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vfs: Only support slave subtrees across different user namespaces
Sharing mount subtress with mount namespaces created by unprivileged users allows unprivileged mounts created by unprivileged users to propagate to mount namespaces controlled by privileged users. Prevent nasty consequences by changing shared subtrees to slave subtress when an unprivileged users creates a new mount namespace. Acked-by: Serge Hallyn <firstname.lastname@example.org> Signed-off-by: "Eric W. Biederman" <email@example.com>
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