From: Serge E. Hallyn <serue@us.ibm.com>
Date: Tue, 27 Mar 2007 05:32:22 +0000 (-0800)
Subject: [PATCH] utsns: fix !CONFIG_UTS_NS behavior
X-Git-Tag: v2.6.21-rc6~100
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=78d832f62643ac6209beccbfb29228314423935e;p=linux-2.6

[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@us.ibm.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/include/linux/utsname.h b/include/linux/utsname.h
index a4555fe375..e10267d402 100644
--- a/include/linux/utsname.h
+++ b/include/linux/utsname.h
@@ -70,6 +70,8 @@ static inline int unshare_utsname(unsigned long unshare_flags,
 
 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)