Compiling LKM enabled kernel for android emulator

[ciit]

Hello, just need someone to point me in the right direction. I want to compile a kernel which I can run on the android emulator with support for Loadable Kernel Modules (LKM). As of now, I have tried almost 50 combinations of compiling kernels with CLANG and none of them seem to work with any of the AVDS (arm or Intel). 

I have tried the following steps: 

1- Downloaded kernels from google repositories.

2- Building those kernels with Clang compiler (aarch-64-linux-gnu)

3- Running the android emulator with the compiled kernel. 

However, either the kernels don't compile or even if they do, the emulator just gives a black screen.

Any help would be really appreciated. 

[Nathan Chancellor]

It would be helpful to post the compiler errors, your make command, and
the toolchains used. I suspect that the errors are probably related to
it not working at runtime. Additionally, they usually recommend using
Cuttlefish for kernel hacking, rather than the emulator.

Cheers,
Nathan

[ciit]

Firstly thank you very much for taking the time to reply.

Initially I followed you're guide ! ( https://forum.xda-developers.com/android/software-hacking/reference-how-to-compile-android-kernel-t3627297 )

and used the tool chain ( git clone https://android.googlesource.com/platform/prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9 ) but the files are broken

and it failed to compile. I also tried building pixel2 kernel (unsure  if that would  on avd emulator) located at your repo on git. I've attached an image of my avds. 

if I were to run cuttlefish that would be really awesome as I want to extract RAM dumps using LiME and that would provide with more forensically sound results.

Thanks again for your reply Mr. Nathan I was surprised that such a senior dev would take the time to write back.  

Latest Attempt 1:

 

Kernel: wahoo-android-msm-wahoo-4.4

toolchain:  gcc-linaro-7.5.0-2019.12-i686_aarch64-linux-gnu

comamnds: 

export CROSS_COMPILE = /path to tool chain/

make clean

make mrproper

make wahoo_deconfig

make menuconfig (to enable LKM)

-j12 (fails to build an image, gives no error)

 

Latest Attempt 2:

 

Kernel: git clone https://android.googlesource.com/kernel/goldfish/ -b android-goldfish-4.9-dev

toolchain:  gcc-linaro-7.5.0-2019.12-i686_aarch64-linux-gnu

comamnds: 

export CROSS_COMPILE = /path to tool chain/

make clean

make mrproper

make wahoo_deconfig

make menuconfig (to enable LKM)

-j12 

compiles fine but when i run on emulator  it gives error  ( qemu: linux kernel too old to load a ram disk )

[ciit]

EDIT

Latest Attempt 3:

 

Kernel: git clone https://android.googlesource.com/kernel/common -b cuttlefish-4.4

toolchain:  gcc-linaro-7.5.0-2019.12-i686_aarch64-linux-gnu

comamnds: 

export CROSS_COMPILE = /path to tool chain/

make clean

make mrproper

make cuttlefish_defconfig

make menuconfig (to enable LKM)

make -j12

ERROR: 

duke@duke:~$ emulator -avd Nexus5X2 -kernel /home/duke/Downloads/cuttlefish/arch/arm64/boot/Image

emulator: WARNING: encryption is off

emulator: ERROR: AdbHostServer.cpp:102: Unable to connect to adb daemon on port: 5037

queryCoreProfileSupport: swap interval not found

failed to create drawable

failed to create drawable

failed to create drawable

failed to create drawable

failed to create drawable

failed to create drawable

failed to create drawable

failed to create drawable

[ciit]

stackoverflow: https://stackoverflow.com/questions/59799980/compile-avd-kernel-for-memory-forensics-with-lime