If the kernel is not NX_COMPAT ready (W^X memory compatible) then the UKI should not be marked as NX_COMPAT ready either, as the kernel section is the loadable code in the image. https://microsoft.github.io/mu/WhatAndWhy/enhancedmemoryprotection/ https://www.kraxel.org/blog/2023/12/uefi-nx-linux-boot/ While the sd-stub EFI code itself is NX ready, it is more useful to think of it as one unit of execution together with the kernel it embeds, as that's what it is used for. Fixes https://github.com/systemd/systemd/issues/38545
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