>>11627046 (lb)
Interesting read. Guy is essentially saying that he found a way to hack the old C compiler in a way that it could inject malicious code WHEN COMPILING. This would not be seen in the src files that say Dominion devs were writing, assuming their compilers had been compromised. Basically you can't trust any software you didn't write yourself.
Here's his summary:
The moral is obvious. You can't trust code that you did not totally create yourself. (Especially code from companies that employ people like me.) No amount of source-level verification or scrutiny will protect you from using untrusted code. In demonstrating the possibility of this kind of attack, I picked on the C compiler. I could have picked on any program-handling program such as an assembler, a loader, or even hardware microcode. As the level of program gets lower, these bugs will be harder and harder to detect. A well-installed microcode bug will be almost impossible to detect.