From: Eugenio Perez Martin <eperezma@redhat.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: linux-kernel@vger.kernel.org,
syzbot+6c21aeb59d0e82eb2782@syzkaller.appspotmail.com,
Jeongjun Park <aha310510@gmail.com>,
Arseny Krasnov <arseny.krasnov@kaspersky.com>,
"David S . Miller" <davem@davemloft.net>,
Stefan Hajnoczi <stefanha@redhat.com>,
Stefano Garzarella <sgarzare@redhat.com>,
Jason Wang <jasowang@redhat.com>,
kvm@vger.kernel.org, virtualization@lists.linux.dev,
netdev@vger.kernel.org
Subject: Re: [PATCH] vhost/vsock: always initialize seqpacket_allow
Date: Thu, 16 May 2024 15:37:42 +0200 [thread overview]
Message-ID: <CAJaqyWd9-fhrxBv3gTq82bGnSVdC_vw_LXg+XVNHT3B6cD0VOg@mail.gmail.com> (raw)
In-Reply-To: <bcc17a060d93b198d8a17a9b87b593f41337ee28.1715785488.git.mst@redhat.com>
On Wed, May 15, 2024 at 5:05 PM Michael S. Tsirkin <mst@redhat.com> 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@syzkaller.appspotmail.com
> Reported-by: Jeongjun Park <aha310510@gmail.com>
> Fixes: ced7b713711f ("vhost/vsock: support SEQPACKET for transport").
> Cc: Arseny Krasnov <arseny.krasnov@kaspersky.com>
> Cc: David S. Miller <davem@davemloft.net>
> Cc: Stefan Hajnoczi <stefanha@redhat.com>
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> Acked-by: Arseniy Krasnov <avkrasnov@salutedevices.com>
> Tested-by: Arseniy Krasnov <avkrasnov@salutedevices.com>
>
Reviewed-by: Eugenio Pérez <eperezma@redhat.com>
Thanks!
> ---
>
>
> Reposting now it's been tested.
>
> drivers/vhost/vsock.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
> index ec20ecff85c7..bf664ec9341b 100644
> --- a/drivers/vhost/vsock.c
> +++ b/drivers/vhost/vsock.c
> @@ -667,6 +667,7 @@ static int vhost_vsock_dev_open(struct inode *inode, struct file *file)
> }
>
> vsock->guest_cid = 0; /* no CID assigned yet */
> + vsock->seqpacket_allow = false;
>
> atomic_set(&vsock->queued_replies, 0);
>
> @@ -810,8 +811,7 @@ static int vhost_vsock_set_features(struct vhost_vsock *vsock, u64 features)
> goto err;
> }
>
> - if (features & (1ULL << VIRTIO_VSOCK_F_SEQPACKET))
> - vsock->seqpacket_allow = true;
> + vsock->seqpacket_allow = features & (1ULL << VIRTIO_VSOCK_F_SEQPACKET);
>
> for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) {
> vq = &vsock->vqs[i];
> --
> MST
>
next prev parent reply other threads:[~2024-05-16 13:38 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-15 15:05 [PATCH] vhost/vsock: always initialize seqpacket_allow Michael S. Tsirkin
2024-05-16 5:03 ` Jason Wang
2024-05-16 8:09 ` Stefano Garzarella
2024-05-16 13:37 ` Eugenio Perez Martin [this message]
2024-05-17 2:37 ` Jakub Kicinski
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