/usr/share/seccomp/policygroups/ubuntu-core/16.04/mir-client is in ubuntu-core-security-seccomp 16.04.15.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | # Description: Can access the Mir display server as a client
# Usage: common
# needed to connect to mir
socketpair
# TODO: is this needed by the client too? If it is, then we need to change the
# Usage to 'reserved' until we have seccomp arg filtering implemented.
#lchown
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