Re: Scheduler fixes for hyperthreading

From: Colin Percival (cperciva_at_freebsd.org)
Date: 05/22/05

  • Next message: Bruce Evans: "Re: Scheduler fixes for hyperthreading" 
    Date: Sat, 21 May 2005 22:14:06 -0700
To: Sam Lawrance <boris@brooknet.com.au>

    Sam Lawrance wrote:
    > On Sat, 2005-05-21 at 22:04 -0700, Colin Percival wrote:
    >>Sam Lawrance wrote:
    >>>I'm just curious here... would the mac_seeotheruids policy help in
    >>>obscuring the value of any information collected by a spy process?
    >>
    >>Yes. It would mean that the spy could steal an SSL certificate, but
    >>not know whose SSL certificate it was. :-)
    >
    > Can the spy be sure that it's not just stealing fortunes though?
    >
    > I mean for example, can the cache timings shown on page 7 of your paper
    > be used to reliably identify what the other thread on the CPU is?

    Yes. The patterns are very distinctive.

    Colin Percival
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  • Next message: Bruce Evans: "Re: Scheduler fixes for hyperthreading"