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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Hector Martin‏ @marcan42 18 Jan 2018
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      • Report NetzDG Violation

      Neat copy protection scheme. Reminds me of the GC/Wii disk protection (also based on holes punched by a laser), but on read-write floppies. The obfuscation is similar to what we do for antitampering on The Homebrew Channel (but we go a bit further :P).https://www.youtube.com/watch?v=Qaq9vlfoGnA …

      6 replies 58 retweets 164 likes
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    2. Hector Martin‏ @marcan42 19 Jan 2018
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      Our integrity protection hash stores its result in a *memory controller register* (address indirectly constructed), not a variable. That register is not accessible from IOS, in case anyone tries to debug from there. It is checked with a completely different code sequence.pic.twitter.com/2S8NdRuuRR

      2 replies 5 retweets 22 likes
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    3. Hector Martin‏ @marcan42 19 Jan 2018
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      What does the code do when it detects tampering? It re-introduces a buffer overflow bug in the new TTF font code that took us a month to originally debug before release. Making HBC *just* crashy enough to be unusable. And the crashes happen *way* later, due to a corrupted heap.pic.twitter.com/P9uGYb4goU

      5 replies 7 retweets 46 likes
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    4. Hector Martin‏ @marcan42 19 Jan 2018
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      Separate from this, system and title integrity (i.e. that you aren't using warez IOSes or a "pirated" HBC) is checked by a whole bunch of code (that is much more obvious), and the result stored in a Graphics Quantization Register, read by doing bit manipulation on a stored float.pic.twitter.com/o2aDrqsPTs

      2 replies 1 retweet 16 likes
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    5. Nikki™  🌹‏ @NWPlayer123 19 Jan 2018
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      Replying to @marcan42

      was all this really necessary

      1 reply 0 retweets 0 likes
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      Hector Martin‏ @marcan42 19 Jan 2018
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      Replying to @riking27 @NWPlayer123

      Exactly. We had lots of scammers selling HBC with "piracy guides" before we started doing this.

      12:24 AM - 19 Jan 2018
      1 reply 0 retweets 0 likes
        1. Nikki™  🌹‏ @NWPlayer123 19 Jan 2018
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          Replying to @marcan42 @riking27

          so that's what that warning was for, I wasn't around until 2011 which was after 4.3 so I missed the fun stuff

          0 replies 0 retweets 0 likes
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