TOMOYO: Add missing poll() hook.

Commit 1dae08c "TOMOYO: Add interactive enforcing mode." forgot to register
poll() hook. As a result, /usr/sbin/tomoyo-queryd was doing busy loop.

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/security/tomoyo/common.c b/security/tomoyo/common.c
index 65c18af3ffe5..bff63929e53d 100644
--- a/security/tomoyo/common.c
+++ b/security/tomoyo/common.c
@@ -1898,6 +1898,23 @@ int tomoyo_open_control(const u8 type, struct file *file)
 }
 
 /**
+ * tomoyo_poll_control - poll() for /sys/kernel/security/tomoyo/ interface.
+ *
+ * @file: Pointer to "struct file".
+ * @wait: Pointer to "poll_table".
+ *
+ * Waits for read readiness.
+ * /sys/kernel/security/tomoyo/query is handled by /usr/sbin/tomoyo-queryd .
+ */
+int tomoyo_poll_control(struct file *file, poll_table *wait)
+{
+        struct tomoyo_io_buffer *head = file->private_data;
+        if (!head->poll)
+                return -ENOSYS;
+        return head->poll(file, wait);
+}
+
+/**
  * tomoyo_read_control - read() for /sys/kernel/security/tomoyo/ interface.
  *
  * @file:       Pointer to "struct file".