On Wed, Jul 18, 2018 at 01:43:00PM -0700, Linus Torvalds wrote: > What I really think I'd prefer is to have some simple way to "poison" > current_cred(). It could be something as simple as a per-thread > counter, and we'd have current_cred() do > > WARN_ON_ONCE(in_interrupt() || current->cred_poison); Why is counter any better than LSB of a pointer?
