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BREAKING feat: use mutation framework for single-byte[] fuzz tests #1034

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BREAKING feat: use mutation framework for single-byte[] fuzz tests #1034

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2 changes: 1 addition & 1 deletion src/main/java/com/code_intelligence/jazzer/driver/FuzzTargetRunner.java
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Original file line number Diff line number Diff line change
Expand Up @@ -137,7 +137,7 @@ public final class FuzzTargetRunner {
useMutatorFramework =
Opt.mutatorFramework.get()
&& Opt.autofuzz.get().isEmpty()
&& !(fuzzTarget.usesPrimitiveByteArray() || fuzzTarget.usesFuzzedDataProvider());
&& !fuzzTarget.usesFuzzedDataProvider();

useFuzzedDataProvider = fuzzTarget.usesFuzzedDataProvider();
if (!useFuzzedDataProvider && IS_ANDROID) {
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9 changes: 8 additions & 1 deletion ...java/com/code_intelligence/jazzer/mutation/mutator/lang/PrimitiveArrayMutatorFactory.java
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Expand Up @@ -73,6 +73,8 @@ public Optional<SerializingMutator<?>> tryCreate(
public static final class PrimitiveArrayMutator<T> extends SerializingMutator<T> {
private static final int DEFAULT_MIN_LENGTH = 0;
private static final int DEFAULT_MAX_LENGTH = 1000;
// This default is chosen to match libFuzzer's default max length for byte arrays.
private static final int DEFAULT_BYTE_ARRAY_MAX_LENGTH = 4096;
private static final Charset FUZZED_DATA_CHARSET = Charset.forName("CESU-8");
private long minRange;
private long maxRange;
Expand Down Expand Up @@ -216,7 +218,12 @@ private void extractRange(AnnotatedType type) {
private void extractLength(AnnotatedType type) {
Optional<WithLength> withLength = Optional.ofNullable(type.getAnnotation(WithLength.class));
minLength = withLength.map(WithLength::min).orElse(DEFAULT_MIN_LENGTH);
maxLength = withLength.map(WithLength::max).orElse(DEFAULT_MAX_LENGTH);
// Different default max lengths for byte[] and other primitive arrays to match libFuzzer.
int defaultMaxLength =
type.getType().getTypeName().equals("byte")
? DEFAULT_BYTE_ARRAY_MAX_LENGTH
: DEFAULT_MAX_LENGTH;
maxLength = withLength.map(WithLength::max).orElse(defaultMaxLength);
}

private AnnotatedType convertWithLength(AnnotatedType type, AnnotatedType newType) {
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