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
------------------------------------------------------------------------
*From:* Ni, Ray [mailto:ray...@intel.com]
*Sent:* Wednesday, September 14, 2022, 10:25 PM
*To:* devel@edk2.groups.io <devel@edk2.groups.io>, tiger...@zhaoxin.com
<tiger...@zhaoxin.com>
*Cc:* Fan, Jeff <fanjianf...@byosoft.com.cn>
*Subject:* [edk2-devel] How to guard CAR's stack overflow
It’s 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
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’s 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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