linux-kernel - Re: [PATCH] mm: Allow userland to request that the kernel clear memory on release

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Message-ID: <CACdnJuup-y1xAO93wr+nr6ARacxJ9YXgaceQK9TLktE7shab1w@mail.gmail.com>
Date:   Wed, 24 Apr 2019 13:22:32 -0700
From:   Matthew Garrett <mjg59@...gle.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     linux-mm@...ck.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: Allow userland to request that the kernel clear
 memory on release

On Wed, Apr 24, 2019 at 1:20 PM Matthew Wilcox <willy@...radead.org> wrote:
> It depends on the semantics you want.  There's no legacy code to
> worry about here.  I was seeing this as the equivalent of an atexit()
> handler; userspace is saying "When this page is unmapped, zero it".
> So it doesn't matter that somebody else might be able to reference it --
> userspace could have zeroed it themselves.

Mm ok that seems reasonable. I'll rework with that in mind.