Re: pull request: bluetooth 2012-05-04

Hi,

On Sat, May 12, 2012, Gustavo Padovan wrote:

In my point of view there are two commits there that are really necessary:

Gustavo Padovan (2):
      Bluetooth: report the right security level in getsockopt

Johan Hedberg (2):
      Bluetooth: mgmt: Fix device_connected sending order

They fix a userspace breakage caused by:

Author: Marcel Holtmann [off-list ref]
Date:   Mon Feb 20 21:24:37 2012 +0100

    Bluetooth: Always enable management interface
    
    The management interface API has reached stable version 1.0 and thus
    it can now be always enabled. All future changes will be made backwards
    compatible.
    
    Signed-off-by: Marcel Holtmann [off-list ref]
    Signed-off-by: Johan Hedberg [off-list ref]


This cause no crash, but it make bluetooth keyboards stop to work with Linux.
This a serious breakage IMO. I really would like to see at least these two
patches in. The other fixes can wait.

I'd just like to add some further background since I don't think it's
that obvious how these are regression fixes:

The device_connected fix should be quite self-explanatory, but it's
actually a wider issue than just for keyboards. All profiles that do
incoming connection authorization (e.g. headsets) will break without it
with specific hardware. The reason it wasn't caught earlier is that it
only occurs with specific Bluetooth adapters.

As for the security level patch, this fixes L2CAP socket based security
level elevation during a connection. The HID profile needs this (for
keyboards) and it is the only way to achieve the security level
elevation when using the management interface to talk to the kernel
(hence the management enabling patch being the one that exposes this
issue).

Johan