From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.4 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B7B4AC433E0 for ; Wed, 20 May 2020 20:17:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8435120823 for ; Wed, 20 May 2020 20:17:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="EfnCZypm" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727776AbgETURd (ORCPT ); Wed, 20 May 2020 16:17:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54446 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726860AbgETURc (ORCPT ); Wed, 20 May 2020 16:17:32 -0400 Received: from mail-io1-xd44.google.com (mail-io1-xd44.google.com [IPv6:2607:f8b0:4864:20::d44]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id ABD59C061A0E for ; Wed, 20 May 2020 13:17:32 -0700 (PDT) Received: by mail-io1-xd44.google.com with SMTP id x5so4785417ioh.6 for ; Wed, 20 May 2020 13:17:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=VyaSYeCN7SlfNpIcnaBLrvnj4Za8Y5YWee7k0M093LM=; b=EfnCZypmdGa8VpCH0ge9lM32x0XwnmHj2izqsNgRTS3I07JG3e/hF4lLCo5kXYO4/g GtxgCniYtCnG++FB/8kG6zPSRmFLKhxRqmmq4IdVKeBaftKKpwV9wCZorD+0tHjfkdlf iKIaBkXsdUOcUzEbaSjKSZqabgCT3OCAuVYYojsL0oGeaGv8yix5Xa36HevdrmZQA1d3 oZiCFN22Zq85rpV1iC6H6WuqAmzoFZO6oguZ9pkB1ojjDMsp42z1ILZhpfs69Ar45MbZ DEZchCUERGXKZVtVhJ2ntdiyp4CuUJlSp/UEMGtBpuJcdmq5WBjbssYBuRlEU2sLgeuf ZmiA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=VyaSYeCN7SlfNpIcnaBLrvnj4Za8Y5YWee7k0M093LM=; b=uWUuI5+B5EAxy0Kfcs9x+lTT0vabyH929o//PT2Z1rEBs5FKXM3ul1/b1COnj7C1oS 2d6iF5yG2T7MgFw6y4jFvLwjyRrpoKXhZNzM0i35sWUl+4eVzQEjGPWVz8lFqqV7ntH3 VsjvkKQHt4y3po+Q8Eo/T6XOmlQSWvfSp14gelFaVglcmLpVS4MCDSJ09I8Ly+Bl6xKE 4xW+1Pl7Paf1ZvX8w+IGLSffF+Pn8Aqa/36Py3WTPGSGU8CH2N0/HJjCGgdfU49USh7Q jqLFctyQp/E8HW4yGElcQRiG2m6hm3ER+xgsVRN1RW96L9viFCNQs+quvwcQTvcUb7ee JlYQ== X-Gm-Message-State: AOAM530jWiKO2cPb2duxIMNYvQI4UneQVmJ5/nYg8Q2MhsMj6xcbP6ho I5DlMMBhpkFS/qknM3HOuIIcin+xPxJKJy6A5LMC3Q== X-Google-Smtp-Source: ABdhPJxf5r3SCDgK6PuxVrPSpsHX45TKCMtlgHtmR2oB4Pr8N10SC5JVUCM3UWZi1m7AGto9SCPNRm16+lOlW4mhbLA= X-Received: by 2002:a5d:8a10:: with SMTP id w16mr4683295iod.95.1590005851709; Wed, 20 May 2020 13:17:31 -0700 (PDT) MIME-Version: 1.0 References: <20200423002632.224776-1-dancol@google.com> <20200423002632.224776-3-dancol@google.com> <20200508125054-mutt-send-email-mst@kernel.org> <20200508125314-mutt-send-email-mst@kernel.org> <20200520045938.GC26186@redhat.com> <202005200921.2BD5A0ADD@keescook> <20200520194804.GJ26186@redhat.com> <20200520195134.GK26186@redhat.com> In-Reply-To: <20200520195134.GK26186@redhat.com> From: Lokesh Gidra Date: Wed, 20 May 2020 13:17:20 -0700 Message-ID: Subject: Re: [PATCH 2/2] Add a new sysctl knob: unprivileged_userfaultfd_user_mode_only To: Andrea Arcangeli , Suren Baghdasaryan Cc: Kees Cook , "Michael S. Tsirkin" , Daniel Colascione , Jonathan Corbet , Alexander Viro , Luis Chamberlain , Iurii Zaikin , Mauro Carvalho Chehab , Andrew Morton , Andy Shevchenko , Vlastimil Babka , Mel Gorman , Sebastian Andrzej Siewior , Peter Xu , Mike Rapoport , Jerome Glisse , Shaohua Li , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Tim Murray , Minchan Kim , Sandeep Patil , kernel@android.com Content-Type: text/plain; charset="UTF-8" Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org Adding the Android kernel team in the discussion. On Wed, May 20, 2020 at 12:51 PM Andrea Arcangeli wrote: > > On Wed, May 20, 2020 at 03:48:04PM -0400, Andrea Arcangeli wrote: > > The sysctl /proc/sys/kernel/unprivileged_bpf_disabled is already there > > Oops I picked the wrong unprivileged_* :) of course I meant: > /proc/sys/vm/unprivileged_userfaultfd >