From patchwork Mon Oct 24 09:48:53 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lei Yu X-Patchwork-Id: 13016991 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 2D4DCC38A2D for ; Mon, 24 Oct 2022 09:54:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:List-Subscribe:List-Help: List-Post:List-Archive:List-Unsubscribe:List-Id:Message-Id:Date:Subject:To: From:Reply-To:Cc:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=nyrNLHtAoflQpgo/UZoQSiDhcO56QHbP3rf8JDATynI=; b=AqsN8ekxMmN+tL O8t3aWqcUXYscYti4koZMudOmVVT3mK1uU8a0NiSzyRyqD8tkDoIyXcWFt8S/AXgPwL0QYOxRkLzH nsu5BfaH18+ONX1+vZHi1RZAxqlyfiok0jo7xG6C6JhINZo9lsCYsJXGpoYF5U6G1+cxbkeWL3giW WgOylMAmB/NG2+kVxZSe0oHB3bKEJP7Z5twKoq8rDBwMFUKYc9UQ8ZbQ1K7lkshhPYnoqjVpHEp6s btM6R///6QDHuq+3kBf4cgCtoTcLmRod7uq6ND23hJMeNkLF+naktYLxx4cGyorfioHXpc18Rx+Vy DDkwnPzO3CS9H2s069LA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1omu8N-000WKc-T8; Mon, 24 Oct 2022 09:52:40 +0000 Received: from mail-pg1-x52a.google.com ([2607:f8b0:4864:20::52a]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1omu4q-000UjQ-KJ for linux-arm-kernel@lists.infradead.org; Mon, 24 Oct 2022 09:49:02 +0000 Received: by mail-pg1-x52a.google.com with SMTP id f193so8299413pgc.0 for ; Mon, 24 Oct 2022 02:48:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20210112.gappssmtp.com; s=20210112; h=message-id:date:subject:to:from:from:to:cc:subject:date:message-id :reply-to; bh=XnAGFFH6hlB9GkUsVAF0QK5SQgC3hf7SewwhsiTdnHA=; b=5kjelKIaoQNlKa+/O/o1rvz6jyKf6B3J8qwQv7aZhfvbh8k0GyIkH5SOcN2anjY7Ax J8s4LN2F2vS0tcd/9WiqQEXXYJINxsEgNo/NSHRFHNx//7ZGecdbOc7YWviJ6LnZVRsF uo+Hf5KMVgLFcFwTyyc4jAED5DvhQsI9ZDdbmGF/tg08oMiXUltHu8V73hvJ4RwSgil3 8eZUqK6P5QEWc2DDKGNb0UAaLu5NmK2x0DyI6kqv9d9RZbclUKwuiruh7nuUov5+/trk pLWSTn4ST0wxX7/r0DeAg8KjnefevIOYTSfptQ9OZwWr3fXDhBoks9jqt8B5W+i9Fnhy GO+A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=message-id:date:subject:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=XnAGFFH6hlB9GkUsVAF0QK5SQgC3hf7SewwhsiTdnHA=; b=cuVyAx8K2p3X3W3nEsWfKc9VDHR9xcMhd2Qnhk+Gs2WSk7EIz5k5jgoYDQ+vUIJEmW uJQIuQQ+YRcrsuNlnHiZp/5Na0Mz91BEz+ATOCG/XAwrMfSX2A0mQ6EPUj0TtaCisjUO Js25rza+FZCjO+HGY72zjx41r1DRfOrTaJeU0D1m2x3GOnm05IjT4IgXHsCX5E/1HOM4 XOvSD9jYy3NqS1DJKs3/c27KKj+ZZvoX9ZZexn4hObK1zf0R6s7sSsgCT1JthgJxWD7a ysKo5XOIadUXCWwdPEpz0nlFmTHXhgFKIpw8M1NSJWGvho5PVYaiCfuGuLK788c6cYne hqlg== X-Gm-Message-State: ACrzQf0LxEcwdgfhkiyYRaJTRs2mJsQvE2x2YWFb0IwzTcML35HljH+E 0fk7snVSqi0dMtHoX9Gu72Pb6g== X-Google-Smtp-Source: AMsMyM4HPivtKKPf5IVhM0PGh2Blshb7Bsjuf6zWDIjtnNi6dimHYXQBWA8uy3VdAxqCaibOS/yKGQ== X-Received: by 2002:a63:34c8:0:b0:46e:f67c:c117 with SMTP id b191-20020a6334c8000000b0046ef67cc117mr5823331pga.401.1666604938609; Mon, 24 Oct 2022 02:48:58 -0700 (PDT) Received: from localhost ([103.136.220.142]) by smtp.gmail.com with ESMTPSA id p1-20020a62d001000000b0056bc742d21esm1764058pfg.176.2022.10.24.02.48.57 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Mon, 24 Oct 2022 02:48:58 -0700 (PDT) From: Lei YU To: Felipe Balbi , Greg Kroah-Hartman , Joel Stanley , Andrew Jeffery , Lei YU , Henry Tian , Jakob Koschel , linux-usb@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-aspeed@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: [PATCH] usb: gadget: aspeed: fix buffer overflow Date: Mon, 24 Oct 2022 09:48:53 +0000 Message-Id: <20221024094853.2877441-1-yulei.sh@bytedance.com> X-Mailer: git-send-email 2.11.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221024_024900_706176_777B9FB9 X-CRM114-Status: GOOD ( 22.89 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Henry Tian In ast_vhub_epn_handle_ack() when the received data length exceeds the buffer, it does not check the case and just copies to req.buf and cause a buffer overflow, kernel oops on this case. This issue could be reproduced on a BMC with an OS that enables the lan over USB: 1. In OS, enable the usb eth dev, verify it pings the BMC OK; 2. In OS, set the usb dev mtu to 2000. (Default is 1500); 3. In OS, ping the BMC with `-s 2000` argument. The BMC kernel will get oops with below logs: skbuff: skb_over_panic: text:8058e098 len:2048 put:2048 head:84c678a0 data:84c678c2 tail:0x84c680c2 end:0x84c67f00 dev:usb0 ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:113! Internal error: Oops - BUG: 0 [#1] ARM CPU: 0 PID: 0 Comm: swapper Not tainted 5.15.69-c9fb275-dirty-d1e579a #1 Hardware name: Generic DT based system PC is at skb_panic+0x60/0x6c LR is at irq_work_queue+0x6c/0x94 Fix the issue by checking the length and set `-EOVERFLOW`. Tested: Verify the BMC kernel does not get oops in the above case, and the usb ethernet gets RX packets errors instead. Signed-off-by: Lei YU Signed-off-by: Henry Tian Acked-by: Benjamin Herrenschmidt Reviewed-by: Neal Liu --- drivers/usb/gadget/udc/aspeed-vhub/core.c | 2 +- drivers/usb/gadget/udc/aspeed-vhub/epn.c | 16 ++++++++++++---- 2 files changed, 13 insertions(+), 5 deletions(-) diff --git a/drivers/usb/gadget/udc/aspeed-vhub/core.c b/drivers/usb/gadget/udc/aspeed-vhub/core.c index 7a635c499777..ac3ca24f8b04 100644 --- a/drivers/usb/gadget/udc/aspeed-vhub/core.c +++ b/drivers/usb/gadget/udc/aspeed-vhub/core.c @@ -37,7 +37,7 @@ void ast_vhub_done(struct ast_vhub_ep *ep, struct ast_vhub_req *req, list_del_init(&req->queue); - if (req->req.status == -EINPROGRESS) + if ((req->req.status == -EINPROGRESS) || (status == -EOVERFLOW)) req->req.status = status; if (req->req.dma) { diff --git a/drivers/usb/gadget/udc/aspeed-vhub/epn.c b/drivers/usb/gadget/udc/aspeed-vhub/epn.c index b5252880b389..56e55472daa1 100644 --- a/drivers/usb/gadget/udc/aspeed-vhub/epn.c +++ b/drivers/usb/gadget/udc/aspeed-vhub/epn.c @@ -84,6 +84,7 @@ static void ast_vhub_epn_handle_ack(struct ast_vhub_ep *ep) { struct ast_vhub_req *req; unsigned int len; + int status = 0; u32 stat; /* Read EP status */ @@ -119,9 +120,15 @@ static void ast_vhub_epn_handle_ack(struct ast_vhub_ep *ep) len = VHUB_EP_DMA_TX_SIZE(stat); /* If not using DMA, copy data out if needed */ - if (!req->req.dma && !ep->epn.is_in && len) - memcpy(req->req.buf + req->req.actual, ep->buf, len); - + if (!req->req.dma && !ep->epn.is_in && len) { + if (req->req.actual + len > req->req.length) { + req->last_desc = 1; + status = -EOVERFLOW; + goto done; + } else { + memcpy(req->req.buf + req->req.actual, ep->buf, len); + } + } /* Adjust size */ req->req.actual += len; @@ -129,9 +136,10 @@ static void ast_vhub_epn_handle_ack(struct ast_vhub_ep *ep) if (len < ep->ep.maxpacket) req->last_desc = 1; +done: /* That's it ? complete the request and pick a new one */ if (req->last_desc >= 0) { - ast_vhub_done(ep, req, 0); + ast_vhub_done(ep, req, status); req = list_first_entry_or_null(&ep->queue, struct ast_vhub_req, queue);