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Date:   Fri, 5 Oct 2018 15:28:20 -0700
From:   Greg KH <gregkh@linuxfoundation.org>
To:     Joel Fernandes <joel@joelfernandes.org>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        linux-kernel@vger.kernel.org, kernel-team@android.com,
        jreck@google.com, john.stultz@linaro.org, tkjos@google.com,
        Al Viro <viro@zeniv.linux.org.uk>,
        "J. Bruce Fields" <bfields@fieldses.org>,
        Jeff Layton <jlayton@kernel.org>,
        Khalid Aziz <khalid.aziz@oracle.com>,
        linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
        Mike Kravetz <mike.kravetz@oracle.com>
Subject: Re: [PATCH RFC] mm: Add an fs-write seal to memfd
Message-ID: <20181005222820.GB13613@kroah.com>
References: <20181005192727.167933-1-joel@joelfernandes.org>
 <20181005125339.f6febfd3fcfdc69c6f408c50@linux-foundation.org>
 <20181005211058.GA193964@joelaf.mtv.corp.google.com>
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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@joelfernandes.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