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Writing a Unix Shell
Building your own UNIX shell in parts. This post focuses on the semantics of the fork system call.
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Introduction to ARM Assembly Basics
Welcome to this tutorial series on ARM assembly basics. This is the preparation for the followup tutorial series on ARM exploit development . Before we can dive into creating ARM shellcode and build ROP chains, we need to cover some ARM Assembly basics first.
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ReactOS 0.4.5 Released
ReactOS is a free, opensource reimplementation of windows
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View Counting at Reddit
Get the latest product news, company announcements, and user insights from the official Reddit blog.
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What's the difference between the com and exe extensions? (2008)
Practical development throughout the evolution of Windows.
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PostmarketOS: Aiming for a 10 year life-cycle for smartphones
Introduction post to postmarketOS , a touch-optimized, pre-configured Alpine Linux with own packages, that can be installed on smartphones. (Not usable for most people yet!)
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How Dirty COW works from the Linux kernel’s perspective
Dirty COW (CVE-2016-5195) is one of the most publicised local privilege escalation vulnerabilities in 2016, courtesy to its catchy name, cute logo, potential damages, and the fact that it was discovered in the wild by a researcher Phil Oester, meaning it was already under active use at the time of discovery.
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Writing a Fast JSON Parser
Several holidays ago, I got a bee in my bonnet and wrote a fast JSON parser whose parsed AST fits in a single contiguous block of memory. The code was small and simple and the performance was generally on-par with RapidJSON, so I stopped and moved on with my life.
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Distributed Consensus – How Shared Data Is Stored
If you don’t work in computers, you probably haven’t spent much time thinking about how data gets stored on computers or in the cloud. I’m…
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The largest Git repo
It’s been 3 months since I first wrote about our efforts to scale Git to extremely large projects and teams with an effort we called “Git Virtual File System”. As a reminder, GVFS, together with a set of enhancements to Git, enables Git to scale to VERY large repos by virtualizing both the .git folder […]
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Postgres performance analysis resulted in a 10x improvement in CPU use
Heap is the only digital insights platform that shows everything users do on your site, revealing the "unknown unknowns" that stay invisible with other tools. Learn about how we improved our performance and saved millions!
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Mono 5.0 Ships with Concurrent Garbage Collector
In Mono 5.0 we are shipping a new operation mode for our Garbage Collector: Concurrent Garbage Collection.
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Adding a new Bytecode instruction to the .NET runtime
Now that the CoreCLR is open-source we can do fun things, for instance find out if it’s possible to add new IL (Intermediate Language) instruction to the runtime.
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Further hardening glibc malloc() against single byte overflows
Introduction Back in 2014, while at Project Zero, I exploited a buffer overflow of a single NUL byte in glibc . Tavis Ormandy had found th...
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Reverse-Engineering the Intel Management Engine
Purism makes premium phones, laptops, mini PCs and servers running free software on PureOS. Purism products respect people's privacy and freedom while protecting their security.
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Treble: A modular base for Android
News and insights on the Android platform, developer tools, and events.
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New Distros Coming to Bash/WSL via Windows Store
We're REALLY excited about this announcement and think many of you will be too ;) On May 11th 2017, during Microsoft's Build conference keynote, Terry
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Exploiting the Linux kernel via packet sockets
Guest blog post, posted by Andrey KonovalovIntroductionLately I’ve been spending some time ...
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The evolution of Unix architecture in two diagrams
Today I put online two diagrams depicting the architecture of the Unix operating system , one for the 1972 First Research Edition and one for FreeBSD, one of its direct descendants. Here are the details on how I created these diagrams.
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Lost Generation: The Relay Computers
Our previous installment described the rise of automatic telephone switches, and of the complex relay circuits to control them. Now we shall see how scientists and engineers developed such relay c…