netdev - RE: [PATCH v3] hv_netvsc: Add validation for untrusted Hyper-V values

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Message-ID: <DM5PR2101MB093495E2FCC02BF1C0291E57CA210@DM5PR2101MB0934.namprd21.prod.outlook.com>
Date:   Wed, 16 Sep 2020 22:31:38 +0000
From:   Haiyang Zhang <haiyangz@...rosoft.com>
To:     "Andrea Parri (Microsoft)" <parri.andrea@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     KY Srinivasan <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        Andres Beltran <lkmlabelt@...il.com>,
        Michael Kelley <mikelley@...rosoft.com>,
        Saruhan Karademir <skarade@...rosoft.com>,
        Juan Vazquez <juvazq@...rosoft.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH v3] hv_netvsc: Add validation for untrusted Hyper-V values



> -----Original Message-----
> From: Andrea Parri (Microsoft) <parri.andrea@...il.com>
> Sent: Wednesday, September 16, 2020 5:47 AM
> To: linux-kernel@...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>; linux-
> hyperv@...r.kernel.org; Andres Beltran <lkmlabelt@...il.com>; Michael
> Kelley <mikelley@...rosoft.com>; Saruhan Karademir
> <skarade@...rosoft.com>; Juan Vazquez <juvazq@...rosoft.com>; Andrea
> Parri <parri.andrea@...il.com>; David S. Miller <davem@...emloft.net>;
> Jakub Kicinski <kuba@...nel.org>; netdev@...r.kernel.org
> Subject: [PATCH v3] hv_netvsc: Add validation for untrusted Hyper-V values
> 
> From: Andres Beltran <lkmlabelt@...il.com>
> 
> For additional robustness in the face of Hyper-V errors or malicious
> behavior, validate all values that originate from packets that Hyper-V
> has sent to the guest in the host-to-guest ring buffer. Ensure that
> invalid values cannot cause indexing off the end of an array, or
> subvert an existing validation via integer overflow. Ensure that
> outgoing packets do not have any leftover guest memory that has not
> been zeroed out.
> 
> 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: netdev@...r.kernel.org
> ---
> Changes in v3:
>   - Include header size in the estimate for hv_pkt_datalen (Haiyang)
> Changes in v2:
>   - Replace size check on struct nvsp_message with sub-checks (Haiyang)
> 
>  drivers/net/hyperv/hyperv_net.h   |   4 +
>  drivers/net/hyperv/netvsc.c       | 124 ++++++++++++++++++++++++++----
>  drivers/net/hyperv/netvsc_drv.c   |   7 ++
>  drivers/net/hyperv/rndis_filter.c |  73 ++++++++++++++++--
>  4 files changed, 188 insertions(+), 20 deletions(-)

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