From patchwork Mon Mar 15 13:55:19 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 401432 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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, 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 2209BC433E9 for ; Mon, 15 Mar 2021 14:01:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EBCCB64E83 for ; Mon, 15 Mar 2021 14:01:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233243AbhCOOBN (ORCPT ); Mon, 15 Mar 2021 10:01:13 -0400 Received: from mail.kernel.org ([198.145.29.99]:37612 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231623AbhCON7g (ORCPT ); Mon, 15 Mar 2021 09:59:36 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id DABC964F5D; Mon, 15 Mar 2021 13:59:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1615816755; bh=lYVe70g8E3JiBLX0Rln+mX3b0K2j3UrL8r/mjPTCdPA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GNogp8mA+jNDRwArkEAH6pWX7NH4xEGlomIJFHPGRWW0O0rcmLwFoY2u3mJ67MsMK EHeD1TM5NLTaY8COFBk1MlS1ESChydqGR2SAhg7zWCg8ij8Qu+uwn/tF8kYiQ7fYFy xO+LhOyk+XNZVzOdYdRh1nCQrEIwHkq455w7Xf4w= From: gregkh@linuxfoundation.org To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Roman Bolshakov , Bodo Stroesser , Aleksandr Miloserdov , "Martin K. Petersen" , Sasha Levin Subject: [PATCH 5.4 087/168] scsi: target: core: Prevent underflow for service actions Date: Mon, 15 Mar 2021 14:55:19 +0100 Message-Id: <20210315135553.241683807@linuxfoundation.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210315135550.333963635@linuxfoundation.org> References: <20210315135550.333963635@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Greg Kroah-Hartman From: Aleksandr Miloserdov [ Upstream commit 14d24e2cc77411301e906a8cf41884739de192de ] TCM buffer length doesn't necessarily equal 8 + ADDITIONAL LENGTH which might be considered an underflow in case of Data-In size being greater than 8 + ADDITIONAL LENGTH. So truncate buffer length to prevent underflow. Link: https://lore.kernel.org/r/20210209072202.41154-3-a.miloserdov@yadro.com Reviewed-by: Roman Bolshakov Reviewed-by: Bodo Stroesser Signed-off-by: Aleksandr Miloserdov Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/target/target_core_pr.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/drivers/target/target_core_pr.c b/drivers/target/target_core_pr.c index 5e931690e697..51e690ab4d29 100644 --- a/drivers/target/target_core_pr.c +++ b/drivers/target/target_core_pr.c @@ -3731,6 +3731,7 @@ core_scsi3_pri_read_keys(struct se_cmd *cmd) spin_unlock(&dev->t10_pr.registration_lock); put_unaligned_be32(add_len, &buf[4]); + target_set_cmd_data_length(cmd, 8 + add_len); transport_kunmap_data_sg(cmd); @@ -3749,7 +3750,7 @@ core_scsi3_pri_read_reservation(struct se_cmd *cmd) struct t10_pr_registration *pr_reg; unsigned char *buf; u64 pr_res_key; - u32 add_len = 16; /* Hardcoded to 16 when a reservation is held. */ + u32 add_len = 0; if (cmd->data_length < 8) { pr_err("PRIN SA READ_RESERVATIONS SCSI Data Length: %u" @@ -3767,8 +3768,9 @@ core_scsi3_pri_read_reservation(struct se_cmd *cmd) pr_reg = dev->dev_pr_res_holder; if (pr_reg) { /* - * Set the hardcoded Additional Length + * Set the Additional Length to 16 when a reservation is held */ + add_len = 16; put_unaligned_be32(add_len, &buf[4]); if (cmd->data_length < 22) @@ -3804,6 +3806,8 @@ core_scsi3_pri_read_reservation(struct se_cmd *cmd) (pr_reg->pr_res_type & 0x0f); } + target_set_cmd_data_length(cmd, 8 + add_len); + err: spin_unlock(&dev->dev_reservation_lock); transport_kunmap_data_sg(cmd); @@ -3822,7 +3826,7 @@ core_scsi3_pri_report_capabilities(struct se_cmd *cmd) struct se_device *dev = cmd->se_dev; struct t10_reservation *pr_tmpl = &dev->t10_pr; unsigned char *buf; - u16 add_len = 8; /* Hardcoded to 8. */ + u16 len = 8; /* Hardcoded to 8. */ if (cmd->data_length < 6) { pr_err("PRIN SA REPORT_CAPABILITIES SCSI Data Length:" @@ -3834,7 +3838,7 @@ core_scsi3_pri_report_capabilities(struct se_cmd *cmd) if (!buf) return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; - put_unaligned_be16(add_len, &buf[0]); + put_unaligned_be16(len, &buf[0]); buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */ buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */ buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */ @@ -3863,6 +3867,8 @@ core_scsi3_pri_report_capabilities(struct se_cmd *cmd) buf[4] |= 0x02; /* PR_TYPE_WRITE_EXCLUSIVE */ buf[5] |= 0x01; /* PR_TYPE_EXCLUSIVE_ACCESS_ALLREG */ + target_set_cmd_data_length(cmd, len); + transport_kunmap_data_sg(cmd); return 0; @@ -4023,6 +4029,7 @@ core_scsi3_pri_read_full_status(struct se_cmd *cmd) * Set ADDITIONAL_LENGTH */ put_unaligned_be32(add_len, &buf[4]); + target_set_cmd_data_length(cmd, 8 + add_len); transport_kunmap_data_sg(cmd);