mirror of
https://github.com/netdata/libbpf.git
synced 2026-03-19 15:59:06 +08:00
1596a09b5d
to make it less likely for the libbpf fuzz target to run into elfutils bugs that have been fixed upstream since two new fuzz targets were added there back in April. Signed-off-by: Evgeny Vereshchagin <evvers@ya.ru>
82 lines
3.0 KiB
Bash
Executable File
82 lines
3.0 KiB
Bash
Executable File
#!/bin/bash
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set -eux
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SANITIZER=${SANITIZER:-address}
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flags="-O1 -fno-omit-frame-pointer -g -DFUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION -fsanitize=$SANITIZER -fsanitize=fuzzer-no-link"
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export CC=${CC:-clang}
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export CFLAGS=${CFLAGS:-$flags}
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export CXX=${CXX:-clang++}
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export CXXFLAGS=${CXXFLAGS:-$flags}
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cd "$(dirname -- "$0")/.."
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export OUT=${OUT:-"$(pwd)/out"}
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mkdir -p "$OUT"
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export LIB_FUZZING_ENGINE=${LIB_FUZZING_ENGINE:--fsanitize=fuzzer}
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# libelf is compiled with _FORTIFY_SOURCE by default and it
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# isn't compatible with MSan. It was borrowed
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# from https://github.com/google/oss-fuzz/pull/7422
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if [[ "$SANITIZER" == memory ]]; then
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CFLAGS+=" -U_FORTIFY_SOURCE"
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CXXFLAGS+=" -U_FORTIFY_SOURCE"
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fi
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# The alignment check is turned off by default on OSS-Fuzz/CFLite so it should be
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# turned on explicitly there. It was borrowed from
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# https://github.com/google/oss-fuzz/pull/7092
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if [[ "$SANITIZER" == undefined ]]; then
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additional_ubsan_checks=alignment
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UBSAN_FLAGS="-fsanitize=$additional_ubsan_checks -fno-sanitize-recover=$additional_ubsan_checks"
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CFLAGS+=" $UBSAN_FLAGS"
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CXXFLAGS+=" $UBSAN_FLAGS"
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fi
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# Ideally libbelf should be built using release tarballs available
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# at https://sourceware.org/elfutils/ftp/. Unfortunately sometimes they
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# fail to compile (for example, elfutils-0.185 fails to compile with LDFLAGS enabled
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# due to https://bugs.gentoo.org/794601) so let's just point the script to
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# commits referring to versions of libelf that actually can be built
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rm -rf elfutils
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git clone git://sourceware.org/git/elfutils.git
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(
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cd elfutils
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git checkout e9f3045caa5c4498f371383e5519151942d48b6d
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git log --oneline -1
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# ASan isn't compatible with -Wl,--no-undefined: https://github.com/google/sanitizers/issues/380
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find -name Makefile.am | xargs sed -i 's/,--no-undefined//'
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# ASan isn't compatible with -Wl,-z,defs either:
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# https://clang.llvm.org/docs/AddressSanitizer.html#usage
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sed -i 's/^\(ZDEFS_LDFLAGS=\).*/\1/' configure.ac
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if [[ "$SANITIZER" == undefined ]]; then
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# That's basicaly what --enable-sanitize-undefined does to turn off unaligned access
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# elfutils heavily relies on on i386/x86_64 but without changing compiler flags along the way
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sed -i 's/\(check_undefined_val\)=[0-9]/\1=1/' configure.ac
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fi
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autoreconf -i -f
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if ! ./configure --enable-maintainer-mode --disable-debuginfod --disable-libdebuginfod \
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CC="$CC" CFLAGS="-Wno-error $CFLAGS" CXX="$CXX" CXXFLAGS="-Wno-error $CXXFLAGS" LDFLAGS="$CFLAGS"; then
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cat config.log
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exit 1
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fi
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make -C config -j$(nproc) V=1
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make -C lib -j$(nproc) V=1
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make -C libelf -j$(nproc) V=1
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)
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make -C src BUILD_STATIC_ONLY=y V=1 clean
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make -C src -j$(nproc) CFLAGS="-I$(pwd)/elfutils/libelf $CFLAGS" BUILD_STATIC_ONLY=y V=1
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$CC $CFLAGS -Isrc -Iinclude -Iinclude/uapi -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -c fuzz/bpf-object-fuzzer.c -o bpf-object-fuzzer.o
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$CXX $CXXFLAGS $LIB_FUZZING_ENGINE bpf-object-fuzzer.o src/libbpf.a "$(pwd)/elfutils/libelf/libelf.a" -l:libz.a -o "$OUT/bpf-object-fuzzer"
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cp fuzz/bpf-object-fuzzer_seed_corpus.zip "$OUT"
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