[libvirt-users] LXC + USB passthrough = Operation not permitted

Thu Apr 17 00:11:26 UTC 2014

Further followups!

We are correlating DEBUG-level output from libvirt with the libvirt 1.2.2
code to try to figure out what libvirt is doing under the hood.

Even though we have the log level set to 1 (info) in our libvirtd.conf, we
are not seeing the VIR_DEBUG() [1] statements being printed out. There are
tons of other presumably-debug lines of output showing up in our log. We
are sort of expecting to see the output from [1] in our logs somewhere,
given the type of usb mounting we are trying to do?

[1]
http://libvirt.org/git/?p=libvirt.git;a=blob;f=src/lxc/lxc_controller.c;h=c05dfec6428cad927cd5751004a4f3afc67899de;hb=HEAD#l1396

On Wed, Apr 16, 2014 at 3:58 PM, Filip Maj <fil at saucelabs.com> wrote:

> To follow up on this a little bit, tail'ing kern.log while trying to get
> our little container up doesn't yield anything with apparmor complaining,
> so, unless I'm looking in the wrong spots for apparmor logs (which I don't
> think so, as I see other apparmor-related log entries in kern.log), I am
> not entirely sure this is an apparmor issue at this point.
>
>
> On Wed, Apr 16, 2014 at 3:25 PM, Filip Maj <fil at saucelabs.com> wrote:
>
>> Yeah, AppArmor is enabled, but I put everything (that I could find) into
>> complain mode:
>>
>> $ sudo apparmor_status
>> apparmor module is loaded.
>> 12 profiles are loaded.
>> 3 profiles are in enforce mode.
>>    lxc-container-default
>>    lxc-container-default-with-mounting
>>    lxc-container-default-with-nesting
>> 9 profiles are in complain mode.
>>    /sbin/dhclient
>>    /usr/bin/lxc-start
>>    /usr/lib/NetworkManager/nm-dhcp-client.action
>>    /usr/lib/connman/scripts/dhclient-script
>>    /usr/lib/libvirt/virt-aa-helper
>>    /usr/sbin/libvirtd
>>    /usr/sbin/ntpd
>>    /usr/sbin/rsyslogd
>>    /usr/sbin/tcpdump
>> 3 processes have profiles defined.
>> 0 processes are in enforce mode.
>> 2 processes are in complain mode.
>>    /usr/sbin/libvirtd (30419)
>>    /usr/sbin/ntpd (3418)
>> 1 processes are unconfined but have a profile defined.
>>    /usr/sbin/rsyslogd (626)
>>
>> And still get issues. From libvirtd.log:
>>
>> 2014-04-16 22:19:10.855+0000: 30419: info : libvirt version: 1.2.2
>> 2014-04-16 22:19:10.855+0000: 30419: error : virNetSocketReadWire:1446 :
>> Cannot recv data: Connection reset by peer
>> 2014-04-16 22:19:10.940+0000: 30420: error : virLXCProcessStart:1299 :
>> internal error: guest failed to start: Unable to create device
>> //var/run/libvirt/lxc/oshi32134.dev/bus/usb//002//003: Operation not
>> permitted
>>
>> 2014-04-16 22:19:10.964+0000: 30420: warning :
>> virLXCDomainReAttachHostUsbDevices:388 : Unable to find device 000.000 in
>> list of active USB devices
>>
>> Thanks in advance for any help, Daniel!
>>
>> Cheers,
>> Fil
>>
>>
>> On Tue, Apr 15, 2014 at 1:33 AM, Daniel P. Berrange <berrange at redhat.com>wrote:
>>
>>> On Fri, Apr 11, 2014 at 05:32:28PM -0700, Filip Maj wrote:
>>> > Hi!
>>> >
>>> > First post, kind of a noobie. I've been working with LXC and libvirt
>>> for a
>>> > few months now. Trying to do some interesting things with containers
>>> and
>>> > Android devices :D
>>> > Here's my entire domain definition:
>>> >
>>> > <domain type='lxc'>
>>> >   <name>oshi32134</name>
>>> >   <uuid>xxxxx</uuid>
>>> >   <memory unit='KiB'>3145728</memory>
>>> >   <currentMemory unit='KiB'>3145728</currentMemory>
>>> >   <vcpu placement='static'>1</vcpu>
>>> >   <resource>
>>> >     <partition>/machine</partition>
>>> >   </resource>
>>> >   <os>
>>> >     <type arch='i686'>exe</type>
>>> >     <init>/sbin/init</init>
>>> >   </os>
>>> >   <clock offset='utc'/>
>>> >   <on_poweroff>destroy</on_poweroff>
>>> >   <on_reboot>restart</on_reboot>
>>> >   <on_crash>destroy</on_crash>
>>> >   <devices>
>>> >     <emulator>/usr/lib/libvirt/libvirt_lxc</emulator>
>>> >     <filesystem type='mount' accessmode='passthrough'>
>>> >       <source dir='/some/valid/filesystem/location'/>
>>> >       <target dir='/'/>
>>> >     </filesystem>
>>> >     <filesystem type='mount' accessmode='passthrough'>
>>> >       <source dir='/another/valid/filesystem/location'/>
>>> >       <target dir='/mnt/android'/>
>>> >     </filesystem>
>>> >     <interface type='bridge'>
>>> >       <mac address='xx:xx:xx:xx:xx:xx'/>
>>> >       <source bridge='br1'/>
>>> >     </interface>
>>> >     <console type='pty'>
>>> >       <target type='lxc' port='0'/>
>>> >     </console>
>>> >     <hostdev mode='capabilities' type='misc'>
>>> >       <source>
>>> >         <char>/dev/kvm</char>
>>> >       </source>
>>> >     </hostdev>
>>> >     <hostdev mode='subsystem' type='usb' managed='yes'>
>>> >       <source>
>>> >         <vendor id='0x04e8'/>
>>> >         <product id='0x6860'/>
>>> >   </source>
>>> >     </hostdev>
>>> >   </devices>
>>> > </domain>
>>>
>>> Your config looks fine here.
>>>
>>> >
>>> > Everything worked fine until I added the USB <hostdev> element. I'm
>>> > essentially trying to get access to a physical Android device
>>> connected to
>>> > the host from inside a container. When I go to start the container, I
>>> get
>>> > an error about Operation not permitted. Here's the relevant bits from
>>> > /var/log/libvirt/lxc/machine.log:
>>> >
>>> > 2014-04-11 22:46:40.491+0000: starting up
>>> > PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin
>>> > LIBVIRT_DEBUG=3 LIBVIRT_LOG_OUTPUTS=3:stderr
>>> /usr/lib/libvirt/libvirt_lxc
>>> > --name oshi32134 --console 24 --security=none --handshake 27
>>> --background
>>> > --veth vnet1
>>> > 2014-04-11 22:46:40.597+0000: 685: info : libvirt version: 1.2.2
>>> > 2014-04-11 22:46:40.597+0000: 685: error :
>>> > virLXCControllerSetupHostdevSubsysUSB:1390 : Unable to create device
>>> > //var/run/libvirt/lxc/oshi32134.dev/bus/usb//002//003: Operation not
>>> > permitted
>>> > Unable to create device
>>> > //var/run/libvirt/lxc/oshi32134.dev/bus/usb//002//003: Operation not
>>> > permitted
>>>
>>> Do you have AppArmour enabled on the machine. That seems like the
>>> most likely thing that would result in libvirt getting that permission
>>> error.
>>>
>>> Regards,
>>> Daniel
>>> --
>>> |: http://berrange.com      -o-
>>> http://www.flickr.com/photos/dberrange/ :|
>>> |: http://libvirt.org              -o-
>>> http://virt-manager.org :|
>>> |: http://autobuild.org       -o-
>>> http://search.cpan.org/~danberr/ :|
>>> |: http://entangle-photo.org       -o-
>>> http://live.gnome.org/gtk-vnc :|
>>>
>>
>>
>
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