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#!/bin/sh
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#
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# Copyright 2015 Google LLC All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at:
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# -----------------------------------------
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# american fuzzy lop - QEMU build script
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# --------------------------------------
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#
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# Written by Andrew Griffiths <agriffiths@google.com> and
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# Michal Zalewski <lcamtuf@google.com>
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#
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# This script downloads, patches, and builds a version of QEMU with
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# minor tweaks to allow non-instrumented binaries to be run under
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# afl-fuzz.
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#
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# The modifications reside in patches/*. The standalone QEMU binary
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# will be written to ../afl-qemu-trace.
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#
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VERSION="2.10.0"
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QEMU_URL="http://download.qemu-project.org/qemu-${VERSION}.tar.xz"
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QEMU_SHA384="68216c935487bc8c0596ac309e1e3ee75c2c4ce898aab796faa321db5740609ced365fedda025678d072d09ac8928105"
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echo "================================================="
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echo "AFL binary-only instrumentation QEMU build script"
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echo "================================================="
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echo
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echo "[*] Performing basic sanity checks..."
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if [ ! "`uname -s`" = "Linux" ]; then
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echo "[-] Error: QEMU instrumentation is supported only on Linux."
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exit 1
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fi
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if [ ! -f "patches/afl-qemu-cpu-inl.h" -o ! -f "../config.h" ]; then
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echo "[-] Error: key files not found - wrong working directory?"
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exit 1
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fi
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if [ ! -f "../afl-showmap" ]; then
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echo "[-] Error: ../afl-showmap not found - compile AFL first!"
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exit 1
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fi
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for i in libtool wget python automake autoconf sha384sum bison iconv; do
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T=`which "$i" 2>/dev/null`
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if [ "$T" = "" ]; then
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echo "[-] Error: '$i' not found, please install first."
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exit 1
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fi
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done
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if [ ! -d "/usr/include/glib-2.0/" -a ! -d "/usr/local/include/glib-2.0/" ]; then
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echo "[-] Error: devel version of 'glib2' not found, please install first."
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exit 1
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fi
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if echo "$CC" | grep -qF /afl-; then
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echo "[-] Error: do not use afl-gcc or afl-clang to compile this tool."
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exit 1
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fi
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echo "[+] All checks passed!"
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ARCHIVE="`basename -- "$QEMU_URL"`"
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CKSUM=`sha384sum -- "$ARCHIVE" 2>/dev/null | cut -d' ' -f1`
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if [ ! "$CKSUM" = "$QEMU_SHA384" ]; then
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echo "[*] Downloading QEMU ${VERSION} from the web..."
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rm -f "$ARCHIVE"
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wget -O "$ARCHIVE" -- "$QEMU_URL" || exit 1
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CKSUM=`sha384sum -- "$ARCHIVE" 2>/dev/null | cut -d' ' -f1`
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fi
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if [ "$CKSUM" = "$QEMU_SHA384" ]; then
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echo "[+] Cryptographic signature on $ARCHIVE checks out."
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else
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echo "[-] Error: signature mismatch on $ARCHIVE (perhaps download error?)."
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exit 1
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fi
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echo "[*] Uncompressing archive (this will take a while)..."
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rm -rf "qemu-${VERSION}" || exit 1
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tar xf "$ARCHIVE" || exit 1
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echo "[+] Unpacking successful."
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echo "[*] Configuring QEMU for $CPU_TARGET..."
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ORIG_CPU_TARGET="$CPU_TARGET"
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test "$CPU_TARGET" = "" && CPU_TARGET="`uname -m`"
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test "$CPU_TARGET" = "i686" && CPU_TARGET="i386"
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cd qemu-$VERSION || exit 1
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echo "[*] Applying patches..."
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patch -p1 <../patches/elfload.diff || exit 1
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patch -p1 <../patches/cpu-exec.diff || exit 1
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patch -p1 <../patches/syscall.diff || exit 1
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patch -p1 <../patches/configure.diff || exit 1
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patch -p1 <../patches/memfd.diff || exit 1
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echo "[+] Patching done."
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# --enable-pie seems to give a couple of exec's a second performance
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# improvement, much to my surprise. Not sure how universal this is..
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CFLAGS="-O3 -ggdb" ./configure --disable-system \
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--enable-linux-user --disable-gtk --disable-sdl --disable-vnc \
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--target-list="${CPU_TARGET}-linux-user" --enable-pie --enable-kvm || exit 1
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echo "[+] Configuration complete."
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echo "[*] Attempting to build QEMU (fingers crossed!)..."
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make || exit 1
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echo "[+] Build process successful!"
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echo "[*] Copying binary..."
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cp -f "${CPU_TARGET}-linux-user/qemu-${CPU_TARGET}" "../../afl-qemu-trace" || exit 1
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cd ..
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ls -l ../afl-qemu-trace || exit 1
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echo "[+] Successfully created '../afl-qemu-trace'."
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if [ "$ORIG_CPU_TARGET" = "" ]; then
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echo "[*] Testing the build..."
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cd ..
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make >/dev/null || exit 1
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gcc test-instr.c -o test-instr || exit 1
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unset AFL_INST_RATIO
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# We shouldn't need the /dev/null hack because program isn't compiled with any
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# optimizations.
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echo 0 | ./afl-showmap -m none -Q -q -o .test-instr0 ./test-instr || exit 1
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echo 1 | ./afl-showmap -m none -Q -q -o .test-instr1 ./test-instr || exit 1
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rm -f test-instr
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cmp -s .test-instr0 .test-instr1
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DR="$?"
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rm -f .test-instr0 .test-instr1
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if [ "$DR" = "0" ]; then
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echo "[-] Error: afl-qemu-trace instrumentation doesn't seem to work!"
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exit 1
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fi
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echo "[+] Instrumentation tests passed. "
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echo "[+] All set, you can now use the -Q mode in afl-fuzz!"
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else
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echo "[!] Note: can't test instrumentation when CPU_TARGET set."
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echo "[+] All set, you can now (hopefully) use the -Q mode in afl-fuzz!"
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fi
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exit 0
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