[nylug-talk] Ubuntu: Not Connected? Printer may not be connected

[Chris Knadle]

On Tuesday 01 January 2008, pachai1 at optonline.net wrote:
> Sample messages below.
> permissions on /dev/tty are   crw-rw-rw- 1 root root

   Hmm.  Device major number 5, minor number 0.  I *think* that might just be 
stdin -- I.E. standard input.

> Google seems to suggest dropping and re-adding the usb printer.

   Yes, that would be a good thing to try.

> [100792.140000] ppdev0: registered pardevice
> [100792.140000] ppdev0: unregistered pardevice
> [100792.752000] ppdev0: registered pardevice
> [100792.800000] ppdev0: unregistered pardevice

   Looks like a parallel port driver -- probably a red herring.

> [100792.904000]
> /build/buildd/linux-source-2.6.22-2.6.22/drivers/usb/class/usblp.c: usblp0:
> removed [106913.976000] audit(1199162454.259:24):  type=1503
> operation="inode_permission" requested_mask="rw" denied_mask="rw"
> name="/dev/tty" pid=10268 profile="/usr/sbin/cupsd" [106913.992000]
> audit(1199162454.259:25):  type=1503 operation="inode_permission"
> requested_mask="rw" denied_mask="rw" name="/dev/tty" pid=10271
> profile="/usr/sbin/cupsd"
>
> [135563.240000] audit(1199191103.809:26):  type=1503
> operation="inode_permission" requested_mask="rw" denied_mask="rw"
> name="/dev/tty" pid=13004 profile="/usr/sbin/cupsd" [135563.288000]
> audit(1199191103.809:27):  type=1503 operation="inode_permission"
> requested_mask="rw" denied_mask="rw" name="/dev/tty" pid=13007
> profile="/usr/sbin/cupsd"

   I think these are audit error messages related to something like SELinux.  
Looks to me like a security policy *might* be denying cupsd from opening 
stdin.

   Are you by chance actively using an SELinux policy?  If this is Ubuntu then 
this policy might only be *reporting* what SELinux *would* deny if it were 
really active, rather than *actually* denying it.  By default the SELinux 
targeted policy that comes with Debian + Ubuntu I believe works that way, and 
if so, these messages are again just another red herring -- but I can't tell 
for sure.

   -- Chris

-- 

Chris Knadle
Chris.Knadle at coredump.us