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Date: Sun, 2 Apr 2023 19:23:44 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: Hanno Böck <hanno@...eck.de>
Cc: kernel-hardening@...ts.openwall.com
Subject: Re: [PATCH] Restrict access to TIOCLINUX
On Sun, Apr 02, 2023 at 07:16:52PM +0200, Hanno Böck wrote:
> On Sun, 2 Apr 2023 16:55:01 +0200
> Greg KH <gregkh@...uxfoundation.org> wrote:
>
> > You just now broke any normal user programs that required this (or the
> > other ioctls), and so you are going to have to force them to be run
> > with CAP_SYS_ADMIN permissions?
>
> Are you aware of such normal user programs?
> It was my impression that this is a relatively obscure feature and gpm
> is pretty much the only tool using it.
"Pretty much" does not mean "none" :(
> > And you didn't change anything for programs like gpm that already had
> > root permission (and shouldn't that permission be dropped anyway?)
>
> Well, you could restrict all that to a specific capability. However, it
> is my understanding that the existing capability system is limited in
> the number of capabilities and new ones should only be introduced in
> rare cases. It does not seem a feature probably few people use anyway
> deserves a new capability.
I did not suggest that a new capability be created for this, that would
be an abust of the capability levels for sure.
> Do you have other proposals how to fix this issue? One could introduce
> an option like for TIOCSTI that allows disabling selection features by
> default.
What exact issue are you trying to fix here?
thanks,
greg k-h
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