1#!/bin/bash -e 2# 3# OSS-Fuzz build script. See: 4# https://google.github.io/oss-fuzz/getting-started/new-project-guide/#buildsh 5# 6# The file is consumed by: 7# https://github.com/google/oss-fuzz/blob/master/projects/qemu/Dockerfiles 8# 9# This code is licensed under the GPL version 2 or later. See 10# the COPYING file in the top-level directory. 11# 12 13# build project 14# e.g. 15# ./autogen.sh 16# ./configure 17# make -j$(nproc) all 18 19# build fuzzers 20# e.g. 21# $CXX $CXXFLAGS -std=c++11 -Iinclude \ 22# /path/to/name_of_fuzzer.cc -o $OUT/name_of_fuzzer \ 23# -fsanitize=fuzzer /path/to/library.a 24 25fatal () { 26 echo "Error : ${*}, exiting." 27 exit 1 28} 29 30OSS_FUZZ_BUILD_DIR="./build-oss-fuzz/" 31 32# There seems to be a bug in clang-11 (used for builds on oss-fuzz) : 33# accel/tcg/cputlb.o: In function `load_memop': 34# accel/tcg/cputlb.c:1505: undefined reference to `qemu_build_not_reached' 35# 36# When building with optimization, the compiler is expected to prove that the 37# statement cannot be reached, and remove it. For some reason clang-11 doesn't 38# remove it, resulting in an unresolved reference to qemu_build_not_reached 39# Undefine the __OPTIMIZE__ macro which compiler.h relies on to choose whether 40# to " #define qemu_build_not_reached() g_assert_not_reached() " 41EXTRA_CFLAGS="$CFLAGS -U __OPTIMIZE__" 42 43if ! { [ -e "./COPYING" ] && 44 [ -e "./MAINTAINERS" ] && 45 [ -e "./Makefile" ] && 46 [ -d "./docs" ] && 47 [ -e "./VERSION" ] && 48 [ -d "./linux-user" ] && 49 [ -d "./system" ];} ; then 50 fatal "Please run the script from the top of the QEMU tree" 51fi 52 53mkdir -p $OSS_FUZZ_BUILD_DIR || fatal "mkdir $OSS_FUZZ_BUILD_DIR failed" 54cd $OSS_FUZZ_BUILD_DIR || fatal "cd $OSS_FUZZ_BUILD_DIR failed" 55 56 57if [ -z ${OUT+x} ]; then 58 DEST_DIR=$(realpath "./DEST_DIR") 59else 60 DEST_DIR=$OUT 61fi 62 63mkdir -p "$DEST_DIR/lib/" # Copy the shared libraries here 64 65# Build once to get the list of dynamic lib paths, and copy them over 66../configure --disable-werror --cc="$CC" --cxx="$CXX" --enable-fuzzing \ 67 --prefix="/opt/qemu-oss-fuzz" \ 68 --extra-cflags="$EXTRA_CFLAGS" --target-list="i386-softmmu" 69 70if ! make "-j$(nproc)" qemu-fuzz-i386; then 71 fatal "Build failed. Please specify a compiler with fuzzing support"\ 72 "using the \$CC and \$CXX environment variables"\ 73 "\nFor example: CC=clang CXX=clang++ $0" 74fi 75 76if [ "$GITLAB_CI" != "true" ]; then 77 for i in $(ldd ./qemu-fuzz-i386 | cut -f3 -d' '); do 78 cp "$i" "$DEST_DIR/lib/" 79 done 80 rm qemu-fuzz-i386 81 82 # Build a second time to build the final binary with correct rpath 83 ../configure --disable-werror --cc="$CC" --cxx="$CXX" --enable-fuzzing \ 84 --prefix="/opt/qemu-oss-fuzz" \ 85 --extra-cflags="$EXTRA_CFLAGS" --extra-ldflags="-Wl,-rpath,\$ORIGIN/lib" \ 86 --target-list="i386-softmmu" 87 make "-j$(nproc)" qemu-fuzz-i386 V=1 88fi 89 90# Place data files in the preinstall tree 91make install DESTDIR=$DEST_DIR/qemu-bundle 92rm -rf $DEST_DIR/qemu-bundle/opt/qemu-oss-fuzz/bin 93rm -rf $DEST_DIR/qemu-bundle/opt/qemu-oss-fuzz/libexec 94 95export ASAN_OPTIONS=detect_leaks=0 96targets=$(./qemu-fuzz-i386 | grep generic-fuzz | awk '$1 ~ /\*/ {print $2}') 97base_copy="$DEST_DIR/qemu-fuzz-i386-target-$(echo "$targets" | head -n 1)" 98 99cp "./qemu-fuzz-i386" "$base_copy" 100 101# Run the fuzzer with no arguments, to print the help-string and get the list 102# of available fuzz-targets. Copy over the qemu-fuzz-i386, naming it according 103# to each available fuzz target (See 05509c8e6d fuzz: select fuzz target using 104# executable name) 105for target in $(echo "$targets" | tail -n +2); 106do 107 # Ignore the generic-fuzz target, as it requires some environment variables 108 # to be configured. We have some generic-fuzz-{pc-q35, floppy, ...} targets 109 # that are thin wrappers around this target that set the required 110 # environment variables according to predefined configs. 111 if [[ $target == "generic-fuzz-"* ]]; then 112 ln $base_copy \ 113 "$DEST_DIR/qemu-fuzz-i386-target-$target" 114 fi 115done 116 117echo "Done. The fuzzers are located in $DEST_DIR" 118exit 0 119