Fwd: Re: [sane-devel] permanent calibration files

[Andre Herms]

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> Hi,
>
> On Fri, Feb 08, 2002 at 09:53:36AM -0800, nathan rutman wrote:
> > Where's the right place to store a permanent calibration file (created
> > once per scanner)?  Is there a facility for this?  Looks like
> > hp-option.c stores one in ~/.sane/calib-hp:device, but
> > a) I want mine per scanner, not per user.
>
> This means there must be some place in the file system writable by
> everyone. Maybe /tmp? At least I don't know a differnt place. But if
> you use this, be really carefull to not introduce yet another temp
> file race. And be sure that the backend doesn't segfault if the data
> is too short, too long or just wrong in any kind. You can't know who
> wrote the file if everyone can access it.

Just a warning. I had the same problem. But my scanner has some problems with
certain calibration values. I once forgot to calculate the data and used
undefined memory. As a result the scanner became completely unusable. The
only way to fix it was to run the windows driver.
What I want to say: If the data is writable for all users you could have a
really big security problem - it could damage your hardware. I think the only
secure way then is to use saned or recalculate it every time.

Bye
	Andre

- -- 
Andre Herms                   mailto:aherms@cs.uni-magdeburg.de
                              http://www.cs.uni-magdeburg.de/~aherms
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