Jason Wang
2022-Jun-28 09:03 UTC
[PATCH] virtio-net: fix the race between refill work and close
We try using cancel_delayed_work_sync() to prevent the work from
enabling NAPI. This is insufficient since we don't disable the the
source the scheduling of the refill work. This means an NAPI after
cancel_delayed_work_sync() can schedule the refill work then can
re-enable the NAPI that leads to use-after-free [1].
Since the work can enable NAPI, we can't simply disable NAPI before
calling cancel_delayed_work_sync(). So fix this by introducing a
dedicated boolean to control whether or not the work could be
scheduled from NAPI.
[1]
=================================================================BUG: KASAN:
use-after-free in refill_work+0x43/0xd4
Read of size 2 at addr ffff88810562c92e by task kworker/2:1/42
CPU: 2 PID: 42 Comm: kworker/2:1 Not tainted 5.19.0-rc1+ #480
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS
rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014
Workqueue: events refill_work
Call Trace:
<TASK>
dump_stack_lvl+0x34/0x44
print_report.cold+0xbb/0x6ac
? _printk+0xad/0xde
? refill_work+0x43/0xd4
kasan_report+0xa8/0x130
? refill_work+0x43/0xd4
refill_work+0x43/0xd4
process_one_work+0x43d/0x780
worker_thread+0x2a0/0x6f0
? process_one_work+0x780/0x780
kthread+0x167/0x1a0
? kthread_exit+0x50/0x50
ret_from_fork+0x22/0x30
</TASK>
...
Fixes: b2baed69e605c ("virtio_net: set/cancel work on
ndo_open/ndo_stop")
Signed-off-by: Jason Wang <jasowang at redhat.com>
---
drivers/net/virtio_net.c | 38 ++++++++++++++++++++++++++++++++++++--
1 file changed, 36 insertions(+), 2 deletions(-)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index db05b5e930be..21bf1e5c81ef 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -251,6 +251,12 @@ struct virtnet_info {
/* Does the affinity hint is set for virtqueues? */
bool affinity_hint_set;
+ /* Is refill work enabled? */
+ bool refill_work_enabled;
+
+ /* The lock to synchronize the access to refill_work_enabled */
+ spinlock_t refill_lock;
+
/* CPU hotplug instances for online & dead */
struct hlist_node node;
struct hlist_node node_dead;
@@ -348,6 +354,20 @@ static struct page *get_a_page(struct receive_queue *rq,
gfp_t gfp_mask)
return p;
}
+static void enable_refill_work(struct virtnet_info *vi)
+{
+ spin_lock(&vi->refill_lock);
+ vi->refill_work_enabled = true;
+ spin_unlock(&vi->refill_lock);
+}
+
+static void disable_refill_work(struct virtnet_info *vi)
+{
+ spin_lock(&vi->refill_lock);
+ vi->refill_work_enabled = false;
+ spin_unlock(&vi->refill_lock);
+}
+
static void virtqueue_napi_schedule(struct napi_struct *napi,
struct virtqueue *vq)
{
@@ -1527,8 +1547,12 @@ static int virtnet_receive(struct receive_queue *rq, int
budget,
}
if (rq->vq->num_free > min((unsigned int)budget,
virtqueue_get_vring_size(rq->vq)) / 2) {
- if (!try_fill_recv(vi, rq, GFP_ATOMIC))
- schedule_delayed_work(&vi->refill, 0);
+ if (!try_fill_recv(vi, rq, GFP_ATOMIC)) {
+ spin_lock(&vi->refill_lock);
+ if (vi->refill_work_enabled)
+ schedule_delayed_work(&vi->refill, 0);
+ spin_unlock(&vi->refill_lock);
+ }
}
u64_stats_update_begin(&rq->stats.syncp);
@@ -1651,6 +1675,8 @@ static int virtnet_open(struct net_device *dev)
struct virtnet_info *vi = netdev_priv(dev);
int i, err;
+ enable_refill_work(vi);
+
for (i = 0; i < vi->max_queue_pairs; i++) {
if (i < vi->curr_queue_pairs)
/* Make sure we have some buffers: if oom use wq. */
@@ -2033,6 +2059,8 @@ static int virtnet_close(struct net_device *dev)
struct virtnet_info *vi = netdev_priv(dev);
int i;
+ /* Make sure NAPI doesn't schedule refill work */
+ disable_refill_work(vi);
/* Make sure refill_work doesn't re-enable napi! */
cancel_delayed_work_sync(&vi->refill);
@@ -2776,6 +2804,9 @@ static void virtnet_freeze_down(struct virtio_device
*vdev)
netif_tx_lock_bh(vi->dev);
netif_device_detach(vi->dev);
netif_tx_unlock_bh(vi->dev);
+ /* Make sure NAPI doesn't schedule refill work */
+ disable_refill_work(vi);
+ /* Make sure refill_work doesn't re-enable napi! */
cancel_delayed_work_sync(&vi->refill);
if (netif_running(vi->dev)) {
@@ -2799,6 +2830,8 @@ static int virtnet_restore_up(struct virtio_device *vdev)
virtio_device_ready(vdev);
+ enable_refill_work(vi);
+
if (netif_running(vi->dev)) {
for (i = 0; i < vi->curr_queue_pairs; i++)
if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL))
@@ -3548,6 +3581,7 @@ static int virtnet_probe(struct virtio_device *vdev)
vdev->priv = vi;
INIT_WORK(&vi->config_work, virtnet_config_changed_work);
+ spin_lock_init(&vi->refill_lock);
/* If we can receive ANY GSO packets, we must allocate large ones. */
if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
--
2.25.1
Michael S. Tsirkin
2022-Jun-29 07:28 UTC
[PATCH] virtio-net: fix the race between refill work and close
On Tue, Jun 28, 2022 at 05:03:24PM +0800, Jason Wang wrote:> We try using cancel_delayed_work_sync() to prevent the work from > enabling NAPI. This is insufficient since we don't disable the the > source the schedulingcan't parse this sentence> of the refill work. This means an NAPIwhat do you mean "an NAPI"? a NAPI poll callback?> after > cancel_delayed_work_sync() can schedule the refill work then can > re-enable the NAPI that leads to use-after-free [1]. > > Since the work can enable NAPI, we can't simply disable NAPI before > calling cancel_delayed_work_sync(). So fix this by introducing a > dedicated boolean to control whether or not the work could be > scheduled from NAPI. > > [1] > =================================================================> BUG: KASAN: use-after-free in refill_work+0x43/0xd4 > Read of size 2 at addr ffff88810562c92e by task kworker/2:1/42 > > CPU: 2 PID: 42 Comm: kworker/2:1 Not tainted 5.19.0-rc1+ #480 > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 > Workqueue: events refill_work > Call Trace: > <TASK> > dump_stack_lvl+0x34/0x44 > print_report.cold+0xbb/0x6ac > ? _printk+0xad/0xde > ? refill_work+0x43/0xd4 > kasan_report+0xa8/0x130 > ? refill_work+0x43/0xd4 > refill_work+0x43/0xd4 > process_one_work+0x43d/0x780 > worker_thread+0x2a0/0x6f0 > ? process_one_work+0x780/0x780 > kthread+0x167/0x1a0 > ? kthread_exit+0x50/0x50 > ret_from_fork+0x22/0x30 > </TASK> > ... > > Fixes: b2baed69e605c ("virtio_net: set/cancel work on ndo_open/ndo_stop") > Signed-off-by: Jason Wang <jasowang at redhat.com> > --- > drivers/net/virtio_net.c | 38 ++++++++++++++++++++++++++++++++++++-- > 1 file changed, 36 insertions(+), 2 deletions(-) > > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c > index db05b5e930be..21bf1e5c81ef 100644 > --- a/drivers/net/virtio_net.c > +++ b/drivers/net/virtio_net.c > @@ -251,6 +251,12 @@ struct virtnet_info { > /* Does the affinity hint is set for virtqueues? */ > bool affinity_hint_set; > > + /* Is refill work enabled? */ > + bool refill_work_enabled; > + > + /* The lock to synchronize the access to refill_work_enabled */ > + spinlock_t refill_lock; > + > /* CPU hotplug instances for online & dead */ > struct hlist_node node; > struct hlist_node node_dead; > @@ -348,6 +354,20 @@ static struct page *get_a_page(struct receive_queue *rq, gfp_t gfp_mask) > return p; > } > > +static void enable_refill_work(struct virtnet_info *vi) > +{ > + spin_lock(&vi->refill_lock); > + vi->refill_work_enabled = true; > + spin_unlock(&vi->refill_lock); > +} > + > +static void disable_refill_work(struct virtnet_info *vi) > +{ > + spin_lock(&vi->refill_lock); > + vi->refill_work_enabled = false; > + spin_unlock(&vi->refill_lock); > +} > + > static void virtqueue_napi_schedule(struct napi_struct *napi, > struct virtqueue *vq) > { > @@ -1527,8 +1547,12 @@ static int virtnet_receive(struct receive_queue *rq, int budget, > } > > if (rq->vq->num_free > min((unsigned int)budget, virtqueue_get_vring_size(rq->vq)) / 2) { > - if (!try_fill_recv(vi, rq, GFP_ATOMIC)) > - schedule_delayed_work(&vi->refill, 0); > + if (!try_fill_recv(vi, rq, GFP_ATOMIC)) { > + spin_lock(&vi->refill_lock); > + if (vi->refill_work_enabled) > + schedule_delayed_work(&vi->refill, 0); > + spin_unlock(&vi->refill_lock); > + } > } > > u64_stats_update_begin(&rq->stats.syncp); > @@ -1651,6 +1675,8 @@ static int virtnet_open(struct net_device *dev) > struct virtnet_info *vi = netdev_priv(dev); > int i, err; > > + enable_refill_work(vi); > + > for (i = 0; i < vi->max_queue_pairs; i++) { > if (i < vi->curr_queue_pairs) > /* Make sure we have some buffers: if oom use wq. */ > @@ -2033,6 +2059,8 @@ static int virtnet_close(struct net_device *dev) > struct virtnet_info *vi = netdev_priv(dev); > int i; > > + /* Make sure NAPI doesn't schedule refill work */ > + disable_refill_work(vi); > /* Make sure refill_work doesn't re-enable napi! */ > cancel_delayed_work_sync(&vi->refill); > > @@ -2776,6 +2804,9 @@ static void virtnet_freeze_down(struct virtio_device *vdev) > netif_tx_lock_bh(vi->dev); > netif_device_detach(vi->dev); > netif_tx_unlock_bh(vi->dev); > + /* Make sure NAPI doesn't schedule refill work */ > + disable_refill_work(vi); > + /* Make sure refill_work doesn't re-enable napi! */ > cancel_delayed_work_sync(&vi->refill); > > if (netif_running(vi->dev)) { > @@ -2799,6 +2830,8 @@ static int virtnet_restore_up(struct virtio_device *vdev) > > virtio_device_ready(vdev); > > + enable_refill_work(vi); > + > if (netif_running(vi->dev)) { > for (i = 0; i < vi->curr_queue_pairs; i++) > if (!try_fill_recv(vi, &vi->rq[i], GFP_KERNEL)) > @@ -3548,6 +3581,7 @@ static int virtnet_probe(struct virtio_device *vdev) > vdev->priv = vi; > > INIT_WORK(&vi->config_work, virtnet_config_changed_work); > + spin_lock_init(&vi->refill_lock); > > /* If we can receive ANY GSO packets, we must allocate large ones. */ > if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||Can't say I love all the extra state but oh well.> -- > 2.25.1