linux-hardening - Re: [PATCH][next] ASoC: uapi: Replace zero-length arrays with __DECLARE_FLEX

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Message-ID: <202209261932.F68BBD85@keescook>
Date:   Mon, 26 Sep 2022 19:33:09 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] ASoC: uapi: Replace zero-length arrays with
 __DECLARE_FLEX_ARRAY() helper

On Mon, Sep 26, 2022 at 06:18:42PM -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/227
> Link: https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Some day after the __element_count__ attribute exists, we might want to
consider a __type_select__ attribute to tie union members to a variable
outside the union (like the "type" member here).

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

-- 
Kees Cook