From nobody Fri Nov 7 00:46:23 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1544615488196339.82227501210696; Wed, 12 Dec 2018 03:51:28 -0800 (PST) Received: from localhost ([::1]:44026 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gX331-0004cy-39 for importer@patchew.org; Wed, 12 Dec 2018 06:51:27 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:43895) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gX31I-0003bv-N7 for qemu-devel@nongnu.org; Wed, 12 Dec 2018 06:49:43 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gX31E-00044S-O3 for qemu-devel@nongnu.org; Wed, 12 Dec 2018 06:49:40 -0500 Received: from mx1.redhat.com ([209.132.183.28]:55156) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gX31E-00040d-GZ for qemu-devel@nongnu.org; Wed, 12 Dec 2018 06:49:36 -0500 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id D3A893084297; Wed, 12 Dec 2018 11:49:34 +0000 (UTC) Received: from localhost.localdomain (ovpn-116-138.sin2.redhat.com [10.67.116.138]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 85E9D608C5; Wed, 12 Dec 2018 11:49:32 +0000 (UTC) From: P J P To: Yuval Shaia Date: Wed, 12 Dec 2018 17:17:21 +0530 Message-Id: <20181212114726.24060-2-ppandit@redhat.com> In-Reply-To: <20181212114726.24060-1-ppandit@redhat.com> References: <20181212114726.24060-1-ppandit@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.40]); Wed, 12 Dec 2018 11:49:34 +0000 (UTC) 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: 209.132.183.28 Subject: [Qemu-devel] [PATCH v1 1/6] rdma: check num_sge does not exceed MAX_SGE X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Prasad J Pandit , Li Qiang , Qemu Developers , Saar Amar Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" From: Prasad J Pandit rdma back-end has scatter/gather array ibv_sge[MAX_SGE=3D4] set to have 4 elements. A guest could send a 'PvrdmaSqWqe' ring element with 'num_sge' set to > MAX_SGE, which may lead to OOB access issue. Add check to avoid it. Reported-by: Saar Amar Signed-off-by: Prasad J Pandit Reviewed-by: Yuval Shaia --- hw/rdma/rdma_backend.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) Update v1: use new error code VENDOR_ERR_INV_NUM_SGE -> https://lists.gnu.org/archive/html/qemu-devel/2018-12/msg02220.html diff --git a/hw/rdma/rdma_backend.c b/hw/rdma/rdma_backend.c index ae1e4dcb29..bd4710d16f 100644 --- a/hw/rdma/rdma_backend.c +++ b/hw/rdma/rdma_backend.c @@ -476,9 +476,9 @@ void rdma_backend_post_send(RdmaBackendDev *backend_dev, } =20 pr_dbg("num_sge=3D%d\n", num_sge); - if (!num_sge) { - pr_dbg("num_sge=3D0\n"); - complete_work(IBV_WC_GENERAL_ERR, VENDOR_ERR_NO_SGE, ctx); + if (!num_sge || num_sge > MAX_SGE) { + pr_dbg("invalid num_sge=3D%d\n", num_sge); + complete_work(IBV_WC_GENERAL_ERR, VENDOR_ERR_INV_NUM_SGE, ctx); return; } =20 @@ -603,9 +603,9 @@ void rdma_backend_post_recv(RdmaBackendDev *backend_dev, } =20 pr_dbg("num_sge=3D%d\n", num_sge); - if (!num_sge) { - pr_dbg("num_sge=3D0\n"); - complete_work(IBV_WC_GENERAL_ERR, VENDOR_ERR_NO_SGE, ctx); + if (!num_sge || num_sge > MAX_SGE) { + pr_dbg("invalid num_sge=3D%d\n", num_sge); + complete_work(IBV_WC_GENERAL_ERR, VENDOR_ERR_INV_NUM_SGE, ctx); return; } =20 --=20 2.19.2