[lmm]

> Can I ask you to be specific here? The worse memory corruption vulnerabilities enable trivial remote code execution and full and surreptitious reliable takeovers of victim machines. What's a non-memory-corruption UB that has a worse impact?

I guess just the same kind of vulnerability, but plus the fact that there are no possible countermeasures even in theory. I'm not sure I have a full picture of what kind of non-UB memory-corruption cases lead to trivial remote code execution, but I imagine them as being things like overwriting a single segment of memory. It's at least conceivable that someone could, with copious machine assistance, write a program that was safe against any single segment overwrite at any point during its execution. Even if you don't go that far, you can reason about what kinds of corruption can occur and do things to reduce their likelihood or impact. Whereas UB offers no guarantees like that, so there's no way to even begin to mitigate its impact (and this does matter in practice - we've seen people write things like defensive null checks that were intended to protect their programs against "impossible" conditions, but were optimised out because the check could only ever fail on a codepath that had been reached via undefined behaviour).

[tptacek]

I'm sorry, I'm worried I've cost us some time by being unclear. It would be easy for me to cite some worst-case memory corruption vulnerabilities with real world consequences. Can you do that with your worst-case UB? I'm looking for, like, a CVE.

[lmm]

> It would be easy for me to cite some worst-case memory corruption vulnerabilities with real world consequences.

Could you do that for a couple of non-UB ones then? That'll make things a lot more concrete. As far as I can remember most big-name memory safety vulnerabilities (e.g. the zlib double free or, IDK, any random buffer overflow like CVE-2020-17541) have been UB.

[tptacek]

Wasn't CVE-2020-17541 a bog-standard stack overflow? Your task is to find a UB vulnerability that is not a standard memory corruption vulnerability, or one caused by (for instance) an optimizer pass that introduces one into code that wouldn't otherwise have a vulnerability.

[lmm]

Cases that are both memory corruption and UB tell us nothing about one being worse than the other. My initial claim in this thread was "the worst case of UB is worse than the worst case of most kinds of non-UB memory safety issues" and I stand by that; if your position is that memory corruption is worse then I'd ask you to give examples of non-UB memory corruption having worse outcomes.

[tptacek]

So, none then?

[lmm]

Maybe. I'm not going to shoot for your moved goalposts until you at least show the thing you claimed was "easy... to cite" first