src/jdk.jfr/share/classes/jdk/jfr/internal/SecuritySupport.java

*** 29,38 ****
--- 29,39 ----
  import java.io.FileNotFoundException;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.RandomAccessFile;
  import java.io.Reader;
+ import java.lang.invoke.MethodHandles;
  import java.lang.reflect.Constructor;
  import java.lang.reflect.Field;
  import java.lang.reflect.Method;
  import java.lang.reflect.ReflectPermission;
  import java.nio.channels.FileChannel;
*** 69,78 ****
--- 70,80 ----
   * Contains JFR code that does
   * {@link AccessController#doPrivileged(PrivilegedAction)}
   */
  public final class SecuritySupport {
      private final static Unsafe unsafe = Unsafe.getUnsafe();
+     private final static MethodHandles.Lookup LOOKUP = MethodHandles.lookup();
      private final static Module JFR_MODULE = Event.class.getModule();
      public  final static SafePath JFC_DIRECTORY = getPathInProperty("java.home", "lib/jfr");
  
      static final SafePath USER_HOME = getPathInProperty("user.home", null);
      static final SafePath JAVA_IO_TMPDIR = getPathInProperty("java.io.tmpdir", null);
*** 379,390 ****
  
      static void ensureClassIsInitialized(Class<?> clazz) {
          unsafe.ensureClassInitialized(clazz);
      }
  
!     static Class<?> defineClass(String name, byte[] bytes, ClassLoader classLoader) {
!         return unsafe.defineClass(name, bytes, 0, bytes.length, classLoader, null);
      }
  
      static Thread createThreadWitNoPermissions(String threadName, Runnable runnable) {
          return doPrivilegedWithReturn(() -> new Thread(runnable, threadName), new Permission[0]);
      }
--- 381,401 ----
  
      static void ensureClassIsInitialized(Class<?> clazz) {
          unsafe.ensureClassInitialized(clazz);
      }
  
!     static Class<?> defineClass(Class<?> lookupClass, byte[] bytes) {
!         return AccessController.doPrivileged(new PrivilegedAction<>() {
!             @Override
!             public Class<?> run() {
!                 try {
!                     return MethodHandles.privateLookupIn(lookupClass, LOOKUP).defineClass(bytes);
!                 } catch (IllegalAccessException e) {
!                     throw new InternalError(e);
!                 }
!             }
!         });
      }
  
      static Thread createThreadWitNoPermissions(String threadName, Runnable runnable) {
          return doPrivilegedWithReturn(() -> new Thread(runnable, threadName), new Permission[0]);
      }