/
fuzz_test.go
370 lines (343 loc) · 9.62 KB
/
fuzz_test.go
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//go:build go1.18
// +build go1.18
package zstd
import (
"bytes"
"fmt"
"go/ast"
"go/parser"
"go/token"
"io"
"io/ioutil"
"os"
rdebug "runtime/debug"
"strconv"
"testing"
"github.com/klauspost/compress/internal/cpuinfo"
"github.com/klauspost/compress/zip"
)
func FuzzDecodeAll(f *testing.F) {
addBytesFromZip(f, "testdata/fuzz/decode-corpus-raw.zip", true)
addBytesFromZip(f, "testdata/fuzz/decode-corpus-encoded.zip", false)
decLow, err := NewReader(nil, WithDecoderLowmem(true), WithDecoderConcurrency(2), WithDecoderMaxMemory(20<<20), WithDecoderMaxWindow(1<<20), IgnoreChecksum(true))
if err != nil {
f.Fatal(err)
}
defer decLow.Close()
decHi, err := NewReader(nil, WithDecoderLowmem(false), WithDecoderConcurrency(2), WithDecoderMaxMemory(20<<20), WithDecoderMaxWindow(1<<20), IgnoreChecksum(true))
if err != nil {
f.Fatal(err)
}
defer decHi.Close()
f.Fuzz(func(t *testing.T, b []byte) {
// Just test if we crash...
defer func() {
if r := recover(); r != nil {
rdebug.PrintStack()
t.Fatal(r)
}
}()
b1, err1 := decLow.DecodeAll(b, nil)
b2, err2 := decHi.DecodeAll(b, nil)
if err1 != err2 {
t.Log(err1, err2)
}
if err1 != nil {
b1, b2 = b1[:0], b2[:0]
}
if !bytes.Equal(b1, b2) {
t.Fatalf("Output mismatch, low: %v, hi: %v", err1, err2)
}
})
}
func FuzzDecodeAllNoBMI2(f *testing.F) {
if !cpuinfo.HasBMI2() {
f.Skip("No BMI, so already tested")
return
}
defer cpuinfo.DisableBMI2()()
FuzzDecodeAll(f)
}
func FuzzDecoder(f *testing.F) {
addBytesFromZip(f, "testdata/fuzz/decode-corpus-raw.zip", true)
addBytesFromZip(f, "testdata/fuzz/decode-corpus-encoded.zip", false)
decLow, err := NewReader(nil, WithDecoderLowmem(true), WithDecoderConcurrency(2), WithDecoderMaxMemory(20<<20), WithDecoderMaxWindow(1<<20), IgnoreChecksum(true))
if err != nil {
f.Fatal(err)
}
defer decLow.Close()
// Test with high memory, but sync decoding
decHi, err := NewReader(nil, WithDecoderLowmem(false), WithDecoderConcurrency(1), WithDecoderMaxMemory(20<<20), WithDecoderMaxWindow(1<<20), IgnoreChecksum(true))
if err != nil {
f.Fatal(err)
}
defer decHi.Close()
f.Fuzz(func(t *testing.T, b []byte) {
// Just test if we crash...
defer func() {
if r := recover(); r != nil {
rdebug.PrintStack()
t.Fatal(r)
}
}()
err := decLow.Reset(io.NopCloser(bytes.NewReader(b)))
if err != nil {
t.Fatal(err)
}
err = decHi.Reset(io.NopCloser(bytes.NewReader(b)))
if err != nil {
t.Fatal(err)
}
b1, err1 := ioutil.ReadAll(decLow)
b2, err2 := ioutil.ReadAll(decHi)
if err1 != err2 {
t.Log(err1, err2)
}
if err1 != nil {
b1, b2 = b1[:0], b2[:0]
}
if !bytes.Equal(b1, b2) {
t.Fatalf("Output mismatch, low: %v, hi: %v", err1, err2)
}
})
}
func FuzzEncoding(f *testing.F) {
addBytesFromZip(f, "testdata/fuzz/encode-corpus-raw.zip", true)
addBytesFromZip(f, "testdata/comp-crashers.zip", true)
addBytesFromZip(f, "testdata/fuzz/encode-corpus-encoded.zip", false)
// Fuzzing tweaks:
const (
// Test a subset of encoders.
startFuzz = SpeedFastest
endFuzz = SpeedBestCompression
// Also tests with dictionaries...
testDicts = true
// Max input size:
maxSize = 1 << 20
)
var dec *Decoder
var encs [SpeedBestCompression + 1]*Encoder
var encsD [SpeedBestCompression + 1]*Encoder
var dicts [][]byte
if testDicts {
zr := testCreateZipReader("testdata/dict-tests-small.zip", f)
dicts = readDicts(f, zr)
}
initEnc := func() func() {
var err error
dec, err = NewReader(nil, WithDecoderConcurrency(2), WithDecoderDicts(dicts...), WithDecoderMaxWindow(128<<10), WithDecoderMaxMemory(maxSize))
if err != nil {
panic(err)
}
for level := startFuzz; level <= endFuzz; level++ {
encs[level], err = NewWriter(nil, WithEncoderCRC(true), WithEncoderLevel(level), WithEncoderConcurrency(2), WithWindowSize(128<<10), WithZeroFrames(true), WithLowerEncoderMem(true))
if testDicts {
encsD[level], err = NewWriter(nil, WithEncoderCRC(true), WithEncoderLevel(level), WithEncoderConcurrency(2), WithWindowSize(128<<10), WithZeroFrames(true), WithEncoderDict(dicts[0]), WithLowerEncoderMem(true), WithLowerEncoderMem(true))
}
}
return func() {
dec.Close()
for _, enc := range encs {
if enc != nil {
enc.Close()
}
}
if testDicts {
for _, enc := range encsD {
if enc != nil {
enc.Close()
}
}
}
}
}
f.Cleanup(initEnc())
var dst bytes.Buffer
f.Fuzz(func(t *testing.T, data []byte) {
// Just test if we crash...
defer func() {
if r := recover(); r != nil {
rdebug.PrintStack()
t.Fatal(r)
}
}()
if len(data) > maxSize {
return
}
var bufSize = len(data)
if bufSize > 2 {
// Make deterministic size
bufSize = int(data[0]) | int(data[1])<<8
if bufSize >= len(data) {
bufSize = len(data) / 2
}
}
for level := startFuzz; level <= endFuzz; level++ {
enc := encs[level]
dst.Reset()
enc.Reset(&dst)
n, err := enc.Write(data)
if err != nil {
t.Fatal(err)
}
if n != len(data) {
t.Fatal(fmt.Sprintln("Level", level, "Short write, got:", n, "want:", len(data)))
}
encoded := enc.EncodeAll(data, make([]byte, 0, bufSize))
got, err := dec.DecodeAll(encoded, make([]byte, 0, bufSize))
if err != nil {
t.Fatal(fmt.Sprintln("Level", level, "DecodeAll error:", err, "\norg:", len(data), "\nencoded", len(encoded)))
}
if !bytes.Equal(got, data) {
t.Fatal(fmt.Sprintln("Level", level, "DecodeAll output mismatch\n", len(got), "org: \n", len(data), "(want)", "\nencoded:", len(encoded)))
}
err = enc.Close()
if err != nil {
t.Fatal(fmt.Sprintln("Level", level, "Close (buffer) error:", err))
}
encoded2 := dst.Bytes()
if !bytes.Equal(encoded, encoded2) {
got, err = dec.DecodeAll(encoded2, got[:0])
if err != nil {
t.Fatal(fmt.Sprintln("Level", level, "DecodeAll (buffer) error:", err, "\norg:", len(data), "\nencoded", len(encoded2)))
}
if !bytes.Equal(got, data) {
t.Fatal(fmt.Sprintln("Level", level, "DecodeAll (buffer) output mismatch\n", len(got), "org: \n", len(data), "(want)", "\nencoded:", len(encoded2)))
}
}
if !testDicts {
continue
}
enc = encsD[level]
dst.Reset()
enc.Reset(&dst)
n, err = enc.Write(data)
if err != nil {
t.Fatal(err)
}
if n != len(data) {
t.Fatal(fmt.Sprintln("Dict Level", level, "Short write, got:", n, "want:", len(data)))
}
encoded = enc.EncodeAll(data, encoded[:0])
got, err = dec.DecodeAll(encoded, got[:0])
if err != nil {
t.Fatal(fmt.Sprintln("Dict Level", level, "DecodeAll error:", err, "\norg:", len(data), "\nencoded", len(encoded)))
}
if !bytes.Equal(got, data) {
t.Fatal(fmt.Sprintln("Dict Level", level, "DecodeAll output mismatch\n", len(got), "org: \n", len(data), "(want)", "\nencoded:", len(encoded)))
}
err = enc.Close()
if err != nil {
t.Fatal(fmt.Sprintln("Dict Level", level, "Close (buffer) error:", err))
}
encoded2 = dst.Bytes()
if !bytes.Equal(encoded, encoded2) {
got, err = dec.DecodeAll(encoded2, got[:0])
if err != nil {
t.Fatal(fmt.Sprintln("Dict Level", level, "DecodeAll (buffer) error:", err, "\norg:", len(data), "\nencoded", len(encoded2)))
}
if !bytes.Equal(got, data) {
t.Fatal(fmt.Sprintln("Dict Level", level, "DecodeAll (buffer) output mismatch\n", len(got), "org: \n", len(data), "(want)", "\nencoded:", len(encoded2)))
}
}
}
})
}
func addBytesFromZip(f *testing.F, filename string, raw bool) {
file, err := os.Open(filename)
if err != nil {
f.Fatal(err)
}
fi, err := file.Stat()
if err != nil {
f.Fatal(err)
}
zr, err := zip.NewReader(file, fi.Size())
if err != nil {
f.Fatal(err)
}
for _, file := range zr.File {
rc, err := file.Open()
if err != nil {
f.Fatal(err)
}
b, err := io.ReadAll(rc)
if err != nil {
f.Fatal(err)
}
rc.Close()
raw := raw
if bytes.HasPrefix(b, []byte("go test fuzz")) {
raw = false
}
if raw {
f.Add(b)
continue
}
vals, err := unmarshalCorpusFile(b)
if err != nil {
f.Fatal(err)
}
for _, v := range vals {
f.Add(v)
}
}
}
// unmarshalCorpusFile decodes corpus bytes into their respective values.
func unmarshalCorpusFile(b []byte) ([][]byte, error) {
if len(b) == 0 {
return nil, fmt.Errorf("cannot unmarshal empty string")
}
lines := bytes.Split(b, []byte("\n"))
if len(lines) < 2 {
return nil, fmt.Errorf("must include version and at least one value")
}
var vals = make([][]byte, 0, len(lines)-1)
for _, line := range lines[1:] {
line = bytes.TrimSpace(line)
if len(line) == 0 {
continue
}
v, err := parseCorpusValue(line)
if err != nil {
return nil, fmt.Errorf("malformed line %q: %v", line, err)
}
vals = append(vals, v)
}
return vals, nil
}
// parseCorpusValue
func parseCorpusValue(line []byte) ([]byte, error) {
fs := token.NewFileSet()
expr, err := parser.ParseExprFrom(fs, "(test)", line, 0)
if err != nil {
return nil, err
}
call, ok := expr.(*ast.CallExpr)
if !ok {
return nil, fmt.Errorf("expected call expression")
}
if len(call.Args) != 1 {
return nil, fmt.Errorf("expected call expression with 1 argument; got %d", len(call.Args))
}
arg := call.Args[0]
if arrayType, ok := call.Fun.(*ast.ArrayType); ok {
if arrayType.Len != nil {
return nil, fmt.Errorf("expected []byte or primitive type")
}
elt, ok := arrayType.Elt.(*ast.Ident)
if !ok || elt.Name != "byte" {
return nil, fmt.Errorf("expected []byte")
}
lit, ok := arg.(*ast.BasicLit)
if !ok || lit.Kind != token.STRING {
return nil, fmt.Errorf("string literal required for type []byte")
}
s, err := strconv.Unquote(lit.Value)
if err != nil {
return nil, err
}
return []byte(s), nil
}
return nil, fmt.Errorf("expected []byte")
}