https://github.com/rime/librime/issues/316
https://github.com/rime/librime/commit/90839b0b3d47cbfef715ea5f061c7505666ff75d

--- /src/rime/setup.cc
+++ /src/rime/setup.cc
@@ -35,6 +35,8 @@
 
 RIME_API void SetupLogging(const char* app_name) {
 #ifdef RIME_ENABLE_LOGGING
+  // Do not allow other users to read/write log files created by current process.
+  FLAGS_logfile_mode = 0600;
   google::InitGoogleLogging(app_name);
 #endif  // RIME_ENABLE_LOGGING
 }