This is a note to let you know that I've just added the patch titled
virtio/vsock: fix the transport to work with VMADDR_CID_ANY
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
virtio-vsock-fix-the-transport-to-work-with-vmaddr_c.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 42d968e41a83b5ad0e85ccb82e532355dad0b847
Author: Wei Wang <wei.w.wang@xxxxxxxxx>
Date: Thu Nov 25 20:18:23 2021 -0500
virtio/vsock: fix the transport to work with VMADDR_CID_ANY
[ Upstream commit 1db8f5fc2e5c66a5c51e1f6488e0ba7d45c29ae4 ]
The VMADDR_CID_ANY flag used by a socket means that the socket isn't bound
to any specific CID. For example, a host vsock server may want to be bound
with VMADDR_CID_ANY, so that a guest vsock client can connect to the host
server with CID=VMADDR_CID_HOST (i.e. 2), and meanwhile, a host vsock
client can connect to the same local server with CID=VMADDR_CID_LOCAL
(i.e. 1).
The current implementation sets the destination socket's svm_cid to a
fixed CID value after the first client's connection, which isn't an
expected operation. For example, if the guest client first connects to the
host server, the server's svm_cid gets set to VMADDR_CID_HOST, then other
host clients won't be able to connect to the server anymore.
Reproduce steps:
1. Run the host server:
socat VSOCK-LISTEN:1234,fork -
2. Run a guest client to connect to the host server:
socat - VSOCK-CONNECT:2:1234
3. Run a host client to connect to the host server:
socat - VSOCK-CONNECT:1:1234
Without this patch, step 3. above fails to connect, and socat complains
"socat[1720] E connect(5, AF=40 cid:1 port:1234, 16): Connection
reset by peer".
With this patch, the above works well.
Fixes: c0cfa2d8a788 ("vsock: add multi-transports support")
Signed-off-by: Wei Wang <wei.w.wang@xxxxxxxxx>
Link: https://lore.kernel.org/r/20211126011823.1760-1-wei.w.wang@xxxxxxxxx
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
Reviewed-by: Stefano Garzarella <sgarzare@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c
index 902cb6dd710bd..d6d3a05c008a4 100644
--- a/net/vmw_vsock/virtio_transport_common.c
+++ b/net/vmw_vsock/virtio_transport_common.c
@@ -1153,7 +1153,8 @@ void virtio_transport_recv_pkt(struct virtio_transport *t,
space_available = virtio_transport_space_update(sk, pkt);
/* Update CID in case it has changed after a transport reset event */
- vsk->local_addr.svm_cid = dst.svm_cid;
+ if (vsk->local_addr.svm_cid != VMADDR_CID_ANY)
+ vsk->local_addr.svm_cid = dst.svm_cid;
if (space_available)
sk->sk_write_space(sk);
