On Wed, Apr 17, 2019 at 03:41:52PM +0200, Michal Hocko <mhocko@xxxxxxxxxx> wrote: > Don't we need to use the lock in prctl_set_mm as well then? Correct. The patch alone just moves the race from get_cmdline/prctl_set_mm_map to get_cmdline/prctl_set_mm. arg_lock could be used in prctl_set_mm but the better idea (IMO) is complete removal of that code in favor of prctl_set_mm_map [1]. Michal [1] https://lore.kernel.org/lkml/20180405182651.GM15783@xxxxxxxxxx/
