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Not sure if I'm posting this in the correct spot, please advise if not.
Running Arch on the hardened kernel with KDE/SDDM I've found most info out there advises that SDDM is not largely compatible with Yubikey Fido2 authentication for login, specifically that the login page will not display the message to touch the key properly, but I've found it works fine.
That said, it seems there is some odd issue with a ghost login session with no tty/pty and no pid on occasion with this setup. It appears as the user you've logged in as, and at the time of login (sometimes 1 second earlier, oddly enough?)
Not sure if this is some odd artifact with the way SDDM authenticates when using a Fido2 key or what, but I'd like to figure out what the ghost login is and get rid of it as I initially thought it may be some kind of reverse shell or other external access, but from the digging I've done it appears it isn't.
Appears like this with "who":
$ who -ua
system boot 2025-05-16 19:36
user ? 2025-05-16 19:36 ? 0
user + tty1 2025-05-16 19:36 12:27 1455
user + pts/0 2025-05-16 19:36 12:26 1697 (:1)
Any thoughts on it or ideas on how I can figure out what it is if I'm wrong?
Learning Linux.. As in, I've wanted to understand the inner-workings in-depth for over a decade and just haven't done it. Digging in now and enjoying it.
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