On Tuesday 24 May 2005 01:16, jhoney jhoney wrote: > Hello All, > > When application runs ,it can not access the kernel memory but when the module for the corresponding application runs in kernel mode , it has access to kernel memory. A module doesn't run (as an independent entity like a process). A modules is just code that is dynamically loaded into the kernel. > My question is what made to access the kernel memory module which could not be done by an application. The CPU, the MMU,... A normal process runs in a non-privileged mode. The CPU will not let it run certain instructions. When an interrupt is received, the CPU will switch to a privileged mode and jump to the interrupt handler. This is true even for software interrupts that system calls generate. -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
