vhost: reset metadata cache when initializing new IOTLB
[ Upstream commitpull/10/headb13f9c6364
] We need to reset metadata cache during new IOTLB initialization, otherwise the stale pointers to previous IOTLB may be still accessed which will lead a use after free. Reported-by: syzbot+c51e6736a1bf614b3272@syzkaller.appspotmail.com Fixes:f889491380
("vhost: introduce O(1) vq metadata cache") Signed-off-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
parent
e125b1cc67
commit
59f9f2c76f
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@ -1578,9 +1578,12 @@ int vhost_init_device_iotlb(struct vhost_dev *d, bool enabled)
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d->iotlb = niotlb;
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for (i = 0; i < d->nvqs; ++i) {
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mutex_lock(&d->vqs[i]->mutex);
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d->vqs[i]->iotlb = niotlb;
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mutex_unlock(&d->vqs[i]->mutex);
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struct vhost_virtqueue *vq = d->vqs[i];
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mutex_lock(&vq->mutex);
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vq->iotlb = niotlb;
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__vhost_vq_meta_reset(vq);
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mutex_unlock(&vq->mutex);
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}
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vhost_umem_clean(oiotlb);
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