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Petr Tesařík

@ptesarik@infosec.exchange
mastodon 4.8.0-alpha.3+glitch
  • Open on infosec.exchange

Linux kernel hacker.
Pronouns: he/him

279 Followers
148 Following
50 Posts
Joined April 29, 2025
BLOG:
https://sigillatum.tesarici.cz/
GITHUB:
https://github.com/ptesarik/
Open post
Petr Tesařík @ptesarik@infosec.exchange
· 1w ago
Replying to
@mattblaze@federate.social @grumble209@kolektiva.social Absolutely. Once safely in the castle, pull up the drawbridge.
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 1w ago
Not bad after some 13 hours. https://lnkd.in/p/dAPgeunn
lnkd.in
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 2mo ago
Ugh, I completely forgot to boast that my latest cleanup patch makes the kernel a tiny bit smaller again: 3 files changed, 17 insertions(+), 32 deletions(-) But other folks keep adding lines. 😠 We need more volunteers for #MKSA! https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-let-node_reclaim-return-the-number-of-pages-reclaimed.patch
git.kernel.org
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 2mo ago
Replying to
@ljs@mastodonapp.uk Talking of British legal requirements, after all those years, I still think this is the best illustration of British values. @vbabka@mastodon.social @monsieuricon@social.kernel.org
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 2mo ago
Replying to
@gloriouscow@oldbytes.space You can improve the efficiency by writing a decompressor for a custom compression scheme that uses all emojis. Just saying.
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 1mo ago
Replying to
@flyingsaceur@ioc.exchange z/OS on a z196 in a university computer room
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 3mo ago
Replying to
@vbabka@mastodon.social @wagi@mastodon.social @cainlee@toot.community @ljs@mastodonapp.uk Man, I even contributed #Itanium assembly code to the kernel. When it was still a thing, that is. But what good is knowing stuff that shouldn't be?
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 3mo ago
Replying to
@ljs@mastodonapp.uk Yes, sir, my pleasure to ruin your day. Follow me on Mastodon to have more of your days ruined. Hail Satan! @wagi@mastodon.social
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 2mo ago
Replying to
@ffmancera@mastodon.social @vbabka@mastodon.social Don't be shy. Remove it while it's impossible. If you find a way to sneak in the removal, people will remember you forever as “the guy who broke the Internet”.
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 2mo ago
Replying to
@lkundrak@metalhead.club @ljs@mastodonapp.uk Hail the armed Satan!
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 3mo ago
Replying to
@cainlee@toot.community Thank you for confirmation. I have always had that dark suspicion I was a mere imposter. @ljs@mastodonapp.uk @wagi@mastodon.social
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 3mo ago
Replying to
@ljs@mastodonapp.uk Yeah, for example, Arsenal could lose a match to Tottenham 12:0. @wagi@mastodon.social
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 2mo ago
Replying to
@ftranschel@norden.social @mfeilner@mastodon.social Hm, when investors ask about percentage of AI-generated code now, how is that metric used? Higher is better, or lower is better?
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 2mo ago
Replying to
@ljs@mastodonapp.uk I have the impression that there is a word for “consistent bad luck”. Something with Satan?
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 3mo ago
Replying to
@wagi@mastodon.social Sir, may you sign your left foot only. Leave your right foot unsigned. @ljs@mastodonapp.uk @cainlee@toot.community
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 2mo ago
Replying to
@gloriouscow@oldbytes.space Yeah, my suggestion was meant for emojiDOOM, not for a 512-byte demo.
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 3mo ago
Replying to
@ljs@mastodonapp.uk Give him a MM maintenance job; then he'll have no rest. Finally or temporarily… @lkundrak@metalhead.club @vbabka@mastodon.social @liskin@genserver.social
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 4mo ago
Replying to
@brezelradar@norden.social @jernej__s@infosec.exchange @CauseOfBSOD@wetdry.world @joe@f.duriansoftware.com Has anyone tried Follow /proc/self/fd/0 for instructions?
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 7mo ago
Replying to
@etchedpixels Bug bounties? You know nothing about business… You set up a giant scam tool, let venture capital pay for its development, then use it to hack the world and sell all of it: license use of the tool,hacking applications,vulnerability scanning,protection racket from affected companies. That' how real capitalists do business. The tool is called Claude. @GossiTheDog
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 3mo ago
Replying to
@Em0nM4stodon@infosec.exchange I like the sentiment, but really, STOP USING greed-powered social media.
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 6mo ago
Replying to
@ljs @vbabka @ffmancera @hyeyoo Not until it's verified by a LLM. Ideally Grok.
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 5mo ago
Replying to
@passwordsarehard4 @Reinald @jwildeboer I'm not trying to say capitalism is better than what it is. But I've seen what socialism can give and what the costs are, it doesn't work. Hell, it has all the flaws of capitalism and some more. I can compare, because I've seen both socialism and capitalism.
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 5mo ago
Replying to
@jwildeboer@social.wildeboer.net Ach ja, es gibt immer welche Klassenverräter. @larsmb@mastodon.online
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 5mo ago
Replying to
@lkundrak@metalhead.club @ljs@mastodonapp.uk Actually, no. Drugs is what can keep you going for the first couple of days, but they also make you so exhausted on day 3. Day 3 is the big mystery.
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 6mo ago
Replying to
@ljs@mastodonapp.uk @jani@floss.social @kees@hachyderm.io @vbabka@mastodon.social Ugh, why is this still written in Perl? Why didn't someone rewrite it in—I don't know—Brainfuck?
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 5mo ago
Replying to

@hyeyoo@social.kernel.org @axboe@fosstodon.org @ljs@mastodonapp.uk @vbabka@mastodon.social @gregkh@social.kernel.org @Aissen@social.treehouse.systems But it's adding a dominance signal!

Signal Standard Action Comment ─────────────────────────────────────────────────── SIGDOMINANCE Instinct Shriek Social dominance. Chest-drumming may be also accepted in some domains.

*** SHRIEK! ***

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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 5mo ago
Replying to
@Reinald @jwildeboer Yes, in theory. As someone who grew up in a centrally planned economy, I'm doubtful that the society can do much better than capitalism.
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 4mo ago

I feel sorry for our fellows at #RedHat.

https://socket.dev/blog/mini-shai-hulud-campaign-hits-red-hat-cloud-services-npm-packages

infosec.exchange
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 6mo ago

If your firewall starts behaving strangely after installing #docker on #opensuse #slowroll, the reason is that firewalld has switched to nft, but docker still uses iptables. You may have to install iptables (the CLI tool) to fix the damage.

infosec.exchange

Infosec Exchange

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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 8mo ago
Replying to
falls off the tree FUCK! Don't fuck with @ljs@bogo @vbabka @lkundrak @vegard
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 6mo ago
Replying to
@oleksandr Please, yes, go fix cobbler to use a better tool for make test-debian12: https://github.com/cobbler/cobbler
GitHub

GitHub - cobbler/cobbler: Cobbler is a versatile Linux deployment server

Cobbler is a versatile Linux deployment server. Contribute to cobbler/cobbler development by creating an account on GitHub.

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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 6mo ago
Replying to
@ffmancera No idea. All I know is that packets were no longer forwarded through my default (NAT) libvirt network, and it took me way too long to find out that docker installation/startup did the equivalent of iptables -P FORWARD DROP. It was not visible anywhere in the output of nft list ruleset.
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 7mo ago
Replying to
@Amorpheus@kind.social Wait! What do you call “consumption”? For me, it's: potable water,potatoes, rice, flour, eggs, milk, …electricity,clothes,etc. I don't see how these things are substituted by a book. 🤷 @Daojoan@mastodon.social
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 7mo ago
Replying to
@pchestek@fosstodon.org I was about to write something similar. Nobody wants to read slop, and if anybody actually does, they're not the kind of readers you'd win with factual writing anyway.
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 8mo ago
Replying to

@ljs

*** SHRIEK! ***

@bogo @vbabka @lkundrak @vegard

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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 2mo ago
Replying to
@ljs@mastodonapp.uk LLMs may replace programmers in fact, but programming itself will never be the same. Forget about any kind of determinism, just random slop everywhere, and future generations will not even know that it needn't be…
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 2mo ago
Let's get one thing clear: If social platforms wanted to protect children from abuse, they could have done it anytime in the last decade. No new laws are necessary. If they can build a buyer's profile and link it to a real person, they must definitely know which users of theirs are very likely to buy child #porn. We must therefore assume that it is simply more profitable to sell the information to those who can offer such products than it is to block potential buyers and report them to the authorities.
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 5mo ago
Replying to
@larsmb@mastodon.online Fehlende Solidarität in IT? Nein, daran kann es nicht liegen. Also ja, bei uns in CZ haben wir bisher nur ein bisschen über 10 % der Belegschaft gewerkschaftlich organisiert, aber Solidarität stellt niemand in Frage. @jwildeboer@social.wildeboer.net
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 4mo ago
Replying to
@Steve@social.coop @benlockwood@ecoevo.social The mere existence of a union lowers investor interest in the company, thus also the value of restricted stock. That's even more important than the next quarterly earnings report, because it dips straight into the top managers' pockets.
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 3mo ago
Replying to
@zynaesthesie@mastodon.social @ZDL@mstdn.social @stux@mstdn.social This freedom? https://freedom.gov/
freedom.gov
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 5mo ago
Replying to
@shsbxheb @passwordsarehard4 @Reinald @jwildeboer The main reason socialism failed is that it wasn't designed to work with actual human beings, their greed and other bad qualities. So far, I have seen no system that would work well with real people. But hey, I'm open to new ideas. Please, give me a link to your proposed solution!
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 6mo ago
Replying to
@liskin@genserver.social By now, docker has left my system and will never make a comeback. But why did nobody warn me before I broke my system? Besides, why didn't the #opensuse docker package revert those changes to iptables at unistall time?
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 5mo ago
Replying to
@ljs@mastodonapp.uk BREAKING! Fish have brains. @lkundrak@metalhead.club
en.wikipedia.org
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 2mo ago
Replying to
@ftranschel@norden.social @mfeilner@mastodon.social I wish it were only parts per million…
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Petr Tesařík @ptesarik@infosec.exchange
· 2mo ago
Replying to
@ljs@mastodonapp.uk Gee, best news of the year!
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 2mo ago
Replying to
@gloriouscow@oldbytes.space My brain continued thinking about the term you were looking for. I think you can express it with the inverse concept: The emoji encoding has a high redundancy.
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 5mo ago
Replying to
@Reinald @shsbxheb @passwordsarehard4 Where? Your toots are too generic for me. Provide some resources, please!
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Petr Tesařík @ptesarik@infosec.exchange
· 5mo ago
Replying to
@ashwin@defcon.social Which itself is mostly a statistical artifact… https://www.janmagnus.nl/papers/dunning-kruger.pdf @essjayjay@tech.lgbt @ebel@moytura.org
janmagnus.nl
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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 6mo ago
Replying to
@liskin@genserver.social It's complicated. Short answer: Yes, libvirt can work just fine with nft. Long answer: Read this: https://libvirt.org/firewall.html
libvirt.org

libvirt: Firewall and network filtering in libvirt

libvirt, virtualization, virtualization API

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Open post
Petr Tesařík @ptesarik@infosec.exchange
· 6mo ago

@nijel@mastodon.social You may find it amusing that section titles in Solid Ground are still upside down today.

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