RFR: 8013527: calling MethodHandles.lookup on itself leads to errors

[Johannes Kuhn]

On Wed, 3 Feb 2021 17:25:04 GMT, Mandy Chung <mchung at openjdk.org> wrote:

>> Only `Lookup` with the original access can access `MethodHandles.classData`.   A hidden class `HC$$InjectedInvoker/0x1234` can access private members of another class `C` in the same nest but not `C`'s class data.
>> 
>> I don't follow which previous commit you refer to more dangerous.  Please elaborate.   I don't see any security concern with class data.
>
> Last night, I had a second thought that the fix for these two JBS issues does not need the class data.  It's more for a future use.  I plan to revise it and drop class data in this fix anyway.

You are right, got it confused with the future use.

With this fix, MethodHandle -> Method.invoke -> MethodHandles.lookup() will still return a lookup on the injected invoker.  
I somehow missed that this is not part of the fix, but for the future use.

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PR: https://git.openjdk.java.net/jdk/pull/2367