On Wed, Feb 09, 2022 at 02:18:42AM +0000, Edgecombe, Rick P wrote: ... > > Still wrapping my head around the CRIU save and restore steps, but > another general approach might be to give ptrace the ability to > temporarily pause/resume/set CET enablement and SSP for a stopped > thread. Then injected code doesn't need to jump through any hoops or > possibly run into road blocks. I'm not sure how much this opens things > up if the thread has to be stopped... > > Cyrill, could it fit into the CRIU pause and resume flow? What action > causes the final resuming of execution of the restored process for > checkpointing and for restore? Wondering if we could somehow make CET > re-enable exactly then. > > And I guess this also needs a way to create shadow stack allocations at > a specific address to match where they were in the dumped process. That > is missing in this series. Thanks Rick! This sounds like an option. I need a couple of days to refresh my memory about criu internals. Let me CC a few current active criu developers (CC list is already big enough though:), maybe this will speedup the procedure.
