a942f64cc4
Prior to this, fuzzers in the output oss-fuzz directory were exactly the same executable, with a different name to do argv[0]-based fuzz-target selection. This is a waste of space, especially since these binaries can weigh many MB. Instead of copying, use hard links, to cut down on wasted space. We need to place the primary copy of the executable into DEST_DIR, since this is a separate file-system on oss-fuzz. We should not place it directly into $DEST_DIR, since oss-fuzz will treat it as an independent fuzzer and try to run it for fuzzing. Instead, we create a DEST_DIR/bin directory to store the primary copy. Suggested-by: Darren Kenny <darren.kenny@oracle.com> Signed-off-by: Alexander Bulekov <alxndr@bu.edu> Message-Id: <20201023150746.107063-17-alxndr@bu.edu> Reviewed-by: Darren Kenny <darren.kenny@oracle.com> Signed-off-by: Thomas Huth <thuth@redhat.com>
108 lines
3.5 KiB
Bash
Executable file
108 lines
3.5 KiB
Bash
Executable file
#!/bin/sh -e
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#
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# OSS-Fuzz build script. See:
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# https://google.github.io/oss-fuzz/getting-started/new-project-guide/#buildsh
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#
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# The file is consumed by:
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# https://github.com/google/oss-fuzz/blob/master/projects/qemu/Dockerfiles
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#
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# This code is licensed under the GPL version 2 or later. See
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# the COPYING file in the top-level directory.
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#
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# build project
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# e.g.
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# ./autogen.sh
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# ./configure
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# make -j$(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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mkdir -p "$DEST_DIR/bin/" # Copy executables that shouldn't
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# be treated as fuzzers by oss-fuzz here
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# Build once to get the list of dynamic lib paths, and copy them over
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../configure --disable-werror --cc="$CC" --cxx="$CXX" --enable-fuzzing \
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--prefix="$DEST_DIR" --bindir="$DEST_DIR" --datadir="$DEST_DIR/data/" \
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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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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="$CXX" --enable-fuzzing \
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--prefix="$DEST_DIR" --bindir="$DEST_DIR" --datadir="$DEST_DIR/data/" \
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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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# Copy over the datadir
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cp -r ../pc-bios/ "$DEST_DIR/pc-bios"
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cp "./qemu-fuzz-i386" "$DEST_DIR/bin/"
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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 $(./qemu-fuzz-i386 | awk '$1 ~ /\*/ {print $2}');
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do
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ln "$DEST_DIR/bin/qemu-fuzz-i386" \
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"$DEST_DIR/qemu-fuzz-i386-target-$target"
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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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