diff options
| author | Dmitry Torokhov <dtor@chromium.org> | 2019-02-16 23:21:51 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-02-22 09:27:55 +0100 |
| commit | 7bae0432a64aa7569dbd0feb2927fd3ff913901f (patch) | |
| tree | 6af0b4f35bb5eb87326f546a18597c00d06942a2 /Documentation | |
| parent | ca942a0ed019f98c156cdb3de78b3d76bf381b12 (diff) | |
| download | linux-7bae0432a64aa7569dbd0feb2927fd3ff913901f.tar.bz2 | |
usb: core: add option of only authorizing internal devices
On Chrome OS we want to use USBguard to potentially limit access to USB
devices based on policy. We however to do not want to wait for userspace to
come up before initializing fixed USB devices to not regress our boot
times.
This patch adds option to instruct the kernel to only authorize devices
connected to the internal ports. Previously we could either authorize
all or none (or, by default, we'd only authorize wired devices).
The behavior is controlled via usbcore.authorized_default command line
option.
Signed-off-by: Dmitry Torokhov <dtor@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 3 | ||||
| -rw-r--r-- | Documentation/usb/authorization.txt | 4 |
2 files changed, 5 insertions, 2 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 858b6c0b9a15..2d28ef850781 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -4697,7 +4697,8 @@ usbcore.authorized_default= [USB] Default USB device authorization: (default -1 = authorized except for wireless USB, - 0 = not authorized, 1 = authorized) + 0 = not authorized, 1 = authorized, 2 = authorized + if device connected to internal port) usbcore.autosuspend= [USB] The autosuspend time delay (in seconds) used diff --git a/Documentation/usb/authorization.txt b/Documentation/usb/authorization.txt index f901ec77439c..9dd1dc7b1009 100644 --- a/Documentation/usb/authorization.txt +++ b/Documentation/usb/authorization.txt @@ -34,7 +34,9 @@ $ echo 1 > /sys/bus/usb/devices/usbX/authorized_default By default, Wired USB devices are authorized by default to connect. Wireless USB hosts deauthorize by default all new connected devices (this is so because we need to do an authentication phase -before authorizing). +before authorizing). Writing "2" to the authorized_default attribute +causes kernel to only authorize by default devices connected to internal +USB ports. Example system lockdown (lame) |