[Bug 3799] Slow login with PAM enabled when connecting to sshd socket listening on Guest Vsock

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3799

xenia <xenia at ccs.neu.edu> changed:

           What    |Removed                     |Added
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                 CC|                            |xenia at ccs.neu.edu

--- Comment #1 from xenia <xenia at ccs.neu.edu> ---
As far as I can tell, the root cause of this is that sshd sets
PAM_RHOST to "UNKNOWN" (literal string) when the socket is non-TCP/IP,
and then PAM tries to do a DNS lookup for "UNKNOWN" several times. This
seems like a genuine sshd bug to me. It should not be sending an
invalid hostname to pam via PAM_RHOST if it doesn't actually know the
remote hostname. I can try to write up a patch if there's interest.
(Otherwise, I resolved this issue currently with a hack -- if there's
an entry for "UNKNOWN" in /etc/hosts everything is fine and there are
no delays)

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