On May 1, 2013, at 5:29 PM, Antonio Gomes <toniki...@webkit.org> wrote: > - 4.2 Cross-Origin Information Leakage > WebCL's position is that this be handled by the same mechanism as used for > WebGL, ie https://www.khronos.org/registry/webgl/specs/latest/#4.2 . A bug > will be filed to request update of wording in the working draft. > Thanks
> - 4.3 Out-of-Range Memory Access > > The validator will perform static analysis on WebCL kernels to determine > violations of WebCL kernel behavior and language restrictions. The results > from the analysis will also be used to determine any necessary > instrumentation to bring the WebCL kernels in compliance with security and > syntactic requirements of the WebCL API. The RFQ for the WebCL Validator > located at https://cvs.khronos.org/wiki/index.php/WebCL_Validator provides > information on the approach recommended by the WebCL working group. > How do you statically verify the all memory accesses are within bounds without limiting a WebCL kernel to the functionality already offered by shaders in WebGL? > - 4.6 Prevention of potential denial of service (DoS) from long running > kernels: > > This is addressed by the OpenCL CL_CONTEXT_TERMINATE extension. In > http://www.khronos.org/registry/cl/specs/opencl-1.2-extensions.pdf , please > refer to section "9.16 Terminating OpenCL contexts". > I haven't seen any real evidence of widespread support for responsive termination in WebGL shaders yet, and given that the same hardware is involved when you want GPU backed WebCL I don't see how much this will help. > It is chicken-egg problem: without Browser vendors commitment to WebCL, the > motivation for hardware vendors to implement, for example, OpenCL 1.2 "Memory > Initialization" and "Context termination" extensions, required by WebCL, is > not as strong. The extensions mentioned above are required by WebGL shaders, and WebGL has been around for a lot longer (and has even more stringent requirements than WebCL) - are there any GPUs that support the WebGL restrictions natively? --Oliver
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