mirror of https://github.com/google/oss-fuzz.git
[libbpf] switch to the upstream repository (#7180)
To make it easier to switch to CFLite eventually the fuzzer and build script were moved upstream. Until CFLite isn't fully integrated there let's just point OSS-Fuzz to the upstream script to mostly let CIFuzz make sure it's buildable.
This commit is contained in:
Evgeny Vereshchagin
GitHub
parent
e0787861af
commit
9decaec30f
|
|
@ -24,4 +24,4 @@ RUN sed -i -e '/^#\s*deb-src.*\smain\s\+restricted/s/^#//' /etc/apt/sources.list
|
|||
apt-get install -y --no-install-recommends libz-dev libz-dev:i386
|
||||
RUN git clone --depth 1 https://github.com/libbpf/libbpf
|
||||
WORKDIR libbpf
|
||||
COPY build.sh *.c *.o $SRC/
|
||||
COPY build.sh $SRC/
|
||||
|
|
|
|||
|
|
@ -1,40 +0,0 @@
|
|||
/*
|
||||
# Copyright 2021 Google Inc.
|
||||
#
|
||||
# Licensed under the Apache License, Version 2.0 (the "License");
|
||||
# you may not use this file except in compliance with the License.
|
||||
# You may obtain a copy of the License at
|
||||
#
|
||||
# http://www.apache.org/licenses/LICENSE-2.0
|
||||
#
|
||||
# Unless required by applicable law or agreed to in writing, software
|
||||
# distributed under the License is distributed on an "AS IS" BASIS,
|
||||
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
# See the License for the specific language governing permissions and
|
||||
# limitations under the License.
|
||||
#
|
||||
################################################################################
|
||||
*/
|
||||
#include "libbpf.h"
|
||||
|
||||
static int libbpf_print_fn(enum libbpf_print_level level, const char *format, va_list args)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
|
||||
struct bpf_object *obj = NULL;
|
||||
DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts);
|
||||
int err;
|
||||
|
||||
libbpf_set_print(libbpf_print_fn);
|
||||
|
||||
opts.object_name = "fuzz-object";
|
||||
obj = bpf_object__open_mem(data, size, &opts);
|
||||
err = libbpf_get_error(obj);
|
||||
if (err)
|
||||
return 0;
|
||||
|
||||
bpf_object__close(obj);
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -14,91 +14,4 @@
|
|||
# limitations under the License.
|
||||
#
|
||||
################################################################################
|
||||
|
||||
# This script is supposed to be compatible with OSS-Fuzz, i.e. it has to use
|
||||
# environment variables like $CC, $CFLAGS, $OUT, link the fuzz targets with CXX
|
||||
# (even though the project is written in C) and so on:
|
||||
# https://google.github.io/oss-fuzz/getting-started/new-project-guide/#buildsh
|
||||
|
||||
# It can be used to build and run the fuzz targets using Docker and the images
|
||||
# provided by the OSS-Fuzz project: https://google.github.io/oss-fuzz/advanced-topics/reproducing/#building-using-docker
|
||||
|
||||
# It can also be used to build and run the fuzz target locally without Docker.
|
||||
# After installing clang and the build dependencies of libelf by running something
|
||||
# like `dnf build-dep elfutils-devel` on Fedora or `apt-get build-dep libelf-dev`
|
||||
# on Debian/Ubuntu, the following commands should be run:
|
||||
#
|
||||
# $ git clone https://github.com/google/oss-fuzz
|
||||
# $ cd oss-fuzz/projects/libbpf
|
||||
# $ git clone https://github.com/libbpf/libbpf
|
||||
# $ ./build.sh
|
||||
# $ unzip -d CORPUS ./out/bpf-object-fuzzer_seed_corpus.zip
|
||||
# $ ./out/bpf-object-fuzzer CORPUS
|
||||
|
||||
|
||||
set -eux
|
||||
|
||||
SANITIZER=${SANITIZER:-address}
|
||||
flags="-O1 -fno-omit-frame-pointer -gline-tables-only -DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION -fsanitize=$SANITIZER -fsanitize=fuzzer-no-link"
|
||||
|
||||
export CC=${CC:-clang}
|
||||
export CFLAGS=${CFLAGS:-$flags}
|
||||
|
||||
export CXX=${CXX:-clang++}
|
||||
export CXXFLAGS=${CXXFLAGS:-$flags}
|
||||
|
||||
export SRC=${SRC:-$(realpath -- $(dirname -- "$0"))}
|
||||
cd "$SRC/libbpf"
|
||||
|
||||
export OUT=${OUT:-"$SRC/out"}
|
||||
mkdir -p "$OUT"
|
||||
|
||||
export LIB_FUZZING_ENGINE=${LIB_FUZZING_ENGINE:--fsanitize=fuzzer}
|
||||
|
||||
# Ideally libbelf should be built using release tarballs available
|
||||
# at https://sourceware.org/elfutils/ftp/. Unfortunately sometimes they
|
||||
# fail to compile (for example, elfutils-0.185 fails to compile with LDFLAGS enabled
|
||||
# due to https://bugs.gentoo.org/794601) so let's just point the script to
|
||||
# commits referring to versions of libelf that actually can be built
|
||||
rm -rf elfutils
|
||||
git clone git://sourceware.org/git/elfutils.git
|
||||
(
|
||||
cd elfutils
|
||||
git checkout 983e86fd89e8bf02f2d27ba5dce5bf078af4ceda
|
||||
git log --oneline -1
|
||||
|
||||
# ASan isn't compatible with -Wl,--no-undefined: https://github.com/google/sanitizers/issues/380
|
||||
find -name Makefile.am | xargs sed -i 's/,--no-undefined//'
|
||||
|
||||
# ASan isn't compatible with -Wl,-z,defs either:
|
||||
# https://clang.llvm.org/docs/AddressSanitizer.html#usage
|
||||
sed -i 's/^\(ZDEFS_LDFLAGS=\).*/\1/' configure.ac
|
||||
|
||||
|
||||
autoreconf -i -f
|
||||
if ! ./configure --enable-maintainer-mode --disable-debuginfod --disable-libdebuginfod \
|
||||
CC="$CC" CFLAGS="-Wno-error $CFLAGS" CXX="$CXX" CXXFLAGS="-Wno-error $CXXFLAGS" LDFLAGS="$CFLAGS"; then
|
||||
cat config.log
|
||||
exit 1
|
||||
fi
|
||||
|
||||
make -C config -j$(nproc) V=1
|
||||
make -C lib -j$(nproc) V=1
|
||||
make -C libelf -j$(nproc) V=1
|
||||
)
|
||||
|
||||
make -C src BUILD_STATIC_ONLY=y V=1 clean
|
||||
make -C src -j$(nproc) CFLAGS="-I$(pwd)/elfutils/libelf $CFLAGS" BUILD_STATIC_ONLY=y V=1
|
||||
|
||||
$CC $CFLAGS -Isrc -Iinclude -Iinclude/uapi -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -c "$SRC/bpf-object-fuzzer.c" -o bpf-object-fuzzer.o
|
||||
$CXX $CXXFLAGS $LIB_FUZZING_ENGINE bpf-object-fuzzer.o src/libbpf.a "$(pwd)/elfutils/libelf/libelf.a" -l:libz.a -o "$OUT/bpf-object-fuzzer"
|
||||
|
||||
# minimal.bpf.o was borrowed from https://github.com/libbpf/libbpf-bootstrap
|
||||
# and was generated with
|
||||
# $ clang -g -O2 -target bpf -D__TARGET_ARCH_x86 -I.output -I../../libbpf/include/uapi \
|
||||
# -I../../vmlinux/ -idirafter /usr/local/include -idirafter /usr/lib64/clang/11.0.0/include \
|
||||
# -idirafter /usr/include -c minimal.bpf.c -o .output/minimal.bpf.o
|
||||
# $ llvm-strip -g .output/minimal.bpf.o
|
||||
# In theory it's possible to generate it on the fly so as not to keep it in the repository
|
||||
# but clang on OSS-Fuzz doesn't support -target bpf
|
||||
zip -j "$OUT/bpf-object-fuzzer_seed_corpus.zip" "$SRC/minimal.bpf.o"
|
||||
./scripts/build-fuzzers.sh
|
||||
|
|
|
|||
Binary file not shown.
Loading…
Reference in New Issue