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    SubjectRe: Linux 2.2.18pre21
    Peter Samuelson wrote:
    >
    > [I wrote]
    > > > mkdir("foo")
    > > > chroot("foo")
    >
    > [H. Peter Anvin]
    > > BUG: you *MUST* chdir() into the chroot jail before it does you any
    > > good at all!
    >
    > No, it wasn't a bug! It was a demonstration. The above code is
    > executed not by the application but by the *attacker* who has managed
    > to 0wn the existing jail.
    >
    > Doing the additional chroot("foo") without already being in "foo"
    > basically replaces the chroot jail you *were* in, so you are now out.
    >
    > The sequence I posted is just the simplest un-chroot procedure I know,
    > to explain why chroot cannot sandbox the superuser.
    >

    Right. Gotcha.

    --
    <hpa@transmeta.com> at work, <hpa@zytor.com> in private!
    "Unix gives you enough rope to shoot yourself in the foot."
    http://www.zytor.com/~hpa/puzzle.txt
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