code: private List<String> existingRWPaths() {
          String[] lines = mountReader();
          List<String> pathsFound = new ArrayList<>();
          for (String line : lines) {
              // Split lines into parts
              String[] args = line.split(" ");
              if (args.length < 4){
                  // If we don't have enough options per line, skip this and log an error
                  Log.e(TAG, String.format("Error formatting mount: %s", line));
                  continue;
              }
              String mountPoint = args[1];
              String mountOptions = args[3];
  
              for (String pathToCheck : PATHS_THAT_SHOULD_NOT_BE_WRITABLE) {
                  if (mountPoint.equalsIgnoreCase(pathToCheck)) {
                      // Split options out and compare against "rw" to avoid false positives
                      for (String option : mountOptions.split(",")){
                          if (option.equalsIgnoreCase("rw")){
                              pathsFound.add(pathToCheck);
                              break;
                          }
                      }
                  }
              }
          }
          return pathsFound;
      }
docs: When you're root you can change the write permissions on common system directories.
  This method checks if any of the paths in PATHS_THAT_SHOULD_NOT_BE_WRITABLE are writable.
  @return all paths that are writable