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=-6.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS 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 3CEF0C43331 for ; Tue, 24 Mar 2020 17:31:11 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 099A82076E for ; Tue, 24 Mar 2020 17:31:11 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="J141/3IZ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 099A82076E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:52660 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jGnOQ-0002en-5z for qemu-devel@archiver.kernel.org; Tue, 24 Mar 2020 13:31:10 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:56958) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jGnMv-0000sh-1w for qemu-devel@nongnu.org; Tue, 24 Mar 2020 13:29:38 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1jGnMt-00027W-KZ for qemu-devel@nongnu.org; Tue, 24 Mar 2020 13:29:36 -0400 Received: from us-smtp-delivery-74.mimecast.com ([216.205.24.74]:41267) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1jGnMt-00027S-GX for qemu-devel@nongnu.org; Tue, 24 Mar 2020 13:29:35 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1585070975; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=ZLKKAKrjIBwrHe5HVHBR0pfCjaxHZFLeGL6GxqW0Gmw=; b=J141/3IZLbHF/1FsBKXNzSrrYszXI/l9pj0Eog7ZfeiWHWrQt04J2uqp4LCQjHcM2DYhbw +Haw1dF+QvaIAYqZiCM+YO5gRKeqEMtiXnUpmTHirJVZIgCpFUsH8m496TpZy9e9AC5Y9s 9nq1Za5FKn6eN9Qa6ozY0EsdQ2+gwQI= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-275-GXCcrn35Pw2b3-qtmtypjw-1; Tue, 24 Mar 2020 13:29:31 -0400 X-MC-Unique: GXCcrn35Pw2b3-qtmtypjw-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id B230A801E53; Tue, 24 Mar 2020 17:29:29 +0000 (UTC) Received: from localhost.localdomain (ovpn-117-4.sin2.redhat.com [10.67.117.4]) by smtp.corp.redhat.com (Postfix) with ESMTPS id B7E1419C6A; Tue, 24 Mar 2020 17:29:25 +0000 (UTC) From: P J P To: Jason Wang Subject: [PATCH v7] net: tulip: check frame size and r/w data length Date: Tue, 24 Mar 2020 22:57:22 +0530 Message-Id: <20200324172722.32082-1-ppandit@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 216.205.24.74 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Prasad J Pandit , Stefan Hajnoczi , Sven Schnelle , Qemu Developers , Li Qiang , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Ziming Zhang Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Prasad J Pandit Tulip network driver while copying tx/rx buffers does not check frame size against r/w data length. This may lead to OOB buffer access. Add check to avoid it. Limit iterations over descriptors to avoid potential infinite loop issue in tulip_xmit_list_update. Reported-by: Li Qiang Reported-by: Ziming Zhang Reported-by: Jason Wang Signed-off-by: Prasad J Pandit --- hw/net/tulip.c | 36 +++++++++++++++++++++++++++--------- 1 file changed, 27 insertions(+), 9 deletions(-) Update v7: fix length check expression to replace '>=3D' with '>' -> https://lists.gnu.org/archive/html/qemu-devel/2020-03/msg07160.html diff --git a/hw/net/tulip.c b/hw/net/tulip.c index cfac2719d3..1295f51d07 100644 --- a/hw/net/tulip.c +++ b/hw/net/tulip.c @@ -170,6 +170,10 @@ static void tulip_copy_rx_bytes(TULIPState *s, struct = tulip_descriptor *desc) } else { len =3D s->rx_frame_len; } + + if (s->rx_frame_len + len > sizeof(s->rx_frame)) { + return; + } pci_dma_write(&s->dev, desc->buf_addr1, s->rx_frame + (s->rx_frame_size - s->rx_frame_len), len); s->rx_frame_len -=3D len; @@ -181,6 +185,10 @@ static void tulip_copy_rx_bytes(TULIPState *s, struct = tulip_descriptor *desc) } else { len =3D s->rx_frame_len; } + + if (s->rx_frame_len + len > sizeof(s->rx_frame)) { + return; + } pci_dma_write(&s->dev, desc->buf_addr2, s->rx_frame + (s->rx_frame_size - s->rx_frame_len), len); s->rx_frame_len -=3D len; @@ -227,7 +235,8 @@ static ssize_t tulip_receive(TULIPState *s, const uint8= _t *buf, size_t size) =20 trace_tulip_receive(buf, size); =20 - if (size < 14 || size > 2048 || s->rx_frame_len || tulip_rx_stopped(s)= ) { + if (size < 14 || size > sizeof(s->rx_frame) - 4 + || s->rx_frame_len || tulip_rx_stopped(s)) { return 0; } =20 @@ -275,7 +284,6 @@ static ssize_t tulip_receive_nc(NetClientState *nc, return tulip_receive(qemu_get_nic_opaque(nc), buf, size); } =20 - static NetClientInfo net_tulip_info =3D { .type =3D NET_CLIENT_DRIVER_NIC, .size =3D sizeof(NICState), @@ -558,7 +566,7 @@ static void tulip_tx(TULIPState *s, struct tulip_descri= ptor *desc) if ((s->csr[6] >> CSR6_OM_SHIFT) & CSR6_OM_MASK) { /* Internal or external Loopback */ tulip_receive(s, s->tx_frame, s->tx_frame_len); - } else { + } else if (s->tx_frame_len <=3D sizeof(s->tx_frame)) { qemu_send_packet(qemu_get_queue(s->nic), s->tx_frame, s->tx_frame_len); } @@ -570,23 +578,31 @@ static void tulip_tx(TULIPState *s, struct tulip_desc= riptor *desc) } } =20 -static void tulip_copy_tx_buffers(TULIPState *s, struct tulip_descriptor *= desc) +static int tulip_copy_tx_buffers(TULIPState *s, struct tulip_descriptor *d= esc) { int len1 =3D (desc->control >> TDES1_BUF1_SIZE_SHIFT) & TDES1_BUF1_SIZ= E_MASK; int len2 =3D (desc->control >> TDES1_BUF2_SIZE_SHIFT) & TDES1_BUF2_SIZ= E_MASK; =20 + if (s->tx_frame_len + len1 > sizeof(s->tx_frame)) { + return -1; + } if (len1) { pci_dma_read(&s->dev, desc->buf_addr1, s->tx_frame + s->tx_frame_len, len1); s->tx_frame_len +=3D len1; } =20 + if (s->tx_frame_len + len2 > sizeof(s->tx_frame)) { + return -1; + } if (len2) { pci_dma_read(&s->dev, desc->buf_addr2, s->tx_frame + s->tx_frame_len, len2); s->tx_frame_len +=3D len2; } desc->status =3D (len1 + len2) ? 0 : 0x7fffffff; + + return 0; } =20 static void tulip_setup_filter_addr(TULIPState *s, uint8_t *buf, int n) @@ -651,13 +667,15 @@ static uint32_t tulip_ts(TULIPState *s) =20 static void tulip_xmit_list_update(TULIPState *s) { +#define TULIP_DESC_MAX 128 + uint8_t i =3D 0; struct tulip_descriptor desc; =20 if (tulip_ts(s) !=3D CSR5_TS_SUSPENDED) { return; } =20 - for (;;) { + for (i =3D 0; i < TULIP_DESC_MAX; i++) { tulip_desc_read(s, s->current_tx_desc, &desc); tulip_dump_tx_descriptor(s, &desc); =20 @@ -675,10 +693,10 @@ static void tulip_xmit_list_update(TULIPState *s) s->tx_frame_len =3D 0; } =20 - tulip_copy_tx_buffers(s, &desc); - - if (desc.control & TDES1_LS) { - tulip_tx(s, &desc); + if (!tulip_copy_tx_buffers(s, &desc)) { + if (desc.control & TDES1_LS) { + tulip_tx(s, &desc); + } } } tulip_desc_write(s, s->current_tx_desc, &desc); --=20 2.25.1