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 CCCF7C433F5 for ; Tue, 4 Oct 2022 00:00:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230009AbiJDAAx (ORCPT ); Mon, 3 Oct 2022 20:00:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46114 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229890AbiJDAAa (ORCPT ); Mon, 3 Oct 2022 20:00:30 -0400 Received: from mail-pf1-x431.google.com (mail-pf1-x431.google.com [IPv6:2607:f8b0:4864:20::431]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 224001788B for ; Mon, 3 Oct 2022 17:00:25 -0700 (PDT) Received: by mail-pf1-x431.google.com with SMTP id y136so11588540pfb.3 for ; Mon, 03 Oct 2022 17:00:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date; bh=o2b6tkTm79Hq7cBFTASISNpumWfJdTPRV3REM28Za+c=; b=RHkLlXama069cxi74bxt00Ik3yKbCp7eqcjpJ+BrwE/1Guzo7yRXeE2Mlwg9/Q1pft FpU8rWJ0zhvXTgdtu5ZrT9wcAMy8omqjXqtd+QnQLb72g+yiqjNZwXumr+AvRy9LNXuJ PhYt7Z/apm2VoEc6VJGKm4Os53iN72KHY4TqU= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date; bh=o2b6tkTm79Hq7cBFTASISNpumWfJdTPRV3REM28Za+c=; b=BXWWyUrCSMdNFarEVwuqH+98+RLB8rWx8Ulxn0Ja6dEIio3qRuvxXeZzuq1qzmXK46 RJEyv5VCzQArAazT1azPFCM3DwWYs/d5xDidkInqXRH5hNpQviz7E32YGCls9xFXSnaq Naz7KEpfbTWokmmteU6aJkQxpwyKIycKOX6W28fcZYRnEi2EwssPe2GGdfO2xL5NHz4/ rqc+Y3boe92qvmyLMmiA22IAT1LbPTuLqryrZuNKX4Y86mCYJPpZHUaOIx6EcTVigTU0 IM7S7BoP2fSlCxPd3flCcg3TH0xXkDs1QfBFjRdZP2/Wji64QqGhio6M9hWCFZ/wiMuU mCCw== X-Gm-Message-State: ACrzQf2K+ynWAoY5W89UepQGkyYy4uS31CqTpyRhYhmah8AwHRcok7E8 kt/tzJx6M3sJB3Fkc8niMnHSVQ== X-Google-Smtp-Source: AMsMyM4XTe6Addd3B3fzFGMr8MXv7g/1myw41iKI39g5lf9c2CLcuvJt36Ijei3dGll/IC1/xnbqFA== X-Received: by 2002:a63:5d48:0:b0:43a:390b:2183 with SMTP id o8-20020a635d48000000b0043a390b2183mr20651434pgm.29.1664841624524; Mon, 03 Oct 2022 17:00:24 -0700 (PDT) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id u13-20020a170902e80d00b00178ac4e70dcsm7787131plg.185.2022.10.03.17.00.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Oct 2022 17:00:23 -0700 (PDT) Date: Mon, 3 Oct 2022 17:00:23 -0700 From: Kees Cook To: Rick Edgecombe Cc: x86@kernel.org, "H . Peter Anvin" , Thomas Gleixner , Ingo Molnar , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, Arnd Bergmann , Andy Lutomirski , Balbir Singh , Borislav Petkov , Cyrill Gorcunov , Dave Hansen , Eugene Syromiatnikov , Florian Weimer , "H . J . Lu" , Jann Horn , Jonathan Corbet , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek , Peter Zijlstra , Randy Dunlap , "Ravi V . Shankar" , Weijiang Yang , "Kirill A . Shutemov" , joao.moreira@intel.com, John Allen , kcc@google.com, eranian@google.com, rppt@kernel.org, jamorris@linux.microsoft.com, dethoma@microsoft.com, Mike Rapoport Subject: Re: [OPTIONAL/RFC v2 38/39] x86/cet/shstk: Add ARCH_CET_UNLOCK Message-ID: <202210031700.3C9BB219A@keescook> References: <20220929222936.14584-1-rick.p.edgecombe@intel.com> <20220929222936.14584-39-rick.p.edgecombe@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220929222936.14584-39-rick.p.edgecombe@intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Sep 29, 2022 at 03:29:35PM -0700, Rick Edgecombe wrote: > From: Mike Rapoport > > Userspace loaders may lock features before a CRIU restore operation has > the chance to set them to whatever state is required by the process > being restored. Allow a way for CRIU to unlock features. Add it as an > arch_prctl() like the other CET operations, but restrict it being called > by the ptrace arch_pctl() interface. Hrm, please make this build-depend on CRIU... -- Kees Cook