8194734: Handle to jimage file inherited into child processes (win)

Reviewed-by: alanb

src/java.base/windows/native/libjimage/osSupport_windows.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -38,7 +38,8 @@
  * Return the file descriptor.
  */
 jint osSupport::openReadOnly(const char *path) {
-    return ::open(path, 0, 0);
+    // jimage file descriptors must not be inherited by child processes
+    return ::open(path, O_BINARY | O_NOINHERIT, O_RDONLY);
 }
 
 /**