Re: EFI File renaming

[Traut Manuel LCPF-CH <Manuel.Traut@mt.com>]

Hi Ilias,

On Tue, Nov 12, 2024 at 03:46:48PM +0200, Ilias Apalodimas wrote:
> Hello Manuel,
> 
> On Tue, 12 Nov 2024 at 15:21, Traut Manuel LCPF-CH <Manuel.Traut@mt.com> wrote:
> >
> > Hi,
> >
> > systemd-boot counting logic requires [0] to be implemented.
> >
> > Is anybody already working on this?
> 
> I am not aware of any patches

thanks for the quick response.

> > If not we plan to add the functionality in fs/fs.c and fs/fat - correct?
> 
> We don't have plans for it, but explaining any use cases you have might help

systemd-boot is able to do bootcounting by renaming the UKI image [0]
the code that triggers the not implemented code section is here [1].

With this it is possible to have watchdog based A/B switching on systems
without a writeable u-boot environment. And therefore it is a nice
method to implement measured boot.

Regards
Manuel

[0] https://uapi-group.org/specifications/specs/boot_loader_specification/#boot-counting
[1] https://github.com/systemd/systemd/blob/3304a029b847e87da51f7a8ad8c118111508e009/src/boot/boot.c#L1407

> Cheers
> /Ilias
> >
> > Cheers
> > Manuel
> >
> > [0] https://elixir.bootlin.com/u-boot/v2025.01-rc1/source/lib/efi_loader/efi_file.c#L971