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junit: Generate temporary seeds with deterministic names #744

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Jun 19, 2023
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junit: Generate temporary seeds with deterministic names #744

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21 changes: 19 additions & 2 deletions src/main/java/com/code_intelligence/jazzer/junit/FuzzTestExecutor.java
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Original file line number Diff line number Diff line change
Expand Up @@ -33,7 +33,11 @@
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
import java.util.Base64;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
Expand Down Expand Up @@ -212,8 +216,21 @@ static FuzzTestExecutor fromContext(ExtensionContext extensionContext) {
}

public void addSeed(byte[] bytes) throws IOException {
Path seed = Files.createTempFile(javaSeedsDir, "seed", null);
Files.write(seed, bytes);
Path tmpSeed = Files.createTempFile(javaSeedsDir, "tmp-seed-", null);
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Files.write(tmpSeed, bytes);

byte[] hash;
try {
hash = MessageDigest.getInstance("SHA-256").digest(bytes);
} catch (NoSuchAlgorithmException e) {
// Always available.
throw new IllegalStateException(e);
}
// Case-insensitive file systems lose at most one bit of entropy per character, that is, the
// resulting file name still encodes more than 200 bits of entropy.
String basename = "seed-" + Base64.getUrlEncoder().withoutPadding().encodeToString(hash);
Path seed = javaSeedsDir.resolve(basename);
Files.move(tmpSeed, seed, StandardCopyOption.REPLACE_EXISTING);
}

@SuppressWarnings("OptionalGetWithoutIsPresent")
Expand Down