Description of problem:
SELinux is preventing /usr/lib/cups/backend/cups-pdf from 'write' accesses on the sock_file system_bus_socket.

*****  Plugin catchall (100. confidence) suggests   **************************

若您相信 cups-pdf 應該預設允許在 system_bus_socket sock_file 上作 write 存取。
Then 您應將此回報為錯誤。
您可產生本機模組，以允許這項存取。
Do
立刻允許此存取，請執行：
# ausearch -c 'cups-pdf' --raw | audit2allow -M my-cupspdf
# semodule -X 300 -i my-cupspdf.pp

Additional Information:
Source Context                system_u:system_r:cups_pdf_t:s0-s0:c0.c1023
Target Context                system_u:object_r:system_dbusd_var_run_t:s0
Target Objects                system_bus_socket [ sock_file ]
Source                        cups-pdf
Source Path                   /usr/lib/cups/backend/cups-pdf
Port                          <未知>
Host                          (removed)
Source RPM Packages           cups-pdf-3.0.1-3.fc27.x86_64
Target RPM Packages           
Policy RPM                    selinux-policy-3.13.1-283.19.fc27.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 4.14.11-300.fc27.x86_64 #1 SMP Wed
                              Jan 3 13:52:28 UTC 2018 x86_64 x86_64
Alert Count                   2
First Seen                    2018-01-08 00:48:23 CST
Last Seen                     2018-01-08 00:48:23 CST
Local ID                      fdb8ff69-1011-4dcb-a96f-11f68f89d172

Raw Audit Messages
type=AVC msg=audit(1515343703.393:321): avc:  denied  { write } for  pid=4975 comm="cups-pdf" name="system_bus_socket" dev="tmpfs" ino=25698 scontext=system_u:system_r:cups_pdf_t:s0-s0:c0.c1023 tcontext=system_u:object_r:system_dbusd_var_run_t:s0 tclass=sock_file permissive=0


type=SYSCALL msg=audit(1515343703.393:321): arch=x86_64 syscall=connect success=no exit=EACCES a0=6 a1=d5b608 a2=21 a3=7ffc72e4bfa0 items=0 ppid=937 pid=4975 auid=4294967295 uid=0 gid=7 euid=0 suid=0 fsuid=0 egid=7 sgid=7 fsgid=7 tty=(none) ses=4294967295 comm=cups-pdf exe=/usr/lib/cups/backend/cups-pdf subj=system_u:system_r:cups_pdf_t:s0-s0:c0.c1023 key=(null)

Hash: cups-pdf,cups_pdf_t,system_dbusd_var_run_t,sock_file,write

Version-Release number of selected component:
selinux-policy-3.13.1-283.19.fc27.noarch

Additional info:
component:      selinux-policy
reporter:       libreport-2.9.3
hashmarkername: setroubleshoot
kernel:         4.14.11-300.fc27.x86_64
type:           libreport