mirror of https://github.com/google/oss-fuzz.git
95 lines
3.3 KiB
Bash
Executable File
95 lines
3.3 KiB
Bash
Executable File
#!/bin/bash -eu
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# Copyright 2022 Google LLC
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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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# Rewrites a copy of the fuzzer to allow for
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# libFuzzer instrumentation.
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function rewrite_go_fuzz_harness() {
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fuzzer_filename=$1
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fuzz_function=$2
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# Create a copy of the fuzzer to not modify the existing fuzzer.
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cp $fuzzer_filename "${fuzzer_filename}"_fuzz_.go
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mv $fuzzer_filename /tmp/
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fuzzer_fn="${fuzzer_filename}"_fuzz_.go
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# Replace *testing.F with *go118fuzzbuildutils.F.
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echo "replacing *testing.F"
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sed -i "s/func $fuzz_function(\([a-zA-Z0-9]*\) \*testing\.F)/func $fuzz_function(\1 \*go118fuzzbuildutils\.F)/g" "${fuzzer_fn}"
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# Import https://github.com/AdamKorcz/go-118-fuzz-build.
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# This changes the line numbers from the original fuzzer.
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addimport -path "${fuzzer_fn}"
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}
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function build_native_go_fuzzer() {
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fuzzer=$1
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function=$2
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path=$3
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tags="-tags gofuzz"
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if [[ $SANITIZER = *coverage* ]]; then
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echo "here we perform coverage build"
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fuzzed_package=`go list $tags -f '{{.Name}}' $path`
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abspath=`go list $tags -f {{.Dir}} $path`
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cd $abspath
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cp $GOPATH/native_ossfuzz_coverage_runner.go ./"${function,,}"_test.go
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sed -i -e 's/FuzzFunction/'$function'/' ./"${function,,}"_test.go
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sed -i -e 's/mypackagebeingfuzzed/'$fuzzed_package'/' ./"${function,,}"_test.go
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sed -i -e 's/TestFuzzCorpus/Test'$function'Corpus/' ./"${function,,}"_test.go
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# The repo is the module path/name, which is already created above
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# in case it doesn't exist, but not always the same as the module
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# path. This is necessary to handle SIV properly.
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fuzzed_repo=$(go list $tags -f {{.Module}} "$path")
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abspath_repo=`go list -m $tags -f {{.Dir}} $fuzzed_repo || go list $tags -f {{.Dir}} $fuzzed_repo`
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# give equivalence to absolute paths in another file, as go test -cover uses golangish pkg.Dir
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echo "s=$fuzzed_repo"="$abspath_repo"= > $OUT/$fuzzer.gocovpath
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go test -run Test${function}Corpus -v $tags -coverpkg $fuzzed_repo/... -c -o $OUT/$fuzzer $path
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rm ./"${function,,}"_test.go
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else
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go-118-fuzz-build -o $fuzzer.a -func $function $abs_file_dir
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$CXX $CXXFLAGS $LIB_FUZZING_ENGINE $fuzzer.a -o $OUT/$fuzzer
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fi
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}
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path=$1
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function=$2
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fuzzer=$3
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tags="-tags gofuzz"
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# Get absolute path.
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abs_file_dir=$(go list $tags -f {{.Dir}} $path)
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# TODO(adamkorcz): Get rid of "-r" flag here.
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fuzzer_filename=$(grep -r -l -s "$function" "${abs_file_dir}")
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# Test if file contains a line with "func $function" and "testing.F".
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if [ $(grep -r "func $function" $fuzzer_filename | grep "testing.F" | wc -l) -eq 1 ]
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then
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rewrite_go_fuzz_harness $fuzzer_filename $function
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build_native_go_fuzzer $fuzzer $function $abs_file_dir
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# Clean up.
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rm "${fuzzer_filename}_fuzz_.go"
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mv /tmp/$(basename $fuzzer_filename) $fuzzer_filename
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else
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echo "Could not find the function: func ${function}(f *testing.F)"
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fi
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