Re: [PATCH] [RFC] mnt: add ability to clone mntns starting with the current root

[Andy Lutomirski]

On Tue, Oct 7, 2014 at 3:42 PM, Eric W. Biederman <ebiederm@xxxxxxxxxxxx> wrote:
> Andy Lutomirski <luto@xxxxxxxxxxxxxx> writes:
>
>> On Tue, Oct 7, 2014 at 2:42 PM, Eric W. Biederman <ebiederm@xxxxxxxxxxxx> wrote:
>>>
>>> I am squinting and looking this way and that but while I can imagine
>>> someone more clever than I can think up some unique property of rootfs
>>> that makes it a little more exploitable than just mounting a ramfs,
>>> but since you have to be root to exploit those properties I think the
>>> game is pretty much lost.
>>
>> Yes.  rootfs might not be empty, it might have totally insane
>> permissions, and it's globally shared, which makes it into a wonderful
>> channel to pass things around that shouldn't be passed around.
>
> But if only root with proc mounted can reach it...  I don't know.

It doesn't have to be global root.  It could be userns root.

> There might be a case for setting MNT_LOCKED when we overmount "/"
> as root but I don't yet see it.
>
>> Can non-root do this?  You'd need to be in a userns with a "/" that
>> isn't MNT_LOCKED.  Can this happen on any normal setup?
>>
>> FWIW, I think we should unconditionally MNT_LOCKED the root on userns
>> unshare, even if it's the only mount.
>
> To the best of my knowledge MNT_LOCKED is set uncondintially on userns
> unshare.

Only if list_empty(&old->mnt_expire), whatever that means, I think.

--Andy
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