Dockerfile

FROM ubuntu:20.04

# Setup timezone for avoid tzdata hang
ENV TZ=America/New_York
ENV PYTHONIOENCODING=utf8
RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone

RUN apt-get update && apt-get install -y \
    wget git qemu-system qemu-system-x86 qemu-utils python3 python3-pip \
    gcc gcc-x86-64-linux-gnu binutils-x86-64-linux-gnu libc6-dev-amd64-cross \
    libelf-dev libssl-dev bc flex bison vim bzip2 cpio gdb gdb-multiarch curl \
    && rm -rf /var/lib/apt/lists/*

RUN if [ "$(uname -m)" != "x86_64" ]; then \
        mkdir -p /usr/lib/x86_64-linux-gnu; \
        for lib in /usr/x86_64-linux-gnu/lib/libm-*.a /usr/x86_64-linux-gnu/lib/libmvec*.a; do \
            if [ -e "$lib" ]; then \
                ln -sf "$lib" /usr/lib/x86_64-linux-gnu/; \
            fi; \
        done; \
    fi

# Download kernel
RUN mkdir -p /sources
WORKDIR /sources
RUN git clone --depth=1 -b v6.6 https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
RUN wget https://busybox.net/downloads/busybox-1.32.1.tar.bz2
RUN tar xvjf busybox-1.32.1.tar.bz2

# initial build, so as to speed up development
COPY ./scripts/build-k.sh /sources
RUN if [ "$(uname -m)" = "x86_64" ]; then /sources/build-k.sh; else echo "Skipping initial kernel build on non-amd64"; fi

# Qemu-KVM, needed for testing kernels inside a VM
RUN apt-get update \
    && DEBIAN_FRONTEND=noninteractive apt-get -y install \
    iptables \
    libgl1-mesa-dri \
    libgl1-mesa-glx \
    libvirt-daemon-system \
    qemu-kvm \
    virtinst \
    virt-viewer \
    libcanberra-gtk-module \
    libcanberra-gtk3-module \
    packagekit-gtk3-module \
    && apt-get -y autoremove \
    && apt-get -y clean \
    && rm -rf /var/lib/apt/lists/*

# Setup GEF
RUN wget -O /root/.gdbinit-gef.py -q http://gef.blah.cat/py 
COPY ./scripts/.gdbinit_gef /sources/.gdbinit_gef
COPY ./scripts/.gdbinit_vscode /sources/.gdbinit_vscode
COPY ./scripts/.gdbinit_vscode /root/.gdbinit
ENV LC_CTYPE=C.UTF-8
ENV LANG=C.UTF-8

# Setup vscode stuff
WORKDIR /sources/linux
RUN git clone --depth=1 https://github.com/amezin/vscode-linux-kernel.git .vscode
RUN rm -rf .vscode/.git
RUN if [ "$(uname -m)" = "x86_64" ]; then python3 .vscode/generate_compdb.py; else echo "Skipping compdb generation on non-amd64 (run after first kernel build)"; fi
COPY .vscode/tasks.json .vscode/tasks.json
COPY .vscode/launch.json .vscode/launch.json

# Build the FS
WORKDIR /sources
COPY ./scripts/build-fs.sh /sources
COPY ./scripts/init /scripts/init
RUN if [ "$(uname -m)" = "x86_64" ]; then /sources/build-fs.sh; else echo "Skipping initial initramfs build on non-amd64"; fi