tree 41b53e385d947c568b237f5eb3690098d2efd8f6
parent ec98ce480ada787f2cfbd696980ff3564415505b
author Serge E. Hallyn <serue@us.ibm.com> 1228331826 -0600
committer James Morris <jmorris@namei.org> 1228688182 +1100

user namespaces: let user_ns be cloned with fairsched

(These two patches are in the next-unacked branch of
git://git.kernel.org/pub/scm/linux/kernel/git/sergeh/userns-2.6.
If they get some ACKs, then I hope to feed this into security-next.
After these two, I think we're ready to tackle userns+capabilities)

Fairsched creates a per-uid directory under /sys/kernel/uids/.
So when you clone(CLONE_NEWUSER), it tries to create
/sys/kernel/uids/0, which already exists, and you get back
-ENOMEM.

This was supposed to be fixed by sysfs tagging, but that
was postponed (ok, rejected until sysfs locking is fixed).
So, just as with network namespaces, we just don't create
those directories for user namespaces other than the init.

Signed-off-by: Serge E. Hallyn <serue@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>