Am Dienstag, den 04.08.2015, 12:14 -0700 schrieb Greg KH:
> On Tue, Aug 04, 2015 at 08:55:38PM +0200, Stefan Koch wrote:
> > Am Montag, den 03.08.2015, 15:06 -0700 schrieb Greg KH:
> > > On Thu, Jul 30, 2015 at 08:19:19AM +0200, Stefan Koch wrote:
> > > > Interfaces are allowed per default.
> > > > This can disabled or enabled (again) by writing 0 or 1 to
> > > > /sys/bus/usb/devices/usbX/interface_authorized_default
> > > >
> > > > Signed-off-by: Stefan Koch <skoch@xxxxxxx>
> > > > ---
> > > > drivers/usb/core/hcd.c | 47 ++++++++++++++++++++++++++++++++++++++++++++++
> > > > drivers/usb/core/message.c | 1 +
> > > > include/linux/usb/hcd.h | 3 +++
> > > > 3 files changed, 51 insertions(+)
> > > >
> > > > diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
> > > > index cbcd092..84b5923 100644
> > > > --- a/drivers/usb/core/hcd.c
> > > > +++ b/drivers/usb/core/hcd.c
> > > > @@ -882,9 +882,53 @@ static ssize_t authorized_default_store(struct device *dev,
> > > > }
> > > > static DEVICE_ATTR_RW(authorized_default);
> > > >
> > > > +/*
> > > > + * interface_authorized_default_show - show default authorization status
> > > > + * for USB interfaces
> > > > + *
> > > > + * note: interface_authorized_default is the default value
> > > > + * for initializing the authorized attribute of interfaces
> > > > + */
> > > > +static ssize_t interface_authorized_default_show(struct device *dev,
> > > > + struct device_attribute *attr, char *buf)
> > > > +{
> > > > + struct usb_device *usb_dev = to_usb_device(dev);
> > > > + struct usb_hcd *hcd = bus_to_hcd(usb_dev->bus);
> > > > +
> > > > + return sprintf(buf, "%u\n", !!HCD_INTF_AUTHORIZED(hcd));
> > > > +}
> > > > +
> > > > +/*
> > > > + * interface_authorized_default_store - store default authorization status
> > > > + * for USB interfaces
> > > > + *
> > > > + * note: interface_authorized_default is the default value
> > > > + * for initializing the authorized attribute of interfaces
> > > > + */
> > > > +static ssize_t interface_authorized_default_store(struct device *dev,
> > > > + struct device_attribute *attr, const char *buf, size_t count)
> > > > +{
> > > > + struct usb_device *usb_dev = to_usb_device(dev);
> > > > + struct usb_hcd *hcd = bus_to_hcd(usb_dev->bus);
> > > > + int rc = count;
> > > > + bool val;
> > > > +
> > > > + if (strtobool(buf, &val) != 0)
> > > > + return -EINVAL;
> > > > +
> > > > + if (val)
> > > > + set_bit(HCD_FLAG_INTF_AUTHORIZED, &hcd->flags);
> > > > + else
> > > > + clear_bit(HCD_FLAG_INTF_AUTHORIZED, &hcd->flags);
> > > > +
> > > > + return rc;
> > > > +}
> > > > +static DEVICE_ATTR_RW(interface_authorized_default);
> > > > +
> > > > /* Group all the USB bus attributes */
> > > > static struct attribute *usb_bus_attrs[] = {
> > > > &dev_attr_authorized_default.attr,
> > > > + &dev_attr_interface_authorized_default.attr,
> > > > NULL,
> > > > };
> > > >
> > > > @@ -2682,6 +2726,9 @@ int usb_add_hcd(struct usb_hcd *hcd,
> > > > hcd->authorized_default = authorized_default;
> > > > set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
> > > >
> > > > + /* per default all interfaces are authorized */
> > > > + set_bit(HCD_FLAG_INTF_AUTHORIZED, &hcd->flags);
> > > > +
> > > > /* HC is in reset state, but accessible. Now do the one-time init,
> > > > * bottom up so that hcds can customize the root hubs before hub_wq
> > > > * starts talking to them. (Note, bus id is assigned early too.)
> > > > diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
> > > > index f368d20..3d25d89 100644
> > > > --- a/drivers/usb/core/message.c
> > > > +++ b/drivers/usb/core/message.c
> > > > @@ -1807,6 +1807,7 @@ free_interfaces:
> > > > intfc = cp->intf_cache[i];
> > > > intf->altsetting = intfc->altsetting;
> > > > intf->num_altsetting = intfc->num_altsetting;
> > > > + intf->authorized = !!HCD_INTF_AUTHORIZED(hcd);
> > >
> > >
> > >
> > > > kref_get(&intfc->ref);
> > > >
> > > > alt = usb_altnum_to_altsetting(intf, 0);
> > > > diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
> > > > index c9aa779..7b8ddae 100644
> > > > --- a/include/linux/usb/hcd.h
> > > > +++ b/include/linux/usb/hcd.h
> > > > @@ -120,6 +120,7 @@ struct usb_hcd {
> > > > #define HCD_FLAG_WAKEUP_PENDING 4 /* root hub is resuming? */
> > > > #define HCD_FLAG_RH_RUNNING 5 /* root hub is running? */
> > > > #define HCD_FLAG_DEAD 6 /* controller has died? */
> > > > +#define HCD_FLAG_INTF_AUTHORIZED 8 /* authorize interfaces? */
> > >
> > > Again, what happened to this being '7'? Don't skip bits for no reason.
> > >
> > > thanks,
> > >
> > > greg k-h
> >
> > Because this reason patch 7 was developed. It changes the device
> > authorization to use a flag with the desired number 6.
>
> "6"?
Sorry desired was "7". Parch 7 introduces flag nr. "7"
+#define HCD_FLAG_DEV_AUTHORIZED 7 /* authorize
devices? */
#define HCD_FLAG_INTF_AUTHORIZED 8 /* authorize interfaces?
*/
>
> > Is this ok or not?
>
> In reading these patches in the order you have sent them, no, it's not,
> I'm totally confused,
The reason for choosing 7 for dev auth was that the device authorization
was there before the interface autorization (it is the "parent").
So what do you prefer?
a) 8 for dev auth, 7 for intf auth and submit the dev auth change as
last patch
b) 7 for dev auth, 8 for intf auth (as is) and submit the dev auth
change as first patch
c) 7 for dev auth, 8 for intf auth and submit the dev auth change as
first patch
>
> greg k-h
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