diff -r 2251ba078bec -r eb7ce841ccec src/share/vm/memory/metaspaceShared.cpp
--- a/src/share/vm/memory/metaspaceShared.cpp	Sat Oct 24 16:18:50 2020 +0800
+++ b/src/share/vm/memory/metaspaceShared.cpp	Sat Oct 24 16:43:47 2020 +0800
@@ -723,12 +723,15 @@
     int class_list_path_len = (int)strlen(class_list_path_str);
     if (class_list_path_len >= 3) {
       if (strcmp(class_list_path_str + class_list_path_len - 3, "lib") != 0) {
-        strcat(class_list_path_str, os::file_separator());
-        strcat(class_list_path_str, "lib");
+        jio_snprintf(class_list_path_str + class_list_path_len,
+                     sizeof(class_list_path_str) - class_list_path_len,
+                     "%slib", os::file_separator());
+        class_list_path_len += 4;
       }
     }
-    strcat(class_list_path_str, os::file_separator());
-    strcat(class_list_path_str, "classlist");
+    jio_snprintf(class_list_path_str + class_list_path_len,
+                 sizeof(class_list_path_str) - class_list_path_len,
+                 "%sclasslist", os::file_separator());
     class_list_path = class_list_path_str;
   } else {
     class_list_path = SharedClassListFile;