linux-kernel - Re: [PATCH V2 0/4] Prevent vhost kthread from hogging CPU

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Message-ID: <20190520085207-mutt-send-email-mst@kernel.org>
Date:   Mon, 20 May 2019 08:52:59 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        pbonzini@...hat.com, stefanha@...hat.com
Subject: Re: [PATCH V2 0/4] Prevent vhost kthread from hogging CPU

On Fri, May 17, 2019 at 12:29:48AM -0400, Jason Wang wrote:
> Hi:
> 
> This series try to prevent a guest triggerable CPU hogging through
> vhost kthread. This is done by introducing and checking the weight
> after each requrest. The patch has been tested with reproducer of
> vsock and virtio-net. Only compile test is done for vhost-scsi.
> 
> Please review.
> This addresses CVE-2019-3900.

OK I think we should clean this code some more but given
it's a CVE fix maybe it's best to do as a patch on top.

Acked-by: Michael S. Tsirkin <mst@...hat.com>

Dave do you want to merge this or should I?

> 
> Changs from V1:
> - fix user-ater-free in vosck patch
> 
> Jason Wang (4):
>   vhost: introduce vhost_exceeds_weight()
>   vhost_net: fix possible infinite loop
>   vhost: vsock: add weight support
>   vhost: scsi: add weight support
> 
>  drivers/vhost/net.c   | 41 ++++++++++++++---------------------------
>  drivers/vhost/scsi.c  | 21 ++++++++++++++-------
>  drivers/vhost/vhost.c | 20 +++++++++++++++++++-
>  drivers/vhost/vhost.h |  5 ++++-
>  drivers/vhost/vsock.c | 28 +++++++++++++++++++++-------
>  5 files changed, 72 insertions(+), 43 deletions(-)
> 
> -- 
> 1.8.3.1