86 segment programming.

Brian J. Johnson
From: Tiger Liu(BJ-RD) [mailto:TigerLiu@zhaoxin.com]
Sent: Wednesday, September 21, 2022, 10:32 PM
Subject: [edk2-devel] How to guard CAR's stack overflow

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

Hi, Johnson:

Thanks for your reply!=

 

I tried and found it seemed causing some other problems.

 

It hang in eary pei stage.

 

It seems below code could also cause an exception if using expand-down mode in CAR phase=E2=80=99s stack established.

mov eax, ss:[ebx]  

 mov eax, [ebp]

  mov eax, [esp]

 

Thanks

=E5=8F=91=E4=BB=B6=E4=BA=BA: Brian J. Johnson <brian.johnson@hpe.com
=E5=8F=91=E9=80=81= =E6=97=B6=E9=97=B4: 2022=E5=B9=B49=E6=9C=8820=E6=97=A5 7:10
=E6=94=B6=E4=BB=B6=E4=BA=BA:= = devel@edk2.groups.io; ray.ni@intel.com; Tiger Liu(BJ-RD) <TigerLiu@zhaox= in.com
=E6=8A=84=E9=80=81: Fan, Jeff <fanjianfe= ng@byosoft.com.cn
=E4=B8=BB=E9=A2=98: Re: [edk2-devel] How to guard CAR's stack overflow

 

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 stack overflows, and wouldn't require building page tables.  See sections 5.1 - 5.3 of the Intel SDM, volume 3.

 

Brian J. Johnson

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).

 

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

<= span lang=3D"EN-US"> 

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 sta= ck 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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