From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f179.google.com (mail-pf1-f179.google.com [209.85.210.179]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 04ECF3DB983 for ; Mon, 27 Jul 2026 03:58:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.179 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785124705; cv=none; b=EvgU0NdGBlX+oBcchRs+erw51PQeYoQpQt883deGs2uTGay40Veh3LWjimMCoV8GJqvGIb4i9uEC/EyPCt/2wfYekipp+BVt8sm8thu6m8w8joSveE9xpzpAlYLXzxTZqB968udcbSW321BbKSlniduYGrP/47OBg0gyvAmNqWc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785124705; c=relaxed/simple; bh=TlYdtrHL+mvv8ijwFP2OcSIxIVHRN2GalntvmJUIBYc=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=smSapnQREuhhNliM9xnXUSjh1T3LjXaCg+LihFrUtBG0cYlctJLYeGBGCfnbm2E0VRmtxUphX04R+A6qgz5IFxXGm8uROumNtB/uD5SQv2GapdriTltZ7onvwnGJt/iJhLnlrlAx/euZRkXx3sRRCs5BTbE2Kv8zZLRjwDqD1dk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=sBNWnRRk; arc=none smtp.client-ip=209.85.210.179 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="sBNWnRRk" Received: by mail-pf1-f179.google.com with SMTP id d2e1a72fcca58-84a4d8fd6ecso2216045b3a.1 for ; Sun, 26 Jul 2026 20:58:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1785124701; x=1785729501; darn=lists.linux.dev; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to:content-type; bh=CNXhg8nK5Amg7PhF6ggu9ut1cROCit9+iswBjWYSAoE=; b=sBNWnRRk1dfpocVOdwRQN2lEderoEim7wrcU4XWLuOdpzCkZu8FVRaYJ47F00h5Awj UpKOPEqKnCzKKMp7ImX33wvMtJ51Enm2GWglm6PykJ4bdYPm+0X8U5Fdpb6gNeb8ZB3G gbhiwy4ZRCmu5MNR6Dltn3J9xmTHWXUPFsdtyFw9MGPdwA4cufKQlk6JPHGsYcAK5irT sw1QQpCeF5UEnHpQRGgnNk/WU1L/WusRgVXEeXFVSsGwT7B8bs18wuvmPjmFPc2nB2co oP1qLD8PwDag+yyl920ss+fXWYDOqMz6bjnTZvHnUumGCgp8umZb5OtnqvNOEnuiGB8j BwSw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785124701; x=1785729501; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=CNXhg8nK5Amg7PhF6ggu9ut1cROCit9+iswBjWYSAoE=; b=Myh1taqfRnjAXUVnPI7fNIO1yM8pc2pD/JeLrMNJaaYQNm9G9CY1NQwIOk2ecqz58r q7SlTH35O7nqUriOEFuxdcWG0Aj3Dv3H27AEOd5hOWvHDyXungDX27EZvIf6+al2TQDp JMplPJNXHgEdryVUm9XFdpEYWwTh8UeBM3S5PKhdkTA/UqFhV1JN7J0fFuwtt0oxbiKL DOWS2tRtkm2Ty/Mwm1w2mttSBoDDBBsSriXg22WXcr1OLKJytd8udfHMk3wUaWN2ufTV GoueymszyvHyQbgIbcYif9Ihv86d0LPdQJqvg8fBBHUn2IweHKlNqoQmi7oox8wPhPoi ifXA== X-Gm-Message-State: AOJu0YyNCEvuEWwY4PVYScvx7fRpTP2Oi2BQtVCIuHplDYfiCV12h3/F 92fjuzhZ5IrXRUUXeZl+pppZIPZTrr31ok8m/zUbovCw2eURqjZcUfJ2 X-Gm-Gg: AR+sD11D6cr1G5DdN2cGuX3sziGqOabL+QDG2GU4bUbPfMcZ3e1fnStMQ5IQC6jiph6 StRtQNA5M8gGcPthA+Nc6tNiPvEUsBkVkbY/nz+2EL4buflx39lkWiOhy9xNn+JaN0v2r2mhw9d 1mbXv+4GQLqrhwi5ud4z6lskmgURZGZkm5j4DkXfdT7+417zQdK4l48USyaCCLJz+udwOaDuRH8 IqewKMrn1Lglr4lws2Q9jGP7zq8ifkPLVIAWepU8zJ0rj8iIHDYkHCSV5qNJLNfFyuCoVkA73JY iVCQTedgG7uAegnh5hOQ0ZTrxBbIzRZj2uBZ0bH1LUlRg3lVuy142nZwIE2L4wXEp1HvXWC5UOc 5rYGe+pFH5D942SCtfqKyKPVZqwdvBqdffn7hsgfslZ8lbA5CNTu10a+2HGQu6t9RSgDkp8Uz3k qARckIGzFsK0TbR5meEbbP X-Received: by 2002:a05:6a00:4294:b0:848:4190:ae72 with SMTP id d2e1a72fcca58-84e5955f15cmr5374554b3a.46.1785124701206; Sun, 26 Jul 2026 20:58:21 -0700 (PDT) Received: from bogon ([2408:8207:1832:1b44::c6b]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-cbbb660dedfsm2680815a12.4.2026.07.26.20.58.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 26 Jul 2026 20:58:20 -0700 (PDT) From: Weiming Shi To: "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?UTF-8?q?Eugenio=20P=C3=A9rez?= , Stefan Hajnoczi , Stefano Garzarella , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman Cc: virtualization@lists.linux.dev, kvm@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Xiang Mei , stable@vger.kernel.org Subject: [PATCH] vsock/virtio: prevent workers from using deleted virtqueues Date: Sun, 26 Jul 2026 20:58:01 -0700 Message-ID: <20260727035804.1860862-1-bestswngs@gmail.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The RX, TX and event workers read their virtqueue pointers before taking the mutex that protects the queue and its run flag. A work item delayed across freeze and restore can therefore retain a pointer deleted by virtio_vsock_vqs_del(), observe the run flag for the replacement queues, and use the freed pointer. RX has an additional path: when rx_run is clear, the common exit still refills the RX queue. A queued worker can consequently call virtqueue_add_sgs() immediately after freeze deletes the virtqueues. BUG: KASAN: slab-use-after-free in virtqueue_add_sgs Read of size 4 by task kworker/2:1 Workqueue: virtio_vsock virtio_transport_rx_work Call Trace: virtqueue_add_sgs (drivers/virtio/virtio_ring.c:2796) virtio_vsock_rx_fill (net/vmw_vsock/virtio_transport.c:332) virtio_transport_rx_work (net/vmw_vsock/virtio_transport.c:701) process_one_work (kernel/workqueue.c:3314) worker_thread (kernel/workqueue.c:3478) kthread (kernel/kthread.c:436) ret_from_fork (arch/x86/kernel/process.c:158) ret_from_fork_asm (arch/x86/entry/entry_64.S:245) ... Freed by task 141: kfree (mm/slub.c:6566) vp_del_vq (drivers/virtio/virtio_pci_common.c:259) vp_del_vqs (drivers/virtio/virtio_pci_common.c:285) virtio_vsock_freeze (net/vmw_vsock/virtio_transport.c:912) virtio_device_freeze (drivers/virtio/virtio.c:658) virtio_pci_freeze (drivers/virtio/virtio_pci_common.c:601) pci_pm_freeze (drivers/pci/pci-driver.c:1098) device_suspend (drivers/base/power/main.c:1968) Kernel panic - not syncing: KASAN: panic_on_warn set ... Read each worker's virtqueue under its mutex after confirming that the queue is running, and only refill RX while RX is running. Fixes: b917507e5ad9 ("vsock/virtio: stop workers during the .remove()") Cc: stable@vger.kernel.org Reported-by: Xiang Mei Assisted-by: OpenAI-Codex:gpt-5 Signed-off-by: Weiming Shi --- net/vmw_vsock/virtio_transport.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c index 57f2d6ec3ffc..79cf19f58943 100644 --- a/net/vmw_vsock/virtio_transport.c +++ b/net/vmw_vsock/virtio_transport.c @@ -346,12 +346,13 @@ static void virtio_transport_tx_work(struct work_struct *work) struct virtqueue *vq; bool added = false; - vq = vsock->vqs[VSOCK_VQ_TX]; mutex_lock(&vsock->tx_lock); if (!vsock->tx_run) goto out; + vq = vsock->vqs[VSOCK_VQ_TX]; + do { struct sk_buff *skb; unsigned int len; @@ -451,13 +452,13 @@ static void virtio_transport_event_work(struct work_struct *work) container_of(work, struct virtio_vsock, event_work); struct virtqueue *vq; - vq = vsock->vqs[VSOCK_VQ_EVENT]; - mutex_lock(&vsock->event_lock); if (!vsock->event_run) goto out; + vq = vsock->vqs[VSOCK_VQ_EVENT]; + do { struct virtio_vsock_event *event; unsigned int len; @@ -634,13 +635,13 @@ static void virtio_transport_rx_work(struct work_struct *work) container_of(work, struct virtio_vsock, rx_work); struct virtqueue *vq; - vq = vsock->vqs[VSOCK_VQ_RX]; - mutex_lock(&vsock->rx_lock); if (!vsock->rx_run) goto out; + vq = vsock->vqs[VSOCK_VQ_RX]; + do { virtqueue_disable_cb(vq); for (;;) { @@ -689,7 +690,8 @@ static void virtio_transport_rx_work(struct work_struct *work) } while (!virtqueue_enable_cb(vq)); out: - if (vsock->rx_buf_nr < vsock->rx_buf_max_nr / 2) + if (vsock->rx_run && + vsock->rx_buf_nr < vsock->rx_buf_max_nr / 2) virtio_vsock_rx_fill(vsock); mutex_unlock(&vsock->rx_lock); } -- 2.55.0