Can someone please verify the existence of this string?
Not only does this make the Catalyst driver suspect, it also casts a shadow over the open-source driver. If you remember, AMD pushed *hard* to use a firmware blob in Radeon, instead of the clean-room approach of RadeonHD.
I used to think it didn't matter, but apparently I was naive. Luc Verhaegen was right all along.
Well, either the most stupidly obvious back door code, or maybe exactly what it says: osTestBackdoor == API that bypasses the standard OpenCL APIs to do some form of testing of their OpenCL driver to check that it is interacting with local Operating System correctly.