On 07/05/2015 06:35 PM, Sam Varshavchik wrote:
>
> Also, look at the pid and the lock files, and do an fuser to see who has
> the pid and the lock files open.
>
> -stop tries to lock the lock file, if it can't, it reads the pid from
> the pid file, sends a SIGTERM. If it's still can't lock the lock file
> after ten seconds have elapsed, it sends a SIGKILL; but it still tries
> to lock the lock file.
Surprise, it's an SELinux failure.
# lsof /var/spool/authdaemon/*
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
courierlo 694 root 1023uW REG 253,2 0 5242943
/var/spool/authdaemon/pid.lock
courierlo 14264 root 3u REG 253,2 0 5242943
/var/spool/authdaemon/pid.lock
# cat /var/spool/authdaemon/pid
694
# ps axf | grep authd
694 ? S 0:00 /usr/sbin/courierlogger
-pid=/var/spool/authdaemon/pid -start
/usr/libexec/courier-authlib/authdaemond
...all that looks fine.
type=AVC msg=audit(1436121128.545:4130): avc: denied { signal } for
pid=14263 comm="courierlogger"
scontext=unconfined_u:unconfined_r:system_mail_t:s0-s0:c0.c1023
tcontext=system_u:system_r:unconfined_service_t:s0 tclass=process
type=AVC msg=audit(1436121138.546:4161): avc: denied { sigkill } for
pid=14263 comm="courierlogger"
scontext=unconfined_u:unconfined_r:system_mail_t:s0-s0:c0.c1023
tcontext=system_u:system_r:unconfined_service_t:s0 tclass=process
...
The latter message repeats.
courierlogger is set to courier_exec_t:
/etc/selinux/targeted/contexts/files/file_contexts:/usr/sbin/courierlogger
-- system_u:object_r:courier_exec_t:s0
# ls -lZ /usr/sbin/courierlogger
-rwxr-xr-x. daemon daemon system_u:object_r:courier_exec_t:s0
/usr/sbin/courierlogger
I think something treats courier_exec_t as an alias of system_mail_t,
but I don't remember where that might be defined. I'm kind of getting
tired of filing bugs with Red Hat because they treat Courier as if it
were sendmail.
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