jcs.org
qemu with hax to log dma reads & writes
jcs.org/2018/11/12/vfio
fuzz: add oss-fuzz build-script
It is neater to keep this in the QEMU repo, since any change that
requires an update to the oss-fuzz build configuration, can make the
necessary changes in the same series.
Suggested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Message-Id: <20200612055145.12101-1-alxndr@bu.edu>
Signed-off-by: Thomas Huth <thuth@redhat.com>
authored by
Alexander Bulekov
and committed by
Thomas Huth
211635b3
8efebd4e
+106
+1
MAINTAINERS
+1
MAINTAINERS
+105
scripts/oss-fuzz/build.sh
+105
scripts/oss-fuzz/build.sh
···
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#!/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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# $LIB_FUZZING_ENGINE /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 ${LIB_FUZZING_ENGINE+x} ]; then
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LIB_FUZZING_ENGINE="-fsanitize=fuzzer"
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fi
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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" \
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--extra-cflags="$EXTRA_CFLAGS"
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if ! make CONFIG_FUZZ=y CFLAGS="$LIB_FUZZING_ENGINE" "-j$(nproc)" \
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i386-softmmu/fuzz; then
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fatal "Build failed. Please specify a compiler with fuzzing support"\
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"using the \$CC and \$CXX environemnt variables, or specify a"\
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"\$LIB_FUZZING_ENGINE compatible with your compiler"\
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"\nFor example: CC=clang CXX=clang++ $0"
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fi
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for i in $(ldd ./i386-softmmu/qemu-fuzz-i386 | cut -f3 -d' '); do
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cp "$i" "$DEST_DIR/lib/"
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done
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rm ./i386-softmmu/qemu-fuzz-i386
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# Build a second time to build the final binary with correct rpath
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../configure --bindir="$DEST_DIR" --datadir="$DEST_DIR/data/" --disable-werror \
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--cc="$CC" --cxx="$CXX" --extra-cflags="$EXTRA_CFLAGS" \
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--extra-ldflags="-Wl,-rpath,'\$\$ORIGIN/lib'"
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make CONFIG_FUZZ=y CFLAGS="$LIB_FUZZING_ENGINE" "-j$(nproc)" i386-softmmu/fuzz
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# Copy over the datadir
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cp -r ../pc-bios/ "$DEST_DIR/pc-bios"
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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 $(./i386-softmmu/qemu-fuzz-i386 | awk '$1 ~ /\*/ {print $2}');
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do
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cp ./i386-softmmu/qemu-fuzz-i386 "$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