From f7a36b03a7320d1a3ba52f9305571eddad325a05 Mon Sep 17 00:00:00 2001 From: "Michael S. Tsirkin" Date: Mon, 22 Nov 2021 04:32:01 -0500 Subject: [PATCH] vsock/virtio: suppress used length validation It turns out that vhost vsock violates the virtio spec by supplying the out buffer length in the used length (should just be the in length). As a result, attempts to validate the used length fail with: vmw_vsock_virtio_transport virtio1: tx: used len 44 is larger than in buflen 0 Since vsock driver does not use the length fox tx and validates the length before use for rx, it is safe to suppress the validation in virtio core for this driver. Reported-by: Halil Pasic Fixes: 939779f5152d ("virtio_ring: validate used buffer length") Cc: "Jason Wang" Signed-off-by: Michael S. Tsirkin Reviewed-by: Stefano Garzarella Signed-off-by: David S. Miller --- net/vmw_vsock/virtio_transport.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/vmw_vsock/virtio_transport.c b/net/vmw_vsock/virtio_transport.c index 4f7c99dfd16c..3f82b2f1e6dd 100644 --- a/net/vmw_vsock/virtio_transport.c +++ b/net/vmw_vsock/virtio_transport.c @@ -731,6 +731,7 @@ static unsigned int features[] = { static struct virtio_driver virtio_vsock_driver = { .feature_table = features, .feature_table_size = ARRAY_SIZE(features), + .suppress_used_validation = true, .driver.name = KBUILD_MODNAME, .driver.owner = THIS_MODULE, .id_table = id_table,