Quoting Eric W. Biederman (ebiederm@xxxxxxxxxxxx): > "Serge E. Hallyn" <serge@xxxxxxxxxx> writes: > > > Quoting Serge E. Hallyn (serge@xxxxxxxxxx): > >> Quoting Eric W. Biederman (ebiederm@xxxxxxxxxxxx): > >> > > >> > Serge does this patch break lxc? I think all should be well but I want > >> > to make certain there is not some hidden case where this fundamentaly > >> > breaks some functionality. > >> > >> I haven't yet tried. I'll build and test a kernel today. I'm pretty > >> sure all the child's mounts are done after clone, so I *think* the worst > >> case will be that the unmounting of put_old after pivot_root() will > >> be noisy. Will let you know. > >> > >> -serge > > > > Just tested it - works fine. Warns about all of the failed umounts. > > Just to confirm. Can you do a lazy umount of put_old and get rid of > them? Yes, it does that and it works. > > Acked-by: Serge Hallyn <serge.hallyn@xxxxxxxxxxxxx> > > > > ( Mind you I'm not approving of the idea of hiding mounts as a security > > mechanisms, but I know that neither are you :) > > As a security mechanism, not really. This is more about closing a > theoretical hole in case someone was sloppy, and doing it before user > namespaces are too widely deployed so we avoid massive user space > breakage. It let's me sleep more soundly at night if I know you can't > more access more with user namespaces that you can without user > namespaces. Yup. thanks, -serge -- 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
