The Linux/Unix SysAdmin Covert File Storage Method Number 57

Feb 04, 2009, 19:33 (1 Talkback[s])
(Other stories by Mike Tremell)

[ Thanks to Mike Golvach for this link. ]

"You may recall a post we did a long long time ago, in a galaxy just down the block, regarding finding space hogs on multiple overlay-mounted filesystems. This little way to hide bits of information works relatively along the same lines. The one serious limitation it has is that, while you'll be secretly storing your information, you won't be hiding the actual disk space it consumes, so this method of packing away all the stuff you're not supposed to have on the company's production web server has its limitations.

"For today, we'll use a /usr/local mount point that we have on a Solaris machine (independent of the /usr mount point) to demonstrate.

"Step 1: Take a lay of the land. In order for this to work, you need to have enough space to stow away what you need to and, hopefully, enough space to make your addition barely noticeable. Our setup isn't bad, especially since the "actual" filesystem that's going to be impacted will be the /usr filesystem underneath /usr/local (If it were /usr/local, the change might be noticed since the filesystem is so "empty")"

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