Just out of curiosity, Linux's kernel stack is one page. Where in the
kernel source code that says that we can have two pages instead of one
page kernel stack?
-Zhihui
On Mon, 23 Jul 2001, Eugene L. Vorokov wrote:
> > > I call this function with (curproc, PATH_MAX+1), and everything is fine
> > > when I have just a few local variables defined in the caller (it all
> > > works on MOD_LOAD only). However, if I have 2 buffers, 4096 bytes each,
> > > as local variables and then try to allocate userspace memory the same
> > > way, kernel crashes - sometimes inside mmap(), sometimes a bit later.
> > >
> > > Why could this happen ? Is it related to possible stack overflow ?
> >
> > Yes. The kernel stack is only two pages; you absolutely must not use
> > large local variables in the kernel.
>
> I see. But I still can define them using "static", right ?
>
> Regards,
> Eugene
>
>
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