You are describing GPU from 1990s. Modern GPU is essentially a general purpose computer sitting on the PCIe bus and able to do anything the CPU can. It does not

You are describing GPU from 1990s. Modern GPU is essentially a general purpose computer sitting on the PCIe bus and able to do anything the CPU can. It does not have to run pure functions (e.g. see how it can be used for normal graphics tasks in [1]) and can write any location in the memory it can see. Securing it is as easy/hard as securing a CPU: if you screw up and expose some memory to the GPU it can be owned just like the memory exposed to a CPU task[2]. 1. https://software.intel.com/en-us/blogs/2013/07/18/order-independent-transparency-approximation-with-pixel-synchronization https://software.intel.com/en-us/blogs/2013/07/18/order-inde... 2. http://beta.ivc.no/wiki/index.php/Xbox_360_King_Kong_Shader_Exploit http://beta.ivc.no/wiki/index.php/Xbox_360_King_Kong_Shader_...