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

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Message-ID: <CAEXW_YSZOCsmtyJnfbvG-P+cQLM8WyohyDGe_FRxi_Xea2aw6Q@mail.gmail.com>
Date:   Fri, 5 Oct 2018 15:31:37 -0700
From:   Joel Fernandes <joel@...lfernandes.org>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>,
        kernel-team <kernel-team@...roid.com>,
        John Reck <jreck@...gle.com>,
        John Stultz <john.stultz@...aro.org>,
        Todd Kjos <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 5, 2018 at 3:28 PM, Greg KH <gregkh@...uxfoundation.org> wrote:
> 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.


Sure, I will do add to those self-tests.

thanks,

 - Joel