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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 19 Jan 2018
      • Report Tweet
      • Report NetzDG Violation

      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
      Show this thread
    2. Hector Martin‏ @marcan42 19 Jan 2018
      • Report Tweet
      • Report NetzDG Violation

      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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    3. 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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    4. Hector Martin‏ @marcan42 19 Jan 2018
      • Report Tweet
      • Report NetzDG Violation

      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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    5. 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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    6. Hector Martin‏ @marcan42 19 Jan 2018
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      • Report NetzDG Violation

      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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    7. Hector Martin‏ @marcan42 19 Jan 2018
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      Also, if you try to install HBC/BootMii on a devkit, it just installs them without using any exploits, using legitimate devkit signing keys (which are published with the SDK and thus leaked a long time ago).pic.twitter.com/OWeYMSsFHj

      2 replies 0 retweets 12 likes
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    8. Hector Martin‏ @marcan42 19 Jan 2018
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      • Report NetzDG Violation

      Also we may or may not be sending some strings to devkit/debugger print vectors.pic.twitter.com/qV41v4bmLi

      3 replies 1 retweet 21 likes
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    9. Hector Martin‏ @marcan42 19 Jan 2018
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      One of the supported IOS exploits is hidden in the middle of the Ioctl Fun Machine. A simpler version of this kind of obfuscation/misdirection was featured in the very first Homebrew Channel Installer that didn't rely on the signature validation bug.pic.twitter.com/wAiquwVdOu

      5 replies 0 retweets 9 likes
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    10. Adam  ♿‏ @voltagex 19 Jan 2018
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      Replying to @marcan42

      Why is this all needed? Will it cause problems for archivists / historians in the future?

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

      Hector Martin Retweeted Hector Martin

      We did open source a version of HBC that is free from all this stuff. The latest published binary should function on all retail consoles; non-retail hardware (like emulators) doesn't need exploits and thus can use the open source version.https://twitter.com/marcan42/status/954277085933010944 …

      Hector Martin added,

      Hector Martin @marcan42
      Replying to @Myriachan
      To stop scammers from selling HBC with how-to-pirate-games guides. It's reverse-DRM: makes sure you *didn't* pay for it. Also, tangentially, we *really* don't want HBC used (at runtime) together with piracy patches due to their shoddy code causing crashes.
      1:04 AM - 19 Jan 2018
      • 1 Like
      • Adam ♿
      0 replies 0 retweets 1 like

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