#xnu — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #xnu, aggregated by home.social.
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AsterOS
A Darwin/XNU Based Operating System
https://github.com/linuxkid473/AsterOS
via https://www.reddit.com/r/unix/comments/1vbjlsl/comment/p11d4ez/
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Okay, I am editing this post in place to apologise. Apparently Vali0004 uses AI tools in their Nix configs (shoutout to @stilic for bringing my attention to this) and also admits to LLM patches in the PureDarwin kernel as per this commit:
https://github.com/PureDarwin/xnu-loader/commit/f0ee6482f3a76b2163fc091c538aedce580c32b9Biggest apologies everyone.
Go fork PureDarwin from csekel's last commit instead and make your own loaders:
https://github.com/PureDarwin/PureDarwin/commit/88753c478c97b9a08bcdb66cecc68ba5881ff3af -
Every few years there is yet another attempt :) - NextBSD is revived again. https://nextbsd.org #bsd #darwin #xnu
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In part 2 of my macOS security internals series, I demystify System Integrity Protection (SIP), breaking down how the kernel enforces Apple-signed entitlements over POSIX root privileges, the mechanics of rootless.conf, and why the hardware always has the final veto.
Includes a small C program to audit your own CSR bitfield configuration.
Read the full deep dive here:
https://bytearchitect.io/macos-security/Apple-defences-SIP-and-APFS-(cont'd)/#macOS #infosec #cybersecurity #ReverseEngineering #XNU #AppleSecurity #Kernel #OSInternals #Rootless
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We call this kernel saunters: How Apple rearranged its #XNU with exclaves
Based on the references to exclaves in XNU source for #Apple's M4 chips and the A18 used in iPhone 16, source argues exclaves form the basis of a significant redesign of XNU's security model.
"In iOS 18, exclaves refer to specific resources that are separated from the main iOS kernel (XNU) and cannot be accessed by it, even if the kernel is compromised," the researcher explained in a document.
https://www.theregister.com/2025/03/08/kernel_sanders_apple_rearranges_xnu/ -
Changes to Apple Silicon put the @AsahiLinux project at odds with adding support for the M4 chips
https://www.linux-magazine.com/Online/News/Asahi-Linux-Runs-into-Issues-with-M4-Support?utm_source=MLM
#Linux #Asahi #AppleSilicon #M4 #XNU #hypervisor -
#Apple Darwin #OS and #XNU #Kernel Deep Dive - Tracing its evolution from Mach and #BSD roots to powering #macOS #iOS and Apple Silicon. This post explores the hybrid kernel’s design, its adaptation to new hardware and security paradigms, and why XNU remains a uniquely resilient and scalable foundation for Apple’s platforms https://tansanrao.com/blog/2025/04/xnu-kernel-and-darwin-evolution-and-architecture/
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🖥️ Ah, another 42-minute snooze fest on Apple's #Darwin #OS - because who doesn't want to be serenaded by the sweet nothings of #Mach and #BSD kernels? 🎻 Spoiler alert: #XNU is still resilient and scalable, just like every other tech cliché #Apple has been peddling since the dawn of time. 🍏
https://tansanrao.com/blog/2025/04/xnu-kernel-and-darwin-evolution-and-architecture/ #techcliches #snoozefest #HackerNews #ngated -
Apple's Darwin OS and XNU Kernel Deep Dive
https://tansanrao.com/blog/2025/04/xnu-kernel-and-darwin-evolution-and-architecture/
#HackerNews #Apple #Darwin #OS #XNU #Kernel #Deep #Dive #technology #blog
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On #Apple #Exclaves (M4 and A18 based systems). Exclaves are a new set of #security features that represent a significant enhancement for XNU’s traditional monolithic kernel. Exclaves refer to resources that are isolated from #XNU, protected even if the #kernel is compromised. These resources are pre-defined when the OS is built, are identified by name or id, have different types, are initialised at boot time, and are organized into unique domains. #SPTM protects exclave memory from XNU with new exclave-specific page types. https://randomaugustine.medium.com/on-apple-exclaves-d683a2c37194
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Cool read about #Apple #XNU (kernel) security enhancements coming down the pipeline.
https://www.theregister.com/2025/03/08/kernel_sanders_apple_rearranges_xnu/ -
Apple rearranged its XNU kernel with exclaves — https://www.theregister.com/2025/03/08/kernel_sanders_apple_rearranges_xnu/
#HackerNews #Apple #XNU #kernel #exclaves #tech #news #software #development -
A particularly 'sus' sysctl in the #XNU #Kernel #SUSCTL (CVE-2024-54507) https://jprx.io/cve-2024-54507/
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Recently got my hands on a #thinkpad x240 and decided to #hackintosh it with #macos Mojave! Still trying to get the audio to work, but I think I can make it work eventually. It’s also my first ever successful Hackintosh! Let me know what you guys think!
#laptop #computers #tech #cool #apple #mac #macosmojave #osx #unix #xnu #opencore #fun
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Was working on a silly project. It’s not gotten far, but I thought putting it on #github was a good idea. It’s a #kernel and #os in #rust meant to try and be a clone of XNU/Darwin (or at least attempt it) without the apple stuff. It may not be anything now, but putting it on GitHub can just show the development history ig. Feel free to check out, or even help with it. I don’t expect it to get far at all.
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Some cool #XNU #bugs by @adamd
CVE-2022-42845: 20-Year-Old XNU Use After Free Vulnerability in ndrv.c
http://adamdoupe.com/blog/2022/12/13/cve-2022-42845-xnu-use-after-free-vulnerability-in-ndrv-dot-c/
CVE-2023-23504: XNU Heap Underwrite in dlil.c
http://adamdoupe.com/blog/2023/01/23/cve-2023-23504-xnu-heap-underwrite-in-dlil-dot-c/
