#!/bin/bash -e # # OSS-Fuzz build script. See: # https://google.github.io/oss-fuzz/getting-started/new-project-guide/#buildsh # # The file is consumed by: # https://github.com/google/oss-fuzz/blob/master/projects/qemu/Dockerfiles # # This code is licensed under the GPL version 2 or later. See # the COPYING file in the top-level directory. # # build project # e.g. # ./autogen.sh # ./configure # make -j$(nproc) all # build fuzzers # e.g. # $CXX $CXXFLAGS -std=c++11 -Iinclude \ # /path/to/name_of_fuzzer.cc -o $OUT/name_of_fuzzer \ # -fsanitize=fuzzer /path/to/library.a fatal () { echo "Error : ${*}, exiting." exit 1 } OSS_FUZZ_BUILD_DIR="./build-oss-fuzz/" # There seems to be a bug in clang-11 (used for builds on oss-fuzz) : # accel/tcg/cputlb.o: In function `load_memop': # accel/tcg/cputlb.c:1505: undefined reference to `qemu_build_not_reached' # # When building with optimization, the compiler is expected to prove that the # statement cannot be reached, and remove it. For some reason clang-11 doesn't # remove it, resulting in an unresolved reference to qemu_build_not_reached # Undefine the __OPTIMIZE__ macro which compiler.h relies on to choose whether # to " #define qemu_build_not_reached() g_assert_not_reached() " EXTRA_CFLAGS="$CFLAGS -U __OPTIMIZE__" if ! { [ -e "./COPYING" ] && [ -e "./MAINTAINERS" ] && [ -e "./Makefile" ] && [ -e "./docs" ] && [ -e "./VERSION" ] && [ -e "./linux-user" ] && [ -e "./softmmu" ];} ; then fatal "Please run the script from the top of the QEMU tree" fi mkdir -p $OSS_FUZZ_BUILD_DIR || fatal "mkdir $OSS_FUZZ_BUILD_DIR failed" cd $OSS_FUZZ_BUILD_DIR || fatal "cd $OSS_FUZZ_BUILD_DIR failed" if [ -z ${OUT+x} ]; then DEST_DIR=$(realpath "./DEST_DIR") else DEST_DIR=$OUT fi mkdir -p "$DEST_DIR/lib/" # Copy the shared libraries here # Build once to get the list of dynamic lib paths, and copy them over ../configure --disable-werror --cc="$CC" --cxx="$CXX" --enable-fuzzing \ --prefix="/opt/qemu-oss-fuzz" \ --extra-cflags="$EXTRA_CFLAGS" --target-list="i386-softmmu" if ! make "-j$(nproc)" qemu-fuzz-i386; then fatal "Build failed. Please specify a compiler with fuzzing support"\ "using the \$CC and \$CXX environment variables"\ "\nFor example: CC=clang CXX=clang++ $0" fi if [ "$GITLAB_CI" != "true" ]; then for i in $(ldd ./qemu-fuzz-i386 | cut -f3 -d' '); do cp "$i" "$DEST_DIR/lib/" done rm qemu-fuzz-i386 # Build a second time to build the final binary with correct rpath ../configure --disable-werror --cc="$CC" --cxx="$CXX" --enable-fuzzing \ --prefix="/opt/qemu-oss-fuzz" \ --extra-cflags="$EXTRA_CFLAGS" --extra-ldflags="-Wl,-rpath,\$ORIGIN/lib" \ --target-list="i386-softmmu" make "-j$(nproc)" qemu-fuzz-i386 V=1 fi # Prepare a preinstalled tree make install DESTDIR=$DEST_DIR/qemu-bundle targets=$(./qemu-fuzz-i386 | awk '$1 ~ /\*/ {print $2}') base_copy="$DEST_DIR/qemu-fuzz-i386-target-$(echo "$targets" | head -n 1)" cp "./qemu-fuzz-i386" "$base_copy" # Run the fuzzer with no arguments, to print the help-string and get the list # of available fuzz-targets. Copy over the qemu-fuzz-i386, naming it according # to each available fuzz target (See 05509c8e6d fuzz: select fuzz target using # executable name) for target in $(echo "$targets" | tail -n +2); do # Ignore the generic-fuzz target, as it requires some environment variables # to be configured. We have some generic-fuzz-{pc-q35, floppy, ...} targets # that are thin wrappers around this target that set the required # environment variables according to predefined configs. if [[ $target == "generic-fuzz-"* ]]; then ln $base_copy \ "$DEST_DIR/qemu-fuzz-i386-target-$target" fi done echo "Done. The fuzzers are located in $DEST_DIR" exit 0