[DSE-User] security_bounded_transition denied for apt-daily.timer

[Gerald Turner]

I have a host running Debian stretch with SELinux in non-enforcing mode.

I had few services which I had manually hardened with various
systemd.exec(5) directives, and whenever they were restarted, the audit
subsystem would emit a security_bounded_transition denied message, and
'ps' with the -Z flag showed the service was running with init_t context
instead of initrc_t.  My understanding is that there is a bug¹ with
which systemd handles the NoNewPrivileges directive.  I simply removed
the NoNewPrivileges=yes configuration for these services and
security_bounded_transition denials have stopped, the daemons now
running in initrc_t context, and all is good.

Now I've noticed several timers (apt-daily.timer,
apt-daily-upgrade.service, and painintheapt-daily.timer) also cause
similar audit messages every time their services are executed:

  audit: type=1401 audit(1498417202.987:9091): op=security_bounded_transition seresult=denied oldcontext=system_u:system_r:initrc_t:s0 newcontext=system_u:system_r:dpkg_t:s0

AFAICT there is no "NoNewPrivileges=no" work-around like I had done with
my zealously hardened daemons.

What can be done to make these timers execute correctly?


¹ https://github.com/systemd/systemd/issues/3845

PS: thank you Russell Coker for bringing refpolicy back to Debian
stable!

-- 
Gerald Turner <gturner at unzane.com>        Encrypted mail preferred!
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