Hi, while debugging a 9P2000 file server I realized that it's very easy to hide file or folders in Plan 9: just don't include them in the Rreads of the parent directory.
Given the protocol, I know I'm stating the obvious, but the effect still surprises me. Such files/folder would be accessible to programs knowing their exact names but not visible to the poor user who ignore them. I wonder if this can be turned to a security issue. Eg an invisible pipe named "null" and bound before to /dev could receive top secret data you wanted to destroy. Giacomo PS: knowing a program that use these hidden files, /proc/n/fd would still reveal their path, but the path could still appear legitimate like the case of /dev/null.
