From patchwork Mon Jul 1 17:12:28 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roman Bolshakov X-Patchwork-Id: 11026519 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8FC7C13BD for ; Mon, 1 Jul 2019 17:25:56 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 81C73212D5 for ; Mon, 1 Jul 2019 17:25:56 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 74A7228501; Mon, 1 Jul 2019 17:25:56 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BD0CA212D5 for ; Mon, 1 Jul 2019 17:25:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729496AbfGARZy (ORCPT ); Mon, 1 Jul 2019 13:25:54 -0400 Received: from mta-02.yadro.com ([89.207.88.252]:48382 "EHLO mta-01.yadro.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729465AbfGARZy (ORCPT ); Mon, 1 Jul 2019 13:25:54 -0400 X-Greylist: delayed 638 seconds by postgrey-1.27 at vger.kernel.org; Mon, 01 Jul 2019 13:25:53 EDT Received: from localhost (unknown [127.0.0.1]) by mta-01.yadro.com (Postfix) with ESMTP id DBC3841209; Mon, 1 Jul 2019 17:15:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=yadro.com; h= content-type:content-type:content-transfer-encoding:mime-version :x-mailer:message-id:date:date:subject:subject:from:from :received:received:received; s=mta-01; t=1562001314; x= 1563815715; bh=2pTfcDA66tjDGwu7Oi5jwYbieNU5oSXtY1QDybfj+eY=; b=g 9bCI01zzUbD/K8vtiK8j0BJI3C4o7X4UQCwGJ5yzaxkgms7B2knd5x+ntWWIdCrO WRHz3z9iTU30cF4yrNYUZ2LPPs9MTST85LDFvwQ3lkYvjRl+pZIkQadpfKDek8KV 5FK+9+xDsptoF8PS7aoDiDous4cq5d+Inc/LTTuD78= X-Virus-Scanned: amavisd-new at yadro.com Received: from mta-01.yadro.com ([127.0.0.1]) by localhost (mta-01.yadro.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id A86K5mYJZYYm; Mon, 1 Jul 2019 20:15:14 +0300 (MSK) Received: from T-EXCH-02.corp.yadro.com (t-exch-02.corp.yadro.com [172.17.10.102]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mta-01.yadro.com (Postfix) with ESMTPS id E422041860; Mon, 1 Jul 2019 20:15:13 +0300 (MSK) Received: from localhost (172.17.128.60) by T-EXCH-02.corp.yadro.com (172.17.10.102) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384_P384) id 15.1.669.32; Mon, 1 Jul 2019 20:15:13 +0300 From: Roman Bolshakov To: , CC: Roman Bolshakov , "Martin K. Petersen" , Bart Van Assche Subject: [PATCH] scsi: target/iblock: Fix overrun in WRITE SAME emulation Date: Mon, 1 Jul 2019 20:12:28 +0300 Message-ID: <20190701171226.81654-1-r.bolshakov@yadro.com> X-Mailer: git-send-email 2.22.0 MIME-Version: 1.0 X-Originating-IP: [172.17.128.60] X-ClientProxiedBy: T-EXCH-01.corp.yadro.com (172.17.10.101) To T-EXCH-02.corp.yadro.com (172.17.10.102) Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP WRITE SAME corrupts data on the block device behind iblock if the command is emulated. The emulation code issues (M - 1) * N times more bios than requested, where M is the number of 512 blocks per real block size and N is the NUMBER OF LOGICAL BLOCKS specified in WRITE SAME command. So, for a device with 4k blocks, 7 * N more LBAs gets written after the requested range. The issue happens because the number of 512 byte sectors to be written is decreased one by one while the real bios are typically from 1 to 8 512 byte sectors per bio. Signed-off-by: Roman Bolshakov Reviewed-by: Bart Van Assche --- drivers/target/target_core_iblock.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c index f4a075303e9a..6949ea8bc387 100644 --- a/drivers/target/target_core_iblock.c +++ b/drivers/target/target_core_iblock.c @@ -502,7 +502,7 @@ iblock_execute_write_same(struct se_cmd *cmd) /* Always in 512 byte units for Linux/Block */ block_lba += sg->length >> SECTOR_SHIFT; - sectors -= 1; + sectors -= sg->length >> SECTOR_SHIFT; } iblock_submit_bios(&list);