Hi Prabhu, On Tue, Oct 26, 2010 at 9:39 PM, Prabhu nath <[email protected]> wrote: > Thanks a lot for the clarification. > Is that not a big hole that the kernel provides ?. If I have a root access, > then I can spoil the whole system.
There are many ways to "spoil" the whole system if you have root access. The root user can load a module, which has direct access to all of the same stuff. If you want to "close" this hole, you can simply turn off the /dev/mem driver. > Is there any motive for the kernel to support this ? I use it for debugging. In embedded systems, you can use it to access registers directly from user space, which is sometimes useful when you don't want to write a whole driver just to tweak a register. It can also be bad to tweak registers this way, so you need to be aware of the issues. -- Dave Hylands Shuswap, BC, Canada http://www.DaveHylands.com/ -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to [email protected] Please read the FAQ at http://kernelnewbies.org/FAQ
