Mastodawn

Nov 8, 2024

Apple added a feature called "inactivity reboot" in iOS 18.1. This is implemented in keybagd and the AppleSEPKeyStore kernel extension. It seems to have nothing to do with phone/wireless network state. Keystore is used when unlocking the device. So if you don't unlock your iPhone for a while... it will reboot!

In the news: "Police Freak Out at iPhones Mysteriously Rebooting Themselves, Locking Cops Out"
https://www.404media.co/police-freak-out-at-iphones-mysteriously-rebooting-themselves-locking-cops-out/

iOS version diffs to see yourself:
https://github.com/search?q=repo%3Ablacktop%2Fipsw-diffs%20inactivity_reboot&type=code

Police Freak Out at iPhones Mysteriously Rebooting Themselves, Locking Cops Out

Law enforcement believe the activity, which makes it harder to then unlock the phones, may be due to a potential update in iOS 18 which tells nearby iPhones to reboot if they have not been in contact with a cellular network for some time, according to a document obtained by 404 Media.

404 Media

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Morgan Hill Nov 8, 2024

@jiska one wonders whether this is an intentional security feature or just a workaround for some hard to fix bug.

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jiska 🦄

@pcwizz GrapheneOS does the same, so I think it's intended.

https://grapheneos.social/@GrapheneOS/112204443465440601

GrapheneOS (@[email protected])

Our auto-reboot feature starts a timer after the device is locked which will reboot the device is it isn't unlocked successfully before the timer elapses. This is set to 18 hours by default but can be set between 10 minutes and 72 hours. It won't chain reboot the device anymore.

GrapheneOS Mastodon