jdk.internal.reflect.ReflectionFactory and SecurityManager
peter.levart at gmail.com
Mon Dec 26 19:29:36 UTC 2016
There are 2 ReflectionFactory classes in JDK 9. The old one is
sun.reflect.ReflectionFactory which ended in jdk.unsupported module and
to which access is restricted with SecurityManager. There is also new
jdk.internal.reflect.ReflectionFactory which is used internally by JDK,
is exported to internal modules only but still uses SecurityManager to
restrict access to itself. I checked all usages and they all use
AccessControler.doPrivileged() for obtaining the instance of
jdk.internal.reflect.ReflectionFactory, which somehow defeats the
purpose of SecurityManager access checks in this API.
I think this could be simplified by removing the SecurityManager check
from jdk.internal.reflect.ReflectionFactory#getReflectionFactory static
method and change all usages to invoke this method directly without
doPrivileged(). There are already two sensitive internal APIs exposed
without SecurityManager checks: jdk.internal.misc.Unsafe#getUnsafe and
various jdk.internal.misc.SharedSecrets#getXxxAccess methods. So why
wouldn't internal ReflectionFactory be exposed the same way?
This would make obtaining the ReflectionFactory more robust and not
sensitive to bootstrap issues that surfaced recently after my push of a
fix for issues 8062389, 8029459, 8061950.
So, what do you think? Is this a worthwhile cleanup and simplification?
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