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A buffer overflow in the XNU kernel
XNU kernel buffer overflow, introduced in macOS 14.0 and fixed in macOS 14.5.
New
The latest blog posts to take off on Hacker News. 6,945 posts.
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Lessons Learned from Scaling to Multi-Terabyte Datasets
This post is meant to guide you through some of the lessons I’ve learned while working with multi-terabyte datasets. The lessons shared are focused on what someone may face as the size of the…
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Agilent 2000a / 3000a Oscilloscope NAND Recovery
As a resident member of the EEVblog Test Equipment Anonymous support group, I have picked up my fair share of old test equipment boat anchors, but my knees buckle at broken recently manufactured oscilloscopes in the sub $200 range. In this case, the Agilent / Keysight Infiniivision X-series oscilloscopes have been an…
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IPC in Rust – A Ping Pong Comparison
I wanted to explore different ways of communicating between different processes executing on the same machine, and doing so as fast as possible. We're focussing on high speed inter-process communication (IPC), but some of these approaches can be extended across a network. We'll do this exploration in Rust.
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When are SSDs slow?
CedarDB is a database system that delivers unmatched performance for transactions and analytics, from small writes to handling billions of rows. Built on cutting-edge research to power today’s tools and tomorrow’s challenges.
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FPGA-Based Disk Controller for the Apple II (2017)
Apple II disk controller cards are weird, there are a crazy number of different types , and many are rare and expensive. Can an FPGA-based solution save the day for retro collectors? You bet! Nearly all the existing disk controllers connect the same 8-bit bus to the same 19-pin disk interface, so a universal clone is…
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OpenBSD, the computer appliance maker's secret weapon
Between our ESP32 prokaryotic organisms and our 24/7 Internet-enabled megafauna servers, there exists a vast and loosely-defined ecosystem of things the B2B world likes to call computer appliances. Picture a bespoke Pi 4 packaged up neatly with some Python scripts, a little fancy plastic embossing, and maybe a…
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Making my first embedded Linux system
End-to-end documentation of a journey from no PCB experience to fabricating my own Linux-ready system that can boot the latest mainline kernel. This article is the recommended reading for someone building their first embedded Linux board. F1C100s SoC is used for this sample board.
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Reformatting 100k Files at Google in 2011
Laurent Le Brun's blog
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Address Sanitizer Internals
Going in depth into the Address Sanitizer internals.
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MLow: Meta's low bitrate audio codec
At Meta, we support real-time communication (RTC) for billions of people through our apps, including WhatsApp, Instagram, and Messenger. We are working to make RTC accessible by providing a high-q…
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ChromeOS will soon be developed on large portions of the Android stack
ChromeOS will soon be developed on large portions of the Android stack to bring Google AI, innovations, and features faster to users.Over the last 13 years, we’ve evolve…
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Serious Sam handled massive amounts of enemies on 56k modem connections
An analysis of the Croatian classic.
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How to get the most out of Postgres memory settings
Engineering deep-dives, product updates, and company news from Tembo — the platform for running coding agents across your stack.
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SIMD < SIMT < SMT: Parallelism in Nvidia GPUs (2011)
Programmable NVIDIA GPUs are very inspiring to hardware geeks, proving that processors with an original, incompatible programming model can become widely used.
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Finding out where syscalls are called from: Stack traces with strace
One of the great strengths of strace as a debugging tool is that it shows you what a program is doing regardless of whether it was compiled with debug info or not. The downside of this is that you …
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Anti-patterns in event-driven architecture
Event-driven architecture is great, but it can cause a lot of headaches if it is used for the wrong purpose.
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Compilers are too smart
Last week I noticed some unexpected assembly code in a function calling std::unordered_map::find (yes, I know, friends don’t let friends use STL, but that is a topic for another discussion). I decided to investigate a bit and it turned out to be quite a journey. It was a Clang compiler, ARM-based platform, I will use…
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Alarms in medical equipment
ISO/IEC 60601-1-8, Patterson and other alarms in medical equipment Sample Alarm Sounds - Sirens, buzzers and other sounds
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Inline Assembly Dangers
Resolving PS2SDK Soft Reset Issues
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Saving Three Months of Latency with a Single OpenTelemetry Trace
Discover how OpenTelemetry tracing and Coralogix analysis resolve latency issues, proving observability's role in enhancing system performance and reliability.
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Understanding QEMU Devices (2018)
Here are some notes that may help newcomers understand what is actually happening with QEMU devices:
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We improved the performance of a userspace TCP stack in Go
Learn how we enhanced TCP performance in Coder to achieve 5X faster throughput by optimizing buffer sizes, implementing the HyStart algorithm, and minimizing packet loss, significantly improving remote development experiences.
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Making USB devices – end to end guide to your first gadget
Introduction to implementing USB devices. Minimal overview of hardware and software with an example with STM32 microcontroller. Also contains an index to very detailed guides for more information.
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Upgrading my Chumby 8 kernel part 10: RTC
I’m going to start this post off with the obligatory list of links to the previous parts in the series if you’re new here and are interested in seeing the full story: 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , and 9 . This is the tale of how I upgraded my Chumby 8 to run a modern Linux kernel.
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SPI Flash
SPI Flash reader built from a Teensy or Arduino
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X is justifiably slow (2022)
I regularly hear or read statements like this: “X is slow but this is to be expected because it needs to do a lot of work”. It can be said about an application or a component in a larger system, and can refer to other resources that aren’t time. I often find these profoundly unhelpful as they depend much more on the…
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Why is Snapshot Isolation not enough?
Let's talk about why Snapshot Isolation is not enough for a general purpose concurrency control. Snapshot Isolation has been adap...