Date: Fri, 8 Aug 2014 22:50:59 +0400 From: gremlin@...mlin.ru To: oss-security@...ts.openwall.com Subject: Re: BadUSB discussion On 08-Aug-2014 22:27:16 +0400, (GalaxyMaster) wrote: > Alexey, Aye, Dmitry? :-) >>> That doesn't prevent any other USB HID device from being plugged >>> in and instantly working. Which again, you can prevent if you >>> want to, but no one seems to do that... >> Hmmm... To avoid possible confusion: that was CONFIG_USB_KBD - >> "USB HIDBP Keyboard (simple Boot) support", and CONFIG_USB_HID >> was turned off. > I think Greg was referring to kernel's feature of controlling > power on USB ports (e.g. you can just switch of power for a port > and nothing you insert there will have a chance to work until > you instruct the kernel to switch the port back on). That may be good for servers, but almost unusable on worstations: people tend to charge mobile devices while they work. Personally I'd like to be able to shorten D+ and D- lines for all unused ports and keep them in "charge-only" state. However, that'll require disconnecting them from the socket to get this scheme: Host Device VCC ---------------- VCC D- ---+ +--- D- | | D+ ---+ +--- D+ GND ---------------- GND It is possible, but adding even a single component to a system board causes a marketoids' butthurt. >> Bus 002 Device 064: ID 046d:c016 Logitech, Inc. Optical Wheel >> Mouse >> Device IDs tell us the hub was reset several times :-) > ... or somebody insanely was plugging mouse in and out in a > cycle :) That device wasn't a mouse, but I really appreciate your idea :-) -- Alexey V. Vissarionov aka Gremlin from Kremlin <gremlin ПРИ gremlin ТЧК ru> GPG: 8832FE9FA791F7968AC96E4E909DAC45EF3B1FA8 @ hkp://keys.gnupg.net
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