Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Subject: Re: [PATCH v2 4/6] virtio: Initialize authorized attribute for
 confidential guest
From:   "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@linux.intel.com>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     Dan Williams <dan.j.williams@intel.com>,
        "Michael S. Tsirkin" <mst@redhat.com>,
        Borislav Petkov <bp@alien8.de>, X86 ML <x86@kernel.org>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>,
        Andreas Noever <andreas.noever@gmail.com>,
        Michael Jamet <michael.jamet@intel.com>,
        Yehezkel Bernat <YehezkelShB@gmail.com>,
        "Rafael J . Wysocki" <rafael@kernel.org>,
        Mika Westerberg <mika.westerberg@linux.intel.com>,
        Jonathan Corbet <corbet@lwn.net>,
        Jason Wang <jasowang@redhat.com>,
        Andi Kleen <ak@linux.intel.com>,
        Kuppuswamy Sathyanarayanan <knsathya@kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Linux PCI <linux-pci@vger.kernel.org>,
        USB list <linux-usb@vger.kernel.org>,
        virtualization@lists.linux-foundation.org,
        "Reshetova, Elena" <elena.reshetova@intel.com>
References: <20210930010511.3387967-1-sathyanarayanan.kuppuswamy@linux.intel.com>
 <20210930010511.3387967-5-sathyanarayanan.kuppuswamy@linux.intel.com>
 <20210930065953-mutt-send-email-mst@kernel.org>
 <CAPcyv4hP6mtzKS-CVb-aKf-kYuiLM771PMxN2zeBEfoj6NbctA@mail.gmail.com>
 <6d1e2701-5095-d110-3b0a-2697abd0c489@linux.intel.com>
 <YVXWaF73gcrlvpnf@kroah.com>
 <1cfdce51-6bb4-f7af-a86b-5854b6737253@linux.intel.com>
Message-ID: <2ead1b1a-f5d2-f89c-b94f-071fdb99094b@linux.intel.com>
Date:   Thu, 30 Sep 2021 12:16:55 -0700
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101
 Firefox/78.0 Thunderbird/78.13.0
MIME-Version: 1.0
In-Reply-To: <1cfdce51-6bb4-f7af-a86b-5854b6737253@linux.intel.com>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Precedence: bulk

+Elena

On 9/30/21 12:04 PM, Kuppuswamy, Sathyanarayanan wrote:
> 
> 
> On 9/30/21 8:23 AM, Greg Kroah-Hartman wrote:
>> On Thu, Sep 30, 2021 at 08:18:18AM -0700, Kuppuswamy, Sathyanarayanan wrote:
>>>
>>>
>>> On 9/30/21 6:36 AM, Dan Williams wrote:
>>>>> And in particular, not all virtio drivers are hardened -
>>>>> I think at this point blk and scsi drivers have been hardened - so
>>>>> treating them all the same looks wrong.
>>>> My understanding was that they have been audited, Sathya?
>>>
>>> Yes, AFAIK, it has been audited. Andi also submitted some patches
>>> related to it. Andi, can you confirm.
>>
>> What is the official definition of "audited"?
> 
> 
> In our case (Confidential Computing platform), the host is an un-trusted
> entity. So any interaction with host from the drivers will have to be
> protected against the possible attack from the host. For example, if we
> are accessing a memory based on index value received from host, we have
> to make sure it does not lead to out of bound access or when sharing the
> memory with the host, we need to make sure only the required region is
> shared with the host and the memory is un-shared after use properly.
> 
> Elena can share more details, but it was achieved with static analysis
> and fuzzing. Here is a presentation she is sharing about the work at the
> Linux Security Summit:
> https://static.sched.com/hosted_files/lssna2021/b6/LSS-HardeningLinuxGuestForCCC.pdf
> 
> Andi, can talk more about the specific driver changes that came out of this
> effort.
> 
> In our case the driver is considered "hardened" / "audited" if it can handle
> the above scenarios.
> 
>>
>> thanks,
>>
>> greg k-h
>>
> 

-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer