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James Morris
jmorris
RE: https://tiny.tilde.website/@vilmibm/115177383467463329
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James Morris
jmorrishttps://www.microsoft.com/en-us/research/publication/enter-exit-page-fault-leak-testing-isolation-boundaries-for-microarchitectural-leaks/
"We found 4 new cross-domain leaks, successfully detected all 6 known leaks possible in the configurations that we tested and reproduced 6 known flaws in patches."
e.g.:
"We discovered a microarchitectural effect on AMD3 that allows an attacker VM to selectively infer any bit from the memory of another VM, provided the victim VM has previously accessed (i.e., cached) this bit. By repeatedly exploiting this effect, the attacker VM could read the victim’s memory one bit at a time, and thus learn the contents of an arbitrary memory range used by the victim. "
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Linux Security Summit 🐧
LinuxSecSummit📺 Here is the playlist:
https://youtube.com/playlist?list=PLbzoR-pLrL6rSxIlgQx8OYw74Az63TpaB&si=6DEbDaY4GJMtIH1m
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Lennart Poettering
pid_eins@mastodon.social4️⃣9️⃣ Here's the 49th post highlighting key new features of the upcoming v258 release of systemd. #systemd258
One of the key features of systemd from day 1 on is socket activation, i.e. a mechanism where systemd binds sockets on behalf of services, watches them and only activates the services themselves later, possibly only at the moment they are actively used.
This has various benefits, for example reduces ahead of time cost of running a large number of services (which improves boot times).
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All Systems Go!
allsystemsgo@fosstodon.org📣 Reminder: Ticket prices go up in a few days for All Systems Go! 2025, the foundational user-space Linux technologies event in Berlin.
🎟️ Get yours today @ https://ti.to/all-systems-go/all-systems-go-2025
ℹ️ And more info @ https://all-systems-go.io/
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Linux Security Summit 🐧
LinuxSecSummithttps://lsseu2025.sched.com/list/simple
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James Morris
jmorris
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James Morris
jmorris
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Mickaël Salaün
l0kod@mastodon.socialAI agents can potentially gain extensive access to user data, and even write or execute arbitrary code.
OpenAI Codex CLI uses #Landlock sandboxing to reduce the risk of buggy or malicious commands: https://github.com/openai/codex/pull/763
For now, it only blocks arbitrary file changes, but there’s room to strengthen protections further, and the ongoing rewrite in #Rust will help: https://github.com/openai/codex/pull/629
Landlock is designed for exactly this kind of use case, providing unprivileged and flexible access control.
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