ReDroid Kernel Modules

This repository contains the kernel modules necessary to run ReDroid instances.

Currently, 4.14+ kernel is supported. Many Linux distributions already meet this requirement (Ubuntu 16.04+, AmazonLinux 2, Alibaba Cloud Linux 2 etc.). If you are using customized kernel, make sure the corresponding kernel headers are present in your system.

for kernel >= 5.7, please install either by building customized kernel or modprobe (Ubuntu etc.)

Manual

# Ubuntu 16.04 / 18.04 / 20.04
sudo apt-get install -y git kmod make gcc linux-headers-`uname -r`
sudo make # build kernel modules
sudo make install # build and install *unsigned* kernel modules

# Ubuntu 20.04+ (kernel 5.0+)
sudo modprobe ashmem_linux
sudo modprobe binder_linux devices=binder,hwbinder,vndbinder

# AmazonLinux2
git checkout origin/amazonlinux2
sudo yum install git kmod make "kernel-devel-uname-r == `uname -r`"
sudo make # build kernel modules
sudo make install # build and install *unsigned* kernel modules

# Alibaba Cloud Linux 2
git checkout origin/alibabalinux2
sudo yum install git kmod make "kernel-devel-uname-r == `uname -r`"
sudo make # build kernel modules
sudo make install # build and install *unsigned* kernel modules

# Alibaba Cloud Linux 3
git checkout origin/alibabalinux3
sudo yum install git kmod make "kernel-devel-uname-r == `uname -r`"
sudo make # build kernel modules
sudo make install # build and install *unsigned* kernel modules

# openEuler 20.03 / kernel 4.19
git checkout origin/openeuler2003
sudo yum install gcc kernel-devel
sudo KDIR=/usr/src/kernels/<VER> make install

# check modules status
lsmod | grep -e ashmem_linux -e binder_linux
# example output:
# binder_linux          147456  79
# ashmem_linux           16384  23

# we can also check like this
grep binder /proc/filesystems # output should like: nodev	binder
grep ashmem /proc/misc # output should like: 56 ashmem

Please refer the related docs if you want to sign these kernel modules.

DKMS

DKMS can help to automatically build and deploy kernel modules if kernel upgraded. You need to have dkms and linux-headers on your system. You can install them by sudo apt install dkms or sudo yum install dkms.

Package name for linux-headers varies on different distributions, e.g. linux-headers-generic (Ubuntu), kernel-devel (AmazonLinux2)

# prepare config files
cp redroid.conf /etc/modules-load.d/ # auto load kernel modules after system boot
cp 99-redroid.rules /lib/udev/rules.d/ # change device node permissions

# prepare kernel modules source
cp -rT ashmem /usr/src/redroid-ashmem-1
cp -rT binder /usr/src/redroid-binder-1

# install via dkms
dkms install redroid-ashmem/1
dkms install redroid-binder/1

Docker

It's possible to make a script, add install these kernel moduels by docker

docker run --rm --cap-add CAP_SYS_MODULE --entrypoint /bin/bash NODE_OS -c "`curl -s <link>`"
# for example, if you are running under ubuntu 18.04, please change NODE_OS to *ubunut:18.04*

K8S

create overlay of your node OS, see deploy/k8s/overlays/ubuntu1804 as an example. then run kubectl apply -k <YOUR_OVERLAY_PATH>

Custom Kernel

If use custom kernel (5.0+), you can enable binderfs and ashmem configs; So the kernel modules in this repo are not needed any more.