netdev - Re: [PATCH net] cfg80211: fix callback type mismatches in wext-compat

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Message-ID: <202011201118.8F1A488@keescook>
Date:   Fri, 20 Nov 2020 11:18:17 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Sami Tolvanen <samitolvanen@...gle.com>
Cc:     Johannes Berg <johannes@...solutions.net>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Sedat Dilek <sedat.dilek@...il.com>
Subject: Re: [PATCH net] cfg80211: fix callback type mismatches in wext-compat

On Tue, Nov 17, 2020 at 12:59:02PM -0800, Sami Tolvanen wrote:
> Instead of casting callback functions to type iw_handler, which trips
> indirect call checking with Clang's Control-Flow Integrity (CFI), add
> stub functions with the correct function type for the callbacks.
> 
> Reported-by: Sedat Dilek <sedat.dilek@...il.com>
> Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>

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

-- 
Kees Cook