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Dark Matter: The Situation Has Changed
Science News, Physics, Science, Philosophy, Philosophy of Science
New
The latest blog posts to take off on Hacker News. 3,497 posts.
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Apple Silicon Hardware: SPRR and Guarded Exception Levels (GXF)
Over a year ago siguza published a write-up about Apple’s APRR - a custom ARM extension that redefines pagetable permissions and protects certain parts of the kernel from itself. Since then Apple has released their M1 chip which not only features an updated version of APRR but also easily allows to run bare-metal code…
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Where the top of the stack is on x86 (2011)
I've noticed more than once that some programmers are confused about the direction in which the stack grows on x86, and what "top of the stack" and "bottom of the stack" mean. It appears that this confusion is caused by a basic mismatch in the way people are used to thinking about stacks, and in the way the stack on…
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Java's records, Lombok's data, and Kotlin's data classes
While all three remove boilerplate, the similarities don't go much further. Records have stronger semantics with important downstream benefits, which makes them better*. (* not always; depends on circumstances; excuse the clickbait)
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A unified theory of low/no code and middleware
Let’s start from the beginning — what is an application?
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How to survive a toxic workplace and how to avoid creating one
Inspired by a two minute video about how the Navy Seals does it
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Hardening macOS (2018)
Quick and easy guide for securing macOS systems, for both laymen and security enthusiasts. Last updated for Golden Gate.
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I Hacked Google App Engine: Anatomy of a Java Bytecode Exploit
Back in college, I was very interested in Java bytecode. When I got an internship at Google in 2013, I was skeptical of the security of the Java version of Google App Engine and got permission to spend the last week of my internship doing a mini red team exercise, trying to break into App Engine. This is the story of…
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1988: P.R.E.S.T.A.V.B.A.
In communist Czechoslovakia, a network of teenage hackers discovers that text games are a completely uncensored medium.
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I spent some time exploring how to improve the UX of code blocks on the web
Challenging the UX of code blocks.
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Why I Work on Ads
"I work on ads at Google" "Can I ask why? I honestly can't understand how anyone could." Someone recently asked me why I work on ads, and I wanted to write up something more thorough than my comment. (Despite being a work topic this is a personal post and I'm speaking only for myself.) One answer is that I'm earning…
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How to Teach Math?
The only way to learn mathematics is to do mathematics—Paul Halmos Angie Hodge is an Associate Professor of mathematics at Northern Arizona University. Her interests as stated on her website …
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UFOs shows government competence as either surprisingly high or low
Sometimes I pride myself on my taking an intellectual strategy of tackling neglected important questions.
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Why What3Words is not suitable for safety critical applications
What3Words is a widely promoted system that is used for sharing a location using just three words. For example, ///wedge.drill.mess is located in Hyde Park.The globe is divided into 3m squares, eac…
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The California Exception
You know how I linked to that New York Times editorial pleading for regulation of dark patterns? Turns out I missed something in the Times’ convoluted cancellation policies. They give you the choice of speaking with someone over the telephone or speaking with someone using an instant messenger. Both have similar hours…
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Six years of professional Clojure development
Over the last couple of years me and my colleagues here at doctronic have been busy creating and maintaining more than a dozen of individual software systems for our clients.
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HTML Tips (2020)
20 HTML tips with examples: mailto and tel links, opening links in a new tab, lazy loading, a native accordion, range sliders, download links and more.
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Why has nuclear power been a flop?
Nuclear is expensive, but it should be cheap
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Threaded Code (1999)
What is threaded code? What is it good for? What are the differences between the various threading techniques? How do I implement threaded code portably? How fast are various threading techniques?
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SeL4 on RISC-V Verified to Binary Code
… and seL4 and RISC-V Foundations form an alliance In June 2020 we announced that the seL4 microkernel, the world’s first operating system (OS) kernel with a machine-checked proof of implemen…
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Generating more interesting image previews using imagemagick
A couple of tries at generating more interesting image previews using imagemagick with the mini_magick gem.