From 9c7a5582f5d720dc35cfcc42ccaded69f0642e4a Mon Sep 17 00:00:00 2001 From: Stefano Garzarella Date: Fri, 28 Jun 2019 14:36:57 +0200 Subject: [PATCH 1/3] vsock/virtio: use RCU to avoid use-after-free on the_virtio_vsock Some callbacks used by the upper layers can run while we are in the .remove(). A potential use-after-free can happen, because we free the_virtio_vsock without knowing if the callbacks are over or not. To solve this issue we move the assignment of the_virtio_vsock at the end of .probe(), when we finished all the initialization, and at the beginning of .remove(), before to release resources. For the same reason, we do the same also for the vdev->priv. We use RCU to be sure that all callbacks that use the_virtio_vsock ended before freeing it. This is not required for callbacks that use vdev->priv, because after the vdev->config->del_vqs() we are sure that they are ended and will no longer be invoked. We also take the mutex during the .remove() to avoid that .probe() can run while we are resetting the device. Signed-off-by: Stefano Garzarella Signed-off-by: David S. Miller --- net/vmw_vsock/virtio_transport.c | 67 +++++++++++++++++++++----------- 1 file changed, 44 insertions(+), 23 deletions(-) diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c index 9c287e3e393c8..7ad510ec12e05 100644 --- a/net/vmw_vsock/virtio_transport.c +++ b/net/vmw_vsock/virtio_transport.c @@ -65,19 +65,22 @@ struct virtio_vsock { u32 guest_cid; }; -static struct virtio_vsock *virtio_vsock_get(void) -{ - return the_virtio_vsock; -} - static u32 virtio_transport_get_local_cid(void) { - struct virtio_vsock *vsock = virtio_vsock_get(); + struct virtio_vsock *vsock; + u32 ret; - if (!vsock) - return VMADDR_CID_ANY; + rcu_read_lock(); + vsock = rcu_dereference(the_virtio_vsock); + if (!vsock) { + ret = VMADDR_CID_ANY; + goto out_rcu; + } - return vsock->guest_cid; + ret = vsock->guest_cid; +out_rcu: + rcu_read_unlock(); + return ret; } static void virtio_transport_loopback_work(struct work_struct *work) @@ -197,14 +200,18 @@ virtio_transport_send_pkt(struct virtio_vsock_pkt *pkt) struct virtio_vsock *vsock; int len = pkt->len; - vsock = virtio_vsock_get(); + rcu_read_lock(); + vsock = rcu_dereference(the_virtio_vsock); if (!vsock) { virtio_transport_free_pkt(pkt); - return -ENODEV; + len = -ENODEV; + goto out_rcu; } - if (le64_to_cpu(pkt->hdr.dst_cid) == vsock->guest_cid) - return virtio_transport_send_pkt_loopback(vsock, pkt); + if (le64_to_cpu(pkt->hdr.dst_cid) == vsock->guest_cid) { + len = virtio_transport_send_pkt_loopback(vsock, pkt); + goto out_rcu; + } if (pkt->reply) atomic_inc(&vsock->queued_replies); @@ -214,6 +221,9 @@ virtio_transport_send_pkt(struct virtio_vsock_pkt *pkt) spin_unlock_bh(&vsock->send_pkt_list_lock); queue_work(virtio_vsock_workqueue, &vsock->send_pkt_work); + +out_rcu: + rcu_read_unlock(); return len; } @@ -222,12 +232,14 @@ virtio_transport_cancel_pkt(struct vsock_sock *vsk) { struct virtio_vsock *vsock; struct virtio_vsock_pkt *pkt, *n; - int cnt = 0; + int cnt = 0, ret; LIST_HEAD(freeme); - vsock = virtio_vsock_get(); + rcu_read_lock(); + vsock = rcu_dereference(the_virtio_vsock); if (!vsock) { - return -ENODEV; + ret = -ENODEV; + goto out_rcu; } spin_lock_bh(&vsock->send_pkt_list_lock); @@ -255,7 +267,11 @@ virtio_transport_cancel_pkt(struct vsock_sock *vsk) queue_work(virtio_vsock_workqueue, &vsock->rx_work); } - return 0; + ret = 0; + +out_rcu: + rcu_read_unlock(); + return ret; } static void virtio_vsock_rx_fill(struct virtio_vsock *vsock) @@ -590,8 +606,6 @@ static int virtio_vsock_probe(struct virtio_device *vdev) vsock->rx_buf_max_nr = 0; atomic_set(&vsock->queued_replies, 0); - vdev->priv = vsock; - the_virtio_vsock = vsock; mutex_init(&vsock->tx_lock); mutex_init(&vsock->rx_lock); mutex_init(&vsock->event_lock); @@ -613,6 +627,9 @@ static int virtio_vsock_probe(struct virtio_device *vdev) virtio_vsock_event_fill(vsock); mutex_unlock(&vsock->event_lock); + vdev->priv = vsock; + rcu_assign_pointer(the_virtio_vsock, vsock); + mutex_unlock(&the_virtio_vsock_mutex); return 0; @@ -627,6 +644,12 @@ static void virtio_vsock_remove(struct virtio_device *vdev) struct virtio_vsock *vsock = vdev->priv; struct virtio_vsock_pkt *pkt; + mutex_lock(&the_virtio_vsock_mutex); + + vdev->priv = NULL; + rcu_assign_pointer(the_virtio_vsock, NULL); + synchronize_rcu(); + flush_work(&vsock->loopback_work); flush_work(&vsock->rx_work); flush_work(&vsock->tx_work); @@ -666,12 +689,10 @@ static void virtio_vsock_remove(struct virtio_device *vdev) } spin_unlock_bh(&vsock->loopback_list_lock); - mutex_lock(&the_virtio_vsock_mutex); - the_virtio_vsock = NULL; - mutex_unlock(&the_virtio_vsock_mutex); - vdev->config->del_vqs(vdev); + mutex_unlock(&the_virtio_vsock_mutex); + kfree(vsock); } From 17dd1367389cfe7f150790c83247b68e0c19d106 Mon Sep 17 00:00:00 2001 From: Stefano Garzarella Date: Fri, 28 Jun 2019 14:36:58 +0200 Subject: [PATCH 2/3] vsock/virtio: stop workers during the .remove() Before to call vdev->config->reset(vdev) we need to be sure that no one is accessing the device, for this reason, we add new variables in the struct virtio_vsock to stop the workers during the .remove(). This patch also add few comments before vdev->config->reset(vdev) and vdev->config->del_vqs(vdev). Suggested-by: Stefan Hajnoczi Suggested-by: Michael S. Tsirkin Signed-off-by: Stefano Garzarella Signed-off-by: David S. Miller --- net/vmw_vsock/virtio_transport.c | 51 +++++++++++++++++++++++++++++++- 1 file changed, 50 insertions(+), 1 deletion(-) diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c index 7ad510ec12e05..1b44ec6f3f6c3 100644 --- a/net/vmw_vsock/virtio_transport.c +++ b/net/vmw_vsock/virtio_transport.c @@ -38,6 +38,7 @@ struct virtio_vsock { * must be accessed with tx_lock held. */ struct mutex tx_lock; + bool tx_run; struct work_struct send_pkt_work; spinlock_t send_pkt_list_lock; @@ -53,6 +54,7 @@ struct virtio_vsock { * must be accessed with rx_lock held. */ struct mutex rx_lock; + bool rx_run; int rx_buf_nr; int rx_buf_max_nr; @@ -60,6 +62,7 @@ struct virtio_vsock { * vqs[VSOCK_VQ_EVENT] must be accessed with event_lock held. */ struct mutex event_lock; + bool event_run; struct virtio_vsock_event event_list[8]; u32 guest_cid; @@ -94,6 +97,10 @@ static void virtio_transport_loopback_work(struct work_struct *work) spin_unlock_bh(&vsock->loopback_list_lock); mutex_lock(&vsock->rx_lock); + + if (!vsock->rx_run) + goto out; + while (!list_empty(&pkts)) { struct virtio_vsock_pkt *pkt; @@ -102,6 +109,7 @@ static void virtio_transport_loopback_work(struct work_struct *work) virtio_transport_recv_pkt(pkt); } +out: mutex_unlock(&vsock->rx_lock); } @@ -130,6 +138,9 @@ virtio_transport_send_pkt_work(struct work_struct *work) mutex_lock(&vsock->tx_lock); + if (!vsock->tx_run) + goto out; + vq = vsock->vqs[VSOCK_VQ_TX]; for (;;) { @@ -188,6 +199,7 @@ virtio_transport_send_pkt_work(struct work_struct *work) if (added) virtqueue_kick(vq); +out: mutex_unlock(&vsock->tx_lock); if (restart_rx) @@ -323,6 +335,10 @@ static void virtio_transport_tx_work(struct work_struct *work) vq = vsock->vqs[VSOCK_VQ_TX]; mutex_lock(&vsock->tx_lock); + + if (!vsock->tx_run) + goto out; + do { struct virtio_vsock_pkt *pkt; unsigned int len; @@ -333,6 +349,8 @@ static void virtio_transport_tx_work(struct work_struct *work) added = true; } } while (!virtqueue_enable_cb(vq)); + +out: mutex_unlock(&vsock->tx_lock); if (added) @@ -361,6 +379,9 @@ static void virtio_transport_rx_work(struct work_struct *work) mutex_lock(&vsock->rx_lock); + if (!vsock->rx_run) + goto out; + do { virtqueue_disable_cb(vq); for (;;) { @@ -470,6 +491,9 @@ static void virtio_transport_event_work(struct work_struct *work) mutex_lock(&vsock->event_lock); + if (!vsock->event_run) + goto out; + do { struct virtio_vsock_event *event; unsigned int len; @@ -484,7 +508,7 @@ static void virtio_transport_event_work(struct work_struct *work) } while (!virtqueue_enable_cb(vq)); virtqueue_kick(vsock->vqs[VSOCK_VQ_EVENT]); - +out: mutex_unlock(&vsock->event_lock); } @@ -619,12 +643,18 @@ static int virtio_vsock_probe(struct virtio_device *vdev) INIT_WORK(&vsock->send_pkt_work, virtio_transport_send_pkt_work); INIT_WORK(&vsock->loopback_work, virtio_transport_loopback_work); + mutex_lock(&vsock->tx_lock); + vsock->tx_run = true; + mutex_unlock(&vsock->tx_lock); + mutex_lock(&vsock->rx_lock); virtio_vsock_rx_fill(vsock); + vsock->rx_run = true; mutex_unlock(&vsock->rx_lock); mutex_lock(&vsock->event_lock); virtio_vsock_event_fill(vsock); + vsock->event_run = true; mutex_unlock(&vsock->event_lock); vdev->priv = vsock; @@ -659,6 +689,24 @@ static void virtio_vsock_remove(struct virtio_device *vdev) /* Reset all connected sockets when the device disappear */ vsock_for_each_connected_socket(virtio_vsock_reset_sock); + /* Stop all work handlers to make sure no one is accessing the device, + * so we can safely call vdev->config->reset(). + */ + mutex_lock(&vsock->rx_lock); + vsock->rx_run = false; + mutex_unlock(&vsock->rx_lock); + + mutex_lock(&vsock->tx_lock); + vsock->tx_run = false; + mutex_unlock(&vsock->tx_lock); + + mutex_lock(&vsock->event_lock); + vsock->event_run = false; + mutex_unlock(&vsock->event_lock); + + /* Flush all device writes and interrupts, device will not use any + * more buffers. + */ vdev->config->reset(vdev); mutex_lock(&vsock->rx_lock); @@ -689,6 +737,7 @@ static void virtio_vsock_remove(struct virtio_device *vdev) } spin_unlock_bh(&vsock->loopback_list_lock); + /* Delete virtqueues and flush outstanding callbacks if any */ vdev->config->del_vqs(vdev); mutex_unlock(&the_virtio_vsock_mutex); From 0d20e56ecca0f5025f9041d11ee247129b5e48ce Mon Sep 17 00:00:00 2001 From: Stefano Garzarella Date: Fri, 28 Jun 2019 14:36:59 +0200 Subject: [PATCH 3/3] vsock/virtio: fix flush of works during the .remove() This patch moves the flush of works after vdev->config->del_vqs(vdev), because we need to be sure that no workers run before to free the 'vsock' object. Since we stopped the workers using the [tx|rx|event]_run flags, we are sure no one is accessing the device while we are calling vdev->config->reset(vdev), so we can safely move the workers' flush. Before the vdev->config->del_vqs(vdev), workers can be scheduled by VQ callbacks, so we must flush them after del_vqs(), to avoid use-after-free of 'vsock' object. Suggested-by: Michael S. Tsirkin Signed-off-by: Stefano Garzarella Signed-off-by: David S. Miller --- net/vmw_vsock/virtio_transport.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c index 1b44ec6f3f6c3..96dafa9782683 100644 --- a/net/vmw_vsock/virtio_transport.c +++ b/net/vmw_vsock/virtio_transport.c @@ -680,12 +680,6 @@ static void virtio_vsock_remove(struct virtio_device *vdev) rcu_assign_pointer(the_virtio_vsock, NULL); synchronize_rcu(); - flush_work(&vsock->loopback_work); - flush_work(&vsock->rx_work); - flush_work(&vsock->tx_work); - flush_work(&vsock->event_work); - flush_work(&vsock->send_pkt_work); - /* Reset all connected sockets when the device disappear */ vsock_for_each_connected_socket(virtio_vsock_reset_sock); @@ -740,6 +734,15 @@ static void virtio_vsock_remove(struct virtio_device *vdev) /* Delete virtqueues and flush outstanding callbacks if any */ vdev->config->del_vqs(vdev); + /* Other works can be queued before 'config->del_vqs()', so we flush + * all works before to free the vsock object to avoid use after free. + */ + flush_work(&vsock->loopback_work); + flush_work(&vsock->rx_work); + flush_work(&vsock->tx_work); + flush_work(&vsock->event_work); + flush_work(&vsock->send_pkt_work); + mutex_unlock(&the_virtio_vsock_mutex); kfree(vsock);