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Ubuntu 20.10 Moving Ahead In Restricting Access To dmesg
In recent times more Linux distributions have been restricting access to dmesg over the possibility of kernel addresses being leaked or other potentially sensitive bits while as it stands now on Ubuntu there is free reign on multi-user systems to have unprivileged users read dmesg output.
Canonical's Seth Forshee commented their security team is in agreement with this work and they have made the change for their Linux 5.7/5.8 kernel trees. The Linux 5.7~5.8 kernel update will hit the Ubuntu 20.10 development repository in the next few weeks. CONFIG_SECURITY_DMESG_RESTRICT is being set to enable this restriction.