netdev - RE: [PATCH v3] Drivers: hv: vmbus: Copy packets sent by Hyper-V out of the ring buffer

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Message-ID: <MW2PR2101MB10523546B825880C298E1C64D7DF9@MW2PR2101MB1052.namprd21.prod.outlook.com>
Date:   Tue, 22 Dec 2020 13:59:34 +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>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...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>,
        Juan Vazquez <juvazq@...rosoft.com>,
        Saruhan Karademir <skarade@...rosoft.com>,
        Andres Beltran <lkmlabelt@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
Subject: RE: [PATCH v3] Drivers: hv: vmbus: Copy packets sent by Hyper-V out
 of the ring buffer

From: Andrea Parri (Microsoft) <parri.andrea@...il.com> Sent: Monday, December 7, 2020 8:53 PM
> 
> From: Andres Beltran <lkmlabelt@...il.com>
> 
> Pointers to ring-buffer packets sent by Hyper-V are used within the
> guest VM. Hyper-V can send packets with erroneous values or modify
> packet fields after they are processed by the guest. To defend
> against these scenarios, return a copy of the incoming VMBus packet
> after validating its length and offset fields in hv_pkt_iter_first().
> In this way, the packet can no longer be modified by the host.
> 
> 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: "David S. Miller" <davem@...emloft.net>
> Cc: Jakub Kicinski <kuba@...nel.org>
> Cc: "James E.J. Bottomley" <jejb@...ux.ibm.com>
> Cc: "Martin K. Petersen" <martin.petersen@...cle.com>
> Cc: netdev@...r.kernel.org
> Cc: linux-scsi@...r.kernel.org
> ---
>  drivers/hv/channel.c              |  9 ++--
>  drivers/hv/hv_fcopy.c             |  1 +
>  drivers/hv/hv_kvp.c               |  1 +
>  drivers/hv/hyperv_vmbus.h         |  2 +-
>  drivers/hv/ring_buffer.c          | 82 ++++++++++++++++++++++++++-----
>  drivers/net/hyperv/hyperv_net.h   |  3 ++
>  drivers/net/hyperv/netvsc.c       |  2 +
>  drivers/net/hyperv/rndis_filter.c |  2 +
>  drivers/scsi/storvsc_drv.c        | 10 ++++
>  include/linux/hyperv.h            | 48 +++++++++++++++---
>  net/vmw_vsock/hyperv_transport.c  |  4 +-
>  11 files changed, 139 insertions(+), 25 deletions(-)
> 

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