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module: fix clang CFI with MODULE_UNLOAD=n

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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: cf68fffb66 ("add support for Clang CFI")
Acked-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jessica Yu <jeyu@kernel.org>
This commit is contained in:
Arnd Bergmann 2021-09-27 14:15:10 +02:00 committed by Jessica Yu
parent 5816b3e657
commit 0d67e332e6
1 changed files with 2 additions and 0 deletions
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2
kernel/module.c
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@ -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