netdev - RE: [PATCH v2 3/3] hv_netvsc: Use vmbus_requestor to generate transaction IDs for VMBus hardening

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Message-ID: <BL0PR2101MB0930DB73E3B5A89DD3E55481CA6E0@BL0PR2101MB0930.namprd21.prod.outlook.com>
Date:   Mon, 29 Jun 2020 21:33:15 +0000
From:   Haiyang Zhang <haiyangz@...rosoft.com>
To:     Andres Beltran <t-mabelt@...rosoft.com>,
        KY Srinivasan <kys@...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>,
        Michael Kelley <mikelley@...rosoft.com>,
        "parri.andrea@...il.com" <parri.andrea@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH v2 3/3] hv_netvsc: Use vmbus_requestor to generate
 transaction IDs for VMBus hardening



> -----Original Message-----
> From: Andres Beltran <lkmlabelt@...il.com>
> Sent: Monday, June 29, 2020 4:02 PM
> To: KY Srinivasan <kys@...rosoft.com>; Haiyang Zhang
> <haiyangz@...rosoft.com>; Stephen Hemminger <sthemmin@...rosoft.com>;
> wei.liu@...nel.org
> Cc: linux-hyperv@...r.kernel.org; linux-kernel@...r.kernel.org; Michael
> Kelley <mikelley@...rosoft.com>; parri.andrea@...il.com; Andres Beltran
> <lkmlabelt@...il.com>; David S . Miller <davem@...emloft.net>; Jakub
> Kicinski <kuba@...nel.org>; netdev@...r.kernel.org
> Subject: [PATCH v2 3/3] hv_netvsc: Use vmbus_requestor to generate
> transaction IDs for VMBus hardening
> 
> Currently, pointers to guest memory are passed to Hyper-V as
> transaction IDs in netvsc. In the face of errors or malicious
> behavior in Hyper-V, netvsc 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.
> 
> Cc: David S. Miller <davem@...emloft.net>
> Cc: Jakub Kicinski <kuba@...nel.org>
> Cc: netdev@...r.kernel.org
> Signed-off-by: Andres Beltran <lkmlabelt@...il.com>

Reviewed-by: Haiyang Zhang <haiyangz@...rosoft.com>