1# ArkCompiler Subsystem Changelog 2## cl.arkcompiler.1 Deleted /dev/ubsan/ 3 4**Access Level** 5 6Others 7 8**Reason for Change** 9 101. The **/dev/ubsan** directory on the device is used to archive UBSan logs. With DFX integration, logs are saved to the **/data/log/faultlog/faultlogger** directory. The **/dev/ubsan** directory is no longer required. 112. The **/dev/ubsan** directory cannot isolate read and write permissions among different users, which poses security risks. 12 13**Change Impact** 14 15This change is a non-compatible change. 16 17The **/dev/ubsan** directory can no longer be read or written. 18 19**Change Since** 20 21OpenHarmony 5.0.0.46 22 23**Key API/Component Changes** 24 25Before change: The **/dev/ubsan/** directory can be read and written. 26 27After change: The **/dev/ubsan/** directory cannot be read or written. 28 29**Adaptation Guide** 30 31N/A 32