8190482: InnocuousThread creation should not require the caller to possess...

8190482: InnocuousThread creation should not require the caller to possess enableContextClassLoaderOverride
Reviewed-by: rriggs, mchung

src/java.base/share/classes/jdk/internal/misc/InnocuousThread.java

@@ -62,11 +62,17 @@ public final class InnocuousThread extends Thread {
      * set to the system class loader.
      */
     public static Thread newThread(String name, Runnable target) {
+        return AccessController.doPrivileged(
+                new PrivilegedAction<Thread>() {
+                    @Override
+                    public Thread run() {
                         return new InnocuousThread(INNOCUOUSTHREADGROUP,
                                                    target,
                                                    name,
                                                    ClassLoader.getSystemClassLoader());
                     }
+                });
+    }
 
     /**
      * Returns a new InnocuousThread with an auto-generated thread name.
@@ -80,9 +86,15 @@ public final class InnocuousThread extends Thread {
      * Returns a new InnocuousThread with null context class loader.
      */
     public static Thread newSystemThread(String name, Runnable target) {
+        return AccessController.doPrivileged(
+                new PrivilegedAction<Thread>() {
+                    @Override
+                    public Thread run() {
                         return new InnocuousThread(INNOCUOUSTHREADGROUP,
                                                    target, name, null);
                     }
+                });
+    }
 
     private InnocuousThread(ThreadGroup group, Runnable target, String name, ClassLoader tccl) {
         super(group, target, name, 0L, false);