Re: [RFC PATCH v3 11/11] mseal:add documentation

[Theo de Raadt]

Jeff Xu <jeffxu@xxxxxxxxxxxx> wrote:

> > Jeff - mind changing the EACESS to EPERM, and we'll have something
> > that is more-or-less compatible between Linux and OpenBSD?
> >
> Sounds Good. I will make the necessary changes in the next version.

Thanks!  That is so awesome!

On the OpenBSD side, I am close to landing our madvise / msync changes.

Then we are mostly in sync.

It was on my radar for a year, but delayed because I was ponderingn
blocking the destructive madvise / msync ops on regular non-writeable
pages.  These ops remain a page-zero gadget against regular (mutable)
readonly pages, and it bothers me.  I've heard rumour this has been used
in a nasty way, and I think the sloppily defined semantics could use
a strict modernization.