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=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 E34FBC3F2D5 for ; Fri, 6 Mar 2020 06:41:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C2B8B2072D for ; Fri, 6 Mar 2020 06:41:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726069AbgCFGl6 (ORCPT ); Fri, 6 Mar 2020 01:41:58 -0500 Received: from szxga04-in.huawei.com ([45.249.212.190]:11597 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725835AbgCFGl6 (ORCPT ); Fri, 6 Mar 2020 01:41:58 -0500 Received: from DGGEMS404-HUB.china.huawei.com (unknown [172.30.72.58]) by Forcepoint Email with ESMTP id 50BDDE1792697A077368; Fri, 6 Mar 2020 14:41:56 +0800 (CST) Received: from huawei.com (10.175.124.28) by DGGEMS404-HUB.china.huawei.com (10.3.19.204) with Microsoft SMTP Server id 14.3.439.0; Fri, 6 Mar 2020 14:41:47 +0800 From: Jason Yan To: , , , , , , , , , CC: , , , Jason Yan Subject: [PATCH v4 0/6] implement KASLR for powerpc/fsl_booke/64 Date: Fri, 6 Mar 2020 14:40:27 +0800 Message-ID: <20200306064033.3398-1-yanaijie@huawei.com> X-Mailer: git-send-email 2.17.2 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.175.124.28] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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&state=* 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. v3->v4: Do not define __kaslr_offset as a fixed symbol. Reference __run_at_load and __kaslr_offset by symbol instead of magic offsets. Use IS_ENABLED(CONFIG_PPC32) instead of #ifdef CONFIG_PPC32. Change kaslr-booke32 to kaslr-booke in index.rst Switch some instructions to 64-bit. v2->v3: Fix build error when KASLR is disabled. 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 Documentation/powerpc/index.rst | 2 +- .../{kaslr-booke32.rst => kaslr-booke.rst} | 35 +++++++- arch/powerpc/Kconfig | 2 +- arch/powerpc/kernel/exceptions-64e.S | 23 +++++ arch/powerpc/kernel/head_64.S | 13 +++ arch/powerpc/kernel/setup_64.c | 3 + arch/powerpc/mm/mmu_decl.h | 23 ++--- arch/powerpc/mm/nohash/kaslr_booke.c | 88 +++++++++++++------ 8 files changed, 144 insertions(+), 45 deletions(-) rename Documentation/powerpc/{kaslr-booke32.rst => kaslr-booke.rst} (59%) -- 2.17.2