Re: Kernel stack for a process

["Nagaraj" <nagaraj@smartyantra.com>]

> No, you could not crash the kernel this way. Your
> userland program would be the one traversing the symlinks,
> in -user space-. Each call into the kernel would
> traverse one link, sure, but that's certainly not
> going to be a problem for the kernel.
> 

plz have a look at: 
http://lwn.net/Articles/2995/

I think user process can still do it.


> I also suspect (though I do not know this for certain)
> that the kernel is smart enough to detect kernel-stack
> overflow and kill the offending process. It would be
> trivial: just keep a read-only PTE at the end of the
> kernel stack, and if anything tries to write
> there, take a page fault, notice that it's adjacent
> to the task stack, and kill the process.

http://van-dijk.net/linuxkernel/200206/1235.html
By reading that, i think it wont ! ( i may be wrong here )
I donno abt latest kernels.

ive not yet found the light :(

-nagaraj


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