From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E899EC433DF for ; Tue, 9 Jun 2020 00:00:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BBA5120801 for ; Tue, 9 Jun 2020 00:00:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=wdc.com header.i=@wdc.com header.b="du+aQSTi"; dkim=pass (1024-bit key) header.d=sharedspace.onmicrosoft.com header.i=@sharedspace.onmicrosoft.com header.b="oFbE4iD4" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728005AbgFIAAl (ORCPT ); Mon, 8 Jun 2020 20:00:41 -0400 Received: from esa6.hgst.iphmx.com ([216.71.154.45]:33775 "EHLO esa6.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731752AbgFIAAf (ORCPT ); Mon, 8 Jun 2020 20:00:35 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1591660836; x=1623196836; h=from:to:cc:subject:date:message-id:references: content-transfer-encoding:mime-version; bh=ERtaMgP1oo0S2OBx/YSiH65PxBFkpsSszpmiv1Ps0as=; b=du+aQSTiSTC+r0OfaNWn5CYIa4m43SU+pqtMLH7/dDgAi7MXeP29Ropi yT3YsA/h/ubHYKJO7BZhSvQtlvdkQypBvq8yZZr3xTdofxsNZW3AgruOM asbkQPkrgUzcKuqqfc8iIxoBlxajamgPtnaDxrMJgppVf0z5l7q0hRDyJ Wsgi+tFcDJ7MrFrUXv14smt+9MrKB6helorukCm502Qzcm5oFFuQOb3/j 8cjbEdJ1df3yCzeTs4fveVAcNE/ZAYnvjmjc58N6eGi9AzXuP6ujYcwKj 62B8ATDmjjzavZxWtzlUNDGbNcroXsbFqN20qxfWVQumrKT6rNUlqUV3f Q==; IronPort-SDR: 3Mr/7pmvvkU2zyAfsEhjo8WTlR+ucCIP8HuvFBzzgcZ4eY4dq60VLvEoL0BIC2Ziyw/K1wL4rB t48Jko5Z/5kuIxk2E9llJi2wVizGifpqQu70TERg76sb+rsoYaw2Pf+z/uI9Nsu8Hu+DPlfFtO J2cW7BeC7QOPqY7+TEKbOXkGvZjnZ7tLlp7JXnU6V5U/RHuX68qtjoAf/YKQn90SIVD9+5IcgA ebecBVN+3zZHmN3yK3ZIB7dD5syFWaTlNWqGaUE5TYqzjAiExqjCRyOQEWdpW3BFaad+X53PAZ rcU= X-IronPort-AV: E=Sophos;i="5.73,489,1583164800"; d="scan'208";a="140910882" Received: from mail-co1nam04lp2056.outbound.protection.outlook.com (HELO NAM04-CO1-obe.outbound.protection.outlook.com) ([104.47.45.56]) by ob1.hgst.iphmx.com with ESMTP; 09 Jun 2020 08:00:35 +0800 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=PPDw0Y61UHCTQn17SkzL7OEUH1MpPAJ34+nd4X715j98F/1CxZlss0xCcAaHK2o67rLqJoATQgpr2yzN5ygXk9Wmsk1eWfEb49++XnCqv4MBfmpfCILZzRV5HXELqAfHaoOg1JfwmepbGEYzPFBAE77cl826Vcz7BZnsAm5FCGy7EpSiqv0ZZf98deKiVnyZidxhXvPVAiriDaTb7sj4ANOw2f0mqkJURXzx9SXBcA0JDIeYLX5uVbEy12JzRkiAZ/Q6pdBs2eSQ4kbM0gdQPkL5vcA1kXJ2tLWNsRsb74vvUk3u5bve9ad2+aIXRZd6veCuDayH3HFH4Yh1bx70AA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=M5ARtJoUQrvtk9ADRPYCWLcpdsjPIXaQeezWZHDxsy4=; b=JolRU/vs8RNElR/JYf8Kqsjs+peRAbOo5bLnEmsq5YG5GdtqyZlgWhEpP+4MvtBs5rmzbpWt+0YQI7FHcyLXMZPPntaz8kisB7juMbNrb3HluaZgMZ7lJj+gEwtYsZkVjfqtGaoZVRt2bjIrT0fz4+R7iTZlpXTPWL1Fi9YHUKxnkcOeOqVZdS68o1mXbboc+qsLodEC2Vps5BY9+chvVC8eHJ5n/nqxl9h3b+IN82UPr47yjcbQfhLNjfRmK1+7iTBgKqC5priJT6eKrGoAjTHcH+tQWaV4Bbm97lozft2wCKDEPMXfcYOxEQWtg8oxTqx3YoGna1eGGY0nCG+bbw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=wdc.com; dmarc=pass action=none header.from=wdc.com; dkim=pass header.d=wdc.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sharedspace.onmicrosoft.com; s=selector2-sharedspace-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=M5ARtJoUQrvtk9ADRPYCWLcpdsjPIXaQeezWZHDxsy4=; b=oFbE4iD4Ntx56U8IR1avzhDWWqlt9btB6NGIgCWt9ul63SjA2hzFKe/J8LsLtN6N6jhJJKUI/bd5VTksfGNnUuqDt1QBfQWQGPJt58GBLOrWK3hZj+l06hOpkEbTx+IqhqQxQdu6FfW85JfpVBpOX1quyeWeAVhyOUJHskB2W7M= Received: from BYAPR04MB4965.namprd04.prod.outlook.com (2603:10b6:a03:4d::25) by BYAPR04MB4518.namprd04.prod.outlook.com (2603:10b6:a03:5b::27) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3066.18; Tue, 9 Jun 2020 00:00:32 +0000 Received: from BYAPR04MB4965.namprd04.prod.outlook.com ([fe80::4d72:27c:c075:c5e6]) by BYAPR04MB4965.namprd04.prod.outlook.com ([fe80::4d72:27c:c075:c5e6%7]) with mapi id 15.20.3066.023; Tue, 9 Jun 2020 00:00:32 +0000 From: Chaitanya Kulkarni To: harshad shirwadkar CC: Bart Van Assche , "linux-block@vger.kernel.org" Subject: Re: [PATCH] blktrace: put bounds on BLKTRACESETUP buf_size and buf_nr Thread-Topic: [PATCH] blktrace: put bounds on BLKTRACESETUP buf_size and buf_nr Thread-Index: AQHWOjNJLSEx3mlm6Eunc+X8pDtzsQ== Date: Tue, 9 Jun 2020 00:00:32 +0000 Message-ID: References: <20200604054434.216698-1-harshadshirwadkar@gmail.com> <49a4c410-6d42-46b3-adde-1d0a8fc6b594@acm.org> <8787ab94-4573-56d4-2e59-0adbaa979c4f@acm.org> <35a5f5a7-770e-1cbe-10a3-118591b64f29@acm.org> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: gmail.com; dkim=none (message not signed) header.d=none;gmail.com; dmarc=none action=none header.from=wdc.com; x-originating-ip: [199.255.45.62] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 9846e00e-70ce-4c8b-166f-08d80c0820f8 x-ms-traffictypediagnostic: BYAPR04MB4518: x-microsoft-antispam-prvs: wdcipoutbound: EOP-TRUE x-ms-oob-tlc-oobclassifiers: OLM:8882; x-forefront-prvs: 042957ACD7 x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: ed3lyNWxEuC02O5p2q7x0Glrg4kAW502wwzYaCkma5D1H7GEFyRASmxv3ZdIAaPwPlOWXSuockxEGvORbdkvpsRXPeICFANJ1puqGgKJh0p1ghTGLgKFLFy3YuVR71gK8RFbOjXN4UyNRddRnDIhgE7qlHCLlOZvBWadOkaRJ1FAZZrqkOcbDtQDfawwnPyuG/r9NufEuR7W1UeiC14C7VQj1DE/LOGOU94nstyqOH3BzltzH6P0fD3pTVpK1WSaZrCLu1l/6cefrs+KKO0uEh7H6fGX8s7bdOuioOb8oNW7zbsjz/6iPLgcPYrrO8oKyEnCO62ziLcIA/+vZoAwJA== x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:BYAPR04MB4965.namprd04.prod.outlook.com;PTR:;CAT:NONE;SFTY:;SFS:(4636009)(366004)(346002)(396003)(39860400002)(376002)(136003)(71200400001)(54906003)(2906002)(316002)(26005)(6506007)(5660300002)(186003)(55016002)(76116006)(6916009)(9686003)(64756008)(66446008)(66946007)(53546011)(66556008)(66476007)(52536014)(7696005)(8676002)(33656002)(478600001)(4326008)(4744005)(86362001)(83380400001)(8936002);DIR:OUT;SFP:1102; x-ms-exchange-antispam-messagedata: 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 x-ms-exchange-transport-forked: True Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-Network-Message-Id: 9846e00e-70ce-4c8b-166f-08d80c0820f8 X-MS-Exchange-CrossTenant-originalarrivaltime: 09 Jun 2020 00:00:32.4426 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 0Jet3cX0IPCxVMuY/qkMO80l81As+SWiA/wuFShXN7sBiPW9+CO7OVinLAj6jh+g/o4hNQbvh2vMNffj1kgncicP3/r6VH2aFde0akODCJo= X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR04MB4518 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org On 6/8/20 4:40 PM, harshad shirwadkar wrote:=0A= > From what I understand, there's no alternative to having a fix in the=0A= > kernel. That's because, if the kernel is not fixed and only the=0A= > commonly used user-space apps are fixed, I can always write a new=0A= > program to break the kernel. So, as mentioned above, maybe we can make=0A= > these limits configurable via sysfs but we'll need these bound checks=0A= > in the kernel.=0A= =0A= Okay, thanks for the explanation.=0A=