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

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Message-ID: <20181005222820.GB13613@kroah.com>
Date:   Fri, 5 Oct 2018 15:28:20 -0700
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Joel Fernandes <joel@...lfernandes.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, kernel-team@...roid.com,
        jreck@...gle.com, john.stultz@...aro.org, tkjos@...gle.com,
        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, Oct 05, 2018 at 02:10:58PM -0700, Joel Fernandes wrote:
> On Fri, Oct 05, 2018 at 12:53:39PM -0700, Andrew Morton wrote:
> > 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.
> 
> Sure, I will do that. thanks,

And a test case to the in-kernel memfd tests would be appreciated.

thanks,

greg k-h