linux-kernel - Re: [PATCH v1 1/8] virtio: Force only split mode with protected guest

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <93f58cfd-be59-1ea6-e0d0-6840c14d6980@redhat.com>
Date:   Fri, 4 Jun 2021 10:29:47 +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 1/8] virtio: Force only split mode with protected guest


在 2021/6/3 下午9:55, Andi Kleen 写道:
>
>> Ok, but what I meant is this, if we don't read from the descriptor 
>> ring, and validate all the other metadata supplied by the device 
>> (used id and len). Then there should be no way for the device to 
>> suppress the dma flags to write to the indirect descriptor table.
>>
>> Or do you have an example how it can do that?
>
> I don't. If you can validate everything it's probably ok
>
> The only drawback is even more code to audit and test.
>
> -Andi
>
>

Ok, then I'm going to post a formal series, please have a look and we 
can start from there.

Thanks