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Meet FPGA: The Tiny, Powerful, Hackable Bit of Silicon at the Heart of IoT
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MatthewG570
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MatthewG570,
User Rank: Apprentice
9/6/2019 | 8:26:17 AM
HDL / Bitstreams and other ramblings
I started reading this article instead of just skimming it when I came across the use of "hardware definition language" as hardware description language is considerably more common in the 21st century.  Calling a bitstream HDL is like calling an ELF binary file assembly language code at best. Bitstreams are incredibly difficult to hack, though not impossible. Machine code for a CPU is easy, bitstreams are a whole different animal, making exploiting FPGAs much more difficult and typically requires completely re-writing the NVM on which the bitstream resides via JTAG or some other means. Specialized hardware is almost always required to exploit an FPGA, except in the increasingly common scenarios where USB to JTAG interfaces are put on the product itself just as they are on many developer kits.

FPGA experts are not common. Care needs to be taken in not only the development of the HDL but also the electronic circuit design around the FPGA to harden a system. Careless HDL developers using reference hardware designs from FPGA manufactureres will result in many more exploits akin to those found to date. 

 


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