From b042176ac78c191253124063054b63153abcbe96 Mon Sep 17 00:00:00 2001
From: Andrey Konovalov <andreyknvl@google.com>
Date: Fri, 17 Feb 2017 16:07:48 +0100
Subject: host: open /dev/net/tun to check if syz_emit_ethernet is enabled

---
 host/host.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/host/host.go b/host/host.go
index 74696e46d..1cea844ff 100644
--- a/host/host.go
+++ b/host/host.go
@@ -99,7 +99,10 @@ func isSupportedSyzkall(c *sys.Call) bool {
 		_, err := os.Stat("/dev/fuse")
 		return err == nil && syscall.Getuid() == 0
 	case "syz_emit_ethernet":
-		_, err := os.Stat("/dev/net/tun")
+		fd, err := syscall.Open("/dev/net/tun", syscall.O_RDWR, 0)
+		if err == nil {
+			syscall.Close(fd)
+		}
 		return err == nil && syscall.Getuid() == 0
 	case "syz_kvm_setup_cpu":
 		switch c.Name {
-- 
cgit mrf-deployment