Re: [PATCH v2 1/2] tty: tty_io: update timestamps on all device nodes

Greg KH
2023-06-13T10:25:39Z

On Thu, Jun 08, 2023 at 07:52:54PM +0200, Michal Sekletar wrote:
> On Thu, Jun 8, 2023 at 1:51 PM Greg KH <gregkh@linuxfoundation.org> wrote:
>
> > So how are you protecting this from being an information leak like we
> > have had in the past where you could monitor how many characters were
> > being sent to the tty through a proc file? Seems like now you can just
> > monitor any tty node in the system and get the same information, while
> > today you can only do it for the tty devices you have permissions for,
> > right?
>
> Hi Greg,
>
> I am not protecting against it in any way, but proposed changes are only
> about timestamp updates which still happen in at least 8 seconds intervals
> so exact timing of read/writes to tty can't be inferred. Frankly, I may
> have misunderstood something. It would be great if you could mention a bit
> more details about CVE you had in mind.

Ah, I missed that this is in 8 second increments, nevermind then!

thanks,

greg k-h