Re: [PATCH] mm/mincore: allow for making sys_mincore() privileged

[Jiri Kosina]

On Thu, 10 Jan 2019, Dave Chinner wrote:

> > Yeah, preadv2(RWF_NOWAIT) is in the same teritory as mincore(), it has 
> > "just" been overlooked. I can't speak for Daniel, but I believe he might 
> > be ok with rephrasing the above as "Restricting mincore() and RWF_NOWAIT 
> > is sufficient ...".
> 
> Good luck with restricting RWF_NOWAIT. I eagerly await all the
> fstests that exercise both the existing and new behaviours to
> demonstrate they work correctly.

Well, we can still resurrect my original aproach of doing this opt-in 
based on a sysctl setting, and letting the admin choose his poison.

If 'secure' mode is selected, RWF_NOWAIT will then probably just always 
fail wit EAGAIN.

-- 
Jiri Kosina
SUSE Labs