linux-hardening - Re: [PATCH] carl9170: Replace zero-length array of trailing structs with flex-array

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Date:   Fri, 18 Nov 2022 23:08:36 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Kalle Valo <kvalo@...nel.org>
Cc:     Christian Lamparter <chunkeey@...glemail.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] carl9170: Replace zero-length array of trailing structs
 with flex-array

On Sat, Nov 19, 2022 at 08:39:11AM +0200, Kalle Valo wrote:
> Kees Cook <keescook@...omium.org> writes:
> 
> > Zero-length arrays are deprecated[1] and are being replaced with
> > flexible array members in support of the ongoing efforts to tighten the
> > FORTIFY_SOURCE routines on memcpy(), correctly instrument array indexing
> > with UBSAN_BOUNDS, and to globally enable -fstrict-flex-arrays=3.
> >
> > Replace zero-length array with flexible-array member.
> >
> > This results in no differences in binary output.
> >
> > [1] https://github.com/KSPP/linux/issues/78
> >
> > Cc: Christian Lamparter <chunkeey@...glemail.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: "Gustavo A. R. Silva" <gustavoars@...nel.org>
> > Cc: linux-wireless@...r.kernel.org
> > Cc: netdev@...r.kernel.org
> > Signed-off-by: Kees Cook <keescook@...omium.org>
> 
> Nowadays we include "wifi:" in the subject, but I can add that. But
> please use this in the future for all wireless patches.

Okay, thanks! I use a recency/frequency prefix guesser, but I've updated
it to include "wifi: " if "linux-wireless@...r.kernel.org" is in CC. :)

-- 
Kees Cook