Description of problem:

When trying to create a fifo file in an unpriviledged container it is blocked by selinux:

$ rpm -qi container-selinux
Name        : container-selinux
Epoch       : 2
Version     : 2.85
Release     : 1.git92af7fd.fc29
Architecture: noarch
Install Date: Fr 15 Mär 2019 14:42:45 CET
Group       : Unspecified
Size        : 38790
License     : GPLv2
Signature   : RSA/SHA256, Fr 01 Mär 2019 12:01:48 CET, Key ID a20aa56b429476b4
Source RPM  : container-selinux-2.85-1.git92af7fd.fc29.src.rpm
Build Date  : Do 28 Feb 2019 20:54:39 CET
Build Host  : buildhw-04.phx2.fedoraproject.org
Relocations : (not relocatable)
Packager    : Fedora Project
Vendor      : Fedora Project
URL         : https://github.com/projectatomic/container-selinux
Bug URL     : https://bugz.fedoraproject.org/container-selinux
Summary     : SELinux policies for container runtimes
Description :
SELinux policy modules for use with container runtimes.

$ rpm -qi podman
Name        : podman
Epoch       : 1
Version     : 1.1.2
Release     : 1.git0ad9b6b.fc29
Architecture: x86_64
Install Date: Fr 15 Mär 2019 14:43:13 CET
Group       : Unspecified
Size        : 38176514
License     : ASL 2.0
Signature   : RSA/SHA256, Di 05 Mär 2019 20:11:27 CET, Key ID a20aa56b429476b4
Source RPM  : podman-1.1.2-1.git0ad9b6b.fc29.src.rpm
Build Date  : Di 05 Mär 2019 19:11:30 CET
Build Host  : buildhw-08.phx2.fedoraproject.org
Relocations : (not relocatable)
Packager    : Fedora Project
Vendor      : Fedora Project
URL         : https://podman.io/
Bug URL     : https://bugz.fedoraproject.org/podman
Summary     : Manage Pods, Containers and Container Images
Description :
Manage Pods, Containers and Container Images
libpod provides a library for applications looking to use
the Container Pod concept popularized by Kubernetes.

$ id
uid=1000(mh) gid=1000(mh) groups=1000(mh),10(wheel) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023

$ podman run -it fedora:29 /bin/bash
Trying to pull docker.io/library/fedora:29...Getting image source signatures
Copying blob 01eb078129a0 [======================================] 85.8MiB / 85.8MiB
Copying config d09302f77c [======================================] 2.0KiB / 2.0KiB
Writing manifest to image destination
Storing signatures
[root@62059d4ee3c0 /]# mkfifo /tmp/a
mkfifo: cannot create fifo '/tmp/a': Permission denied

SELinux is preventing mkfifo from 'create' accesses on the fifo_file a.

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

If you believe that mkfifo should be allowed create access on the a fifo_file by default.
Then you should report this as a bug.
You can generate a local policy module to allow this access.
Do
allow this access for now by executing:
# ausearch -c 'mkfifo' --raw | audit2allow -M my-mkfifo
# semodule -X 300 -i my-mkfifo.pp

Additional Information:
Source Context                system_u:system_r:container_t:s0:c189,c377
Target Context                system_u:object_r:fusefs_t:s0
Target Objects                a [ fifo_file ]
Source                        mkfifo
Source Path                   mkfifo
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           
Policy RPM                    selinux-policy-3.14.2-51.fc29.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 4.20.16-200.fc29.x86_64 #1 SMP Thu
                              Mar 14 15:10:22 UTC 2019 x86_64 x86_64
Alert Count                   1
First Seen                    2019-03-27 23:20:46 CET
Last Seen                     2019-03-27 23:20:46 CET
Local ID                      1b0c4248-5169-472f-85e4-33fcdc17612d

Raw Audit Messages
type=AVC msg=audit(1553725246.502:2928): avc:  denied  { create } for  pid=9755 comm="mkfifo" name="a" scontext=system_u:system_r:container_t:s0:c189,c377 tcontext=system_u:object_r:fusefs_t:s0 tclass=fifo_file permissive=0


Hash: mkfifo,container_t,fusefs_t,fifo_file,create