Re: Chroot bug

From: Alan Cox
Date: Wed Sep 26 2007 - 06:43:50 EST

> > The dot-dot entry in the root directory is interpreted to mean the
> > root directory itself. Thus, dot-dot cannot be used to access files
> > outside the subtree rooted at the root directory.

Which is behaviour chroot preserves properly.

The specification says explicitly

"The process working directory is unaffected by chroot()."

chroot is not and never has been a security tool. People have built
things based upon the properties of chroot but extended (BSD jails, Linux
vserver) but they are quite different.

You could probably write yourself an LSM module to do this too

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