Public bug reported:
The default /etc/bindresvport.blacklist as shipped with Kubuntu cotains its
entries (numbers) followed by a tab, and then a comment.
Apparently, the TAB causes the entries to be ignored.
We had one occurrence "in the wild" where rpc.quotad was hogging dovecot's 993
port, preventing dovecot to start up, although 993 is listed in
/etc/bindresvport.blacklist.
In order to confirm that the behavior was indeed due to the TAB, I filled up
/etc/bindresvport.blacklist for every port number from 512 til 1000, and
restarted one of the services using bindresvport (I tested with the rpc.statd
included in nfs-common), and it got a port below 1000.
After replacing the TABs with 5 spaces, it correctly got a port between 1001
and 1023.
I'm not really sure whether this is a bug in the default file (should
have spaces) or in the parser (should consider all "whitespace"
characters, including tab).
** Affects: glibc (Ubuntu)
Importance: Undecided
Status: New
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"Syntax error" in default bindresvport.blacklist
https://bugs.launchpad.net/bugs/306007
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