Re: udev and sysfs permissions

[Greg KH <greg@kroah.com>]

On Fri, May 20, 2005 at 10:06:24AM -0400, Jon Smirl wrote:
> On 5/20/05, Greg KH <greg@kroah.com> wrote:
> > Nope, the kernel is.  You must have provided enough memory pressure to
> > push the file out of the dcache, and then when you went to look at it
> > again, it was created on the fly from scratch again, with the proper
> > permissions (as the kernel thinks the files have.)  Nice to see it's all
> > working properly :)
> > 
> > > Can udev control sysfs permissions (I though it only controlled the
> > > device permissions).
> > 
> > No, only the kernel can control sysfs permissions.
> 
> We were planning on having PAM assign ownership of the video device
> and sysfs attributes to the logged in user.

video device, fine.  sysfs attributes, no.

> I need read/write access to the sysfs attributes but it need to be
> restricted to whoever owns the device.

Ick.  what kind of attributes do you want the logged in user to be able
to change?

> What's the right way to implement this?

we do have a function to change the mode of the file on the fly, but in
general, I think you might need to just write a small helper program to
mediate access properly.

Good luck,

greg k-h


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