Re: [RFC] lsm: namespace hooks

[Eric W. Biederman]

Lukasz Pawelczyk <l.pawelczyk@xxxxxxxxxxx> writes:

> On czw, 2014-11-27 at 16:01 +0100, Richard Weinberger wrote:
>> Am 27.11.2014 um 15:44 schrieb Lukasz Pawelczyk:
>> > True, the last one is 0x80000000. I did not notice that. Thanks for
>> > pointing out.
>> 
>> Isn't this CLONE_IO?
>
> Yes, I was merely noticing out loud that it's the last bit of 32bit.
>
> After close look though the 0x00001000 appears to be unused
>
>> > Any suggestion on what can be done here? New syscal with flags2?
>> 
>> I'm not sure. But a new syscall would be a candidate.

We are probably going to need to go a couple rounds with this but at
first approximation I think this functionality needs to be tied to the
user namespace.  This functionality already looks half tied to it.

When mounting filesystems with user namespaces priveleges matures a
little more you should be able to use unmapped labels.  In the near term
we are looking at filesystems such as tmpfs, fuse and posibly extN.

Eric

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