HP-LX 1.0 Secure Linux

kengreenebaum writes: "Webtechniques has a short but interesting article on HP's approach to a secure but expensive LINUX distro. Basically they started with RedHat 7.1 and added compartments; an extension to the age-old chroot jail concept where the processes representing major services run. Kernel extensions allow HP (or the administrator) to specify which compartments can access which kernel resources including individual files, network stacks, and each other. HP has Technical Product Brief as well as other material online. Interesting to compare HP's approach to that of the NSA's Secure Linux projects. These concepts sound like a solid way to prevent buffer overflow type security holes in individual services from compromising the entire machine. At $3000 HP-LX is too expensive for many to experiment with but the NSA's code seems to be more readily available. Anybody have experience with these distributions or with similar approaches to Linux security?"