[PATCH] root-hopping for pre-2.3.41-3

[H. Peter Anvin]

Matthew Kirkwood wrote:
> 
> On Tue, 25 Jan 2000, H. Peter Anvin wrote:
> 
> > > >        pivot_root("new_root", "old_root");
> > >
> > > ... with an implicit "chroot everybody on / to /new_root". That would
> > > solve a few problems, yes. I'll give it a try.
> >
> > Right... everyone on the old / move to the new /, although I guess
> > that's technically not 100% necessary.
> 
> Even possible?
> 
> Where does someone in /boot end up when there is no /new_root/boot?
> 

I think we were talking about the root, not the cwd.  However, the same
issues apply.  I think the cleanest is to not do anything, although it
may have some serious problems.

For the normal case where you'd have no processes except a pseudo-init
running, you'd just do chdir("/"); chroot("/");  before you
execl("/sbin/init", "init", 0); but I don't know if there are other
applications in which it would be an issue.

-- 
<hpa en transmeta.com> at work, <hpa en zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."

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