Re: [edk2-devel] [PATCH v1] MdeModulePkg: Fixup MAT Attributes After Splitting EFI Memory Map

["Oliver Smith-Denny" <osde@linux.microsoft.com>]

On 4/17/2024 2:41 PM, Oliver Smith-Denny wrote:
> Now, for the case of ARM64, where you have 64k runtime
> granularity and often will end up with the case of many
> extra pages in a code section, those pages will be marked
> as RO and executable, even though they contain garbage. I think
> it would be worthwhile to mark the excess garbage pages, if they
> exist for a given section, as RP. Nothing should be using them
> in any fashion, they are padding.

I thought this through some more. We can't do this because of
the UEFI spec provision that says no 64k region can have different
attributes set. So, we leave open the possibility of executing
garbage :)

Oliver


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