Security/Reviews/Firefox10/CSS3DTransforms

Items to be reviewed

CSS3 3D Transforms

• Feature Page: https://wiki.mozilla.org/CSS3_3D_Transforms
• Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=505115
• Spec: http://dev.w3.org/csswg/css3-3d-transforms/

Introduce Feature

Goal of Feature, what is trying to be achieved (problem solved, use cases, etc)

• extends CSS transforms with new keywords to transform any CSS into a 3D perspective
  • this uses the 3D features of the graphics card, most of this already done in the graphics area so this just extended into that

Why was this solution chosen?

• proposed CSS standard

Any security threats already considered in the design and why?

• N/A

Threat Brainstorming

• interaction with graphics card, support, crashes (QA perspective)
  • this is nothing we did not already have with layout
  • consider fuzzing on a wider variety of graphics cards/drivers. but this is most likely to find graphics card bugs (in which case we'd blacklist) rather than firefox/cairo bugs, and it's probably not worth the effort.
• <discussion of Jesse's fuzzing techniques>
  • seems to indicate that he is using the correct path
• Does the 3D transform code use a different path compared to 2D when page is navigated
  • No, there shouldn't be a residual image in graphics framebuffer
• Since this is a proposed spec is it prefixed or pref-ed off by default?
  • prefixed with -moz-
  • we have a pref for now, default to enabled, and will probably remove it in a few releases
    • preffing it off is likely to break sites, because they'll detect support and try to use the non-working CSS properties. so preffing off the feature isn't a great mitigation to have.
    • Site compat bug: https://bugzilla.mozilla.org/show_bug.cgi?id=682627

Conclusions / Action Items

• [Jesse] continue fuzzing, general CSS fuzzing