security: create task_free security callback

The current LSM interface to cred_free is not sufficient for allowing
an LSM to track the life and death of a task. This patch adds the
task_free hook so that an LSM can clean up resources on task death.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/kernel/fork.c b/kernel/fork.c
index 1b2ef3c23ae4..f0e7781ba9b4 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -192,6 +192,7 @@ void __put_task_struct(struct task_struct *tsk)
         WARN_ON(atomic_read(&tsk->usage));
         WARN_ON(tsk == current);
 
+        security_task_free(tsk);
         exit_creds(tsk);
         delayacct_tsk_free(tsk);
         put_signal_struct(tsk->signal);