From patchwork Fri Aug 20 03:28:13 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Damien Le Moal X-Patchwork-Id: 500769 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=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 EAE5FC432BE for ; Fri, 20 Aug 2021 03:30:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CFAB1610FE for ; Fri, 20 Aug 2021 03:30:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238257AbhHTDan (ORCPT ); Thu, 19 Aug 2021 23:30:43 -0400 Received: from esa3.hgst.iphmx.com ([216.71.153.141]:4894 "EHLO esa3.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237933AbhHTDal (ORCPT ); Thu, 19 Aug 2021 23:30:41 -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=1629430203; x=1660966203; h=from:to:subject:date:message-id:in-reply-to:references: mime-version:content-transfer-encoding; bh=+m6b8j3RINuUe0RFKMpYV8vJ6kViZNE1w9rd61chdFY=; b=GBy7B+v5y8O1yvsZrJkGHRQCo1cuP6aeKdk2/7boraG4fo2DnXqbvk0q c8h+AOZnwL9O0ExciEFRuPPJPmvWREQKVNiUr8W7nrF5TWaQgPwHsB/zj CZc9sTgl4c7Y4jK8ZMs+CVZN0dVLSdUZ60RgbUHNcYYFjskrs22BTiY74 po71VyiUyFOdRecHkID05MNej2z4G8UW+CpP7y56+A94gt3K075xbLsem bJmk/jq6tZkwyYt2BW2/vvMyywoq0DGe6pFyRy3e5DWNJ+t3I+iEYHIAT FPYiM5Nwl13v3QDRngHK4h4hD4cb7nntISSM78UryDE/SyMOvGXs1yDdM w==; X-IronPort-AV: E=Sophos;i="5.84,336,1620662400"; d="scan'208";a="182646446" Received: from h199-255-45-15.hgst.com (HELO uls-op-cesaep02.wdc.com) ([199.255.45.15]) by ob1.hgst.iphmx.com with ESMTP; 20 Aug 2021 11:30:02 +0800 IronPort-SDR: jrQg5TxWjpvqufP6yf3v922wgjZdHvbkUSCDcRzqf4SHGFktWvFCSrey5DNf8+ukVeIdxQrys/ gu8VomHDa1x1yvYdhalDRSXpZSIN/aXozTxGy1PIe5gBFenZGyLCeIf6gy7HYPgs5/mASBc0fY mH8w2h8Xrb4OUiLLJYc1tNdGNgH9Z5chWr/VQMVFswRmilx8EX0Jb15iDWxiiepZe/FRNemYpL CKfIXSYmaJivQZlIpMM3Xw1UW5am2WWxB212XY6YrsndeA5Rju1e1d+wx6JfC18seDntS3bk0w jSdsOsAMcbcn+AyA9CUoHYjG Received: from uls-op-cesaip02.wdc.com ([10.248.3.37]) by uls-op-cesaep02.wdc.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Aug 2021 20:05:24 -0700 IronPort-SDR: g7MFX9HHMbbYnX9GgQSjM+QaPVWKobqh+72RsFAoiSCMf2zqEbgVJCZuyX+y16xqmpQyM8Tahm 7YBfjpRWQqb0wjkCT2R3tguzuOhcGjWfocJIpwbB2fFexXZkOCVH1+1rk/nMT6TiOnZDn4CIkl MqI1Hou18Xib3KMLs0vxYv0dXJYaugm53dhmpH0GSx3cIiEe+Sd22y45dN58o3xkbSrwGeZ/Wc 10TeCtTsF3aL+aWV3mXThzqgOz2Aln29OJaHqfDZjDAW+162yS7LYhYZVSg9Mmn+STMX8evwC3 MRo= WDCIronportException: Internal Received: from washi.fujisawa.hgst.com ([10.149.53.254]) by uls-op-cesaip02.wdc.com with ESMTP; 19 Aug 2021 20:30:03 -0700 From: Damien Le Moal To: linux-scsi@vger.kernel.org, "Martin K . Petersen" Subject: [PATCH v2 2/2] scsi: fix scsi_mode_select() buffer length handling Date: Fri, 20 Aug 2021 12:28:13 +0900 Message-Id: <20210820032813.575032-3-damien.lemoal@wdc.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210820032813.575032-1-damien.lemoal@wdc.com> References: <20210820032813.575032-1-damien.lemoal@wdc.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org The MODE SELECT (6) command allows handling mode page buffers that are up to 255 bytes, including the 4 byte header needed in front of the page buffer. For requests larger than this limit, automatically use the MODE SENSE 10 command. In both cases, since scsi_mode_select() adds the mode select page header, checks on the buffer length value must include this header size to avoid overflows of the command CDB allocatione length field. While at it, use put_unaligned_be16() for setting the header block descriptor length and CDB allocation length when using MODE SELECT 10. Signed-off-by: Damien Le Moal --- drivers/scsi/scsi_lib.c | 21 +++++++++++++-------- 1 file changed, 13 insertions(+), 8 deletions(-) diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 327ea74a5e31..c9a825f583d6 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -2026,8 +2026,15 @@ scsi_mode_select(struct scsi_device *sdev, int pf, int sp, int modepage, memset(cmd, 0, sizeof(cmd)); cmd[1] = (pf ? 0x10 : 0) | (sp ? 0x01 : 0); - if (sdev->use_10_for_ms) { - if (len > 65535) + /* + * Use MODE SENSE 10 if the device asked for it or if the mode page + * and the mode select header cannot fit within the maximumm 255B of + * the MODE SELECT (6) command. + */ + if (sdev->use_10_for_ms || + len + 4 > 255 || + data->block_descriptor_length > 255) { + if (len > 65535 - 8) return -EINVAL; real_buffer = kmalloc(8 + len, GFP_KERNEL); if (!real_buffer) @@ -2040,15 +2047,13 @@ scsi_mode_select(struct scsi_device *sdev, int pf, int sp, int modepage, real_buffer[3] = data->device_specific; real_buffer[4] = data->longlba ? 0x01 : 0; real_buffer[5] = 0; - real_buffer[6] = data->block_descriptor_length >> 8; - real_buffer[7] = data->block_descriptor_length; + put_unaligned_be16(data->block_descriptor_length, + &real_buffer[6]); cmd[0] = MODE_SELECT_10; - cmd[7] = len >> 8; - cmd[8] = len; + put_unaligned_be16(len, &cmd[7]); } else { - if (len > 255 || data->block_descriptor_length > 255 || - data->longlba) + if (data->longlba) return -EINVAL; real_buffer = kmalloc(4 + len, GFP_KERNEL);