Seriously, now I want to buy a camera, smash the chip, and crack their firmware so it doesn't have the check. As far as I know there is no secureboot involved, so it should be trivial. This Is Just Inexplicably Dumb.https://twitter.com/marcan42/status/1088472549715918848 …
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What undocumented VideoCore 4 unit? https://github.com/itszor/vc4-toolchain … Also patching out a stupid check needs a lot less than a complete reverse engineering of the architecture.
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There already is an IDA plugin for VC4. It works. I've used it.
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Replying to @q3k
Hector Martin Retweeted Hector Martin
So much for the massive investment.https://twitter.com/marcan42/status/1088506051295567872 …
Hector Martin added,
Hector Martin @marcan42HMAC-SHA256 key for the secret authentication chip: a9ec1b1359251fdb4d06efb95dc19ebcfb39e72e08253e5ab2d603de5800f500 XORing every byte with the previous one, top notch obfuscation there rPi Foundation. sub_EC8ABBC on the latest start_db.elf. pic.twitter.com/YkwZjFbjgYShow this thread0 replies 0 retweets 7 likes -
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Assuming they actually thought ahead enough to actually populate them all.
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It's entirely trivial to just patch this out of their start-up blob entirely anyway.
7:11 PM - 24 Jan 2019
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