Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751681AbcLHH4P (ORCPT ); Thu, 8 Dec 2016 02:56:15 -0500 Received: from mx1.redhat.com ([209.132.183.28]:50752 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750827AbcLHH4N (ORCPT ); Thu, 8 Dec 2016 02:56:13 -0500 From: Baoquan He To: linux-kernel@vger.kernel.org Cc: tglx@linutronix.de, hpa@zytor.com, mingo@redhat.com, x86@kernel.org, keescook@chromium.org, yinghai@kernel.org, bp@suse.de, thgarnie@google.com, kuleshovmail@gmail.com, luto@kernel.org, anderson@redhat.com, dyoung@redhat.com, xlpang@redhat.com, Baoquan He Subject: [PATCH 0/2] Determine kernel text mapping size at runtime for x86_64 Date: Thu, 8 Dec 2016 15:56:03 +0800 Message-Id: <1481183765-4166-1-git-send-email-bhe@redhat.com> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.25]); Thu, 08 Dec 2016 07:56:13 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1294 Lines: 28 Dave Anderson ever told in Crash utility he makes judgement whether it's a kaslr kernel by size of KERNEL_IMAGE_SIZE. As long as it's 1G, it's recognized as kaslr. Then the current upstream kernel has a wrong behaviour, it sets KERNEL_IMAGE_SIZE as 1G as long as CONFIG_RANDOMIZE_BASE is enabled, though people specify "nokaslr" into cmdline to disable kaslr explicitly. So in this patchset, made changes to determine the size of kernel text mapping area at runtime. If "nokaslr" specified, kernel mapping size is 512M though CONFIG_RANDOMIZE_BASE is enabled. Baoquan He (2): x86/64: Make kernel text mapping always take one whole page table in early boot code x86/KASLR/64: Determine kernel text mapping size at runtime arch/x86/boot/compressed/kaslr.c | 15 ++++++++++----- arch/x86/include/asm/kaslr.h | 1 + arch/x86/include/asm/page_64_types.h | 20 ++++++++++++-------- arch/x86/include/asm/pgtable_64_types.h | 2 +- arch/x86/kernel/head64.c | 11 ++++++----- arch/x86/kernel/head_64.S | 16 +++++++++------- arch/x86/mm/dump_pagetables.c | 3 ++- arch/x86/mm/init_64.c | 2 +- arch/x86/mm/physaddr.c | 6 +++--- 9 files changed, 45 insertions(+), 31 deletions(-) -- 2.5.5