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=-7.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 16CF4C433DF for ; Wed, 15 Jul 2020 01:24:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E89FF20663 for ; Wed, 15 Jul 2020 01:24:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="QlGUunqm" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728131AbgGOBYX (ORCPT ); Tue, 14 Jul 2020 21:24:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43350 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728122AbgGOBYW (ORCPT ); Tue, 14 Jul 2020 21:24:22 -0400 Received: from mail-pg1-x541.google.com (mail-pg1-x541.google.com [IPv6:2607:f8b0:4864:20::541]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 58322C061755 for ; Tue, 14 Jul 2020 18:24:22 -0700 (PDT) Received: by mail-pg1-x541.google.com with SMTP id t6so883608pgq.1 for ; Tue, 14 Jul 2020 18:24:22 -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=disvEr8QTdkdT/FiP6nWZpfKiZAj+1GxhY8j6L4+VsQ=; b=QlGUunqmMzd7BXyHpekbCEW2V6nSjcB7yoyoPGH4TzD3d5B8mTW/71ZE2cJL8mK51k 71ARRXSzT77AumtXxSrdaGYuwgbX2UQGZA8vfQJjrakWMO6AYGjVROqvp8NejS2m9Z2A 7IYT8IbO38FLfB1a/Y4tOBuCZnK/Z5sSj09mI= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=disvEr8QTdkdT/FiP6nWZpfKiZAj+1GxhY8j6L4+VsQ=; b=qPfI6FLphChRX6xI+v+BxJO6bDUJAxFs2qeZB3mbMFOswyEmt7MGP0BEnaF+IwPllU xY3vMrxdEPljBXaZzyWQ11taYEfgqXQxWAPuCRJoV7b6KtU5LrzjAXlVP2qsKD8U7OGt peWx7sKtBcge3rXoOzhs2GvC/S+PVBEKEyd+5UxcYBtaAi0Z98PFt7j0BFhpwEdzHwC7 tiv4romhiXxTzNPKTBAZPhQ/NZS+i4NM/3/DhYYX0Ayj+qhMCfe2SKqX/cZ7lDrnCvhh k/5CFuep/pk7ScR6p9eTSc+oPT2xOGLkR3/feol7V3TXYjxc8QIPGxkJ4TDKDyjgWrnk rydA== X-Gm-Message-State: AOAM5338Wb4kEIZmfVmR+mmyTvW8YXZMMYQSGeeG1iFq+b57ZGSsGvMB NNjbdRp9nLFE5P6NRDl1IZriuA== X-Google-Smtp-Source: ABdhPJweUW+32ofnpX4MJsObP6q2/5f9TZOLrNQ+l84Tm/hPhwj19hU1a21zbXROqArF2N1b8PwEGw== X-Received: by 2002:a05:6a00:15c8:: with SMTP id o8mr6820199pfu.286.1594776261955; Tue, 14 Jul 2020 18:24:21 -0700 (PDT) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id y19sm335301pfc.135.2020.07.14.18.24.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 14 Jul 2020 18:24:21 -0700 (PDT) Date: Tue, 14 Jul 2020 18:24:20 -0700 From: Kees Cook To: Joerg Roedel Cc: x86@kernel.org, Joerg Roedel , hpa@zytor.com, Andy Lutomirski , Dave Hansen , Peter Zijlstra , Jiri Slaby , Dan Williams , Tom Lendacky , Juergen Gross , David Rientjes , Cfir Cohen , Erdem Aktas , Masami Hiramatsu , Mike Stunes , Sean Christopherson , Martin Radev , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, virtualization@lists.linux-foundation.org Subject: Re: [PATCH v4 16/75] x86/boot/compressed/64: Don't pre-map memory in KASLR code Message-ID: <202007141824.6D5B3BE7@keescook> References: <20200714120917.11253-1-joro@8bytes.org> <20200714120917.11253-17-joro@8bytes.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200714120917.11253-17-joro@8bytes.org> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Tue, Jul 14, 2020 at 02:08:18PM +0200, Joerg Roedel wrote: > From: Joerg Roedel > > With the page-fault handler in place the identity mapping can be built > on-demand. So remove the code which manually creates the mappings and > unexport/remove the functions used for it. > > Signed-off-by: Joerg Roedel Reviewed-by: Kees Cook -- Kees Cook