Re: [RFC] Add the "icebox"

["Rafael J. Wysocki" <rjw@sisk.pl>]

On Wednesday, 7 of November 2007, Alan Stern wrote:
> On Wed, 7 Nov 2007, Rafael J. Wysocki wrote:
> 
> > > P.S.: What about mutual exclusion in kernel/power/user.c?  If we stop 
> > > freezing user tasks, there's nothing to prevent more than one task 
> > > holding an open file reference to the snapshot file and submitting 
> > > ioctls concurrently.  Maybe the regions covered by pm_mutex should be 
> > > expanded.
> > 
> > /dev/snapshot can only be open once at a time.
> 
> What if a process opens /dev/snapshot and then forks a child?  Can't
> the parent and child processes make concurrent ioctl calls?

Well, that would be shooting yourself in a foot.

You can do many stupid things as root and this one is probably not the worst of
them after all. ;-)

Greetings,
Rafael