fix: go version not properly identified in binary (#1384)

syft/pkg/cataloger/binary/classifier.go

@@ -91,6 +91,12 @@ func fileNameTemplateVersionMatcher(fileNamePattern string, contentTemplate stri
 	}
 }
 
+func patternEndingWithNull(pattern string) string {
+	bytes := []byte(pattern)
+	bytes = append(bytes, 0)
+	return string(bytes)
+}
+
 func fileContentsVersionMatcher(pattern string) evidenceMatcher {
 	pat := regexp.MustCompile(pattern)
 	return func(classifier classifier, reader source.LocationReadCloser) ([]pkg.Package, error) {
@@ -130,6 +136,7 @@ func singlePackage(classifier classifier, reader source.LocationReadCloser, vers
 		Locations:    source.NewLocationSet(reader.Location),
 		Type:         pkg.BinaryPkg,
 		CPEs:         cpes,
+		FoundBy:      catalogerName,
 		MetadataType: pkg.BinaryMetadataType,
 		Metadata: pkg.BinaryMetadata{
 			Classifier:  classifier.Class,

syft/pkg/cataloger/binary/default_classifiers.go

@@ -29,9 +29,10 @@ var defaultClassifiers = []classifier{
 	{
 		Class:    "go-binary",
 		FileGlob: "**/go",
-		EvidenceMatcher: fileContentsVersionMatcher(
-			`(?m)go(?P<version>[0-9]+\.[0-9]+(\.[0-9]+|beta[0-9]+|alpha[0-9]+|rc[0-9]+)?)`),
+		EvidenceMatcher: fileContentsVersionMatcher(patternEndingWithNull(
+			`(?m)go(?P<version>[0-9]+\.[0-9]+(\.[0-9]+|beta[0-9]+|alpha[0-9]+|rc[0-9]+)?)`)),
 		Package: "go",
+		CPEs:    singleCPE("cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*"),
 	},
 	{
 		Class:    "nodejs-binary",