Worked on the linux-test-project/ltp repository, focusing on improving the reliability of kernel testing for stack-related scenarios. Addressed a critical bug in the sigaltstack01 test by correcting a boundary-check logic error, replacing a logical AND with an OR to ensure accurate validation of alternative stack boundaries. This change, implemented in C, prevents out-of-bounds conditions and reduces false negatives, particularly in environments like Gramine-SGX that require larger stack reservations. Demonstrated strong debugging and test-writing skills, delivering a focused, single-commit patch with clear documentation. The work emphasized careful change management and a deep understanding of system calls and kernel-level testing.