Re: Question about /dev/mem and /dev/kmem

[Jim Nelson]

Wichert Akkerman wrote:
> Previously Jim Nelson wrote:
>
> > I was looking at some articles about rootkits on monolithic kernels, and 
> > had a thought.  Would a kernel config option to disable write access to 
> > /dev/mem and /dev/kmem be a workable idea?
>
>
> Yes, but not a very useful one since it is an incomplete solution. You
> can easily do something better using /proc/kernel/cap-bound

Isn't that /proc/sys/kernel/cap-bound?

> (like writing 0xFFFCFFFF into it).

And what stops an attacker who's already gained root from doing a "cat "0" > 
/proc/sys/kernel/cap-bound" ?

> Wichert.

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