Re: [PATCH 08/14] NFSv4: Add label recommended attribute and NFSv4flags

From: James Morris
Date: Sun Apr 05 2009 - 19:34:06 EST


On Fri, 3 Apr 2009, David P. Quigley wrote:

> On Fri, 2009-04-03 at 22:43 +1100, James Morris wrote:
> > On Fri, 3 Apr 2009, David P. Quigley wrote:
> >
> > > We tried to change this to be dynamically allocated based on what was
> > > coming off of the wire but we ran into a problem that it required us to
> > > do allocations where they really shouldn't be done in the rpc/nfsv4
> > > code. Trond suggested to make this static and that if someone really
> > > needed more than a page for their label that something was horrifically
> > > wrong. I'm tempted to agree with him on this but there are people trying
> > > to send contexts with an MLS component with every other compartment set
> > > which tend to be really large.
> >
> > Well, future labels might include cryptographic information, for example.
> >
>
> <removing people from the CC who probably don't care about this>
>
> Could you expand on why this might be needed or what applications would
> use this? It's unclear to me what sort of crypto information would be in
> a context. I know the ecryptfs guys were trying to make crypto decisions
> based on SELinux context in some cases but I never heard of wanting to
> put that kind of information into the context.

Potentially as part of a mandatory cryptographic policy, although the
exact form of the labeling is unknown.

But the main point is that we should not needlessly limit the flexibility
of the system.

--
James Morris
<jmorris@xxxxxxxxx>
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