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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EE8FAC433EF for ; Wed, 11 May 2022 03:15:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240691AbiEKDPw (ORCPT ); Tue, 10 May 2022 23:15:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41520 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240564AbiEKDPt (ORCPT ); Tue, 10 May 2022 23:15:49 -0400 Received: from mail-pj1-x1029.google.com (mail-pj1-x1029.google.com [IPv6:2607:f8b0:4864:20::1029]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E0CB312621 for ; Tue, 10 May 2022 20:15:46 -0700 (PDT) Received: by mail-pj1-x1029.google.com with SMTP id t11-20020a17090ad50b00b001d95bf21996so3682787pju.2 for ; Tue, 10 May 2022 20:15:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=5NqBhJncEVUk2Pf1eI7/8nYp94z8rVRASEDNRY/5rLM=; b=EL8jSIB4rrhW5MGwrl6kRzt6+DCrDQMJQn3wbDoSslBIhLXLMTRdCiUE/wf6D6RKui q6ETmlR97XQQj8+PGMEsY5P7lD6Jdhmnw/PaJXcRrD3mYNJfGVhf6nCHegcj1GcgmQ9w ZofttmOGg9O/2Iifq7pxjnJ84G8UsoIDtSHJs= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=5NqBhJncEVUk2Pf1eI7/8nYp94z8rVRASEDNRY/5rLM=; b=3zHldpejmkUOb4t+enKuVgRvYYw0y8jZxofO+Pl7hSHuwIlUpHl7MQ6C/xIbfRG4jq b+FtOZUBXhjCV+sMQpw/yWBaM2OHICBVpEuPLHS68zhbPq6rxinp3Lc01pjWnHmZ7Nji zxP3HUmXyjlVr2eva7740uvMsq3A2s55Lpl0nibHwmFaczJO976iIbWHG4zoIQQdat5Z GZrYdbSoSkb8kcfj5owoAk+qNW4KBvkgYQKfgmxPwXYYZm31IUS7ac0F6CgqFMAloY1y YcI/CqFCRR4ZrK733CJT74r5jBGwCj+WQYYbZd4ME3+LSQ++LmqzAGRfYC5h7CBb8R+m HRtQ== X-Gm-Message-State: AOAM533DWX/oml8+p8shAdbFXzzFdWSOov8w7FXaqX0NgrrANwdSJDwN 3prUdrOVhSYzQDM7vMvjC3ir4w== X-Google-Smtp-Source: ABdhPJyd1dEIvJa9UluCWVd8wprzlfzW7U7Y7P5K4Bg/8vGrg1CSsd9HHwgnpnEfcVwwjxYOlZuFbw== X-Received: by 2002:a17:902:d2ce:b0:15e:c024:6635 with SMTP id n14-20020a170902d2ce00b0015ec0246635mr24185444plc.28.1652238946411; Tue, 10 May 2022 20:15:46 -0700 (PDT) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id x8-20020a17090a788800b001dbe11be891sm2567976pjk.44.2022.05.10.20.15.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 May 2022 20:15:46 -0700 (PDT) Date: Tue, 10 May 2022 20:15:45 -0700 From: Kees Cook To: "Edgecombe, Rick P" Cc: "Weiny, Ira" , "hpa@zytor.com" , "Williams, Dan J" , "Shankar, Ravi V" , "Yu, Fenghua" , "linux-kernel@vger.kernel.org" , "dave.hansen@linux.intel.com" , "linux-hardening@vger.kernel.org" Subject: Re: [PATCH V10 14/44] mm/pkeys: Introduce pks_set_readwrite() Message-ID: <202205102008.88C15972@keescook> References: <20220419170649.1022246-1-ira.weiny@intel.com> <20220419170649.1022246-15-ira.weiny@intel.com> <202205091304.434A9B45@keescook> <202205101504.5B5C693F7C@keescook> <76ee55622592d531c82cb42b96d4bb27deb26287.camel@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <76ee55622592d531c82cb42b96d4bb27deb26287.camel@intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, May 10, 2022 at 10:26:43PM +0000, Edgecombe, Rick P wrote: > v2: > https://lore.kernel.org/lkml/20210830235927.6443-1-rick.p.edgecombe@intel.com/#r > > Mostly it fit together pretty easily, but there was memory overhead > required to protect the page tables that map the direct map fully > (unless a better solution can be found). Oh my, I totally missed this. Yay for Too Much Email Every Day. ;) I'll give this a read; thanks for working on it! Also, can you speak to the schedule of availability for PKS? -- Kees Cook