[PATCH 1/1] simplified security.nscapability xattr

[Seth Forshee]

On Fri, Apr 22, 2016 at 12:26:33PM -0500, serge.hallyn at ubuntu.com wrote:
> From: Serge Hallyn <serge.hallyn at ubuntu.com>
> 
> This can only be set by root in his own namespace, and will
> only be respected by namespaces with that same root kuid
> mapped as root, or namespaces descended from it.
> 
> This allows a simple setxattr to work, allows tar/untar to
> work, and allows us to tar in one namespace and untar in
> another while preserving the capability, without risking
> leaking privilege into a parent namespace.
> 
> Signed-off-by: Serge Hallyn <serge.hallyn at ubuntu.com>

Seems like the simplest possible design which meets the requirements.

Acked-by: Seth Forshee <seth.forshee at canonical.com>