[Webkit-unassigned] [Bug 73339] New: Add an internal targetOrigin member to MessageEvent

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=73339

           Summary: Add an internal targetOrigin member to MessageEvent
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: ASSIGNED
          Severity: Normal
          Priority: P2
         Component: Event Handling
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: supersat at chromium.org
            Blocks: 73337


To support cross-process postMessage in Chromium (bug 73337), we need to be able to check the postMessage's target origin in Chromium to avoid time-of-check-to-time-of-use security bugs. However, the MessageEvent generated by WebKit doesn't contain the target origin, so the event listeners in Chromium currently can't get this information. We need to add a targetOrigin member to track this. This change will not affect the MessageEvent IDL, so none of the bindings will be aware of this change.

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