Re: selinux vs devtmpfs (vs udev)

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On 09/01/2010 12:08 PM, Stephen Smalley wrote:
> On Tue, Aug 31, 2010 at 4:51 PM, Eric Paris <eparis@xxxxxxxxxx> wrote:
>> On Tue, 2010-08-31 at 21:32 +0200, Kay Sievers wrote:
>>> On Tue, Aug 31, 2010 at 17:49, Harald Hoyer <harald@xxxxxxxxxx> wrote:
>>>> https://bugzilla.redhat.com/show_bug.cgi?id=575128#c14
>>>> https://bugzilla.redhat.com/attachment.cgi?id=442223&format=raw
>>>>
>>>> udev/udev-node.c
>>>>
>>>> +                       /* set selinux file context on add events */
>>>> +                       if (strcmp(udev_device_get_action(dev), "add") == 0)
>>>> +                               udev_selinux_lsetfilecon(udev, file, mode);
>>>
>>> I can't access these bugs.
>>>
>>> Does that makes sense/work for you?
>>>   http://git.kernel.org/?p=linux/hotplug/udev.git;a=commitdiff;h=326c5fc3ea684825629eccaf33a548759162a539
>>>
>>> Kay
>>
>> I ask Harald (but he wasn't around and I don't know the answer) if it is
>> a problem that this changes the behavior of non "add" events.
>> Previously a non "add" event with an incorrect mask/uid/gid would have
>> reset the SELinux context but now it will not.  It fixes the issue at
>> hand, my boxes boot with everything labeled nicely, but I'm not sure if
>> there is some other corner case that expected the old behavior with
>> change events....
> 
> Maybe we should back up and ask the udev folks how they think libvirt
> labeling should be done so as to not conflict with udev labeling, e.g.
> should libvirt be going through udev to assign the labels.
> 
> 
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> 
Well I guess I would not want someone chcon a device and then udev
fixing the label.  Especially on MLS machines.
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