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iOS 15.4 Frida 15.1.17 Cannot Attach to Frontmost App
This is an FYI in case others have noticed this, or there's something I'm missing.
I noticed that with my iOS device (non jailbroken) at 15.4.1 (haven't tested 15.4) that Frida can no longer attach to the fronstmost application. e.g.
$ frida -U -F
____
/ _ | Frida 15.1.17 - A world-class dynamic instrumentation toolkit
| (_| |
> _ | Commands:
/_/ |_| help -> Displays the help system
. . . . object? -> Display information about 'object'
. . . . exit/quit -> Exit
. . . .
. . . . More info at https://frida.re/docs/home/
. . . .
. . . . Connected to iPad (id=xxxx)
No frontmost application on iPad
Looking into this a bit further, it looks like the problem (for my environment at least, if not all) is that the Instruments deviceinfo service on the device s no longer returning the the "foregroundRunning" in the dictionary for the results from "runningProcesses" for the process running in the foreground.
I haven't looked further into the root cause for this behavioral difference (e.g. functionality removed from instruments) or if it's worth investigating alternate methods to get at this infomration.
Device Info: iPad (iPad5,3, J81AP) running iOS 15.4.1, non JBed.