Re: Scrub dm-crypt keys on reboot?

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2008/2/22, Arno Wagner <wagner@xxxxxxxxxxxxxx>:
>  Would be nice to have, but is technologically infeasible.
>  The attack relies on hard-reset. This stops everything in its
>  tracks. No additional code can be executed.

This doesn't mean it shouldn't be done on a controlled shutdown/reboot.
Several userland tools scrub memory used for storing key material even
though they've been mlock'd. Why shouldn't the kernel do the same when
they're not needed anymore?

  -- noah

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