> Only if the program was written in a way that allowed for legitimate access to P1. You’re articulating this as if P1 was out of thin air; it’s not.
My program:
if (p == P2) return p[attacker_controlled_index];
If the return statement can access P1, disjoint from P2, that's a weird execution for any useful definition of "weird". You can't just define the problem away.
Your central claim is that you can take any old C program, compile it with Fil-C, and get a memory-safe C program. Turns out you get memory safety only if you write that C program with Fil-C's memory model and its limits in mind. If someone's going to do that, why not write instead with Rust's memory model in mind and not pay a 4x performance penalty?
My program:
If the return statement can access P1, disjoint from P2, that's a weird execution for any useful definition of "weird". You can't just define the problem away.Your central claim is that you can take any old C program, compile it with Fil-C, and get a memory-safe C program. Turns out you get memory safety only if you write that C program with Fil-C's memory model and its limits in mind. If someone's going to do that, why not write instead with Rust's memory model in mind and not pay a 4x performance penalty?