Re: CVS commit: src/sys/kern

[Nick Hudson <nick.hudson%gmx.co.uk@localhost>]

On 15/08/2019 23:05, matthew green wrote:
> "Maxime Villard" writes:
> > Module Name:	src
> > Committed By:	maxv
> > Date:		Thu Aug 15 12:06:42 UTC 2019
> >
> > Modified Files:
> > 	src/sys/kern: subr_kmem.c
> >
> > Log Message:
> > Retire KMEM_GUARD. It has been superseded by kASan, which is much more
> > powerful, has much more coverage - far beyond just kmem(9) -, and also
> > consumes less memory.
> >
> > KMEM_GUARD was a debug-only option that required special DDB tweaking, and
> > had no use in releases or even diagnostic kernels.
> >
> > As a general rule, the policy now is to harden the pool layer by default
> > in GENERIC, and use kASan as a diagnostic/debug/fuzzing feature to verify
> > each memory allocation & access in the system.
>
> was this discussed?
>
> KMEM_GUARD is useful for platforms that don't have kasan yet.

yet? Can 32bit platforms and limit KVA have KASAN?

Nick