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On Ubuntu and probably other distros, ptrace permissions are tightend a bit by default; i.e., /proc/sys/kernel/yama/ptrace_score is set to 1. This cases memfd_secret's ptrace attach test fails with a permission error. Set it to 0 piror to running the program. Link: https://lkml.kernel.org/r/20231030-selftest-v1-1-743df68bb996@linux.dev Signed-off-by: Itaru Kitayama <itaru.kitayama@linux.dev> Cc: Shuah Khan <shuah@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>