Re: F38 proposal: Unified Kernel Support Phase 1 (System-Wide Change proposal)

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On 12/21/22 12:00, Lennart Poettering wrote:
> On Mi, 21.12.22 10:03, Gerd Hoffmann (kraxel@xxxxxxxxxx) wrote:
> 
>> For the general case we need some other option.  Could be just stick to
>> grub2 for those cases (we'll continue to need grub2 anyway for bios boot
>> and ppc64le).  Or drop an ext4 driver to /boot/efi/EFI/systemd/drivers,
>> for example this one:
>>   https://github.com/tianocore/edk2-platforms/tree/master/Features/Ext4Pkg
> 
> I am pretty strongly against the idea of ext4 for /boot/.
> 
> First of all, the firmware can't read it natively, but what's worse,
> uefi cannot even make sense of any of the features it provides above
> vfat. i.e. file ownership, access modes, ACLs, selinux labels, xattrs,
> symlinks, … are all complete nonsense to the UEFI fs layer (and to
> boot loaders that natively implement the fs drivers, the same). The
> UEFI fs API has no concepts for *any* of these features. Hence, if
> this is supposed to carry data intended for consumption by the boot
> loader, why the f**k would you use a file system it cannot even
> remotely take benefit of?
> 
> Also, I am pretty sure boot loaders should have the ability to make
> changes to the file systems they read UKIs from, to implement boot
> counting and random seed management. grub fs drivers and the stuff
> derived thereof (i.e. efifs stuff) typically is read-only though.
> 
> At least for the systemd stuff, we carefully made sure that our access
> patterns to the ESP both from sd-boot/sd-stub and from userspace are
> by default as minimal and robust as we can make them, to minimize
> chance of corruption, given that vfat is not particularly good with
> that. (i.e. we sync a lot, and the whole ESP mount is by default an
> autofs instance with an extremely short idle timeout so that it
> basically remains unmounted — and thus — clean during almost all
> times).
> 
> Anyway, if you want to know more about choice of the fs for /boot/,
> see my ideas here:
> 
> https://0pointer.net/blog/linux-boot-partitions.html
> 
> Lennart

Does vfat support atomic rename?  Is it possible to atomically upgrade
a bootloader/UKI/etc?
-- 
Sincerely,
Demi Marie Obenour (she/her/hers)
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