Received: by 2002:a25:ad19:0:0:0:0:0 with SMTP id y25csp557741ybi; Fri, 26 Jul 2019 14:47:02 -0700 (PDT) X-Google-Smtp-Source: APXvYqzFXQVcI2JdDhAmcnpG+M6wdf/g7aYNs9Y9iYypk7241tVj4CDBa7C/dg/Ph2nf0PfLcK+A X-Received: by 2002:a63:ea50:: with SMTP id l16mr94849289pgk.160.1564177622022; Fri, 26 Jul 2019 14:47:02 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1564177622; cv=none; d=google.com; s=arc-20160816; b=CXNujeItg4XTsAX5zYFbX7McumYF+aMreileE/EDnGfc6x0B3odmYMjw3BMy4uCRIi sFrcbZEOU4/OPX2EihoNN7+jiWNsxlRz+iKnUm5J2TuNJm1Fgyc7Qqk5H0f5M2pBMG9x LyvOucbTJ+NsKDXe7ZGT9yMY4FHV+yuqBe339c9A5czvXkOEKC+871WnQ4WxAhz7j3Tp Tv6Eb5d7fmSaugeiFjQyvXnYOyLhLo4xiQoYTqSLO4QWZOgwhJnt9blBYXNVBrMpSAf9 tBhlcQRJS1BcplxMlYtpXVB3yzWxP4nRY3q0ye6b++dOJ1vQyEuVNZrbFhYh1IZ4lTzl i0bg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:in-reply-to:content-disposition :mime-version:references:message-id:subject:cc:to:from:date :dkim-signature; bh=9pxdI8Q1eQGc6MFJDXbX8IPKQf5e9FjRtdij/Ccdk+g=; b=SCNC3xEOTQh/k/A61CVH/KLhkY6pzeQj9YYBTk4mdpSijAyaj7NtV1AOdKDH42cawm BsaHyrCZHsrQyZMoD12aoihc2ogymDe5l+pK61TJ/GnzvG+a1CYbjxtUlg2hWXzrYuWk 1rPRlJ3Avi/IX9n20HmkQvsgPmqHq1WBwynOV4QTRg0bX8xZm76vT7yDQcHkhzPpMkJB 5zXbWEyoOyGO+FOhVZptcgqFysUVt5f6NjXd35Rye1bw3ASm5aC6Ce2O/v6s7xHBQ9RE uQNYUXVTKqgmh/F8DtUae8LuqZLvn6Ow5Tr+v8vuJZli2a85Uu0r0O6HPZnYiQBREEOQ Fd6g== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@chromium.org header.s=google header.b=GhJtb6y3; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=chromium.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id g17si18424814plo.406.2019.07.26.14.46.45; Fri, 26 Jul 2019 14:47:02 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@chromium.org header.s=google header.b=GhJtb6y3; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=chromium.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726952AbfGZQQA (ORCPT + 99 others); Fri, 26 Jul 2019 12:16:00 -0400 Received: from mail-pg1-f193.google.com ([209.85.215.193]:35200 "EHLO mail-pg1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726143AbfGZQP7 (ORCPT ); Fri, 26 Jul 2019 12:15:59 -0400 Received: by mail-pg1-f193.google.com with SMTP id s1so18698605pgr.2 for ; Fri, 26 Jul 2019 09:15:59 -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=9pxdI8Q1eQGc6MFJDXbX8IPKQf5e9FjRtdij/Ccdk+g=; b=GhJtb6y3IvR2euTrzUQLBPzuWpMC1r078nOKLTS2B26A9HymM6QBFZfT03uDUsxGMt qEU5Dj5ZPRoFY2MiQMolT8V6egN2ZpXNx0R/y1ExRSFTnrcIQQkTlH+qisWgVrr+fhu5 fwWtJB/yQ5JNCDew1FsG+XjvLgH1fzf99fEmQ= 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=9pxdI8Q1eQGc6MFJDXbX8IPKQf5e9FjRtdij/Ccdk+g=; b=peRftu/kLmlNqJpDGeVUdqSB7GqXw/3DaG7RwA8vpVTwodrLdcnmRGOIDZRStqHdJ7 7VXUREj96bPedxCW2fUt7QaVVeVh5O1olhKo+IGC0reqfGaRPOrvL9lMMEwIYbCYlFJV nMEv5Nhwl0G7A/qUNisyhjTT2SgpE507ExSnvgLrIr7u0tELaD0FhF7Q7ZXPv2Lsysyt oPii6+ycDFsYR4zF2/q7HA04eMGdco2yxDam4IUMPYFwH8vcS7U7hLjT5RhEyyLKicOT vUvI19CpKPeFegkids2HewqDIaBFbh6ucVNsVo9ZRsv+HlA+qihRiNAM+hKrXSs6pgds mRDQ== X-Gm-Message-State: APjAAAVhsxvz/5rDT2o1oA4DRgNqGhb7n3BnwIB0eoHzzpMaoBuqNoF/ 5t1pHtCwDhrqRxu5V96GpGbalA== X-Received: by 2002:a62:5344:: with SMTP id h65mr23349574pfb.32.1564157758990; Fri, 26 Jul 2019 09:15:58 -0700 (PDT) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id i126sm61479400pfb.32.2019.07.26.09.15.57 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 26 Jul 2019 09:15:58 -0700 (PDT) Date: Fri, 26 Jul 2019 09:15:57 -0700 From: Kees Cook To: Jason Yan Cc: mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org, diana.craciun@nxp.com, christophe.leroy@c-s.fr, benh@kernel.crashing.org, paulus@samba.org, npiggin@gmail.com, kernel-hardening@lists.openwall.com, linux-kernel@vger.kernel.org, wangkefeng.wang@huawei.com, yebin10@huawei.com, thunder.leizhen@huawei.com, jingxiangfeng@huawei.com, fanchengyang@huawei.com Subject: Re: [RFC PATCH 00/10] implement KASLR for powerpc/fsl_booke/32 Message-ID: <201907260914.E37F9B041@keescook> References: <20190717080621.40424-1-yanaijie@huawei.com> <201907251252.0C58037@keescook> <877d818d-b3ec-1cea-d024-4ad6aea7af60@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <877d818d-b3ec-1cea-d024-4ad6aea7af60@huawei.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jul 26, 2019 at 03:20:26PM +0800, Jason Yan wrote: > The boot code only maps one 64M zone at early start. If the kernel crosses > two 64M zones, we need to map two 64M zones. Keep the kernel in one 64M > saves a lot of complex codes. Ah-ha. Gotcha. Thanks for the clarification. > Yes, if this feature can be accepted, I will start to work with powerpc64 > KASLR and other things like CONFIG_RANDOMIZE_MEMORY. Awesome. :) -- Kees Cook