From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752014AbdGPOxn (ORCPT ); Sun, 16 Jul 2017 10:53:43 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:43210 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751417AbdGPN5e (ORCPT ); Sun, 16 Jul 2017 09:57:34 -0400 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, "H. Peter Anvin" , yinghai@kernel.org, "T Makphaibulchoke" , dhowells@redhat.com, tiwai@suse.de, "Ingo Molnar" Date: Sun, 16 Jul 2017 14:56:38 +0100 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [PATCH 3.2 89/95] x86/mm/init.c: Fix devmem_is_allowed() off by one In-Reply-To: X-SA-Exim-Connect-IP: 2a02:8011:400e:2:6f00:88c8:c921:d332 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.2.91-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: T Makphaibulchoke commit 73e8f3d7e2cb23614d5115703d76d8e54764b641 upstream. Fixing an off-by-one error in devmem_is_allowed(), which allows accesses to physical addresses 0x100000-0x100fff, an extra page past 1MB. Signed-off-by: T Makphaibulchoke Acked-by: H. Peter Anvin Cc: yinghai@kernel.org Cc: tiwai@suse.de Cc: dhowells@redhat.com Link: http://lkml.kernel.org/r/1346210503-14276-1-git-send-email-tmac@hp.com Signed-off-by: Ingo Molnar Signed-off-by: Ben Hutchings --- arch/x86/mm/init.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/x86/mm/init.c +++ b/arch/x86/mm/init.c @@ -326,7 +326,7 @@ unsigned long __init_refok init_memory_m */ int devmem_is_allowed(unsigned long pagenr) { - if (pagenr <= 256) + if (pagenr < 256) return 1; if (iomem_is_exclusive(pagenr << PAGE_SHIFT)) return 0;