#asahi-re on 2025-02-23 — irc logs at oftc.irclog.whitequark.org

2024-07-16 04:52 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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09:36 <adsss1578> Is there a guide on how to start doing this? I have some experienve with aarch64 and C. Also had used Ghidra and IDA

09:37 <chaos_princess> step 1 is to put away ghidra :P

09:37 <adsss1578> Binja then?

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09:37 <chaos_princess> https://asahilinux.org/copyright/

09:39 <chaos_princess> the approach is to run macos in a special hypervisor and trace its hardware interactions

09:39 <chaos_princess> https://asahilinux.org/docs/SW-Hypervisor/

09:40 <chaos_princess> m1n1 the thing that can run macos in a very thin vm, hook hw accesses and run python scripts in response. There are a bunch of examples in that repo

09:40 <adsss1578> I'll start with those 2 links and come back later. Thanks for the headsup.

09:41 <adsss1578> I just watched 2 talks by the original maintainer and think this is one of the cooles things to wotk on tbh

09:41 <adsss1578> catch yall later

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09:49 <sven> you don’t need a apfs driver for the rest. just figure out the offsets if the gigalocker file on that xart partition and do raw read/writes

09:50 <sven> its contiguous and doesn’t change size

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11:35 <sven> if I were to reverse SEP I'd probably do it similarly to how lina did agx: first write a python thing that can drive it inside m1n1 to figure out how it actually works

11:36 <sven> then think about how to properly implement this. from what i saw a few years ago when I looked at it a bit what we probably want is a dumb kernel driver that allows to send/recv messages to those SEP endpoints and do most of the heavy lifting in a userspace rust daemon

11:37 <sven> the only part where that may or may not work is full disk encryption since that needs a channel between our nvme driver and SEP and we might have to do that entirely inside the kernel

11:37 <sven> but that's why I'd start with a python thing that drives it first to understand what exactly we need to do to drive it

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