Hello. During my testing of systemd pam sessions i discovered that pam session is not closed automatically when i specify KillUserProcesses=yes in latest versions. Investigations showed that since in pam module we started to dup fifo descriptor problem appeared. Dup does not set O_CLOEXEC flag. So after fork/exec all children processes have that descriptor and when parent which open pam session dies, children processes continue to run.
Sergei.
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