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SubjectRe: [PATCH 2/7] Overlayfs: Use copy-up security hooks
Date
On Friday, November 07, 2014 10:05:40 PM David Howells wrote:
> Paul Moore <paul@paul-moore.com> wrote:
> > So the LSM must modify the xattr in place? I suppose that since the
> > @value is allocated to the max size it shouldn't be a problem. Just
> > checking ...
>
> ... And the caller must provide a maximally sized buffer (which it likely
> has to allocate anyway).
>
> I'm not sure I really need to provide the modification thing. I suspect a
> binary keep or discard decision is sufficient.

The docker use case we've been talking about in this thread doesn't really
care about the on-disk file labels (xattrs) because the docker folks want to
use context= mounts; however if someone did care about on-disk file labels for
the upper layer in the overlayfs then they might want to modify the xattr.

--
paul moore
www.paul-moore.com



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