linux-kernel - [PATCH] LSM: Fix type of id parameter in kernel_post_load

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Date:   Tue,  6 Oct 2020 13:11:15 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kees Cook <keescook@...omium.org>
Cc:     James Morris <jmorris@...ei.org>, KP Singh <kpsingh@...gle.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com,
        Nathan Chancellor <natechancellor@...il.com>
Subject: [PATCH] LSM: Fix type of id parameter in kernel_post_load_data prototype

Clang warns:

security/security.c:1716:59: warning: implicit conversion from
enumeration type 'enum kernel_load_data_id' to different enumeration
type 'enum kernel_read_file_id' [-Wenum-conversion]
        ret = call_int_hook(kernel_post_load_data, 0, buf, size, id,
              ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
security/security.c:715:22: note: expanded from macro 'call_int_hook'
                        RC = P->hook.FUNC(__VA_ARGS__);         \
                             ~            ^~~~~~~~~~~
1 warning generated.

There is a mismatch between the id parameter type in
security_kernel_post_load_data and the function pointer prototype that
is created by the LSM_HOOK macro in the security_list_options union. Fix
the type in the LSM_HOOK macro as 'enum kernel_load_data_id' is what is
expected.

Fixes: b64fcae74b6d ("LSM: Introduce kernel_post_load_data() hook")
Link: https://github.com/ClangBuiltLinux/linux/issues/1172
Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
---
 include/linux/lsm_hook_defs.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h
index d67cb3502310..32a940117e7a 100644
--- a/include/linux/lsm_hook_defs.h
+++ b/include/linux/lsm_hook_defs.h
@@ -186,7 +186,7 @@ LSM_HOOK(int, 0, kernel_create_files_as, struct cred *new, struct inode *inode)
 LSM_HOOK(int, 0, kernel_module_request, char *kmod_name)
 LSM_HOOK(int, 0, kernel_load_data, enum kernel_load_data_id id, bool contents)
 LSM_HOOK(int, 0, kernel_post_load_data, char *buf, loff_t size,
-	 enum kernel_read_file_id id, char *description)
+	 enum kernel_load_data_id id, char *description)
 LSM_HOOK(int, 0, kernel_read_file, struct file *file,
 	 enum kernel_read_file_id id, bool contents)
 LSM_HOOK(int, 0, kernel_post_read_file, struct file *file, char *buf,

base-commit: dba8648dcab90564b8a11c952c06a9e1153506fb
-- 
2.29.0.rc0