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User-Mode-Linux Architecture, A Linux kernel consists of a large generic part that is hardware-independent, plus certain components that are matched towards a specific processor architecture, e.g. the Intel i386 hardware platform. The versions of the UML kernel and the host kernel do not have to be the same. Thus it is possible to run a Linux-2.6-based UML kernel on top of a Linux-2.4 host kernel or vice versa. Each virtual host instance can run even with its individual UML kernel version. Through the introduction of the Separate Kernel Address Space (SKAS) mode, the UML kernel now runs in an entirely different host address space from its processes.This solves the security and honey pot fingerprinting problems by making the UML kernel totally inaccessible to UML processes. SKAS mode requires that a patch must be applied to the host kernel. This patch implements the address space support needed by SKAS mode. Each UML instance uses a root file system of its own that resides as a single large file on the hard disk of the host system. The complete Linux file system contains all required system commands and application programs as well as a sufficient amount of free space to store user data. Default UML Network Topology Figure 4 shows the default UML network topology created for the strongSwan testing environment. It consists of the eight virtual hosts alice, venus, moon, carol, winnetou, dave, sun, and bob, populating the three separate subnets of the VPN scenario already presented in figure 1, plus three tun/tap devices that connect the host with each of the UML instances via the UML switches sitting at the center of the corresponding sub-networks.
Tags : kernel address space, user mode linux, host kernel, honey pot, intel i386, kernel version, linux kernel, network simulation, linux file system, processor architecture, space support, network topology, virtual hosts, winnetou, host system
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