linux-hardening - Re: [PATCH][next] io_uring: replace zero-length array with flexible-array member

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Message-ID: <37147b0c-4b11-37df-6c4a-ee2dfeb9cbb7@kernel.dk>
Date:   Tue, 28 Jun 2022 13:38:44 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Pavel Begunkov <asml.silence@...il.com>
Cc:     io-uring@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] io_uring: replace zero-length array with
 flexible-array member

On 6/28/22 1:33 PM, 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

Thanks for sending this separately. As mentioned out-of-band, we already
have it like this in the io_uring.h header in liburing.

Applied for 5.20.

-- 
Jens Axboe