Re: [uml-devel] The source to that firmware-uml thing is now up...

[Henrik Nordstrom <uml@hno.marasystems.com>]

On Wed, 20 Apr 2005, Rob Landley wrote:

> By the way, I've toyed with the idea of running this sucker in an otherwise
> empty chroot environment (/proc/self/fd is likely to exist and have fairly
> uninteresting contents.  As a chroot environment, it just has symlinks that
> point to nothing), but to chroot the UML kernel process from inside the
> initramfs, I need to come up with a new syscall.

Not neccesarily. All you need is a way of making the UML execute the 
chroot syscall. This can be easily be done by loading a module, or even 
linking a dummy object file with just a kernel init function making the 
chroot call if it is not sensitive when in the kernel boot process this 
takes place.

> Can't do it before running the UML kernel because A) it needs to make 
> its memory file, 2) it needs to access /proc/self/exe, III) it needs to 
> loopback mount its executable file to pull the trick I just did.

Ok, then the module approach is the simplest.

> Does a new "chroot UML" syscall sound like a worthwhile idea?

IMHO a syscall is overkill for this.

Regards
Henrik



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