From patchwork Wed Feb 5 02:55:21 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Yan X-Patchwork-Id: 1233653 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 48C6CG4LS0z9sRK for ; Wed, 5 Feb 2020 14:15:54 +1100 (AEDT) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=huawei.com Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 48C6CG1y1NzDqGp for ; Wed, 5 Feb 2020 14:15:54 +1100 (AEDT) X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=huawei.com (client-ip=45.249.212.191; helo=huawei.com; envelope-from=yanaijie@huawei.com; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=huawei.com Received: from huawei.com (szxga05-in.huawei.com [45.249.212.191]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 48C67G3qKQzDq7j for ; Wed, 5 Feb 2020 14:12:22 +1100 (AEDT) Received: from DGGEMS406-HUB.china.huawei.com (unknown [172.30.72.58]) by Forcepoint Email with ESMTP id A0E227E85F07CB2E5BCB; Wed, 5 Feb 2020 10:56:36 +0800 (CST) Received: from huawei.com (10.175.124.28) by DGGEMS406-HUB.china.huawei.com (10.3.19.206) with Microsoft SMTP Server id 14.3.439.0; Wed, 5 Feb 2020 10:56:26 +0800 From: Jason Yan To: , , , , , , , , , Subject: [PATCH v2 0/6] implement KASLR for powerpc/fsl_booke/64 Date: Wed, 5 Feb 2020 10:55:21 +0800 Message-ID: <20200205025527.28640-1-yanaijie@huawei.com> X-Mailer: git-send-email 2.17.2 MIME-Version: 1.0 X-Originating-IP: [10.175.124.28] X-CFilter-Loop: Reflected X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jason Yan , linux-kernel@vger.kernel.org, zhaohongjiang@huawei.com Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" This is a try to implement KASLR for Freescale BookE64 which is based on my earlier implementation for Freescale BookE32: https://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=131718 The implementation for Freescale BookE64 is similar as BookE32. One difference is that Freescale BookE64 set up a TLB mapping of 1G during booting. Another difference is that ppc64 needs the kernel to be 64K-aligned. So we can randomize the kernel in this 1G mapping and make it 64K-aligned. This can save some code to creat another TLB map at early boot. The disadvantage is that we only have about 1G/64K = 16384 slots to put the kernel in. KERNELBASE 64K |--> kernel <--| | | | +--+--+--+ +--+--+--+--+--+--+--+--+--+ +--+--+ | | | |....| | | | | | | | | |....| | | +--+--+--+ +--+--+--+--+--+--+--+--+--+ +--+--+ | | 1G |-----> offset <-----| kernstart_virt_addr I'm not sure if the slot numbers is enough or the design has any defects. If you have some better ideas, I would be happy to hear that. Thank you all. v1->v2: Add __kaslr_offset for the secondary cpu boot up. Jason Yan (6): powerpc/fsl_booke/kaslr: refactor kaslr_legal_offset() and kaslr_early_init() powerpc/fsl_booke/64: introduce reloc_kernel_entry() helper powerpc/fsl_booke/64: implement KASLR for fsl_booke64 powerpc/fsl_booke/64: do not clear the BSS for the second pass powerpc/fsl_booke/64: clear the original kernel if randomized powerpc/fsl_booke/kaslr: rename kaslr-booke32.rst to kaslr-booke.rst and add 64bit part .../{kaslr-booke32.rst => kaslr-booke.rst} | 35 +++++++-- arch/powerpc/Kconfig | 2 +- arch/powerpc/kernel/exceptions-64e.S | 21 ++++++ arch/powerpc/kernel/head_64.S | 14 ++++ arch/powerpc/kernel/setup_64.c | 4 +- arch/powerpc/mm/mmu_decl.h | 3 +- arch/powerpc/mm/nohash/kaslr_booke.c | 71 +++++++++++++------ 7 files changed, 122 insertions(+), 28 deletions(-) rename Documentation/powerpc/{kaslr-booke32.rst => kaslr-booke.rst} (59%)