netdev - Re: [PATCH v2] iwlwifi: Track scan_cmd allocation size explicitly

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Date:   Mon, 26 Sep 2022 10:59:52 +0300
From:   Kalle Valo <kvalo@...nel.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Gregory Greenman <gregory.greenman@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Luca Coelho <luciano.coelho@...el.com>,
        Johannes Berg <johannes.berg@...el.com>,
        Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
        Miri Korenblit <miriam.rachel.korenblit@...el.com>,
        Ilan Peer <ilan.peer@...el.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        Nathan Errera <nathan.errera@...el.com>,
        Mordechay Goodstein <mordechay.goodstein@...el.com>,
        Mike Golant <michael.golant@...el.com>,
        Ayala Beker <ayala.beker@...el.com>,
        Avraham Stern <avraham.stern@...el.com>,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2] iwlwifi: Track scan_cmd allocation size explicitly

Kees Cook <keescook@...omium.org> writes:

> In preparation for reducing the use of ksize(), explicitly track the
> size of scan_cmd allocations. This also allows for noticing if the scan
> size changes unexpectedly. Note that using ksize() was already incorrect
> here, in the sense that ksize() would not match the actual allocation
> size, which would trigger future run-time allocation bounds checking.
> (In other words, memset() may know how large scan_cmd was allocated for,
> but ksize() will return the upper bounds of the actually allocated memory,
> causing a run-time warning about an overflow.)
>
> 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: Luca Coelho <luciano.coelho@...el.com>
> Cc: Johannes Berg <johannes.berg@...el.com>
> Cc: Emmanuel Grumbach <emmanuel.grumbach@...el.com>
> Cc: Miri Korenblit <miriam.rachel.korenblit@...el.com>
> Cc: Ilan Peer <ilan.peer@...el.com>
> Cc: linux-wireless@...r.kernel.org
> Cc: netdev@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

Gregory, can I take this directly to wireless-next?

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