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https://github.com/xemu-project/xemu.git
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7906f11e62
Depending on how the target list is sorted in by qemu, the first target (used as the base copy of the fuzzer, to which all others are linked) might not be a generic-fuzzer. Since we are trying to only use generic-fuzz, on oss-fuzz, fix that, to ensure the base copy is a generic-fuzzer. Signed-off-by: Alexander Bulekov <alxndr@bu.edu> Message-Id: <20220720180946.2264253-1-alxndr@bu.edu> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
118 lines
3.9 KiB
Bash
Executable file
118 lines
3.9 KiB
Bash
Executable file
#!/bin/bash -e
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#
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# OSS-Fuzz build script. See:
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# https://google.github.io/oss-fuzz/getting-started/new-project-guide/#buildsh
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#
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# The file is consumed by:
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# https://github.com/google/oss-fuzz/blob/master/projects/qemu/Dockerfiles
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#
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# This code is licensed under the GPL version 2 or later. See
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# the COPYING file in the top-level directory.
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#
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# build project
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# e.g.
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# ./autogen.sh
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# ./configure
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# make -j$(nproc) all
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# build fuzzers
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# e.g.
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# $CXX $CXXFLAGS -std=c++11 -Iinclude \
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# /path/to/name_of_fuzzer.cc -o $OUT/name_of_fuzzer \
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# -fsanitize=fuzzer /path/to/library.a
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fatal () {
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echo "Error : ${*}, exiting."
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exit 1
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}
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OSS_FUZZ_BUILD_DIR="./build-oss-fuzz/"
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# There seems to be a bug in clang-11 (used for builds on oss-fuzz) :
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# accel/tcg/cputlb.o: In function `load_memop':
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# accel/tcg/cputlb.c:1505: undefined reference to `qemu_build_not_reached'
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#
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# When building with optimization, the compiler is expected to prove that the
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# statement cannot be reached, and remove it. For some reason clang-11 doesn't
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# remove it, resulting in an unresolved reference to qemu_build_not_reached
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# Undefine the __OPTIMIZE__ macro which compiler.h relies on to choose whether
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# to " #define qemu_build_not_reached() g_assert_not_reached() "
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EXTRA_CFLAGS="$CFLAGS -U __OPTIMIZE__"
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if ! { [ -e "./COPYING" ] &&
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[ -e "./MAINTAINERS" ] &&
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[ -e "./Makefile" ] &&
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[ -e "./docs" ] &&
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[ -e "./VERSION" ] &&
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[ -e "./linux-user" ] &&
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[ -e "./softmmu" ];} ; then
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fatal "Please run the script from the top of the QEMU tree"
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fi
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mkdir -p $OSS_FUZZ_BUILD_DIR || fatal "mkdir $OSS_FUZZ_BUILD_DIR failed"
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cd $OSS_FUZZ_BUILD_DIR || fatal "cd $OSS_FUZZ_BUILD_DIR failed"
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if [ -z ${OUT+x} ]; then
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DEST_DIR=$(realpath "./DEST_DIR")
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else
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DEST_DIR=$OUT
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fi
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mkdir -p "$DEST_DIR/lib/" # Copy the shared libraries here
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# Build once to get the list of dynamic lib paths, and copy them over
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../configure --disable-werror --cc="$CC" --cxx="$CXX" --enable-fuzzing \
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--prefix="/opt/qemu-oss-fuzz" \
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--extra-cflags="$EXTRA_CFLAGS" --target-list="i386-softmmu"
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if ! make "-j$(nproc)" qemu-fuzz-i386; then
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fatal "Build failed. Please specify a compiler with fuzzing support"\
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"using the \$CC and \$CXX environment variables"\
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"\nFor example: CC=clang CXX=clang++ $0"
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fi
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if [ "$GITLAB_CI" != "true" ]; then
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for i in $(ldd ./qemu-fuzz-i386 | cut -f3 -d' '); do
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cp "$i" "$DEST_DIR/lib/"
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done
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rm qemu-fuzz-i386
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# Build a second time to build the final binary with correct rpath
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../configure --disable-werror --cc="$CC" --cxx="$CXX" --enable-fuzzing \
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--prefix="/opt/qemu-oss-fuzz" \
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--extra-cflags="$EXTRA_CFLAGS" --extra-ldflags="-Wl,-rpath,\$ORIGIN/lib" \
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--target-list="i386-softmmu"
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make "-j$(nproc)" qemu-fuzz-i386 V=1
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fi
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# Place data files in the preinstall tree
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make install DESTDIR=$DEST_DIR/qemu-bundle
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rm -rf $DEST_DIR/qemu-bundle/opt/qemu-oss-fuzz/bin
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rm -rf $DEST_DIR/qemu-bundle/opt/qemu-oss-fuzz/libexec
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targets=$(./qemu-fuzz-i386 | grep generic-fuzz | awk '$1 ~ /\*/ {print $2}')
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base_copy="$DEST_DIR/qemu-fuzz-i386-target-$(echo "$targets" | head -n 1)"
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cp "./qemu-fuzz-i386" "$base_copy"
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# Run the fuzzer with no arguments, to print the help-string and get the list
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# of available fuzz-targets. Copy over the qemu-fuzz-i386, naming it according
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# to each available fuzz target (See 05509c8e6d fuzz: select fuzz target using
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# executable name)
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for target in $(echo "$targets" | tail -n +2);
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do
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# Ignore the generic-fuzz target, as it requires some environment variables
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# to be configured. We have some generic-fuzz-{pc-q35, floppy, ...} targets
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# that are thin wrappers around this target that set the required
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# environment variables according to predefined configs.
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if [[ $target == "generic-fuzz-"* ]]; then
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ln $base_copy \
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"$DEST_DIR/qemu-fuzz-i386-target-$target"
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fi
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done
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echo "Done. The fuzzers are located in $DEST_DIR"
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exit 0
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