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In the help text describing user namespaces recommend use of memory control groups. In many cases memory control groups are the only mechanism there is to limit how much memory a user who can create user namespaces can use. Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
15 lines
764 B
Plaintext
15 lines
764 B
Plaintext
There are a lot of kinds of objects in the kernel that don't have
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individual limits or that have limits that are ineffective when a set
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of processes is allowed to switch user ids. With user namespaces
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enabled in a kernel for people who don't trust their users or their
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users programs to play nice this problems becomes more acute.
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Therefore it is recommended that memory control groups be enabled in
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kernels that enable user namespaces, and it is further recommended
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that userspace configure memory control groups to limit how much
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memory user's they don't trust to play nice can use.
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Memory control groups can be configured by installing the libcgroup
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package present on most distros editing /etc/cgrules.conf,
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/etc/cgconfig.conf and setting up libpam-cgroup.
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