[systemd-bugs] [Bug 62866] Users logging in gets previous user's XDG_RUNTIME_DIR

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=62866

--- Comment #5 from Lennart Poettering <lennart at poettering.net> ---
The various PAM modules alter a number of process attributes (such as cgroup
membership in the case of pam_systemd, or resource limits for pam_limits, and
so on). If you recycle the PID you will inherit those. You need to start with a
fresh set of attributes by forking off a clean process from some well-defined
parent process, before you restart PAM.

pam_systemd for example will move the calling process into a cgroup of its own
and that's really a one-way operation.

Really, you cannot have the same process create multiple PAM sessions one after
the other. The various PAM modules in use do not allow that, pam_systemd is
just one of them.

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