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Petr Tesařík

@ptesarik@infosec.exchange
mastodon 4.6.0-alpha.7+glitch

Linux kernel hacker.
Pronouns: he/him
0 Followers
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Joined April 29, 2025
BLOG:
https://sigillatum.tesarici.cz/
GITHUB:
https://github.com/ptesarik/

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Petr Tesařík
@ptesarik@infosec.exchange

Linux kernel hacker. Pronouns: he/him

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Petr Tesařík
Petr Tesařík
@ptesarik@infosec.exchange

Linux kernel hacker. Pronouns: he/him

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@ptesarik@infosec.exchange · Apr 01, 2026
@ljs @vbabka @ffmancera @hyeyoo Not until it's verified by a LLM. Ideally Grok.
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ptesarik
Petr Tesařík
@ptesarik@infosec.exchange

Linux kernel hacker. Pronouns: he/him

infosec.exchange
Petr Tesařík
Petr Tesařík
@ptesarik@infosec.exchange

Linux kernel hacker. Pronouns: he/him

infosec.exchange
@ptesarik@infosec.exchange · Apr 01, 2026
@nijel You may find it amusing that section titles in Solid Ground are still upside down today.
mastodon.social

Michal Čihař (@nijel@mastodon.social) - Mastodon

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@ptesarik@infosec.exchange

Linux kernel hacker. Pronouns: he/him

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Petr Tesařík
Petr Tesařík
@ptesarik@infosec.exchange

Linux kernel hacker. Pronouns: he/him

infosec.exchange
@ptesarik@infosec.exchange · Mar 25, 2026
@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
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Petr Tesařík
@ptesarik@infosec.exchange

Linux kernel hacker. Pronouns: he/him

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Petr Tesařík
Petr Tesařík
@ptesarik@infosec.exchange

Linux kernel hacker. Pronouns: he/him

infosec.exchange
@ptesarik@infosec.exchange · Mar 25, 2026
@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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Linux kernel hacker. Pronouns: he/him

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Petr Tesařík
Petr Tesařík
@ptesarik@infosec.exchange

Linux kernel hacker. Pronouns: he/him

infosec.exchange
@ptesarik@infosec.exchange · Mar 25, 2026
@oleksandr Please, yes, go fix cobbler to use a better tool for make test-debian12:
https://github.com/cobbler/cobbler
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@ptesarik@infosec.exchange

Linux kernel hacker. Pronouns: he/him

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Petr Tesařík
Petr Tesařík
@ptesarik@infosec.exchange

Linux kernel hacker. Pronouns: he/him

infosec.exchange
@ptesarik@infosec.exchange · Mar 25, 2026
@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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ptesarik
Petr Tesařík
@ptesarik@infosec.exchange

Linux kernel hacker. Pronouns: he/him

infosec.exchange
Petr Tesařík
Petr Tesařík
@ptesarik@infosec.exchange

Linux kernel hacker. Pronouns: he/him

infosec.exchange
@ptesarik@infosec.exchange · Mar 25, 2026
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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@ptesarik@infosec.exchange

Linux kernel hacker. Pronouns: he/him

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Petr Tesařík
Petr Tesařík
@ptesarik@infosec.exchange

Linux kernel hacker. Pronouns: he/him

infosec.exchange
@ptesarik@infosec.exchange · Dec 30, 2025
@mattblaze@federate.social @not2b@sfba.social If you ask me, this suggests that he acted on his own and wasn't part of an organized group. I don't know why I'm worried a lot of people will claim the opposite…
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@ptesarik@infosec.exchange

Linux kernel hacker. Pronouns: he/him

infosec.exchange
Petr Tesařík
Petr Tesařík
@ptesarik@infosec.exchange

Linux kernel hacker. Pronouns: he/him

infosec.exchange
@ptesarik@infosec.exchange · Dec 20, 2025
@mossyfoot Oh, don't get me wrong. It may be a fine browser. But since it builds on Mozilla code, new releases always appear with a delay, which also affects security fixes. I don't think the Waterfox team participates in the CRD (Coordinated Release Date). Depending on your use case, this downside may be acceptable or even irrelevant.
Besides, if enough AI shit goes into the core parts of Firefox (e.g. Gecko), undoing it in a clone will be more and more difficult. At some point, the Waterfox development team may have to give up.
Anyway, for the time being, the best option for me is still Firefox and configuration tweaks.
@Gargron
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Linux kernel hacker. Pronouns: he/him

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Petr Tesařík
@ptesarik@infosec.exchange

Linux kernel hacker. Pronouns: he/him

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@ptesarik@infosec.exchange · Dec 19, 2025
@mossyfoot Well, erm, I'm not sure it counts. It is always rebased on latest Mozilla code, and the team is not big enough to maintain it properly.
@Gargron
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@ptesarik@infosec.exchange

Linux kernel hacker. Pronouns: he/him

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Petr Tesařík
Petr Tesařík
@ptesarik@infosec.exchange

Linux kernel hacker. Pronouns: he/him

infosec.exchange
@ptesarik@infosec.exchange · Dec 19, 2025
@Gargron@mastodon.social I may not like Mozilla, but which non-Mozilla browser supports browser extensions on Android?
FWIW this is the reason I won't switch to Vivaldi.
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