backport 76283dd2701ca4ad5c1c99a66f3e8e3d0fe55d44

Author: GoeLin

test/jdk/com/sun/tools/attach/java.policy.allow

@@ -1,6 +1,4 @@
 /*
- *
- *
  * Policy file used by unit tests for attach API
  */
 grant {
@@ -15,7 +13,10 @@ grant {
     permission java.lang.RuntimePermission "loadLibrary.attach";
     permission java.util.PropertyPermission "sun.jvmstat.*", "read";
 
-    /* to read configuration file in META-INF/services, and write/delete .attach_pid<pid> */
-    permission java.io.FilePermission "<<ALL FILES>>", "read,write,delete";
+    /* 
+     * To read configuration file in META-INF/services, write/delete .attach_pid<pid>, 
+     * and read symbolic link of /proc/self/ns/mnt.
+     */
+    permission java.io.FilePermission "<<ALL FILES>>", "read,write,delete,readlink";
 };