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From: Andres Beltran <lkmlabelt@gmail.com>
To: Michael Kelley <mikelley@microsoft.com>
Cc: Wei Liu <wei.liu@kernel.org>,
	Andres Beltran <t-mabelt@microsoft.com>,
	KY Srinivasan <kys@microsoft.com>,
	Haiyang Zhang <haiyangz@microsoft.com>,
	Stephen Hemminger <sthemmin@microsoft.com>,
	"linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Andrea Parri <parri.andrea@gmail.com>
Subject: Re: [PATCH v2 1/3] Drivers: hv: vmbus: Add vmbus_requestor data structure for VMBus hardening
Date: Mon, 29 Jun 2020 18:09:06 -0400
Message-ID: <CAGpZZ6tjc0Zzdpt+OFznAFU2NbAt5=7nvRyDmL_phSbnDM_eYA@mail.gmail.com> (raw)
In-Reply-To: <MW2PR2101MB1052D0B7884A022D2DB6BED2D76E0@MW2PR2101MB1052.namprd21.prod.outlook.com>

On Mon, Jun 29, 2020 at 5:56 PM Michael Kelley <mikelley@microsoft.com> wrote:
> I'm not understanding the problem here.  Any VMbus driver that uses
> this requestID allocation mechanism must set newchannel->rqstor_size
> to a non-zero value.  But if a VMbus driver doesn't use the mechanism,
> then newchannel->rqstor_size will default to zero, and the mechanism
> will not be initialized for the channels used by that driver.  I think the
> cleanup of the mechanism handles the case where it wasn't ever
> initialized.  Or am I missing something?
>
> Michael

Yes, that is correct. I think the validation is necessary if there
exists an instance
where a driver call vmbus_next_request_id or vmbus_request_addr() with a rqstor
that has not been previously initialized. Currently, the rqstor
pointer is not being
validated in these 2 functions, because we assume that the driver has
initialized the
array with a non-zero value before calling next_id() or request_addr().

Andres.

  reply index

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-29 20:02 [PATCH v2 0/3] Drivers: hv: vmbus: " Andres Beltran
2020-06-29 20:02 ` [PATCH v2 1/3] Drivers: hv: vmbus: Add " Andres Beltran
2020-06-29 20:46   ` Wei Liu
2020-06-29 21:51     ` Andres Beltran
2020-06-29 21:56       ` Michael Kelley
2020-06-29 22:09         ` Andres Beltran [this message]
2020-06-29 22:15         ` Wei Liu
2020-06-29 22:20       ` Wei Liu
2020-06-29 23:45         ` Andres Beltran
2020-06-30 10:09           ` Wei Liu
2020-06-30 10:17             ` Wei Liu
2020-06-30 10:48               ` Wei Liu
2020-06-29 20:02 ` [PATCH v2 2/3] scsi: storvsc: Use vmbus_requestor to generate transaction IDs " Andres Beltran
2020-06-29 20:02 ` [PATCH v2 3/3] hv_netvsc: " Andres Beltran
2020-06-29 21:33   ` Haiyang Zhang
2020-06-29 22:26     ` Wei Liu

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