Messages in this thread | | | Date | Mon, 14 Mar 2016 10:07:10 -0700 | From | Greg Kroah-Hartman <> | Subject | Re: [PATCH] USB: input: powermate: fix oops with malicious USB descriptors |
| |
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 > <gregkh@linuxfoundation.org> 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 <ralf@spenneberg.net> > >> Cc: stable <stable@vger.kernel.org> > >> Signed-off-by: Josh Boyer <jwboyer@fedoraproject.org> > >> --- > >> 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
| |