For the cases of having a multi-function device which also acts as a
keyboard we could potentially ask whether the user really wants to use
it. This just needs to keep in mind that there are many legitimate
devices which look very similar -- headsets often have buttons (which
manifest as evdev devices, i. e. similar to keyboards, but you can tell
them apart via their event mask), or Yubikeys which are legitimately USB
keyboards to enter passwords, etc. -- These dialog boxes must have a
very low false positive ratio, or people will quickly start ignoring
them just like they get conditioned to ignore pretty much every other
security dialog (policykit, Firefox untrusted certificates, and what
not).

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https://bugs.launchpad.net/bugs/1393612

Title:
  Protect against BadUSB device

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