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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
      • Report Tweet
      • 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. Hector Martin‏ @marcan42 19 Jan 2018
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      Of course addresses are obfuscated in similar ways to what @JonTt did, by breaking them up into chunks and shifting/offsetting them. And one of the potential outcomes is... good old upside down screen.pic.twitter.com/w47k58NEk0

      1 reply 0 retweets 15 likes
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    6. Hector Martin‏ @marcan42 19 Jan 2018
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      At an outer layer, in the executable packer, we depend on a hardware bug that corrupts uncached MEM2 writes to generate an AES key, which is also mixed with the code itself (antitampering) and a check that we're running from an address in range. This is what breaks Dolphin.pic.twitter.com/0PNgj03uTb

      2 replies 3 retweets 21 likes
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    7. Hector Martin‏ @marcan42 19 Jan 2018
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      The installer has many checks including custom ARM code that reads titles and checks signatures, but the best is the Ioctl Fun Machine, which sends random ioctls to IOS and compares timing against what we expect for a standard retail IOS. Also has encrypted functions.pic.twitter.com/qPqpPhhX9t

      2 replies 0 retweets 13 likes
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      Hector Martin‏ @marcan42 19 Jan 2018
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      Replying to @riking27

      Yes, it's a global and _ios_ioctlv (which is a wrapper) writes to it.

      2:00 AM - 19 Jan 2018
      0 replies 0 retweets 0 likes

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