Re: [edk2-devel] [edk2-discuss] Attempted runtime pool allocation returns non-runtime pool

["Oliver Smith-Denny via groups.io" <osde=linux.microsoft.com@groups.io>]

Hi Adam,

> On Wed, 4 Dec 2024 at 04:21, Adam Wagner via groups.io
> <adwags=gmail.com@groups.io> wrote:
>>
>> Hello,
>>
>> I have a DXE runtime driver that is attempting to allocate runtime pool
>> (via AllocateRuntimeZeroPool). I'm getting back a non-NULL pointer, but it
>> isn't in the runtime memory map so ConvertPointer fails later. It looks
>> like the returned address is in a memory region of "conventional" type
>> which if I understand correctly is where free memory lives?
>>
>> I think I may be hitting the "Attempt to find free pages in the default
>> allocation bin" case here...
>> https://github.com/tianocore/edk2/blob/master/MdeModulePkg/Core/Dxe/Mem/Page.c#L1281
>>

This piece is fine if it doesn't hit the normal memory bin, it will
still get the type converted in the call to CoreConvertPages. I agree
with Leif that AllocateRuntimeZeroPool should not be returning the
memory if anything failed; what I would recommend is adding some prints
or using a debugger to tell if the memory is getting the correct type
on that allocate call and then checking if it is getting freed later
by some entity.

Oliver



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