Your message dated Thu, 11 May 2006 17:56:05 +0200
with message-id <[EMAIL PROTECTED]>
and subject line Bug#366845: libsane: Only root can use canon_pp backend
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--- Begin Message ---
Package: libsane
Version: 1.0.17-3
Severity: normal
I've been trying to use my Canon N640P. It works very well when I run
as root, but when I run as my normal user, sane can't find the scanner.
When I run scanimage -L as root, I see:
device `canon_pp:parport0' is a CANON N640P flatbed scanner
As normal user, I get:
No scanners were identified. If you were expecting something different,
check that the scanner is plugged in, turned on and detected by the
sane-find-scanner tool (if appropriate). Please read the documentation
which came with this software (README, FAQ, manpages).
I think that it has something to do with the permissions on /dev/port
that libieee1284-3 uses.
$ ls -l /dev/port
crw-rw---- 1 root scanner 1, 4 2006-05-11 08:16 /dev/port
I've changed these permissions to the above in
/etc/udev/permissions.rules, and I am a member of the scanner group.
Here's an extract of an strace -L as normal uses:
open("/dev/parport0", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/parports/0", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/parport1", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/parports/1", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/parport2", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/parports/2", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/parport3", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/parports/3", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/parport4", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/parports/4", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/parport5", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/parports/5", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/parport6", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/parports/6", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/parport7", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/parports/7", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
ioperm(0x378, 0x3, 0x1) = -1 EPERM (Operation not
permitted)
open("/dev/port", O_RDWR|O_NOCTTY) = -1 EPERM (Operation not
permitted)
open("/dev/lp0", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/lp1", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/lp2", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
And here's a similar extract as root.
open("/dev/parports/1", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/parport2", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/parports/2", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/parport3", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/parports/3", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/parport4", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/parports/4", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/parport5", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/parports/5", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/parport6", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/parports/6", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/parport7", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/parports/7", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
ioperm(0x378, 0x3, 0x1) = 0
ioperm(0x378, 0x3, 0) = 0
open("/dev/port", O_RDWR|O_NOCTTY) = 3
close(3) = 0
open("/dev/lp0", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/lp1", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
open("/dev/lp2", O_RDONLY|O_NOCTTY) = -1 ENOENT (No such file or
directory)
As you can see, root happily opens /dev/port, but normal user doesn't.
Doh.
That's about all of the useful info that I can think of.
-- System Information:
Debian Release: testing/unstable
APT prefers testing
APT policy: (650, 'testing')
Architecture: i386 (i686)
Shell: /bin/sh linked to /bin/bash
Kernel: Linux 2.6.16.9
Locale: LANG=en_CA, LC_CTYPE=en_CA (charmap=ISO-8859-1)
Versions of packages libsane depends on:
ii adduser 3.87 Add and remove users and groups
ii libc6 2.3.6-7 GNU C Library: Shared libraries
ii libgphoto2-2 2.1.6-8 gphoto2 digital camera library
ii libgphoto2-port0 2.1.6-8 gphoto2 digital camera port librar
ii libieee1284-3 0.2.10-1 cross-platform library for paralle
ii libjpeg62 6b-12 The Independent JPEG Group's JPEG
ii libusb-0.1-4 2:0.1.12-2 userspace USB programming library
ii makedev 2.3.1-81 creates device files in /dev
Versions of packages libsane recommends:
ii module-init-tools 3.2.2-2 tools for managing Linux kernel mo
ii sane-utils 1.0.17-3 API library for scanners -- utilit
ii udev [hotplug] 0.091-2 /dev/ and hotplug management daemo
-- no debconf information
--- End Message ---
--- Begin Message ---
Mark Small <[EMAIL PROTECTED]> wrote:
Hi,
> As you can see, root happily opens /dev/port, but normal user doesn't.
> Doh.
And this is the intended behaviour. Only root can perform low-level I/O.
Load the parport_pc module, create /dev/parport0 (though udev should
do it for you) and try again, applying proper permissions on
/dev/parport0.
Above all, RESTORE THE PREVIOUS PERMISSIONS ON /DEV/PORT. You just
opened a security hole.
JB.
--
Julien BLACHE - Debian & GNU/Linux Developer - <[EMAIL PROTECTED]>
Public key available on <http://www.jblache.org> - KeyID: F5D6 5169
GPG Fingerprint : 935A 79F1 C8B3 3521 FD62 7CC7 CD61 4FD7 F5D6 5169
--- End Message ---
