James Morris
Posts
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James Morris
jmorris
@oshpark @kicad Now verified to work with the HMC doubler as expected. Thanks for making this possible! I plugged the laminate specs from your site into a couple of calculators and they were in close agreement, as are the test results. 4-layer is the next step. I'll publish the design & will be presenting the overall project at Microwave Update (MUD) in a couple of weeks.
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James Morris
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All Systems Go!
allsystemsgo@fosstodon.orgAll Systems Go! is almost here! Next Tuesday, Sept 30th, will kick off 2 days of talks and mingling around foundational user-space Linux technologies.
📆 Schedule is here ➡️ https://cfp.all-systems-go.io/all-systems-go-2025/schedule/
🎟️ Tickets are still available ➡️ https://ti.to/all-systems-go/all-systems-go-2025
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James Morris
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David Chisnall (*Now with 50% more sarcasm!*)
david_chisnall@infosec.exchange
Edited 3 months ago
Anyone going to be at SOSP in a couple of weeks? I will be giving a keynote at the KISV workshop on Monday morning about how CHERI changes how you think about OS design, and then we'll be presenting our paper on the CHERIoT RTOS first thing on Tuesday morning (and at the poster session).
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James Morris
jmorris
Did you know you can watch @KernelRecipes videos already by seeking in the live streams which are currently online?
https://www.youtube.com/@KernelRecipes/streams
https://www.youtube.com/@KernelRecipes/streams
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James Morris
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come see more at Hexacon!
https://www.hexacon.fr/conference/speakers/#cuda_de_grace
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James Morris
jmorris
Running make -j32 to build a kernel on my new work workstation. Takes about a minute, in total silence.
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James Morris
jmorris
@vilmibm people take it for granted now that you can just click on things, but it took decades for the idea to take hold & become ubiquitous. Most of it was utterly awful until the web came along.
RE: https://tiny.tilde.website/@vilmibm/115177383467463329
RE: https://tiny.tilde.website/@vilmibm/115177383467463329
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James Morris
jmorris
Edited 3 months ago
Interesting paper: "Enter, Exit, Page Fault, Leak: Testing Isolation Boundaries for Microarchitectural Leaks"
https://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. "
https://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
📢 🐧 The videos from LSS-EU 🇪🇺 2025 in Amsterdam 🇳🇱 are now up!
📺 Here is the playlist:
https://youtube.com/playlist?list=PLbzoR-pLrL6rSxIlgQx8OYw74Az63TpaB&si=6DEbDaY4GJMtIH1m
📺 Here is the playlist:
https://youtube.com/playlist?list=PLbzoR-pLrL6rSxIlgQx8OYw74Az63TpaB&si=6DEbDaY4GJMtIH1m
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