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11
votes
3answers
1k views

Why would someone want to run UserMode Linux (UML)

The Linux README states that: Linux has also been ported to itself. You can now run the kernel as a userspace application - this is called UserMode Linux (UML). Why would someone want to do ...
3
votes
1answer
543 views

Not able to change default group for user with `sudo usermod -g` [duplicate]

I have looked at the questions and answer here at U&L but I still cannot get my default group to change from a user. [red@ws-red-l ~]$ whoami red [red@ws-red-l ~]$ groups yellow green ...
3
votes
1answer
944 views

How can a user run a program in kernel mode?

Is it possible for a user to run their own program in kernel mode? How could a user accomplish this? What weakness in the system's protection mechanism would they have to bypass? I'm thinking that a ...
0
votes
1answer
41 views

Configure UML to generate core file

The User Mode Linux (UML) I run on Ubuntu crashes occasionally, but does not generate any core file. I'd like to know the necessary configuration to be applied on UML so it generates a core when it ...
3
votes
1answer
353 views

How to create rootfs for user mode Linux on Fedora 18?

I want to create a rootfs to be used with an UML kernel and be able to use the internet. I was using febootstrap with packages: bash, coreutils, net-tools, iputils. After using ...
4
votes
1answer
141 views

User Mode Linux compile fails

I am trying to compile User Mode Linux on a 64 bit machine with defconfig and getting the following error. arch/x86/um/user-offsets.c:1: sorry, unimplemented: code model "large" not supported yet ...