From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:50920 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932224AbbLGMRZ (ORCPT ); Mon, 7 Dec 2015 07:17:25 -0500 Subject: Patch "x86/setup: Fix low identity map for >= 2GB kernel range" has been added to the 4.2-stable tree To: krzysiek@podlesie.net, bp@alien8.de, gregkh@linuxfoundation.org, lersek@redhat.com, luto@amacapital.net, matt.fleming@intel.com, pbonzini@redhat.com, tglx@linutronix.de Cc: , From: Date: Mon, 07 Dec 2015 00:15:34 -0800 Message-ID: <144947613411933@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled x86/setup: Fix low identity map for >= 2GB kernel range to the 4.2-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: x86-setup-fix-low-identity-map-for-2gb-kernel-range.patch and it can be found in the queue-4.2 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From 68accac392d859d24adcf1be3a90e41f978bd54c Mon Sep 17 00:00:00 2001 From: Krzysztof Mazur Date: Fri, 6 Nov 2015 14:18:36 +0100 Subject: x86/setup: Fix low identity map for >= 2GB kernel range From: Krzysztof Mazur commit 68accac392d859d24adcf1be3a90e41f978bd54c upstream. The commit f5f3497cad8c extended the low identity mapping. However, if the kernel uses more than 2 GB (VMSPLIT_2G_OPT or VMSPLIT_1G memory split), the normal memory mapping is overwritten by the low identity mapping causing a crash. To avoid overwritting, limit the low identity map to cover only memory before kernel range (PAGE_OFFSET). Fixes: f5f3497cad8c "x86/setup: Extend low identity map to cover whole kernel range Signed-off-by: Krzysztof Mazur Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Laszlo Ersek Cc: Matt Fleming Cc: Paolo Bonzini Link: http://lkml.kernel.org/r/1446815916-22105-1-git-send-email-krzysiek@podlesie.net Signed-off-by: Thomas Gleixner Signed-off-by: Greg Kroah-Hartman --- arch/x86/kernel/setup.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/x86/kernel/setup.c +++ b/arch/x86/kernel/setup.c @@ -1205,7 +1205,7 @@ void __init setup_arch(char **cmdline_p) */ clone_pgd_range(initial_page_table, swapper_pg_dir + KERNEL_PGD_BOUNDARY, - KERNEL_PGD_PTRS); + min(KERNEL_PGD_PTRS, KERNEL_PGD_BOUNDARY)); #endif tboot_probe(); Patches currently in stable-queue which might be from krzysiek@podlesie.net are queue-4.2/x86-setup-fix-low-identity-map-for-2gb-kernel-range.patch