lkml.org 
[lkml]   [2021]   [Sep]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH v2 4/6] virtio: Initialize authorized attribute for confidential guest
From
Date
+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

\
 
 \ /
  Last update: 2021-09-30 21:18    [W:0.114 / U:0.288 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site