Subject: [PATCH net-next] audit: Move audit_log_task declaration under CONFIG_AUDITSYSCALL

From: Jiri Olsa <[email-masked]>
Date: Thu, 21 Nov 2019 16:58:53 +0100

The 0-DAY found that audit_log_task is not declared under
CONFIG_AUDITSYSCALL which causes compilation error when
it is not defined:

    kernel/bpf/syscall.o: In function `bpf_audit_prog.isra.30':
 >> syscall.c:(.text+0x860): undefined reference to `audit_log_task'

Adding the audit_log_task declaration and stub within
CONFIG_AUDITSYSCALL ifdef.

Fixes: 91e6015b082b ("bpf: Emit audit messages upon successful prog load and unload")
Reported-by: kbuild test robot <[email-masked]>
Signed-off-by: Jiri Olsa <[email-masked]>
---
 include/linux/audit.h | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/include/linux/audit.h b/include/linux/audit.h
index edd006f4597d..18925d924c73 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -159,7 +159,6 @@ extern void		    audit_log_key(struct audit_buffer *ab,
 extern void		    audit_log_link_denied(const char *operation);
 extern void		    audit_log_lost(const char *message);
 
-extern void audit_log_task(struct audit_buffer *ab);
 extern int audit_log_task_context(struct audit_buffer *ab);
 extern void audit_log_task_info(struct audit_buffer *ab);
 
@@ -220,8 +219,6 @@ static inline void audit_log_key(struct audit_buffer *ab, char *key)
 { }
 static inline void audit_log_link_denied(const char *string)
 { }
-static inline void audit_log_task(struct audit_buffer *ab)
-{ }
 static inline int audit_log_task_context(struct audit_buffer *ab)
 {
 	return 0;
@@ -361,6 +358,8 @@ static inline void audit_ptrace(struct task_struct *t)
 		__audit_ptrace(t);
 }
 
+extern void audit_log_task(struct audit_buffer *ab);
+
 				/* Private API (for audit.c only) */
 extern void __audit_ipc_obj(struct kern_ipc_perm *ipcp);
 extern void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode);
@@ -648,6 +647,9 @@ static inline void audit_ntp_log(const struct audit_ntp_data *ad)
 
 static inline void audit_ptrace(struct task_struct *t)
 { }
+
+static inline void audit_log_task(struct audit_buffer *ab)
+{ }
 #define audit_n_rules 0
 #define audit_signals 0
 #endif /* CONFIG_AUDITSYSCALL */
-- 
2.23.0