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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.

<> at work, <> in private!
"Unix gives you enough rope to shoot yourself in the foot."
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