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Commit 47ba63d

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tesujitesuji
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add a Dockerfile to build the disk image
Also use the archive link for `debootstrap` to avoid EOL links.
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4 files changed

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‎scripts/create-image/Dockerfile‎

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FROM ubuntu:24.04 AS base
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ENV DEBIAN_FRONTEND=noninteractive
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SHELL ["/bin/bash", "-c"]
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RUN <<EOF
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apt-get update
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apt-get install -y \
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ssh \
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debootstrap \
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e2fsprogs \
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$NULL
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apt-get clean
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ln -sf /bin/env /bin/sudo
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EOF
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ENV DIR=chroot
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ENV RELEASE=trixie
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ENV PREINSTALL_PKGS=openssh-server,curl,tar,gcc,libc6-dev,time,strace,sudo,less,psmisc,selinux-utils,policycoreutils,checkpolicy,selinux-policy-default,wget
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ENV ADD_PACKAGE="make,sysbench,git,vim,tmux,usbutils,tcpdump,net-tools"
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ENV FEATURE=minimal
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ENV SEEK=2047
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ENV PERF=false
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ENV IN_DOCKER=true
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# Use COPY after agt-get to allow caching apt
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WORKDIR /src
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COPY --chmod=0755 debootstrap.sh /src/
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RUN ./debootstrap.sh
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# will copy the img file to /mnt. Need --privilege flag for docker run.
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COPY --chmod=0755 configure.sh /src/
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CMD ["bash", "-x", "./configure.sh"]
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‎scripts/create-image/configure.sh‎

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#!/bin/bash
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# Copyright 2025 syzkaller project authors. All rights reserved.
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# Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
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# Set some defaults and enable promtless ssh to the machine for root.
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sudo sed -i '/^root/ { s/:x:/::/ }' $DIR/etc/passwd
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echo 'T0:23:respawn:/sbin/getty -L ttyS0 115200 vt100' | sudo tee -a $DIR/etc/inittab
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mkdir -p $DIR/etc/network
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printf '\nauto eth0\niface eth0 inet dhcp\n' | sudo tee -a $DIR/etc/network/interfaces
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echo '/dev/root / ext4 defaults 0 0' | sudo tee -a $DIR/etc/fstab
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echo 'debugfs /sys/kernel/debug debugfs defaults 0 0' | sudo tee -a $DIR/etc/fstab
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#echo 'securityfs /sys/kernel/security securityfs defaults 0 0' | sudo tee -a $DIR/etc/fstab
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#echo 'configfs /sys/kernel/config/ configfs defaults 0 0' | sudo tee -a $DIR/etc/fstab
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echo 'binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc defaults 0 0' | sudo tee -a $DIR/etc/fstab
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echo "kernel.printk = 7 4 1 3" | sudo tee -a $DIR/etc/sysctl.conf
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echo 'debug.exception-trace = 0' | sudo tee -a $DIR/etc/sysctl.conf
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echo "net.core.bpf_jit_enable = 1" | sudo tee -a $DIR/etc/sysctl.conf
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echo "net.core.bpf_jit_kallsyms = 1" | sudo tee -a $DIR/etc/sysctl.conf
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echo "net.core.bpf_jit_harden = 0" | sudo tee -a $DIR/etc/sysctl.conf
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echo "kernel.softlockup_all_cpu_backtrace = 1" | sudo tee -a $DIR/etc/sysctl.conf
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echo "kernel.kptr_restrict = 0" | sudo tee -a $DIR/etc/sysctl.conf
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echo "kernel.watchdog_thresh = 60" | sudo tee -a $DIR/etc/sysctl.conf
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echo "net.ipv4.ping_group_range = 0 65535" | sudo tee -a $DIR/etc/sysctl.conf
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echo -en "127.0.0.1\tlocalhost\n" | sudo tee $DIR/etc/hosts
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echo "nameserver 8.8.8.8" | sudo tee -a $DIR/etc/resolve.conf
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echo "pwn" | sudo tee $DIR/etc/hostname
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# Add perf support
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if [ "$PERF" == "true" ]; then
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cp -r $KERNEL $DIR/tmp/
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sudo chroot $DIR /bin/bash -c "apt-get update; apt-get install -y flex bison python-dev libelf-dev libunwind8-dev libaudit-dev libslang2-dev libperl-dev binutils-dev liblzma-dev libnuma-dev"
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sudo chroot $DIR /bin/bash -c "cd /tmp/linux/tools/perf/; make"
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sudo chroot $DIR /bin/bash -c "cp /tmp/linux/tools/perf/perf /usr/bin/"
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rm -r $DIR/tmp/linux
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fi
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# create a default user called user
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echo "user::1000:1000:user:/home/user:/bin/bash" | sudo tee -a $DIR/etc/passwd
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echo "user:x:1000:" | sudo tee -a $DIR/etc/group
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sudo mkdir -p $DIR/home/user/.ssh
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sudo chown -R 1000:1000 $DIR/home/user
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# install python3
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sudo chroot $DIR /bin/bash -c "apt-get update"
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sudo chroot $DIR /bin/bash -c "apt-get install -y python3 && ln -s /usr/bin/python3 /usr/bin/python"
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# create ssh key and save it
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ssh-keygen -f $RELEASE.id_rsa -t rsa -N ''
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sudo mkdir -p $DIR/root/.ssh/
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cat $RELEASE.id_rsa.pub | sudo tee $DIR/root/.ssh/authorized_keys
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cat $RELEASE.id_rsa.pub | sudo tee $DIR/home/user/.ssh/authorized_keys
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sudo chown -R 1000:1000 $DIR/home/user
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# Build a disk image
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dd if=/dev/zero of=$RELEASE.img bs=1M seek=$SEEK count=1
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sudo mkfs.ext4 -F $RELEASE.img
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sudo mkdir -p /fs/$DIR /mnt
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sudo mount -o loop $RELEASE.img /fs/$DIR
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sudo cp -a $DIR/. /fs/$DIR/.
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sudo umount /fs/$DIR
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if [ "$IN_DOCKER" = true ]; then
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cp $RELEASE.* /mnt
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fi

‎scripts/create-image/create-image.sh‎

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@@ -20,6 +20,7 @@ RELEASE=trixie
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FEATURE=minimal
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SEEK=2047
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PERF=false
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IN_DOCKER=false
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# Display help function
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display_help() {
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fi
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# If full feature is chosen, install more packages
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if [ $FEATURE = "full" ]; then
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if [ "$FEATURE" = "full" ]; then
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PREINSTALL_PKGS=$PREINSTALL_PKGS","$ADD_PACKAGE
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fi
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sudo rm -rf $DIR
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mkdir -p $DIR
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sudo debootstrap --include=$PREINSTALL_PKGS $RELEASE $DIR
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source ./debootstrap.sh
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source ./configure.sh
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# Set some defaults and enable promtless ssh to the machine for root.
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sudo sed -i '/^root/ { s/:x:/::/ }' $DIR/etc/passwd
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echo 'T0:23:respawn:/sbin/getty -L ttyS0 115200 vt100' | sudo tee -a $DIR/etc/inittab
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printf '\nauto eth0\niface eth0 inet dhcp\n' | sudo tee -a $DIR/etc/network/interfaces
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echo '/dev/root / ext4 defaults 0 0' | sudo tee -a $DIR/etc/fstab
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echo 'debugfs /sys/kernel/debug debugfs defaults 0 0' | sudo tee -a $DIR/etc/fstab
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#echo 'securityfs /sys/kernel/security securityfs defaults 0 0' | sudo tee -a $DIR/etc/fstab
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#echo 'configfs /sys/kernel/config/ configfs defaults 0 0' | sudo tee -a $DIR/etc/fstab
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echo 'binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc defaults 0 0' | sudo tee -a $DIR/etc/fstab
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echo "kernel.printk = 7 4 1 3" | sudo tee -a $DIR/etc/sysctl.conf
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echo 'debug.exception-trace = 0' | sudo tee -a $DIR/etc/sysctl.conf
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echo "net.core.bpf_jit_enable = 1" | sudo tee -a $DIR/etc/sysctl.conf
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echo "net.core.bpf_jit_kallsyms = 1" | sudo tee -a $DIR/etc/sysctl.conf
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echo "net.core.bpf_jit_harden = 0" | sudo tee -a $DIR/etc/sysctl.conf
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echo "kernel.softlockup_all_cpu_backtrace = 1" | sudo tee -a $DIR/etc/sysctl.conf
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echo "kernel.kptr_restrict = 0" | sudo tee -a $DIR/etc/sysctl.conf
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echo "kernel.watchdog_thresh = 60" | sudo tee -a $DIR/etc/sysctl.conf
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echo "net.ipv4.ping_group_range = 0 65535" | sudo tee -a $DIR/etc/sysctl.conf
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echo -en "127.0.0.1\tlocalhost\n" | sudo tee $DIR/etc/hosts
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echo "nameserver 8.8.8.8" | sudo tee -a $DIR/etc/resolve.conf
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echo "pwn" | sudo tee $DIR/etc/hostname
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# Add perf support
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if [ $PERF = "true" ]; then
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cp -r $KERNEL $DIR/tmp/
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sudo chroot $DIR /bin/bash -c "apt-get update; apt-get install -y flex bison python-dev libelf-dev libunwind8-dev libaudit-dev libslang2-dev libperl-dev binutils-dev liblzma-dev libnuma-dev"
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sudo chroot $DIR /bin/bash -c "cd /tmp/linux/tools/perf/; make"
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sudo chroot $DIR /bin/bash -c "cp /tmp/linux/tools/perf/perf /usr/bin/"
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rm -r $DIR/tmp/linux
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fi
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# create a default user called user
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echo "user::1000:1000:user:/home/user:/bin/bash" | sudo tee -a $DIR/etc/passwd
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echo "user:x:1000:" | sudo tee -a $DIR/etc/group
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sudo mkdir -p $DIR/home/user/.ssh
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sudo chown -R 1000:1000 $DIR/home/user
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# install python3
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sudo chroot $DIR /bin/bash -c "apt-get update"
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sudo chroot $DIR /bin/bash -c "apt-get install -y python3 && ln -s /usr/bin/python3 /usr/bin/python"
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# create ssh key and save it
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ssh-keygen -f $RELEASE.id_rsa -t rsa -N ''
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sudo mkdir -p $DIR/root/.ssh/
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cat $RELEASE.id_rsa.pub | sudo tee $DIR/root/.ssh/authorized_keys
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cat $RELEASE.id_rsa.pub | sudo tee $DIR/home/user/.ssh/authorized_keys
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sudo chown -R 1000:1000 $DIR/home/user
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# Build a disk image
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dd if=/dev/zero of=$RELEASE.img bs=1M seek=$SEEK count=1
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sudo mkfs.ext4 -F $RELEASE.img
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sudo mkdir -p /mnt/$DIR
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sudo mount -o loop $RELEASE.img /mnt/$DIR
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sudo cp -a $DIR/. /mnt/$DIR/.
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sudo umount /mnt/$DIR

‎scripts/create-image/debootstrap.sh‎

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#!/bin/bash
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# Copyright 2025 syzkaller project authors. All rights reserved.
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# Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
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sudo rm -rf $DIR
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mkdir -p $DIR
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if ! \
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sudo debootstrap --include=$PREINSTALL_PKGS $RELEASE $DIR; \
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then
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sudo debootstrap --no-check-gpg --include=$PREINSTALL_PKGS $RELEASE $DIR \
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http://archive.debian.org/debian
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fi

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