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SubjectRe: CLONE_NEWNS and bind mounts to make "chroot" jail
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I'm not 100% sure if this is what you meant, but I did get the following
to work:

chdir("/jail");
unshare(CLONE_NEWNS);
mount("/jail", "/jail", NULL, MS_BIND, NULL);
pivot_root("/jail", "/jail/old_root");
chdir("/");
mount("/old_root/bin", "bin", NULL, MS_BIND, NULL);
mount("/old_root/usr", "usr", NULL, MS_BIND, NULL);
mount("/old_root/lib", "lib", NULL, MS_BIND, NULL);
umount2("/old_root", MNT_DETACH);
exec("/busybox");
Thanks for the help.

On Tue, 2008-03-04 at 15:45 -0600, serge@hallyn.com wrote:
> Quoting Leibowitz, Michael (michael.leibowitz@intel.com):
> Yes, you
> cd /jail
> mount --bind /jail /jail
> pivot_root . old_root
>
> but . is now mounted over.
> > char *newargv[]= { "sh", NULL };
> >
> > chdir("/jail");
> > unshare(CLONE_NEWNS));
> > mount("/jail", "/jail", NULL, MS_BIND, NULL));
> > mount("/bin", "bin", NULL, MS_BIND, NULL));
> > mount("/usr", "usr", NULL, MS_BIND, NULL));
> > mount("/lib", "lib", NULL, MS_BIND, NULL));
> > if (pivot_root(".", "old_root")) perror("pivot_root . old_root");
> > exec("./bash-static"); /* copied to /jail prior to running */

--
Michael Leibowitz <michael.leibowitz@intel.com>
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