Re: [PATCH 2/8] user_ns: Introduce user_nsmap_uid and user_ns_map_gid.

On 06/13/2010 05:28 PM, Eric W. Biederman wrote:

Define what happens when a we view a uid from one user_namespace
in another user_namepece.

- If the user namespaces are the same no mapping is necessary.

- For most cases of difference use overflowuid and overflowgid,
  the uid and gid currently used for 16bit apis when we have a 32bit uid
  that does fit in 16bits.  Effectively the situation is the same,
  we want to return a uid or gid that is not assigned to any user.

- For the case when we happen to be mapping the uid or gid of the
  creator of the target user namespace use uid 0 and gid as confusing
  that user with root is not a problem.

Signed-off-by: Eric W. Biederman <ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>

I suppose this one should go via Andrew, not Dave.

Anyway, Acked-by: Pavel Emelyanov [off-list ref]