Does anyone know if iOS has a watchdog for making sure that SpringBoard runs, and if so, how do I disable it?
... yes it does, /usr/libexec/watchdogd
It just rebooted my phone with a "Userspace watchdog timeout". Sigh.
It just rebooted my phone with a "Userspace watchdog timeout". Sigh.
Unloading /usr/libexec/watchdogd causes another panic ("no checkins from watchdogd in 91 seconds")
Sigh.
Sigh.
watchdogd helpfully tells you how to break it: the panic method is identified by an error message of "watchdogd failed to panic device".
But I'm not going to try to fight it with a debugger: going to try to run WindowServer headless instead.
But I'm not going to try to fight it with a debugger: going to try to run WindowServer headless instead.
I tried adding a breakpoint to the "is watchdog defanged" method in watchdogd, which didn't work.
The breakpoint didn't trigger and the device panicked anyways.
I'm guessing I can't debug watchdogd?
watchdogd also ignores watchdog if the service is being debugged; I'll use that
The breakpoint didn't trigger and the device panicked anyways.
I'm guessing I can't debug watchdogd?
watchdogd also ignores watchdog if the service is being debugged; I'll use that
Bypassed the watchdog.
watchdogd helpfully contains code to disable the kernel watchdog, so I just copied it into my own program.
github.com/zhuowei/iOS-ru…
watchdogd helpfully contains code to disable the kernel watchdog, so I just copied it into my own program.
github.com/zhuowei/iOS-ru…
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