lsm_audit: don't specify the audit pre/post callbacks in 'struct common_audit_data'

It just bloats the audit data structure for no good reason, since the
only time those fields are filled are just before calling the
common_lsm_audit() function, which is also the only user of those
fields.

So just make them be the arguments to common_lsm_audit(), rather than
bloating that structure that is passed around everywhere, and is
initialized in hot paths.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 12 insertions, 13 deletions

diff --git a/security/apparmor/audit.c b/security/apparmor/audit.c
index 23f7eb658d9..cc3520d39a7 100644
--- a/security/apparmor/audit.c
+++ b/security/apparmor/audit.c
@@ -160,9 +160,7 @@ void aa_audit_msg(int type, struct common_audit_data *sa,
                   void (*cb) (struct audit_buffer *, void *))
 {
         sa->aad->type = type;
-        sa->lsm_pre_audit = audit_pre;
-        sa->lsm_post_audit = cb;
-        common_lsm_audit(sa);
+        common_lsm_audit(sa, audit_pre, cb);
 }
 
 /**
diff --git a/security/lsm_audit.c b/security/lsm_audit.c
index e96c6aa17bb..90c129b0102 100644
--- a/security/lsm_audit.c
+++ b/security/lsm_audit.c
@@ -378,11 +378,15 @@ static void dump_common_audit_data(struct audit_buffer *ab,
 /**
  * common_lsm_audit - generic LSM auditing function
  * @a:  auxiliary audit data
+ * @pre_audit: lsm-specific pre-audit callback
+ * @post_audit: lsm-specific post-audit callback
  *
  * setup the audit buffer for common security information
  * uses callback to print LSM specific information
  */
-void common_lsm_audit(struct common_audit_data *a)
+void common_lsm_audit(struct common_audit_data *a,
+        void (*pre_audit)(struct audit_buffer *, void *),
+        void (*post_audit)(struct audit_buffer *, void *))
 {
         struct audit_buffer *ab;
 
@@ -394,13 +398,13 @@ void common_lsm_audit(struct common_audit_data *a)
         if (ab == NULL)
                 return;
 
-        if (a->lsm_pre_audit)
-                a->lsm_pre_audit(ab, a);
+        if (pre_audit)
+                pre_audit(ab, a);
 
         dump_common_audit_data(ab, a);
 
-        if (a->lsm_post_audit)
-                a->lsm_post_audit(ab, a);
+        if (post_audit)
+                post_audit(ab, a);
 
         audit_log_end(ab);
 }
diff --git a/security/selinux/avc.c b/security/selinux/avc.c
index 36c42bb52d8..8ee42b2a5f1 100644
--- a/security/selinux/avc.c
+++ b/security/selinux/avc.c
@@ -492,9 +492,7 @@ static noinline int slow_avc_audit(u32 ssid, u32 tsid, u16 tclass,
         slad.denied = denied;
 
         a->selinux_audit_data->slad = &slad;
-        a->lsm_pre_audit = avc_audit_pre_callback;
-        a->lsm_post_audit = avc_audit_post_callback;
-        common_lsm_audit(a);
+        common_lsm_audit(a, avc_audit_pre_callback, avc_audit_post_callback);
         return 0;
 }
 
diff --git a/security/smack/smack_access.c b/security/smack/smack_access.c
index 2af7fcc98a7..c8115f7308f 100644
--- a/security/smack/smack_access.c
+++ b/security/smack/smack_access.c
@@ -321,9 +321,8 @@ void smack_log(char *subject_label, char *object_label, int request,
         sad->object  = object_label;
         sad->request = request_buffer;
         sad->result  = result;
-        a->lsm_pre_audit = smack_log_callback;
 
-        common_lsm_audit(a);
+        common_lsm_audit(a, smack_log_callback, NULL);
 }
 #else /* #ifdef CONFIG_AUDIT */
 void smack_log(char *subject_label, char *object_label, int request,