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    SubjectRe: [RFC][PATCH] Randomize kernel base address on boot
    On Fri, May 27, 2011 at 08:17:24PM +0200, Ingo Molnar wrote:
    > - Boot time dynamic randomization allows randomization of 'mass
    > install' systems, where the same image is used, to still be
    > randomized: for example a million phones all with the same Flash
    > ROM image and no 'install' performed at all on them.
    > With static randomization these systems will all have the same
    > kernel addresses.
    > - Boot time dynamic randomization allows read-only systems to still
    > be randomized: for example internet cafes that use some popular
    > pre-packaged kiosk-mode live-DVD. They probably wont bother
    > randomizing and relinking the ISOs per machine and burning per
    > machine DVDs ...

    These 2 points are pretty significant, IMO.

    And frankly, distros almost fall into these categories already. IIUC,
    a distro would need to ship all of the .o files from each config of the
    kernel they ship so each system could do the relinking. That's not a
    small foot print to suddenly add to base installs.


    Kees Cook
    Ubuntu Security Team

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