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Date: Wed, 04 May 2022 08:42:46 +0300
From: Kalle Valo <kvalo@...nel.org>
To: Kees Cook <keescook@...omium.org>
Cc: "Gustavo A . R . Silva" <gustavoars@...nel.org>,
Loic Poulain <loic.poulain@...aro.org>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>, wcn36xx@...ts.infradead.org,
linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
Alexei Starovoitov <ast@...nel.org>,
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Andrew Gabbasov <andrew_gabbasov@...tor.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Andy Gross <agross@...nel.org>,
Andy Lavr <andy.lavr@...il.com>,
Arend van Spriel <aspriel@...il.com>,
Baowen Zheng <baowen.zheng@...igine.com>,
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Yang Yingliang <yangyingliang@...wei.com>
Subject: Re: [PATCH 10/32] wcn36xx: Use mem_to_flex_dup() with struct wcn36xx_hal_ind_msg
Kees Cook <keescook@...omium.org> writes:
> As part of the work to perform bounds checking on all memcpy() uses,
> replace the open-coded a deserialization of bytes out of memory into a
> trailing flexible array by using a flex_array.h helper to perform the
> allocation, bounds checking, and copying.
>
> Cc: Loic Poulain <loic.poulain@...aro.org>
> Cc: Kalle Valo <kvalo@...nel.org>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Cc: Jakub Kicinski <kuba@...nel.org>
> Cc: Paolo Abeni <pabeni@...hat.com>
> Cc: wcn36xx@...ts.infradead.org
> Cc: linux-wireless@...r.kernel.org
> Cc: netdev@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>
[...]
> --- a/drivers/net/wireless/ath/wcn36xx/smd.h
> +++ b/drivers/net/wireless/ath/wcn36xx/smd.h
> @@ -46,8 +46,8 @@ struct wcn36xx_fw_msg_status_rsp {
>
> struct wcn36xx_hal_ind_msg {
> struct list_head list;
> - size_t msg_len;
> - u8 msg[];
> + DECLARE_FLEX_ARRAY_ELEMENTS_COUNT(size_t, msg_len);
> + DECLARE_FLEX_ARRAY_ELEMENTS(u8, msg);
This affects readability quite a lot and tbh I don't like it. Isn't
there any simpler way to solve this?
--
https://patchwork.kernel.org/project/linux-wireless/list/
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
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