146 lines
3.4 KiB
Go
146 lines
3.4 KiB
Go
//go:build gofuzz
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/*
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Copyright The containerd Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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package fuzz
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import (
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"archive/tar"
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"bytes"
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"context"
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"io"
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"os"
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"path"
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fuzz "github.com/AdaLogics/go-fuzz-headers"
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"github.com/sirupsen/logrus"
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"github.com/containerd/containerd/archive"
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"github.com/containerd/containerd/content/local"
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imageArchive "github.com/containerd/containerd/images/archive"
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"github.com/containerd/containerd/log"
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ocispec "github.com/opencontainers/image-spec/specs-go/v1"
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)
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// FuzzApply implements a fuzzer that applies
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// a fuzzed tar archive on a directory
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func FuzzApply(data []byte) int {
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ctx := context.Background()
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// Apply() is logging the below message, which is too noisy and not really useful
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// if the input is random.
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//
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// level=warning msg="ignored xattr ... in archive" error="operation not supported"
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log.G(ctx).Logger.SetLevel(logrus.PanicLevel)
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f := fuzz.NewConsumer(data)
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iters, err := f.GetInt()
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if err != nil {
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return 0
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}
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maxIters := 20
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tmpDir, err := os.MkdirTemp("", "prefix-test")
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if err != nil {
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return 0
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}
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defer os.RemoveAll(tmpDir)
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for i := 0; i < iters%maxIters; i++ {
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rBytes, err := f.TarBytes()
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if err != nil {
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return 0
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}
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r := bytes.NewReader(rBytes)
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_, _ = archive.Apply(ctx, tmpDir, r)
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}
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return 1
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}
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// FuzzImportIndex implements a fuzzer
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// that targets archive.ImportIndex()
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func FuzzImportIndex(data []byte) int {
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f := fuzz.NewConsumer(data)
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tarBytes, err := f.TarBytes()
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if err != nil {
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return 0
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}
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var r *bytes.Reader
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ctx := context.Background()
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r = bytes.NewReader(tarBytes)
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shouldRequireLayoutOrManifest, err := f.GetBool()
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if err != nil {
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return 0
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}
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if shouldRequireLayoutOrManifest {
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hasLayoutOrManifest := false
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tr := tar.NewReader(r)
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for {
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hdr, err := tr.Next()
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if err == io.EOF {
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break
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}
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if err != nil {
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return 0
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}
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hdrName := path.Clean(hdr.Name)
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switch hdrName {
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case ocispec.ImageLayoutFile, "manifest.json":
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hasLayoutOrManifest = true
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}
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}
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if !hasLayoutOrManifest {
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var buf bytes.Buffer
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tw := tar.NewWriter(&buf)
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defer tw.Close()
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tr := tar.NewReader(r)
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for {
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hdr, err := tr.Next()
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if err == io.EOF {
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break
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}
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if err != nil {
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return 0
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}
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fileContents, err := io.ReadAll(tr)
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if err != nil {
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return 0
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}
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tw.WriteHeader(hdr)
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tw.Write(fileContents)
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}
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manifestFileContents, err := f.GetBytes()
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if err != nil {
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return 0
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}
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tw.WriteHeader(&tar.Header{
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Name: "manifest.json",
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Mode: 0644,
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Size: int64(len(manifestFileContents)),
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Typeflag: tar.TypeReg,
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})
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tw.Write(manifestFileContents)
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r = bytes.NewReader(buf.Bytes())
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}
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}
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tmpdir, err := os.MkdirTemp("", "fuzzing-")
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if err != nil {
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return 0
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}
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cs, err := local.NewStore(tmpdir)
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if err != nil {
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return 0
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}
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_, _ = imageArchive.ImportIndex(ctx, cs, r)
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return 1
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}
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