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SubjectRe: [RCF] [PATCH] unprivileged mount/umount
> Right but this fix disallows fchdir into a directory belonging to
> a different namespace. And hence would disallow the ability to
> cross mount across namespaces.

A helper can still pass file handles for you, you've changed the
semantics a little (and I'm not clear if there is a need to) but I don't
see it serves any fundamental purpose. Historical experience is that
chroot exiting via fchdir is actually useful

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