1 files changed, 20 insertions, 0 deletions

diff --git a/security/keys/key.c b/security/keys/key.c
index 7ada8019be1f..06783cffb3af 100644
--- a/security/keys/key.c
+++ b/security/keys/key.c
@@ -671,6 +671,26 @@ found_kernel_type:
         return ktype;
 }
 
+void key_set_timeout(struct key *key, unsigned timeout)
+{
+        struct timespec now;
+        time_t expiry = 0;
+
+        /* make the changes with the locks held to prevent races */
+        down_write(&key->sem);
+
+        if (timeout > 0) {
+                now = current_kernel_time();
+                expiry = now.tv_sec + timeout;
+        }
+
+        key->expiry = expiry;
+        key_schedule_gc(key->expiry + key_gc_delay);
+
+        up_write(&key->sem);
+}
+EXPORT_SYMBOL_GPL(key_set_timeout);
+
 /*
  * Unlock a key type locked by key_type_lookup().
  */