Re: [PATCH v4 3/3] x86: Align output sections for UEFI CA memory mitigation requirements

[Frediano Ziglio <frediano.ziglio@xxxxxxxxx>]

On Mon, Sep 23, 2024 at 4:54 PM Jan Beulich <jbeulich@xxxxxxxx> wrote:
>
> On 19.09.2024 10:00, Frediano Ziglio wrote:
> > All loadable sections should be page aligned.
>
> What about .buildid? .reloc otoh is discardable, and hence presumably okay
> if mis-aligned.
>
> Jan

Currently, internally we have a patch to make ".reloc" not discardaeble.
The problem is that in case of direct EFI loading, that section is
used to relocated back to the final location. On bootloaders
discarding that section, you'll get a crash :-(
Isn't ".buildid" a kind of subsection with the same attributes of
container section? Maybe I have BUILD_ID_EFI not defined?

Frediano