linux-hardening - Re: [PATCH][next] media: venus: hfi_cmds: Replace fake flex-arrays with flexible-array members

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Date:   Wed, 17 May 2023 11:54:27 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     Stanimir Varbanov <stanimir.k.varbanov@...il.com>,
        Vikash Garodia <quic_vgarodia@...cinc.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH][next] media: venus: hfi_cmds: Replace fake flex-arrays
 with flexible-array members

On Tue, May 16, 2023 at 07:18:01PM -0600, Gustavo A. R. Silva wrote:
> One-element arrays are deprecated, and we are replacing them with flexible
> array members instead. So, replace one-element arrays with flexible-array
> members in multiple structures.
> 
> This helps with the ongoing efforts to tighten the FORTIFY_SOURCE
> routines on memcpy() and help us make progress towards globally
> enabling -fstrict-flex-arrays=3 [1].
> 
> This results in no differences in binary output.
> 
> Link: https://github.com/KSPP/linux/issues/79
> Link: https://github.com/KSPP/linux/issues/294
> Link: https://gcc.gnu.org/pipermail/gcc-patches/2022-October/602902.html [1]
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>

The subject is very close to the related patch (plural vs non-plural):
https://lore.kernel.org/all/e4b13d7b79d1477e775c6d4564f7b23c4cf967f2.1684278538.git.gustavoars@kernel.org/

So it might be nice to name struct hfi_session_set_buffers_pkt
specifically in the other patch's subject, but otherwise:

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

-- 
Kees Cook