76 lines
3.2 KiB
Bash
Executable File
76 lines
3.2 KiB
Bash
Executable File
#!/bin/bash -eu
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# Copyright 2018 Google Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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################################################################################
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# "Build the project" is a no-op. There is no "./configure.sh && make" dance.
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# Wuffs' generated C files are "drop-in libraries" a la
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# http://gpfault.net/posts/drop-in-libraries.txt.html
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for f in fuzz/c/std/*_fuzzer.c*; do
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# Extract the format name (such as "gzip", from the C or C++ file name,
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# "fuzz/c/std/gzip_fuzzer.c") and make the "gzip_fuzzer" binary. First
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# compile the (C or C++) Wuffs code...
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extension="${f##*.}"
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if [ "$extension" = "c" ]; then
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echo "Building (C) $f"
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b=$(basename $f _fuzzer.c)
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$CC $CFLAGS -c $f -o $WORK/${b}_fuzzer.o
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elif [ "$extension" = "cc" ]; then
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if [[ $LIB_FUZZING_ENGINE == *"DataFlow"* ]]; then
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# Linking (below) with "--engine dataflow" works with the C fuzzers but
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# not the C++ ones. With C++, we get errors like `undefined reference to
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# `dfs$_ZNSt3__112basic_stringIcNS_11char_traitsIcEENS_9allocatorIcEEED2Ev'`
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#
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# This is possibly "DFsan instrumented dependencies"
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# https://github.com/google/oss-fuzz/issues/3388
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echo "Skipping (C++) $f"
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continue
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fi
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echo "Building (C++) $f"
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b=$(basename $f _fuzzer.cc)
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$CXX $CXXFLAGS -c $f -o $WORK/${b}_fuzzer.o
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else
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continue
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fi
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# ...then link the (C++) fuzzing library.
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$CXX $CXXFLAGS $WORK/${b}_fuzzer.o -o $OUT/${b}_fuzzer $LIB_FUZZING_ENGINE
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# Make the optional "gzip_fuzzer_seed_corpus.zip" archive. This means
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# extracting the "foo/bar/*.gz" out of the matching "gzip: foo/bar/*.gz"
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# lines in fuzz/c/std/seed_corpora.txt.
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#
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# The seed_corpora.txt lines can contain multiple entries, combining
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# independent corpora. A naive "zip --junk-paths" of all those files can fail
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# if there are duplicate file names, which can easily happen if the file name
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# is a hash of its contents and the contents are a (trivial) minimal
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# reproducer. We use a de-duplication step of copying all of those files into
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# a single directory. Doing that in a single "cp" or "mv" call can fail with
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# "will not overwrite just-created 'foo/etc' with 'bar/etc'", so we make
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# multiple calls, each copying one file at a time. Later duplicates overwrite
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# earlier duplicates. It's OK if the contents aren't identical. The result is
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# still a valid uber-corpus of seed files.
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seeds=$(sed -n -e "/^$b:/s/^$b: *//p" fuzz/c/std/seed_corpora.txt)
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if [ -n "$seeds" ]; then
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mkdir ${b}_fuzzer_seed_corpus
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for s in $seeds; do
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cp $s ${b}_fuzzer_seed_corpus
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done
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zip --junk-paths --recurse-paths $OUT/${b}_fuzzer_seed_corpus.zip ${b}_fuzzer_seed_corpus
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rm -rf ${b}_fuzzer_seed_corpus
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fi
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done
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