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On 04/17/2013 12:53 PM, Dominick Grift wrote:
On Wed, 2013-04-17 at 23:18 +0800, bigclouds wrote:
> a process can access a file , they have same MCS. the authority of
> access the file is its biggest authority or smallest authority?
Not sure if i understand your question but the MCS range of the source
operating on the target needs to be exactly the same i believe
> can anythings else the process have access to, besides the file? thanks
>
Here are the MCS rules:
https://git.fedorahosted.org/cgit/selinux-policy.git/tree/policy/mcs
You can look there to see how mcs affects the policy
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> At 2013-04-17 21:15:10,"Dominick Grift" <dominick.grift(a)gmail.com>
> wrote:
>> On Wed, 2013-04-17 at 17:49 +0800, bigclouds wrote:
>>> hi,all a qemu-kvm process and its disk(image file) have the same
>>> MCS(s0:c111,c555). it express this process have access to this
>>> image. i do not know the power to access its image file is the max or
>>> min? if any other power this process(domain) has?how much? i want to
>>> know the exact power a qemu-kvm process has besides access its image
>>> file ,other kinds of files,dirs etc.
>>
>> I do not fully understand your question and the information you
>> provided does not clarify the issues for me but:
>>
>> Here you can find the Fedora MCS rules:
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>>
https://git.fedorahosted.org/cgit/selinux-policy.git/tree/policy/mcs
>>
>> To see what all types have assigned the mcs_contrained_type attribute:
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>> seinfo -xamcs_constrained_type
>>
>>>
>>> my test case: after start a guestVM(its disk xml ,cache='none'
>>> error_policy='stop'), make some modification on its files and save
>>> them. then go to hypervisor, modify the MCS of guestVM's image file.
>>> 1.i can read those files(cache=none)?it s hould not be so. why?
>>> 2.then modify files and save, the guestVM hang, it is paused on UI.
>>> this is right qeum process can not write again. why this guestVM is
>>> hang? and can not be resumed 3.look at audit info. denied { write }
>>> for pid=52162 comm="qemu-kvm". that pid is 52162, is not my
>>> qemu-kvm's pid? why?
>>>
>>> thanks so much.
>>>
>>>
>>> -- selinux mailing list selinux(a)lists.fedoraproject.org
>>>
https://admin.fedoraproject.org/mailman/listinfo/selinux
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-- selinux mailing list selinux(a)lists.fedoraproject.org
https://admin.fedoraproject.org/mailman/listinfo/selinux
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