Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755221AbbGZNpn (ORCPT ); Sun, 26 Jul 2015 09:45:43 -0400 Received: from mail-la0-f43.google.com ([209.85.215.43]:32945 "EHLO mail-la0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755198AbbGZNpl (ORCPT ); Sun, 26 Jul 2015 09:45:41 -0400 Date: Sun, 26 Jul 2015 16:45:19 +0300 From: Vasily Kulikov To: linux-kernel@vger.kernel.org Cc: Randy Dunlap , Andrew Morton , kernel-hardening@lists.openwall.com, Thomas Gleixner , "Kirill A. Shutemov" Subject: [PATCH 2/3] use POISON_POINTER_DELTA for poison pointers Message-ID: <20150726134519.GA1111@cachalot> References: <20150726134324.GA1068@cachalot> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20150726134324.GA1068@cachalot> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1319 Lines: 39 TIMER_ENTRY_STATIC and TAIL_MAPPING are defined as poison pointers which should point to nowhere. Redefine them using POISON_POINTER_DELTA arithmetics to make sure they really point to non-mappable area declared by the target architecture. Signed-off-by: Vasily Kulikov --- include/linux/poison.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/include/linux/poison.h b/include/linux/poison.h index ee697b9..a721bcd 100644 --- a/include/linux/poison.h +++ b/include/linux/poison.h @@ -27,14 +27,14 @@ * Magic number "tsta" to indicate a static timer initializer * for the object debugging code. */ -#define TIMER_ENTRY_STATIC ((void *) 0x74737461) +#define TIMER_ENTRY_STATIC ((void *) 0x300 + POISON_POINTER_DELTA) /********** mm/debug-pagealloc.c **********/ #define PAGE_POISON 0xaa /********** mm/page_alloc.c ************/ -#define TAIL_MAPPING ((void *) 0x01014A11 + POISON_POINTER_DELTA) +#define TAIL_MAPPING ((void *) 0x400 + POISON_POINTER_DELTA) /********** mm/slab.c **********/ /* -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/