[dpdk-stable] [dpdk-dev] [PATCH v2] vhost: fix vring message handling broken in some case

[王志克]

Thanks Maxime. 
Go ahead, your proposal sounds good.

Br,
Zhike Wang 
JDCloud, Product Development, IaaS   
------------------------------------------------------------------------------------------------
Mobile／+86 13466719566
E- mail／wangzhike at jd.com
Address／5F Building A,North-Star Century Center,8 Beichen West Street,Chaoyang District Beijing
Https://JDCloud.com
------------------------------------------------------------------------------------------------



-----Original Message-----
From: Maxime Coquelin [mailto:maxime.coquelin at redhat.com] 
Sent: Thursday, November 14, 2019 4:53 PM
To: Zhike Wang; dev at dpdk.org; stable at dpdk.org; security at dpdk.org
Cc: 王志克
Subject: Re: [dpdk-dev] [PATCH v2] vhost: fix vring message handling broken in some case

Maybe change the title to something like:

vhost: fix vring requests validation broken if no FD in payload

On 11/13/19 12:03 PM, Zhike Wang wrote:
> When VHOST_USER_VRING_NOFD_MASK is set, the fd_num is 0,
> so validate_msg_fds() will return error. In this case,
> the negotiation of vring message between vhost user front end and
> back end would fail, and as a result, vhost user link could NOT be up.
> 
> How to reproduce:
> 1.Run dpdk testpmd insides VM, which locates at host with ovs+dpdk.
> 2.Notice that inside ovs there are endless logs regarding failure to
> handle VHOST_USER_SET_VRING_CALL, and link of vm could NOT be up.
> 
> Fixes: bf47225 ("vhost: fix possible denial of service by leaking FDs")
> Signed-off-by: Zhike Wang <wangzk320 at 163.com>
> ---
>  lib/librte_vhost/vhost_user.c | 13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
> 

otherwise:

Reviewed-by: Maxime Coquelin <maxime.coquelin at redhat.com>

The title can be changed while applying if you agree with it, no need to
send v3.

I'll take care of the different backports.

Thanks,
Maxime