JDK-6672250 : Regression: new jnlp.packEnabled property breaks sophisticated applets using LiveConnect
  • Type: Bug
  • Component: deploy
  • Sub-Component: deployment_toolkit
  • Affected Version: 6u10
  • Priority: P2
  • Status: Closed
  • Resolution: Fixed
  • OS: generic,windows_xp
  • CPU: generic,x86
  • Submitted: 2008-03-06
  • Updated: 2013-01-10
  • Resolved: 2008-05-15
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JDK 6
6u10 b14Fixed
Related Reports
Relates :  
JDK-6378311 - support versioning and pack in plugin and webstart without need for version based download protocol
Relates :  
JDK-6665053 - Access denied when read jnlp.packEnabled jnlp.packEnabled property
Description
The introduction of client-side Pack200 selection in 6378311 has introduced a regression in sophisticated applets using LiveConnect because of the fact that the new code does not use AccessController.doPrivileged() to read the jnlp.packEnabled system property. If JavaScript calls into Java and causes a resource to be loaded, since the JavaScript frame on the stack does not have the permission to read the jnlp.packEnabled system property, a SecurityException will be raised deep in the deployment code and the application will return null for their call to ClassLoader.getResourceAsStream(). This regression was reproduced with NeuroDNA's product at http://www.neurodna.com/ and may affect other real-world applets. It is related to an earlier bug, 6665053.
Comments
SUGGESTED FIX http://sa.sfbay.sun.com/projects/deployment_data/6u10/6672250.0 testcase: http://j2se.east.sun.com/deployment/www/tests/1.6.0_10/6672250
07-03-2008
EVALUATION The introduction of client-side Pack200 selection in 6378311 has introduced a regression in sophisticated applets using LiveConnect because of the fact that the new code does not use AccessController.doPrivileged() to read the jnlp.packEnabled system property. If JavaScript calls into Java and causes a resource to be loaded, since the JavaScript frame on the stack does not have the permission to read the jnlp.packEnabled system property, a SecurityException will be raised deep in the deployment code and the application will return null for their call to ClassLoader.getResourceAsStream(). This regression was reproduced with NeuroDNA's product at http://www.neurodna.com/ and may affect other real-world applets. It is related to an earlier bug, 6665053. Fixed this by properly using AccessController.doPrivileged() to fetch this system property in the PluginURLJarFileCallBack. Also refactored code in the new plug-in to grant the default set of permissions for untrusted code to calls coming in from JavaScript, which are treated as coming from untrusted code hosted at the document base.
07-03-2008