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| 1 | +#!/usr/bin/env bash |
| 2 | +# Copyright 2016 syzkaller project authors. All rights reserved. |
| 3 | +# Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file. |
| 4 | + |
| 5 | +# create-image.sh creates a minimal Debian Linux image suitable for syzkaller. |
| 6 | + |
| 7 | +set -eux |
| 8 | + |
| 9 | +# Create a minimal Debian distribution in a directory. |
| 10 | +DIR=chroot |
| 11 | +PREINSTALL_PKGS=openssh-server,curl,tar,gcc,libc6-dev,time,strace,sudo,less,psmisc,selinux-utils,policycoreutils,checkpolicy,selinux-policy-default,firmware-atheros,debian-ports-archive-keyring |
| 12 | + |
| 13 | +# If ADD_PACKAGE is not defined as an external environment variable, use our default packages |
| 14 | +if [ -z ${ADD_PACKAGE+x} ]; then |
| 15 | + ADD_PACKAGE="make,sysbench,git,vim,tmux,usbutils,tcpdump" |
| 16 | +fi |
| 17 | + |
| 18 | +# Variables affected by options |
| 19 | +ARCH=$(uname -m) |
| 20 | +RELEASE=bullseye |
| 21 | +FEATURE=minimal |
| 22 | +SEEK=2047 |
| 23 | +PERF=false |
| 24 | +IMG_HOSTNAME="localhost" |
| 25 | + |
| 26 | +# Display help function |
| 27 | +display_help() { |
| 28 | + echo "Usage: $0 [option...] " >&2 |
| 29 | + echo |
| 30 | + echo " -a, --arch Set architecture" |
| 31 | + echo " -d, --distribution Set on which debian distribution to create" |
| 32 | + echo " -f, --feature Check what packages to install in the image, options are minimal, full" |
| 33 | + echo " -n, --hostname Set hostname" |
| 34 | + echo " -s, --seek Image size (MB), default 2048 (2G)" |
| 35 | + echo " -h, --help Display help message" |
| 36 | + echo " -p, --add-perf Add perf support with this option enabled. Please set envrionment variable \$KERNEL at first" |
| 37 | + echo |
| 38 | +} |
| 39 | + |
| 40 | +while true; do |
| 41 | + if [ $# -eq 0 ];then |
| 42 | + echo $# |
| 43 | + break |
| 44 | + fi |
| 45 | + case "$1" in |
| 46 | + -h | --help) |
| 47 | + display_help |
| 48 | + exit 0 |
| 49 | + ;; |
| 50 | + -a | --arch) |
| 51 | + ARCH=$2 |
| 52 | + shift 2 |
| 53 | + ;; |
| 54 | + -d | --distribution) |
| 55 | + RELEASE=$2 |
| 56 | + shift 2 |
| 57 | + ;; |
| 58 | + -f | --feature) |
| 59 | + FEATURE=$2 |
| 60 | + shift 2 |
| 61 | + ;; |
| 62 | + -n | --hostname) |
| 63 | + IMG_HOSTNAME=$2 |
| 64 | + shift 2 |
| 65 | + ;; |
| 66 | + -s | --seek) |
| 67 | + SEEK=$(($2 - 1)) |
| 68 | + shift 2 |
| 69 | + ;; |
| 70 | + -p | --add-perf) |
| 71 | + PERF=true |
| 72 | + shift 1 |
| 73 | + ;; |
| 74 | + -*) |
| 75 | + echo "Error: Unknown option: $1" >&2 |
| 76 | + exit 1 |
| 77 | + ;; |
| 78 | + *) # No more options |
| 79 | + break |
| 80 | + ;; |
| 81 | + esac |
| 82 | +done |
| 83 | + |
| 84 | +# Handle cases where qemu and Debian use different arch names |
| 85 | +case "$ARCH" in |
| 86 | + ppc64le) |
| 87 | + DEBARCH=ppc64el |
| 88 | + ;; |
| 89 | + aarch64) |
| 90 | + DEBARCH=arm64 |
| 91 | + ;; |
| 92 | + arm) |
| 93 | + DEBARCH=armel |
| 94 | + ;; |
| 95 | + x86_64) |
| 96 | + DEBARCH=amd64 |
| 97 | + ;; |
| 98 | + *) |
| 99 | + DEBARCH=$ARCH |
| 100 | + ;; |
| 101 | +esac |
| 102 | + |
| 103 | +# Foreign architecture |
| 104 | + |
| 105 | +FOREIGN=false |
| 106 | +if [ $ARCH != $(uname -m) ]; then |
| 107 | + # i386 on an x86_64 host is exempted, as we can run i386 binaries natively |
| 108 | + if [ $ARCH != "i386" -o $(uname -m) != "x86_64" ]; then |
| 109 | + FOREIGN=true |
| 110 | + fi |
| 111 | +fi |
| 112 | + |
| 113 | +if [ $FOREIGN = "true" ]; then |
| 114 | + # Check for according qemu static binary |
| 115 | + if ! which qemu-$ARCH-static; then |
| 116 | + echo "Please install qemu static binary for architecture $ARCH (package 'qemu-user-static' on Debian/Ubuntu/Fedora)" |
| 117 | + exit 1 |
| 118 | + fi |
| 119 | + # Check for according binfmt entry |
| 120 | + if [ ! -r /proc/sys/fs/binfmt_misc/qemu-$ARCH ]; then |
| 121 | + echo "binfmt entry /proc/sys/fs/binfmt_misc/qemu-$ARCH does not exist" |
| 122 | + exit 1 |
| 123 | + fi |
| 124 | +fi |
| 125 | + |
| 126 | +# Double check KERNEL when PERF is enabled |
| 127 | +if [ $PERF = "true" ] && [ -z ${KERNEL+x} ]; then |
| 128 | + echo "Please set KERNEL environment variable when PERF is enabled" |
| 129 | + exit 1 |
| 130 | +fi |
| 131 | + |
| 132 | +# If full feature is chosen, install more packages |
| 133 | +if [ $FEATURE = "full" ]; then |
| 134 | + PREINSTALL_PKGS=$PREINSTALL_PKGS","$ADD_PACKAGE |
| 135 | +fi |
| 136 | + |
| 137 | +sudo rm -rf $DIR |
| 138 | +sudo mkdir -p $DIR |
| 139 | +sudo chmod 0755 $DIR |
| 140 | + |
| 141 | +# 1. debootstrap stage |
| 142 | + |
| 143 | +DEBOOTSTRAP_PARAMS="--arch=$DEBARCH --include=$PREINSTALL_PKGS --components=main,contrib,non-free,non-free-firmware $RELEASE $DIR" |
| 144 | +if [ $FOREIGN = "true" ]; then |
| 145 | + DEBOOTSTRAP_PARAMS="--foreign $DEBOOTSTRAP_PARAMS" |
| 146 | +fi |
| 147 | + |
| 148 | +# riscv64 is hosted in the debian-ports repository |
| 149 | +# debian-ports doesn't include non-free, so we exclude firmware-atheros |
| 150 | +if [ $DEBARCH == "riscv64" ]; then |
| 151 | + DEBOOTSTRAP_PARAMS="--keyring /usr/share/keyrings/debian-ports-archive-keyring.gpg --exclude firmware-atheros $DEBOOTSTRAP_PARAMS http://deb.debian.org/debian-ports" |
| 152 | +fi |
| 153 | +sudo --preserve-env=http_proxy,https_proxy,ftp_proxy,no_proxy debootstrap $DEBOOTSTRAP_PARAMS |
| 154 | + |
| 155 | +# 2. debootstrap stage: only necessary if target != host architecture |
| 156 | + |
| 157 | +if [ $FOREIGN = "true" ]; then |
| 158 | + sudo cp $(which qemu-$ARCH-static) $DIR/$(which qemu-$ARCH-static) |
| 159 | + sudo chroot $DIR /bin/bash -c "/debootstrap/debootstrap --second-stage" |
| 160 | +fi |
| 161 | + |
| 162 | +# Set some defaults and enable promptless ssh to the machine for root. |
| 163 | +sudo sed -i '/^root/ { s/:x:/::/ }' $DIR/etc/passwd |
| 164 | +echo 'T0:23:respawn:/sbin/getty -L ttyS0 115200 vt100' | sudo tee -a $DIR/etc/inittab |
| 165 | +printf '\nauto eth0\niface eth0 inet dhcp\n' | sudo tee -a $DIR/etc/network/interfaces |
| 166 | +echo '/dev/root / ext4 defaults 0 0' | sudo tee -a $DIR/etc/fstab |
| 167 | +echo 'debugfs /sys/kernel/debug debugfs defaults 0 0' | sudo tee -a $DIR/etc/fstab |
| 168 | +echo 'securityfs /sys/kernel/security securityfs defaults 0 0' | sudo tee -a $DIR/etc/fstab |
| 169 | +echo 'configfs /sys/kernel/config/ configfs defaults 0 0' | sudo tee -a $DIR/etc/fstab |
| 170 | +echo 'binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc defaults 0 0' | sudo tee -a $DIR/etc/fstab |
| 171 | +echo -en "127.0.0.1\tlocalhost\n" | sudo tee $DIR/etc/hosts |
| 172 | +echo "nameserver 8.8.8.8" | sudo tee -a $DIR/etc/resolve.conf |
| 173 | +echo $IMG_HOSTNAME | sudo tee $DIR/etc/hostname |
| 174 | +ssh-keygen -f $RELEASE.id_rsa -t rsa -N '' |
| 175 | +sudo mkdir -p $DIR/root/.ssh/ |
| 176 | +cat $RELEASE.id_rsa.pub | sudo tee $DIR/root/.ssh/authorized_keys |
| 177 | + |
| 178 | +# Add perf support |
| 179 | +if [ $PERF = "true" ]; then |
| 180 | + cp -r $KERNEL $DIR/tmp/ |
| 181 | + BASENAME=$(basename $KERNEL) |
| 182 | + 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" |
| 183 | + sudo chroot $DIR /bin/bash -c "cd /tmp/$BASENAME/tools/perf/; make" |
| 184 | + sudo chroot $DIR /bin/bash -c "cp /tmp/$BASENAME/tools/perf/perf /usr/bin/" |
| 185 | + rm -r $DIR/tmp/$BASENAME |
| 186 | +fi |
| 187 | + |
| 188 | +# Add udev rules for custom drivers. |
| 189 | +# Create a /dev/vim2m symlink for the device managed by the vim2m driver |
| 190 | +echo 'ATTR{name}=="vim2m", SYMLINK+="vim2m"' | sudo tee -a $DIR/etc/udev/rules.d/50-udev-default.rules |
| 191 | + |
| 192 | +# Build a disk image |
| 193 | +dd if=/dev/zero of=$RELEASE.img bs=1M seek=$SEEK count=1 |
| 194 | +sudo mkfs.ext4 -F $RELEASE.img |
| 195 | +sudo mkdir -p /mnt/$DIR |
| 196 | +sudo mount -o loop $RELEASE.img /mnt/$DIR |
| 197 | +sudo cp -a $DIR/. /mnt/$DIR/. |
| 198 | +sudo umount /mnt/$DIR |
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