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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4352) only the test runner should be able to System.exit
Date Mon, 03 Sep 2012 12:31:07 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13447246#comment-13447246
] 

Uwe Schindler commented on LUCENE-4352:
---------------------------------------

The thing we can do is to explicitely all actions for RuntimePermission and leave out exit():
http://docs.oracle.com/javase/6/docs/api/java/lang/RuntimePermission.html

Unfortunately this confuses me: 'This allows an attacker to mount a denial-of-service attack
by automatically forcing the virtual machine to halt. Note: The "exitVM.*" permission is automatically
granted to all code loaded from the application class path, thus enabling applications to
terminate themselves. Also, the "exitVM" permission is equivalent to "exitVM.*".'
So this appears to me that exiting is always possible from classes that are inside the application
ClassLoader (passed via -classpath to JVM). We could only forbid it, if Solr would load ZooKeeper
in a separate ClassLoader. I have to try this out.

The second problem is that policy files only allow "grants" not "deny", so if you grant RuntimePermission.*
(as it is currently) you cannot explicitely forbid it for one code part. You have to do it
vice versa: Disallow it for all (by having the long list of RuntimePermissions instead of
"*") and only allow it for one classloader.
                
> only the test runner should be able to System.exit
> --------------------------------------------------
>
>                 Key: LUCENE-4352
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4352
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Robert Muir
>
> All others should get SecurityException

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