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=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 1F549C4741F for ; Mon, 9 Nov 2020 10:42:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C2FDB206C0 for ; Mon, 9 Nov 2020 10:42:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727077AbgKIKmN (ORCPT ); Mon, 9 Nov 2020 05:42:13 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55546 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726423AbgKIKmM (ORCPT ); Mon, 9 Nov 2020 05:42:12 -0500 Received: from mout-p-102.mailbox.org (mout-p-102.mailbox.org [IPv6:2001:67c:2050::465:102]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 99AB1C0613CF; Mon, 9 Nov 2020 02:42:12 -0800 (PST) Received: from smtp2.mailbox.org (smtp2.mailbox.org [IPv6:2001:67c:2050:105:465:1:2:0]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-384) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mout-p-102.mailbox.org (Postfix) with ESMTPS id 4CV6xs6XHyzQkm5; Mon, 9 Nov 2020 11:42:09 +0100 (CET) X-Virus-Scanned: amavisd-new at heinlein-support.de Received: from smtp2.mailbox.org ([80.241.60.241]) by gerste.heinlein-support.de (gerste.heinlein-support.de [91.198.250.173]) (amavisd-new, port 10030) with ESMTP id GrIZVsje57hw; Mon, 9 Nov 2020 11:42:04 +0100 (CET) Date: Mon, 9 Nov 2020 11:41:59 +0100 (CET) From: Hagen Paul Pfeifer To: Mike Rapoport Cc: Andrew Morton , Alexander Viro , Andy Lutomirski , Arnd Bergmann , Borislav Petkov , Catalin Marinas , Christopher Lameter , Dan Williams , Dave Hansen , David Hildenbrand , Elena Reshetova , "H. Peter Anvin" , Idan Yaniv , Ingo Molnar , James Bottomley , "Kirill A. Shutemov" , Matthew Wilcox , Mark Rutland , Mike Rapoport , Michael Kerrisk , Palmer Dabbelt , Paul Walmsley , Peter Zijlstra , Thomas Gleixner , Shuah Khan , Tycho Andersen , Will Deacon , linux-api@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-nvdimm@lists.01.org, linux-riscv@lists.infradead.org, x86@kernel.org Message-ID: <651318720.14321.1604918519928@office.mailbox.org> In-Reply-To: <20201104170247.GT4879@kernel.org> References: <20200924132904.1391-1-rppt@kernel.org> <20201101110935.GA4105325@laniakea> <20201102154028.GD4879@kernel.org> <1547601988.128687.1604411534845@office.mailbox.org> <20201103163002.GK4879@kernel.org> <1988407921.138656.1604489953944@office.mailbox.org> <20201104170247.GT4879@kernel.org> Subject: Re: [PATCH v6 0/6] mm: introduce memfd_secret system call to create "secret" memory areas MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Priority: 3 Importance: Normal X-MBO-SPAM-Probability: X-Rspamd-Score: -3.01 / 15.00 / 15.00 X-Rspamd-Queue-Id: 2C76B177D X-Rspamd-UID: 6438b0 Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org > On 11/04/2020 6:02 PM Mike Rapoport wrote: > > Yes, this will work. The processes that share the memfd_secret file > descriptor will have access to the same memory pages, pretty much like > with shared memory. Perfect! Acked-by: Hagen Paul Pfeifer Thank you for the effort Mike, if zeroize feature will also included it will be great! The memset-all-pages after use is just overkill, a dedicated flag for memfd_secret (or mmap) would be superior. Hagen