On Mon, Jan 30, 2012 at 3:10 PM, Colin Walters <walters@xxxxxxxxxx> wrote: > On Mon, 2012-01-30 at 14:43 -0800, Andy Lutomirski wrote: > >> You don't need a setuid binary. Just have an initscript set up the bind mounts. > > The point is that dchroot is already setuid root, and calls chroot, so > it gains nothing from the ability to do it unprivileged. > > (And wow, I just looked at the source, it's a setuid C++ binary! Using > boost. Ugh...) Exactly! You can accomplish the same thing *without a scary setuid binary*. The use case doesn't even need a new complicated userspace tool. You would set up an initscript or some /etc/fstab entries and then: no_new_privs chroot /var/chroot/ubuntu_oneiric/ /bin/bash et voila. (Where no_new_privs would be a really simple tool that does PR_SET_NO_NEW_PRIVS and then execs its argument.) Maybe it's just me, but I think this is useful and I would, in fact, use it in my regular workflow. --Andy -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
