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Message-Id: <4C39A362-74E3-4762-82AD-D8B15AA38B10@gmail.com>
Date: Thu, 27 Jun 2024 12:37:24 +0900
From: 박정준 <aha310510@...il.com>
To: "Michael S. Tsirkin" <mst@...hat.com>
Cc: linux-kernel@...r.kernel.org,
syzbot+6c21aeb59d0e82eb2782@...kaller.appspotmail.com,
Arseny Krasnov <arseny.krasnov@...persky.com>,
"David S . Miller" <davem@...emloft.net>,
Stefan Hajnoczi <stefanha@...hat.com>,
Stefano Garzarella <sgarzare@...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
nice patch
> 2024. 5. 16. 오전 12:05, Michael S. Tsirkin <mst@...hat.com> 작성:
>
> 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(-)
>
> 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
>
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