At the start of the term, I pass a class roster around during my class, so students can check their info. Is this bad practice?

While there is an expectation that students may learn each other's names through the course of regular class activities during the term, official class rosters include student names and ID numbers, which may not be disclosed without the advance written consent of each individual student. A better approach would be to encourage your students to go to My ASU to confirm their registration. If they have individual questions or concerns, they should contact any registration location.