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=-10.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 BA2EAC433ED for ; Wed, 19 May 2021 00:44:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 90CFB6108B for ; Wed, 19 May 2021 00:44:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234097AbhESApo (ORCPT ); Tue, 18 May 2021 20:45:44 -0400 Received: from mail.kernel.org ([198.145.29.99]:60578 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240106AbhESApn (ORCPT ); Tue, 18 May 2021 20:45:43 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 9D59F6135B; Wed, 19 May 2021 00:44:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1621385064; bh=TaIIw0YYtenqp7/hfp+Brr2pi7x+J7tKiTwiGcf4BXo=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=OWqlmtzTKs7bvcu6OsrPtdFoycSizT0julGnQ1nL89UDOP47oOx68Qc7/VuYXRLHl PNVwvj+VZTjuZY29zaA8iT4YqSTgqnpaEgh3VOC71g9NKcI8TaUUyHgG2IXdNHcZ/n vJFCM+BcjPVeDtUlkhRioxH5rtQ7jgaUQXdaR9z4= Date: Tue, 18 May 2021 17:44:22 -0700 From: Andrew Morton To: Mike Rapoport Cc: Alexander Viro , Andy Lutomirski , Arnd Bergmann , Borislav Petkov , Catalin Marinas , Christopher Lameter , Dan Williams , Dave Hansen , David Hildenbrand , Elena Reshetova , "H. Peter Anvin" , Hagen Paul Pfeifer , Ingo Molnar , James Bottomley , James Bottomley , Kees Cook , "Kirill A. Shutemov" , Matthew Wilcox , Matthew Garrett , Mark Rutland , Michal Hocko , Mike Rapoport , Michael Kerrisk , Palmer Dabbelt , Palmer Dabbelt , Paul Walmsley , Peter Zijlstra , "Rafael J. Wysocki" , Rick Edgecombe , Roman Gushchin , Shakeel Butt , Shuah Khan , Thomas Gleixner , Tycho Andersen , Will Deacon , Yury Norov , 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 Subject: Re: [PATCH v20 4/7] mm: introduce memfd_secret system call to create "secret" memory areas Message-Id: <20210518174422.399ad118a051fe4c5b11d7ba@linux-foundation.org> In-Reply-To: <20210518072034.31572-5-rppt@kernel.org> References: <20210518072034.31572-1-rppt@kernel.org> <20210518072034.31572-5-rppt@kernel.org> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-api@vger.kernel.org On Tue, 18 May 2021 10:20:31 +0300 Mike Rapoport wrote: > From: Mike Rapoport > > Introduce "memfd_secret" system call with the ability to create memory > areas visible only in the context of the owning process and not mapped not > only to other processes but in the kernel page tables as well. > > ... > > --- a/mm/Kconfig > +++ b/mm/Kconfig > @@ -901,4 +901,9 @@ config KMAP_LOCAL > # struct io_mapping based helper. Selected by drivers that need them > config IO_MAPPING > bool > + > +config SECRETMEM > + def_bool ARCH_HAS_SET_DIRECT_MAP && !EMBEDDED > + select STRICT_DEVMEM > + > endmenu WARNING: unmet direct dependencies detected for STRICT_DEVMEM Depends on [n]: MMU [=y] && DEVMEM [=n] && (ARCH_HAS_DEVMEM_IS_ALLOWED [=y] || GENERIC_LIB_DEVMEM_IS_ALLOWED [=n]) Selected by [y]: - SECRETMEM [=y] so I went back to the v19 version, with --- a/mm/Kconfig~mm-introduce-memfd_secret-system-call-to-create-secret-memory-areas-fix +++ a/mm/Kconfig @@ -907,6 +907,5 @@ config IO_MAPPING config SECRETMEM def_bool ARCH_HAS_SET_DIRECT_MAP && !EMBEDDED - select STRICT_DEVMEM endmenu _