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Bug#1127659: linux-image-6.12.69+deb13-rt-amd64: chrony 4.6.1 cannot configure extpps for PHC refclocks due to new permission check

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Hi Salvatore,

Le 2026-02-12 16:14, Salvatore Bonaccorso a écrit :
> Control: affects -1 - chrony
> Control: reassign -1 src:chrony 4.6.1-3
> Control: found -1 4.3-2+deb12u1
> Control: found -1 4.3-2
> Control: fixed -1 4.8-1
> Control: tags -1 + upstream fixed-upstream bookworm trixie
> 
> Hi Jan,
> 
> On Wed, Feb 11, 2026 at 11:40:12AM +0100, Jan Luebbe wrote:
> > Package: src:linux
> > Version: 6.12.69-1
> > Severity: important
> > Tags: upstream
> > X-Debbugs-Cc: jlu@pengutronix.de
> > 
> > Dear Maintainer,
> > 
> > I've just debugged a new issue with 6.12.69+deb13 vs. 6.12.63+deb13.
> > chrony 4.6.1 (the version in Debian stable) started failing to start
> > with "Fatal error : Could not enable external PHC timestamping".
> > 
> > We use the extpps mode with PTP hardware clocks. It seems that
> > https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=97529630d85f910f4e6dfc615f1d111ada9448e3
> > changes /dev/ptp* to now require FDs open for writing to configure
> > extpps. Chrony has a fix
> > (https://gitlab.com/chrony/chrony/-/commit/f78e4681eff71d941fab3be5ee406d920a155a20),
> > but that's only in the version in testing/sid.
> 
> We talked about this bug on yesterdays team meeting, and it was
> commented as the kernel change is a security fix, it likely won't be
> reverted and the fix should be backported for chrony to the affected
> releases and schedule fixes via the point releases (with ideally the
> option to make an update as well make it as a SUA to get earlier to
> users affected by the issue).

Fair!
 
> Would you be willing to work on those backports and propose the point
> release updates?

I will handle this. I will provide a build for Jan to test because I do
not have that kind of setup at hand.
 
> https://salsa.debian.org/kernel-team/meetings/-/wikis/20260211
> 
> Regards,
> Salvatore
 
Cheers,
Vincent

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Bug#1127659: linux-image-6.12.69+deb13-rt-amd64: chrony 4.6.1 cannot configure extpps for PHC refclocks due to new permission check Jan Luebbe <jlu@pengutronix.de> - 2026-02-11 11:50 +0100
  Bug#1127659: linux-image-6.12.69+deb13-rt-amd64: chrony 4.6.1 cannot configure extpps for PHC refclocks due to new permission check Salvatore Bonaccorso <carnil@debian.org> - 2026-02-12 16:20 +0100
    Bug#1127659: linux-image-6.12.69+deb13-rt-amd64: chrony 4.6.1 cannot configure extpps for PHC refclocks due to new permission check Vincent Blut <vincent.debian@free.fr> - 2026-02-12 16:40 +0100
  Processed: Re: Bug#1127659: linux-image-6.12.69+deb13-rt-amd64:  chrony 4.6.1 cannot configure extpps for PHC refclocks due to new  permission check "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-02-12 16:20 +0100

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