From mboxrd@z Thu Jan 1 00:00:00 1970 From: Greg Kroah-Hartman Subject: Re: [PATCH] USB: input: powermate: fix oops with malicious USB descriptors Date: Mon, 14 Mar 2016 10:07:10 -0700 Message-ID: <20160314170710.GA619@kroah.com> References: <1457964773-29512-1-git-send-email-jwboyer@fedoraproject.org> <20160314161548.GA2585@kroah.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-usb-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Josh Boyer Cc: Dmitry Torokhov , linux-input-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Linux USB Mailing List , "Linux-Kernel@Vger. Kernel. Org" , stable , Oliver Neukum List-Id: linux-input@vger.kernel.org On Mon, Mar 14, 2016 at 12:46:26PM -0400, Josh Boyer wrote: > On Mon, Mar 14, 2016 at 12:15 PM, Greg Kroah-Hartman > wrote: > > On Mon, Mar 14, 2016 at 10:12:53AM -0400, Josh Boyer wrote: > >> The powermate driver expects at least one valid USB endpoint in its > >> probe function. If given malicious descriptors that specify 0 for > >> the number of endpoints, it will crash. Validate the number of > >> endpoints on the interface before using them. > >> > >> The full report for this issue can be found here: > >> http://seclists.org/bugtraq/2016/Mar/85 > >> > >> Reported-by: Ralf Spenneberg > >> Cc: stable > >> Signed-off-by: Josh Boyer > >> --- > >> drivers/input/misc/powermate.c | 3 +++ > >> 1 file changed, 3 insertions(+) > > > > I'll queue these up after 4.6-rc1 is out as the merge window is closed > > right now, but we might want to think about a better way to handle this > > type of thing in the USB core. A way to keep from having to add checks > > like this for every single driver, when the driver shouldn't even really > > have their probe function called unless their expected endpoints are > > going to be there. > > I thought this discussion came up a while ago, when something very > similar was fixed in the whiteheat driver (commit cbb4be652d374). I > can't find the thread at the moment, but I thought someone said this > had to be per-driver for some reason. I'm more than happy to have a > core subsystem fix if it's possible. > > > I'll think about that over the next few weeks... > > I have something around 8 drivers with issues like this. I think > Oliver (now CC'd) is working from the same set of bugs. Should we > hold off on submitting individual fixes until later, or should we go > ahead and submit them? Please submit them, that will give us a framework to be able to figure out the specifics of what needs to be changed. thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html