[edk2-devel] [RFC PATCH v2 7/7] ArmVirtPkg: Implement BTI for runtime regions

[Michael Brown]

On 03/02/2023 12:55, Ard Biesheuvel wrote:
>> Question: as a producer of externally loaded UEFI binaries (e.g.
>> ipxe.efi): what would I need to do to take advantage of BTI?
>>
>> I'm assuming:
>>
>> - enable -mbranch-protection=bti in my builds (easy)
>>
>> - wait for PE/COFF specification change and then update my produced
>> images to include whatever flag gets decided upon.
>>
>> Is that correct?
> 
> First of all, in case you missed this, the series in question only
> covers runtime DXE drivers, i.e., the code that persists after
> ExitBootServices() and gets mapped by the OS and called to access the
> variable store. So iPXE should not be affected at all by these
> changes.

I was not paying close attention to this patch series and had missed 
that detail: thank you for clarifying.

> So to answer your question: yes.

Thank you!

Michael



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