[Webkit-unassigned] [Bug 87687] New: Check for GTK2/GTK3 symbol mismatch earlier

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=87687

           Summary: Check for GTK2/GTK3 symbol mismatch earlier
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: dsd at laptop.org



Daniel Drake <dsd at laptop.org> changed:

           What    |Removed                     |Added
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 Attachment #144423|                            |review?
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Created an attachment (id=144423)
 --> (https://bugs.webkit.org/attachment.cgi?id=144423&action=review)
patch

WebKit2 move plugins into their own process, but WebKit1 (built for GTK3) is left with the limitation that if a plugin links against GTK2, it will fail to run.

nspluginwrapper could maybe work around this issue, by adding in a process separation, but this doesn't work on current released WebKit. The affected sites just show an empty box where the content should be.

Using Flash as an example, I dug down and found that the behaviour is something like the following:
 - Load both "real" libflashplayer and the wrapped libflashplayer
 - Try to show the flash content using the real libflashplayer
 - Abort because a mix of GTK2/GTK3 symbols was detected

And that's it - it didn't even try the wrapped libflashplayer which advertises support for the same mime types.

I found a way to fix this: Move the GTK2/GTK3 symbol check earlier, and don't even register plugins in the PluginDatabase if there is a symbol mismatch. See attached patch.

With this patch applied, I can finally view flash content in recent Epiphany versions, via nspluginwrapper!

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