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

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Message-Id: <20210927121541.939745-1-arnd@kernel.org>
Date:   Mon, 27 Sep 2021 14:15:10 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Luis Chamberlain <mcgrof@...nel.org>, Jessica Yu <jeyu@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Miroslav Benes <mbenes@...e.cz>,
        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: [PATCH] module: fix clang CFI with MODULE_UNLOAD=n

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>
---
 kernel/module.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/module.c b/kernel/module.c
index 40ec9a030eec..5c26a76e800b 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -4489,8 +4489,10 @@ static void cfi_init(struct module *mod)
 	/* Fix init/exit functions to point to the CFI jump table */
 	if (init)
 		mod->init = *init;
+#ifdef CONFIG_MODULE_UNLOAD
 	if (exit)
 		mod->exit = *exit;
+#endif
 
 	cfi_module_add(mod, module_addr_min);
 #endif
-- 
2.29.2