[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Ring 0 Protection ?

HI all,

When a processor is in ring 0 (privilidged mode in x86),
what can the program now do that it couldn't before ?

which accesses are blocked by the processor if it is in ring 3 ?
(I know that every interrupt has a minimum cpu priviledge needed,
but I hardly assume programs are so "eager" to call interrupts, are they ?
what other things aren't allowed ?)

where can we see relevant code in the kernel ?

thanks
George

--
Kernelnewbies: Help each other learn about the Linux kernel.
Archive:       http://mail.nl.linux.org/kernelnewbies/
FAQ:           http://kernelnewbies.org/faq/