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-===========================
-Namespaces research control
-===========================
+====================================
+User namespaces and resource control
+====================================
-There are a lot of kinds of objects in the kernel that don't have
-individual limits or that have limits that are ineffective when a set
-of processes is allowed to switch user ids. With user namespaces
-enabled in a kernel for people who don't trust their users or their
-users programs to play nice this problems becomes more acute.
+The kernel contains many kinds of objects that either don't have
+individual limits or that have limits which are ineffective when
+a set of processes is allowed to switch their UID. On a system
+where the admins don't trust their users or their users' programs,
+user namespaces expose the system to potential misuse of resources.
-Therefore it is recommended that memory control groups be enabled in
-kernels that enable user namespaces, and it is further recommended
-that userspace configure memory control groups to limit how much
-memory user's they don't trust to play nice can use.
+In order to mitigate this, we recommend that admins enable memory
+control groups on any system that enables user namespaces.
+Furthermore, we recommend that admins configure the memory control
+groups to limit the maximum memory usable by any untrusted user.
Memory control groups can be configured by installing the libcgroup
package present on most distros editing /etc/cgrules.conf,