linux-kernel - RE: [PATCH v7 2/3] scsi: storvsc: Use vmbus_requestor to generate transaction IDs for VMBus hardening

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Message-ID: <MW2PR2101MB1052AAF2FB35646D03B1BF31D7280@MW2PR2101MB1052.namprd21.prod.outlook.com>
Date:   Mon, 7 Sep 2020 22:02:03 +0000
From:   Michael Kelley <mikelley@...rosoft.com>
To:     "Andrea Parri (Microsoft)" <parri.andrea@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        Andres Beltran <lkmlabelt@...il.com>,
        Saruhan Karademir <skarade@...rosoft.com>,
        Juan Vazquez <juvazq@...rosoft.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
Subject: RE: [PATCH v7 2/3] scsi: storvsc: Use vmbus_requestor to generate
 transaction IDs for VMBus hardening

From: Andrea Parri (Microsoft) <parri.andrea@...il.com> Sent: Monday, September 7, 2020 9:19 AM
> 
> From: Andres Beltran <lkmlabelt@...il.com>
> 
> Currently, pointers to guest memory are passed to Hyper-V as
> transaction IDs in storvsc. In the face of errors or malicious
> behavior in Hyper-V, storvsc should not expose or trust the transaction
> IDs returned by Hyper-V to be valid guest memory addresses. Instead,
> use small integers generated by vmbus_requestor as requests
> (transaction) IDs.
> 
> Signed-off-by: Andres Beltran <lkmlabelt@...il.com>
> Co-developed-by: Andrea Parri (Microsoft) <parri.andrea@...il.com>
> Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@...il.com>
> Cc: "James E.J. Bottomley" <jejb@...ux.ibm.com>
> Cc: "Martin K. Petersen" <martin.petersen@...cle.com>
> Cc: linux-scsi@...r.kernel.org
> ---
> Changes in v7:
> 	- Move the allocation of the request ID after the data has been
> 	  copied into the ring buffer (cf. 1/3).
> Changes in v2:
>         - Add casts to unsigned long to fix warnings on 32bit.
> 
>  drivers/scsi/storvsc_drv.c | 26 +++++++++++++++++++++++---
>  1 file changed, 23 insertions(+), 3 deletions(-)
> 

Reviewed-by: Michael Kelley <mikelley@...rosoft.com>