AlainKnaff's comment #3 is entirely correct. This bug is also easy to
reproduce, as described in the initial comment, although as noted in
comment #3, it is not tabs per se that are the problem: anything other
than '#' or end-of-line is a problem.
I encountered this with ypbind taking the port 631 of cups, causing
printing in GNOME to be disabled.
Most casual users will not report this bug because it will "go away on
its own" if they reboot or something--but that is not the attitude to
encourage.
Just to be completely specific about how to reproduce this (this was
with 8.04, but I don't have any reason to believe it's been fixed):
0. Backup the file:
$ sudo mv /etc/bindresvport.blacklist /etc/bindresvport.blacklist.bak
1. Reserve all ports 600-999, with the format used for shipped
bindresvport.blacklist (e.g., "631\t# cups")
$ perl -e 'for ($i=600; $i<1000; $i++) {print "$i\t# foo\n";}' | sudo dd
of=/etc/bindresvport.blacklist
7+1 records in
7+1 records out
4011 bytes (4.0 kB) copied, 6.5962e-05 s, 60.8 MB/s
2. Restart nis (or a different service as available).
$ sudo /etc/init.d/nis restart
* Starting NIS service
3. Check what port it got:
$ sudo netstat --inet -nap | grep ypbind
tcp 0 0 0.0.0.0:724 0.0.0.0:* LISTEN
29803/ypbind
udp 0 0 0.0.0.0:723 0.0.0.0:*
29803/ypbind
udp 0 0 0.0.0.0:724 0.0.0.0:*
29803/ypbind
4. Note that it falls in the range 600-999 (there is a small 24 out of
424 chance it will not -- try again).
This also fails with spaces, substituting the perl command in step 1:
$ perl -e 'for ($i=600; $i<1000; $i++) {print "$i # foo\n";}' | sudo dd
of=/etc/bindresvport.blacklist
It works with the '#' character directly following the port number:
$ perl -e 'for ($i=600; $i<1000; $i++) {print "$i# foo\n";}' | sudo dd
of=/etc/bindresvport.blacklist
or with the port number on the line by itself:
$ perl -e 'for ($i=600; $i<1000; $i++) {print "$i\n";}' | sudo dd
of=/etc/bindresvport.blacklist
In the last two cases I get:
tcp 0 0 0.0.0.0:1001 0.0.0.0:* LISTEN
29923/ypbind
udp 0 0 0.0.0.0:1000 0.0.0.0:*
29923/ypbind
udp 0 0 0.0.0.0:1001 0.0.0.0:*
29923/ypbind
The comment #3 also describes the fix.
** Changed in: glibc (Ubuntu)
Status: Incomplete => New
--
"Syntax error" in default bindresvport.blacklist
https://bugs.launchpad.net/bugs/306007
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