Mon, 16 Jul 2007
Well, not really abuse, but a clever hack of a HTTP
header. While looking for information
about new "polyinstantiated directories" feature I have found the
namespace.conf(5) manpage on some web site.
The URL is
http://linux.die.net/man/5/namespace.conf, and it looks as an ordinary
page. However, when you do a Google search for
polyinstantiated directories and follow the link to
(today it was in the middle of the search results page),
the searched keywords get highlighted.
This cool hack aside, the subject itself (polyinstantiated directories)
is interesting on its own. It seems that the support for this has been
in the kernel for a while (check whether your
in fact a symlink to
/proc/self/mounts), the user-space
(Fedora rawhide) now supports it via the
pam_namespace PAM module.
Further reading on this topic include the SAGE-2006 talk by Russel Coker, and the
Documentation/sharedsubtree.txt file from the kernel sources.