[Pkg-cups-devel] Bug#516945: cups: Serial backend permissions problem

[Tim Allen]

Package: cups
Version: 1.3.8-1lenny4.1
Severity: normal

*** Please type your report below this line ***
Fresh install of Lenny, serial printer added with

lpadmin -p DEC-LA100 -v 
serial:/dev/ttyS0?baud=9600+size=8+parity=none+flow=hard -D "DEC 
Letterprinter 100" -P textonly.ppd

Print fails with

E [24/Feb/2009:08:18:48 +0000] PID 4993 (/usr/lib/cups/backend/serial) 
stopped with status 22!

in log.

# ls -l /dev/ttyS?
crw-rw---- 1 root dialout 4, 64 2009-02-24 15:36 /dev/ttyS0
crw-rw---- 1 root dialout 4, 65 2009-02-24 16:09 /dev/ttyS1
crw-rw---- 1 root dialout 4, 66 2009-02-24 14:15 /dev/ttyS2
crw-rw---- 1 root dialout 4, 67 2009-02-24 14:15 /dev/ttyS3

Restarting cups after each change:

chown root.lp /dev/ttyS0
  -does not fix.

chmod 666 /dev/ttyS0
  -does not fix.

Return /dev/ttyS0 to original permissions/ownership.

# ls -l /usr/lib/cups/backend/serial
-rwxr--r-- 2 root root 14900 2009-01-13 16:53 /usr/lib/cups/backend/serial

(Received theory being serial should run as root with 744, or 700, 
permissions)

chmod 700 /usr/lib/cups/backend/serial

  -fixes problem.

Note permissions of serial in /usr/lib/cups/backend-available are 700.


-- System Information:
Debian Release: 5.0
   APT prefers stable
   APT policy: (500, 'stable')
Architecture: i386 (i586)

Kernel: Linux 2.6.26-1-486
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages cups depends on:
ii  adduser            3.110                 add and remove users and groups
ii  cups-common        1.3.8-1lenny4.1       Common UNIX Printing 
System(tm) -
ii  debconf [debconf-2 1.5.24                Debian configuration 
management sy
ii  ghostscript        8.62.dfsg.1-3.2lenny0 The GPL Ghostscript 
PostScript/PDF
ii  libavahi-compat-li 0.6.23-3lenny1        Avahi Apple Bonjour 
compatibility
ii  libc6              2.7-18                GNU C Library: Shared libraries
ii  libcups2           1.3.8-1lenny4.1       Common UNIX Printing 
System(tm) -
ii  libcupsimage2      1.3.8-1lenny4.1       Common UNIX Printing 
System(tm) -
ii  libdbus-1-3        1.2.1-5               simple interprocess 
messaging syst
ii  libgnutls26        2.4.2-6               the GNU TLS library - 
runtime libr
ii  libkrb53           1.6.dfsg.4~beta1-5    MIT Kerberos runtime libraries
ii  libldap-2.4-2      2.4.11-1              OpenLDAP libraries
ii  libpam0g           1.0.1-5               Pluggable Authentication 
Modules l
ii  libpaper1          1.1.23+nmu1           library for handling paper 
charact
ii  libslp1            1.2.1-7.5             OpenSLP libraries
ii  lsb-base           3.2-20                Linux Standard Base 3.2 
init scrip
ii  perl-modules       5.10.0-19             Core Perl modules
ii  poppler-utils [xpd 0.8.7-1               PDF utilitites (based on 
libpopple
ii  procps             1:3.2.7-11            /proc file system utilities
ii  ssl-cert           1.0.23                simple debconf wrapper for 
OpenSSL

Versions of packages cups recommends:
ii  avahi-utils           0.6.23-3lenny1     Avahi browsing, publishing 
and dis
ii  cups-client           1.3.8-1lenny4.1    Common UNIX Printing 
System(tm) -
ii  foomatic-filters      3.0.2-20080211-3.2 OpenPrinting printer 
support - fil
ii  smbclient             2:3.2.5-4          a LanManager-like simple 
client fo

Versions of packages cups suggests:
ii  cups-bsd                1.3.8-1lenny4.1  Common UNIX Printing 
System(tm) -
pn  cups-driver-gutenprint  <none>           (no description available)
pn  cups-pdf                <none>           (no description available)
ii  foomatic-db             20080211-2+nmu1  OpenPrinting printer 
support - dat
ii  foomatic-db-engine      3.0.2-20080211-1 OpenPrinting printer 
support - pro
pn  hplip                   <none>           (no description available)
pn  xpdf-korean | xpdf-japa <none>           (no description available)

-- debconf information:
   cupsys/raw-print: true
   cupsys/backend: ipp, lpd, parallel, scsi, serial, socket, usb, snmp, 
dnssd