Posts
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Following
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Followers
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Linux Kernel security developer, working for Microsoft. Also W7TXT. Views are my own.
Topics: #Linux #kernel #security, #amateurradio, #RF, #hamradio, #electronics, #science, #radioastronomy, #physics, #space, #arduino.

📡 https://w7txt.net/
🐧 https://blog.namei.org/
☠️ https://www.facebook.com/w7txt
jmorris
repeated
oshwassociation@mastodon.social

OSHWA

At the beginning of this month we wrapped up OSHWA’s first ever Open Healthware Conference. For two days we got to hear from incredible creators within the Open Healthware community, see demos of devices meant to better the medical world, and meet new folks from the community.

It was incredible! We can’t say thank you enough but we can try! From NSF, to speakers, to in person and online attendees - thank you, thank you, thank you!!

https://oshwa.org/announcements/open-healthware-conference-wrap-up/

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jmorris

James Morris

Reply to @oshpark@fosstodon.org
@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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jmorris

James Morris

Reply to @jmorris
@kicad @oshpark and the drop-off around 18 GHz could also be significantly due to the connectors, which are rated to 18 GHz. To get better results, I'd need to go to 4-layer FR4 (where the top layer is very thin), or microwave laminates (expensive).
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jmorris

James Morris

Reply to @jmorris
@kicad @oshpark amazingly, the 0.8mm FR4 material works very far out of its expected range, and is useful up to ~16 GHz with acceptable loss & SWR for my hacking purposes.
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jmorris

James Morris

Reply to @n8dmt@mastodon.radio
@n8dmt it should work really well, the input range is 4.5 to 8 GHz officially, but it likely does more. This is indeed to extend my Kuhne 13.4 GHz synth up to about 18 GHz.
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jmorris
repeated
allsystemsgo@fosstodon.org

All Systems Go!

All 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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jmorris

James Morris

Reply to @amarsaar@infosec.exchange
@amarsaar their site seems broken: "Error code: SSL_ERROR_RX_RECORD_TOO_LONG"
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jmorris
repeated
david_chisnall@infosec.exchange

David Chisnall (*Now with 50% more sarcasm!*)

Edited 8 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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jmorris

James Morris

Reply to @bluca@fosstodon.org
@bluca French police were doing similar on a train to Paris, just after leaving... Marseille! I took a photo of this and they confronted me about it, but were friendly after they heard my accent.
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jmorris

James Morris

Reply to @jmorris
Boards arrived from @oshpark -- next step, soldering.


@kicad
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jmorris

James Morris

Reply to @lucasarts_places@mastodon.social
@lucasarts_places did gaming ever get more fun than this?
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jmorris

James Morris

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
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jmorris

James Morris

Reply to @robpike@hachyderm.io
@robpike @timbray speaking of aged ears, one of the ironies in all of this is finally being able to afford a decent audio system after decades of work only to realize your ears are now kind of crap.
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jmorris
repeated
chompie1337@haunted.computer

chompie

Reply to @chompie1337@haunted.computer

come see more at Hexacon!
https://www.hexacon.fr/conference/speakers/#cuda_de_grace

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jmorris

James Morris

Running make -j32 to build a kernel on my new work workstation. Takes about a minute, in total silence.
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jmorris

James Morris

Reply to @PE4KH@mastodon.radio
@PE4KH we're thinking possibly ship scatter more generally, should work for container ships etc.
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jmorris

James Morris

@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
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jmorris

James Morris

Edited 8 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. "
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jmorris
repeated
LinuxSecSummit

Linux Security Summit 🐧

📢 🐧 The videos from LSS-EU 🇪🇺 2025 in Amsterdam 🇳🇱 are now up!

📺 Here is the playlist:

https://youtube.com/playlist?list=PLbzoR-pLrL6rSxIlgQx8OYw74Az63TpaB&si=6DEbDaY4GJMtIH1m
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jmorris

James Morris

Reply to @fustini
@fustini @kicad feel free to point out any issues if you see them.
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