No go from me either. Older macs may not be able to read HFS+ /boot. Also
HFS+ presents couple of problems the biggest one is that in case of sudden
reboot HFS+ often needs to be mounted by OSX or cleaning dirty flag
manually before it becomes writeable.

Le ven. 19 août 2022, 16:05, John Paul Adrian Glaubitz <
glaubitz@physik.fu-berlin.de> a écrit :

>
>
> > On Aug 19, 2022, at 3:59 PM, Daniel Kiper <dkiper@net-space.pl> wrote:
> >
> > On Fri, Aug 19, 2022 at 11:38:26PM +1000, Daniel Axtens wrote:
> >> HFS is so so very old now. According to Wikipedia, HFS was
> >> introduced in 1985 and the successor HFS+ came out in January
> >> 1998. Mac OS dropped support for writing HFS in 2009 and dropped
> >> support for reading HFS in 2019 with macOS 10.15.
> >>
> >> Grub's support for it doesn't survive contact with a fuzzer, and
> >> the issues involve some horrible mess of mutual recursion that
> >> would be time-consuming to sort out.
> >>
> >> HFS has been disabled under lockdown since commit 1c15848838d9
> >> ("fs/hfs: Disable under lockdown") which was part of an earlier
> >> spin of security fixes.
> >>
> >> I think it's time to consign HFS to the dustbin of history. It's
> >> firmly in the category of retrocomputing at this stage.
> >>
> >> This should not affect HFS+.
> >>
> >> There's a little bit of mess remaining: the macbless runtime
> >> command and HFS+ need the HFS headers for embedded volume support.
> >> I don't think that's really deployed any more, as it would have
> >> been part of the HFS->HFS+ transition, but I'm not really game to
> >> mess with either, in particular as macbless writes(!) to disk live.
> >> (I'm fairly sure the grub-macbless tool invokes code from the
> >> macbless module as well.)
> >>
> >> Signed-off-by: Daniel Axtens <dja@axtens.net>
> >
> > Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
> >
> > Daniel, thank you for preparing this patch!
> >
> > If I do not hear any major objections in the following weeks I will
> > merge this patch or a variant of it in the second half of September.
>
> We’re still formatting our /boot partitions for Debian PowerPC for
> PowerMacs using HFS, so this change would be a breaking change for us.
>
> So, that would be a no from Debian’s side.
>
> Adrian
>
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