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Re: [PATCH 5/7] x86/mkreloc: remove warning about relocations to RO section
- To: Jan Beulich <jbeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Thu, 20 Mar 2025 11:00:28 +0000
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- Cc: "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 20 Mar 2025 11:00:38 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 20/03/2025 10:18 am, Jan Beulich wrote:
> On 20.03.2025 10:53, Jan Beulich wrote:
>> On 20.03.2025 09:34, Jan Beulich wrote:
>>> On 20.03.2025 09:14, Roger Pau Monné wrote:
>>>> I wonder how this worked then, as I've tested with the xen.efi smoke
>>>> test in gitlab CI. Maybe ovmf doesn't acknowledge the RX sections and
>>>> unconditionally sets all mappings as writable?
>>> Possible. And that would be in line with the mode being call "physical
>>> mode":
>>> There are no permissions to enforce there. It just so happens that x86-64
>>> requires paging to be enabled to be able to run 64-bit code.
>>>
>>> My experience with OVMF has been that it's hard to find where certain code
>>> lives. Perhaps I should try whether I can find respective code there. Then
>>> again if I find nothing, there wouldn't be any guarantee that I merely
>>> didn't
>>> spot the right place.
>> All I can find is
>> BaseTools/Source/C/Common/BasePeCoff.c:PeCoffLoaderLoadImage(),
>> which doesn't look to care about section flags at all.
> And then there is at least one duplicate thereof elsewhere, or something very
> close to a duplicate. In addition I meanwhile found ProtectUefiImage(), yet
> it's unclear (to me) under what conditions execution would make it there. Plus
> it leading to SetUefiImageMemoryAttributes() leaves open where
> gCpu->SetMemoryAttributes() is implemented. I can spot some Arm and RISC-V
> code
> with respective names (albeit in distinct places), and MTRR functionality with
> names along these lines. None of these can be it.
https://www.kraxel.org/blog/2023/12/uefi-nx-linux-boot/
~Andrew
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