commit 273d2c67c3e179adb1e74f403d1e9a06e3f841b5
author Eric W. Biederman <ebiederm@xmission.com> Fri Dec 05 18:01:11 2014 -0600
committer Eric W. Biederman <ebiederm@xmission.com> Tue Dec 09 16:58:40 2014 -0600
tree 500bf14c930ea5c1db4c40dec54d95a00085552c
parent 0542f17bf2c1f2430d368f44c8fcf2f82ec9e53e

userns: Don't allow setgroups until a gid mapping has been setablished

setgroups is unique in not needing a valid mapping before it can be called,
in the case of setgroups(0, NULL) which drops all supplemental groups.

The design of the user namespace assumes that CAP_SETGID can not actually
be used until a gid mapping is established.  Therefore add a helper function
to see if the user namespace gid mapping has been established and call
that function in the setgroups permission check.

This is part of the fix for CVE-2014-8989, being able to drop groups
without privilege using user namespaces.

Cc: stable@vger.kernel.org
Reviewed-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>