linux-kernel - Re: [PATCH v3 1/7] wifi: orinoco: Avoid clashing function prototypes

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Message-ID: <166859113003.16887.7125863875259889843.kvalo@kernel.org>
Date:   Wed, 16 Nov 2022 09:32:11 +0000 (UTC)
From:   Kalle Valo <kvalo@...nel.org>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kees Cook <keescook@...omium.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH v3 1/7] wifi: orinoco: Avoid clashing function prototypes

"Gustavo A. R. Silva" <gustavoars@...nel.org> wrote:

> When built with Control Flow Integrity, function prototypes between
> caller and function declaration must match. These mismatches are visible
> at compile time with the new -Wcast-function-type-strict in Clang[1].
> 
> Fix a total of 43 warnings like these:
> 
> drivers/net/wireless/intersil/orinoco/wext.c:1379:27: warning: cast from 'int (*)(struct net_device *, struct iw_request_info *, struct iw_param *, char *)' to 'iw_handler' (aka 'int (*)(struct net_device *, struct iw_request_info *, union iwreq_data *, char *)') converts to incompatible function type [-Wcast-function-type-strict]
>         IW_HANDLER(SIOCGIWPOWER,        (iw_handler)orinoco_ioctl_getpower),
>                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> The orinoco Wireless Extension handler callbacks (iw_handler) use a
> union for the data argument. Actually use the union and perform explicit
> member selection in the function body instead of having a function
> prototype mismatch. No significant binary differences were seen
> before/after changes.
> 
> These changes were made partly manually and partly with the help of
> Coccinelle.
> 
> Link: https://github.com/KSPP/linux/issues/234
> Link: https://reviews.llvm.org/D134831 [1]
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> Reviewed-by: Kees Cook <keescook@...omium.org>

5 patches applied to wireless-next.git, thanks.

2c0e077db65a wifi: orinoco: Avoid clashing function prototypes
02ae6a7034d7 wifi: cfg80211: Avoid clashing function prototypes
fd7ef879a983 wifi: hostap: Avoid clashing function prototypes
ff7efc66b7ea wifi: zd1201: Avoid clashing function prototypes
89e706459848 wifi: airo: Avoid clashing function prototypes

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/e564003608a1f2ad86283370ef816805c92b30f6.1667934775.git.gustavoars@kernel.org/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches