Hi Michael, The r2 value is stored to the livepatch stack prior to entering into the livepatched code, so accessing it will gurantee the previous value is restored. Also, yes, this bug is caused by tooling that "scoops out" pre-compiled code and places it into the livepatch handler (e.g. kpatch). However, since the large majority of customers interact with the livepatch subsystem through tooling, and this fix would not pose any serious risk to either usability or security (other than those already present in livepatching), plus it would solve a large problem for these tools with a simple fix, I feel as though this would be a useful update to livepatch. Thanks, Ryan
