Re: [PATCH] HID: Bluetooth: hidp: buffer overflow in hidp_process_report

[Greg KH]

On Wed, Aug 01, 2018 at 09:41:04AM -0700, Mark Salyzyn wrote:
> On 08/01/2018 09:37 AM, Greg KH wrote:
> > On Tue, Jul 31, 2018 at 03:02:13PM -0700, Mark Salyzyn wrote:
> > > CVE-2018-9363
> > > 
> > > The buffer length is unsigned at all layers, but gets cast to int and
> > > checked in hidp_process_report and can lead to a buffer overflow.
> > > Switch len parameter to unsigned int to resolve issue.
> > > 
> > > This affects 3.18 and newer kernels.
> > > 
> > > Signed-off-by: Mark Salyzyn <salyzyn@xxxxxxxxxxx>
> > > Fixes: a4b1b5877b514b276f0f31efe02388a9c2836728 ("HID: Bluetooth: hidp: make sure input buffers are big enough")
> > > Cc: Marcel Holtmann <marcel@xxxxxxxxxxxx>
> > > Cc: Johan Hedberg <johan.hedberg@xxxxxxxxx>
> > > Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
> > > Cc: Kees Cook <keescook@xxxxxxxxxxxx>
> > > Cc: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
> > > Cc: linux-bluetooth@xxxxxxxxxxxxxxx
> > > Cc: netdev@xxxxxxxxxxxxxxx
> > > Cc: linux-kernel@xxxxxxxxxxxxxxx
> > > Cc: security@xxxxxxxxxx
> > > Cc: kernel-team@xxxxxxxxxxx
> > Nit, you only need to bother security@ if you do not have a fix and need
> > to figure out one.
> 
> Thanks, I thought anything with a CVE was to go there according to netdev
> FAQ (dropped security from response list).
> > Also, you forgot to cc: stable@xxxxxxxxxxxxxxx to be included in older
> > kernel releases :(
> netdev FAQ said to _not_ copy stable, I am so confused ;-{ (added stable to
> response list b/c patch is now taken into bluetooth-next)

Ah, well, bluetooth is a bit not normal here, usually stuff that ends up
in a subsystem tree before netdev needs to have a cc: stable on it for
me to catch it.  Hopefully the bluetooth maintainers are on it :)

thanks,

greg k-h