ACK/cmt: [SRU][UNSTABLE][PATCH] UBUNTU: SAUCE: shiftfs: record correct creator credentials

[Christian Brauner]

On Fri, Apr 10, 2020 at 10:06:32AM -0500, Seth Forshee wrote:
> On Fri, Apr 10, 2020 at 04:55:28PM +0200, Christian Brauner wrote:
> > From: Christian Brauner <christian.brauner at ubuntu.com>
> > 
> > BugLink: https://bugs.launchpad.net/bugs/1872094
> > 
> > When shiftfs is nested we failed to be able to create any files or
> > access directories because we recorded the wrong creator credentials. We
> > need to record the credentials of the creator of the lowers mark mount
> > of shiftfs. Otherwise we aren't privileged wrt to the shiftfs layer in
> > the nesting case. This is similar to how we always record the user
> > namespace of the base filesystem.
> > 
> > Suggested-by: Seth Forshee <seth.forshee at canonical.com>
> > Signed-off-by: Christian Brauner <christian.brauner at ubuntu.com>
> 
> This looks right to me.
> 
> Acked-by: Seth Forshee <seth.forshee at canonical.com>
> 
> Not sure why you only sent this for unstable though. Shouldn't it also
> go back to E/F?

Yes, it should go to all LTS kernels that do have shiftfs. The reason I
only put UNSTABLE in the subject is because I developed in on top of it
and it has HEAD~1 as base commit from unstable. Otherwise the patch
should just apply cleanly to all LTS. Next time I can just tag all of
them in the subject.


Thanks!
Christian