/etc/udev/no-legacy-ptys.rules is in selinux-basics 0.5.0.
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 | # Unix98 style /dev/pts should be used with SELinux,
# old-style ptys are not supported. Since they are enabled
# in the Debian kernel, ignore them in udev
KERNEL=="tty[a-z]*", NAME="", OPTIONS+="last_rule"
KERNEL=="pty[a-z]*", NAME="", OPTIONS+="last_rule"
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