[AUDIT] Add End of Event record

This patch adds an end of event record type. It will be sent by the kernel as
the last record when a multi-record event is triggered. This will aid realtime
analysis programs since they will now reliably know they have the last record
to complete an event. The audit daemon filters this and will not write it to
disk.

Signed-off-by: Steve Grubb <sgrubb redhat com>
Signed-off-by: Eric Paris <eparis@redhat.com>

2 files changed, 6 insertions, 0 deletions

diff --git a/include/linux/audit.h b/include/linux/audit.h
index 52f1b12505a9..4d1c2f2fcc1b 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -98,6 +98,7 @@
 #define AUDIT_FD_PAIR           1317    /* audit record for pipe/socketpair */
 #define AUDIT_OBJ_PID           1318    /* ptrace target */
 #define AUDIT_TTY               1319    /* Input on an administrative TTY */
+#define AUDIT_EOE               1320    /* End of multi-record event */
 
 #define AUDIT_AVC               1400    /* SE Linux avc denial or grant */
 #define AUDIT_SELINUX_ERR       1401    /* Internal SE Linux Errors */
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 4e67abb02904..6e5de767bad1 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -1270,6 +1270,11 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
 
                 audit_log_end(ab);
         }
+
+        /* Send end of event record to help user space know we are finished */
+        ab = audit_log_start(context, GFP_KERNEL, AUDIT_EOE);
+        if (ab)
+                audit_log_end(ab);
         if (call_panic)
                 audit_panic("error converting sid to string");
 }