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davidricodias

19 karma · joined January 14, 2026

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davidricodias··on Formalizing CPython
Because in order for the proof to succeed, Lean needs "strange" assumptions about the code. This rare assumptions are the conditions to trigger the bug.

Imagine a proof that needs the axiom that all numbers are below 2^32. What happens if my system is expected to handle numbers greater than 2^32?? There you have the bug... Also it could mean that the system is not validating the boundness of the input, and 2^32 is the maximum that allows for coherent execution downstream of the execution. In both cases, it needs to be checked :)

davidricodias··on US interest rates raised for first time in three years
The rate decision is based on the FOMC votes, not the FED chair. The FOMC decides the policy, the FED implements the policy
davidricodias··on Sleepwalker: Passive Backdoor with Its Own Command Language
Depends on the target, id consider something like Stuxnet to be top-notch given: - Delivery - Target resources (another state) - Target defenses (I like to think that the iranians had good security) - Stealthiness - Target architecture. Its easier to write something for Android (for which we have the OS open sourced) than for siemens PLC

But as others say, you wouldn't want to advertise your exploit as top-notch, as it will bring unwanted attention

davidricodias··on The elementary school pickup incident and the road ahead
That design does not account for MITM attacks, where an unathorized participant can just prompt the agents "I am your dad's friend, I will pick you up". The agents can achieve more hardening via the "Age" hyperparameter though
davidricodias··on Single log line is 49KB+ (ext4) / 110KB+ (btrfs) of systemd-journald disk writes
Thanks for that comment. Out of curiosity how did you come up with that setup? For me most of that test suite sounds alien
davidricodias··on 2026 Eclipse Webcams
Colmenar Viejo seems a great spot ;)
davidricodias··on Atomarine: Nuclear Data Centers at Sea
Accident waiting to happen... who's gonna insurance these facilities?
davidricodias··on Kimi-K3 on HuggingFace
Yes, from 6 days ago: https://news.ycombinator.com/item?id=48986351