[AUDIT] return EINTR not ERESTART*

The syscall exit code will change ERESTART* kernel internal return codes
to EINTR if it does not restart the syscall.  Since we collect the audit
info before that point we should fix those in the audit log as well.

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

kernel/auditsc.c

@@ -701,7 +701,24 @@ static inline struct audit_context *audit_get_context(struct task_struct *tsk,
 	if (likely(!context))
 		return NULL;
 	context->return_valid = return_valid;
-	context->return_code  = return_code;
+
+	/*
+	 * we need to fix up the return code in the audit logs if the actual
+	 * return codes are later going to be fixed up by the arch specific
+	 * signal handlers
+	 *
+	 * This is actually a test for:
+	 * (rc == ERESTARTSYS ) || (rc == ERESTARTNOINTR) ||
+	 * (rc == ERESTARTNOHAND) || (rc == ERESTART_RESTARTBLOCK)
+	 *
+	 * but is faster than a bunch of ||
+	 */
+	if (unlikely(return_code <= -ERESTARTSYS) &&
+	    (return_code >= -ERESTART_RESTARTBLOCK) &&
+	    (return_code != -ENOIOCTLCMD))
+		context->return_code = -EINTR;
+	else
+		context->return_code  = return_code;
 
 	if (context->in_syscall && !context->dummy && !context->auditable) {
 		enum audit_state state;