Lennart Poettering
b7ab919eba
pidfd_get_inode_id_self_cached() keys its cache on the PID only. This is not sufficient to detect that we are in a different process: if we are PID 1 of a PID namespace and fork off a child into a new PID namespace, the child will be PID 1 too, and would then continue to use the parent's cached pidfd ID. For example, a nested nspawn running as PID 1 would fill the cache in sd_listen_fds() (which checks $LISTEN_PIDFDID), and then pass its own ID to the payload, which would in turn drop the fds passed to it. Fix this by explicitly flushing the cache from reset_cached_pid(), i.e. the pthread_atfork() child handler and from raw_clone(), the same way we already flush the cached PID. Also add a test that covers the PID 1 → PID 1 case.
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