From: Wei Liu <wei.liu@kernel.org>
To: Andres Beltran <lkmlabelt@gmail.com>
Cc: kys@microsoft.com, haiyangz@microsoft.com,
sthemmin@microsoft.com, wei.liu@kernel.org,
linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org,
mikelley@microsoft.com, parri.andrea@gmail.com,
linux-scsi@vger.kernel.org, netdev@vger.kernel.org,
"James E.J. Bottomley" <jejb@linux.ibm.com>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>
Subject: Re: [PATCH 0/3] Drivers: hv: vmbus: vmbus_requestor data structure
Date: Fri, 26 Jun 2020 13:42:27 +0000 [thread overview]
Message-ID: <20200626134227.ka4aghqjpktdupnu@liuwe-devbox-debian-v2> (raw)
In-Reply-To: <20200625153723.8428-1-lkmlabelt@gmail.com>
On Thu, Jun 25, 2020 at 11:37:20AM -0400, Andres Beltran wrote:
> From: Andres Beltran (Microsoft) <lkmlabelt@gmail.com>
>
> 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.
>
> The first patch creates the definitions for the data structure, provides
> helper methods to generate new IDs and retrieve data, and
> allocates/frees the memory needed for vmbus_requestor.
>
> The second and third patches make use of vmbus_requestor to send request
> IDs to Hyper-V in storvsc and netvsc respectively.
>
Per my understanding, this new data structure is per-channel, so it
won't introduce contention on the lock in multi-queue scenario. Have you
done any testing to confirm there is no severe performance regression?
Wei.
> Thanks.
> Andres Beltran
>
> Cc: linux-scsi@vger.kernel.org
> Cc: netdev@vger.kernel.org
> Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>
> Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Jakub Kicinski <kuba@kernel.org>
>
> Andres Beltran (3):
> Drivers: hv: vmbus: Add vmbus_requestor data structure for VMBus
> hardening
> scsi: storvsc: Use vmbus_requestor to generate transaction ids for
> VMBus hardening
> hv_netvsc: Use vmbus_requestor to generate transaction ids for VMBus
> hardening
>
> drivers/hv/channel.c | 150 ++++++++++++++++++++++++++++++
> drivers/net/hyperv/hyperv_net.h | 10 ++
> drivers/net/hyperv/netvsc.c | 56 +++++++++--
> drivers/net/hyperv/rndis_filter.c | 1 +
> drivers/scsi/storvsc_drv.c | 62 ++++++++++--
> include/linux/hyperv.h | 22 +++++
> 6 files changed, 283 insertions(+), 18 deletions(-)
>
> --
> 2.25.1
>
next prev parent reply other threads:[~2020-06-26 13:42 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-25 15:37 [PATCH 0/3] Drivers: hv: vmbus: vmbus_requestor data structure Andres Beltran
2020-06-25 15:37 ` [PATCH 1/3] Drivers: hv: vmbus: Add vmbus_requestor data structure for VMBus hardening Andres Beltran
2020-06-26 13:19 ` Wei Liu
2020-06-25 15:37 ` [PATCH 2/3] scsi: storvsc: Use vmbus_requestor to generate transaction IDs " Andres Beltran
2020-06-26 13:35 ` Wei Liu
2020-06-25 15:37 ` [PATCH 3/3] hv_netvsc: " Andres Beltran
2020-06-25 18:57 ` Haiyang Zhang
2020-06-25 18:22 ` [PATCH 0/3] Drivers: hv: vmbus: vmbus_requestor data structure Andrea Parri
2020-06-26 13:42 ` Wei Liu [this message]
2020-06-26 14:48 ` Andrea Parri
2020-06-26 20:57 ` Wei Liu
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