diff options
| -rw-r--r-- | MAINTAINERS | 1 | ||||
| -rwxr-xr-x | scripts/oss-fuzz/build.sh | 105 |
2 files changed, 106 insertions, 0 deletions
diff --git a/MAINTAINERS b/MAINTAINERS index a922775e45..9ec50e165d 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2339,6 +2339,7 @@ R: Bandan Das <bsd@redhat.com> R: Stefan Hajnoczi <stefanha@redhat.com> S: Maintained F: tests/qtest/fuzz/ +F: scripts/oss-fuzz/ Register API M: Alistair Francis <alistair@alistair23.me> diff --git a/scripts/oss-fuzz/build.sh b/scripts/oss-fuzz/build.sh new file mode 100755 index 0000000000..f5cee3d67e --- /dev/null +++ b/scripts/oss-fuzz/build.sh @@ -0,0 +1,105 @@ +#!/bin/sh -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 \ +# $LIB_FUZZING_ENGINE /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 ${LIB_FUZZING_ENGINE+x} ]; then + LIB_FUZZING_ENGINE="-fsanitize=fuzzer" +fi + +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" \ + --extra-cflags="$EXTRA_CFLAGS" + +if ! make CONFIG_FUZZ=y CFLAGS="$LIB_FUZZING_ENGINE" "-j$(nproc)" \ + i386-softmmu/fuzz; then + fatal "Build failed. Please specify a compiler with fuzzing support"\ + "using the \$CC and \$CXX environemnt variables, or specify a"\ + "\$LIB_FUZZING_ENGINE compatible with your compiler"\ + "\nFor example: CC=clang CXX=clang++ $0" +fi + +for i in $(ldd ./i386-softmmu/qemu-fuzz-i386 | cut -f3 -d' '); do + cp "$i" "$DEST_DIR/lib/" +done +rm ./i386-softmmu/qemu-fuzz-i386 + +# Build a second time to build the final binary with correct rpath +../configure --bindir="$DEST_DIR" --datadir="$DEST_DIR/data/" --disable-werror \ + --cc="$CC" --cxx="$CXX" --extra-cflags="$EXTRA_CFLAGS" \ + --extra-ldflags="-Wl,-rpath,'\$\$ORIGIN/lib'" +make CONFIG_FUZZ=y CFLAGS="$LIB_FUZZING_ENGINE" "-j$(nproc)" i386-softmmu/fuzz + +# Copy over the datadir +cp -r ../pc-bios/ "$DEST_DIR/pc-bios" + +# 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 $(./i386-softmmu/qemu-fuzz-i386 | awk '$1 ~ /\*/ {print $2}'); +do + cp ./i386-softmmu/qemu-fuzz-i386 "$DEST_DIR/qemu-fuzz-i386-target-$target" +done + +echo "Done. The fuzzers are located in $DEST_DIR" +exit 0 |