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usb: core: Make default authorization mode configurable

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Make the default USB device authorization mode configurable at build
time. This is useful for systems that require a mode that is stricter
than the standard setting, as it avoids relying on the kernel command
line being properly set.

Signed-off-by: Niko Mauno <niko.mauno@vaisala.com>
Link: https://lore.kernel.org/r/20240105114956.30714-2-niko.mauno@vaisala.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Niko Mauno 2024-01-05 13:49:56 +02:00 committed by Greg Kroah-Hartman
parent aa6e11e9a7
commit bec7e43b16
2 changed files with 18 additions and 1 deletions
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17
drivers/usb/core/Kconfig
View file

@ -116,3 +116,20 @@ config USB_AUTOSUSPEND_DELAY
The default value Linux has always had is 2 seconds. Change
this value if you want a different delay and cannot modify
the command line or module parameter.
config USB_DEFAULT_AUTHORIZATION_MODE
int "Default authorization mode for USB devices"
range 0 2
default 1
depends on USB
help
Select the default USB device authorization mode. Can be overridden
with usbcore.authorized_default command line or module parameter.
The available values have the following meanings:
0 is unauthorized for all devices
1 is authorized for all devices (default)
2 is authorized for internal devices
If the default value is too permissive but you are unsure which mode
to use, say 2.

2
drivers/usb/core/hcd.c
View file

@ -357,7 +357,7 @@ static const u8 ss_rh_config_descriptor[] = {
#define USB_AUTHORIZE_ALL 1
#define USB_AUTHORIZE_INTERNAL 2
static int authorized_default = USB_AUTHORIZE_ALL;
static int authorized_default = CONFIG_USB_DEFAULT_AUTHORIZATION_MODE;
module_param(authorized_default, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(authorized_default,
"Default USB device authorization: 0 is not authorized, 1 is authorized (default), 2 is authorized for internal devices, -1 is authorized (same as 1)");