From: Cedric Le Goater <clg@fr.ibm.com>

If the kernel is not configured with the CONFIG_UTS_NS, unshare of ipc
namespace will fail and return -EINVAL.

The patch changes the dummy unshare_utsname() to check the clone flags
before returning.

Signed-off-by: Cedric Le Goater <clg@fr.ibm.com>
Cc: Serge E. Hallyn <serue@us.ibm.com>
Cc: Kirill Korotaev <dev@openvz.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: Andrey Savochkin <saw@sw.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 include/linux/utsname.h |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff -puN include/linux/utsname.h~namespaces-utsname-implement-clone_newuts-flag-fix include/linux/utsname.h
--- a/include/linux/utsname.h~namespaces-utsname-implement-clone_newuts-flag-fix
+++ a/include/linux/utsname.h
@@ -60,8 +60,12 @@ static inline void put_uts_ns(struct uts
 static inline int unshare_utsname(unsigned long unshare_flags,
 			struct uts_namespace **new_uts)
 {
-	return -EINVAL;
+	if (unshare_flags & CLONE_NEWUTS)
+		return -EINVAL;
+
+	return 0;
 }
+
 static inline int copy_utsname(int flags, struct task_struct *tsk)
 {
 	return 0;
_