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-rw-r--r--security/keys/key.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/security/keys/key.c b/security/keys/key.c
index 7ada8019be1..06783cffb3a 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().
*/