So here are the system logs generated by "journalctl -f" during a login
attempt: https://andrej.podzimek.org/loginjournal.txt
They capture (1) an unsuccessful authentication attempt where unix_chkpwd
cannot be used by sddm-helper (!), then (2) a quick switch to a text console
and back to sddm and finally (3) the opening of a new session for the sddm user
and getting back to the sddm console. There are SELinux glitches in (1) and (3).
As already said, disabling SELinux doesn't help, it just makes sddm hang in (1)
above. (And there are still obvious file descriptor leaks in sddm, shown by the
strace I posted earlier in this thread. It uses up all the 1024 descriptors.
You increase the limit to 16384 and it uses 16384, just like that.)
This is utterly frustrating. :-( I'd like to understand what's wrong here. Does
anyone have a working sddm that logs users into KDE 5 with SELinux enabled on
Fedora 23? If so, what log messages does it produce? Perhaps this could help me
filter out the benign messages and focus on those that matter.
Phew, problem solved!
Don't mount /etc with nosuid. :-)
Andrej
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