From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932258AbaGIU0i (ORCPT ); Wed, 9 Jul 2014 16:26:38 -0400 Received: from mga02.intel.com ([134.134.136.20]:61362 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932144AbaGIU0g (ORCPT ); Wed, 9 Jul 2014 16:26:36 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.01,633,1400050800"; d="scan'208";a="541071686" Message-ID: <53BDA568.5030607@intel.com> Date: Wed, 09 Jul 2014 13:26:16 -0700 From: Dave Hansen User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 MIME-Version: 1.0 To: Andrey Ryabinin , linux-kernel@vger.kernel.org CC: Dmitry Vyukov , Konstantin Serebryany , Alexey Preobrazhensky , Andrey Konovalov , Yuri Gribov , Konstantin Khlebnikov , Sasha Levin , Michal Marek , Russell King , Thomas Gleixner , Ingo Molnar , Christoph Lameter , 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. References: <1404905415-9046-1-git-send-email-a.ryabinin@samsung.com> <1404905415-9046-2-git-send-email-a.ryabinin@samsung.com> In-Reply-To: <1404905415-9046-2-git-send-email-a.ryabinin@samsung.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 07/09/2014 04:29 AM, Andrey Ryabinin wrote: > Address sanitizer dedicates 1/8 of the low memory to the shadow memory and uses direct > mapping with a scale and offset to translate a memory address to its corresponding > shadow address. > > Here is function to translate address to corresponding shadow address: > > unsigned long kasan_mem_to_shadow(unsigned long addr) > { > return ((addr - PAGE_OFFSET) >> KASAN_SHADOW_SCALE_SHIFT) > + kasan_shadow_start; > } How does this interact with vmalloc() addresses or those from a kmap()? From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f48.google.com (mail-pa0-f48.google.com [209.85.220.48]) by kanga.kvack.org (Postfix) with ESMTP id F107F6B0035 for ; Wed, 9 Jul 2014 16:26:37 -0400 (EDT) Received: by mail-pa0-f48.google.com with SMTP id et14so9690194pad.7 for ; Wed, 09 Jul 2014 13:26:37 -0700 (PDT) Received: from mga02.intel.com (mga02.intel.com. [134.134.136.20]) by mx.google.com with ESMTP id kc2si46816147pbc.148.2014.07.09.13.26.35 for ; Wed, 09 Jul 2014 13:26:36 -0700 (PDT) Message-ID: <53BDA568.5030607@intel.com> Date: Wed, 09 Jul 2014 13:26:16 -0700 From: Dave Hansen MIME-Version: 1.0 Subject: Re: [RFC/PATCH RESEND -next 01/21] Add kernel address sanitizer infrastructure. References: <1404905415-9046-1-git-send-email-a.ryabinin@samsung.com> <1404905415-9046-2-git-send-email-a.ryabinin@samsung.com> In-Reply-To: <1404905415-9046-2-git-send-email-a.ryabinin@samsung.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Andrey Ryabinin , linux-kernel@vger.kernel.org Cc: Dmitry Vyukov , Konstantin Serebryany , Alexey Preobrazhensky , Andrey Konovalov , Yuri Gribov , Konstantin Khlebnikov , Sasha Levin , Michal Marek , Russell King , Thomas Gleixner , Ingo Molnar , Christoph Lameter , 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 07/09/2014 04:29 AM, Andrey Ryabinin wrote: > Address sanitizer dedicates 1/8 of the low memory to the shadow memory and uses direct > mapping with a scale and offset to translate a memory address to its corresponding > shadow address. > > Here is function to translate address to corresponding shadow address: > > unsigned long kasan_mem_to_shadow(unsigned long addr) > { > return ((addr - PAGE_OFFSET) >> KASAN_SHADOW_SCALE_SHIFT) > + kasan_shadow_start; > } How does this interact with vmalloc() addresses or those from a kmap()? -- 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: dave.hansen@intel.com (Dave Hansen) Date: Wed, 09 Jul 2014 13:26:16 -0700 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: <53BDA568.5030607@intel.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 07/09/2014 04:29 AM, Andrey Ryabinin wrote: > Address sanitizer dedicates 1/8 of the low memory to the shadow memory and uses direct > mapping with a scale and offset to translate a memory address to its corresponding > shadow address. > > Here is function to translate address to corresponding shadow address: > > unsigned long kasan_mem_to_shadow(unsigned long addr) > { > return ((addr - PAGE_OFFSET) >> KASAN_SHADOW_SCALE_SHIFT) > + kasan_shadow_start; > } How does this interact with vmalloc() addresses or those from a kmap()?