Subject: Re: chroot(2)
To: None <>
From: der Mouse <mouse@Rodents.Montreal.QC.CA>
List: tech-kern
Date: 10/02/1998 20:55:37
> if users can use chroot...then it follows [...]

> it seems to me that simply disabling suid executables in chrooted
> environments would work quite well against this.

Yes, it would.

> something like checking
> curproc->p_fd->fd_rdir <=> proc0->p_fd->fd_rdir would tell you if it
> was chrooted, eh?

Yes, it would.

However, if *root* did the chroot, there's no need to disable set-id.
That's why I proposed a separate state bit for the process, indicating
that it has done a non-root chroot.  (Root processes that want to
chroot and then become non-root and drop ability to set-id can do it by
doing a chroot("/") after becoming non-root.)

					der Mouse

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