Even though /etc/modprobe.d/nvidia-kernel-common.conf sets the
permissions and owner to root:video 0660, the devices are created
acessible by all local users: root:root 0666.


Andreas

[CC'ed 801598 so that relevant info appears there too]

Downgraded and booted with "debug", and systemd got A LOT more
verbose :-)

But it was very useful, as digging through the log I figured out what is
loading the module. As you suspected, it's udev. More precisely, it's
this systemd unit at boot:

/lib/systemd/system/systemd-udev-trigger.service

And even more precisely, this udevadm call by that unit:

udevadm trigger --type=devices --action=add

If I remove that command from the service and reboot, the nvidia module
is still loaded and the devices are still created but with 660
root:video permissions/ownership (so Gnome oopses as expected).

So, how are we going to deal with this?

Kind regards,
Luca Boccassi

Thanks for verifying.

Can you check whether the behavior is the same if the system runs under
sysv instead of systemd?


Andreas

Ok, I'll give it a shot later tonight.

Kind regards,
Luca Boccassi

It is. The equivalent when booting with sysv is the /etc/init.d/udev
script. By commenting out the "udevadm trigger --action=add" call (line
206) the exact same happens as with systemd, the module is loaded and
the devices have permissions 660 root:video.

Kind regards,
Luca Boccassi

A proper solution will probably include patching nv-reg.h to set our
preferred defaults.


Andreas

The uploads I did today have disabled the aliases in
nvidia-modprobe.conf again to better investigate this issue without
breaking to many systems out there ...
That also means co-installation of current and legacy packages is not
working as intended because the wrong kernel module will be loaded.


Andreas

Control: severity -1 normal
since restricting this to root:video 0660 causes too much trouble.
Therefore downgrading the severity. But we would still be interested in
a working solution with more restricted permissions.


Andreas

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