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// Trusted.java

import java.security.*;

public class Trusted {

   public static void loadLibrary(final String library){
      AccessController.doPrivileged(new PrivilegedAction<Void>() {
         public Void run() {
             System.loadLibrary(library);
             return null;
         }
      });
   }
}

////////////////////////////////////////////////////////////////////////////////////---------------------------------------------------------------------------------

// Untrusted.java

public class Untrusted {

   private native void bufferOverflow();

   public static void main(String[] args) {
      String library = new String("BufferOverflow");
      Trusted.loadLibrary(library);
      new Untrusted.bufferOverflow();  // invoke the native method
   }
}