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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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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).

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

https://salsa.debian.org/kernel-team/meetings/-/wikis/20260211

Regards,
Salvatore

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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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