linux-kernel - Re: [PATCH v7 05/12] virtio_scsi: Add validation for residual bytes from response

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Date:   Wed, 26 May 2021 10:41:36 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Xie Yongji <xieyongji@...edance.com>, mst@...hat.com,
        stefanha@...hat.com, sgarzare@...hat.com, parav@...dia.com,
        hch@...radead.org, christian.brauner@...onical.com,
        rdunlap@...radead.org, willy@...radead.org,
        viro@...iv.linux.org.uk, axboe@...nel.dk, bcrl@...ck.org,
        corbet@....net, mika.penttila@...tfour.com,
        dan.carpenter@...cle.com, joro@...tes.org
Cc:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        kvm@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 05/12] virtio_scsi: Add validation for residual bytes
 from response


在 2021/5/17 下午5:55, Xie Yongji 写道:
> This ensures that the residual bytes in response (might come
> from an untrusted device) will not exceed the data buffer length.
>
> Signed-off-by: Xie Yongji <xieyongji@...edance.com>
> ---
>   drivers/scsi/virtio_scsi.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
> index efcaf0674c8d..ad7d8cecec32 100644
> --- a/drivers/scsi/virtio_scsi.c
> +++ b/drivers/scsi/virtio_scsi.c
> @@ -97,7 +97,7 @@ static inline struct Scsi_Host *virtio_scsi_host(struct virtio_device *vdev)
>   static void virtscsi_compute_resid(struct scsi_cmnd *sc, u32 resid)
>   {
>   	if (resid)
> -		scsi_set_resid(sc, resid);
> +		scsi_set_resid(sc, min(resid, scsi_bufflen(sc)));
>   }
>   
>   /*


Acked-by: Jason Wang <jasowang@...hat.com>