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=-3.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED 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 1DE3BC61DD8 for ; Fri, 23 Oct 2020 13:29:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B6A8020EDD for ; Fri, 23 Oct 2020 13:29:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S369051AbgJWN3D (ORCPT ); Fri, 23 Oct 2020 09:29:03 -0400 Received: from eu-smtp-delivery-151.mimecast.com ([185.58.86.151]:32353 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S464780AbgJWN3C (ORCPT ); Fri, 23 Oct 2020 09:29:02 -0400 Received: from AcuMS.aculab.com (156.67.243.126 [156.67.243.126]) (Using TLS) by relay.mimecast.com with ESMTP id uk-mtapsc-1-v1vYoM8jOeGMKLhWfd8r_g-1; Fri, 23 Oct 2020 14:28:58 +0100 X-MC-Unique: v1vYoM8jOeGMKLhWfd8r_g-1 Received: from AcuMS.Aculab.com (fd9f:af1c:a25b:0:43c:695e:880f:8750) by AcuMS.aculab.com (fd9f:af1c:a25b:0:43c:695e:880f:8750) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Fri, 23 Oct 2020 14:28:57 +0100 Received: from AcuMS.Aculab.com ([fe80::43c:695e:880f:8750]) by AcuMS.aculab.com ([fe80::43c:695e:880f:8750%12]) with mapi id 15.00.1347.000; Fri, 23 Oct 2020 14:28:57 +0100 From: David Laight To: 'Arnd Bergmann' CC: Greg KH , David Hildenbrand , Al Viro , Nick Desaulniers , Christoph Hellwig , "kernel-team@android.com" , Andrew Morton , Jens Axboe , David Howells , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "linux-mips@vger.kernel.org" , "linux-parisc@vger.kernel.org" , "linuxppc-dev@lists.ozlabs.org" , "linux-s390@vger.kernel.org" , "sparclinux@vger.kernel.org" , "linux-block@vger.kernel.org" , "linux-scsi@vger.kernel.org" , "linux-fsdevel@vger.kernel.org" , "linux-aio@kvack.org" , "io-uring@vger.kernel.org" , "linux-arch@vger.kernel.org" , "linux-mm@kvack.org" , "netdev@vger.kernel.org" , "keyrings@vger.kernel.org" , "linux-security-module@vger.kernel.org" Subject: RE: Buggy commit tracked to: "Re: [PATCH 2/9] iov_iter: move rw_copy_check_uvector() into lib/iov_iter.c" Thread-Topic: Buggy commit tracked to: "Re: [PATCH 2/9] iov_iter: move rw_copy_check_uvector() into lib/iov_iter.c" Thread-Index: AQHWqE5GNDfnH4y9nkGWtfqJueR1KKmjTCJQgAAN4UiAAAD2IIAASOeCgAF+12D///tDgIAAEbpg Date: Fri, 23 Oct 2020 13:28:57 +0000 Message-ID: <8e758668cffa4713969df33299180c64@AcuMS.aculab.com> References: <20201022090155.GA1483166@kroah.com> <5fd6003b-55a6-2c3c-9a28-8fd3a575ca78@redhat.com> <20201022104805.GA1503673@kroah.com> <20201022121849.GA1664412@kroah.com> <98d9df88-b7ef-fdfb-7d90-2fa7a9d7bab5@redhat.com> <20201022125759.GA1685526@kroah.com> <20201022135036.GA1787470@kroah.com> <134f162d711d466ebbd88906fae35b33@AcuMS.aculab.com> In-Reply-To: Accept-Language: en-GB, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.202.205.107] MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=C51A453 smtp.mailfrom=david.laight@aculab.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: aculab.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org RnJvbTogQXJuZCBCZXJnbWFubg0KPiBTZW50OiAyMyBPY3RvYmVyIDIwMjAgMTQ6MjMNCj4gDQo+ IE9uIEZyaSwgT2N0IDIzLCAyMDIwIGF0IDI6NDYgUE0gRGF2aWQgTGFpZ2h0IDxEYXZpZC5MYWln aHRAYWN1bGFiLmNvbT4gd3JvdGU6DQo+ID4NCj4gPiBGcm9tOiBHcmVnIEtIIDxncmVna2hAbGlu dXhmb3VuZGF0aW9uLm9yZz4NCj4gPiA+IFNlbnQ6IDIyIE9jdG9iZXIgMjAyMCAxNDo1MQ0KPiA+ DQo+ID4gSSd2ZSByYW1tZWQgdGhlIGNvZGUgaW50byBnb2Rib2x0Lg0KPiA+DQo+ID4gaHR0cHM6 Ly9nb2Rib2x0Lm9yZy96Lzl2NVBQVw0KPiA+DQo+ID4gRGVmaW5pdGVseSBhIGNsYW5nIGJ1Zy4N Cj4gPg0KPiA+IFNlYXJjaCBmb3IgW3d4XTI0IGluIHRoZSBjbGFuZyBvdXRwdXQuDQo+ID4gbnJf c2VncyBjb21lcyBpbiBhcyB3MiBhbmQgdGhlIGluaXRpYWwgYm91bmQgY2hlY2tzIGFyZSBkb25l IG9uIHcyLg0KPiA+IHcyNCBpcyBsb2FkZWQgZnJvbSB3MiAtIEkgZG9uJ3QgYmVsaWV2ZSB0aGlz IGNoYW5nZXMgdGhlIGhpZ2ggYml0cy4NCj4gDQo+IFlvdSBiZWxpZXZlIHdyb25nLCAibW92IHcy NCwgdzIiIGlzIGEgemVyby1leHRlbmRpbmcgb3BlcmF0aW9uLg0KDQpBaCBvaywgYnV0IGdjYyB1 c2VzIHV0eHcgZm9yIHRoZSBzYW1lIHRhc2suDQpJIGd1ZXNzIHRoZXkgY291bGQgYmUgdGhlIHNh bWUgb3Bjb2RlLg0KDQpMYXN0IHRpbWUgSSB3cm90ZSBBUk0gdGh1bWIgZGlkbid0IHJlYWxseSBl eGlzdCAtIG5ldmVyIG1pbmQgNjRiaXQNCg0KCURhdmlkDQoNCi0NClJlZ2lzdGVyZWQgQWRkcmVz cyBMYWtlc2lkZSwgQnJhbWxleSBSb2FkLCBNb3VudCBGYXJtLCBNaWx0b24gS2V5bmVzLCBNSzEg MVBULCBVSw0KUmVnaXN0cmF0aW9uIE5vOiAxMzk3Mzg2IChXYWxlcykNCg== From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: David Laight Subject: RE: Buggy commit tracked to: "Re: [PATCH 2/9] iov_iter: move rw_copy_check_uvector() into lib/iov_iter.c" Date: Fri, 23 Oct 2020 13:28:57 +0000 Message-ID: <8e758668cffa4713969df33299180c64@AcuMS.aculab.com> References: <20201022090155.GA1483166@kroah.com> <5fd6003b-55a6-2c3c-9a28-8fd3a575ca78@redhat.com> <20201022104805.GA1503673@kroah.com> <20201022121849.GA1664412@kroah.com> <98d9df88-b7ef-fdfb-7d90-2fa7a9d7bab5@redhat.com> <20201022125759.GA1685526@kroah.com> <20201022135036.GA1787470@kroah.com> <134f162d711d466ebbd88906fae35b33@AcuMS.aculab.com> In-Reply-To: MIME-Version: 1.0 Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 List-ID: To: 'Arnd Bergmann' Cc: Greg KH , David Hildenbrand , Al Viro , Nick Desaulniers , Christoph Hellwig , "kernel-team@android.com" , Andrew Morton , Jens Axboe , David Howells , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "linux-mips@vger.kernel.org" , "linux-parisc@vger.kernel.org" , "linuxppc-dev@lists.ozlabs.org" , "linux-s390@vger.kernel.org" , "sparclinux@vger.kernel.org" , "linux-block@vger.kernel.org" , "linux-scsi@vger.kernel.org" , "linux-fsdevel@vger.kernel.org" , "linux-aio@kvack.org" , "io-uring@vger.kernel.org" , "linux-arch@vger.kernel.org" , "linux-mm@kvack.org" , "netdev@vger.kernel.org" , "keyrings@vger.kernel.org" , "linux-security-module@vger.kernel.org" RnJvbTogQXJuZCBCZXJnbWFubg0KPiBTZW50OiAyMyBPY3RvYmVyIDIwMjAgMTQ6MjMNCj4gDQo+ IE9uIEZyaSwgT2N0IDIzLCAyMDIwIGF0IDI6NDYgUE0gRGF2aWQgTGFpZ2h0IDxEYXZpZC5MYWln aHRAYWN1bGFiLmNvbT4gd3JvdGU6DQo+ID4NCj4gPiBGcm9tOiBHcmVnIEtIIDxncmVna2hAbGlu dXhmb3VuZGF0aW9uLm9yZz4NCj4gPiA+IFNlbnQ6IDIyIE9jdG9iZXIgMjAyMCAxNDo1MQ0KPiA+ DQo+ID4gSSd2ZSByYW1tZWQgdGhlIGNvZGUgaW50byBnb2Rib2x0Lg0KPiA+DQo+ID4gaHR0cHM6 Ly9nb2Rib2x0Lm9yZy96Lzl2NVBQVw0KPiA+DQo+ID4gRGVmaW5pdGVseSBhIGNsYW5nIGJ1Zy4N Cj4gPg0KPiA+IFNlYXJjaCBmb3IgW3d4XTI0IGluIHRoZSBjbGFuZyBvdXRwdXQuDQo+ID4gbnJf c2VncyBjb21lcyBpbiBhcyB3MiBhbmQgdGhlIGluaXRpYWwgYm91bmQgY2hlY2tzIGFyZSBkb25l IG9uIHcyLg0KPiA+IHcyNCBpcyBsb2FkZWQgZnJvbSB3MiAtIEkgZG9uJ3QgYmVsaWV2ZSB0aGlz IGNoYW5nZXMgdGhlIGhpZ2ggYml0cy4NCj4gDQo+IFlvdSBiZWxpZXZlIHdyb25nLCAibW92IHcy NCwgdzIiIGlzIGEgemVyby1leHRlbmRpbmcgb3BlcmF0aW9uLg0KDQpBaCBvaywgYnV0IGdjYyB1 c2VzIHV0eHcgZm9yIHRoZSBzYW1lIHRhc2suDQpJIGd1ZXNzIHRoZXkgY291bGQgYmUgdGhlIHNh bWUgb3Bjb2RlLg0KDQpMYXN0IHRpbWUgSSB3cm90ZSBBUk0gdGh1bWIgZGlkbid0IHJlYWxseSBl eGlzdCAtIG5ldmVyIG1pbmQgNjRiaXQNCg0KCURhdmlkDQoNCi0NClJlZ2lzdGVyZWQgQWRkcmVz cyBMYWtlc2lkZSwgQnJhbWxleSBSb2FkLCBNb3VudCBGYXJtLCBNaWx0b24gS2V5bmVzLCBNSzEg MVBULCBVSw0KUmVnaXN0cmF0aW9uIE5vOiAxMzk3Mzg2IChXYWxlcykNCg== From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Laight Date: Fri, 23 Oct 2020 13:28:57 +0000 Subject: RE: Buggy commit tracked to: "Re: [PATCH 2/9] iov_iter: move rw_copy_check_uvector() into lib/iov_it Message-Id: <8e758668cffa4713969df33299180c64@AcuMS.aculab.com> List-Id: References: <20201022090155.GA1483166@kroah.com> <5fd6003b-55a6-2c3c-9a28-8fd3a575ca78@redhat.com> <20201022104805.GA1503673@kroah.com> <20201022121849.GA1664412@kroah.com> <98d9df88-b7ef-fdfb-7d90-2fa7a9d7bab5@redhat.com> <20201022125759.GA1685526@kroah.com> <20201022135036.GA1787470@kroah.com> <134f162d711d466ebbd88906fae35b33@AcuMS.aculab.com> In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; 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dmarc=pass (p=none dis=none) header.from=ACULAB.COM Received: from eu-smtp-delivery-151.mimecast.com (eu-smtp-delivery-151.mimecast.com [185.58.86.151]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4CHlSM41htzDqB5 for ; Sat, 24 Oct 2020 00:29:06 +1100 (AEDT) Received: from AcuMS.aculab.com (156.67.243.126 [156.67.243.126]) (Using TLS) by relay.mimecast.com with ESMTP id uk-mtapsc-1-v1vYoM8jOeGMKLhWfd8r_g-1; Fri, 23 Oct 2020 14:28:58 +0100 X-MC-Unique: v1vYoM8jOeGMKLhWfd8r_g-1 Received: from AcuMS.Aculab.com (fd9f:af1c:a25b:0:43c:695e:880f:8750) by AcuMS.aculab.com (fd9f:af1c:a25b:0:43c:695e:880f:8750) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Fri, 23 Oct 2020 14:28:57 +0100 Received: from AcuMS.Aculab.com ([fe80::43c:695e:880f:8750]) by AcuMS.aculab.com ([fe80::43c:695e:880f:8750%12]) with mapi id 15.00.1347.000; Fri, 23 Oct 2020 14:28:57 +0100 From: David Laight To: 'Arnd Bergmann' Subject: RE: Buggy commit tracked to: "Re: [PATCH 2/9] iov_iter: move rw_copy_check_uvector() into lib/iov_iter.c" Thread-Topic: Buggy commit tracked to: "Re: [PATCH 2/9] iov_iter: move rw_copy_check_uvector() into lib/iov_iter.c" Thread-Index: AQHWqE5GNDfnH4y9nkGWtfqJueR1KKmjTCJQgAAN4UiAAAD2IIAASOeCgAF+12D///tDgIAAEbpg Date: Fri, 23 Oct 2020 13:28:57 +0000 Message-ID: <8e758668cffa4713969df33299180c64@AcuMS.aculab.com> References: <20201022090155.GA1483166@kroah.com> <5fd6003b-55a6-2c3c-9a28-8fd3a575ca78@redhat.com> <20201022104805.GA1503673@kroah.com> <20201022121849.GA1664412@kroah.com> <98d9df88-b7ef-fdfb-7d90-2fa7a9d7bab5@redhat.com> <20201022125759.GA1685526@kroah.com> <20201022135036.GA1787470@kroah.com> <134f162d711d466ebbd88906fae35b33@AcuMS.aculab.com> In-Reply-To: Accept-Language: en-GB, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.202.205.107] MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; 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Fri, 23 Oct 2020 14:28:57 +0100 Received: from AcuMS.Aculab.com ([fe80::43c:695e:880f:8750]) by AcuMS.aculab.com ([fe80::43c:695e:880f:8750%12]) with mapi id 15.00.1347.000; Fri, 23 Oct 2020 14:28:57 +0100 From: David Laight To: 'Arnd Bergmann' Subject: RE: Buggy commit tracked to: "Re: [PATCH 2/9] iov_iter: move rw_copy_check_uvector() into lib/iov_iter.c" Thread-Topic: Buggy commit tracked to: "Re: [PATCH 2/9] iov_iter: move rw_copy_check_uvector() into lib/iov_iter.c" Thread-Index: AQHWqE5GNDfnH4y9nkGWtfqJueR1KKmjTCJQgAAN4UiAAAD2IIAASOeCgAF+12D///tDgIAAEbpg Date: Fri, 23 Oct 2020 13:28:57 +0000 Message-ID: <8e758668cffa4713969df33299180c64@AcuMS.aculab.com> References: <20201022090155.GA1483166@kroah.com> <5fd6003b-55a6-2c3c-9a28-8fd3a575ca78@redhat.com> <20201022104805.GA1503673@kroah.com> <20201022121849.GA1664412@kroah.com> <98d9df88-b7ef-fdfb-7d90-2fa7a9d7bab5@redhat.com> <20201022125759.GA1685526@kroah.com> <20201022135036.GA1787470@kroah.com> <134f162d711d466ebbd88906fae35b33@AcuMS.aculab.com> In-Reply-To: Accept-Language: en-GB, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.202.205.107] MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=C51A453 smtp.mailfrom=david.laight@aculab.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: aculab.com Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201023_092905_436002_7FC9FB6F X-CRM114-Status: GOOD ( 15.16 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "linux-aio@kvack.org" , David Hildenbrand , "linux-mips@vger.kernel.org" , David Howells , "linux-mm@kvack.org" , "keyrings@vger.kernel.org" , "sparclinux@vger.kernel.org" , Christoph Hellwig , "linux-arch@vger.kernel.org" , "linux-s390@vger.kernel.org" , "linux-scsi@vger.kernel.org" , "kernel-team@android.com" , "linux-block@vger.kernel.org" , Al Viro , "io-uring@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , Jens Axboe , "linux-parisc@vger.kernel.org" , Greg KH , Nick Desaulniers , "linux-kernel@vger.kernel.org" , "linux-security-module@vger.kernel.org" , "netdev@vger.kernel.org" , "linux-fsdevel@vger.kernel.org" , Andrew Morton , "linuxppc-dev@lists.ozlabs.org" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Arnd Bergmann > Sent: 23 October 2020 14:23 > > On Fri, Oct 23, 2020 at 2:46 PM David Laight wrote: > > > > From: Greg KH > > > Sent: 22 October 2020 14:51 > > > > I've rammed the code into godbolt. > > > > https://godbolt.org/z/9v5PPW > > > > Definitely a clang bug. > > > > Search for [wx]24 in the clang output. > > nr_segs comes in as w2 and the initial bound checks are done on w2. > > w24 is loaded from w2 - I don't believe this changes the high bits. > > You believe wrong, "mov w24, w2" is a zero-extending operation. Ah ok, but gcc uses utxw for the same task. I guess they could be the same opcode. Last time I wrote ARM thumb didn't really exist - never mind 64bit David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales) _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel