Hi all,

I am trying to prevent Linux from using some x86 peripherals. For instance, I want to prevent Linux from using the PCI and the serial port 1. Do you have any idea on how to achieve this?

I though that an idea might be to edit the Linux GDT and exclude the I/O port and memory mapped locations of the peripherals I don't want it to have access to, but this will lead to a non flat model which is what Linux assumes.

Any thoughts would be much appreciated.

Hi,

Compile kernel and disable the drivers for PCI.Serial etc.

You can also remove the modules using rmmod or modprobe -r

Hi and thanks for your response. Unfortunately what I intent to achieve is not getting solved by just removing the drivers from the kernel. For example, a user can write a user-process or a module by which he/she accesses the I/O ports of e.g. the serial. So, access to the registers of the serial will be achieved despite the lack of a serial driver.

What I want is that every one that tries to access some particular I/O ports (e.g. 3F8h – 3FFh for serial port 1) and some particular addresses of memory mapped peripherals (e.g. PCI), not be able to do it.

I hope it is clearer now what I want to achieve.

Thanks.

Why can't a user can write a user-process or a module by which he/she for any thing else we do ( if we prevent one that tries to access some particular I/O ports (e.g. 3F8h – 3FFh for serial port 1) and some particular addresses of memory mapped peripherals (e.g. PCI), not be able to do it. some how?)

Excuse me but I find it difficult to follow you thought...

what if you load the drivers for those devices and then start a process that uses the devices... will that not effectively block a user from accessing the said device because it is already busy?

or what if you chmod the users out of the devices you dont want them to use?

-Christopher

Hi! I would like just to prevent the access to some particular memory locations if that's possible. For example, I want Linux not being able to see particular locations.

Thanks.