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    SubjectRe: CLONE_NEWNS and bind mounts to make "chroot" jail
    Date
    From
    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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