On 25/10/2011, at 9:49 AM, Adam Barth wrote:

>> Adam's point in the bug is that any operation that can access colour 
>> channels might be able to perform a timing attack. This would include SVG 
>> filters operating on HTML content without any hardware acceleration.
>> 
>> For this reason I'm still tempted to suggest the combination of CSS_FILTERS 
>> + WEBGL is enough of a switch for ports to disable this, but I'm happy to 
>> add another one.
>> 
>> I'm not sure at what point we should take the discussion from this list and 
>> onto bugzilla.
> 
> I don't believe you understand the security issue.  I'd recommend you
> seek the advice of security experts to help you make this decision.

OK, I'll make sure CSS Shaders has a separate flag which allows ports to turn 
it off. But you'll still be susceptible to the same problems with CSS_FILTERS, 
and with the current implementation of SVG filters that you support.

Dean

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