[PATCH] utsns: fix !CONFIG_UTS_NS behavior

[Serge E. Hallyn]

From: "Serge E. Hallyn" <serue@xxxxxxxxxx>
Subject: [PATCH] utsns: fix !CONFIG_UTS_NS behavior

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@xxxxxxxxxx>

---

 include/linux/utsname.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

bc350994ac67df8f1b917f9979c065d87757eabe
diff --git a/include/linux/utsname.h b/include/linux/utsname.h
index a4555fe..e10267d 100644
--- a/include/linux/utsname.h
+++ b/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)
-- 
1.1.6
-
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