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Ryan Castellucci (they/them) 🎃 
@ryanc@infosec.exchange
mastodon 4.8.0-alpha.3+glitchHacker. Cryptography geek. Bureaucramancer. Ex-sysadmin. Nonbinary. Expat (US⮕UK).
By day I'm a Principal Security Engineer at a megacorp, by night I'm an agent of chaos. I post about technology and queer issues, while attempting to be funny along the way.
My continuing mission:
To explore strange new platforms.
To seek out new bugs and new software.
To boldly shitpost where no one has shitposted before!
I'm suing the UK for more gender, please help with my legal bills: https://enby.org.uk
@ryanc@infosec.exchange@justmytoots.com
#hacker #nonbinary #trans #embedded #linux #homelab #hardwareHacking #infosec
4577 Followers
1099 Following
50 Posts
Joined November 07, 2022
Pronouns:
they/them
Location:
London, UK
Website:
Github:
Bluesky:
Boosted by @trending@homestead.social
STOP DOING SWAP PARTITIONS
HARD DRIVES WERE NOT SUPPOSED TO ACT LIKE RAM
YEARS OF LINUX SYSADMINNING yet NO REAL-WORLD USE FOUND for going beyond CLOSING A FEW TABS
Wanted to avoid the OOM killer anyway for a laugh? We had a tool for that: It was called ZRAM
"Yes please give me a dedicated 64GB logical volume of SWAP. Please give me unresizable block devices trapped at the end of my disk." - STATEMENTS DREAMED UP BY THE UTTERLY DERANGED
LOOK at what Neckbeards have been demanding your Respect for all this time, with all the fdisk and GParted Live USBs we built for them. (This is REAL PARTITIONING, done by REAL LINUX USERS):
# mkswap /dev/nvme0n1p3
# echo /dev/nvme0n1p3 none swap sw 0 0 >> /etc/fstab
# swapon -a
"Hello I would like to torture my SSD's FTL because I left three Electron apps open."
They have played us for absolute fools.
#linux #sysadmin
This software is a work of fiction. Variable names, character codes, classes, and comments are products of the author's imagination or used ironically. Any resemblance to any actual code, interfaces, or programs, maintained or not, is entirely coincidental.
Boosted by @trending@homestead.social
Who is the joker who decided to return HTTP 418 (I'm a teapot) for attempts to buy tickets from Ryanair?
We interrupt your regularly scheduled tooting to bring you a message related to my employer, which I am not speaking on behalf of:
My team is hiring a security engineer in London. It is in person. Please DM if you'd like to talk about the role and perhaps be referred.
(please look me up on LinkedIn if you want to know where I work, but it's a megacorp you're familiar with)
Stuff for sale, boosts welcome, I can't be arsed to ship so exchange would need to take place at/near Liverpool Street station:
Ubiquiti US-16-XG (early hardware revision) with rack ears, functional, £250 - 8x SFP+ ports, 4x 10GBASE-T ports.
Netgear S3300-28X with rack ears, functional, modded with quieter fans, £80 - 24x 1000BASE-T ports, 2x SFP+ ports, 2x 10GBASE-T ports.
#homelab
OH: The existence of the common wall lizard implies the existence of the common wextra lizard and the common pedantic lizard.
resets the "days since Ryan has found a compiler bug" sign to "0"
Partner: I that a...
Partner: reaches into my pocket
Me: ...IEC C5/C14 cable? Yes.
Previously, I built something that detected LibreJS, bypassed its "trivial JavaScript only" gate for code without a free license, and played the free software song.
Chat, I have ordered a pumpkin spice beverage, is this a known side effect of estrogen?
Reading: Project Hail Mary. No spoilers please.
Why the fuck is Twitter trying to get me to sign up for a bank account with them?
So, I have run the numbers, and a PoE toaster running Linux is actually very feasible, and could be built for about £350.
It would need batteries, but at that price point it could have enough to make eight slices of toast.
cc @kajer@infosec.exchange
From HN: my threat model doesn't really include competent .us.gov actors.
Replying to
@ajn142@infosec.exchange @fil@hachyderm.io @neurovagrant@masto.deoan.org "cognitohazard" is a reasonable response to like half the stuff I post/boost tbh
Replying to
@JessTheUnstill@infosec.exchange I keep a bag of rubber bands around now for jars.
On the one hand, props to Kovid Goyal for fixing this quickly, on the other hand I'm a bit salty that he considers it not a security issue to be able to probe for file/directory existence and get back file sizes.
I included a PoC that lists the loaded kernel modules in my report.
https://github.com/kovidgoyal/kitty/commit/87ab3e98f4d399337777e4329960d7cd09101e99
Replying to
@charlotte@akko.chir.rs @NullTheFool@mastodon.gamedev.place Well, now I can't unpicture that. Fortunately I never used gnome.
Several hours of troubleshooting after work to discover that I was trying to run a board that expects to have 5V on 3.3V, just so it can run it through a 3.3V LDO regulator.
I should have a party at my lair.
Enumerate your loaded kernel modules with shell escape sequences (affects kitty):
https://bugs.debian.org/cgi-bin/bugreport.cgi?att=1;bug=1147733;filename=kitty_probe.py;msg=5
Replying to
@hakona@im.alstadheim.no It is not. In this instance, the optimizer was handling some very boring code badly. It was still "correct", just less efficient than it should have been.
I have also found bugs in libpcap's bpf compiler, and Safari's JavaScript JIT compiler.
In no instance was I looking for bugs.
Replying to
@Foritus@toot.dusepo.co.uk You're obligated to go, you realize?
Is there a registry for custom emoji in the unicode private use space like there is for conscripts?
Radxa says ROCK 5 ITX board I returned can't be repaired, and will be scrapped. They're refunding me, but I was counting on having two of them.
Anyone have a ROCK 5 ITX or ROCK 5 ITX+ they'd be willing to sell me for non-scalper prices?
Would also be happy to buy an Orion O6.
#embedded #embeddedsystems #linux #homelab
Replying to
@cassolotl@eldritch.cafe Hmm. I'm also on testosterone. This could be a problem.
I'm 99% sure this is a real email that is really from Microsoft.
Replying to
@brouhaha@mastodon.social go for it
Replying to
@Kerplunk@mastodon.scot My dude, it is a copypasta snowclone shitpost.
https://knowyourmeme.com/memes/stop-doing-math
Replying to
@sudothei@infosec.exchange @hyrulian@tech.lgbt fucking SATA power cables with the 12V and 5V wires swapped 🤬
I got a second Pinecil V2, and now I can hold them like chopsticks to remove surface mount passives.
Replying to
@kajer@infosec.exchange @Epic_Null@infosec.exchange I spec'd out a version with a 300Wh battery, this would take about 5 hours to charge at 60W, 10 hours to charge at 30W, or 20 hours to charge at 15W.
Replying to
@drscriptt@oldbytes.space Other way around.
Plugs into a C13 socket (PDU) on the source side and a C6 socket on the load side.
@tqbf@infosec.exchange I'm not sure if you read your mentions here, but if you listed 2010 as a copyright year on your website as a way to troll people with extreme pattern matching brain you did a fantastic job
Replying to
Replying to
@whitequark@social.treehouse.systems @hughsie@mastodon.social sometimes a shotgun parser is the least worst option, typically by being the only option
Replying to
Replying to
@bob_zim@infosec.exchange the common ffast-math lizard?
Replying to
@undead@masto.hackers.town It's escaped as octal.
Looks like the defective Radxa ROCK 5 ITX board I sent back to China a month ago is finally being delivered to the manufacturer today.
Replying to
@sackofbones@kolektiva.social The premise was bad and needed mocking. I don't think I ever publicly published that code.
Replying to
@SiteRelEnby@transfem.social @whitequark@social.treehouse.systems Amtrak (aside from the Eastern seaboard) would like a word.
Replying to
@simonzerafa@infosec.exchange @attie@hachyderm.io wealthy people use investment accounts with margin lines of credit, bank account interest rates don't matter
Replying to
What DNS caching stub resolver is the least tire-fire-esque?
Replying to
@simonzerafa@infosec.exchange @attie@hachyderm.io there are lots of stupid wealthy people, to be fair
Replying to
@simonzerafa@infosec.exchange @attie@hachyderm.io why would high net worth people use revolute?