From 06d91f546f3898982d3b3d4c6869bfc270a7553e Mon Sep 17 00:00:00 2001
From: Chun Chen <ramichen@tencent.com>
Date: Wed, 30 Sep 2015 16:05:49 +0800
Subject: [PATCH] Fix reOpenDevNull

We should open /dev/null with os.O_RDWR, otherwise it won't be
possible writen to it

Signed-off-by: Chun Chen <ramichen@tencent.com>
---
 libcontainer/rootfs_linux.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libcontainer/rootfs_linux.go b/libcontainer/rootfs_linux.go
index 3e3a7d2e..d4cb3961 100644
--- a/libcontainer/rootfs_linux.go
+++ b/libcontainer/rootfs_linux.go
@@ -332,7 +332,7 @@ func setupDevSymlinks(rootfs string) error {
 // symlinks are resolved locally.
 func reOpenDevNull() error {
 	var stat, devNullStat syscall.Stat_t
-	file, err := os.Open("/dev/null")
+	file, err := os.OpenFile("/dev/null", os.O_RDWR, 0)
 	if err != nil {
 		return fmt.Errorf("Failed to open /dev/null - %s", err)
 	}