--- Log opened Wed Jul 15 00:00:21 2020
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02:01 < stevenroose> Who knows about fuzzing here? Can I just restart the job? Or should I keep the fuzzer error output somewhere? BlueMatt, elichai2 ?
02:02 < stevenroose> It's still in the link, but I'd like to make the MR pass, so I'd like to restart the job..
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02:38 < stevenroose> Ok so I took the hex dump from the fuzzer output and tries to pass it into the encode::deserialize function line the mentioned test does (deser_net_msg) and it just returns an Err. No panic.
02:41 < elichai2> can you send the travis link? (just curious, I don't really have an answer for you)
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10:48 < BlueMatt> stevenroose: you should probably at least keep the hex output from it
10:48 < BlueMatt> and try to run locally
10:49 < BlueMatt> stevenroose: do you have the hex or a travis link? I can try to take a look.
10:59 < stevenroose> The travis link is above, but I already restarted it
10:59 < stevenroose> I think I downloaded the log, one sec
11:01 < stevenroose> Heh, Firefox didn't place the file :| I think I had this before.
11:01 < stevenroose> Well I have the hex in a manual test I made. But I don't know how to run the exact fuzz scenario. I just tried to parse the hex as a Message (it's the deser_net_msg job)
11:02 < stevenroose> That's here: https://gist.github.com/stevenroose/f56aa6d2a4d46ac06d7df48bff7a8fee
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12:26 < BlueMatt> stevenroose: thanks!
12:36 < BlueMatt> stevenroose: yea, I've got a st for you
12:36 < BlueMatt> stevenroose: for future reference, if you take the hex you have there and paste it into "extend_vec_from_hex" on fuzz/fuzz_targets/deser_net_msg.rs:391 (or equivalent in any other file) you'll see cd fuzz && cargo test blow up
12:37 < BlueMatt> stevenroose: I pasted the st on the PR
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15:37 < stevenroose> BlueMatt: that fuzzer is amazing! yeah I just add a deserialized varint to a u64 and they found an overflow. my bad, will fix. thanks for looking into it!
15:38 < BlueMatt> stevenroose: yep! they've saved me so many times (at least around overflows)
15:38 < BlueMatt> if it were for fuzzers you'd be able to make all kinds of routing hijacks in rust-lightning by making negative fees lol
15:40 < stevenroose> lol, yeah tbh if it wasn't for the fact that CompactBlocks have bitocin p2p messages, I would not have thought about adding a fuzz test. but this is kinda the first time they caught me red-handed making a bug :) so I might learn to appreciate them
15:42 < BlueMatt> yea, i mean they just pick the low-hanging fruit usually, but thats kinda what rust's all about - solve the stupid bugs that happen all the time and let you focus on making the thing work and avoid high-level bugs
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--- Log closed Thu Jul 16 00:00:22 2020