[v17] Restore interactive PAM authentication #49517
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#29279 caused PAM to deadlock when performing interactive authentication. To restore the previous semblance of functional PAM, this reverts waiting for PAM to be complete if BPF is disabled. #29279 was specifically added to prevent systemd, which may be invoked via a PAM module, from moving the exec subprocess to a different cgroup. Since cgroups are not used outside of Enhanced Session Recording this is a stop-gap measure that can allow mose users of PAM to get an immediate restoration of behavior while a more long term and sane approach to performing PAM during the SSH handshake can be considered, evaluated, and tested. Closes #49028.
rosstimothy
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espadolini
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creack
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Backport #49487 to branch/v17