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Re: [PATCH 5/7] x86/mkreloc: remove warning about relocations to RO section
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 20 Mar 2025 10:53:13 +0100
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- Cc: "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 20 Mar 2025 09:53:24 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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. (By implication this
would mean they needlessly load all the .debug_* sections as well. Then again we
need to be glad they ignore the discard flag, or else .reloc wouldn't be loaded
either.)
Jan
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