[Expired for cups (Ubuntu) because there has been no activity for 60
days.]
** Changed in: cups (Ubuntu)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/674246
Title:
printers.conf integrity problems
Status in cups package in Ubuntu:
Expired
Bug description:
Binary package hint: cups
1.4.3-1ubuntu1.3
On multiple occasions, I have witnessed a machine under heavy load
experience a corrupted printers.conf file. In at least one instance,
the file was partially truncated leading to the loss of approximately
half of the printers. In another instance, printers.conf went missing
entirely, leaving only printers.conf.O behind. An example log from
the latter event is as follows...
I [09/Nov/2010:10:06:38 +0000] Saving printers.conf...
I [09/Nov/2010:10:06:38 +0000] Saving job cache file
"/var/cache/cups/job.cache"...
I [09/Nov/2010:10:06:38 +0000] Saving subscriptions.conf...
I [09/Nov/2010:10:07:08 +0000] Saving printers.conf...
I [09/Nov/2010:10:07:08 +0000] Saving subscriptions.conf...
I [09/Nov/2010:10:07:38 +0000] Saving printers.conf...
I [09/Nov/2010:10:07:38 +0000] Saving job cache file
"/var/cache/cups/job.cache"...
I [09/Nov/2010:10:07:38 +0000] Saving subscriptions.conf...
I [09/Nov/2010:10:08:08 +0000] Saving printers.conf...
I [09/Nov/2010:10:08:08 +0000] Saving job cache file
"/var/cache/cups/job.cache"...
I [09/Nov/2010:10:08:08 +0000] Saving subscriptions.conf...
W [09/Nov/2010:10:08:20 +0000] Possible DoS attack - more than 10 clients
connecting from !
I [09/Nov/2010:10:08:38 +0000] Saving printers.conf...
I [09/Nov/2010:10:08:38 +0000] Saving job cache file
"/var/cache/cups/job.cache"...
I [09/Nov/2010:10:08:38 +0000] Saving subscriptions.conf...
I [09/Nov/2010:10:09:08 +0000] Saving printers.conf...
I [09/Nov/2010:10:09:08 +0000] Saving job cache file
"/var/cache/cups/job.cache"...
I [09/Nov/2010:10:09:08 +0000] Saving subscriptions.conf...
W [09/Nov/2010:10:09:24 +0000] Possible DoS attack - more than 10 clients
connecting from !
I [09/Nov/2010:10:09:39 +0000] Saving printers.conf...
I [09/Nov/2010:10:09:39 +0000] Saving job cache file
"/var/cache/cups/job.cache"...
I [09/Nov/2010:10:09:39 +0000] Saving subscriptions.conf...
E [09/Nov/2010:10:09:43 +0000] Unable to encrypt connection from XXXX - A TLS
packet with unexpected length was received.
I [09/Nov/2010:10:10:00 +0000] Scheduler shutting down normally.
I [09/Nov/2010:10:11:09 +0000] Listening to 0.0.0.0:631 (IPv4)
I [09/Nov/2010:10:11:09 +0000] Listening to /var/run/cups/cups.sock (Domain)
I [09/Nov/2010:10:11:09 +0000] Listening to 0.0.0.0:443 (IPv4)
W [09/Nov/2010:10:11:09 +0000] No limit for CUPS-Get-Document defined in
policy default - using Send-Document's policy
I [09/Nov/2010:10:11:09 +0000] Remote access is enabled.
I [09/Nov/2010:10:11:09 +0000] Loaded configuration file
"/etc/cups/cupsd.conf"
I [09/Nov/2010:10:11:09 +0000] Using default TempDir of /var/spool/cups/tmp...
I [09/Nov/2010:10:11:09 +0000] MaxClients limited to 1/3 (341) of the file
descriptor limit (1024)...
I [09/Nov/2010:10:11:09 +0000] Configured for up to 341 clients.
I [09/Nov/2010:10:11:09 +0000] Allowing up to 10 client connections per host.
I [09/Nov/2010:10:11:09 +0000] Using policy "default" as the default!
I [09/Nov/2010:10:11:09 +0000] Full reload is required.
I [09/Nov/2010:10:11:09 +0000] Loaded MIME database from
"/usr/share/cups/mime" and "/etc/cups": 37 types, 73 filters...
I [09/Nov/2010:10:11:09 +0000] Loading job cache file
"/var/cache/cups/job.cache"...
E [09/Nov/2010:10:11:09 +0000] [Job 4985] Unable to queue job for destination
"leadpipe"!
I [09/Nov/2010:10:11:09 +0000] Full reload complete.
I [09/Nov/2010:10:11:09 +0000] Cleaning out old temporary files in
"/var/spool/cups/tmp"...
E [09/Nov/2010:10:11:09 +0000] Unable to remove temporary file
"/var/spool/cups/tmp/.fontconfig" - Is a directory
I [09/Nov/2010:10:11:09 +0000] Listening to 0.0.0.0:631 on fd 6...
I [09/Nov/2010:10:11:09 +0000] Listening to /var/run/cups/cups.sock on fd 7...
I [09/Nov/2010:10:11:09 +0000] Listening to 0.0.0.0:443 on fd 8...
I [09/Nov/2010:10:11:09 +0000] Resuming new connection processing...
E [09/Nov/2010:10:23:11 +0000] Unable to encrypt connection from XXXX - A TLS
packet with unexpected length was received.
10:09:39 is the last time printers.conf is saved
10:10:00 scheduler shuts down (cause never seems to be mentioned for shut
downs)
10:11:09 server back up, now missing printers (Unable to queue job for
destination "leadpipe"!)
Somewhere in this mess the printers.conf was removed or renamed and
never replaced. Cups came back up with nil printers (which also leads
to samba removing its record of the printers as well). The only
possible culprit I can make out from the logs is "Possible DoS attack
- more than 10 clients connecting from !" to configure it, as the
cupsd.conf makes no apparent mention of it.
This all leads me to believe that whatever process is used to
continually re-write the printers.conf file is not acting in a
suitably atomic fashion. Ideally there should be some mechanism in
place to ensure that the integrity of the file will remain intact
during updates, even if interrupted.
Issue reported to cups: http://cups.org/str.php?L3715
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