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patjak / facetimehd

Reverse engineered Linux driver for the FacetimeHD (Broadcom 1570) PCIe webcam
GNU General Public License v2.0
1.36k stars 160 forks source link

Certification issues, I guess #244

Closed random-integer closed 3 years ago

random-integer commented 3 years ago

Hi, I'm trying to install the drivers for the MacBook webcam. I'm following the instructions here to install the kernel module manually because I can't find "another one for the firmware itself". Here's what I did.

$ git clone https://github.com/patjak/facetimehd-firmware.git
...
$ cd facetimehd-firmware
$ make
... (just like https://github.com/patjak/bcwc_pcie/wiki/Get-Started#firmware-extraction )
$ sudo make install
... (just like https://github.com/patjak/bcwc_pcie/wiki/Get-Started#firmware-extraction )
$ cd ..
$ git clone https://github.com/patjak/bcwc_pcie.git
...
$ cd bcwc_pcie
$ make
make -C /lib/modules/5.10.36-2-MANJARO/build M=/home/randint/webcam_stuff/bcwc_pcie modules
make[1]: Entering directory '/usr/lib/modules/5.10.36-2-MANJARO/build'
  CC [M]  /home/randint/webcam_stuff/bcwc_pcie/fthd_ddr.o
  CC [M]  /home/randint/webcam_stuff/bcwc_pcie/fthd_hw.o
  CC [M]  /home/randint/webcam_stuff/bcwc_pcie/fthd_drv.o
  CC [M]  /home/randint/webcam_stuff/bcwc_pcie/fthd_ringbuf.o
  CC [M]  /home/randint/webcam_stuff/bcwc_pcie/fthd_isp.o
  CC [M]  /home/randint/webcam_stuff/bcwc_pcie/fthd_v4l2.o
  CC [M]  /home/randint/webcam_stuff/bcwc_pcie/fthd_buffer.o
  CC [M]  /home/randint/webcam_stuff/bcwc_pcie/fthd_debugfs.o
  LD [M]  /home/randint/webcam_stuff/bcwc_pcie/facetimehd.o
  MODPOST /home/randint/webcam_stuff/bcwc_pcie/Module.symvers
  CC [M]  /home/randint/webcam_stuff/bcwc_pcie/facetimehd.mod.o
  LD [M]  /home/randint/webcam_stuff/bcwc_pcie/facetimehd.ko
make[1]: Leaving directory '/usr/lib/modules/5.10.36-2-MANJARO/build'
$ sudo make install
make -C /lib/modules/5.10.36-2-MANJARO/build M=/home/randint/webcam_stuff/bcwc_pcie modules_install
make[1]: Entering directory '/usr/lib/modules/5.10.36-2-MANJARO/build'
  INSTALL /home/randint/webcam_stuff/bcwc_pcie/facetimehd.ko
At main.c:160:
- SSL error:02001002:system library:fopen:No such file or directory: crypto/bio/bss_file.c:69
- SSL error:2006D080:BIO routines:BIO_new_file:no such file: crypto/bio/bss_file.c:76
sign-file: certs/signing_key.pem: No such file or directory
  DEPMOD  5.10.36-2-MANJARO
make[1]: Leaving directory '/usr/lib/modules/5.10.36-2-MANJARO/build'

Here, I was wondering why it failed. Then, I read this. I figured that I hadn't reboot before running sudo make install in bcwc_pcie, so I did, then tried again.

(in bcwc_pcie)
$ sudo make install

I got the same output again! What should I do? It seems like something is wrong with certifying the module or something (I don't really know).

Info:

OS: Manjaro Linux x86_64
Host: MacBookPro12,1 1.0
Kernel: 5.10.36-2-MANJARO

By the way, I have successfully installed this driver once (I forgot how I did it). But after a kernel update, it broke, and only until now that I decided to make it work again.

Please do ask me if there's something else you need to know to solve my problem.

random-integer commented 3 years ago

The makers aren't gonna look into this?

alexshpilkin commented 3 years ago

@random-integer This looks like you haven’t set up module signing properly, i.e. a problem that has nothing to do with this driver specifically, it’s just that you need to set up a build environment for any out-of-tree module to work. Getting module signing to work is unfortunately fairly distro-specific and sometimes even specific to the UEFI Secure Boot firmware on your machine. It’s a mess, and a mess that is in large part due to Microsoft requiring Secure Boot from computer manufacturers for their “Windows Logo” certification. ... It’s too late to do anything about it, I guess.

I searched for pem in the project issues and ended up with #83, #89, #99, #107, #134, #160, #174, #176, #181, #191, #195, #210, and #238. To be fair, this is a place where the documentation is lacking, guessing the correct search term requires at least a slight idea of what’s wrong, and not all of these links have useful discussion behind them, but generally people are going to be more responsive if your issue report indicates that you have looked through the bug tracker before posting.

If you want to get things to work the way you’ve been trying to, you’ll have to look into setting up module signing; I’ve tried to gather a collection of links the last time it came up, at https://github.com/patjak/bcwc_pcie/issues/238#issuecomment-771130767. Alternatively, given that you’re on Manjaro, have you considered using the bcwc-pcie-git package from AUR? It uses DKMS and should take care of these (and other) issues for you. You might also want to get facetimehd-firmware to improve sensor calibration, although that requires wrangling some files out of macOS.

fultonm commented 3 years ago

See if this answer can help you: https://superuser.com/questions/1214116/no-openssl-sign-file-signing-key-pem-leads-to-error-while-loading-kernel-modules/1322832#1322832

You mentioned you updated your kernel. The cert lives in the kernel root folder, so you may need to generate a new cert for the new kernel.

random-integer commented 3 years ago

Alternatively, given that you’re on Manjaro, have you considered using the bcwc-pcie-git package from AUR? It uses DKMS and should take care of these (and other) issues for you. You might also want to get facetimehd-firmware to improve sensor calibration, although that requires wrangling some files out of macOS.

@alexshpilkin I just tried out the AUR package, and it works! It didn't work a few months ago. Thanks!