Hi Andrew,

Today's linux-next merge of the akpm-current tree got a conflict in
kernel/fork.c between commit c2b1df2eb429 ("Rename nsproxy.pid_ns to
nsproxy.pid_ns_for_children") from the net tree and commits 74a7cb7237ad
("pidns: fix vfork() after unshare(CLONE_NEWPID)"), 98c53a09f937 ("pidns:
kill the unnecessary CLONE_NEWPID in copy_process()") and ddb3b016a3f7
("fork: unify and tighten up CLONE_NEWUSER/CLONE_NEWPID checks") from the
akpm-current tree.

I fixed it up (see below) and can carry the fix as necessary (no action
is required).

-- 
Cheers,
Stephen Rothwell                    sfr@canb.auug.org.au

diff --cc kernel/fork.c
index df6e2a8,04a8c2a..0000000

--- a/kernel/fork.c
+++ b/kernel/fork.c

@@@ -1173,13 -1171,15 +1171,16 @@@ static struct task_struct *copy_process
  		return ERR_PTR(-EINVAL);
  
  	/*
- 	 * If the new process will be in a different pid namespace
- 	 * don't allow the creation of threads.
+ 	 * If the new process will be in a different pid or user namespace
+ 	 * do not allow it to share a thread group or signal handlers or
+ 	 * parent with the forking task.
  	 */
- 	if ((clone_flags & (CLONE_VM|CLONE_NEWPID)) &&
- 	    (task_active_pid_ns(current) !=
- 	     current->nsproxy->pid_ns_for_children))
- 		return ERR_PTR(-EINVAL);
+ 	if (clone_flags & (CLONE_SIGHAND | CLONE_PARENT)) {
+ 		if ((clone_flags & (CLONE_NEWUSER | CLONE_NEWPID)) ||
 -		    (task_active_pid_ns(current) != current->nsproxy->pid_ns))
++		    (task_active_pid_ns(current) !=
++		     current->nsproxy->pid_ns_for_children))
+ 			return ERR_PTR(-EINVAL);
+ 	}
  
  	retval = security_task_create(clone_flags);
  	if (retval)