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docs: namespace: Tweak and reword resource control doc 

Fix the document title and reword the phrasing to active voice.

Signed-off-by: Joel Savitz <jsavitz@redhat.com>
Message-ID: <20250421161723.1138903-1-jsavitz@redhat.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Joel Savitz 2025-04-21 12:17:23 -04:00 committed by Jonathan Corbet
parent 6c2f0b28d7
commit c0fe189b59
1 changed files with 12 additions and 12 deletions
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24
Documentation/admin-guide/namespaces/resource-control.rst
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@ -1,17 +1,17 @@
===========================
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,