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    SubjectRe: Dual-Licensing Linux Kernel with GPL V2 and GPL V3
    On Thu, 21 Jun 2007, Lennart Sorensen wrote:

    > On Thu, Jun 21, 2007 at 10:26:04AM -0700, david@lang.hm wrote:
    >> the bios doesn't have enough capability to talk to the outside world for
    >> updates.
    >
    > Of course, although perhaps it could. More likely my thought was that
    > the service when it decides to download an update, would include the
    > updated bios image and put it on the boot drive where the existing bios
    > can find it. No signature needs to be added to the boot drive or
    > kernel, just checksums in the bios image.
    >
    >> what tivo actually does is very similar to this
    >>
    >> they encode into the bios the ability to check a checksum/signature for
    >> the kernel+boot filesystem and if they don't match look to see if there is
    >> another kernel+boot filesystem available
    >>
    >> then software on the boot filesystem checks to see if the rest of the
    >> system has been tampered with before it mounts /

    you snippede the bit about not knowing how to stop it

    >> the GPLv3 is trying to do this.
    >
    > Perhaps they should just explicitly say that then.

    they call the section the anti-tivoization, how much more explicit can
    they get?

    David Lang

    by the way, just in case anyone is misunderstanding me. I don't believe
    for a moment that all these anti-tamper features actually work in the real
    world (the PS3 hacking kits are proof of the lengths people will go to to
    make the 'hard' hardware-level hacking trivial to do) but the approach
    needs to be at secure modulo hardware tampering or software bugs.

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