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Re: [PATCH 2/6] Align all sections to 4KB
- To: Jan Beulich <jbeulich@xxxxxxxx>, Frediano Ziglio <freddy77@xxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 2 Jun 2026 14:06:15 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Frediano Ziglio <frediano.ziglio@xxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 02 Jun 2026 13:06:33 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 02/06/2026 1:09 pm, Jan Beulich wrote:
> On 29.05.2026 17:35, Frediano Ziglio wrote:
>> Required by UEFI CA memory mitigation.
> Imo this isn't enough for a description: At the very least you want to
> point at where that requirement is spelled out.
It is a requirement for NX_COMPAT so the PE can be loaded with W^X perms
in the pagetables.
NX_COMPAT is a requirement from shim-review,
https://github.com/rhboot/shim-review#do-you-have-the-nx-bit-set-in-your-shim-if-so-is-your-entire-boot-stack-nx-compatible-and-what-testing-have-you-done-to-ensure-such-compatibility
The discussed exception is (AFAICT) only for re-signing an
previously-accepted blobs, and is not usable for new downstream products
(which is what Xen is in this context).
~Andrew
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