On 02/18/2016 07:30 AM, Miroslav Grepl wrote:
On 02/17/2016 06:45 PM, Robert Nichols wrote:
On 02/15/2016 12:25 PM, Robert Nichols wrote:
On 02/15/2016 10:03 AM, Miroslav Grepl wrote:
On 02/14/2016 01:43 AM, Robert Nichols wrote:
In CentOS 6.7 with Windows 7 running in a QEMU/KVM virtual machine,
when I power-on a printer that the Windows VM uses via networking
I get the below AVC alert. Anyone have any idea what is going on?
I haven't noticed anything not working.
Is it a USB printer?
The host is using a USB connection with CUPS. The printer also has a
network interface, and I let Windows machines (both real and VM) use
it directly via the network rather than setting up Samba print sharing.
I find I get this alert even on a fresh boot of the host with no VMs
and no virt-manager running. Only the libvirtd service is running.
Looking up the reported inode number, I find /dev/bus/usb/003/002:
Could you open a new bug against libvirt? It should be relabaled back to
the default label if there are no running VMs.
It turns out that's not the issue. I must have been mistaken when I said
the AVC denial occurred with no VMs running. I only see the problem when
a VM _is_ running. The USB device is not a printer, but a USB sound
device that I use with VMs because I've never been able to sound
passthrough to the hosts pulseaudio working. It appears that udev-
configure-printer tries to examine all USB devices when I turn on a
printer, and I get the SELinux denials for any USB device that is in
use by a VM. I'm reluctant to DONTAUDIT this out of fear that one day
it will be hiding something I would need to see to identify a problem,
but it looks like that's my only choice other than mentally ignoring
the alerts.
Actually, any pointers to getting audio passthrough to the hosts
pulseaudio from a QEMU/KVM VM using a Spice connection would be
appreciated. The pulseaudio developers are strongly opposed to
letting anything except the current X session use the audio.
# ls -Z /dev/bus/usb/003/002
crw-rw-r--. qemu qemu system_u:object_r:svirt_image_t:s0:c68,c582
/dev/bus/usb/003/002
# lsof /dev/bus/usb/003/002
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
qemu-kvm 4370 qemu 28u CHR 189,257 0t271 10937 /dev/bus/usb/003/002
If there are no other suggestions, I'm going to DONTAUDIT this to get
it out of my hair.
SELinux is preventing /lib/udev/udev-configure-printer from read access
on the chr_file 003.
***** Plugin catchall (100. confidence) suggests
***************************
If you believe that udev-configure-printer should be allowed read
access
on the 003 chr_file by default.
Then you should report this as a bug.
You can generate a local policy module to allow this access.
Do
allow this access for now by executing:
# grep udev-configure- /var/log/audit/audit.log | audit2allow -M mypol
# semodule -i mypol.pp
Additional Information:
Source Context system_u:system_r:cupsd_config_t:s0-s0:c0.c1023
Target Context
system_u:object_r:svirt_image_t:s0:c255,c554
Target Objects 003 [ chr_file ]
Source udev-configure-
Source Path /lib/udev/udev-configure-printer
Port <Unknown>
Host omega-3g.local
Source RPM Packages system-config-printer-udev-1.1.16-25.el6.x86_64
Target RPM Packages
Policy RPM selinux-policy-3.7.19-279.el6_7.8.noarch
Selinux Enabled True
Policy Type targeted
Enforcing Mode Enforcing
Host Name omega-3g.local
Platform Linux omega-3g.local
3.18.21-16.el6.x86_64
#1 SMP
Sat Sep 26 01:24:19 UTC 2015 x86_64
x86_64
Alert Count 1
First Seen Sat 13 Feb 2016 06:18:29 PM CST
Last Seen Sat 13 Feb 2016 06:18:29 PM CST
Local ID c3c9d30e-0835-4402-b342-acddd26e1686
Raw Audit Messages
type=AVC msg=audit(1455409109.607:29449): avc: denied { read } for
pid=32326 comm="udev-configure-" name="003" dev="devtmpfs" ino=2706
scontext=system_u:system_r:cupsd_config_t:s0-s0:c0.c1023
tcontext=system_u:object_r:svirt_image_t:s0:c255,c554 tclass=chr_file
permissive=0
type=SYSCALL msg=audit(1455409109.607:29449): arch=x86_64 syscall=open
success=no exit=EACCES a0=7ffe1bd16eb0 a1=0 a2=d a3=0 items=0 ppid=1
pid=32326 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0
sgid=0 fsgid=0 tty=(none) ses=4294967295 comm=udev-configure-
exe=/lib/udev/udev-configure-printer
subj=system_u:system_r:cupsd_config_t:s0-s0:c0.c1023 key=(null)
Hash: udev-configure-,cupsd_config_t,svirt_image_t,chr_file,read
--
Bob Nichols "NOSPAM" is really part of my email address.
Do NOT delete it.
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