3a78b0e9c4
For a userns root user to be able to access the credentials, both the uid and gid of the credentials directory have to be mapped into the userns. Currently, the credentials directory group is root, which we obviously do not want to map in to a userns, so let's make sure that the credentials directory and files are owned by the service group instead, which can generally be safely mapped into the userns. Since we use permissions mode 0600, this shouldn't cause any change in who is able to access the credentials. Fixes #28747
System and Service Manager
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