linux-kernel - Re: [PATCH] module: fix clang CFI with MODULE

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Date:   Mon, 27 Sep 2021 15:34:22 +0200 (CEST)
From:   Miroslav Benes <mbenes@...e.cz>
To:     Arnd Bergmann <arnd@...nel.org>
cc:     Luis Chamberlain <mcgrof@...nel.org>, Jessica Yu <jeyu@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kees Cook <keescook@...omium.org>,
        Sergey Shtylyov <s.shtylyov@...russia.ru>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Stephen Boyd <swboyd@...omium.org>,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] module: fix clang CFI with MODULE_UNLOAD=n

On Mon, 27 Sep 2021, Arnd Bergmann wrote:

> From: Arnd Bergmann <arnd@...db.de>
> 
> When CONFIG_MODULE_UNLOAD is disabled, the module->exit member
> is not defined, causing a build failure:
> 
> kernel/module.c:4493:8: error: no member named 'exit' in 'struct module'
>                 mod->exit = *exit;
> 
> add an #ifdef block around this.
> 
> Fixes: cf68fffb66d6 ("add support for Clang CFI")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Miroslav Benes <mbenes@...e.cz>

M