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types/alpine: add fuzzer #1200
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,35 @@ | ||
| // | ||
| // Copyright 2022 The Sigstore Authors. | ||
| // | ||
| // 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 alpine | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "testing" | ||
|
|
||
| fuzz "github.com/AdaLogics/go-fuzz-headers" | ||
| ) | ||
|
|
||
| func FuzzPackageUnmarshal(f *testing.F) { | ||
| f.Fuzz(func(t *testing.T, data []byte) { | ||
| ff := fuzz.NewConsumer(data) | ||
| tarBytes, err := ff.TarBytes() | ||
| if err != nil { | ||
| return | ||
| } | ||
| p := &Package{} | ||
| p.Unmarshal(bytes.NewReader(tarBytes)) | ||
| }) | ||
| } | ||
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Unmarshal assumes a concatenation of 3 tar.gz files with some headers removed... so is just
TarBytes()the correct input to be passing?rekor/pkg/types/alpine/apk.go
Line 107 in 21e5b63
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Good point. I would say it is good enough to get started since the fuzzer does not do any assertions to assess whether the function behaves correctly. I tested this locally, and it does get into the file readings of the tar archives which is great.
Wrt to leaving out the footers, I will add that as an option in
go-fuzz-headers.I plan to iterate over the fuzzer based on the feedback from OSS-Fuzz. If we get a lot of false crashes, then we can modify.