Re: [PATCH 12/18] shared mount handling: bind and rbind

[Miklos Szeredi]

> > > Shouldn't chroot jail you?
> > 
> > No, chroot should just change the root.
> > 
> > If you don't want to be able to get back the old root, just close all
> > file descriptors _in addition_ to chroot() and chdir().
> 
> hah.  As long as you're running as root, chroot() again to a directory
> below you, and you effectively broken the chroot and can make a relative
> path to the old root. :)

... AND do 'setuid(nonroot)'.  Root can get out of a chroot() jail in
much more interesting ways.

Miklos
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