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From "Jesse Wilson (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-6264) Need a new native method: VM.getStackClass()
Date Wed, 08 Jul 2009 21:59:14 GMT
Need a new native method: VM.getStackClass()
--------------------------------------------

                 Key: HARMONY-6264
                 URL: https://issues.apache.org/jira/browse/HARMONY-6264
             Project: Harmony
          Issue Type: Bug
          Components: Classlib
    Affects Versions: 5.0M10
         Environment: SVN Revision: 785439
            Reporter: Jesse Wilson
            Priority: Minor
         Attachments: getStackClass.patch

We need a new native method, VM.getStackClass(int) to compliment VM.getStackClassLoader()
and Class.getStackClasses(). It needs to be implemented in the VM vendors. I can fix Android's
Dalvik VM, but I'll need a Harmony volunteer to fix DRLVM.

Background:
To implement AtomicReferenceFieldUpdater securely, it's necessary to capture the class of
the caller, not just the class loader of the caller. Otherwise a rogue class (say, EvilBufferedInputStream)
could use an AtomicReferenceFieldUpdater to modify protected fields of arbitrary instances
(such as the buffer field of somebody else's BufferedInputStream).

This blocks HARMONY-6262, which updates of our copy of java.util.concurrent to Doug Lea's
latest. The getStackClass() call is needed for line 181 and its result is used on line 262:
  http://gee.cs.oswego.edu/cgi-bin/viewcvs.cgi/jsr166/src/main/java/util/concurrent/atomic/AtomicReferenceFieldUpdater.java?annotate=1.41


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