From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752623AbdFAQWq (ORCPT ); Thu, 1 Jun 2017 12:22:46 -0400 Received: from mail-eopbgr50126.outbound.protection.outlook.com ([40.107.5.126]:22720 "EHLO EUR03-VE1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752590AbdFAQWm (ORCPT ); Thu, 1 Jun 2017 12:22:42 -0400 Authentication-Results: linux-foundation.org; dkim=none (message not signed) header.d=none;linux-foundation.org; dmarc=none action=none header.from=virtuozzo.com; From: Andrey Ryabinin To: Andrew Morton CC: Alexander Potapenko , Dmitry Vyukov , , , , Andrey Ryabinin , Catalin Marinas , Will Deacon , Subject: [PATCH 3/4] arm64/kasan: don't allocate extra shadow memory Date: Thu, 1 Jun 2017 19:23:37 +0300 Message-ID: <20170601162338.23540-3-aryabinin@virtuozzo.com> X-Mailer: git-send-email 2.13.0 In-Reply-To: <20170601162338.23540-1-aryabinin@virtuozzo.com> References: <20170601162338.23540-1-aryabinin@virtuozzo.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [195.214.232.6] X-ClientProxiedBy: VI1P190CA0007.EURP190.PROD.OUTLOOK.COM (10.165.188.148) To DB5PR0801MB2727.eurprd08.prod.outlook.com (10.166.176.23) X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DB5PR0801MB2727: X-MS-Office365-Filtering-Correlation-Id: eb792ed4-51b9-4d93-6fe2-08d4a90a6169 X-Microsoft-Antispam: UriScan:;BCL:0;PCL:0;RULEID:(22001)(201703131423075)(201703031133081);SRVR:DB5PR0801MB2727; 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Therefore additional shadow memory mapped to prevent crash if speculative load would happen near the end of the mapped shadow memory. Now we don't have such speculative loads, so we no longer need to map additional shadow memory. Signed-off-by: Andrey Ryabinin Cc: Catalin Marinas Cc: Will Deacon Cc: linux-arm-kernel@lists.infradead.org --- arch/arm64/mm/kasan_init.c | 8 +------- 1 file changed, 1 insertion(+), 7 deletions(-) diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c index 687a358a3733..81f03959a4ab 100644 --- a/arch/arm64/mm/kasan_init.c +++ b/arch/arm64/mm/kasan_init.c @@ -191,14 +191,8 @@ void __init kasan_init(void) if (start >= end) break; - /* - * end + 1 here is intentional. We check several shadow bytes in - * advance to slightly speed up fastpath. In some rare cases - * we could cross boundary of mapped shadow, so we just map - * some more here. - */ vmemmap_populate((unsigned long)kasan_mem_to_shadow(start), - (unsigned long)kasan_mem_to_shadow(end) + 1, + (unsigned long)kasan_mem_to_shadow(end), pfn_to_nid(virt_to_pfn(start))); } -- 2.13.0 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-oi0-f69.google.com (mail-oi0-f69.google.com [209.85.218.69]) by kanga.kvack.org (Postfix) with ESMTP id 9FCE76B02F3 for ; Thu, 1 Jun 2017 12:22:23 -0400 (EDT) Received: by mail-oi0-f69.google.com with SMTP id c71so51390936oig.1 for ; Thu, 01 Jun 2017 09:22:23 -0700 (PDT) Received: from EUR03-VE1-obe.outbound.protection.outlook.com (mail-eopbgr50099.outbound.protection.outlook.com. [40.107.5.99]) by mx.google.com with ESMTPS id o13si4331210oto.26.2017.06.01.09.22.22 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 01 Jun 2017 09:22:22 -0700 (PDT) From: Andrey Ryabinin Subject: [PATCH 3/4] arm64/kasan: don't allocate extra shadow memory Date: Thu, 1 Jun 2017 19:23:37 +0300 Message-ID: <20170601162338.23540-3-aryabinin@virtuozzo.com> In-Reply-To: <20170601162338.23540-1-aryabinin@virtuozzo.com> References: <20170601162338.23540-1-aryabinin@virtuozzo.com> MIME-Version: 1.0 Content-Type: text/plain Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton Cc: Alexander Potapenko , Dmitry Vyukov , kasan-dev@googlegroups.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrey Ryabinin , Catalin Marinas , Will Deacon , linux-arm-kernel@lists.infradead.org We used to read several bytes of the shadow memory in advance. Therefore additional shadow memory mapped to prevent crash if speculative load would happen near the end of the mapped shadow memory. Now we don't have such speculative loads, so we no longer need to map additional shadow memory. Signed-off-by: Andrey Ryabinin Cc: Catalin Marinas Cc: Will Deacon Cc: linux-arm-kernel@lists.infradead.org --- arch/arm64/mm/kasan_init.c | 8 +------- 1 file changed, 1 insertion(+), 7 deletions(-) diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c index 687a358a3733..81f03959a4ab 100644 --- a/arch/arm64/mm/kasan_init.c +++ b/arch/arm64/mm/kasan_init.c @@ -191,14 +191,8 @@ void __init kasan_init(void) if (start >= end) break; - /* - * end + 1 here is intentional. We check several shadow bytes in - * advance to slightly speed up fastpath. In some rare cases - * we could cross boundary of mapped shadow, so we just map - * some more here. - */ vmemmap_populate((unsigned long)kasan_mem_to_shadow(start), - (unsigned long)kasan_mem_to_shadow(end) + 1, + (unsigned long)kasan_mem_to_shadow(end), pfn_to_nid(virt_to_pfn(start))); } -- 2.13.0 -- 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: aryabinin@virtuozzo.com (Andrey Ryabinin) Date: Thu, 1 Jun 2017 19:23:37 +0300 Subject: [PATCH 3/4] arm64/kasan: don't allocate extra shadow memory In-Reply-To: <20170601162338.23540-1-aryabinin@virtuozzo.com> References: <20170601162338.23540-1-aryabinin@virtuozzo.com> Message-ID: <20170601162338.23540-3-aryabinin@virtuozzo.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org We used to read several bytes of the shadow memory in advance. Therefore additional shadow memory mapped to prevent crash if speculative load would happen near the end of the mapped shadow memory. Now we don't have such speculative loads, so we no longer need to map additional shadow memory. Signed-off-by: Andrey Ryabinin Cc: Catalin Marinas Cc: Will Deacon Cc: linux-arm-kernel at lists.infradead.org --- arch/arm64/mm/kasan_init.c | 8 +------- 1 file changed, 1 insertion(+), 7 deletions(-) diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c index 687a358a3733..81f03959a4ab 100644 --- a/arch/arm64/mm/kasan_init.c +++ b/arch/arm64/mm/kasan_init.c @@ -191,14 +191,8 @@ void __init kasan_init(void) if (start >= end) break; - /* - * end + 1 here is intentional. We check several shadow bytes in - * advance to slightly speed up fastpath. In some rare cases - * we could cross boundary of mapped shadow, so we just map - * some more here. - */ vmemmap_populate((unsigned long)kasan_mem_to_shadow(start), - (unsigned long)kasan_mem_to_shadow(end) + 1, + (unsigned long)kasan_mem_to_shadow(end), pfn_to_nid(virt_to_pfn(start))); } -- 2.13.0