Matthias Bethke wrote:

> Hi Vaeth, [...]
> > 
> > Also a chroot jail is not a security feature: There are several
> > ways known how to break out.
> 
> [...] But there's only one reason I can see why you'd use a
> chroot environment *except* for security and that's to have more than
> one set of system binaries active at the same time for different
> applications.

Or simply several systems (e.g. amd64 and x86, or gentoo and debian,
or your boot disk and your newly installed system [the install handbook
makes massive use of chroot]). This is exactly what chroot was made for.

> I'd say the vast majority of chroot jails are there for nothing
> else but security.

Alan Cox: "chroot is not and never has been a security tool", see e.g.
http://kerneltrap.org/Linux/Abusing_chroot


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