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hhŒ	_document”hŒsource”NŒline”NubhŒsection”“”)”}”(hhh]”(hŒtitle”“”)”}”(hŒ$User namespaces and resource control”h]”hŒ$User namespaces and resource control”…””}”(hh¨hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hh£hžhhŸŒU/var/lib/git/docbuild/linux/Documentation/admin-guide/namespaces/resource-control.rst”h KubhŒ	paragraph”“”)”}”(hXG  The kernel contains many kinds of objects that either don't have
individual limits or that have limits which are ineffective when
a set of processes is allowed to switch their UID. On a system
where the admins don't trust their users or their users' programs,
user namespaces expose the system to potential misuse of resources.”h]”hXM  The kernel contains many kinds of objects that either donâ€™t have
individual limits or that have limits which are ineffective when
a set of processes is allowed to switch their UID. On a system
where the admins donâ€™t trust their users or their usersâ€™ programs,
user namespaces expose the system to potential misuse of resources.”…””}”(hh¹hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Khh£hžhubh¸)”}”(hX   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.”h]”hX   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.”…””}”(hhÇhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Khh£hžhubh¸)”}”(hŒ¯Memory control groups can be configured by installing the libcgroup
package present on most distros editing /etc/cgrules.conf,
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