Messages in this thread |  | | Date | Fri, 21 Feb 2003 14:25:30 -0500 (EST) | From | "Richard B. Johnson" <> | Subject | Re: A question on kernel stack |
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On Fri, 21 Feb 2003, nataraja kumar wrote:
> hi, > my apologies if i am wrong. please let me know > why does kernel use kernel stack when process jumps > from user mode to kernel mode. why can't user stack > be used ? > > nattu.
Because if a user-stack was used, any user could crash the kernel and take down the system.
main() { __asm__ __volatile__("movl $0x08, %esp\n"); /* Only enough stack to push 0 and call exit() */
exit(0); /* Ultimately a sys-call */ }
Cheers, Dick Johnson Penguin : Linux version 2.4.18 on an i686 machine (797.90 BogoMips). Why is the government concerned about the lunatic fringe? Think about it.
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