[Webkit-unassigned] [Bug 91419] New: [Blackberry] Any webpage can crash webkit via qnx.callExtensionMethod assuming 'this' is the 'qnx' object

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=91419

           Summary: [Blackberry] Any webpage can crash webkit via
                    qnx.callExtensionMethod assuming 'this' is the 'qnx'
                    object
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Other
               URL: javascript:qnx.callExtensionMethod.apply(window, []);
        OS/Version: Other
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebKit BlackBerry
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: ben at meyerhome.net
                CC: tonikitoo at webkit.org


Run the following in inspector to crash WebKit

qnx.callExtensionMethod.apply(window, []);

In the c++ that handles the function it assumes that when callExtensionMethod is called that 'this' is
the object 'qnx'.  The qnx object has a hidden variable that the code casts and uses, but when 'this' is not qnx such as the example this will cause a
crash.  Any website can insert the above JavaScript to cause the crash.

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