From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.kernel.org ([198.145.29.99]:59628 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725839AbeKYCqj (ORCPT ); Sat, 24 Nov 2018 21:46:39 -0500 Date: Sat, 24 Nov 2018 10:57:52 -0500 From: Sasha Levin To: "Kirill A. Shutemov" Cc: gregkh@linuxfoundation.org, luto@kernel.org, tglx@linutronix.de, stable@vger.kernel.org Subject: Re: FAILED: patch "[PATCH] x86/mm: Move LDT remap out of KASLR region on 5-level paging" failed to apply to 4.18-stable tree Message-ID: <20181124155752.GV1917@sasha-vm> References: <154263023165129@kroah.com> <20181123115320.xjodxpilpv7gxzeu@black.fi.intel.com> <20181124155327.GP1917@sasha-vm> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <20181124155327.GP1917@sasha-vm> Sender: stable-owner@vger.kernel.org List-ID: On Sat, Nov 24, 2018 at 10:53:27AM -0500, Sasha Levin wrote: >On Fri, Nov 23, 2018 at 02:53:21PM +0300, Kirill A. Shutemov wrote: >>On Mon, Nov 19, 2018 at 12:23:51PM +0000, gregkh@linuxfoundation.org wrote: >>> >>>The patch below does not apply to the 4.18-stable tree. >>>If someone wants it applied there, or to any other stable or longterm >>>tree, then please email the backport, including the original git commit >>>id to . >> >>>>From b413460931ab36e958ee127522653cd16f7a248c Mon Sep 17 00:00:00 2001 >>From: "Kirill A. Shutemov" >>Date: Fri, 26 Oct 2018 15:28:54 +0300 >>Subject: [PATCH 1/2] x86/mm: Move LDT remap out of KASLR region on 5-level >>paging >> >>commit d52888aa2753e3063a9d3a0c9f72f94aa9809c15 upstream >> >>On 5-level paging the LDT remap area is placed in the middle of the KASLR >>randomization region and it can overlap with the direct mapping, the >>vmalloc or the vmap area. >> >>The LDT mapping is per mm, so it cannot be moved into the P4D page table >>next to the CPU_ENTRY_AREA without complicating PGD table allocation for >>5-level paging. >> >>The 4 PGD slot gap just before the direct mapping is reserved for >>hypervisors, so it cannot be used. >> >>Move the direct mapping one slot deeper and use the resulting gap for the >>LDT remap area. The resulting layout is the same for 4 and 5 level paging. >> >>[ tglx: Massaged changelog ] >> >>Fixes: f55f0501cbf6 ("x86/pti: Put the LDT in its own PGD if PTI is on") >>Signed-off-by: Kirill A. Shutemov >>Signed-off-by: Thomas Gleixner >>Reviewed-by: Andy Lutomirski >>Cc: bp@alien8.de >>Cc: hpa@zytor.com >>Cc: dave.hansen@linux.intel.com >>Cc: peterz@infradead.org >>Cc: boris.ostrovsky@oracle.com >>Cc: jgross@suse.com >>Cc: bhe@redhat.com >>Cc: willy@infradead.org >>Cc: linux-mm@kvack.org >>Cc: stable@vger.kernel.org >>Link: https://lkml.kernel.org/r/20181026122856.66224-2-kirill.shutemov@linux.intel.com > >Queued for 4.18, thank you. ... and right after sending this mail I realized that 4.18 is EOL, so ignore this mail :) -- Thanks, Sasha