Add script to create ubuntu debootstrap rootfs

Author: gsingh93

.github/workflows/build.yml

@@ -115,6 +115,7 @@ jobs:
       matrix:
         kernel: [{ack: 0, version: 5.10.y}, {ack: 0, version: 5.15.y}, {ack: 0, version: 6.1.y}, {ack: 1, version: android13-5.10-lts}]
         arch: [arm64, x86_64]
+    timeout-minutes: 20
     runs-on: ubuntu-22.04
     env:
       ACK: ${{ matrix.kernel.ack }}
@@ -125,15 +126,19 @@ jobs:
     - name: Download all workflow run artifacts
       uses: actions/download-artifact@v3
 
+    - name: Install common dependencies
+      shell: bash
+      run: sudo apt update && sudo apt install -y debootstrap
+
     - name: Install x86_64 dependencies
       if: ${{ matrix.arch == 'x86_64' }}
       shell: bash
-      run: sudo apt update && sudo apt install -y qemu-system-x86
+      run: sudo apt install -y qemu-system-x86
 
     - name: Install arm64 dependencies
       if: ${{ matrix.arch == 'arm64' }}
       shell: bash
-      run: sudo apt update && sudo apt install -y qemu-system-arm
+      run: sudo apt install -y qemu-system-arm qemu-user-static binfmt-support
 
     - name: Get real kernel version
       run: |
@@ -175,26 +180,26 @@ jobs:
 
     - name: Initialize rootfs and initramfs
       run: |
+        set -x
         make rootfs-init
-        ROOTFS=./alpine-${{ matrix.arch }} make rootfs-init
+        ROOTFS=./alpine-${{ matrix.arch }}.img make rootfs-init
 
-        make cpio
-        ROOTFS_DIR=./rootfs/alpine-${{ matrix.arch }} make cpio
+        scripts/ubuntu_debootstrap.sh jammy ${{ matrix.arch }}
+        SUDO=1 ROOTFS_DIR=./rootfs/ubuntu-jammy-${{ matrix.arch }} CPIO_FILE=ubuntu-jammy-${{ matrix.arch }}.cpio.gz make rootfs-overlay
 
     - name: Setup shared/init.sh
       run: |
         mkdir shared
         echo poweroff > shared/init.sh
         chmod +x shared/init.sh
 
-    - run: ls -lR
-
     - name: Run kernel
       run: |
         QEMU_KERNEL_IMAGE=./kernel-image/$IMAGE_NAME make run
-        QEMU_KERNEL_IMAGE=./kernel-image/$IMAGE_NAME ROOTFS=./rootfs-${{ matrix.arch }} make run
+        QEMU_KERNEL_IMAGE=./kernel-image/$IMAGE_NAME ROOTFS=./rootfs/ubuntu-jammy-${{ matrix.arch }}.img make run
         QEMU_KERNEL_IMAGE=./kernel-image/$IMAGE_NAME INITRD=1 make run
-        QEMU_KERNEL_IMAGE=./kernel-image/$IMAGE_NAME CPU=2 MEM=2048M QEMU_EXTRA_ARGS="" QEMU_EXTRA_KERNEL_CMDLINE="nokaslr" make run
+        QEMU_KERNEL_IMAGE=./kernel-image/$IMAGE_NAME INITRD=./ubuntu-jammy-${{ matrix.arch }}.cpio.gz make run
+        QEMU_KERNEL_IMAGE=./kernel-image/$IMAGE_NAME CPU=2 MEM=2048M QEMU_EXTRA_ARGS="" QEMU_EXTRA_KERNEL_CMDLINE="nokaslr" ROOTFS=./alpine-${{ matrix.arch }}.img make run
 
     - name: Upload rootfs artifact
       uses: actions/upload-artifact@v3

.gitignore

@@ -1,6 +1,7 @@
 /rootfs/*.img
 /rootfs/*.cpio.gz
 /rootfs/alpine-*/
+/rootfs/ubuntu-*/
 
 /toolchain
 /shared

README.md

@@ -7,7 +7,7 @@ The only supported host OS is Ubuntu 22.04, things may or may not work on any ot
 First install the dependencies and clone the project:
 ```bash
 sudo apt update
-sudo apt install -y bc bison build-essential flex git libelf-dev libssl-dev ncurses-dev qemu qemu-system-x86 qemu-system-arm llvm clang clang-tools lld lz4 binutils-aarch64-linux-gnu gcc-aarch64-linux-gnu pahole
+sudo apt install -y bc bison build-essential flex git libelf-dev libssl-dev ncurses-dev gdb gdb-multiarch qemu qemu-system-x86 qemu-system-arm qemu-user-static binfmt-support llvm clang clang-tools lld lz4 binutils-aarch64-linux-gnu gcc-aarch64-linux-gnu pahole dwarves
 git clone --recursive https://github.com/gsingh93/linux-exploit-dev-env
 cd linux-exploit-dev-env
 ```

config/rootfs-overlay/etc/systemd/system/multi-user.target.wants/setup.service

@@ -0,0 +1 @@
+/etc/systemd/system/setup.service

config/rootfs-overlay/etc/systemd/system/[email protected]/override.conf

@@ -0,0 +1,4 @@
+[Service]
+Type=simple
+ExecStart=
+ExecStart=-/sbin/agetty --autologin root --noclear %I 38400 linux

config/rootfs-overlay/etc/systemd/system/setup.service

@@ -0,0 +1,19 @@
+[Unit]
+Documentation=man:systemd-sysv-generator(8)
+SourcePath=/etc/init.d/setup
+Description=Linux Exploit Dev Environment Setup
+
+[Service]
+Type=forking
+Restart=no
+TimeoutSec=5min
+IgnoreSIGPIPE=no
+KillMode=process
+GuessMainPID=no
+RemainAfterExit=yes
+SuccessExitStatus=5 6
+ExecStart=/etc/init.d/setup start
+ExecStop=/etc/init.d/setup stop
+
+[Install]
+WantedBy=multi-user.target

scripts/ubuntu_debootstrap.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+set -o errexit
+
+CWD=$(dirname -- "$0")
+ROOT_DIR="$(realpath ${CWD}/..)"
+
+NAME="${1:-jammy}"
+ARCH="${2:-x86_64}"
+
+DIR="${ROOT_DIR}/rootfs/ubuntu-${NAME}-${ARCH}"
+
+if [[ "$ARCH" == x86_64 ]]; then
+    ARCH=amd64
+elif [[ "$ARCH" != arm64 ]]; then
+    echo "usage: $0 [NAME] [x86_64 | arm64]"
+    exit 1
+fi
+
+mkdir -p $DIR
+sudo debootstrap --arch $ARCH $NAME $DIR
+
+echo "Ubuntu ${NAME} debootstrap installed in ${DIR}"