On Tue, Oct 07, 2014 at 04:12:57PM +0400, Andrey Vagin wrote:
> Another problem is that rootfs can't be hidden from a container, because
> rootfs can't be moved or umounted.
... which is a bug in mntns_install(), AFAICS.
> Here is an example how to get access to rootfs:
> fd = open("/proc/self/ns/mnt", O_RDONLY)
> umount2("/", MNT_DETACH);
> setns(fd, CLONE_NEWNS)
>
> rootfs may contain data, which should not be avaliable in CT-s.
Indeed.
> I suggest to add ability to create a mount namespace with specified
> mount points. A current task root can be used as a root for the new
> mount namespace.
Yecchh... Frankly, you are opening a big can of worms - having rootfs
as absolute root of all namespaces simplifies a lot of things in there.
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