Re: [RFC][PATCH-2.4] Prevent mounting on ".."

From: Arjan van de Ven (arjanv@redhat.com)
Date: Sun Jun 29 2003 - 09:09:40 EST

On Sun, 2003-06-29 at 15:09, Willy TARREAU wrote:
> Hi Al and Marcelo,
>
> while I was trying to get maximum restrictions on a chroot on 2.4.21-pre,
> I found that it's always possible to mount a ramfs or a tmpfs on "..",
> and then upload whatever I wanted in it. It's a shame because I was
> trying to isolate network daemons inside empty, read-only file-systems,
> and I discovered that this effort was worthless. To resume, imagine a
> network daemon which does :

well...
you need to be root to mount. If you're root you can break out of a
chroot anyway....


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