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SubjectRE: [PATCH v7 2/3] scsi: storvsc: Use vmbus_requestor to generate transaction IDs for VMBus hardening
Date
From: Andrea Parri (Microsoft) <parri.andrea@gmail.com> Sent: Monday, September 7, 2020 9:19 AM
>
> From: Andres Beltran <lkmlabelt@gmail.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@gmail.com>
> Co-developed-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com>
> Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com>
> Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>
> Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
> Cc: linux-scsi@vger.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@microsoft.com>

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