From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932308AbaGIO0N (ORCPT ); Wed, 9 Jul 2014 10:26:13 -0400 Received: from qmta09.emeryville.ca.mail.comcast.net ([76.96.30.96]:34084 "EHLO qmta09.emeryville.ca.mail.comcast.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932219AbaGIO0I (ORCPT ); Wed, 9 Jul 2014 10:26:08 -0400 Date: Wed, 9 Jul 2014 09:26:03 -0500 (CDT) From: Christoph Lameter To: Andrey Ryabinin cc: linux-kernel@vger.kernel.org, Dmitry Vyukov , Konstantin Serebryany , Alexey Preobrazhensky , Andrey Konovalov , Yuri Gribov , Konstantin Khlebnikov , Sasha Levin , Michal Marek , Russell King , Thomas Gleixner , Ingo Molnar , Pekka Enberg , David Rientjes , Joonsoo Kim , Andrew Morton , linux-kbuild@vger.kernel.org, linux-arm-kernel@lists.infradead.org, x86@kernel.org, linux-mm@kvack.org Subject: Re: [RFC/PATCH RESEND -next 01/21] Add kernel address sanitizer infrastructure. In-Reply-To: <1404905415-9046-2-git-send-email-a.ryabinin@samsung.com> Message-ID: References: <1404905415-9046-1-git-send-email-a.ryabinin@samsung.com> <1404905415-9046-2-git-send-email-a.ryabinin@samsung.com> Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 9 Jul 2014, Andrey Ryabinin wrote: > + > +Markers of unaccessible bytes could be found in mm/kasan/kasan.h header: > + > +#define KASAN_FREE_PAGE 0xFF /* page was freed */ > +#define KASAN_PAGE_REDZONE 0xFE /* redzone for kmalloc_large allocations */ > +#define KASAN_SLAB_REDZONE 0xFD /* Slab page redzone, does not belong to any slub object */ We call these zones "PADDING". Redzones are associated with an object. Padding is there because bytes are left over, unusable or necessary for alignment. From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qg0-f45.google.com (mail-qg0-f45.google.com [209.85.192.45]) by kanga.kvack.org (Postfix) with ESMTP id CC4B76B0031 for ; Wed, 9 Jul 2014 10:26:09 -0400 (EDT) Received: by mail-qg0-f45.google.com with SMTP id a108so6362501qge.32 for ; Wed, 09 Jul 2014 07:26:09 -0700 (PDT) Received: from qmta10.emeryville.ca.mail.comcast.net (qmta10.emeryville.ca.mail.comcast.net. [2001:558:fe2d:43:76:96:30:17]) by mx.google.com with ESMTP id d1si38007601qcd.28.2014.07.09.07.26.08 for ; Wed, 09 Jul 2014 07:26:08 -0700 (PDT) Date: Wed, 9 Jul 2014 09:26:03 -0500 (CDT) From: Christoph Lameter Subject: Re: [RFC/PATCH RESEND -next 01/21] Add kernel address sanitizer infrastructure. In-Reply-To: <1404905415-9046-2-git-send-email-a.ryabinin@samsung.com> Message-ID: References: <1404905415-9046-1-git-send-email-a.ryabinin@samsung.com> <1404905415-9046-2-git-send-email-a.ryabinin@samsung.com> Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org List-ID: To: Andrey Ryabinin Cc: linux-kernel@vger.kernel.org, Dmitry Vyukov , Konstantin Serebryany , Alexey Preobrazhensky , Andrey Konovalov , Yuri Gribov , Konstantin Khlebnikov , Sasha Levin , Michal Marek , Russell King , Thomas Gleixner , Ingo Molnar , Pekka Enberg , David Rientjes , Joonsoo Kim , Andrew Morton , linux-kbuild@vger.kernel.org, linux-arm-kernel@lists.infradead.org, x86@kernel.org, linux-mm@kvack.org On Wed, 9 Jul 2014, Andrey Ryabinin wrote: > + > +Markers of unaccessible bytes could be found in mm/kasan/kasan.h header: > + > +#define KASAN_FREE_PAGE 0xFF /* page was freed */ > +#define KASAN_PAGE_REDZONE 0xFE /* redzone for kmalloc_large allocations */ > +#define KASAN_SLAB_REDZONE 0xFD /* Slab page redzone, does not belong to any slub object */ We call these zones "PADDING". Redzones are associated with an object. Padding is there because bytes are left over, unusable or necessary for alignment. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org From mboxrd@z Thu Jan 1 00:00:00 1970 From: cl@gentwo.org (Christoph Lameter) Date: Wed, 9 Jul 2014 09:26:03 -0500 (CDT) Subject: [RFC/PATCH RESEND -next 01/21] Add kernel address sanitizer infrastructure. In-Reply-To: <1404905415-9046-2-git-send-email-a.ryabinin@samsung.com> References: <1404905415-9046-1-git-send-email-a.ryabinin@samsung.com> <1404905415-9046-2-git-send-email-a.ryabinin@samsung.com> Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Wed, 9 Jul 2014, Andrey Ryabinin wrote: > + > +Markers of unaccessible bytes could be found in mm/kasan/kasan.h header: > + > +#define KASAN_FREE_PAGE 0xFF /* page was freed */ > +#define KASAN_PAGE_REDZONE 0xFE /* redzone for kmalloc_large allocations */ > +#define KASAN_SLAB_REDZONE 0xFD /* Slab page redzone, does not belong to any slub object */ We call these zones "PADDING". Redzones are associated with an object. Padding is there because bytes are left over, unusable or necessary for alignment.