User-mode

https://github.com/adrianreber/criu/tree/non-root

Known issues

• PR_SET_MM_MAP is required (the kernel version >= 3.18)
• shared memory can't be dumped from a non-root user

Error: Can't open 24/map_files/7f72d1687000-7f72d1688000 on procfs: Operation not permitted

• criu restore doesn't work

Error: Write 29 to sys/kernel/ns_last_pid: Operation not permitted

• criu restore works in a new userns only if setgroups is set to "allow"

pie: 235: Error (criu/pie/restorer.c:172): Can't setup supplementary groups

• PTRACE_O_SUSPEND_SECCOMP and PTRACE_SECCOMP_GET_FILTER require the root CAP_SYS_ADMIN (ptrace_setoptions)

FIXME: describe checkpoint/restore as an unprivileged (non-root) user.