linux-kernel - RE: [PATCH v6 1/3] Drivers: hv: vmbus: Add vmbus_requestor data structure for VMBus hardening

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Message-ID: <MW2PR2101MB1052AD4F70F592E57AA20DEAD7760@MW2PR2101MB1052.namprd21.prod.outlook.com>
Date:   Thu, 23 Jul 2020 01:24:03 +0000
From:   Michael Kelley <mikelley@...rosoft.com>
To:     Andres Beltran <lkmlabelt@...il.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>
CC:     "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "parri.andrea@...il.com" <parri.andrea@...il.com>
Subject: RE: [PATCH v6 1/3] Drivers: hv: vmbus: Add vmbus_requestor data
 structure for VMBus hardening

From: Andres Beltran <lkmlabelt@...il.com> Sent: Wednesday, July 22, 2020 3:39 PM
> 
> Currently, VMbus drivers use pointers into guest memory as request IDs
> for interactions with Hyper-V. To be more robust in the face of errors
> or malicious behavior from a compromised Hyper-V, avoid exposing
> guest memory addresses to Hyper-V. Also avoid Hyper-V giving back a
> bad request ID that is then treated as the address of a guest data
> structure with no validation. Instead, encapsulate these memory
> addresses and provide small integers as request IDs.
> 
> Signed-off-by: Andres Beltran <lkmlabelt@...il.com>
> ---
> Changes in v6:
> 	- Offset request IDs by 1 keeping the original initialization
> 	  code.
> Changes in v5:
>         - Add support for unsolicited messages sent by the host with a
>           request ID of 0.
> Changes in v4:
>         - Use channel->rqstor_size to check if rqstor has been
>           initialized.
> Changes in v3:
>         - Check that requestor has been initialized in
>           vmbus_next_request_id() and vmbus_request_addr().
> Changes in v2:
>         - Get rid of "rqstor" variable in __vmbus_open().
> 
>  drivers/hv/channel.c   | 170 +++++++++++++++++++++++++++++++++++++++++
>  include/linux/hyperv.h |  21 +++++
>  2 files changed, 191 insertions(+)

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