linux-kernel - Re: [PATCH v1 2/8] virtio: Add boundary checks to virtio ring

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Date:   Thu, 3 Jun 2021 10:36:47 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Andi Kleen <ak@...ux.intel.com>, mst@...hat.com
Cc:     virtualization@...ts.linux-foundation.org, hch@....de,
        m.szyprowski@...sung.com, robin.murphy@....com,
        iommu@...ts.linux-foundation.org, x86@...nel.org,
        sathyanarayanan.kuppuswamy@...ux.intel.com, jpoimboe@...hat.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/8] virtio: Add boundary checks to virtio ring


在 2021/6/3 上午10:18, Andi Kleen 写道:
>
>> It looks to me all the evils came from the fact that we depends on 
>> the descriptor ring.
>>
>> So the checks in this patch could is unnecessary if we don't even 
>> read from the descriptor ring which could be manipulated by the device.
>>
>> This is what my series tries to achieve:
>>
>> https://www.spinics.net/lists/kvm/msg241825.html
>
> I would argue that you should boundary check in any case. It was 
> always a bug to not have boundary checks in such a data structure with 
> multiple users, trust or not.
>
> But yes your patch series is interesting and definitely makes sense 
> for TDX too.
>
> Best would be to have both I guess, and always check the boundaries 
> everywhere.


I agree but some of the checks are unnecessary in we do this series on 
top of my series.


>
> So what's the merge status of your series?


If I understand correctly from Michael, I will send a formal series and 
he will try to merge it for the 5.14.

Thanks


>
> -Andi
>
>