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patjak / facetimehd

Reverse engineered Linux driver for the FacetimeHD (Broadcom 1570) PCIe webcam
GNU General Public License v2.0
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OSX 10.11.3 has different firmware and extract/make does not work #62

Closed chris-milsted closed 8 years ago

chris-milsted commented 8 years ago

I was just getting around to trying this on my MBP (Late 2014 15" model) and after updating OSX I have found I am running 10.11.3 and the hashes are wrong again.

I coped the firmware into the ./firmware/ folder:

$ ls AppleCameraInterface extract-firmware.sh Makefile

I then ran make:

$ make

Error: Mismatching driver hash for AppleCameraInterface Error: The unknown hash is dfac86799c6cf0aceb59bb4e732be8f030e7943eb1146830c7136f62621c9853 Error: No firmware extracted! Makefile:21: recipe for target 'all' failed make: *\ [all] Error 1

Hence I just tried to dd out the firmware using the old offsets and found that the firmware may have changed.

I copied the System/Library/Extensions/AppleCameraInterface.kext/Contents/MacOS/AppleCameraInterface file onto a memory key and when I sha256sum this on Fedora 23 I get:

dfac86799c6cf0aceb59bb4e732be8f030e7943eb1146830c7136f62621c9853 ./AppleCameraInterface

So another new Hash.

I ran the following to try and extract the firmware, just using the old offset:

dd bs=1 skip=81920 if=./AppleCameraInterface of=firmware.bin

But when I run the check.sh script it fails:

$ ./check.sh firmware.bin The extracted firmware does not seem good (wrong header)

So I need to figure out how to work out the right offset, then I can add the new hash and the new offset as well to a pull request.

patjak commented 8 years ago

You don't need to copy AppleCameraInterface from OSX anymore. Just type make and the correct file will be downloaded and the firmware extracted. Then do make install and you're good to go.

patjak commented 8 years ago

I'll have a look at the new firmware version to see if we can use it or not.

chris-milsted commented 8 years ago

Want me to upload the firmware here?

patjak commented 8 years ago

No need, I probably have it already if I do the latest updates in OSX.

chris-milsted commented 8 years ago

OK - thanks!

chris-milsted commented 8 years ago

So I had a quick play - looking at your extract file the signature of the firmware is:

feffffeafeffffeafeffffeafeffffeafeffffeafeffffeafeffffea

I had a look for the feff string to see if I could find this - I guess it should be followed by the ffea block:

$ hexdump ./AppleCameraInterface |grep feff 0052ae0 816c b63e 808c e99d b6c4 feff 6135 fa67 00686d0 ef32 e274 064f feff 0d6a ad33 6c7d 25a6 0098550 1565 f4a2 feff d7ce 8f03 12a3 7256 1fdf

I can only see the following patterns:

feff 6135 feff 0d6a feff d7ce

I guess this means the firmware blob has changed?

Thanks

Chris

lkocman commented 8 years ago

Hi Guys, is there any progress or some sort of guide on how to help?

Lubos

jhgorse commented 8 years ago

The curl script to download the 10.11.2 update fails, though the url still exists and works. Manually downloading it works. https://support.apple.com/downloads/DL1849/en_US/osxupd10.11.2.dmg

patjak commented 8 years ago

make still works fine for me. Could it be something else that is wrong? Here's my setup:

curl 7.47.1 (x86_64-pc-linux-gnu) libcurl/7.47.1 OpenSSL/1.0.2g zlib/1.2.8 libidn/1.32 libssh2/1.7.0
Protocols: dict file ftp ftps gopher http https imap imaps pop3 pop3s rtsp scp sftp smb smbs smtp smtps telnet tftp 
Features: AsynchDNS IDN IPv6 Largefile GSS-API Kerberos SPNEGO NTLM NTLM_WB SSL libz TLS-SRP UnixSockets
xz (XZ Utils) 5.2.2
liblzma 5.2.2
cpio (GNU cpio) 2.12
jhgorse commented 8 years ago 
curl -V
curl 7.40.0 (x86_64-redhat-linux-gnu) libcurl/7.40.0 NSS/3.21 Basic ECC zlib/1.2.8 libidn/1.32 libssh2/1.5.0
Protocols: dict file ftp ftps gopher http https imap imaps ldap ldaps pop3 pop3s rtsp scp sftp smb smbs smtp smtps telnet tftp 
Features: AsynchDNS IDN IPv6 Largefile GSS-API Kerberos SPNEGO NTLM NTLM_WB SSL libz UnixSockets Metalink 

xz (XZ Utils) 5.2.0
liblzma 5.2.0

cpio (GNU cpio) 2.11

I am re-learning linux sys admin and it is not entirely clear how to get those next versions on Fedora 22. Fedora 24 appears to have them. And now the update minigame... or something else entirely. =)

patjak commented 8 years ago

Just to be clear, I'm not sure upgrading those utils will help but it might be worth a try.

yantarou commented 8 years ago

I just created above PR to make the firmware scripts work with 10.11.3.

The contained firmware version didn't change though.

patjak commented 8 years ago

Hmm, would be nice if we could support more than one version of the extraction in the Makefile. Not sure how long Apple usually keeps their updates available as downloads.

chris-milsted commented 8 years ago

I am going to close this as the PR from @yantarou solves this for me.

patjak commented 8 years ago

@chris-milsted Did I understand it right that you never tried downloading the dmg by running make but instead copied the driver from your OSX installation and ran the extraction script?

patjak commented 8 years ago

...I'm trying to figure out if we have a problem with the downloading part or not.

chris-milsted commented 8 years ago

@patjak yes - I booted into OSX, copied the AppleCameraInterface file onto a USB memory key and then rebooted into grub and Fedora 23 and placed that into the bcwc_pcie/firmware/ folder before I ran the make.

Once I updated with the changes for 10.11.3 in the PR it now all works perfectly.

I suspect therefore that the issue could be with the downloading not the extraction as I have just tested this all and it works fine here.

Thanks

Chris