[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.
Peter
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This archive was generated by hypermail 2b29 : Thu Nov 23 2000 - 21:00:12 EST