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Description of problem:
# sesearch --allow | grep 'svirt_sandbox_domain unconfined_service_t'
allow svirt_sandbox_domain unconfined_service_t:fd use;
allow svirt_sandbox_domain unconfined_service_t:fifo_file { append getattr ioctl lock open read write };
allow svirt_sandbox_domain unconfined_service_t:process sigchld;

Those rules (unsafe) were dropped in RHEL-7.6.2 but still are there in RHEL8.

"We don't want to allow a container to connect to random services on the
host system if they escape confinement." -- Dan Walsh

Version-Release number of selected component (if applicable):
container-selinux-2.75-1.git99e2cfd.module+el8+2769+577ad176.noarch
container-selinux-2.87-3.git891a85f.module+el8+2851+dbc75b3b.noarch

Fixed in container-selinux-2.94

Test with container-selinux-2.107-2.module+el8.1.0+4081+b29780af.noarch, the rules are already dropped. So set this to verified.

Details:
# sesearch --allow | grep 'svirt_sandbox_domain unconfined_service_t'
#

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2019:3403