During December 2024, Daniel Xu focused on security hardening and kernel compatibility within the netdata/libbpf repository. He developed and integrated Memfd Noexec Seal enforcement by enabling the MFD_NOEXEC_SEAL flag during memfd creation, using C and leveraging his expertise in kernel development and system programming. To ensure broad compatibility, Daniel implemented a robust fallback path for older kernels lacking support for the flag, minimizing risk while maintaining functionality. This work reduced the potential for executing code from in-memory regions and silenced related kernel warnings, delivering a targeted, low-risk improvement that addressed both security concerns and cross-version kernel support.