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

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Date: Sat, 20 Jan 2024 17:43:32 -0700
From: "Theo de Raadt" <deraadt@...nbsd.org>
To: Jeff Xu <jeffxu@...omium.org>
cc: Linus Torvalds <torvalds@...ux-foundation.org>,
    Stephen Röttger <sroettger@...gle.com>,
    Jeff Xu <jeffxu@...gle.com>, akpm@...ux-foundation.org,
    keescook@...omium.org, jannh@...gle.com, willy@...radead.org,
    gregkh@...uxfoundation.org, jorgelo@...omium.org,
    groeck@...omium.org, linux-kernel@...r.kernel.org,
    linux-kselftest@...r.kernel.org, linux-mm@...ck.org,
    pedro.falcato@...il.com, dave.hansen@...el.com,
    linux-hardening@...r.kernel.org
Subject: Re: [RFC PATCH v3 11/11] mseal:add documentation

Jeff Xu <jeffxu@...omium.org> 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.