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Posted to commits@harmony.apache.org by "Jesse Wilson (JIRA)" <ji...@apache.org> on 2009/07/08 23:59:15 UTC
[jira] Updated: (HARMONY-6264) Need a new native method:
VM.getStackClass()
[ https://issues.apache.org/jira/browse/HARMONY-6264?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jesse Wilson updated HARMONY-6264:
----------------------------------
Attachment: getStackClass.patch
This only patches the classlib. Alongside this patch it is necessary to fix the DRLVM (and any other Harmony VMs)
> 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
>
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> 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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