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By David Buchanan, 18th of March 2023 This article assumes you’ve already heard about the aCropalypse vulnerability, aka CVE-2023-21036. If not, go read about it here (oops, this page doesn't exist yet. Read this tweet in the meantime). For me, it all started with the following conversation: Simon — 2023-01-02 15:16 can you decompress a zlib stream which is missing the first say 0x10000 bytes but
By David Buchanan, 9th of March 2023 "do not violate the DMCA challenge 2023" Note: If you're here because you just want to watch Netflix on Asahi, install this, and then scroll down to the "Netflix-Specific Annoyances" section. About 6 months ago, the macOS install on my 1-year-old macbook decided to soft-brick itself. Rather than wiping and reinstalling, I took the opportunity to switch to Asahi
By David Buchanan, 16th of January 2023 PNG is my favourite file format of all time. Version 1.0 of the specification was released in 1996 (before I was born!) and the format remains widely used to this day. I think the main reasons it stuck around for so long are: It's "Good enough" at lossless image compression. It builds on existing technologies (zlib/DEFLATE compression). It's simple to implem
This PNG image renders differently in Apple vs non-Apple decoders: If you're using Apple-flavoured software, you should see "HELLO APPLE", and on all other software, you should see "HELLO WORLD". I found this while writing my own multi-threaded PNG decoder. While pondering my design, I realised that I had an exploitable implementation bug. After learning that Apple has their own implementation of
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