netdev - Re: [PATCH v2] hv_netvsc: Add (more) validation for untrusted Hyper-V values

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Message-ID: <20210115203022.7005e66a@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Fri, 15 Jan 2021 20:30:22 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     "Andrea Parri (Microsoft)" <parri.andrea@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        "K . Y . Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>,
        Michael Kelley <mikelley@...rosoft.com>,
        Saruhan Karademir <skarade@...rosoft.com>,
        Juan Vazquez <juvazq@...rosoft.com>,
        linux-hyperv@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH v2] hv_netvsc: Add (more) validation for untrusted
 Hyper-V values

On Thu, 14 Jan 2021 21:26:28 +0100 Andrea Parri (Microsoft) wrote:
> 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.  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.
> 
> Reported-by: Juan Vazquez <juvazq@...rosoft.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: Alexei Starovoitov <ast@...nel.org>
> Cc: Daniel Borkmann <daniel@...earbox.net>
> Cc: Andrii Nakryiko <andrii@...nel.org>
> Cc: Martin KaFai Lau <kafai@...com>
> Cc: Song Liu <songliubraving@...com>
> Cc: Yonghong Song <yhs@...com>
> Cc: John Fastabend <john.fastabend@...il.com>
> Cc: KP Singh <kpsingh@...nel.org>
> Cc: netdev@...r.kernel.org
> Cc: bpf@...r.kernel.org
> ---
> Applies to 5.11-rc3 (and hyperv-next).

So this is for hyperv-next or should we take it via netdev trees?

> Changes since v1 (Juan Vazquez):
>   - Improve validation in rndis_set_link_state() and rndis_get_ppi()
>   - Remove memory/skb leak in netvsc_alloc_recv_skb()