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    SubjectvsyscallRe: X15 alpha release: as fast as TUX but in user space (fwd)
    Hi!

    > > That means that for fooling closed-source statically-linked binary,
    > > you now need to patch kernel. That's regression; subterfugue.org could
    > > do this with normal user rights in 2.4.0.
    >
    > This is particularly pretty, but something that might work:
    >
    > 1. a "deceiver" process creates a shared memory page, populates shared
    > page with appropriate magic (perhaps copying from its own magic page?)
    > 2. have subterfuge unmap the magic page for the fooled process, and map in
    > the shared page in its place (assumes subterfuge can insert system
    > calls, instead of just modifying them)

    subterfugue can insert calls just fine; just I'm not sure if vsyscall
    implementation will let you unmap magic page.

    > 3. deceiver periodically updates magic page

    This is going to be the hard part.

    --
    Philips Velo 1: 1"x4"x8", 300gram, 60, 12MB, 40bogomips, linux, mutt,
    details at http://atrey.karlin.mff.cuni.cz/~pavel/velo/index.html.

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