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=-9.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 83318C04E84 for ; Wed, 15 May 2019 12:10:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 55A7B20657 for ; Wed, 15 May 2019 12:10:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1557922202; bh=08Z4xd9D9Qz6dSAragbPoj3DMIMll9Ryx2BIS7iaqD4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=f1J7/zTmbbXUwQ/Q9wToLkTJ5EOAELdL9fHOolY3/eBPmMzFxLAJS12mDccpSy6UE P9g3NRN+bl1MMc1pJPwAXksue9Jiai0KVrmaXtd/aJIRL98WgAccFZgbK2bfCw+dfj +CYCbhtSVC42hJ2GO9i3sJ1uQS6FzKvNVcM6jOqk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728638AbfEOLH3 (ORCPT ); Wed, 15 May 2019 07:07:29 -0400 Received: from mail.kernel.org ([198.145.29.99]:39108 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728921AbfEOLH3 (ORCPT ); Wed, 15 May 2019 07:07:29 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id AAB282084E; Wed, 15 May 2019 11:07:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1557918448; bh=08Z4xd9D9Qz6dSAragbPoj3DMIMll9Ryx2BIS7iaqD4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QN/OssqEhC7rF4QO6+fwiPlqonkeDBsDwR48wCmyY2XgHPhxTUU2HcckUP1WtMYlw CEpYlkapJECOdbqdxSbBuUF7ASHeiOs68xGiP8iNKcd1njzC0W5F6UdQpczueSsDjr Zt/VXcv9fMdVQCUxt0312xVN5wOuVZVb4pkN69rI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Malte Leip , Sasha Levin Subject: [PATCH 4.4 135/266] usb: usbip: fix isoc packet num validation in get_pipe Date: Wed, 15 May 2019 12:54:02 +0200 Message-Id: <20190515090727.498704313@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190515090722.696531131@linuxfoundation.org> References: <20190515090722.696531131@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org commit c409ca3be3c6ff3a1eeb303b191184e80d412862 upstream. Backport of the upstream commit, which fixed c6688ef9f297. c6688ef9f297 got backported as commit b6f826ba10dc, as the unavailable function usb_endpoint_maxp_mult had to be replaced. The upstream commit removed the call to this function, so the backport is straightforward. Original commit message: Change the validation of number_of_packets in get_pipe to compare the number of packets to a fixed maximum number of packets allowed, set to be 1024. This number was chosen due to it being used by other drivers as well, for example drivers/usb/host/uhci-q.c Background/reason: The get_pipe function in stub_rx.c validates the number of packets in isochronous mode and aborts with an error if that number is too large, in order to prevent malicious input from possibly triggering large memory allocations. This was previously done by checking whether pdu->u.cmd_submit.number_of_packets is bigger than the number of packets that would be needed for pdu->u.cmd_submit.transfer_buffer_length bytes if all except possibly the last packet had maximum length, given by usb_endpoint_maxp(epd) * usb_endpoint_maxp_mult(epd). This leads to an error if URBs with packets shorter than the maximum possible length are submitted, which is allowed according to Documentation/driver-api/usb/URB.rst and occurs for example with the snd-usb-audio driver. Fixes: b6f826ba10dc ("usbip: fix stub_rx: harden CMD_SUBMIT path to handle malicious input") Signed-off-by: Malte Leip Cc: stable # 4.4.x Signed-off-by: Sasha Levin --- drivers/usb/usbip/stub_rx.c | 18 +++--------------- drivers/usb/usbip/usbip_common.h | 7 +++++++ 2 files changed, 10 insertions(+), 15 deletions(-) diff --git a/drivers/usb/usbip/stub_rx.c b/drivers/usb/usbip/stub_rx.c index 56cacb68040c..808e3a317954 100644 --- a/drivers/usb/usbip/stub_rx.c +++ b/drivers/usb/usbip/stub_rx.c @@ -380,22 +380,10 @@ static int get_pipe(struct stub_device *sdev, struct usbip_header *pdu) } if (usb_endpoint_xfer_isoc(epd)) { - /* validate packet size and number of packets */ - unsigned int maxp, packets, bytes; - -#define USB_EP_MAXP_MULT_SHIFT 11 -#define USB_EP_MAXP_MULT_MASK (3 << USB_EP_MAXP_MULT_SHIFT) -#define USB_EP_MAXP_MULT(m) \ - (((m) & USB_EP_MAXP_MULT_MASK) >> USB_EP_MAXP_MULT_SHIFT) - - maxp = usb_endpoint_maxp(epd); - maxp *= (USB_EP_MAXP_MULT( - __le16_to_cpu(epd->wMaxPacketSize)) + 1); - bytes = pdu->u.cmd_submit.transfer_buffer_length; - packets = DIV_ROUND_UP(bytes, maxp); - + /* validate number of packets */ if (pdu->u.cmd_submit.number_of_packets < 0 || - pdu->u.cmd_submit.number_of_packets > packets) { + pdu->u.cmd_submit.number_of_packets > + USBIP_MAX_ISO_PACKETS) { dev_err(&sdev->udev->dev, "CMD_SUBMIT: isoc invalid num packets %d\n", pdu->u.cmd_submit.number_of_packets); diff --git a/drivers/usb/usbip/usbip_common.h b/drivers/usb/usbip/usbip_common.h index 0fc5ace57c0e..af903aa4ad90 100644 --- a/drivers/usb/usbip/usbip_common.h +++ b/drivers/usb/usbip/usbip_common.h @@ -134,6 +134,13 @@ extern struct device_attribute dev_attr_usbip_debug; #define USBIP_DIR_OUT 0x00 #define USBIP_DIR_IN 0x01 +/* + * Arbitrary limit for the maximum number of isochronous packets in an URB, + * compare for example the uhci_submit_isochronous function in + * drivers/usb/host/uhci-q.c + */ +#define USBIP_MAX_ISO_PACKETS 1024 + /** * struct usbip_header_basic - data pertinent to every request * @command: the usbip request type -- 2.20.1