Someone should mod an iPhone (sw or physically) to log and exfiltrate the attack and leave if where some incompetent & overfunded local LE will plug it in one of these.
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I’ve seen USB driver code at both the OS and micro-controller level - it’s not pretty. You’d be surprised how many special cases are required just to negotiate charging.
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Yes but that logic has no need to interact with OS or security processor logic. Can be completely isolated.
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That would be interesting, and it would also be something not called USB.
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Sure it's USB (or rather USB over lightning). It's just 2+ separate logical USB devices, and which is connected is gated by lock state of the phone.
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This starts to become a highly specialized phone that is useless when locked. Might as well turn off bluetooth, wifi, and push notifications while locked. How is this isolated set of chips going to know when the phone is unlocked? Who is going to signal it?
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Software can switch it all when entering locked state. I've actually never used my phone's USB port for anything but charging & initial OS install so it hardly seems "useless" to me.
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You’re mixed up. You’d introduce a hardware isolation gate to protect the OS from port access while phone is locked, but the signal controlling the gate (“user unlocks phone with PIN”) has to come from the OS side of the boundary. How does that help?
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Not going to continue responding with your condescension.
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Other than security vs. convenience and fancy features at least. There are too many uses for data-based stuff when the device is locked for a general purpose device to make that sacrifice by default.
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There's no reason it couldn't be switchable in Settings->Security or similar.
End of conversation
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