linux-kernel - Re: [PATCH RFC] mm: Add an fs-write seal to memfd

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Message-Id: <20181005125339.f6febfd3fcfdc69c6f408c50@linux-foundation.org>
Date:   Fri, 5 Oct 2018 12:53:39 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     "Joel Fernandes (Google)" <joel@...lfernandes.org>
Cc:     linux-kernel@...r.kernel.org, kernel-team@...roid.com,
        jreck@...gle.com, john.stultz@...aro.org, tkjos@...gle.com,
        gregkh@...uxfoundation.org, Al Viro <viro@...iv.linux.org.uk>,
        "J. Bruce Fields" <bfields@...ldses.org>,
        Jeff Layton <jlayton@...nel.org>,
        Khalid Aziz <khalid.aziz@...cle.com>,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        Mike Kravetz <mike.kravetz@...cle.com>
Subject: Re: [PATCH RFC] mm: Add an fs-write seal to memfd

On Fri,  5 Oct 2018 12:27:27 -0700 "Joel Fernandes (Google)" <joel@...lfernandes.org> wrote:

> To support the usecase, this patch adds a new F_SEAL_FS_WRITE seal which
> prevents any future mmap and write syscalls from succeeding while
> keeping the existing mmap active. The following program shows the seal
> working in action:

Please be prepared to create a manpage patch for this one.