RFR(S) 8166304: Skipping access check for classes generated by core reflection

[harold seigel]

Hi,

Please review this fix for bug JDK-8166304.  The fix throws an 
IllegalAccessError exception when attempting to create a class that is a 
sub-type of a jdk.internal.reflect class, unless the class loader is 
either the boot loader or the special reflection class loader.  This 
prevents user classes from being able to extend jdk.internal.reflect 
classes in order to bypass Reflection.getCallerClass.

Open webrev: http://cr.openjdk.java.net/~hseigel/bug_8166304/

JBS bug: https://bugs.openjdk.java.net/browse/JDK-8166304

The fix was tested with the JCK Lang and vm tests, the JTreg hotspot, 
java/io, java/lang, and java/util tests, the nsk co-located and the 
non-co-located tests, the RBT tier2 tests, and the test in the webrev.

A sample error message looks like this:

java.lang.IllegalAccessError: class FakeMethodAccessor loaded by 
jdk/internal/loader/ClassLoaders$AppClassLoader cannot access 
jdk/internal/reflect superclass jdk.internal.reflect.MethodAccessorImpl

Thanks, Harold