linux-hardening - Re: [PATCH] uapi: wireless: Replace zero-length array with flexible-array member

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Date:   Wed, 16 Feb 2022 12:36:27 -0800
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Cc: linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
        ; Johannes Berg <johannes.berg@...el.com>
Subject: Re: [PATCH] uapi: wireless: Replace zero-length array with
 flexible-array member

On Wed, Feb 16, 2022 at 01:53:06PM -0600, Gustavo A. R. Silva wrote:
> There is a regular need in the kernel to provide a way to declare
> having a dynamically sized set of trailing elements in a structure.
> Kernel code should always use “flexible array members”[1] for these
> cases. The older style of one-element or zero-length arrays should
> no longer be used[2].
> 
> [1] https://en.wikipedia.org/wiki/Flexible_array_member
> [2] https://www.kernel.org/doc/html/v5.16/process/deprecated.html#zero-length-and-one-element-arrays
> 
> Link: https://github.com/KSPP/linux/issues/78
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>

This UAPI change should be fine for any compiler that understood the
older "[0]" syntax.

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

-- 
Kees Cook