# Re: \[PATCH v3\] thunderbolt: For dev authorization changes, include the actual event in udev change notification

- From: Rajat Jain \<hidden\>
- Date: 2021-08-02 18:49:59 
- List: linux-usb
- Page: https://ratatoskr.run/linux-usb/2021/08/1465678
- Thread: https://ratatoskr.run/linux-usb/2021/07/1463796/t.md

```text
On Mon, Aug 2, 2021 at 8:07 AM Mika Westerberg
[ref] wrote:
>
> Hi Rajat,
>
> On Fri, Jul 30, 2021 at 04:53:04PM -0700, Rajat Jain wrote:
> > For security, we would like to monitor and track when the thunderbolt
> > devices are authorized and deauthorized (i.e. when the thunderbolt sysfs
> > "authorized" attribute changes). Currently the userspace gets a udev
> > change notification when there is a change, but the state may have
> > changed (again) by the time we look at the authorized attribute in
> > sysfs. So an authorization event may go unnoticed. Thus make it easier
> > by informing the actual change (new value of authorized attribute) in
> > the udev change notification.
> >
> > The change is included as a key value "authorized=<val>" where <val>
> > is the new value of sysfs attribute "authorized", and is described at
> > Documentation/ABI/testing/sysfs-bus-thunderbolt under
> > /sys/bus/thunderbolt/devices/.../authorized
> >
> > Signed-off-by: Rajat Jain <redacted>
>
> I did some tiny changes to the title, commit message and the comment and
> applied to thunderbolt.git/next, thanks!

Thank you!

Rajat
```