linux-kernel - Re: [PATCH v2 3/3] xen/blkfront: don't trust the backend response data blindly

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Message-ID: <68a2de1d-e377-61b0-6c69-5391ef95dbcd@suse.com>
Date:   Fri, 30 Jul 2021 12:31:07 +0200
From:   Juergen Gross <jgross@...e.com>
To:     xen-devel@...ts.xenproject.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Roger Pau Monné <roger.pau@...rix.com>,
        Jens Axboe <axboe@...nel.dk>
Subject: Re: [PATCH v2 3/3] xen/blkfront: don't trust the backend response
 data blindly

On 30.07.21 12:08, Juergen Gross wrote:
> On 08.07.21 14:43, Juergen Gross wrote:
>> Today blkfront will trust the backend to send only sane response data.
>> In order to avoid privilege escalations or crashes in case of malicious
>> backends verify the data to be within expected limits. Especially make
>> sure that the response always references an outstanding request.
>>
>> Introduce a new state of the ring BLKIF_STATE_ERROR which will be
>> switched to in case an inconsistency is being detected. Recovering from
>> this state is possible only via removing and adding the virtual device
>> again (e.g. via a suspend/resume cycle).
>>
>> Signed-off-by: Juergen Gross <jgross@...e.com>
> 
> Any comments for this patch?

Please ignore this request for comments, I already got some.


Juergen

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