Re: no deprecation of /usr as a standalone filesystem
On Mon, Jun 01, 2009 at 03:08:02PM -0300, Henrique de Moraes Holschuh wrote:
> On Mon, 01 Jun 2009, Pierre Habouzit wrote:
> > Think again, if I do such a package, I would obviously check with some
> > kind of trivial perl programm if the device containing /usr/lib/rootkit
> > is mounted with nodev, would use mount -o remount,dev on the problematic
> > mount point in the preinst, let the unpacking happen, and remount
> > properly in the postinst.
> AFAIK, nodev blocks device nodes from _WORKING_ as well.
> Anyway, one would need to just remount it "dev" as root to exploit.
> Of course, when you have el-crap-o pathbased security plus something locking
> down remounts, the above is an attack vector that separate /usr could close.
> Not something someone using SE Linux would need to care about, though.
> > And if you really care about those extra bits of performance, then what
> > I'd do is _not_ to not encrypt /usr but rather to let / be unencrypted,
> And now you need /etc as a separate partition, which is a lot worse to pull
> off than /usr as a separate partition...
cat >> /etc/fstab
/srv/localhost/etc / auto bind
·O· Pierre Habouzit