linux-kernel - Re: [PATCH] vhost/vsock: always initialize seqpacket

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Date: Thu, 16 May 2024 10:09:56 +0200
From: Stefano Garzarella <sgarzare@...hat.com>
To: "Michael S. Tsirkin" <mst@...hat.com>
Cc: linux-kernel@...r.kernel.org, 
	syzbot+6c21aeb59d0e82eb2782@...kaller.appspotmail.com, Jeongjun Park <aha310510@...il.com>, 
	Arseny Krasnov <arseny.krasnov@...persky.com>, "David S . Miller" <davem@...emloft.net>, 
	Stefan Hajnoczi <stefanha@...hat.com>, Jason Wang <jasowang@...hat.com>, 
	Eugenio Pérez <eperezma@...hat.com>, kvm@...r.kernel.org, virtualization@...ts.linux.dev, 
	netdev@...r.kernel.org
Subject: Re: [PATCH] vhost/vsock: always initialize seqpacket_allow

On Wed, May 15, 2024 at 11:05:43AM GMT, Michael S. Tsirkin wrote:
>There are two issues around seqpacket_allow:
>1. seqpacket_allow is not initialized when socket is
>   created. Thus if features are never set, it will be
>   read uninitialized.
>2. if VIRTIO_VSOCK_F_SEQPACKET is set and then cleared,
>   then seqpacket_allow will not be cleared appropriately
>   (existing apps I know about don't usually do this but
>    it's legal and there's no way to be sure no one relies
>    on this).
>
>To fix:
>	- initialize seqpacket_allow after allocation
>	- set it unconditionally in set_features
>
>Reported-by: syzbot+6c21aeb59d0e82eb2782@...kaller.appspotmail.com
>Reported-by: Jeongjun Park <aha310510@...il.com>
>Fixes: ced7b713711f ("vhost/vsock: support SEQPACKET for transport").
>Cc: Arseny Krasnov <arseny.krasnov@...persky.com>
>Cc: David S. Miller <davem@...emloft.net>
>Cc: Stefan Hajnoczi <stefanha@...hat.com>
>Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
>Acked-by: Arseniy Krasnov <avkrasnov@...utedevices.com>
>Tested-by: Arseniy Krasnov <avkrasnov@...utedevices.com>
>
>---
>
>
>Reposting now it's been tested.
>
> drivers/vhost/vsock.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)

Thanks for fixing this issue!

Reviewed-by: Stefano Garzarella <sgarzare@...hat.com>