Bug 213277 - AVC denial for agetty trying to open /dev/xvc0
AVC denial for agetty trying to open /dev/xvc0
Product: Fedora
Classification: Fedora
Component: selinux-policy (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Daniel Walsh
Ben Levenson
Depends On:
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Reported: 2006-10-31 11:03 EST by Daniel Berrange
Modified: 2007-11-30 17:11 EST (History)
2 users (show)

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Fixed In Version:
Doc Type: Bug Fix
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Last Closed: 2007-02-14 10:17:03 EST
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Description Daniel Berrange 2006-10-31 11:03:52 EST
Description of problem:
With the latest kernel errata, the Xen serial console is on /dev/xvc0, and kudzu
will add a 'agetty' line to /etc/inittab to launch a login prompt on this
console. Unfortunately the agetty process is dieing with an AVC denial. It
appears the /dev/xvc0 device is not being labelled correctly - it has 'device_t'
instead of 'tty_device_t' which the regular serial devices have.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. Add 'co:2345:respawn:/sbin/agetty xvc0 9600 vt100-nav' to /etc/inittab
2. telinit q
Actual results:
No login prompt appears on /dev/xvc0,
AVC denials in logs:

audit(1162292248.586:4): avc:  denied  { getattr } for  pid=1465 comm="agetty"
name="xvc0" dev=tmpfs ino=1616 scontext=system_u:system_r:getty_t:s0
tcontext=system_u:object_r:device_t:s0 tclass=chr_file

# ls -lZ /dev/ttyS0 /dev/xvc0
crw-------  root root system_u:object_r:tty_device_t   /dev/ttyS0
crw--w----  root tty  root:object_r:device_t           /dev/xvc0

Expected results:
Login prompt appears, no AVC denials

Additional info:
Comment 1 Daniel Berrange 2006-11-05 15:44:48 EST
Temporary workaround

 # ls -lZ /dev/xvc0
 crw--w----  root tty root:object_r:device_t           /dev/xvc0
 # semanage fcontext -a -t tty_device_t -f -c /dev/xvc0
 # restorecon /dev/xvc0
 # ls -lZ /dev/xvc0
 crw--w----  root tty system_u:object_r:tty_device_t   /dev/xvc0

Be preferrable to get the policy updated for FC5 though so it 'just works' for
all users.

Comment 2 Daniel Walsh 2007-02-14 10:17:03 EST
All of these bugs should be fixed in FC6,  You could attempt to use the FC6
policy on FC5 or upgrade.  Or you could use 

audit2allow -M mypolicy -i /var/log/audit/audit.log 
and build local customized policy

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