From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pl1-f199.google.com (mail-pl1-f199.google.com [209.85.214.199]) by kanga.kvack.org (Postfix) with ESMTP id DE4D86B000C for ; Fri, 5 Oct 2018 17:11:01 -0400 (EDT) Received: by mail-pl1-f199.google.com with SMTP id v4-v6so12291700plz.21 for ; Fri, 05 Oct 2018 14:11:01 -0700 (PDT) Received: from mail-sor-f65.google.com (mail-sor-f65.google.com. [209.85.220.65]) by mx.google.com with SMTPS id l15-v6sor8645970pfb.67.2018.10.05.14.11.00 for (Google Transport Security); Fri, 05 Oct 2018 14:11:00 -0700 (PDT) Date: Fri, 5 Oct 2018 14:10:58 -0700 From: Joel Fernandes Subject: Re: [PATCH RFC] mm: Add an fs-write seal to memfd Message-ID: <20181005211058.GA193964@joelaf.mtv.corp.google.com> References: <20181005192727.167933-1-joel@joelfernandes.org> <20181005125339.f6febfd3fcfdc69c6f408c50@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181005125339.f6febfd3fcfdc69c6f408c50@linux-foundation.org> Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton Cc: linux-kernel@vger.kernel.org, kernel-team@android.com, jreck@google.com, john.stultz@linaro.org, tkjos@google.com, gregkh@linuxfoundation.org, Al Viro , "J. Bruce Fields" , Jeff Layton , Khalid Aziz , linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, Mike Kravetz 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)" 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, - Joel