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userns: Recommend use of memory control groups.

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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 <[email protected]>
Signed-off-by: Eric W. Biederman <[email protected]>
This commit is contained in:
Eric W. Biederman 2013-01-25 16:48:31 -08:00
commit e11f0ae388
2 changed files with 21 additions and 0 deletions
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7
init/Kconfig
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@ -1035,6 +1035,13 @@ config USER_NS
help
This allows containers, i.e. vservers, to use user namespaces
to provide different user info for different servers.
When user namespaces are enabled in the kernel it is
recommended that the MEMCG and MEMCG_KMEM options also be
enabled and that user-space use the memory control groups to
limit the amount of memory a memory unprivileged users can
use.
If unsure, say N.
config PID_NS