#asahi-re on 2022-10-18 — irc logs at oftc.irclog.whitequark.org

2022-08-14 19:46 ChanServ changed the topic of #asahi-re to: Asahi Linux: porting Linux to Apple Silicon macs | Hardware / boot process / firmware interface reverse engineering | WARNING: this channel (only) may contain binary reverse engineering discussion | RE policy: https://alx.sh/re (MANDATORY READ) | GitHub: https://alx.sh/g | Wiki: https://alx.sh/w | Logs: https://alx.sh/l/asahi-re

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13:42 <amarioguy2> sven - this weekend i'll more thoroughly document those endpoints I'm a lot more free this weekend than i was last time

13:42 <amarioguy2> probably also going to mess with using single user mode for tracing

13:43 <amarioguy2> given that when macOS is booted fully, SKS is very spammy due to how data protection works

13:43 <sven> i'd start with xarts anyway

13:43 <sven> that shouldn't be very spammy and it's also the first thing required to get SEP up

13:43 <sven> it won't even expose the sks endpoint before it did some xARTs init dance

13:45 <amarioguy2> yep

13:45 <amarioguy2> do you want me to upload logs i get somewhere in case you want to take a look at anything

13:47 <sven> I don't think i'll have enough time to look at them

13:49 <amarioguy2> fair enough, dw about it

13:49 <amarioguy2> i know DCP is a royal pain anyways so it's fine

13:53 <sven> SEP could well be DCP-level insanity :-P

13:53 <sven> I think it's at least a bit more sane though and they shouldn't be able to break the API all the time

13:54 <marcan> they can't, it has to be forever backwards compatible

13:54 <marcan> same as ANS

13:54 <sven> but there's also at least a secondary IPC on top of the first one

13:54 <sven> yeah

13:54 <marcan> (and SMC for that matter)

13:55 <sven> 26: "generic_operation", <-- that call is that other IPC protocol iirc

13:59 <_jannau_> I'd hope that SEP is overall much smaller than DCP

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14:00 <amarioguy2> iirc on the iOS side at least (not sure how applicable it is to the mac side) SEP is loaded by iBoot2, so unless they shove it in NOR or smth, i'd imagine the SEP firmware for the OS install is on the preboot partition

14:00 <sven> we probably only care about a subset of what it does anyway. right now I can only think about touchid and secure key store/filevault

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14:00 <sven> iboot puts the firmware in memory

14:00 <sven> there's code somewhere in m1n1 to boot it

14:01 <sven> https://github.com/AsahiLinux/m1n1/blob/main/proxyclient/m1n1/hw/sep.py dunno if it still works

14:03 <sven> and the firmware might actually be inside the NOR flash depending on how early iboot wants to bring SEP up

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14:03 <sven> actually wouldn't surprise me if it is

14:03 <amarioguy2> could always dump the raw NOR :D

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14:04 <amarioguy2> issue is that i spent a decent amount on this t6002 would rather not do that lol

14:04 <sven> it's encrypted anyway

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14:04 <amarioguy2> headers are not though

14:04 <amarioguy2> identifier for fw is in there

14:04 <sven> and you can just dump the NOR from linux

14:04 <sven> so?

14:05 <sven> the firmware is essentially an opaque blob for us. and as i said, it's somewhere in RAM with the address passed in the ADT anyway

14:07 <amarioguy2> right

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14:22 <amarioguy2> w/e the case on backcompat (i'm starting on one OS version anyways for tracing), definitely doing xarts first

14:22 <amarioguy2> (12.3.1, two partitions i mean)

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