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SubjectRe: [PATCH] root-hopping for pre-2.3.41-3
almesber@lrc.di.epfl.ch wrote:
>
> H. Peter Anvin wrote:
> > Matthew Kirkwood wrote:
> > > 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.
>
> cwd needs to be changed too, along with root. But I only touch them if
> they are exactly at the current root. If something cared enough to
> change them in the first place, it's probably wrong to touch them.
>
> Also, anything but root and cwd (i.e. open files, opendir'ed directories,
> executables, shared libraries, etc.) is not touched. You can get rid of
> most of the nasty stuff with a simple exec, or by killing the process.
>
> Fortunately, the most common cases, i.e. the /linuxrc script (or some
> equivalent - we don't have to use a hard-coded name anymore) and kernel
> threads are just where we need them. Also, the latter usually don't
> access files anyway.
>

Then why not just let this be done in userspace (chdir, chroot, exec)?

-hpa

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

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