To date the Debian project has held off enabling kernel-level mandatory access controls such as AppArmor. AppArmor, and related technologies like SELinux, are used by several mainstream Linux distributions, including Fedora, Ubuntu and openSUSE. AppArmor prevents hijacks or misbehaving programs from damaging or compromising the operating system by placing restrictions on processes beyond just what file-level permissions are able to accomplish. Following a proposal to enable AppArmor by default, it looks as though Debian's Testing and Unstable branches will use AppArmor for at least a year to allow the developers to test the affect AppArmor has on the distribution. If the trial is successful, AppArmor is expected to be enabled in the next Stable version of Debian.
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