1#!/bin/sh -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 [ -e "./docs" ] && 47 [ -e "./VERSION" ] && 48 [ -e "./linux-user" ] && 49 [ -e "./softmmu" ];} ; 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="$DEST_DIR" --bindir="$DEST_DIR" --datadir="$DEST_DIR/data/" \ 68 --extra-cflags="$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 76for i in $(ldd ./qemu-fuzz-i386 | cut -f3 -d' '); do 77 cp "$i" "$DEST_DIR/lib/" 78done 79rm qemu-fuzz-i386 80 81# Build a second time to build the final binary with correct rpath 82../configure --disable-werror --cc="$CC" --cxx="$CXX" --enable-fuzzing \ 83 --prefix="$DEST_DIR" --bindir="$DEST_DIR" --datadir="$DEST_DIR/data/" \ 84 --extra-cflags="$EXTRA_CFLAGS" --extra-ldflags="-Wl,-rpath,\$ORIGIN/lib" \ 85 --target-list="i386-softmmu" 86make "-j$(nproc)" qemu-fuzz-i386 V=1 87 88# Copy over the datadir 89cp -r ../pc-bios/ "$DEST_DIR/pc-bios" 90 91targets=$(./qemu-fuzz-i386 | awk '$1 ~ /\*/ {print $2}') 92base_copy="$DEST_DIR/qemu-fuzz-i386-target-$(echo "$targets" | head -n 1)" 93 94cp "./qemu-fuzz-i386" "$base_copy" 95 96# Run the fuzzer with no arguments, to print the help-string and get the list 97# of available fuzz-targets. Copy over the qemu-fuzz-i386, naming it according 98# to each available fuzz target (See 05509c8e6d fuzz: select fuzz target using 99# executable name) 100for target in $(echo "$targets" | tail -n +2); 101do 102 # Ignore the generic-fuzz target, as it requires some environment variables 103 # to be configured. We have some generic-fuzz-{pc-q35, floppy, ...} targets 104 # that are thin wrappers around this target that set the required 105 # environment variables according to predefined configs. 106 if [ "$target" != "generic-fuzz" ]; then 107 ln $base_copy \ 108 "$DEST_DIR/qemu-fuzz-i386-target-$target" 109 fi 110done 111 112echo "Done. The fuzzers are located in $DEST_DIR" 113exit 0 114