From patchwork Fri Jul 14 18:24:45 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eric Auger X-Patchwork-Id: 13314155 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id B4392EB64DC for ; Fri, 14 Jul 2023 18:25:22 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qKNTN-0007Kc-Co; Fri, 14 Jul 2023 14:24:57 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qKNTM-0007KH-18 for qemu-devel@nongnu.org; Fri, 14 Jul 2023 14:24:56 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qKNTK-0008FH-IZ for qemu-devel@nongnu.org; Fri, 14 Jul 2023 14:24:55 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1689359093; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=T6MK5YzOYCNol9ozDKibgbWnFnHIfqfo9K9xoth9Ugw=; b=AmLNKzILAlL7sIq34FrjhzN4FWuvF1gq6YPlVnkzFAREy9jsh2PUnB7DHj405MoyonwuWt 6Qc1ocdEYmiy2x8DOAnr5EJA7/8+L03xthLqUMonguEL3LPKwvs9LUeS58XsjzhfkgszIG O90WEmB5xJiP1/XdZgpexZwQFrMYXN8= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-186-U47EfWqaOriHxzRXV0q_PA-1; Fri, 14 Jul 2023 14:24:51 -0400 X-MC-Unique: U47EfWqaOriHxzRXV0q_PA-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id B466B101A54E; Fri, 14 Jul 2023 18:24:49 +0000 (UTC) Received: from laptop.redhat.com (unknown [10.39.192.21]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3CFF7201EE6E; Fri, 14 Jul 2023 18:24:48 +0000 (UTC) From: Eric Auger To: eric.auger.pro@gmail.com, eric.auger@redhat.com, qemu-devel@nongnu.org, qemu-arm@nongnu.org, mst@redhat.com, jean-philippe@linaro.org Cc: qemu-stable@nongnu.org Subject: [PATCH] hw/virtio-iommu: Fix potential OOB access in virtio_iommu_handle_command() Date: Fri, 14 Jul 2023 20:24:45 +0200 Message-Id: <20230714182445.877168-1-eric.auger@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.4 Received-SPF: pass client-ip=170.10.133.124; envelope-from=eric.auger@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org In the virtio_iommu_handle_command() when a PROBE request is handled, output_size takes a value greater than the tail size and on a subsequent iteration we can get a stack out-of-band access. Initialize the output_size on each iteration. The issue was found with ASAN. Credits to: Yiming Tao(Zhejiang University) Gaoning Pan(Zhejiang University) Fixes: 1733eebb9e7 ("virtio-iommu: Implement RESV_MEM probe request") Signed-off-by: Eric Auger Reported-by: Mauro Matteo Cascella --- hw/virtio/virtio-iommu.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/hw/virtio/virtio-iommu.c b/hw/virtio/virtio-iommu.c index 201127c488..4dcf1d5c62 100644 --- a/hw/virtio/virtio-iommu.c +++ b/hw/virtio/virtio-iommu.c @@ -728,13 +728,15 @@ static void virtio_iommu_handle_command(VirtIODevice *vdev, VirtQueue *vq) VirtIOIOMMU *s = VIRTIO_IOMMU(vdev); struct virtio_iommu_req_head head; struct virtio_iommu_req_tail tail = {}; - size_t output_size = sizeof(tail), sz; VirtQueueElement *elem; unsigned int iov_cnt; struct iovec *iov; void *buf = NULL; + size_t sz; for (;;) { + size_t output_size = sizeof(tail); + elem = virtqueue_pop(vq, sizeof(VirtQueueElement)); if (!elem) { return;