Re: [BProc] beowulf demo cluster

[Erik A. H. <er...@he...>]

On Tue, Oct 09, 2001 at 11:21:21AM +0200, Janez Pers wrote:
> Another question: it seems everything is working now, but only if
> I login as root (not surprisingly, as the whole installation was done
> with root permisions).
> 
> Somewhere in the docs it was stated that the whole system should work
> even without root permisions. However, executing /usr/sbin/bpmaster
> as ordinary user gives following error message:

The system works *for* non-root users but it cannot (well, should
not...) be run by non-root users.  What this means is root needs to
run the daemons but after that anybody can call bproc_move(), etc.

> mmap: permission denied.
> 
> This is not critical, as I intend to load the modules and the master
> daemon during the system startup.
> 
> However, running /usr/sbin/bpslave <ip> <port> refused to run with:
> 
> bindresvport: permission denied (ignoring)
> /dev/bproc: permission denied
> 
> After I changed the permissions of /dev/bproc with chmod g+rw /dev/bproc
> and chgrp /dev/bproc users (I don't know, was that a very stupid thing?)
>
> the bpslave still refuses to run with:
> 
> bindresvport: permission denied (ignoring)
> /dev/bproc: operation not permitted

All these problems are related to not being root.  Trying to chmod
things to the point where anybody can run them is a very bad idea.  It
creates a huge gaping security hole.  (newer revs of bproc remove
/dev/bproc and doing that kind of thing isn't even an option...)

- Erik
-- 
Erik Arjan Hendriks          Printed On 100 Percent Recycled Electrons
er...@he...                   Contents may settle during shipment