linux-kernel - Re: [PATCH] wifi: iwlwifi: dvm: Add struct_group for struct iwl

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Message-ID: <Y/Im/G6/Ij26oRhF@corigine.com>
Date:   Sun, 19 Feb 2023 14:41:16 +0100
From:   Simon Horman <simon.horman@...igine.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Gregory Greenman <gregory.greenman@...el.com>,
        Kalle Valo <kvalo@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Johannes Berg <johannes.berg@...el.com>,
        Benjamin Berg <benjamin.berg@...el.com>,
        Sriram R <quic_srirrama@...cinc.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] wifi: iwlwifi: dvm: Add struct_group for struct
 iwl_keyinfo keys

On Sat, Feb 18, 2023 at 11:11:00AM -0800, Kees Cook wrote:
> Function iwlagn_send_sta_key() was trying to write across multiple
> structure members in a single memcpy(). Add a struct group "keys" to
> let the compiler see the intended bounds of the memcpy, which includes
> the tkip keys as well. Silences false positive memcpy() run-time
> warning:
> 
>   memcpy: detected field-spanning write (size 32) of single field "sta_cmd.key.key" at drivers/net/wireless/intel/iwlwifi/dvm/sta.c:1103 (size 16)
> 
> Link: https://www.alionet.org/index.php?topic=1469.0
> Cc: Gregory Greenman <gregory.greenman@...el.com>
> Cc: Kalle Valo <kvalo@...nel.org>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Cc: Jakub Kicinski <kuba@...nel.org>
> Cc: Paolo Abeni <pabeni@...hat.com>
> Cc: Johannes Berg <johannes.berg@...el.com>
> Cc: Benjamin Berg <benjamin.berg@...el.com>
> Cc: Sriram R <quic_srirrama@...cinc.com>
> Cc: linux-wireless@...r.kernel.org
> Cc: netdev@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

Reviewed-by: Simon Horman <simon.horman@...igine.com>