Yu Watanabe
94fe4cf255
Since kernel v5.2, open_tree() and move_mount() are added. If a service loads or sets credentials, then let's try to clone the mount that contains credentials with open_tree(), then mount it after a (private) mount namespace is initialized for the service. Then, we can setup a mount for credentials directory without leaking it to the main shared mount namespace. With this change, the credentials for services that request their own private mount namespace become much much safer. And, the number of mount events triggered by setting up credential directories can be decreased. Unfortunately, this does not 'fix' the original issue #25527, as the reported service does not requests private mount namespace, but the situation should be better now.
System and Service Manager
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