golang: add fuzzers (#8228)

Signed-off-by: AdamKorcz <adam@adalogics.com>

Signed-off-by: AdamKorcz <adam@adalogics.com>

projects/golang/Dockerfile

@@ -17,6 +17,11 @@
 FROM gcr.io/oss-fuzz-base/base-builder-go
 
 RUN git clone --depth 1 https://github.com/dvyukov/go-fuzz-corpus golang
-COPY build.sh text_fuzzer.go math_big_fuzzer.go $SRC/
+RUN git clone --depth 1 https://github.com/golang/go
+COPY build.sh text_fuzzer.go \
+     math_big_fuzzer.go \
+     fuzz_tar_reader.go \
+     fuzz_tar_reader.options \
+     elf_fuzzer.go $SRC/
 
 WORKDIR $SRC/golang

projects/golang/build.sh

@@ -46,3 +46,28 @@ compile_go_fuzzer $FUZZ_ROOT/time Fuzz time_fuzzer
 compile_go_fuzzer $FUZZ_ROOT/xml Fuzz xml_fuzzer
 compile_go_fuzzer $FUZZ_ROOT/zip Fuzz zip_fuzzer
 compile_go_fuzzer $FUZZ_ROOT/zlib Fuzz zlib_fuzzer
+
+cd $SRC && git clone https://github.com/AdamKorcz/instrumentation
+cd instrumentation
+go run main.go $SRC/go/src/archive/tar
+
+cd $SRC/go/src/archive/tar
+cp $SRC/fuzz_tar_reader.go ./
+go mod init tarPackage
+rm ./*_test.go
+
+compile_go_fuzzer tarPackage FuzzTarReader fuzz_tar_reader
+
+cd $SRC/go/src/internal/saferio
+go mod init saferioPackage
+go mod tidy
+
+cd $SRC/go/src/debug/elf
+go mod init elfPackage
+go mod tidy
+go mod edit -replace internal/saferio=../../internal/saferio
+go get internal/saferio
+cp $SRC/elf_fuzzer.go ./
+rm ./*_test.go
+compile_go_fuzzer elfPackage FuzzElfOpen fuzz_elf_open
+zip $OUT/fuzz_elf_open_seed_corpus.zip ./testdata/*

projects/golang/elf_fuzzer.go

@@ -0,0 +1,40 @@
+// Copyright 2022 Google LLC
+//
+// 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.
+//
+
+package elf
+
+import (
+	"os"
+)
+
+func FuzzElfOpen(data []byte) int {
+	defer os.Remove("tmpFile")
+	f, err := os.Create("tmpFile")
+	if err != nil {
+		return 0
+	}
+	defer f.Close()
+	_, err = f.Write(data)
+	if err != nil {
+		return 0
+	}
+
+	_, err = Open("tmpFile")
+	if err != nil {
+		return 0
+	}
+
+	return 1
+}

projects/golang/fuzz_tar_reader.go

@@ -0,0 +1,36 @@
+// Copyright 2022 Google LLC
+//
+// 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.
+//
+
+package tar
+
+import (
+	"bytes"
+	"io"
+)
+
+func FuzzTarReader(data []byte) int {
+	r := bytes.NewReader(data)
+	tarReader := NewReader(r)
+	for {
+		_, err := tarReader.Next()
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			return 0
+		}
+	}
+	return 1
+}

projects/golang/fuzz_tar_reader.options

@@ -0,0 +1,3 @@
+[libfuzzer]
+max_len = 1500000
+len_control = 0