[webkit-dev] Isolated world tests

Oliver Hunt oliver at apple.com
Mon Jul 6 18:44:38 PDT 2009

On Jul 6, 2009, at 5:37 PM, Eric Seidel wrote:

> Currently WebKit avoids this need for Safari directly, by having  
> separate Obj-C and JS bindings around DOM objects.  Properties/ 
> getters/setters added through JS do not affect the Obj-C bindings.   
> Other embedders which call directly through the JS bindings could  
> currently have implementation problems w/o Isolated World  
> functionality.

I'm unsure what you mean by this?  V8 could just as easily have COM or  
C bindings.  The specific issue that "Isolated Worlds" is a feature  
designed specifically to deal with potential vulnerabilities in  
JavaScript so bindings for other languages aren't really relevant.


> -eric
> On Wed, Jul 1, 2009 at 11:07 PM, Oliver Hunt <oliver at apple.com> wrote:
> On Jul 1, 2009, at 10:59 PM, Adam Barth wrote:
> On Wed, Jul 1, 2009 at 7:50 PM, Maciej Stachowiak<mjs at apple.com>  
> wrote:
> We generally wouldn't accept WebKit features that only work with V8,  
> even if
> other ports may not immediately plan to use them.
> I support this principle.
> I haven't thought through whether this particular feature
> should be an exception.
> The main arguments are as follows:
> 1) Isolated worlds is not a web platform feature.  Adding the feature
> to V8 and not to JSC does not create an incompatibility between the
> two engines.  The observable behavior from web content is the same.
> WebKit is not just a web platform API -- it is used in a wide  
> variety different applications -- that said, if this feature wasn't  
> relevant to WebKit it wouldn't need to be in WebKit
> 2) The purpose of implementing isolated worlds is so the app can
> implement an app-specific feature (extensions).  Implementing
> extensions in another app requires a lot more than just isolated
> worlds.
> However if isolated worlds is necessary to provide effective  
> security controls in any application that wished to be extensible in  
> the face of arbitrary untrusted content, and it needs to be in  
> webcore (if it doesn't my prior comment applies, this doesn't need  
> to be in the webkit tree) then any application that wishes to use  
> webkit will need webkit to provide this unless every application  
> shipped its own copy of webkit with its own implementation of  
> isolated worlds.
> 3) I don't foresee the implementation touching any source files
> outside of WebCore/bindings/v8.  Other ports do not need to bear any
> costs because of isolated worlds.
> As i've said if isolated worlds has a real usecase then there is no  
> reason to not actually provide it
> In general, I think using regression tests for features that are not
> directly exposed to Web content, but implemented in WebCore/WebKit, is
> reasonable. For example we have tests that check that WebKit's  
> delegate
> methods relating to load progress are dispatched in the correct order.
> Perhaps I've been indoctrinated into the cult, but I wouldn't want to
> work on something without writing tests.
> Agreed, and what JS engine is being used should not effect the  
> results of those tests.
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