Description of problem:
SELinux is preventing sh from 'write' accesses on the каталог /tmp.

*****  Plugin restorecon (99.5 confidence) suggests   ************************

If you want to fix the label. 
/tmp default label should be tmp_t.
Then you can run restorecon. The access attempt may have been stopped due to insufficient permissions to access a parent directory in which case try to change the following command accordingly.
Do
# /sbin/restorecon -v /tmp

*****  Plugin catchall (1.49 confidence) suggests   **************************

If you believe that sh should be allowed write access on the tmp directory by default.
Then рекомендуется создать отчет об ошибке.
Чтобы разрешить доступ, можно создать локальный модуль политики.
Do
allow this access for now by executing:
# ausearch -c 'sh' --raw | audit2allow -M my-sh
# semodule -X 300 -i my-sh.pp

Additional Information:
Source Context                system_u:system_r:abrt_t:s0-s0:c0.c1023
Target Context                system_u:object_r:tmpfs_t:s0
Target Objects                /tmp [ dir ]
Source                        sh
Source Path                   sh
Port                          <Неизвестно>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           filesystem-3.3-3.fc27.x86_64
Policy RPM                    selinux-policy-3.13.1-283.26.fc27.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 4.15.8-300.fc27.x86_64 #1 SMP Fri
                              Mar 9 18:11:36 UTC 2018 x86_64 x86_64
Alert Count                   4
First Seen                    2018-03-14 09:08:41 MSK
Last Seen                     2018-03-14 09:08:44 MSK
Local ID                      0b1fe8db-c005-433b-913b-5338cc2f4ac2

Raw Audit Messages
type=AVC msg=audit(1521007724.666:235): avc:  denied  { write } for  pid=1699 comm="sh" name="/" dev="tmpfs" ino=25822 scontext=system_u:system_r:abrt_t:s0-s0:c0.c1023 tcontext=system_u:object_r:tmpfs_t:s0 tclass=dir permissive=0


Hash: sh,abrt_t,tmpfs_t,dir,write

Version-Release number of selected component:
selinux-policy-3.13.1-283.26.fc27.noarch

Additional info:
component:      selinux-policy
reporter:       libreport-2.9.3
hashmarkername: setroubleshoot
kernel:         4.15.8-300.fc27.x86_64
type:           libreport