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So far, I've only had a few days to work on A12 Substrate (something I couldn't even start doing until a few weeks ago, when I was given the first jailbreak build useful for testing with). I do not understand why anyone thinks I am able to spend all of my time on this anymore :(.
For A12, it (surprisingly to me) turned out Pointer Authentication Codes were not a problem; however, Apple built a new layer of codesign--"physical map codesign" (pmap_cs_*, largely missing from the XNU codebase)--as part of their "Page Protection Layer". newosxbook.com/articles/CasaD…
San Bingner, using the awesome emulator environment from @CorelliumHQ, helped me verify my guesses here were correct (debugging into a call to pmap_cs_associate), but I just don't have the time right now to spend reverse engineering and attempting to understand this new logic :(.
Even if I did, to be very frank about it: I find working on stuff for jailbreaking neither important (as I used to for the large, stable, untethered jailbreaks, with the goal of fighting copyright law: an era that is long over) nor fun (due to the horrible developer toxicity) :/.
In particular, harassing me and everyone around me via every communication channel you can figure out to contact me is _not_ going to make me somehow care _more_ about doing this: all you are doing is making me deeply regret having returned. I gain nothing from doing any of this.
It is absolutely ludicrous to me that people are assuming that I would do this work _at all_ much less that I should _already have finished it_... "best case" I would never have expected to have had this done by now, as I honestly think this will be more than three weeks of work!
