From: "Serge E. Hallyn" <serue@us.ibm.com>

When CONFIG_UTS_NS=n, clone(CLONE_NEWUTS) quietly refuses.  So correctly does
not unshare a new uts namespace, but also does not return -EINVAL.

Fix this to return -EINVAL so the caller knows his request was denied.

Signed-off-by: Serge E. Hallyn <serue@us.ibm.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/linux/utsname.h |    2 ++
 1 file changed, 2 insertions(+)

diff -puN include/linux/utsname.h~utsns-fix-config_uts_ns-behavior include/linux/utsname.h
--- a/include/linux/utsname.h~utsns-fix-config_uts_ns-behavior
+++ a/include/linux/utsname.h
@@ -70,6 +70,8 @@ static inline int unshare_utsname(unsign
 
 static inline int copy_utsname(int flags, struct task_struct *tsk)
 {
+	if (flags & CLONE_NEWUTS)
+		return -EINVAL;
 	return 0;
 }
 static inline void put_uts_ns(struct uts_namespace *ns)
_