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<JPeisach1>
hello all, I'd like to do some RE. I have read https://asahilinux.org/copyright/ and am aware you would prefer if I came here first, so, here I am. I'm specifically interested in the fingerprint sensor.
<chaos_princess>
do you have a mac that you won't mind constantly wiping and reloading?
<JPeisach1>
...nope :/ just my M1 MBP.. i guess i could buy another laptop before I go off to college but I wasn't intending on doing so.
<JPeisach1>
I guess that's pretty much a "yeah don't do this" sign, isn't it
<chaos_princess>
well, more like "be aware of what you are getting into"
<chaos_princess>
this is for SEP (a touch id prerequisite) specifically, nothing else needs that
<JPeisach1>
if i may ask, what would be the reason for needing to have to wipe?
<JPeisach1>
does RE have to occur while things are loaded?
<chadmed>
if you corrupt any of SEP's data your machine will be unbootable
<chaos_princess>
^. and also say bye to everything that is filevault-ed
<chaos_princess>
machine is recoverable from that state, obviously, but it is a process
<chadmed>
imo its not _likely_ if youre very very careful but pobody's nerfect and we havent really played with sep enough to know what the safety limit is, beyond "there is a risk"
<chaos_princess>
i think it is likely when figuring out xart
<chaos_princess>
as there is anti-replay protection
<chadmed>
from what i remember i dont think xart is in the hot path for mesa but that was *checks notes* almost 5 years ago now
<chaos_princess>
you need it before sbio endpoint even comes up
<chaos_princess>
where do you think it stores the fingerprint data :P
<JPeisach1>
so i'm guessing that the SEP will block attempts to extract its fw, based on reading docs?
<JPeisach1>
and its encrypted
<chaos_princess>
why do you need sep's fw
<chaos_princess>
just talk to it the same way macos does
<chadmed>
you should not need sep's fw, trace macos with m1n1 in the first instance
<chadmed>
SEPOS is loaded by the time you need to talk to SEP
<chaos_princess>
not really, but we know how to load it
<chaos_princess>
as in, the current driver already does it
<chadmed>
we already load it and boot it
<chadmed>
yeah that
<JPeisach1>
ok now I see why there is high risk involved
<chadmed>
if you fuck up xart/keybag everything stops working. again, these machines are effectively unbrickable save for cosmic rays hitting the ROM with the first stage bootloader so you can always recover, but do _not_ keep any important data on the device under test
* chaos_princess
violates that rule all the time for non-sep-related activities
<chaos_princess>
(i do have backups)
<JPeisach1>
I guess I'll be leaving that alone then, if I RE other things that aren't SEP related I will let you know
<chaos_princess>
before you go, tell us what you want to work on
<JPeisach1>
(unless someone puts upan unused mbp on ebay or something.)
<chaos_princess>
we may have pointers
<chaos_princess>
why do you care about unused?
<JPeisach1>
Tbh my only idea was fingerprint stuff, because it's not implemented. yet and it would be an area of work
<JPeisach1>
s/unused/used (because it would be cheaper)
<tryhard[m]>
just buy the cheapest one that still works somehow
<chaos_princess>
... so, turns out, i am an idiot
<chadmed>
video decoder or encoder still doesnt work and a lot of the hard work is done for some codecs if you wanted to take a look at those instead
<chadmed>
chaos_princess: thats my line
<chaos_princess>
i've got a m1 mini with the intent to use as a "sep machine" in the future, but, uh, minis don't have a fp sensor
<chaos_princess>
whatever, will do sep on that, and fp on my other laptop
<jannau>
there is a magic keyboard with fingerprint sensor, obviously working differently wrt the transport
<JPeisach1>
chadmed: thanks. after exams and the school year wraps up, I might look at it.
<chaos_princess>
yea, i know
<chaos_princess>
and i still need a m1 box for other reasons anyway
<tryhard[m]>
if you need testing for sep you can let me know
<chadmed>
we have enough sacrificial machines between us to build a fort out of macs i think
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