On Wed, 2020-07-15 at 19:41 -0700, Kees Cook wrote:
> On Wed, Jul 15, 2020 at 11:47:11AM +0800, David Gow wrote:
> > - The inheriting of the mm stuff still means that
> > copy_{from,to}_user() will only work if loaded as a module. This
> > really needs to be documented. (Ideally, we'd find a way of having
> > this work even for built-in tests, but I don't have any real ideas
> > as
> > to how that could be done).
>
> I'd like to better understand this ... are there conditions where
> vm_mmap() doesn't work? I thought this would either use current()
> (e.g.
> how LKDTM uses it when getting triggered from debugfs), or use
> init_mm.
>
> I'd really like to see the mm patch more well described/justified.
>
Sure, I'll describe the patch better.
Thanks for the review.
