1 files changed, 115 insertions, 0 deletions
diff --git a/scripts/oss-fuzz/build.sh b/scripts/oss-fuzz/build.sh
new file mode 100755
index 000000000..98b56e052
--- /dev/null
+++ b/scripts/oss-fuzz/build.sh
@@ -0,0 +1,115 @@
+#!/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 \
+#     -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="$DEST_DIR" --bindir="$DEST_DIR" --datadir="$DEST_DIR/data/" \
+    --extra-cflags="$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="$CXX" --enable-fuzzing \
+        --prefix="$DEST_DIR" --bindir="$DEST_DIR" --datadir="$DEST_DIR/data/" \
+        --extra-cflags="$EXTRA_CFLAGS" --extra-ldflags="-Wl,-rpath,\$ORIGIN/lib" \
+        --target-list="i386-softmmu"
+    make "-j$(nproc)" qemu-fuzz-i386 V=1
+fi
+
+# Copy over the datadir
+cp  -r ../pc-bios/ "$DEST_DIR/pc-bios"
+
+targets=$(./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