Watched Clifford Stoll's Defcon talk last night; he's wonderfully insane and animated enough to probably cause the camera operator nightmares.
I read his original book on this back when it came out around 89/90, just as I was learning Unix
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penguin42
@penguin42@mastodon.org.uk
mastodon 4.7.3Chocolate eating computer geek, Manchester, UK
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797 Followers
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Joined April 12, 2017
Chocolate:
Very dark
OS:
Linux
Cake:
More!
Education:
PhD computer science
Got one of my Sun3's open - no life yet - but they don't look too bad; look at that BBC Engineering sticker; and they're neighbouring serial numbers on the machines - these are siblings! Few fun board bodges.
#retrocomputing #suntember
Got myself a selection of small resistors for making dummy load for a PSU, and a few more random ones - don't see the silver band much!
(I've got to say Rapid electronics in the UK was - ordered just before 4pm yesterday,delivered before 2pm today on standard delivery).
UK currently exporting more than we're fossil-fuel generating.
(Thanks to grid.iamkate.com)
Replying to
@dragonarchitect@rubber.social @azonenberg@ioc.exchange Hmm maybe one of @revk@toot.me.uk 's - I know he had a door sign with e-ink and an ESP, not sure if he does colour.
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@TimWardCam@c.im Oh sure; but i guess the question is whether they're pushing their team to ask the right questions and to ask if the organisation of NATS as a whole is correct to make sure it happens.
a race condition: Preliminary NATS report on the outage that took out UK air traffic control for a few hours - they had a race condition of some type where a higher priority task triggering during a normal squawk code allocation caused a corruption and it gently fell to bits over a few hours.
Full report ~month or so; prelim report:
https://www.nats.aero/wp-content/uploads/2026/09/NATS-Preliminary-Investigation-Report-into-NAS-Incident-on-08-Sept-2026-Issued-16-Sept-2026.pdf
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Huh, it's the right way around on Cheese, but flipped on Kamoso - I think this is it deciding that a face camera should be flipped; hmm I bet there's a USB descriptor somewhere for that.
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@760ceb3b9c0ba4872cadf3ce35a7a4@wetdry.world hmm, now if you could run the power over the rings and do something to select the current page, you could avoid having to replug it each time
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@whitequark@social.treehouse.systems @lina@vt.social I think you're missing just how big a surge in valid security reports have happened in a few months; people can't suddenly magic up fixes that much more quickly.
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@yrabbit@mastodon.sdf.org My understanding is it's mostly irrelevant, but there is a mux needed to route some stuff (the usb2?) in the right direction so it needs to know the orientation - I don't think there's a software reason to know it?
(and I have heard of miswired devices where the orientation does make a difference when they forgot to wire one copy of the usb2 wires I think).
Now the fun idea is libpam-usb-direction to only allow you to login if you plugged your key in the right way up :-)
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@mikemcquaid@mastodon.social Yeh and (when I worked) i did; but it can be tricky; certainly it's worth checking you can legally just do 'No paperwork' - otherwise you can get the project you contribute to into trouble.
Toolstation sell M5 bolts in 25 or 30 packs; they sell the nuts in 100 packs. Grrr.
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@robparsons@mastodon.social Well you could have looked at his stopping any clean-air charges in manchester, or his building of a large gas cogeneration scheme in the city centre (we've got a nice modern art chimney for it).
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@b0rk@social.jvns.ca I think posting stuff that works is important, there are still people who think it's completely useless. You will get pushback but be honest what works and what doesn't
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@captainblack@hachyderm.io When doing my postgrad I used a Psion 3a actually (the Acorn branded version of it), for taking notes in the library. It was absolutely great for that.
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@mikemcquaid@mastodon.social You have to be careful in some big companies, they claim copyright to everything you do and explicitly disallow stuff in contract.
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@poleguy@mastodon.social @GossiTheDog@cyberplace.social Well that's why I asked, I thought SHA-256 was still hard to break, and it's described as SHA-256 with a salt, which should have made table based thing a little harder.
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@GossiTheDog@cyberplace.social What was wrong with the SHA-256+salt that made it breakable; I'd assumed sha-256 was hard enough to replicate?
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@f4grx@chaos.social @whitequark@social.treehouse.systems @lina@vt.social Sure they can, and they probably have, but it takes people a while to get upto speed; this is a sudden bucket full of reports landing on peoples projects.
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@b0rk@social.jvns.ca Sure; we're still figuring that out; and there's a big continuum, of what people feel happy with doing with it. But the way to figure it out is for people to share experiences of what works and especially where it breaks unexpectedly.
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@b0rk@social.jvns.ca Of course, people should use what they want - but it's the same that people who are using LLMs and finding them useful being shouted down by people who don't understand they can be used sanely if people take care.
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@kboyd@phpc.social @dantheclamman@scicomm.xyz Hmm well then maybe another would be to distinguish between different species of oysters - can you get rid of the invasive oysters with some lighting?
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@globalc@chaos.social md5sum of /dev/urandom may be asking for a lot of entropy from virt-rng?? I can't think what else it would be doing in qemu - easy enough to find with 'perf' on the host. 'perf kvm' may also be of use; you can trace events in the guest - although I don't think anything more useful. To pass a USB device, I'd use virt-manager to set up the USB passing; easiest way used to be spice but that's possibly gone, but there are other mechanisms; or you could pass serial.
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@globalc@chaos.social IMHO the best solution is a differential case - measure the power without the process, then measure with it.
I love that there's a Linux /sys file where you can tell which way up your USB-C connector is. Anyone know of anything that displays all that type of thing? Connector, USB mode, power delivery, etc etc?
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@globalc@chaos.social Hmm, then you're somehow going to have to work out how to measure the power to put into your emulated device. I think the opposite might be easier; using 'perf kvm' or 'perf' on the host you should be able to get event information from the guest kernel about when the scheduler does stuff. Or even something simpler; like taking the output of a 'top' like thing in the guest to the host; then you're telling the host that a particular guest prog is using 23% of CPU.
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@globalc@chaos.social My gut feeling is that having the guest tell the host the information letting the host do the calculation will work out easier.
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@globalc@chaos.social Oh, I thought you were trying to pass your power monitor thing through; if you want something in the guest that looks like a serial almost, but connects to something on the host, then try the 'add serial' or 'add channel' - those both give you options of what to connect to, e.g. a host pty or host unix socket; then you can run whatever you like on those.
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@StripeyYena@chaosfurs.social Does the 'empty' marking come from personal experience, regulation, general good practice, or just appropriate paranoia?
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@StripeyYena@chaosfurs.social Is that something like silver loaded glue?
I wonder what's so special about the wire - gold plated copper connectors are pretty normal.
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@deFractal@infosec.exchange @syphist@zoner.work @vogelchr@chaos.social @faheus@chaos.social *maybe* I think the article was showing two separate interfaces on the host, so they really might be separate.
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@Edent@mastodon.social Wow it's amazing how many chocolate contracts the government and universities have. (Looks like Univ of York have a full chocolate manufacturing line as well - which makes some sense)
https://www.contractsfinder.service.gov.uk/notice/8f4be5e7-154e-452e-be1f-a0b94bf1e15c?origin=SearchResults&p=1
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@deFractal@infosec.exchange @syphist@zoner.work @vogelchr@chaos.social @faheus@chaos.social Or perhaps car-to-car on the same charger?
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@jonobennett@mastodon.me.uk @christianp@mathstodon.xyz Yes, I just wish people would use 'faster' or 'more efficient' instead.
#radio4 Does anyone know when Droitwich itself is being switched off - I heard it's 30th - but when?
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@whyrlpool@slime.global Yeh I'd assume it would need to be a proper switch with deserialisation and buffering and routing and all that fun.
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@globalc@chaos.social Passing USB device throguh, rather than serial specific should be easy; method 1) In virtmanager hit Add Hardware, select 'USB Host device' and select your USB serial converter. That's it! 2) Use the virt-manager 'Virtual Machine->Redirect USB device' option.
(I could swear there's a 3rd option somewhere!) For both make sure the VM already has an emulated USB.
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@TimWardCam@c.im Yeh; I guess it depends how the boss responds and whether they're doing everything they could - have they got static analysis and AIs trying to spot problems? Was this failure really 'safe' or could that corruption have taken out something more subtly/dangerously?
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@whyrlpool@slime.global Yes please! Something that could do fullspeed Thunderbolt 4 on each port, and a few ports would make a nice cluster