fix(go/binary): check file mode (fanal#281)

Author: knqyf263

analyzer/language/golang/binary/binary.go

@@ -28,8 +28,13 @@ func (a gobinaryLibraryAnalyzer) Analyze(target analyzer.AnalysisTarget) (*analy
 }
 
 func (a gobinaryLibraryAnalyzer) Required(_ string, fileInfo os.FileInfo) bool {
+	mode := fileInfo.Mode()
+	if !mode.IsRegular() {
+		return false
+	}
+
 	// Check executable file
-	if fileInfo.Mode()&0111 != 0 {
+	if mode.Perm()&0111 != 0 {
 		return true
 	}
 	return false

analyzer/language/golang/binary/binary_test.go

@@ -81,11 +81,16 @@ func Test_gobinaryLibraryAnalyzer_Required(t *testing.T) {
 			filePath: "testdata/0644",
 			want:     false,
 		},
+		{
+			name:     "symlink",
+			filePath: "testdata/symlink",
+			want:     false,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			a := gobinaryLibraryAnalyzer{}
-			fileInfo, err := os.Stat(tt.filePath)
+			fileInfo, err := os.Lstat(tt.filePath)
 			require.NoError(t, err)
 			got := a.Required(tt.filePath, fileInfo)
 			assert.Equal(t, tt.want, got, fileInfo.Mode().Perm())

analyzer/language/golang/binary/testdata/foo

@@ -0,0 +1 @@
+foo