*** This bug is a duplicate of bug 1627340 ***
https://bugs.launchpad.net/bugs/1627340
Hi,
I think this bug still occurs, at least on Debian testing (buster) with sddm
0.18.
I posted an analysis and a workaround on the following github issue, although
already closed: https://github.com/sddm/sddm/issues/637#issuecomment-453838344
tl;dr:
There is an issue in /etc/pam.d/sddm-greeter, that calls pam_mount through
'@include common-session'.
pam_mount will surely fail, as it is called for the local user sddm, which has
probably no access right to the given shared volume.
What is not normal, maybe, is that sddm will then catch a SIGTERM and so will
terminate.
The same kind of pam_mount failures occurs with /etc/pam.d/login (eg with user
root), and login can proceed correctly.
Why is this a blocking issue when processed by /etc/pam.d/sddm-greeter?
I could imagine the following solutions:
- modify the /etc/pam.d/sddm-greeter file, either by:
- replacing the '@include common-session' statement by the actual
directives in /etc/pam.d/common-session, EXCEPT the one with pam_mount. This is
the workaround proposed by another user on github. It works, but I don't find
it very clean, to be honest.
- replacing the '@include common-session' statement with a substack, with
some conditions? I'm not an expert with PAM, I don't know if this is even
feasible?
- do not terminate on a SIGTERM send by pam_mount? Is it feasible, too?
- apply the workaround I propose: use the pam_mount extended user control
features, to exclude the sddm user from trying to mount the volume. We can
explicitly exclude this user, or a whole range (all local users for example).
Hope you will find this useful !
Cheers
** Bug watch added: github.com/sddm/sddm/issues #637
https://github.com/sddm/sddm/issues/637
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1624268
Title:
pam_mount crashes SDDM because helper doesn't close session after
authentication
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/sddm/+bug/1624268/+subscriptions
--
ubuntu-bugs mailing list
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
