linux-kernel - Re: [PATCH][next] netns: Replace zero-length array with DECLARE_FLEX

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Message-ID: <202209261931.6EECD99EE@keescook>
Date:   Mon, 26 Sep 2022 19:31:34 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] netns: Replace zero-length array with
 DECLARE_FLEX_ARRAY() helper

On Mon, Sep 26, 2022 at 06:02:20PM -0500, Gustavo A. R. Silva wrote:
> Zero-length arrays are deprecated and we are moving towards adopting
> C99 flexible-array members, instead. So, replace zero-length arrays
> declarations in anonymous union with the new DECLARE_FLEX_ARRAY()
> helper macro.
> 
> This helper allows for flexible-array members in unions.
> 
> Link: https://github.com/KSPP/linux/issues/193
> Link: https://github.com/KSPP/linux/issues/225
> Link: https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Thanks! Yeah, I tripped over this one myself while testing
-fstrict-flex-arrays.

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook