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etc_org/sysctl.d/10-kernel-hardening.conf

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+# These settings are specific to hardening the kernel itself from attack
+# from userspace, rather than protecting userspace from other malicious
+# userspace things.
+#
+#
+# When an attacker is trying to exploit the local kernel, it is often
+# helpful to be able to examine where in memory the kernel, modules,
+# and data structures live. As such, kernel addresses should be treated
+# as sensitive information.
+#
+# Many files and interfaces contain these addresses (e.g. /proc/kallsyms,
+# /proc/modules, etc), and this setting can censor the addresses. A value
+# of "0" allows all users to see the kernel addresses. A value of "1"
+# limits visibility to the root user, and "2" blocks even the root user.
+kernel.kptr_restrict = 1