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From: Juergen Gross <jgross@suse.com>
To: xen-devel@lists.xenproject.org, linux-block@vger.kernel.org,
	linux-kernel@vger.kernel.org
Cc: "Boris Ostrovsky" <boris.ostrovsky@oracle.com>,
	"Stefano Stabellini" <sstabellini@kernel.org>,
	"Konrad Rzeszutek Wilk" <konrad.wilk@oracle.com>,
	"Roger Pau Monné" <roger.pau@citrix.com>,
	"Jens Axboe" <axboe@kernel.dk>
Subject: Re: [PATCH v2 3/3] xen/blkfront: don't trust the backend response data blindly
Date: Fri, 30 Jul 2021 12:31:07 +0200	[thread overview]
Message-ID: <68a2de1d-e377-61b0-6c69-5391ef95dbcd@suse.com> (raw)
In-Reply-To: <9ef58781-bd7d-48bc-2b59-bb71d2ba83b8@suse.com>


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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@suse.com>
> 
> Any comments for this patch?

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


Juergen

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  reply	other threads:[~2021-07-30 10:31 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-08 12:43 [PATCH v2 0/3] xen: harden blkfront against malicious backends Juergen Gross
2021-07-08 12:43 ` [PATCH v2 1/3] xen/blkfront: read response from backend only once Juergen Gross
2021-07-09  8:33   ` Roger Pau Monné
2021-07-08 12:43 ` [PATCH v2 2/3] xen/blkfront: don't take local copy of a request from the ring page Juergen Gross
2021-07-09  8:55   ` Roger Pau Monné
2021-07-09 13:54     ` Juergen Gross
2021-07-08 12:43 ` [PATCH v2 3/3] xen/blkfront: don't trust the backend response data blindly Juergen Gross
2021-07-08 13:11   ` Jan Beulich
2021-07-08 13:14     ` Juergen Gross
2021-07-09  9:42   ` Roger Pau Monné
2021-07-09 13:58     ` Juergen Gross
2021-07-09 11:09   ` kernel test robot
2021-07-30 10:08   ` Juergen Gross
2021-07-30 10:31     ` Juergen Gross [this message]
2021-07-08 14:22 ` [PATCH v2 0/3] xen: harden blkfront against malicious backends Konrad Rzeszutek Wilk
2021-07-08 14:39   ` Juergen Gross
2021-07-10  1:18     ` Marek Marczykowski-Górecki

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