linux-kernel - Re: [PATCH net-next 0/3] virtchnl: fix fake 1-elem arrays

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Message-ID: <88dce445-180c-72d9-c7a5-f0a18a18c747@intel.com>
Date:   Fri, 4 Aug 2023 18:38:09 +0200
From:   Alexander Lobakin <aleksander.lobakin@...el.com>
To:     Tony Nguyen <anthony.l.nguyen@...el.com>
CC:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Larysa Zaremba <larysa.zaremba@...el.com>,
        "Andy Shevchenko" <andriy.shevchenko@...ux.intel.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Kees Cook <keescook@...omium.org>, <netdev@...r.kernel.org>,
        <linux-hardening@...r.kernel.org>,
        <intel-wired-lan@...ts.osuosl.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next 0/3] virtchnl: fix fake 1-elem arrays

From: Alexander Lobakin <aleksander.lobakin@...el.com>
Date: Fri, 28 Jul 2023 17:52:04 +0200

> 6.5-rc1 started spitting warning splats when composing virtchnl
> messages, precisely on virtchnl_rss_key and virtchnl_lut:
> 
> [   84.167709] memcpy: detected field-spanning write (size 52) of single
> field "vrk->key" at drivers/net/ethernet/intel/iavf/iavf_virtchnl.c:1095
> (size 1)
> [   84.169915] WARNING: CPU: 3 PID: 11 at drivers/net/ethernet/intel/
> iavf/iavf_virtchnl.c:1095 iavf_set_rss_key+0x123/0x140 [iavf]

[...]

>  .../ethernet/intel/i40e/i40e_virtchnl_pf.c    |   9 +-
>  drivers/net/ethernet/intel/iavf/iavf.h        |   6 +-
>  drivers/net/ethernet/intel/iavf/iavf_client.c |   4 +-
>  drivers/net/ethernet/intel/iavf/iavf_client.h |   2 +-
>  .../net/ethernet/intel/iavf/iavf_virtchnl.c   |  75 +++++------
>  drivers/net/ethernet/intel/ice/ice_virtchnl.c |   2 +-
>  include/linux/avf/virtchnl.h                  | 127 +++++++++++-------
>  7 files changed, 124 insertions(+), 101 deletions(-)
> 

Tony, could you please take it via your next tree? I'd like the
validation to make sure more different host <-> guest pairs work.

(with Kees' tags, assuming he reviewed and approved the whole series, I
 asked about #2 already)

Thanks,
Olek