[PATCH] devpts: Make ptmx be owned by the userns owner instead of userns-local 0

Alexander Larsson alexl at redhat.com
Mon Mar 14 15:42:55 UTC 2016

On sön, 2016-03-13 at 22:06 -0700, Andy Lutomirski wrote:
> We used to have ptmx be owned by the inner uid and gid 0.  Change
> this: if the owner and group are both mapped but are not both 0,
> then use the owner instead.
> For container-style namespaces (LXC, etc), this should have no
> effect -- UID 0 is will either be the owner or will be unmapped.
> The important behavior change is for sandboxes: many sandboxes
> intentionally do not create an inner uid 0.  Without this patch,
> mounting devpts in such a sandbox is awkward.  With this patch, it
> will just work and ptmx will be owned by the namespace owner.
> Cc: Alexander Larsson <alexl at redhat.com>
> Cc: mclasen at redhat.com
> Cc: "Eric W. Biederman" <ebiederm at xmission.com>
> Cc: Linux Containers <containers at lists.linux-foundation.org>
> Signed-off-by: Andy Lutomirski <luto at kernel.org>

Tested-by: Alexander Larsson <alexl at redhat.com>

Seems to work fine for me! Thanks!

 Alexander Larsson                                            Red Hat, Inc 
       alexl at redhat.com            alexander.larsson at gmail.com 
He's an uncontrollable voodoo librarian with a robot buddy named Sparky. 
She's a cynical winged journalist from the wrong side of the tracks. They 
fight crime! 

More information about the Containers mailing list