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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id BB472C4332F for ; Wed, 16 Nov 2022 22:40:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234171AbiKPWkV convert rfc822-to-8bit (ORCPT ); Wed, 16 Nov 2022 17:40:21 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57730 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229446AbiKPWkQ (ORCPT ); Wed, 16 Nov 2022 17:40:16 -0500 Received: from eu-smtp-delivery-151.mimecast.com (eu-smtp-delivery-151.mimecast.com [185.58.86.151]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C439FB7E3 for ; Wed, 16 Nov 2022 14:40:13 -0800 (PST) Received: from AcuMS.aculab.com (156.67.243.121 [156.67.243.121]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id uk-mta-43-QmRQHnZtPD-f-gfapKz2sw-1; Wed, 16 Nov 2022 22:40:10 +0000 X-MC-Unique: QmRQHnZtPD-f-gfapKz2sw-1 Received: from AcuMS.Aculab.com (10.202.163.4) by AcuMS.aculab.com (10.202.163.4) with Microsoft SMTP Server (TLS) id 15.0.1497.42; Wed, 16 Nov 2022 22:40:09 +0000 Received: from AcuMS.Aculab.com ([::1]) by AcuMS.aculab.com ([::1]) with mapi id 15.00.1497.044; Wed, 16 Nov 2022 22:40:09 +0000 From: David Laight To: "'Kirill A. Shutemov'" , "kirill@shutemov.name" CC: "dave.hansen@intel.com" , "dave.hansen@linux.intel.com" , "jejb@linux.ibm.com" , "linux-kernel@vger.kernel.org" , "lkp@intel.com" , "martin.petersen@oracle.com" , "oe-kbuild-all@lists.linux.dev" , "x86@kernel.org" Subject: RE: [PATCH 1/2] scsi: Fix get_user() in call sg_scsi_ioctl() Thread-Topic: [PATCH 1/2] scsi: Fix get_user() in call sg_scsi_ioctl() Thread-Index: AQHY+VSNJhar89N50E24WEBG2HeXiK5CJcRg Date: Wed, 16 Nov 2022 22:40:09 +0000 Message-ID: <9d59ec367e0445028775d304bcf64704@AcuMS.aculab.com> References: <20221115155802.p3vjnk7eqqcyskt3@box.shutemov.name> <20221116004353.15052-1-kirill.shutemov@linux.intel.com> <20221116004353.15052-2-kirill.shutemov@linux.intel.com> In-Reply-To: <20221116004353.15052-2-kirill.shutemov@linux.intel.com> 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 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: aculab.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Kirill A. Shutemov > Sent: 16 November 2022 00:44 > > get_user() expects the pointer to be pointer-to-simple-variable type, > but sic->data is array of 'unsigned char'. It violates get_user() > contracts. > > Cast it explicitly to 'unsigned char __user *'. It matches current > behaviour. > > This is preparation for fixing sparse warnings caused by Linear Address > Masking patchset. > > Signed-off-by: Kirill A. Shutemov > Cc: "James E.J. Bottomley" > Cc: "Martin K. Petersen" > --- > drivers/scsi/scsi_ioctl.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/scsi/scsi_ioctl.c b/drivers/scsi/scsi_ioctl.c > index 2d20da55fb64..72b3ab5137b8 100644 > --- a/drivers/scsi/scsi_ioctl.c > +++ b/drivers/scsi/scsi_ioctl.c > @@ -519,7 +519,7 @@ static int sg_scsi_ioctl(struct request_queue *q, fmode_t mode, > return -EFAULT; > if (in_len > PAGE_SIZE || out_len > PAGE_SIZE) > return -EINVAL; > - if (get_user(opcode, sic->data)) > + if (get_user(opcode, (unsigned char __user *)sic->data)) Using &sic->data[0] should work and is much nicer than the cast. David > return -EFAULT; > > bytes = max(in_len, out_len); > -- > 2.38.0 - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)